СПОСОБ (СО)ПОЛИМЕРИЗАЦИИ ФТОРИРОВАННЫХ ОЛЕФИНОВЫХ МОНОМЕРОВ

Фторированные полимеры, имеющие высокую структурную однородность (упорядочность), отличающиеся высокой максимальной рабочей температурой, улучшенными механическими свойствами и лучшей перерабатываемостью, получают способом (со) полимеризации фторированных олефиновых мономеров, необязательно в сочетании с нефторированными олефинами в водной эмульсии в присутствии радикальных фотоинициаторов и при наличии видимой области ультрафиолетового излучения. 13 з.п.ф-лы, 1 табл.

СПОСОБ ПОЛУЧЕНИЯ ПОЛИМЕРОВ ВИНИЛИДЕНФТОРИДА

Описывается способ получения полимеров винилиденфторида (VDF), который включает полимеризацию VDF возможно в сочетании с другими фторсодержащими олефинами в водной среде в присутствии инициатора радикалов и 1,1, 1-трифтор-2,2-дихлорэтана (НСFС-123) в качеств агента передачи цепи. Технический результат заключается в том, что получают конечный продукт с очень хорошими характеристиками по цвету (внешний вид), по существу свободный от явлений пожелтения при повышенных температурах. 3 з.п.ф-лы, 2 табл.

СПОСОБ ИЗГОТОВЛЕНИЯ ПОЛИМЕРНОГО БИСЕРА ОДНОРОДНОГО РАЗМЕРА

Настоящее изобретение относится к способу получения бисера, обладающего однородным распределением частиц по размерам. Описан способ изготовления монодисперсною сшитого полимерного бисера, включающий следующие стадии: (а) введение капелек, обладающих гармоническим средним размером от 50 до 1500 мкм и включающих по меньшей мере один мономер, по меньшей мере один сшивающий агент и инициатор свободнорадикальной полимеризации, в водную среду в формирующую колонну через отверстия с получением водной суспензии капелек, обладающей объемной долей капелек от 35 до 64%, где эти капельки не инкапсулированы; в котором мономеры выбраны из группы, включающей моноэтиленовоненасыщенные соединения и полиэтиленовоненасыщенные соединения, моноэтиленовоненасыщенные мономеры выбирают из группы, включающей (мет)акриловые кислоты и их сложные эфиры, метилзамещенные стиролы, винилпиридины и виниловые сложные эфиры, простые эфиры и кетоны; (б) принуждение водной суспензии капелек двигаться вниз по трубе нисходящего ...

СПОСОБ ПОЛУЧЕНИЯ ФОРМОВАННЫХ ГИДРОГЕЛЕВЫХ ИЗДЕЛИЙ

Использование: в технологии получения формованных гидрогелевых изделий, в частности мягких контактных линз. Сущность: способ, включающий смешение гидрофильного (мет)акрилатного мономера, сшивающего агента и вытесняемого водой разбавителя с вязкостью, по меньшей мере, 100 МПа при 30oС, состоящего из эфира борной кислоты и двухатомных спиртов, когезионный полярный параметр Хансена (σp) и когезионный полярный параметр водородной связи Хансена (σh) которых охватываются зоной круга, расположенного в координатах σp и σh и имеющего центр при σh 20, 5, σp 13 и радиус, равный 8,5 в масштабе этих координат. 11 з. п. ф-лы, 3 ил., 7 табл.

ПОЛИМЕРЫ ИЗООЛЕФИНОВ И СПОСОБЫ ИХ ПОЛУЧЕНИЯ

Настоящее изобретение относится к способу полимеризации путем катионной полимеризации мономеров изоолефинов в водной реакционной среде и к (со)полимерам изоолефинов, получаемых этим способом. Способ включает следующие стадии: (1) формирование системы полимеризации и (2) полимеризацию системы полимеризации, полученной на стадии (1), для получения гомополимеров мономерных изоолефинов или сополимеров мономерных изоолефинов и необязательных мономеров, способных к сополимеризации. Система полимеризации включает следующие компоненты: систему инициирования, состоящую из инициатора, добавки, льюисовской кислоты и необязательного разбавителя, причем указанную добавку выбирают по меньшей мере из одного органического соединения, содержащего атом азота, кислорода, серы или фосфора; водную реакционную среду, в которой вода составляет 3.5-100 об.%; мономерные изоолефины и необязательно мономеры, способные к сополимеризации, и необязательный диспергент. Настоящее изобретение предлагает экономичный и простой ...

ВОДНАЯ ДИСПЕРСИЯ СИНТЕТИЧЕСКОЙ СМОЛЫ И СПОСОБ ЕЕ ПОЛУЧЕНИЯ

Водные дисперсии синтетических смол, содержащие: А) ионную смолу, предпочтительно катионную смолу, Б) блокированный полиизоцианат, и В) полимер по меньшей мере из одного радикально полимеризующегося этиленовоненасыщенного мономера. Эти дисперсии синтетических смол применяют в качестве связующего в ваннах для электролакирования погружением.

СПОСОБ ПОЛУЧЕНИЯ НИЗКОВЯЗКОЙ ВОДНОЙ ДИСПЕРСИИ НА ОСНОВЕ ВОДОРАСТВОРИМОГО ПОЛИМЕРА

Объектом изобретения является способ получения низковязкой полимерной дисперсии на основе водорастворимого полимера путем полимеризации по меньшей мере одного водорастворимого мономера и по меньшей мере одного гидрофобного мономера в присутствии по меньшей мере одного полимерного диспергатора и последующей обработки получаемой полимерной дисперсии, при этом обработку получаемой водной дисперсии осуществляют путем удаления воды с последующим смешиванием получаемой концентрированной дисперсии с водной дисперсией по меньшей мере одного полимерного диспергатора.

Многокамерный полимеризатор непрерывного действия для проведения жидкостных и газожидкостных процессов

Способ получения полиэлектролитов

Способ получения поливинилиденфторида

Wässrige Dispersion einer amphoten wasserlöslichen Polymers, Verfahren zu seiner Herstellung und diese enthaltende Behandlungsmittel

Wässrige Colpolymere Verdicker-Mischungen

PROCESS FOR PRODUCTION OF STERICALLY STABILISED, WHOLLY NON-CHARGED AQUEOUS POLYMER DISPERSIONS

VERFAHREN ZUR ENZYMATISCHEN INITIIERUNG DER VINYLPOLYMERISATION

HOCHWETTERBESTÄNDIGE EINKOMPONENTARTIGE VERNETZBARE EMULSION

Verfahren zur Herstellung von Polyvinylalkohol-stabilisierten Polymerisaten

POLYMERE VERDICKUNGSMITTEL UND VERFAHREN ZUR HERSTELLUNG.

Verwendung von Styrol/Acrylnitril-Polymerpolyolen enthaltend teilweise alkoxylierte Polyoxyalkylenamine.

Herstellung von syndiotaktischem 1,2-Polybutadien in wässrigem Medium.

Verfahren zur Herstellung von sterisch stabilisierten, emulgatorfreien, wäßrigen Polymer-Dispersionen und daraus hergestellten Pulvern zum Einsatz in Baustoffen

LATEXZUSAMMENSETZUNGEN AUS SEHR KLEINEN TEILCHEN, IHRE ANWENDUNG ZU ANSTRICHMASSEN OHNE LÖSUNGSMITTEL

AN IMPROVED PROCESS FOR FORMING EMULSION/SUSPENSION POLYMERS AND POLYMERS SO FORMED

"VERFAHREN ZUR HERSTELLUNG EINES KATIONISCHEN POLYMEREN FLOCKUNGSMITTELS VOM ACRYLAMIDTYP"

VERFAHREN ZUR HERSTELLUNG EINER VINYLACETATHARZEMULSION UND EINES KLEBSTOFFES AUF WASSERBASIS

Verwendung von wäßrigen Dispersionen als Heißsiegelkleber

Redox-Initiatorsystem für die radikalische Polymerisation und dessen Verwendung

PROCESS FOR THE MANUFACTURE OF SPECK-FREE DISPERSIONS OF COPOLYMERS

... 1339074 Emulsion copolymerization CHEMISCHE WERKE HULS AG 19 April 1971 [2 April 1970] 25826/71 Heading C3P Emulsion co-polymerization of at least one plasticizing component and at least one component which imparts hardness is effected in the presence, as sole emulsifier, of 0À3-4À0 wt. per cent (relative to monomer mixture) of a mono- or di-salt of an -sulpho-C 10-20 fatty acid, or a salt of an ester of such an acid with a C 1-3 alcohol. The monomer mixtures suitably comprise (i) styrene or a derivative thereof, or a mixture of a styrene with up to 40% of acrylonitrile, and (ii) a conjugated diene or a C 4-8 alkyl ester of (meth)acrylic acid. Up to 5% of other monomers may also be present, particularly acrylic acid and/or acrylamide. In examples the following copolymers are made: styrene / butadiene / acrylic acid, styrene / butadiene, styrene / 2 - ethylhexyl acrylate / acrylic acid, styrene / acrylonitrile / butadiene acrylic acid, and styrene/butadiene/acrylamide/ acrylic acid. The ...

CARBOXYLATED LATEX

Process for making vinyl aryl polymers

Vinyl aryl polymer beads are prepared by polymerizing one or more vinyl aryl monomers while suspended in water containing zinc oxide as the suspending agent, the polymerization being initiated while the aqueous phase of the suspension is at a pH of at least 9.3 and the pH being maintained above 7.0 throughout the polymerization. The vinyl aryl monomer may be styrene, vinyl toluene, vinyl xylene, or -ethylvinylbenzene, divinylbenzene, isopropyl styrene, tert.-butyl styrene, o- or p-monochlorostyrene, a dichlorostyrene or a mixture of one or more thereof with not more than 50% by weight of ethyl acrylate, methyl methacrylate, acrylonitrile, vinyl propionate, or acrylic or methacrylic acids. The pH may be maintained basic by means of tri- or di-sodium phosphate, sodium oleate, or ammonium or sodium hydroxides. The monomer suspension may contain a flameproofing agent, e.g. 1,2-dibromo-tetrachloro-ethane, monochloro-pentabromo-cyclohexane or tris(2,3-dibromo-propyl) phosphate. Benzoyl and dicumyl ...

AQUEOUS DISPERSIONS

Aqueous coating composition containing resin particles

An aqueous coating composition comprises, as resinous vehicle, (1) an aqueous composition containing resin particles obtained by polymerizing at least one ???,???-ethylenically unsaturated monomer in an aqueous medium and in the presence of an aqueous resin (A) with the help of an organic initiator, and (2) an aqueous resin (B) having a water tolerance of 4 or more and a surface tension of 1% aqueous resin varnish of 51 dyne/cm or less, the solid weight ratio of said resin particles to the total aqueous resins (A)+(B) being 70-1:30-99. The monomer may be in admixture with a hydrophobic solvent and/or a hydrophobic resin during the polymerization. The coating composition has excellent storage stability and application characteristics and is capable of forming a coating with excellent film properties, and hence is particularly useful as a top coat for automobile bodies and the like.

Aqueous dispersion of polymers

This invention relates to aqueous dispersions of synthetic polymer particles, particularly those used as film-forming media in surface coating compositions. The problem of maintaining under moist conditions the adhesion to a substrate of a film formed from a surface coating composition having such an aqueous dispersion as a film former can be substantially overcome by using a dispersion wherein the film-forming polymer comprises (a) polar groups selected from amine, ureido and thioureido groups (b) a proportion of monomer units derived from acrylamide and methacrylamide, and (c) a proportion of poly(alkylene oxide). The proportions of these components present by weight of the film-forming polymer are at least 0.3% of (a), at least 0.3% of (b), at least 0.5% of (c) and from 1.4-9.0% of (a)+(b)+(c). These aqueous polymer dispersions may be used in interior or exterior surface coatings.

PROCESS FOR PRODUCING IMPACT-RESISTANT GRAFT POLYMERS

High solids latex

A high solids latex of a functional monomer may be prepared by emulsion polymerization of the monomer charge to a specified overall conversion and then introducing an additional micelle forming surfactant or a unimodal seed latex and continuing the polymerization.

HIGH SOLIDS LATEX

POLYMERISATION OF VINYL AND VINYLIDENE COMPOUNDS

... 1326713 Polymerization process BADISCHE ANILIN- & SODA-FABRIK AG 6 Jan 1971 [7 Jan 1970] 575/71 Heading C3P In the homo-polymerization of vinyl chloride, vinylidene chloride or vinyl acetate (M) or copolymerization of two or all of these in bulk, suspension or emulsion there is added at times and in amounts to prevent excessive heat generation a copolymerizable monomer (R) containing at least one carbon-carbon, carbonoxygen or carbon-nitrogen multiple or aromatic bond conjugated with the polymerizable bond in which the copolymerization parameter r R is not less than 1, r M is less than one and r R : r M is more than 20 : 1 in a total amount of not more than 0À1% based on monomers. The copolymerizable monomer (R) is preferably added in solution, e.g. in methanol, and the addition is repeated as necessary to maintain the temperature below the desired maximum. In examples vinyl chloride is polymerized in suspension and there are added as regulators (1) alpha-methyl styrene, (2) isopropenyl ...

AQUEOUS COATING COMPOSITION

Improvements in or relating to the polymerization of monovinyl aromatic compounds and aliphatic conjugated diolefines

Aliphatic conjugated diolefines such as butadiene, isoprene, or 2,3-dimethylbutadiene, and monovinyl aromatic compounds such as styrene, o-chlorostyrene, p-chlorostyrene, o-ethyl styrene, m-ethyl styrene, or p-isopropyl styrene are polymerized, or copolymerized in the presence or absence of other polymerizable compounds such as vinyl acetate, by heating at 50 DEG to 150 DEG C. in an aqueous emulsion of a pH of 1.5 to 3 in the presence of a peroxy catalyst and 0.01 to 500 parts of iron in the form of an iron salt per million parts of monomeric material. Peroxy catalysts specified are hydrogen, sodium and barium peroxides, ammonium, sodium and potassium persulphates, and peracetic acid; iron salts specified are ferric nitrate, sulphate, chloride and acetate, and ferrous chloride and sulphate. Emulsifying agents specified are the sodium salt of sulphonated sperm oil, the alkali metal sulphonates of aliphatic and alkyl aromatic hydrocarbons of high molecular weight, and egg albumen. The molecular ...

SELF-EXTINGUISHING RESIN COMPOSITIONS

... 1,211,254. Self-extinguishing polymer compositions. DOW CHEMICAL CO. 10 Jan., 1968, No. 1481/68. Headings C3P and C3G. A self-extinguishing composition comprises a polymer of at least one vinyl aromatic compound and 0À1-5% by wt. of a bromine containing mixed alkenyl-aryl ether wherein the hydrogen atoms on the olefinic carbon atoms in the alkenyl group are replaced by bromine atoms, the alkenyl group containing 3 or 4 carbon atoms, the other hydrocarbon radical of the ether molecule attached to the ether oxygen atom consisting of a triphenylmethyl radical or a halogen-substituted aryl radical. The polymer may be polystyrene or a high impact styrene polymer containing 2-20% of polybutadiene or a butadiene-styrene copolymer and 98-80% styrene. The ether may be a (bromo - allyl or a bromo - butenyl) - (bromophenyl or bromo-naphthyl) ether, or a bromo- or chloro - (bromoalloxy) phenyl - propane. The compositions may be made by dissolving the ether in the monomer, e.g. styrene, which is then ...

VINYL HALIDE POLYMERISATION IN COATED REACTOR

Combined emulsion and suspension process for producing graft ABS bead-like particles

A method of preparing a graft ABS polymer comprising first preparing a rubbery graft ABS polymer by emulsion polymerizing acrylonitrile and styrene in the presence of a rubber, coagulating the emulsion and then polymerizing a mixture of acrylonitrile and styrene in the presence of the coagulant and an organic or inorganic suspending agent to form bead-like particles of ABS.

PREPARATION OF VINYL CHLORIDE POLYMERS

PROCESS FOR PREVENTING WALL DEPOSITS DURING VINYL CHLORIDE POLYMERISATION

... 1487516 Polymerizing vinyl chloride CHEMISCHE WERKE HULS AG 7 Feb 1975 [8 Feb 1974] 5239/75 Heading C3P Deposits on reactor walls in the aqueous medium polymerization of vinyl chloride are prevented by coating or lining the walls of the reactor with nickel or using a reactor made of nickel.

Process for the suspension polymerisation of vinylidene aromatic compounds

Vinylidene aromatic compounds are polymerized to granular form in suspension in an aqueous medium containing (a) a water-soluble, partially hydrolysed (i.e. at least 8% ester groups), polymer of a vinyl ester of a monocarboxylic acid and (b) an aromatic sulphonic acid or water-soluble salt thereof having up to four aromatic rings in the molecule, and free from substituents other than alkyl groups of more than four carbon atoms, the total number of carbon atoms in such groups not exceeding eight, and the process may be carried out in the presence of from 2-20% by weight of low-boiling aliphatic hydrocarbons. Styrene, a -methyl- and ethylstyrene, a -methyl vinyl toluene, a -methyl dialkyl styrenes, vinyl toluene, o and p-ethylstyrene, 2, 4-dimethyl- and dichloro-styrenes, o and p-chlorostyrenes, o-bromostyrene, 2-chloro-4-methyl and 2, 6-dichloro-4-methyl styrenes, vinyl naphthalene and anthracene, and divinyl benzene are polymerized alone or with compounds such as butadiene, isoprene, acrylic ...

INDENE AND COUMARONE CONTAINING COPOLYMERS

PROCEDURE FOR THE PRODUCTION OF A WAESSERIGEN EMULSION OR DISPERSION AND YOUR ALLFAELLLIGE FURTHER TRANSFORMATION

VERFAHREN ZUR HERSTELLUNG EINER WAESSERIGEN EMULSION ODER DISPERSION UND IHRE ALLFAELLLIGE WEITERE UMWANDLUNG

VERFAHREN ZUR POLYMERISATION VON VINYLCHLORID

PROCEDURE FOR THE PRODUCTION OF WATER-ABSORBING POLYMER PARTICLES BY POLYMERIZATION OF DROPS OF A MONOMER SOLUTION

ßTEILCHEN FROM INTERLACED RESIN, DISPERSION RESIN FOR USE WITH the PRODUCTION of the PARTICLES FROM INTERLACED RESIN AND PROCEDURES FOR the PRODUCTION of the PARTICLES FROM INTERLACED HARZß, INTERLACED BY PARTICLES FROM

PRODUCTION OF POLYMERS IN A CONICAL REACTOR

POLYMERISATIONSREAKTOR

VERFAHREN ZUR HERSTELLUNG EINES KATIONISCHEN POLYMEREN FLOCKUNGSMITTELS VOM ACRYLAMID-TYPUS

VERFAHREN ZUR HERSTELLUNG SELBSTVERNETZENDER LACKE

PROCEDURE FOR THE PRODUCTION MECHANICAL OF STABLE OF WATER-ABSORBING POLYMER PARTICLES

PROCEDURE FOR THE PRODUCTION OF DISPERSIONS BY EMULSION POLYMERIZATION OF VINYLESTERN

PROCEDURE FOR THE PRODUCTION OF AN AQUEOUS ONE KUNSTSTOFFDISPERION

PROCEDURE FOR THE PRODUCTION OF VINYLIDENEFLUORIDEPOLYMEREN

PROCEDURE FOR THE PRODUCTION OF NEW THERMAL PLASTIC TERPOLYMERISATE

USE OF POLYVINYL CHLORIDE POWDERS FOR THE PRODUCTION OF BATTERY SEPARATORS

POLYOXAZOLIDINE WITH GROUPS OF CARBONATES, PROCEDURE FOR YOUR PRODUCTION AND YOUR APPLICATION

PROCEDURE FOR THE PRODUCTION OF POLYMER PARTICLES.

MULTICOLORED STONE FINERY ON SYNTHETIC RESIN BASIS.

PROCEDURE FOR THE COVERING OF ELECTRICALLY LEADING SUBSTRATES AND A KATIONI BONDING AGENT ABSTENTION AQUEOUS COMPOSITION.

VERFAHREN ZUR HERSTELLUNG EINES VINYLCHLORIDPOLYMEREN

PROCEDURE FOR THE POLYMERIZATION WITH A REDOX INITIATOR SYSTEM FOR THE PRODUCTION OF STERISCH STABILIZED ONES, NOT CHARGES, WAESSRIGEN POLYMER DISPERSIONS.

PROCEDURE FOR THE PRODUCTION OF GRANULAR KOPOLYMERE WITH FUNCTIONS THROUGH SUSPENSION POLYMERIZATION IN NICHTWAESSRIGEM MEDIUM.

PROCEDURE FOR THE PRODUCTION OF STERISCH STABILIZED ONE, NICHTGELADENEN WAESSRIGEN POLYMER DISPERSIONS.

POLYMERIZATION PROCEDURE FOR THE PRODUCTION OF NICHTWAESSRIGER DISPERSIONS OF MICRO PARTICLES AND COAT COMPOSITIONS; THESE MICRO PARTICLES CONTAINING.

PROCEDURE FOR THE PRODUCTION OF WAESSRIGEN POLYMER DISPERSIONS.

PROCEDURE FOR THE PRODUCTION OF IN WATER DISPERSE-CASH OF POLYMETHAN/AKRYLPOLYMER COMPOSITIONS.

PARTICLE OF HYDROPHOBEN POLYMERS, THE CAVITIES CONTAINING.

PROCEDURE FOR THE PRODUCTION OF WATER-SOURCECASH PRODUCTS USING PURIFYING PORTIONS OF WATER-SOURCECASH OF POLYMERE ONES.

AQUEOUS PRESSURE-SENSITIVE ONES ADHESIVE COMPOSITIONS.

WATER-ABSORBING RESINS, PROCEDURES FOR THEIR PRODUCTION AND THEIR USE WITH THE PRODUCTION OF WAESSRIGEN FLUID-ABSORBING ARTICLES.

PROCEDURE FOR THE PRODUCTION OF A POLYPYRROL LATEX AND USE OF THESE LATEX FOR THE PRODUCTION OF FILMFOERMIGER LEADERS.

PROCEDURE FOR THE PRODUCTION OF COPOLYMERS FROM MALEIC ACID ANHYDRIDE AND ALKENES.

PROCEDURE FOR THE PRODUCTION OF A LATEX OF VINYL ACETATE OLEFIN COPOLYMERS.

AQUEOUS SYNTHETIC RESIN DISPERSION

PROCEDURE FOR THE PRODUCTION OF AQUEOUS POLYMERE COMPOSITIONS

PROCEDURES FOR THE PRODUCTION OF STERISCH STABILIZED ONES, EMULSIFYING AGENT-FREE, AQUEOUS ONE POLYMER DISPERSIONS AND FROM THIS MANUFACTURED POWDERS FOR THE APPLICATION IN BUILDING MATERIALS

PROCEDURE FOR THE PRODUCTION OF AQUEOUS STYRENE BUTADIENE POLYMER DISPERSIONS II

PROCEDURE FOR THE DISTANCE OF OXYGEN FROM AQUEOUS MONOMER SOLUTIONS

USE OF ATOMIC TRANSMISSION RADICAL POLYMERIZATION TO AQUEOUS POLYMERIZATION SYSTEMS

PROCEDURE FOR MANUFACTURING WAESSERIGEN PLASTIC DISPERSIONS

PROCEDURE FOR THE PRODUCTION OF PARTICLES AND PARTICLE WITH THE HELP OF OF THIS PROCEDURE MANUFACTURED ABILITY

Procedure for the production of Vinylpolymeren

PROCEDURE FOR THE PRODUCTION OF AQUEOUS DISPERSIONS OF COPOLYMERS FROM HYDROPHILIC ONES AND HYDROPHOBEN MONOMERS

A PROCESS TO PRODUCE AN AQUEOUS COMPOSITION

Hollow microparticles

Dispersions containing living radicals

STABLE DISPERSIONS CONTAINING POLYELECTROLYTES

Process for producing water-soluble anionic dispersion polymers

Method of increasing retention and drainage in papermaking using high molecular weight water-soluble anionic or nonionic dispersion polymers

POLYMERISATION PROCESS FOR VINYL HALIDE MONOMER

Polymers and polymerisation processes

A method of manufacturing particles, and particles that can be produced in accordance with the method

Aqueous thickener compostion and process for making same

AQUEOUS COATING COMPOSITIONS

METHOD FOR CONTROLLING SIZE DISTRIBUTION OF POLYMER PARTICLES DURING PREPARATION OF AQUEOUS POLYMER DISPERSION AND AQUEOUS POLYMER DISPERSION

The present disclosure relates to a method for controlling size distribution of formed polymer particles during preparation of aqueous polymer dispersion. The method comprises obtaining an aqueous polysaccharide solution, which comprises about 10 to 40 weight-% polysaccharide containing a free hydroxyl group, such as starch, and polymerising in the polysaccharide solution in the presence of a graft-linking, water-soluble redox system about 30 to 60 weight-% of at least one optionally substituted styrene, about 60 to 30 weight-% of at least one C1-C4-alkyl (meth)acrylate, and 0 to about 10 weight-% of other ethylenically unsaturated copolymerizable monomers. The size distribution of the formed polymer particles is controlled by adjusting viscosity of the polysaccharide solution before the polymerisation to a level less than about 20 mPas. The present disclosure relates also to an aqueous polymer dispersion having the D(99) value less than about 160 nm for polymer particles in the polymer dispersion and its use. 1. A method for controlling size distribution of formed polymer particles during preparation of an aqueous polymer dispersion , comprising: '(a) about 10 to 40 weight-% of polysaccharide containing a free hydroxyl group, such as starch,', 'obtaining an aqueous polysaccharide solution, which comprises'} (b) about 30 to 60 weight-% of at least one optionally substituted styrene,', '(c) about 60 to 30 weight-% of at least one C1-C4-alkyl (meth)acrylate,', '(d) 0 to about 10 weight-% of other ethylenically unsaturated copolymerizable monomers,, 'polymerising in the polysaccharide solution in the presence of a graft-linking, water-soluble redox system'}wherein the sum of (a)+(b)+(c)+(d) is 100%,wherein the size distribution of the formed polymer particles is controlled by adjusting viscosity of the polysaccharide solution before the polymerisation to a level less than about 20 mPas, measured at about 23° C. with Brookfield LVDV viscometer with spindle 18, 60 rpm.2. ...

Nucleation in Aqueous Polymerization of Fluoromonomer

A process is provided for polymerizing fluoromonomer in an aqueous medium, wherein a dispersion of essentially surfactant-free hydrocarbon-containing oleophilic nucleation sites is first formed in the aqueous medium, and then polymerization is commenced to form a dispersion of fluoropolymer particles at the oleophilic nucleation sites, wherein the nucleation sites can be derived from hydrocarbon-containing compound. The surfactant used to stabilize the fluoropolymer dispersion can also be hydrocarbon-containing. 1. Process for polymerizing fluoromonomer in an aqueous medium in a polymerization reactor , comprising forming a dispersion of hydrocarbon-containing oleophilic nucleation sites in said medium , said dispersion being essentially free of surfactant and thereafter kicking off said polymerizing of said fluoromonomer to form a dispersion of fluoropolymer particles at said oleophilic nucleation sites.2. Process of wherein said nucleation sites are the product of degrading a water-soluble hydrocarbon-containing compound that contains hydrophobic moiety claim 1 , whereby said nucleation sites are hydrocarbon containing.3. The process of wherein said hydrocarbon-containing compound is a surfactant which contains hydrophilic moiety and said hydrophobic moiety claim 2 , said degrading being effective to enable said compound to enable said hydrophobic moiety to provide said oleophilic nucleation sites.4. The process of wherein said hydrocarbon-containing compound is present in said aqueous medium in an amount no greater than 50 ppm.5. The process of wherein at the time of said degrading claim 2 , water-soluble inorganic salt is also present in said aqueous medium to aid in the formation of said dispersion of hydrocarbon-containing oleophilic nucleation sites.6. The process of wherein that amount of said salt in said aqueous medium is no greater than 125 ppm and the amount of hydrocarbon-containing compound in said aqueous medium is no greater than 50 ppm.7. The ...

ENZYME-ASSISTED ATRP PROCEDURES

Materials and methods for conducting an atom transfer radical polymerization in the presence of oxygen by interlocking enzymatic activities are provided herein. 1. A method for polymerizing free radically copolymerizable monomers , comprising combining:(a) a deoxygenated polymerization medium comprising (i) a transition metal catalyst or metal-free organic complex that can participate in a redox reaction, and (ii) an initiator comprising one or more redox transferable atoms or groups;(b) an oxygen scavenger; and(c) a reactive oxygen species (ROS) scavenger.2. The method of claim 1 , wherein the polymerization medium is an aqueous medium.3. The method of claim 1 , wherein the method is carried out in a reactor with a limited head space comprising air.4. The method of claim 1 , wherein the method is carried out in a reactor open to the atmosphere.5. The method of claim 1 , wherein the oxygen scavenger comprises glucose and glucose oxidase (GOx).6. The method of claim 1 , wherein the ROS scavenger comprises one or more of pyruvate claim 1 , horseradish peroxidase claim 1 , an α-keto-acid claim 1 , catalase claim 1 , and a catalase-like enzyme selected from the group consisting of ascorbate peroxidase claim 1 , cytochrome C peroxidase claim 1 , haloperoxidase claim 1 , hemoprotein claim 1 , glutathione peroxidase claim 1 , glucose oxidase claim 1 , laccase claim 1 , monoamine oxidase claim 1 , cytochrome P450 oxidase claim 1 , NADPH oxidase claim 1 , xanthine oxidase claim 1 , L-gulonolactone oxidase claim 1 , and superoxide dismutase.7. The method of claim 1 , wherein the oxygen scavenger comprises glucose and GOx claim 1 , and wherein the ROS scavenger comprises one or more of pyruvate claim 1 , horseradish peroxidase claim 1 , an α-keto-acid claim 1 , catalase claim 1 , and a catalase-like enzyme selected from the group consisting of ascorbate peroxidase claim 1 , cytochrome C peroxidase claim 1 , haloperoxidase claim 1 , hemoprotein claim 1 , glutathione peroxidase ...

PROCESS FOR MANUFACTURING A DISPERSION OF A VINYLIDENE FLUORIDE POLYMER

A process for manufacturing a dispersion of a vinylidene fluoride (VDF) thermoplastic polymer [polymer (F)], said process includes polymerizing VDF in an aqueous phase that includes: at least one surfactant selected from the group consisting of non-fluorinated surfactants [surfactant (HS)] and fluorinated surfactants having a molecular weight of less than 400 [surfactant (FS)]; and at least one functional (per)fluoropolyether (functional PFPE) comprising at least one (per)fluoropolyoxyalkylene chain [chain (R′)] and at least one functional group, said functional PFPE having a number average molecular weight of at least 1000 and a solubility in water of less than 1% by weight at 25° C., wherein said functional PFPE is present in the aqueous phase in an amount of 0.001 to 0.3 g/l. 114.-. (canceled)15. A process for manufacturing a dispersion of a vinylidene fluoride (VDF) thermoplastic polymer [polymer (F)] , said process comprising polymerizing VDF in an aqueous phase comprising: [ {'br': None, 'sub': f', '2', '2', 'k-1', '2', 'a, 'R—(OCFCF)—O—CF—COOX\u2003\u2003(IA)'}, 'surfactant (FS) complying with formula (IA) here below, {'sub': f', '1', '3', 'a', '4', '1', '3, 'sup': N', 'N, 'wherein Ris a C-Cperfluoroalkyl group comprising, optionally, one or more ether oxygen atoms, k is 2 or 3 and Xis selected from a monovalent metal and an ammonium group of formula NR, wherein R, equal or different at each occurrence, is a hydrogen atom or a C-Calkyl group; and'}, {'br': None, 'sub': FS', 'r, 'R-E-Y'}, 'surfactant (FS) complying with formula, {'sub': 'r', 'wherein: Yis an anionic functionality;'}, {'sub': 4', '24, 'wherein E is a C-Chydrocarbon non fluorinated divalent group, possibly comprising one or more catenary oxygen atom(s); and'}, {'sub': FS', 'f', 'f', '2', 'f', 'r', 'f', '1', '6, 'sup': FS', 'FS', 'FS', 'FS, 'wherein Ris a —ORgroup, a —N(R), or a —OAr(R)group, wherein R, equal to or different from each other at each occurrence, is a C-Cperfluoroalkyl group, Ar is ...

METHOD FOR PRODUCING MODIFIED POLYTETRAFLUOROETHYLENE, METHOD FOR PRODUCING MODIFIED POLYTETRAFLUOROETHYLENE POWDER, AND METHOD FOR PRODUCING STRETCHED POROUS MATERIAL

To provide a novel method for producing a modified PTFE. 1. A method for producing a modified polytetrafluoroethylene , which comprises polymerizing tetrafluoroethylene in an aqueous medium in which a polymer comprising units based on a fluorine-free monomer is present.3. The method according to claim 1 , wherein the content proportion of the units based on a fluorine-free monomer in the polymer is from 90 to 100 mass % to the total amount of monomer units which the polymer contains.4. The method according to claim 1 , wherein to the total amount of tetrafluoroethylene which is supplied to the polymerization system claim 1 , the proportion of the polymer is from 0.001 to 0.050 mass %.5. The method according to claim 1 , wherein tetrafluoroethylene is polymerized in the presence of a fluorine-free surfactant.6. The method according to claim 5 , wherein the fluorine-free surfactant is a hydrocarbon type surfactant.7. The method according to claim 5 , wherein the amount of the fluorine-free surfactant in the aqueous medium claim 5 , as expressed as a proportion to the total amount of tetrafluoroethylene which is supplied to the polymerization system claim 5 , is from 0.01 to 0.50 mass %.8. The method according to claim 1 , wherein tetrafluoroethylene is polymerized in the presence of a stabilizing aid.9. The method according to claim 1 , wherein the fluorine-free monomer is polymerized in an aqueous medium claim 1 , and then in the obtained aqueous medium containing the polymer claim 1 , tetrafluoroethylene is polymerized.10. The method according to claim 9 , wherein tetrafluoroethylene is polymerized by adding a polymerization initiator to the aqueous solution in which the fluorine-free monomer is polymerized claim 9 , in such an amount that the proportion of the polymerization initiator becomes to be at least 0.10 mass % to the total amount of tetrafluoroethylene which is supplied to the polymerization system.11. The method according to claim 9 , wherein ...

POLYMERIZATION PROCESS

Provided is a method of forming a polymer, comprising (a) providing a reaction mixture comprising (i) one or more vinyl monomers, (ii) one or more pH-sensitive inhibition systems, (iii) one or more initiators, and (iv) water; (b) establishing conditions in said reaction mixture such that a free radical polymerization of said vinyl monomer occurs at a location, and (c) after steps (a) and (b) and prior to completion of said free radical polymerization, changing the pH of said reaction mixture to increase the rate of generation of said free radical polymerization at the location of said free radical polymerization. 1. A method of forming a polymer , comprising (i) one or more vinyl monomers', '(ii) one or more pH-sensitive inhibition systems', '(iii) one or more initiators', '(iv) water, '(a) providing a reaction mixture comprising'}(b) establishing conditions in said reaction mixture such that a free radical polymerization of said vinyl monomer occurs at a location, and(c) after steps (a) and (b) and prior to completion of said free radical polymerization, changing the pH of said reaction mixture to increase the rate of generation of said free radical polymerization at the location of said free radical polymerization.2. The method of claim 1 , wherein said free radical polymerization is a suspension polymerization.3. The method of claim 1 , wherein said pH-sensitive inhibition system comprises one or more inhibitor selected from the group consisting of phenol claim 1 , derivatives of phenol claim 1 , and derivatives of a nitrite salt.4. The method of claim 1 , wherein said pH sensitive inhibition system comprises a nitrite salt.5. A method of forming a polymer claim 1 , comprising (i) one or more vinyl monomers, located at a monomer location,', '(ii) one or more pH-sensitive inhibition systems,', '(iii) one or more initiators', '(iv) water, '(a) providing a reaction mixture comprising'}wherein the amount of any buffer in said reaction mixture is 0 to 0.1% by weight ...

Polyacrylonitrile process

An improved method of producing a polyacrylonitrile extrusion solution particularly suited for the production of shaped articles, especially fibers, which eliminates several process steps previously associated with the polymerization of the acrylic polymer and the subsequent formation of the extrusion solution. The method is particularly applicable to high acrylic polymers such as those containing more than about 85 percent acrylonitrile wherein the polymers are formed by aqueous suspension polymerization methods. The wet acrylic polymer produced is directly used in an extrusion process by solvating the polymer with a lower alkyl nitrile, such as acetonitrile, to form the extrusion solution. The solvation is accomplished by adjusting the polymer water content to about 1 to 40 percent by weight of the polymer, adding sufficient acetonitrile to provide a polymer-solvent mixture of 20 to 70 percent of polymer solids by weight and subsequently heating the mixture under at least autogeneous pressure to above the atmospheric boiling point of the solvent to form a homogeneous polymer solution.

Redox polymerization process

ACRYLIC POLYMERS HAVE BEEN PREPARED IN GOOD YIELDS EMPLOYING A REDOX CATALYST SYSTEM COMPOSED OF A MIXTURE OF HYPOCHLORITE AND CHLORITE IONS IN SOLUTION ACTIVATED IN AN OXIDIZABLE SULFOXY COMPOUND. THE POLYMERIZATION IS ENHANCED BY SMALL AMOUNTS OF HEAVY METAL SEQUESTERING AGENTS.

Sodium borohydride as a polymerization inhibitor for a redox system

Improved process for preparing acrylonitrile polymer melts

Polymerization process

It is possible to remove quantities of heat from exothermically running polymerization reactions of vinyl monomers in heterogeneous phase, in a sophisticated manner by adding liquids to the reaction medium for the removal of heat and to regulate the reaction temperature, which liquids do not dissolve the polymer under the reaction conditions and the boiling temperatures of which are lower than or are identical to the technically predetermined reaction temperatures under the polymerization conditions which are applied, and the heat which is released in the reaction system is removed by evaporating these liquids.

VDF POLYMERIZATION PROCESS

Process for continuously manufacturing polymer dispersions under pressure

1. Process for the preparation of polymer dispersions by the continuous polymerisation of gaseous or gaseous and liquid monomers in the presence of a liquid phase in a pressure reactor, the degree of filling of which is maintained constant, characterized in that the degree of filling is continuously determined by regularly recurring pressure changes produced in the reactor at a constant initial pressure and a constant temperature, and the addition of monomers and the liquid phase and/or the removal of the reaction products is respectively increased or decreased using an automatic measuring and control system, to such an extent that the degree of filling of the reactor remains constant.

Technique for reducing polymer deposit during polymerization in aqueous dispersion

Polymer deposit or build-up on the interior surfaces of a polymerization vessel during polymerization of monoethylenically unsaturated monomers in aqueous dispersion may be inhibited by adding certain heterocyclic compounds to the dispersion prior to polymerization.

Improved coating and coating composition

Addn. of initiators to polymerisation systems - by introducing the initiators into a water-filled feed pipe and gradually injecting them into the reactor over 20 minutes using water

A process is claimed for the addn. of a polymerisation initiator (I) for the aq. suspension or emulsion polymerisation of monomers; and involves introducing (I), which is active at relatively low temp., into the pipeline which is prefilled with water and then gradually introducing the initiator into the polymerisation system in 20 mins., using water. (I) is introduced into the polymerisation system at room temp.; (I) is metered into the water-filled pipeline and transferred to the polymerisation system with water; several types of initiators are fed into a single feedpipe for the system; after the initiator is added to the pipeline, a solvent is added which is soluble in both the initiator and in water, and which has only a slight effect on the polymerisation system, and the initiator is then transferred as above. The initiator is transferred to the system via a single pipe which is fitted with a nozzle for spraying water (pref. pure water at not above 30 deg.C) into the pipe in order to remove any blockages and lower the temp. inside the pipe. The process is applied to the suspension or emulsion polymerisation of vinyl chloride (VC), copolymerisation or graft copolymerisation of VC with comonomer(s), radical chain polymerisation of styrene, (meth)acrylic acid and esters thereof, and vinylidene chloride, and copolymerisation of these monomers with other comonomer(s). ADVANTAGE - The system is less expensive, w.r.t. equipment and energy costs for cooling, than prior-art double-tube system (esp. if several different initiators are added); only water is left in the feed pipe after the initiator is transferred, thus reducing the potential hazards (contrast prior-art systems). The initiator can be pumped into a closed reactor under pressure if required and the prod. is of better quality (fewer fish eyes, etc.).

Method of addition of polymerization initiator

A method of addition of polymerization initiator in the process of suspension polymerization or emulsion polymerization polymerizing a polymerizable monomer in aqueous medium, comprising introducing a low-temperature-active polymerization initiator taking part in the polymerization reaction to a piping system filled beforehand with water and successively adding said initiator in the piping system to polymerization system within 20 minutes using water.

Addition method of polymerization initiator

Process for producing acrylonitrile polymers

Acrylonitrile polymers of improved whiteness and thermal stability are provided by polymerizing acrylonitrile alone or with a comonomer in an aqueous medium, in the presence of a water-insoluble mercaptan, together with a redox catalyst comprising sulfurous acid or a salt thereof and nitrous acid or a salt thereof.

Process for producing acrylonitrile polymers

Acrylonitrile polymers of improved whiteness and thermal stability are provided by polymerizing acrylonitrile alone or with a comonomer in an aqueous medium, in the presence of a water-insoluble mercaptan, together with a redox catalyst comprising sulfurous acid or a salt thereof and nitrous acid or a salt thereof.

Procédé de polymérisation de l'acrylonitrile et polymères et tésultant

Verfahren zur herstellung von acrylonitrilpolymeren

Verfahren zur Herstellung von Acrylnitrilpolymeren von hervorragendem Weiß

PROCEDURE FOR POLYMERIZING ACRYLONITRILE

Verfahren zur herstellung von acrylonitrilpolymeren

Verfahren zur Herstellung von Acrylnitril-Polymerisaten und -Mischpolymerisaten

Procédé de préparation de polymères et copolymères de l'acrylonitrile sous forme granulaire, apte à la transformation en filés présentant une blancheur améliorée et de bonnes propriétés tinctoriales avec les colorants basiques, dispersés ou acides

Manufacture of acrylonitrile polymer solutions

Production of acrylonitrile polymer solutions

1287324 Acrylonitrile polymer solutions CELANESE CORP 3 June 1970 [16 June 1969] 26710/70 Heading C3P Acrylonitrile polymer solutions suitable for extrusion into shaped articles such as filaments are prepared by polymerizing acrylonitrile alone or together with one or more other ethylenically unsaturated monomers in an aqueous medium to cause precipitation of a polymer containing at least 40% by weight of acrylonitrile units and having an inherent viscosity of at least 0À5, recovering the polymer mixed with water amounting to 1-40% of the polymer weight, forming a mixture of the polymer and water with an alkyl cyanide having not more than 4 carbon atoms and, if desired, additional water, the mixture containing 20-70% by weight of polymer, and heating the mixture under superatmospheric pressure to above the boiling point (at atmospheric pressure) of the alkyl cyanide to form a homogeneous solution, the polymer remaining water-wet from its formation to its admixture with the alkyl cyanide. Suitable comonomers for the acrylonitrile include methyl acrylate or methacrylate, vinyl acetate,vinylidene chloride, methallyl alcohol, vinylidene cyanide, styrene, sodium methallyl-sulphonate and disodium allyl phosphate. Polymerization is preferably effected at an acid pH in the presence of a peroxy, azo or redox catalyst and, if desired, a mercaptan chain transfer agent. Polymerization may be operated continuously. Acetonitrile is the preferred alkyl cyanide.

Method for preparing polymers and copolymers of acrylic acid nitriles

Process for preparing polymers of acrylonitrile

Process for polymerizing acrylonitrile in the presence of sulfonic acids

Method of controlling the dyeability of acrylonitrile polymers

Verfahren zur Herstellung von Acrylnitrilhomo- oder -copolymerisaten

Polymerization of acrylic acid nitriles

Continuous process for the polymerization of acrylonitrile

Process for polymerizing acrylonitrile using

Process for preparing an aqueous dispersion of synthetic resin also containing a cellulose acetate alkylate

Process for preparing acrylonitrile polymers

Process for the preparation of uniform low molecular weight polyacrylonitriles

[UNK]

Verfahren zur Herstellung von Polymeren und Mischpolymeren des Acrylnitrils

Verfahren zum Polymerisieren von Acrylnitril und Verwendung der erhaltenen Polymere bzw. Copolymere zur Herstellung von geformten Artikeln

Process for polymerizing acrylonitrile

Shortstopping agents for vinyl polymerizations

Process for producing acrylonitrile polymer melt employing H2 O2 polymerization catalyst at a temperature of at least 80° C containing 3-80% water in the system

An improved process for producing an acrylonitrile melt by polymerizing acrylonitrile alone or a monomer mixture consisting of at least 75% of acrylonitrile and as the remainder at least one different ethylenically unsaturated compound in a system where water is present in an amount from 3 to 80% by weight based on the total amount of the monomer(s) and water, under a pressure above the self-generated pressure at a temperature above 80° C. The improvement is characterized by the use of hydrogen peroxide as the polymerization initiator.

Process for producing acrylonitrile polymer melt

Redox initiated polymerisation process

Vdf중합방법

개시된 내용은 VDF 중합방법에 관한 것이다. 하나 이상의 플루오르 함유 코모노머의 적은 양으로 선택적으로 변형되는 VDF의 중합방법은, 400과 3000사이로 구성된 평균분자량수를 가지며, 중성 말단 그룹을 가지는 (퍼)플루오르폴리에테르를 구성하는 미세이멀션의 존재에서 수행되며, 그리고 계면활성제는 염화된 산 말단 그룹(salified acid end groups)을 가진 퍼플루오르폴리에테르에 기초하며, 상기의 계면활성제는 400에서 600사이로 구성된 분자량수 Mn을 가지며, 그리고 평균 분자량 수가 700보다 더 큰 것을 가지는 분획이 존재하지 않거나 또는 5중량％보다 적은 양으로 존재하는 분자량의 분포를 가진다.

Process for preparing an aqueous dispersion of synthetic resin also containing a cellulose acetate alkylate

An aqueous dispersion of synthetic resin also containing a cellulose acetate alkylate is prepared by mixing water, a protective colloid and/or a surfactant, a cellulose acetate alkylate, an oil-soluble radical polymerization initiator and at least one monomer in which the cellulose acetate alkylate and the oil-soluble radical polymerization initiator are soluble, under stirring, to form an aqueous dispersion and then subjecting the monomer to radical polymerization to form a homogeneous mixture of the cellulose acetate alkylate and at least one polymer in the particles in the aqueous dispersion. The dispersion is suitable for the preparation of protective coatings.

Process for preparing an aqueous dispersion of synthetic resin mutually dissolved with a cellulose acetate alkylate

An aqueous dispersion of synthetic resin mutually dissolved with a cellulose acetate alkylate is prepared by mixing water, a protective colloid and/or a surfactant, a cellulose acetate alkylate, an oil-soluble radical polymerization initiator and at least one monomer in which the cellulose acetate alkylate and the oil-soluble radical polymerization initiator are soluble, under stirring, to form an aqueous dispersion and then subjecting the monomer to radical polymerization to form a homogeneous mixture of the cellulose acetate alkylate and at least one polymer in the particles in the aqueous dispersion.

Process for the production of polymers.

Coating and coating composition

Provided are improved coatings, polymeric dispersions, and polymeric composites, which include crosslinked polymeric nanoparticles (hereafter “PNPs”). Also provided are methods for forming improved coatings, polymeric dispersions, and polymeric composites, which include PNPs. The PNPs have polymerized units of at least one multi-ethylenically-unsaturated monomer have a mean diameter of from 1 to 50 nanometers. PNPs having polymerized units of at least one multi-ethylenically-unsaturated monomer and at least one surface-active monomer are also provided.

Polymerization process

PROCEDURE FOR THE POLYMERIZATION OF ETHYLENICALLY UNSATURATED MONOMERS.

Process for production of polyvinylidene fluorides

FIELD: polymer production. SUBSTANCE: invention relates to production of high-purity polyvinylidene fluorides, which can be used where demands for purity of utilized components (drugs, makeup preparations) are made. Polyvinylidene fluorides are prepared by polymerization of vinylidene fluoride with one or more fluorine-containing comonomers in presence of (i) microemulsion of (per)fluoropolyethers having neutral end groups or hydrogen-containing recurrent motifs, wherein said fluoropolyethers have average molecular weight from 400 to 3000, and (ii) surfactant based on perfluoroethers with end groups in the form of carboxylic acid salts. Polyvinylidene fluorides have molecular weight between 400 and 600 and molecular weight distribution such that fractions having molecular weight superior to 700 are absent or present in quantities below 5 wt %. Products show high white index at low level of impurities. EFFECT: improved quality of products. 12 cl, 3 tbl, 3 ex УУДУЗЬС ПЧ сэ РОССИЙСКОЕ АГЕНТСТВО ПО ПАТЕНТАМ И ТОВАРНЫМ ЗНАКАМ (19) (51) МПК? ВИ” 2184 744 ' 13) С2 С 08 Е 14/22, 2/24 12) ОПИСАНИЕ ИЗОБРЕТЕНИЯ К ПАТЕНТУ РОССИЙСКОЙ ФЕДЕРАЦИИ (21), (22) Заявка: 97111200/04, 01.07.1997 (24) Дата начала действия патента: 01.07.1997 (30) Приоритет: 01.07.1996 1Т М! 96 А 001342 (43) Дата публикации заявки: 21.06.1999 (46) Дата публикации: 10.07.2002 (56) Ссылки: ЕР 0655468 АЛ, 31.05.1995. $ 4864006 А, 05.09.1989. ЕР 0626396 АЛ, 30.11.1994. ЭНЦИКЛОПЕДИЯ ПОЛИМЕРОВ, Москва, Советская энциклопедия, 1972, том.1, с.394. (98) Адрес для переписки: 121087, Москва, а/я 33, Курышеву В.В. (71) Заявитель: АУСИМОНТ С.п.А. (1Т) (72) Изобретатель: БРИНАТИ Джиулио (1Т), ЛАЦЦАРИ Паоло (1Т), АРЧЕЛЛА Винченцо (1Т) (73) Патентообладатель: АУСИМОНТ С.п.А. (Т) (74) Патентный поверенный: Курышев Владимир Васильевич (54) СПОСОБ ПОЛУЧЕНИЯ ПОЛИВИНИЛИДЕНФТОРИДОВ (57) Изобретение относится к способу получения поливинилиденфторидов высокой чистоты, которые могут использоваться там, где предъявляются требования ...

VINYLIDENFLUORIDE (VDF) POLYMERIZATION PROCESS

Process for producing modified polytetrafluoroethylene

Fluorinated ionomer produced by aqueous polymerization using dispersed particulate of fluorinated ionomer

A process for making an aqueous dispersion of fluorinated ionomer particles by providing dispersed particulate of fluorinated ionomer in an aqueous polymerization medium and polymerizing at least one fluorinated monomer having an ionic group in the aqueous polymerization medium in the presence of the dispersed particulate of fluorinated ionomer and initiator to form the aqueous dispersion of particles of fluorinated ionomer.

Process for the production of a superabsorbent polymer

The present invention relates to a process for the production of a superabsorbent polymer comprising preparing an aqueous mixture of monomers selected to provide after polymerization a superabsorbent polymer; feeding said monomer mixture to a reactor; subjecting the aqueous monomer mixture in the reactor to free-radical polymerization to obtain a superabsorbent polymer gel; removing the superabsorbent polymer from the reactor; and working-up the superabsorbent polymer removed from the reactor to obtain a final product, whereby a basic aqueous medium comprising carbonate and/or hydrogen carbonate is fed to the superabsorbent polymer gel.

Process for the production of a superabsorbent polymer

The present invention relates to a process for the production of a superabsorbent polymer comprising preparing an aqueous mixture of monomers selected to provide after polymerization a superabsorbent polymer; feeding said monomer mixture to a reactor; subjecting the aqueous monomer mixture in the reactor to free-radical polymerization to obtain a superabsorbent polymer gel; removing the superabsorbent polymer gel from the reactor; and drying the superabsorbent polymer gel. Where at least one off-gas stream removed from any stage of the process is subjected to scrubbing with a basic aqueous solution prior to venting to obtain an aqueous scrubber solution that is at least partially recycled to any of the above steps of the process.

Continuous process for the production of a superabsorbent polymer

The present invention relates to a continuous process for the production of a superabsorbent polymer comprising providing an acidic liquid aqueous monomer mixture containing dissolved oxygen; continuously feeding the aqueous monomer mixture to a reactor; introducing a source of carbonate or hydrogen carbonate into the aqueous monomer mixture prior to entry into the reactor thereby forming a gas phase comprising carbon dioxide and at least a part of the dissolved oxygen, the gas phase being dispersed in the liquid phase; subjecting the gas/liquid mixture to at least partial phase separation immediately prior to or after entry into the reactor and at least partially removing the separated gaseous phase; subjecting the liquid phase in the reactor to free-radical polymerization to obtain the superabsorbent polymer, and continuously removing the superabsorbent polymer from the reactor.

Continuous process for the production of a superabsorbent polymer

The present invention relates to a continuous process for the production of a superabsorbent polymer comprising providing an acidic liquid aqueous monomer mixture containing dissolved oxygen; continuously feeding the aqueous monomer mixture to a reactor; introducing a source of carbonate or hydrogen carbonate into the aqueous monomer mixture prior to entry into the reactor thereby forming a gas phase comprising carbon dioxide and at least a part of the dissolved oxygen, the gas phase being dispersed in the liquid phase; subjecting the gas/liquid mixture to at least partial phase separation immediately prior to or after entry into the reactor and at least partially removing the separated gaseous phase; subjecting the liquid phase in the reactor to free-radical polymerization to obtain the superabsorbent polymer, and continuously removing the superabsorbent polymer from the reactor.

Method for producing an acrylamide-based cationic polymer reeling agent

내용 없음

PROCESS FOR POLYMERIZING ETHENICALLY UNSATURATED MONOMERS AND WATER-CONTAINING DISPERSION OF AN INITIATING AGENT.

Polymerization process of olefinic monomers

PROCESS FOR PREPARING HYDROPHILIC POLYMER GEL OF HIGH MOLECULAR WEIGHT

L'INVENTION CONCERNE UN PROCEDE POUR PREPARER UN GEL DE POLYMERE HYDROPHILE DE POIDS MOLECULAIRE ELEVE QUI CONSISTE A POLYMERISER LE OU LES MONOMERES DU POLYMERE DANS UN MILIEU AQUEUX AVEC UN SOLVANT ORGANIQUE COMPATIBLE ET UN COPOLYMERE VINYLIQUE COMPRENANT 5 A 95MOLES DE MOTIFS DE FORMULE: (CF DESSIN DANS BOPI) ET DE FACON CORRESPONDANTE 95 A 5MOLES DE MOTIFS DE FORMULE: (CF DESSIN DANS BOPI) OU R ET R REPRESENTENT INDEPENDAMMENT UN ATOME D'HYDROGENE OU UN RADICAL ALKYLE INFERIEUR, R REPRESENTE UN RADICAL ALKYLE COMPORTANT AU MOINS 8ATOMES DE CARBONE ET Y REPRESENTE UN RADICAL HYDROPHILE OU UN RADICAL QUATERNISABLE TEL QU'UN RADICAL PYRIDINO OU IMIDAZOLINO. THE INVENTION RELATES TO A PROCESS FOR PREPARING A GEL OF HYDROPHILIC POLYMER OF HIGH MOLECULAR WEIGHT WHICH CONSISTS OF POLYMERIZING THE MONOMER (S) OF THE POLYMER IN AN AQUEOUS MEDIUM WITH A COMPATIBLE ORGANIC SOLVENT AND A VINYL MEDIUM OF FORMULA 5 (95) CONTAINING: CF DRAWING IN BOPI) AND CORRESPONDINGLY 95 TO 5MOLES OF PATTERNS OF FORMULA: (CF DRAWING IN BOPI) OR R AND R INDEPENDENTLY REPRESENT A HYDROGEN ATOM OR A LOWER RADICAL ALKYL, R REPRESENTS A RADICAL ALKYL 8 COMPATOMORTANT CARBON AND REPRESENTS A HYDROPHILIC RADICAL OR A QUATERNIZABLE RADICAL SUCH AS A PYRIDINO OR IMIDAZOLINO RADICAL.

Process for the polymerization of monomers containing the vinyl group

Process for the production of acrylonitrile polymers

Improvements in polymerization processes

Improvements in suspension polymerization processes

Polymerisation of vinyl aromatic monomers - in aqs suspension

Polymerisation of a vinylaromatic monomer is effected in an aqs. suspension system comprising as first suspending agent a vinyl alcohol homopolymer or a copolymer comprising >=95 mol. % of polymerised vinyl alcohol, and as second suspending agent a comprising 75-91 mol. % of polymerised vinyl alcohol. The mixture of suspending agents leads to very good stability and control of the average size of beads produced. The aq. suspension pref. contains 0.03-0.5 wt. %. of first suspending agent and 0.002-0.05 wt. % of the second suspending agent. A surface active agent may be present. The vinyl aromatic monomer may be styrene or a halostyrene or alkylstyrene.

PROCESS FOR THE POLYMERIZATION OF ETHYLENICALLY UNSATURATED MONOMERS BY MEANS OF AQUEOUS DISPERSION INITIATORS, AND THESE DISPERSIONS

L'INVENTION EST RELATIVE A UN PROCEDE POUR LA POLYMERISATION DE MONOMERES ETHYLENIQUEMENT INSATURES DANS DES MILIEUX AQUEUX DANS LESQUELS ON EMPLOIE EN TANT QU'INITIATEUR UN COMPOSE SOLIDE, SOLUBLE DANS LES MONOMERES ET FORMATEUR DE RADICAUX LIBRES QUE L'ON AJOUTE AU MILIEU POLYMERISABLE SOUS LA FORME D'UNE DISPERSION AQUEUSE, CARACTERISE EN CE QUE LA DISPERSION DE L'INITIATEUR COMPREND UN MILIEU EMULSIFIANT CONSTITUE PAR A. UN EMULSIFIANT NON IONIQUE ETHOXYLE AYANT UN INDICE HLB SUPERIEUR A 15, CET EMULSIFIANT NE CONTENANT PAS DE LIAISONS ETHER CYCLIQUES INTERNES; ET B. UN EMULSIFIANT NON IONIQUE NON ETHOXYLE AYANT UN INDICE HLB INFERIEUR A 9, L'INDICE HLB COMPOSE DU MELANGE D'EMULSIFIANTS ETANT COMPRIS ENTRE 11 ET 17, ET EN CE QUE LA QUANTITE TOTALE DE L'EMULSIFIANT S'ELEVE A AU MOINS 1 EN POIDS, PAR RAPPORT A LA QUANTITE D'INITIATEUR. ELLE CONCERNE EGALEMENT LES DISPERSIONS AQUEUSES. THE INVENTION RELATES TO A PROCESS FOR THE POLYMERIZATION OF ETHYLENICALLY UNSATURE MONOMERS IN AQUEOUS MEDIA IN WHICH A SOLID COMPOUND, SOLUBLE IN MONOMERS AND A FORMER OF FREE RADICALS THAT ARE ADDED TO THE MEDIUM, AS THE INITIATOR, IS USED. THE FORM OF A WATER-BASED DISPERSION, CHARACTERIZED IN THAT THE INITIATOR'S DISPERSION INCLUDES AN EMULSIFYING MEDIUM CONSTITUTED BY A. A NON-IONIC ETHOXYL EMULSIFIER HAVING AN HLB INDEX GREATER THAN 15, THIS EMULSIFIER CONTAINING NO INTERNAL BINDINGS ETHER; AND B. A NON-IONIC NON-ETHOXYL EMULSIFIER HAVING AN HLB INDEX LESS THAN 9, THE HLB INDEX CONSISTS OF THE MIXTURE OF EMULSIFIERS BEING BETWEEN 11 AND 17, AND IN THAT THE TOTAL AMOUNT OF THE EMULSIFIER IS AT LESS 1 BY WEIGHT, IN RELATION TO THE INITIATOR QUANTITY. IT ALSO CONCERNS AQUEOUS DISPERSIONS.

Polymerization process

Polymerization of acrylonitrile

Improvements in the polymerization of organic compounds

PROCESS FOR THE PREPARATION OF A POLYMERIC FLOCCULATOR BASED ON POLYACRYLAMIDE

Process for the preparation of vinyl polymers, in particular acrylonitrile polymers suitable for the production of fibers

Patent FR2202901B3

Improvements in polymer preparation processes

Process for preparing acrylic polymers

PERFECTED PROCESS FOR PREPARING A LATEX

Process for the production of acrylonitrile polymers

Copolymerisation of vinyl chloride and acrylates

Acrylonitrile polymerization process

Polymerization process

Improved process for the preparation of polymers of the polyacrylonitrile type

Process for manufacturing a polyacrylonitrile solution

Acrylonitrile polymerization process

Improvements in pearl polymer preparation processes

Polymerization of ethylenic unsaturated monomer

METHOD FOR ADDING A POLYMERIZATION INITIATOR.

Polymerization process and products obtained by this process

PROCESS FOR THE POLYMERIZATION OF ETHYLENICALLY UNSATURATED MONOMERS USING AQUEOUS DISPERSION INITIATORS, AS WELL AS SUCH DISPERSIONS

Improvements in suspension polymerization

Aqueous dispersion of polymer

ABSTRACT AQUEOUS DISPERSION OF POLYMER This invention relates to aqueous dispersions of synthetic polymer particles, particularly those used as film-forming media in surface coating compositions. The problem of maintaining under moist conditions the adhesion to a substrate of a film formed from a surface coating composition having such an aqueous dispersion as a film former can be substantially overcome by using a dispersion wherein the film-forming polymer comprises (a) polar groups selected from amine, ureido and thioureido groups (b) a proportion of monomer units derived from acrylamide and meth-acrylamide, and (c) a proportion of poly(alkylene oxide). The proportions of these components present by weight of the film-forming polymer are at least 0.3% of (a), at least 0.3% of (b), at least 0.5% of (c) and from 1.4 - 9.0%/ of (a) + (b) + (c). These aqueous polymer dispersions may be used in interior or exterior surface coatings.

Sterically stabilised aqueous dispersion comprising at least 20 percent of polymer particles

Preparation of a modified polytetrafluoroethylene and use thereof

Polymersn. of vinyl(idene) monomers - using initiator emulsified in aqs. alcoholic soln. contg. PVA and emulsifier

Vinyl(idene) monomers are (co)polymsd. in aq. medium by addn. of free radical initiators in the form of an aq. alcoholic emulsion contg. PVA and polyoxyethylene-sorbitan monolaurate. This obviates the use of org. soln. of the initiator which is hazardous and makes drying of the polymer difficult. Decompsn. of the initiator at high temps. and press. is also avoided.

Polymerization process