Dispersing casting of integral skinned highly asymmetric polymer

Details Dispersing casting of integral skinned highly asymmetric polymer Dispersing casting of integral skinned highly asymmetric polymer

1986-11-19

1988-09-27

Spear, Frank

Plastic and nonmetallic article shaping or treating: processes

Pore forming in situ

21050034, 21050038, 2105004, 21050043, 21050041, B29D 2700

Patent

active

047740396

ABSTRACT:
There is disclosed, in one aspect, an improved highly asymmetric membrane comprising a skin and a porous asymmetric support. The skin contains pores which have an mean pore diameter of from about 0.005 to about 3.0 microns and the asymmetric support comprises a reticulated structure which contains pores which have pore diameters of from about 10 to about 20,000 times as large as the pore diameter of the pores of the skin. The membrane has a bulk porosity greater than about 70%. In another aspect, there is disclosed a process for preparing these membranes. This process comprises casting a polymer dope while the dope is in an unstable liquid dispersion condition. The concentration of polymer in the polymer dope should be high enough to produce a coherent membrane yet low enough to form a substantially all-reticulated structure within the asymmetric support. The membranes are characterized by high flow rates, excellent retention properties, and improved resistance to fouling.

REFERENCES:
patent: 3615024 (1971-10-01), Michaels
patent: 3883626 (1975-05-01), Kamide et al.
patent: 3998245 (1976-10-01), Wang
patent: 4340479 (1982-07-01), Pall
Kock, K., "Unter Suchungen uber den Bildungsmechanismus Asymmetricher Membranen fur die Umgekehrte Osmose" (1975).
Sartorius Laboratory Catalog, p. 91.
Amicon Catalog, Jan. 1977, p. 6.
Brock, Membrane Filtration, 1983 (sic.) p. 55.
ASTM F-316-70.
"Research and Development Progress Report No. 359", Oct. 1968, p. 37-43.
Marshall, J. C. et al., "Certain Porosity Aspects of Membrane Filters: Their Pore-Distribution and Anisotrophy", p. 214-219, 4-76.

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