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

A rubber composition for carcass plies and/or belts which comprises a rubber component comprising 30 to 90% by weight of natural rubber and 10 to 70% by weight of an epoxidized natural rubber and a filler comprising at least 80% by weight of silica and which is freed from the problems of concern for the environment and future reduction in petroleum supply and exhibits adhesiveness not inferior to that of a rubber composition containing a raw material resulting from petroleum as the main component; carcass plies and/or belts made by using the composition; and a process for the production of the composition. It is preferable that the process comprise the step (1) of kneading natural rubber and silica together and the step (2) of kneading the kneaded mixture discharged from the step (1) and an epoxidized natural rubber together.