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AssigneeQuantum Chemical Corporation
InventorsStanley J. Katzen, Thomas J. Pullukat, Michael W. Lynch, Louis J. Rekers
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Mixed catalyst compositions comprised of a first supported chromium-containing catalyst component and a second supported chromium-containing catalyst component and which additionally have one or more metallic or non-metallic catalytic agents associated therewith are provided. The additional metallic or non-metallic elements associated with the catalyst components can be aluminum, titanium, zirconium, boron, phosphorous or combinations thereof. The pore volume of the silica supports used for the first and second catalyst components differs by at least 0.3 cc/g. The mixed catalyst compositions of the invention are useful for the preparation of polyolefins. They are particularly useful of polymerization of ethylene in particle form polymerizations to produce high density polyethylene blow molding resins having good processability and physical properties. The improved particle form polymerization process and products obtained thereby using the above-described mixed catalyst compositions are also described.
In a process for the particle form polymerization of ethylene, to produce high density resins useful for blow molding having broadened molecular weight distributions, the improvement comprising conducting the polymerization in the presence of a mixed catalyst consisting essentially of first and second silica-supported chromium catalyst components present at a weight ratio from 10:1 to 1:10 and each component containing from 0.1 to 2.0 weight percent chromium and thermally activated by heating in a non-reducing atmosphere at a temperature from 450.degree. F. to 1700.degree. F.;
Dependencies are inferred from the claim text.