| 摘要 |
A polymerization catalyst composition that enables efficient synthesis of high molecular weight polyisoprene under industrial conditions without excessive gelation is provided. The polymerization catalyst composition includes: Component (A): a rare earth element compound of formula (i): M-(NQ 1 )(NQ 2 )(NQ 3 ) (where M is at least one selected from lanthanoid, scandium, and yttrium, and NQ 1 , NQ 2 and NQ 3 are amide groups that are the same or different and each have a M-N bond; Component (B): a hydrocarbyl aluminoxane compound having a C1-20 hydrocarbon group; and Component (C): a compound of formula (X): YR 1 a R 2 b R 3 c (where Y is a metal selected from groups 1,2, 12 and 13 in a periodic table, R 1 and R 2 are C1-10 hydrocarbon groups or hydrogen atoms and R 3 is a C1-10 hydrocarbon group where R 1 , R 2 and R 3 are the same or different, and a=1, b=0 and c=0 in the case where Y is the metal selected from the group 1 in the periodic table, a=1, b=1 and c=0 in the case where Y is the metal selected from the groups 2 and 12 in the periodic table, and a=1, b=1 and c=1 in the case where Y is the metal selected from the group 13 in the periodic table). |
