Tire tread comprised of branched styrene-butadiene copolymers

Details Tire tread comprised of branched styrene-butadiene copolymers Tire tread comprised of branched styrene-butadiene copolymers

1984-09-28

1986-08-05

Ball, Michael

Resilient tires and wheels

Tires, resilient

Anti-skid devices

5253323, C08F 818

Patent

active

046037225

ABSTRACT:
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 hydrocarbon 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%.

REFERENCES:
patent: 4397994 (1983-08-01), Takeuchi et al.
patent: 4441236 (1984-04-01), Kan et al.

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