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4472561 |
Process for the production of polymers and copolymers of vinyl chloride by suspension polymerization and their use as viscosity reducing agents in plastisol processing
Production of suspension polyvinyl chloride suitable for reducing the viscosity of polyvinyl chloride plastisols is effected by suspension polymerization in the presence of small amounts of (a)...
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4469839 |
Process for preparing an aqueous emulsion of a polymer by emulsion polymerization in the presence of an emulsifier
An emulsifier useful for preparing an aqueous emulsion having a high viscosity which comprises a copolymer of (1) at least one monomer selected from a vinyl ester, vinyl alcohol, an alkyl acrylate...
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4460753 |
Process for producing vinyl chloride polymers in a coated reactor and coating product therefor
A process for producing a vinyl chloride polymer which comprises polymerizing vinyl chloride monomer or a mixture of it with another monomer copolymerizable therewith in an aqueous medium or in...
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4459378 |
Monodisperse polymer particles and dispersions thereof
The invention provides monodisperse polymer particles and dispersions thereof, said particles having a diameter of preferably 5 μm or more. Such polymer dispersions are prepared by in a first step...
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4451625 |
Reduction of wall fouling in the suspension polymerization of vinyl chloride homopolymer
This invention relates to a method for reducing the amount of wall fouling in the suspension polymerization of vinyl chloride. The surfaces of the polymerization reactor are wetted with a solution...
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4439581 |
Method for the production of microcapsules
A hydrophobic liquid including a polyvalent isocyanate therein is dispersed in an aqueous medium in the presence of a specific polymer dissolved therein to form an emulsion system for producing...
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4439574 |
Process for the preparation of lattices of vinylacetate/olefin copolymers
Process for the preparation of latices of vinyl acetate/olefin copolymers. Vinyl acetate is copolymerized with at least one olefin and, if desired, at least one other copolymerizable monomer, in...
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4419245 |
Copolymer process and product therefrom consisting of crosslinked seed bead swollen by styrene monomer
A process for the manufacture of crosslinked ion exchange copolymer particles wherein small seed particles are swollen to final size by concurrently feeding monomer and polymerizing the same under...
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4399141 |
5-Alkyl or hydroxyalkyl substituted-10,11-dihydro-5H-dibenzo[a,d]cyclohepten-5,10-imines and anticonvulsant use thereof
5-Substituted-10,11-dihydro-5H-dibenzo[a,d]cyclohepten-5,10-
imines, derivatives and pharmaceutically acceptable salts thereof are useful as anticonvulsants.
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4385164 |
Block copolymer dispersion stabilizer and aqueous dispersion polymerization therewith
A block copolymer dispersion stabilizer for use in the aqueous dispersion polymerization of an ethylenically unsaturated monomer comprises at least two blocks linked by chemical valences. At least...
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4368307 |
Process for the production of vinyl chloride polymers
In a process for preparing a vinyl chloride resin by polymerizing vinyl chloride alone or with up to 20% by weight of other polymerizable unsaturated monomers, in an aqueous suspension, in the...
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4368287 |
Emulsifier and compositions comprising same
An acrylic resin emulsion which comprises an aqueous medium and particles of an acrylic resin emulsified and dispersed therein by the use of the emulsifier comprising as an essential component a...
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4367323 |
Production of hydrogels
The invention is to provide the methods for producing highly water-absorbable and water-retainable hydrogels having a large particle diameter together with a sufficient gel strength. The method is...
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4367320 |
Process for suspension polymerization of styrenic monomers
There is provided a method for the suspension polymerization of one or more styrenic monomers. This method involves increasing the amount of substantially water insoluble free radical initiator in...
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4367097 |
Method for manufacturing granular organic rubber chemical composition
This invention relates to a method for manufacturing a granular organic rubber composition which is useful for a vulcanizing agent, a vulcanization accelerator and antioxidant etc. by contacting an...
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4358546 |
Spherical porous cross-linked copolymers of chloromethylstyrene and divinylbenzene and the derivative thereof
A porous cross-linked copolymer of chloromethylstyrene and divinylbenzene having a divinylbenzene unit represented by Xm of from about 9.0 percent by mole to about 17.0 percent by mole based on the...
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4357449 |
Dispersion polymerization of cycloolefins
At least one cycloolefin monomer containing the norbornene group is polymerized by ring opening polymerization in a hydrocarbon diluent selected from C 4 to C 6 alkanes and isooctane that is a...
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4357269 |
Molding compound
A molding compound is disclosed comprising a diallyl phthalate compound and capsules of water.
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4352916 |
Use of hydrophobically modified water soluble polymers in suspension polymerization
Use of hydrophobically modified nonionic cellulose ethers or ethylene oxide copolymers leads to improved particle size and less latex formation in suspension polymerization processes. Cellulose...
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4345056 |
Process for suspension polymerization of vinyl chloride employing mixed protective colloids
An improvement in the process of producing polyvinyl chloride by the suspension process in the presence of protective colloids by utilizing a protective colloid mixture of from 20% to 80% of the...
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4334049 |
Process for the preparation of finely divided solid polymers in polyol
Finely-divided polymeric solids are prepared by free-radical polymerization on ethylenically unsaturated monomer or monomers in an organic solvent employing an alkylene oxide adduct of a...
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4331788 |
Process of polymerizing vinyl chloride in seeded microsuspension
A process for the preparation of homo- and co-polymers of vinyl chloride by polymerization in seeded microsuspension, which comprises effecting polymerization in the presence of one or more seeding...
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4330653 |
Process for the polymerization of vinyl chloride in an aqueous phase
A process for the polymerization of vinyl chloride in an aqueous phase in the presence of oil-soluble free-radical initiators and a mixture of at least two high-molecular, surface-active suspending...
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4328149 |
Polymerization method utilizing a three-phase emulsion system
Polymerization method utilizing a three-phase system: water-in-oil-in-water or oil-in-water-in-oil comprising the steps (a) adding the monomer material to be polymerized into the innermost water or...
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4309331 |
Surfactant-free acrylic plastisols and organosols compositions
Thermally coalescible acrylic resin dispersions comprising particles of single-phase, surfactant-free, random acrylic polymers or copolymers, containing at least 80% by weight of acrylic units,...
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4294740 |
Process for preparing acrylic resin emulsions
A process for preparing a substantially lump free acrylic resin emulsion by emulsion polymerization of one or more acrylic monomers in water in the presence or absence of an emulsifier or a...
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4290930 |
Aqueous vinyl plastics dispersion containing water soluble salt of polybasic phosphonic acid derivative
In the manufacture of plastics dispersions on the basis of vinyl polymers water-soluble salts of polybasic phosphonic acid derivatives, especially alkane-phosphonic acids and phosphonomethyl amines...
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4282340 |
Polymerization process for preparation of acrylamide homopolymers with redox catalyst
There is disclosed a process for the aqueous polymerization of acrylamide to produce polymers of high molecular weight utilizing mixtures of water and monomer, at least one of which can be...
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4271281 |
Process for preparing styrenic polymer particles
Styrenic polymer particles having a uniform particle size distribution are prepared without the formation of fine polymer powders. The suspension polymerization process which comprises providing a...
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4269959 |
Method of preparing improved imbibitive polymer
An improved imbibitive polymer is prepared by a method which comprises linearly polymerizing methyl acrylate with a free radical-yielding catalyst while the acrylate is suspended in an aqueous...
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4255545 |
Discrete bead polymer process
Discrete particles of sodium polyacrylate of high molecular weight and in which the majority of the particle size is in the range of not less than 0.5 mm. nor more than 1.0 mm. diameter are...
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4250289 |
Preparation of copolymers from maleic anhydride and alkenes
A process for the preparation of copolymers of maleic anhydride and relatively long-chain alkenes by suspension polymerization of these monomers in the presence of a free radical initiator and a...
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4247434 |
Process for preparation of large-particle-size monodisperse
Monodisperse latexes having a particle size in the range of 2 to 40 microns are prepared by seeded emulsion polymerization in microgravity. A reaction mixture containing smaller monodisperse latex...
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4241191 |
Manufacture of styrene suspension polymers
Styrene polymers are prepared by suspension polymerization using, as suspension stabilizers, mixtures of (A) a sparingly soluble inorganic metal compound and (B) a fine polymer dispersion....
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4238569 |
Preparation of hydrophilic material for gel chromatography
This invention relates to a method for preparing globular, hydrophilic copolymers which have reticulated internal structures and are suitable for gas and gel chromatography. The method comprises...
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4237255 |
Suspension stabilizer for p-methylstyrene suspension polymerization
In the aqueous suspension polymerization of p-methylstyrene, in which a difficultly soluble phosphate is used as a suspension stabilizer, the improvement which comprises adding to the aqueous...
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4229547 |
Method of preparing spherical porous bead-type polymers
This invention relates to a new and improved quiescent polymerization process which produces spherical beads of polymer having excellent porosity and unusually high bulk density. The process...
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4229336 |
Self cross-linking N-methylol functional emulsion polymers using polycarboxylic acid surfactant
This invention relates to self cross-linking aqueous emulsion coating compositions comprising water and an emulsion polymer emulsified therein, and methods for their production. The emulsion...
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4228264 |
Suspension polymerization of vinyl chloride using hydroxyacrylic polymers
A method of suspension polymerization is carried out by dispersing vinyl chloride in an aqueous medium in the presence of an oil soluble catalyst for polymerization and a polymerization improver...
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4212782 |
Polymers of acid addition salts of methacrylic acid and a 2-mono(lower)alkylaminoethyl methacrylate
Disclosed are solid, readily water-soluble addition polymers of acid addition salts of methacrylic acid and a 2-mono(lower)alkylaminoethyl methacrylate, whose lower alkyl group has up to 6 carbons...
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4189559 |
Manufacture of polymers in bead form from water-soluble, ethylenically unsaturated monomers
Production of polymers in bead form by forming a water-in-oil suspension of an aqueous solution containing at least one water-soluble ethylenically unsaturated monomer in an inert hydrophobic...
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4182810 |
Prevention of fouling in polymerization reactors
An olefin or mixture of olefins is polymerized in a hydrocarbon diluent in a turbulent reaction zone to produce particles of polymer which are substantially insoluble in the diluent (particle form...
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4180619 |
Crosslinked acrylic polymer microparticles
Crosslinked acrylic polymer microparticles having a particle size of from 0.1 to 10 microns are produced in relatively high concentrations by a method comprising the free radical addition...
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4174425 |
Process of preparing styrenic polymer foams
In a suspension polymerization process of preparing styrenic polymer particles from a styrenic monomer and small particles of a styrenic polymer in a definite particle size range, styrenic polymer...
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4166152 |
Tacky polymeric microspheres
Infusible, solvent-insoluble, solvent-dispersible, inherently tacky, elastomeric polymeric microspheres which are formed from non-ionic monomers and comprise at least one oleophilic...
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4164613 |
Manufacture of polymers in bead form from water-soluble, ethylenically unsaturated monomers
Production of polymers in bead form by forming a water-in-oil suspension of an aqueous solution containing at least one water-soluble ethylenically unsaturated monomer in an inert hydrophobic...
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4146588 |
Aerobic composition capable of polymerizing upon contact with oxygen
An aerobic composition which comprises (A), (B), (C), (D) and (E) and which begins to polymerize upon coming in contact with oxygen, wherein said components are; (A): at least one compound...
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4145499 |
Process for polymerizing vinyl chloride
Disclosed is a process for polymerizing vinyl chloride, alone or in combination with a comonomer, in the vapor phase maintained at a pressure lower than the vapor pressure of the monomer at the...
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4145494 |
Aqueous free radical emulsion polymerization
In the aqueous emulsion free radical polymerization of dienes and copolymerization of dienes and vinyl monomers using mercaptan modifiers there is added at at least 75% conversion a large amount of...
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4135043 |
Process for preparing polymers in powder form
Polymers in powder form are manufactured by polymerizing water-soluble ethylenically unsaturated monomers, which form hydrophilic polymers, in a powder bed of polymers of water-soluble...
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