| 摘要 |
PROBLEM TO BE SOLVED: To provide a rubber composition for a tire tread exhibiting excellent braking performances on ice and abrasion resistance. SOLUTION: The rubber composition comprises 100 pts. wt. of a rubber component, comprising 50-80 pts. wt. of natural rubber and 50-20 pts. wt. of a polyisoprene rubber and/or a polybutadiene rubber, and, incorporated therewith, 1-10 pts. wt. of a thermally expandable thermoplastic resin particle having an initial average particle size of 20-80μm, a gas encapsulation ratio of at least 10% and an expansion-initiating temperature of at least 10°C higher than the vulcanization temperature of the rubber composition, where the ratio of the average particle size of the thermally expandable thermoplastic resin particle in the rubber composition after vulcanization at the vulcanization temperature to the initial average particle size is at most 1.3. COPYRIGHT: (C)2005,JPO&NCIPI
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