Patent ID: 9012540
Filing Date: 2015-04-21
Classification: B60C,C08K,C08L,Y02T

Abstract:
1. A rubber composition for a tire tread comprising: a modified diene rubber comprising a styrene butadiene rubber and/or a polybutadiene rubber, having at least one functional group selected from the group consisting of an amino group, a hydroxyl group, an epoxy group, an alkylsilyl group, an alkoxysilyl group and a carboxyl group; silica; a silane coupling agent; a lignin derivative; and a carbon masterbatch; wherein the carbon masterbatch comprises a styrene butadiene rubber and carbon black having iodine absorption of from 60 to 130 g/kg; ratio (B/A) of the amount (B) of the styrene butadiene rubber in the carbon masterbatch to the amount (A) of the modified diene rubber is from 0.25 to 1 in mass ratio; the total amount of the carbon black and the silica contained in the rubber composition is from 40 to 100 parts by mass per 100 parts by mass of a rubber component, and the proportion of the silica in the total amount of the carbon black and the silica is from 25 to 80% by mass; and the amount of the lignin derivative is from 0.1 to 10 parts by mass per 100 parts by mass of the rubber component.