Method of making a ziegler-natta catalyst
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United States of America Patent
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Jul 4, 2006
Grant Date -
Mar 2, 2006
app pub date -
Aug 25, 2004
filing date -
Aug 25, 2004
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Abstract
A method for making a Ziegler-Natta catalyst support includes the steps of contacting a fumed silica with a surface modifying agent such as a compound having the formula RMgX MgR'R'' wherein R, R' and R'' are each individually a moiety selected from an alkyl group, cycloalkyl, aryl or alkaryl group, and X is a halogen selected from the group consisting of chlorine, bromine and iodine, to provide a pretreated silica seeding agent. The pretreated silica seeding agent is then dispersed in a non-aqueous liquid magnesium halide/alkanol complex, and the magnesium halide is crystallized onto the silica particles to form catalyst support particles especially suitable for Ziegler-Natta catalysts.
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