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

摘要

PROBLEM TO BE SOLVED: To overcome a problem of deteriorating strength of a tire by blending a large amount of a recycled rubber because it is contaminant in the tire, especially a concern that effects by blending the recycled rubber become large because a bead insulation rubber has small amount of the rubber amount among tires, where an insulation rubber is required to be high hardness and high viscosity of an unvulcanized rubber, on the other hand use of the recycled rubber is desired from the viewpoint of reducing environmental load.SOLUTION: The above mentioned problem is solved by a rubber composition for tire bead insulation containing 100 pts.mass of diene rubber containing natural rubber of 60 pts.mass of more, 80 pts.mass of carbon black and 40 pts.mass of an inorganic filler with the total of carbon black and inorganic filler of 120 to 180 pts.mass and recycled rubber with 60 to 160 mesh of 4 to 50 mass% based on the inorganic filler.SELECTED DRAWING: None