Modified liquid diene polymers and rubber additives

Abstract

This invention relates to a modified liquid diene polymer having the modifying group shown in formula (I). [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.]