Method of purifying a dispersion of ionic fluoropolymer

US7304101B2 · kind B2 · utility

Assignee

• 3M INNOVATIVE PROPERTIES COMPANY · US

Inventors

• Klaus Hintzer · Woodbury, US
• Kai H. Lochhaas · Neuötting, DE
• Tanja Zeif · Fridolfing, DE
• Steven J. Hamrock · Saint Paul, US
• Harold Todd Freemyer · Woodbury, US

Key dates

• Filing date: Jul 19, 2004
• Grant date: Dec 4, 2007
• Expiry date: Jul 22, 2025

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y02E60/50
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

Anionic species are removed from aqueous dispersions of ionic fluoropolymers using anion exchange resins. In some embodiments, cationic species are also removed using cation exchange resins.