Microporous film containing water swellable fillers

C - Chemistry – Metallurgy – 08 – J

Patent

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Details

C08J 5/18 (2006.01) A61F 13/15 (2006.01) B32B 3/26 (2006.01) B32B 27/20 (2006.01) C08K 3/34 (2006.01) C08K 11/00 (2006.01) C08L 101/00 (2006.01) D06M 15/00 (2006.01)

Patent

CA 2308283

A self-regulating breathable microporous film layer transmits water vapor at normal use conditions, and reduces or eliminates the vapor transmission when the vapor in the environment become excessive. The film layer includes a voided polymer matrix and a plurality of fine water-swellable filler particles disposed within the voids. When there is an excess of vapor, the filler particles swell to block or partially block transmission of vapor through the voids and the film layer.

L'invention porte sur une couche de film microporeux imper-respirant, à auto-régulation qui transmet la vapeur d'eau dans des conditions normales d'utilisation, et réduit ou élimine la transmission de vapeur lorsque celle-ci devient trop importante dans l'environnement. La couche de film comprend une matrice polymère creuse et une pluralité de fines particules hydrogonflantes constituant une charge, ces particules étant disposées dans les creux. Lorsqu'il y a un excès de vapeur, les particules de la charge gonflent de façon à bloquer totalement ou partiellement la transmission de vapeur dans les creux et dans la couche de film.

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