Plastic and nonmetallic article shaping or treating: processes – Pore forming in situ
Patent
1974-08-08
1976-07-13
Anderson, Philip
Plastic and nonmetallic article shaping or treating: processes
Pore forming in situ
210 23H, 210500M, 264317, 264DIG44, B29D 2704, B29C 106, B01D 1300, B01D 3916
Patent
active
039694526
ABSTRACT:
A method of casting ultra-thin semipermeable membranes comprises the steps of: (A) applying a coating of a film forming water soluble solution, containing a leachable pore producing agent and a polymer which is not substantially degraded by organic polar solvents, onto a smooth casting surface, (B) drying the coating to form a support film about 0.5-10 mils thick, (C) applying a coating of an organic polymeric membrane coating solution onto the support film, and drying the coating to form a semipermeable reverse osmosis membrane film about 0.01-1.0 mil thick and (D) applying a leaching liquid to the films, to cause pore formation in the support film and to form a composite consisting of a 0.01-1.0 mil thick semipermeable membrane, supported by a 0.5-10 mils thick water soluble film support of between about 5-50% porosity.
REFERENCES:
patent: 2707201 (1955-04-01), Fernald et al.
patent: 2894289 (1959-07-01), Harper et al.
patent: 3424824 (1969-01-01), Harbard et al.
patent: 3514313 (1970-05-01), Martel et al.
patent: 3544358 (1970-12-01), Manjikian
patent: 3616520 (1971-11-01), Bucalo
patent: 3791526 (1974-12-01), Stana et al.
patent: 3836423 (1974-09-01), Wagner et al.
U.S. Office of Saline Water, "Second Report on Fabrication and Evaluation of New Ultrathin Reverse Osmosis Membranes," by P. S. Francis and J. E. Calotte, Research and Development Progress Report No. 247, Apr. 1967, Washington, D.C., U.S. Dept. Of Interior, pp. 6-16.
U.S. Office of Saline Water, "Reverse Osmosis Membrane Research," by U. Merten, H. K. Lonsdale, R. L. Riley and K. D. Vos, Research and Development Progress Report No. 265, Aug. 1967, Washington, D.C., U.S. Dept. of Interior, pp. 57-80.
Ciliberti David F.
Scala Luciano C.
Anderson Philip
Fraser Donald R.
The United States of America as represented by the Secretary of
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