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. 02, 2011
Filed:
Jan. 15, 2009
Michael Cregg Coughlin, Wilmington, DE (US);
Ming-hong Hung, Wilmington, DE (US);
Michael Cregg Coughlin, Wilmington, DE (US);
Ming-Hong Hung, Wilmington, DE (US);
DuPont Performance Elastomers LLC, Wilmington, DE (US);
Abstract
An emulsion polymerization process for the production of non-elastomeric fluoropolymers is disclosed wherein at least one fluorosurfactant is employed as dispersant, said fluorosurfactant being a fluoroalkylphosphoric acid ester of the formula X-Rf-(CH)—O—P(O)(OM), wherein n is 1 or 2, X═H or F, M=a univalent cation, and Rf is a C-Cfluoroalkyl or fluoroalkoxy group. Optionally, a second dispersing agent may be employed in the polymerization, said second agent being a perfluoropolyether having at least one endgroup selected from the group consisting of carboxylic acid, a salt thereof, sulfonic acid and a salt thereof, phosphoric acid and a salt thereof.