Copolyimides, their preparation and the use thereof

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

1991-08-12

1992-09-08

Kight, III, John

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

From ketone or ketene reactant

210651, 4284735, 430 56, 528220, 528229, 528353, C08G 802

Patent

active

051459400

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:
patent: 3666709 (1972-05-01), Suzuki et al.
patent: 4629777 (1986-12-01), Pfeifer
patent: 4698295 (1987-10-01), Pfeifer et al.
patent: 4783372 (1988-11-01), Pfeifer
patent: 4792476 (1988-12-01), Numata et al.
patent: 4978733 (1990-12-01), Khanna
Abstract 71-425185/25 (FR 2050251).
Abstract 74-74721V/43 (FR 2212356).

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