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7396887 |
Insitu removal of chelator from anionic polymerization reactions
A process for producing polymers having at least one high vinyl end segment is provided. The process comprises: (a) forming a living prepolymer high vinyl initiator with a vinyl content greater...
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7351777 |
Retarded anionic polymerization of vinyl aromatic monomers using insoluble or heterogeneous retardants
This invention is a process to manufacture high quality vinyl aromatic polymer that is essentially free of unreacted vinyl aromatic monomer using retarded anionic polymerization wherein the...
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7288612 |
Initiator composition and method for anionic polymerisation
The invention relates to an initiator composition for anionic polymerization, comprising at least one alkali metal hydride selected from LiH, NaH, and KH, and at least one organylaluminum compound,...
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7285605 |
Batch process for synthesizing rubbery polymers having a high trans microstructure content
The present invention is directed to a batch process for synthesizing rubbery polymers, such as styrene-butadiene rubber, having a high trans microstructure. In one embodiment, the batch process...
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7205360 |
Preparation process for block copolymers for tire tread compositions, and such copolymers
A preparation process for a copolymer having two blocks usable in a sulphur-cross-linkable rubber composition of reduced hysteresis in the cross-linked state, such a block copolymer in which one of...
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7189792 |
Catalyst for synthesizing high trans polymers
The process and catalyst of this invention can be utilized to synthesize homo and copolymers of conjugated diene monomers and vinyl aromatic monomers having high trans contents of greater than 60%...
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7125940 |
Conjugated diene polymers and copolymer blocks and process for preparing same
Disclosed is a process for preparing polymers and copolymer blocks of conjugated dienes with varying amounts of branching comprising the use of a microstructure control agent and a microstructure...
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7101941 |
Method for anionic polymerization of α-methylstyrene
Process for preparing homopolymers of α-methylstyrene, or copolymers of α-methylstyrene and comonomers, by anionic polymerization in the presence of an initiator composition, which comprises...
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7048023 |
Pneumatic tire having a component containing high trans styrene-butadiene rubber
The invention is directed to a pneumatic tire having at least one component comprising a vulcanizable rubber composition, wherein the vulcanizable rubber composition comprises, based on 100 parts...
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6878789 |
Preparation process of acrylic acid ester polymer
A process for the preparation of an acrylic acid ester polymer, includes carrying out polymerization of an acrylic acid ester or block copolymerization of an acrylic acid ester and another...
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6831144 |
Anionic polymerization process, and process for producing a polymer by the anionic polymerization process
In anionic polymerization using an anionic polymerization initiator, a tertiary organoaluminum compound (A) having in the molecule thereof a chemical structure represented by a general formula:...
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6800582 |
Process of preparation of amino functionalized diene polymers, polymers of such type, rubber composition and tire casing containing those polymers
The present invention provides a process for preparing amino functionalized diene polymers with 1,4-trans linkage content equal to or greater than 70%. The invention also concerns polymers of such...
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6777511 |
Process for producing poly (meth) acrylates having reduced metal content
An industrially excellent process for producing a poly(meth)acrylate having a reduced metal content which comprises contacting a mixture of a poly(meth)acrylate and an organic solvent with an...
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6767976 |
Process for polymerizing a methacrylic ester or an acrylic ester
(1) A methacrylic ester or an acrylic ester is anionically polymerized, using a polymerization initiator compound comprising an addition reaction product of a conjugated diene compound and an...
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6758251 |
Pneumatic tire having a component containing high trans styrene-butadiene rubber
The invention is directed to a pneumatic tire having at least one component comprising a vulcanizable rubber composition, wherein the vulcanizable rubber composition comprises, based on 100 parts...
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6686423 |
Method for carrying out the anionic polymerization of vinylaromatic monomers
In a process for the anionic polymerization of vinylaromatic monomers or dienes in the presence of a lithium organyl or lithium alcoholate and a magnesium and/or an aluminum compound, a sterically...
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6670435 |
Process for synthesizing trans-1,4-polybutadiene
The process and catalyst system of this invention can be utilized to synthesize polybutadiene rubber having a high trans content and a low melting point by solution polymerization. The...
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6646075 |
High molecular weight perfluorocyclobutane polymers and method of making
This invention relates to high molecular weight perfluorocyclobutane polymers and methods of polymerizing trifluorovinyl monomers to form high molecular weight perfluorocyclobutane polymers in the...
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6627715 |
Group IIa metal containing catalyst system
The group IIa metal containing catalyst system of this invention can be utilized to synthesize rubbery polymers having a high trans microstructure by solution polymerization. Such rubbery polymers...
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6608154 |
Process for synthesizing trans polydiene rubber
The process and catalyst system of this invention can be utilized to synthesize polybutadiene rubber having a high trans content and a low melting point by solution polymerization. The...
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6534608 |
Support materials for use with polymerization catalysts
The invention provides new olefin(s) polymerization catalyst systems, including graphite support. The invention also provides methods of preparing the catalyst system, and to the catalyst system's...
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6506862 |
Process for the preparation of a diene elastomer by anionic polymerization
The present invention provides a process for the preparation of a diene elastomer having a reduced amount of vinyl linkages, by anionic polymerization of one or more monomers comprising at least...
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6476133 |
Method for producing a solution of diene polymers in vinyl aromatic compounds and method for producing resistant vinyl aromatic polymers by polymerizing the same solution
A process for preparing a solution of high molecular weight polymers of conjugated dienes in a vinylaromatic hydrocarbon by anionic polymerization of the diene in the presence of an alkyllithium as...
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6455651 |
Uniform initiation of anionic polymerization using organo-substituted alkali metal initiators
The present invention is an improvement in a method of anionically polymerizing monomers by contacting them with an anionic polymerization initiator which is an organo-substituted alkali metal...
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6444767 |
Method for retarded anionic polymerization
In a process for the homopolymerization of vinylaromatic monomers or the copolymerization of vinylaromatic monomers and dienes, the monomers are polymerized in the presence of at least one alkali...
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6388032 |
Cyclic olefin polymer containing little catalyst residue
A cyclic olefin polymer having a small content of a catalyst residue, a production process for the same and use of the same as an optical material. Catalysts used for polymerization and/or...
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6353056 |
Method for the production of block copolymers by retarded anionic polymerization
In a process for the preparation of block copolymers from vinylaromatic monomers and dienes, the monomers are polymerized in the presence of at least one alkali metal organyl or alkali metal...
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6303721 |
Process for producing diene polymer solutions in vinyl aromatic monomers
The anionic polymerization of dienes or copolymers of dienes and vinylaromatic monomers in a vinylaromatic monomer or monomer mixture to give homopolydienes or copolymers or mixed homopolydienes...
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6300441 |
Method for the production of an initiator composition for retarded anionic polymerization
Disclosed are a process for the preparation of an initiator composition comprising an alkali metal organyl and an aluminum organyl and a process for the polymerization of anionically polymerizable...
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6284905 |
Bridged metal complexes
A Group 4 transition metal complex containing a boron or aluminum bridging group containing a nitrogen containing electron donating group, especially an amido group.
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6271324 |
Method for preparing polyacryl(meth)acrylates
Homopolymers, copolymers or block copolymers are prepared by anionic polymerization of acrylates and/or methacrylates in the presence of an initiator composition containing A) an organic alkali...
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6214951 |
Cycloolefin copolymers having high tear strength and low optical attenuation
Thermoplastic cycloolefin copolymers (COCs) having high tear strength and low optical attenuation, a process for their preparation, and their use as optical waveguides (optical fibers).
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6150487 |
Multifunctional organic alkali metal initiator and its synthesis, anionic polymerized star polymers and their preparation
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6103846 |
Process for making anionic polymeric di-and polyfunctional polymers using protected functional initiators
The preparation of di- or polyfunctional polymers by anionic polymerization using functionalized initiators having the structure R 1 R 2 R 3 Si--A--B, wherein each R is methyl and A is a...
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5830961 |
Preparation of polyacrylates
Polyacrylates based on alkyl acrylates or alkyl alkylacrylates or mixtures thereof as monomers are prepared in the presence of an initiator composition containing an alkali metal ester enolate and...
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5753579 |
Trans microstructure directing initiator system
The process of this invention can be utilized to synthesize polymers having a high trans microstructure. The polymers which can be prepared utilizing the procedure of this invention include high...
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5741869 |
Addition polymers derived from norbornene-functional monomers and process therefor
Addition polymers derived from norbornene-functional monomers are terminated with an olefinic moiety derived from a chain transfer agent selected from a compound having a terminal olefinic double...
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5670592 |
System for priming the anionic polymerization of alkyl methacrylate
The invention concerns the anionic polymerization of alkyl methacrylate in the presence of a priming system. The priming system comprises an organolithium primer and an organic compound of aluminum...
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5508363 |
Preparation process of organosilicon compounds and production of silicon carbide
Disclosed herein are a novel process for the preparation of alkylsilanes and alkenyl silanes by hydrosilylation of their corresponding silanes and unsaturated hydrocarbons in the presence or...
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5468819 |
Process for making polymers containing a norbornene repeating unit by addition polymerization using an organo (nickel or palladium) complex
A single component ionic catalyst consists essentially of an organonickel complex cation, and a weakly coordinating neutral counteranion. The cation is a neutral bidentate ligand removably attached...
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5248737 |
Method of making amine/propylene copolymers
Mono and diallyl amines are silylated to protect them from reacting with high activity Ziegler-Natta catalysts so they may be copolymerized with propylene; also disclosed are copolymers of such...
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5216181 |
Liquid telechelic polymers having high 1,4-diene structure
Liquid telechelic polymers are made from dienes and are produced via anionic polymerization. While having low molecular weight, for example less than 15,000, the telechelic polymers are generally...
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5180799 |
Process for polymerizing methacrylic acid ester monomers
A process for addition polymerization of vinylic (in particular methacrylic) monomers at a temperature in the range of -20° to 60° c., in the presence of a catalyst comprising: (a) a first...
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5162476 |
Stereoregular acrylonitrile polymer and composition comprising same
Disclosed is a linear acrylonitrile polymer having a viscosity average molecular weight of at least 50,000, which has a stereoregularity such that the polymer satisfies requirements of I>0.4 and...
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5086136 |
Process for producing high trans low vinyl conjugated diene (co)polymer
A process for producing a high trans low vinyl conjugated diene (co)polymer, comprising polymerizing at least one conjugated diene alone or in combination with at least one alkenyl compound using a...
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5063190 |
Anionic initiator system for polymerizing monomers
Liquid telechelic polymers are made from dienes and are produced via anionic polymerization. While having low molecular weight, for example less than 15,000, the telechelic polymers are generally...
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4933401 |
Catalyst composition for polymerization of conjugated diene and process for producing conjugated diene polymer
A catalyst composition for polymerizing a conjugated diene which comprises the following (a), (b) and (c) components: (a) an organolithium-aluminum compound represented by the formula: LiAlR 1...
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4889900 |
Preparation of alkyl methacrylate monomers for anionic polymerization
A process is disclosed for treatment of alkyl methacrylate monomers for subsequent polymerization by an anionic initiator to produce a polymer with a molecular weight distribution between about...
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4591624 |
Catalyst system and process for polymerizing conjugated dienes
Conjugated dienes, in particular 1,3-conjugated dienes, can be polymerized or copolymerized using the catalyst system of this invention to polymers wherein the amount of 1,2-structure contained in...
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4554334 |
Process for preparing optically active polymer
An optically active polymer is obtained by polymerizing a vinyl monomer in the presence of a catalyst which comprises an asymmetric ligand compound of the formula (I) or (II): ##STR1## in which R 1...
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