Aqueous dispersions of fluoropolymers

US6833403B1 · kind B1 · 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: Aug 3, 2001
• Grant date: Dec 21, 2004
• Expiry date: Aug 3, 2021

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 nonionic 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.