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7868103 |
Method for producing polybutadiene
A method for producing a polybutadiene, which comprises subjecting 1,3-butadiene to cis-1,4 polymerization, and subsequently subjecting a resultant in the resulting polymerization system to...
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7332550 |
Stabilization of transition metal complexes for catalysis in diverse environments
This present invention is directed towards the identification or design, preparation, and use of suitable transition metal complexes for use as catalysts. The transition metal complexes may...
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6897272 |
α-olefins and olefin polymers and processes therefor
Disclosed herein are processes for polymerizing ethylene, acyclic olefins, and/or selected cyclic olefins, and optionally selected olefinic esters or carboxylic acids, and other monomers. The...
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6713557 |
Redox system and process
A process for preparing an aqueous emulsion polymer including providing at least one ethylenically unsaturated monomer and a free radical redox initiator system under emulsion polymerization...
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6368708 |
Polyolefin microspheres
Microspheres comprise a polymer or copolymer including one or more of 1) a plurality of C3 or larger alpha-olefin units wherein the polymer has an average number of branch points less than one per...
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6277933 |
Polyacrylonitrile particles by surfmer polymerization and sodium removal by chemical exchange
The present invention is an acrylic polymer particle which is consistently and substantially spherical in shape and which has a mean diameter that can be predetermined from about 30 microns in...
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6162881 |
Initiators for cationic polymerization
New initiators which are suitable for cationic polymerization have the following structure: ##STR1## such that following apply: R1 and R2 are alkyl or cycloalkyl or they, together with the S atom,...
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5986026 |
Syndiotactic 1,2-polybutadiene synthesis
Syndiotactic 1,2-polybutadiene is a thermoplastic resin which has double bonds attached in an alternating fashion to its polymeric backbone. Films, fibers and molded articles can be made utilizing...
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5942461 |
Polymerizable compositions comprising alpha-olefin hydrocarbon monomers and methods of use therefor
A polymerizable composition comprises an alpha-olefin hydrocarbon monomer, an effective amount of an organometallic catalyst of a Group VIII metal, preferably Ni or Pd, and at least one of water...
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5756619 |
Method for emulsion polymerization
The specification discloses an emulsifier for use in preparing olefinic polymers by emulsion polymerization which comprises a mixture of alkali metal salts of unsaturated branched chain isomers of...
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5756606 |
Means to control particle size and eliminate fouling in the synthesis of syndiotactic 1,2 - polybutadiene
Syndiotactic 1,2-polybutadiene is a thermoplastic resin which has double bonds attached in an alternating fashion to its polymeric backbone. Films, fibers and molded articles can be made utilizing...
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5684101 |
Free radical polymerisation process
Process for the free-radical polymerization of at least one olefinically unsaturated monomer, the polymerization being performed in the presence of a compound for effecting molecular weight...
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5677400 |
Process for producing syndiotactic-1,2-polybutadiene
In a process for producing syndiotactic-1,2-polybutadiene by suspension polymerization wherein a mixture composed of 1,3-butadiene, a cobalt compound, and an organometallic compound or metal...
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5616292 |
Process of making PAN fibers
A process for preparing PAN fibers under precipitation polymerization conditions in an aqueous solvent system.
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5556922 |
Dispersions for pressure sensitive adhesives containing alkyl (meth) acrylates
A method for preparing a dispersion for a pressure sensitive adhesive is provided, wherein the dispersions contain a copolymer (CP) having units of butyl acrylate and (meth)acrylic acid, the method...
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5468822 |
Polybutadiene composition and process for producing same
A 1,2-polybutadiene composition having an excellent reinforcing effect for rubber and synthetic resin materials including at least two polybutadiene components different in melting point from each...
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5405816 |
Syndiotactic 1,2-polybutadiene synthesis in an aqueous medium utilizing N,N-dibutyl formamide as a modifier
Pure syndiotactic 1,2-polybutadiene is a thermoplastic resin which has double bonds attached in an alternating fashion to its polymeric backbone. Films, fibers and molded articles can be made...
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5364581 |
Process of making polyacrylonitrile fibers
A process for the rapid precipitation polymerization of acrylonitrile and a minor amount of a vinyl carboxylic acid comonomer in an environment of less than 10 ppm metal-ions to produce an...
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5346971 |
Aqueous suspension polymerization of 1,3-butadiene to produce syndiotactic-1,2-polybutadiene
A process for producing polybutadiene essentially consisted of syndiotactic-1,2-polybutadiene in an aqueous medium includes a step off polymerizing diene essentially consisted of 1,3-butadiene in...
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5262171 |
Pharmaceutical tablet with PVP having enhanced drug dissolution rate
A pharmaceutical tablet is provided herein having an effective dissolution rate. The tablet contains a pharmaceutically-active ingredient and a substantially linear, i.e. non-crosslinked K-30 to...
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5011896 |
Syndiotactic 1,2-polybutadiene synthesis in an aqueous medium
Pure syndiotactic 1,2-polybutadiene is a thermoplastic resin which has double bonds attached in an alternating fashion to its polymeric backbone. Films, fibers and molded articles can be made...
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4839417 |
Method for making odorless aqueous solutions of water soluble polymers or copolymers
Water-soluble polymers or copolymers of acrylic and/or methacrylic acid which contain at least 50 base mole percent of these acids and as end groups hydrogen atoms, hydroxyl groups and moieties of...
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4742137 |
Polymer particles and process for producing the same
An aqueous dispersion of polymer particles each consisting essentially of (a) a syndiotactic 1,2-polybutadiene having 70% or more of unsaturated hydrocarbon groups in the side chains and having a...
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4521578 |
Composition and method of preparation of novel aqueous drilling fluid additives
The present invention relates to new compositions and methods of preparation of deflocculents for water-base mud additives. The disclosed materials are low molecular weight terpolymers and graft...
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4501867 |
Method for producing a polybutadiene material
A 1,2-polymerization of 1,3-butadiene is carried out in a polymerization solvent in the presence of a 1,2-polymerization catalyst consisting essentially of a cobalt compound soluble in the...
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4463144 |
Process for producing propylene-tetrafluoroethylene copolymer
A propylene-tetrafluoroethylene copolymer is produced by copolymerizing propylene and tetrafluoroethylene in a molar ratio ranging from 95/5 to 40/60 in an aqueous medium containing tertiary...
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4360632 |
Ketone bisulfites as reducing agent for free radical polymerization
This invention relates to an improvement in a process for producing a latex containing dispersed polymer. The improvement in the process for polymerizing a reaction mixture of vinyl monomer,...
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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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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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4255567 |
Process for producing NBR with octyl-to decyl sulfates
NBR containing at least 10% by weight of combined acrylonitrile is produced by polymerizing acrylonitrile and butadiene in emulsion in the presence of a linear alkyl sulfate mixture containing at...
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4205153 |
Diene interpolymers with halogenated monomers
An elastomeric interpolymer, method of preparation and blends thereof, where said interpolymer is comprised of (A) a conjugated diene, (B) a comonomer of selected esters and amides and (C)...
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4165333 |
Antioxidants
Antioxidants such as S-[3-(3,5-ditert.-butyl-4-hydroxyphenyl) propyl] thiomethacrylate are used to stabilize polymers either by being physically incorporated therein or by being polymerized in...
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4152293 |
Redox catalyst oxidant, catalyst and polymerization therewith
The invention relates to a method of preparing a composite suitable as an oxidizing component in a redox aqueous emulsion polymerization initiator starting with the relatively harsh oxidation of...
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4152294 |
Redox catalyst oxidant, preparation, catalyst and polymerization therewith
The invention relates to a method of preparing a composite suitable as an oxidizing component in a redox aqueous emulsion polymerization initiator starting with the relatively harsh oxidation of...
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4124752 |
Process for the preparation of SBR-rubbers employing bis(1-hydroperoxy cyclohexyl)peroxide
An improved process for the preparation of SBR rubber is disclosed wherein the emulsion polymerization of styrene and butadiene is conducted in the presence of a redox system comprising a standard...
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4107156 |
Process for preparing gel polymer of vinyl compound and gel polymer thereof
A gel polymer of vinyl compounds suitable for use as a coating is prepared by mixing the following four components [A], [B], [C] and [D], Component [A], an aqueous composition comprising an aqueous...
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4091197 |
Process for polymerization of vinyl chloride micro-suspension with metal compounds
Micro-suspension polymerization of vinyl chloride monomers and comonomers with a seed in the form of a previously prepared dispersion of the polymer or copolymer containing all of the...
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4052547 |
Process for polymerizing diolefin copolymers employing a catalyst mixture of hydroperoxides
A method of producing a polymeric material comprised of polymerizing at least one unsaturated organic compound in an aqueous emulsion in the presence of a free radical generating redox catalyst...
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4048147 |
Carboxylic acid of cyclopentadiene derivative, salt thereof, or ester thereof and process for producing these compositions
A novel compound represented by the formula, ##STR1## WHEREIN R is a hydrogen or an alkyl group having 1 to 3 carbon atoms, said four R's being the same or different; R1 is hydrogen, an alkali...
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3998998 |
Novel copolymers of dicyano-substituted 1,3-dienes
Novel copolymers are produced by polymerizing 2,3-dicyano-substituted 1,3-dienes with at least one monomer copolymerizable therewith selected from conjugated dienes and vinylaromatic compounds....
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3987018 |
Continuous process for the preparation of acrylonitrile polymers and copolymers
A continuous process for polymerizing acrylonitrile monomer or copolymerizing a mixture of acrylonitrile monomer and a further ethylenically unsaturated monomer copolymerizable therewith in an...
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3985718 |
Polymerization of olefinic monomers using a four component initiator
Four component polymerization initiators for olefinic monomers comprise (1) an oxidizing agent such as hydrogen peroxide, a persulphate, a permanganate, a chlorate, a perchlorate, a bichromate, a...
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3953402 |
Age resistant polymers of ditertiary alkyl-4-hydroxyaryl acrylate and dienes
Antioxidants such as 3,5-di tert.butyl-4-hydroxyphenyl acrylate and 3,5-di tert.butyl-4-hydroxyphenyl methacrylate, age resistant polymers having age resistors physically combined therewith and age...
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3928498 |
Preformed polymer latex in emulsion polymerization systems
Initial depletion of organosulfur molecular weight regulator during initial polymerization conversion in emulsion polymerization systems employing coagitated mixtures of emulsifiers and...
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3860568 |
NOVEL POLYMERIZATION INITIATOR AND PROCESS FOR POLYMERIZATION USING THE SAME
A process for the polymerization of an olefinic monomer by contacting the monomer with a polymerization initiator having an oxidizing agent, a chelating compound of the metal, in which the metal is...
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3855040 |
ANAEROBIC COMPOSITIONS
This invention concerns improved curable (polymerizable) anaerobic compositions which contain acrylate ester monomers, peroxy polymerization initiators, a strong acid, and an activator containing a...
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3846390 |
PROCESS FOR PRODUCING POLYVINYL CHLORIDE IN THE PRESENCE OF ALKYL THIOGLYCOLATE AS A CHAIN TRANSFER AGENT
When vinyl chloride or a monomeric mixture of vinyl chloride and an other ethylenically unsaturated monomer copolymerizable therewith is subjected to polymerization in the presence of a alkyl...
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3607878 |
METHOD OF POLYMERIZATION OF TETRAFLUORETHYLENE
An improved process for the production of aqueous colloidal dispersions of tetrafluoroethylene polymer wherein tetrafluoroethylene monomer is polymerized in the presence of water, a catalyst and a...
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3497482 |
POLYMERS OF QUATERNARY AMMONIUM COMPOUNDS
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3562240 |
POLYMERIZING CONJUGATE DIENES
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