Semipermeable composite membranes, their manufacture, and use

Details Semipermeable composite membranes, their manufacture, and use Semipermeable composite membranes, their manufacture, and use

1981-09-11

1988-06-28

Spear, Frank

Liquid purification or separation

Processes

Liquid/liquid solvent or colloidal extraction or diffusing...

21050042, B01D 1300

Patent

active

047537256

ABSTRACT:
Semipermeable composite membranes containing on one surface of a porous support a superficial thin film having semipermeable properties. The film contains polyvinyl alcohol (PVA)/polyvinyl alcohol-copolymers (PVA-copolymers) modified by at least radicals containing ionizable groups are provided. The modification steps comprise e.g. reacting PVA/PVA-copolymer films with

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patent: 4247401 (1981-01-01), Bloch et al.
patent: 4305823 (1981-12-01), Batzer et al.

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