High activity olefin polymerization catalysts

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United States of America Patent

PATENT NO 6177375
SERIAL NO

09037138

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Abstract

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A method for preparing a silica supported, .alpha.-olefin polymerization catalyst includes the steps of treating a silica support with an organosilane compound, contacting the silylated silica support with a transition metal compound to form an intermediate, then contacting the resulting intermediate with an alkylmagnesium alkoxide to form the catalyst. The transition metal compound is either a metal chloride or a metal chloroalkoxide, and the transition metal is selected from titanium, vanadium, and zirconium. The alkylmagnesium alkoxide may be selected from butylethylmagnesium butoxide, butylethylmagnesium 2-ethylhexoxide, butyloctylmagnesium ethoxide, or butylmagnesium propoxide. The process steps may be carried out in the presence of an aliphatic organic solvent, such as heptane, with a slurry of solids in the solvent being formed during the process steps. Catalysts produced by this process, during which the alkylmagnesium alkoxide contacts the reacting components after the transition metal compound is applied, have higher activities when compared with catalysts prepared by known processes under similar conditions.

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Patent Owner(s)

Patent OwnerAddress
PQ CORPORATIONP O BOX 840 VALLEY FORGE PA 194820840

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Pullukat, Thomas J Lansdale, PA 33 527
Shinomoto, Ronald S Schwenksville, PA 8 324

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