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US 6,306,986 B1Granted
Polymerization of olefins
AssigneeE. I. Du Pont de Nemours and Company
InventorMark F Teasley
Life of this patent
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Abstract
Certain alkylhaloaluminoxanes and other alkylhaloaluminum compounds, when used as cocatalysts for the polymerization of olefins with complexes of transition metals and neutral bidentate ligands give good yields of polyolefin when using less of the alkylhaloaluminoxane than other types of aluminum compounds.
Claims18
A process for the polymerization of an olefin or olefins comprising the step of contacting, under polymerizing conditions:
- (a) a transition metal polymerization catalyst wherein a metal of Groups 3 through 10 is complexed to a neutral bidentate ligand,
- (b) an alkylaluminum cocatalyst, and
- (c) at least one monoolefin or nonconjugated diolefin capable of being polymerized thereby,
- wherein the alkylaluminum cocatalyst comprises a compound of the formula R1aXbAlOd, wherein:
- a and b are each independently about 0.50 to about 1.50, and d is 0.5 to 1.0, both provided that a+b+d is 2.0-2.5;
- each R1 is independently hydrocarbyl or substituted hydrocarbyl;
- and
- X is carboxylate, fluoride, chloride, bromide or iodide.
5 more elements
A process for the polymerization of ethylene comprising the step of contacting, under polymerizing conditions:
- (a) a transition metal polymerization catalyst wherein a metal of Groups 3 through 10 is complexed to a neutral bidentate ligand;
- (b) an alkylaluminum cocatalyst;
- and
- (c) ethylene,
- wherein the alkylaluminum cocatalyst comprises a compound of the formula R60qAlZt, wherein:
- q and t are each independently about 0.50 to about 2.50, provided that q+t is about 3.0;
- each R60 is independently hydrocarbyl or substituted hydrocarbyl;
- and
- Z is fluoride, chloride, bromide or iodide;
- and further provided that the molar ratio of aluminum in R60qAlZt to the transition metal in said transition metal polymerization catalyst is 75 to 500.
7 more elements
Dependencies are inferred from the claim text.