Copolyimides, their preparation and the use thereof

Details Copolyimides, their preparation and the use thereof Copolyimides, their preparation and the use thereof

C - Chemistry, Metallurgy

08

G

C08G 73/10 (2006.01) B01D 61/00 (2006.01) B01D 71/64 (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) C08G 73/14 (2006.01) C09D 179/08 (2006.01) G03F 7/038 (2006.01) G03F 7/26 (2006.01)

Patent

CA 2049265

ABSTRACT FL/6-18203/A Copolyimides, their preparation and the use thereof Mixtures of salts of organic dicarboxylic 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 copolyimide which contains a first aromatic diamine radical (1) and a second aromatic diamine radical (2) which carries -SO3M groups, wherein M is H?, a mono- to trivalent metal cation or an ammonium cation. The first amine radical (1) and/or the second diamine radical (2) contains C1-C4alkyl groups in both o-positions to at least one amino group. These copolyamides are also radiation-sensitive (self-crosslinking) and can be used for the production of protective layers or relief images, development being carried out in an aqueous alkaline medium.

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