| 摘要 |
PROBLEM TO BE SOLVED: To provide a copolymer capable of setting up such rubber composition and pneumatic tire that strike a balance well-balancedly between low-fuel consumption and wet grip performance.SOLUTION: This copolymer can be obtained by reaction of a compound having a specified functional group with a polymer active terminal obtainable by copolymerizing 1,3-butadiene and a specific aromatic compound or the 1,3-butadiene, an aromatic vinyl compound, and the specific aromatic compound, wherein its weight-average molecular weight (Mw) is 1.0×10to 2.5×10. |
