Rubber composition for tire tread and pneumatic tire using same

Abstract

A rubber composition for tire tread and a pneumatic tire using the same for tire tread, the rubber composition for tire tread contains diene rubber; N2SA is 194-225m2 / g, CTAB is 180-210m2 / g g of silicon dioxide; the polysiloxane shown in the average composition formula of formula (1); the content of the silicon dioxide is 60 to 200 parts by mass relative to 100 parts by mass of the rubber; the polysiloxane The content relative to the silicon dioxide is 1 to 20% by mass, (A)a(B)b(C)c(D)d(R1)eSiO(4-2a-b-c-d-e) / 2(1) [wherein, A represents a divalent organic group containing a thioether group, B represents a monovalent hydrocarbon group with 5 to 10 carbon atoms, C represents a hydrolyzable group, and D represents an organic group containing a mercapto group, R1 represents a monovalent hydrocarbon group with 1 to 4 carbon atoms, and 0≤a<1, 0≤b<1, 0<c<3, 0<d<1, 0≤e<2, 0<2a+b+ c+d+e<4, a≠b≠0. ].

Description

technical field [0001] The present invention relates to a rubber composition for tire treads and a pneumatic tire using the same. Background technique [0002] At present, it is required to reduce the rolling resistance of tires from the viewpoint of low fuel consumption during vehicle running. In addition, from the viewpoint of safety, it is required to improve wet performance. On the other hand, there is known a method of blending silica into a rubber component constituting a tread portion of a tire to achieve both low rolling resistance and wet performance. [0003] However, silica has the following problems: the affinity with the rubber component is low, and the cohesion between silicas is high, so even if only silica is blended in the rubber component, the silica does not disperse and cannot The effect of reducing rolling resistance and the effect of improving wet performance are sufficiently obtained. [0004] Among them, the present applicant proposed a rubber comp...

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Problems solved by technology

[0003] However, silica has the following problems: the affinity with the rubber component is low, and the cohesion between silicas is high, so even if only silica is blended in the rubber component, the silica does not disperse and cannot Sufficiently obtain the effect of reducing rolling resistance and the effect of improving wet performance

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