Tire tread comprised of branched styrene-butadiene copolymers
US4603722A · kind A · utility
Assignees
Inventors
Key dates
| Filing date | Sep 28, 1984 |
| Grant date | Aug 5, 1986 |
| Priority date | — |
| Expiry date | Sep 28, 2004 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB60C1/0016
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
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%.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.