EP0609493A1 - Substrate protected against unwanted copying and method of preparation of this substrate - Google Patents

Substrate protected against unwanted copying and method of preparation of this substrate Download PDF

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Publication number
EP0609493A1
EP0609493A1 EP93116545A EP93116545A EP0609493A1 EP 0609493 A1 EP0609493 A1 EP 0609493A1 EP 93116545 A EP93116545 A EP 93116545A EP 93116545 A EP93116545 A EP 93116545A EP 0609493 A1 EP0609493 A1 EP 0609493A1
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Prior art keywords
colorant
information
substrates according
substrate
color
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EP93116545A
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German (de)
French (fr)
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EP0609493B1 (en
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Horst Dr. Berneth
Uwe Dr. Claussen
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Bayer AG
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Bayer AG
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M3/00—Printing processes to produce particular kinds of printed work, e.g. patterns
    • B41M3/14—Security printing
    • B41M3/144—Security printing using fluorescent, luminescent or iridescent effects
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03C—PHOTOSENSITIVE MATERIALS FOR PHOTOGRAPHIC PURPOSES; PHOTOGRAPHIC PROCESSES, e.g. CINE, X-RAY, COLOUR, STEREO-PHOTOGRAPHIC PROCESSES; AUXILIARY PROCESSES IN PHOTOGRAPHY
    • G03C5/00—Photographic processes or agents therefor; Regeneration of such processing agents
    • G03C5/08—Photoprinting; Processes and means for preventing photoprinting
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S283/00—Printed matter
    • Y10S283/902—Anti-photocopy
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S428/00—Stock material or miscellaneous articles
    • Y10S428/914—Transfer or decalcomania
    • Y10S428/915—Fraud or tamper detecting
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S428/00—Stock material or miscellaneous articles
    • Y10S428/916—Fraud or tamper detecting
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
    • Y10T428/24802—Discontinuous or differential coating, impregnation or bond [e.g., artwork, printing, retouched photograph, etc.]
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
    • Y10T428/24802—Discontinuous or differential coating, impregnation or bond [e.g., artwork, printing, retouched photograph, etc.]
    • Y10T428/24835—Discontinuous or differential coating, impregnation or bond [e.g., artwork, printing, retouched photograph, etc.] including developable image or soluble portion in coating or impregnation [e.g., safety paper, etc.]
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
    • Y10T428/24802—Discontinuous or differential coating, impregnation or bond [e.g., artwork, printing, retouched photograph, etc.]
    • Y10T428/24893—Discontinuous or differential coating, impregnation or bond [e.g., artwork, printing, retouched photograph, etc.] including particulate material
    • Y10T428/24901—Discontinuous or differential coating, impregnation or bond [e.g., artwork, printing, retouched photograph, etc.] including particulate material including coloring matter
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
    • Y10T428/24802—Discontinuous or differential coating, impregnation or bond [e.g., artwork, printing, retouched photograph, etc.]
    • Y10T428/24934—Discontinuous or differential coating, impregnation or bond [e.g., artwork, printing, retouched photograph, etc.] including paper layer

Abstract

Neue Substrate mit darauf angebrachten sichtbaren Informationen ergeben nicht identifizierbare, beispielsweise nicht lesbare Fotokopien, wenn zur Anbringung der Informationen Farbmittelkombinationen aus mindestens einem emittierenden und mindestens einem remittierenden Farbmittel eingesetzt werden, deren Farbnuance beim Betrachten bei nicht wahrgenommener Fluoreszenz ähnlich oder gleich ist.New substrates with visible information attached to them result in non-identifiable, for example unreadable photocopies, if colorant combinations of at least one emitting and at least one remitting colorant are used to attach the information, the color shade of which is similar or the same when viewed with unnoticed fluorescence.

Description

Die Erfindung betrifft gegen unbefugtes Kopieren geschützte Substrate und Verfahren zu ihrer Herstellung.The invention relates to substrates protected against unauthorized copying and to processes for their production.

Schon lange besteht der Wunsch, einen wirksamen Schutz gegen unbefugtes Kopieren zu bekommen. So gibt es in der Literatur eine ganze Reihe verschiedener Vorschläge. Die meisten von ihnen beruhen darauf, den Untergrund der Vorlage einzufärben, um den Kontrast herabzusetzen. Da das Auge und der Sensor in der Maschine verschiedene Empfindlichkeiten für die Hellwerte der Farben haben, wurde versucht, den Hintergrund beim Kopieren für den Sensor relativ stärker zu verdunkeln als für das Auge. Hierfür sind sowohl remittierende Farbstoffe, insbesondere Rotnuancen, als auch fluoreszierende Farbstoffe genannt worden. Einen anderen Weg beschreibt beispielsweise die US-Patentschrift 4 427 627. Hier wird die Vorlage mit einer photoelektrisch schaltbaren Schicht überzogen, die beim Belichten dunkel wird. Der Nachteil hiervon ist jedoch der, daß sich die Vorlage im hellen Licht nicht mehr lesen läßt. Alle diese Vorschläge haben sich nicht durchsetzen können, wohl deshalb, weil alles Sehen auf der Wahrnehmung von Kontrasten beruht, weswegen es immer schwierig sein wird, die Lesbarkeit der Vorlage und ihre Kopiersicherheit durch die Verminderung des Kontrasts in Übereinstimmung zu bekommen. Letztlich ist nur eine unlesbare Vorlage auch kopiersicher.It has long been desired to have effective protection against unauthorized copying. There are a number of different suggestions in the literature. Most of them rely on coloring the background of the original to reduce the contrast. Since the eye and the sensor in the machine have different sensitivities for the brightness values of the colors, attempts were made to darken the background when copying for the sensor relatively more than for the eye. Both remitting dyes, in particular shades of red, and fluorescent dyes have been mentioned for this. Another way is described, for example, in US Pat. No. 4,427,627. Here, the original is coated with a photoelectrically switchable layer, which becomes dark when exposed. The disadvantage of this, however, is that the original is bright Light can no longer be read. All these suggestions have not been able to prevail, probably because all seeing is based on the perception of contrasts, which is why it will always be difficult to match the readability of the original and its copy security by reducing the contrast. Ultimately, only an illegible template is copy-proof.

Mit der Einführung der Farbkopierer hat sich das Problem weiter verschärft. Farben vermitteln schnell erkennbare Informationen und werden deswegen zur Kennzeichnung, Identifikation, Sicherung von Gegenständen usw. vielfach verwendet. Ein besonderes Problem ist die Nachahmung von Wertpapieren, Ausweisen o.ä. durch Farbkopien.With the introduction of color copiers, the problem has become more acute. Colors convey quickly recognizable information and are therefore widely used for identification, identification, securing of objects, etc. A particular problem is the imitation of securities, ID cards or the like. through color copies.

Erfindungsgemäß wird nun ein neues Verfahren zum Kopierschutz farbiger Vorlagen vorgestellt, das den Unterschied in der Empfindlichkeit des Auges und des in der Maschine befindlichen Sensors in einer überraschenden Weise ausnutzt. Während das Auge Remissions- und Emissionsstrahlung nicht unterscheidet, und beide als Gesamt-Farbeindruck wahrnimmt, mißt der Sensor nur die Absorption und ist blind gegenüber der Emissionsstrahlung. Dies führt zu einem Unterschied in der Farbortbestimmung gegenüber dem augenoptischen Eindruck und dem überraschenden Effekt der Farbidentität für das Auge oder den Sensor.According to the invention, a new method for copy protection of colored originals is now presented, which takes advantage of the difference in the sensitivity of the eye and the sensor located in the machine in a surprising manner. While the eye does not distinguish between remission and emission radiation, and perceives both as an overall color impression, the sensor only measures the absorption and is blind to the emission radiation. This leads to a difference in the color location determination compared to the optical impression and the surprising effect of the color identity for the eye or the sensor.

Da man den brillanten Farbeindruck einer Fluoreszenzfarbe nicht durch Mischen von Remissionsfarben nachstellen kann, bleibt dieser Unterschied auch dann erhalten, wenn man das Bild örtlich korrigiert, beispielsweise durch Korrektur der Filtereinstellungen. Er ließe sich nur durch einen Toner ausgleichen, der einen fluoreszenzfähigen Farbstoff enthält. Dazu bedürfte es aber eines Sensorsystemes, das zwischen emittierenden und remittierenden Farben unterscheidet.Since the brilliant color impression of a fluorescent color cannot be reproduced by mixing remission colors, this difference remains even if if you correct the image locally, for example by correcting the filter settings. It could only be compensated for by a toner that contains a fluorescent dye. This would require a sensor system that differentiates between emitting and remitting colors.

Die Wahrnehmbarkeit einer Farbortänderung mit dem Auge ist relativ. Gegen einen Vergleich mit der Ausgangsnuance können sehr kleine Änderungen noch sicher erkannt werden, während man beim Fehlen vergleichbarer Nuancen selbst relativ große Änderungen, insbesondere in der Helligkeit, nicht mehr sicher sieht.The perception of a change in color location with the eye is relative. By comparison with the initial nuance, very small changes can still be recognized with certainty, whereas in the absence of comparable nuances even relatively large changes, especially in the brightness, can no longer be seen with certainty.

Die Erfindung ist nun darauf gerichtet, ein emittierendes und einen remittierendes Farbmittel so auszuwählen, daß die Nuance beim Betrachten bei nicht wahrgenommener Fluoreszenz ähnlich oder gleich ist.The invention is now directed to selecting an emitting and a remitting colorant in such a way that the nuance when viewed when fluorescence is not perceived is similar or identical.

Die Erfindung betrifft Substrate mit darauf angebrachten sichtbaren Informationen, die gegen unbefugtes Kopieren geschützt sind, die dadurch gekennzeichnet sind, daß man zur Anbringung der Informationen eine solche Farbmittelkombination aus mindestens einem emittierenden und mindestens einem remittierenden Farbmittel einsetzt, deren Farbnuance beim Betrachten bei nicht wahrgenommener Fluoreszenz ähnlich oder gleich ist, wobei die Information so durch die Farbmittelkombination aufgebracht ist, daß die verschiedenen Farbfelder sich berühren oder nahe beieinander liegen.The invention relates to substrates with visible information thereon, which are protected against unauthorized copying, which are characterized in that such a colorant combination of at least one emitting and at least one remitting colorant is used to apply the information, the color shade of which is observed when the fluorescence is not perceived is similar or the same, the information being applied by the colorant combination such that the different color fields touch or are close to one another.

Die Erfindung betrifft weiter Verfahren zum Schutz von Substraten mit darauf angebrachten sichtbaren Informationen gegen unbefugtes Kopieren, das dadurch gekennzeichnet ist, daß zur Anbringung der Informationen eine solche Farbmittelkombination aus mindestens einem emittierenden und mindestens einem remittierenden Farbmittel eingesetzt wird, deren Farbnuance beim Betrachten bei nicht wahrgenommenen Fluoreszenz ähnlich oder gleich ist, wobei die Information so durch die Farbmittelkombination aufgebracht ist, daß die verschiedenen Farbfelder sich berühren oder nahe beieinander liegen.The invention further relates to methods for protecting substrates with visible information attached to them against unauthorized copying, which is characterized in that such a colorant combination of at least one emitting and at least one remitting colorant is used to apply the information, the color shade of which is observed when not being perceived Fluorescence is similar or the same, the information being applied by the colorant combination so that the different color fields touch or are close to one another.

Bei einem erfindungsgemäßen Substrat erscheint ein aus einer erfindungsgemäßen Farbmittelkombination gefertigtes Muster, wenn im Original erkennbar, in der Kopie als monochromer Fleck. Man kann hierzu mehrere Farbmittelkombinationen gleichzeitig verwenden, um komplexe Farbmuster herzustellen.In the case of a substrate according to the invention, a pattern made from a colorant combination according to the invention, if recognizable in the original, appears in the copy as a monochrome spot. You can use multiple colorant combinations at the same time to create complex color samples.

Das Remissionsfarbmittel kann aus mehreren Farbmitteln zusammengesetzt sein, woraus sich die Möglichkeit einer exakten Anpassung der Nuance an das Retroreflexionsspektrum des emissiven Partner ergibt.The reflective colorant can be composed of several colorants, which results in the possibility of an exact adaptation of the shade to the retroreflection spectrum of the emissive partner.

Geeignete Farbmittel für Kombinationen sind in der Regel so beschaffen, daß ihre Absorptionsspektren in Lage und Bandenform ähnlich aussehen. Die Absorptionsmaxima sollen nicht mehr als 30 nm, vorzugsweise nicht mehr 20 nm auseinander liegen. Die Halbwellenbreite der Farbstoffe in Lösung, d.h. die spektrale Breite der längstwelligen Bande bei halber Maximalextinktion (ε/2 bei λmax.) sollte <150 nm, bevorzugt <100 nm betragen.Suitable colorants for combinations are usually designed so that their absorption spectra look similar in position and band shape. The absorption maxima should not be more than 30 nm apart, preferably no more than 20 nm apart. The half-wave width of the dyes in solution, ie the spectral width of the longest-wave band at half maximum extinction (ε / 2 at λ max. ) Should be <150 nm, preferably <100 nm.

Auch das Fluoreszenzfarbmittel kann aus Mischungen bestehen, die allerdings so aufgebaut sein müssen, daß innerhalb der Emissionsbande keine Absorption eintritt. Vorzugsweise wird es sich um Farbmittel handeln, die ähnlich wie das Remissionsfarbmittel absorbieren.The fluorescent colorant can also consist of mixtures, which, however, must be structured in such a way that no absorption occurs within the emission band. It will preferably be colorants which absorb similarly to the reflective colorant.

Eine Anwendungsform der Erfindung besteht darin, auf Papier mit dem emittierenden und dem remittierenden Farbmittelein Muster zu drucken, indem die mit den verschiedenen Farbmitteln bedruckten Flächen sich berühren oder nahe beieinander liegen sollen. Die Druckfarbe enthält die Farbmittel als Farbpigmente oder als mit Farbstoffen eingefärbte Kunststoffpulver oder Polymerdispersionen in für Druckfarben üblichen Bindemitteln. Die Druckfarbe kann auch die Farbstoffe in gelöster Form enthaltenOne form of application of the invention is to print a pattern on paper with the emitting and remitting colorant by making the areas printed with the different colorants touch or be close to each other. The printing ink contains the colorants as color pigments or as plastic powders colored with dyes or polymer dispersions in binders customary for printing inks. The printing ink can also contain the dyes in dissolved form

Geeignete Kunststoffpulver sind beispielsweise Polyacrylnitril, Polyester, Polycarbonat, Epoxi-Harze, Melamin-Formaldehyd-Harze; geeignete Dispersionen sind beispielsweise Styrolacrylate, Polyurethane oder Polyharnstoffe.Suitable plastic powders are, for example, polyacrylonitrile, polyester, polycarbonate, epoxy resins, melamine-formaldehyde resins; Suitable dispersions are, for example, styrene acrylates, polyurethanes or polyureas.

Geeignete Pigmente sind alle Farbpigmente, vorzugsweise organische Farbpigmente. Eine besondere Form sind die Salze kationischer Farbstoffe mit schwerlöslich machenden Säuren wie Molybdatophosphat, Wolframatophosphat, Molybdatosilikat, Wolframatosilikat oder geeigneten organischen Carbon- oder Sulfonsäuren.Suitable pigments are all color pigments, preferably organic color pigments. A special form are the salts of cationic dyes with poorly solubilizing acids such as molybdate phosphate, tungsten phosphate, molybdate silicate, tungsten silicate or suitable organic carbon or sulfonic acids.

Geeignete Farbstoffe zum Einfärben der Kunststoffpulvern oder Polymerdispersionen sind alle neutralen oder kationischen Farbstoffe, die sich in diesen Medien lösen oder sie durch Salzbildung gut anfärben oder die über reaktive Gruppen in das Polymer eingebaut werden können.Suitable dyes for coloring the plastic powders or polymer dispersions are all neutral or cationic dyes that dissolve in these media or stain them well through salt formation or that can be incorporated into the polymer via reactive groups.

Eine andere Form der Anwendung der Erfindung besteht darin, daß man Papier mit dem einen Farbstoff einfärbt und mit dem anderen ein Muster aufdruckt. Vorzugsweise wird zur Färbung des Papieres der remittierende Farbstoff verwendet. Die Druckfarbe kann wie oben beschrieben aufgebaut sein. Ebenso kann als Druckfarbe eine Lösung des Farbstoffs in mikroverkapselter Form eingesetzt werden.Another form of application of the invention is to dye paper with one dye and to print a pattern with the other. The remitting dye is preferably used for coloring the paper. The printing ink can be constructed as described above. A solution of the dye in microencapsulated form can also be used as the printing ink.

Geeignete Farbstoffe zum Färben des Papiers sind alle kationischen oder anionischen Farbstoffe, die eine Affinität zur Cellulosefaser haben. Geeignete Farbstoffe für Mikrokapseln sind alle neutralen Farbstoffe, die sich in den zur Mikroverkapselung üblichen Lösungsmitteln, wie aliphatischen, aromatischen und chlorierten Kohlenwasserstoffen, ausreichend lösen. Neben Papier kommen alle papierähnlichen Stoffe, wie Vliese, aber auch Kunststoffolien, in Frage. Bevorzugt ist Papier.Suitable dyes for dyeing the paper are all cationic or anionic dyes that have an affinity for cellulose fiber. Suitable dyes for microcapsules are all neutral dyes which dissolve sufficiently in the solvents customary for microencapsulation, such as aliphatic, aromatic and chlorinated hydrocarbons. In addition to paper, all paper-like materials, such as nonwovens, but also plastic films, can be used. Paper is preferred.

Beispiel 1example 1

  • a) 20 g Polyacrylnitrilpulver wurden in Wasser bei pH = 4 mit 150 mg des Farbstoffs der Formel
    Figure imgb0001
     bei 90°C gefärbt und anschließend getrocknet.    a) 20 g of polyacrylonitrile powder were in water at pH = 4 with 150 mg of the dye of the formula
    Figure imgb0001
     dyed at 90 ° C and then dried.
  • b) Analog verfuhr man unter Verwendung von 110 mg des Farbstoffs der Formel
    Figure imgb0002
         b) The procedure was analogous using 110 mg of the dye of the formula
    Figure imgb0002
  • c) 1 g des unter b) gefärbten Pulvers wurden in 6 g 5 %iger wäßriger Polyvinylalkohollösung dispergiert. Mit einem Pinsel wurde auf Papier die Zahl "10" geschrieben.c) 1 g of the powder colored under b) was dispersed in 6 g of 5% aqueous polyvinyl alcohol solution. The number "10" was written on paper with a brush.
  • d) Mit einer wie unter c) hergestellten Dispersion des Pulvers aus a) wurde mit einem Pinsel ein viereckiges Feld um die Zahl "10" und der Innenraum der "0" so bemalt, daß dieses Feld unmittelbar an die Ziffern anstieß.d) With a dispersion of the powder from a) prepared as in c), a square field around the number "10" and the interior of the "0" were painted with a brush so that this field immediately abutted the digits.
  • e) Das Auge konnte die "10" deutlich grünstichig gelb fluoreszierend in der gelben Umgebung lesen.e) The eye could read the "10" clearly greenish yellow fluorescent in the yellow environment.
  • f) Auf einem Farbkopierer wurde eine Farbkopie dieser Vorlage hergestellt. Das ganze Feld inklusive der Zahl "10" wurde in einem einheitlichen Gelb wiedergegeben, sodaß die "10" nicht mehr erkannt werden konntef) A color copy of this template was made on a color copier. The whole field including the number "10" was displayed in a uniform yellow so that the "10" could no longer be recognized
Beispiel 2Example 2

Die Zahl "10" wurde mit der Dispersion aus c) des Beispiels 1, das umgebende Feld mit der Dispersion aus d) des Beispiels 1 gemalt. Auch hier konnte das Auge die Zahl klar lesen, sie verschwand aber auf der Farbkopie.The number "10" was painted with the dispersion from c) of Example 1, the surrounding field with the dispersion from d) of Example 1. Here, too, the eye could read the number clearly, but it disappeared on the color copy.

Beispiele 3-7Examples 3-7

Die Vorgehensweise entsprach den Beispielen 1 und 2. Es wurden folgende Farbstoffpaare eingesetzt:

Figure imgb0003
Figure imgb0004
 The procedure corresponded to Examples 1 and 2. The following dye pairs were used:
Figure imgb0003
Figure imgb0004

Beispiel 8Example 8

  • a) 100 mg des Farbstoffs der Formel
    Figure imgb0005
     wurden in 100 ml einer 5 %igen Lösung von Polyvinylacetat in Aceton gelöst. Mit einem Pinsel wurde auf Papier die Zahl "10" gemalt.    a) 100 mg of the dye of the formula
    Figure imgb0005
     were dissolved in 100 ml of a 5% solution of polyvinyl acetate in acetone. The number "10" was painted on paper with a brush.
  • b) Entsprechend wurde mit einer Lösung des Farbstoffs der Formel
    Figure imgb0006
     der Innenraum der "0" und ein viereckiges Feld um die "10" so angemalt, daß kein Zwischenraum zwischen den bemalten Flächen entstand.    b) Correspondingly with a solution of the dye of the formula
    Figure imgb0006
     the interior of the "0" and a square field around the "10" painted so that there was no space between the painted surfaces.
  • c) Das Auge konnte die gelbe "10" deutlich in dem grünstichig gelb fluoreszierenden Umfeld lesen.c) The eye could read the yellow "10" clearly in the greenish yellow fluorescent environment.
  • d) Eine auf einem Farbkopierer hergestellte Farbkopie dieser Vorlage zeigte jedoch nur ein einheitlich gelbes Feld, in dem die "10" nicht zu erkennen war.d) However, a color copy of this template made on a color copier only showed a uniform yellow field in which the "10" was not recognizable.

Analog können die in den Beispielen 3-7 verwendeten Farbstoffe eingesetzt werden.The dyes used in Examples 3-7 can be used analogously.

Beispiel 9Example 9

  • a) 20 g Polyesterpulver wurden in Wasser mit 120 mg des Farbstoffs der Formel
    Figure imgb0007
     bei 100°C gefärbt und anschließend getrocknet.    a) 20 g of polyester powder were in water with 120 mg of the dye of the formula
    Figure imgb0007
     dyed at 100 ° C and then dried.
  • b) Analog verfuhr man mit 250 mg des Farbstoffs der Formel
    Figure imgb0008
         b) The procedure was analogous to 250 mg of the dye of the formula
    Figure imgb0008
  • c) 1 g des unter a) gefärbten Pulvers wurden in 6 g 5 %igem wäßrigem Polyvinylalkohol dispergiert. Mit einem Pinsel wurde auf Papier eine "2" gemalt.c) 1 g of the powder colored under a) was dispersed in 6 g of 5% aqueous polyvinyl alcohol. A "2" was painted on paper with a brush.
  • d) Mit einer wie unter c) hergestellten Dispersion des Pulvers aus b) wurde um die Zahl "2" ein viereckiges Feld so gemalt, daß die beiden farbigen Flächen ohne Zwischenraum aneinander stießen.d) With a dispersion of the powder from b) prepared as under c), a square field was painted by the number "2" in such a way that the two colored surfaces abutted against one another without any space.
  • e) Mit dem Auge konnte eine grünstichig-gelbfluoreszierende "2" in der gelben Umgebung deutlich erkannt werden.e) A greenish-yellow fluorescent "2" in the yellow environment could be clearly recognized with the eye.
  • f) Eine auf einem Farbkopierer hergestellte Farbkopie zeigte ein einheitlich gelbes Feld, in dem die "2" nicht mehr zu sehen war.f) A color copy made on a color copier showed a uniform yellow field in which the "2" was no longer visible.

Claims (9)

Substrate mit darauf angebrachten sichtbaren Informationen, die gegen unbefugtes Kopieren geschützt sind, dadurch gekennzeichnet, daß man zur Anbringung der Informationen eine solche Farbmittelkombination aus mindestens einem emittierenden und mindestens einem remittierenden Farbmittel einsetzt, deren Farbnuance beim Betrachten bei nicht wahrgenommener Fluoreszenz ähnlich oder gleich ist, wobei die Information so durch die Farbmittelkombination aufgebracht ist, daß die verschiedenen Farbfelder sich berühren oder nahe beieinander liegen.Substrates with visible information attached to them, which are protected against unauthorized copying, characterized in that for the attachment of the information such a colorant combination of at least one emitting and at least one remitting colorant is used, the color shade of which, when viewed when fluorescence is not perceived, is similar or identical, wherein the information is applied by the colorant combination so that the different color fields touch or are close to each other. Verfahren zum Schutz von Substraten mit darauf angebrachten sichtbaren Informationen gegen unbefugtes Kopieren, dadurch gekennzeichnet, daß zur Anbringung der Informationen eine solche Farbmittelkombination aus mindestens einem emittierenden und mindestens einem remittierenden Farbmittel eingesetzt wird, deren Farbnuance beim Betrachten bei nicht wahrgenommener Fluoreszenz ähnlich oder gleich ist, wobei die Information so durch die Farbmittelkombination aufgebracht ist, daß die verschiedenen Farbfelder sich berühren oder nahe beieinander liegen.A method for protecting substrates with visible information attached to them against unauthorized copying, characterized in that a colorant combination of at least one emitting and at least one remitting colorant is used to attach the information, the color shade of which is similar or identical when viewed when fluorescence is not perceived, wherein the information is applied by the colorant combination so that the different color fields touch or are close to each other. Substrate nach Anspruch 1, dadurch gekennzeichnet, daß mehr als ein Remissionsfarbmittel eingesetzt wird.Substrates according to claim 1, characterized in that more than one remission colorant is used. Substrate nach Anspruch 1, bestehend aus Papier oder papierähnlichen Stoffen.Substrates according to claim 1, consisting of paper or paper-like substances. Substrate nach Anspruch 4, dadurch gekennzeichnet, daß der oder die Remissionsfarbstoff(e) durch direkte Einfärbung und der oder die Emissionsfarbstoff(e) in mikroverkapselter Form aufgebracht werden.Substrates according to claim 4, characterized in that the remission dye (s) are applied by direct coloring and the emission dye (s) are applied in microencapsulated form. Substrate nach Anspruch 1, dadurch gekennzeichnet, daß die Informationen durch Beschreiben oder Bedrucken angebracht werden.Substrates according to claim 1, characterized in that the information is applied by writing or printing. Substrate nach Anspruch 1, dadurch gekennzeichnet, daß die Farbmittel als Pigmente oder gefärbte Kunststoffpulver oder Polymerdispersionen aufgebracht werden.Substrates according to claim 1, characterized in that the colorants are applied as pigments or colored plastic powders or polymer dispersions. Substrate nach Anspruch 1, dadurch gekennzeichnet, daß die Absorptionsmaxima der Farbmittel einer Kombination nicht mehr als 30 nm auseinander liegen.Substrates according to claim 1, characterized in that the absorption maxima of the colorants of a combination are not more than 30 nm apart. Substrate nach Anspruch 8, dadurch gekennzeichnet, daß die Absorptionsmaxima nicht mehr als 20 nm auseinander liegen.Substrates according to claim 8, characterized in that the absorption maxima are not more than 20 nm apart.
EP93116545A 1992-10-26 1993-10-13 Substrate protected against unwanted copying and method of preparation of this substrate Expired - Lifetime EP0609493B1 (en)

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DE4236143 1992-10-26
DE4236143A DE4236143A1 (en) 1992-10-26 1992-10-26 Substrate with visible information protected against copying - prepd. with combination of adjacent fields of emitting and remitting colourants of almost same nuance when viewed without fluorescence

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EP0609493B1 EP0609493B1 (en) 1999-01-13

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DE59309304D1 (en) 1999-02-25
EP0609493B1 (en) 1999-01-13
DE4236143A1 (en) 1994-04-28
US5425978A (en) 1995-06-20

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