| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a rubber composition excellent in fatigue resistance, extrusion processability, and low heat generation. <P>SOLUTION: The rubber composition contains ≥10 wt% of a polybutadiene containing (1) a cis-1,4-structure content of ≥85% and (2) a 1,2-structure content of ≥6% and <10% is obtained by polymerizing 1,3-butadiene using a catalyst comprising (A) a yttrium compound, (B) an ionic compound comprising a non-coordinative anion and cation, (C) an organoaluminum compound, and a specific cyclic conjugated diene compound. <P>COPYRIGHT: (C)2013,JPO&INPIT |
