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1. A rubber composition for a tire tread comprising:
a diene rubber; a silica; a sulfur-containing silane coupling agent; and an alkyl triethoxysilane represented by Formula (I); a content of the silica being from 60 to 200 parts by mass per 100 parts by mass of the diene rubber, the sulfur-containing silane coupling agent being a polysiloxane represented by the following Formula (1); a content of the sulfur-containing silane coupling agent being from 1 to 20 mass % relative to the content of the silica, and a content of the alkyl triethoxysilane being from 0.2 to 20 mass % of the content of the silica;
(A)a(B)b(C)c(D)d(R1)eSiO(4-2a-b-c-d-e)/2 (1)wherein Formula (1) is an average composition formula, and in Formula (1), 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; R1 is a monovalent hydrocarbon group having from 1 to 4 carbon atoms; and a to e satisfy the relational expressions 0≦a<1, 0≦b<1, 0<c<3, 0<d<1, 0≦e<2, and 0<2a+b+c+d+e<4; however, one of either a or b is not 0; wherein in Formula (I), R is an alkyl group having from 7 to 20 carbon atoms. |
