Durable, tamper resistant security laminate

• US 5,683,774 A
• Filed: 02/16/1996
• Issued: 11/04/1997
• Est. Priority Date: 12/09/1994
• Status: Expired due to Fees

• Current Assignee: Minnesota Mining and Manufacturing Co (3M Company)
• Original Assignee: Minnesota Mining and Manufacturing Co (3M Company)
• Inventors: Fossum, Douglas K., Faykish, Lynn E.
• Primary Examiner(s): Dye, Rena
• Application Number:
  US08/602,638
• Time in Patent Office: 627 Days
• Field of Search: 428/40.1, 428/43, 428/349, 428/483, 428/916, 428/915, 428/41.7, 428/41.8, 428/41.9, 428/214, 428/42.1, 428/195, 428/201, 428/41.1, 428/202, 428/480, 428/516, 283/72, 283/81, 283/101, 283/107, 283/108, 283/109, 283/110, 40/299, 206/807
• US Class Current: 428/40.1
• 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 25/24 Passports
• CPC Class Codes: B42D 25/328 Diffraction gratings; Holograms
• CPC Class Codes: B42D 25/455 using heat
• CPC Class Codes: B42D 25/47 using adhesives
• CPC Class Codes: G03H 1/0011 for security or authentication holograms on information-bearing cards B42D25/328; testing papers with holograms G07D7/0032
• CPC Class Codes: G03H 2240/50 Parameters or numerical values associated with holography, e.g. peel strength
• CPC Class Codes: G03H 2250/12 Special arrangement of layers
• CPC Class Codes: G09F 3/0292 tamper indicating labels
• CPC Class Codes: Y10S 428/915 Fraud or tamper detecting
• CPC Class Codes: Y10T 428/14 Layer or component removable to expose adhesive
• CPC Class Codes: Y10T 428/1471 Protective layer
• CPC Class Codes: Y10T 428/1476 Release layer
• CPC Class Codes: Y10T 428/1486 Ornamental, decorative, pattern, or indicia
• CPC Class Codes: Y10T 428/15 Sheet, web, or layer weakened to permit separation through thickness
• CPC Class Codes: Y10T 428/24851 Intermediate layer is discontinuous or differential
• CPC Class Codes: Y10T 428/2486 with outer strippable or release layer
• CPC Class Codes: Y10T 428/2848 Three or more layers
• CPC Class Codes: Y10T 428/31786 Of polyester [e.g., alkyd, etc.]
• CPC Class Codes: Y10T 428/31913 : Monoolefin polymer

Abstract

A security laminate comprising (1) a protective layer having a first and a second surface, (2) a pattern of low adhesion coating bonded to a portion of the second surface of the protective layer, (3) at least one emblem bonded to a portion of the low adhesion coating/protective layer composite, (4) an adhesive bonded to the emblem layer/low adhesion coating/protective layer composite, and (5) a primer is not included between the low adhesion coating and emblem layers; wherein the bond between the emblem and the protective layer and the bond between the adhesive layer and protective layer are the most tenacious bonds, and the bond between the low adhesion coating and the protective layer is the least tenacious, whereby the emblems and adhesive layers are damaged in the pattern of the low adhesion coating during delamination. Also, secured documents comprising such security laminates and a method for securing documents utilizing such security laminates.

Claims

1. A security laminate comprising:

(a) a protective layer having a major surface,

(b) a patterned low adhesion coating layer bonded to a portion of said major surface,

(c) a discontinuous emblem layer comprising at least one emblem, a portion of which is bonded to the major surface and a portion of which is bonded to the coating layer, and

(d) an adhesive layer bonded to the emblem layer, for bonding the laminate to an object;

wherein the bond between the coating layer and the protective layer is less tenacious than the bond between any other two layers of the laminate, whereby the emblem layer is damaged in the pattern of the low adhesion coating during delamination of the protective layer from the object to provide an indication of tampering.

2. The security laminate of claim 1 wherein said low adhesion coating comprises ethylene acrylic acid.

3. The security laminate of claim 1 wherein said low adhesion coating comprises an acrylic resin.

4. The security laminate of claim 1 wherein said low adhesion coating is invisible to the unaided eye.

5. The security laminate of claim 1 wherein said emblem layer is visible to the unaided eye.

6. The security laminate of claim 1 wherein said emblem layer is pearlescent printing, ultraviolet visible printing, holographic embossing, or a combination thereof.

7. The security laminate of claim 1 wherein the emblem layer is substantially transparent to the unaided eye.

8. The security laminate of claim 1 wherein the protective layer comprises a film selected from the group consisting of polyester, polyvinyl chloride or polyolefin film.

9. The security laminate of claim 1 wherein the adhesive layer is comprised of a pressure sensitive adhesive.

10. The security laminate of claim 9 further including a release liner bonded to the pressure sensitive adhesive layer.

11. The security lamimate of claim 1 wherein said laminate is perforated.

12. The security laminate of claim 11 wherein said perforations divide the laminate into two pieces of substantially equal size.

13. The security laminate of claim 10 wherein said release liner includes a plurality of security laminates bonded thereto in adjacent relationship.

14. The security laminate of claim 1, wherein said bond between the coating layer and the emblem layer is a primerless bond.

15. The security laminate of claim 1, wherein said laminate is adhered to at least one major surface of a document.

16. The security laminate of claim 1, wherein said adhesive layer is bonded to both the emblem layer and to the coating layer.

17. The security laminate of claim 1, wherein said adhesive layer is bonded to the emblem layer, to the coating layer, and to the protective layer.