| 摘要 |
PURPOSE:The titled rubber having a large hysteresis loss and excellent breaking strength and elongation breaking behavior and being suitable as a vibrationproof material, comprising styrene/conjugated diene copolymer obtained by emulsion polymerization and having a specified combined styrene content and a specified intrinsic viscosity. CONSTITUTION:A styrene/conjugated diene copolymer rubber obtained by emulsion polymerization and having an average combined styrene content of 40-70wt%, a distribution range of the composition of the combined styrene >=30%, said copolymer being distributed over the entire range of this composition distribution, and an intrinsic viscosity (in toluene at 30 deg.C) of 0.1-6dl/g. When the distribution range of the composition of the combined styrene in said copolymer rubber is narrower than 30%, the temperature dependency of the hysteresis loss of the rubber increases, which is undesirable for vibrationproof performance. The particularly desirable conjugated diene of the copolymer rubber is butadiene.
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