EP2636532A1 - Method for producing a recording material with authentication characteristic - Google Patents

Abstract

Producing a single authentication feature exhibiting recording material with a sheet substrate dyed in mass and a pigmentation covering entire surface of at least one side of the substrate, comprises e.g. (a) producing a sheet substrate intensely dyed in the mass, having a front side and a rear side, (c) applying the first coating composition at the front side of the sheet substrate to form an uncolored pigmentation, (d) drying the first coating composition, (e) applying the second coating composition at the rear side of the sheet substrate, to form an uncolored pigmentation, and (f) drying. Producing a single security feature exhibiting recording material with a sheet substrate dyed in the mass and a pigmentation covering entire surface of at least one side of the substrate, comprises (a) producing a sheet substrate intensely dyed in the mass, having a front side as the first of the two sides of the substrate and a rear side as the second of the two sides of the substrate, (b) preparing a first- and a second coating composition comprising at least one pigment and a binder, (c) applying the first coating composition using a first coating unit at the front side of the sheet substrate moving with respect to the first coating unit during applying, to form an uncolored pigmentation covering the entire surface on the front side of the substrate, such that the uncolored pigmentation of the first coating composition has an opacity of 80-100%, (d) drying the first coating composition, (e) applying the second coating composition using a second coating unit at the rear side of the sheet substrate moving with respect to the second coating unit during applying, to form an uncolored pigmentation covering the entire surface on the rear side of the substrate, such that the uncolored pigmentation of the second coating composition has an opacity of 80-100%, and (f) drying the second coating composition.

Description

The invention relates to a method for producing a recording material having an authentication feature with a mass-dyed web-shaped substrate and a pigment coating covering the substrate over at least one side over the entire surface.

Proof of authenticity for documents in the form of passive examinations, for example, is made possible by watermarks. A watermark is generally understood to mean a drawing in the paper, which is caused by different paper thickness. A distinction is made between genuine watermarks which are produced by displacement (so-called light watermarks) or by enrichment (so-called shadow watermarks) of the fiber mass, for example using a dandy cutter in the wire section of a paper machine Embossing of the still wet paper in the press section of a paper machine are generated, and finally spurious watermarks, the latter being created either by printing the finished paper outside the paper machine with a colorless paint or by embossing the finished paper outside the paper machine.

Suggestions for spurious watermarks can be found in the EP 0 203 499 B1 , which provides a paper web, which is deformable by the addition of suitable substances by means of heat optionally also with the simultaneous application of pressure, and in the DE 39 20 378 A1 according to which the arrangement of a watermark outside the paper machine is disclosed by printing a varnish. The disadvantages of these proposals are that their realization is limited by the use of the necessary costly raw materials to special areas.

A proposal of DE 690 01 677 T2 According to a synthetic print carrier with pseudo watermark is provided. This known print carrier comprises a plastic substrate, at least one, preferably by means of gravure applied, the opacity of the print carrier changing authentication or security mark and at least one character covering printable pigment coating. The monochrome or polychrome character should hardly be visible in reflected light, but should be clearly visible in transmitted light. Also for this known print carrier is the fundamental disadvantage that the printed pseudo watermark can be forged relatively easily, which can not be prevented even by simple pigment coatings applied thereto.

The use of watermarks as an authentication feature is very widespread in the papermaking industry and extremely popular with customers, as a watermark suggests not only the expected authenticity, but also a salient value of the paper equipped with it. In fact, it is quite possible to imitate a watermark by the subsequent application of a colorless paint - very similar to the spurious watermark - such a paint job causes differences in brightness in the paper review, as well as a watermark.

• noch zu marktvertretbaren Preisen hergestellt und somit angeboten werden kann,
• möglichst weit in den Produktionsprozess eingebunden ist, um eine anschließende Nachbildung in Fälschungsabsicht weitestgehend auszuschließen,
• am fertigen Aufzeichnungsmaterial nicht sofort erkennbar ist, um einen gewissen Überraschungseffekt für mögliche Fälscher aufzubauen.

Based on the state of the art to be appreciated in this way, the task of the inventors was to propose an alternative authentication feature for a recording material which

• can still be produced and thus offered at marketable prices,
• as far as possible integrated into the production process, in order to exclude as far as possible subsequent imitation in counterfeiting
• on the finished recording material is not immediately recognizable to build a certain surprise effect for potential counterfeiters.

• ■ Ausbilden eines in der Masse farbintensiv durchgefärbten bahnförmigen Substrats, aufweisend eine Vorderseite als die erste der beiden Substratseiten und eine Rückseite als die zweite der beiden Substratseiten;
• ■ Vorbereiten einer ersten Beschichtungszusammensetzung, wobei diese erste Beschichtungszusammensetzung mindestens aufweist:
  • ein Pigment,
  • ein Bindemittel;
• ■ Vorbereiten einer zweiten Beschichtungszusammensetzung, wobei diese zweite Beschichtungszusammensetzung mindestens aufweist:
  • ein Pigment,
  • ein Bindemittel;
• ■ Zuführen der vorbereiteten ersten Beschichtungszusammensetzung zu einem ersten Streichaggregat und Auftragen der ersten Beschichtungszusammensetzung mit dem ersten Streichaggregat auf die Vorderseite des während der Auftragung relativ zum ersten Streichaggregat bewegten bahnförmigen Substrats zur Ausbildung eines das Substrat auf seiner Vorderseite vollflächig abdeckenden unbunten Pigmentauftrags, derart,
• ■ dass der unbunte Pigmentauftrag aus der ersten Beschichtungszusammensetzung eine Opazität aufweist in einem Bereich von 80% bis 100%;
• ■ Trocknen der ersten Beschichtungszusammensetzung;
• ■ Zuführen der vorbereiteten zweiten Beschichtungszusammensetzung zu einem zweiten Streichaggregat und Auftragen der zweiten Beschichtungszusammensetzung mit dem zweiten Streichaggregat auf die Rückseite des während der Auftragung relativ zum zweiten Streichaggregat bewegten bahnförmigen Substrats zur Ausbildung des das Substrat auf seiner Rückseite vollflächig abdeckenden Pigmentauftrags, derart, dass der Pigmentauftrag aus der zweiten Beschichtungszusammensetzung eine Opazität aufweist in einem Bereich von 80% bis 100%;
• ■ Trocknen der zweiten Beschichtungszusammensetzung.

After various attempts in the direction of other solutions, the inventors finally recognized that the problem can be solved outstandingly well by means of a method for producing a recording material having an authentification feature with a mass-colored substrate in the form of a web and at least on one side covering the substrate pigment application, wherein the method proposed on this side is characterized in that the method has at least the following method steps:

• Forming a color-intensely through-dyed web-like substrate having a front side as the first of the two substrate sides and a back side as the second of the two substrate sides;
• Preparing a first coating composition, said first coating composition comprising at least
  • a pigment,
  • a binder;
• Prepare a second coating composition, said second coating composition comprising at least
  • a pigment,
  • a binder;
• Supplying the prepared first coating composition to a first coating unit and applying the first coating composition with the first coating unit to the front side of the web-shaped substrate moved during application relative to the first coating unit to form an achromatic pigment application over the entire area covering the substrate on its front side,
• ■ that the achromatic pigment application from the first coating composition has an opacity in a range of 80% to 100%;
• Drying the first coating composition;
• Feeding the prepared second coating composition to a second coating unit and applying the second coating composition with the second coating unit to the back side of the sheet-like substrate moving during application relative to the second coating unit to form the pigment application covering the substrate on its reverse side, such that the pigment application from the second coating composition has an opacity in a range of 80% to 100%;
• ■ drying the second coating composition.

The first method step provides for the formation of a web-shaped substrate that is color-intensely colored in the mass, wherein the substrate has a front side as the first of the two substrate sides and a back side as the second of the two substrate sides. As a substrate, on the one hand offers a film, ideally a tearable film on. However, paper according to the invention is preferred as the substrate. The formation of the web-like substrate then takes place, for example, on a paper machine in which a paper pulp of different pulps, optionally mechanical pulp, fillers and water is applied in at least one upstream mixing chest and where to This paper pulp before being fed to the paper machine preferably further ingredients such as resin glue are added to the engine sizing.

In a decisive manner, the web-shaped substrate is dyed through in a color intensive manner, which occurs in the case of paper as a substrate, in particular, by adding dyes and / or color pigments in a relatively large amount into the paper pulp before it is fed to the paper machine. In particular, black, green, blue and very particularly preferably red are used as the color for the through-colored substrate, the coloration in each case being chosen vigorously and intensively.

• Aluminiumdioxid,
• Siliziumdioxid,
• Kalziumkarbonat,
• Kaolin,
• Titandioxid,
• Bariumsulfat,
• Zinkoxid,
• Zinksulfit.

In preparing the first coating composition, at least one pigment and at least one binder are combined to form a spreadable composition. In this case, the first coating composition comprises at least one inorganic pigment selected from the list, comprising:

• alumina,
• silica,
• Calcium carbonate,
• Kaolin,
• titanium dioxide,
• barium sulfate,
• Zinc oxide,
• Sulfite.

Pigment mixtures of various inorganic pigments are also possible, of which then preferably at least one inorganic pigment is selected, very particularly preferably two inorganic pigments are selected from the above list. A particular preference in each case is titanium dioxide. From numerous test series on which this invention is based, it was further recognized that a combination of on the one hand at least one inorganic pigment, unconditionally preferably selected from the above list and very particularly preferably from titanium dioxide, and secondly from an organic pigment, is particularly advantageous in the sense of the present invention Invention.

In the case of a combination of inorganic pigment, preferably of titanium dioxide, and of organic pigment, one applies to% by weight in the respective coating composition ratio of inorganic pigment: organic pigment in a range of
3: 1 to 2: 1
as very particularly preferred. In the case of a combination of titanium dioxide with a second inorganic pigment, more preferably selected from the list, comprising kaolin and calcium carbonate, a titanium dioxide: second inorganic pigment ratio based on% by weight in the respective coating composition is in the range of
2: 1 to 3: 5
as very particularly preferred.

The prepared first coating composition is supplied after completion of a first coating unit and applied with this on the front of moving during the application relative to the first coating unit web-like substrate to form a substrate covering the entire surface on his front achromatic pigment application. The pigment coating is therefore white and thus has a large difference in color to the color intensive through-dyed web-like substrate. By ensuring an opacity of this pigment application in a range of 80% to 100%, a through-shining of the web-shaped substrate is largely precluded by the preferred single-layer pigment coating on the front side, wherein in particular color-intensive substrate dyeing opacity of the pigment on the front side of the substrate in the Restricted range of 85% to 100% and still further limited from 90% to 100% is considered to be very particularly preferred. In the context of the experiments on which this invention is based, it has been found that in particular when applying a first coating composition comprising a combination of at least one inorganic pigment, preferably selected from the above list and very particularly preferably titanium dioxide, and on the other hand either a second inorganic pigment selected from the above list, or from an organic pigment, the preferred opacity values are obtained with values for the basis weight of the front-trained pigment application in a range of 25 g / m ² to 42 g / m ² and most preferably still further limited in a range of 30 g / m ² to 42 g / m ² .

• Aluminiumdioxid,
• Siliziumdioxid,
• Kalziumkarbonat,
• Kaolin,
• Titandioxid,
• Bariumsulfat,
• Zinkoxid,
• Zinksulfit.

Auch Pigmentmischungen aus verschiedenen anorganischen Pigmenten sind möglich, von denen dann bevorzugt mindestens ein anorganisches Pigment ausgesucht ist aus obiger Liste. Eine besondere Präferenz liegt dabei in jedem Fall auf Titandioxid. Aus zahlreichen Versuchsreihen, die dieser Erfindung zugrunde liegen, wurde ferner erkannt, dass eine Kombination einerseits aus mindestens einem anorganischen Pigment, bevorzugt ausgesucht aus obiger Liste und ganz besonders bevorzugt aus Titandioxid, und andererseits entweder aus einem zweiten anorganischen Pigment, ausgesucht aus obiger Liste, oder aus einem organischen Pigment besonders vorteilhaft ist im Sinne der vorliegenden Erfindung.Also in the preparation of the second coating composition, at least one pigment and at least one binder are combined to form a spreadable composition. Again, the coating composition comprises at least one inorganic pigment selected from the list, comprising:

• alumina,
• silica,
• Calcium carbonate,
• Kaolin,
• titanium dioxide,
• barium sulfate,
• Zinc oxide,
• Sulfite.

Pigment mixtures of various inorganic pigments are also possible, of which then preferably at least one inorganic pigment is selected from the list above. A particular preference in each case is titanium dioxide. From numerous test series on which this invention is based, it was further recognized that a combination of at least one inorganic pigment, preferably selected from the above list and most preferably from titanium dioxide, and on the other hand either from a second inorganic pigment, selected from the above list, or from an organic pigment is particularly advantageous in the context of the present invention.

The prepared second coating composition is supplied after completion of a second coating unit and applied with this on the back of moving during the application relative to the second coating unit web-like substrate to form the substrate on its back covering the entire surface pigment application. The pigment coating on the back side of the substrate is preferably light, most preferably achromatic and thus also white, like the application of pigment on the front side of the substrate. Irrespective of whether it is light or uncoloured, the pigment coating on the back of the substrate definitely has a large difference in color to the color-intensely colored substrate substrate. By ensuring an opacity of this pigment application in a range of 80% to 100%, a through-shining of the web-shaped substrate by the preferably single-layer pigment application on the reverse side of which is largely excluded, with opacity of the pigment coating on the back side of the substrate in the restricted range of 85% to 100% and even more limited from 90% to 100% being considered to be very particularly preferred in the case of particularly color intensive substrate dyeing. In the context of the experiments on which this invention is based, it has additionally been found that in particular when applying a second coating composition comprising a combination of at least one inorganic pigment, preferably selected from the list above and very particularly preferably from titanium dioxide, and secondarily either from a second coating composition inorganic pigment, selected from the list above, or from an organic pigment, the preferred opacity values are achieved with values for the basis weight of the back-trained pigment application in a range of 25 g / m ² to 42 g / m ^2, and most preferably still further limited in a range of 30 g / m ² to 42 g / m ² .

In summary of the disclosures in the previous paragraphs [0007] to [0014] it can be seen that the color-intensive through-colored web-shaped substrate has front and rear pigment applications, each having a large color difference from the substrate itself and the color of the web-shaped substrate is not affected by the Pigment orders shimmer through. The user of such a recording material initially receives no indication of the colored formation of the centrally arranged substrate. Only when tearing the recording material and / or by tearing off a flat portion of the recording material, the recording material according to the invention its authentication feature at fraying edge along the tear line price, because there break the pigment orders along random tear lines, which are also different from the also random tear lines of the web-like substrate , Subsequent imitation of the thus provided with an authentication feature recording material is practically not possible, since the introduction of the inventive authentication feature in the form of color intensely colored substrate in the midst of the production of the recording material proposed here happens and can not be inserted in the fake intention to production downstream activities.

The choice of the particular binder on the one hand in the first and on the other in the second coating composition is not particularly limited - the usual binders for the preparation of pigmented coating composition can be used such as water-soluble binders, in particular Starch, hydroxyethylcellulose, methylcellulose, carboxymethylcellulose, gelatin, casein, polyvinyl alcohols, modified polyvinyl alcohols, ethylene-vinyl alcohol copolymers, sodium polyacrylates, acrylamide-acrylate copolymers, acrylamide-acrylate-methacrylate terpolymers and alkali metal salts of styrene-maleic anhydride copolymer or ethylene-maleic anhydride Copolymer can be counted, wherein the binders can be used alone or in combination with each other; Water-insoluble latex binders such as styrene-butadiene copolymers, acrylonitrile-butadiene copolymers and methyl acrylate-butadiene copolymers are also suitable as binders for incorporation into the first and likewise into the second coating composition.

• das erste Streichaggregat zur Aufbringung der ersten Beschichtungszusammensetzung auf die Vorderseite des bahnförmigen Substrates
  und
• das zweite Streichaggregat zur Aufbringung der zweiten Beschichtungszusammensetzung auf die Rückseite des bahnförmigen Substrates
  jeweils ausgesucht aus der Liste, umfassend: Luftbürste und Vorhangbeschichter, letzterer in der möglichen Ausgestaltung sowohl als Schlitzgießer mit nach unten geöffnetem Farbkopf, aus dem sich unmittelbar der Farbvorhang bildet, wie auch in seiner Ausgestaltung als Gleitflächenbeschichter, bei dem der Farbkopf die Beschichtungsmasse auf ein schräg nach unten orientiertes Ablaufblech gibt, von wo aus sich der Farbvorhang bildet.

According to a preferred embodiment

• the first coating unit for applying the first coating composition to the front side of the web-shaped substrate
  and
• the second coating unit for applying the second coating composition to the back side of the web-shaped substrate
  each selected from the list, comprising: air brush and curtain coater, the latter in the possible embodiment both as Schlitzgießer with downwardly opened color head from which immediately forms the color curtain, as well as in its design as Gleitflächenbeschichter, in which the paint head, the coating mass on a obliquely downwardly oriented flow sheet gives, from where the color curtain forms.

• sowohl das erste Streichaggregat wie auch das zweite Streichaggregat verfahrensgleiche Streichaggregate sind, was bedeutet, dass beispielsweise
  □ das erste Streichaggregat wie auch das zweite Streichaggregat als Luftbürste ausgebildet sind,
  □ das erste Streichaggregat wie auch das zweite Streichaggregat als Schlitzgießer ausgebildet sind,
  □ das erste Streichaggregat wie auch das zweite Streichaggregat als Gleitflächenbeschichter ausgebildet sind,
• die erste Beschichtungszusammensetzung und die zweite Beschichtungszusammensetzung identisch sind, womit diese eine Beschichtungszusammensetzung dann auch verfahrenstechnisch besonders effektiv sowohl dem ersten Streichaggregat wie auch dem bevorzugt verfahrensgleichen zweiten Streichaggregat zugeführt wird.

It is particularly preferred if

• both the first coating unit and the second coating unit are process-identical coating units, which means that, for example
  □ the first coating unit as well as the second coating unit are designed as air brushes,
  □ the first coating unit as well as the second coating unit are designed as slot casters,
  □ the first coating unit as well as the second coating unit are designed as Gleitflächenbeschichter,
• the first coating composition and the second coating composition are identical, whereby this one coating composition is then also supplied in a particularly efficient process both the first coater and the second preferred coating coater.

• im ersten Maschinendurchlauf unter Nutzung dieses einen Streichaggregats als erstes Streichaggregat auf das bahnförmige Substrat vorderseitig der erste Pigmentauftrag
  und
• im zweiten Maschinendurchlauf unter Nutzung dieses einen Streichaggregats als zweites Streichaggregat auf das bahnförmige Substrat rückseitig der zweite Pigmentauftrag

aufgetragen wird. Genauso ist es möglich, dass tatsächlich zwei baugleiche Streichaggregate in eine Streichmaschine eingebaut werden, die dann durch eine gemeinsame Streichfarbenaufbereitungsanlage mit der jeweils gleichen Beschichtungszusammensetzung versorgt werden. In beiden Fällen ist es auf jeden Fall gewährleistet, dass das erfindungsgemäße Aufzeichnungsmaterial vorder- und rückseitig ein gleich ausgebildetes Erscheinungsbild aufweist.A method execution according to the previous paragraph can be implemented, for example, by using a coating machine with exactly one coating unit

• in the first machine run using this one coating unit as the first coating unit on the web-shaped substrate front side of the first pigment application
  and
• in the second machine pass using this one coating unit as a second coating unit on the web-shaped substrate on the back of the second pigment application

is applied. It is equally possible that in fact two identical coating units are installed in a coating machine, which are then supplied by a common coating color treatment plant with the same coating composition. In both cases, it is ensured in any case that the recording material according to the invention has an identically formed front and rear appearance.

In a preferred embodiment, the recording material produced by the method according to the invention may have a watermark, in particular in its execution as a true watermark or as a Moletten watermark, as at least one additional security feature. Since the recording material produced by the method according to the invention has at most a negligible visual appearance even when backlit with a very powerful lamp, such watermarks in the present case are not observed as usual in the review, but only in the grazing light, which is the underlying task to propose a recording material with an authentication feature that is not immediately recognizable on the finished recording material, in order to build up a certain surprise effect for potential counterfeiters.

• □ Unter CF-Blättern (coated front) werden im Sinne der vorliegenden Schrift Aufzeichnungsmaterialien für die druckinduzierte Schriftbildausbildung verstanden, welche auf einem Substrat eine Schicht mit Farbentwicklern (Farbnehmern bzw. Farbakzeptoren) aufweisen.
• □ Im Gegensatz zu den oben erklärten CF-Blättern weisen CB-Blätter auf einem Substrat CB-Schichten (coated back) auf, die, wie sie in der vorliegenden Schrift verstanden werden, Mikrokapseln enthalten, in denen sich in einem geeigneten Lösungsmittel Farbstoffvorläufer befinden. Grundsätzlich bewirkt die Ausübung eines lokal begrenzten Druckes auf die CB-Beschichtung beispielsweise durch Beschriftung mittels Stift oder Schreibmaschine ein Aufbrechen der Mikrokapseln, was zu einer Freisetzung der zuvor eingekapselten Farbstoffvorläufer führt. Kommen dann Farbstoffvorläufer aus den Mikrokapseln mit den Farbentwicklern innerhalb der CF-Schicht zusammen, kommt es zur Ausbildung einer Farbreaktion, die genau nur dort stattfindet, wo zuvor durch die Druckausübung die Mikrokapseln aufgebrochen sind: in der Regel geschieht dieses entlang einer Schriftlinie, die durch Beschriftung mittels Stift oder Schreibmaschine ausgebildet wird.
• □ CFB-Blätter weisen als Kombination aus CF- und CB-Blatt auf der einen Seite eine CF-Beschichtung und auf der gegenüberliegenden Seite eine CB-Beschichtung auf.
• □ Schließlich beinhaltet eine SC-Schicht sowohl eingekapselte Farbstoffvorläufer wie auch mit diesen Farbstoffvorläufern nach ihrer Freisetzung reagierende Farbentwickler.

The recording material produced by the process according to the invention can be used particularly convincingly in terms of as an offset to be printed recording material. Moreover, it is considered to be preferred if this after the β-βen invention Processed recording material is provided with further coatings to form it as CF, CB, SC or CFB sheet.

• For the purposes of the present specification, CF sheets (coated front) are recording materials for the pressure-induced typeface formation, which have a layer on a substrate with color developers (color acceptors or color acceptors).
• In contrast to the CF sheets explained above, CB sheets have on a substrate CB (coated back) layers which, as understood in the present specification, contain microcapsules containing dye precursors in a suitable solvent. In principle, the application of a localized pressure to the CB coating, for example by writing by means of a pen or a typewriter, causes the microcapsules to break up, resulting in a release of the previously encapsulated dye precursors. If dye precursors from the microcapsules then come together with the color developers within the CF layer, a color reaction takes place which occurs precisely where the microcapsules were previously broken by the application of pressure: as a rule, this takes place along a writing line which passes through Labeling is formed by a pen or typewriter.
• □ CFB sheets have a CF coating on one side and a CB coating on the opposite side as a combination of CF and CB sheets.
• Finally, an SC layer incorporates both encapsulated dye precursors and color developers reactive with these dye precursors upon release.

• ■ Vorbereiten einer vierten Beschichtungszusammensetzung, wobei diese vierte Beschichtungszusammensetzung mindestens aufweist:
  • einen Farbbildner,
  • einen Farbakzeptor;
• ■ Aufbringen der vorbereiteten vierten Beschichtungszusammensetzung zur Ausbildung einer wärmeempfindlichen Aufzeichnungsschicht auf dem Pigmentauftrag auf der Vorderseite des Substrates und/oder auf der Rückseite des Substrates;
• ■ Trocknen der vierten Beschichtungszusammensetzung.

In a most preferred embodiment, the recording material produced by the process according to the invention is formed as a heat-sensitive recording material. In this case, the method proposed here has at least the following further method steps:

• Prepare a fourth coating composition, said fourth coating composition comprising at least
  • a color former,
  • a color acceptor;
• Applying the prepared fourth coating composition to form a heat-sensitive recording layer on the pigment application on the front side of the substrate and / or on the backside of the substrate;
• ■ drying the fourth coating composition.

• ■ Vorbereiten einer dritten Beschichtungszusammensetzung, wobei diese dritte Beschichtungszusammensetzung mindestens aufweist:
  • ein Pigment,
  • ein Bindemittel;
• ■ Vorbereiten einer vierten Beschichtungszusammensetzung, wobei diese vierte Beschichtungszusammensetzung mindestens aufweist:
  • einen Farbbildner,
  • einen Farbakzeptor;
• ■ Aufbringen der vorbereiteten dritten Beschichtungszusammensetzung zur Ausbildung einer pigmentierten Zwischenschicht auf dem Pigmentauftrag auf der Vorderseite des Substrates und/oder auf der Rückseite des Substrates;
• ■ Trocknen der dritten Beschichtungszusammensetzung;
• ■ Aufbringen der vorbereiteten vierten Beschichtungszusammensetzung zur Ausbildung einer wärmeempfindlichen Aufzeichnungsschicht auf der pigmentierten Zwischenschicht auf der Vorderseite des Substrates und/oder auf der Rückseite des Substrates;
• ■ Trocknen der vierten Beschichtungszusammensetzung.

With very particular preference, the method proposed here has at least the following further method steps:

• Prepare a third coating composition, said third coating composition comprising at least
  • a pigment,
  • a binder;
• Prepare a fourth coating composition, said fourth coating composition comprising at least
  • a color former,
  • a color acceptor;
• Application of the prepared third coating composition to form a pigmented intermediate layer on the pigment application on the front side of the substrate and / or on the backside of the substrate;
• ■ drying the third coating composition;
• Applying the prepared fourth coating composition to form a heat-sensitive recording layer on the pigmented intermediate layer on the front side of the substrate and / or on the backside of the substrate;
• ■ drying the fourth coating composition.

• ■ 2,2 bis (4-hydroxyphenyl)-propan - auch bekannt als Bisphenol A,
• ■ 4-[(4-(1-methylethoxy)phenyl)sulfonyl]phenol - auch bekannt als D8,
• ■ N-(p-toluensulphonyl)-N'-(3-p-toluensulphonyl-oxy-phenyl)-harnstoff, auch bekannt als Pergafast® 201 der Firma BASF Corporation
• ■ 2,4'-dihydroxy-diphenylsulfon,
• ■ 4,4'-Dihydroxydiphenylsulfon,
• ■ N-(2-hydroxyphenyl)-2-[(4-hydroxyphenyl)thio]acetamid,

ohne auf die oberen Farbakzeptoren in irgendeiner Art und Weise beschränkt zu sein.The color former and the color acceptor contained in the fourth coating composition are to be selected such that the dye precursor and the color acceptor react with each other in a color-forming manner under the action of heat. In general, as a possible color acceptor, in particular at least one of the substances selected from the list is preferred, comprising:

• ■ 2,2 bis (4-hydroxyphenyl) -propane - also known as bisphenol A,
• ■ 4 - [(4- (1-methylethoxy) phenyl) sulfonyl] phenol - also known as D8,
• ■ N- (p-toluenesulphonyl) -N '- (3-p-toluenesulphonyl-oxy-phenyl) -urea, also known as Pergafast® 201 from BASF Corporation
• ■ 2,4'-dihydroxydiphenyl sulfone,
• 4,4'-dihydroxydiphenyl sulfone,
• N- (2-hydroxyphenyl) -2 - [(4-hydroxyphenyl) thio] acetamide,

without being limited to the upper color acceptors in any way.

• 3-diethylamino-6-methyl-7-Anilinofluoran, 3-dibutylamino-6-methyl-7-Anilinofluoran, 3-(N-methyl-N-propyl)amino-6-methyl-7-Anilinofluoran, 3-(N-ethyl-N-isoamyl)amino-6-methyl-7-Anilinofluoran, 3-(N-methyl-N-cyclohexyl)amino-6-methyl-7-Anilinofluoran, 3-(N-ethyl-N-tolyl)amino-6-methyl-7-Anilinofluoran und 3-(N-ethyl-N-tetrahydrofuryl)amino-6-methyl-7-Anilinofluoran. Ganz besonders bevorzugt ist dabei 3-dibutylamino-6-methyl-7-Anilinofluoran - auch bekannt als ODB-2.

The fourth coating composition for forming the heat-sensitive recording layer preferably comprises, as a dye precursor, those selected from the list, comprising:

• 3-diethylamino-6-methyl-7-anilinofluoran, 3-dibutylamino-6-methyl-7-anilinofluoran, 3- (N-methyl-N-propyl) amino-6-methyl-7-anilinofluoran, 3- (N- ethyl-N-isoamyl) amino-6-methyl-7-anilinofluoran, 3- (N-methyl-N-cyclohexyl) amino-6-methyl-7-anilinofluoran, 3- (N-ethyl-N-tolyl) amino 6-methyl-7-anilinofluoran and 3- (N-ethyl-N-tetrahydrofuryl) amino-6-methyl-7-anilinofluoran. Very particular preference is given to 3-dibutylamino-6-methyl-7-anilinofluoran - also known as ODB-2.

It is possible that the fourth coating composition for forming the thermosensitive recording layer has more than one dye precursor, then preferably each selected from the dye precursors listed in the above paragraph.

• Stearinsäureamid,
• Dimethylsulfon und
• 2-(2H-benzotriazol-2-yl)-p-cresol, auch bekannt als Tinuvin^® der Firma BASF Corporation,

die entsprechend einer ersten bevorzugten Ausführungsvariante allein, das bedeutet, nicht in Kombination mit einem anderen Sensibilisator, insbesondere nicht mit einem solchen aus den drei genannten Sensibilisatoren der vorstehenden Liste, eingesetzt sind. Entsprechend einer zweiten, gleichsam bevorzugten Ausführungsvariante können auch zwei Sensibilisatoren, ausgesucht aus der Liste umfassend Stearinsäureamid, Dimethylsulfon und 2-(2H-benzotriazol-2-yl)-p-cresol, in der vierten Beschichtungszusammensetzung zur Ausbildung der wärmeempfindlichen Aufzeichnungsschicht eingebunden werden. Von den drei genannten Sensibilisatoren gilt Dimethylsulfon als ganz besonders bevorzugt.The fourth coating composition for forming the thermosensitive recording layer most preferably contains at least one sensitiser, especially selected from the list, for the purpose of increasing thermal responsiveness

• stearic acid amide,
• Dimethyl sulfone and
• 2- (2H-benzotriazol-2-yl) -p-cresol, also known as Tinuvin ^® from BASF Corporation,

which according to a first preferred embodiment alone, that is, are not used in combination with another sensitizer, in particular not with such from the three mentioned sensitizers of the above list. Corresponding In a second, as it were preferred, variant embodiment, two sensitizers selected from the list comprising stearic acid amide, dimethylsulfone and 2- (2H-benzotriazol-2-yl) -p-cresol can also be incorporated in the fourth coating composition for forming the heat-sensitive recording layer. Of the three sensitizers mentioned, dimethylsulfone is considered to be very particularly preferred.

Suitable binders for incorporation in the fourth coating composition for forming the thermosensitive recording layer are, for example, water-soluble binders such as starch, hydroxyethylcellulose, methylcellulose, carboxymethylcellulose, gelatin, casein, polyvinyl alcohols, modified polyvinyl alcohols, ethylene-vinyl alcohol copolymers, sodium polyacrylates, acrylamide-acrylate copolymers, acrylamide Acrylate-methacrylate terpolymers and alkali metal salts of styrene-maleic anhydride copolymer or ethylene-maleic anhydride copolymer, which binders can be used alone or in combination with one another; Water-insoluble latex binders such as styrene-butadiene copolymers, acrylonitrile-butadiene copolymers and methyl acrylate-butadiene copolymers are also suitable as binders for incorporation into the heat-sensitive recording layer. For the purposes of the present invention, polyvinyl alcohol, ethylene-vinyl alcohol copolymers or polyvinyl alcohol in combination with ethylene-vinyl alcohol copolymers are particularly preferred binders which together in a range from 10 to 20% by weight, based on the total weight of the heat-sensitive recording layer. are incorporated in the heat-sensitive recording layer.

To improve the sliding properties on a thermal head and to avoid excessive wear of the thermal head, the coating composition for forming the heat-sensitive recording layer may further contain lubricants and release agents such as metal salts of higher fatty acids, for example, zinc stearate, calcium stearate and waxes such as paraffin, oxidized paraffin, Polyethylene, polyethylene oxide, stearamides and castor wax. Further constituents of the recording layer are, if appropriate, for example pigments, preferably inorganic pigments such as, for example, aluminum (hydr) oxide, silica and calcium carbonate, in which case in particular calcium carbonate, which is preferably present in an amount of from 0 to 45% by weight, very particularly preferably in an amount of 10 to 40 wt .-%, in each case based on the total weight of the recording layer, to be involved in the recording layer is considered to be preferred.

Preferably, the fourth coating composition for forming the heat-sensitive recording layer is applied by means of a coating unit, selected from the list, comprising: roller blade coater, knife coater, curtain coater (in slot caster or sliding surface caster design) and air brush. Incidentally, the fourth coating composition used to form the heat-sensitive recording layer is preferably aqueous. The subsequent drying of the coating composition is usually done by a method in which heat is supplied, as is done by hot-air floating dryer or contact dryer. Proven is also a combination of the listed dry processes. The basis weight of the heat-sensitive recording layer is preferably between 2 and 6 g / m ² in the method proposed here for producing a recording material having an authentication feature.

The coating units preferably used for the formation of the pigmented intermediate layer are, in particular, leveling coating units selected from the list, comprising: roller coater, doctor blade coater or doctor blade coater. Especially in a method using one of these mentioned coating method, such a pigmented intermediate layer can make a positive contribution to the leveling of the surface to be spread, which reduces the amount of applied mass of a usually expensive coating composition for forming the heat-sensitive recording layer. The subsequent drying of the coating composition to form the pigmented intermediate layer is done again and here usually by a method in which heat is supplied, as is done by hot-air floating dryer or contact dryer. Proven is also a combination of the listed dry processes. For the basis weight of the pigmented intermediate layer, a preferred range between 5 and 20 g / m ² and even better between 7 and 12 g / m ^{2 has} proven.

This third coating composition for forming the pigmented intermediate layer contains binders and preferably a mixture of optional organic pigments and inorganic pigments. The inorganic pigments are thereby preferred, individually or in combination with one another, selected from the list, comprising: silicon (di) oxide, bentonite, talc, calcined kaolin, calcium carbonate and aluminum oxide and here in particular boehmite. The above inorganic pigments, individually or in combination with one another, selected from the list above, are quoted as one of the list comprising: calcined kaolin, calcium carbonate and aluminum oxide, and here especially boehmite.

In addition to the inorganic and optionally also organic pigments, the third coating composition for forming the pigmented intermediate layer contains at least one binder preferably based on a synthetic polymer, wherein, for example, styrene-butadiene latex gives particularly good results. The use of a synthetic binder with the admixture of at least one natural polymer, such as particularly preferred starch, represents a particularly suitable embodiment.

• ■ Vorbereiten einer fünften Beschichtungszusammensetzung;
• ■ Aufbringen der vorbereiteten fünften Beschichtungszusammensetzung zur Ausbildung einer die wärmeempfindliche Aufzeichnungsschicht vollflächig abdeckenden Schutzschicht auf der Vorderseite des Substrates und/oder auf der Rückseite des Substrates;
• ■ Trocknen der fünften Beschichtungszusammensetzung.

In addition, if the method proposed on this side comprises those process steps with which a heat-sensitive recording layer is formed, it is particularly preferred if such a heat-sensitive recording layer is finally also covered with a protective layer. For this purpose, the method proposed on this side comprises in a preferred form at least the following further method steps:

• ■ preparing a fifth coating composition;
• Applying the prepared fifth coating composition to form a protective layer covering the heat-sensitive recording layer over the entire area on the front side of the substrate and / or on the back side of the substrate;
• ■ drying the fifth coating composition.

Most preferably, the fifth coating composition for forming a heat-sensitive recording layer over the entire surface covering protective layer as a binder to at least 60 wt .-% - based on the total content of binder - diacetone-modified polyvinyl alcohol. In addition to the diacetone-modified polyvinyl alcohol, in a first possible embodiment, the fifth coating composition may comprise further binders, in particular mixtures of different carboxyl-group- or silanol-modified polyvinyl alcohols. These preferably make up at most 40% by weight, very particularly preferably at most 15% by weight, based on the total amount of binder in the fifth coating composition. In a second possible embodiment, the fifth coating composition comprises as binder exclusively diacetone-modified polyvinyl alcohol. In particular, when diacetone-modified polyvinyl alcohol is the sole binder in the fifth coating composition, it is considered particularly preferable that the binder content in the fifth coating composition is in a range of 35 to 65% by weight, based on the total weight of the fifth coating composition.

Suitable crosslinking aids in the fifth coating composition are, in particular, those selected from the group comprising: boric acid, polyamine, epoxy resin, dialdehyde, formaldehyde oligomers, epiochlorohydrin resin, adipic dihydrazide, dimethylurea, melamine-formaldehyde. It is also possible to use mixtures of different crosslinking aids.

It is preferable that, within the fifth coating composition, the ratio of the weight percent of the binder, especially the diacetone-modified polyvinyl alcohol, to the crosslinking aid is in a range of 20: 1 to 5: 1, and more preferably in a range of 12: 1 to 7: 1 lies.

Particularly good results have been achieved if the fifth coating composition additionally contains an inorganic pigment. It is particularly recommended that the inorganic pigment is selected from the group comprising silica, aluminum hydroxide, bentonite, calcium carbonate, kaolin or a mixture of said inorganic pigments. In this case, in particular, a ratio of pigment and here very particularly preferably of kaolin to the diacetone-modified polyvinyl alcohol in a range of 1: 1.5 to 1: 4.5 set, the ratio here based on the respective wt .-% of pigment and Polyvinyl alcohol in the fifth coating composition.

As a coating device for application of the fifth coating composition, in particular, offer a roll doctor coater, knife coater, curtain coater or air brush. The basis weight of the protective layer formed in this way is preferably between 1.0 and 3.0 g / m ² and more preferably between 1.6 and 2.3 g / m ² .

• ■ Vorbereiten einer sechsten Beschichtungszusammensetzung und Aufbringen der vorbereiteten sechsten Beschichtungszusammensetzung zur Ausbildung einer Tintenempfangsschicht auf dem Pigmentauftrag auf der Vorderseite des Substrates und/oder auf der Rückseite des Substrates;
• ■ Trocknen der sechsten Beschichtungszusammensetzung.

It is also possible and is insofar as preferred, if at least one side, that is front and / or back, on the color-intensely colored in the mass web-like substrate with the formed on the substrate front achromatic pigment application and with the trained on the substrate back pigment application an ink-receiving layer is trained. For this purpose, then includes this proposed Process in a preferred form at least the following further process steps:

• ■ preparing a sixth coating composition and applying the prepared sixth coating composition to form an ink-receiving layer on the pigment coating on the front side of the substrate and / or on the back surface of the substrate;
• Drying the sixth coating composition.

• der Pigmentauftrag aus der ersten und/oder zweiten Beschichtungszusammensetzung,
• die wärmeempfindliche Aufzeichnungsschicht aus der vierten Beschichtungszusammensetzung oder
• die eine wärmeempfindliche Aufzeichnungsschicht abdeckende Schutzschicht aus der fünften Beschichtungszusammensetzung

sein - anbietet.It is possible and applies against this background as a preferred possible embodiment of this proposed method to provide further method steps for implementing further security features in the recording material according to all embodiments and variants proposed here. Such security features may be, in particular, security fibers and planchettes, their integration being particularly advantageous in the respective outermost layer of the recording material - this may be, for example

• the pigment application from the first and / or second coating composition,
• the heat-sensitive recording layer of the fourth coating composition or
• the protective layer of the fifth coating composition covering a heat-sensitive recording layer

be - offers.

Recording materials produced according to at least one of the many methods proposed here and thus having at least one instantly recognizable, possibly surprising effect for possible counterfeiting representing authentication feature in the form of a hidden color intensive substrate and optionally an additional security feature, are particularly well suited for use as high-quality tickets, be it in the form of tickets, be it in the form of tickets, which is why such use is considered particularly preferred.

The details given in the description and patent claims relating to basis weight,% by weight (% by weight) and parts by weight (parts by weight) relate in each case to the "atro" weight, ie absolutely dry parts by weight. In the versions to the organic pigments, the relevant figures are calculated from the "lutro" weight, ie air-dry parts by weight, minus the weight fraction of water around and inside the pigments in their form of delivery.

The following examples 2 and 3 according to the invention together with comparative example 1 will further explain the invention.

A total of three in the mass in strong and intense red-colored web-like, coating-free and unsized papers with a basis weight of 62 g / m ² are provided on a coating machine in each first machine run using an air brush on the front with a pigment whose area-related mass in Example 1 15 g / m ² , in Example 2 29 g / m ² and in Example 3 35 g / m ² . On the reverse side, the papers of all three examples receive a pigment application of 35 g / m ² in each case the second machine run using the already used air brush. For all front and back side pigment applications, the same coating composition is used which, in addition to a binder content of 23% by weight, has kaolin with a content of 43.53% by weight and titanium dioxide with a proportion of 30.75% by weight , The papers provided with a pigment coating on both sides then receive a slight calendering.

The example 1 appears unacceptably reddish on the front in the context of a visual assessment, it thus does not fulfill the task of providing a recording material to which one can not immediately view the authentication feature in the form of a color-intensive substrate. Example 2 still has a barely noticeable touch of a rose-appearing surface on the front, which can only be detected when the user knows something of the red substrate inside the recording material. Against this background, this example is good. However, example 3 appears completely white on the front and back, it can be classified as very good.

• ■ für das Beispiel 1 mit dem nicht akzeptablen vorderseitigen Pigmentauftrag eine Opazität von 73%,
• ■ für das Beispiel 2 mit dem als gut beurteilten vorderseitigen Pigmentauftrag eine Opazität von 88,4%,
• ■ für das Beispiel 3 mit dem als sehr gut beurteilten vorderseitigen Pigmentauftrag eine Opazität von 92,5%

gemessen. Dabei erfolgt die Bestimmung der Opazität nach der ISO-Norm 2471 (Ausgabe 12/2008), die Grundlagen für die Messung ergeben sich aus den Vorgaben der ISO-Norm 2469 (Ausgabe 06/2007).On overhead PE films with an opacity of 2%, the coating composition is applied in the laboratory on one side with the basis weights which were also used for Examples 1 to 3. It will

• ■ for example 1 with the unacceptable front-side pigment application, an opacity of 73%,
• ■ for example 2 with the well-judged front-side pigment coating an opacity of 88.4%,
• ■ for Example 3 with the very good rated front-side pigment application an opacity of 92.5%

measured. The determination of the opacity according to the ISO standard 2471 (issue 12/2008), the basis for the measurement result from the requirements of ISO standard 2469 (issue 06/2007).

On the papers according to Examples 2 and 3, a pigmented intermediate layer of 9 g / m ^{2 is} formed on the front side, using a coating composition with a pigment mixture of hollow body pigment and calcined kaolin and with styrene-butadiene latex and starch as a binder combination becomes.

• ■ Farbbildner: 3-dibutylamino-6-methyl-7-Anilinofluoran, das ist: ODB-2;
• ■ Farbakzeptor : 2,2 bis (4-hydroxyphenyl)-propan - das ist Bisphenol A;
• ■ Bindemittel: Polyvinylalkohol in Verbindung mit Ethylen-Vinylalkohol-Coplymer;
• ■ Hilfsmittel: Gleitmittel (Zinkstearat), Wachse, Vernetzer.

Using a roller blade coating, a heat-sensitive recording layer having a basis weight of 4.2 g / m ² is then formed on the front side of the previously dried pigmented intermediate layer, for which purpose a coating composition comprising the following main components is used:

• ■ Color former: 3-dibutylamino-6-methyl-7-anilinofluoran, which is: ODB-2;
• ■ color acceptor: 2,2 bis (4-hydroxyphenyl) -propane - this is bisphenol A;
• ■ Binder: polyvinyl alcohol in combination with ethylene-vinyl alcohol copolymer;
• ■ Auxiliaries: Lubricant (zinc stearate), waxes, crosslinkers.

• ■ Diaceton-modifizierten Polyvinylalkohol als Bindemittel,
• ■ Epiochlorhydrinharz als Vernetzungshilfsmittel,
• ■ Aluminiumhydroxid als Pigment und
• ■ fluoreszierende Sicherheitsfasern als weiteres Sicherheitsmerkmal enthält. Die Aufzeichnungsmaterialen gemäß der beiden Beispiele 2 und 3 werden vor Ihrer Konfektionierung mittels Rollenschneidern noch einer leichten Kalandrierung unterzogen. Die entsprechend der vorstehenden Versuchsbeschreibung hergestellten Aufzeichnungsmaterialien gemäß der Beispiele 2 und 3 sind besonders gut geeignet zur Verwendung als hochwertige Tickets, sei es in Form von Eintrittskarten, sei es in Form von Fahrscheinen. Für den Benutzer stellen sie zunächst übliche weiße Tickets mit wärmeempfindlicher Aufzeichnungsschicht dar, die vorderseitig in der äußeren Schicht fluoreszierende Sicherheitsfasern als scheinbar einziges Sicherheitsmerkmal aufweisen. Erst bei einem Zerreißen der Tickets tritt das erfindungswesentliche Authentifikationsmerkmal in Form des farbintensiven Substrats an der Reißkante wegen der unregelmäßigen und unterschiedlichen Reißkanten von Substrat und von den darauf ausgebildeten Pigmentaufträgen völlig überraschend in Erscheinung. Damit erfüllen die entsprechend der vorstehenden Versuchsbeschreibung hergestellten Aufzeichnungsmaterialien gemäß der Beispiele 2 und 3 vollends die der Erfindung zugrundeliegende Aufgabe.

In the case of Example 3, this heat-sensitive recording layer additionally has fluorescent security fibers as another security feature. In the case of Example 2, a protective layer having a basis weight of 1.9 g / m ^{2 is} formed on the heat-sensitive recording layer still using an air brush, which as main components

• ■ Diacetone-modified polyvinyl alcohol as a binder,
• ■ epiochlorohydrin resin as a crosslinking aid,
• ■ Aluminum hydroxide as a pigment and
• ■ Fluorescent safety fibers as another security feature contains. The recording materials according to the two examples 2 and 3 are subjected to a light calendering prior to their manufacture by means of slitters. The recording materials according to Examples 2 and 3 prepared according to the above test description are particularly well suited for use as high quality tickets, be it in the form of tickets or in the form of tickets. For the user, they initially present conventional white tickets with a heat-sensitive recording layer, which in the outer layer in the outer layer have fluorescent security fibers as the seemingly single security feature. Only when the tickets are torn does the authentification feature essential to the invention in the form of the color-intensive substrate at the tearing edge appear completely surprisingly because of the irregular and different tearing edges of the substrate and of the pigment applications formed thereon. Thus, the recording materials prepared according to the above experimental description according to Examples 2 and 3 completely fulfill the object underlying the invention.

Claims (15)

Method for producing a recording material having an authentification feature with a mass-dyed web-shaped substrate and a pigment application covering the substrate at least on one side, characterized in that the method has at least the following method steps: Forming a mass-intensive colored substrate sheet-like substrate,
having a front side as the first of the two substrate sides and a back side as the second of the two substrate sides; ■ preparing a first coating composition, said first coating composition comprising at least one pigment and a binder; ■ preparing a second coating composition, said second coating composition comprising at least one pigment and a binder; Supplying the prepared first coating composition to a first coating unit and applying the first coating composition with the first coating unit to the front side of the web-shaped substrate moved during application relative to the first coating unit to form an achromatic pigment application over the entire area covering the substrate on its front side,
that the achromatic pigment coating of the first coating composition has an opacity in a range of 80% to 100%; Drying the first coating composition; Feeding the prepared second coating composition to a second coating unit and applying the second coating composition with the second coating unit to the back side of the web-shaped substrate moved during application relative to the second coating unit to form the pigment application over the entire surface covering the substrate on its rear side,
that the pigment coating of the second coating composition has an opacity in a range of 80% to 100%; ■ drying the second coating composition. A process for producing a recording material according to claim 1, characterized in that at least the pigment coating of the first coating composition has an opacity in a range of 90% to 100%. A method of producing a recording material according to any one of claims 1 and 2, characterized in that the first coating unit and the second coating unit are respectively selected from the list comprising: air brush and curtain coater. Process for the preparation of a recording material according to one of claims 1 and 3, characterized in that the color-intensely colored substrate is a paper. Process for the production of a recording material according to one of the claims 1 to 4, characterized in that both the first coating unit and the second coating unit are process-same coating units. A process for producing a recording material according to any one of claims 1 to 5, characterized in that the first coating composition and the second coating composition are identical. A process for producing a recording material according to any one of claims 1 to 6, characterized in that the first coating composition and / or the second coating composition comprises as pigment a pigment mixture of at least one inorganic pigment and at least one organic pigment. A method for producing a recording material according to claim 7, characterized in that the at least one inorganic pigment in the first coating composition and / or in the second coating composition a pigment selected from the list comprising: alumina, silica, calcium carbonate, kaolin, titania, barium sulfate, zinc oxide, zinc sulfite. A process for producing a recording material according to any one of claims 7 to 8, characterized in that the at least one inorganic pigment in the first coating composition and / or in the second coating composition is titanium dioxide. Method for producing a recording material according to one of the claims 1 to 9, characterized in that the recording material has a watermark as at least one additional security feature. Method for producing a recording material according to one of the claims 1 to 10, characterized in that the method comprises at least the following further method steps: Prepare a fourth coating composition, said fourth coating composition comprising at least a color former, a color acceptor; Applying the prepared fourth coating composition to form a heat-sensitive recording layer on the pigment application on the front side of the substrate and / or on the backside of the substrate; ■ drying the fourth coating composition. Method for producing a recording material according to one of the claims 1 to 10, characterized in that the method comprises at least the following further method steps: Prepare a third coating composition, said third coating composition comprising at least a pigment, a binder; Prepare a fourth coating composition, said fourth coating composition comprising at least a color former, a color acceptor; Application of the prepared third coating composition to form a pigmented intermediate layer on the pigment application on the front side of the substrate and / or on the backside of the substrate; ■ drying the third coating composition; Applying the prepared fourth coating composition to form a heat-sensitive recording layer on the pigmented intermediate layer on the front side of the substrate and / or on the backside of the substrate; ■ drying the fourth coating composition. Process for producing a recording material according to one of the claims 11 to 12, characterized in that the process comprises at least the following further process steps: ■ preparing a fifth coating composition; Applying the prepared fifth coating composition to form a protective layer covering the heat-sensitive recording layer over the entire area on the front side of the substrate and / or on the back side of the substrate; ■ drying the fifth coating composition. Method for producing a recording material according to one of the claims 1 to 10, characterized in that the method comprises at least the following further method steps: ■ preparing a sixth coating composition and applying the prepared sixth coating composition to form an ink-receiving layer on the pigment coating on the front side of the substrate and / or on the back surface of the substrate; Drying the sixth coating composition. Method for producing a recording material according to one of the claims 1 to 14, characterized in that the recording material is at least another security feature selected from the list, comprising: - safety fibers, - planchettes.