Perfluoroelastomers having a low glass transition temperature and method of making them

US6730760B2 · kind B2 · utility

Assignee

• 3M INNOVATIVE PROPERTIES COMPANY · US

Inventors

• Werner M. A. Grootaert · Windom, US
• Klaus Hintzer · Woodbury, US
• Franz März · Altötting, DE
• Guy Van Gool · Melsele, BE
• Allan T. Worm · Maplewood, US
• Erik D. Hare · Windom, US

Key dates

• Filing date: Dec 11, 2001
• Grant date: May 4, 2004
• Expiry date: Dec 11, 2021

Classification

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

Abstract

A method of making a curable fluoroelastomer is disclosed. The method comprises the steps ofpreemulsifying at least one perfluorovinylether in water, andcopolymerizing the preemulsified perfluorovinylether with a gaseous fluorinated monomer in the presence of a cure site monomer. The method provides a fluoroelastomer having a glass transition temperature of less than −10° C. Also disclosed is a fluoroelastomer that consists essentially of a perfluorovinylether of formula (I) as defined below, a cure site component, perfluoromethylvinylether, and tetrafluoroethylene and/or chlorotrifluoroethylene.