Patent ID: 7569639

Claim:
A rubber composition for ice and snow roads, comprising 100 parts by weight of a sulfur-vulcanizable rubber (A) and, as a vulcanization agent, 0.1 to 30 parts by weight of a cyclic polysulfide (B) having the formula (I): wherein R is a substituted or unsubstituted C 2 to C 20 alkylene group, substituted or unsubstituted C 2 to C 20 oxyalkylene group or alkylene group having an aromatic ring, n is an integer of 1 to 20 and x is an average number of 2 to 6; and (C) a heat expandable thermoplastic resin or heat expandable graphite, wherein the sulfur-vulcanizable rubber (A) is a sulfur-vulcanizable rubber mainly composed of natural rubber and/or polybutadiene rubber, the blended amount of the cyclic polysulfide having the formula (I) is 0.1 to 10 parts by weight and wherein the composition further contains 10 to 100 parts by weight of a softening agent having a weight average molecular weight, converted to polystyrene, of 100,000 or less.