HIGH DISPERSIVE SILICA REINFORCED RUBBER COMPOUND

摘要

Provided are a rubber composition for a tire tread which is improved in the dispersion of silica and is enhanced in scotch stability, durability and abrasion resistance, and a tire provided with a tread part comprising the composition. The rubber composition comprises 100 parts by weight of a rubber material; 10-50 parts by weight of carbon black; 10-50 parts by weight of silica; 1-10 parts by weight of a coupling agent; and 0.5-5.0 parts by weight of a mixture of zinc soap and a fatty acid ester as a dispersant. The zinc soap is a zinc salt of fatty acid represented by RCOOZnCOOR and contains 1-6 wt% of zinc, and the fatty acid ester is an ester of a C12-C22 saturated or unsaturated fatty acid, wherein R is a C13-C22 alkyl group.