Semipermeable membranes of heterocyclic copolyamides

Details Semipermeable membranes of heterocyclic copolyamides Semipermeable membranes of heterocyclic copolyamides

1978-07-24

1980-09-09

Anderson, Harold D.

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

Synthetic resins

From carboxylic acid or derivative thereof

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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