| 摘要 |
PURPOSE:To provide the titled rubber composition having improved impact resilience, and containing a rubber component composed of a specific styrene- butadiene copolymer rubber obtained by introducing a (thio)benzophenone compound in the molecular chain. CONSTITUTION:The objective composition contains a rubber component consisting of (A) 20-95wt% of a styrene-butadiene copolymer rubber having a bonded styrene content of 3-20wt%, 1,2-bond content in the butadiene unit of 50- 80wt% and a Mooney viscosity (ML1+4, 100 deg.C) of 20-150, and containing >=0.1mol of (thio)benzophenone compound residue in 1mol of the molecular chain, (B) 60-5wt% of natural rubber and/or polyisoprene rubber having a cis- 1,4-bond content of >=90% and (C) 50-0wt% of a polybutadiene rubber having a 1,2-bond content of <=20% and a Mooney viscosity of 20-100.
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