Pneumatic tire having an improved chipping resistant property employing syndiotactic-1,2-polybutadiene in tread rubber
AssigneesBridgestone Tire Company Limited, Ube Industries, Ltd.
InventorsMasaki Ogawa, Tamio Araki, Shinji Yamamoto
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Abstract
A pneumatic tire having an improved chipping resistant property is disclosed. In the tire, the tread portion is formed with a vulcanizate of a rubber composition comprising 3-40 parts by weight of short fibers of syndiotactic-1,2-polybutadiene, 30-100 parts by weight of carbon black and 0.2-5 parts by weight of a p-phenylenediamine type antioxidant, on a basis of 100 parts by weight of a rubber selected from natural rubber, synthetic rubber and a blend thereof in an optional blending ratio.
Claims5
A pneumatic tire having an improved chipping resistant property, comprising a tread portion formed from a vulcanizate of a rubber composition comprising;
- (a) 3-40 parts by weight of preformed short fibers of syndiotactic-1,2-polybutadiene having a maximum diameter of not more than 10.mu. and an average diameter of less than 1.mu., (b) 30-100 parts by weight of carbon black having an iodine adsorption value of not less than 76 mg/g and (c) 0.2-5 parts by weight of a p-phenylenediamine type antioxidant, on a basis of 100 parts by weight of (d) a rubber selected from natural rubbers, synthetic rubbers and blends thereof in an optional blending ratio.
Dependencies are inferred from the claim text.