Rubber composition for tire

Abstract

The object is to improve rolling resistance properties and controllability / stability. Thus, disclosed is a rubber composition for a side-wall, a clinch or an insulation, which comprises: 100 parts by mass of a diene rubber component; 20 to 60 parts by mass of a filler, 1.0 to 4.0 parts by mass of sulfur, and 0.1 to 10 parts by mass of a vulcanization accelerator aid, wherein the diene rubber component comprises 10 to 70 mass% of at least one diene rubber component (a) selected from the group consisting of a solution-polymerization-modified styrene-butadiene rubber, a tin-modified butadiene rubber and a butadiene rubber modified with a compound represented by the formula (1) at its terminus and 20 to 80 mass% of a diene rubber component (b) that is different from the diene rubber component (a), and wherein the vulcanization accelerator aid is selected from the group consisting of a citraconimide compound, an organic thiosulfate compound, an alkyl phenol-sulfur chloride condensate, a compound represented by the formula (2) and a methacrylic acid metal salt represented by the formula (3).

Description

technical field [0001] The present invention relates to rubber compositions for sidewalls, clinches and / or barriers in tires. Background technique [0002] In recent years, for the purpose of saving energy, researchers have adopted various methods in order to reduce rolling resistance of tires (improving rolling resistance performance) or to improve steering stability of automobiles. These methods can be exemplified by selecting, among tire treads (inner layer and outer layer) having a two-layer structure, a rubber composition excellent in rolling resistance performance and handling stability as a base tread of the inner layer. In addition, use of a rubber composition excellent in rolling resistance and durability (crack growth resistance) for the tire sidewall, clinch, and insulation; use of a rubber composition excellent in wear resistance objects as tire laps. [0003] For the purpose of improving rolling resistance performance and handling stability, technologies for r...

AI Technical Summary

Problems solved by technology

[0004] However, in a diene-based rubber component such as a combination of butadiene rubber and natural rubber, when the rubber with a butadiene skeleton and the rubber with an isoprene skeleton have the same amount, vulcanization reversion is likely to occur, resulting in E* Decrease and increase in tanδ

[0005] Therefore, in order to suppress vulcanization reversion, it is necessary to mix styrene-butadiene rubber in the diene rubber component. However, styrene-butadiene rubber contains reinforcing materials such as carbon black and silica with low reinforcing properties. Using fillers, or containing only a small amount of reinforcing fillers, cannot sufficiently reduce tanδ

[0006] In addition, when the rubber composition for base treads disclosed in Japanese Patent Laid-Open No. 2006-124503 is applied to sidewalls, clinch portions, and separators, it has the advantages of achieving both low heat generation and elongation at break (durability). room for improvement

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