Rubber composition for tire
AssigneeSumitomo Rubber Industries, Ltd.
InventorTatsuya MIYAZAKI
Life of this patent
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Abstract
A rubber composition for a tire superior in low heat build-up (tan δ) and superior in fracture strength is provided. A rubber composition for a tire comprising (B) 5 to 80 parts by mass of silica based on 100 parts by mass of (A) including (a) 10 to 60% by mass of a butadiene rubber including 2.5 to 20% by mass of 1,2-syndiotactic polybutadiene crystals, (b) 5 to 60% by mass of a modified diene rubber and (c) 20 to 75% by mass of a diene rubber other than (a) and (b).
Claims4
A rubber composition for a tire comprising (B) 5 to 80 parts by mass of silica based on 100 parts by mass of (A) including (a) 10 to 60% by mass of a butadiene rubber including 2.5 to 20% by mass of 1,2-syndiotactic polybutadiene crystals, (b) 5 to 60% by mass of a modified diene rubber whose terminal is modified with a compound represented by the formula (1):
- (Wherein R1, R2 and R3 are same or different and are an alkyl group, an alkoxyl group, an acetal group, a carboxyl group, a mercapto group or a derivative thereof, R4 and R5 are same or different and are an alkyl group or a hydrogen atom and n is an integer.) and (c) 20 to 75% by mass of a diene rubber other than (a) and (b).
Dependencies are inferred from the claim text.