EP1028853B1 - Heat-sensitive recording sheet with a security element in the form of pressure-sensitive microcapsules - Google Patents

Heat-sensitive recording sheet with a security element in the form of pressure-sensitive microcapsules Download PDF

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Publication number
EP1028853B1
EP1028853B1 EP99944458A EP99944458A EP1028853B1 EP 1028853 B1 EP1028853 B1 EP 1028853B1 EP 99944458 A EP99944458 A EP 99944458A EP 99944458 A EP99944458 A EP 99944458A EP 1028853 B1 EP1028853 B1 EP 1028853B1
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EP
European Patent Office
Prior art keywords
heat
sensitive recording
sensitive
microcapsules
color
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Expired - Lifetime
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EP99944458A
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German (de)
French (fr)
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EP1028853A1 (en
Inventor
Erich Kranz
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Mitsubishi HiTech Paper Flensburg GmbH
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Mitsubishi HiTech Paper Flensburg GmbH
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Classifications

    • 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
    • B41M3/142—Security printing using chemical colour-formers or chemical reactions, e.g. leuco-dye/acid, photochromes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M5/00—Duplicating or marking methods; Sheet materials for use therein
    • B41M5/26—Thermography ; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used
    • B41M5/30—Thermography ; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used using chemical colour formers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M5/00—Duplicating or marking methods; Sheet materials for use therein
    • B41M5/124—Duplicating or marking methods; Sheet materials for use therein using pressure to make a masked colour visible, e.g. to make a coloured support visible, to create an opaque or transparent pattern, or to form colour by uniting colour-forming components
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M5/00—Duplicating or marking methods; Sheet materials for use therein
    • B41M5/124—Duplicating or marking methods; Sheet materials for use therein using pressure to make a masked colour visible, e.g. to make a coloured support visible, to create an opaque or transparent pattern, or to form colour by uniting colour-forming components
    • B41M5/165—Duplicating or marking methods; Sheet materials for use therein using pressure to make a masked colour visible, e.g. to make a coloured support visible, to create an opaque or transparent pattern, or to form colour by uniting colour-forming components characterised by the use of microcapsules; Special solvents for incorporating the ingredients

Definitions

  • the invention relates to a heat-sensitive recording sheet, the one Substrate, a heat sensitive applied to one side of the substrate Recording layer used to create a typeface under the influence contains heat-reactive color formers and color acceptors, and has a security element.
  • Heat-sensitive recording sheets have been known for a long time. Most of these materials are used to record remote copies, over public telephone networks - so-called fax procedure to be dispatched. An increasingly important area of application for heat-sensitive Recording materials have been in use lately as receipts, parking tickets from parking machines, entrance tickets and tickets as well Evidence of all kinds of games of chance.
  • Microcapsules have also been used in the manufacture of heat-sensitive recording sheet proposed.
  • the known suggestions mainly concern the improvement of shelf life and the Development of pressure and heat sensitive recording materials, which also enable heat-sensitive image transmission.
  • a heat-sensitive image transfer recording sheet which has a heat-sensitive recording layer on one side of its support and a heat and pressure-sensitive image transfer layer on the other side.
  • Microcapsules containing a colorless color former in a non-volatile solvent and microcapsules containing a color acceptor in a non-volatile solvent are arranged in the heat and pressure-sensitive image transfer layer.
  • Also in the image transfer layer is a solid, colorless, electron-donating color former and a solid, colorless, electron-accepting color developer and a wax.
  • the heat-sensitive image transfer recording sheet is placed on a simple sheet of paper and a thermal head is applied to the heat-sensitive recording layer, an image is formed on the heat-sensitive recording layer and the image of the recording is formed on the plain paper by heat transfer.
  • a thermal head is applied to the heat-sensitive recording layer
  • an image is formed on the heat-sensitive recording layer and the image of the recording is formed on the plain paper by heat transfer.
  • an image can also be formed on the simple paper sheet.
  • DE-37 04 627 A1 sees a heat-sensitive recording material in which the color reaction between a diazo compound and an associated coupling component takes place before that at least one of the two reaction components is contained in a microcapsule in order to improve the shelf life of the blank material and the sensitivity.
  • a 1 discloses a two-color recording material in which a heat-sensitive color-forming layer known per se and a light-sensitive, heat-sensitive color-forming layer which contains microcapsules in which a leuco dye and a photo-oxidizing agent are contained and a are applied successively to a support Reducing agent is present in the light-sensitive, heat-sensitive color formation layer.
  • the photosensitive, heat-sensitive recording layer is formed by heating with a heating block and subsequent irradiation with an ultra-high pressure mercury lamp.
  • JP 08 300 810 A discloses a heat-sensitive recording material which, in addition to the heat-sensitive coating applied to its front, provides a layer of color formers and acceptors applied to the front of its support, which attempts to make counterfeiting visible on the front of the heat-sensitive recording material. At least one of the reactants is encapsulated. The layer consisting of color formers and acceptors is covered with a polyolefin resin layer, not disclosed in any more detail, on which a transparent or translucent paper is arranged.
  • a disadvantage of this proposal in addition to the complicated structure of the recording material, is that the image created by the attempted forgery does not stand out clearly enough from the image produced by heat on the front side.
  • US-A-5,401,060 is a document paper which can be written on by means of a laser printer.
  • a locally limited application of a coating or printing ink composition is provided on the document, which has a color developer and a dye precursor contained in microcapsules.
  • the microcapsules break open under the influence of pressure and thus release the dye precursor contained therein, which under the influence of heat simultaneously acting on the document reacts with the color developer to form a color.
  • US-A-5,395,138 provides a coating color or printing ink composition in which the dye precursor contained in microcapsules reacts with the color developer under the capsule-destroying pressure without the additional influence of heat. Since the authenticity proof field charged with the coating color or printing ink composition is sensitive to pressure, the authenticity proof field and the normal use area to be labeled must be spatially separated in this known document paper.
  • EP-A-0 623 909 proposes a recording sheet with a plurality of coatings which are applied to different fields in a spatially limited manner and which are partially pressure-sensitive and partially heat-sensitive.
  • the known recording sheet is intended to enable typefaces of different colors by using combinations of different dye precursors and color acceptors in the different coating fields.
  • the multi-colored typefaces on the known recording sheet are intended to enable clear and more user-oriented use of forms or labels without the need for color printers.
  • the use of this known recording sheet as a heat-sensitive recording sheet with a security element is not disclosed.
  • the object of the present invention is to provide a heat sensitive Record sheet with a security element available too who are responsible for the production of tickets, tickets, receipts and can be used in gambling and the detection of fake ones Documents without using the recording sheet according to the invention are made without the use of mechanical or electrical Auxiliary devices such as UV lamps or those to be applied to the recording material Chemicals.
  • the invention provides a recording sheet in front of one substrate, one applied to one side of the substrate heat-sensitive recording layer which is used to produce a Typeface under the influence of heat reacting color formers and contains color acceptors, and has a security element
  • the Record sheet is characterized in that the security element in the heat-sensitive recording layer made of pressure-sensitive microcapsules consists of one or more color formers in a solvent contain the after destroying the microcapsules with the color acceptors Formation of a color react.
  • Coating base papers with a mass per unit area of 45 to 250 g / m 2, preferably 70 to 150 g / m 2, are suitable as substrates. Wood-free coating base papers or those with a low proportion of wood pulp are particularly suitable.
  • the substrates can also be provided with a primer with a mass per unit area of 3 to 12 g / m 2 .
  • the heat-sensitive recording layer is suitably applied with a mass per unit area in the range from 3 to 6 g / m 2 .
  • the mass per unit area of the finished heat-sensitive recording sheet is 48 to 268 g / m 2 , preferably 73 to 168 g / m 2 .
  • the heat-sensitive recording layer contains (otro-) Total weight 5 to 50 parts by weight of microcapsules with a particularly preferred Range between 12 and 30 parts by weight.
  • the microcapsules incorporated in the heat sensitive recording layer contain 1 to 8 parts by weight, preferably 2.5 to 6.5 parts by weight of color former based on the (otro-) total weight of the microcapsules.
  • microcapsules in the heat sensitive recording layer there is e.g. with an admission control the possibility an image in the heat-sensitive recording layer by the action of pressure to produce and in this way the authenticity of the paper used to control.
  • the microcapsules are e.g. one Destroyed metal stamp
  • the released color formers react with the acceptors the heat-sensitive recording layer and provide a stamp impression corresponding picture.
  • the color formers are preferably too choose between that generated by heat in the recording layer Image and the color former released in the recording layer resulting image there is a color contrast.
  • a pigmented primer of 4 g / m 2 is applied to a wood-free paper with a mass per unit area of 76 g / m 2 and dried.
  • the dried precoat is coated with a coating color to form a heat-sensitive recording layer which, in addition to the color formers and color acceptors required by means of heat to form an image, also contains microcapsules with a color former composition dissolved in solvent.
  • the application weight is otro 5 g / m 2 .
  • the weight ratio of temperature sensitive components and pressure sensitive components in the dried recording layer is 3.5: 1, which means that 22 parts by weight of microcapsules are contained in the heat sensitive recording layer.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Heat Sensitive Colour Forming Recording (AREA)
  • Color Printing (AREA)

Abstract

A heat-sensitive recording sheet having a substrate with a heat-sensitive recording layer which contains color formers and color acceptors which react with one another under the action of heat. In order to permit the detection of counterfeited documents without the additional use of aids such as UV lamps or chemicals, present in the heat-sensitive recording layer, as a security element, are pressure-sensitive microcapsules which contain one or more color formers in a solvent. The color formers react with the color acceptors, forming a color, after destruction of the microcapsules.

Description

Die Erfindung betrifft einen wärmeempfindlichen Aufzeichnungsbogen, der ein Substrat, eine auf einer Seite des Substrates aufgebrachte wärmeempfindliche Aufzeichnungsschicht, die zur Erzeugung eines Schriftbildes unter der Einwirkung von Hitze miteinander reagierende Farbbildner und Farbakzeptoren enthält, und ein Sicherheitselement aufweist.The invention relates to a heat-sensitive recording sheet, the one Substrate, a heat sensitive applied to one side of the substrate Recording layer used to create a typeface under the influence contains heat-reactive color formers and color acceptors, and has a security element.

Wärmeempfindliche Aufzeichnungsbogen sind seit längerer Zeit bekannt. Überwiegend werden diese Materialien zur Aufzeichnung von Fernkopien verwendet, die über öffentliche Fernsprechnetze - sogenanntes Telefaxverfahren versandt werden. Ein an Bedeutung zunehmendes Einsatzgebiet für wärmeempfindliche Aufzeichnungsmaterialien lag in letzter Zeit in der Verwendung als Kassenbons, Parkzettel von Parkautomaten, Eintritts - und Fahrkarten sowie Belegen bei Glücksspielen aller Art.Heat-sensitive recording sheets have been known for a long time. Most of these materials are used to record remote copies, over public telephone networks - so-called fax procedure to be dispatched. An increasingly important area of application for heat-sensitive Recording materials have been in use lately as receipts, parking tickets from parking machines, entrance tickets and tickets as well Evidence of all kinds of games of chance.

Zur Vermeidung bzw. Erkennung von Fälschungen wurden in der Vergangenheit bereits verschiedene Lösungen vorgeschlagen. Insbesondere wurde der Einsatz von unter ultravioletter Bestrahlung fluoreszierenden Fasern vorgeschlagen, die dem Papierfaserstoff vor der Blattbidung in geringer Menge zugemischt werden. Entsprechende Vorschläge finden sich für nicht dem Gebiet der wärmeempfindlichen Aufzeichnungsmaterialien zuzurechnende Papiere in der AT E 37053 B und gemäß der DE 19501289 A 1 für ein wärmeempfindliches Aufzeichnungspapier.Various solutions have already been proposed in the past to avoid or detect counterfeits. In particular, the use of fluorescent fibers under ultraviolet radiation has been proposed, which are admixed in a small amount with the paper pulp prior to sheet forming. Corresponding proposals can be found for papers not to be classified in the field of heat-sensitive recording materials in AT E 37053 B and according to DE 19501289 A1 for a heat-sensitive recording paper .

Mikrokapseln wurden auch bereits zur Verwendung bei der Herstellung von wärmeempfindlichen Aufzeichnungsbogen vorgeschlagen. Die bekannten Vorschläge betreffen vorwiegend die Verbesserung der Lagerbeständigkeit und die Entwicklung von gleichzeitig druck- und wärmeempfindlichen Aufzeichnungsmaterialien, die zudem noch eine wärmeempfindliche Bildübertragung ermöglichen.Microcapsules have also been used in the manufacture of heat-sensitive recording sheet proposed. The known suggestions mainly concern the improvement of shelf life and the Development of pressure and heat sensitive recording materials, which also enable heat-sensitive image transmission.

Aus der DE-35 04 730 C 2 ist ein wärmeempfindliches Bildübertragungs-Aufzeichnungsblatt bekannt, das auf der einen Seite seines Trägers eine wärmeempfindliche Aufzeichnungsschicht und auf der anderen Seite eine wärme- und druckempfindliche Bildübertragungsschicht aufweist. In der wärme- und druckempfindlichen Bildübertragungsschicht sind Mikrokapseln, die einen farblosen Farbbildner in einem nichtflüchtigen Lösungsmittel sowie Mikrokapseln, die einen Farbakzeptor in einem nichtflüchtigen Lösungsmittel enthalten, angeordnet. Ebenfalls in der Bildübertragungsschicht liegt ein fester, farbloser, Elektronen abgebender Farbbildner und ein fester, farbloser, Elektronen annehmender Farbentwickler sowie ein Wachs vor. Legt man das wärmeempfindliche Bildübertragungs-Aufzeichnungsblatt auf ein einfaches Blatt Papier und läßt auf die wärmeempfindliche Aufzeichnungsschicht einen Thermokopf einwirken, entsteht auf der wärmeempfindlichen Aufzeichnungsschicht eine Abbildung und auf dem einfachen Papier entsteht durch Wärmeübertragung das Abbild der Aufzeichnung. Durch Druck auf das wärmeempfindliche Bildübertragungs-Aufzeichnungsblatt läßt sich zusätzlich ein Abbild auf dem einfachen Papierblatt erzeugen.From DE-35 04 730 C 2 a heat-sensitive image transfer recording sheet is known which has a heat-sensitive recording layer on one side of its support and a heat and pressure-sensitive image transfer layer on the other side. Microcapsules containing a colorless color former in a non-volatile solvent and microcapsules containing a color acceptor in a non-volatile solvent are arranged in the heat and pressure-sensitive image transfer layer. Also in the image transfer layer is a solid, colorless, electron-donating color former and a solid, colorless, electron-accepting color developer and a wax. If the heat-sensitive image transfer recording sheet is placed on a simple sheet of paper and a thermal head is applied to the heat-sensitive recording layer, an image is formed on the heat-sensitive recording layer and the image of the recording is formed on the plain paper by heat transfer. By printing on the heat-sensitive image transfer recording sheet, an image can also be formed on the simple paper sheet.

Der Gedanke, bei einem wärmeempfindlichen und wärmeübertragbaren Aufzeichnungsblatt zusätzlich eine gewisse Druckempfindlichkeit einzustellen, wird in der DE-36 01 525 A 1 in der Weise aufgegriffen, daß nur ausgewählte Stellen in der wärmeübertragbaren Schicht druckempfindlich ausgebildet sind, indem diese Stellen Farbbildner und Farbentwickler enthalten, wobei wenigstens eine dieser Komponenten in Mikrokapseln enthalten ist. The idea of additionally setting a certain pressure sensitivity in a heat-sensitive and heat-transferable recording sheet is taken up in DE-36 01 525 A 1 in such a way that only selected locations in the heat-transferable layer are designed to be pressure-sensitive in that these locations contain color formers and color developers. wherein at least one of these components is contained in microcapsules.

Während bei den beiden vorstehend genannten Vorschlägen die Aufgabe in der Entwicklung eines wärmeempfindlichen, mit einer Bildübertragungsschicht versehenen und gleichzeitig druckempfindlichen Papiers besteht, sieht die DE-37 04 627 A 1 bei einem wärmeempfindlichen Aufzeichnungsmaterial, bei dem die Farbreaktion zwischen einer Diazoverbindung und einer zugehörigen Kupplungskomponente erfolgt, vor, daß mindestens eine der beiden Reaktionskomponenten in einer Mikrokapsel enthalten ist, um auf diese Weise die Lagerbeständigkeit des unbeschriebenen Materials und die Sensibilität zu verbessern.While in the two above-mentioned proposals the task is to develop a heat-sensitive paper provided with an image transfer layer and at the same time pressure-sensitive, DE-37 04 627 A1 sees a heat-sensitive recording material in which the color reaction between a diazo compound and an associated coupling component takes place before that at least one of the two reaction components is contained in a microcapsule in order to improve the shelf life of the blank material and the sensitivity.

Die DE-39 38 978 A 1 offenbart ein Zweifarben - Aufzeichnungsmaterial, bei dem nacheinander auf einen Träger eine an sich bekannte wärmeempfindliche Farbbildungsschicht und eine lichtempfindliche, wärmeempfindliche Farbbildungsschicht aufgebracht sind, die Mikrokapseln enthält, in denen ein Leukofarbstoff und ein Fotooxidationsmittel enthalten sind und ein Reduktionsmittel in der lichtempfindlichen, wärmeempfindlichen Farbbildungsschicht vorliegt. Die Bilderzeugung der lichtempfindlichen, wärmeempfindlichen Aufzeichnungsschicht erfolgt durch Erhitzen mit einem Heizblock und anschließende Bestrahlung mit einer Ultrahochdruck-Quecksilberlampe. DE-39 38 978 A 1 discloses a two-color recording material in which a heat-sensitive color-forming layer known per se and a light-sensitive, heat-sensitive color-forming layer which contains microcapsules in which a leuco dye and a photo-oxidizing agent are contained and a are applied successively to a support Reducing agent is present in the light-sensitive, heat-sensitive color formation layer. The photosensitive, heat-sensitive recording layer is formed by heating with a heating block and subsequent irradiation with an ultra-high pressure mercury lamp.

Die JP 08 300 810 A offenbart ein wärmeempfindliches Aufzeichnungsmaterial, das außer der auf seiner Frontseite angebrachten wärmeempfindlichen Beschichtung eine auf der Vorderseite seines Trägers angebrachte Schicht aus Farbbildnern und Akzeptoren vorsieht, welche Fälschungsversuche auf der Frontseite des wärmeempfindlichen Aufzeichnungsmaterials sichtbar machen sollen. Mindestens einer der Reaktionspartner ist eingekapselt. Die aus Farbbildnern und Akzeptoren bestehende Schicht ist mit einer nicht näher offenbarten Polyolefinharzschicht abgedeckt, auf der ein transparentes oder lichtdurchlässiges Papier angeordnet ist. Nachteilig bei diesem Vorschlag ist neben dem komplizierten Aufbau des Aufzeichnungsmaterials, daß sich das durch die versuchte Fälschung entstehende Bild nicht deutlich genug von dem auf der Frontseite durch Wärme erzeugten Bild abhebt. JP 08 300 810 A discloses a heat-sensitive recording material which, in addition to the heat-sensitive coating applied to its front, provides a layer of color formers and acceptors applied to the front of its support, which attempts to make counterfeiting visible on the front of the heat-sensitive recording material. At least one of the reactants is encapsulated. The layer consisting of color formers and acceptors is covered with a polyolefin resin layer, not disclosed in any more detail, on which a transparent or translucent paper is arranged. A disadvantage of this proposal, in addition to the complicated structure of the recording material, is that the image created by the attempted forgery does not stand out clearly enough from the image produced by heat on the front side.

Gegenstand der US-A-5,401,060 ist ein mittels Laserdrucker beschreibbares Dokumentenpapier. Zum Zweck seines Authentizitätsnachweises ist auf dem Dokument ein lokal begrenzter Auftrag einer Streichfarben- oder Druckfarbenkomposition vorgesehen, die einen Farbentwickler und einen in Mikrokapseln enthaltenen Farbstoffvortäufer aufweist. Unter dem Einfluß von Druck brechen die Mikrokapseln auf und setzen so den in ihnen enthaltenen Farbstoffvorläufer frei, der unter dem Einfluß gleichzeitig auf das Dokument einwirkender Hitze mit dem Farbentwickler unter Ausbildung einer Farbe reagiert. Als Variante dieses bekannten Dokumentenpapiers sieht die US-A-5,395,138 eine Streichfarben- oder Druckfarbenkomposition vor, bei der der in Mikrokapseln enthaltene Farbstoffvorläufer unter die Kapseln zerstörendem Druck ohne den zusätzlichen Einfluß von Wärme mit dem Farbentwickler reagiert. Da das mit der Streichfarben- oder Druckfarbenkomposition beaufschlagte Authentizitätsnachweisfeld druckempfindlich ist, müssen bei diesem bekannten Dokumentenpapier das Authentizitätsnachweisfeld und der normal zu beschriftende Nutzungsbereich räumlich getrennt sein.The subject of US-A-5,401,060 is a document paper which can be written on by means of a laser printer. For the purpose of proving its authenticity, a locally limited application of a coating or printing ink composition is provided on the document, which has a color developer and a dye precursor contained in microcapsules. The microcapsules break open under the influence of pressure and thus release the dye precursor contained therein, which under the influence of heat simultaneously acting on the document reacts with the color developer to form a color. As a variant of this known document paper, US-A-5,395,138 provides a coating color or printing ink composition in which the dye precursor contained in microcapsules reacts with the color developer under the capsule-destroying pressure without the additional influence of heat. Since the authenticity proof field charged with the coating color or printing ink composition is sensitive to pressure, the authenticity proof field and the normal use area to be labeled must be spatially separated in this known document paper.

Einen Aufzeichnungsbogen mit mehreren Beschichtungen, die räumlich begrenzt auf sich unterscheidenden Feldern aufgetragen und teilweise druckempfindlich und teilweise wärmeempfindlich ausgebildet sind, schlägt die EP-A-0 623 909 vor. Der bekannte Aufzeichnungsbogen soll verschiedenfarbige Schriftbilder durch die Verwendung von Kombinationen verschiedener Farbstoffvorläufer und Farbakzeptoren in den unterschiedlichen Beschichtungsfeldem ermöglichen. Die vielfarbigen Schriftbilder auf dem bekannten Aufzeichnungsbogen sollen übersichtliche und eine nutzungsorientiertere Verwendung von Formblättern oder Labels ermöglichen, ohne daß Farbdrucker benutzt werden müssen. Die Verwendung dieses bekannten Aufzeichnungsbogens als wärmeempfindlicher Aufzeichnungsbogen mit Sicherheitselement wird nicht offenbart. EP-A-0 623 909 proposes a recording sheet with a plurality of coatings which are applied to different fields in a spatially limited manner and which are partially pressure-sensitive and partially heat-sensitive. The known recording sheet is intended to enable typefaces of different colors by using combinations of different dye precursors and color acceptors in the different coating fields. The multi-colored typefaces on the known recording sheet are intended to enable clear and more user-oriented use of forms or labels without the need for color printers. The use of this known recording sheet as a heat-sensitive recording sheet with a security element is not disclosed.

Die Aufgabe der vorliegenden Erfindung besteht darin, einen wärmeempfindlichen Aufzeichnungsbogen mit einem Sicherheitselement zur Verfügung zu stellen, der zur Herstellung von Eintrittskarten, Fahrausweisen, Quittungen und bei Glücksspielen verwendet werden kann und der das Erkennen von gefälschten Dokumenten, die ohne Verwendung des erfindungsgemäßen Aufzeichnungsbogens hergestellt sind, ohne den Einsatz maschineller oder elektrischer Hilfsgeräte wie UV-Lampen oder von auf das Aufzeichnungsmaterial aufzubringenden Chemikalien ermöglicht.The object of the present invention is to provide a heat sensitive Record sheet with a security element available too who are responsible for the production of tickets, tickets, receipts and can be used in gambling and the detection of fake ones Documents without using the recording sheet according to the invention are made without the use of mechanical or electrical Auxiliary devices such as UV lamps or those to be applied to the recording material Chemicals.

Zur Lösung der vorstehenden Aufgabe sieht die-Erfindung einen Aufzeichnungsbogen vor, der ein Substrat, eine auf einer Seite des Substrates aufgebrachte wärmeempfindliche Aufzeichnungsschicht, die zur Erzeugung eines Schriftbildes unter der Einwirkung von Hitze miteinander reagierende Farbbildner und Farbakzeptoren enthält, und ein Sicherheitselement aufweist, wobei der Aufzeichnungsbogen dadurch gekennzeichnet ist, daß das Sicherheitselement in der wärmeempfindlichen Aufzeichnungsschicht aus druckempfindlichen Mikrokapseln besteht, die in einem Lösungsmittel einen oder mehrere Farbbildner enthalten, die nach Zerstörung der Mikrokapseln mit den Farbakzeptoren unter Bildung einer Farbe reagieren.To achieve the above object, the invention provides a recording sheet in front of one substrate, one applied to one side of the substrate heat-sensitive recording layer which is used to produce a Typeface under the influence of heat reacting color formers and contains color acceptors, and has a security element, the Record sheet is characterized in that the security element in the heat-sensitive recording layer made of pressure-sensitive microcapsules consists of one or more color formers in a solvent contain the after destroying the microcapsules with the color acceptors Formation of a color react.

Als geeignete Substrate kommen Streichrohpapiere mit einer flächenbezogenen Masse von 45 bis 250 g/m2 vorzugsweise von 70 bis 150 g/m2 in Betracht. Insbesondere sind holzfreie Streichrohpapiere oder solche mit einem geringen Anteil an Holzstoff geeignet. Vor Auftrag der wärmeempfindlichen Aufzeichnungsschicht können die Substrate noch mit einem Vorstrich mit einer flächenbezogenen Masse von 3 bis 12 g/m2 versehen werden. Die wärmeempfindliche Aufzeichnungsschicht wird geeigneterweise mit einer flächenbezogenen Masse im Bereich von 3 bis 6 g/m2 aufgetragen. Die flächenbezogene Masse des fertiggestellten wärmeempfindlichen Aufzeichnungsbogens beträgt 48 bis 268 g/m2, vorzugsweise 73 bis 168 g/m2.Coating base papers with a mass per unit area of 45 to 250 g / m 2, preferably 70 to 150 g / m 2, are suitable as substrates. Wood-free coating base papers or those with a low proportion of wood pulp are particularly suitable. Before the heat-sensitive recording layer is applied, the substrates can also be provided with a primer with a mass per unit area of 3 to 12 g / m 2 . The heat-sensitive recording layer is suitably applied with a mass per unit area in the range from 3 to 6 g / m 2 . The mass per unit area of the finished heat-sensitive recording sheet is 48 to 268 g / m 2 , preferably 73 to 168 g / m 2 .

Die wärmeempfindliche Aufzeichnungsschicht enthält bezüglich ihres (otro-) Gesamtgewichts 5 bis 50 Gew.-Teile Mikrokapseln mit einem besonders bevorzugten Bereich zwischen 12 und 30 Gew.-Teilen.The heat-sensitive recording layer contains (otro-) Total weight 5 to 50 parts by weight of microcapsules with a particularly preferred Range between 12 and 30 parts by weight.

Die in die wärmeempfindliche Aufzeichnungsschicht eingearbeiteten Mikrokapseln enthalten 1 bis 8 Gew.-Teile, vorzugsweise 2,5 bis 6,5 Gew.-Teile Farbbildner bezogen auf das (otro-) Gesamtgewicht der Mikrokapseln.The microcapsules incorporated in the heat sensitive recording layer contain 1 to 8 parts by weight, preferably 2.5 to 6.5 parts by weight of color former based on the (otro-) total weight of the microcapsules.

Durch die Maßnahme, Mikrokapseln in die wärmeempfindliche Aufzeichnungsschicht einzubringen, besteht z.B. bei einer Einlaßkontrolle die Möglichkeit, durch Druckeinwirkung ein Bild in der wärmeempfindlichen Aufzeichnungsschicht zu erzeugen und auf diese Weise die Echtheit des verwendeten Papiers zu kontrollieren. Werden die Mikrokapseln durch Druckeinwirkung z.B. eines Metallstempels zerstört, reagieren die freigesetzten Farbbildner mit den Akzeptoren der wärmeempfindlichen Aufzeichnungsschicht und liefern ein dem Stempelabdruck entsprechendes Bild. Die Farbbildner sind vorzugsweise so zu wählen, daß zwischen dem durch Wärme in der Aufzeichnungsschicht erzeugten Bild und dem durch die freigesetzten Farbbildner in der Aufzeichnungsschicht entstehenden Bild ein farblicher Kontrast besteht.By the measure, microcapsules in the heat sensitive recording layer there is e.g. with an admission control the possibility an image in the heat-sensitive recording layer by the action of pressure to produce and in this way the authenticity of the paper used to control. If the microcapsules are e.g. one Destroyed metal stamp, the released color formers react with the acceptors the heat-sensitive recording layer and provide a stamp impression corresponding picture. The color formers are preferably too choose between that generated by heat in the recording layer Image and the color former released in the recording layer resulting image there is a color contrast.

Der in Beschreibung, Beispiel und Ansprüchen verwendete Begriff "otro" bedeuted ofentrocken. The term "otro" used in the description, example and claims means oven dry.

Das nachfolgende Beispiel erläutert die Erfindung:The following example explains the invention:

Auf ein holzfreies Papier mit einer flächenbezogenen Masse von 76 g/m2 wird ein pigmentierter Vorstrich von 4 g/m2 aufgetragen und getrocknet. Der getrocknete Vorstrich wird mit einer Streichfarbe zur Ausbildung einer wärmeempfindlichen Aufzeichnungsschicht überzogen, die neben den mittels Wärme zur Erzeugung eines Bildes erforderlichen Farbbildnem und Farbakzeptoren noch Mikrokapseln mit einer darin in Lösungsmittel gelösten Farbbildnerzusammensetzung enthält. Das Auftragsgewicht beträgt otro 5 g/m2. Das Gewichtsverhältnis von temperaturempfindlichen Komponenten und druckempfindlichen Komponenten in der getrockneten Aufzeichnungsschicht beträgt 3,5 : 1, was bedeutet, daß in der wärmeempfindlichen Aufzeichnungsschicht 22 Gew.-Teile Mikrokapseln enthalten sind. Durch Druckeinwirkung eines Metallstempels entsteht auf der Vorderseite ein Stempelabdruck, der die Echtheit des eingesetzen Papiers dokumentiert.A pigmented primer of 4 g / m 2 is applied to a wood-free paper with a mass per unit area of 76 g / m 2 and dried. The dried precoat is coated with a coating color to form a heat-sensitive recording layer which, in addition to the color formers and color acceptors required by means of heat to form an image, also contains microcapsules with a color former composition dissolved in solvent. The application weight is otro 5 g / m 2 . The weight ratio of temperature sensitive components and pressure sensitive components in the dried recording layer is 3.5: 1, which means that 22 parts by weight of microcapsules are contained in the heat sensitive recording layer. The effect of a metal stamp creates a stamp on the front that documents the authenticity of the paper used.

Claims (6)

  1. Heat-sensitive recording sheet having:
    a substrate,
    a heat-sensitive recording layer which is applied to one side of the substrate and which comprises colour formers and colour acceptors that react with one another under the action of heat to produce a written image and
    a security element,
    characterised in that the security element consists of pressure-sensitive microcapsules present in the heat-sensitive recording layer, which microcapsules comprise, in a solvent, one or more colour formers which, after the microcapsules have been broken, react with the colour acceptors to form a colour.
  2. Heat-sensitive recording sheet according to claim 1, characterised in that the heat-sensitive recording layer comprises, based on its (o-dry) total weight, from 5 to 50 parts by weight of microcapsules.
  3. Heat-sensitive recording sheet according to either claim 1 or claim 2, characterised in that the heat-sensitive recording layer comprises; based on its (o-dry) total weight, from 12 to 30 parts by weight of microcapsules .
  4. Heat-sensitive recording sheet according to any one of claims 1 to 3, characterised in that the microcapsules contain, based on their (o-dry) total weight, from 1 to 8 parts by weight of colour former(s).
  5. Heat-sensitive recording sheet according to any one of claims 1 to 4, characterised in that the microcapsules contain, based on their (o-dry) total weight, from 2.5 to 6.5 parts by weight of colour former(s).
  6. Heat-sensitive recording sheet according to any one of claims 1 to 5, characterised in that the mass per unit area of the heat-sensitive recording sheet is from 48 to 268 g/m2.
EP99944458A 1998-08-27 1999-08-20 Heat-sensitive recording sheet with a security element in the form of pressure-sensitive microcapsules Expired - Lifetime EP1028853B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19838893 1998-08-27
DE19838893A DE19838893C2 (en) 1998-08-27 1998-08-27 Heat sensitive recording sheet
PCT/EP1999/006122 WO2000012321A1 (en) 1998-08-27 1999-08-20 Heat-sensitive recording sheet with a security element in the form of pressure-sensitive microcapsules

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EP1028853A1 EP1028853A1 (en) 2000-08-23
EP1028853B1 true EP1028853B1 (en) 2001-11-21

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US (1) US6440898B1 (en)
EP (1) EP1028853B1 (en)
JP (1) JP2002523268A (en)
AT (1) ATE209109T1 (en)
DE (2) DE19838893C2 (en)
ES (1) ES2165240T3 (en)
WO (1) WO2000012321A1 (en)

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DE10113286A1 (en) 2001-03-16 2002-10-02 Mitsubishi Hitec Paper Flensbu Heat sensitive recording sheet and its use
FR2827618B1 (en) * 2001-07-18 2003-10-03 Banque De France DOCUMENT SECURING PROCESS
FR2876714B1 (en) * 2004-10-20 2008-05-02 Francois Charles Oberthur Fidu SECURING METHOD OF VALUE DOCUMENTS
DE102008005136A1 (en) * 2008-01-16 2009-07-23 U-Nica Technology Ag Document and method for producing a document
DE102013218754B4 (en) * 2013-09-18 2019-05-09 Bundesdruckerei Gmbh Tamper-proofed value or security product and method for verifying the authenticity of the tamper-resistant security or value-added product

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AT37053B (en) 1908-04-24 1909-04-26 Ignatz Dr Palocz Inhalation device.
JPS60168690A (en) * 1984-02-13 1985-09-02 Mitsubishi Paper Mills Ltd Pressure-sensitive colorless thermal transfer recording paper
FR2566440B1 (en) * 1984-06-22 1988-07-22 Jalon Michel SECURITY FIBERS AND OTHER MATERIALS MADE LUMINESCENT BY A DYEING PROCESS, THEIR PROCESSES AND THEIR APPLICATIONS
DE3601525A1 (en) 1985-01-21 1986-07-24 Mitsubishi Paper Mills, Ltd., Tokio/Tokyo HEAT SENSITIVE AND HEAT TRANSFERABLE RECORD SHEET
JPS62187080A (en) 1986-02-13 1987-08-15 Fuji Photo Film Co Ltd Thermal recording material
JPH0832484B2 (en) 1988-11-25 1996-03-29 富士写真フイルム株式会社 Multicolor recording material
US5984363A (en) * 1993-05-03 1999-11-16 The Standard Register Company Business record having a thermally imagable surface
US5401060A (en) 1993-06-14 1995-03-28 Wallace Computer Services, Inc. Document with heat and pressure sensitive chromogentic composition thereon
US5395138A (en) * 1993-06-14 1995-03-07 Wallace Computer Services, Inc. Security document verification system with pressure-rupturable microcapsules
DE19501289A1 (en) * 1995-01-18 1996-07-25 Feldmuehle Ag Stora Heat sensitive paper for thermal printing
JP3614931B2 (en) * 1995-05-10 2005-01-26 三菱製紙株式会社 Recording sheet and forgery detection method

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ATE209109T1 (en) 2001-12-15
DE59900676D1 (en) 2002-02-21
US6440898B1 (en) 2002-08-27
DE19838893A1 (en) 2000-03-09
ES2165240T3 (en) 2002-03-01
EP1028853A1 (en) 2000-08-23
WO2000012321A1 (en) 2000-03-09
JP2002523268A (en) 2002-07-30
DE19838893C2 (en) 2000-09-28

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