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Title
Nicht-poroese, flaechige und faserfoermige Polymergebilde mit hydrophiler Oberflaeche und deren Verwendung als Membranen fuer die Dialyse oder Elektrodialyse
Date Issued
1996
Author(s)
Patent No
1992-4211266
Abstract
The invention relates to flat or fibre-shaped polymer structures with a hydrophile surface, e.g. polymer diaphragms and coatings, and a process for their production from the liquid phase. From a polymer solution comprising a solvent or solvent mixture, from one or several polymers with polar groups and, if necessary, from further additives, a polymer film, a polymer foil, one more or less thick polymer layer or polymer fibres are produced using known techniques, if necessary on a base; during production, the flat or fibre-shaped polymer structure is exposed to an inert gas or gas mixture containing water vapour or saturated with water vapour, a gas or gas mixture is used with such high contents of water vapour that firstly, a condensation of water vapour is avoided and secondly, the mixing gap in the phase diagram of polymer-solvent-water is achieved, the solvent is removed and the flat or fibre-shaped polymer structure is dried, if necessary.
Language
de
Patenprio
DE 1992-4211266 A: 19920403