| 摘要 |
PROBLEM TO BE SOLVED: To provide a copolymer capable of providing a rubber composition and a pneumatic tire well balancedly improved in low fuel consumption and wet grip performance.SOLUTION: A copolymer is obtained by reacting active terminals of a conjugated diene compound and a copolymer obtained by polymerizing a compound represented by formula (II) with a specific compound by using a polymerization initiator represented by formula (I), and has a weight-average molecular weight Mw of 1.0×10to 2.5×10. |
