RUBBER COMPOSITION AND TIRE USING SAME

摘要

Disclosed is a rubber composition having a high storage modulus (G') which is excellent in workability, fracture behavior, wear resistance and low heat generation properties. Specifically disclosed is a rubber composition containing not less than 20 prats by mass of a reinforcing filler (B) and 5-60 parts by mass of a low molecular-weight aromatic vinyl compound-conjugated diene compound copolymer C per 100 parts by mass of a rubber component (A) which contains not less than 10% by mass of a modified conjugated diene polymer having at least one functional group. The low molecular-weight aromatic vinyl compound-conjugated diene compound (C) is characterized in that the aromatic vinyl compound content is 5-80% by mass, the vinyl bond content in the conjugated diene compound unit is 10-80% by mass and the weight average molecular weight in terms of polystyrene as determined by gel permeation chromatography is 5,000-300,000.