abstract |
The invention belongs to the field of olefin polymerization, and relates to a catalyst for olefin polymerization and its application, an olefin polymerization method and a polymer. The catalyst contains: (i) a solid catalyst component; (ii) at least one aluminum alkyl compound; (iii) an external electron donor compound; wherein the solid catalyst component contains a magnesium source, a titanium source and an internal electron donor The internal electron donor contains a phosphate compound and a diether compound; the external electron donor compound contains a tetrahydrocarbyloxysilane compound and a dialkyloxysilane compound. The invention adopts the specific compound external electron donor compound to combine with the specific titanium-containing solid catalyst component, the catalyst has high stereospecificity, and the obtained polymer has a high isotactic index. |