Amphoteric ion-permeable composite membrane

Details Amphoteric ion-permeable composite membrane Amphoteric ion-permeable composite membrane

1981-01-15

1982-11-23

Van Balen, William J.

Liquid purification or separation

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Material

210638, 4283155, 4283166, 521 27, 521 28, 521 32, B05D 310, B05D 500

Patent

active

043604340

ABSTRACT:
An amphoteric ion-permeable composite membrane composed of a microporous substrate, and supported on the substrate, a thin amphoteric ion-exchange film formed of an active amino group-containing polymer which has been interfacially crosslinked at least at the surface portion of the thin film, said membrane being produced by forming a thin layer comprising an active amino group-containing polymer containing 1.0 to 23 milliequivalents/g, as amino equivalent, of an active amino group selected from primary and secondary amino groups and 0 to 18 milliequivalents/g, as amino equivalent, of a tertiary amino group and/or an ammonium salt group per molecule with the total amino content thereof being in the range of 2.0 to 23 milliequivalents/g on the microporous substrate and then contacting the thin layer on the substrate interfacially with a polyfunctional aromatic compound containing at least two functional groups selected from carbonyl halide groups, sulfonyl halide groups, carboxylic acid anhydride groups, sulfonic acid anhydride groups and derivative groups of carboxylic acids and sulfonic acids having equivalent reactivity to the aforesaid halide and anhydride groups.

REFERENCES:
patent: 4262041 (1981-04-01), Eguchi et al.
patent: 4277344 (1981-07-01), Cadotte

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