Composite semipermeable membranes and methods of making same

Details Composite semipermeable membranes and methods of making same Composite semipermeable membranes and methods of making same

C - Chemistry, Metallurgy

08

J

18/16

C08J 9/00 (2006.01) B29D 27/00 (1980.01)

Patent

CA 1066465

ABSTRACT OF THE DISCLOSURE Composite semipermeable membranes are made by reacting a film-forming polymer with a cross-linking mono- mer to form a polymeric ultrathin film having semipermeable properties. During the formation, a grafting reaction is carried out at reactive sites so there are few remaining active sites where oxidising attack or fouling can poten- tially occur. One composite membrane comprises a micro- porous substrate and an ultrathin polyamide film formed of polyethylenimine cross-linked with a monomer, such as an acyl halide, a chloroformate, an isocyanate or a sul- fonyl chloride. Grafted onto the cross-linked polyethylen- imine at what would otherwise be secondary amido sites is an epoxide, an aldehyde, an anhydride or a reactive ethylene compound.

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