Heat-resistant film and composite ion-exchange membrane

B - Operations – Transporting – 29 – C

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B29C 41/24 (2006.01) B29C 39/18 (2006.01) B29D 7/01 (2006.01) C08J 5/18 (2006.01) C08J 9/26 (2006.01) H01B 1/06 (2006.01) H01B 1/12 (2006.01) H01M 8/02 (2006.01)

Patent

CA 2503433

A heat-resistant film comprising at least any one of a polybenzazole, aramid, and polyamide-imide, which is produced by sandwiching a polymer solution between at least two supports, forming the solution into a thin film by means of rolls, a slit, or a press, introducing the film to a coagulating bath, and removing the supports in the coagulating bath to coagulate the film; and a composite ion-exchange membrane comprising a composite layer comprising the film impregnated with an ion-exchange resin and, formed on each side of the composite layer, a surface layer which comprises an ion-exchange resin and includes no porous film. The heat-resistant film is excellent in all of heat resistance, mechanical strength, surface smoothness, and interlaminar peeling resistance and, in particular, has micropores. The composite ion-exchange membrane, which employs this heat-resistant film, has excellent ion conductivity.

L'invention concerne un film thermorésistant qui renferme au moins un élément parmi un polybenzazole, un aramide, et un polyamide-imide et qu'on produit en plaçant une solution polymère entre au moins deux supports, en formant la solution en un film mince à l'aide de rouleaux, d'une fente ou d'une presse, en introduisant le film dans un bain de coagulation et en éliminant les supports dudit bain pour faire coaguler le film. Cette invention a aussi trait à une membrane d'échange ionique composite qui comprend une couche composite pourvue du film imprégné d'une résine d'échange ionique et formée sur chaque côté de ladite couche composite, une couche de surface qui renferme une résine d'échange ionique et un film non poreux. Ce film thermorésistant présente d'excellentes caractéristiques en matière de thermorésistance, de résistance mécanique, de lissé, et de résistance au pelage interlaminaire. En outre, il possède des micropores. Cette membrane d'échange ionique composite utilisant ledit film thermorésistant possède une excellente conductivité ionique.

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