Patent ID: 7338999

Claim:
A rubber composition for tire tread comprising, based on 100 parts by weight of a diene rubber (A), (i) 5 to 100 parts by weight of inorganic filler (B) represented by the following formula (I): kM 1 *xSiO y *zH 2 O (I) in which M 1 is at least one metal, one oxide thereof or one hydroxide thereof, said metal being selected from the group consisting of Al, Mg, Ti and Ca, k is an integer of 1 to 5, x is an integer of 0 to 10, y is an integer of 2 to 5 and z is an integer of 0 to 10, (ii) 15 to 85 parts by weight of carbon black (C) having nitrogen adsorption specific surface area of 70 to 300 m 2 /g, (iii) 1 to 10 parts by weight of silica (E) having nitrogen adsorption specific surface area of 100 to 300 m 2 /g, (iv) based on the weight of the inorganic filler (B), 0.1 to 150% by weight of a polyether compound (F) represented by the following formula (III): wherein R 1 is a hydrogen atom or a substituent selected from the group consisting of a hydrocarbon group having 1 to 50 carbon atoms, a siloxy silyl propyl group having 1 to 50 silicon atoms and a group represented by the formula -(AO) m —R 2 , and R 1 may be one kind or different kinds; and in the formula, R 2 is a hydrogen atom or a substituent selected from the group consisting of a hydrocarbon group having 1 to 42 carbon atoms and a siloxy silyl propyl group having 1 to 40 silicon atoms, A is an alkylene group having 2 to 3 carbon atoms, m is an integer of 1 to 100 and A, the number of which is represented by m, may be the same or different; and (v) a silane coupling agent (D).