Porous membrane for fuel cell electrolyte membrane and...

H - Electricity – 01 – M

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H01M 8/02 (2006.01) B32B 5/18 (2006.01) B32B 27/30 (2006.01) C08J 9/00 (2006.01) H01M 8/10 (2006.01)

Patent

CA 2654921

To obtain a porous membrane for a fuel cell electrolyte membrane, having mechanical property which is equal in the longitudinal and lateral directions. A porous membrane 10 is formed in such a way that porous resin sheets 1a and 1b which are obtained by uniaxially stretching a polytetrafluoroethylene thin membrane and which have strength anisotropy in orthogonal two directions, are mutually laminated in a state where the directions in which the strength of the porous resin sheets is large are made to cross each other, and that the laminated porous resin sheets are integrally bonded by means of heat fusion, or the like.

L'invention concerne un film poreux pour une utilisation en tant que film d'électrolyte dans des piles à combustible. Dans le film, des propriétés mécaniques dans la direction de la longueur sont égales à celles dans la direction de la largeur. Des feuilles de résine poreuses (1a, 1b) qui sont chacune obtenues par l'étirement uniaxial d'un film de polytétrafluoroéthylène mince et ont une anisotropie de résistance dans deux directions perpendiculaires sont superposées de telle sorte que les directions de résistance la plus élevée pour les feuilles respectives se croisent les unes,les autres. Les feuilles de résine poreuses superposées sont unies les unes avec les autres, par exemple, par fusion thermique. Ainsi, le film poreux (10) est formé.

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