Transparent multilayer film and its use for protection of...

G - Physics – 09 – F

Patent

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Details

G09F 3/02 (2006.01) B42D 15/10 (2006.01)

Patent

CA 2194454

The invention provides a transparent multilayer film comprising a cover layer, a destructible or irreversibly deformable layer, respectively, a pattern of adhesion-regulating material between the cover layer and the damageable layer, and an adhesive layer for bonding with a substrate. The damageable layer has a thickness of at least 10 µm. The following relationship applies to the cohesive strength as well as the adhesion between the layers: a, d > c > b, whereby a) is the adhesive strength between cover layer (1) and layer (3) in the areas where no adhesion-regulating material (2) is present, b) is the adhesive strength between cover layer (1) and layer (3), in the areas where adhesion-regulating material (2) is present, c) is the cohesive strength of layer (3), and d) is the adhesive strength between layer (3) and adhesive layer (5). The invention also provides for the use of the transparent multilayer film for protection of data on documents, as well as its use as a tamper-proof label. The invention also provides for a tamper-proof document or label, comprising a multilayer film of the present invention.

L'invention porte sur une pellicule multicouche transparente comprenant une couche de couverture, une couche destructible ou déformation ou irréversible séparées par un motif d'un matériau conditionnant l'adhérence, et une couche adhésive pour la fixation à un substrat. La couche destructible présente une épaisseur d'au moins 10 µm et la relation suivante a, d > c > d s'applique aux forces de cohésion et d'adhérence entre couches, relation dans laquelle: a) représente la force d'adhérence entre la couche de couverture (1) et la couche (3) dans les zones exemptes de matériau (2) conditionnant l'adhérence; b) représente la force d'adhérence entre la couche de couverture (1) et la couche (3) dans les zones pourvues de matériau (2) conditionnant l'adhérence; c) représente la force de cohésion de la couche (3); et d) représente la force d'adhérence entre la couche (3) et la couche adhésive (5). L'invention porte également sur l'utilisation d'une pellicule multicouche transparente pour protéger des données contenues dans un document et comme étiquette inviolable, ainsi que sur des documents ou étiquettes inviolables recourant à la pellicule objet de l'invention.

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