Patent ID: 9611381
Date: 2017-04-04
CPC Classifications: B60C,C08J,C08K,C08L

Claim:
1. A method for producing a rubber composition, the rubber composition including 100 parts by mass of a rubber component, from 20 to 150 parts by mass of silica, and from 1 to 10 parts by mass of a polymer gel which is crosslinked diene polymer particles, wherein from 30 to 90 parts by mass of at least one modified diene rubber selected from the group consisting of a styrene-butadiene rubber, a butadiene rubber, and a natural rubber, each having introduced therein at least one functional group selected from the group consisting of a hydroxyl group, an amino group, a carboxyl group, an alkoxyl group, and an epoxy group, and from 70 to 10 parts by mass of an unmodified diene rubber are used as 100 parts by mass of the rubber component, a polymer gel having a glass transition temperature of from −40 to −10° C. and having at least one functional group selected from the group consisting of a hydroxyl group, an amino group, a carboxyl group, an alkoxyl group, and an epoxy group is used as the polymer gel, and the method comprises a first step of mixing the entire amount of the modified diene rubber with the polymer gel together with the silica to obtain a first mixture, and a second step of mixing the unmodified diene rubber with the first mixture obtained.