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

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A polymerization catalyst composition that, without accompanying excessive gelation, allows efficient synthesis of high molecular weight polyisoprene under industrial conditions is provided. The polymerization catalyst composition contains : a rare earth element compound (component (A)) represented by the following general formula (i) : [in-line-formulae]M-(NQ1)(NQ2)(NQ3)  (i); [/in-line-formulae]at least one (component (B)) selected from an ionic compound and a halogen compound; anda compound (component (C)) represented by the following general formula (X) : [in-line-formulae]YR1aR2bR3c  (X).[/in-line-formulae]