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Transparent multilayer film and its use for protection of data on documents as well as a tamper-proof label

  • US 5,629,093 A
  • Filed: 07/06/1995
  • Issued: 05/13/1997
  • Est. Priority Date: 07/08/1994
  • Status: Expired due to Fees
First Claim
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1. Transparent multilayer film, comprising a cover layer, a damagable layer, a pattern of adhesion-regulating material between said layers, and a first adhesive layer on the side of the film opposite that of the cover layer, for bonding with a substrate, characterized in that damagable layer (3) has a thickness of at least 10 μ

  • m and that the cohesive strength of the damagable layer (3) and the adhesive strength between the layers obeys the following relationship;

    a and d>

    c>

    bwherebya is the adhesive strength between cover layer (1) and damagable layer (3) in the areas where no adhesion-regulating material (2) is present,b is the adhesive strength between cover layer (1) and damagable layer (3), in the areas where adhesion-regulating material (2) is present,c is the cohesive strength of damagable layer (3), andd is the adhesive strength between layer (3) and first adhesive layer (5).

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