Coating processes – Foraminous product produced – Microporous coating
Patent
1998-06-05
2000-10-17
Beck, Shrive
Coating processes
Foraminous product produced
Microporous coating
427244, 427333, 4274122, 118217, 118255, B05D 136, B05D 140
Patent
active
061328049
ABSTRACT:
A process for producing high quality reverse osmosis, nanofiltration, and ultrafiltration membranes in a high speed process provides membranes which have excellent rejection characteristics coupled with high flux capabilities. The process employs tandem coating techniques to coat a microporous substrate with a thin membrane on the order of 25 .ANG. to 1.0 microns. The tandem coating process comprises tandem offset gravure and subsequent slot die coating applicators, or alternatively comprises tandem slot die coating applicators. For reverse osmosis and nanfiltration membranes, a wet-on-wet coating process is used to coat a porous substrate first with an aqueous solution, and then with an organic solution to produce a cross-linked, interfacially polymerized composite membrane. Single slot coating applicators are utilized to produce ultrafiltration membranes.
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Modern Coating and Drying Technology, by Edward D. Cohen and Edgar B. Gutoff (No date).
Puglia John P.
Rice William C.
Beck Shrive
Crockford Kirsten A.
Koch Membrane Systems, Inc.
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