Abstract: Composite solvent stable membranes for treating organic liquids comprise a crosslinked layer of less than 5 microns in thickness supported on a solvent stable porous membrane substrate, which layer includes at least one polymer selected from polyphenylene oxide type polymers and polysulfone type polymers, provided that the crosslinked layer includes at least one polymer derived from haloalkylated polyphenylene oxide type monomers. Such composite membranes include solvent stable membranes which swell to an extent of no more than about 10% when immersed in various organic solvents, and their mixtures with each other and/or water.
Type:
Grant
Filed:
August 30, 1991
Date of Patent:
September 29, 1992
Assignee:
Membrane Products Kiryat Weizmann Ltd.
Inventors:
Mordechai Perry, Henia Yacubowicz, Charles Linder, Mara Nemas, Reuven Katraro
Abstract: A process for preparing a microporous membrane, which comprises casting the membrane from a solution comprising a mixture of at least one pore-forming polymer and at least one film-forming polymer, and a solvent for the mixture of polymers, wherein the at least one pore-forming polymer is one which if cast alone would contract to form either large pores or a non-uniform distribution of material.
Type:
Grant
Filed:
March 10, 1987
Date of Patent:
August 2, 1988
Assignee:
Membrane Products Kiryat Weizmann Ltd.
Inventors:
Charles Linder, Mordechay Perry, Reuven Ketraro