Breathable extruded polymer films

B - Operations – Transporting – 32 – B

Patent

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B32B 5/18 (2006.01) A61F 13/15 (2006.01) B32B 27/12 (2006.01) B32B 27/20 (2006.01) C08K 3/00 (2006.01)

Patent

CA 2319007

A polymer film comprising at least first and second contiguous and coextruded portions, wherein the first portion is extruded from a first polymer composition containing a filler material in an amount sufficient to increase the water vapor permeability of the first portion relative to the second portion, and the second portion is extruded from a second polymer composition such that a tensile strength of the second portion is greater than the tensile strength of the first portion. Such polymer films allow for highly vapor permeability, while providing portions with sufficient strength to allow for taping or attachment of fastening devices.

L'invention concerne un film polymère comprenant au moins une première et une seconde partie coextrudée contiguë, dans lequel la première partie est extrudée à partir d'une première composition polymère contenant un matériau d'apport en quantité suffisante pour augmenter la perméabilité à la vapeur d'eau de la première partie par rapport à la seconde partie, et dans lequel la seconde partie est extrudée à partir d'une seconde composition polymère, de sorte que la résistance à la traction de la seconde partie est supérieure à la résistance à la traction de la première partie. Ces films polymères fournissent une perméabilité à la vapeur élevée, tout en comprenant des parties suffisamment résistantes pour permettre le rubanage ou la fixation de dispositifs d'attache.

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