| abstract |
The invention relates to a rubber composition for tire tread, and a pneumatic tire. Provided is a rubber composition for tire tread, comprising: a diene rubber component containing 20 mass% or more of a specific denatured conjugated diene rubber; silica contained in the quantity of 60-200 parts by mass with respect to 100 parts by mass of said rubber component; and polysiloxane represented by averaged compositional formula (1), and contained in the quantity of 1-20 mass% with respect to the quantity of silica. Formula (1): (A)a(B)b(C)c(D)d(R1)eSiO(4-2a-b-c-d-e)/2 (In the formula, A represents a bivalent organic group containing a sulfide group, B represents a C5-10 monovalent hydrocarbon group, C represents a hydrolyzable group, D represents an organic group containing a mercapto group, R1 represents a C1-4 monovalent hydrocarbon group, and a-e satisfy the conditional formulae 0a<1, 0<=b<1, 0<c<3, 0<d<1, 0<=e<2, and 0<2a+b+c+d+e<4, with the caveat that either a or b is not 0.) Also provided is a pneumatic tire using said composition in tire tread. |