Stock material or miscellaneous articles – Composite – Of polyimide
Patent
1997-02-21
1998-09-22
Cain, Edward J.
Stock material or miscellaneous articles
Composite
Of polyimide
428412, 428413, 428419, 428421, 4284744, B32B 2700
Patent
active
058111964
ABSTRACT:
A laminated asymmetric membrane comprising first and second asymmetric membranes having different molecular structures, in which the first and second asymmetric membranes are laminated. Consequently, the laminated asymmetric membrane having the excellent property of the separation and permeability can be provided at a low cost. The laminated asymmetric membranes of the present invention is manufactured by the following steps: a film-forming dope (1) was prepared by synthesizing fluorine-containing polyimide having a repeating unit expressed by the following Chemical Formula by using diethylene glycol dimethyl ether as a solvent; a film-forming dope (2) was prepared by dissolving polysulfone in diethylene glycol dimethyl ether; the dope (2) from the resulted two dopes was cast on a polyester nonwoven cloth to a thickness of approximately 50 .mu.m by means of an applicator; the dope (1) was lap coated thereon to a thickness of 30 .mu.m; the dope (2) on which the dope (1) is coated was dipped in water as a solidifying solution at a temperature of 25.degree. C. for 5 minutes and in a water at a temperature of 20.degree. C. for one hour, thus forming a laminated asymmetric membrane.
Chemical Formula ##STR1##
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Hachisuka Hisao
Ikeda Kenichi
Cain Edward J.
Nitto Denko Corporation
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