Propylene polymerization process with enhanced catalyst activity
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United States of America Patent
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Oct 7, 2003
Grant Date -
N/A
app pub date -
Apr 18, 2002
filing date -
Apr 18, 2002
priority date (Note) -
Expired
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Abstract
A process for polymerizing propylene is disclosed. The process involves charging propylene and about 90 to 99% of an organoaluminum cocatalyst to a reactor and heating this mixture to at least about 50.degree. C. This is followed by addition of a premix of 1 to 10% of the organoaluminum cocatalyst with a magnesium halide-supported Ziegler-Natta catalyst. The temperature of the reaction mixture is maintained to produce a propylene polymer. The process gives improved catalyst activity.
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