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US 5,179,154 AGranted
Rubber compositions for tire tread
AssigneeThe Yokohama Rubber Co., Ltd.
InventorsTakao Muraki, Kazuyoshi Kayama, Kinya Kawakami
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Abstract
Rubber compositions are disclosed for use in the tread portions of automotive tires. A selected class of starting rubbers are combined with specified amounts of a selected type of carbon black having well balanced N.sub.2 SA, 24M4DBP and .DELTA.Dst properties. The use of this carbon black is conductive to enhanced driving stability and other important physical characteristics of the tire.
Claims3
A rubber composition for use in automotive tire treads, which comprises:
- (a) 100 parts by weight of a starting rubber comprising at least one styrene-butadiene copolymer rubber having a glass transition temperature (Tg) of higher than -40.degree. C.;
- and
- (b) 50-200 parts by weight of carbon black having an N.sub.2 SA in the range of 110-140 m.sup.2 /g as defined by nitrogen adsorption surface area, a 24M4DBP in the range of 85-95 ml/100 g as defined by ASTM D-3493, a .DELTA.Dst of less than 55 m.mu. as defined by the half value width of a centrifugally classified aggregate size distribution and a .DELTA.Dst/N.sub.2 SA ratio less than 0.43.
Dependencies are inferred from the claim text.