| 摘要 |
PURPOSE:To diene rubber composition having excellent processability, wet-skid characteristics, breakage characteristics, and dumping characteristics, suitable as a tire tread, etc., and containing more than a specific amount of a diene rubber obtained by blending a specific rubber having different vinyl aromatic hydrocarbon content. CONSTITUTION:The objective composition is a rubber blend containing 20- 50(wt)%, preferably 25-45% vinyl aromatic hydrocarbon obtained by mixing (A) an emulsion-polymerized diene copolymer rubber containing 15-30(wt)% vinyl aromatic hydrocarbon (e.g. styrene) and (B) an emulsion-polymerized diene copolymer rubber containing 40-70% vinyl aromatic hydrocarbon (the weight ratio of A/B is 20/80-80/20), or a rubber blend composed of >=20% said rubber blend and <=80% other diene rubber (e.g. natural rubber, polyisoprene rubber, etc.).
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