Patent ID: 7981966

Claim:
A rubber composition mainly comprising (I) 1 to 10% by weight of a conjugated diene-based (co)polymer rubber represented by the following formula (1) having an amino group and an alkoxysilyl group on a polymer chain and having a weight average molecular weight of 1,000 to 70,000, and (II) 99 to 90% by weight of a conjugated diene-based (co)polymer rubber having a weight average molecular weight of 100,000 to 2,000,000 (with the proviso that (I)+(II)=100% by weight), wherein P is a (co)polymer chain comprising a conjugated diene and an aromatic vinyl compound, R 1 is an alkylene group having 1 to 12 carbon atoms, R 2 and R 3 are each independently an alkyl group having 1 to 20 carbon atoms or an aryl group, n is an integer of 1 or 2, m is an integer of 1 or 2, and k is an integer of 1 or 2, with the proviso that n+m+k is an integer of 3 or 4.