Rubber composition containing cyclic polysulfide as vulcanization agent and pneumatic tire using the same
AssigneeThe Yokohama Rubber Co., Ltd.
InventorsWonmun Choi, Tomoyuki Matsumura, Naoya Amino, Kazuhiro Takase, Daisuke Kanenari, Takeshi Hotaka, Junichirou Natori
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Abstract
A rubber composition containing 100 parts by weight a sulfur-vulcanizable rubber (A) and 0.1 to 30 parts by weight of a vulcanization agent of a cyclic polysulfide (B) having the formula (I): wherein R is a substituted or unsubstituted C2 to C20 alkylene group, substituted or unsubstituted C2 to C20 oxyalkylene group or alkylene group having an aromatic ring, n is an integer of 1 to 20, x is a number of 2 to 6 on average.
Claims11
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 C2 to C20 alkylene group, substituted or unsubstituted C2 to C20 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.
Dependencies are inferred from the claim text.