METHOD OF PRODUCING THE COMPOSITION POLYMERIC PREVARICATING DIAPHRAGM Russian patent published in 1997 - IPC

FIELD: food and chemical industry, medicine, biotechnology. SUBSTANCE: diaphragms for dehydration of an aqueous-organic mixtures were produced by prevaporation method being firstly by wetting forming the microporous backing. Then diffusion layer is formed on its surface by pouring acrylic polymer an aqueous solution. For backing forming 8-15% solutions of aromatic polyimide derivatives in aprotonic solvent were used. These polyimide derivatives involve polyamidoimides at value [η]20°CN-МP

= 1,2-2,2 = 1.2-2.2 dl/g based on 4-chloroformyl-N,n-(chloroformylphenyl)-phthalimide and 4,4'-diaminodiphenyl ester, 3,5-diaminobenzoic acid or 4,4'-diaminodiphenylsulfone and polyetherimides at value [η]20°CN-МP = 0,1-1,1 = 0.1-1.1 dl/g based on 1,3-bis-(3,4-dicarboxyphenoxybenzene dianhydride and 4,4'-bis-(4''-aminophenoxy)-diphenylsulfone and 4,4'-bis-(4''-aminophenylthio)-diphenyloxide. EFFECT: improved method of producing. 3 cl, 1 tbl