| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a rubber composition excellent in wear resistance, extrusion processability, and low loss property. <P>SOLUTION: The rubber composition contains≥10 wt% of a polybutadiene having (1) a cis-1,4-structure content of≥85% and (2) a 1,2-structure content of≥2% and <6% 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 (D) a specific cyclic conjugated diene compound. <P>COPYRIGHT: (C)2013,JPO&INPIT</p> |
