Semipermeable membrane treated with modified vinyl polymer

Details Semipermeable membrane treated with modified vinyl polymer Semipermeable membrane treated with modified vinyl polymer

1982-05-27

1984-10-23

Sadowski, David

Liquid purification or separation

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Material

210506, B01D 3100

Patent

active

044787170

ABSTRACT:
A membrane treating agent for rejuvenating and improving a rejection performance of a semipermeable membrane, which contains an effective amount of a modified vinyl polymer having acetoxy groups and at least one group represented by the Formula (I) and/or (II): ##STR1## wherein R is a radical selected from the group consisting of aliphatic, aromatic and heterocyclic radicals having from 1 to 9 carbon atoms, and n is an integer from 1 to 3.
Valuable modified vinyl polymers are obtained by reacting a partially saponified vinyl polymer with at least one carboxylic acid such as maleic acid, phthalic acid, succinic acid, butane tetracarboxylic acid and/or acid anhydrides or acid chlorides thereof.

REFERENCES:
patent: 3220960 (1965-11-01), Wichterle et al.
patent: 3556305 (1971-01-01), Shorr
patent: 3877978 (1975-04-01), Kremen et al.
patent: 3962158 (1976-06-01), Mima et al.
U.S. Department of Commerce Patent Examiner Academy Notebook, Topic 7d, Formality Term List, (two pp.), 10/25/1977.

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