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US 5,206,283 AGranted
Rubber composition for automobile tires
AssigneeThe Yokohama Rubber Co., Ltd.
InventorsKinya Kawakami, Takao Muraki, Shigeru Shinoda
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Abstract
Rubber compositions for use in tire treads are disclosed. One or more selected styrene-butadiene rubbers of specified glass transition temperatures are blended with a selected type of carbon black of specified physical characteristics. The composition is highly stable in runnability on dry, wet and snowy roads.
Claims4
A rubber composition for use as tread portions in automobile tires, which comprises:
- (a) a base rubber comprising at least one styrene-butadiene rubber having a glass transition temperature of lower than -40.degree. C.;
- and
- (b) a carbon black in an amount of from 30 to 100 parts by weight per 100 parts by weight of said base rubber, said carbon black having an N.sub.2 SA of form 110 to 140 m.sup.2 /g as determined by nitrogen adsorption, a 24M4 DBP of from 85 to 95 ml/100 g as determined by dibutyl phthalate adsorption, a .DELTA.Dst of smaller than 55 m.mu. as determined by aggregate size distribution, a {Dst to N.sub.2 Sa ratio of less than 0.43 and a .DELTA.Hs not exceeding 12 as determined by hardness difference at two varying temperatures.
Dependencies are inferred from the claim text.