Stabilization of fluoropolymers

Details Stabilization of fluoropolymers Stabilization of fluoropolymers

1991-08-01

1993-01-19

Michl, Paul R.

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

Synthetic resins

Treating polymer containing material or treating a solid...

526214, 526249, 526250, 526255, 528486, 528489, 528490, C08F 800, C08F 614

Patent

active

051808030

ABSTRACT:
A method for the stabilization and isolation of a fluoropolymer bearing carboxylic acid (--CO.sub.2 H) groups and prepared as an aqueous dispersion using a dispersion polymerization process which employs a dispersing agent whose dispersion-stabilizing effect is removable by heating the dispersion and an initiator (or initiator system) which yields carboxylic acid groups on the fluoropolymer, which method comprises, after preparing an aqueous dispersion of the fluoropolymer using dispersion polymerization, converting the carboxylic acid groups on the fluoropolymer in the aqueous dispersion to carboxylate anion groups (--CO.sub.2 --) using a base and then heating the so-modified fluoropolymer dispersion to cause simultaneously:

REFERENCES:
patent: 3752789 (1973-08-01), Khan
patent: 4384092 (1983-05-01), Blaise et al.
patent: 5118788 (1992-06-01), Hosokawa et al.

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