Patent ID: 7615591
Filing Date: 2009-11-10
Classification: B60C,C08K,Y10S

Abstract:
1. A rubber composition for a high-speed running tire comprising a diene rubber component, a filler and a softening agent, in which 190-350 parts by mass of a filler is compounded based on 100 parts by mass of a diene rubber component, and a softening agent is included in an amount of not less than 70% by mass per the filler, and not less than 60% by mass of the diene rubber component is a solution-polymerized styrene-butadiene copolymer rubber having a mass average molecular weight of not less than 1,000,000, and the filler comprises, based on 100 parts by mass of a diene rubber component, 10-30 parts by mass of carbon black, 170-300 parts by mass of silica and 10-80 parts by mass of an inorganic agent represented by the following general formula (I): (wherein M is at least one metal selected from the group consisting of aluminum, magnesium, titanium and calcium, or an oxide of such a metal or a hydroxide of such a metal, m is a number of 1-5, x is a number of 0-10, y is a number of 2-5 and z is a number of 0-10), wherein each of the filler and the softening agent is charged in at least two fractions when the diene rubber component is mixed with the filler and the softening agent.