Copolyimides, their preparation and the use thereof

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

1992-06-17

1993-03-30

Kight, III, John

Radiation imagery chemistry: process, composition, or product th

Electric or magnetic imagery, e.g., xerography,...

Electrophoretic imaging, process, composition, or product

210651, 4284735, 430 56, 528220, 528226, 528229, 528353, G03G 1704, C08G 802

Patent

active

051983168

ABSTRACT:
Mixtures of salts of organic dicarboxylic acids and organic compounds of non-salt character, dissolved in a C.sub.1 -C.sub.4 alkanol, 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 --SO.sub.3 M groups, wherein M is H.sym., a mono-to trivalent metal cation or an ammonium cation. The first amine radical (1) and/or the second diamine radical (2) contains C.sub.1 -C.sub.4 alkyl 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.

REFERENCES:
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patent: 5145940 (1992-09-01), Wernet et al.
Chem. Abst. 71-425 185/25 (FR 2050251).
Chem. Abst. 74-74721v/43 (FR2212356).

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