Liquid impermeable, moisture vapour permeable layers and...

C - Chemistry – Metallurgy – 08 – J

Patent

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C08J 5/18 (2006.01) B32B 27/22 (2006.01)

Patent

CA 2481575

The present invention relates to liquid impermeable, moisture vapour permeable film or layers comprising thermoplastic hydrophilic polymeric compositions. The thermoplastic compositions comprise selected thermoplastic hydrophilic polymers, selected compatible plasticisers, and selected functionalized copolymers that provide the resulting film or layer with an increased mechanical strength, and better bonding capability to a substrate, without impairing the moisture vapour permeability of said films or layers. The layers and films of the present invention made from the thermoplastic hydrophilic polymeric compositions can find a variety of applications wherein liquid imperviousness and moisture vapour permeability are desirable.

La présente invention concerne des couches ou films imperméables aux liquides et perméables à la vapeur d'eau et comprenant des compositions polymères hydrophiles thermoplastiques. Ces compositions thermoplastiques comprennent des polymères hydrophiles thermoplastiques choisis, des plastifiants compatibles choisis, et des copolymères fonctionnalisés choisis qui confèrent à la couche ou au film résultant une résistance mécanique accrue, et une meilleure aptitude à se lier à un substrat, sans nuire à la perméabilité à la vapeur d'eau de ces films ou couches. Les couches et films de la présente invention, à base de compositions polymères hydrophiles thermoplastiques, conviennent à diverses applications demandant l'imperméabilité aux liquides et la perméabilité à la vapeur d'eau.

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