Concentration or separation method, copolyamides and copolyimide

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

1991-08-12

1993-03-30

Sever, Frank

Liquid purification or separation

Processes

Liquid/liquid solvent or colloidal extraction or diffusing...

21050039, B01D 6100

Patent

active

051981190

ABSTRACT:
Mixtures of salts of organic carboxylic 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 copolyamide or copolyimide-amide which contains(a) a first aromatic diamine radical and (b) a second aromatic diamine radical which carries--SO.sub.3 M groups, where M is H.sym., a monovalent to polyvalent metal cation or an ammonium cation. Provided the first diamine radical contains C.sub.1 -C.sub.4 alkyl 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.

REFERENCES:
patent: 4075093 (1978-02-01), Walch et al.
patent: 4217227 (1980-08-01), Elfert et al.
patent: 4694061 (1987-09-01), Pfeifer
patent: 4714669 (1987-12-01), Pfeifer et al.
patent: 4904389 (1990-02-01), Waldhoff et al.
Chem. Abstract, vol. 13, No. 190 (C-593) (3538) May 8, 1989.
CA 110:25827c (1989).

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