Process for removing vanadium catalyst residues from polymer solutions
CA 1070050 A · Owner: E.I. Du Pont De Nemours And Company · Inventors: Citron, Joel D.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
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 precipitated thereby. The process can be carried out continuously by passing the polymer solution through a column containing the active metal.
Read the whole patent
Listed from its CIPO record in Patent Yard's archive of Canadian patents past their term. Its claims, description and drawings are in the CIPO record and on Google Patents, and the Claude kit works from them.
Why it's free to use
- Granted January 15, 1980. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended January 15, 1997.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
Timeline
Timeline From CIPO dates
Sources & verification
Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.