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US 5,173,335 AGranted
Method of producing multilayer reverse osmosis membrane of polyamide-urea
AssigneeE. I. Du Pont de Nemours and Company
InventorSamuel D. Arthur
Life of this patent
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Abstract
The present invention is directed to a method of producing an improved reverse osmosis membrane that shows surprisingly improved solute rejection and permeation properties. The membrane includes a separating layer of a polyamideurea formed in situ by reaction of isocyanate-substituted acyl chloride and a diamine-treated microporous substrate.
Claims14
A method of manufacture of a reverse osmosis membrane that shows improved solute rejection and solvent flux, comprising,
- casting a solution of an organic polymer onto a support to provide a porous substrate,
- treating said substrate with a polyfunctional amine to provide an impregnated substrate, and
- treating said impregnated substrate with a solution of isocyanate-substituted acyl halide to provide a reverse osmosis membrane with a separating layer of polyamide urea that shows improved solute rejection and solvent flux.
Dependencies are inferred from the claim text.