| 摘要 |
Conjugated diolefin-based copolymer rubber of a conjugated diolefin and an aromatic vinyl compound, wherein(1) the content of amino groups bound to the rubber (nitrogen content value) is 0.0025 to 0.20 mmol/g of copolymer rubber,(2) the content of the polymerization units of the aromatic vinyl compound is 5 wt % or more and less than 30 wt % based on the copolymer rubber, and the content of vinyl bonds in the polymerization unit of the conjugated diolefin (the total content of a 1,2-bond and a 3,4-bond) is 55 mol % or more based on the polymerization unit of the conjugated diolefin, or the content of the polymerization units of the aromatic vinyl compound is 30 to 50 wt % based on the copolymer rubber and the content of vinyl bonds in the polymerization unit of the conjugated diolefin is 25 to 55 mol % on the polymerization unit of the conjugated diolefin and(3) the molecular weight distribution is polymodal.
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