Process for producing polyolefins
AssigneePhillips Petroleum Company
InventorsJoseph J. Bergmeister, Scott E. Kufeld, Max P. McDaniel
Life of this patent
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Abstract
A process is provided to produce polyolefins having a multimodal molecular weight distribution at the molecular level by contacting at least one mono-1-olefin in a polymerization zone, under polymerization conditions, with two different types of supported chromium catalyst systems. The first catalyst system comprises a chromium oxide catalyst system which comprises chromium oxide supported on an inorganic oxide. The second catalyst system comprises a chromocene catalyst system which comprises chromocene supported on an inorganic oxide. The resultant, recovered polymer has a multimodal, or at least a bimodal, molecular weight distribution.
Claims24
A process of producing polyolefins having a multimodal molecular weight distribution comprising polymerizing under polymerization conditions in a polymerization zone at least one olefin in the presence of a dual catalyst system comprising:
- a) a chromocene catalyst system comprising chromocene supported on an aluminophosphate support;
- and
- b) a chromium oxide catalyst system comprising chromium oxide supported on an inorganic oxide support;
- and
- recovering a polymer.
A process for producing polyolefins having a multimodal molecular weight distribution consisting essentially of polymerizing under polymerization conditions in a polymerization zone at least one olefin in the presence of a dual catalyst system comprising:
- a) a chromocene catalyst system comprising chromocene supported on an aluminophosphate support;
- and
- b) a chromium oxide catalyst system comprising chromium oxide supported on an inorganic oxide support;
- and
- recovering of polymer.
Dependencies are inferred from the claim text.