| abstract |
A kind of rubber composition for tire tread and use it for the pneumatic tire of tire tread, the rubber composition for tire tread contains the polysiloxanes shown in diene series rubber composition, silica and following average composition formulas (1), specific modified conjugated diene rubber of the diene series rubber composition comprising more than 20 mass %, the silica is 60~200 mass parts relative to the mass parts of the rubber constituent 100, and the polysiloxanes is 1~20 mass % of the content of the silica.(A) a (B) b (C) c (D) d (R 1 ) e SiO (4‑2a‑b‑c‑d‑e)/2 (1) [in formula (1), A represents the divalent organic group containing thioether group, and B represents 1 valency alkyl of carbon number 5~10, and C represents hydrolization group, and D represents the organic group containing sulfydryl, R 1 1 valency alkyl of carbon number 1~4 is represented, and meets 0≤a ＜ 1,0≤b ＜ 1,0 ＜ c ＜ 3,0 ＜ d ＜ 1,0≤e ＜ 2, the relational expression of 0 ＜ 2a+b+c+d+e ＜ 4.Wherein, one of a, b are not 0.]. |