Styrene-butadiene copolymer rubber composition

Details Styrene-butadiene copolymer rubber composition Styrene-butadiene copolymer rubber composition

C - Chemistry, Metallurgy

08

F

400/1100, 402/45

C08F 36/06 (2006.01) C08C 19/44 (2006.01) C08L 21/00 (2006.01)

Patent

CA 1228696

Abstract of the Disclosure Disclosed herein is a rubber composition comprising at least 20% by weight of styrene-butadiene copolymer based on the total weight of the rubber content. The styrene-butadiene copolymer is obtained by randomly copolymerizing styrene with 1,3-butadiene in a hydrocarbon solvent in the presence of an organo- lithium compound as an initiator and then subjecting to a coupling reaction with a polyfunctional coupling agent, and contains 30-70% by weight of branched polymers therein, and has the following properties: (a) a content of bound styrene in the copolymer is 3-15% by weight; (b) a content of vinyl bonds contained in the butadiene units is 15-30% by weight; (c) a Mooney viscosity (M Image ) is 15-50; and (d) a molecular weight distribution of the copolymer is bimodal at a ratio Mw/Mn of 1.4-2.2 in which Mw is a weight-average molecular weight and Mn is a number-average molecular weight.

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