Process for manufacturing clean fluoropolymers

US8541499B2 · kind B2 · utility

Assignee

• 3M INNOVATIVE PROPERTIES COMPANY · US

Inventors

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

Key dates

• Filing date: Oct 10, 2008
• Grant date: Sep 24, 2013
• Expiry date: Mar 2, 2029

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08K5/095
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

There is provided a fluoroelastomer characterized by containing one type or more types of fluorinated emulsifiers represented by the formula: F—(CF2)t-[O(CF2)n]m-O—(CHF)o-(CF2)p-X where m=0 to 3; n=1 to 5; o=0 to 1; p=1 to 3; t=1 to 10; and where when t=2 than o≠0; and further where X is selected from a group consisting of a carboxyl acid group and a salt of a carboxylic acid group. A method for preparing fluoroelastomers by using such fluorinated emulsifiers in emulsion polymerization of fluoromonomers and articles containing such fluoroelastomers are also provided. A fluorinated elastomer dispersion including an aqueous mixture of a crosslinkable fluorinated elastomer and such fluorinated emulsifiers are also provided. The fluoroelastomers created with such fluorinated emulsifiers are essentially free of cations other than NH4+ and H+ and have a low glass transition temperature.