Microporous polymeric membrane

Details Microporous polymeric membrane Microporous polymeric membrane

1979-09-21

1981-11-24

Spear, Jr., Frank A.

Liquid purification or separation

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Material

427244, 521905, B01D 3100

Patent

active

043023347

ABSTRACT:
A microporous polymeric membrane is made by preparing a polymer-casting solution, casting a thin film of the casting solution on a support base, allowing partial evaporation of the solvent from the cast film for a predetermined period of time and contacting the partially evaporated film with a leaching liquid to provide the microporous membrane. A membrane with particularly good mechanical strength and hydrophilic properties is formed when the casting solution comprises a vinylidene fluoride polymer and from about 35 to about 85% by weight of a vinyl acetate polymer; and when the acetate polymer is hydrolyzed after the leaching step to convert the acetate groups to hydroxyl groups.

REFERENCES:
patent: 3216882 (1965-11-01), Feldt et al.
patent: 3615024 (1971-10-01), Michaels
patent: 3957941 (1976-05-01), Kawaguchi
patent: 3962158 (1976-06-01), Mima et al.
patent: 4113912 (1978-09-01), Okita
patent: 4134837 (1979-01-01), Yamashita et al.
patent: 4164529 (1979-08-01), Fujita et al.

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