Concentration or separation method, copolyamides and...

Details Concentration or separation method, copolyamides and... Concentration or separation method, copolyamides and...

C - Chemistry, Metallurgy

08

G

C08G 73/10 (2006.01) B01D 61/24 (2006.01) B01D 71/56 (2006.01) B01D 71/64 (2006.01) C07C 51/42 (2006.01) C07C 51/47 (2006.01) C07C 53/00 (2006.01) C07C 57/10 (2006.01) C07C 57/32 (2006.01) C07C 57/44 (2006.01) C07C 63/08 (2006.01) C07D 307/68 (2006.01) C08L 77/00 (2006.01) C08L 79/08 (2006.01) G03F 7/038 (2006.01) G03F 7/26 (2006.01)

Patent

CA 2049266

FL/6- 1 8202/A Concentration or separation method, copolyamides and copolyimide-amides and the use thereof Abstract of the Disclosure Mixtures of salts of organic carboxylic acids and organic compounds of non-salt character, dissolved in a C1-C4alkanol, can be concentrated or separated with a semipermeable membrane made from a copolyamide or copolyimide-amide which contains (a) a firstaromatic diamine radical and (b) a second aromatic diamine radical which carries -SO3M groups, where M is H?, a monovalent to polyvalent metal cation or an ammonium cation. Provided the first diamine radical contains C1-C4alkyl groups in the o-positions to the amino groups, the copolymers are radiation-sensitive and can be used for producing protective layers or relief images, development being carried out in an aqueous alkaline medium.

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