| abstract |
A method for producing a conjugated diene polymer having a high 1,4-cis structure content using a catalyst containing an yttrium compound with high efficiency is provided. SOLUTION: A conjugated diene is produced using a catalyst obtained from (A) an yttrium compound, (B) an ionic compound comprising a non-coordinating anion and a cation, (C) an organoaluminum compound, and (D) cyclopentadiene. A method for producing a conjugated diene polymer comprising polymerizing. [Effect] A conjugated diene polymer can be obtained with high efficiency without reducing the content of 1,4-cis structure even at a high polymerization temperature. [Selection figure] None |