Stock material or miscellaneous articles – Sheet including cover or casing – Foamed or expanded material encased
Patent
1996-10-25
1999-03-30
Achutamurthy, Ponnathapura
Stock material or miscellaneous articles
Sheet including cover or casing
Foamed or expanded material encased
21050041, 428215, 4283188, 4283193, B32B 300, B32B 702, B32B 520, B01D 3900
Patent
active
058886052
ABSTRACT:
The semipermeable membrane of polysulfone resin is formed of a continuous structure of a homogeneous skin layer part having an average thickness of 5 to 1000 nm and a porous layer which is made of the same material as that of the homogeneous skin layer and is thicker than the homogeneous skin layer, and the porous layer is formed of a structure having voids having an average pore diameter less than 3 .mu.m. Therefore, a gas separation membrane that has high permeation flux and requires practically satisfactory cost can be provided. Diethylene glycol dimethyl ether was added to polysulfone for dissolution, and the resultant solution was defoamed for preparation. The solution was cast on a support layer of polyester non-woven fabric using an applicator, dipped in water as a solidifying liquid, and dried. As a result, a semipermeable membrane comprising a homogeneous skin layer part and a porous layer is obtained. A crosslinking silicone resin solution may be applied to the surface of the membrane to form a protective film.
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Fritzsche, et al., "Polysulfone Hollow Fiber Membranes Spun from Aliphatic Acid (C.sub.2 -C.sub.4): N-Methylpyrrollidone Complexes --Structure Determination by Oxygen Plasma Ablation", Journal of Applied Polymer Science, vol. 41 (1990) pp. 713-733.
Hachisuka Hisao
Ikeda Kenichi
Achutamurthy Ponnathapura
Nitto Denko Corporation
Park Hankyel T.
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