Patent ID: 8404766

Claim:
A rubber composition for tread comprising 0.5 to 10 parts by mass of (B) an alkylphenol-sulfur chloride condensate indicated by the formula (B1): wherein R 1 to R 3 are octyl groups; x and y are same or different, and either is an integer of 2 to 4; n is an integer of 0 to 10, 0.5 to 6 parts by mass of (C) sulfur, 10 to 100 parts by mass of (D) silica, and 5 to 12 parts by mass of at least one silane coupling agent selected from the group consisting of a bis(3-triethoxysilylpropyl)disulfide and a silane coupling agent of mercapto series, based on 100 parts by mass of (A) a rubber component comprising 20 to 80% by mass of a modified styrene-butadiene rubber having an alkoxysilyl group at terminal and/or a butadiene rubber having an ethoxysilyl group at terminal and 20 to 80% by mass of at least one diene rubber selected from the group consisting of a natural rubber, an isoprene rubber, a butadiene rubber, a tin-modified butadiene rubber and a polybutadiene rubber comprising 1,2-syndiotactic crystals.