Patent ID: 7803866

Claim:
A rubber composition for a tire tread, comprising: 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 −15° 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 comprising a silane coupling agent in an amount of from 2 to 25 parts by weight per 100 parts by weight of the silica.