Elastic film

C - Chemistry – Metallurgy – 08 – J

Patent

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Details

C08J 5/18 (2006.01) B32B 25/00 (2006.01) B32B 27/32 (2006.01) A61J 1/00 (2006.01)

Patent

CA 2407106

The invention relates to an elastic, substantially non-stretched film produced from olefinic materials that is completely free of PVC and that is yet adapted to the requirements of a film, such as a film for medical purposes, for example for heat sterilization. The inventive film has elastic properties up to a certain point that depend on the film's thickness, that means no permanent deformation can be observed. When the tensile stress is further increased, the film is deformed, that is it shows a plastic behavior until it finally tears or breaks. The transition is fluid since, unlike conventional films, the inventive film has no negative increase in the yield point. The increase in the yield point is >= 0. The invention further relates to the use of the inventive films, for example in the field of medical engineering, and to bags for medical purposes that comprise at least one film according to the invention.

L'invention concerne un film élastique, qui n'est pratiquement pas étiré, et constitué de matériaux oléfiniques. Ce film, bien que totalement exempt de PVC, satisfait aux exigences d'un film médical, par exemple pour la stérilisation à chaud. Ce film présente des propriétés élastiques jusqu'à un certain point dépendant de l'épaisseur du film, c'est-à-dire qu'il n'apparaît aucune déformation permanente. Lorsque la contrainte de traction augmente, il se produit une déformation, c'est-à-dire que le film présente un comportement plastique, jusqu'à l'apparition d'une fissure ou d'une rupture. La transition s'effectue de manière continue car, à la différence de la technique antérieure, il n'apparaît pas de pente négative à la limite élastique. La pente est supérieure ou égale à zéro à la limite élastique ou à la limite d'étirage. L'invention concerne en outre l'utilisation desdits films, par exemple en technique médicale, ainsi que des sachets médicaux contenant au moins un desdits films.

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