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US 4,786,680 AGranted
Rubber composition for tire tread
AssigneeThe Yokohama Rubber Co., Ltd.
InventorsYukizi Suzuki, Yasushi Kikuchi
Life of this patent
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Abstract
A rubber composition for a tire tread, comprising natural rubber and/or polyisoprene rubber, a specific styrene-butadiene copolymer rubber, and halogenated butyl rubber.
Claims5
A rubber composition for a tire tread comprising:
- (a) 25 to 55 parts by weight of a rubber selected from the group consisting of natural rubber and polyisoprene rubber;
- (b) 5 to 15 parts by weight of a halogenated butyl rubber;
- (c) 70 to 30 parts by weight of a styrenebutadiene copolymer rubber including 10 to 30 wt. % of bonded styrene units and 25 to 80% of 1,2-vinyl bonds in the butadiene units and having at a molecular terminal or in a chain thereof an atomic group introduced thereinto and represented by formula (I):
- ##STR5## wherein E is O or S;
- and (d) 30 to 80 parts by weight, based on 100 parts by weight of the raw rubber, of carbon black.
2 more elements
Dependencies are inferred from the claim text.