ISOPRENE POLYMERIZATION CATALYST COMPOSITION, METHOD FOR PRODUCING SYNTHETIC POLYISOPRENE, AND SYN

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A polymerization catalyst composition that enables efficient synthesis of high molecular weight polyisoprene is provided. An isoprene polymerization catalyst composition includes : Component (a) : a rare earth element compound having a rare earth element-oxygen bond or a rare earth element-sulfur bond; Component (b) : an ionic compound; and Component (c) : at least one compound selected from the group consisting of a compound of formula (X) : YR1aR2bR3c and a compound having a repeating unit of formula (Y) : (-Y(R1)O-) (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=o and c=o in the case where Y is the metal selected from the group 1 in the periodic table, a=1, b=1 and c=o 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).