Patent ID: 8389612
Filing Date: 2013-03-05
Classification: B60C,C08K,C08L

Abstract:
1. A rubber composition for cap tread comprising 0.5 to 10 parts by mass of an alkylphenol-sulfur chloride condensate (B) indicated by the formula (B1): wherein R 1 to R 3 are same or different, and either is an alkyl group having 5 to 12 carbons; x and y are same or different, and either is an integer of 2 to 4; and n is an integer of 0 to 10, 0 to 0.45 parts by mass of sulfur (C), 10 to 100 parts by mass of silica (D), and 5 to 12 parts by mass of at least one silane coupling agent selected from the group consisting of bis(3-triethoxysilylpropyl)disulfide and mercapt series silane coupling agents based on 100 parts by mass of silica (D), based on 100 parts by mass of a rubber component (A) comprising 30 to 80% by mass of a modified styrene-butadiene rubber having a primary amino group and/or an alkoxysilyl group and 20 to 70% by mass of at least one diene rubber selected from a group consisting of a natural rubber, an isoprene rubber, a butadiene rubber, a tin-modified butadiene rubber and a polybutadiene rubber comprising 1,2-syndiotactic crystals.