Method of preparing fluoropolymers by aqueous emulsion polymerization

US8623957B2 · kind B2 · utility

Assignee

• 3M INNOVATIVE PROPERTIES COMPANY · US

Inventors

• Klaus Hintzer · Woodbury, US
• Michael Juergens · Rheydt, DE
• Harald Kaspar · Altötting, DE
• Kai H. Lochhaas · Neuötting, DE
• André Streiter · Mühldorf a. Inn, DE
• Tilman C. Zipplies · Burghausen, DE
• Werner Schwertfeger · Altötting, DE

Key dates

• Filing date: Aug 15, 2008
• Grant date: Jan 7, 2014
• Expiry date: Jan 8, 2030

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08F14/26
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

Method of making fluoropolymers by emulsion polymerization of one or more fluorinated monomers in an aqueous phase in the presence of a fluorinated emulsifier, said method comprises adding a doping agent in a weight ratio with respect to the emulsifier of from about 1:2 to about 1:20, said doping agent has a melting point of equal or less than 30° C. and a boiling point of at least about 100° C. and is selected from the group consisting of fluorinated cyclic hydrocarbons, fluorinated polyoxyalkenes, fluorinated alkenes and fluorinated polyoxyalkenes.