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US 5,326,810 AGranted
Rubber compositions for tire treads of driving stability
AssigneeThe Yokohama Rubber Co., Ltd.
InventorsTakao Muraki, Kinya Kawakami, Masayoshi Daio
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Abstract
Rubber compositions are disclosed for automobile tire treads. One or more SBR rubbers of higher than -40.degree. C. in Tg are combined with carbon black of specified N.sub.2 SA, DBP, .DELTA.DBP and .DELTA.Dst qualities. The resulting composition has enhanced tan .delta. at 0.degree. C. and 60.degree. C., breaking strength, breaking energy and abrasion resistance characteristics.
Claims3
A rubber composition for use in tire treads which comprises:
- (a) 100 parts by weight of a base rubber consisting essentially of one or more styrene-butadiene rubbers having a glass transition temperature higher than -40.degree. C., or a blend of one or more of said styrene-butadiene rubbers with a diene rubber selected from the group consisting of natural rubber, polyisoprene rubber, butadiene rubber, butyl rubber and halogenated butyl rubber;
- and
- (b) 50-200 parts by weight of a carbon black having an N.sub.2 SA of 140-160 m.sup.2 /g as defined by nitrogen adsorption surface area, a DBP of more than 120 ml/100 g as defined by dibutyl phthalate adsorption, a .DELTA.DBP of larger than 30 ml/100 g as determined by the difference of DBP subtracted by 24M 4 DBP and a .DELTA.Dst of smaller than 50 .mu.m as defined by aggregate size distribution of Dst diameter.
Dependencies are inferred from the claim text.