RUBBER COMPOSITION FOR TIRE BEAD INSULATION AND PNEUMATIC TIRE USING THE SAME

摘要

PROBLEM TO BE SOLVED: To achieve both of low rolling resistance and reinforcement performance sufficiently while maintaining low viscosity of an unvulcanized rubber, which is difficult with a method of blending silica, blending carbon black with large particle diameter, reducing the blended amount of carbon black or the like for satisfying desire of low rolling resistance of the tire for reducing environmental load recently.SOLUTION: The above described problem is solved by a rubber composition for tire bead insulation by blending 100 pts.mass of a diene rubber containing a natural rubber of 30 pts.mass or more, 80 to 150 pts.mass of carbon black having nitrogen adsorption specific area (NSA) of 50 m/g or less and 0.1 to 10 pts.mass of a compound having a structure of a quinone compound and sulfonic acid or salts hereof in a molecule and/or a compound having the structure of the quinone compound and thiosulfuric acid or salts thereof in a molecule with the total of fillers of 160 to 220 pts.mass.SELECTED DRAWING: None