Durable security laminate with heat-shrinkable layer

• US 6,284,337 B1
• Filed: 06/23/1999
• Issued: 09/04/2001
• Est. Priority Date: 12/09/1994
• Status: Expired due to Fees

• Current Assignee: 3M Innovative Properties Company (3M Company)
• Original Assignee: 3M Innovative Properties Company (3M Company)
• Inventors: Fossum, Douglas K., Lorimor, Lynn E., Fox, Frederick J.
• Primary Examiner(s): Dye, Rena L.
• Application Number:
  US09/338,537
• Time in Patent Office: 804 Days
• Field of Search: 428/40.1, 428/40.7, 428/41.8, 428/42.1, 428/43, 428/349, 428/201, 428/202, 428/480, 428/516, 428/915, 428/354, 402/990.1, 406/30, 283/81, 283/101, 283/72, 283/107, 283/108, 283/109, 283/110, 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 heat-shrinkable layer having a major surface;

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

(c) an 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 application of a sufficient amount of heat distorts the heat-shrinkable layer to provide an indication of tampering.

2. The security laminate of claim 1, wherein said heat-shrinkable layer comprises polyolefin.

3. The security laminate of claim 1, wherein said heat-shrinkable layer distorts at temperatures above 90°

C.

4. The security laminate of claim 1, wherein said adhesive layer comprises a pressure sensitive adhesive.

5. The security laminate of claim 1, wherein said emblem layer is a discontinuous emblem layer.

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

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

8. 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.