Modified polyvinylalcohol containing semipermeable composite mem

Details Modified polyvinylalcohol containing semipermeable composite mem Modified polyvinylalcohol containing semipermeable composite mem

1988-02-25

1990-03-27

Spear, Frank

Liquid purification or separation

Processes

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

210654, 210490, 21050042, B01D 1300

Patent

active

049118447

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

REFERENCES:
patent: 4015955 (1977-04-01), Steigelmann et al.
patent: 4230463 (1980-10-01), Henis et al.
patent: 4753725 (1988-06-01), Linder et al.

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