Security element displaying a visual motion effect and method for producing same

Patent metadata

Field	Value
Publication number	US-9199502-B2
Application number	US-201213365846-A
Country	US
Kind code	B2
Filing date	Feb 3, 2012
Priority date	Feb 4, 2011
Publication date	Dec 1, 2015
Grant date	Dec 1, 2015

Abstract

Device for the counterfeit protection of a banknote, a document of value or an article. The device includes a substrate (S), and on the substrate (S) a plurality of jointly visible zones of first ( 1 ) and of second ( 2 ) hardened coatings including oriented pigment particles (P 1 , P 2 ) in a transparent binder (M 1 , M 2 ), the first ( 1 ) hardened coating having a pigment orientation imitating a first curved surface and the second ( 2 ) hardened coating having a pigment orientation imitating a second curved surface different from the first curved surface. The device is characterized in that, along a linear section through the device, at least one zone of the second ( 2 ) hardened coating is contiguously located between two zones of the first ( 1 ) hardened coating. Method for producing the device, the use of the device, as well as security documents carrying said device.

First claim

What is claimed:

1. A device comprising:
a substrate, and
a plurality of jointly visible zones of first and of second hardened coatings on the substrate, the first and second hardened coatings comprising oriented pigment particles in a transparent binder, such that said first hardened coating has a pigment orientation imitating a first curved surface with a first nature of curvature that is saddle-shaped and said second hardened coating has a pigment orientation imitating a second curved surface with a second nature of curvature that is saddle-shaped and different from said first nature of curvature,
wherein, along a linear section through the device viewed perpendicularly to the substrate, at least one zone of said second hardened coating is contiguously located between two zones of said first hardened coating.

2. The device according to claim 1 , wherein, along the linear section through the device viewed perpendicularly to the substrate, additionally at least one of said two zones of said first hardened coating is contiguously located within two zones of said second hardened coating.

3. The device according to claim 1 , wherein said first and said second coatings are disposed either aside each other and/or on top of each other.

4. The device according to claim 1 , wherein said substrate is selected from the group consisting of paper substrates, the opaque or opacified polymer substrates, transparent polymer substrates and metallic substrates.

5. The device according to claim 1 , wherein said first and said second hardened coatings are disposed on a recto and on a verso side, respectively, of a transparent substrate.

6. The device according to claim 1 , comprising a combination of said first and said second coatings with at least one further coating comprising oriented pigment particles.

7. The device according to claim 1 , wherein said first and/or said second hardened coating is present in the form of indicia selected from the group consisting of simple geometric figures or patterns, letters, texts, logos and images.

8. The device according to claim 1 , wherein said oriented pigment particle in said first and/or said second hardened coating is a magnetic pigment particle, comprising a permanent-magnetic or a magnetizable material of ferromagnetic or ferrimagnetic type.

9. The device according to claim 1 , wherein said oriented pigment particle in said first and/or said second hardened coating the flake-shaped vacuum-deposited magnetic thin-film interference pigment particles.

10. The device according to claim 1 , wherein said oriented pigment particle in said first and/or said second hardened coating is an optically variable magnetic pigment particle.

11. The device according to claim 1 , wherein said first and/or said second hardened coating comprises at least one color-shifting pigment selected from the group consisting of vacuum-deposited optically variable thin-film interference pigments having an all-dielectric or a metal-dielectric interference design, coated metal-core particles, coated dielectric particles, cholesteric liquid crystal polymer pigments, embossed holographic pigments, and mixtures thereof.

12. The device according to claim 11 , wherein said first and/or said second hardened coating comprises a dye and/or at least one non-color-shifting pigment.

13. The device according to claim 1 , wherein the device comprises a combination of areas coated with a composition comprising optically variable pigment and areas coated with a composition not comprising optically variable pigment.

14. A method of forming the device according to claim 1 , the method comprising:
arranging the plurality of jointly visible zones so that the at least one zone of the second hardened coating is contiguously located between the two zones of the first hardened coating; and
hardening, on the substrate, the plurality of jointly visible zones comprising the first hardened coating comprising the pigment particles oriented in the transparent binder according to the saddle-shaped first nature of curvature and the second hardened coating comprising the pigment particles oriented in the transparent binder according to the saddle-shaped second nature of curvature that is different from the saddle-shaped first nature of curvature.

15. A method for producing the device of claim 1 , comprising:
applying a plurality of areas of first and of second coating compositions to a substrate, the first and second coating compositions comprising pigment particles in a transparent binder;
orienting the pigment particles in said applied first coating composition so as to imitate the first curved surface with the first nature of curvature that is saddle-shaped;
orienting the pigment particles in said applied second coating composition so as to imitate the second curved surface with the second nature of curvature that is saddle-shaped different from said first imitated curved surface; and
hardening said first and said second coating compositions to obtain first and second hardened coatings having the oriented particles fixed in their respective positions and orientations,
wherein said areas of first and of second coating compositions are applied such that, along a linear section through the device viewed perpendicularly to the substrate, at least one zone of said second hardened coating is contiguously located between two zones of said first hardened coating.

16. The method according to claim 15 , wherein said areas of first and of second coating compositions are applied such that additionally at least one of said two zones of said first hardened coating, when viewed along the linear section and perpendicularly to the substrate, is contiguously located within two zones of said second hardened coating.

17. The method according to claim 15 , wherein said substrate is selected from the group consisting of paper substrates, opaque or opacified polymer substrates, transparent polymer substrates and metallic substrates.

18. The method according to claim 15 , wherein said first and said second coatings are applied by a printing process chosen from silkscreen printing, flexographic printing and gravure printing, using a corresponding coating composition.

19. The method according to claim 18 , wherein the coating composition is formulated for and hardened by radiation curing, selected from UV-curing and electron-beam curing.

20. The method according to claim 15 , wherein said first and said second coating compositions are applied to recto and to verso side, respectively, of a transparent substrate.

21. The method according to claim 15 , wherein said pigment particles in said first and said second coating compositions are magnetic pigment particles comprising a permanent-magnetic or a magnetizable material of ferromagnetic or ferrimagnetic type, and wherein said orienting of the pigment particles in said applied first and second coating compositions is performed by applying magnetic fields.

22. The method according to claim 15 , wherein said pigment particles in said first and/or said second coating compositions comprise the flake-shaped vacuum-deposited magnetic thin-film interference pigment particles.

23. The method according to claim 15 , wherein said pigment particles in said first and/or said second coating compositions are optically variable magnetic pigment particles.

24. The method according to claim 15 , wherein the first hardened coating is produced subsequent to the sec

Assignees

• Degott Pierre
• Despland Claude-Alain
• Schmid Mathieu
• Amerasinghe Cedric
• Sicpa Holding Sa

Inventors

• Degott Pierre
• Despland Claude-Alain
• Schmid Mathieu
• Amerasinghe Cedric

Classifications

• B42D25/23

  Identity cards · CPC title

• B42D25/25

  Public transport tickets (apparatus for printing and issuing G07B) · CPC title

• B42D25/369 Primary

  Magnetised or magnetisable materials · CPC title

• B05D3/20

  by magnetic fields · CPC title

• B42D25/29

  Securities; Bank notes · CPC title