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:
Feb. 21, 2012
Filed:
Jul. 13, 2006
Klaus Hintzer, Kastl, DE;
Michael Jürgens, Neuoetting, DE;
Harald Kaspar, Burgkirchen, DE;
Andreas R. Maurer, Langenneufnach, DE;
Werner Schwertfeger, Aitoetting, DE;
Tilman C. Zipplies, Burghausen, DE;
Klaus Hintzer, Kastl, DE;
Michael Jürgens, Neuoetting, DE;
Harald Kaspar, Burgkirchen, DE;
Andreas R. Maurer, Langenneufnach, DE;
Werner Schwertfeger, Aitoetting, DE;
Tilman C. Zipplies, Burghausen, DE;
3M Innovative Properties Company, Saint Paul, MN (US);
Abstract
A process comprising polymerizing tetrafluoroethylene in an aqueous emulsion in the presence of a non-telogenic surfactant having an anionic portion with the general formula (I):R—O-L-CO—  (I)wherein Ris selected from a partially fluorinated alkyl group, a perfluorinated alkyl group, a partially fluorinated alkyl group interrupted by one or more oxygen atoms, and a perfluorinated alkyl group interrupted by one or more oxygen atoms, wherein Rhas from 1 to 10 carbon atoms; and L is an alkylene group having the general formula (CX)wherein each X is independently selected from R, fluorine, and hydrogen and n is selected from 1 to 5, with the proviso that the surfactant contains at least one unit selected from a —CH— unit and a —CHF— unit. Also provided are aqueous dispersions comprising these surfactants and methods of coating substrates with the aqueous dispersions.