Ultrafiltration membrane of polyamide

Details Ultrafiltration membrane of polyamide Ultrafiltration membrane of polyamide

1984-10-10

1986-06-17

Lawrence, Evan K.

Liquid purification or separation

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Material

264 41, B01D 3900

Patent

active

045955034

ABSTRACT:
A membrane is disclosed of polyamide, a copolyamide or a mixture of polyamides, suitable for ultrafiltration and composed of an ultrafiltration skin and a backing layer. The pore size in the backing layer increases with distance from the ultrafiltration skin. The membrane is prepared by dissolving a polyamide in at least 75% formic acid, applying a casting solution, containing about 12-22% by weight polyamide and about 1-7% by weight polyethylene glycol in formic acid which has been brought to a temperature of below about 18.degree. C., as a thin layer onto a carrier foil resistant to the components of the solution, introducing the casting solution on the carrier foil into a precipitation and washing bath, withdrawing the casting solution as a coagulated and washed membrane from the carrier foil, stretching in at least one direction and subsequently drying this coagulated and washed membrane.

REFERENCES:
patent: 3615024 (1971-10-01), Michaels
patent: 3876738 (1975-04-01), Marinaccio et al.
patent: 4203847 (1980-05-01), Grandine, 2nd
patent: 4340481 (1982-07-01), Mishiro et al.

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