Process for preparing an asymmetrical macroporous membrane polym

Details Process for preparing an asymmetrical macroporous membrane polym Process for preparing an asymmetrical macroporous membrane polym

1989-10-23

1991-04-23

Lorin, Hubert C.

Plastic and nonmetallic article shaping or treating: processes

Pore forming in situ

Composite article making

264 41, 264 48, 264232, 264340, 427245, 21050028, 21050033, 21050041, 21050042, B01D 7168, B01D 6912

Patent

active

050098241

ABSTRACT:
A process for preparing an asymmetrical macroporous membrane from a polymer solution comprised as the dissolved portion fraction a polymeric mixture comprised of about 5-70% by weight of polyvinylpyrrolidone having a molecular weight of .gtoreq.100,000 Dalton and about 95-30% by weight of a polymer selected from the group consisting of polysulfone, a polyether sulfone, and an aromatic or araliphatic polyamide, said weight being relative to the total weight of the dissolved polymeric fraction, by action of a coagulating liquid, wherein the coagulation is effected under conditions such that skin formation, asymmetrical port formation and retention of the polyvinylpyrrolidone are achieved, recovering the asymmetrical macroporous membrane comprising the polymeric mixture.

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