Macroporous asymmetrical hydrophilic membrane made of a synthetic polymer

US4720343A · kind A · utility

Assignee

• Hoechst GmbH · DE

Inventors

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

Key dates

• Filing date: Dec 10, 1982
• Grant date: Jan 19, 1988
• Expiry date: Dec 10, 2002

Classification

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

Abstract

Disclosed are asymmetrical macroporous membranes based on a synthetic polymer comprising a polymeric mixture of 5 to 70% by weight polyvinylpyrrolidone having a molecular weight .gtoreq.100,000 Dalton and 95 to 30% by weight of a polymer selected from a group consisting of a polysulfone, a polyether sulfone and an aromatic or araliphatic polyamide, each of the percentages by weight being relative to the total weight of the polymeric mixture. The membrane has a water absorbency of at least 11% by weight of water, relative to its total weight, at 100% relative humidity and 25.degree. C. Also disclosed is a process for preparation of the membranes.