The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 17, 2010
Filed:
Jul. 14, 2006
Klaus Hintzer, Kastl, DE;
Harald Kaspar, Burgkirchen, DE;
Andreas R. Maurer, Langenneufnach, DE;
Werner Schwertfeger, Altoetting, DE;
Tilman Zipplies, Burghausen, DE;
Klaus Hintzer, Kastl, DE;
Harald Kaspar, Burgkirchen, DE;
Andreas R. Maurer, Langenneufnach, DE;
Werner Schwertfeger, Altoetting, DE;
Tilman Zipplies, Burghausen, DE;
3M Innovative Properties Company, St. Paul, MN (US);
Abstract
The present invention provides an aqueous emulsion polymerization of fluorinated monomers including gaseous fluorinated monomers using a perfluoro ether surfactant as an emulsifier. The perfluoro ether surfactants correspond to formula (I)R—O—CFCF—X  (I)wherein Rrepresents a linear or branched perfluoroalkyl group having 1, 2, 3 or 4 carbon atoms and X represents a carboxylic acid group or salt thereof. In a further aspect, the invention also provides an aqueous fluoropolymer dispersion comprising the perfluoro ether surfactant and the use of such dispersion in the coating or impregnation of substrates.