Process for removing vanadium catalyst residues from polymer...

C - Chemistry – Metallurgy – 08 – F

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402/419, 402/585

C08F 6/08 (2006.01) C08F 6/02 (2006.01) C08F 10/02 (2006.01) C08F 210/18 (2006.01)

Patent

CA 1070050

ABSTRACT OF THE DISCLOSURE Removal of dissolved vanadium catalyst residues from ? -olefin polymer solutions improves the heat stability of the polymer recovered therefrom. Vanadium residues are removed from ?-olefin polymer solutions in inert solvents by contacting the solutions at 50-225°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 precipit- ated thereby. The process can be carried out continuously by passing the polymer solution through a column containing the active metal.

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