| 摘要 |
A polyolefin is prepared by using a catalyst comprising a solid catalyst component and an organometallic compound, the solid catalyst component being prepared by reacting the following components ¢I!, ¢II! and ¢III!: ¢I! a reaction product obtained by the following components (1), (2) and (3) in the presence of a compound represented by the general formula R2OH wherein R2 is a hydrocarbon radical having 1 to 20 carbon atoms or an organic residue containing such an element as oxygen, nitrogen, sulfur, or chlorine: (1) a silicon oxide and/or an aluminum oxide; (2) a reaction product obtained by reacting a magnesium halide and a compound represented by the general formula ¢Me(OR)n X z-n! wherein Me represents an element of Groups I to IV in the Periodic Table, z represents the valence of the element Me, n is 0 < n ~ z, X is a halogen atom, and R is a hydrocarbon residue having 1 to 20 carbon atoms; and (3) a titanium compound represented by the general formula Ti(OR1)m X4-m wherein R1 is a hydrocarbon radical having 1 to 20 carbon atoms, X is a halogen atom, and m is 0 ~ m ~ 4; ¢II! an organoaluminum compound represented by the general formula Al(OR3)p R4q X3-(p+q), wherein R3 and R4, which may be the same or different, are each a hydrocarbon residue having 1 to 24 carbon atoms, X is a halogen atom or hydrogen atom, and p and q are 0 ~ p < 3, and 0 ~ q ~ 3, provided 0 < p+q ~ 3; and ¢III! a silicon compound represented by the general formula ¢R5a R6b R7c Si(OR8)d X4-(a+b+c+d)! where R5, R6, R7 and R8, which may be the same or different, are each a hydrocarbon residue having 1 to 20 carbon atoms, X is a halogen atom, and a, b, c and d are 0 ~ a < 4, 0 ~ b < 4, 0 ~ c < 4 and 0 < d ~ 4, provided 0 < a+b+c+d ~ 4.
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