Process for preparing a composite amphoteric ion exchange membra

Details Process for preparing a composite amphoteric ion exchange membra Process for preparing a composite amphoteric ion exchange membra

1978-02-02

1981-04-14

Smith, Ronald H.

Coating processes

Foraminous product produced

Microporous coating

2105002, 210506, 427340, 521 27, 521 28, 521 32, 521 33, B05D 310, B05D 500

Patent

active

042620414

ABSTRACT:
A process for preparing a composite amphoteric ion exchange membrane, which comprises forming a thin membrane not exceeding 5 microns thick by applying to a surface of a microporous polymer substrate having a physical, selective permeability of its own, a coating consisting of a polymer having either a cation or anion exchange group and a functional group capable of receiving another ion exchange group having an opposite sign from the cation or anion exchange group or a mixture of two polymers one of which has either a cation or an anion exchange group and the other of which has a functional group capable of receiving an ion exchange group having an opposite sign from the cation or anion exchange group, and introducing the ion exchange group having an opposite sign to said functional group to provide a ratio of anion to cation exchange capacity in the range of from 0.5 to 2.0.

REFERENCES:
patent: 3663263 (1972-05-01), Bodre et al.
patent: 3868314 (1975-02-01), Mizutani et al.
patent: 3878092 (1975-04-01), Fuller
patent: 3945927 (1976-03-01), Imai et al.
patent: 3957698 (1976-05-01), Hatch
patent: 3963662 (1976-06-01), Fujiwara et al.
patent: 4012324 (1977-03-01), Gregor
patent: 4014798 (1977-03-01), Rembaum
patent: 4115297 (1978-09-01), Bolto et al.
patent: 4119581 (1977-10-01), Rembaum et al.

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