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4033900 |
Composition useful in anionic polymerization
This invention relates to the preparation of solution polymers and rubbers from vinyl monomers using a new catalyst complex of a barium di-tert-alkoxide-hydroxide salt and ann organic lithium...
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4020251 |
1,3-Cyclodiene-acyclic conjugated diene copolymers
A copolymer is produced by polymerization of a mixture comprising a 1,3-cyclodiene and an acyclic conjugated diene wherein a substantial percentage by weight of the acyclic conjugated diene units...
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4016347 |
Process for the production of polymers having a broad molecular weight distribution
1,3-Butadiene is polymerized to polymers having broad molecular weight distribution in a continuous-adiabatic organolithium catalyzed polymerization in a flow pipe reactor by varying in a periodic...
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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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3980625 |
Method for producing novel rubbery polymers from diene monomers
Novel rubbery polymer having a uniform and broad molecular weight distribution, a ratio of weight average molecular weight to number average molecular weight of 3 or more, a content of monovinyl...
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3980624 |
Process for producing rubbery polymers and copolymers having branched structures
A polymerization process for producing rubbery polymers or random copolymers having excellent physical properties as well as good processability, and completely freed from a flow at normal...
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3972963 |
Organic reinforcing fillers for rubber
Organic reinforcing fillers for rubber are prepared by the anionic initiated slurry polymerization of styrene and divinylbenzene in the presence of a block polymer dispersant. The polymerization...
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3962169 |
Fluoroelastomer latex containing lithium ion and a creaming agent and process for preparation thereof
A fluoroelastomer latex which remains useful after being stored for a long period of time and which can be produced by a process employing a relatively brief residence time in the reactor can be...
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3957914 |
Cyclic polymerization process
A cyclic process is provided for the polymerization and hydrogenation of certain polymers wherein the monomer is anionically polymerized in solution, the living polymers then being terminated by...
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3953543 |
Polymerization process and polymer produced thereby
The process disclosed herein involves the preparation of butadiene-styrene copolymers of improved green strength and low running temperature when used in tire compositions, which comprises the...
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3948843 |
Additives for oils
Additives for oils prepared by polymerizing by an anionic process at least one vinyl aromatic compound and at least one conjugated diene in the presence of a solvent, followed by hydrogenation of...
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3949020 |
Thermoplastic block polymers
A method of preparation and the composition of thermoplastic block polymers wherein divinylbenzene is added with the diolefin monomer to a polystyryllithium initiator to prepare a unique block...
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3937681 |
Tire tread of homopolymers of butadiene
For facilitating the production of automotive tire treads of satisfactory abrasion and skid resistance, there is provided a composition consisting essentially of: A. a polybutadiene containing...
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3931107 |
Polyalkoxy monovinylaromatic compound in copolymerization of a conjugated diene with a monovinyl-substituted aromatic compound
Polyalkoxy monovinyl substituted aromatic compounds, such as 3,4-dimethoxystyrene, function as both comonomer and randomizing agent in organolithium initiated copolymerization of a conjugated diene...
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3929914 |
Process for preparing a polycarboxydiene polymer
A polycarboxydiene polymer is prepared by reacting a saturated polycarboxylic acid, anhydride, ester or acid halide with a polyhydroxydiene polymer having pendant and terminal hydroxy groups...
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3928302 |
Alkaline earth metal organometallic compounds, their preparation by metallation and catalysts comprising same
Organometallic compounds of high carbanion yield are parpared by metallation with barium, strontium or calcium or mixture of the same of certain acidic organic compounds having a pKa value of...
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3898302 |
Process for producing block copolymer
A self-curing block copolymer, which has improved elastomeric properties without being subjected to any special chemical or physical treatment, is obtained by a single-stage process which comprises...
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3890278 |
Anionic polymerization
A novel process for polymerization or copolymerization of monomers is described, according to which the reaction is carried out in the presence of an anionic initiator and a macroheterocyclic...
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3887535 |
Process for producing rubbery conjugated diolefin polymers having branched structures
A unique polymerization process for producing rubbery polymers having excellent physical properties and processability and freed from a cold flow property at normal temperature. The process, which...
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3886089 |
Dilithio alkane catalyst compositions and method for the preparation thereof
Novel dilithioalkane catalyst compositions for use as polymerization initiators are prepared by simultaneously reacting an alkyl monohalide and a hydrocarbyl dihalide with powdered lithium metal in...
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3886130 |
Catalyzed production of heat stable fiber-forming vinyl chloride
Method for the polymerization of vinyl chloride which is catalyzed by a lithium complex prepared by reacting alkyllithium with an organocompound of a metal(s) of Group IV or with an alkoxide of a...
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3884889 |
Cyclic triene coupling agents
Cyclic trienes are utilized as coupling agents for polymers which are prepared employing an organolithium initiator.
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3879366 |
Modification of polymer-lithium coupled with polyhalides
In the preparation of conjugated diene polymers with multilithium initiators followed by termination with polyfunctional reagents, broader molecular weight distribution is obtained by modifying the...
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3875131 |
Process for producing heat-stable polyvinyl chloride
Polymerization of vinyl chloride in the presence of highly pure tert-butyl-lithium catalyst to produce heat-stable polyvinyl chloride. The reaction is carried out at temperatures maintained in the...
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3872068 |
PROCESS FOR PREPARING BLOCK COPOLYMER RESIN
An impact resistant block copolymer prepared by polymerizing a mixture of a vinyl substituted aromatic hydrocarbon and a conjugated diene in a non-polar solvent wherein said polymerization is...
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3862098 |
ALPHA-OLEFIN TERMINATED POLYSTYRENE MACROMOLECULAR MONOMERS HAVING A SUBSTANTIALLY UNIFORM MOLECULAR WEIGHT DISTRIBUTION
This application discloses a copolymerizable macromolecular monomer having a substantially uniform molecular weight distribution such that its ratio of Mw/Mn is not substantially above about 1.1,...
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3862097 |
PROCESS FOR PREPARING COPOLYMERIZABLE MACROMOLECULAR MONOMERS HAVING A SUBSTANTIALLY UNIFORM MOLECULAR WEIGHT DISTRIBUTION
This application discloses a process for preparing a copolymerizable macromolecular monomer comprising (a) polymerizing a vinyl-containing compound in the presence of an alkali metal hydrocarbyl...
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3862251 |
ORGANO-DILITHIUM INITIATOR FOR ANIONIC POLYMERIZATION, A NOVEL POLYISOPRENE, AND PROCESSES FOR PRODUCTION THEREOF
An anionic polymerization process utilizing a novel organodilithium polymzation initiator, such as the addition product of sec-butyllithium and m-divinylbenzene, which is especially applicable for...
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3846393 |
GLYCOL TERMINATED MACROMOLELCULAR MONOMERS HAVING A SUBSTANTIALLY UNIFORM MOLECULAR WEIGHT DISTRIBUTION
This application discloses a copolymerizable macromolecular monomer having a substantially uniform molecular weight distribution such that its ratio of Mw/Mn is not substantially about about 1.1,...
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3846360 |
BASE FOR UNIVERSAL PIGMENT CONCENTRATES
Color concentrates wherein the carrier material comprises at least a minor amount of certain solution-polymerized hydrocarbons exhibit compatibility in a wide range of plastic materials.
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3842059 |
ACRYLATE AND METHACRYLATE TERMINATED POLYSTYRENE MACROMOLECULAR MONOMERS HAVING A SUBSTANTIALLY UNIFORM MOLECULAR WEIGHT DISTRIBUTION
This application discloses a copolymerizable macromolecular monomer having a substantially uniform molecular weight distribution such that its ratio of Mw/Mn is not substantially above about 1.1,...
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3817955 |
PREPARATION OF POLYMERS USING COMPLEXES OF ORGANOMAGNESIUMS WITH CERTAIN HYDRIDES AS CATALYSTS
Preparation of polymers of conjugated dienes, such as those of 1,3-butadiene; utilizing, as a catalyst, complexes or organomagnesiums with (i) alkali metal hydrides or (ii) tetraalkylammonium...
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3789090 |
PROCESS FOR THE PRODUCTION OF CONJUGATED DIENE LIQUID POLYMERS
A process is disclosed for the production of liquid polymers by polymerizing conjugated diolefins or copolymerizing these diolefins with vinyl compounds in the presence of particularly organosodium...
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3737421 |
PROCESS OF JOINING BY MEANS OF POLYHALOGEN COMPOUNDS
Molecules of low molecular weight polymers derived at least in part from a diene monomer, are joined to produce branched polymers and copolymers of increased molecular weight. The polymers which...
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3725505 |
PYRENE CONTAINING POLYMERS PREPARED BY ANIONIC POLYMERIZATION
An anionic polymerization process for forming homopolymers of vinylpyrene and block copolymers containing at least one polyvinylpyrene segment is disclosed. Block copolymers having novel structures...
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3725506 |
MANUFACTURE OF COPOLYMERS OF STYRENE AND α-METHYLSTYRENE
Continuous process for the manufacture of copolymers of styrene and α-methylstyrene having a substantially statistical distribution of the monomers by anionic polymerization at low temperatures...
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3725488 |
MULTILITHIUM POLYMERIZATION INITIATORS
Multilithium polymerization initiators are prepared by the metalation of multimethyl-substituted aromatic hydrocarbons with tertiary or secondary alkyl or cycloalkyllithium compounds in hydrocarbon...
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3723575 |
METHOD OF PRODUCING GRAFT POLYMERS
Graft polymers are produced by polymerizing a first monomer charge at a relatively low temperature, heat-treating the polymer, and charging additional monomer. The first monomer charge contains at...
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3718703 |
BISORGANOALKALINE EARTH METAL COMPOUNDS AND A METHOD OF PREPARING SAME FROM BISORGANOMERCURIALS
Novel bisorganoalkaline earth metal compounds are prepared by reacting bisorganomercurials with calcium, strontium or barium. The novel process is conducted in a solvent. As an example,...
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3718702 |
PROCESS FOR PRODUCING DILITHIO HYDROCARBONS
Dilithio hydrocarbons are produced by heating allyllithium or a hydrocarbon-substituted allyllithium for 20-200 hours at 50°-150° C. Substituted allyllithiums can have alkyl groups or aryl...
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3716495 |
POLYMERIZATION INITIATOR COMPOSITION AND USE THEREOF
An initiator composition, formed by mixing: (a) an organolithium compound and (b) a hydrocarbyl metal compound wherein the metal is selected from Group 2a, 2b, or 3a of the Periodic Table, is...
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3694516 |
PREPARATION OF HYDROCARBON SOLVENT SOLUTIONS OF ORGANOLITHIUM COMPOUNDS
Method of preparing hydrocarbon solvent solutions of organolithium compounds in which solutions such as benzene or heptane solutions of di- and poly-lithio adducts of polyisoprenes or...
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3691241 |
PREPARATION OF POLYMERS AND TELOMERS USING COMPLEXES OF ORGANOMAGNESIUMS WITH CERTAIN HYDRIDES AS CATALYSTS
Preparation of polymers of conjugated dienes, such as those of 1,3-butadiene; and of telomers, such as those of benzene or toluene with 1,3-butadiene; utilizing, as a catalyst, complexes of...
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3687913 |
CONTINUOUS PROCESS FOR THE PREPARATION OF LIVING POLYMER
Conjugated diolefin polymer having a narrow molecular weight distribution and a well coincident value of an average molecular weight with the expected value calculated from a molar ratio of monomer...
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3684780 |
POLYMERIZATION PROCESS USING MULTIFUNCTIONAL POLYMERIZATION IMITATORS
Sec- or tert-organomonolithium compounds are reacted with 1,3-butadiene in the absence of added polar material to produce a multifunctional polymerization initiator effective for the polymerization...
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3679776 |
POLYMERIZATION OF HYDROCARBON DIENES WITH LITHIUM-SODIUM ALLOYS
Conjugated hydrocarbon dienes are polymerized with lithium-sodium alloy initiator containing 0.1 to 90 mole percent sodium in a nonpolar medium at about -10°C. to 100°C. to yield the...
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3674895 |
POLYMERIZATION OF 1-OLEFINS WITH MULTIFUNCTIONAL INITIATOR SYSTEMS
1-Olefins are efficiently polymerized with an initiator system formed from an organomonolithium compound, a polyvinyl aromatic compound, an N,N,N',N'-hydrocarbyl-substituted ethylenediamine...
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3669943 |
PROCESS FOR PRODUCING CONJUGATED DIOLEFIN POLYMER WITH REDUCED COLD FLOW
A process for producing a homopolymer or copolymer of a conjugated diolefin by polymerizing a conjugated diolefin alone or copolymerizing a conjugated diolefin with a vinyl aromatic hydrocarbon in...
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3668263 |
ORGANOLITHIUM POLYMERIZATION INITIATORS AND USE THEREOF IN POLYMERIZATION PROCESSES
Polymerization initiator compositions comprising reaction products of C 2 -C 12 alkyllithiums with monomers from the group of polymerizable conjugated dienes and polymerizable vinyl-substituted...
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3668279 |
PROCESS FOR COUPLING LIVING LITHIOPOLYMERS
Living monolithio polymers are coupled by the action of certain novel coupling agents (e.g., nitrobenzene, sulfur, dimethyl terephthalate, acrylonitrile, maleic anhydride). For example, styrene is...
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