Oriented Image Coating on Transparent Substrate

• US 20090200791A1
• Filed: 07/06/2007
• Published: 08/13/2009
• Est. Priority Date: 07/19/2006
• Status: Active Grant

• Current Assignee: Sicpa Holding SA
• Original Assignee: Sicpa Holding SA
• Inventors: Müller, Edgar, Degott, Pierre, Despland, Claude-Alain, Schmid, Mathieu, Stichelberger, Albert
• Granted Patent: US 8,696,031 B2
• Time in Patent Office: Days
• US Class Current: 283/85
• CPC Class Codes: B05D 3/207 post-treatment by magnetic fields
• CPC Class Codes: B05D 5/061 Special surface effect
• CPC Class Codes: B32B 2425/00 Cards, e.g. identity cards, credit cards
• CPC Class Codes: B42D 15/00 Printed matter of special format or style not otherwise provided for
• CPC Class Codes: B42D 2033/16 Magnetic or magnetisable material
• CPC Class Codes: B42D 2035/24 Colours
• 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 25/26 Entrance cards; Admission tickets
• CPC Class Codes: B42D 25/29 Securities; Bank notes
• CPC Class Codes: B42D 25/324 Reliefs
• CPC Class Codes: B42D 25/355 Security threads
• CPC Class Codes: B42D 25/364 Liquid crystals
• CPC Class Codes: B42D 25/369 Magnetised or magnetisable materials
• CPC Class Codes: B44F 7/00 Designs imitating three-dimensional effects
• 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.]
• CPC Class Codes: Y10T 428/25 Web or sheet containing structurally defined element or component and including a second component containing structurally defined particles

Abstract

The present invention discloses a security element comprising a transparent substrate and a magnetically oriented image coating on said substrate, wherein said image coating is preferably laid out such as to show a 3-dimensional effect, appearing in positive or negative relief respectively, if observed form the recto- or the verso side, respectively. The security element can be easily identified by the unaided eye, by just turning around the document and observing the angle-dependent image on either side. On the other hand, the security element cannot be reproduced by scanning or copying the document.

Claims

1. Security element comprising a transparent substrate and a magnetically oriented image coating on said substrate.

2. Security element according to claim 1, wherein said image coating is laid out such as to show a 3-dimensional effect, appearing in positive or negative relief respectively, if observed form the recto- or the verso side, respectively.

3. Security element according to claim 1, wherein said transparent substrate is selected from the group consisting of poly-ethylene-terephthalate, polycarbonate, polyvinyl chloride, polyacrylates, polyacrylonitrile, polystyrene, polypropylene, poly-naphthalene-terephthalate, and mixtures or copolymers thereof.

4. Security element according to claim 1, wherein a transparent foil is laminated over said magnetically oriented image coating.

5. Security element according to claim 4, wherein said transparent foil is selected from the group consisting of poly-ethylene-terephthalate, polycarbonate, polyvinyl chloride, polyacrylates, polyacrylonitrile, polystyrene, polypropylene, poly-naphthalene-terephthalate, and mixtures or copolymers thereof.

6. Security element according to claim 1, wherein said magnetically oriented image coating comprises magnetic optically variable interference pigments.

7. Security element according to claim 6, wherein said magnetic optically variable interference pigments are selected from the group consisting of vacuum deposited magnetic thin film interference pigments, interference coated metallic pigments, interference coated non-metallic pigments, magnetic liquid crystal pigments, and mixtures thereof.

8. Security element according to claim 7, wherein said vacuum deposited magnetic thin film interference pigments are selected from the group consisting of five-layer and seven layer vacuum deposited magnetic thin film interference pigments.

9. Security element according to claim 1, further comprising marking means selected from the group consisting of infrared markers, fluorescent markers, UV markers, phosphorescence markers, magnetic markers, forensic markers and mixtures thereof.

10. Security element according to claim 1, further comprising other security elements selected from the group consisting of holograms, embossed reliefs, indicia or combinations thereof.

11. Security element according to claim 1, further comprising color-shifting elements, such as a switching optical effect or a rolling bar-type image.

12. Process for producing a security element according to claim 1, comprising the steps of

a) applying a coating composition comprising magnetically orientable pigments to a transparent substrate surface,

b) orienting the magnetic pigment particles in the applied coating composition of step a) by applying a magnetic field, and

c) curing/drying the oriented coating composition of step b) to fix the particles in the oriented position.

13. Process according to claim 12, further comprising the step of laminating a transparent foil over said magnetically induced image coating.

14. Process according to claim 12, wherein said orientation step b) is performed simultaneously with said coating step a).

15. Process according to claim 12, wherein said orientation step b) is performed subsequently to said coating step a).

16. Process according to claim 12, wherein said curing/drying step c) is carried out by a process selected from the group consisting of physical evaporation, UV-curing, oxidative reticulation, chemical crosslinking, electron beam curing, or any combination thereof.

17. Process according to claim 12, wherein said step a) is performed by means of a printing process selected from the group consisting of copperplate intaglio printing, flexographic printing, gravure printing, silkscreen printing and roller coating.

18. Method of use of a security element according to claim 1 for security documents such as banknotes, credit cards, access cards, security badges, documents of value, rights or identity, transportation tickets, lottery tickets, event tickets, tax banderoles, security threads, labels, foils, strips or product security applications, said method comprising the step of applying said security element onto said security document.

19. A document such as a banknote, a credit card, an access card, a security badge, a document of value, rights or identity, a transportation ticket, a lottery ticket, an event ticket, a tax banderole, a security thread, a label, a foil, a tear-strip or a product security application, wherein said document comprises at least one security element according to claim 1.