Removing fluorosurfactant from aqueous fluoropolymer dispersions using anion exchange polymer with functional groups resistant to degradation to trialkylamines
AssigneeE.I. du Pont de Nemours and Company
InventorsJames Combes, David Johnson, Stephen Breske
Life of this patent
Estimating the term…
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.
Claims25
A process for reducing fluorosurfactant content of a stabilized fluorosurfactant-containing aqueous fluoropolymer dispersion comprising:
- contacting said stabilized fluorosurfactant-containing aqueous fluoropolymer dispersion with an anion exchange resin comprising a polymer and quaternary ammonium functional groups, said functional groups being resistant to degradation which releases trialkylamines;
- and
- separating said resin from said dispersion after the fluorosurfactant content has been reduced.
A process for reducing fluorosurfactant content of a stabilized fluorosurfactant-containing aqueous fluoropolymer dispersion comprising:
- contacting said stabilized fluorosurfactant-containing aqueous fluoropolymer dispersion with an anion exchange resin comprising a polymer and functional groups to reduce fluorosurfactant content, said functional groups comprising quaternary ammonium groups comprising a dimethyl hydroxyalkyl amine moiety;
- and
- separating said resin from said dispersion after the fluorosurfactant content has been reduced.
A process for reducing fluorosurfactant content of a stabilized fluorosurfactant-containing aqueous fluoropolymer dispersion comprising:
- contacting said stabilized fluorosurfactant-containing aqueous fluoropolymer dispersion with an anion exchange resin comprising a polymer and functional groups to reduce fluorosurfactant content, said functional groups comprising quaternary ammonium groups linked to said matrix by a C2 to C6 alkyl group;
- and
- separating said resin from said dispersion after the fluorosurfactant content has been reduced.
Dependencies are inferred from the claim text.