Semipermeable membranes of heterocyclic copolyamides

Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From carboxylic acid or derivative thereof

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210500M, 260 302, 264184, 428 36, 528183, 528185, 528193, 528194, 528220, 528229, 528327, 528331, 528336, 528340, 528348, C08G 6932

Patent

active

042219035

ABSTRACT:
The invention relates to semipermeable membranes with a water absorption capacity of from 4.5 to 11% by weight, preferably from 4.5 to 8% by weight, as measured on approximately 40.mu. thick symmetrical films at room temperature and at 65% relative air humidity, a throughflow of 130 to 200 l/m.sup.2 d for a desalination level of 94.6 to 99.5% and consisting of an aromatic heterocycle-containing copolyamide with a relative viscosity of .gtoreq.1.4, as measured on a 0.5% N-methyl pyrrolidone solution at a temperature of 20.degree. C.

REFERENCES:
patent: 3567632 (1971-03-01), Richter et al.
patent: 3664986 (1972-05-01), MacDonald
patent: 3696031 (1972-10-01), Credali et al.
patent: 4123424 (1978-10-01), Credali et al.
Advanced Organic Chemistry--Royals, p. 412.

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