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US 6,472,461 B1Granted
Rubber composition for tires and pneumatic tire
AssigneeBridgestone Corporation
InventorsEiji Nakamura, Toshiyuki Ishikuro
Life of this patent
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AssigneeBridgestone Corporation
InventorsEiji Nakamura, Toshiyuki Ishikuro
Estimating the term…
A rubber composition includes a rubber component, a polyethylene short fiber, and a blowing agent. The rubber component has a polybutadiene and at least one natural rubber or synthetic diene rubber. The polybutadiene has a weight-average molecular weight of 5,000 to 30,000 obtained as a weight-average molecular weight corresponding to polystyrene and further has a content of a cis-1,4 structure of 60 to 98%. The rubber component is 6% by weight or more polybutadiene. The short fiber has an average length of 10 mm or shorter. A pneumatic tire includes the rubber composition and exhibits excellent braking ability on ice, excellent braking ability on wet road surfaces, and improved driving stability in the early driving period. The pneumatic tire exhibits remarkable improvement in braking ability on ice even after a base rubber is exposed by abrasion of a tread rubber.
A rubber composition which comprises (1) a rubber component comprising (a) at least one of natural rubber and synthetic diene rubbers and (b) a polybutadiene having a weight-average molecular weight of 5,000 to 30,000 obtained as a weight-average molecular weight corresponding to polystyrene, and (2) a polyethylene short fiber having an average length of 10 mm or shorter, wherein the polybutadiene is 6% by weight or more of the rubber component and has a content of a cis-1,4 structure of 60 to 98%, and further (3) a blowing agent.
A pneumatic tire comprising a tread part, wherein the tread part comprises a rubber composition (A) which comprises (1) a rubber component comprising (a) at least one of natural rubber and synthetic diene rubbers and (b) a polybutadiene having a weight-average molecular weight of 5,000 to 30,000 obtained as a weight-average molecular weight corresponding to polystyrene, and (2) a polyethylene short fiber having an average length of 10 mm or shorter, wherein the polybutadiene is 6% by weight or more of the rubber component and has a content of a cis-1,4 structure of 60 to 98%, and further (3) a blowing agent.
Dependencies are inferred from the claim text.