Staged addition of non-fluorinated anionic surfactant to...

Details Staged addition of non-fluorinated anionic surfactant to... Staged addition of non-fluorinated anionic surfactant to...

2007-05-22

2010-02-23

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, C524S700000, C524S800000, C524S805000, C554S191000

Reexamination Certificate

active

07666928

ABSTRACT:
A process for reducing fluorosurfactant content of a fluorosurfactant-containing aqueous fluoropolymer dispersion stabilized with nonionic surfactant. The process includes reducing the fluorosurfactant content of the stabilized fluorosurfactant-containing aqueous fluoropolymer dispersion to a predetermined level to provide a reduced surfactant dispersion, adding non-fluorinated anionic surfactant to the reduced fluorosurfactant dispersion, and concentrating the reduced fluorosurfactant dispersion. The non-fluorinated anionic surfactant is added in stages wherein a first portion is added to the dispersion prior to concentrating and a second portion of the non-fluorinated anionic surfactant is added to the dispersion after concentrating.

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