RUBBER COMPOSITION FOR CARCASS PLIES AND/OR BELTS, CARCASS PLIES AND/OR BELTS MADE BY USING THE SAME, AND PROCESS FOR PRODUCTION OF THE COMPOSITION

摘要

The present invention can provide the rubber composition for a carcass ply and/or a belt, which comprises a rubber component comprising 30 to 90 % by weight of a natural rubber and 10 to 70 % by weight of an epoxidized natural rubber and a filler containing not less than 80 % by weight of silica, has adhesion as favorably compared with a rubber composition mainly comprising raw materials derived from non-petroleum resources, and makes it possible to reduce an adverse effect on environment and provide for the future decrease of petroleum supply, the carcass ply and/or the belt using the same composition, and the preparation process of the same composition. It is preferable that the process for preparing the rubber composition for a carcass ply and/or a belt comprises a step (1) of kneading the natural rubber and silica and a step (2) of kneading the kneaded product discharged in the step (1) and the epoxidized natural rubber.