Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Processes of preparing a desired or intentional composition...
Reexamination Certificate
2003-10-06
2008-12-23
Mulcahy, Peter D. (Department: 1796)
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Processes of preparing a desired or intentional composition...
C210S662000, C524S544000, C526S243000, C554S191000
Reexamination Certificate
active
07468403
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 concentrationwherein 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, andsaid concentration by phase separation, electric concentration and/or ion exchange concentration is carried out for removing the fluorine-containing surfactant.
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Ichikawa Kenji
Nakatani Yasukazu
Daikin Industries Ltd.
Hu Henry
Mulcahy Peter D.
Sughrue & Mion, PLLC
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