Tamper evident adhesive and identification document including same

• US 7,963,449 B2
• Filed: 06/24/2010
• Issued: 06/21/2011
• Est. Priority Date: 03/11/2004
• Status: Active Grant

• Current Assignee: L-1 Secure Credentialing, LLC (Advent International Corporation)
• Original Assignee: L-1 Secure Credentialing, LLC (Advent International Corporation)
• Inventors: Yeh, Tung-Feng, Bi, Daoshen, Jones, Robert L.
• Primary Examiner(s): Labaze; Edwyn
• Application Number:
  US12/822,746
• Publication Number:
  US 20110045255A1
• Time in Patent Office: 362 Days
• Field of Search: 235/487, 235/380, 235/375, 235/488, 428/347
• US Class Current: 235/487
• CPC Class Codes: B42D 25/00 Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof printing processes to produce identification or security features B41M3/14
• CPC Class Codes: B42D 25/23 Identity cards
• CPC Class Codes: B42D 25/455 using heat
• CPC Class Codes: B42D 25/465 using chemicals or adhesives
• CPC Class Codes: B42D 25/47 using adhesives
• CPC Class Codes: C09J 11/08 Macromolecular additives
• CPC Class Codes: C09J 2203/338 as tamper-evident tape or label
• CPC Class Codes: C09J 2431/00 Presence of polyvinyl acetate
• CPC Class Codes: C09J 2433/00 Presence of (meth)acrylic polymer
• CPC Class Codes: C09J 2467/00 Presence of polyester
• CPC Class Codes: C09J 2475/00 Presence of polyurethane
• CPC Class Codes: C09J 7/38 Pressure-sensitive adhesives [PSA]
• CPC Class Codes: C09J 9/00 Adhesives characterised by their physical nature or the effects produced, e.g. glue sticks C09J7/00 takes precedence
• CPC Class Codes: G06K 19/00 Record carriers for use with machines and with at least a part designed to carry digital markings
• CPC Class Codes: Y10T 428/24802 Discontinuous or differential coating, impregnation or bond [e.g., artwork, printing, retouched photograph, etc.]

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.

Claims

1. 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;

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;

wherein the crystal formation is substantially irreversible; and

,

wherein the crystals are visible to an unaided human eye.

2. The composition of claim 1, wherein the multifunctional crystalline polymer has a low molecular weight.

3. The composition of claim 1, wherein the predetermined temperature is a temperature lower than a standard lamination temperature.

4. The composition of claim 1, wherein the predetermined temperature is about 220 degrees Fahrenheit.

5. The composition of claim 1, wherein the crystals have a “

snow flake”

like appearance.

6. The identification document of claim 1;

wherein the thermally active lot Tg polymeric resin comprises 50-99% of the adhesive layer.

7. The identification document of claim 1, wherein the multifunctional crystalline polymer comprises 1-50% of the adhesive layer.

8. The identification document of claim 1, wherein the multifunctional crystalline polymer comprises 5-20% by weight of the adhesive layer.

9. The identification document of claim 1, wherein the thermally active low Tg polymeric resin comprises at least one of a high molecular weight low Tg linear amorphous polyester, a polymeric plasticizer, VITEL 3650, polyacrylate, polyethylene vinylacrylate, polyester, and polyurethane.

10. The identification document of claim 1, wherein the multifunctional crystalline polymer comprises at least one of a di-functional polyester, a tri-functional polyester, a multi-functional polyester, polypropylene, polyamide, acetal, high density polyethylene, and VITEL 5833.