Importance

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Abstract

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 damagable layer, and an adhesive layer for bonding with a substrate. The damagable layer has a thickness of at least 10 .mu.m. The following relationship applies to the cohesive strength as well as the adhesion between the layers: a and 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 tamperproof document or label, comprising a multilayer film of the present invention.

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First Claim