Pneumatic tires
US4387756A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 9, 1981 |
| Grant date | Jun 14, 1983 |
| Priority date | — |
| Expiry date | Sep 9, 2001 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T152/10495
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A pneumatic tire having a tread is disclosed, which comprises using in said tread a rubber composition containing 10 to 120 parts by weight of carbon black and 0.5 to 5 parts by weight of a vulcanizer based on 100 parts by weight of a novel styrene-butadiene copolymer rubber as defined below alone or a blend rubber of not less than 30 parts by weight of said copolymer rubber and not more than 70 parts by weight of the other diene rubber, said styrene-butadiene copolymer rubber being obtained by random copolymerization of styrene with 1,3-butadiene and satisfying the following requirements: PA1 (1) a content of bound styrene is 12 to 35% by weight; PA1 (2) a content of 1,2-bond in butadiene portion is 25 to 45% by weight; PA1 (3) a content of trans-1,4 bond in butadiene portion is not less than 42% by weight; PA1 (4) a value obtained by subtracting a content of cis-1,4 bond in butadiene portion from said content of trans-1,4 bond is not less than 8% by weight; PA1 (5) a relation between said content of bound styrene and said content of 1,2-bond is 65.ltoreq.1.7.times.the content of bound styrene (% by weight)+the content of 1,2-bond (% by weight).ltoreq.100; and PA1 (6) a ratio of w…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.