The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 23, 2010
Filed:
Dec. 02, 2005
James R. Combes, Longmont, CO (US);
David William Johnson, Washington, WV (US);
Stephen Thomas Breske, Wilmington, DE (US);
James R. Combes, Longmont, CO (US);
David William Johnson, Washington, WV (US);
Stephen Thomas Breske, Wilmington, DE (US);
E.I. du Pont de Nemours and Company, Wilmington, DE (US);
Abstract
A process for reducing fluorosurfactant content of a stabilized fluorosurfactant-containing aqueous fluoropolymer dispersion comprising contacting the stabilized fluorosurfactant-containing aqueous fluoropolymer dispersion with an anion exchange resin comprising a polymer and quaternary ammonium functional groups to reduce fluorosurfactant content, the functional groups being resistant to degradation which releases trialkylamines. The anion exchange resin is separated from the dispersion after the fluorosurfactant content has been reduced.