Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Polymers from only ethylenic monomers or processes of...
Patent
1994-07-28
1995-03-07
Teskin, Fred
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Polymers from only ethylenic monomers or processes of...
526173, 526340, 5253323, 5253329, 525342, C08F 214, C08F 448, C08F23610
Patent
active
053959027
ABSTRACT:
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 a block copolymer dispersing agent comprising 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 the dispersing agent acts to disperse a random copolymer of vinyl substituted aromatics and conjugated dienes formed in the presence of the dispersing agent.
REFERENCES:
patent: 3402160 (1968-09-01), Hayes
patent: 4098980 (1978-07-01), Markle et al.
patent: 4452960 (1984-06-01), Throckmorton
patent: 4942209 (1990-07-01), Gunesin
patent: 5270395 (1993-12-01), Gunesin et al.
Bridgestone Corporation
Teskin Fred
Troy, Sr. Frank J.
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