POLYMERIZATION CATALYST COMPOSITION, METHOD FOR PRODUCING SYNTHETIC POLYISOPRENE, AND SYNTHETIC PO

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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-(NQ1)(NQ2)(NQ3) (where M is at least one selected from lanthanoid, scandium, and yttrium, and NQ1, NQ2 and NQ3 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) : YR1aR2bR3c (where Y is a metal selected from groups 1, 2, 12 and 13 in a periodic table, R1 and R2 are C1-10 hydrocarbon groups or hydrogen atoms and R3 is a C1-10 hydrocarbon group where R1, R2 and R3 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).