Effect of aluminophosphate on catalyst systems comprising metal alkyl cocatalysts
AssigneePhillips Petroleum Company
InventorsNancy W. Eilerts, Max P. McDaniel, Lloyd W. Guatney, Kathy S. Collins
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Abstract
Novel catalyst systems which comprise one or more diimine nickel (II) or palladium (II) complexes, one or more cocatalysts, and aluminophosphate are disclosed. Olefin polymerization processes using those catalyst systems are also disclosed. The inclusion of aluminophosphate can improve the activity or productivity of such catalyst systems, making such catalyst systems active or more active in olefin polymerization under conditions in which they had previously been inactive or insufficiently active.
Claims12
A process for producing polyolefins comprising contacting at least one olefin in a polymerization zone under polymerization conditions with a catalyst composition produced by combining at least one diimine complex, an aluminophosphate, and at least one cocatalyst selected from the group consisting of alkyl aluminum compounds and alkyl zinc compounds, wherein the diimine complex, aluminophosphate, and cocatalyst are present in such amounts that the catalyst composition is more active than a catalyst composition having the same amounts of the diimine complex and the cocatalyst but no aluminophosphate, and wherein each diimine complex is selected from the group consisting of nickel and palladium diimine complexes having
- functionality, wherein M is Ni or Pd and each R can be the same or different and is selected from the group consisting of hydrogen and branched or linear alkyl groups or aromatic groups, said alkyl and aromatic groups having 1 to 10 carbon atoms.
Dependencies are inferred from the claim text.