| 摘要 |
A rubber composition for a tire tread comprising: a diene rubber; a silica having an N 2 SA of from 194 to 225 m 2 /g and a CTAB of from 180 to 210 m 2 /g; and a polysiloxane represented by the average composition formula of formula (1) and contained in an amount of from 1 to 20 mass% with respect to the quantity of silica. (A) a (B) b (C) c (D) d (R 1 ) 3 SiO (4-2a-b-c-d-e)/2 [In the formula, A is a divalent organic group containing a sulfide group, B is a monovalent hydrocarbon group having from 5 to 10 carbon atoms, C is a hydrolyzable group, D is an organic group containing a mercapto group, and R 1 is a monovalent hydrocarbon group having from 1 to 4 carbon atoms, where 0 ‰¤ a < 1, 0 ‰¤ b < 1, 0 < c < 3, 0 < d < 1, 0 ‰¤ e < 2, 0 < 2a + b + c + d+ e < 4, and at least one of a and b is not 0]. Also provided is a pneumatic tire having tire treads formed using the rubber composition. |
