Title:
POLYAMIDE MEMBRANE EXHIBITING AN INCREASED HYDROLYSIS STABILITY AND METHOD FOR THE PRODUCTION THEREOF
Document Type and Number:
WIPO Patent Application WO2001093994
Kind Code:
A8
Abstract:
The invention relates to a method for producing a hydrolysis-stable polyamide membrane having an open-pored, microporous and spongy support layer structure using a process involving thermally induced liquid-liquid phase separation. A solution of an aliphatic polyamide in a solvent system, preferably comprised of a solvent and of a nonsolvent for the polyamide, is extruded to form a shaped body. After leaving the shaping tool, the shaped body is cooled by means of a cooling medium until attaining phase separation and solidification of the polymer-rich phase while forming the membrane structure. The solution of the polyamide in the solvent system contains an antioxidant agent serving as a stabilizer for the polyamide which, together with the solvent system, is selected in such a manner that, at the phase separation temperature, the antioxidant agent is essentially insoluble in the solvent system. The invention also relates to a polyamide membrane exhibiting an increased hydrolysis stability, which is characterized by containing an antioxidant agent that serves as a stabilizer for improving the hydrolysis stability.
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Inventors:
WECHS FRIEDBERT (DE)
Application Number:
PCT/EP2001/005918
Publication Date:
March 04, 2004
Filing Date:
May 23, 2001
Export Citation:
Assignee:
MEMBRANA GMBH (DE)
WECHS FRIEDBERT (DE)
WECHS FRIEDBERT (DE)
International Classes:
B01D65/02; B01D67/00; B01D69/02; B01D71/56; B29C41/26; C08J5/18; B29K77/00; B29K105/04; B29L7/00; (IPC1-7): B01D71/56; B01D67/00
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