Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Cellular products or processes of preparing a cellular...
Patent
1996-05-29
1998-01-13
Cooney, Jr., John M.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Cellular products or processes of preparing a cellular...
21050029, 21050035, 21050038, 21050039, 2105004, 21050041, 21050042, 21050043, 264 41, 264 50, 264 83, 264212, 264310, 521 88, 521 89, 521142, 521145, 521146, 521147, 521149, 521180, 521189, C08J 928, B01D 3914, B29C 6500
Patent
active
057080402
ABSTRACT:
The present invention describes a method for preparing an asymmetric porous membrane by a dry-wet phase inversion method, which comprises contacting a cast or spun polymer solution with water or organic vapor prior to immersing into the non-solvent precipitation medium, whereby said water or organic vapor is adsorbed onto the cast or spun polymer solution. Higher permeability and excellent rejection ability can be obtained, due to the high porosity and uniform pore size of said membranes according to the present invention.
REFERENCES:
patent: 3133132 (1964-05-01), Loeb et al.
patent: 4046843 (1977-09-01), Sano et al.
patent: 4794002 (1988-12-01), Henis et al.
patent: 4894159 (1990-01-01), Guiver et al.
Journal of Membrane Science, vol. 65, pp. 231-246, 1992, Philip Radovanovic, et al., "Formation Of Asymmetric Polysulfone Membranes By Immersion Precipitation. Part II. The Effects Of Casting Solution And Gelation Bath Compositions On Membrane Structure And Skin Formation".
Journal of Membrane Science, vol. 22, pp. 199-215, 1985, p. Aptel, et al., "Polysulfone Hollow Fibers-Effect Of Spinning Conditions On Ultrafiltration Properties".
Ahn Kyu Hong
Ha Seong Ryong
Hong Jae Min
Kang Yong Soo
Park Hyun Chae
Cooney Jr. John M.
Korea Institute of Science and Technology
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