| 摘要 |
A polymerization catalyst comprising a reaction product of an organic rare earth metal compound of the formula (I), CpaLxbMcDd (I) (wherein in the formula (I), Cp is a substituted or unsubstituted cyclopentadienyl group, indenyl group, fluorenyl group or their derivatives, or a multidentate coordination compound residue obtained by bonding these groups by way of hydrocarbon or silicon, L is a metal selected from the group consisting of elements having an atomic number of 39 and 57-71, X is a halogen atom, M is an alkaline metal or alkaline earth metal, D is an electron donor, a is 1-2, b is 1-2, c is 0-1, and d is 0-3) with a Grignard reagent of the formula (II), RMgX (II) wherein in the formula (II), R is a hydrocarbon group, and X is a halogen atom); a method for producing a polyolefin or an olefin block copolymer by using the above-mentioned catalyst; and an olefin block copolymer produced by the above-mentioned method.
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