| 摘要 |
PROBLEM TO BE SOLVED: To suppress increase with time in hardness of a rubber composition for a tire tread etc. having an improved friction on ice. SOLUTION: A rubber composition for a tire comprises (i) 100 pts.wt. of a diene-based rubber, and (ii) 0.5 to 25 pts.wt. of a heat-expandable microcapsule including a substance capable of vaporizing or expanding under heating to thereby generate a gas and a nonpolar oil, both encapsulated in a thermoplastic resin particle, wherein a shell of the heat-expandable microcapsule is made of a thermoplastic resin obtained by polymerization of a nitrile-based monomer (I), a monomer (II) having an unsaturated double bond and a carboxyl group in the molecule thereof, an optional monomer (III) having two or more polymerizable double bonds, and an optional copolymerizable monomer (IV) for adjusting the expansion properties. COPYRIGHT: (C)2009,JPO&INPIT
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