Fluoropolymers with very low amounts of a fluorinated alkanoic acid or its salts

US12018105B2 · kind B2 · utility

Assignee

• 3M INNOVATIVE PROPERTIES COMPANY · US

Inventors

• Klaus Hintzer · Woodbury, US
• Florian D. Jochum · Neuötting, DE
• Herbert Koenigsmann · Altötting, DE
• Jens Schrooten · Mühldorf a. Inn, DE
• Tilman C. Zipplies · Burghausen, DE
• Karl D. Weilandt · Minneapolis, US

Key dates

• Filing date: May 8, 2019
• Grant date: Jun 25, 2024
• Expiry date: Oct 23, 2041

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08L27/18
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

Method of reducing the amount of a fluorinated acid or its salts from a fluoropolymer, the method comprises: (i) providing a composition containing particles of the fluoropolymer, (ii) contacting the fluoropolymer particles with a treatment composition comprising at least one organic liquid; and, optionally, further comprising (iii) isolating, washing and subjecting the fluoropolymer to drying treatment, and wherein the fluoropolymer contains units derived from tetrafluoroethene (TFE) and is selected from the group of fluoroelastomers and the group of fluoropolymers having a melting point of less than 150° C. Also provided are fluoropolymer and compositions containing such polymers that are essentially free of fluorinated acids and their salts.