| 摘要 |
A process for producing olefin polymers, which comprises polymerizing or copolymerizing olefins in the presence of a catalyst comprising a solid catalyst component and an organoaluminum compound, said solid catalyst component being a titanium compound and/or a vanadium compound supported on a solid product obtained by the reaction between a Grignard compound and a boron compound represented by the general formula B(OR1)aR2bR3c, wherein a, b and c are numbers defined by the formulas 0<a</=3, 0</=b<3, 0</=c<3 and a+b+c=3, R1 represents a hydrocarbon radical having 1 to 20 carbon atoms, and R2 and R3, which may be the same or different, represent each a hydrogen atom, a hydrocarbon radical having 1 to 20 carbon atoms, or a halogen atom.
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