Preparation of polyethersulfone membranes

Details Preparation of polyethersulfone membranes Preparation of polyethersulfone membranes

1999-02-08

2000-05-02

Foelak, Morton

Plastic and nonmetallic article shaping or treating: processes

Pore forming in situ

21050041, 427244, 427245, 521 64, B01D 6902

Patent

active

060569034

ABSTRACT:
A method for making a skinless essentially symmetrical hydrophobic polysulfone microporous membrane by the steps of (a) forming a casting solution containing (i) a dissolved polyethersulfone polymer, (ii) a solvent for the polyethersulfone polymer, and (iii) a lower aliphatic glycol; (b) coating a substrate with the casting composition; (c) exposing the coated substrate to atmospheric conditions; (d) passing the exposed coated substrate into a precipitation bath to precipitate the membrane, the precipitation bath containing a lower aliphatic glycol and water; (e) rinsing the membrane; and (f) drying the membrane.

REFERENCES:
patent: 4629563 (1986-12-01), Wrasidlo
patent: 4774039 (1988-09-01), Wrasidlo
patent: 4900449 (1990-02-01), Kraus et al.
patent: 4964990 (1990-10-01), Kaus et al.
patent: 5108607 (1992-04-01), Kraus et al.

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