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US 6,150,295 AGranted
Polymerization catalysts and processes therefor
AssigneePhillips Petroleum Company
InventorNancy W. Eilerts
Life of this patent
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Abstract
Novel catalyst systems which comprise pyridine-2-carboxaldimine nickel complexes can be used with methylaluminoxane in slurry polymerization processes to polymerize mono-1-olefins and, optionally a higher alpha-olefin comonomer, to produce low molecular weight polymers.
Claims7
A heterogeneous catalyst composition comprising:
- a) pyridine-2-carboxaldimine nickel complexes which further comprise additional ligands selected from the group consisting of .beta.-diketonates halogens and mixtures thereof having a formula of:
- ##STR2## wherein R' and R" can be the same or different and are selected from the group consisting of branched and/or linear alkyl or aromatic groups having from about 1 to about 10, carbon atoms per alkyl group and R' or R" can be in any position on the aromatic ring;
- and
- R can be the same or different and is selected from the group consisting of hydrogen and linear, branched, cyclic, bridging, aromatic, and/or aliphatic hydrocarbons, having from about 1 to about 70 carbon atoms per radical group;
- R'"CYCXCYR'" substituents can be the same or different and are selected from the group consisting of .alpha.-deprotonated-.beta.-diketones, in which R'" can be the same or different, .alpha.-deprotonated-.beta.-ketoesters, halogens and mixtures thereof;
- and
- Z is selected from the group consisting of fluorine, chlorine, bromine, iodine, and R'"CYCXCYR'", and
- b) methylaluminoxane.
5 more elements
Dependencies are inferred from the claim text.