Substrates

• US 20050238851A1
• Filed: 04/24/2003
• Published: 10/27/2005
• Est. Priority Date: 04/25/2002
• Status: Abandoned Application

• Current Assignee: De La Rue International Limited (De La Rue PLC)
• Original Assignee: De La Rue International Limited (De La Rue PLC)
• Inventors: Brown, Alan, Snelling, James, Isherwood, Roland
• Application Number:
  US10/511,721
• Publication Number:
  US 20050238851A1
• Time in Patent Office: Days
• US Class Current: 428/174
• 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 25/324 Reliefs
• CPC Class Codes: B42D 25/328 Diffraction gratings; Holograms
• CPC Class Codes: B42D 25/351 Translucent or partly translucent parts, e.g. windows
• CPC Class Codes: B42D 25/355 Security threads
• CPC Class Codes: B42D 25/369 Magnetised or magnetisable materials
• CPC Class Codes: B42D 25/373 Metallic materials
• CPC Class Codes: B42D 25/45 Associating two or more layers
• CPC Class Codes: B42D 25/47 using adhesives
• CPC Class Codes: D21H 21/42 Ribbons or strips filaments D21H15/06
• CPC Class Codes: D21H 21/48 Elements suited for physical verification, e.g. by irradiation
• CPC Class Codes: G06K 19/06196 Constructional details
• CPC Class Codes: Y10T 428/24628 Nonplanar uniform thickness material
• CPC Class Codes: Y10T 428/24802 Discontinuous or differential coating, impregnation or bond [e.g., artwork, printing, retouched photograph, etc.]
• CPC Class Codes: Y10T 428/24868 Translucent outer layer
• CPC Class Codes: Y10T 428/24876 Intermediate layer contains particulate material [e.g., pigment, etc.]

Abstract

The invention relates to improvements in substrates and in particular to new substrates having magnetic and visual security features, which provide security against imitation. A security substrate comprising a transparent polymer carrier layer bearing indicia formed from a plurality of opaque and non-opaque regions and a clear and transparent magnetic layer supported by the carrier layer containing a distribution of particles of a soft magnetic material of a size and distributed in a concentration at which the magnetic layer remains clear and transparent.

Claims

1. A security substrate comprising a transparent polymer carrier layer bearing indicia formed from a plurality of opaque and non opaque regions and a clear transparent magnetic layer supported by the carrier layer containing a distribution of particles of a flake nickel magnetic material, having a low coercivity of less than 100 oersteds and a highly detectable remanence, of a size and distributed in a concentration at which the magnetic layer remains clear and transparent.

2. A security substrate as claimed in claim 1 in which the transparent magnetic layer comprises a varnish in which are suspended the magnetic particles.

3. A security substrate as claimed in claim 1 in which the transparent magnetic layer lies between the carrier layer and the indicia.

4. A security substrate as claimed in claim 1 in which the indicia are formed on the carrier layer and the transparent magnetic layer covers the indicia.

6. A security substrate as claimed in claim 1 or claim 5 further comprising an additional layer of a transparent polymer laminated to the magnetic layer and/or indicia.

7. A security substrate as claimed in claim 1 or claim 5 further comprising a layer of adhesive applied to at least one side of the substrate.

8. A security substrate as claimed in claim 1 or claim 5 in which a layer of adhesive overlies the indicia.

9. A security substrate as claimed in claim 1 or claim 5 further comprising a layer of high refractive index material.

10. A security substrate as claimed in claim 1 or claim 5 in which the indicia are provided by partially demetallising a metal layer, with remaining metal forming the opaque regions and the demetallised regions forming the non opaque regions.

11. A security substrate as claimed in claim 1 or claim 5 in which the indicia are printed.

12. A security substrate as claimed in claim 1 or claim 5 further including additional printed regions formed from one or more inks having iridescent, luminescent, optically variable, liquid crystal, thermochromic and/or photochromic properties.

13. A security substrate as claimed in claim 1 or claim 5 comprising indicia provided by demetallised and metallised regions and printed indicia.

14. A security substrate as claimed in claim 13 in which the printed indicia overlie at least some of the metallic regions.

15. A security substrate as claimed in claim 13 in which the printed indicia lie within the demetallised regions.

16. A security substrate as claimed in claim 1 or claim 5 further comprising an optically variable device.

17. A security substrate as claimed in claim 16 in which the optically variable device is formed by embossing a layer of embossing lacquer.

18. A security substrate as claimed in claim 16 in which the embossing lacquer lies between the magnetic layer and the indicia.

19. A security substrate as claimed in claim 17 in which the embossing layer lies between the transparent magnetic layer and a layer of high refractive index.

20. A security substrate as claimed in claim 17 wherein the embossing layer overlies the indicia.

21. An elongate security element made by the step of slitting the substrate as claimed in claim 1 or claim 5 in register with the indicia.

22. A security document comprising a paper or polymer substrate incorporating a security thread as claimed in claim 21.

5. A security substrate comprising a clear transparent polymer carrier layer, bearing indicia formed from a plurality of opaque and non opaque regions, which carrier layer contains a distribution of particles of a soft magnetic material of a size and distributed in a concentration at which the carrier layer remains clear and transparent.