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US 5,019,264 AGranted
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 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.
Claims7
A reverse osmosis membrane that shows improved salt rejection, flux, and productivity, comprising a polyamideurea separating layer in contact with a polysulfone substrate, wherein said polyamideurea comprises the formula:
- ##STR2## where m,n>0,
- m+n.gtoreq.3,
- X=a (m+n) valent organic group, and
- Y=a divalent organic group.
1 more element
Dependencies are inferred from the claim text.