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AssigneeKorea Institute of Science and Technology
InventorsJae Min Hong, Seong Ryong Ha, Hyun Chae Park, Yong Soo Kang, Kyu Hong Ahn
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The present invention describes a method for preparing an asymmetric porous membrane by a dry-wet phase inversion method, which comprises contacting a cast or spun polymer solution with water or organic vapor prior to immersing into the non-solvent precipitation medium, whereby said water or organic vapor is adsorbed onto the cast or spun polymer solution. Higher permeability and excellent rejection ability can be obtained, due to the high porosity and uniform pore size of said membranes according to the present invention.
A method for preparing an asymmetric porous membrane by a dry-wet phase inversion process, comprising bringing a cast or spun polymer solution into contact with a gas containing water vapor or organic vapor prior to immersing the cast or spun polymer solution into a non-solvent precipitation medium, whereby said water vapor or organic vapor is adsorbed onto said polymer solution.
Dependencies are inferred from the claim text.