Process for preparing a membrane

Details Process for preparing a membrane Process for preparing a membrane

1979-05-24

1981-02-03

Spear, Jr., Frank A.

Coating processes

Foraminous product produced

Filter, sponge, or foam

427245, 427352, 427246, 2105002, B05D 500, B01D 1300

Patent

active

042489130

ABSTRACT:
A process for preparing a microporous polymeric membrane, which process comprises 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 cast film with the microporous leaching liquid to provide a membrane, the improvement which comprises: providing a casting solution which comprises a vinylidene fluoride polymer and from about 35 to about 85% by weight of a vinyl acetate polymer; and hydrolyzing the acetate polymer after the leaching step to convert the acetate groups to hydroxyl groups, to provide an improved membrane having good mechanical strength and hydrophilic properties.

REFERENCES:
patent: 2884387 (1959-04-01), Bieber et al.
patent: 3194727 (1965-07-01), Adams et al.
patent: 3216882 (1965-11-01), Feldt et al.
patent: 3247133 (1966-04-01), Chen
patent: 3276996 (1966-10-01), Lazare
patent: 3615024 (1971-10-01), Michaels
patent: 3750735 (1973-08-01), Chang et al.
patent: 3951621 (1976-04-01), Hughes et al.
patent: 4113912 (1978-09-01), Okita

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