Charge modified microporous membrane, process for charge modifyi

Details Charge modified microporous membrane, process for charge modifyi Charge modified microporous membrane, process for charge modifyi

1981-05-29

1984-09-25

Spear, Frank

Liquid purification or separation

Processes

Liquid/liquid solvent or colloidal extraction or diffusing...

210639, 2105002, B01D 1300

Patent

active

044734751

ABSTRACT:
A cationic charge modified microporous membrane is provided. The membrane comrises a hydrophilic organic polymeric microporous membrane having bonded thereto, through a cross-linking agent, a charge modifying amount of a cationic charge modifying agent. The charge modifying agent is an aliphatic amine or polyamine, preferably tetraethylene pentamine, and the cross-linking agent is an aliphatic polyepoxide having a molecular weight of less than about 500, preferably 1, 4 butanediol diglycidyl ether. The microporous membrane is preferably nylon. The process for applying the charge modifying agent to the membrane, preferably comprises contacting the membrane with an aqueous solution of the charge modifying agent and then contacting the membrane with a substantially aqueous solution of the cross-linking agent. The preferred process uses high purity water, i.e. water having no significant ionic content, to produce a membrane suitable for use in filtering ultra pure (18 megohm-cm resistivity) water for use in producing electronic devices. Such a membrane exhibits an advantageously low "flush-out" time compared to known cationic charge modified microporous membranes and unmodified microporous membranes.

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Hofstee, "Hydrophobic and Other Non-Ionic Parameters in Protein, Separation and Adsorptive Immobilization by Substituted Agaroses," Polymer Science & Technology, vol. 16, Polymeric Separation Media, Edited by Anthony R. Cooper, Copyright 1982, (A collection of manuscripts based on presentations at a symposium, Polymeric Separation Media, organized for the Second Chemical Congress of the North American Continent, held in Las Vegas, Aug. 24-29, 1980), pp. 87-92.

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