Matches 51 - 100 out of 212 < 1 2 3 4 5 >
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5654371 Anionic polymerization process using functionalized initiators  
A process for the preparation of hydrocarbon solutions of monofunctional ether initiators of the following general structure: M--Q n --Z--OA(R 1 R 2 R 3 ) (II) wherein M is...
5654384 Process for preparing high vinyl polbutadiene rubber  
This invention reveals a process for preparing high vinyl polybutadiene rubber which comprises polymerizing 1,3-butadiene monomer with a lithium initiator at a temperature which is within the range...
5629256 Catalyst system for the synthesis of rubbery polymers  
The subject invention relates to an anionic polymerization technique for synthesizing rubbery polymers of conjugated diolefin monomers, such as rubbery copolymer of α-methylstyrene and...
5623035 Process for the synthesis of rubbery polymers  
The subject invention relates to an anionic polymerization technique for synthesizing rubbery polymers of conjugated diolefin monomers, such as a rubbery copolymer of α-methylstyrene and...
5621149 Process for preparing functionalized initiators for anionic polymerization  
A process for the preparation of hydrocarbon solutions of monofunctional ether initiators of the following general structure: M--Z--O--C(R 1 R 2 R 3 ) wherein M is an alkali metal; Z is a...
5620939 Initiative system  
This invention reveals an initiator system which is comprised of (a) a lithium initiator, (b) a sodium alkoxide, and (c) a polar modifier; wherein the molar ratio of the sodium alkoxide to the...
5612435 Terminally functionalized polymers produced using protected functional initiators  
The anionic polymerization of unsaturated monomers with functionalized initiators having the structure R 1 R 2 R 3 Si--O--A'--Li is improved by selecting A' from the structures --CH 2 --CH 2 ...
5605991 Multifunctional initiator from divinyl dislane  
A multifunctional initiator is prepared by contacting an organo-alkali metal compound with a silane represented by the formula: ##STR1## wherein the R' are generally lower alkyl groups such as...
5563275 Anionic polymerization processes  
Disclosed herein is a process for anionic polymerization of selected methacrylate monomers at elevated (as high as about 100° C.) temperatures, while maintaining good "living" characteristics, by...
5550200 Method of producing conjugated diene-aromatic vinyl hydrocarbon copolymers  
A rubber composition, having good breaking properties, high tanδ, good wear resistance and a method for preparing a copolymer used in the rubber composition. The copolymer is a butadiene-styrene...
5527860 Process for producing a diolefin polymer or copolymer and a rubber composition containing such a diolefin polymer or copolymer  
A process for producing a diolefin polymer or copolymer, comprising the steps of polymerizing 55-100 wt % of a conjugated diolefin with 0-45 wt % of an aromatic vinyl compound as monomers in a...
5521255 Synthesis of silyl-functional telechelic hydrocarbon polymers  
A method for preparing a telechelic polydiene having at least 70% 1,4-microstructure and at least 70% of its end groups capped by reactive silyl functionality is disclosed, said method comprising: ...
5470929 Process for synthesizing styrene-isoprene rubber  
The subject invention relates to a technique for synthesizing rubbery copolymers of styrene and isoprene. These rubbery copolymers exhibit an excellent combination of properties for utilization in...
5448003 Synthesis of rubbery polymer using anionic polymerization modifier  
It has been unexpectedly discovered that various compounds, such as alkyl tetrahydrofurfuryl ethers, can be used to modify anionic polymerizations of conjugated diene monomers. These modifiers can...
5416157 Process for improving mechanical shear stability of acrylic enteric polymers  
Provided is a process useful for making acrylic polymers of methacrylic acid having improved shear stability. The process provides polymers useful as enteric coatings for medicaments having...
5385994 2,5-substituted tetrahydrofurans as anionic initiator modifiers  
A method for improving the initiation efficiency during the anionic polymerization of 15 to 100 percent weight of a vinyl aromatic hydrocarbon monomers and 0 to 85 percent by weight of a conjugated...
5359016 Process for the synthesis of styrene-isoprene rubber  
The subject invention relates to a technique for synthesizing rubbery copolymers of styrene and isoprene. These rubbery copolymers exhibit an excellent combination of properties for utilization in...
5336739 Alkyl tetrahydrofurfuryl ethers as anionic polymerization modifier in the synthesis of rubbery polymer  
It has been unexpectedly discovered that various compounds, such as alkyl tetrahydrofurfuryl ethers, can be used to modify anionic polymerizations of conjugated diene monomers. These modifiers can...
5328936 Polymerization process for making porous polymeric particles  
A process for making porous polymeric particles having high surface area includes suspending a discontinuous organic phase in an continuous aqueous phase, wherein the organic phase includes an...
5312871 Free radical polymerization process  
This invention concerns a "living" free radical polymerization process for preparing polymers having a narrow distribution of molecular weights.
5300599 Modifier for anionic polymerization of diene monomers  
It has been unexpectedly discovered that salts of tetrahydrofurfuryl alcohols, such as the lithium, potassium, and sodium salts of tetrahydrofuryl alcohols, can be used to modify anionic...
5266667 Method and system for priming anionic polymerization of (meth)acrylates  
This system for priming the animic polymerization of (meth)acrylates includes at least one primer of the formula R--M (I) in which M represents a metal selected from alkaline and alkaline earth...
5231153 Anionic polymerization of conjugated dienes modified with alkyltetrahydrofurfuryl ethers  
It has been unexpectedly discovered that various compounds, such as alkyl tetrahydrofurfuryl ethers, can be used to modify anionic polymerizations of conjugated diene monomers. These modifiers can...
5194535 Process for production of alkadiene-based polymer of increased vinyl content  
An improved process for the production of conjugated alkadiene-based polymers of higher vinyl content employs as a structure modifier a compound of the formula ##STR1## wherein R is alkylene, R'...
5171800 Anionic polymerization with bifunctional initiators  
An organic compound of an alkali metal, of the formula I ##STR1## which is obtained by reaction of an appropriate diarylethylene of the formula II with an alkali metal (M), especially lithium,...
5171810 Crosslinkable poly(unsaturated carbosilane) copolymers and methods of making same  
Random or block copolymers with (1-hydro-1-R-1-sila-cis-pent-3-ene), poly(1-hydro-1-R-3,4 benzo-1-sila pent-3-ene), and disubstituted 1-silapent-3-ene repeating units of the general formula...
5169916 Crosslinkable poly(unsaturated carbosilane) polymers and methods of making same  
Poly(1-hydro-1-R-1-sila-cis-pent-3-ene) and poly(1-hydro-1-R-3,4 benzo-1-sila pent-3-ene) polymers having repeating units of the general formula ##STR1## where R is hydrogen, an alkyl radical...
5112929 Oxolanyl cyclic acetals as anionic polymerization modifiers  
A method for preparing a diene polymer or copolymer having increased amounts of 1,2-microstructure is provided. The method involves polymerizing a diene monomer or mixture of a diene monomer and a...
5008343 Process for the preparation of polymers based on conjugated dienes and optionally monovinylaromatic compounds  
A block-free polymer is prepared by anionically polymerizing at least two compounds selected from the groups consisting of butadiene, isoprene and styrene in an inert organic solvent in the...
4997896 Process and catalyst system for synthesizing trans-1,4-polybutadiene  
Trans-1,4-polybutadiene is a thermoplastic resin rather than a rubber at room temperature by virtue of its high degree of crystallinity. Because trans-1,4-polybutadiene contain many double bonds in...
4980432 Anionic (co)polymerization using an arylmethide initiator  
Process for the preparation of polymers by anionic (co)polymerization of ethylenically unsaturated organic monomers in the presence of an arylmethide initiator of the following general structure:...
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...
4894425 Preparation of polyisoprene having high content of 1,2- and 3,4-structural units by anionic polymerization  
Polyisoprenes having a high content of 1,2- and 3,4-structural units, a process for their preparation, and their use. The previous processes for the preparation of polyisoprene having a high...
4710554 Polybutadiene and process for preparing the same  
A polybutadiene having an average 1,2-bond content of 18 to 32% by mole, a branched polymer chain content of 60% by weight or more and a Mooney viscosity at 100° C. of 40 to 90, the viscosity of a...
4696986 Modifier for lithium catalysts  
It has been determined that 1,2,3-trialkoxybenzenes and 1,2,4-trialkoxybenzenes can be utilized in order to increase the vinyl content of polydienes which are prepared utilizing lithium catalyst...
4694059 Polyalloocimene and method for the preparation thereof  
A novel class of alloocimene polymers have been prepared which are comprised of a mixture of polymer chain units of 2,3-alloocimene and 6,7-alloocimene. The novel polyalloocimenes of this invention...
4656237 High solids acrylic coating systems  
High solids acrylic coating compositions are formulated by using as a reactive diluent, a low molecular weight hydroxyl-containing acrylic polymer. These polymers are prepared at about 15°-20° C....
4647635 Initiator systems for polymerization of 1,3-dienes or copolymers containing 1,3-dienes  
A process and a catalyst system is disclosed herein for preparation of medium to high vinyl (co)polymers containing a 1,2-microstructure of between 30 and about 90 percent. The catalyst system...
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...
4577002 Elastomeric copolymers, their preparation and their use  
The invention relates to elastomeric copolymers of an aromatic vinyl compound and a conjugated diene, suitable for use in the tread portion of a pneumatic tire, which copolymers have a vinyl...
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...
4530985 Process for the preparation of polymers comprising conjugated dienes and optionally monoalkenyl aromatic hydrocarbons  
Process for the preparation of polymers comprising conjugated dienes and optionally monoalkenyl aromatic hydrocarbons, which process comprises the polymerization of conjugated diene and optionally...
4499248 Poly-diisopropenyl benzene synthesis  
It has been unexpectedly found that meta-diisopropenyl benzene can be polymerized into poly-m-diisopropenyl benzene with a relatively narrow molecular weight distribution and with only a small...
4478953 Polymerization process of optically active polymer and catalyst therefor  
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...
4429091 Oligomeric oxolanyl alkanes as modifiers for polymerization of dienes using lithium-based initiators  
A process and catalyst system is disclosed herein for the preparation of (co)polymers having a 1,2-microstructure of between 20 and 95 percent. These (co)polymers are prepared in a hydrocarbon or...
4424322 Process for producing polymers or copolymers of conjugated dienes  
A process for producing polymers of a conjugated diene, copolymers of a conjugated diene and another conjugated diene, or copolymers of conjugated diene and a vinyl aromatic hydrocarbon, which...
4397994 High vinyl polybutadiene or styrene-butadiene copolymer  
High vinyl polybutadiene or styrene-butadiene copolymer obtained by polymerizing 1,3-butadiene alone or with styrene in a hydrocarbon solvent using an organolithium compound as an initiator and...
4385151 Composition containing isoprene polymer  
A rubber composition containing an isoprene homopolymer or copolymer having a glass transition temperature of not less than -50° C. and a Mooney viscosity of 20 to 120. The composition can provide...
4367325 Styrene-butadiene random copolymer and process for the production thereof  
Styrene-butadiene random copolymers having an average vinyl content of at least 70%, a breadth of the distribution of vinyl contents of at least 20%, a Mooney viscosity (ML 1 +4, 100° C.) of 10 to...
4351924 ω-, and α,ω-Hydroxyhydrocarbyl-(alkyl methacrylate) polymers and process  
Alkyl methacrylate polymers which have one or more hydroxyhydrocarbyl end groups and a process for making them employing an anionic initiator followed by hydrolysis. The polyfunctional polymers are...
Matches 51 - 100 out of 212 < 1 2 3 4 5 >