EP2225417B1 - Sicherheitsstruktur mit nematischen flüssigkristallen - Google Patents

Sicherheitsstruktur mit nematischen flüssigkristallen Download PDF

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Publication number
EP2225417B1
EP2225417B1 EP08863469.6A EP08863469A EP2225417B1 EP 2225417 B1 EP2225417 B1 EP 2225417B1 EP 08863469 A EP08863469 A EP 08863469A EP 2225417 B1 EP2225417 B1 EP 2225417B1
Authority
EP
European Patent Office
Prior art keywords
region
structure according
opacity
reflective
coating
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Not-in-force
Application number
EP08863469.6A
Other languages
English (en)
French (fr)
Other versions
EP2225417A2 (de
Inventor
Michel Camus
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
ArjoWiggins Security SAS
Original Assignee
ArjoWiggins Security SAS
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Filing date
Publication date
Application filed by ArjoWiggins Security SAS filed Critical ArjoWiggins Security SAS
Publication of EP2225417A2 publication Critical patent/EP2225417A2/de
Application granted granted Critical
Publication of EP2225417B1 publication Critical patent/EP2225417B1/de
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
    • D21H21/14—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties characterised by function or properties in or on the paper
    • D21H21/40—Agents facilitating proof of genuineness or preventing fraudulent alteration, e.g. for security paper

Definitions

  • the present invention relates to security structures intended to be incorporated in objects to be secured, for example valuable documents such as banknotes, tickets or coupons, packaging or security documents such as for example passports or identity cards.
  • coatings having birefringence properties for example comprising so-called nematic liquid crystals.
  • WO 02/085642 discloses the use in safety structures of a coating having birefringence properties and may include nematic liquid crystals.
  • the patent WO 96/06220 discloses a method of manufacturing paper having localized areas of low opacity.
  • the invention offers new effects through the use of said coating, preferably nematic liquid crystals, superimposed on regions of varying opacity.
  • This variation in opacity makes it possible to observe the coating differently, in particular the nematic liquid crystals, depending on whether the coating covers the first region of reduced opacity or the second region of greater opacity.
  • Specular reflection may be more or less important depending on the angle of vision.
  • the reflective quality and the specular reflection limit may be chosen so as to obtain sufficient visibility of the liquid crystals through the polarizing filter.
  • the first region of reduced opacity is semi-reflective, like a one-way mirror, while the second region of higher opacity is reflective.
  • the first and second regions both appear reflective, which contributes to the visibility of the pattern (s) formed by the coating, in particular the layer of nematic liquid crystals; these patterns may not be precisely positioned relative to the first and second regions without having a significant impact on their visibility, unlike for example a nematic liquid crystal print on a structure having reflective zones metallized and demetallised transparent areas.
  • the first and second regions can be obtained for example by a deposit of variable thickness of a metal, for example aluminum.
  • the structure comprises a deposit of a first material defining the first region of reduced opacity, being covered with a deposit of a second material in the second region of greater opacity.
  • the second region of higher opacity can completely surround the first region.
  • the first region may define patterns that repeat at regular intervals or not, these first patterns defining windows and / or text.
  • the opacity difference between the first and second regions, when the structure is observed in transvision (examination of the transmitted light), may depend on the manner in which the first and second regions are made, this opacity difference being adjusted to allow a contrast easily visible by transvision in the light of the day.
  • the opacity gap between the opacity region low and that of opacity stronger, measured spectrophotometer can be between 5 to 80 units, preferably 35-40.
  • the coating in particular the nematic liquid crystal layer, may form at least one pattern, for example a plurality of repeating patterns on the structure.
  • the coating may for example comprise an impression of nematic liquid crystals in the form of at least one pattern.
  • These patterns may for example define text or a logo or simple geometric shapes and may have a variable positioning vis-à-vis the area or areas of reduced opacity.
  • Another object of the invention is, according to another of its aspects, an object, in particular a document, incorporating a security structure as defined above.
  • the security structure may for example form a security thread extending from one edge to the other of the document.
  • the document may comprise a fibrous substrate, for example a substrate comprising paper fibers.
  • the authenticity of the structure can be concluded by observing, through the polarizing filter, the coating having birefringence properties, in particular the liquid crystals, when the regions of the coating covering the zones of low opacity contrast with those covering the zones of high opacity.
  • Authentication can be performed with the naked eye, in visible or non-visible light, in particular U.V or I.R, natural or artificial, with or without magnification.
  • the structure 10 shown on the Figures 1 to 5 comprises a transparent or translucent support 11, for example made of a thermoplastic film, for example polyester, PVC, PP, an aromatic polyamide or aramid, or others and on this support a deposit 12 of a metal, alloy or metal oxide, for example aluminum, copper, zinc, gold, platinum, ...
  • a transparent or translucent support 11 for example made of a thermoplastic film, for example polyester, PVC, PP, an aromatic polyamide or aramid, or others and on this support a deposit 12 of a metal, alloy or metal oxide, for example aluminum, copper, zinc, gold, platinum, ...
  • the deposit 12 presents in the example considered a variable thickness, thus defining a first region 14 of smaller thickness and reduced opacity and a second region 15 of greater thickness and greater opacity.
  • the thickness of the thinned layer 13 defining the first region 14 is chosen so as to give the structure, in this region 14, a semi-reflective or reflective character according to the angle of observation, that is to say whose reflectivity varies according to the angle of observation but the proportion of reflected light is less than 100%, while the thickness of the deposit 12 in the second region 15 gives the structure in this second region a character reflective opaque.
  • the thickness of the thinned layer 13 is for example between 5 and 50 nm and the thickness of the deposit 12 in the second region 15 is for example between 100 and 300 nm.
  • the first region 14 may be in various ways on the structure, for example in the form of "windows" 24 repeating at regular intervals along the structure 10, as illustrated.
  • the first region 14 can still form at least one text or logo.
  • the second region 15 completely surrounds the first region 14, but it could be different and the first region 14 could extend to at least one longitudinal edge of the structure 10.
  • the structure 10 also comprises a coating of a birefringent material, in this case a layer of nematic liquid crystals, in the form of patterns 18 which are repeated at regular intervals along the structure and whose positioning relative to the first region 14 is predefined, so that the patterns 18 cover both the first region 14 and the second region 15.
  • a birefringent material in this case a layer of nematic liquid crystals
  • nematic liquid crystals used are for example those produced by the company MERCK, adapted to conventional printing techniques, as disclosed in the application WO 2004/025337 .
  • the patterns 18 appear in front of a background that appears substantially plain, since the patterns 24 reflect the light and are not visible, or are only few, and are substantially confused with the second region 15 also reflective.
  • the zones of low opacity may have a reflectivity different from the high opacity zones, so the nematic liquid crystals may have a contrast of observation substantially different depending on the zones, through the polarizing filter.
  • the invention is not limited to a particular way of obtaining the first and second regions, and it can for example, as illustrated in FIG. figure 6 depositing on the support 11 a first reflecting material 20 whose opacity is sufficiently low to define the first region 14 and, at the sites of greater opacity, depositing a second reflecting material 21 on the first material 20.
  • the first material is for example a metal such as aluminum and the second material is for example an oxide such as TiO x or ZnS, deposited under vacuum.
  • the security structure 10 may be in the form of a security thread which for example is integrated in a document 30, which comprises for example a fibrous substrate, by a known technique of incorporation of a security thread.
  • the security structure 10 may be disposed along its entire length on the surface of the document 30, or may be partially buried in the fibrous substrate.
  • the document 30 may comprise other security elements, such as for example a watermark.
  • the security structure 10 can still be in the form of a patch, as shown in FIG. figure 8 , Such a patch being for example intended to be glued on one side of the object to be secured in a transparent or translucent region thereof.
  • the invention is not limited to the illustrated examples.
  • the reflective zones of low opacity can for example be made using an interference pigment, for example of titanium-based mica-coated plate or titanium oxide-coated glass plate, and the zones Reflective with higher opacity can be achieved using an ink, for example based on aluminum powder, the two types of patterns being printed at the mark one of the other.
  • the shape of the security structure can be modified and the first and second regions of different opacities can be made differently.
  • the security structure can be applied to objects other than paper, for example a packaging, a packaging device, a drug blister, an optical disk, etc.

Landscapes

  • Polarising Elements (AREA)
  • Credit Cards Or The Like (AREA)
  • Liquid Crystal (AREA)
  • Laminated Bodies (AREA)

Claims (16)

  1. Sicherheitsstruktur (10) mit:
    - einer ersten Region (14), die wenigstens teilweise mit verringerter Opazität reflektiert,
    - einer zweiten Region (15), die wenigstens teilweise mit einer höheren Opazität als die erste Region reflektiert,
    - einer Beschichtungsauflage (18), die Doppelbrechungseigenschaften aufweist und die erste und die zweite Region wenigstens teilweise bedeckt.
  2. Struktur nach Anspruch 1, wobei die Auflage (18) nematische Flüssigkristalle aufweist.
  3. Struktur nach Anspruch 1 oder 2, wobei die erste Region verringerter Opazität (14) halbreflektierend ist
  4. Struktur nach einem der Ansprüche 1 bis 3, wobei die zweite Region erhöhter Opazität (15) reflektierend ist.
  5. Struktur nach einem der vorstehenden Ansprüche, wobei die erste und die zweite Region durch eine Metallablagerung variabler Dicke erhalten sind.
  6. Struktur nach einem der Ansprüche 1 bis 5, wobei die erste Region durch Ablagerung eines Interferenzpigments erhalten ist.
  7. Struktur nach einem der Ansprüche 1 bis 6, wobei die erste Region eine Beschichtung aufweist, die einen großen Brechungsindexunterschied zu dem zugehörigen Trägermaterial hat.
  8. Struktur nach einem der Ansprüche 1 bis 7, wobei die erste Region einen von dem Beobachtungswinkel abhängigen Reflexionscharakter aufweist.
  9. Struktur nach einem der vorstehenden Ansprüche, wobei die zweite Region (15) die erste Region (14) vollständig umgibt.
  10. Struktur nach einem der vorstehenden Ansprüche, wobei die erste Region (14) Motive (24) definiert, die sich in regelmäßigen Abständen wiederholen.
  11. Struktur nach einem der vorstehenden Ansprüche, die in der zweiten Region (15) eine Ablagerung eines ersten Materials (20) und auf der ersten Region eine Ablagerung eines zweiten Materials (21) aufweist.
  12. Struktur nach einem der vorstehenden Ansprüche, wobei die Auflage (18) einen Aufdruck nematischer Flüssigkristalle in Form wenigstens eines Motivs aufweist.
  13. Struktur nach einem der vorstehenden Ansprüche, wobei die Doppelbrechungseigenschaften aufweisende Beschichtungsauflage (18) Motive definiert, die sich über die Struktur wiederholen.
  14. Struktur nach einem der Ansprüche 1 bis 13, wobei der Opazitätsunterschied zwischen der Region verringerter Opazität und jener erhöhter Opazität zwischen 5 und 80, vorteilhafterweise zwischen 35 und 40 (ISO-Norm 2471), liegt.
  15. Objekt, ausgewählt aus einem Dokument (30), einer Verpackung, einem Aufmachungsgegenstand, insbesondere einem Medikamentenblister oder einer Optikdisk, mit einer Sicherheitsstruktur (10) gemäß einem der vorstehenden Ansprüche.
  16. Verfahren zur Authentifizierung einer Sicherheitsstruktur gemäß einem der Ansprüche 1 bis 14, in dem:
    - die Struktur als Reflexion beobachtet wird, insbesondere unter nichtpolarisiertem Licht, wobei die Beobachtung ohne Polarisationsfilter, insbesondere ohne linearen und/oder zirkularen Polarisationsfilter, durchgeführt wird,
    - die Struktur als Reflexion durch einen Polarisationsfilter beobachtet wird.
EP08863469.6A 2007-12-24 2008-12-17 Sicherheitsstruktur mit nematischen flüssigkristallen Not-in-force EP2225417B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0760336A FR2925534B1 (fr) 2007-12-24 2007-12-24 Structure de securite comportant des cristaux liquides nematiques
PCT/FR2008/052335 WO2009081035A2 (fr) 2007-12-24 2008-12-17 Structure de securite comportant des cristaux liquides nematiques

Publications (2)

Publication Number Publication Date
EP2225417A2 EP2225417A2 (de) 2010-09-08
EP2225417B1 true EP2225417B1 (de) 2014-06-18

Family

ID=39673402

Family Applications (1)

Application Number Title Priority Date Filing Date
EP08863469.6A Not-in-force EP2225417B1 (de) 2007-12-24 2008-12-17 Sicherheitsstruktur mit nematischen flüssigkristallen

Country Status (6)

Country Link
US (1) US8397995B2 (de)
EP (1) EP2225417B1 (de)
BR (1) BRPI0821705A2 (de)
CA (1) CA2709826A1 (de)
FR (1) FR2925534B1 (de)
WO (1) WO2009081035A2 (de)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2925924B1 (fr) * 2007-12-28 2011-04-29 Arjowiggins Licensing Sas Papier de securite

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3601114A1 (de) * 1986-01-16 1987-07-23 Gao Ges Automation Org Verfahren zur herstellung von sichrheitspapier mit eingelagertem sicherheitsfaden
JP2831869B2 (ja) * 1991-12-27 1998-12-02 日本ペイント株式会社 ハロゲン化炭化水素の分解処理方法
WO1994020679A1 (fr) * 1993-03-02 1994-09-15 Arjo Wiggins S.A. Papier de securite comportant des zones localisees d'epaisseur et d'opacite reduites et son procede de fabrication
FR2723971B1 (fr) 1994-08-24 1996-10-04 Arjo Wiggins Sa Procede de fabrication d'un papier de securite comportant des zones localisees de faible opacite et papier ainsi obtenu
US6764014B2 (en) * 1999-09-07 2004-07-20 American Express Travel Related Services Company, Inc. Transaction card
EP1120737A1 (de) * 2000-01-27 2001-08-01 Rolic AG Optische Fälschungssicherheit
ATE337191T1 (de) * 2001-04-24 2006-09-15 Merck Patent Gmbh Doppelbrechende markierung
EP1335217B1 (de) * 2002-02-06 2011-03-02 Merck Patent GmbH Doppelbrechender Film und seine Verwendung
WO2004025337A1 (en) * 2002-09-11 2004-03-25 Merck Patent Gmbh Birefringent marking
DE10331798B4 (de) * 2003-07-14 2012-06-21 Giesecke & Devrient Gmbh Sicherheitselement, Wertgegenstand, Transfermaterial und Herstellungsverfahren

Also Published As

Publication number Publication date
WO2009081035A2 (fr) 2009-07-02
US8397995B2 (en) 2013-03-19
CA2709826A1 (fr) 2009-07-02
EP2225417A2 (de) 2010-09-08
FR2925534A1 (fr) 2009-06-26
FR2925534B1 (fr) 2010-02-12
WO2009081035A3 (fr) 2009-10-08
US20100276488A1 (en) 2010-11-04
BRPI0821705A2 (pt) 2015-06-16

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