Liquid purification or separation – Filter – Material
Patent
1985-07-10
1987-04-21
Anderson, Philip
Liquid purification or separation
Filter
Material
21050032, 264 41, 264 455, 264 48, 264237, 264348, 521 51, C08J 928, C08J 934, B29C 3938
Patent
active
046594701
ABSTRACT:
A method for providing anisotropic polymer membranes from a binary polymer/solvent solution using a thermal inversion process. A homogeneous binary solution is cast onto a support and cooled in such a way as to provide a differential in cooling rate across the thickness of the resulting membrane sheet. Isotropic or anisotropic structures of selected porosities can be produced, depending on the initial concentration of polymer in the selected solvent and on the extent of the differential in cooling rate. This differential results in a corresponding gradation in pore size. The method may be modified to provide a working skin by applying a rapid, high-temperature pulse to redissolve a predetermined thickness of the membrane at one of its faces and then freezing the entire structure.
REFERENCES:
patent: 3945926 (1976-03-01), Kesting
patent: 4035459 (1977-07-01), Kesting
patent: 4247498 (1981-01-01), Castro
patent: 4264447 (1981-04-01), Nicolet
patent: 4333972 (1982-06-01), Kesting
patent: 4387024 (1983-06-01), Kurihara et al.
Caneba Gerard T. M.
Soong David S.
Anderson Philip
Dixon Harold M.
Gaither Roger S.
Hightower Judson R.
The United States of America as represented by the United States
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