RARE EARTH METAL COMPLEX, POLYMERIZATION CATALYST AND METHOD FOR PRODUCING POLYMER

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Disclosed is a rare earth metal complex represented by the following formula (1). (1) (In the formula, A represents a group 14 element of the periodic table; Cp represent a substituted or unsubstituted group having a cyclopentadienyl type anion skeleton; Ln represents a group 3 metal atom or a lanthanoid metal atom; R1-R6 may be the same as or different from one another and represent a hydrogen atom, a halogen atom, an alkyl group having 1-20 carbon atoms, an aryl group having 6-20 carbon atoms, an aralkyl group having 7-20 carbon atoms, a silyl group substituted with a hydrocarbon group having 1-20 carbon atoms, an alkoxy group having 1-20 carbon atoms or the like; R7 represents an alkyl group having 1-20 carbon atoms, an aryl group having 6-20 carbon atoms or an aralkyl group having 7-20 carbon atoms; X represents a monoanionic ligand; Y represents a neutral ligand; m represents an integer of 1-3; and n represents an integer of 0-3.) For example, this rare earth metal complex is useful as a catalyst for olefin polymerization reactions. A polar monomer such as a lactone can be polymerized by using this rare earth metal complex as a catalyst.© KIPO & WIPO 2009