Ink With Cohesive Failure and Identification Document Including Same

• US 20070158939A1
• Filed: 12/05/2006
• Published: 07/12/2007
• Est. Priority Date: 10/02/2001
• Status: Active Grant

• Current Assignee: Digimarc Corporation
• Original Assignee: Digimarc Corporation
• Inventors: Jones, Robert, Bloomberg, Bentley
• Granted Patent: US 7,819,327 B2
• Time in Patent Office: Days
• US Class Current: 283/109
• CPC Class Codes: B32B 2425/00 Cards, e.g. identity cards, credit cards
• CPC Class Codes: B41M 3/14 Security printing securities B42D25/29
• CPC Class Codes: B41M 3/144 using fluorescent, luminescent or iridescent effects
• CPC Class Codes: B41M 3/146 using a non human-readable pattern which becomes visible on reproduction, e.g. a void mark
• 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 25/29 Securities; Bank notes
• CPC Class Codes: B42D 25/378 Special inks
• CPC Class Codes: B42D 25/387 absorbing or reflecting ultraviolet light
• CPC Class Codes: C09D 11/00 Inks
• CPC Class Codes: G06K 19/02 characterised by the selection of materials, e.g. to avoid wear during transport through the machine
• CPC Class Codes: G09F 3/0292 tamper indicating labels
• CPC Class Codes: Y10T 156/10 Methods of surface bonding and/or assembly therefor
• CPC Class Codes: Y10T 428/24802 Discontinuous or differential coating, impregnation or bond [e.g., artwork, printing, retouched photograph, etc.]

Abstract

The present invention provides identification documents with security features. For example, a document may include two or more inks that are designed to cohesively fail upon a de-lamination attack. A resulting failure pattern is preferably difficult to predict. The two or more inks are applied to an identification document including a core and laminate layer. At least one of the inks is characterized such that an adhesive strength of the ink to the core and an adhesive strength of the ink to the laminate layer is each greater than the cohesive strength of the ink itself. Thus, the ink rips apart in a somewhat random-like manner upon a de-lamination attack. The ink can be arranged in interwoven or interlocking patterns or in other desired patterns and locations.

Claims

1. An identification document comprising:

a core including a front surface and a back surface;

an over-laminate including a front surface and a back surface, the back surface being adjacently positioned with said core front surface; and

two or more inks provided on at least one of the front surface of the core or the back surface of the over-laminate,

the two or more inks are characterized by including substantially the same degree of adhesion to both the front surface of the core and to the back surface of the over-laminate,

the adhesion of the two or more inks to the front surface of the core and the adhesion of the two or more inks to the back surface of the over-laminate is each relatively stronger than a cohesive strength of the ink, and

the two or more inks are provided on the front surface or the back surface in a pattern, the pattern including at least a plurality of intertwined or interlocking circles or mesh structures, wherein a first ink of the two or more inks comprises a first color and a second ink of the two or more inks comprises a second, different color.

2. The document of claim 1, wherein the two or more inks cohesively delaminate upon an intrusion attempt, resulting in at least a portion of the first or second inks adhering to the front surface of the core and at least a portion of the first or second inks adhering to the back surface of the laminate.

3. The document of claim 2, wherein the intrusion attempt comprises heat.

4. The document of claim 1, wherein the two or more inks comprise a styrene-allyl alcohol copolymer.

5. The document of claim 1, wherein the first ink comprises at least one of an optically variable ink or pearlescent ink.

6. The document of claim 1, wherein the first ink comprises at least one of an ultraviolet pigment or infrared pigment.

7. The document of claim 1, wherein the two or more inks comprise ultraviolet or infrared pigments.

8. The document of claim 1, wherein the first ink is designed to unpredictably cohesively fail.

9. The document of claim 1, wherein the back surface of the laminate comprises an adhesive.

10. A method of making a tamper-resistant identification document comprising:

providing a core including a top surface;

providing a top laminate including a top surface and bottom surface; and

providing two or more inks on at least one of the top surface of the core or the bottom surface of the top laminate,

the two or more inks being characterized by having a relatively lower cohesion strength as compared to each of an adhesion strength between the two or more inks and over-laminate and to an adhesion strength between the two or more inks and the core,

the two or more inks provided on the top surface or the bottom surface of the top laminate in a pattern,

the pattern including at least a plurality of intertwined or interlocking circles or mesh structures, and

a first ink of the two or more inks comprises a first color and a second ink of the two or more inks comprises a second, different color.

11. The method of claim 10, wherein the two or more inks comprise a polymer-based resin.

12. A method of providing an identification document, the document comprising a substrate and a laminate, the method comprising:

providing the substrate and laminate;

providing an optical variable ink in a first location on the substrate or laminate,

wherein the optical variable ink includes a first component that reflects light at a first viewing angle, and a second component that reflects light at a second viewing angle;

wherein the optical variable ink is provided such that when the first component is in an active state the second component is in passive state,

the first component and the second component cooperating to convey text in an overlapping manner.

13. The method of claim 12 wherein the optical variable ink is designed to cohesively fail upon a de-lamination attack.