| 摘要 |
The rubber of the invention basically includes: (a) vinylaromatic/conjugated diene copolymer or conjugated diene monopolymer, coupled, of low molecular weight, approximately 10-50%, with a molecular weight of 5 x 10<4> - 35 x 10<4>, (b) vinylaromatic/conjugated diene copolymer, not coupled, of medium molecular weight, approximately 10-60% by weight, with a molecular weight of 10 x 10<4> - 80 x 10<4>, and (c) vinylaromatic/ conjugated diene copolymer, coupled, of high molecular weight, 5-60% by weight, with a molecular weight of 45 x 10<4> - 200 x 10<4>.
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