C - Chemistry – Metallurgy – 08 – F
Patent
C - Chemistry, Metallurgy
08
F
400/1115, 400/20
C08F 297/00 (2006.01) B60C 1/00 (2006.01) C08F 297/04 (2006.01) C08L 7/00 (2006.01) C08L 9/00 (2006.01) C08L 21/00 (2006.01) C08L 53/02 (2006.01)
Patent
CA 1182235
Abstract of the Disclosure A rubber composition suitable for use in tire tread is disclosed, which contains at least 20 parts by weight of a block copolymer per 100 parts by weight of total rubber content. This block copolymer comprises (A) a polymer segment obtained by starting from conjugated diolefin and monovinyl aromatic hydrocarbon and having a content of monovinyl aromatic hydrocarbon bond of not more than 10% by weight and (B) a copolymer segment obtained by copolymerization of conjugated diolefin and monovinyl aromatic hydrocarbon and having a content of monovinyl aromatic hydrocarbon bond of 15-50% by weight. Further, the block copolymer satisfies the following conditions: (i) the block copolymer contains at least 10% by weight of each of the segments (A) and (B); (ii) a total content of monovinyl aromatic hydrocarbon bond in the block copolymer is 10-40% by weight; (iii) an average content of vinyl bond in conjugated diolefin portion of the block copolymer is 20-70% by weight; and (iv) the block copolymer includes at least 20% by weight of a polymer having a metal-carbon bond in its molecular chain.
404326
Fujimaki Tatsuo
Sakakibara Mitsuhiko
Takashima Akio
Takeuchi Yasumasa
Tomita Seisuke
Bridgestone Tire Company Limited
Japan Synthetic Rubber Co. Ltd.
Swabey Ogilvy Renault
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