Process for removing fluorosurfactant from aqueous...

Details Process for removing fluorosurfactant from aqueous... Process for removing fluorosurfactant from aqueous...

2005-12-02

2009-11-17

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...

C524S544000, C524S700000, C524S805000, C526S249000, C526S250000

Reexamination Certificate

active

07619018

ABSTRACT:
A process for reducing fluorosurfactant content of a stabilized fluorosurfactant-containing aqueous fluoropolymer dispersion containing ferric ions by contacting the fluoropolymer dispersion with strong base anion exchange resin to reduce fluorosurfactant content to a predetermined level, the anion exchange resin being in the hydroxide form, separating the dispersion from the anion exchange resin, and adding an effective amount of chelating agent having an equilibrium constant when complexed with iron of at least 1018prior to the contacting with the ion exchange resin for complexing ferric ions to prevent scum formation.

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