| abstract |
The invention provides a catalyst component for olefin polymerization. The catalyst component is prepared by: mixing a magnesium compound, an organic alcohol compound and an inert solvent, and adding an precipitation assistant to obtain an alcohol adduct; contacting the alcohol adduct with a titanium compound solution, then adding an internal electron donor compound and allowing them to react, conducting filtration to separate solid particles; adding the solid particles into the titanium compound solution, carrying out stirring and allowing them to react, and conducting filtration to separate solid particles; washing the solid particles by the inert solvent, and performing drying. Specifically, a phosphorus-containing compound, which can be alkyl ester or halogenated alkyl ester of orthophosphoric acid or phosphorous acid, an alkyl or aryl phosphine compound or a mixture thereof, is added during the steps. And the phosphorus content of the catalyst component is 0.2-3.0wt%. When the catalyst is used for olefin polymerization, especially propylene polymerization, a polymer with a high isotactic index and a high melt flow rate can be obtained. |