Polyvinyl alcohol semi-permeable membrane and method for produci

Details Polyvinyl alcohol semi-permeable membrane and method for produci Polyvinyl alcohol semi-permeable membrane and method for produci

1979-05-21

1981-07-21

Spear, Jr., Frank A.

Liquid purification or separation

Filter

Material

264 49, 521141, B01D 3100, B01D 1300

Patent

active

042797527

ABSTRACT:
A polyvinyl alcohol (PVA) microporous membrane is disclosed which is prepared by a process which comprises forming a PVA membrane containing fine silica particles therein and substantially extracting said silica particles from said membrane, thereby forming a plurality of micropores therein with an average diameter of 0.01 to 50 microns and a porosity of at least 60%.

REFERENCES:
patent: 2329322 (1943-09-01), Baty et al.
patent: 3351495 (1967-11-01), Larsen et al.
patent: 3376238 (1968-04-01), Gregorian et al.
patent: 4073733 (1978-02-01), Yamauchi et al.
patent: 4083906 (1978-04-01), Schindler et al.

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