Branched styrene-butadiene copolymers and pneumatic tires using

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

1983-03-08

1985-07-02

Schofer, Joseph L.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Mixing of two or more solid polymers; mixing of solid...

525 99, 525315, 525371, C08F 842

Patent

active

045269343

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: 4304886 (1981-12-01), Bean, Jr. et al.
patent: 4311803 (1982-01-01), Smith et al.

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