Liquid purification or separation – Filter – Supported – shaped or superimposed formed mediums
Patent
1975-04-30
1976-05-18
Anderson, Philip
Liquid purification or separation
Filter
Supported, shaped or superimposed formed mediums
210500M, 210 31C, 260 25M, 260 304R, 260 312R, 260 312XA, 260 334R, 264 41, 264 13, 264 464, 264 49, B01D 3904, B29D 2704
Patent
active
039576515
ABSTRACT:
Microporous membrane filters composed of polyesters derived from aromatic dibasic acids and especially polytetramethylene terephthalate are produced. These membranes are produced by a polymer assisted phase inversion process involving casting a solution of the polyester and assisting polymer to form a film, evaporating the solvent to form a membrane having inchoate micropores filled with the assisting polymer and subsequently at least partially leaching out the assiting polymer.
REFERENCES:
patent: 3423491 (1969-01-01), McLain et al.
patent: 3654065 (1972-04-01), Dorogi
patent: 3674719 (1972-07-01), Jenkins
patent: 3682846 (1972-08-01), Sano et al.
patent: 3744642 (1973-07-01), Scala et al.
patent: 3822202 (1974-07-01), Hoehn
patent: 3877978 (1975-04-01), Kremen et al.
carothers, Wallace H. and J. A. Arvin "Studies on Polymerization and Ring Formation, II Poly-Esters," in Journal of the American Chemical Society, Vol. 51, Aug. 1929, pp. 2560-2570.
Kesting, Robert E. "Synthetic Polymeric Membranes," New York, McGraw-Hill, 1971, pp. 94, 95, 116-157.
Anderson Philip
Chemical Systems Incorporated
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