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United States Patent | 3,593,855 |
Stana | July 20, 1971 |
A semipermeable membrane containing a supportive layer and a lipid containing osmotic skin layer of polymeric film forming cellulosic material is made by (1) admixing film forming cellulosic material, solvent, swelling additive and lipid to provide a casting solution (2) casting a film from the solution (3) drying the film (4) leaching the film to form a semipermeable osmotic skin membrane containing a residue of lipid, and (5) optionally curing the membrane.
Inventors: | Stana; Regis R. (Pittsburgh, PA) |
Assignee: |
Westinghouse Electric Corporation
(Pittsburgh,
PA)
|
Appl. No.: | 04/824,115 |
Filed: | May 13, 1969 |
Current U.S. Class: | 210/500.27 ; 210/500.23; 210/500.29; 210/500.3 |
Current International Class: | B01D 39/00 (20060101); C08L 1/08 (20060101); C08L 1/00 (20060101); B01d 039/00 (); B01d 013/00 () |
Field of Search: | 210/22,23,321,500 |
3276996 | October 1966 | Lazare |
3423491 | January 1969 | McLain et al. |
3483282 | December 1969 | Manjkian |