Removal of metal contaminants from polyethylene

Details Removal of metal contaminants from polyethylene Removal of metal contaminants from polyethylene

2007-12-17

2009-12-29

Caldarola, Glenn A (Department: 1797)

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Treating polymer containing material or treating a solid...

C528S480000, C528S481000, C528S491000, C528S493000, C528S496000

Reexamination Certificate

active

07638597

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.

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