Method of casting a porous membrane of polymeric material

Details Method of casting a porous membrane of polymeric material Method of casting a porous membrane of polymeric material

1988-12-07

1990-02-06

Lorin, Hubert C.

Plastic and nonmetallic article shaping or treating: processes

Pore forming in situ

264216, 264232, 264299, B29C 3942, B29C 6720

Patent

active

048986984

ABSTRACT:
A method of casting porous membranes of polymeric material is provided wherein the membrane has at least one of the following: a more homogeneous active skin layer for separation purposes with a lower molecular weight cut off, a more homogeneous active skin layer with a sharper molecular weight cut off curve, a relatively thinner active skin layer with a relatively greater flux for a given separation of a substance from a solution thereof, and relatively fewer imperfections through the active skin layer. The method comprises casting a layer of a casting solution on to a support, to provide a cast layer of the casting solution thereon with an exposed skin, then progressively submerging the cast layer in a gelation liquid at a relative velocity of at least 15 cm/second, whereby the exposed skin is gently scrubbed with gelation liquid to continuously remove outwardly diffusing solvent therefrom and dissipate exothermic heat, thus causing gelation of at least a stable, more homogeneous active skin layer, with build-up of a solvent boundary layer between the exposed surface of the layer and the gelation liquid minimized.

REFERENCES:
patent: 4744807 (1988-05-01), Minhas et al.
patent: 4772440 (1988-09-01), Kasi et al.
Xie-Quing, XV, "Additives for the Preparation of Polysulfone-based Ultrafiltration Membranes, especially for Hemodialysis and Hemo-Osmometer" in Desalination, 48(1983), 79-84, Elsevier Science Publishers B.V., Amsterdam.

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