Rubber composition for tread

Abstract

A rubber composition for a tread optimizing a vulcanization speed in a vulcanization step and, further, improving heat aging resistance is provided. A rubber composition for a tread comprising 20 to 90 parts by weight of silica, 0.5 to 2 parts by weight of (A) a guanidine vulcanization accelerator, 0.1 to 0.5 part by weight of (B) a thiuram vulcanization accelerator, and 0.5 to 2 parts by weight of (C) a sulfenamide vulcanization accelerator represented by the general formula (1): (wherein R is a linear alkyl group or a branched alkyl group having 1 to 18 carbons), based on 100 parts by weight of a rubber component.

Description

technical field [0001] The present invention relates to a rubber composition for treads. Background technique [0002] Among the various parts of the tire, the tread is the part that especially affects the rolling resistance of the tire. In order to reduce the rolling resistance, mixed silica is usually used as a reinforcing filler. [0003] Since the rubber composition for treads is prone to aging due to heat generated during running, it is required to have excellent heat aging resistance. [0004] In the step of vulcanizing the rubber composition for treads containing silica, when the vulcanization rate becomes high, problems such as premature vulcanization occur due to the influence of the silane coupling agent used in combination with silica, Therefore it is necessary to vulcanize at an appropriate vulcanization rate. [0005] Therefore, rubber compositions for treads containing silica are required to have excellent heat aging resistance ...

AI Technical Summary

Problems solved by technology

[0006] JP-A-2002-226629 discloses a rubber composition for treads containing tetrabenzylthiuram disulfide and N-cyclohexyl-2-benzothiazole sulfenamide As a vulcanization accelerator, but silica is not actively mixed, and when silica is used, there is a problem that silica adsorbs the vulcanization accelerator and vulcanization is delayed

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