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US 6,294,494 B1Granted
Olefin polymerization processes and products thereof
AssigneePhillips Petroleum Company
InventorsMax P. McDaniel, Elizabeth A. Benham
Life of this patent
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Abstract
A novel loop/slurry olefin polymerization process is provided which produces ultra-high molecular weight ethylene homopolymer.
Claims11
A polymerization catalyst system comprising a catalyst consisting essentially of zirconium halide impregnated onto a calcined alumina support and an aluminum alkyl cocatalyst;
- wherein said alumina has been calcined at a temperature of greater than about 300° C. prior to impregnation by the zirconium halide;
- wherein said zirconium halide is dissolved in an organic solvent and impregnated onto the calcined alumina;
- wherein said organic solvent is evaporated from the zirconium halide-impregnated alumina;
- and
- wherein said zirconium halide impregnated alumina is cured at a temperature of greater than about 200° C. in the absence of added hydrogen.
2 more elements
A polymerization catalyst system comprising a zirconium alkoxide impregnated onto an alumina support;
- wherein said zirconium alkoxide is dissolved in an inorganic solvent prior to impregnation onto an alumina support;
- wherein said inorganic solvent is evaporated;
- and
- wherein said zirconium alkoxide impregnated alumina is halided at an elevated temperature.
1 more element
A process to prepare a catalyst system comprising the steps of:
- a) contacting an alumina-containing support with a zirconium compound to form a catalyst component consisting essentially of alumina and zirconium,
- wherein said alumina-containing support has a surface area of greater than about 200 m2/g, and a pore volume of greater than about 0.5 ml/g after calcination;
- b) curing the catalyst component at a temperature of greater than about 250° C. in the absence of added hydrogen;
- and
- c) combining said cured catalyst component with an aluminum alkyl cocatalyst to form the catalyst system.
2 more elements
Dependencies are inferred from the claim text.