| 摘要 |
PURPOSE:To obtain a modified rubber composition increased in resiliency and decreased in JIS hardness at low temperature, by adding a modified diene polymer rubber obtained by reacting an alkali metal-containing diene polymer rubber with a specified aminosilane compound to a rubber component. CONSTITUTION:A rubber composition comprising a rubber component and additives, wherein said rubber component contains at least 10wt.% modified diene polymer rubber prepared by reacting either a diene polymer rubber having active alkali metal terminals or a conjugated diene rubber to which an alkali metal has been added with an aminosilane compound of formula 1. In formula 1, R1, R2 and R3 are each alkyl or alkoxy, R4 and R5 are each alkyl, and n is an integer. As said aminosilane compound, 3-dimethyl aminopropyldiethoxymethylsilane is particularly preferable.
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