| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a copolymer that can provide a rubber composition and a pneumatic tire in which low fuel consumption and wet grip performance are improved in good balance. <P>SOLUTION: The copolymer is obtained by copolymerizing 1,3-butadiene and a compound represented by general formula (I), wherein at least one terminal of the copolymer is modified with a modifier having a functional group including at least one atom selected from the group consisting of nitrogen, oxygen and silicon, and the weight-average molecular weight Mw of the copolymer is 1.0×10<SP POS="POST">5</SP>to 2.5×10<SP POS="POST">6</SP>. In formula, R<SP POS="POST">1</SP>, R<SP POS="POST">2</SP>and R<SP POS="POST">3</SP>each represents an amino group or a hydrocarbon group, and at least one of them represents an amino group. <P>COPYRIGHT: (C)2012,JPO&INPIT |
