Aqueous dispersions of polytetrafluoroethylene particles

US7342066B2 · kind B2 · utility

Assignee

• 3M INNOVATIVE PROPERTIES COMPANY · US

Inventors

• Michael C. Dadalas · Eggenfelden, DE
• Klaus Hintzer · Woodbury, US
• Gernot Loehr · Altötting, DE
• Tilman C. Zipplies · Burghausen, DE

Key dates

• Filing date: Oct 4, 2004
• Grant date: Mar 11, 2008
• Expiry date: Aug 23, 2025

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C09D127/18
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

The present invention provides an aqueous non-melt processible polytetrafluoroethylene dispersion comprising non-melt processible polytetrafluoroethylene particles in an amount between 30 and 70% by weight based on the total weight of the dispersion and one or more non-ionic surfactants and wherein at least a part of said non-melt processible polytetrafluoroethylene particles comprise polytetrafluoroethylene polymer chains having repeating units comprising ionic groups. The invention further provides a method for obtaining the dispersions.