Process for recovering fluoropolymers

Details Process for recovering fluoropolymers Process for recovering fluoropolymers

2006-03-21

2006-03-21

Cain, Edward J. (Department: 1714)

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Processes of preparing a desired or intentional composition...

C521S046000

Reexamination Certificate

active

07015263

ABSTRACT:
A process for recovering fluoropolymers, which comprises contacting an ion exchange membrane comprising a fluoropolymer having carboxylic acid groups (hereinafter referred to as a C-polymer) and a fluoropolymer having sulfonic acid groups (hereinafter referred to as a S-polymer) and having inorganic particles deposited on the surface, with a solvent to let it swell and to remove the inorganic particles from the surface, then, contacting it with a solvent which is a good solvent for the S-polymer and a poor solvent for the C-polymer to obtain a solid composed mainly of the C-polymer and a solution having the S-polymer dissolved therein, and recovering them by solid-liquid separation.

REFERENCES:
patent: 4433082 (1984-02-01), Grot
patent: 4585801 (1986-04-01), Burney, Jr. et al.
patent: 6515102 (2003-02-01), Kumai et al.
patent: 03-014860 (1991-02-01), None
patent: 11-288732 (1999-10-01), None
patent: 10-258621 (2000-03-01), None
patent: 2000-86809 (2000-03-01), None
Patent Abstracts of Japan, JP 2000 086809, Mar. 28, 2000.

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