Bead filler rubber composition

摘要

A bead filler rubber composition, comprising: (A) a resin forced rubber composition comprising vulcanizable rubber including 5 to 100 parts by weight, based on 100 parts by weight of the rubber, of fine short fibers of thermoplastic polymer having <IMAGE> groups buried therein, and the vulcanizable rubber and the thermoplastic polymer being grafted to each other through a phenol formaldehyde resin precondensate at an interface of the fiber; (B) a diene rubber; and (C) carbon black, wherein the following conditions (i) through (iv) are satisfied: (i) the amount of said thermoplastic polymer is 2 to 20 parts by weight based on 100 parts by weight of the total amount of the rubber constituents; (ii) the ratio of the rubber is such that the total amount of the natural rubber or polyisoprene in the component (A) and the component (B) is 100 to 55% by weight; (iii) the amount of the carbon black is 50 to 70 parts by weight on 100 parts by weight of the total amount of the rubber constituents; and (iv) the vulcanizate derived from the rubber composition has a 50% modulus of at least 30 kg/cm2.