Tamper evident adhesive and identification document including same
AssigneeL-1 Secure Credentialing, Inc.
InventorsRobert L. Jones, Daoshen Bi, Tung-Feng Yeh
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Abstract
A composition is provided for adhering a first article to a second article, the composition comprising a thermally active low Tg polymeric resin; and a multifunctional crystalline polymer. The thermally active low Tg polymeric resin can, for example, comprise 50-99% of the composition. The multifunctional crystalline polymer can, for example, comprise 1-50% of the composition. In one embodiment, the multifunctional crystalline polymer comprises 5-20% by weight of the composition. In one embodiment, the multifunctional crystalline polymer has a low molecular weight.
Claims21
A composition for adhering a first polymer laminate layer to a second polymer laminate layer, the composition comprising:
- a thermally active polymeric resin;
- and
- a multifunctional crystalline polymer, wherein the composition maintains adhesion between the first and second polymer layers above a temperature at which a plurality of crystals form within the multifunctional crystalline polymer;
- wherein the composition forms a plurality of crystals that provide visible evidence of tampering with the adhesion formed between the first and second polymer layers when heated at a temperature above a predetermined temperature.
An identification document, comprising:
- an information-bearing layer;
- an adhesive layer overlaying at least a portion of the information-bearing layer, the adhesive layer comprising a thermally active low Tg polymeric resin and a multifunctional crystalline polymer;
- and
- a protective layer coupled to the information-bearing layer via the adhesive layer, wherein the adhesive layer is constructed and arranged such that subjecting the identification document to a temperature above a predetermined temperature causes a plurality of crystals to form in the adhesive layer.
An identification document, comprising:
- an information-bearing layer;
- an adhesive layer overlaying at least a portion of the information-bearing layer, the adhesive layer comprising a thermally active polymeric resin and a multifunctional crystalline polymer;
- and
- a protective layer coupled to the information-bearing layer via the adhesive layer, wherein the adhesive layer is constructed and arranged such that subjecting the identification document to a temperature above a predetermined temperature causes a plurality of crystals to form in the adhesive layer.
A laminate for a document comprising:
- an outer-laminate layer;
- and
- an adhesive layer including a thermally active polymeric resin, and
- a multifunctional crystalline polymer;
- wherein the adhesive layer maintains adhesion between the outer-laminate layer and an information bearing document layer above a temperature at which a plurality of crystals form within the multifunctional crystalline polymer:
- and wherein subjecting the laminate to a temperature above a predetermined temperature causes a plurality of crystals to form in the adhesive layer.
Dependencies are inferred from the claim text.