Pneumatic tire having an improved resistance against heat build-up employing syndiotactic-1,2-polybutadiene fibers in tread base rubber
AssigneesBridgestone Tire Company Limited, Ube Industries, Ltd.
InventorsMasaki Ogawa, Tamio Araki, Shinji Yamamoto
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Abstract
A pneumatic tire having a cap/base structured tread and having an improved resistance against heat build-up and an improved wear resistance at the end of the use can be obtained by forming a tread base rubber of the tire with a vulcanizate of a rubber composition comprising specifically limited amounts of 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., carbon black, sulfur and natural or synthetic rubber.
Claims4
A pneumatic tire having a cap/base structured tread and having an improved resistance against heat build-up, comprising a tread base rubber formed from a vulcanizate, which has a rebound resilience value of at least 50% defined in JIS K6301, of a rubber composition comprising 3 to 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., 20 to 100 parts by weight of carbon black and 0.2 to 2 parts by weight of sulfur, on a basis of 100 parts by weight of a rubber selected from natural rubbers, synthetic rubbers and blends thereof in an optional blending ratio.
Dependencies are inferred from the claim text.