Aqueous emulsion polymerization in the presence of ethers as chain transfer agents to produce fluoropolymers

US6861490B2 · kind B2 · utility

Assignee

• 3M INNOVATIVE PROPERTIES COMPANY · US

Inventors

• Harald Kaspar · Altötting, DE
• Klaus Hintzer · Woodbury, US
• Karl D. Weilandt · Minneapolis, US
• Jost Krichel · Neuötting, DE
• Erik Peters · Garching bei München, DE
• Lisa P. Chen · Okabena, US

Key dates

• Filing date: Jun 14, 2004
• Grant date: Mar 1, 2005
• Expiry date: Jun 14, 2024

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08F216/1408
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

The present invention provides a method of making a fluoropolymer comprising repeating units derived from one or more gaseous fluorinated monomers. The method comprises an aqueous emulsion polymerization of gaseous fluorinated monomers in the presence of an ether selected from the group consisting of dimethyl ether (DME), methyl tertiary butyl ether (MTBE) and mixtures thereof.