Process for producing porous membranes

Details Process for producing porous membranes Process for producing porous membranes

B - Operations, Transporting

01

D

18/24

B01D 67/00 (2006.01) B01D 69/06 (2006.01) C08J 9/28 (2006.01)

Patent

CA 1314667

- 43 - Abstract The present invention provides a process for producing porous membranes which comprises the steps of dissolving a film-forming polymer in a good solvent for said polymer, forming a film of the resulting polymer solution, and forcibly contacting saturated steam or mist-containing steam with at least one surface of said film. The resulting porous membranes have pores having a narrow pore diameter distribution and extending in a direction substantially perpendicular to the membrane surface at a high surface pore density on at least one surface thereof. In another embodiment, the resulting porous membranes, although having no straight pores, are devoid of a nonporous layer.

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