Rubber components and tire rubber components

Abstract

This invention relates to a rubber composition comprising 100 parts by mass of solid rubber (A), 5 to 30 parts by mass of a modified liquid diene polymer having a modified group as shown in formula (I) (B), and 30 to 150 parts by mass of filler (C). [In the formula, X represents N, O, or S; R1 represents a divalent hydrocarbon group; R2 represents a monovalent hydrocarbon group; R3 represents a divalent organic group containing O and C; R4 represents a hydrogen atom or an alkyl group; m represents an integer from 0 to 2; n represents an integer from 1 to 3, but m+n=3; * represents a bond.]