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Tamper indicating labels

  • US 4,121,003 A
  • Filed: 04/22/1977
  • Issued: 10/17/1978
  • Est. Priority Date: 04/22/1977
  • Status: Expired due to Term
First Claim
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1. A laminated label comprising:

  • (a) a flexible transparent or translucent plastic film, having reverse printed one side thereof a disruptable information containing pattern printed in an ink which ink is not fully dried or cured to a high cohesive integral film, and(b) a layer of pressure sensitive adhesive bonded to the printed side of said plastic film,the plastic film, the disruptable pattern, and the adhesive layer having relative affinities such that the affinity of the adhesive layer for the substrate to which it is applied, the affinity of the adhesive layer for the disruptable ink pattern, the affinity of the disruptable ink for the plastic film, the affinity of the disruptable ink for any conventional ink separating the disruptable ink from the adhesive layer or the cohesive strength of the adhesive layer all being greater than the cohesive strength of the disruptable pattern, withthe adhesive layer being formed from an adhesive which has at least one of the following characteristics;

    (i) an adhesive which has an affinity for the surface to which the laminated label is adhered which is greater than the cohesive force of the adhesive layer,(ii) an adhesive which has an affinity for the surface to which the laminated label is adhered greater than the affinity of the adhesive layer for said plastic film,so that when the laminated label has been mounted on an object, attempted removal causes delamination of the label with at least a tamper indicating amount of the disruptable printed pattern remaining adhered to at least a portion of the pressure sensitive adhesive which remains on the object.

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