Rubber composition for tires, and pneumatic tire using same

Abstract

Provided is a rubber composition for tires, comprising: diene rubber contained in the quantity of 100 parts by mass; silica contained in the quantity of 60-200 parts by mass; polysiloxane represented by averaged compositional formula (1), and contained in the quantity of 1-20 mass% with respect to the quantity of silica; and a thiuram disulfide vulcanization accelerator contained in the quantity of 0.05-3.0 parts by mass. 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 0≤a<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 rubber composition for tires in tire tread.

Description

Technical field [0001] The present invention relates to a rubber composition for tires and a pneumatic tire using the rubber composition for tires. Background technique [0002] In the past, tires used in vehicles have been required to improve wet performance (wet gripping performance) from the perspective of safety during driving, and to reduce the rolling resistance of tires from the perspective of fuel efficiency. Faced with such problems, it is known that silica is added to the rubber component constituting the tire tread, but the affinity between silica and the rubber component is low, and the cohesion between silica is high, so even in rubber Only silica is blended into the components, and silica is not dispersed, and there is a problem that the effect of reducing rolling resistance and the effect of improving wet performance cannot be sufficiently obtained. [0003] In response to such problems, it is known that a mercaptosilane (a silane coupling agent having a mercapto gr...

AI Technical Summary

Problems solved by technology

To face such a problem, it is known to mix silica into the rubber component constituting the tire tread portion, but the affinity between silica and the rubber component is low, and the cohesion between silica is high, so even in rubber Only silicon dioxide is added to the ingredients, and the silicon dioxide is not dispersed, and there is a problem that the effect of reducing the rolling resistance and the effect of improving the wet performance cannot be sufficiently obtained.

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