Concentrated dispersions of fluorinated polymers and process for

Details Concentrated dispersions of fluorinated polymers and process for Concentrated dispersions of fluorinated polymers and process for

1980-02-28

1983-01-18

Anderson, Harold D.

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

Synthetic resins

Processes of preparing a desired or intentional composition...

523310, 523318, 523335, 523343, 524463, 524546, 528482, 528502, C08L 300, C08L 316

Patent

active

043692664

ABSTRACT:
Aqueous colloidal dispersions of fluorinated polymers can be concentrated, after adding a stabilizing emulsifier, to high solids contents by ultrafiltration over customary semi-permeable membranes if pumps which keep the dispersion free from contact with components which cause frictional forces are used for conveying the dispersion. A considerable proportion of the stabilizing emulsifier added and high proportions of the fluorine-containing emulsifier originally contained in the fluorinated polymer dispersion from the emulsion polymerization can be removed via the aqueous permeate. The fluorine-containing emulsifier can be recovered by a downwstream basic anion exchanger and the stabilizing emulsifier contained in the filtrate flowing out of the anion exchanger can be concentrated in this filtrate by reverse osmosis and optionally recycled into the ultrafiltration process. Fluorinated polymer dispersions which, in addition to having a high solids content, are distinguished by particularly low contents of fluorine-containing emulsifier and of stabilizing emulsifier can be obtained. The process can be applied to all known aqueous, colloidal dispersions of fluorinated homopolymers and copolymers.

REFERENCES:
patent: 2559752 (1951-07-01), Berry
patent: 3037953 (1962-06-01), Marks et al.
patent: 3301807 (1967-01-01), Hoashi
patent: 3316201 (1967-04-01), Hahn et al.
patent: 3925292 (1975-12-01), Holmes

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