Process for the preparation of polyether amide solutions, steam-sterilizable dialysis membranes obtainable using the polyether-amide solutions, and a process for the production of these membranes

US5859175A · kind A · utility

Assignee

• Hoechst GmbH · DE

Inventors

• Karsten Blatter · Lechenich, DE
• Reinhard Wagener · Hofheim, DE
• Carl-Martin Bell · Hechingen, DE
• Hermann Gohl · Bisingen, DE

Key dates

• Filing date: Dec 20, 1996
• Grant date: Jan 12, 1999
• Expiry date: Dec 20, 2016

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B01D2325/022
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

Process for the preparation of polyether-amide solutions, steam-sterilizable dialysis membranes obtainable using the polyether-amide solutions, and a process for the production of these membranes. Polycondensation of one or more dicarboxylic acid derivatives of the formula I ##STR1## with one or more aromatic diamines of the formula II ##STR2## and, if appropriate, m-phenylenediamine, in aprotic polar solvents is known. As a result of passing ammonia, in an amount sufficient to neutralize the HCl formed, into the polymer solution obtained after the end of the polycondensation and filtering off the ammonium chloride formed, it is possible to prepare neutral, salt-free and particularly storage-stable polyether-amide solutions which can be further processed to membranes without isolation of the polymer. The resulting membranes are steam-sterilizable, chemically and thermally stable and show efficiency data in the region of that of good high-flux dialysis membranes. Flat and hollow fiber membranes for ultrafiltration.