Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Treating polymer containing material or treating a solid...
Patent
1975-02-28
1976-06-08
Levin, Stanford M.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Treating polymer containing material or treating a solid...
528488, 526 90, 526339, 526350, C08F 608
Patent
active
039621995
ABSTRACT:
Removal of dissolved vanadium catalyst residues from .alpha.-olefin polymer solutions improves the heat stability of the polymer recovered therefrom. Vanadium residues are removed from .alpha.-olefin polymer solutions in inert solvents by contacting the solutions at 50.degree.-225.degree.C. with one or more active metals, either in their elemental form or as alloys, selected from alkali metals, aluminum, and zinc, and separating the solutions from vanadium residues precipitated thereby. The process can be carried out continuously by passing the polymer solution through a column containing the active metal.
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E. I. Du Pont de Nemours and Company
Levin Stanford M.
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