Composite carrier of catalysts for propylene polymerization, a catalyst component and a catalyst comprising the same
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United States of America Patent
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Issued Date -
Nov 18, 2004
app pub date -
Feb 19, 2004
filing date -
Feb 24, 2003
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
The present invention is to provide a composite carrier, which is spheric particles obtainable by contacting magnesium halide with one or more electron donor compounds to form a solution, then mixing the solution with silica material having an average particle size of less than 10 microns to form a mixture, and drying the mixture through spray drying process. The present invention is also to provide a catalyst component comprising said composite carrier. When the catalyst component is used together with a cocatalyst component in propylene polymerization, it exhibits higher polymerization activity and stereospecificity, and can be used to prepare high impact resistant ethylene-propylene copolymer having high ethylene content.
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