| abstract |
The present invention provides a composite carrier, the composite carrier contacting magnesium halide with one or more electron donating compounds to form a solution, mixing the solution with a silica material having an average particle diameter of less than 10 microns, and spray drying It is a spherical particle obtained. The present invention also provides a catalyst component produced using the composite carrier. When used with the promoter component in propylene polymerization, the catalyst component exhibits high polymerization activity and stereospecificity and can be used to produce high impact ethylene-propylene copolymers with high ethylene content. |