Tetrafluoroethylene polymer dispersions stabilized with aliphatic non-ionic surfactants

US11193037B2 · kind B2 · utility

Assignee

• 3M INNOVATIVE PROPERTIES COMPANY · US

Inventors

• Michael C. Dadalas · Eggenfelden, DE
• Klaus Hintzer · Woodbury, US
• Arnd Kurz · Neuss, DE
• Tilman C. Zipplies · Burghausen, DE
• Kai H. Lochhaas · Neuötting, DE

Key dates

• Filing date: Jan 29, 2015
• Grant date: Dec 7, 2021
• Expiry date: Sep 22, 2036

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T428/31544
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

An aqueous dispersion comprising a tetrafluoroethylene core-shell polymer and at least one surfactant corresponding to the general formula R10-[CH2CH20]n[R20]m-R3 wherein R1 represents a linear or branched aliphatic hydrocarbon group having at least 8 carbon atoms, preferably 8 to 18 carbon atoms, R2 represents an alkylene having 3 carbon atoms, R3 represents hydrogen, a C1-C3 alkyl group, or a C1-C3 hydroxyalkyl group, n has a value of 0 to 40, m has a value of 0 to 40 and the sum of n+m is at least 2, wherein the dispersion is free of fluorinated emulsifiers or contains them in an amount of less than 50 ppm based on the weight of the dispersion and wherein the core-shell polymer contains an outer shell of tetrafluoroethylene homopolymer. Further provided are methods of making the dispersions, coating compositions comprising the dispersions and article coated by the coating composition.