Aqueous dispersions of fluoropolymers

US7358296B2 · kind B2 · utility

Assignee

• 3M INNOVATIVE PROPERTIES COMPANY · US

Inventors

• Hermann Bladel · Emmerting, DE
• Klaus Hintzer · Woodbury, US
• Gernot Lohr · Altötting, DE
• Werner Schwertfeger · Altötting, DE
• Reinhard A. Sulzbach · Burghausen, DE

Key dates

• Filing date: Oct 21, 2004
• Grant date: Apr 15, 2008
• Expiry date: Jul 11, 2025

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08J2327/12
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

Fluorine-containing emulsifiers can be removed from fluoropolymer dispersions by adding to the dispersion a non ionic emulsifier, removing the fluorine-containing emulsifier by contact with an anion exchanger and separating the dispersion from the anion exchanger. The resulting dispersions can be concentrated and used for coating applications.