Branched styrene-butadiene copolymers and pneumatic tires...

Details Branched styrene-butadiene copolymers and pneumatic tires... Branched styrene-butadiene copolymers and pneumatic tires...

C - Chemistry, Metallurgy

08

C

152/124, 402/453

C08C 19/44 (2006.01) B60C 1/00 (2006.01) C08L 9/06 (2006.01)

Patent

CA 1234950

Abstract of the Disclosure A branched styrene-butadiene copolymer and a pneumatic tire using the same as a tread base rubber are disclosed. This copolymer is produced by coupling an active styrene-butadiene copolymer anion, which is obtained by polymerizing styrene and butadiene in a hydro- carbon solvent in the presence of ether or a tertiary amine and an initiator of an organolithium compound, with a tin halide compound. In the copolymer, the ratio of branched copolymer connected with tin-butadienyl bond is at least 20% by weight, and the content of bound styrene is not less than 3% by weight but less than 25% by weight, and the content of vinyl bond in butadiene portion is not less than 30% but less than 50%. - 30 -

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