Security cards

• US 5,208,110 A
• Filed: 06/19/1989
• Issued: 05/04/1993
• Est. Priority Date: 06/21/1988
• Status: Expired due to Fees

• Current Assignee: Huntsman Advanced Materials Americas, Inc.
• Original Assignee: Ciba-Geigy Corporation (Novartis Ag)
• Inventors: Irving, Edward, Smith, Terence J.
• Primary Examiner(s): Sluby, P. C.
• Application Number:
  US07/368,452
• Time in Patent Office: 1,415 Days
• Field of Search: 428/414, 428/476.6, 428/478.4, 428/478.8, 428/480, 428/915, 428/916, 428/516, 428/205, 428/514, 428/913, 156/330
• US Class Current: 428/414
• CPC Class Codes: B32B 2310/0831 using UV radiation
• CPC Class Codes: B32B 2425/00 Cards, e.g. identity cards, credit cards
• CPC Class Codes: B32B 37/12 characterised by using adhesives
• CPC Class Codes: B42D 2033/04 Transparent material
• CPC Class Codes: B42D 2033/28 Paper or card board
• CPC Class Codes: B42D 2033/30 Plastic material
• CPC Class Codes: B42D 2033/32 Other material
• 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 25/47 using adhesives
• CPC Class Codes: G03C 11/08 Varnishing, e.g. application of protective layers on finished photographic prints
• CPC Class Codes: Y10S 428/913 Material designed to be responsive to temperature, light, moisture
• CPC Class Codes: Y10S 428/915 Fraud or tamper detecting
• CPC Class Codes: Y10S 428/916 Fraud or tamper detecting
• CPC Class Codes: Y10T 428/24884 Translucent layer comprises natural oil, wax, resin, gum, glue, gelatin
• CPC Class Codes: Y10T 428/31507 Of polycarbonate
• CPC Class Codes: Y10T 428/31515 As intermediate layer
• CPC Class Codes: Y10T 428/31565 Next to polyester [polyethylene terephthalate, etc.]
• CPC Class Codes: Y10T 428/31576 Ester monomer type [polyvinylacetate, etc.]
• CPC Class Codes: Y10T 428/31754 Natural source-type polyamide
• CPC Class Codes: Y10T 428/31772 Next to cellulosic
• CPC Class Codes: Y10T 428/31775 : Paper
• CPC Class Codes: Y10T 428/31786 : Of polyester [e.g., alkyd, etc.]
• CPC Class Codes: Y10T 428/31913 : Monoolefin polymer

Abstract

A security card comprises a data-carrying sheet having a gelatin layer thereon and a transparent polymeric film having a gelatin layer thereon, said sheet and said film being bonded together by an adhesive composition polymerized between and in contact with the gelatin layers, the adhesive composition comprising a carboxylic acid having at least one polymerizable acrylic group.

Claims

1. A security card comprising a data-carrying sheet having a gelatin layer thereon and a transparent polymeric film having a gelatin layer thereon, said sheet and said film being bonded together by an adhesive composition polymerized between and in contact with the gelatin layers, the adhesive composition comprising a carboxylic acid having at least one polymerizable acrylic group.

2. A card according to claim 1, in which the carboxylic acid is a monoacrylic compound having from 3 to 30 carbon atoms.

3. A card according to claim 2, in which the carboxylic acid is of formula

4. A card according to claim 3, in which R¹ denotes a hydrogen atom and R² denotes a hydrogen atom or a group of formula --CH₂ CH₂ COOH, or R¹ denotes a methyl group and R² denotes a hydrogen atom or a group of formula --CH₂ CH(CH₃)COOH.

5. A card according to claim 1, in which the adhesive composition also contains a further acrylic material which is a polyfunctional material having, on average, more than one polymerizable acrylic group per molecule.

6. A card according to claim 3, in which the adhesive composition also contains a further acrylic material which is a polyfunctional material having, on average, more than one polymerizable acrylic group per molecule.

7. A card according to claim 5, in which the polyfunctional material is an ester of an epoxide resin with a carboxylic acid having a polymerizable acrylic group.

8. A card according to claim 6, in which the polyfunctional material is an ester of an epoxide resin with a carboxylic acid having a polymerizable acrylic group.

9. A card according to claim 7, in which the polyfunctional material is an ester of an epoxide resin with acrylic or methacrylic acid.

10. A card according to claim 8, in which the polyfunctional material is an ester of an epoxide resin with acrylic or methacrylic acid.

11. A card according to claim 7, in which the adhesive composition also contains an ester of the epoxide resin with a saturated monocarboxylic acid having from 6 to 20 carbon atoms.

12. A card according to claim 8, in which the adhesive composition also contains an ester of the epoxide resin with a saturated monocarboxylic acid having from 6 to 20 carbon atoms.

13. A card according to claim 1, in which the adhesive composition contains a mixture of the carboxylic acid and a polyfunctional material having, on average, more than one polymerizable acrylic group per molecule, the weight ratio of carboxylic acid to polyfunctional material being from 1:

1.5 to 10;

1.

14. A card according to claim 1, in which the adhesive composition also contains a photopolymerization initiator for the acrylic group and is polymerized by subjection to photopolymerizing radiation.

15. A card according to claim 14, in which the adhesive composition also contains a free radical polymerization initiator and is polymerized by subjection to photopolymerizing radiation followed by free radical polymerization.

16. A card according to claim 1, in which the adhesive composition also contains a free radical polymerization initiator and is polymerized by free radical polymerization.

17. A card according to claim 1, in which the transparent polymeric film is of a polyester or a cellulose triacetate.

18. A card according to claim 1, in which the data-carrying sheet is a sheet of paper.

19. A card according to claim 1, in which the data-carrying sheet has a gelatin layer on each face and a transparent polymeric film as specified in claim 1 is bonded to each face.

20. A card according to claim 1, obtained by pressing the transparent polymeric film and the data-carrying sheet together, with the adhesive composition sandwiched between them, in a laminating apparatus.