Semipermeable membranes of aromatic disulfimide containing polyamides
AssigneeBayer Aktiengesellschaft
InventorsKlaus Elfert, Gerhard D. Wolf, Hans J. Rosenkranz
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Abstract
The invention relates to membranes which consist of aromatic polyamides containing disulphimide groups and have relative viscosities .eta..sub.rel of .gtoreq.1.4 as measured on a 0.5% N-methylpyrrolidone solution at 20.degree. C., and which may be used for ultrafiltration and inverse osmosis. The membranes of these polyamides according to the invention have a high permeability to water, for example, a throughflow of 1000-5000 1/m.sup.2 d under a pressure of 20 bars, and a high retention capacity for dissolved substances.
Claims7
A water-insoluble semipermeable membrane consisting of an aromatic polyamide containing at least 20 mol % of structural segments containing disulphimide groups and having a relative viscosity .eta..sub.rel of .gtoreq.1.4, as measured on a 0.5% N-methyl pyrrolidone solution at 20.degree. C.
Dependencies are inferred from the claim text.