Rubber composition for tire tread

Abstract

A rubber composition for a tire tread which improves grip performance on dry pavement and wet pavement and driveability is provided. The rubber composition includes 100 parts by weight of a rubber component comprising from 50 to 95 parts by weight of a copolymer rubber having a glass transition point of −40° C. or higher obtained by copolymerization of 1,3-butadiene with styrene using an organic lithium compound as an initiator, from 5 to 20 parts by weight of an epoxidized natural rubber having a degree of epoxidation of from 5 to 60% by weight, and from 0 to 45 parts by weight of other diene rubber; from 20 to 100 parts by weight of silica; and from 0 to 100 parts by weight of carbon black, the total amount of silica and carbon black being from 70 to 150 parts by weight, and further includes a silane coupling agent in an amount of from 2 to 25 parts by weight per 100 parts by weight of the silica.

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