НОВЫЕ АНТИАГЛОМЕРАТОРЫ ДЛЯ ЭЛАСТОМЕРНЫХ СОПОЛИМЕРОВ ЭТИЛЕНА И α-ОЛЕФИНА

Изобретение относится к способу получения частиц эластомера из водной суспензии, содержащей множество частиц эластомера, имеющего размер частиц 0,05-25 мм, суспендированные в ней. Органическая среда содержит по меньшей мере один эластомерный сополимер этилена и α-олефин и органический разбавитель. Органическая среда контактирует с водной средой, содержащей по меньшей мере одно соединение с Нижней Критической Температурой Растворения (НКТР), имеющее точку помутнения 0-100°C, выбранное из метилцеллюлозы, гидроксипропилцеллюлозы, гидроксиэтилметилцеллюлозы, гидроксипропилметилцеллюлозы. Затем удаляют по меньшей мере частично органический разбавитель с получением водной суспензии, содержащей частицы эластомерного сополимера этилена и α-олефина. После чего отделяют частицы эластомерного сополимера этилена и α-олефина, содержащиеся в водной суспензии, получают выделенные частицы эластомерного сополимера этилена и α-олефина, сушат выделенные частицы эластомера и формуют получением частиц эластомера ...

КРИСТАЛЛИЗУЮЩИЙ КОНВЕЙЕР

... 1. Способ кристаллизации множества полимерных гранул, включающий ! а) подачу множества полимерных гранул на вход пневматической конвейерной системы, при этом множество полимерных гранул содержит кристаллизуемый полимер, имеющий температуру кристаллизации и температуру плавления, и ! b) пневматический перенос множества полимерных гранул от входа к выходу транспортным газом, при этом транспортный газ имеет температуру, достаточную для поддержания температуры множества полимерных гранул в таком диапазоне, чтобы кристаллизация множества полимерных гранул по существу была инициирована или завершена до извлечения гранул из выхода пневматической конвейерной системы. ! 2. Способ по п.1, где часть множества гранул имеет сферическую форму или цилиндрическую форму. ! 3. Способ по п.1, где множество полимерных гранул содержат компонент, выбранный из группы, включающей сложный полиэфир, полиолефины, полистиролы, нейлоны и поликетоны. ! 4. Способ по п.3, где сложным полиэфиром является полимер или сополимер ...

СЕПАРАТОР С ВСТРОЕННЫМИ РАЗРЫВНЫМИ МЕМБРАНАМИ ДЛЯ РАЗДЕЛЕНИЯ КОМПОНЕНТОВ РЕАКЦИОННОЙ СМЕСИ, ПОЛУЧЕННОЙ В РЕЗУЛЬТАТЕ ПОЛИМЕРИЗАЦИИ ПОД ВЫСОКИМ ДАВЛЕНИЕМ ЭТИЛЕННЕНАСЫЩЕННЫХ МОНОМЕРОВ

РОССИЙСКАЯ ФЕДЕРАЦИЯ (19) RU (11) (13) 2016 126 001 A (51) МПК B01J 3/00 (2006.01) ФЕДЕРАЛЬНАЯ СЛУЖБА ПО ИНТЕЛЛЕКТУАЛЬНОЙ СОБСТВЕННОСТИ (12) ЗАЯВКА НА ИЗОБРЕТЕНИЕ (21)(22) Заявка: 2016126001, 15.12.2014 (71) Заявитель(и): БАЗЕЛЛ ПОЛИОЛЕФИН ГМБХ (DE) Приоритет(ы): (30) Конвенционный приоритет: 19.12.2013 EP 13198363.7 (85) Дата начала рассмотрения заявки PCT на национальной фазе: 19.07.2016 R U (43) Дата публикации заявки: 24.01.2018 Бюл. № 03 (72) Автор(ы): НОЙМАН Эрих (DE), КАЙРУЛЛИН Данир (DE), ФИБЛА Клаудио (DE) (86) Заявка PCT: (87) Публикация заявки PCT: WO 2015/091384 (25.06.2015) R U (54) СЕПАРАТОР С ВСТРОЕННЫМИ РАЗРЫВНЫМИ МЕМБРАНАМИ ДЛЯ РАЗДЕЛЕНИЯ КОМПОНЕНТОВ РЕАКЦИОННОЙ СМЕСИ, ПОЛУЧЕННОЙ В РЕЗУЛЬТАТЕ ПОЛИМЕРИЗАЦИИ ПОД ВЫСОКИМ ДАВЛЕНИЕМ ЭТИЛЕННЕНАСЫЩЕННЫХ МОНОМЕРОВ (57) Формула изобретения 1. Сепаратор, работающий под давлением от 10 МПа до 50 МПа, состав, содержащий жидкие компоненты и газообразные компоненты в жидкой фракции и газовой фракции, отличающийся тем, что: сепаратор имеет цилиндрическую форму и устанавливается вертикально; сепаратор в верхней части имеет люк, окруженный утолщенной частью стенки сепаратора; сепаратор оснащен устройствами ввода состава в сепаратор, устройствами отбора газовой фракции с верхней части сепаратора и устройствами отбора жидкой фракции с нижней части сепаратора; и сепаратор содержит, по меньшей мере, одну разрывную мембрану, удерживаемую держателем разрывной мембраны, которая герметично установлена в отверстии утолщенной части стенки сепаратора. 2. Сепаратор по п. 1, отличающийся тем, что держатель разрывной мембраны установлен вертикально в утолщенной части стенки сепаратора. 3. Сепаратор по п. 1 или 2, отличающийся тем, что держатель разрывной мембраны крепится к стенке сепаратора фланцевым соединением с внешней стороны. 4. Сепаратор п. 1, отличающийся тем, что разрывной диск устанавливается на Стр.: 1 A 2 0 1 6 1 2 6 0 0 1 A Адрес для переписки: 123242, Москва, пл. Кудринская, д. 1, а/я 35, "Михайлюк, Сороколат и ...

СПОСОБ ДОЗИРОВАНИЯ ДОБАВОК В РАСПЛАВЫ ПОЛИМЕРОВ

... 1. Способ очистки полимера или полимерной смеси, в которую вводят в расплавленном состоянии под давлением прежде всего десорбционный агент, который тонко распределяют в расплаве и который затем вновь удаляют под вакуумом в дегазационной камере, причем при этом отпаривают также другие летучие материалы, в частности моно-, ди- и/или тримеры, которые содержатся после получения полимера или полимерной смеси, отличающийся тем, что с десорбционным агентом, вводимым в расплав, смешивают одну или несколько добавок. 2. Способ по п.1, отличающийся тем, что полимер или полимерная смесь представляет собой термопластичную смолу, предпочтительно с полистиролом в качестве основного компонента. 3. Способ по п.1, отличающийся тем, что добавки представляют собой один или несколько из антипиренов, смазок, антиоксидантов, пластификаторов, пигментов, модификаторов ударной прочности, нанокомпозитов, углерода в различных модификациях, красителей и антистатиков. 4. Способ по п.1, отличающийся тем, что добавку ...

Verfahren und Vorrichtung zum Führen und Reinigen einer Polymerschmelze

Die Erfindung betrifft ein Verfahren und eine Vorrichtung zum Führen und Reinigen einer Polymerschmelze innerhalb einer Schmelzeleitung. Hierbei wird die Polymerschmelze unter einem Überdruck in einer Fließrichtung durch die Schmelzeleitung geführt. Dabei werden die insbesondere bei längeren Verweilzeiten im Randbereich auftretenden Abbauprodukte der Polymerschmelze über eine Entnahmestelle am Umfang der Schmelzeleitung als eine Teilmenge der Polymerschmelze zu einer Behandlung entnommen.

Verfahren zur Herstellung von Ethylen-Vinylalkohol-Copolymerharz, Verfahren zur Herstellung von Pellets und Harzpellets

Polymeric materials

Metals recovery method and polymer for use in metals re-covery and process for making such a polymer

A process of forming a porous polymer template material comprising poly­merising a monomer admixed with a compound of the metal to be recovered, followed by treatment of the polymer to remove the metal compound. The metal to be recovered may be rhenium and the metal compound ammonium perrhenate. The polymer may be formed by cross-linking a monomer, such as vinylpyridine, in the presence of a porogen, such as chloroform, and a metal salt. The metal can then be removed by treatment with acid to give the polymer template material. Once formed the polymer template may be comminuted. A method of selectively recovering a metal from a solution containing the metal ions comprises contacting the aforementioned porous polymer template material with the solution containing the metal ions, and recovering the metal from the polymer by treatment with hydrochloric acid.

Process for the purification of a solid thermoplastic polymer or copolymer

A process for the purification of solid thermoplastic polymer or copolymer material comprises dissolving the polymer in an organic solvent at a temperature above the normal boiling point of the solvent and under a pressure sufficient to prevent the solvent boiling; removing undissolved impurities from the resulting solution by filtration; adding to the solution a liquid which is miscible with the solvent but not with the polymer to precipitate the polymer in a purified state; and thereafter recovering the precipitated polymer. Polymers specified are vinyl chloride homopolymers and copolymers with vinyl acetate or vinylidene chloride and home- and co-polymers of methyl methacrylate. Solvents specified are acetone, methyl ethyl ketone, cyclohexanone, dichloromethane and dichloroethane. Specified precipitants are C5-7 paraffin hydrocarbons and alcohols, which may be diluted with water.

CLEANING METHOD FOR ALKOXYSTYROLPOLYMERE

PROCEDURE FOR METERING FROM ADDITIVES TO POLYMER MELTS

PROCEDURE FOR THE PRODUCTION OF AETHYLENPOLYMEREN AND DEVICE FOR THE EXECUTION OF THIS PROCEDURE.

PROCEDURE FOR REMOVING FROM REMAINDER SOLVENTS AND REMAINDER MONOMERS FROM POWDERED POLYMERS

POLYMER DEGASSING

ORTHOPAEDIC DEVICE AND METHOD FOR MAKING SAME

DEVOLATILISING POLYMER MELT

HIGH PERFORMANCE P(VDF-TRFE) COPOLYMER FOR PYROELECTRIC CONVERSION

A process for purifying a P(VDF-TrFE) copolymer to produce an improved high performance copolymer for pyroelectric conversion. Pellets of a P(VDF-TrFE) copolymer are dissolved in a solvent to form a solution. Subsequently, anhydrous ethanol is added to the solution to initiate copolymer gel precipitation, after which the solution is separated to obtain the gel precipitate, which is subsequently washed and dried. The resulting copolymer has fewer impurities and higher resistivity, thereby being suitable for use in applications such as pyroelectric converters. The purified copolymer also exhibits phase transition characteristics that allow for increased power output.

PROCESS FOR THE PREPARATION OF POLYMER MELTS WHICH ARE SUBSTANTIALLY FREE OF VOLATILE COMPONENTS

A process for the preparation of alkene polymer melts being substantially free of volatile components comprises introducing an alkene polymer melt having a melt index of less than 4 dg/min and a content of volatile components of less than 10 percent by weight into a cooled degasification extruder and subjecting the melt in the extruder kneading zone to intense cooling under pressure and in the extruder degasification zone to cooling which is less intense than in the kneading zone and under reduced pressure.

PROCESS AND DEVICE FOR MANUFACTURING ETHYLENE POLYMERS

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.

DEVOLATILIZATION

A polymer melt may be devolatilized to less than 500, preferably less than 150 ppm of residual volatile material by injecting into the melt an amount of a super critical fluid greater than the amount of residual volatile material in the melt, typically not more than about 10 weight %, and passing the melt through a flash chamber devolatilizer at a pressure of 1.6 X 103 Pascals (Pa) (12 mm of Hg) or less at a temperature of from 200.degree.C to 350.degree.C.

Procédé et appareil pour l'élimination de matières volatiles d'une composition à l'état de liquide épais ou pâteux

Verfahren zur Verbesserung der Hitzebeständigkeit und Lichtstabilität von a-Alkylstyrolen und Alkylmethacrylaten

Control methods and systems for polmer product purge

本文公开了净化聚合物产品中挥发物的方法和系统。该方法和系统尤其可用于净化在流化床反应器中生产的聚乙烯聚合物产品。

Improved method to separate and recover oil and plastic from plastic contaminated with oil

A method for removing contaminants from synthetic resin material containers using a first organic solvent system and a second carbon dioxide system. The organic solvent is utilized for removing the contaminants from the synthetic resin material and the carbon dioxide is used to separate any residual organic solvent from the synthetic resin material.

Process and device of treatment of a plastic to eliminate from it lesgaz and/or occluded volatile substances

Process for the improvement of the properties of the polystyrene or the copolymérisats of system

Degassing vinyl choride bulk (co)polymerisation prods. - with rapid initial decrease in press. giving lower residual monomer content

PROCESS FOR REMOVAL OF VOLATILE COMPONENT FORM METHACRYLATE POLYMER COMPOSITION

Removing residual vinyl chloride monomer from polymerisation system - followed by adding water contg. nonionic surfactant to polymer

MANUFACTORING PROCESS OF THERMOPLASTIC MASSES OF MOULDING CONTAINING VINYL POLYMERS

다공성 소프트 비드 및 이의 제조방법

... 본 발명은 다공성 소프트 비드 및 이의 제조방법에 관한 것으로, 더욱 상세하게는 10 내지 50%의 회복율을 가져 소프트한 특성을 갖고 흡유성이 우수한 다공성 소프트 비드 및 이의 제조방법에 관한 것이다. 본 발명에 따른 다공성 소프트 비드는 우수한 회복율로 인해 탄성이 우수하여 발림성이 우수하여 화장품의 재료로 유용하게 사용될 수 있으며, 특히 흡유량이 우수하면서도 수분 흡수가 적어 우수한 보습력을 제공할 수 있으므로, 화장품 조성물로 유용하게 사용될 수 있다.

SUPER ABSORBENT POLYMER

POROUS SOFT BEAD AND PRODUCTION METHOD THEREOF

The present invention relates to a porous soft bead and a production method thereof, and more specifically, to a porous soft bead having 10-50% of a recovery rate and thus exhibiting softness and excellent oil absorption, and also to a production method thereof. According to the present invention, the porous soft bead has excellent spreading property and elasticity due to a high recovery rate, thereby being useful for a cosmetic materials, and especially has excellent oil absorption and low moisture absorption to provide excellent moisturizing ability, thereby being useful for a cosmetic composition. COPYRIGHT KIPO 2017 (AA) C.V value: 29.7% ...

METHOD FOR STEREOSPECIFICALLY RECYCLING A PLA POLYMER MIXTURE

APPARATUS AND METHOD OF SEPARATING A POLYMER FROM A SOLVENT

The present invention relates to various embodiments of a system and method for separating polymer from a solvent. In one embodiment a system for separating polymer from a solvent comprises an extrusion apparatus includes a hollow member having a first end portion, a second end portion, and a feed port between the first end portion and the second end portion. The extrusion apparatus includes a back flash vent port disposed upstream of the feed port and a forward flash vent port disposed downstream of the feed port. The extrusion apparatus further includes a vent insert located at the forward flash vent port, a screw disposed inside the hollow member, and an internal superheating section disposed between the feed port and the downstream vent opening of the hollow member such that the length of the internal superheating section is greater than about four times the diameter, 4D, of the hollow member.

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.

METHOD FOR THERMAL SEPARATION OF A VOLATILE SUBSTANCE FROM A NON- OR LESS VOLATILE SUBSTRATE

In a method for the thermal separation of a volatile substance from a non- or less volatile substrate having a phase boundary towards a gas chamber that receives the volatile substance subsequent to vaporisation and/or sublimation, mechanical energy is supplied to the phase boundary between the substrate and the gas chamber to increase the material exchange of the volatile substance. In the process, the material exchange is increased by the addition of an additive or mechanical energy to the surface of the phase transition in such manner that said supplied mechanical energy destroys bubbles containing the volatile substrate, so that the volatile substrate can escape to the gas chamber.

METHOD OF PURIFYING POWDERY RESIN

A method of powdery-resin purification in which a powdery resin obtained by precipitation polymerization is purified by efficiently removing the residue of an organic solvent used as a polymerization solvent from the powdery resin. The method for powdery-resin purification comprises: a step (A) in which a gas containing the vapor of a polar solvent (e.g., water vapor, ethanol vapor, or 1-propanol vapor) is brought into contact with a powdery resin obtained by polymerizing a hydrophilic monomer (e.g., acrylic acid) by precipitation polymerization in an organic solvent (e.g., cyclohexane) in which the hydrophilic monomer is soluble and the polymer to be formed from the hydrophilic monomer is insoluble; and a step (B) in which the powdery resin is heated. By the method, the residual organic solvent can be efficiently extracted and removed while maintaining the powdery state of the resin.

Modified polyolefin resin for glass fiber treatment, surface-treated glass fiber, and fiber-reinforced polyolefin resin

An acid-modified polyolefin-based resin for glass fiber treatment having: (1) an amount of components extractable with boiling methyl ethyl ketone of 8 mass % or less; (2) a number average molecular weight (Mn), measured by gel permeation chromatography (GPC), of 6,000 to 48,000; and (3) an amount of an acid which has been added, measured by Fourier transform infrared spectroscopy, of 0.1 to 12 mass %.

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

METHOD FOR PREPARING SUPERABSORBENT RESIN, AND SUPERABSORBENT RESIN

СПОСОБ ПОЛУЧЕНИЯ АРОМАТИЧЕСКОГО АЛКИЛЕНОВОГО ПОЛИМЕРА И УСТРОЙСТВО ДЛЯ ЕГО ОСУЩЕСТВЛЕНИЯ

Изобретение относится к области химии полимеров, а именно к способу непрерывного получения ароматического алкиленового полимера, например стирола. Способ включает полимеризацию ароматического алкилена в массе, в результате чего образуется масса полимерного расплава, которую затем подвергают обработке для удаления летучих продуктов в по меньшей мере две последовательные стадии таким образом, чтобы отделить полимер от непрореагировавшего мономера и олигомеров, по меньшей мере частично образующихся во время полимеризации. Этот способ включает подачу первого газообразного потока, выделенного из полимера на первой стадии удаления летучих продуктов в первую зону Z1 для прямой конденсации и фракционирования, отведение из верхней части Z1 газообразного потока G1, включающего по существу мономер, и отведение жидкого потока L1 из основания Z1, богатого олигомерами, причем порцию этого жидкого потока L1 отбирают, охлаждают и затем возвращают в Z1 таким образом, что благодаря вхождению в прямой контакт ...

СЕПАРАТОР С ВСТРОЕННЫМИ РАЗРЫВНЫМИ МЕМБРАНАМИ ДЛЯ РАЗДЕЛЕНИЯ КОМПОНЕНТОВ РЕАКЦИОННОЙ СМЕСИ, ПОЛУЧЕННОЙ В РЕЗУЛЬТАТЕ ПОЛИМЕРИЗАЦИИ ПОД ВЫСОКИМ ДАВЛЕНИЕМ ЭТИЛЕННЕНАСЫЩЕННЫХ МОНОМЕРОВ

Группа изобретений относится к сепаратору, работающему под давлением от 10 МПа до 50 МПа для разделения состава, содержащего жидкие компоненты и газообразные компоненты, на жидкую фракцию и газовую фракцию, способу разделения при давлении от 10 МПа до 50 МПа указанного состава и способу получения гомополимеров этилена или сополимеров из этиленненасыщенных мономеров в присутствии катализаторов полимеризации со свободными радикалами при температурах от 100°С до 350°С и давлении в пределах от 110 МПа до 500 МПа в реакторе полимеризации. Сепаратор имеет цилиндрическую форму и устанавливается вертикально, в верхней части имеет люк, окруженный утолщенной частью стенки сепаратора. Сепаратор оснащен устройствами ввода состава в сепаратор, устройствами отбора газовой фракции с верхней части сепаратора и устройствами отбора жидкой фракции с нижней части сепаратора. Сепаратор также содержит по меньшей мере одну разрывную мембрану, удерживаемую держателем разрывной мембраны, который герметично установлен в отверстии утолщенной части стенки сепаратора. Способ разделения при давлении от 10 МПа до 50 МПа состава, содержащего жидкие компоненты и газообразные компоненты, на жидкую фракцию и газовую фракцию, осуществляемый в сепараторе вышеуказанной конструкции, включает следующие стадии: подачу реакционной смеси в сепаратор, разделение реакционной смеси на газовую фракцию и жидкую фракцию, отбор газовой фракции из верхней части сепаратора и отбор жидкой фракции из нижней части сепаратора. В способе получения гомополимеров этилена или сополимеров из этиленненасыщенных мономеров в присутствии катализаторов полимеризации со свободными радикалами при температурах от 100°С до 350°С и давлении в пределах от 110 МПа до 500 МПа в реакторе полимеризации разделение реакционной смеси, полученной при полимеризации, осуществляется в сепараторе вышеуказанной конструкции. Техническим результатом является предотвращение образования застойного пространства и упрощение конструкции сепаратора. 3 н. и ...

PROCESS FOR TRANSFERRING SOLIDS

Process for purification of polyethylene crude scale wax of low molecular weight

Polyethylene crude scale waxes are purified by liquifying by heating to 100 DEG to 300 DEG C. in a closed vessel, not subject to pressure but having a protective gas atmosphere, and then separating the liquid by separately discharging the portion containing the impurities and the portion containing the pure polyethylene scale wax.

Process for devolatilizing polymeric materials

Molten polymers containing volatile constituents are devolatilized by feeding the molten polymer at a velocity of 0.1-15 ft./min. through a confined devolatilization zone and at a pressure of up to 200 mm. Hg applied to the exit of this zone, whereby a foam is formed containing bubbles of the volatile constituents removed from the polymer, passing the foam into a phase separation zone which is in open communication with the devolatilization zone, separating a gas phase resulting from the collapse of the foam and recovering the devolatilized polymer which has been maintained in a molten condition throughout the process. The polymer may be polystyrene which may be modified with a rubber, e.g. rubbery styrene/butadiene copolymers, or an acrylonitrile/styrene copolymer or an acrylonitrile/butadiene/styrene terpolymer. The polymer may be fed into the devolatilization zone at a temperature of at least 160 DEG C. and the gas separated may be withdrawn and recovered in a condensing ...

Improved method for devolatilizing polymeric compositions

Synthetic vinylidene polymers and copolymers are devolatilized from unpolymerized monomer and low molecular weight polymers, by feeding the polymer at devolatilizing temperature into a chamber having a condensing surface maintained at a temperature greater than the condensing temperature of the low molecular weight polymers under pressure, and withdrawing pure monomer vapours from the chamber; withdrawing the condensed low molecular weight polymers as a liquid from the condensing surface; and withdrawing the devolatilized polymer from the chamber. Polymers mentioned are those derived from styrene, b -methyl styrene, vinyl toluene, mono- and dichlorostyrene and ar-dimethyl styrene, their copolymers and graft copolymers, and in an example, polystyrene containing styrene and less than 1% polymers with less than a M.W. of 300, is devolatilized in a chamber at between 100 and 150 mm. absolute and with a condensing surface at between 37 DEG and 52 DEG C. Suitable apparatus is described and claimed ...

LINEAR LOW DENSITY POLYETHYLENE

PROCEDURE FOR THE PRODUCTION OF ETHYL VINYLALKOHOL COPOLYMERHARZ, PROCEDURES FOR THE PRODUCTION OF PELLETS AND RESIN PELLETS

Procedure for removing volatile components from purify-hasty Olefinpolymerisaten

PRODUCTION OF ULTRAREINEN POLYMER ARTICLES

PROCEDURE FOR THE PRODUCTION OF WATER-ABSORBING POLYMER PARTICLES

PROCEDURE FOR THE PRODUCTION OF AMORPHOUS ALPHAOLEFIN POLYMERS.

PROCEDURE FOR CLEANING KREISLAUFGASEN CONDENSED POLYMER PARTICLES

REMOVAL OF RESIDUAL CATALYST FORM POLYOLEFINS

SOLIDS FEEDING APPARATUS

PURIFICATION OF ZIEGLER POLYPROPYLENE

Improvements in or relating to the Removal of Volatile Substances from Viscous Compositions

HIGH PERFORMANCE P(VDF-TRFE) COPOLYMER FOR PYROELECTRIC CONVERSION

A process for purifying a P(VDF-TrFE) copolymer to produce an improved high performance copolymer for pyroelectric conversion. Pellets of a P(VDF-TrFE) copolymer are dissolved in a solvent to form a solution. Subsequently, anhydrous ethanol is added to the solution to initiate copolymer gel precipitation, after which the solution is separated to obtain the gel precipitate, which is subsequently washed and dried. The resulting copolymer has fewer impurities and higher resistivity, thereby being suitable for use in applications such as pyroelectric converters. The purified copolymer also exhibits phase transition characteristics that allow for increased power output.

LINEAR LOW DENSITY POLYETHYLENE PROCESS

ABSTRACT OF THE DISCLOSURE In the production of linear low density polyethylene in a high pressure tubular reaction zone using a solid supported transition metal catalyst, plugging of equipment downstream of the reaction zone is prevented by the addition of an antifoam agent to the reaction zone effluent at a location upstream of the high pressure separation zone employed in separating unreacted monomer from the polymer.

CENTRIFUGAL METHOD AND APPARATUS FOR DEVOLATILIZING POLYMERS

A method for devolatilization of a thermoplastic polymer containing at least one volatile component which includes the following three steps: heating the termoplastic polymer so that the thermoplastic polymer is a heated liquid or molten thermoplastic polymer, flowing the heated liquid thermoplastic polymer through a packed bed liquid-gas contactor by centrifugal force, and flowing a stripping gas through the packed bed countercurrent to the flow of the heated liquid thermoplastic polymer so that the volatile component volatilizes into the stripping gas from the heated liquid thermoplastic polymer by gas-liquid contacting in the packed bed; and an apparatus therefor.

CRYSTALLIZING CONVEYOR

A method of crystallizing a plurality of polymeric pellets includes a ste p of introducing the pellets into a pneumatic conveying system with an initi al average temperature. The plurality of polymeric pellets are pneumatically transferred from the inlet to an outlet with a conveying gas. While residin g within the conveying system, the pellets have a sufficient temperature for crystallization to occur. A pneumatic conveying system implementing the met hods of the invention is also provided.

METHOD FOR REMOVING MERCAPTANS

METHOD FOR REMOVING MERCAPTANS Mercaptans are removed from materials such as acrylates containing the same as an impurity with efficiency by treating the materials with lead compounds and/or copper compounds at 0-60.degree.C.

METHOD OF TREATING POLYOLEFIN

A method of treating polyolefin comprises (i) a ligand-decomposition step of contacting polyolefin, which is obtained by the use of a transition metal compound containing ligands having cyclopentadienyl skeleton, with a ligand decomposer, such as water, oxygen, alcohol, alkylene oxide or peroxide, to decompose the ligands contained in the polyolefin, and (ii) a ligand-removal step of heating the polyolefin contacted with the ligand decomposer to remove the decomposed ligands from the polyolefin. According to this method, the residual ligands having cyclopentadienyl skeleton, which are contained in the polyolefin produced by the use of a transition metal compound containing ligands having cyclopentadienyl skeleton, are decomposed and removed from the polyolefin, whereby polyolefin diminished in odor development in the molding process can be obtained.

Process for the purification of mixtures of molecular in particular low-weight polyethylene, as well as the products in conformity with those obtained by this process or similar process

PROCESS FOR REMOVAL OF VOLATILE COMPONENT FORM METHACRYLATE POLYMER COMPOSITION

Improvements in or relating to the Removal of Volatile Substances from Viscous Compositions

Process of copolymer devolatilisation of alpha-alcoyl styrenes and alkyl methacrylates by extrusion

REMOVING VOLATILE CONSTITUENTS FROM PARTICULATE OLEFIN POLYMERS PRODUCED BY GAS-PHASE POLYMERIZATION

Improvements with the preparation of polymers of propylene, and produced obtained

PROCESS FOR PURIFICATION OF ALKOXYSTYRENE POLYMERS

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 TO REMOVE CONTAMINANTES OF A POLYMER FLOWING OFF

Methods for modifying the rheology of polymers

PACKAGE FOR GROUPS OF PELLETS OF ETHYLENE-VINYL ESTER COPOLYMER SAPONIFICATION PRODUCT OR RESIN COMPOSITION THEREOF

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.

Purification means

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

Process and device for manufacturing an aromatic alkylene polymer

The present invention relates to a process and a device for the continuous manufacture of a polymer of an aromatic alkylene monomer e.g. styrene comprising a bulk polymerisation of the monomer and a devolatilization of the resulting polymer in at least two successive steps so as to separate the polymer from the unreacted monomer and the oligomers formed during the polymerisation. The process comprises conveying a first gas stream resulting from the first step of the devolatilization into a first zone Z1 for direct condensation and fractionation, removing a gas stream G1 comprising essentially the monomer from the top of Z1, and removing a liquid stream L1 rich in oligomers from the bottom of Z1, a portion of L1 being taken, cooled and then returned into Z1. It also comprises conveying a second gas stream resulting from the second step of the devolatilization into a second zone Z2 for direct condensation and fractionation, this zone being also fed with the other portion of L1, removing a ...

Process for preparing a polymer powder extract

A process for preparing a polymer powder extract from a mixture of a polymer powder and a first particulate material reduces the level of particulate contamination of the polymer powder by exploiting the different behaviour of the particulate material and the polymer powder in a fluid.

METHODS FOR MODIFYING THE RHEOLOGY OF POLYMERS

The disclosure relates to a method for modifying the rheology of a polymer and a polymeric composition obtained by the method. The composition comprises at least one organic peroxide and water in emulsion form. The polymer may comprise a polyolefin. The method comprises extruding a molten polymer and the composition and removing volatile compounds from the molten polymer. 1. A method for modifying the rheology of a polymer , comprising:extruding a molten polymer and a composition comprising at least one organic peroxide and water in emulsion form; andremoving volatile compounds from the molten polymer,wherein the volatile compounds comprise volatile organic compounds and water.2. The method of claim 1 , wherein removing is performed during extruding.3. The method of claim 2 , wherein removing the volatile compounds is performed by establishing a vacuum in at least one extruder venting zone.4. The method of claim 3 , wherein the vacuum is set to from 0 mbar to 800 mbar.5. The method of claim 3 , wherein the at least one extruder venting zone is provided in at least one extruder decompression zone.6. The method of claim 1 , the method further comprising feeding the polymer and the composition so that the amount of the at least one peroxide feed ranges from 100 ppm to 6000 ppm with respect to the amount of the polymer feed.7. The method of claim 1 , wherein the composition comprises 20% to 80% by weight of the at least one organic peroxide claim 1 , up to 15% by weight of an emulsifier claim 1 , and water in quantity enough to complete the 100% of the composition total weight.8. The method of claim 1 , wherein the at least one organic peroxide contains less than 10% by weight of active oxygen with respect to the total weight of organic peroxide(s).9. The method of claim 1 , wherein the at least one organic peroxide is selected from the group comprising dialkyl peroxides.10. The method of claim 9 , wherein at least one organic peroxide is selected from the group ...

PROCESS AND DEVICE FOR MANUFACTURING AN AROMATIC ALKYLENE POLYMER

The present invention relates to a process and a device for the continuous manufacture of a polymer of an aromatic alkylene monomer e.g. styrene comprising a bulk polymerisation of the monomer and a devolatilization of the resulting polymer in at least two successive steps so as to separate the polymer from the unreacted monomer and the oligomers formed during the polymerisation. The process comprises conveying a first gas stream resulting from the first step of the devolatilization into a first zone Z1 for direct condensation and fractionation, removing a gas stream G1 comprising essentially the monomer from the top of Z1, and removing a liquid stream L1 rich in oligomers from the bottom of Z1, a portion of L1 being taken, cooled and then returned into Z1. It also comprises conveying a second gas stream resulting from the second step of the devolatilization into a second zone Z2 for direct condensation and fractionation, this zone being also fed with the other portion of L1, removing a ...

Method for the purification of propylene polymers

СПОСОБЫ РЕГУЛИРОВАНИЯ И СИСТЕМЫ, ПРЕДНАЗНАЧЕННЫЕ ДЛЯ ОЧИСТКИ ПОЛИМЕРНОГО ПРОДУКТА ПРОДУВКОЙ

СПОСОБ ТЕРМИЧЕСКОГО ОТДЕЛЕНИЯ ЛЕТУЧЕГО ВЕЩЕСТВА ОТ НЕЛЕТУЧЕГО ИЛИ МЕНЕЕ ЛЕТУЧЕГО СУБСТРАТА

... 1. Способ термического отделения летучего вещества от нелетучего или менее летучего субстрата, имеющего границу раздела фаз, обращенную к газовому пространству, в которое поступает летучее вещество после испарения и/или сублимации, отличающийся тем, что к границе раздела фаз между субстратом и газовым пространством подводят механическую энергию, чтобы увеличить массообмен летучего вещества.2. Способ термического отделения летучего вещества от нелетучего или менее летучего субстрата, имеющего границу раздела фаз, обращенную к газовому пространству, в которое поступает летучее вещество после испарения и/или сублимации, отличающийся тем, что в субстрат вводят летучую или частично летучую (испаряющуюся) присадку и пузырьки, образующиеся в субстрате из испаряющихся компонентов, подвергают разрушению.3. Способ по п. 2, отличающийся тем, что количество добавляемой присадки составляет по меньшей мере 0,1 кг на 1 кг вязкой массы в час.4. Способ по п. 2 или 3, отличающийся тем, что присадку вводят ...

Improvements in or relating to the purification of fluorine-containing polymers

Metallic impurities are removed from fluorine-containing polymers by treating with a carboxylic acid having from 2 to 14 carbon atoms in the molecule, and oxidizable impurities, such as wood, paper, oil, cloth and grease, are removed by treating with a mixture of a carboxylic acid having from 2 to 10 carbon atoms and an inorganic metallic oxidizing compound of a metal in its highest valence state which is reducible to a compound of the metal in a low valence state, with or without a secondary inorganic metallic oxidizing reagent having a sufficiently high oxidizing potential to maintain the inorganic oxidizing compound in its highest valence state. The polymer may be a homopolymer of tetrafluoroethylene, trifluorochloroethylene, perfluoropropene, or perfluorobutadiene, or a copolymer of one of the above with one or more of ethylene, vinyl chloride, vinyl fluoride, vinylidene fluoride, vinylidene chloride or trifluoroethylene. The carboxylic acid may be ethylene diamine tetracetic or tetrapropionic ...

Apparatus for devolatilizing polymeric compositions

Apparatus for removing volatile components, e.g. monomers, dimers and trimers, from a polymeric composition comprises a chamber 115 (Fig. 2) into which the polymer in liquid phase is admitted centrally through a pipe 103, a downwardly diverging cooled cover 107 above the chamber and enclosing the top thereof, and a trough 108 at the bottom of the cover to collect condensed volatile components. Optional features of the apparatus comprise (1) a heat-exchanger 102 through which the polymer passes on its way to the pipe 103, (2) heating jackets for the pipe 103 and the chamber 115, (3) a cooling jacket 110 around the cover 107, (4) means for adjusting the size of the outlet orifice from the pipe 103 so as to maintain in the pipe 103 a sufficient pressure to prevent the vapourization of volatile components in the pipe, and (5) means for varying the pressure in the chamber 115. The outlet orifice of the pipe 103 may be flush with the top of the cover ...

Improved method for extraction of polymerizates of olefins

Low molecular weight fractions and/or catalyst residues are removed from polymers of mono-1- olefins which have been made by bulk polymerization using Zeigler-Natta type catalysts by contacting the effluent, i.e. polymer, monomer, and catalyst residues, with a complexing agent for the catalyst residues under liquid phase conditions in a contacting zone in which the effluent is heated in a first section of the zone to increase the complexing reaction, and cooled in a second section to a temperature sufficient to increase the extraction of low molecular weight fractions therefrom, washing the effluent from the contacting zone in a wash zone, wherein low molecular weight polymer fractions are removed, and recovering the solid high polymer from the slurry in the wash column. The 1-olefin may be ethylene, propylene, 1-butene, 1-pentene, or 3-methyl-1-butene. The complexing agent is preferably diacetylacetone mixed with propylene oxide. The wash liquid may be propylene, propane, or mixtures thereof ...

Process

DEGASSING PROCEDURE FOR IN MASS MANUFACTURE OF POLYMERS AND COPOLYMERS ON BASIS VINYL CHLORIDE

PROCEDURE AND DEVICE FOR THE PRODUCTION OF A VINYLAROMATI POLYMER

SUPERCRITICAL LIQUID EXTRACTION WITH HYDRAULIC FLUORINE ALKANES

ENTGASUNGSVERFAHREN FUER IN MASSE HERGESTELLTE POLYMERE UND COPOLYMERE AUF BASIS VINYLCHLORID

CRYSTALLIZATION CONVEYOR

METHOD FOR IMPROVE THE HANDLING HEAT RESISTANCE OF THE ETHYLENE-VINYL ALCOHOL COPOLYMER

Method for stereospecifically recycling a pla polymer mixture

The present invention relates to a method for the stereospecific chemical recycling of a mixture of polymers based on polylactic acid PLA, in order to reform the monomer thereof or one of the derivatives thereof. The latter may enter the traditional lactate market or once again serve as a raw material for synthesising PLA.

PROCESS FOR PRODUCING (METH)ACRYLIC RESIN COMPOSITION

A method for producing a (meth)acrylic resin composition, comprising: continuously feeding reaction starting materials to a tank reactor, the reaction starting materials comprising a polymerizable monomer component, a chain transfer agent and a radical polymerization initiator, the polymerizable monomer component comprising 50 to 100% by mass of methyl methacrylate, 0 to 20% by mass of an acrylic acid alkyl ester and 0 to 30% by mass of an additional monomer; conducting bulk polymerization of the polymerizable monomer component at a polymerization conversion ratio of 40 to 70% by mass to obtain a liquid containing a (meth)acrylic resin; continuously feeding the resulting liquid to a vented extruder to separate volatile component from the (meth)acrylic resin; conducting distillation using an atmospheric distillation column to separate the volatile component into a high boiling fraction (C) and a low boiling fraction (A); and conducting distillation using a vacuum distillation column having a pressure of −50 kPaG to −101 kPaG at the top of the vacuum distillation column to separate the high boiling fraction (C) into a high boiling fraction (C) and a low boiling fraction (A); reusing the low boiling fraction (A) and the low boiling fraction (A) as part of the reaction starting materials. 1. A method of producing a (meth)acrylic resin composition , comprising:continuously feeding reaction starting materials to a tank reactor, the reaction starting materials comprising a polymerizable monomer component, a chain transfer agent and a radical polymerization initiator, the polymerizable monomer component comprising 50 to 100% by mass of methyl methacrylate, 0 to 20% by mass of an acrylic acid alkyl ester and 0 to 30% by mass of an additional monomer;conducting bulk polymerization of the polymerizable monomer component at a polymerization conversion ratio of 40 to 70% by mass to obtain a liquid comprising a (meth)acrylic resin;continuously feeding the resulting liquid to a ...

Copolymer and method for preparing the same

The present invention relates to a copolymer including 20 to 65 wt % of units derived from an alkyl styrene-based monomer; 10 to 40 wt % of units derived from a (meth)acrylate-based monomer; and 20 to 40 wt % of units derived from vinyl cyan-based monomer, based on the total weight of the copolymer, wherein the residual monomer content is 780 ppm or less, and a method for preparing the same.

METHODS FOR PRODUCING GRAPHENE FROM COAL

A method of preparing graphene from coal can include thermally processing raw coal and, after the coal has been at least partially cooled from thermal processing, forming reduced graphene oxide from the coal. 1. A method of producing reduced graphene oxide from coal , the method comprising:thermally processing coal at a temperature of at least about 300° F.;oxidizing the thermally processed coal to form coal oxide; andforming reduced graphene oxide from the coal oxide, the reduced graphene oxide comprising a predetermined concentration of less than about 15 atomic % of one or more impurity atoms.2. The method of claim 1 , wherein forming reduced graphene oxide from the coal oxide comprises:centrifuging the coal oxide;collecting precipitate from the coal oxide after centrifuging, the precipitate comprising graphene oxide; andreducing the graphene oxide to form reduced graphene oxide.3. The method of claim 1 , wherein oxidizing the coal to form a coal oxide comprises mixing the coal with at least one of sulfuric acid claim 1 , nitric acid claim 1 , or potassium permanganate claim 1 , or hydrogen peroxide to form the coal oxide.4. The method of claim 3 , wherein mixing the coal with at least one of sulfuric acid claim 3 , nitric acid claim 3 , potassium permanganate claim 3 , or hydrogen peroxide to form the coal oxide comprises:mixing the coal with at least one of sulfuric acid and nitric acid;stirring the coal mixed with at least one of the sulfuric acid and the nitric acid;mixing potassium permanganate to the coal mixed with at least one of the sulfuric acid and the nitric acid;stirring the coal mixed with the potassium permanganate and at least one of the sulfuric acid and the nitric acid;diluting, with water, the coal mixed with the potassium permanganate and at least one of the sulfuric acid and the nitric acid to form a solution;mixing the solution with hydrogen peroxide;performing a first centrifugation of the solution mixed with the hydrogen peroxide; andafter ...

PROCESS FOR REMOVING VOLATILE COMPONENTS FROM AN OLEFIN POLYMER AND ARTICLE OBTAINED

The invention relates to a process for removal of volatile components from an olefin polymer, the process carried out in an extruder comprising at least one vacuum degassing zone, said process comprising the steps of: (a) introducing a stream of an olefin polymer into the extruder; (b) extruding the olefin polymer in the extruder at a temperature which is higher than the melting temperature of the olefin polymer but lower than the decomposition temperature of the olefin polymer, thereby producing an olefin polymer melt having reduced amount of volatile components, wherein the process in the extruder has a residence time distribution broadness (σ2) in the range of 800 to 4000 as define by equation (1) wherein: σ2 is the residence time distribution broadness, T is the mean residence time, t is the interval of residence time a fluid element of the olefin polymer spends in the extruder, E(t) is the residence time distribution function, and wherein the process optionally comprises a step (c) where the melt of the olefin polymer is passed through a die zone to a pelletizer for pelletizing the obtained olefin polymer. 1. A process for removal of volatile components from an olefin polymer , the process carried out in an extruder comprising at least one vacuum degassing zone , said process comprising the steps of:(a) introducing a stream of an olefin polymer into the extruder;(b) extruding the olefin polymer in the extruder at a temperature which is higher than the melting temperature of the olefin polymer but lower than the decomposition temperature of the olefin polymer, thereby producing an olefin polymer melt having reduced amount of volatile components,{'sup': '2', 'claim-text': {'br': None, 'sup': 2', '∞', '2, 'sub': '0', 'i': t', 'E', 't', 'dt, 'σ=∫(−τ)()\u2003\u2003equation (1)'}, 'wherein the process in the extruder has a residence time distribution broadness (σ) in the range of 800 to 4000 as define by equation 1'}wherein:σ2 is the residence time distribution ...

Control Methods and Systems For Polymer Product Purge

Disclosed herein are methods and systems for purging a polymer product of volatiles. The methods and systems are particularly useful in the purging of a polyethylene polymer product produced in a fluidized bed reactor.

PACKAGE FOR PELLETS OF SAPONIFIED ETHYLENE-VINYL ESTER-BASED COPOLYMER OR RESIN COMPOSITION THEREOF

The purpose of the invention is to provide: a package for EVOH resin pellets which is capable of providing the EVOH resin pellets almost free from powder even in a case where the package contains the powder generated therein during transportation or the like after shipment; and EVOH resin pellets contaminated with very small amount of the powder in a case where a user uses the EVOH resin pellets as a molding material. A package, where pellets each having a substantially circular or oval cross-section are packed in a packaging container whose inner surface has a surface resistivity of 1.0×10Ω or more, is capable of providing pellets to which 0.8 wt % or less of powder adhered relative to the weight of the pellets. 1. A package comprising pellets made of saponified ethylene-vinyl ester-based copolymer or resin composition thereof , and a packaging container in which the pellets are packed , wherein the inside surface of the packaging container has a surface resistivity of 1.0×10Ω or more , and wherein each of the pellets has an approximately circular or oval cross-section.2. The package according to claim 1 , wherein the inside surface of the packaging container has a surface resistivity of 1.0×10Ω or less.3. The package according to claim 1 , wherein the packaging container is formed from a multilayer film.4. The package according to claim 3 , wherein the multilayer film comprises an aluminum layer.5. The package according to claim 4 , wherein a rate in thickness of the aluminum layer to the multilayer film is in the range of 3.0 to 10%.6. The package according to claim 1 , further comprising powder in an amount of 0.0001 to 2.0 weight % based on the weight of the pellets of saponified ethylene-vinyl ester-based copolymer or resin composition thereof.7. The package according to claim 6 , wherein the powder has a dimension passing through a 30 mesh sieve having an aperture of 500 μm.8. Pellets of saponified ethylene-vinyl ester-based copolymer or resin composition ...

METHODS FOR PRODUCING ADVANCED CARBON MATERIALS FROM COAL

A method of producing advanced carbon materials can include providing coal to a processing facility, beneficiating the coal to remove impurities from the coal, processing the beneficiated coal to produce a pitch, and treating the pitch to produce an advanced carbon material such as carbon fibers, carbon nanotubes, graphene, resins, polymers, biomaterials, or other carbon materials. 1. A method of producing an advanced carbon material , comprising:providing an amount of coal to a processing facility;beneficiating the amount of coal at the processing facility to remove impurities therefrom;processing the beneficiated amount of coal at the processing facility to produce an amount of pitch from at least some of the amount of coal; andtreating at least some of the amount of pitch at the processing facility to produce the advanced carbon material.2. The method of claim 1 , wherein providing coal to a processing facility comprises extracting coal from a coal mine.3. The method of claim 2 , wherein extracting coal from the coal mine comprises a high wall coal mining process.4. The method of claim 1 , wherein providing coal to a processing facility further comprises transporting the coal extracted from the coal mine to the processing facility.5. The method of claim 1 , wherein the amount of coal is an amount of raw coal.6. The method of claim 1 , wherein beneficiating the amount of coal comprises heating the amount of coal to a first temperature for a first duration; andheating the amount of coal to a second, higher temperature for a second duration.7. The method of claim 1 , wherein beneficiating the amount of coal removes at least 85% of mercury from the amount of coal.8. The method of claim 1 , wherein beneficiating the amount of coal produces a beneficiated amount of coal having less than about 5 wt. % of water.9. The method of claim 1 , wherein beneficiating the amount of coal removes at least 50% of volatile matter from the amount of coal.10. The method of claim 1 , ...

POLYMER AND PREPARATION METHOD AND APPLICATION THEREOF

Provided are a polymer having ultraviolet absorption functionality and preparation method thereof; specifically, three monomers having different ultraviolet absorption bands are used for copolymerization, achieving a significant expansion of the ultraviolet absorption range and achieving the effect of full-band ultraviolet shielding. The obtained polymer film has strong visible light transmittance, fluorescence, easy processing, excellent stability, and remarkable ultraviolet shielding performance, and can be broadly applied in such areas as aviation, construction, agriculture, and optical devices. 1. A polymer , wherein the polymer is made by polymerization of methyl methacrylate , ethylene glycol pyridone acid methacrylate , and methyl 4-methacrylamido benzoate in a mass ratio of 1:(0.01-10):(0.01-10).2. A polymer film prepared from the polymer of .3. A method for preparing the polymer of claim 1 , comprising the following steps:dissolving methyl methacrylate, ethylene glycol pyridone acid methacrylate, methyl 4-methacrylamido benzoate and a trace amount of initiator according to the mass ratio 1:(0.01-10):(0.01-10) in a solvent to carry out polymerization reaction; andseparating and purifying the copolymer.4. The method for preparing the polymer of claim 3 , wherein the temperature of the polymerization reaction is in a range from 50° C. to 100° C.5. The method for preparing the polymer of claim 3 , wherein the reaction time of the polymerization reaction is in a range from 2 h to 36 h.6. The method for preparing the polymer of claim 3 , wherein the initiator comprises one or more of cyclohexanone peroxide claim 3 , benzoyl peroxide claim 3 , lauroyl peroxide claim 3 , cumyl hydroperoxide claim 3 , dicyclohexyl peroxydicarbonate claim 3 , potassium persulfate claim 3 , ammonium persulphate claim 3 , azodiisobutyronitrile; and/orthe solvent comprises one or more of acetone, ethanol, dichloromethane, ethyl acetate, tetrahydrofuran, toluene; and/ora protective gas ...

SYSTEMS AND METHODS FOR PROCESSING FLUOROPOLYMER MATERIALS AND RELATED WORKPIECES

A method for removing perfluorinated compounds from a fluoropolymer material is provided. The method includes the steps of: (a) providing the fluoropolymer material in a chamber; (b) providing an anaerobic environment in the chamber; and (c) providing a fluorination gas in the chamber, thereby exposing the fluoropolymer material to the fluorination gas. The method results in the removal the perfluorinated compounds from the fluoropolymer material. 2. The method of claim 1 , wherein the fluoropolymer material comprises the perfluorinated compounds used in the manufacture of the fluoropolymer material.3. The method of claim 1 , wherein the amount of the perfluorinated compounds in the processed fluoropolymer material is less than 1.1% the amount of the perfluorinated compounds in the fluoropolymer material.4. The method of claim 1 , wherein the perfluorinated compounds comprise perfluorooctanoic acid (PFOA) and an amount of the PFOA in the processed fluoropolymer material is less than 1.1% the amount of PFOA in the fluoropolymer material.5. The method of claim 1 , wherein the fluoropolymer material is a fluoropolymer micropowder claim 1 , the perfluorinated compounds comprise PFOA claim 1 , and the amount of PFOA in the processed fluoropolymer material is less than 100 ppt.6. The method of claim 1 , wherein the fluoropolymer material is a PTFE micropowder claim 1 , the perfluorinated compounds comprise PFOA claim 1 , and the amount of PFOA in the processed fluoropolymer material is less than 100 ppt.7. The method of claim 1 , further comprising the step of heating the chamber to a temperature in a range of 25° C. to 325° C. claim 1 , and wherein the fluoropolymer material is exposed to the fluorination gas at a chamber pressure in a range of 5 PSIA to 55 PSIA.8. The method of claim 1 , wherein the fluoropolymer material is exposed to the fluorination gas for a time period in a range of 1 hour to 1000 hours claim 1 , and wherein the fluorination gas comprises 1 vol % ...

METHOD FOR PRODUCING (METH)ACRYLIC RESIN COMPOSITION

A (meth)acrylic resin composition is obtained by a method comprising: continuously feeding a raw material solution essentially comprising methyl methacrylate, a chain transfer agent and a radical polymerization initiator, and optionally comprising an acrylic acid alkyl ester in a mass ratio of the acrylic acid alkyl ester to the methyl methacrylate of 0/100 to 20/80 into a tank reactor to allow bulk polymerization to proceed in the tank reactor at a polymerization conversion ratio of 40 to 70% by mass to obtain a reaction product while continuously discharging the reaction product from the tank reactor; heating the discharged reaction product with a heat exchanger; removing volatile matter from the heated reaction product; filtrating a liquid additive through a filter; and adding the filtrated liquid additive to the reaction product from which the volatile matter has been removed. 1. A method for producing a (meth)acrylic resin composition , the method comprising:continuously feeding a raw material solution into a tank reactor, wherein the raw material solution comprises methyl methacrylate, a chain transfer agent and a radical polymerization initiator, and optionally comprises an acrylic acid alkyl ester in a mass ratio of the acrylic acid alkyl ester to the methyl methacrylate of 0/100 to 20/80;bulk-polymerizing in the tank reactor at a polymerization conversion ratio of 40 to 70% by mass to obtain a reaction product;continuously discharging the reaction product from the tank reactor;heating the discharged reaction product with a heat exchanger;removing volatile matter from the heated reaction product;filtrating a liquid additive through a filter; andadding the filtrated liquid additive to the reaction product from which the volatile matter has been removed.2. The method according to claim 1 , further comprising:purging an additive preparation tank with an inert gas; andsubsequently melting at least one additive in the additive preparation tank to obtain the ...

PURIFIED POLYMER RESINS AND METHODS FOR MAKING

A method to purify a polymer is disclosed. The method is part of a manufacturing process wherein a virgin polymer is produced from a polymerization process employing at least a monomer or a comonomer as a feedstock. The monomer or the comonomer is selected from the group consisting of organic polar monomers, inorganic monomers, vinyl aromatic monomers, conjugated dienes, and mixtures thereof. In the method, the polymer in solid, liquid or molten state is brought into contact with a fluid solvent or an extraction fluid in a supercritical state or near supercritical state. The contact is at controlled temperature and pressure, allowing the fluid solvent to diffuse into the polymer and extract the impurities intended to remove. The method can be used to remove at least 10%, or at least 20%, or at least 50% of the target impurity from the polymer. 1. A method to purify a polymer , comprising: wherein the polymer is in molten, liquid or solid form, and the polymer contains at least an impurity to be removed;', 'wherein the impurity is selected from unreacted monomer or comonomer, catalyst residues, oligomers, by-products, impurities in the monomer or comonomer, unreacted monomer or comonomer, solvents, residual processing aids, additives, modifiers, diluents, chelating agents, solvent modifiers, chain terminating agents, chain transfer agents, coupling agents, dimers, trimers, metals, catalyst decomposition products, polymer fractions, catalytic solvents, salts, acids, bases, odor-causing compounds, and mixtures thereof;, 'providing a polymer from a polymerization process employing at least a monomer or a comonomer as a feedstock, wherein the monomer or the comonomer is selected from the group consisting of organic polar monomers, inorganic monomers, vinyl aromatic monomers, conjugated dienes, and mixtures thereof, and'} 'wherein the pressure and temperature being controlled for the polymer to be essentially insoluble in the fluid solvent or for the polymer to dissolve ...

Method of purifying polyolefin

Provided is a method of purifying polyolefin, the method including the step of contacting linear low-density polyethylene synthesized by a gas phase polymerization reaction with a purge gas containing an ethylene gas and an inert gas in a purge bin. According to this purification method, residual alkene monomers with high carbon numbers may be removed in a simpler and more efficient manner.

METHOD FOR PRODUCING HETEROPHASIC PROPYLENE POLYMERIZATION MATERIAL PARTICLES

Provided is a particle drying method capable of sufficiently removing the volatile component and down-regulating the increase of the viscosity of the particles after the removal of the volatile component. There is provided a method for producing heterophasic propylene polymerization material particles, the method including: (1) performing monomer polymerization in the presence of a catalyst including a solid catalyst component so as to obtain a component I; (2) performing monomer polymerization in the presence of the component I so as to obtain the component II, so that particles including a volatile component are produced; and (3) causing the particles to contact with an inert gas-containing stream so as to remove the volatile component from the particles. 1. A method for producing heterophasic propylene polymerization material particles , the method comprising:(1) performing monomer polymerization in the presence of a catalyst including a solid catalyst component so as to obtain a component (I) recited below;(2) performing monomer polymerization in the presence of the component (I) so as to obtain a component (II), so that particles including a volatile component, the component (I), and the component (II) are produced; and(3) causing the particles to contact with an inert gas-containing stream so as to remove the volatile component from the particles,the particles including the component (I) by 20 to 70 mass %, and the component (II) by 30 to 80 mass %, and {'br': None, 'i': T', '·t', 'C/', 'd', 'P, 'sup': 1.12', '0.17', '0.61', '1/3', '0.13, '19.5≤·(100)/(·(0.85·))≤51.4\u2003\u2003(1)'}, 'the method satisfying Inequation (1)where T [° C.] is a temperature that the particles have when the particles contact with the inert gas-containing stream, t [h] is a contact time period in which the particles contact with the inert gas-containing stream, d [μm] is a median diameter that the solid catalyst component has at the time of start of step (1), P [g/g] is a mass of the ...

Method for preparing super absorbent polymer, and super absorbent polymer

The present invention relates to a method for preparing a super absorbent polymer exhibiting improved liquid permeability, gel strength, absorption rate and the like while maintaining excellent absorption performance. The method for preparing the super absorbent polymer comprises the steps of: carrying out a crosslinking polymerization of a water-soluble ethylenically unsaturated monomer having at least partially neutralized acidic groups in the presence of an internal crosslinking agent to form a hydrogel polymer including a cross-linked polymer; drying, pulverizing, and classifying the hydrogel polymer to form a base polymer powder; and surface-crosslinking the base polymer powder by using a surface crosslinking liquid containing a surface crosslinking agent of an alkylene carbonate having 2 to 5 carbon atoms, in the presence of hydrophobic silica particles having a water-contact angle of more than 10° and 150° or less and hydrophilic silica particles having a water-contact angle of 10° or less.

Modified resins and uses thereof

Modified thermoplastic hydrocarbon thermoplastic resins are provided, as well as methods of their manufacture and uses thereof in rubber compositions. The modified thermoplastic resins are modified by decreasing the relative quantity of the dimer, trimer, tetramer, and pentamer oligomers as compared to the corresponding unmodified thermoplastic resin polymers, resulting in a product that exhibits a greater shift in the glass transition temperature of the elastomer(s) used in tire formulations. This translates to better viscoelastic predictors of tire tread performance, such as wet grip and rolling resistance. The modified thermoplastic resins impart remarkable properties on various rubber compositions, such as tires, belts, hoses, brakes, and the like. Automobile tires incorporating the modified thermoplastic resins are shown to possess excellent results in balancing the properties of rolling resistance, tire wear, snow performance, and wet braking performance.

METHODS FOR MODIFYING THE RHEOLOGY OF POLYMERS

The disclosure relates to a method for modifying the rheology of a polymer and a polymeric composition obtained by the method. The composition comprises at least one organic peroxide and water in emulsion form. The polymer may comprise a polyolefin. The method comprises extruding a molten polymer and the composition and removing volatile compounds from the molten polymer. 116.-. (canceled)17. A method for modifying the rheology of a polymer , comprising:extruding a molten polymer and a composition comprising at least one organic peroxide and water in emulsion form, wherein the composition does not include mineral oil; andremoving volatile compounds from the molten polymer under extrusion conditions and under a predetermined vacuum,wherein the volatile compounds comprise water and volatile organic compounds resulting from the degradation of at least one of the organic peroxide or the polymer, andwherein removing volatile compounds is performed by establishing the predetermined vacuum in at least one extruder venting zone.18. The method of claim 17 , wherein the predetermined vacuum is set to from 0 mbar to 800 mbar.19. The method of claim 17 , wherein the at least one extruder venting zone is provided in at least one extruder decompression zone.20. The method of claim 17 , further comprising feeding the polymer and the composition so that the amount of the at least one peroxide feed ranges from 100 ppm to 6000 ppm with respect to the amount of the polymer feed.21. The method of claim 17 , wherein the at least one organic peroxide contains less than 10% by weight of active oxygen with respect to the total weight of organic peroxide(s).22. The method of claim 17 , wherein the at least one organic peroxide is selected from the group comprising dialkyl peroxides.23. The method of claim 17 , wherein the at least one organic peroxide is selected from the group comprising 2 claim 17 ,5-dimethyl-2 claim 17 ,5-di(tert-butylperoxy)hexane-3 claim 17 , ditert-butyl peroxide ...

A PROCESS FOR REMOVING CHLORIDE FROM A POLYMER MELT

The present disclosure provides a process for removing chloride from a polymer melt using at least one adsorbent. The adsorbent is selected from a metal oxide mixture, a mixture of alumina and hydrotalcite, crystalline fajausite zeolite and alumina doped with at least one metal. The process of the present disclosure is carried out at a temperature in the range of 260° C. to 280° C., and at a pressure in the range of 120 bar to 160 bar for time period in the range of 12 hours to 200 hours. The amount of chloride adsorbed on the adsorbent is in the range of 0.1% to 6.0% w/w. 1. A process for removing chloride from a polymer melt using at least one adsorbent , the process comprising the following steps:dissolving the polymer melt containing chlorides with at least one fluid medium to form a polymer melt solution;extracting the chlorides from the polymer melt solution by adsorbing chlorides on at least one adsorbent that is contacted with the polymer melt solution at a predetermined temperature to obtain a resultant mixture containing treated polymer melt solution and adsorbent with adsorbed chloride; andseparating the adsorbent with adsorbed chloride from the resultant mixture to obtain a polymer melt solution with reduced chloride content.2. The process as claimed in claim 1 , further involves the step of separating the fluid medium from the polymer melt solution with reduced chloride content claim 1 , wherein the separation is carried out by evaporation of the fluid medium under reduced pressure.3. The process as claimed in claim 1 , wherein the polymer melt is at least one selected from the group consisting of polyethylene melt claim 1 , and polypropylene melt.4. The process as claimed in claim 1 , wherein the adsorbent comprises a metal oxide mixture and a binder claim 1 , the metal oxide mixture comprises metal oxides selected from the group consisting of zinc oxide claim 1 , calcium oxide claim 1 , magnesium oxide claim 1 , and aluminum oxide.5. The process as ...

A method of diminishing the source of odor from polyolefin obtained by use of metallocene compound

Method for product recovery of polyolefins

A method for product recovery method of polyolefins, particularly high-molecular-weight amorphous poly alpha-olefins, wherein the use of water during the method is significantly decreased and wherein the intermediate stage of storing and drying the chunk form of the polyolefin is eliminated. Polyolefins produced in a reactor are heated in a kneader to remove any unreacted monomer(s). The polyolefin material in a liquid form is then transferred directly to an extruder to further remove any unreacted monomer(s) and catalyst(s). Finally, the polyolefin material is pelletized using a pelletizer.

Apparatus for product recovery of polyolefings

A method and apparatus for product recovery of polyolefins, particularly high molecular weight amorphous poly alphaolefins, wherein the use of water during the method is significantly decreased and wherein the intermediate stage of storing and drying the chunk form of the polyolefin is eliminated. Polyolefins produced in a reactor are heated and mixed by sigma blades in a kneader-extruder to remove any unreacted monomer(s). The polyolefin material in a liquid form is then transferred directly to an extruder to further remove any unreacted monomer(s) and catalyst(s). The invention further includes a method of measuring the inventory in a vessel using a gas of known quantity and known thermodynamic properties.

Elastomeric polyolefins production and recovery

Disclosed herein are novel polymers and copolymers of alphaolefins produced using various Ziegler/Natta and Metallocene catalysts. Commercial production of these polymers is now possible for the first time owing to the polymer harvesting technology also disclosed herein.

Apparatus for solvent extraction of catalyst from polymer solids

Control methods and systems intended for purification of polymer product by blowing

FIELD: technological processes. SUBSTANCE: invention relates to methods and systems intended for purification of polymer product by blowing or degassing. Described is a method for purifying a polymer product from volatile substances by blowing in at least one purging vessel to obtain a purified polymer product. Dependence of cleaning purification efficiency is determined with its further adjustment for improvement of purification efficiency. Also described is a polymer product purification system. EFFECT: technical result is simulation of operation of system purposed for purging, and model, which more accurately predicted efficiency of purging by blow and effect of changes on corresponding variables. 15 cl, 2 dwg, 1 tbl, 1 ex РОССИЙСКАЯ ФЕДЕРАЦИЯ (19) RU (11) (13) 2 738 657 C2 (51) МПК C08F 6/28 (2006.01) C08F 6/10 (2006.01) B01J 8/00 (2006.01) ФЕДЕРАЛЬНАЯ СЛУЖБА ПО ИНТЕЛЛЕКТУАЛЬНОЙ СОБСТВЕННОСТИ (12) ОПИСАНИЕ ИЗОБРЕТЕНИЯ К ПАТЕНТУ (52) СПК C08F 6/28 (2019.08); C08F 6/005 (2019.08); B01J 8/0015 (2019.08); B01J 8/003 (2019.08); B01J 8/24 (2019.08); C08F 2/01 (2019.08); C08F 210/02 (2019.08) (21)(22) Заявка: 2018117677, 07.09.2016 07.09.2016 (73) Патентообладатель(и): ЭКСОНМОБИЛ КЕМИКЭЛ ПЕЙТЕНТС ИНК. (US) Дата регистрации: 15.12.2020 05.11.2015 US 62/251,446; 08.01.2016 EP 16150559.9 (43) Дата публикации заявки: 05.12.2019 Бюл. № 34 (45) Опубликовано: 15.12.2020 Бюл. № 35 C 2 C 2 (85) Дата начала рассмотрения заявки PCT на национальной фазе: 05.06.2018 (86) Заявка PCT: US 2016/050486 (07.09.2016) 2 7 3 8 6 5 7 (87) Публикация заявки PCT: R U 2 7 3 8 6 5 7 (56) Список документов, цитированных в отчете о поиске: US 2011/0201765 А1, 18.08.2011. EP 2172494 А1, 07.04.2010. US 4372758 А, 08.02.1983. RU 2013/132830 А, 27.01.2015. WO 2012/082674 A1, 21.06.2012. Приоритет(ы): (30) Конвенционный приоритет: R U (24) Дата начала отсчета срока действия патента: (72) Автор(ы): СЭНДЕЛЛ Дэвид Дж. (US) WO 2017/078843 (11.05.2017) Адрес для переписки: 105082, Москва, пер. Спартаковский ...

一种医用聚乙烯的制备合成方法

本发明公开了一种医用聚乙烯的制备合成方法，属于乙烯加工技术领域。包括如下步骤，步骤一，将精制乙烯共聚单体投放与一流化床反应器进行聚合反应，并加入催化剂，对乙烯进行气相法冷凝聚合；步骤二，通过气流循环系统对物物料进行循环转换，并通过一回流混合室对气体混合以及散落颗粒回流；通过三，对聚烯烃树脂进行脱挥工艺处理；步骤四，进行树脂造粒。本发明通过对乙烯的聚合反应器进行改进，有效的使得反应器底部和内壁的液滴重新雾化和固体颗粒在读悬浮，并且实现导流器中冷凝态和非冷凝态的自由切换。

Process for removing volatile, odor-causing constituents from finely divided olefin polymers

抗冲聚丙烯的聚合方法

本发明涉及抗冲聚丙烯领域，公开了抗冲聚丙烯的制备方法，包括：(1)将液相丙烯携带聚合催化剂进行丙烯预聚合为含有丙烯预聚物的原料浆液；预聚合温度为40～45℃，预聚合压力为3.2～3.9MPaG，主催化剂为液相丙烯的0.02～0.05重量％；(2)将原料浆液、回收液相丙烯和氢气混为液相聚合原料，然后依次进行丙烯液相均聚和丙烯气相均聚，得到含聚丙烯的产物；(3)将所述含聚丙烯的产物进行分离，将分离出的聚丙烯与乙烯、第二丙烯进行共聚反应，得到抗冲聚丙烯。该方法可以降低抗冲聚丙烯聚合的单位产品能耗和丙烯损耗。

Method for producing heterophasic propylene polymer particles

Anti-agglomerants for elastomeric ethylene/.alpha.-olefin copolymers

The invention relates to a method to reduce or prevent agglomeration of elastomeric ethylene/a-olefin copolymer particles in aqueous media by LCST compounds.

A vacuum devolatilizer

Provided is a vacuum devolatilizer for use in a polymer manufacturing or processing plant. The devolatilizer comprises a vacuum chamber having an inlet for a polymer melt, an outlet for a polymer melt, a vacuum port through which volatiles may be removed and a stirrer shaft port for the entry of a stirrer shaft. The stirrer shaft passes through the at least one stirrer shaft port and extends into the vacuum chamber and carries an agitation means. The stirrer shaft seal is associated with each stirrer shaft port for sealing against the stirrer shaft and each stirrer shaft seal has an external portion outside the vacuum chamber. The devolatilizer is provided with a motor located outside of the vacuum chamber for rotating shaft and comprises means for blanketing the external portion of the stirrer shaft seal with a low oxygen content gas or vapor, e.g., nitrogen, helium, steam, or carbon dioxide.

Procede pour purifier les gaz de recirculation de particules condensees de polymere

Procédé pour éliminer les bas polymères des gaz de recirculation des installations effectuant la polymérisation ou la copolymérisation de l'éthylène sous une pression de 300 à 2500 bars et à une température de 130 à 350.degree.C, installations dans lesquelles le mélange de monomère et de polymère sortant du réacteur est détendu dans un séparateur fonctionnant sous pression de 50 à 500 bars. Le procédé de l'invention est caractérisé en ce que l'on fait passer ces gaz, à une température supérieure d'au moins 20.degree.C à la température de fusion des bas polymères, dans au moins un cyclone standard avec une vitesse d'entrée comprise entre 1 et 10 m/s, on refroidit ces gaz jusqu'à une température inférieure à la température de fusion des bas polymères, et on fait passer ces gaz dans au moins un cyclone chauffé avec une vitesse d'entrée comprise entre 2 et 20 m/s.

Method of reducing odor of composite resin particles, and composite resin particles

A method of reducing an odor of composite resin particles comprising the step of: fluidizing the composite resin particles, which contain a polyolefin-based resin and a polystyrene-based resin and which are used for producing an expanded molded article, in a container with a gas that is blown thereinto from its bottom and that has a temperature of (T-40) °C to (T-10) °C (T is a softening temperature of the composite resin particles), to reduce the odor generated from a raw material of the composite resin particles and generated according to a method of the composite resin particles, wherein the composite resin particles whose odor is reduced are impregnated with a blowing agent; and the resultant is pre-expanded and then subject to an in-mold forming to make the expanded molded article have an odor strength of 3 or less in average value in odor test in which odor of an isovaleric acid diluted 100000 times is defined as 3, which means a reference odor, within 0 to 5 levels of the odor strength.

Control methods and systems for polymer product purge

Disclosed herein are methods and systems for purging a polymer product of volatiles. The methods and systems are particularly useful in the purging of a polyethylene polymer product produced in a fluidized bed reactor.

복합 수지 입자 중의 악취의 저감 방법 및 복합 수지 입자

폴리올레핀계 수지와 폴리스티렌계 수지를 함유하는 발포 성형체 제조용의 복합 수지 입자를, 용기 내에서 상기 용기 하부로부터 불어 넣어진 (T-40)℃~(T-10)℃의 기체(T는 상기 복합 수지 입자의 연화 온도)에 의해 유동시킴으로써 상기 복합 수지 입자의 원료 및 제법으로부터 유래하는 악취를 저감시키는 방법이며, 악취가 저감된 상기 복합 수지 입자에 발포제를 함침시킨 후 예비 발포시키고, 계속해서 형내 성형시켜 얻어진 발포 성형체의 악취 강도의 평균값이 100000배로 희석된 이소발레르산의 악취를 악취 강도 0~5단계 중 3을 기준 냄새로 하는 악취 시험에서 3 이하가 되는 복합 수지 입자 중의 악취의 저감 방법.

Method of reducing odor of composite resin particles, and composite resin particles

Process for transferring solids

METHOD FOR PRODUCING LINEAR LOW-DENSITY POLYETHYLENE

Removing volatile constituents from particulate olefin polymers produced by gas-phase polymerization

1,272,778. Purifying polyolefins. BADISCHE ANILIN. & SODA. FABRIK A.G. 25 Sept., 1969 [26 Sept., 1968], No. 47150/69. Heading C3P. Volatile constituents are removed from particulate polyolefins prepared by gas phase polymerization by treating a layer of particles of the polymer of particle size 10 to 5000 microns with a stream of inert gas at a temperature of 80‹ C. to at least 5‹ C. below the crystallite melting point of the polymer while in vigorous motion. Specified polymers are of ethylene, propylene and/or butene-1. Specified gases are nitrogen, carbon dioxide and steam. The process is said also to improve the free-flowing properties and increase the bulk density of the polymer. Apparatus for carrying out the process is described and illustrated, and examples describe the treatment of (1) polypropylene, (2) polyethylene and (3) ethylene/butene-1 copolymer with streams of nitrogen.

聚丙烯或丙烯乙烯共聚物的制备方法

一种聚丙烯或丙烯乙烯共聚物的制备方法，包括：（1）将液相丙烯携带聚合催化剂进行丙烯预聚合为含有丙烯预聚物的原料浆液；预聚合温度为40～45℃，预聚合压力为3.2～3.9MPaG，烯烃聚合催化剂为液相丙烯的0.04～0.06重量％；（2）将原料浆液、回收液相丙烯和回收循环氢气混为液相聚合原料；（3a）将液相聚合原料进行丙烯液相均聚、丙烯气相均聚为含丙烯均聚物的产物；或者（3b）将液相聚合原料与乙烯进行液相无规共聚、气相无规共聚为含丙烯乙烯无规共聚物的产物，乙烯进料量为液相丙烯的5重量％以下；将产物进行气固分离，分离出聚合物和回收丙烯、氢气。该方法可以降低丙烯聚合中单位产品能耗和丙烯损耗。

Method of purifying polyolefin

본 발명은 퍼지 장치 내에서, 기상 중합 반응을 통하여 합성된 선형저밀도폴리에틸렌을 에틸렌 가스 및 불활성 기체를 포함하는 퍼지 가스와 접촉 시키는 단계를 포함하는, 폴리올레핀의 정제 방법에 관한 것이다. 이러한 정제 방법에 따르면, 보다 간단하고 효율적으로 탄소수가 높은 알켄류의 잔류 모노머도 제거할 수 있다. The present invention relates to a method for purifying a polyolefin, comprising the step of contacting a linear low density polyethylene synthesized through a gas phase polymerization reaction with a purge gas comprising an ethylene gas and an inert gas in a purge apparatus. According to such a purification method, it is possible to more simply and efficiently remove residual monomers of an alkene having a high carbon number.

Linear low density polyethylene process

PROCESS FOR ELIMINATING VOLATILE POLLUTANTS FROM FLUENT POLYMERS

Se trata de un proceso para eliminar contaminantes (incluyendo solvente) en un polímero fluente, el proceso, en un aspecto incluye disolver un agentedepurador soluble adicional en un polímero fluente, los contaminantes del agente depuradors oluble adicional del polímero fluente creando una mezcla decontaminantes y agente depurador soluble adicional, que fluye fuera del polímero fluente, y separando la mezcla del polímero. En un aspecto, elagente depurador soluble adicional esre cuperado y re-utilizado. It is a process to remove contaminants (including solvent) from a flowing polymer, the process, in one aspect includes dissolving an additional soluble scrubbing agent in a flowing polymer, the contaminants from the additional soluble scrubbing agent from the flowing polymer creating a mixture of contaminants and cleaning agent. additional soluble scrubber, flowing out of the flowing polymer, and separating the mixture from the polymer. In one aspect, the additional soluble scrubbing agent is recovered and reused.

Process for maleating polymerization residues and products

A process for converting distillation residues obtained from polymerization processes to useful maleated products is provided.

Polymerization process of impact polypropylene

A method for preparing an impact polypropylene, comprising: (1) performing propylene prepolymerization of a liquid phase propylene with a polymerization catalyst, to be a feedstock slurry containing a propylene prepolymer, wherein the prepolymerization temperature is 40ºC-45ºC, the prepolymerization pressure is 3.2-3.9 MPaG, and the main catalyst is 0.02 weight %-0.05 weight % of the liquid phase propylene; (2) mixing the feedstock slurry, a recovered liquid phase propylene and hydrogen gas into a liquid phase polymeric raw material; and then successively carrying out a liquid phase homopolymerization of propylene and a gas phase homopolymerization of propylene, to obtain a product containing polypropylene; (3) separating the product containing polypropylene, and subjecting the separated polypropylene to a copolymerization reaction with ethylene and a second propylene to obtain an impact polypropylene. The present method reduces energy consumption per unit product, and propylene loss.

一种特级电工级聚丙烯生产方法及装置

本发明公开了一种特级电工级聚丙烯生产方法，包括原料丙烯精制等步骤，其中，原料丙烯精制方法如下：原料丙烯首先在游离水分离器中分离掉游离态的水，然后进入装有3A分子筛的丙烯脱水塔中；自丙烯脱水塔脱水后的丙烯依次进入装填COS水解剂和装填氧化锌脱硫剂的丙烯脱硫塔；自丙烯脱硫塔脱除COS及H 2 S后的丙烯进入CO汽提塔；CO汽提塔塔底丙烯在液位控制下送往精脱硫塔；精脱硫塔脱除硫化物、CO 2 、氯化物的丙烯送入丙烯干燥塔脱水；丙烯干燥塔脱水后的丙烯进入丙烯脱砷塔；丙烯脱砷塔塔底的丙烯进入丙烯进料罐。

polymer product purge control methods and systems

a presente invenção refere-se a métodos e sistemas para purgar um produto de polímero de voláteis. os métodos e sistemas são particularmente úteis na purga de um produto de polímero de polietileno produzido em um reator de leito fluidizado. The present invention relates to methods and systems for purging a volatile polymer product. The methods and systems are particularly useful in purging a polyethylene polymer product produced in a fluidized bed reactor.

Polymer devolatilization

A process has been invented for removing contaminants (including solvent) from a flowing polymer, the process, in one aspect, including dissolving a sparingly soluble stripping agent into a flowing polymer, the sparingly soluble stripping agent stripping contaminants from the flowing polymer creating a mixture of contaminants and sparingly soluble stripping agent, which flows out from the flowing polymer, and separating the mixture from the polymer. In one aspect, recyclable sparingly soluble stripping agent is recovered and re-used.

Novel anti-agglomerants for the rubber industry

본 발명은 LCST 화합물에 의해 수성 매질 중의 고무 입자의 응결을 감소시키거나 방지하는 방법 및 이에 의해 얻은 엘라스토머에 관한 것이다. 본 발명은 추가로 이를 포함하거나 이로부터 유래된 엘라스토머 생성물에 관한 것이다. The present invention relates to a method for reducing or preventing the setting of rubber particles in an aqueous medium by means of a LCST compound and to the elastomer obtained thereby. The present invention further relates to elastomeric products comprising or derived therefrom.

Novel anti-agglomerants for elastomeric ethylene/α-olefin copolymers

The invention relates to a method to reduce or prevent agglomeration of elastomeric ethylene/α-olefin copolymer particles in aqueous media by LCST compounds.

聚合物回收与洗涤方法

本发明涉及聚合物材料的回收和洗涤方法，特别是来自高通量反应容器的聚合物样品的回收和洗涤的自动方法，所述方法包含：(i)使用包含C5到C8链烷烃的漂洗液将聚合物样品从高通量反应容器漂洗到过滤容器中，在所述过滤容器中提供包含聚合物样品、漂洗液和氧合物的混合物，(ii)通过过滤，在所述过滤容器中将漂洗液和氧合物从聚合物样品中除去，和(iii)随后在所述过滤容器中洗涤所述的聚合物样品以除去任何残留的包含C5到C8链烷烃的漂洗液。

Anti-agglomerants for the rubber industry

The invention relates to a method to reduce or prevent agglomeration of rubber particles in aqueous media by LCST compounds and elastomers obtained thereby. The invention further relates to elastomer products comprising the same or derived therefrom.

Anti-agglomerants for elastomeric ethylene/A-olefin copolymers

The invention relates to a method to reduce or prevent agglomeration of elastomeric ethylene/α-olefin copolymer particles in aqueous media by LCST compounds.

Anti-agglomerants for the rubber industry

The invention relates to a method to reduce or prevent agglomeration of rubber particles in aqueous media by LCST compounds and elastomers obtained thereby. The invention further relates to elastomer products comprising the same or derived therefrom.

Pelletized low molecular weight brominated aromatic polymer compositions

Novel polymer compositions of specified formula are converted into pellets of this invention by process technology provided by this invention. By forming a melt blend of a polymer of such polymer compositions together with a modest amount of at least one thermoplastic polymer of at least one monoolefinic monomer having 2-12 carbon atoms per molecule, and converting the melt blend into pellets as described herein, pellets can be formed produce during production, handling, and use, almost no "fines" or air-entrainable dusts. The pellets have an array of additional superior properties and characteristics.

Polymer devolatilization

A process has been invented for removing contaminants (including solvent) from a flowing polymer, the process, in one aspect, including dissolving a sparingly soluble stripping agent into a flowing polymer, the sparingly soluble stripping agent stripping contaminants from the flowing polymer creating a mixture of contaminants and sparingly soluble stripping agent, which flows out from the flowing polymer, and separating the mixture from the polymer. In one aspect, recyclable sparingly soluble stripping agent is recovered and re-used.

Method for purifying polyolefin

The present invention relates to a method for purifying polyolefin, the method comprising a step of bringing linear low-density polyethylene, which has been synthesized through gaseous phase polymerization, into contact with a purge gas, which includes an ethylene gas and an inert gas, in a purge device. According to the purification method, a remaining alkene monomer having a large number of carbons can be more simply and efficiently removed.

Method of purifying polyolefin

Provided is a method of purifying polyolefin, the method including the step of contacting linear low-density polyethylene synthesized by a gas phase polymerization reaction with a purge gas containing an ethylene gas and an inert gas in a purge bin. According to this purification method, residual alkene monomers with high carbon numbers may be removed in a simpler and more efficient manner.

纯化聚烯烃的方法

本发明涉及用于纯化聚烯烃的方法，所述方法包括使已经通过气相聚合合成的线性低密度聚乙烯与包含乙烯气体和惰性气体的净化气体在净化设备中接触的步骤。根据该纯化方法，余留的具有许多碳的烯烃单体可以被更简单地和更高效地除去。

纯化聚烯烃的方法

本发明涉及用于纯化聚烯烃的方法，所述方法包括使已经通过气相聚合合成的线性低密度聚乙烯与包含乙烯气体和惰性气体的净化气体在净化设备中接触的步骤。根据该纯化方法，余留的具有许多碳的烯烃单体可以被更简单地和更高效地除去。

Control methods and systems for polmer product purge

Disclosed herein are methods and systems for purging a polymer product of volatiles. The methods and systems are particularly useful in the purging of a polyethylene polymer product produced in a fluidized bed reactor.

Process for reducing the odor of ethylidene norbornene present in EPDM resin

A process for reducing the odor of ethylidene norbornene present in EPDM resin which comprises introducing a crystalline siliceous molecular sieve into said EPDM resin in an amount sufficient to reduce the odor produced by ethylidene norbornene present in said EPDM resin.

Method of reducing odor of composite resin particles, and composite resin particles

A method of reducing an odor of composite resin particles comprising the step of: fluidizing the composite resin particles, which contain a polyolefin-based resin and a polystyrene-based resin and which are used for producing an expanded molded article, in a container with a gas that is blown thereinto from its bottom and that has a temperature of (T−40)° C. to (T−10)° C. (T is a softening temperature of the composite resin particles), to reduce the odor generated from a raw material of the composite resin particles and generated according to a method of the composite resin particles, wherein the composite resin particles whose odor is reduced are impregnated with a blowing agent; and the resultant is pre-expanded and then subject to an in-mold forming to make the expanded molded article have an odor strength of 3 or less in average value in odor test in which odor of an isovaleric acid diluted 100000 times is defined as 3, which means a reference odor, within 0 to 5 levels of the odor strength.

Polymer devolatilization

A process has been invented for removing contaminants (including solvent) from a flowing polymer, the process, in one aspect, including dissolving a sparingly soluble stripping agent into a flowing polymer, the sparingly soluble stripping agent stripping contaminants from the flowing polymer creating a mixture of contaminants and sparingly soluble stripping agent, which flows out from the flowing polymer, and separating the mixture from the polymer. In one aspect, recyclable sparingly soluble stripping agent is recovered and re-used.

Process for the recovery of amorphous devaporized polyalphaolefin

A circulation loop is provided between a point next to the outlet of an amorphous polyalphaolefin polymerization zone and a flash zone, carrying a stream of molten devaporized polymer product.

Process for producing an amorphous alpha-olefin polymer

A circulation loop is provided between a point next to the outlet of an amorphous polyalphaolefin polymerization zone and a flash zone, carrying a stream of molten devaporized polymer product.

Polymerization process and arrangement

The disclosure relates to a polymerization process, comprising − providing a first hydrocarbon stream comprising first olefin monomer, first comonomer and solvent in a first providing step, wherein solvent is obtained from a solvent source; − combining the first hydrocarbon stream with hydrocarbons recycled from at least one downstream process step to a first combined hydrocarbon stream in a first combining step; − polymerizing the first olefin monomer and the first comonomer in the presence of a first polymerization catalyst in a first polymerization step in the solvent to produce a first solution comprising a first polymer of the first olefin monomer and the first comonomer; − withdrawing a first exhaust stream of the first solution in a first withdrawing step; − separating the first exhaust stream to a first primary hydrocarbon stream and a first concentrated solution stream in a first primary separation step; − recycling the first primary hydrocarbon stream to the first combining step in a first primary recycling step; − separating the first concentrated solution stream to a first secondary hydrocarbon stream and a first polymer product stream in a first secondary separation step; − recycling the first secondary hydrocarbon stream to the first combining step in a first secondary recycling step; − providing a second hydrocarbon stream comprising second olefin monomer, second comonomer and solvent in a second providing step, wherein the solvent is obtained from the solvent source; − combining the second hydrocarbon stream with hydrocarbons recycled from at least one downstream process step to a second combined hydrocarbon stream in a second combining step; − polymerizing the second olefin monomer and the second comonomer in the presence of a second polymerization catalyst in a second polymerization step in the solvent to produce a second solution comprising a second polymer of the second olefin monomer and the second comonomer; − withdrawing a second exhaust ...

엘라스토머 에틸렌/α-올레핀 공중합체를 위한 신규한 응결방지제

본 발명은 LCST 화합물에 의해 수성 매질 중의 엘라스토머 에틸렌/α-올레핀 공중합체 입자의 응결을 감소시키거나 방지하는 방법에 관한 것이다.

METHOD AND DEVICE FOR PREPARING A VINYLAROMATIC POLYMER

一种脱挥装置及san树脂脱挥工艺

本发明公开了一种脱挥装置及SAN树脂脱挥工艺，该装置的脱挥器的物料进口处设置有物料分布器，物料分布器上设多个开孔，所述开孔处设置有导流丝，所述导流丝上设置有倒刺；本发明的脱挥工艺采用两级串联脱挥器脱除挥发性组分，采用本发明的脱挥装置进行脱挥，物料成膜性好，得到的物料挥发分含量小，脱挥效率高。

减轻复合树脂颗粒的臭气的方法及复合树脂颗粒

一种减轻复合树脂颗粒的臭气的方法，包括以下步骤：在具有从其底部吹入气体的且气体的温度为(T-40)℃到(T-10)℃(T为所述复合树脂颗粒的软化温度)的容器中，流化含聚烯烃基树脂和聚苯乙烯基树脂并用于制备发泡模制品的所述复合树脂颗粒，以减轻由所述复合树脂颗粒的原材料产生及根据所述复合树脂颗粒的制备方法产生的臭气，其中用发泡剂浸渍臭气减轻的所述复合树脂颗粒；所得物经预发泡并然后经模内成形以制备在臭气试验中臭气强度平均值为3以下的发泡模制品，在所述臭气试验中，将稀释100000倍的异戊酸的臭气定义为臭气强度0～5级中的3，其表示参比臭气。

Fluidized bed product discharge process

FLUIDIZED BED PRODUCT DISCHARGE PROCESS ABSTRACT A process for reducing the odor of ethylidene norbornene present in EPDM resin which comprises introducing a crystalline siliceous molecular sieve into said EPDM resin in an amount sufficient to reduce the odor produced by ethylidene norbornene present in said EPDM resin.

Cooling and pelletizing process for semi-crystalline polymers

Methods and systems for pelletizing low molecular weight semi-crystalline polymers are provided herein. Polymer compositions comprising the semi-crystalline polymer and a solvent are provided to a devolatilizing device, where the solvent is at least partially evaporated under vacuum conditions, resulting in removal of heat from the polymer by evaporative cooling and crystallization of the polymer. Once the polymer has reached the desired temperature, the polymer exits the devolatilizer and is pelletized. Semi-crystalline polymers that may be used in the present invention include propylene-based copolymers, such as propylene-ethylene and propylene-hexene copolymers having a heat of fusion, Hf, from about 5 to about 75 J/g and a weight average molecular weight, Mw, from about 10,000 to about 200,000 g/mol.

Cooling and pelletizing process for semi-crystalline polymers

Un proceso de formación de pellas de un polímero semi-cristalino, comprendiendo el proceso: a. proporcionar un recipiente que tiene una entrada y una salida; b. introducir una primera composición polimérica que comprende un polímero semi-cristalino y un disolvente en la entrada del recipiente, en el que la primera composición polimérica está fundida, y en el que el polímero semi- cristalino es un polímero basado en propileno que incluye unidades derivadas de propileno y de un 5 % en peso a un 30 % en peso de unidades derivadas de etileno y/o alfa-olefinas C4-C12; c. someter la primera composición polimérica a vacío en el recipiente de forma que al menos una parte del disolvente se retira de la primera composición polimérica y la temperatura de la primera composición polimérica se reduce, formando una segunda composición polimérica que comprende el polímero semi-cristalino y que tiene un contenido de disolvente menor y una temperatura menor que la primera composición polimérica; d. descargar la segunda composición polimérica a partir de la salida del recipiente; e. alimentar la segunda composición polimérica a un dispositivo de formación de pellas; y f. descargar un producto polimérico sometido a formación de pellas a partir del dispositivo de formación de pellas, en el que la segunda composición polimérica comprende menor o igual que un 1 % en peso de disolvente, y la relación entre la temperatura de la segunda composición polimérica a la salida del recipiente (Tf) y la primera temperatura de cristalización del polímero semi-cristalino (Tc1) cumple la fórmula Tf <= Tc1 + 60 en la que Tf y Tc1 están en grados Celsius, y en el que el polímero semi-cristalino tiene un calor de fusión (DSC) dentro del intervalo de 0,5 J/g a menos de 80 J/g. A semi-crystalline polymer pelletizing process, the process comprising: a. providing a container having an inlet and an outlet; b. introducing a first polymeric composition comprising a semi-crystalline polymer and a solvent at ...

복합 수지 입자 중의 악취의 저감 방법 및 복합 수지 입자

폴리올레핀계 수지와 폴리스티렌계 수지를 함유하는 발포 성형체 제조용의 복합 수지 입자를, 용기 내에서 상기 용기 하부로부터 불어 넣어진 (T-40)℃~(T-10)℃의 기체(T는 상기 복합 수지 입자의 연화 온도)에 의해 유동시킴으로써 상기 복합 수지 입자의 원료 및 제법으로부터 유래하는 악취를 저감시키는 방법이며, 악취가 저감된 상기 복합 수지 입자에 발포제를 함침시킨 후 예비 발포시키고, 계속해서 형내 성형시켜 얻어진 발포 성형체의 악취 강도의 평균값이 100000배로 희석된 이소발레르산의 악취를 악취 강도 0~5단계 중 3을 기준 냄새로 하는 악취 시험에서 3 이하가 되는 복합 수지 입자 중의 악취의 저감 방법.

Method of preparing transition metal complex

본 발명은 올레핀 공중합체 제조용 전이금속 착체의 제조 방법에 관한 것으로서, 보다 구체적으로는 주기율표 상 4족의 전이금속; 시클로펜타디에닐 리간드; 및 승화 또는 단순한 필터로 정제 가능한 페놀류의 리간드 적어도 하나;를 포함한 전이금속 착체의 제조 방법에 관한 것으로서, 전이금속 착체를 제조함에 있어 할로겐, 특히 염소가 포함되지 않는데 특징이 있다. The present invention relates to a method for preparing a transition metal complex for preparing an olefin copolymer, and more particularly, to a transition metal of Group 4 on the periodic table; cyclopentadienyl ligand; and at least one ligand of phenols that can be purified by sublimation or a simple filter. It relates to a method for producing a transition metal complex, wherein halogen, particularly chlorine, is not included in the preparation of the transition metal complex.

聚合合成物的连续处理方法

一个连续处理以本体或溶液聚合法生产的橡胶改性苯乙烯系聚合合成物的方法，该合成物至少含１％（重量）橡胶组分，至少合总量为１６％（重量）的未反应单体及溶剂，该方法去包括在二段易挥发组分分离器内处理聚合合成物，每个分离器包括一个多管式预热器及一个挥发器，以便除去未反应的单体及其它易挥发组分，其中第一段处理后的合成物合３～１５％（重量）未反应单体及溶剂。

METHOD FOR SEPARATING VOLATILE COMPONENTS FROM REACTION MIXTURES OBTAINED BY HIGH PRESSURE POLYMERIZATION

Process for removing volatile components from an olefin polymer and article obtained

Method for purifying polyolefin

Provided is a method of purifying polyolefin, the method including the step of contacting linear low-density polyethylene synthesized by a gas phase polymerization reaction with a purge gas containing an ethylene gas and an inert gas in a purge bin. According to this purification method, residual alkene monomers with high carbon numbers may be removed in a simpler and more efficient manner.

Vacuum Devolatilizer

Provided is a vacuum devolatilizer for use in a polymer manufacturing or processing plant. The devolatilizer comprises a vacuum chamber having an inlet for a polymer melt, an outlet for a polymer melt, a vacuum port through which volatiles may be removed and a stirrer shaft port for the entry of a stirrer shaft. The stirrer shaft passes through the at least one stirrer shaft port and extends into the vacuum chamber and carries an agitation means. The stirrer shaft seal is associated with each stirrer shaft port for sealing against the stirrer shaft and each stirrer shaft seal has an external portion outside the vacuum chamber. The devolatilizer is provided with a motor located outside of the vacuum chamber for rotating shaft and comprises means for blanketing the external portion of the stirrer shaft seal with a low oxygen content gas or vapor, e.g., nitrogen, helium, steam, or carbon dioxide.

Low critical solution temperature purification of oxazoline polymer solutions

Provided are methods for the purification of polymer solutions. In particular, the method enables the separation of impurities from an oxazoline polymer solution by raising the temperature of the polymer solution above its lower critical solution temperature (LCST), wherein a water rich phase and a polymer rich phase separation occurs. The phases are then separated with the polymer rich phase containing a lower amount of impurities than before separation.

Process for purifying recycle gases from condensed polymer particles

Patent FR2460306B1

Devolatilising polymer melt

Water removal from polymers

Method of treating polyolefin

一种间歇式液相本体法制备聚丁烯合金工艺中voc的脱除方法

本发明属于树脂材料领域，尤其涉及一种间歇式液相本体法制备聚丁烯合金工艺中VOC的脱除方法，该方法包括以下步骤：a)原料物在聚合釜中进行聚合反应，生成聚丁烯合金粉料；b)向闪蒸釜内充入惰性气体和去活剂，然后将所述聚丁烯合金粉料喷入闪蒸釜中，之后将所述闪蒸釜内气相的温度控制在60～70℃；所述去活剂包括水蒸气、乙醇蒸气和甲醇蒸汽中的一种或多种；c)依次对所述闪蒸釜进行抽真空、充压和放空；d)重复进行步骤c)若干次，直至闪蒸釜内可燃气含量小于预设值。本发明通过在闪蒸置换气中掺加部分去活剂气体，保证了产品的热稳定性，减少了有机小分子的产生，从而降低了聚丁烯合金树脂产品中的VOC含量。

一种间歇式液相本体法制备聚丁烯合金工艺中voc的脱除方法

本发明属于树脂材料领域，尤其涉及一种间歇式液相本体法制备聚丁烯合金工艺中VOC的脱除方法，该方法包括以下步骤：a)原料物在聚合釜中进行聚合反应，生成聚丁烯合金粉料；b)向闪蒸釜内充入惰性气体和去活剂，然后将所述聚丁烯合金粉料喷入闪蒸釜中，之后将所述闪蒸釜内气相的温度控制在60～70℃；所述去活剂包括水蒸气、乙醇蒸气和甲醇蒸汽中的一种或多种；c)依次对所述闪蒸釜进行抽真空、充压和放空；d)重复进行步骤c)若干次，直至闪蒸釜内可燃气含量小于预设值。本发明通过在闪蒸置换气中掺加部分去活剂气体，保证了产品的热稳定性，减少了有机小分子的产生，从而降低了聚丁烯合金树脂产品中的VOC含量。

How to modify polymer rheology

Process for removing volatile components from olefin polymers and articles obtained

본 발명은 올레핀 중합체로부터 휘발성 성분을 제거하기 위한 공정에 관한 것으로서, 적어도 하나의 진공 탈기 구역을 포함하는 압출기에서 수행되는 공정이며, 상기 공정은: (a) 올레핀 중합체의 스트림을 압출기에 도입하는 단계; (b) 압출기에서 올레핀 중합체를 올레핀 중합체의 용융 온도보다 더 높지만 올레핀 중합체의 분해 온도보다는 낮은 온도에서 압출함에 따라, 휘발성 성분의 양이 감소된 올레핀 중합체 용융물을 제조하는 단계를 포함하되, 여기서 압출기에서의 공정은 수식 1에 의해 정의된 바와 같이 800 내지 4000 범위의 체류 시간 분포 폭 (σ 2 )을 갖는다; 여기서: σ 2 는 체류 시간 분포 폭이며, T는 평균 체류 시간이고, t는 올레핀 중합체의 유체 요소가 압출기에서 소비하는 체류 시간 간격이며, E(t)는 체류 시간 분포 함수이고, 여기서 공정은 올레핀 중합체의 용융물이 다이 구역(die zone)을 통해 펠리타이저(pelletizer)로 이동하여 수득된 올레핀 중합체를 펠릿화하는 단계 (c)를 임의로 포함한다. The present invention relates to a process for removing volatile components from olefin polymers, the process being carried out in an extruder comprising at least one vacuum degassing zone, the process comprising: (a) introducing a stream of olefin polymer into an extruder; (b) extruding the olefin polymer in an extruder at a temperature higher than the melting temperature of the olefin polymer but below the decomposition temperature of the olefin polymer, thereby producing an olefin polymer melt having a reduced amount of volatile components; wherein the process in the extruder has a residence time distribution width (σ 2 ) ranging from 800 to 4000 as defined by Equation 1; here: σ 2 is the residence time distribution width, T is the mean residence time, t is the residence time interval consumed by the fluid component of the olefin polymer in the extruder, E(t) is the residence time distribution function, wherein the process optionally comprises a step (c) in which the melt of the olefin polymer is passed through a die zone to a pelletizer to pelletize the olefin polymer obtained.

Methods for Modifying the Rheology of Polymers

The disclosure relates to a method for modifying the rheology of a polymer and a polymeric composition obtained by the method. The composition comprises at least one organic peroxide and water in emulsion form. The polymer may comprise a polyolefin. The method comprises extruding a molten polymer and the composition and removing volatile compounds from the molten polymer.

PROCESS FOR STEREOSPECIFIC RECYCLING OF A MIXTURE OF POLYMERS BASED ON PLA.

La présente invention se rapporte à un procédé de recyclage chimique stéréospécifique d'un mélange de polymères à base d'acide polyactique PLA, pour en reformer son monomère ou un des ses dérivés. Ces derniers pouvant entrer dans le marché traditionnel des lactates ou à nouveau servir comme matière première pour la synthèse de PLA. The present invention relates to a stereospecific chemical recycling process of a PLA polyacetic acid-based polymer mixture, for reforming its monomer or one of its derivatives. These can enter the traditional market of lactates or again serve as raw material for the synthesis of PLA.

Orthopaedic device for implantation in the body of an animal and method for making the same

A method of preparing a orthopaedic implant which includes removing low-molecular-weight compounds from a mass of polymeric material from which the implant is made.

Orthopaedic device for implantation in the body of an animal and method for making the same

A method of preparing a orthopaedic implant which includes removing low-molecular-weight compounds from a mass of polymeric material from which the implant is made.