Patent · US Expired

Reverse osmosis membrane

US4039440A · kind A · utility

81Cited by
6References
5Claims
0Family size

Assignee

Inventor

Key dates

Filing dateJan 16, 1975
Grant dateAug 2, 1977
Priority date—
Expiry dateJan 16, 1995

Classification

  • Technology area (CPC B)Performing Operations; Transporting
  • CPC primaryB01D71/601
  • WIPO fieldChemical engineering
  • WIPO sectorChemistry

Abstract

A reverse osmosis membrane is prepared by reaction of a film or layer of polyethylenimine with a polyfunctional reagent whose functional groups are capable of reacting with amine groups. The polyfunctional reagent is preferably a water-soluble, aromatic or heterocyclic compound having acid chloride or isocyanate functional groups. The membrane is preferably prepared in situ on a polysulfone or chlorinated polyvinyl chloride support by initial formation of a layer of polyethylenimine on the support, followed by interfacial reaction with the polyfunctional reagent to produce a thin surface coating possessing salt barrier characteristics.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.