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| Solvent-resistant, compatible blends of polyphenylene ethers and linear polyesters |
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| Process for preparing thermoplastic resin |
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| Thermoplastic resin composition |
| What is claimed is: 1. A thermoplastic resin composition which comprises: (a) 100 parts by weight ... |
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| Luminescent material |
| What is claimed is: 1. A luminescent beryllium-containing silicate, activated by bivalent europium ... |
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| Polymeric compositions of styrene and amorphous polyolefins useful in preparing hot melt adhesives |
| I claim: 1. A process for preparing polymeric compositions having a styrene content of about 1 to ... |
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| Peroxide treated substantially amorphous polyolefins useful as pressure-sensitive adhesives |
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| Hot-melt adhesvies for bonding polyethylene |
| We claim: 1. An adhesive composition capable of being used as a hot-melt adhesive comprising a ... |
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| Hot-melt adhesive compositions |
| We claim: 1. A hot-melt adhesive composition comprising (1) from about 55 to about 95 weight % of ... |
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| Biocompatible polymer articles |
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In-situ anionic continuous dispersion polymerization process
| Details |
Inventors: Hall, James E.; Roggeman, David M.;
Assignee: Bridgestone Corporation (Tokyo, JP)
Primary Examiner: Mulcahy; Peter D.
Assistant Examiner:
Attorney, Agent or Firm: Troy, Sr.; Frank J.
The present invention relates to a process for the dispersion copolymerization of 35 to 70% by weight of vinyl substituted aromatic monomer and 30 to 65% by weight of conjugated diene monomer comprising carrying out the copolymerization in a reaction mixture containing a liquid aliphatic hydrocarbon dispersing medium, an anionic catalyst system, and an "A" block of a copolymer dispersing agent, the dispersing agent having at least two polymer blocks wherein at least one of the polymer blocks is soluble in the dispersing medium and at least another of the polymer blocks is insoluble in the dispersing medium and is formed in situ. |
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DETAILED DESCRIPTION OF THE INVENTION The copolymer rubbers prepared by the process of the instant invention are copolymers formed by the continuous copolymerization of at least one conjugated diene monomer and at least one vinyl substituted aromatic monomer.
A random copolymer is defined as a copolymer of a diene monomer and a vinyl aromatic monomer (VAM) in which no more than 5% by weight of the copolymer is composed of VAM blocks of 10 or more VAM units.
Preferably, no more than 5% by weight of the VAM is contained in blocks of 10 or more VAM units.
Most preferably, 100% of VAM units are in blocks of less than 10 VAM units and 80% of VAM units are in blocks of less than 5 VAM units.
This definition applies to polymers having less than 50% by weight of styrene content.
Somewhat higher levels can be tolerated at 50-70% styrene levels in SBR.
The conjugated diene monomers utilized in the synthesis of such copolymer rubbers generally contain from 4 to 12 carbon atoms.
Diene monomers containing from 4 to 8 carbon atoms are generally preferred for commercial purposes.
For similar reasons, 1,3-butadiene and isoprene are the most commonly utilized conjugated diolefin monomers.
Some additional conjugated diolefin monomers that can be utilized include 2,3-dimethyl-1,3-butadiene, piperylene, 3-butyl-1,3-octadiene, 2-phenyl-1,3-butadiene, and the like, alone or in admixture.
Vinyl substituted aromatic hydrocarbon monomers, also referred as vinyl aromatic monomers suitable for use in preparing the random copolymers of this invention include any vinyl or alphamethyl vinyl aromatic compounds capable of being polymerized by an anionic initiator.
Particularly useful monomers for this purpose are vinyl aryl and alphamethyl-vinyl aryl compounds such as styrene, alphamethyl styrene, vinyl toluene, vinyl naphthalene, alphamethylvinyl toluene, vinyl diphenyl, and corresponding compounds in which the aromatic nucleus may have other alkyl derivatives up to a total of 8 carbon atoms.
Certain vinyl substituted aromatic monomers are not suitable for use in this dispersion polymerization process because homopolymers of these monomers are soluble in linear alkane solvents such as hexane and their copolymers with diene are also soluble
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Adhesives and Rubbers 
