Method for production of porous membrane

Details Method for production of porous membrane Method for production of porous membrane

1986-11-12

1988-09-20

Anderson, Philip

Plastic and nonmetallic article shaping or treating: processes

Pore forming in situ

21050036, 264216, 26433117, C08J 928, B29C 3900

Patent

active

047724404

ABSTRACT:
In a method for the manufacture of a porous membrane by the steps of causing a polymer solution to flow and spread in a uniform thickness on a substrate and solidifying the formed layer of the polymer solution in a bad solvent, the improvement which comprises using a fluorinated hydrocarbon as the bad solvent and optionally carrying out the removal of a good solvent mingling into the fluorinated hydrocarbon during the course of the solidification by the technique of extraction from water, and repeating the fluorinated hydrocarbon.

REFERENCES:
patent: 3928517 (1975-12-01), Knight et al.
patent: 4203848 (1980-05-01), Grandine, II
patent: 4444716 (1984-04-01), Aoyagi et al.

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