04473475 is referenced by 29 patents and cites 8 patents.

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.

Title
Charge modified microporous membrane, process for charge modifying said membrane, and process for filtration of fluids
Application Number
6/268543
Publication Number
4473475
Application Date
May 29, 1981
Publication Date
September 25, 1984
Inventor
Asit K Roy
Seguin
TX, US
George T Emond
Southington
CT, US
Chaokang Chu
East Hartford
CT, US
Robert G Barnes Jr
Meriden
CT, US
Agent
Michael E Zall
David E Dougherty
Assignee
AMF
NY, US
IPC
B01D 13/00
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