| 摘要 |
PROBLEM TO BE SOLVED: To provide a novel conjugated diene type (co)polymer (rubber) composition being excellent in various characteristics such as wearability and heat build-up. SOLUTION: A novel conjugated diene type (co)polymer (rubber) composition comprises (I) a modified high cis conjugated diene type (co)polymer prepared by modifying a high cis conjugated diene type (co)polymer, in which an active metal is contained in its molecular structure, a molecular weight distribution (Mw/Mn) is 2.1 or below, and a cis-bonding conjugated diene unite is at least 40%, with at least one modifier selected from the group consisting of compounds having linkages represented by formula I:>C=Q (wherein Q is an oxygen atom or sulfur atom) and formula II:>C=N-, and (II) a reinforcer.
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