Laminate structure

• US 6,316,082 B1
• Filed: 05/05/2000
• Issued: 11/13/2001
• Est. Priority Date: 05/07/1997
• Status: Expired due to Term

• Current Assignee: API Group Incorporated (APi Group Corp.)
• Original Assignee: API Group Incorporated (APi Group Corp.)
• Inventors: Tomkins, Donald William, Bleasdale, Thomas Anthony, Fergusson, Lynn Shona Hardie
• Primary Examiner(s): LAM, CATHY FONG FONG
• Application Number:
  US09/423,271
• Time in Patent Office: 557 Days
• Field of Search: 428/913.3, 428/914, 428/915, 428/202, 283/72, 283/83, 283/100
• US Class Current: 428/202
• CPC Class Codes: B42D 25/328 Diffraction gratings; Holograms
• CPC Class Codes: B42D 25/355 Security threads
• CPC Class Codes: Y10S 428/914 Transfer or decalcomania
• CPC Class Codes: Y10S 428/915 Fraud or tamper detecting
• CPC Class Codes: Y10T 428/2486 with outer strippable or release layer

Abstract

The present invention relates to the field of laminated materials and, in particular, to laminates (1) for stamping foils and security threads (1). In one aspect there is provided a laminate (1) for a stamping foil comprising a carrier layer, a translucent or transparent coloured first lacquer layer (5), a translucent or transparent second lacquer layer (10) disposed between the carrier layer and the first lacquer layer and a light-reflecting layer (20) adjacent to the first lacquer layer, wherein the first lacquer layer is incomplete in a region substantially in register with an incomplete region in the light-reflecting layer such that the carrier layer is partially covered by the first lacquer layer and the light-reflecting layer (20).

Claims

1. A security thread laminate comprising a translucent or transparent support layer, a translucent or transparent coloured first lacquer layer, a translucent or transparent second lacquer layer disposed between the support layer and the first lacquer layer and a light-reflecting layer adjacent to the first lacquer layer, wherein the first lacquer layer is incomplete in a region substantially in register with an incomplete region in the light-reflecting layer such that the support layer and the second lacquer layer are partially covered by the first lacquer layer and the light-reflecting layer.

2. A laminate as claimed in claim 1, further comprising a third lacquer layer interposed between the first and second lacquer layers to resist dye migration.

3. A laminate as claimed in claim 2, wherein the third lacquer layer comprises styrene maleic anhydride or a modified cellulose acetate.

4. A laminate as claimed in claim 1, wherein the first lacquer layer comprises one or more microdispersed pigments.

5. A laminate as claimed in claim 1, wherein the substantially in register incomplete regions in the first lacquer layer and the light-reflecting layer result in a visual element which comprises a pattern, design, marking or a combination of two or more thereof.

6. A laminate as claimed in claim 1, wherein a pattern, design, marking or a combination of two or more thereof is provided on a surface of the first lacquer layer.

7. A laminate as claimed in claim 1, wherein a three-dimensional pattern, design, marking or a combination of two or more thereof is provided on a surface of the first lacquer layer, which surface faces the light-reflecting layer.

8. A laminate as claimed in claim 7, wherein the three-dimensional pattern, design or marking or combination of two or more thereof is contained in a hologram or a diffraction grating or a combination thereof.

9. A laminate as claimed in claim 1, further comprising a protective layer on a surface of the light-reflecting layer, which surface faces away from the first lacquer layer.

10. A laminate as claimed in claim 9, wherein the protective layer is incomplete in a region in register with the incomplete region in the light-reflecting layer.

11. A laminate as claimed in claim 9, wherein the protective layer comprises a resist material.

12. A laminate as claimed in claim 9, further comprising an adhesive layer disposed on a surface of the protective layer, which surface faces away from the light-reflecting layer.

13. A laminate as claimed in claim 1, further comprising an adhesive layer disposed on a surface of the light-reflecting layer, which surface faces away from the first lacquer layer.

14. A laminate as claimed in claim 1, wherein the light-reflecting layer is formed from a metal or alloy.

15. A laminate as claimed in claim 14, wherein the light-reflecting layer is formed from Al, Cu, Ni, Cr, Fe, Ag or Au or an alloy of two or more thereof.

16. A laminate as claimed in claim 1, wherein the light-reflecting layer is formed from a transparent or translucent material having a high refractive index.

17. A laminate as claimed in claim 1, wherein the support layer comprises polyester, polypropylene, polyethylene or a mixture of two or more thereof.

18. A laminate as claimed in claim 1, wherein the first lacquer layer is formed form a material which is substantially soluble in water, an alkaline solution, an acidic solution or an organic solvent.

19. A laminate as claimed in claim 18, wherein the second lacquer layer is substantially insoluble in the solution in which the first lacquer layer is soluble.

20. A laminate as claimed in claim 1, wherein the first lacquer layer comprises styrene maleic anhydride and a colouring agent.

21. A laminate as claimed in claim 1, wherein the second lacquer layer comprises an acrylic, a vinyl polymer, a polystyrene or a polyamide or copolymers thereof and optionally a colouring agent.

22. A security thread laminate as in claim 1, wherein the second lacquer layer is partially covered by the first lacquer layer and the light-reflecting layer.

23. A security document, a record, a ticket, a cheque, a financial card, a banknote, an identity card, a passport or a driver'"'"'s license comprising a laminate as claimed in claim 1.

24. A laminate for a stamping foil comprising a carrier layer, a translucent or transparent coloured first lacquer layer, a translucent or transparent second lacquer layer disposed between the carrier layer and the first lacquer layer and a light-reflecting layer adjacent to the first lacquer layer, wherein the first lacquer layer is incomplete in a region substantially in register with an incomplete region in the light-reflecting layer such that the second lacquer layer is partially covered by the first lacquer layer and the light-reflecting layer.

25. A laminate as claimed in claim 24, further comprising a release layer disposed between the carrier layer and the second lacquer layer.

26. A laminate as claimed in claim 24, wherein the carrier layer comprises polyester, polypropylene, polyethylene or a mixture of two or more thereof.

27. An article having stamped thereon a laminate as claimed in claim 24.

28. An article as claimed in claim 27, which is a container, a carton, a card, a bottle, a label or a packaging material.

29. An article as claimed in claim 27, which is a security document, a record, a ticket, a cheque, a financial card, a banknote, an identity card, a passport or a driver'"'"'s license.

30. A method of providing an information, decorative or security element on the surface of an article comprising the steps of:

(a) positioning a laminate as claimed in claim 24 adjacent to the surface of the article such that the carrier layer faces away from the surface;

(b) applying pressure and/or heat to the foil such that the foil adheres to the surface of the article; and

(c) removing the carrier layer.

31. A laminate as claimed in claim 24, wherein the first lacquer layer is formed from a material which is substantially soluble in water, an alkaline solution, an acidic solution or an organic solvent.

32. A laminate as claimed in claim 31, wherein the second lacquer layer is substantially insoluble in the solution in which the first lacquer layer is soluble.

33. A laminate as claimed in claim 24, wherein the first lacquer layer comprises styrene maleic anhydride and a colouring agent.

34. A laminate as claimed in claim 24, wherein the second lacquer layer comprises an acrylic, a vinyl polymer, a polystyrene or a polyamide or copolymers thereof and optionally a colouring agent.

35. A process for making a laminate for a security thread having a translucent or transparent support layer, a translucent or transparent coloured first lacquer layer, a translucent or transparent second lacquer layer and a light-reflecting layer, the first lacquer layer being incomplete in a region substantially in register with an incomplete region in the light-reflecting layer, which process comprises the steps of:

(i) applying the second lacquer layer on to the support layer;

(ii) applying the first lacquer layer on to the second lacquer layer;

(iii) applying the light reflective layer on to the first lacquer layer;

(iv) applying a resist mask on to the light reflective layer to define one or more regions which are not to be removed; and

(v) contacting the laminate and resist mask from step (iv) with at least one chemical so as to substantially remove the light-reflecting layer and the first lacquer layer in regions not covered by the resist mask without removing the second lacquer layer in the regions not covered by the resist mask.

36. A process as claimed in claim 35, wherein the said at least one chemical comprises an alkaline solution.

37. A process as claimed in claim 35, wherein, prior to step (ii), a third lacquer layer is applied onto the second lacquer layer from step (i) in order to resist dye migration between the said first and second lacquer layers.

38. A process according to claim 35, wherein the light-reflecting layer and the first lacquer layer are removed such that incomplete regions of the light-reflecting layer and the first lacquer layer are substantially in register with each other, and the second lacquer layer is partially covered by the first lacquer layer and the light-reflecting layer.

39. A process for making a laminate for a stamping foil having a carrier layer, a translucent or transparent coloured first lacquer layer, a translucent or transparent second lacquer layer and a light-reflecting layer, the first lacquer layer being incomplete in a region substantially in register with an incomplete region in the light-reflecting layer, which process comprises the steps of:

(i) applying the second lacquer layer on to the carrier layer;

(ii) applying the first lacquer layer on to the second lacquer layer;

(iii) applying the light reflective layer on to the first lacquer layer;

(iv) applying a resist mask on to the light reflective layer to define one or more regions which are not to be removed; and

(v) contacting the laminate and resist mask from step (iv) with at least one chemical so as to substantially remove the light-reflecting layer and the first lacquer layer in regions not covered by the resist mask without removing the second lacquer layer in the regions not covered by the resist mask.

40. A process according to claim 39, wherein the light-reflecting layer and the first lacquer layer are removed such that incomplete regions of the light-reflecting layer and the first lacquer layer are substantially in register with each other, and the second lacquer layer is partially covered by the first lacquer layer and the light-reflecting layer.