СПОСОБ ПОЛУЧЕНИЯ ОБЪЕКТОВ ИЗ БИОСОВМЕСТИМОГО ГИДРОГЕЛЯ ДЛЯ ПРИМЕНЕНИЯ В ОБЛАСТИ МЕДИЦИНЫ, В ЧАСТНОСТИ В ОФТАЛЬМОЛОГИИ

Изобретение относится к способу получения объекта из биосовместимого гидрогеля путем отливки раствора полимера в шаблоне. Способ включает следующие этапы: (i) приготовление раствора полимера путем растворения сополимера акрилонитрила и олефиново-ненасыщенного сомономера, содержащего анионные группы, в апротонном растворителе, необязательно в присутствии осадителя, (ii) формование и начало превращения в гель раствора полимера, полученного на этапе (i), в шаблоне, состоящем из материала, содержащего указанный осадитель, или из материала, проницаемого для указанного осадителя, (iii) в ходе формирования геля погружение объекта, полученного на этапе (ii), в осадитель. Изобретение относится также к объектам из биосовместимого гидрогеля, полученным этим способом. Изобретение обеспечивает получение объектов из биосовместимого гидрогеля с улучшенными оптическими, физико-химическими и биологическими свойствами, и имеющих отличную стабильность размеров. 2 н. и 15 з.п. ф-лы, 1 табл., 1 пр.

Способ очистки загрязненного полиэтилена

В изобретении описан способ очистки регенерированного полиэтилена, например полиэтилена, регенерированного после бытового использования или после промышленного использования. Способ включает получение регенерированного полиэтилена и приведение его в контакт с первым жидким растворителем при повышенной температуре и давлении с получением экстрагированного регенерированного полиэтилена. Экстрагированный регенерированный полиэтилен растворяют в растворителе, выбранном из группы, состоящей из первого жидкого растворителя, второго жидкого растворителя или их смесей при повышенной температуре и давлении. Получают раствор полиэтилена и осуществляют очистку при повышенной температуре и давлении посредством контакта раствора полиэтилена с твердой средой, чтобы получить более чистый раствор полиэтилена. Затем от более чистого раствора полиэтилена отделяют более чистый полиэтилен. Первый и второй жидкие растворители имеют тот же или другой химический состав и выбирают из группы, состоящей из алифатических ...

НЕПРЕРЫВНЫЙ СПОСОБ ПОЛУЧЕНИЯ ВОДОАБСОРБИРУЮЩИХ ПОЛИМЕРОВ

... 1. Способ получения частиц абсорбирующего воду полимера, включающий в себя стадии(i) получения водного раствора мономера, содержащего по меньшей мере частично нейтрализованные моноэтиленненасыщенные мономеры, несущие группы (α1) карбоновой кислоты, и по меньшей мере один сшивающий агент (α3);(ii) необязательного добавления мелких частиц водоабсорбирующего полимера или водных растворов солей к водному раствору мономера;(iii) добавления к водному раствору мономеров инициатора полимеризации или по меньшей мере одного компонента системы инициаторов полимеризации, которая содержит два или более компонента;(iv) понижения содержания кислорода водного раствора мономеров;(v) загрузки водного раствора мономеров в реактор-полимеризатор;(vi) полимеризации мономеров в водном растворе мономеров в реакторе-полимеризаторе;(vii) выгрузки стренги полимерного геля из реактора-полимеризатора и необязательного измельчения полимерного геля с получением таким образом частиц полимерного геля;(viii) высушивания ...

СПОСОБ ОЧИСТКИ РЕГЕНЕРИРОВАННЫХ ПОЛИМЕРОВ

Изобретение относится к способу очистки загрязненных полимеров с использованием растворителя под давлением и твердых сред. Способ очистки регенерированного полимера, например полимера, регенерированного после бытового использования или после промышленного использования, включает получение регенерированного полимера и приведение его в контакт с жидким растворителем при повышенной температуре и давлении с получением экстрагированного регенерированного полимера. Экстрагированный регенерированный полимер растворяют в растворителе при повышенной температуре и давлении с получением раствора, содержащего полимер и взвешенные загрязняющие примеси. После отстаивания раствор проходит очистку при повышенной температуре и давлении посредством контакта раствора полимера с твердой средой с получением более чистого раствор полимера. Затем отделяют более чистый полимер от раствора. Обеспечивается получение очищенного полимера, по существу не имеющего цвета и запаха. 14 з.п. ф-лы, 5 ил., 1 табл., 4 пр.

Herstellungsverfahren mikroskopisch feiner, gefärbter Teilchen und elektrophotographische Toner die die Teilchen umfassen

Verfahren zur Herstellung wasserabsorbierender Polymere

Die Erfindung betrifft ein Verfahren zur Herstellung wasserabsorbierender Polymere durch Polymerisation einer Monomerlösung und Trocknung des erhaltenen Hydrogels mittels eines erwärmten Gasstromes, wobei DOLLAR A - die Trocknung in mindestens zwei Temperaturzonen durchgeführt wird und/oder DOLLAR A - der Gasstrom das Hydrogel im vorderen Abschnitt eines Bandtrockners von unten und im hinteren Abschnitt des Bandtrockners von oben anströmt, wobei die Strömungsumkehr bei einem Wassergehalt des Hydrogels von 15 bis 45 Gew.-% stattfindet und/oder DOLLAR A - die Hydrogelschicht in einem Bandtrockner zumindest teilweise von unten angeströmt wird, wobei die Gasgeschwindigkeit von 5 bis 30% der Gasgeschwindigkeit beträgt, die notwendig ist, um das Hydrogel vom Band zu lösen, DOLLAR A eine Vorrichtung zur Durchführung des Verfahrens sowie die Verwendung der nach dem Verfahren hergestellten wasserabsorbierenden Polymere zur Herstellung von Hygieneartikeln.

Verfahren zur Herstellung wasserabsorbierender Polymerpartikel

Verfahren zur Herstellung wasserabsorbierender Polymerpartikel, umfassend die Schritte DOLLAR A i) Trocknung eines Hydrogels, DOLLAR A ii) Abtrennung unvollständig getrockneter Polymerpartikel aus dem getrockneten Hydrogel und DOLLAR A iii) Trocknung der abgetrennten unvollständig getrockneten Polymerpartikel, DOLLAR A wobei die abgetrennten unvollständig getrockneten Polymerpartikel vor der Trocknung iii) zerkleinert werden.

Method for producing saponifield ethylene-vinyl acetate copolymer

CLEANING METHOD FOR ALKOXYSTYROLPOLYMERE

WASCHVERFAHREN ZUR REINIGUNG VON N-BZW. AMINO- ODER AMMONIUMGRUPPEN HALTIGEN POLYMEREN

PROCEDURE FOR DEGASSING A POLYMER OF AN AROMATIC ONE ALKYLENS

PROCEDURE FOR THE CLEANING AND DRYING PROCESS OF POLYMER HYDRAULIC GELS

PROCEDURE FOR THE PRODUCTION OF WATER-ABSORBING POLYMERS

PROCEDURE FOR the CONTINUOUS DRYING PROCESS OF n AND/OR AMINO, AMMONIUM OR SPIROBICYCLI GROUPS OF AMMONIUM of HALTIGEN POLYMERS

PROCEDURE FOR the PRODUCTION OF ALKYLATED n AND/OR AMINO, AMMONIUM OR SPIROBICYCLI GROUPS OF AMMONIUM of HALTIGEN, INTERLACED POLYMERS

PROCEDURE FOR THE IMPROVEMENT OF THE WATER ABSORPTION CAPACITY OF INTERLACED ONES, WATER-SOURCECASH POLYMERS.

PROCEDURE FOR THE CLEANING OF POLYVINYL ALCOHOL

PROCESS FPR PURIFICATION OF ALKOXYSTYRENE POLYMERS

Polymers derived from 4-acyloxystyrene are purified by fractionalization plus heating and cooling of the polymers in alcoholic solvents.

METHOD FOR PURIFYING CONTAMINATED POLYPROPYLENE

A method for purifying reclaimed polypropylene, such as a polypropylene reclaimed from post-consumer use or post-industrial use, is disclosed. The method involves obtaining the reclaimed polypropylene and contacting it at an elevated temperature and pressure with a fluid solvent to produce an extracted reclaimed polypropylene. The extracted reclaimed polypropylene is dissolved in a solvent at an elevated temperature and pressure to produce a polypropylene solution, which is purified at an elevated temperature and pressure by contacting the polypropylene solution with solid media to produce a purer polypropylene solution. A purer polypropylene is then separated from the purer polypropylene solution.

METHOD FOR PURIFYING CONTAMINATED POLYMERS

A method for purifying a reclaimed polymer, such as a polymer reclaimed from post-consumer use or post-industrial use, is disclosed. The method involves obtaining the reclaimed polymer and dissolving it in a solvent at an elevated temperature and pressure to produce a polymer solution, which is purified at an elevated temperature and pressure by contacting the polymer solution with solid media to produce a purer polymer solution. A purer polymer is then separated from the purer polymer solution.

DEWATERING AGENTS FOR POLYMER SLURRIES

The present invention is a method for dewatering a wet, particulate polymer mass. The method of the present invention includes several steps, one of which is adding a surface active macromolecule to a wet, particulate polymer mass. The polymer mass is thereafter subjected to a mechanical dewatering procedure. Typically, these mechanical dewatering procedures include filtration, centrifugation, coagulation, and thermal drying. The surface active macromolecules of the present invention have been useful in reducing the moisture content of various wet, particulate polymer masses. The surface active macromolecules of the present invention alter the water function characteristics of the wet, particulate polymer mass, and thereby facilitate the dewatering of the polymer mass. The compounds of the present invention are effective at low concentrations of from about 7.5 to 300 ppm.

SOLID STATE DEVOLATILIZATION OF SYNDIOTACTIC VINYL AROMATIC POLYMERS WITH CATALYST DEACTIVATION

The present invention is an improved solid state polymer devolatilization process which comprises heating a wet feed mixture comprising polymer, residual monomer(s), process solvents and active catalyst residues in the presence of an inert gas, wherein the improvement comprises replacing the inert gas with a catalyst desactivating gas.

REPEATED PROCESSING OF PARTICLES ZAVYShENNOGO SIZE PRODUCTION OF VODOABSORBIRUYuShchIKh POLYMER PARTICLES

PRODUCTION OF MONOMER WITH EXCESS NEUTRALIZATION FOR PRODUCTION OF VODOABSORBIRUYuShchIKh POLYMER PARTICLES

СПОСОБ СУШКИ ВЛАЖНОГО ПОЛИМЕРА

Способ сушки влажного полимера, предусматривающий стадию сушки, проводимую в сушилке, содержащей по меньшей мере один нагревательный элемент, внутри которого течет теплопередающая текучая среда, причем указанной теплопередающей текучей средой является пар низкого давления.

MUCH STADIINOE GRINDING PRODUCTION OF VODOABSORBIRUYuShchIKh POLYMER PARTICLES

SUPER ABSORBENT POLYMER

A PROCESS FOR PRODUCING SURFACE-POSTCROSSLINKED WATER-ABSORBENT POLYMER PARTICLES

불용성 겔을 함유하지 않고 낮은 수준의 잔류 모노머를 함유한 수용성 폴리머를 제조하는 방법

... 본 발명은 습윤 겔 폴리머를 건조 폴리머 합성 작업의 건조 단계로 연속적으로 공급하기 위한 방법 및 장치를 제공한다. 내부 챔버를 통해 모노머 및 다른 시약을 공급하여 습윤 겔 폴리머로 중합시키는 내부 챔버를 구비한 다수의 피스톤이 배열된다. 각 피스톤은 하나의 피스톤이 건조 단계로 폴리머를 압출시키는 것을 완료할 때에 제2 피스톤이 다른 폴리머의 중합을 완료하고 중단 없이 다른 폴리머를 연속적으로 공급할 수 있도록 조정된 스케쥴에 따라 작동한다. 완료된 후에, 다음에 필요할 때에 다시 준비하기 위해 다른 시약들이 재-공급된다. 결과적으로, 이를 달성하기 위한 종래 시도에서 문제가 되는 오염 및 불순물 문제없이 비용 효율적인 연속 공급이 달성될 수 있다.

process for preparing water-absorbing polymeric particles

METHOD FOR MANUFACTURING A WATER-ABSORBING RESIN

The disclosed continuous manufacturing method for a water-absorbing resin includes a plurality of connected continuous steps. Said method includes: a polymerization step in which an unsaturated monomer in an aqueous solution is polymerized; a drying step in which a water-containing cross-linked granular polymer gel, obtained in a microgranulation step during or after polymerization, is dried; a post-drying pulverization step; a post-drying sorting step; and a surface-treatment step, after the sorting step, in which a water-absorbing resin powder is subjected to a surface treatment. Said method is characterized in that, with some of the above steps kept running, the other steps are halted, and subsequently all steps are restarted.

METHOD FOR PRODUCING WATER-ABSORBENT POLYMER PARTICLES

A method is disclosed for producing water-absorbent polymer particles, wherein a product stream which contains water-absorbent polymer particles is examined for non-ferritic metal contaminants using an eddy current detector.

WATER-ABSORBING POLYMER STRUCTURE WITH IMPROVED COLOR STABILITY

The present invention relates to a method for the production of water-absorbing polymer structures, having the following method steps: I) provision of an aqueous monomer solution containing a polymerizable, monoethylenically unsaturated monomer (α1) having an acid group, or a salt of said monomer, optionally a monoethylenically unsaturated monomer (α2) which can polymerize with the monomer (α1), and optionally a cross linking agent (α3), ii) radical polymerization of the aqueous monomer solution, giving a polymer gel, iii) optionally pulverization of the polymer gel, iv) drying the optionally pulverized polymer gel, giving a water-absorbing polymer structure, v) optionally milling and sieving the water-absorbing polymer structure, and vi) surface cross linking of the optionally milled and sieved water-absorbing polymer structure, wherein a reducing agent containing a sulfonate, a salt of a sulfonate, or a mixture of a sulfonate and a salt of a sulfonate is added to I) the water-absorbing ...

Apparatus for eliminating residual solvent from crumbled polymer

The apparatus proposed herein relates to mass-exchange apparatus for isolating polymers from hydrocarbon solutions. The apparatus comprises a vertical column provided with a device for producing polymer crumb and an aqueous suspension, a device for feeding live steam, and contact trays which divide the column into compartments as for height. The device for producing polymer crumb and aqueous suspension is accommodated in the top portion of the vertical column and is essentially a chamber established on at least one side by the overflow baffle. The chamber accommodates the water supply nozzle and a conventional injector-type polymer crumb former. Such an arrangement of the device for polymer crumb formation and producing aqueous suspension results in a simplified construction of the entire apparatus and diminished overall dimensions thereof, as well as to a simpler attendance of the apparatus.

Process for drying polymeric beads and associating shading pigments therewith

A process for drying a water-wet paste containing polymeric beads without agglomeration is disclosed in which there is added to the wet paste a proportion of an organic solvent which forms an azeotrope with water, such as methyl isobutyl ketone, in an amount providing a stirrable mixture, and the solvent-containing aqueous paste is heated to remove the water as an azeotrope with the solvent and to produce a water free suspension of the beads in organic solvent. The proportion of azeotropic solvent can be minimized by adding a resinous vehicle in organic solvent solution to the solvent-containing aqueous paste after substantially all the water has been removed, and continuing the application of heat to remove undesired organic solvent and thereby increase the solids content. As a feature of the invention, a pigment which is incompatible with the azeotropic solvent, such as an aqueous dispersion of lamp black, is added to the aqueous paste either before or after the addition of azeotropic ...

PROCESS FOR WASHING POWDERY AND/OR GRANULAR RESINS AND A WASHING DEVICE THEREFOR

Process for production of water-absorbing resin particles, water-absorbing resin particles, water-stopping material, and absorbent article

The present invention provides a method for producing water-absorbing resin particles having high equilibrium swelling capacity, a high water-absorption rate or high initial swelling capacity, and an appropriate particle size that achieves good handling performance; water-absorbing resin particles obtained by the method; and a water blocking material and an absorbent article which include the water-absorbing resin particles. The present invention is a method for producing water-absorbing resin particles, which comprises: preparing a hydrogel polymer by reversed-phase suspension polymerization of a water-soluble ethylenically unsaturated monomer in a hydrocarbon solvent in the absence of an internal crosslinking agent but in the presence of a surfactant with an HLB of 8 to 12; carrying out a post-crosslinking reaction of the hydrogel polymer whose moisture content is adjusted to 30 to 110 mass % based on a water-soluble ethylenically unsaturated monomer component that composes the hydrogel ...

Method for Preparing Super Absorbent Polymer

The method for preparing a super absorbent polymer according to the present disclosure reduces the generating amount of a fine powder while realizing the same particle size distribution in the process of pulverizing the dried polymer, thereby reducing the load of the fine powder reassembly, drying, pulverizing and classifying steps.

PROCESS FOR PRODUCING WATER-ABSORBING RESIN

A method for producing a water-absorbent resin includes a polymerization step of polymerizing a polymerizable component containing a water-soluble ethylenically unsaturated monomer dissolved in water using a water-soluble azo-type radical polymerization initiator to obtain a reaction system including a water-absorbent resin precursor, and a dehydration step of removing water from the reaction system by heating. In the dehydration step, a water-soluble radical polymerization initiator is added to the reaction system at any first dehydration stage when the residual water rate calculated by the formula (1) is 50% or more, and a reducing substance is added to the reaction system at any second dehydration stage when the residual water rate decreases from that at the first dehydration stage by 10% or more. According to this production method, a water-absorbent resin having satisfactory water-absorption capacity can be produced while suppressing the content of residual monomers.

Verfahren zur Herstellung von Polymeren ausgehend von N-Vinylacetamid-Monomeren

Verfahren zur Verbesserung der Wasseraufnahmekapazität von vernetzten, wasserquellbaren Polymeren.

VERFAHREN ZUR HERSTELLUNG SUPERABSORBIERENDER POLYMERE

WASCHVERFAHREN FOR the CLEANING OF n AND/OR AMINO, AMMONIUM OR SPIROBICYCLI GROUPS OF AMMONIUM of HALTIGEN POLYMERS

PROCEDURE FOR CLEANING AND DRYING POLYMER HYDRAULIC GELS

PROCEDURE FOR THE PRODUCTION OF ALKYLATED NBZW. AMINO, AMMONIUMODER SPIROBICYCLI GROUPS OF AMMONIUM OF HALTIGEN, INTERLACED POLYMERS

PROCEDURE FOR THE PRODUCTION OF WATER-ABSORBING POLYMER PARTICLES

IMPROVED INSOLUBLE VINYL LACTAM CLARIFIERS

IMPROVED INSOLUBLE VINYL LACTAM CLARIFIERS

Method for drying water-containing styrol polymerizates

Process for producing aqueous polyacrylamide solutions

Process for producing aqueous polyacrylamide solutions by polymerizing an aqueous solution comprising at least acrylamide thereby obtaining an aqueous polyacrylamide gel and dissolving said aqueous polyacrylamide gel in water, wherein the process is carried out in a modular, relocatable plant. The plant preferably is deployed at a location at which aqueous polyacrylamide solutions are used, for example on an oilfield or in a mining area.

DRYING AND REMOVING RESIDUAL ACID FROM HALOGENATED POLYMER RESINS

Moist halogenated resins separated from an aqueous acid suspension of said resins are dried and stripped of residual acid with a heated inert drying gas. The resins are not washed to lower residual acid or treated with a base compound to neutralize residual acid before drying begins. Inert drying gases include nitrogen, helium, argon and the like. The dried resin has low residual acid and moisture levels. It is white and free of visually detectable areas of discoloration. It also has high thermal stability, particularly when admixed with minor amounts of a thermal stabilizer such as calcium stearate. 35,000-F ...

ELASTOMER EXTRUSION DRYING WITH GAS INJECTION

Extrusion drying of wet rubber crumb particles in the last phase of the overall elastomer drying process is improved through use of gas injected into the compression zone of an extruder thereby providing an improved effeciency in the explosion drying process. Rubber particles having a very low moisture content, such as less than 0.2% by weight, frequently less than 0.1%, are produced.

METHOD FOR PURIFYING CONTAMINATED POLYMERS

A method for purifying a reclaimed polymer, such as a polymer reclaimed from post-consumer use or post-industrial use, is disclosed. The method involves obtaining the reclaimed polymer and contacting it at an elevated temperature and pressure with a fluid solvent to produce an extracted reclaimed polymer. The extracted reclaimed polymer is dissolved in a solvent at an elevated temperature and pressure to produce a polymer solution. A polymer is then separated from the polymer solution.

METHOD FOR PURIFYING RECLAIMED POLYPROPYLENE

A method for purifying a reclaimed polypropylene is provided. The method involves obtaining reclaimed polypropylene, contacting it with a first fluid solvent to produce an extracted reclaimed polypropylene then dissolving the extracted reclaimed polypropylene in a solvent to produce a first solution comprising polypropylene and suspended contaminants. The first solution is settled to produce a second solution comprising polypropylene and remaining contaminants. The second solution is purified by contacting the second solution with solid media to produce a third solution comprising purer polypropylene. Finally, the purer polypropylene is separated from the third solution.

PROCESS FOR FINISHING A RESIN FROM AN EMULSION POLYMERIZED LATEX

A process for finishing latex to form a dry resin and the resulting product. The process includes coagulating a latex of a thermoplastic polymer at a temperature at or just above the agglomeration temperature of the resin, dewatering the resin slurry to form a resin cake, drying the resin cake using extrusion technology to form a resin melt and solidifying the resin melt to form the resin. Preferred processes of the invention also include finishing the resin, such as by pelletizing and/or grinding it. More preferred processes of the invention include collecting and neutralizing the aqueous liquid byproducts from the dewatering and drying steps of the process. One embodiment of the invention includes utilizing water to solidify the resin melt, pelletizing the resin and drying the pellets. Most preferred processes of the invention include recycling any aqueous liquid byproducts of the solidifying and/or pellet drying steps, and recycling dried resin that is outside of the specification back ...

ADDITIONAL TREATMENT SURFACE CROSS-LINKED VODOABSORBIRUYuShchIKh POLYMER PARTICLES WITH APPLICATION OF ADDITIVE

СПОСОБ СУШКИ ВЛАЖНОГО ПОЛИМЕРА

Заявленное изобретение относится к способу сушки влажного полимера и устройству для его осуществления. Данный способ заключается в том, что полимер сушат в сушилке, содержащей по меньшей мере один нагревательный элемент, через который протекает теплопередающая текучая среда, которая является паром под абсолютным давлением, равным или меньшим 4 бар. Устройство содержит сушилку, имеющую по меньшей мере один нагревательный элемент и средство для подачи в нагревательный элемент пара под абсолютным давлением, которое является равным или меньшим 4 бар; эжектор для отсасывания конденсатов, образованных посредством конденсации пара ниже по потоку сушилки; резервуар для сбора конденсатов, выходящих из эжектора. Данные изобретения позволяют увеличить коэффициент общей теплопередачи сушки и предотвратить застаивание полимера и порчу нагревательных элементов.

СПОСОБ СУШЕНИЯ ВЛАЖНОГО ПОЛИМЕРА

Способ сушения влажного полимера, который предусматривает стадию сушения, которую проводят в сушилке, которая содержит по меньшей мере один нагревательный элемент, внутри которого течет теплопередающая текучая среда, причем указанной теплопередающей текучей средой является пар под абсолютным давлением, какой равен или меньше 4 бар.

PRODUCTION OF VODOABSORBIRUYuShchIKh POLYMER PARTICLES WITH APPLICATION OF CARBONATE FOAMING AND BAND DRYING

SORTING SMALL PARTICLES PRODUCTION OF VODOABSORBIRUYuShchIKh POLYMER PARTICLES

Method for producing water-absorbing polymer particles

The invention relates to a method for producing water-absorbing polymer particles, in which an aqueous polymer gel is dried in a circulating air belt dryer on a continuous conveyor belt and the surface of the conveyor belt has a roughness of at least 0.9 [mu]m.

Method used for separating polymer products with ultrafine polymer disperse system taking organic phase as disperse medium

Method for preparing super-absorbent resin and super-absorbent resin prepared thereby

PROCESS OF DESICCATION OF WET PARTICLES OF COPOLYMERS HYDROLYSES Of VINYL ETHYLENE AND ACETATE

PROCESS OF DRYING AND EXTRUSION Of an ELASTOMER WITH GAS INJECTION

PROCESS OF POLYMER CHLORINES DRYING

PROCESS FOR PURIFICATION OF ALKOXYSTYRENE POLYMERS

Process for the continuous preparation of water-absorbent polymers

PRODUCING METHOD OF SUPER ABSORBENT RESIN

The present invention relates to a producing method of a super absorbent resin. The producing method of a super absorbent resin according to the present invention comprises the steps of: forming a hydrous gel phase polymer by thermal polymerization or photo-polymerization of a monomer composition comprising a water-soluble ethylene based unsaturated monomer and a polymerization initiator; drying the hydrous gel phase polymer; crushing the dried polymer; and mixing and reassembling, from the crushed polymer, fine powder having the diameter of 180 μm or less and polymer having the diameter of 300 μm or more, while adding steam. According to the present invention, it is possible to obtain a super absorbent resin having high fine powder cohesive strength. COPYRIGHT KIPO 2016 ...

온난-다습 환경에서의 저장 후의 개선된 표면을 갖는 ABS 조성물의 제조 방법

... 본 발명은, 유화 중합 방법으로 수득되고 제조-관련 염 함유물을 포함하는 비닐-방향족 공중합체를 함유하는 조성물을 제조하는 방법에 관한 것이다. 상기 조성물은 온난-다습 환경에서의 저장 후의 개선된 표면 품질을 특징으로 하며, 따라서 시간 경과 시 무결함으로 유지되는 클래스 A 표면을 갖는 성형품을 제조하는데 적합하다.

Process for the continuous preparation of water-absorbent polymers

PROCESS FOR THE CONTINUOUS DRYING OF POLYMERIC THAT CONTAINS AMINO NITROGEN OR GROUPS, AMMONIUM OR AMMONIUM ESPIROBICICLICO

Proceso para el secado de polímeros que contienen N o grupos amino, amonio o amonio espirobicíclico, que comprenden grupos catiónicos que contienen N, y contraiones apropiados, donde los polímeros gelatinizados y lavados que se obtienen por polimerización, reticulado y opcionalmente alquilación se secan de manera continua en un lecho fluidificado utilizando un medio gaseoso a presión normal o sobrepresión.

POLYACRYLIC ACID (SALT) WATER-ABSORBING RESIN AND MANUFACTURING METHOD THEREFOR

Provided is a method for manufacturing a water-absorbing resin that has excellent water-absorption performance and is made from an acrylic acid that is suitable for large-scale production of said water-absorbing resin. Said method for manufacturing a polyacrylic acid (salt) water-absorbing resin includes a prescribed monomer-preparation step, polymerization step, drying step, and surface-crosslinking step, in that order. The acetic-acid concentration of the acrylic acid and the like supplied to the monomer-preparation step is 300 to 10,000 ppm (with respect to the acrylic acid), and an acetic-acid-concentration decrease percentage defined by a given formula is at least 35%.

PURIFICATION PROCESS OF POLYMERS OF ALKOXYSTYRENE

The invention provides a novel process for purifying4-alkoxystyrene polymers by slurrying the crude polymerin methanol. After rigorous stirring, the purified polymer is removed by centrifugation, filtration or decantation. The process is repeated as long as necessary to remove by-products and low molecular weight materials.

METHOD OF DRYING A MATERIAL HAVING A COHESIVE PHASE

A method for drying a material such as a polymer hydrogel which passes through a cohesive phase as it dries is disclosed. The method comprises agitating a composition while removing liquid until the solids content of the composition reaches a level at which the composition enters a cohesive phase, halting agitation, removing liquid from the composition in the absence of agitation, and resuming agitation. Practice of the present invention can eliminate the problems associated with adhesion of a material to itself and to process equipment during the cohesive phase. Especially for crosslinked poly(allylamine).

Process for drying wet particles of hydrolyzed ethylene-vinyl acetate copolymer

Process for drying wet particles of hydrolyzed ethylene-vinyl acetate copolymer under the specific condition as follows: A. a pressure in a dryer of not more than 120 mmHg, B. a temperature of the heating surface of dryer of not more than 100° C., and C. T × θ0.6 ≦ 320, wherein T is a temperature (° C.) of the heating surface of dryer and θ is a residence time (hour) of the particles in the dryer. The thus obtained particles have excellent molding properties.

Purification means

Polymers derived from 4-acyloxystyrene are purified by fractionalization plus heating and cooling of the polymers in alcoholic solvents.

Reclaimed Polyethylene Composition

A composition is disclosed that comprises at least about 95 weight percent reclaimed polyethylene. The reclaimed polyethylene comprises less than about 10 ppm Al, less than about 200 ppm Ti, and less than about 5 ppm Zn. The reclaimed polyethylene has a contrast ratio opacity of less than about 70% and the composition is substantially free of odor.

SUPERABSORBENT POLYMER AND PREPARATION METHOD THEREOF

Provided are a superabsorbent polymer and a preparation method thereof. The superabsorbent polymer according to the present invention has excellent gel bed permeability (GBP) and suction power, thereby being usefully applied to hygiene products such as diapers.

PROCESS FOR DEVOLATILIZATION OF A POLYMER OF AN AROMATIC ALKYLENE

PROCESS FOR PREPARING WATER-ABSORBING POLYMER PARTICLES

PROCESS FOR PRODUCING WATER-ABSORBING RESIN

An ambient curable aqueous dispersion of polymer particles containing pendant ethylenically unsaturated side chains; a method of applying to a substrate a coating composition containing the aqueous dispersion of polymer particles; and a method of making the aqueous dispersion of polymer particles are provided.

СПОСОБ ОЧИСТКИ РЕГЕНЕРИРОВАННОГО ПОЛИПРОПИЛЕНА

Изобретение относится к способу очистки загрязненных полимеров с использованием растворителя под давлением и твердых сред. Способ очистки регенерированного полипропилена включает получение регенерированного полипропилена и приведение его в контакт с жидким растворителем при повышенной температуре и давлении с получением экстрагированного регенерированного полипропилена. Экстрагированный регенерированный полипропилен растворяют в растворителе при повышенной температуре и давлении с получением раствора, содержащего полипропилен и взвешенные загрязняющие примеси. После отстаивания раствор очищают при повышенной температуре и давлении посредством приведения в контакт с твердой средой, с получением раствора, содержащего более чистый полипропилен. Затем более чистый полипропилен отделяют от раствора. Обеспечивается получение очищенного полипропилена, по существу, не имеющего цвета и запаха. 14 з.п. ф-лы, 5 ил., 1 табл., 4 пр.

Способ очистки загрязненных полимеров

Изобретение относится к способу очистки загрязненных полимеров с использованием растворителя под давлением и твердых сред. Способ очистки регенерированного полимера включает получение регенерированного полимера и растворение его в растворителе при повышенной температуре и давлении, чтобы получить раствор полимера, который проходит очистку при повышенной температуре и давлении посредством приведения в контакт раствора полимера с твердой средой, чтобы получить более чистый раствор полимера. Затем от более чистого раствора полимера отделяют более чистый полимер. Регенерированный полимер выбирают из полимеров после бытового использования, полимеров после промышленного использования и их комбинаций. При этом растворитель выбирают из группы, состоящей из С-Салифатических углеводородов и их смесей. Обеспечивается получение полимера с улучшенными цветовыми характеристиками и со сниженным неприятным запахом. 13 з.п. ф-лы, 4 ил., 1 табл., 3 пр.

СПОСОБ ДЕГАЗАЦИИ АРОМАТИЧЕСКОГО ПОЛИМЕРА С АЛКИЛЕНОВОЙ ГРУППОЙ

1. Способ дегазации ароматического полимера с алкиленовой группой, в котором: ! а) обеспечивают продуктовый ароматический полимер с алкиленовой группой в виде массы полимерного расплава, также включающего ароматический мономер с алкиленовой группой и олигомеры, ! б) направляют массу полимерного расплава на первый этап дегазации с получением первого газообразного потока, содержащего ароматический мономер с алкиленовой группой и олигомеры, и второго потока, содержащего оставшуюся часть массы полимерного расплава, ! в) добавляют во второй поток воду в качестве вымывающего вещества с получением третьего потока, содержащего оставшуюся часть массы полимерного расплава и воды, ! г) направляют третий поток на второй этап дегазации с получением четвертого газообразного потока, содержащего воду, ароматический мономер с алкиленовой группой и олигомеры, и пятого потока, содержащего дегазированную массу полимерного расплава, ! д) направляют четвертый газообразный поток на этап разделения с получением шестого потока, содержащего воду и ароматический мономер с алкиленовой группой, и седьмой поток, содержащий олигомеры, ! е) направляют шестой поток на этап разделения для отделения восьмого потока, содержащего воду и уменьшенное количество ароматического мономера с алкиленовой группой, от девятого потока, содержащего оставшуюся часть ароматического мономера с алкиленовой группой, ! ж) направляют восьмой поток на азеотропную отпарку в отпарной колонне в условиях вакуума при использовании водяного пара с получением потока верхнего погона, содержащего водяной пар и основную часть ароматического мономера с алкилено РОССИЙСКАЯ ФЕДЕРАЦИЯ (19) RU (11) 2010 100 338 (13) A (51) МПК C08F 6/00 (2006.01) ФЕДЕРАЛЬНАЯ СЛУЖБА ПО ИНТЕЛЛЕКТУАЛЬНОЙ СОБСТВЕННОСТИ, ПАТЕНТАМ И ТОВАРНЫМ ЗНАКАМ (12) ЗАЯВКА НА ИЗОБРЕТЕНИЕ (21)(22) Заявка: 2010100338/04, 03.06.2008 (71) Заявитель(и): ИНЕОС ЮРОУП ЛИМИТЕД (GB) Приоритет(ы): (30) Конвенционный приоритет: 12.06.2007 EP 07252376.4 (72) Автор(ы): ГАЛЕВСКИ Жан- ...

Method for producing saponifield ethylene-vinyl acetate copolymer

Improvements in and relating to a process for the production of polyolefins

Polyolefins prepared by "low-pressure" methods and after removal of catalyst residues, are rendered odourless and tasteless by drying them in contact with an atmosphere which contains less than 500 p.p.m. of free oxygen and at a temperature below the melting-point of the polyolefin. In the example, pulverulent polypropylene, in a damp condition after separation of the washing alcohol and stabilization with known stabilizers, was dried for 5 hours in a vacuum drier at 80 DEG to 85 DEG C. at a pressure of 0.1 to 0.2 atmosphere of nitrogen containing less than 1 p.p.m. of oxygen.

PROCESS FOR DRYING CHLORINATED POLYMERS

... 1524777 Drying chlorinated polymers HOECHST AG 12 July 1977 [16 July 1976] 29217/77 Heading F4G Chlorinated polymer obtained by a filterseparation process is dried in two or more fluidized beds connected in series, e.g. by screw conveyers, the first bed, which contains an agitator, being operated continuously, and the succeeding beds either continuously or bathwise. Hot air, which may be circulated, is the fluidizing gas.

PROCEDURE FOR THE PRODUCTION OF POWDER AND GRANULATFÖRMIGEN POLYMERS

PROCEDURE FOR THE PRODUCTION OF SOAPED ETHYLEN VINYL ACETATE COPOLYMERS

WASCHVERFAHREN FOR THE CLEANING OF N-BZW. AMINO OR GROUPS OF AMMONIUM OF HALTIGEN POLYMERS

VERFAHREN ZUR KONTINUIERLICHEN TROCKNUNG VON N- BZW. AMINO-, AMMONIUM- ODER SPIROBICYCLISCHE AMMONIUMGRUPPEN HALTIGEN POLYMEREN

PROCEDURE FOR the CONTINUOUS DRYING PROCESS OF n AND/OR AMINO, AMMONIUM OR SPIROBICYCLI GROUPS OF AMMONIUM of HALTIGEN POLYMERS

VERFAHREN ZUR KONTINUIERLICHEN TROCKNUNG VON N- BZW. AMINO-, AMMONIUM- ODER SPIROBICYCLISCHE AMMONIUMGRUPPEN HALTIGEN POLYMEREN

PROCEDURE FOR THE CONTINUOUS PRODUCTION OF INTERLACED PURIFY-HASTY GELFÖRMIGEN POLYMERS

Process For Producing Water-Absorbing Polymer Particles

A process for producing water-absorbing polymer particles, comprising polymerization of a monomer solution or suspension, drying the resulting polymer gel, and grinding and classifying the dried polymer gel, wherein the grinding is performed by means of a multistage roll mill, the first milling gap has a width of 500 to 5000 μm, the product mass flow passing through the first milling gap is conducted through a magnetic separator to the second milling gap, and the second milling gap has a smaller gap width than the first milling gap.

Drying method for granular water-containing gel-like cross-linked polymer

The present invention is to provide a drying method by which both cost reduction and superior physical properties can be attained in a step which comprises subjecting a water-containing gel-like crosslinked polymer obtained by polymerizing an aqueous monomer solution to fine granulation during or after the polymerization, and drying the resultant particulate water-containing gel-like crosslinked polymer with a through-circulation band dryer. The method has a feature in that the drying conditions over a period from a time of introducing the particulate water-containing gel-like crosslinked polymer into a drying zone of the through-circulation band dryer to a time of reaching a solid content concentration thereof to 80% by weight, satisfy that (1) a difference of temperature between a temperature of hot air blown to a particulate hydrogel layer and a temperature measured after the hot air passes through the particulate hydrogel layer is 20 to 70° C.

Method for the Continuous Production of Water Absorbent Polymer Particles

A process for continuously preparing water-absorbing polymer beads, comprising the drying of a polymer gel on a forced-air belt dryer, the water content of the polymer gel being used to control the forced-air belt dryer during or after the drying.

Process for producing water-absorbing polymer particles

The invention relates to a process for producing water-absorbing polymer particles, comprising polymerization, drying the resulting polymer gel on a through circulation belt dryer, crushing the dried polymer gel, pre-grinding, separating of incompletely dried particles with a perforated plate, grinding and classifying the resulting polymer particles.

PARTICULATE POLYVINYL ALCOHOL, PROCESS FOR MAKING AND USES OF THE SAME

The present invention relates generally to a polyvinyl alcohol composition having higher amorphous polyvinyl alcohol polymer content and various end uses thereof. 1. A polyvinyl alcohol composition of particulate agglomerated polyvinyl alcohol particles , wherein:(1) the polyvinyl alcohol is a hydrolyzed polymer of a monomer component consisting essentially of vinyl acetate and, optionally, up to about 10 mol % of one or more acrylate monomers, with a degree polymerization of from about 400 to about 10000, and a degree of hydrolysis of about 93% or greater; and(2) the composition has a D(90) particle size of from about 1 μm to about 1000 μm, a bulk density of about 50 g/cm3 or greater, and a % warm-water (35° C.) solubles of about 5% or greater.2. The polyvinyl alcohol composition of claim 1 , wherein the polyvinyl alcohol composition is produced in a slurry alcoholysis process with a heat treatment step claim 1 , and the polyvinyl alcohol is produced at 50° C. or less in the heat treatment step and has a crystallinity reduced by about 2% to about 20% as compared to a polyvinyl alcohol produced under the same conditions except at 135° C. in the heat treatment step.3. The polyvinyl alcohol composition of claim 2 , wherein the polyvinyl alcohol is produced at 50° C. or less in the heat treatment step and has a crystallinity reduced by about 2% to about 20% as compared to a polyvinyl alcohol produced under the same conditions except at 110° C. in the heat treatment step.4. A composition comprising a solution of the polyvinyl alcohol composition of substantially dissolved in water.5. A paper inner sizing composition or a paper coating composition comprising the composition of . This application is a divisional application of prior U.S. application Ser. No. 15/440,718, filed Feb. 23, 2017, the disclosures of which are incorporated by reference herein for all purposes as if fully set forth. U.S. Ser. No. 15/440,718 claims priority under 35 U.S.C. § 119 from U.S. ...

Method of dewatering water soluble polymers

Method of dewatering nanocellulose and other water soluble of hydrophilic polymers. The method comprises providing an aqueous suspension formed by nanocellulose in water, said nanocellulose having free hydroxyl groups; mixing the aqueous suspension with an ionic liquid or eutectic solvent which is capable of hydrogen bonding to at least a part of the free hydroxyl groups to form a modified suspension; and evaporating off water from the modified suspension in order to dewater the nanocellulose. With the ionic liquid procedure, solvent exchange with repeated centrifugation steps can be avoided, and solvent consumption and costs reduced, and processing sped up. The nanocellulose stabilized in the water-free environment then allows for access to efficient and thorough water-free chemical modification procedures resulting in highly fibrillated products.

Water-absorbent resin particles

Disclosed are water-absorbent resin particles comprising a crosslinked polymer comprising a monomer unit derived from a water-soluble ethylenically unsaturated monomer, wherein an initial swelling force as measured according to a swelling force test conducted by a predetermined method is 8 N or more, and further, a ratio of the particles having a particle diameter of more than 250 μm and 850 μm or less is 70% by mass or more and a ratio of the particles having a particle diameter of 250 μm or less is 20% by mass or less, with respect to the total amount of the water-absorbent resin particles.

METHOD FOR PRODUCING SUPERABSORBENT PARTICLES

A process for producing superabsorbent particles by polymerizing a monomer solution or suspension, comprising drying of the resultant aqueous polymer gel in an air circulation belt dryer, grinding, classifying, and optionally thermal surface postcrosslinking, wherein the aqueous polymer gel is introduced into the air circulation belt dryer by means of an oscillating conveyor belt and that guide devices are located at the edges of the conveyor belt. 1. A process for producing superabsorbent particles by polymerizing a monomer solution or suspension comprisinga) at least one ethylenically unsaturated monomer which bears an acid group and is at least partly neutralized,b) at least one crosslinker andc) at least one initiator,{'b': ['1', '2'], '#text': 'comprising drying a resultant aqueous polymer gel in an air circulation belt dryer, grinding, classifying, and optionally thermal surface postcrosslinking, wherein the aqueous polymer gel is introduced into the air circulation belt dryer by an oscillating conveyor belt, and wherein guide devices () are located at edges of the conveyor belt ().'}2111. The process according to claim 1 , wherein the guide devices () are located at a discharge end of the conveyor belt and a length of the guide devices () is from 15% to 30% of the length of a conveyor belt claim 1 , the length of the conveyor belt being a distance of a pivot axis from the discharge end claim 1 , and/or wherein a height of the guide devices () is from 10 to 20 cm.31. The process according to claim 1 , wherein the guide devices () are rotated about an angle α at right angles to a running direction of the conveyor belt to the middle of the conveyor belt in running direction.41. The process according to claim 3 , wherein the guide devices () are rotated by 8° to 10°.51. The process according to claim 1 , wherein a part of the guide devices () that is in contact with the conveyor belt is made of silicone rubber.61. The process according to any of claim 1 , wherein ...

Ultra-Pure Methyl Vinyl Ether-Co-Maleic Anhydride Copolymers and Methods for Preparing Same

Ultra-pure methyl vinyl ether-co-maleic anhydride (PMVE/MA) copolymers and the process to produce such ultra-pure polymers by removing trace impurities are provided. A process to provide an ultra-pure methyl vinyl ether-co-maleic anhydride material by solvent washing PMVE/MA copolymer with a solvent, comprises the steps of: (1) providing a solvent system in which impurities in the copolymer matrix are soluble and in which the PMVE/MA copolymer is not soluble, and wherein the solvent system does not react with the copolymer; (2) washing a dry powder or wet filter cake of PMVE/MA copolymer with the solvent system to efficiently and effectively extract trace impurities from the matrix; (3) filtering said copolymer from the solvent system; and (4) drying the subsequent wet filter cake of said copolymer to obtain an ultra-pure methyl vinyl ether-co-maleic anhydride copolymer. 1. A process to provide an ultra-pure methyl vinyl ether-co-maleic anhydride material by solvent washing a methyl vinyl ether-co-maleic anhydride (PMVE/MA) copolymer with a solvent , comprising the steps of:(1) providing a solvent system in which one or more impurities in the copolymer matrix are soluble and in which the PMVE/MA copolymer is not soluble, and wherein the solvent system does not react with the copolymer;(2) washing a dry powder or wet filter cake of PMVE/MA copolymer with the solvent system to efficiently and effectively extract trace impurities from the copolymer matrix;(3) filtering said copolymer from the solvent system; and(4) drying the subsequent wet filter cake of said copolymer to obtain an ultra-pure methyl vinyl ether-co-maleic anhydride copolymer.2. The process according to claim 1 , wherein the one or more impurities comprise one or more of dimethoxy ethane (DME) claim 1 , trimethoxy butane (TMB) claim 1 , acetaldehyde and methanol.3. The process of claim 1 , wherein the solvent system is selected from the group consisting of chlorinated solvents claim 1 , hydrocarbon ...

Superabsorbent polymer production using certain carriers

A process is described for production of superabsorbents, comprising conveying steps for transporting the particulate material obtained, with use of a conveying machine from the group of the mechanical continuous conveyors with traction means in at least one of the conveying steps. Conveying machines used with preference are tubular drag conveyors and/or bucket conveyors.

PRODUCTION PROCESS FOR PRODUCING WATER-ABSORBENT POLYMER PARTICLES AND BELT DRYER

A production process for production of water absorbing polymer particles, including drying an aqueous polymer gel in a belt drier with a conveyor belt having a drier setup in the interior, in which drying air in the interior of the drier setup is conducted in countercurrent counter to the conveying direction and the interior of the drier setup is kept substantially at a reduced pressure relative to the ambient pressure outside the drier setup, and the interior has and/or forms a pressure zone, and is especially divided into a number of pressure zones. 120.-. (canceled)21. A production process for production of water absorbing polymer particles , where the production process has the following process steps:{'b': 1', '2, 'polymerizing (S) an aqueous monomer solution or suspension for production of an aqueous polymer gel (S),'}{'b': 3', '400', '400', '400', '400, 'drying (S) the aqueous polymer gel in a belt drier with a conveyor belt (), by accommodating the aqueous polymer gel on the conveyor belt () and conveying the polymer gel on the conveyor belt () in a conveying direction (C) of the conveyor belt (),'}{'b': 4', '3, 'crushing and/or grinding (S) the dried polymer gel to give water-absorbing polymer particles, where, for drying (S){'b': 101', '101', '400, 'i': 'i', 'the belt drier has a drier setup () in the interior () of which the conveyor belt () is guided, wherein'}{'b': 101', '101', '101', '101', '101, 'i': i', 'i, 'drying air in the interior () of the drier setup () is conducted in countercurrent (C′) counter to the conveying direction (C) and the interior of the drier setup () is kept substantially, preferably completely, at a reduced pressure (p_U) relative to the ambient pressure (p_A) outside the drier setup (), and the interior () has and/or forms a pressure zone (DZ), and is especially divided into a number of pressure zones (DZ), wherein, in line with conveying direction (C){'b': '100', 'a first internal pressure is formed as inlet pressure at a ...

ACRYLIC RUBBER BALE EXCELLENT IN STORAGE STABILITY AND PROCESSABILITY

An acrylic rubber bale excellent in storage stability and processability, a method for producing the same, a rubber mixture obtained by mixing the acrylic rubber bale, and a rubber cross-linked product of the rubber mixture are provided. The acrylic rubber bale according to the present invention includes an acrylic rubber having a reactive group and a weight average molecular weight (Mw) of 100,000 to 5,000,000, wherein an amount of gel insoluble in methyl ethyl ketone is 50% by weight or less, and pH is 6 or less. 1. An acrylic rubber bale , comprisingan acrylic rubber having a reactive group and a weight average molecular weight (Mw) of 100,000 to 5,000,000, whereinan amount of gel insoluble in methyl ethyl ketone is 50% by weight or less, and pH is 6 or less.2. The acrylic rubber bale according to claim 1 , wherein the amount of gel insoluble in methyl ethyl ketone is 10% by weight or less.3. The acrylic rubber bale according to claim 1 , wherein all of 20 values of the amount of gel of the acrylic rubber bale measured at arbitrary 20 points fall within the range of (average value −5) to (average value +5) % by weight.4. The acrylic rubber bale according to claim 1 , wherein a ratio (Mz/Mw) of a Z-average molecular weight (Mz) to a weight average molecular weight (Mw) is 1.3 or more.5. The acrylic rubber bale according to claim 1 , wherein a complex viscosity ([η] 100° C.) at 100° C. is in the range of 1 claim 1 ,500 to 6 claim 1 ,000 Pa·s.6. The acrylic rubber bale according to claim 1 , wherein a ratio ([η] 100° C./[η] 60° C.) of a complex viscosity ([η] 100° C.) at 100° C. to a complex viscosity ([η] 60° C.) at 60° C. is 0.5 or more.7. The acrylic rubber bale according to claim 1 , wherein a ratio ([η] 100° C./[η] 60° C.) of a complex viscosity ([η] 100° C.) at 100° C. to a complex viscosity ([η] 60° C.) at 60° C. is 0.8 or more.8. The acrylic rubber bale according to claim 1 , wherein a specific gravity is in the range of 0.7 to 1.5.9. The acrylic rubber bale ...

PROCESS FOR PRODUCING SURFACE- POSTCROSSLINKED WATER-ABSORBENT POLYMER PARTICLES

The present invention relates to a process for producing surface-postcrosslinked water-absorbent polymer particles by coating of water-absorbent polymer particles having a content of residual monomers in the range from 0.03 to 15% by weight with at least one surface-postcrosslinker and thermal surface-postcrosslinking at temperatures in the range from 100 to 180° C. 1. Surface-postcrosslinked water-absorbent polymer particles having a centrifuge retention capacity from 35 to 75 g/g , an absorption under high load from 20 to 50 g/g , a level of extractable constituents of less than 10% by weight , and a porosity from 20 to 40%.2. Polymer particles according to wherein the polymer particles have a centrifuge retention capacity from 40 to 55 g/g.3. Polymer particles according to claim 1 , wherein the polymer particles have an absorption under high load from 25 to 35 g/g.4. Polymer particles according to claim 1 , wherein polymer particles have a porosity from 25 to 30%.7. Polymer particles according to claim 5 , wherein the polymer particles have a centrifuge retention capacity of at least 40 g/g.8. Polymer particles according to wherein the polymer particles have a total liquid uptake of at least 45 g.10. Polymer particles according to claim 9 , wherein the polymer particles have a change of characteristic swelling time of less than 0.4.11. Polymer particles according to claim 9 , wherein the polymer particles have a centrifuge retention capacity of at least 40 g/g.12. Polymer particles according to claim 1 , wherein the polymer particles have a mean sphericity from 0.80 to 0.95.13. Polymer particles according to claim 1 , wherein the polymer particles have a bulk density from 0.6 to 1 g/cm.14. Polymer particles according to claim 1 , wherein the polymer particles have an average particle diameter from 200 to 550 μm.15. A fluid-absorbent article claim 1 , comprising water-absorbent polymer particles according to and less than 15% by weight fibrous material and/or ...

PROCESS FOR PRODUCING AQUEOUS POLYACRYLAMIDE SOLUTIONS

Process for producing aqueous polyacrylamide solutions by polymerizing an aqueous solution comprising at least acrylamide thereby obtaining an aqueous polyacrylamide gel and dissolving said aqueous polyacrylamide gel in water, wherein the process is carried out in a modular, relocatable plant. The plant preferably is deployed at a location at which aqueous polyacrylamide solutions are used, for example on an oilfield or in a mining area. 146.-. (canceled)47. A process for producing an aqueous polyacrylamide solution comprising polymerizing an aqueous solution comprising at least acrylamide thereby obtaining an aqueous polyacrylamide gel and dissolving said aqueous polyacrylamide gel in water , characterized in that the process is conducted in a modular , relocatable plant and the process comprises at least the following steps:[1] Preparing—in a relocatable monomer make-up unit—an aqueous monomer solution comprising at least water and 5% to 45% by weight—relating to the total of all components of the aqueous monomer solution—of water-soluble, monoethylenically unsaturated monomers, wherein said water-soluble, monoethylenically unsaturated monomers comprise at least acrylamide [{'sup': 3', '3, 'the polymerization is performed in a relocatable polymerization unit having a volume of 1 mto 100 m,'}, {'sub': '1', 'the aqueous monomer solution before the onset of polymerization has a temperature Tnot exceeding 30° C., and'}, {'sub': '2', 'the temperature of the polymerization mixture raises in course of polymerization—due to the polymerization heat generated—to a temperature Tof at least 45° C.,'}], '[2] Inerting and radically polymerizing the aqueous monomer solution prepared in step [1] in the presence of suitable initiators for radical polymerization under adiabatic conditions, wherein'}{'sub': '2', 'thereby obtaining an aqueous polyacrylamide gel having a temperature Twhich is hold in the relocatable polymerization unit,'}[3] removing the aqueous polyacrylamide gel ...

Process for the production of water and solvent-free halobutyl rubbers

The present invention relates to water and solvent-free halogenated butyl rubber products as well as a process for the production thereof.

A Method for Preparing Superabsorbent Polymer

The present invention relates to a method for preparing a superabsorbent polymer having excellent absorption performance, and more specifically, to a method for preparing a superabsorbent polymer that can effectively inhibit the initiation of a polymerization reaction in a pipe, before being introduced into a polymerization reactor, thus preventing process trouble.

Super Absorbent Polymer and Method for Preparing Same

The present invention relates to a super absorbent polymer which not only has excellent basic absorption performance but also can improve rewet characteristics and leakage suppression characteristics of hygienic materials such as diapers, and a method for preparing the same. The super absorbent polymer includes: a base polymer powder including a first cross-linked polymer of a water-soluble ethylenically unsaturated monomer having an acidic group of which at least a part is neutralized; and a surface crosslinked layer that is formed on the base polymer powder and includes a second cross-linked polymer in which the first crosslinked polymer is further crosslinked via a surface crosslinking agent, wherein the surface crosslinking agent includes a mixture of plural kinds of cyclic alkylene carbonates, and where the mixture has a Hansen solubility parameter by hydrogen bonding component of 13 or more.

FILM FORMING MATERIAL FOR LITHOGRAPHY, COMPOSITION FOR FILM FORMATION FOR LITHOGRAPHY, UNDERLAYER FILM FOR LITHOGRAPHY, AND METHOD FOR FORMING PATTERN

An object of the present invention is to provide a film forming material for lithography that is applicable to a wet process, and is useful for forming a photoresist underlayer film excellent in heat resistance, etching resistance, embedding properties to a supporting material having difference in level, and film flatness; and the like. A film forming material for lithography comprising a compound having a group of the following formula (0): 2. The film forming material for lithography according to claim 1 , wherein the compound having a group of the above formula (0) is at least one selected from the group consisting of a polycitraconimide compound and a citraconimide resin.3. The film forming material for lithography according to claim 1 , wherein the compound having a group of the above formula (0) is at least one selected from the group consisting of a biscitraconimide compound and an addition polymerization citraconimide resin.8. The film forming material for lithography according to claim 1 , further comprising a crosslinking agent.9. The film forming material for lithography according to claim 8 , wherein the crosslinking agent is at least one selected from the group consisting of a phenol compound claim 8 , an epoxy compound claim 8 , a cyanate compound claim 8 , an amino compound claim 8 , a benzoxazine compound claim 8 , a melamine compound claim 8 , a guanamine compound claim 8 , a glycoluril compound claim 8 , a urea compound claim 8 , an isocyanate compound claim 8 , and an azide compound.10. The film forming material for lithography according to claim 8 , wherein the crosslinking agent has at least one allyl group.11. The film forming material for lithography according to claim 8 , wherein a content ratio of the crosslinking agent is 0.1 to 100 parts by mass based on 100 parts by mass of a total mass of the biscitraconimide compound and the addition polymerization citraconimide resin.12. The film forming material for lithography according to claim 1 , ...

Gel pulverization device, method for manufacturing polyacrylic acid (polyacrlate) superabsorbent polymer powder, and superabsorbent polymer powder

Provided is a water absorbent resin that is useful to sanitary materials such as a disposable diaper, a sanitary napkin, and a blood absorbent for medical use each having a higher liquid permeability and a higher water absorbing speed. Further provided is a water absorbent resin powder that is useful to sanitary materials such as a disposable diaper, a sanitary napkin, and a blood absorbent for medical use each having increased in absorbency of a liquid and in heat retaining property. A gel grinding device to be used to produce a water absorbent resin, includes: a screw; a feed opening; an extrusion opening; a porous plate; and a barrel, the barrel including a return preventing member provided on an inner surface thereof, and the return preventing member satisfying at least one of specific parameters. 111.-. (canceled)12. A water absorbent resin powder comprising a polyacrylic acid (salt)-based water absorbent resin as a main component ,the water absorbent resin powder satisfying the following (A) to (C):(A) the water absorbent resin powder containing particles smaller than 150 μm in a ratio of 0 mass % to 4.5 mass % before an impact resistance test, and the water absorbent resin powder containing, in a ratio of 0 mass % to 4.5 mass %, particles smaller than 150 μm and increased by the impact resistance test;(B) the water absorbent resin powder having a saline flow conductivity (SFC) of not less than 10; and(C) the water absorbent resin powder having a thermal conductivity of not more than 125 [mW/(m·K)].13. The water absorbent resin powder as set forth in claim 12 , wherein the water absorbent resin powder has an absorption capacity under load (AAP) of not less than 20 [g/g].14. The water absorbent resin powder as set forth in claim 12 , wherein the water absorbent resin powder has an internal gas bubbles ratio of 0% to 3.7% claim 12 , the internal gas bubbles ratio being specified by the following equation:{'br': None, '(internal gas bubbles ratio) [%]={(true ...

Preparation method of superabsorbent polymer

Provided is a method of preparing a superabsorbent polymer. According to the method of preparing the superabsorbent polymer of the present invention, provided is a superabsorbent polymer having improved physical properties, in which the superabsorbent polymer has improved absorption rate and liquid permeability without reduction in centrifuge retention capacity or absorbency under load.

Super absorbent polymer and method for preparing same

The present invention relates to a super absorbent polymer exhibiting more improved liquid permeability while maintaining excellent absorption performance, and a method for producing the same. The super absorbent polymer comprises: a base polymer powder comprising a first cross-linked polymer of a water-soluble ethylenically unsaturated monomer having at least partially neutralized acidic groups; and a surface crosslinked layer formed on the base polymer powder and including a second cross-linked polymer in which the first crosslinked polymer is further cross-linked through an alkylene carbonate having two to five carbon atoms. The super absorbent polymer satisfies predetermined physical properties.

Method for preparing a dry cationic hydrogel polymer product, polymer product and its use

The invention relates to a method for preparing a dry cationic hydrogel polymer product. The method comprises polymerisation of a reaction mixture comprising ethylenically unsaturated monomers in presence of water and initiator(s) by radical polymerisation and obtaining a hydrogel polymer. The hydrogel polymer is comminuted by chopping or shredding, and dried, whereby a dry hydrogel polymer product in powder form is obtained. At least one cationic reverse phase emulsion polymer is added to the hydro polymer at the comminuting step. The invention relates also to a dry cationic hydrogel polymer composition prepared by the method and its use. 2. Method according to claim 1 , wherein the cationic reverse phase emulsion polymer is added in an amount of >5 weight % claim 1 , preferably >10 weight % claim 1 , more preferably >15 weight % claim 1 , calculated from the weight of dry hydrogel polymer.3. Method according to claim 1 , wherein the cationic reverse phase emulsion polymer is cationic polyacrylamide having a charge density of 10-80 mol % claim 1 , preferably 40-80 mol % claim 1 , more preferably 60-80 mol %.4. Method according to claim 1 , wherein the reverse phase emulsion polymer is cationic branched and/or cross-linked polyacrylamide claim 1 , where the amount of cross-linker agent is <500 ppm claim 1 , preferably <250 ppm claim 1 , more preferably <100 ppm claim 1 , calculated from the total weight of the used monomers.5. Method according to claim 1 , characterised in that wherein the reverse phase emulsion polymer has a ratio of bulk viscosity to standard viscosity claim 1 , i.e. BV/SV ratio claim 1 , in the range from 125 to 550 claim 1 , preferably from 150 to 500.6. Method according to claim 1 , wherein the reverse phase emulsion polymer is added at comminuting step without addition of a lubricant.7. Method according to claim 1 , wherein the ethylenically unsaturated monomer is selected from acrylamide and its derivatives; methacrylamides; N- ...

MAKING LOW-SODIUM RESIN

Provided is method of treating a collection of resin beads (a) comprising the steps of 1. A method of treating a collection of resin beads (a) comprising the steps of wherein the resin beads (a) comprise one or more vinyl polymers having quaternary ammonium groups;', 'wherein 90 mole % or more of the quaternary ammonium groups are each associated with a chloride anion;, '(a) providing the collection of resin beads (a),'}{'sub': n', 'p, 'claim-text': wherein M is a cation of charge (+i) that contains no metal atom, alkali metal atom, or alkaline earth atom;', 'wherein X is an anion of charge (−j), wherein X is selected from the group consisting of carbonate, bicarbonate, dihydrogen phosphate, formate, acetate, and aminoacetate;', 'and wherein (n·i)=(p·j)., '(b) bringing the collection of resin beads (a) into contact with an aqueous solution (b) comprising one or more dissolved (M)Xto form a mixture (b),'}(c) separating water and compounds dissolved in the water from the mixture (b), to form resin beads (c) and waste solution (bw);{'sub': 'p', 'claim-text': wherein M3 is a cation of charge (+k) that contains no metal atom, alkali metal atom, or alkaline earth atom;', 'and wherein p=k., '(d) bringing resin beads (c) into contact with an aqueous solution (c) comprising dissolved (M3)(OH), to form a mixture (d)'}2. The method of claim 1 , comprising the additional step (e) of separating water and compounds dissolved in the water from the mixture (d) claim 1 , to form resin beads (e) and waste solution (ew).3. The method of claim 2 , wherein the one or more vinyl polymers comprise one or more vinyl aromatic polymers.5. The method of claim 2 , wherein claim 2 , after step (e) claim 2 , the sodium content of resin (e) is 100 ppb or less claim 2 , by weight based on the total weight of resin (e).6. The method of claim 1 , wherein M is ammonium claim 1 , trialkyl ammonium claim 1 , or a mixture thereof.7. The method of claim 1 , wherein M is ammonium.8. The method of claim 1 ...

Method for producing super absorber particles

A process for producing superabsorbent particles, comprising drying of a polymer gel, removal of incompletely dried polymer particles, comminution of the polymer particles removed, recycling of the comminuted polymer particles and storage of the recycled polymer particles.

Methods for forming ultra high molecular weight polyethylenes and methods for reducing contaminant content in such

According to one or more embodiments disclosed herein, the amount of one or more contaminants in an initial ultra high molecular weight polyethylene composition may be reduced by a method including contacting the initial ultra high molecular weight polyethylene composition with an acid to form a processed ultra high molecular weight polyethylene composition. The initial ultra high molecular weight polyethylene composition may include at least 0.02 wt. % of one or more contaminants. The contacting of the acid with the initial ultra high molecular weight polyethylene composition may be for a time, at a pressure, and at a temperature sufficient to reduce the amount of the one or more contaminants in the initial ultra high molecular weight polyethylene.

Method for the continuous production of crosslinked particulate gel-type polymers

Disclosed is a method for the continuous production of crosslinked, particulate, gel-type polymers by copolymerizing a) water-soluble, monoethylenically unsaturated monomers, b) 0.001 to 5 molar percent of monomers containing at least two polymerizable groups, the percentage being relative to the monomers (a), in a mixer. The substances that are added at the beginning of the kneader are conveyed in an axial direction towards the end of the mixer. The inventive method is characterized in that at least one of the following conditions is met: i) the filling level in the kneader mixer is at least 71 percent; ii) the water-soluble, monoethylenically unsaturated monomers contain up to 150 ppm of a semicyclic ether of a hydroquinone; iii) the temperature in the polymerization zone exceeds 65 °C; iv) the kneader has a remixing rate of less than 0.33.

Production of Superabsorbent Polymers

The invention relates to the production of superabsorbent polymers comprising conveying a polymer gel having acid groups on an oscillating conveyor belt to a continuous through-circulation belt dryer, wherein the belt speed of the conveyor belt is at least 0.4 m/s.

A process for producing surface-postcrosslinked water-absorbent polymer particles

The present invention relates to a process for producing surface-postcrosslinked water- absorbent polymer particles by coating of water-absorbent polymer particles having a content of residual monomers in the range from 0.03 to 15% by weight with at least one surface-postcrosslinker and thermal surface-postcrosslinking at temperatures in the range from 100 to 180°C.

A process for the production of bimodal hdpe with wax recovery

The invention is directed to the wax removal from a low pressure slurry process for the production of bimodal high density polyethylene comprising a polymerisation stage, a powder drying stage, an extrusion and pellet handling stage, recycling stages and a wax removal unit. The wax from the wax removal unit is introduced in a wax recovery unit in which a reduced pressure is created and in which steam is introduced. The invention also relates to such polyethylene wax obtained by the process according to the present invention, which wax has a flame point ranging between 170°C and 200°C.

COMPRESSION TYPE DEHYDRATOR

Disclosed is a compression type dehydrator including: an upper plate that includes a pressurizing portion and a first guide adjacent to the pressurizing portion and spaced apart from the pressurizing portion, and performs a vertical movement by a hydraulic cylinder; a feed plate that includes a hollow portion and a first guide groove surrounding the hollow portion and guiding the vertical movement of the first guide, and is positioned on a lower portion of the upper plate; a slurry supply line connected to the feed plate; a lower plate positioned on a lower portion of the feed plate and having a plurality of holes formed therein; and a dehydration means including a filtration belt positioned in close contact with an upper portion of the lower plate. 1. A compression type dehydrator comprising:an upper plate that comprises a pressurizing portion and a first guide adjacent to the pressurizing portion and spaced apart from the pressurizing portion, and performs a vertical movement by a hydraulic cylinder;a feed plate that comprises a hollow portion and a first guide groove surrounding the hollow portion and guiding the vertical movement of the first guide, and is positioned on a lower portion of the upper plate;a slurry supply line connected to the feed plate;a lower plate positioned on a lower portion of the feed plate and having a plurality of holes formed therein; anda dehydration means comprising a filtration belt positioned in close contact with an upper portion of the lower plate.2. The compression type dehydrator of claim 1 , wherein a slurry is disposed in the upper portion of the lower plate and the hollow portion of the feed plate claim 1 , through the slurry supply line claim 1 , andfiltered moisture is introduced into the holes of the lower plate while the disposed slurry is compressed by a downward movement of the upper plate.3. The compression type dehydrator of claim 2 , further comprising a drain pipe connected to the plurality of holes and discharging ...

Ethylene-vinyl alcohol copolymer resin composition, ethylene-vinyl alcohol copolymer film formed therefrom, and multilayer structure containing the same

The present invention relates to an ethylene-vinyl alcohol copolymer (EVOH) resin composition, an EVOH film formed therefrom, and a multilayer structure containing the same. The surface roughness of the EVOH resin composition is the peak material volume (Vmp) between 0.0008 and 10 μm3/μm2. The EVOH of the invention can reduce the torque output during processing, and can obtain the EVOH film with excellent appearance.

Solid state devolatilization of syndiotactic vinyl aromatic polymers with catalyst deactivation

Solid state devolatilization of syndiotactic vinyl aromatic polymers with catalyst deactivation

The present invention is an improved solid state polymer devolatilization process which comprises heating a wet feed mixture comprising polymer, residual monomer(s), process solvents and active catalyst residues in the presence of an inert gas, wherein the improvement comprises replacing the inert gas with a catalyst desactivating gas.

Solid state devolatilization of syndiotactic vinyl aromatic polymers with catalyst deactivation

The present invention is an improved solid state polymer devolatilization process which comprises heating a wet feed mixture comprising polymer, residual monomer(s), process solvents and active catalyst residues in the presence of an inert gas, wherein the improvement comprises replacing the inert gas with a catalyst deactivating gas.

Process for the production of water and solvent-free halobutyl rubbers

본 발명은 무수 무용매 할로겐화 부틸 고무 생성물, 뿐만 아니라 그의 제조 방법에 관한 것이다. 방법은 a.) 1개 이상의 농축기 유닛에서 하나 이상의 할로겐화 부틸 고무 및 하나 이상의 휘발성 화합물을 함유하는 유체를 처리하는 단계, b.) 농축 유체를 재가열하는 단계, 및 c.) 재가열된 농축 유체를 1개 이상의 압출기로 공급하는 단계를 적어도 포함한다. The present invention relates to anhydrous, non-halogenated butyl rubber products, as well as processes for their preparation. The method comprising the steps of: a.) Treating a fluid containing at least one halogenated butyl rubber and at least one volatile compound in one or more concentrator units, b.) Reheating the enriched fluid, and c.) Reheating the reheated enriched fluid to 1 To at least one extruder.

Method of increasing the stiffness of high density polyethylene

Elastomer extrusion drying with gas injection

Extrusion drying of wet rubber crumb particles in the last phase of the overall elastomer drying process is improved through use of gas injected into the compression zone of an extruder thereby providing an improved efficiency in the explosion drying process. Rubber particles having a very low moisture content, such as less than 0.2% by weight, frequently less than 0.1%, are produced.

Solids transfer and storage system

Process for the devolatilization of a polymer of an aromatic alkylene

The present invention relates to a process for devolatilization of a polymer of an aromatic alkylene, such as styrene, and in particular, to an improved process using water as a stripping agent (i) in which the total amount of water to be disposed of can be reduced, (ii) which allows at least a portion of the water to be recycled as stripping agent, reducing make-up requirements for the stripping agent, and (iii) which allows at least a portion of the aromatic alkylene monomer in the water to be recycled to the polymerisation process (via the devolatilization steps) rather than disposed of

Process for devolatilization of polymer of an aromatic alkylene

Process for devolatilization of a polymer of an aromatic alkylene, such as styrene and, in particular, an improved process using water as a stripping agent (i) in which the total amount of water to be disposed of can be reduced, (ii) which allows at least a portion of the water to be recycled as stripping agent, reducing make-up requirements for the stripping agent, and (iii) which allows at least a portion of the aromatic alkylene monomer in the water to be recycled to the polymerization process (via the devolatilization steps) rather than being disposed.

Process for producing surface-postcrosslinked water-absorbent polymer particles

FIELD: technological processes. SUBSTANCE: invention relates to a process for producing surface-postcrosslinked water-absorbent polymer particles. Disclosed is a method of producing surface-postcrosslinked water-absorbent polymer particles by forming water-absorbent polymer particles, having a residual monomer content in the range of 0.1 to 15 % by weight, coating said particles with at least one surface postcrosslinker and performing thermal surface-postcrosslinking at a temperature in the range from 100 to 170 °C. EFFECT: technical result is obtained polymer particles obtained by the claimed method have improved characteristics – high retention capacity in a centrifuge and high absorption under load. 31 cl, 16 dwg, 35 ex, 13 tbl РОССИЙСКАЯ ФЕДЕРАЦИЯ (19) RU (11) (13) 2 653 056 C2 (51) МПК C08F 220/06 (2006.01) A61L 15/24 (2006.01) ФЕДЕРАЛЬНАЯ СЛУЖБА ПО ИНТЕЛЛЕКТУАЛЬНОЙ СОБСТВЕННОСТИ (12) ОПИСАНИЕ ИЗОБРЕТЕНИЯ К ПАТЕНТУ (52) СПК A61L 15/22 (2006.01); A61L 15/225 (2006.01); A61L 15/425 (2006.01); A61L 15/60 (2006.01); B01J 20/267 (2006.01); B01J 20/28004 (2006.01); B01J 20/28011 (2006.01); B01J 20/28019 (2006.01); C08F 220/06 (2006.01); C08J 3/245 (2006.01); C08J 3/247 (2006.01); C08J 9/00 (2006.01) (21)(22) Заявка: 2015123807, 07.11.2013 07.11.2013 Дата регистрации: Приоритет(ы): (30) Конвенционный приоритет: 21.11.2012 US 61/728839; 26.08.2013 EP 13181703.3 (45) Опубликовано: 07.05.2018 Бюл. № 13 (73) Патентообладатель(и): БАСФ СЕ (DE) (85) Дата начала рассмотрения заявки PCT на национальной фазе: 22.06.2015 (56) Список документов, цитированных в отчете о поиске: WO 2006094907 A1, 14.09.2006. WO 2006094907 A1, 14.09.2006. RU 2248219 C2, 20.03.2005. US 20120091392 A1, 19.04.2012. RU 2369434 C2, 10.10.2009. US 6297335 B1, 02.10.2001. (86) Заявка PCT: R U 2 6 5 3 0 5 6 EP 2013/073236 (07.11.2013) (87) Публикация заявки PCT: WO 2014/079694 (30.05.2014) Адрес для переписки: 105064, Москва, а/я 88, "Патентные поверенные Квашнин, Сапельников и партнеры" (54) СПОСОБ ...

ポリアクリル酸（塩）系吸水性樹脂およびその製造方法

Production method for water-absorbing resin

There is provided a production method for a water-absorbing resin for stably and continuously producing the water-absorbing resin with industrially high property, in particular, the water-absorbing resin with high liquid permeation. A method of the present invention relates to a production method for a water-absorbing resin including: a polymerization step of an aqueous solution of an unsaturated monomer; a drying step of the resultant hydrogel polymer; and a surface cross-linking step after drying; characterized by including a pneumatic transportation step for pneumatic transporting the water-absorbing resin powder substance in a pipeline with a surface roughness (Rz) of the inner surface of equal to or smaller than 800 nm, by using gas with a dew point of −5° C. to −100° C.

通过在气相中液滴聚合而生产吸水性聚合物颗粒的方法

本发明涉及一种通过在气相中液滴聚合而生产吸水性聚合物颗粒的方法，其包括在聚合方法之后将所述聚合物颗粒在流化床中干燥。还公开了该吸水性聚合物颗粒、含有所述吸水性聚合物颗粒的产品和卫生制品和实施本发明方法的设备。

用于制备具有改进特性的吸水性聚合物颗粒的方法

本发明涉及一种用于制备具有改进特性的吸水性聚合物颗粒的方法，所述方法包括在多价金属阳离子与络合阴离子的盐的存在下对表面进行热后交联，以及随后对颗粒进行后处理的步骤，该后处理包括用多价金属阳离子与非络合阴离子的盐涂覆颗粒，以及随后再次润湿和干燥颗粒的步骤。

Preparation method of super absorbent polymer

본 발명은 고흡수성 수지의 제조 방법에 관한 것으로, 보다 상세하게는 모노머 조성물을 특정 tan 각도의 소수성 표면을 갖는 기판에 분사하고 약친수성 표면을 갖는 중합반응기에서 UV중합을 진행하는 단계를 포함하는 고흡수성 수지의 제조방법에 관한 것이다. 본 발명은 기존 시트 형태의 단량체 용액을 입자 형태로 전환함에 따라 깊은 층까지 UV 조사가 가능하도록 하여 중합체로의 전환율을 향상시킬 수 있고, 제조된 중합체의 입자 조절이 용이하여 재순환 공정을 최소화 또는 단순화시키며, 입경 분포를 좁게하고 균일성을 향상시켜 고품질의 고흡수성 수지를 제공하는 효과가 있다. The present invention relates to a method for producing a superabsorbent resin, and more particularly to a method for producing a superabsorbent resin, comprising spraying a monomer composition onto a substrate having a hydrophobic surface having a specific tan angle and advancing UV polymerization in a polymerization reactor having a weakly hydrophilic surface And a method for producing the water absorbent resin. The present invention can improve the conversion ratio to a polymer by allowing UV irradiation to a deep layer by converting a conventional monomer solution of a sheet form into a particle form, and it is easy to control the particle of the polymer so that the recycling process can be minimized or simplified Thereby providing a high-absorbency resin of high quality by narrowing the particle diameter distribution and improving the uniformity.

制备超吸收性聚合物的方法

本发明涉及制备超吸收性聚合物的方法。根据本发明的制备超吸收性聚合物的方法包括以下步骤：对包含水溶性烯键式不饱和单体和聚合引发剂的单体组合物进行热聚合或光聚合以形成水凝胶聚合物；干燥所述水凝胶聚合物；粉碎经干燥的聚合物；使经粉碎的聚合物中粒径为180μm或更小的细粉与粒径为300μm或更大的聚合物混合；以及向混合物中添加蒸汽以进行再集合。根据本发明，可获得具有高细粉聚集强度的超吸收性聚合物。

A process for the production of bimodal hdpe with wax recovery

The present invention is directed to the removal of wax with a low pressure slurry process for the production of dual mode high density polyethylene comprising a polymerization stage, a powder drying stage, an extrusion and pellet handling stage, a recycle stage and a wax removal unit. The wax from the wax removal unit is introduced into the wax recovery unit, where a reduced pressure is generated and steam is introduced. The present invention also relates to a polyethylene wax produced by the process according to the invention, wherein said wax has a melting point in the range between 170 ° C and 200 ° C.

Super absorbent polymer and preparation method thereof

본 발명은 우수한 흡수 성능을 유지하면서도, 보다 향상된 통액성을 나타내는 고흡수성 수지 및 이의 제조 방법에 관한 것이다. 이러한 고흡수성 수지는 적어도 일부가 중화된 산성기를 갖는 수용성 에틸렌계 불포화 단량체의 제 1 가교 중합체를 포함하는 베이스 수지 분말; 및 상기 베이스 수지 분말 상에 형성되어 있고, 상기 제 1 가교 중합체가 탄소수 2 내지 5의 알킬렌 카보네이트를 매개로 추가 가교된 제 2 가교 중합체를 포함하는 표면 가교층을 포함하는 고흡수성 수지로서, 소정의 물성을 충족하는 것이다. The present invention relates to a superabsorbent resin exhibiting improved liquid permeability while maintaining excellent absorption performance, and a method for producing the same. Such a superabsorbent resin comprises: a base resin powder comprising a first crosslinked polymer of a water-soluble ethylenically unsaturated monomer having at least partially neutralized acidic groups; And a surface cross-linked layer formed on the base resin powder, wherein the first cross-linked polymer comprises a second cross-linked polymer that is additionally cross-linked through an alkylene carbonate having 2 to 5 carbon atoms, To meet the physical properties of.

Method of degassing aromatic polymer with alkylene group

FIELD: chemistry. SUBSTANCE: method of degassing an aromatic polymer with an alkylene group is described, in which: a) a product aromatic polymer with an alkylene group in form of a mass of molten polymer is provided, also containing an aromatic monomer with an alkylene group, b) the mass of molten polymer is fed to a first degassing step to obtain a first gaseous stream containing an aromatic monomer with an alkylene group and oligomers, and a second stream containing the remaining part of the mass of molten polymer, c) water is added to the second stream as a washing substance to obtain a third stream containing the remaining part of the mass of molten polymer and water, d) the third stream is fed to a second degassing step to obtain a fourth gaseous stream containing water, an aromatic monomer with an alkylene group and oligomers, and a fifth stream containing a degassed mass of molten polymer, e) the fourth gaseous stream is fed to a separation step to obtain a sixth stream containing water and an aromatic monomer with an alkylene group, and a seventh stream containing oligomers, f) the sixth stream is fed to the separation step to separate an eighth stream containing water and a reduced amount of aromatic monomer with an alkylene group from a ninth stream containing the remaining part of the aromatic monomer with an alkylene group, g) the eighth stream is fed for azeotropic stripping in a stripping column in vacuum conditions using water vapour to obtain an overhead product stream containing water vapour and the main part of the aromatic monomer with an alkylene group which, together with the sixth stream, is fed to the separation step (f), and a bottom product stream containing water and a reduced amount of the aromatic monomer with an alkylene group, at least part of which is returned to step (c) as the washing substance. EFFECT: reduced amount of water for recycling, reduced consumption of feed water used as the washing substance. 7 cl, 1 dwg, 1 ex ...

Process for purification and drying of polymer hydrogels

This invention relates to a method for purifying and drying a polymer hydrogel. This invention is based in part upon the discovery that rapid drying of polymer hydrogels can eliminate the problem of unacceptable levels of soluble oligomers caused by prolonged thermal treatment. Rapid drying techniques allow drying hydrogels containing more water than was previously considered possible without a loss in product quality. Furthermore, it was discovered that slurries comprising polymer hydrogels and large quantities of water can be spray dried and that spray drying can be conducted with only minimal oligomer formation.

Process for purification and drying of polymer hydrogels

干燥湿含氟聚合物树脂以及暴露于氧气源以减少变色

本发明提供了减少含氟聚合物树脂的热致变色的方法，所述含氟聚合物树脂通过如下制得：在水性分散体介质中聚合含氟单体以形成水性含氟聚合物分散体，并且通过从所述水性介质中分离湿含氟聚合物树脂来从所述水性介质中分离含氟聚合物，并且干燥来制得含氟聚合物树脂。所述方法包括：在干燥期间将湿含氟聚合物树脂暴露于氧气源。

用于制备无不可溶凝胶和低水平的残留单体的水溶性聚合物的方法

本发明提供了用于将湿凝胶聚合物连续地进料到干聚合物合成操作的干燥步骤中的方法和装置。布置许多具有内部室的活塞，单体和其它试剂通过所述活塞被进料并且聚合成湿凝胶聚合物。每个活塞根据协调的时间表操作，使得当一个活塞完成使聚合物挤压到干燥步骤中时，第二活塞已完成聚合更多的聚合物并且继续进料更多的聚合物，而不中断。接着完成的是再进料更多试剂，以便当下次需要时再次做好准备。因此，成本有效的连续进料可被实现，而没有困扰完成此的先前尝试的污染和杂质问题。

폴리올레핀 엘라스토머 제조 설비

본 발명은 폴리올레핀 엘라스토머 제조 설비에 관한 것으로, 본 발명에 따른 폴리올레핀 엘라스토머 제조 설비는 용매 및 원료를 공급받는 반응기, 상기 반응기로부터 배출되는 생성물을 탈휘발하여, 미반응물을 제거(1차 탈휘발 회수 흐름)하고, 그 나머지를 배출(1차 탈휘발 제조 흐름)하는 1차 탈휘발기, 상기 1차 탈휘발기로부터 배출되는 1차 탈휘발 제조 흐름을 재차 탈휘발하여, 미반응물을 더 제거(2차 탈휘발 회수 흐름)하고, 그 나머지를 배출(2차 탈휘발 제조 흐름)하는 2차 탈휘발기, 물을 이용해, 상기 2차 탈휘발기로부터 배출되는 2차 탈휘발 제조 흐름을 스크럽함으로써, 미반응물 및 물이 기화하고, 고분자 제품이 잔류하게 되는 피니셔 및 상기 1차 탈휘발기에서 제거되는 1차 탈휘발 회수 흐름으로부터 저분자 물질을 제거(불순물 제거 흐름)하고, 그 나머지를 상기 반응기로 회수하는 플래시 드럼을 포함할 수 있다.

표면 가교 처리된 고흡수성 수지 및 그 제조방법

본 발명은 표면 가교 처리된 고흡수성 수지 및 그 제조방법에 관한 것으로서, 보다 자세하게는 고흡수성 수지에 다가 양이온을 포함하는 수용성 염, 새로운 고분자인 폴리카르본산계 공중합체 및 표면가교제를 첨가하여 표면 가교 처리를 진행하여 고흡수성 수지의 물성을 향상시킴으로써 공정 시간 및 비용을 효과적으로 절감할 수 있는 새로운 표면 가교 처리된 고흡수성 수지 및 그 제조방법에 관한 것이다.

Continuous production method of water-absorbing polymer

超吸收性聚合物的制备方法

本发明提供一种制备超吸收性聚合物的方法，该方法能够通过简单而经济的工艺制得由于包含均匀的多孔结构而能够表现出优异吸收速率的超吸收性聚合物。本发明的制备超吸收性聚合物的方法包括以下步骤：在内交联剂的存在下进行具有酸性基团的水溶性烯键式不饱和单体的交联聚合，从而形成含有第一交联聚合物的水凝胶聚合物，所述酸性基团的至少一部分被中和；干燥并粉碎所述水凝胶聚合物；将粉碎的聚合物分级为粒径至少为10μm至150μm的聚合物颗粒、粒径为150μm至200μm的聚合物颗粒，和粒径为200μm至850μm的聚合物颗粒，以形成粒径为150μm至850μm的基础聚合物粉末；以及对所述基础聚合物粉末进行表面交联，其中，在交联聚合步骤中，在所述分级步骤中得到的平均粒径为10μm至200μm的聚合物颗粒和阴离子表面活性剂的存在下进行发泡聚合。

超吸收性聚合物的制备方法

本公开内容涉及能够通过稍后添加简单的添加剂来改善超吸收性聚合物的吸收性能的超吸收性聚合物的制备方法。所述超吸收性聚合物的制备方法包括以下步骤：通过在内交联剂的存在下使具有至少部分被中和的酸性基团的水溶性烯键式不饱和单体交联和聚合而形成水凝胶聚合物；将水凝胶聚合物干燥、粉碎和分级以形成基础树脂粉末；通过在表面交联剂的存在下使基础树脂粉末的表面进一步交联而形成表面交联层，在25℃至80℃的温度下在经表面交联的基础树脂粉末上添加一价至三价金属阳离子，以及将所得添加有金属阳离子的产物在40℃至60℃的温度下保持和老化10分钟至30分钟。

Super absorbent polymer and method for preparation thereof

본 발명은 흡수 속도 및 가압하 흡수력이 우수하고 Rewet 특성이 우수한 고흡수성 수지 및 이의 제조 방법에 관한 것이다. The present invention relates to a superabsorbent resin excellent in absorption rate and pressure-absorbing ability and excellent in rewet characteristics, and a method for producing the same.

Procedure to produce polymer

Procedimiento para producir un polímero, que comprende la etapa 1 de preparar una disolución de polímero que contiene uno o más metales seleccionados de entre el grupo que consiste en aluminio, litio y titanio; la etapa 2 de obtener una mezcla de disolución mezclando la disolución de polímero y agua en una relación en volumen de 0,1 a 10 sobre la base de la disolución de polímero, la etapa A de separar y eliminar la fase acuosa de la mezcla de disolución, tras la etapa 2 y antes de la etapa 3, y la etapa 3 de aplicar una aceleración centrífuga a la mezcla de disolución, tras la etapa 2, en el que en la etapa 1, cuando un contenido de aluminio en un polímero contenido en la disolución de polímero es inferior a 30 ppm, un pH de una fase acuosa de la mezcla de disolución se controla para que sea 10 o inferior en la etapa 2, en la etapa 1, cuando el contenido de aluminio en el polímero contenido en la disolución de polímero es 30 ppm o superior y 200 ppm o inferior, el pH de la fase acuosa de la mezcla de disolución se controla para que sea 5,5 o inferior, o 7 a 10 en la etapa 2. Process for producing a polymer, comprising step 1 of preparing a polymer solution containing one or more metals selected from the group consisting of aluminum, lithium, and titanium; step 2 of obtaining a solution mixture by mixing the polymer solution and water in a volume ratio of 0.1 to 10 based on the polymer solution, step A of separating and eliminating the aqueous phase from the mixture of dissolution, after stage 2 and before stage 3, and stage 3 of applying a centrifugal acceleration to the dissolution mixture, after stage 2, wherein in stage 1, when an aluminum content in a polymer contained in the polymer solution is less than 30 ppm, a pH of an aqueous phase of the solution mixture is controlled to be 10 or less in step 2, in step 1, when the aluminum content in the polymer contained in the polymer solution is 30 ppm or higher and 200 ppm or lower, the pH of the aqueous phase of ...

Preparation method for super absorbent polymer

본 발명은 고흡수성 수지의 제조 방법에 관한 것이다. 본 발명에 따른 고흡수성 수지의 제조 방법은 수용성 에틸렌계 불포화 단량체, 열중합 개시제 및 광중합 개시제를 포함하는 모노머 조성물에 대하여 30 내지 55℃의 온도에서 광중합을 진행하는 단계; 55 내지 120℃의 온도에서 열중합 및 광중합을 진행하여 함수겔상 중합체를 형성하는 단계; 및 상기 함수겔상 중합체를 건조하는 단계를 포함한다. 본 발명에 따르면, 저온에서의 광중합 후 고온에서의 열중합 또는 광중합하는 2단계의 중합 단계를 포함하여, 향상된 물성을 갖는 고흡수성 수지를 수득할 수 있다. The present invention relates to a method for producing a superabsorbent resin. The method for producing a superabsorbent resin according to the present invention comprises: polymerizing a monomer composition comprising a water-soluble ethylenically unsaturated monomer, a thermal polymerization initiator and a photopolymerization initiator at a temperature of 30 to 55 ° C; Conducting thermal polymerization and photopolymerization at a temperature of 55 to 120 캜 to form a hydrogel polymer; And drying the hydrogel polymer. According to the present invention, it is possible to obtain a superabsorbent resin having improved physical properties including a two-step polymerization step in which thermal polymerization at a high temperature or photopolymerization at a low temperature is carried out at a low temperature.

Methods for forming ultra high molecular weight polyethylenes and methods for reducing contaminant content in such

According to one or more embodiments disclosed herein, the amount of one or more contaminants in an initial ultra high molecular weight polyethylene composition may be reduced by a method including contacting the initial ultra high molecular weight polyethylene composition with an acid to form a processed ultra high molecular weight polyethylene composition. The initial ultra high molecular weight polyethylene composition may include at least 0.02 wt. % of one or more contaminants. The contacting of the acid with the initial ultra high molecular weight polyethylene composition may be for a time, at a pressure, and at a temperature sufficient to reduce the amount of the one or more contaminants in the initial ultra high molecular weight polyethylene.

Methods for forming ultra high molecular weight polyethylenes and methods for reducing contaminant content in such

According to one or more embodiments disclosed herein, the amount of one or more contaminants in an initial ultra high molecular weight polyethylene composition may be reduced by a method including contacting the initial ultra high molecular weight polyethylene composition with an acid to form a processed ultra high molecular weight polyethylene composition. The initial ultra high molecular weight polyethylene composition may include at least 0.02 wt.% of one or more contaminants. The contacting of the acid with the initial ultra high molecular weight polyethylene composition may be for a time, at a pressure, and at a temperature sufficient to reduce the amount of the one or more contaminants in the initial ultra high molecular weight polyethylene.

Method for producing water absorbent resin

Method for preparing super absorbent polymer

本公开内容涉及一种用于制备超吸收性聚合物的方法。根据本发明的用于制备超吸收性聚合物的方法包括下述步骤：在30℃至55℃的温度下进行包含水溶性烯键式不饱和单体、热聚合引发剂和光聚合引发剂的单体组合物的光聚合；在55℃至120℃的温度下进行热聚合和光聚合以形成水凝胶聚合物；以及将该水凝胶聚合物干燥。根据本发明，通过包括两阶段聚合步骤可获得具有改良物理性质的超吸收性聚合物，所述两阶段聚合步骤包括在低温下进行光聚合以及之后在高温下进行热聚合或光聚合。

Low-fluoride, reactive polyisobutylene

A method of making a low-fluoride reactive PIB composition includes (a) providing a modified C4 feedstock by way of blending a mixed C4 feedstock with a second feedstock having a lower LB/IsoB ratio; or providing a C4 feedstock with an LB/IsoB index of less than 10%; (b) feeding the modified C4 feedstock or the C4 feedstock with an LB/IsoB index of less than 10% to a CSTR with a homogeneous catalyst comprising BF3 and a modifier selected from alcohols, ethers and mixtures thereof; (c) polymerizing the modified C4 feedstock or the C4 feedstock with an LB/IsoB index of less than 10% in the reactor while maintaining the reactor at a temperature above -15°C and utilizing a residence time less than 45 minutes to produce a crude PIB composition in a polymerization mixture; and (d) recovering a purified PIB composition from the polymerization mixture having a molecular weight, Mn, from 250 to 5000 Daltons and an alpha vinylidene content of at least 50 mol %. The crude PIB composition suitably has a fluoride content of less than 100 ppm and the purified PIB composition has a fluoride content of less than 20 ppm in preferred embodiments. In the most preferred embodiments, ammonium salts are used to neutralize the catalyst and fluoride salts are sublimed from the product at elevated temperatures.

Low-fluoride, reactive polyisobutylene

A method of making a low-fluoride reactive PIB composition incudes in one embodiment: a) providing an isobutylene-enriched C4 feedstock by way of blending a first mixed C4 feedstock with a second feedstock having a lower LB/IsoB index; (b) feeding the isobutylene-enriched C4 feedstock to a polymerization reactor with a catalyst complex comprising BF 3 and a modifier selected from alcohols, ethers and mixtures thereof; (c) polymerizing the isobutylene-enriched C4 feedstock in the reactor while maintaining the reactor at a temperature above -40°C and most preferably above -15°C and utilizing a residence time less than 45 minutes to produce a crude PIB composition in a polymerization mixture; and (d) recovering a purified PIB composition from the polymerization mixture having a molecular weight, Mn, from 250 to 5000 Daltons and an alpha vinylidene content of at least 50 mol %. The crude PIB composition suitably has a fluoride content of less than 100 ppm and the purified PIB composition has a fluoride content of less than 20 ppm. In another aspect, ammonium salts are used to neutralize the catalyst and fluoride salts are sublimed from the product at elevated temperatures.

Process for preparing water soluble polymers with no insoluble gels and low levels of residual monomers

The invention provides a method and apparatus for continuously feeding wet gel polymers into a drying step of a dry polymer synthesis operation. A number of pistons are arranged having inner chambers through which monomers and other reagents are fed and polymerized into wet gel polymers. Each piston operates according to a coordinated schedule so that as one piston finishes extruding polymer into the drying step, a second piston has completed polymerizing more polymer and continues to feed more polymer without interruption. The then finished is re-fed more reagents so as to be ready again when needed next. As a result, cost effective continuous feeding can be achieved without the contamination and impurity problems that have plagued previous attempts to accomplish this.

Superabsorbent production using particular conveying machines

적어도 하나의 이송 단계에서 트랙션 수단으로 기계적 연속 컨베이어의 그룹으로부터 이송 기계의 사용으로, 얻어진 입자 물질을 수송하기 위한 이송 단계를 포함하는, 초흡수체의 생산을 위한 공정은 개시된다. 바람직하게 사용된 이송 기계는 관형 드래그 컨베이어 및/또는 버킷 컨베이어이다. A process for the production of superabsorbents is disclosed, comprising a conveying step for conveying the obtained particulate material with the use of a conveying machine from a group of mechanical continuous conveyors as traction means in at least one conveying step. The conveying machines preferably used are tubular drag conveyors and/or bucket conveyors.

Highly absorbent resin and method for producing same

Superabsorbent resin and method for producing same

METHOD FOR PRODUCING HALOBUTIL RUBBERS NOT CONTAINING WATER AND SOLVENT

1. Способ удаления летучих соединений из жидкости (F), содержащей по меньшей мере один галогенированный бутиловый каучук и по меньшей мере одно летучее соединение, который предусматривает по меньшей мере следующие стадии:a) обработки жидкости (F) по меньшей мере в одной концентрирующей установке, содержащей по меньшей мере нагреватель (2), сосуд для дегазации (4) и испарительный трубопровод (4.1), при этом жидкость (F) нагревают, нагретую жидкость (G) подают в сосуд для дегазации (4), где часть летучих соединений удаляют через испарительный трубопровод (4.1) с получением концентрированной жидкости (Н),b) повторного нагревания концентрированной жидкости (Н) из стадии а) по меньшей мере в одной установке для повторного нагревания (6) с получением повторно нагретой концентрированной жидкости (L);c) подачи повторно нагретой концентрированной жидкости (L) из стадии b) по меньшей мере в один экструдерный узел, содержащий по меньшей мере секцию дегазации экструдера, содержащую по меньшей мере транспортирующую секцию (16), вентиляционное отверстие (15) с одним или более испарительными трубопроводами (15.1), накопительную секцию (20) и выпускную секцию (22), при этом летучие соединения удаляют через вентиляционные отверстия (15) и испарительные трубопроводы (15.1);при этом продукт (Р), полученный в выпускной секции (22), по существу не содержит летучих соединений.2. Способ по п.1, отличающийся тем, что повторно нагретая концентрированная жидкость (L) является свободнотекучей.3. Способ по п.1, отличающийся тем, что галогенированный бутиловый каучук представляет собой бромбутиловый каучук.4. Способ по п.1, отличающийся тем, что жидкость (F) содержит от 3 до 50%ма� РОССИЙСКАЯ ФЕДЕРАЦИЯ (19) RU (11) (13) 2012 144 960 A (51) МПК C08F 6/00 (2006.01) ФЕДЕРАЛЬНАЯ СЛУЖБА ПО ИНТЕЛЛЕКТУАЛЬНОЙ СОБСТВЕННОСТИ (12) ЗАЯВКА НА ИЗОБРЕТЕНИЕ (21)(22) Заявка: 2012144960/04, 23.03.2011 (71) Заявитель(и): ЛАНКСЕСС ИНТЕРНАСЬОНАЛЬ СА (CH) Приоритет(ы): (30) Конвенционный приоритет: 24.03.2010 EP ...

Continuous production method of water-absorbing polymer particles

Process for devolatilization of a polymer of an aromatic alkylene

本发明涉及一种芳族烯烃例如苯乙烯的聚合物的脱挥发分方法，具体地涉及一种使用水作为汽提剂的改进方法，(i)其中丢弃的水的总量可以减少，(ii)允许至少一部分水作为汽提剂再循环，降低了汽提剂的补给需求，和(iii)允许水中的至少一部分芳族烯烃单体再循环至聚合工艺(经由脱挥发分步骤)，而不是丢弃。

Superabsorbent polymer and method for preparing the same

本发明涉及超吸收性聚合物及用于制备其的方法，所述超吸收性聚合物不仅具有优异的吸收速率和负荷下吸收度，还具有优异的再润湿特性。

Method for preparing super absorbent polymer

본 발명은 고흡수성 수지의 제조 방법에 관한 것이다. 본 발명의 고흡수성 수지의 제조 방법에 따르면, 향상된 흡수 속도 및 용액 투과도를 가지면서도 보수능 또는 가압 흡수능의 저하가 없어 물성이 향상된 고흡수성 수지를 제공할 수 있다. The present invention relates to a method for producing a superabsorbent resin. INDUSTRIAL APPLICABILITY According to the method for producing a superabsorbent resin of the present invention, it is possible to provide a superabsorbent resin having improved water absorption properties and absorptive capacity or pressure absorption ability while having improved absorption rate and solution permeability.

Method for preparing super-absorbent resin

本发明涉及制备超吸收性聚合物的方法。根据制备超吸收性聚合物的方法，可以提供这样的超吸收性聚合物，其具有改善的吸收速率和溶液渗透率、具有改善的物理特性，并且保水能力或加压吸收能力不劣化。

The manufacturing method of super absorbent resin granule

本发明涉及一种吸水性树脂造粒体的制造方法。根据本发明的细粉末造粒体的制造方法可提供细粉末相互间的结合力优秀，从而能将再次破碎减到最少的造粒体。

Process for washing powdery and/or granular resins and a washing device therefor

ABSTRACT OF THE DISCLOSURE WASHING PROCESS FOR POWDERY AND/OR GRANULAR RESIN AND WASHING DEVICE FOR USE IN THE WASHING PROCESS A process for washing a powdery and/or granular resin involves bringing the powdery and/or granular resin into contact with a washing liquid in a counterflow fashion in a tubular body with a plurality of static mixing elements disposed continuously in series, thereby removing impurities adhering to the powdery and/or granular resin and producing the powdery and/or granular resin with a less content of impurities. A washing device for use with the washing process contains an tubular body in which the static mixing elements are disposed continuously in series, and this construction is simpler than conventional ones and does not require a stirring power and mechanism to remove the impurities from the powdery and/or granular resin.

Equipment for preparing polyolefin elastomer

본 발명은 폴리올레핀 엘라스토머 제조 설비에 관한 것으로, 본 발명에 따른 폴리올레핀 엘라스토머 제조 설비는 용매 및 원료를 공급받는 반응기, 상기 반응기로부터 배출되는 생성물을 탈휘발하여, 미반응물을 제거(1차 탈휘발 회수 흐름)하고, 그 나머지를 배출(1차 탈휘발 제조 흐름)하는 1차 탈휘발기, 상기 1차 탈휘발기로부터 배출되는 1차 탈휘발 제조 흐름을 재차 탈휘발하여, 미반응물을 더 제거(2차 탈휘발 회수 흐름)하고, 그 나머지를 배출(2차 탈휘발 제조 흐름)하는 2차 탈휘발기, 물을 이용해, 상기 2차 탈휘발기로부터 배출되는 2차 탈휘발 제조 흐름을 스크럽함으로써, 미반응물 및 물이 기화하고, 고분자 제품이 잔류하게 되는 피니셔 및 상기 1차 탈휘발기에서 제거되는 1차 탈휘발 회수 흐름으로부터 저분자 물질을 제거(불순물 제거 흐름)하고, 그 나머지를 상기 반응기로 회수하는 플래시 드럼을 포함할 수 있다.

process for preparing solid acrylic acid polymers, and at least partially neutralized aqueous acrylic acid polymer solution.

a invenção refere-se a um processo para produzir polímeros de ácido acrílico sólidos, compreendendo as etapas de: (a) preparação de uma solução aquosa de polímero de ácido acrílico tendo um teor de sólidos de 30% a 70% em peso por polimerização de radicais livres, (b) pelo menos neutralização parcial da solução aquosa de polímero de ácido acrílico pela adição de uma base, de modo que o calor da neutralização seja liberado, e concentração da solução aquosa de polímero de ácido acrílico usando o calor de neutralização para formar uma solução de polímero de ácido acrílico altamente concentrada tendo um teor de sólidos de 60% a 80% em peso, (c) moldagem e secagem da solução de polímero de ácido acrílico altamente concentrada.

Articles of reclaimed polyethylene compositions

An article is disclosed that comprises at least about 95 weight percent reclaimed polyethylene base resin. The base resin comprises less than about 10 ppm Al, less than about 200 ppm Ti, and less than about 5 ppm Zn. The article is substantially free of odor and the base resin has a contrast ratio opacity of less than about 70%.

Reclaimed polyethylene composition

A composition is disclosed that comprises at least about 95 weight percent reclaimed polyethylene. The reclaimed polyethylene comprises less than about 10 ppm Al, less than about 200 ppm Ti, and less than about 5 ppm Zn. The reclaimed polyethylene has a contrast ratio opacity of less than about 70% and the composition is substantially free of odor.

Reclaimed polypropylene composition

A composition is disclosed that comprises at least about 95 weight percent reclaimed polypropylene. The reclaimed polypropylene comprises less than about 10 ppm Al, less than about 5 ppm Ti, and less than about 5 ppm Zn. The reclaimed polypropylene has a contrast ratio opacity of less than about 15% and the composition is substantially free of odor.

Method for producing water-absorbing resin

Method for producing water absorbent resin

工業的に高物性の吸水性樹脂特に高通液性の吸水性樹脂を安定的に連続生産する吸水性樹脂の製造方法が提供される。本発明の方法は、不飽和単量体水溶液の重合工程、得られた含水ゲル状重合体の乾燥工程、乾燥後の表面架橋工程を含む吸水性樹脂の製造方法であって、吸水性樹脂粉体を内面の表面粗さ（Ｒｚ）が８００ｎｍ以下の配管中を露点−５℃〜−１００℃の気体で空気輸送する空気輸送工程を含むことを特徴とする。 Provided is a method for producing a water-absorbent resin that stably and continuously produces a water-absorbent resin having high physical properties, particularly a highly water-permeable water-absorbent resin. The method of the present invention is a method for producing a water-absorbent resin comprising a polymerization step of an unsaturated monomer aqueous solution, a drying step of the obtained hydrogel polymer, and a surface cross-linking step after drying. It includes an air transportation step of pneumatically transporting the body with a gas having a dew point of −5 ° C. to −100 ° C. in a pipe having an inner surface roughness (Rz) of 800 nm or less.

Process for producing polyvinyl chloride particles for producing chlorinated polyvinyl chloride

본 발명은 개선된 염소화 효율을 제공하는, 폴리비닐 클로라이드의 입자를 제공하는 방법으로서, 이 방법은 (i) 폴리비닐 클로라이드 입자를 제공하는 단계; 및 (ii) 염소화 촉진제를 폴리비닐 클로라이드 입자로 도입함으로써 함께 회합된 촉진제를 갖는 폴리비닐 클로라이드 입자를 제공하는 단계를 포함한다.

Process for producing superabsorbers

本发明涉及一种通过使单体溶液或悬浮液聚合来制备超吸收剂颗粒的方法，所述方法包括以下步骤：在冷却的同时连续预中和单体并将预中和的单体部分再循环至所述预中和中，通过热交换器连续加热预中和的单体，并连续再中和加热的单体，其中所述单体溶液或悬浮液在进入聚合反应器之前的温度为70℃至99℃，并且热交换器中所使用的加热介质的温度小于160℃。

Method for the Continuous Production of Crosslinked Particulate Gel-Type Polymers

Disclosed is a method for the continuous production of crosslinked, particulate, gel-type polymers by copolymerizing a) water-soluble, monoethylenically unsaturated monomers, b) 0.001 to 5 molar percent of monomers containing at least two polymerizable groups, the percentage being relative to the monomers (a), in a mixer. The substances that are added at the beginning of the kneader are conveyed in an axial direction towards the end of the mixer. The inventive method is characterized in that at least one of the following conditions is met: i) the filling level in the kneader mixer is at least 71 percent; ii) the water-soluble, monoethylenically unsaturated monomers contain up to 150 ppm of a semicyclic ether of a hydroquinone; iii) the temperature in the polymerization zone exceeds 65° C.; iv) the kneader has a remixing rate of less than 0.33.

Method for producing crosslinked fine gel polymer

In the continuous preparation of finely divided, gel-form, crosslinked polymers (I) by copolymerizing water-soluble mono-ethylenically unsaturated monomers (II) with 0.001-5 mol. % (based on (II)) of monomers (III) containing at least two polymerizable groups in a kneader through which materials are transported axially, (a) the degree of filling of the kneader is at least 71%, (b) (II) contains up to 150 ppm hydroquinone hemi-ether (IV), (c) the polymerization zone temperature is more than 65[deg]C and/or (d) the kneader has back mixing ratio less than 0.33.

Method for the continuous production of crosslinked particulate gel-type polymers

本发明公开了一种通过在混合器中使如下单体共聚而连续生产交联的、粒状凝胶型聚合物的方法：a)水溶性单烯属不饱和单体，b)0.001-5mol％的包含至少两个可聚合基团的单体，其中百分数基于单体(a)。在捏合机起始处加入的物质沿轴向输送至该混和器的末端。本发明方法的特征在于满足至少一个以下条件：i)捏合机混合器中的填充水平为至少71％，ii)水溶性单烯属不饱和单体含有至多150ppm氢醌半醚；iii)聚合区的温度超过65℃；iv)捏合机的返混比低于0.33。

Method for the continuous production of crosslinked particulate gel-type polymers

Disclosed is a method for the continuous production of crosslinked, particulate, gel-type polymers by copolymerizing a) water-soluble, monoethylenically unsaturated monomers, b) 0.001 to 5 molar percent of monomers containing at least two polymerizable groups, the percentage being relative to the monomers (a), in a mixer. The substances that are added at the beginning of the kneader are conveyed in an axial direction towards the end of the mixer. The inventive method is characterized in that at least one of the following conditions is met: i) the filling level in the kneader mixer is at least 71 percent; ii) the water-soluble, monoethylenically unsaturated monomers contain up to 150 ppm of a semicyclic ether of a hydroquinone; iii) the temperature in the polymerization zone exceeds 65 °C; iv) the kneader has a remixing rate of less than 0.33.

Process for the continuous preparation of cross-linked gelatinous polymers with a small particle size

Continuous production of crosslinked fine particles of addition-polymer gel

Process for producing water-absorbing resin

The disclosed process for producing a water-absorbing resin comprising: a polymerization step of polymerizing an aqueous unsaturated monomer; a drying step of drying a particulated water-containing gel-liked crosslinked polymer, obtained in a finely crushing step during the polymerization or after the polymerization; a pulverizing step after the drying, a classification step after the drying, and a surface treatment step after the classification. In the process is, the surface-treatment step is interrupted with a heating treatment apparatus kept in a heated state and thereafter the surface treatment step is restarted.

Process for the production of sap

Process for the continuous preparation of cross-linked gelatinous polymers with a small particle size

Process for the continuous preparation of cross-linked gelatinous polymers with a small particle size

In the continuous preparation of finely divided, gel-form, crosslinked polymers (I) by copolymerizing water-soluble mono-ethylenically unsaturated monomers (II) with 0.001-5 mol. % (based on (II)) of monomers (III) containing at least two polymerizable groups in a kneader through which materials are transported axially, (a) the degree of filling of the kneader is at least 71%, (b) (II) contains up to 150 ppm hydroquinone hemi-ether (IV), (c) the polymerization zone temperature is more than 65[deg]C and/or (d) the kneader has back mixing ratio less than 0.33.