EP2932480A1 - Method for checking the authenticity of a security document - Google Patents

Method for checking the authenticity of a security document

Info

Publication number
EP2932480A1
EP2932480A1 EP13802970.7A EP13802970A EP2932480A1 EP 2932480 A1 EP2932480 A1 EP 2932480A1 EP 13802970 A EP13802970 A EP 13802970A EP 2932480 A1 EP2932480 A1 EP 2932480A1
Authority
EP
European Patent Office
Prior art keywords
zone
compound
security document
temperature
authenticity
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.)
Granted
Application number
EP13802970.7A
Other languages
German (de)
French (fr)
Other versions
EP2932480B1 (en
Inventor
Ella Dermilly
Hubert Le Bozec
Régis Reau
Julien Gillot
Xavier Borde
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.)
Oberthur Fiduciaire SAS
Original Assignee
Oberthur Fiduciaire SAS
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Oberthur Fiduciaire SAS filed Critical Oberthur Fiduciaire SAS
Priority to PL13802970T priority Critical patent/PL2932480T3/en
Publication of EP2932480A1 publication Critical patent/EP2932480A1/en
Application granted granted Critical
Publication of EP2932480B1 publication Critical patent/EP2932480B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

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
    • G—PHYSICS
    • G07—CHECKING-DEVICES
    • G07D—HANDLING OF COINS OR VALUABLE PAPERS, e.g. TESTING, SORTING BY DENOMINATIONS, COUNTING, DISPENSING, CHANGING OR DEPOSITING
    • G07D7/00—Testing specially adapted to determine the identity or genuineness of valuable papers or for segregating those which are unacceptable, e.g. banknotes that are alien to a currency
    • G07D7/003—Testing specially adapted to determine the identity or genuineness of valuable papers or for segregating those which are unacceptable, e.g. banknotes that are alien to a currency using security elements

Definitions

  • the present invention relates to a method for verifying the authenticity of a security document.
  • the present invention finds application, particularly in the field of fiduciary industry and more particularly in the manufacture of security documents.
  • security document means a document, for example paper, which includes within it and / or is coated with means making it possible to secure the manufacture thereof, so as to make it impossible to reproduce it fraudulently, at least particularly complex, and to ensure authentication.
  • Luminescent type security elements are known to those skilled in the art. Fluorescent, phosphorescent inks with one or more excitation wavelengths are widely used in the field of security printing. The control equipment of such inks are also widely known and used by the general public.
  • Multi-stimuli responding to two or more stimuli are rarer and none meets both reversible and distinct physicochemical properties, namely mechanofluorochromism and thermofluorochromism that can be exercised either independently or in a complementary manner.
  • mechanofluorochromism and thermofluorochromism that can be exercised either independently or in a complementary manner.
  • these two properties can be interesting especially to make even more difficult the fraudulent manufacture of security document.
  • the surface of the support (compound + support in the liquid phase) at a temperature equivalent to or greater than the melting point of the compound.
  • the compound passes into the liquid phase and can react with the support, ie the material, for example the banknote on which it is affixed.
  • the solid state at room temperature, the compound can change its structural organization and thus lose its properties within the support.
  • WO-A-2011/068537 discloses a family of compounds which comprises, in particular, the compound of the following formula:
  • a composition that contains it has a reversible mechanochromic effect.
  • the present applicant has emphasized the fact that a composition containing it meets both of two reversible and distinct physicochemical properties mentioned above, namely the mechanofluorochromism and the thermofluorochromism which can be exerted either independently or in a complementary way.
  • the present invention relates to a method for verifying the authenticity of a security document, in particular a fiduciary document, which comprises at least one zone with, within or on the surface of this zone, a reversible mechano-luminescent compound of formula :
  • R represents an alkyl chain comprising 1 to 12 carbon atoms, which method comprises a step in which said zone is subjected to ultraviolet radiation so that all of said zone is visible to the naked eye in a first fluorescent color
  • the temperature at which the compound is subjected is lower than its melting temperature
  • said temperature is between 50 and 250 ° C .
  • said heating of said zone to said temperature is carried out for a period of between 1 and 10 seconds;
  • said reversible compound mentioned above is on the surface, and it is used while it is integrated in an ink or varnish; - It is implemented with a security document in which said compound is covered with a varnish, varnish which otherwise covers all or part of the prints on this security document;
  • FIGS. 1 to 3 are partial top views of a bank note shown in several different states corresponding to the method of the invention
  • FIG. 4 is a diagram showing the various phenomena implemented in accordance with the invention.
  • FIGS 1 to 3 are diagrammatically shown, front view, a security document which consists of a bank note 1. It could however be another type of security document such as a visa or a passport. It is therefore a simple example of realization.
  • the present invention relates to a method for verifying the authenticity of a security document, in particular a fiduciary document, which comprises at least one zone with, within or on the surface of this zone, a luminescent compound. reversible formula:
  • R represents an alkyl chain comprising 1 to 12 carbon atoms.
  • An ink or varnish-type composition can be made by using a colorless or virtually colorless "intaglio" matrix called in terms of the "transparent white” art, in particular available from SICPA.
  • This matrix consists mainly of drying vegetable oils, solvents, resins and additives (fillers, driers).
  • a compound of formula I above is introduced into such a matrix at a level of between 1 and 10% by weight. Preferably, this rate is 5%.
  • This ink or this varnish is then affixed to the fiduciary paper constituting the banknote 1 according to one of the methods known to those skilled in the art.
  • the compound I may have different colors of fluorescence under UV irradiation (symbolized R in the figures) .
  • the compound I having 12 carbon atoms has a blue color fluorescence in a soft ink, while the compound I with 6 carbon atoms has a green fluorescence in this same matrix .
  • This color, referenced C1 in Figure 1 is homogeneous throughout the varnish or ink.
  • Stopping the heating and then resuming it at a temperature of the order of 30 to 50 ° C allows to return to the state A.
  • state C although fluorescent, no longer has the property of mechanofluorochromism. In other words, even if the area is subject to friction, it does not change color locally.
  • the zone 4 having the state B shown in FIG. 4 can be heated (to at least 50 ° C.) in order to go to the state C.
  • the return to the initial state A is done by the aforementioned method of heating at low temperature (30 ° -50 ° C).
  • the heating time at said temperature above 50 ° C is generally between 1 and 10 seconds.
  • the melting temperature of the pure product in which is 1 58 ° C.
  • This temperature is variable depending on the length of the group R.
  • the present method provides a significant change in fluorescence color, either by friction or by heat input, as well as a loss of the mechanofluorochromic property by heating.
  • a varnish to the security document, which covers all or part of the printouts and / or other security features on the document.
  • a continuous film of polymeric material is applied, intended to completely or partially cover the impressions appearing on the security document.
  • this coating has a protective function.
  • the man in the street or the trader can see the fluorescence of the area using a UV lamp and check by friction, the color change.
  • a device combining a UV lamp and a heating means may be made available to the banks for implementing the present method.
  • Such a device can also be integrated within an automatic ticket sorting machine.

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Security & Cryptography (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Credit Cards Or The Like (AREA)
  • Inspection Of Paper Currency And Valuable Securities (AREA)
  • Printing Methods (AREA)
  • Inks, Pencil-Leads, Or Crayons (AREA)

Abstract

The present invention concerns a method for checking the authenticity of a security document, in particularly a fiduciary document, which comprises an area with, within or at the surface of this area, a reversible mecanoluminescent compound of formula (i): In which R represents an alkyl chain comprising 1 to 12 carbon atoms, which comprises a step in which said area is subjected to ultraviolet radiation such that the whole of said area is visible to the naked eye in a first fluorescent colour (C1), characterised by the fact that it also comprises a step that consists of heating at least said area to a temperature of at least 50° C, without subjecting it to any friction or mechanical stress whatsoever, the revealing of the authenticity of said document being confirmed by the shift from said first colour (C1) to a second fluorescent colour (C2) different from the first.

Description

PROCEDE POUR VERIFIER L'AUTHENTICITE D'UN DOCUMENT DE SECURITE  METHOD FOR VERIFYING THE AUTHENTICITY OF A SECURITY DOCUMENT
La présente invention est relative à un procédé pour vérifier l'authenticité d'un document de sécurité. The present invention relates to a method for verifying the authenticity of a security document.
La présente invention trouve une application, notamment dans le domaine de l'industrie fiduciaire et plus particulièrement dans la fabrication de documents de sécurité.  The present invention finds application, particularly in the field of fiduciary industry and more particularly in the manufacture of security documents.
On entend par l'expression « document de sécurité », un document, par exemple en papier, qui inclut en son sein et/ou est revêtu de moyens permettant d'en sécuriser la fabrication, de manière à en rendre la reproduction frauduleuse impossible, à tout le moins particulièrement complexe, et d'en assurer l'authentification.  The term "security document" means a document, for example paper, which includes within it and / or is coated with means making it possible to secure the manufacture thereof, so as to make it impossible to reproduce it fraudulently, at least particularly complex, and to ensure authentication.
Dans le domaine technique des documents de sécurité, la protection contre la contrefaçon est réalisée grâce notamment à un ensemble d'éléments intégrés ou appliqués au support.  In the technical field of security documents, protection against counterfeiting is achieved thanks to a set of integrated elements or applied to the support.
Ces éléments de sécurité sont classés selon plusieurs niveaux de sécurités. On répartit ainsi usuellement les sécurités selon trois niveaux.  These security elements are classified according to several levels of security. It is thus usually distributed security in three levels.
Les éléments de sécurité de type luminescents sont connus de l'homme de l'art. Les encres fluorescentes, phosphorescentes à une ou multiple longueur d'onde d'excitation sont largement utilisées dans le domaine de l'impression de sécurité. Les équipements de contrôle de telles encres sont également largement connus et utilisés par le grand public.  Luminescent type security elements are known to those skilled in the art. Fluorescent, phosphorescent inks with one or more excitation wavelengths are widely used in the field of security printing. The control equipment of such inks are also widely known and used by the general public.
L'utilisation et la diffusion massive de ces encres notamment dans des secteurs autres que l'impression fiduciaire (pharmacie, peintures décoratives, jouets, etc.) a facilité leur approvisionnement via des voies non sécurisées (par exemple internet) rendant leur contrefaçon plus aisée.  The use and mass distribution of these inks, especially in sectors other than fiduciary printing (pharmacy, decorative paints, toys, etc.), facilitated their supply via unsecured channels (for example the internet), making their counterfeiting easier. .
Les documents US 5 118 349 et WO 2003/053980 notamment, font mention de l'usage de terres rares.  The documents US 5 118 349 and WO 2003/053980 in particular, mention the use of rare earths.
Un certain nombre de composés purement organiques, possédant la propriété de mécanochromisme de luminescence ont été décrits dans la littérature. Dans une revue récente (Chem. Soc. Rev. 2012, DOI: 10.1039/C2CS35016E), ces composés sont présentés.  A number of purely organic compounds possessing the property of luminescence mechanochromism have been described in the literature. In a recent review (Chem Soc Rev. 2012, DOI: 10.1039 / C2CS35016E), these compounds are presented.
Les composés, dits « multi-stimuli », répondant à deux ou plusieurs stimuli sont plus rares et aucun ne répond à la fois à deux propriétés physicochimiques réversibles et distinctes, à savoir le mécanofluorochromisme et le thermofluorochromisme qui peuvent s'exercer soit de manière indépendante, soit de manière complémentaire. Or, ces deux propriétés peuvent s'avérer intéressantes en particulier pour rendre encore plus difficile la fabrication frauduleuse de document de sécurité. Compounds, called "multi-stimuli", responding to two or more stimuli are rarer and none meets both reversible and distinct physicochemical properties, namely mechanofluorochromism and thermofluorochromism that can be exercised either independently or in a complementary manner. However, these two properties can be interesting especially to make even more difficult the fraudulent manufacture of security document.
Par exemple un dérivé du diphényldibenzofulvene (Adv. Mater. For example, a derivative of diphenyldibenzofulvene (Adv Mater.
2011 , 23, 3261 -3265) est fluorescent vert (500 nm), quand il est pur et à l'état solide. Suite à une perturbation mécanique, cette fluorescence est éteinte. Il y a donc perte de la propriété de fluorescence. La fluorescence verte est recouvrée spontanément à température ambiante. La perte de fluorescence est également observée en chauffant le composé à l'état pur à 90° C. Pour revenir à la couleur verte initiale, le composé nécessite un chauffage jusqu'à sa température de fusion (1 8°C) puis un refroidissement rapide. Ces propriétés sont incompatibles avec une utilisation comme constituant d'une encre ou d'un vernis fiduciaire. 2011, 23, 3261-3265) is fluorescent green (500 nm), when it is pure and in the solid state. Following a mechanical disturbance, this fluorescence is extinguished. There is therefore loss of the fluorescence property. The green fluorescence is recovered spontaneously at room temperature. The loss of fluorescence is also observed by heating the compound in pure form at 90 ° C. To return to the initial green color, the compound requires heating up to its melting temperature (18 ° C.) and then cooling. fast. These properties are incompatible with use as a constituent of an ink or a fiducial varnish.
En effet, il est préférable de ne pas chauffer la surface du support (composé + support en phase liquide) à une température équivalente ou supérieure au point de fusion du composé. A cette température, le composé passe en phase liquide et peut réagir avec le support, c'est à dire le matériau, par exemple le billet de banque sur lequel il est apposé. En revenant à l'état solide (à température ambiante), le composé peut changer d'organisation structurale et ainsi perdre ses propriétés au sein du support.  Indeed, it is preferable not to heat the surface of the support (compound + support in the liquid phase) at a temperature equivalent to or greater than the melting point of the compound. At this temperature, the compound passes into the liquid phase and can react with the support, ie the material, for example the banknote on which it is affixed. Returning to the solid state (at room temperature), the compound can change its structural organization and thus lose its properties within the support.
On connaît par ailleurs par le document WO-A-2011 /068537 une famille de composés qui comprend notamment le composé de formule suivante  WO-A-2011/068537 discloses a family of compounds which comprises, in particular, the compound of the following formula:
Une composition qui le contient possède un effet mécanochromique réversible. A composition that contains it has a reversible mechanochromic effect.
Partant de ce produit, le présent demandeur a mis en avant le fait qu'une composition le contenant répond à la fois à deux propriétés physicochimiques réversibles et distinctes précitées, à savoir le mécanofluorochromisme et le thermofluorochromisme qui peuvent s'exercer soit de manière indépendante soit de manière complémentaire. Ainsi, la présente invention se rapporte à un procédé pour vérifier l'authenticité d'un document de sécurité, notamment fiduciaire, qui comporte au moins une zone avec, en son sein ou en surface de cette zone, un composé mécano luminescent réversible de formule : From this product, the present applicant has emphasized the fact that a composition containing it meets both of two reversible and distinct physicochemical properties mentioned above, namely the mechanofluorochromism and the thermofluorochromism which can be exerted either independently or in a complementary way. Thus, the present invention relates to a method for verifying the authenticity of a security document, in particular a fiduciary document, which comprises at least one zone with, within or on the surface of this zone, a reversible mechano-luminescent compound of formula :
où R représente une chaîne alkyle comprenant 1 à 12 atomes de carbone, procédé qui comprend une étape dans laquelle on soumet ladite zone à un rayonnement ultraviolet de sorte que la totalité de ladite zone est visible à l'œil nu sous une première couleur fluorescente, where R represents an alkyl chain comprising 1 to 12 carbon atoms, which method comprises a step in which said zone is subjected to ultraviolet radiation so that all of said zone is visible to the naked eye in a first fluorescent color,
caractérisé par le fait qu'il comprend également une étape qui consiste en un chauffage d'au moins ladite zone à une température d'au moins 50° C, sans la soumettre à la moindre friction ou sollicitation mécanique, la révélation de l'authenticité dudit document étant confirmée par le passage de la dite première couleur à une seconde couleur fluorescente, différente de la première.  characterized in that it also comprises a step which consists of heating at least said zone to a temperature of at least 50 ° C, without subjecting it to the least friction or mechanical stress, revealing the authenticity said document being confirmed by the passage of said first color to a second fluorescent color, different from the first.
Selon d'autres caractéristiques non limitatives et avantageuses de l'invention, prises isolément ou en combinaison quelconque :  According to other nonlimiting and advantageous features of the invention, taken separately or in any combination:
- la température à laquelle est soumise le composé est inférieure à sa température de fusion ;  the temperature at which the compound is subjected is lower than its melting temperature;
- ladite température est comprise entre 50 et 250° C ; said temperature is between 50 and 250 ° C .;
- ledit chauffage de ladite zone à ladite température est opéré pendant une durée comprise entre 1 et 10 secondes ; said heating of said zone to said temperature is carried out for a period of between 1 and 10 seconds;
- il comprend, préalablement à ladite étape de chauffage, une étape au cours de laquelle on soumet une partie de ladite zone à un effort de friction, de sorte que cette partie passe de ladite première couleur fluorescente à ladite seconde couleur fluorescente ;  it comprises, prior to said heating step, a step during which a portion of said zone is subjected to a frictional force, so that this portion passes from said first fluorescent color to said second fluorescent color;
- ledit composé réversible précité est en surface, et 'on l'utilise alors qu'il est intégré au sein d'une encre ou d'un vernis ; - il est mis en œuvre avec un document de sécurité dans lequel ledit composé est recouvert par un vernis, vernis qui recouvre par ailleurs en totalité ou partiellement les impressions figurant sur ce document de sécurité; said reversible compound mentioned above is on the surface, and it is used while it is integrated in an ink or varnish; - It is implemented with a security document in which said compound is covered with a varnish, varnish which otherwise covers all or part of the prints on this security document;
-il est mis en œuvre avec un document de sécurité dans lequel ledit composé est recouvert par un film continu en matériau polymère, destiné à recouvrir en totalité ou partiellement les impressions figurant sur le document de sécurité.  it is implemented with a security document in which said compound is covered by a continuous film of polymeric material, intended to cover all or part of the printouts appearing on the security document.
D'autres caractéristiques et avantages de l'invention apparaîtront à la lecture de la description détaillée qui va suivre. Elle sera faite en référence aux dessins annexés dans lesquels :  Other features and advantages of the invention will appear on reading the detailed description which follows. It will be made with reference to the accompanying drawings in which:
- les figures 1 à 3 sont des vues partielles de dessus d'un billet de banque représenté dans plusieurs états différents correspondant au procédé de l'invention ;  - Figures 1 to 3 are partial top views of a bank note shown in several different states corresponding to the method of the invention;
- la figure 4 est un diagramme présentant les différents phénomènes mis en œuvre conformément à l'invention ;  FIG. 4 is a diagram showing the various phenomena implemented in accordance with the invention;
Aux figures 1 à 3 est représenté schématiquement, vue de face, un document de sécurité qui consiste en un billet de banque 1. Il pourrait toutefois s'agir d'un autre type de document de sécurité tel qu'un visa ou un passeport. Il s'agit donc d'un simple exemple de réalisation.  Figures 1 to 3 are diagrammatically shown, front view, a security document which consists of a bank note 1. It could however be another type of security document such as a visa or a passport. It is therefore a simple example of realization.
Pour des raisons de facilité de lecture des figures, seule la valeur monétaire du billet, en l'occurrence la valeur "10" a été représentée sur cette face visible 2 qui est par exemple la face recto. Bien entendu, ce qui est dit pour la face recto peut être valable pour la face verso 3.  For the sake of ease of reading the figures, only the monetary value of the note, in this case the value "10" has been represented on this visible face 2 which is for example the front face. Of course, what is said for the front face can be valid for the reverse side 3.
Toute ou partie des moyens de sécurité habituellement utilisés dans le domaine fiduciaire (hologramme, fil de sécurité, filigrane, etc.) peuvent être intégrés dans ce billet, mais n'y sont volontairement pas représentés.  All or part of the security means usually used in the fiduciary field (hologram, security thread, watermark, etc.) can be integrated in this ticket, but are not deliberately represented.
Comme indiqué plus haut, la présente invention se rapporte à un procédé pour vérifier l'authenticité d'un document de sécurité, notamment fiduciaire, qui comporte au moins une zone avec, en son sein ou en surface de cette zone, un composé mécano luminescent réversible de formule :  As indicated above, the present invention relates to a method for verifying the authenticity of a security document, in particular a fiduciary document, which comprises at least one zone with, within or on the surface of this zone, a luminescent compound. reversible formula:
où R représente une chaîne alkyle comprenant 1 à 12 atomes de carbone. where R represents an alkyl chain comprising 1 to 12 carbon atoms.
Le procédé de synthèse d'une telle famille de composés est connu en soi, et est notamment décrit dans le document WO-A-2011 /068537 précité. The method for synthesizing such a family of compounds is known per se, and is described in particular in the document WO-A-2011/068537 cited above.
Une composition de type encre ou vernis peut être confectionnée, en faisant usage d'une matrice "taille-douce" incolore ou pratiquement incolore appelée en termes du métier "blanc transparent", notamment disponible auprès de la société SICPA.  An ink or varnish-type composition can be made by using a colorless or virtually colorless "intaglio" matrix called in terms of the "transparent white" art, in particular available from SICPA.
Cette matrice est principalement constituée d'huiles végétales siccatives, de solvants, de résines et d'additifs (charges, siccatifs).  This matrix consists mainly of drying vegetable oils, solvents, resins and additives (fillers, driers).
Un composé répondant à la formule I ci-dessus est introduit dans une telle matrice à un taux compris entre 1 et 10% en poids. Préférentiellement ce taux est de 5%.  A compound of formula I above is introduced into such a matrix at a level of between 1 and 10% by weight. Preferably, this rate is 5%.
Cette encre ou ce vernis est ensuite apposé sur le papier fiduciaire constitutif du billet de banque 1 selon l'une des méthodes connues de l'homme du métier.  This ink or this varnish is then affixed to the fiduciary paper constituting the banknote 1 according to one of the methods known to those skilled in the art.
Dans l'exemple des figures 1 à 3, il s'agit d'un aplat constituant une zone 4 de forme ovale.  In the example of Figures 1 to 3, it is a flat area constituting a zone 4 of oval shape.
Bien entendu, d'autres formes de zones peuvent être envisagées et leur nombre peut être variable.  Of course, other forms of areas may be considered and their number may be variable.
Selon sa structure (variation de la longueur de la chaîne R) et de la nature de la matrice (encre taille douce, encre offset, vernis), le composé I peut présenter différentes couleurs de fluorescence sous irradiation UV (symbolysé R sur les figures).  According to its structure (variation of the length of the chain R) and the nature of the matrix (inks, offset ink, varnish), the compound I may have different colors of fluorescence under UV irradiation (symbolized R in the figures) .
Par exemple, pour un taux de 5% en poids, le composé I comportant 12 atomes de carbone présente une fluorescence de couleur bleue dans une encre taille douce, alors que le composé I avec 6 atomes de carbone présente une fluorescence verte dans cette même matrice. Cette couleur, référencée C1 à la figure 1 est homogène sur tout le vernis ou l'encre.  For example, for a content of 5% by weight, the compound I having 12 carbon atoms has a blue color fluorescence in a soft ink, while the compound I with 6 carbon atoms has a green fluorescence in this same matrix . This color, referenced C1 in Figure 1 is homogeneous throughout the varnish or ink.
Cette situation, connue de l'état de la technique, correspond à l'état A de la figure récapitulative 4.  This situation, known from the state of the art, corresponds to the state A of the summary figure 4.
Pour ces deux composés, dès lors que l'on soumet une partie de la zone 4 à une friction (par exemple à l'aide de la tranche d'une pièce de monnaie, d'un objet contendant, etc.). La fluorescence passe de la couleur C1 bleue à la couleur C2 jaune (figure 2). En référence à la figure 4, ceci correspond au passage de l'état A à l'état B. I l est donc possible "d 'écrire" sur la surface et de révéler "l'écriture" réalisée par irradiation UV. For these two compounds, as soon as one part of zone 4 is subjected to friction (for example using the edge of a coin, a contending object, etc.). Fluorescence changes from blue C1 color to yellow C2 color (Figure 2). With reference to FIG. 4, this corresponds to the transition from state A to state B. It is therefore possible to "write" on the surface and to reveal "the writing" carried out by UV irradiation.
Le changement de couleur de fluorescence est observé uniquement dans la partie perturbée mécaniquement. Le caractère réversible de cette propriété fait que "l'écriture" s'efface d 'elle-même à température ambiante en quelques minutes ou en quelques secondes en chauffant (30-50° C), comme le montre la figure 4.  The fluorescence color change is observed only in the mechanically disturbed part. The reversible nature of this property makes "writing" self-erasing at room temperature in a matter of minutes or seconds by heating (30-50 ° C), as shown in Figure 4.
Selon l'invention, il est possible d'améliorer encore la vérification de l'authenticité du document de sécurité en mettant en œuvre une étape de chauffage d'au moins ladite zone 4 à une température d'au moins 50° C.  According to the invention, it is possible to further improve the verification of the authenticity of the security document by implementing a heating step of at least said zone 4 at a temperature of at least 50 ° C.
En effet, pour ces composés, un apport de chaleur permet d 'induire un changement de la couleur de fluorescence sur toute la surface soumise à ce stimulus thermique. C'est la situation de la figure 3 et cela correspond au passage de l'état A à l'état C de la figure 4.  Indeed, for these compounds, a heat input makes it possible to induce a change in the fluorescence color over the entire surface subjected to this thermal stimulus. This is the situation of FIG. 3 and this corresponds to the transition from state A to state C of FIG.
Un arrêt du chauffage puis une reprise de celui-ci à une température de l'ordre de 30 à 50° C permet de revenir à l'état A.  Stopping the heating and then resuming it at a temperature of the order of 30 to 50 ° C allows to return to the state A.
I l est à noter que l'état C, bien que fluorescent, ne présente plus la propriété de mécanofluorochromisme. Autrement dit, même si la zone est soumise à une friction, elle ne change pas localement de couleur.  It should be noted that state C, although fluorescent, no longer has the property of mechanofluorochromism. In other words, even if the area is subject to friction, it does not change color locally.
La zone 4 présentant l'état B représenté à la figure 4 (obtenu par friction) peut être chauffée (à au moins 50° C) afin de passer à l'état C. Le retour à l'état initial A se fait par la méthode précitée de chauffage à faible température (30° -50° C).  The zone 4 having the state B shown in FIG. 4 (obtained by friction) can be heated (to at least 50 ° C.) in order to go to the state C. The return to the initial state A is done by the aforementioned method of heating at low temperature (30 ° -50 ° C).
Le temps de chauffage à ladite température supérieure à 50° C est généralement compris entre 1 et 10 secondes.  The heating time at said temperature above 50 ° C is generally between 1 and 10 seconds.
Bien entendu, il est important que la température atteinte par la zone 4 soit inférieure à la température de fusion du composé I .  Of course, it is important that the temperature reached by zone 4 is lower than the melting temperature of compound I.
Ainsi, la température de fusion du produit pur dans lequel est de 1 58° C. Thus, the melting temperature of the pure product in which is 1 58 ° C.
Cette température est variable en fonction de la longueur du groupement R.  This temperature is variable depending on the length of the group R.
Le présent procédé permet d'obtenir un changement significatif de couleur de fluorescence, soit par friction, soit par apport de chaleur, ainsi qu'une perte de la propriété de mécanofluorochromisme par chauffage. Dans le domaine fiduciaire, il est courant d'appliquer sur le document de sécurité un vernis, qui recouvre en totalité ou partiellement les impressions et/ou autres éléments de sécurité figurant sur le document. The present method provides a significant change in fluorescence color, either by friction or by heat input, as well as a loss of the mechanofluorochromic property by heating. In the fiduciary field, it is common practice to apply a varnish to the security document, which covers all or part of the printouts and / or other security features on the document.
Dans une variante, on applique un film continu en matériau polymère, destiné à recouvrir en totalité ou partiellement les impressions figurant sur le document de sécurité.  In a variant, a continuous film of polymeric material is applied, intended to completely or partially cover the impressions appearing on the security document.
Dans les deux cas, ce revêtement a une fonction protectrice.  In both cases, this coating has a protective function.
Pour autant que l'épaisseur de ce revêtement ne soit pas trop importante, les phénomènes expliqués plus haut sont constatés, malgré la présence dudit revêtement.  As long as the thickness of this coating is not too great, the phenomena explained above are noted, despite the presence of said coating.
Sur le plan pratique, l'homme de la rue ou le commerçant pourra constater la fluorescence de la zone à l'aide d'une lampe UV et vérifier par friction, le changement de couleur.  In practical terms, the man in the street or the trader can see the fluorescence of the area using a UV lamp and check by friction, the color change.
Il pourra être mis à disposition des banques un appareil combinant une lampe UV et un moyen de chauffage pour mettre en œuvre le présent procédé.  A device combining a UV lamp and a heating means may be made available to the banks for implementing the present method.
Un tel appareil peut également être intégré au sein d'une machine automatique de tri de billets.  Such a device can also be integrated within an automatic ticket sorting machine.
Bien entendu, des outils simples tels qu'un sèche-cheveux ou un décapeur thermique peuvent être utilisés.  Of course, simple tools such as a hair dryer or a heat gun can be used.

Claims

REVENDICATIONS
1 . Procédé pour vérifier l'authenticité d'un document de sécurité (1 ), notamment fiduciaire, qui comporte au moins une zone (4) avec, en son sein ou en surface de cette zone, un composé mécano luminescent réversible de formule : 1. A method for verifying the authenticity of a security document (1), in particular fiduciary, which comprises at least one zone (4) with, within or on the surface of this zone, a reversible mechano-luminescent compound of formula:
où R représente une chaîne alkyle comprenant 1 à 12 atomes de carbone, procédé qui comprend une étape dans laquelle on soumet ladite zone (4) à un rayonnement ultraviolet (R) de sorte que la totalité de ladite zone est visible à l'œil nu sous une première couleur fluorescente (C1 ), where R represents an alkyl chain comprising 1 to 12 carbon atoms, which process comprises a step in which said zone (4) is subjected to ultraviolet radiation (R) so that the whole of said zone is visible to the naked eye in a first fluorescent color (C1),
caractérisé par le fait qu'il comprend également une étape qui consiste en un chauffage d'au moins ladite zone (4) à une température d'au moins 50° C, sans la soumettre à la moindre friction ou sollicitation mécanique, la révélation de l'authenticité dudit document (1 ) étant confirmée par le passage de la dite première couleur (C1 ) à une seconde couleur fluorescente (C2), différente de la première. characterized in that it also comprises a step which consists of heating at least said zone (4) to a temperature of at least 50 ° C, without subjecting it to the least friction or mechanical stress, the revelation of the authenticity of said document (1) being confirmed by the passage of said first color (C1) to a second fluorescent color (C2), different from the first.
2. Procédé selon la revendication 1 , caractérisé par le fait que la température à laquelle est soumise le composé est inférieure à sa température de fusion.  2. Method according to claim 1, characterized in that the temperature at which the compound is subjected is below its melting temperature.
3. Procédé selon la revendication 1 , caractérisé par le fait que ladite température est comprise entre 50 et 250° C.  3. Method according to claim 1, characterized in that said temperature is between 50 and 250 ° C.
4. Procédé selon l'une des revendications précédentes, caractérisé par le fait que ledit chauffage de ladite zone (4) à ladite température est opéré pendant une durée comprise entre 1 et 10 secondes.  4. Method according to one of the preceding claims, characterized in that said heating said zone (4) at said temperature is operated for a period of between 1 and 10 seconds.
5. Procédé selon l'une des revendications précédentes, caractérisé par le fait qu'il comprend, préalablement à ladite étape de chauffage, une étape au cours de laquelle on soumet une partie de ladite zone (4) à un effort de friction, de sorte que cette partie passe de ladite première couleur fluorescente (C1 ) à ladite seconde couleur fluorescente (C2). 5. Method according to one of the preceding claims, characterized in that it comprises, prior to said heating step, a step during which is subjected a portion of said zone (4) to a friction force, of so that this portion passes from said first fluorescent color (C1) to said second fluorescent color (C2).
6. Procédé selon l'une des revendications précédentes, dans lequel ledit composé réversible précité est en surface, caractérisé par le fait qu'on l'utilise alors qu'il est intégré au sein d'une encre ou d'un vernis. 6. Method according to one of the preceding claims, wherein said reversible compound mentioned above is on the surface, characterized in that it is used while it is integrated in an ink or varnish.
7. Procédé selon l'une des revendications précédentes, caractérisé en ce qu'il est mis en œuvre avec un document de sécurité dans lequel ledit composé est recouvert par un vernis, vernis qui recouvre par ailleurs en totalité ou partiellement les impressions figurant sur ce document de sécurité (1 ).  7. Method according to one of the preceding claims, characterized in that it is implemented with a security document in which said compound is covered with a varnish, varnish which otherwise covers all or part of the prints on this security document (1).
8. Procédé selon l'une des revendications précédentes caractérisé en ce qu'il est mis en œuvre avec un document de sécurité dans lequel ledit composé est recouvert par un film continu en matériau polymère, destiné à recouvrir en totalité ou partiellement les impressions figurant sur le document de sécurité (1 ).  8. Method according to one of the preceding claims characterized in that it is implemented with a security document in which said compound is covered by a continuous film of polymeric material, intended to completely or partially cover the prints on the security document (1).
EP13802970.7A 2012-12-14 2013-12-11 Method for checking the authenticity of a security document Active EP2932480B1 (en)

Priority Applications (1)

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FR1262083A FR2999764B1 (en) 2012-12-14 2012-12-14 METHOD FOR VERIFYING THE AUTHENTICITY OF A SECURITY DOCUMENT
PCT/EP2013/076152 WO2014090839A1 (en) 2012-12-14 2013-12-11 Method for checking the authenticity of a security document

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CN112785911A (en) * 2021-01-22 2021-05-11 深圳前海蓝莓文化传播有限公司 Luminous anti-counterfeit label and preparation method thereof

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ZA201504225B (en) 2019-12-18
FR2999764A1 (en) 2014-06-20
CN105051796A (en) 2015-11-11
FR2999764B1 (en) 2017-08-25
BR112015013941B1 (en) 2021-12-07
EP2932480B1 (en) 2018-08-08
PL2932480T3 (en) 2019-01-31
CN105051796B (en) 2017-09-01
AU2013357384A1 (en) 2015-07-02
KR102087329B1 (en) 2020-03-10
CA2894419C (en) 2021-02-23
CA2894419A1 (en) 2014-06-19
RU2627873C2 (en) 2017-08-14
KR20150116822A (en) 2015-10-16
AU2013357384B2 (en) 2017-05-11
RU2015128257A (en) 2017-01-18
BR112015013941A2 (en) 2017-07-11

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