Patent ID: 7253235

Claim:
A rubber composition for a tire comprising 5 to 200 parts by weight of a low molecular weight aromatic vinyl-conjugated diene copolymer (B) based on 100 parts by weight of a rubber component, other than the low molecular weight aromatic vinyl-conjugated diene copolymer, containing an aromatic vinyl-conjugated diene copolymer (A); wherein said aromatic vinyl-conjugated diene copolymer (A) has weight average molecular weight of 5.0×10 5 to 2.5×10 6 and aromatic vinyl content of 10 to 60% by weight; and said low molecular weight aromatic vinyl-conjugated diene copolymer (B) has weight average molecular weight of 1.0×10 3 to 1.0×10 5 and has an aromatic vinyl content of 10 to 75 % by weight, and is obtained by hydrogenating or epoxidizing a low molecular weight aromatic vinyl-conjugated diene copolymer, in which the amount of vinyl bonds in the conjugated diene part of copolymer (B) is 20 to 70%, and copolymer (B) has an hydrogenation ratio in the conjugated diene part of 20 to 55% or an epoxidization ratio of 3 to 60%.