| 摘要 |
A process for polymerizing or copolymerizing olefins, which comprises polymerizing or copolymerizing olefins in the presence of a catalyst composed of (A) a solid titanium catalyst component obtained by reacting (i) a titanium composition composed essentially of tetravalent titanium, magnesium, halogen and an electron donor or electron donor residue selected from the group consisting of organic acid esters, alkoxy groups and aryloxy groups with (ii) an organic silicon compound having an Si-O-C bond in the molecule in the presence of (iii) an organoaluminum compound, or by first treating the titanium composition (i) with the organoaluminum compound (iii) and then reacting it with the organic silicon compound (ii), until the amount of the electron donor or electron donor residue in the titanium composition (i) decreases from that before the reaction, thus including a part of the silicon compound in the titanium composition, and; (B) an organoaluminum compound.
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