Rubber composition for tire and pneumatic tire

Abstract

The invention provides a rubber composition for a tire which has the great advantages of low heat build-up (high fuel economy), high wet grip performance, and high abrasion resistance, and a pneumatic tire with a tire component (especially, a tread) formed from the rubber composition. Provided is a rubber composition for a tire, including: a diene polymer; silica; and a compound represented by the formula (2) shown below, the diene polymer being a modified diene polymer obtained by reacting a compound (A) and a compound (B), and the compound represented by the formula (2) being present in an amount of 5 to 23 parts by mass per 100 parts by mass of the rubber component, wherein the compound (A) is an active alkali metal-terminated conjugated diene polymer obtained by polymerizing a conjugated diene monomer alone or with an aromatic vinyl monomer in the presence of a compound (C); the compound (B) is a modifying agent containing a functional group; the compound (C) is a chemical species obtained by reacting an organic alkali metal compound with a compound represented by the formula (1): wherein R1 and R2 are the same as or different from each other and each represent a hydrogen atom, a branched or unbranched alkyl group, a branched or unbranched aryl group, a branched or unbranched alkoxy group, a branched or unbranched silyloxy group, a branched or unbranched acetal group, a carboxy group, a mercapto group, or a derivative thereof, and A represents a branched or unbranched alkylene group, a branched or unbranched arylene group, or a derivative thereof; and the formula (2) is: R3—S—S—Y—S—S—R4  (2) wherein Y represents a branched or unbranched C2-10 alkylene group, and R3 and R4 are the same as or different from each other and each represent a monovalent branched or unbranched organic group containing a nitrogen atom.

Dependencies are inferred from the claim text.