Process for preparing an asymmetrical macroporous membrane polymer

US5009824A · kind A · utility

Assignee

• Hoechst GmbH · DE

Inventors

• Axel Walch · Baldham, DE
• Juergen Wildhardt · Haigerloch, DE
• Dieter Beissel · Wiesbaden, DE

Key dates

• Filing date: Oct 23, 1989
• Grant date: Apr 23, 1991
• Expiry date: Oct 23, 2009

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B01D2325/36
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

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.