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(12) Ullltfild States Patent (10) Patent No.: US 8,011,517 B2 Allen et al. (45) Date of Patent: Sep. 6, 2011 (54) COMPOSITE MEMBRANES WITH 5,041,225 A * 8/1991 Norman ................. .. 210/500.36 PERFORMANCE ENHANCING LAYERS 5,510,394 A * 4/1996 Hqdgden 521/27 5,512,205 A * 4/1996 La1 ......................... .. 252/182.14 . 5,998,200 A 12/1999 B tu t l. (75) Inventors: Robert David Allen, San Jose, CA (US); 6,083,393 A ,,, 7/2000 vfungrilfi “““ “ 210/500,35 James Lupton Hedrick, Pleasanton, CA 6,551,536 B1 4/2003 Kwak et 31, (US); Young-Hye Na, San Jose, CA 6,569,932 B2 5/2003 Hsiao et al. (US); Alshakim Nelson, Fremont, CA 7,067,606 B2 * 6/2006 Malher et a1~ (US); Remem S""“Yek"m="=mi San 3:36:33? 33- 55883 331132213‘. '111111111111'515‘/£38.13 1°59 CA (US) 7,381,471 B2 6/2008 Augustine G1 al. 7,572,872 B2 8/2009 Flodin et al. (73) Assignee International Business Machines 7,604,746 B2* 10/2009 Childs et al. ................ .. 210/640 ~m@W<US> 522;/212211121 12/522; 1 es et a . ( * ) Notice: Subject to any disclaimer, the term of tl1is 2008/0214694 Al 9/2008 Yokota et 31' patent is extended or adjusted under 35 FQREIGN PATENT DQCUMENTS U~S~C~ 154(6) 63’ 0 daYs~ AU 200157746 A1 2/2003 CN 1401417 A 3/2003 (21) Appl. No 12/624,633 EP 1283 068 A1 2/2003 C t' d (22) Filed: Nov. 24, 2009 ( °n “me ) (65) Prior Publication Data OTHER PUBLICATIONS Us 2011/0120941 A1 May 26, 2011 Fang Yao et al., “Antibacterial effect of surface-funcltionalized polypropylene hollow fiber membrane from surface-1n1t1ated atom (51) Int CL transfer radical polymerization,”,/ournal of Membrane Science, 319 B01D 29/00 (2006.01) (2008) 149-151 B01D 29/46 (2006.01) (Continued) B01D 39/00 (2006.01) B01D 67/00 (2006.01) P _ E _ An MP rt (52) U.S. C1. ............ .. 210/490; 210/500.27; 210/500.35; ””"”y "””””” Z *‘_ ° ‘ma _ 264/48 (74) Attorney, Agent, or Firm — Shumaker & Sieffert, P.A. (58) Field of Classification Search ........... .. 210/500.27, 210/500.35, 490, 645, 502.1, 500.42; 428/304.4; (57) ABSTRACT S 1. t. fil f ?5t/4575211 191.6/t4; 264/48 A composite membrane includes a filtration membrane with ee app lea Ion e or Comp e e Seam ls my a surface; and a layer on the surface of the filtration mem(56) References Cited brane. The layer includes a polymer including a poly(ethyl
4,056,456 A * 11/1977 Sano etal. .................. .. 204/165 4,970,034 A * 11/1990 Ly et al. ..................... .. 264/46.4
ene glycol) moiety cross-lir1ked with an ammonium salt or a precursor of an ammonium salt.
11 Claims, 6 Drawing Sheets
FR 2 843 045 A1 2/2004 GB 2 390 042 A 12/2003 JP 2003-053163 2/2003 JP 2004-025102 1/2004
WO WO 2007/052260 A2 5/2007
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