| US 7,537,718 B2 | ||
| Hydrophilic polyethersulfone membrane and method for preparing same | ||
| Michael Mezhirov, Bridgeport, Conn. (US); Eshan B. Yeh, West Hartford, Conn. (US); and Richard Sale, Tolland, Conn. (US) | ||
| Assigned to 3M Innovative Properties Company, Saint Paul, Minn. (US) | ||
| Filed on Oct. 13, 2005, as Appl. No. 11/250,134. | ||
| Claims priority of provisional application 60/618522, filed on Oct. 13, 2004. | ||
| Prior Publication US 2006/0076288 A1, Apr. 13, 2006 | ||
| Int. Cl. B01D 39/00 (2006.01); B01D 67/00 (2006.01) | ||
| U.S. Cl. 264—48 [264/49; 210/500.41; 210/490] | 14 Claims |
| 1. A method of manufacturing hydrophilic polyethersulfone (PES) membrane comprising the acts of:
providing hydrophobic PES membrane;
prewetting the hydrophobic PES membrane in an amount of a liquid having a low surface tension;
exposing the wet hydrophobic PES membrane to an amount of an aqueous solution of oxidizer;
after the exposing act, heating the hydrophobic PES membrane at a predetermined temperature;
during the heating act, operatively positioning the PES membrane in a saturated water steam medium; and
continuously moving the PES membrane through the saturated water steam medium.
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