| 摘要 |
PURPOSE:A tire rubber composition improved in rolling friction resistance and processability, comprising a conjugated diolefin/vinyl aromatic hydrocarbon random copolymer formed by copolymerization and coupling with specified compounds. CONSTITUTION:A tire rubber composition containing at least 20% conjugated diolefin/vinyl aromatic hydrocarbon random copolymer formed by copolymerization in the presence of an organolithium polyfunctional initiator or copolymerization in the presence of an organomonolithium initiator and a polyfunctional monomer and by coupling with a compound containing a tin halide compound, said conjugated diolefin/vinyl aromatic hydrocarbon random copolymer having a vinyl aromatic hydrocarbon content of 3-60wt%, a content of copolymer- bonded tin >=400ppm, and a Mooney viscosity (ML1+4, 100 deg.C) of 20-200.
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