Patent ID: 7829621
Filing Date: 2010-11-09
Classification: C08K,C08L

Abstract:
1. A rubber composition comprising: a diene rubber, 50 to 120 parts by weight of a reinforcing filler containing carbon black based on 100 parts by weight the diene rubber, of which a nitrogen adsorbing-specific surface area is 100 to 250 m 2 to 50 parts by weight of a styrene-butadiene polymer of which the weight average molecular weight is 1,000 to 15,000, the amount of a styrene is 17 to 27% by weight and the amount of vinyl contribution from butadiene is 60 to 80% by weight: and 2 to 25 parts by weight of an indene resin, of which the melting point is 100 to 150° C. based on 100 parts by weight of the diene rubber which comprises 60 to 95% by weight of a solution polymerization styrene-butadiene rubber, wherein weight average molecular weight is 500,000 to 2,500,000, the amount of styrene is 20 to 40% by weight and the amount of vinyl contribution from butadiene is 30 to 60% by weight and 5 to 40% by weight of a natural rubber and/or a butadiene rubber, and the rubber composition further comprising 2 to 12 parts by weight of a silane coupling agent represented by the following formula: wherein n is an integer of 1 to 3, m is an integer of 1 to 4 and the average value of 1 is 1.8 to 3.5 based on 100 parts by weight of said silica, and the rubber composition is obtained by kneading at a condition of at least 150° C.