Removal of metal contaminants from polyethylene
AssigneeEquistar Chemicals, LP
InventorsBradley P. Etherton, Marvin R. Appel
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Abstract
A process to remove metal contaminants from a hydrocarbon solution of polyethylene is disclosed. The process comprises adding a primary alcohol and a β-diketone to a solution of polyethylene at a temperature within the range of 120° C. to 300° C. and contacting the solution with basic alumina. The process removes metal contaminants and minimizes degradation and condensation products, which can have a detrimental effect on polyethylene properties. The process provides polyethylene with low metal residues and good properties.
Claims11
A process to remove metal contaminants from a hydrocarbon solution of polyethylene, which comprises adding a primary alcohol and a β-diketone to a solution of polyethylene at a temperature within the range of 120° C. to 300° C. and contacting the solution with basic alumina wherein the molar ratio of β-diketone to primary alcohol is from 1:1 to 5:1.
A process which comprises polymerizing ethylene in a hydrocarbon solvent with a transition metal catalyst at a temperature within the range of 120° C. to 300° C.;
- adding a primary alcohol and a β-diketone;
- and contacting the solution with basic alumina wherein the molar ratio of β-diketone to primary alcohol is from 1:1 to 5:1.
Dependencies are inferred from the claim text.