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:
Dec. 23, 2008
Filed:
Oct. 06, 2003
Yasukazu Nakatani, Settsu, JP;
Kenji Ichikawa, Settsu, JP;
Yasukazu Nakatani, Settsu, JP;
Kenji Ichikawa, Settsu, JP;
Daikin Industries, Ltd., Osaka, JP;
Abstract
The present invention provides a method of purifying an aqueous fluoropolymer emulsion by which fluorine-containing surfactants can be removed without lowering the dispersibility of the aqueous fluoropolymer dispersions. The present invention provides a method of purifying an aqueous fluoropolymer emulsion comprising; purifying an aqueous fluoropolymer emulsion by a specific technique of concentration wherein the aqueous fluoropolymer emulsion comprises a fluoropolymer and a fluorine-containing surfactant, said specific technique of concentration comprises concentration by phase separation, electric concentration and/or ion exchange concentration, and said concentration by phase separation, electric concentration and/or ion exchange concentration is carried out for removing the fluorine-containing surfactant.