EP1319104B1 - Security sheet comprising a transparent or translucent layer - Google Patents

Security sheet comprising a transparent or translucent layer Download PDF

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Publication number
EP1319104B1
EP1319104B1 EP01969862A EP01969862A EP1319104B1 EP 1319104 B1 EP1319104 B1 EP 1319104B1 EP 01969862 A EP01969862 A EP 01969862A EP 01969862 A EP01969862 A EP 01969862A EP 1319104 B1 EP1319104 B1 EP 1319104B1
Authority
EP
European Patent Office
Prior art keywords
sheet
optionally
silica
security
parts
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP01969862A
Other languages
German (de)
French (fr)
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EP1319104A1 (en
Inventor
Henri Rosset
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
ArjoWiggins Security SAS
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ArjoWiggins Security SAS
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Publication date
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Publication of EP1319104A1 publication Critical patent/EP1319104A1/en
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Publication of EP1319104B1 publication Critical patent/EP1319104B1/en
Anticipated expiration legal-status Critical
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Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
    • D21H21/14—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties characterised by function or properties in or on the paper
    • D21H21/40—Agents facilitating proof of genuineness or preventing fraudulent alteration, e.g. for security paper
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H19/00—Coated paper; Coating material
    • D21H19/36—Coatings with pigments
    • D21H19/38—Coatings with pigments characterised by the pigments
    • D21H19/40—Coatings with pigments characterised by the pigments siliceous, e.g. clays
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
    • Y10T428/24479—Structurally defined web or sheet [e.g., overall dimension, etc.] including variation in thickness
    • Y10T428/24521—Structurally defined web or sheet [e.g., overall dimension, etc.] including variation in thickness with component conforming to contour of nonplanar surface
    • Y10T428/24529—Structurally defined web or sheet [e.g., overall dimension, etc.] including variation in thickness with component conforming to contour of nonplanar surface and conforming component on an opposite nonplanar surface
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
    • Y10T428/24802—Discontinuous or differential coating, impregnation or bond [e.g., artwork, printing, retouched photograph, etc.]
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
    • Y10T428/24802—Discontinuous or differential coating, impregnation or bond [e.g., artwork, printing, retouched photograph, etc.]
    • Y10T428/24893—Discontinuous or differential coating, impregnation or bond [e.g., artwork, printing, retouched photograph, etc.] including particulate material
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
    • Y10T428/24802—Discontinuous or differential coating, impregnation or bond [e.g., artwork, printing, retouched photograph, etc.]
    • Y10T428/24893—Discontinuous or differential coating, impregnation or bond [e.g., artwork, printing, retouched photograph, etc.] including particulate material
    • Y10T428/24901—Discontinuous or differential coating, impregnation or bond [e.g., artwork, printing, retouched photograph, etc.] including particulate material including coloring matter
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
    • Y10T428/24802—Discontinuous or differential coating, impregnation or bond [e.g., artwork, printing, retouched photograph, etc.]
    • Y10T428/24893—Discontinuous or differential coating, impregnation or bond [e.g., artwork, printing, retouched photograph, etc.] including particulate material
    • Y10T428/24909—Free metal or mineral containing
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
    • Y10T428/24802—Discontinuous or differential coating, impregnation or bond [e.g., artwork, printing, retouched photograph, etc.]
    • Y10T428/24934—Discontinuous or differential coating, impregnation or bond [e.g., artwork, printing, retouched photograph, etc.] including paper layer
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/31504—Composite [nonstructural laminate]
    • Y10T428/31971—Of carbohydrate
    • Y10T428/31993—Of paper

Definitions

  • the invention relates to a security sheet that can be used to produce security documents, that is printable and that has a high print quality, as well as a high resistance to movement, especially after printing.
  • the invention relates more particularly to paper sheets for banknotes or other securities that can be printed in particular by offset printing and / or intaglio printing.
  • security documents for example banknote or check papers or any other valuable document, include chemical or physical means of authentication and / or indicators of forgery.
  • thermographic recording film having a transparent overlay comprising a polymeric binder and a mixture of at least two colloidal silicas of different average diameter, the total ratio of the silicas to the binder being at least 3 parts by weight of silica to 1 part by weight of binder and further the proportions and sizes respectively to the silicas being selected such that 1 part by weight of silica with a diameter less than or equal to 50 nm and 0.3 to 1 part of silica particles with a diameter of at most 40% of the larger particles.
  • This selection makes it possible to have a resistant layer and having a level of "fuzziness" so low a high transparency. This technical field is different from that of the security sheets.
  • the Applicant after having tried numerous compositions containing at least one binder and at least one filler, has surprisingly succeeded in solving the problems posed by using a composition containing at least one colloidal silica and at least one elastomeric binder. , transparent or translucent.
  • the invention provides a layered security sheet with elements characterized in that at least one of its faces is coated with a transparent or translucent layer comprising at least one colloidal silica and at least one of its faces is coated with a transparent or translucent layer comprising at least one colloidal silica and at least one less an elastomeric binder, transparent or translucent.
  • the elastomeric binder can be used, however, in admixture with other binders usually used in paper milling while ensuring the transparency of the layer and without impairing the level of durability.
  • the elastomeric binder is chosen from the group formed by the polyurethanes that can be used in the form of dispersions stabilized in an aqueous medium (latex).
  • said polyurethane is selected from polyurethanes of high hardness, this seems to improve the anti-blocking of the layer during the handling of treated sheets.
  • colloidal silica is a fumed silica.
  • Preferably it has a specific surface area measured according to the BET method (DIN 66 131 standard) of between 300 and 400 m 2 / g; the BET method giving a measure of the total specific surface area.
  • the layer gives the sheet and the security document obtained a particularly high resistance to global circulation, while allowing a very good impression rendering. More preferably still, said layer is characterized in that it comprises about 40 parts of said silica and about 60 parts of said binder, by dry weight, the sum of the parts of these components making 100 in total, the result obtained appearing optimum for this composition.
  • the sheet according to the invention is characterized by the fact that said binder is associated with a crosslinking agent, in particular a polyaziridine.
  • a crosslinking agent in particular a polyaziridine.
  • the sheet according to the invention is characterized in that the weight of the deposited layer is between 1 and 15 g / m 2 per dry side, preferably between 1 and 10 g / m 2 per side, preferably between 2 and 7 g / m 2 per dry side.
  • the layer may comprise other dispersant additives, viscosity modifiers, plasticizers, bacteriostatic agents, fungicides for example. It can not be ruled out that it includes other authentication or tampering agents.
  • the sheet to be treated according to the invention may be a sheet based on a composition of cellulosic fibers and / or cotton fibers and / or synthetic fibers.
  • the sheet may also be a sheet of synthetic material, such as those used to make plastic banknotes. This sheet can consist of a single jet or several jets.
  • the sheet is a cotton fiber paper for bank notes and comprises a wet strength agent, especially a melamine-formaldehyde or poly (amide-amine-epichlorohydrin) resin.
  • a wet strength agent especially a melamine-formaldehyde or poly (amide-amine-epichlorohydrin) resin.
  • the invention also provides a method of manufacturing said sheet.
  • a sheet is formed on a paper machine possibly comprising a watermarking device, from a composition comprising cellulose and / or cotton fibers, a wet strength agent. , and boards.
  • composition it is possible to use any usual means of coating in stationery, for example coils of the gravure, reverse-roll, champion, billblade, trailing blade, air knife type or TWIN HSM type film transfer system or an impregnator.
  • coils of the gravure, reverse-roll, champion, billblade, trailing blade, air knife type or TWIN HSM type film transfer system or an impregnator for example coils of the gravure, reverse-roll, champion, billblade, trailing blade, air knife type or TWIN HSM type film transfer system or an impregnator.
  • the invention also relates to a bank note obtained from a sheet as described above or obtained according to the method described above.
  • the viscosity is adjusted using rheology modifiers commonly used in the field of printing-writing layers for paper.
  • the weight of the layer deposited in dry state is 4 g / m 2 .
  • Example 2 Another example is made as in Example 2 but the deposited amount of the layer is 6 g / m 2 dry.
  • results are estimated visually [with the naked eye or with a magnifying device (magnifying glass, microscope)] and by comparison.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Dispersion Chemistry (AREA)
  • Paper (AREA)
  • Laminated Bodies (AREA)
  • Manufacture Of Macromolecular Shaped Articles (AREA)
  • Paints Or Removers (AREA)

Abstract

The invention relates to a coated sheet of security paper which includes security elements and has a high print rendition and a high resistance to circulation, which sheet is characterized in that at least one of its sides is coated with a transparent or translucent coating comprising at least one colloidal silica and at least one transparent or translucent elastomeric binder. In particular, the binder is a polyurethane. The invention also relates to the process for manufacturing the said sheet and to a banknote obtained from this sheet.

Description

L'invention concerne une feuille de sécurité utilisable pour fabriquer des documents de sécurité, qui est imprimable et qui possède un rendu d'impression élevé, ainsi qu'une résistance à la circulation élevée, notamment après impression.The invention relates to a security sheet that can be used to produce security documents, that is printable and that has a high print quality, as well as a high resistance to movement, especially after printing.

L'invention concerne plus particulièrement des feuilles de papier pour billets de banque ou autres titres de valeur qui peuvent notamment être imprimées par impression offset et/ou par impression taille-douce.The invention relates more particularly to paper sheets for banknotes or other securities that can be printed in particular by offset printing and / or intaglio printing.

On sait que les documents de sécurité, par exemple les papiers pour billets de banque ou pour chèques ou tout autre titre de valeur comportent des moyens chimiques ou physiques d'authentification et/ou indicateurs de la falsification.It is known that security documents, for example banknote or check papers or any other valuable document, include chemical or physical means of authentication and / or indicators of forgery.

En général, il est connu d'utiliser comme moyens chimiques, des composés qui réagissent aux agents de falsification utilisés couramment par les falsificateurs. Ces moyens indicateurs de falsification réagissent par exemple aux acides (chlorhydrique, citrique, acétique, sulfurique, etc...), aux bases (soude notamment), aux oxydants (eau de javel notamment), aux réducteurs et aux solvants.In general, it is known to use as chemical means compounds that react to the forgery agents commonly used by falsifiers. These tamper-indicating means react, for example, with acids (hydrochloric, citric, acetic, sulfuric, etc.), with bases (especially sodium hydroxide), with oxidants (bleach in particular), with reducing agents and with solvents.

Il est aussi connu d'utiliser des moyens physiques d'authentification qui sont le plus souvent les suivants :

  • l'absence d'azurants optiques fluorescents en bleu-violet lorsqu'ils sont soumis à la lumière ultra-violette, qui sont couramment utilisés dans la composition des papiers ordinaires afin d'augmenter leur blancheur,
  • la présence ponctuelle d'éléments de sécurité (par exemple des fils, fibres, planchettes, etc) qui peuvent présenter des effets optiques variables, être colorés ou comporter des inscriptions ou posséder des propriétés physiques diverses telles que le magnétisme, la conductivité électrique, le thermomagnétisme, etc..., et qui peuvent être disposés au moins partiellement à l'intérieur de la feuille,
  • la présence de filigrane, c'est-à-dire une modification contrôlée de la densité des fibres de papier dans l'épaisseur de celui-ci, ce filigrane reproduisant un dessin donné qui n'est visible parfaitement qu'en lumière transmise, c'est-à-dire par transparence,
  • la présence d'hologrammes, de moirages ou d'autres effets optiques obtenus avec des encres optiquement variables et déposés à la surface de la feuille,
  • le claquant du papier, c'est-à-dire un bruit caractéristique obtenu lorsqu'on agite rapidement le papier,
  • la présence d'impressions à la surface du papier sous forme de dessins ou d'inscriptions de couleurs et de formes complexes qui sont de ce fait difficiles à reproduire,
  • le relief de l'impression obtenue par le procédé d'impression taille-douce. Ce procédé consiste à graver une plaque, à étendre une encre sur cette plaque et à presser la feuille de papier sur la plaque.
It is also known to use physical authentication means that are most often the following:
  • the absence of fluorescent optical brighteners in blue-violet when subjected to ultraviolet light, which are commonly used in the composition of ordinary papers to increase their whiteness,
  • the punctual presence of security elements (for example wires, fibers, boards, etc.) which may have variable optical effects, be colored or have inscriptions or have various physical properties such as magnetism, electrical conductivity, thermomagnetism, etc ..., and which can be arranged at least partially inside the sheet,
  • the presence of a watermark, that is to say a controlled modification of the density of the paper fibers in the thickness of the latter, this watermark reproducing a given design which is only perfectly visible in transmitted light, c 'ie by transparency,
  • the presence of holograms, moirés or other optical effects obtained with optically variable inks deposited on the surface of the sheet,
  • the slap of the paper, that is to say a characteristic noise obtained when the paper is rapidly agitated,
  • the presence of prints on the surface of the paper in the form of drawings or inscriptions of colors and complex shapes that are therefore difficult to reproduce,
  • the relief of the impression obtained by the intaglio printing process. This process involves etching a plate, spreading an ink on that plate and pressing the sheet of paper onto the plate.

Dans le document EP-A-0521423 , on a décrit un film d'enregistrement thermographique comportant une surcouche transparente, cette couche comportant un liant polymère et un mélange d'au moins deux silices colloïdales de diamètre moyen différent, le ratio total des silices au liant étant d'au moins 3 parts en poids de silice pour 1 part en poids de liant et par ailleurs les proportions et les tailles respectives aux silices étant sélectionnées telles que l'on ait 1 part en poids de silice d'un diamètre inférieur ou égal à 50 nm et 0,3 à 1 part de particules de silice d'un diamètre d'au plus 40 % des particules de plus large taille. Cette sélection permet d'avoir une couche résistante et présentant un niveau de « flou » bas donc une transparence élevée. Ce domaine technique est différent de celui des feuilles de sécurité.In the document EP-A-0521423 a thermographic recording film having a transparent overlay has been described, this layer comprising a polymeric binder and a mixture of at least two colloidal silicas of different average diameter, the total ratio of the silicas to the binder being at least 3 parts by weight of silica to 1 part by weight of binder and further the proportions and sizes respectively to the silicas being selected such that 1 part by weight of silica with a diameter less than or equal to 50 nm and 0.3 to 1 part of silica particles with a diameter of at most 40% of the larger particles. This selection makes it possible to have a resistant layer and having a level of "fuzziness" so low a high transparency. This technical field is different from that of the security sheets.

On a décrit dans la demande de brevet européen EP-A-514455 et la demande correspondante WO-A-91/12372 , une feuille de sécurité ayant une résistance à la circulation élevée et une bonne imprimabilité, cette feuille comportant une couche faite de charges minérales et d'un liant élastomère, en particulier un polyuréthane. L'un des inconvénients de cette feuille est que l'observation des éléments de sécurité qu'elle comporte tels que le filigrane, fil de sécurité, planchettes ou autres éléments à effet optique notamment variable, est diminuée.It has been described in the European patent application EP-A-514455 and the corresponding request WO-A-91/12372 , a security sheet having a high resistance to circulation and good printability, this sheet having a layer made of mineral fillers and an elastomeric binder, in particular a polyurethane. One of the drawbacks of this sheet is that the observation of the security elements that it comprises, such as the watermark, security thread, boards or other elements with a particularly variable optical effect, is reduced.

L'invention vise donc à fournir une feuille destinée à la fabrication de documents de sécurité, en particulier de billets de banque, qui possède simultanément les propriétés suivantes :

  • une très bonne observation des éléments de sécurité que comporte la feuille,
  • un rendu d'impression élevé,
  • une résistance élevée à la circulation, notamment après impression c'est-à-dire conférant une durabilité élevée au document de sécurité obtenu à partir de cette feuille.
The invention therefore aims at providing a sheet intended for the manufacture of security documents, in particular bank notes, which simultaneously has the following properties:
  • a very good observation of the security elements contained in the sheet,
  • high print quality,
  • a high resistance to the circulation, especially after printing that is to say, conferring high durability to the security document obtained from this sheet.

La Demanderesse, après avoir essayé de nombreuses compositions contenant au moins un liant et au moins une charge, est parvenue, de façon surprenante, à résoudre les problèmes posés en utilisant une composition contenant au moins une silice colloïdale et au moins un liant de caractère élastomère, transparent ou translucide.The Applicant, after having tried numerous compositions containing at least one binder and at least one filler, has surprisingly succeeded in solving the problems posed by using a composition containing at least one colloidal silica and at least one elastomeric binder. , transparent or translucent.

Ainsi l'invention fournit une feuille de sécurité couchée comportant des éléments de sécurité, ayant un rendu d'impression et une résistance à la circulation élevés, qui se caractérise par le fait qu'au moins l'une de ses faces est revêtue d'une couche transparente ou translucide comprenant au moins une silice colloïdale et au moins un liant élastomère, transparent ou translucide.Thus, the invention provides a layered security sheet with elements characterized in that at least one of its faces is coated with a transparent or translucent layer comprising at least one colloidal silica and at least one of its faces is coated with a transparent or translucent layer comprising at least one colloidal silica and at least one less an elastomeric binder, transparent or translucent.

Plus précisément l'invention a pour objet une feuille de sécurité dont au moins l'une de ses faces est revêtue d'une couche comportant un liant élastomère transparent ou translucide et une silice, et ayant un rendu d'impression, notamment en taille douce, et une résistance à la circulation élevés, qui se caractérise par le fait que ladite feuille comporte des éléments de sécurité observables et que ladite couche est transparente ou translucide et qu'elle comporte :

  • 30 à 50 parties en poids sec de ladite silice, ladite silice étant une silice colloïdale, et
  • 50 à 70 parties en poids sec dudit liant élastomère transparent ou translucide,
la somme des parties de ces deux composants faisant 100 au total.More specifically, the subject of the invention is a security sheet of which at least one of its faces is coated with a layer comprising a transparent or translucent elastomeric binder and a silica, and having a print rendering, especially in soft-sizing , and a high resistance to circulation, which is characterized in that said sheet comprises observable security elements and that said layer is transparent or translucent and that it comprises:
  • 30 to 50 parts by dry weight of said silica, said silica being a colloidal silica, and
  • 50 to 70 parts by dry weight of said transparent or translucent elastomeric binder,
the sum of the parts of these two components making 100 in total.

Le liant élastomère peut être employé cependant en mélange avec d'autres liants habituellement utilisés en papeterie tout en veillant à maintenir la transparence de la couche et sans nuire au niveau de durabilité.The elastomeric binder can be used, however, in admixture with other binders usually used in paper milling while ensuring the transparency of the layer and without impairing the level of durability.

De préférence le liant élastomère est choisi dans le groupe formé par les polyuréthanes utilisables sous forme de dispersions stabilisées en milieu aqueux (latex).Preferably, the elastomeric binder is chosen from the group formed by the polyurethanes that can be used in the form of dispersions stabilized in an aqueous medium (latex).

De préférence ledit polyuréthane est choisi parmi les polyuréthanes de haute dureté, ceci semble améliorer l'anti-blocage de la couche lors de la manipulation des feuilles traitées.Preferably said polyurethane is selected from polyurethanes of high hardness, this seems to improve the anti-blocking of the layer during the handling of treated sheets.

De préférence ladite silice colloïdale est une silice pyrogénée.Preferably said colloidal silica is a fumed silica.

De préférence elle a une surface spécifique mesurée selon la méthode BET (norme DIN 66 131) comprise entre 300 et 400 m2/g; la méthode BET donnant une mesure de la surface spécifique totale.Preferably it has a specific surface area measured according to the BET method (DIN 66 131 standard) of between 300 and 400 m 2 / g; the BET method giving a measure of the total specific surface area.

En particulier ladite couche comporte :

  • 1 à 95 parties en poids sec de ladite silice,
  • 5 à 99 parties en poids sec dudit liant élastomère,
la somme des parties de ces composants faisant au total 100.In particular said layer comprises:
  • 1 to 95 parts by dry weight of said silica,
  • 5 to 99 parts by dry weight of said elastomeric binder,
the sum of the parts of these components making a total of 100.

Dans cette fourchette, il apparaît que la couche confère à la feuille et au document de sécurité obtenu, une résistance à la circulation globale particulièrement élevée, tout en permettant un rendu d'impression très bon. Plus préférentiellement encore, ladite couche se caractérise en ce qu'elle comporte environ 40 parties de ladite silice et environ 60 parties dudit liant, en poids sec, la somme des parties de ces composants faisant 100 au total, le résultat obtenu apparaissant optimum pour cette composition.In this range, it appears that the layer gives the sheet and the security document obtained a particularly high resistance to global circulation, while allowing a very good impression rendering. More preferably still, said layer is characterized in that it comprises about 40 parts of said silica and about 60 parts of said binder, by dry weight, the sum of the parts of these components making 100 in total, the result obtained appearing optimum for this composition.

De préférence la feuille selon l'invention se caractérise par le fait ledit liant est associé à un agent réticulant, en particulier une polyaziridine.Preferably, the sheet according to the invention is characterized by the fact that said binder is associated with a crosslinking agent, in particular a polyaziridine.

La feuille selon l'invention se caractérise par le fait que le poids de la couche déposée est compris entre 1 et 15 g/m2 par face en sec, de préférence entre 1 et 10 g/m2 par face, de préférence encore entre 2 et 7 g/m2 par face en sec.The sheet according to the invention is characterized in that the weight of the deposited layer is between 1 and 15 g / m 2 per dry side, preferably between 1 and 10 g / m 2 per side, preferably between 2 and 7 g / m 2 per dry side.

La couche peut comporter d'autres additifs dispersants, agents modificateurs de la viscosité, plastifiants, agents bactériostatiques, fongicides par exemple. Il n'est pas exclu qu'elle comporte d'autres agents d'authentification ou d'infalsification.The layer may comprise other dispersant additives, viscosity modifiers, plasticizers, bacteriostatic agents, fungicides for example. It can not be ruled out that it includes other authentication or tampering agents.

La feuille à traiter selon l'invention peut être une feuille à base d'une composition de fibres cellulosiques et/ou de fibres de coton et/ou de fibres synthétiques. La feuille peut être aussi une feuille de matière synthétique, notamment telles que celles utilisées pour faire des billets de banque en plastique. Cette feuille peut être constituée d'un seul jet ou de plusieurs jets.The sheet to be treated according to the invention may be a sheet based on a composition of cellulosic fibers and / or cotton fibers and / or synthetic fibers. The sheet may also be a sheet of synthetic material, such as those used to make plastic banknotes. This sheet can consist of a single jet or several jets.

De préférence la feuille est un papier à base de fibres de coton pour billets de banque et comporte un agent de résistance humide, notamment une résine mélamine-formol ou poly(amide-amine-épychlorhydrine).Preferably, the sheet is a cotton fiber paper for bank notes and comprises a wet strength agent, especially a melamine-formaldehyde or poly (amide-amine-epichlorohydrin) resin.

L'invention fournit aussi un procédé de fabrication de ladite feuille.The invention also provides a method of manufacturing said sheet.

On réalise en particulier la feuille selon le procédé qui comporte les étapes suivantes :

  • on forme une feuille sur une machine à papier comportant un dispositif de filigranage, à partir d'une composition de fibres de cellulose et/ou de coton, et un agent de résistance humide, et éventuellement des planchettes,
  • on inclut éventuellement dans et/ou sur la feuille, des éléments de sécurité, tels qu'un fil de sécurité et/ou des éléments avec un effet optiquement variable,
  • on traite éventuellement la feuille par un agent de collage en presse encolleuse ou imprégnatrice,
  • on enduit ensuite cette feuille avec une composition réalisée en milieu aqueux contenant :
  • ladite silice colloïdale, utilisée sous forme d'une dispersion aqueuse,
  • ledit liant élastomère, utilisé sous forme d'une dispersion aqueuse,
  • un agent réticulant le cas échéant,
  • éventuellement d'autres additifs utilisés en papeterie,
  • on sèche la feuille vers 100°C.
In particular, the sheet is produced according to the process which comprises the following steps:
  • forming a sheet on a paper machine comprising a watermarking device, from a composition of cellulose fibers and / or cotton, and a wet strength agent, and possibly boards,
  • optionally included in and / or on the sheet are security elements, such as a security thread and / or elements with an optically variable effect,
  • the sheet is optionally treated with a gluing agent in a gluing or impregnating press,
  • this sheet is then coated with a composition made in an aqueous medium containing:
  • said colloidal silica, used in the form of an aqueous dispersion,
  • said elastomeric binder, used in the form of an aqueous dispersion,
  • a crosslinking agent where appropriate,
  • possibly other additives used in paper industry,
  • the sheet is dried at about 100 ° C.

Selon une variante du procédé de fabrication décrit ci-dessus, on forme une feuille sur une machine à papier comportant éventuellement un dispositif de filigranage, à partir d'une composition comportant des fibres de cellulose et/ou de coton, un agent de résistance humide, et des planchettes.According to a variant of the manufacturing method described above, a sheet is formed on a paper machine possibly comprising a watermarking device, from a composition comprising cellulose and / or cotton fibers, a wet strength agent. , and boards.

Selon une autre variante, le procédé de fabrication de ladite feuille selon l'invention comprend les étapes suivantes :

  • on forme une feuille sur une machine à papier comportant éventuellement un dispositif de filigranage, à partir d'une composition comportant des fibres de cellulose et/ou de coton, un agent de résistance humide, et éventuellement des planchettes,
  • on inclut dans et/ou sur la feuille, des éléments de sécurité, tels qu'un fil de sécurité et/ou des éléments avec un effet optiquement variable,
  • on traite éventuellement la feuille par un agent de collage en presse encolleuse ou imprégnatrice,
  • on enduit ensuite cette feuille avec une composition réalisée en milieu aqueux contenant :
    • ladite silice colloïdale, utilisée sous forme d'une dispersion aqueuse,
    • ledit liant élastomère, utilisé sous forme d'une dispersion aqueuse,
    • un agent réticulant le cas échéant,
    • éventuellement d'autres additifs utilisés en papeterie,
  • on sèche la feuille vers 100°C.
According to another variant, the method of manufacturing said sheet according to the invention comprises the following steps:
  • forming a sheet on a paper machine optionally comprising a watermarking device, from a composition comprising cellulose and / or cotton fibers, a wet strength agent, and possibly boards,
  • safety elements, such as a safety wire and / or elements with an optically variable effect, are included in and / or on the sheet,
  • the sheet is optionally treated with a gluing agent in a gluing or impregnating press,
  • this sheet is then coated with a composition made in an aqueous medium containing:
    • said colloidal silica, used in the form of an aqueous dispersion,
    • said elastomeric binder, used in the form of an aqueous dispersion,
    • a crosslinking agent where appropriate,
    • possibly other additives used in paper industry,
  • the sheet is dried at about 100 ° C.

Pour déposer ladite composition, on peut utiliser tout moyen d'enduction usuel en papeterie, par exemple des coucheuses du type héliogravure, "reverse-roll", "champion", "billblade", à lame trainante, à lame d'air ou un système à transfert de film du type dit TWIN HSM ou une imprégnatrice.To deposit said composition, it is possible to use any usual means of coating in stationery, for example coils of the gravure, reverse-roll, champion, billblade, trailing blade, air knife type or TWIN HSM type film transfer system or an impregnator.

L'invention concerné aussi un billet de banque obtenu à partir d'une feuille telle que décrite ci-avant ou obtenue selon le procédé décrit précédemment.The invention also relates to a bank note obtained from a sheet as described above or obtained according to the method described above.

Les exemples non limitatifs suivants, permettront de mieux comprendre comment l'invention peut être mise en pratique et ses avantages.The following nonlimiting examples will make it possible to better understand how the invention can be put into practice and its advantages.

EXEMPLE 1 comparatif:EXAMPLE 1 comparative:

On forme la feuille de papier sur une machine à papier dite de forme ronde avec une toile comportant un motif permettant de faire un filigrane, ce papier pouvant convenir comme papier pour fabriquer un billet de banque, de la façon suivante :

  • on met en suspension dans de l'eau une pâte de fibres de coton, on raffine cette suspension à 60° SCHOEPPER-RIEGLER,
  • on ajoute un agent de résistance humide, environ 2,5% en poids sec d'une résine poly(amide-amine-epychlorhydrine), exprimés par rapport aux fibres de coton,
  • on introduit également dans cette suspension des planchettes iridescentes,
  • on introduit lors de la formation de la feuille, un fil de sécurité microimprimé dit "window thread", selon les techniques antérieures connues de manière à faire apparaître ce fil dans certaines fenêtres à la surface du papier. Une méthode utilisable pour introduire ce fil est décrite par exemple dans le brevet EP59056 .
  • après avoir formé la feuille, on la traite en surface en presse encolleuse par un agent de collage.
  • on sèche la feuille vers 100°C.
The sheet of paper is formed on a so-called round paper machine with a fabric having a pattern for making a watermark, this paper may be suitable as paper for making a banknote, as follows:
  • a slurry of cotton fibers is suspended in water, this slurry is refined to 60 ° SCHOEPPER-RIEGLER,
  • a wet strength agent, about 2.5% by dry weight of a poly (amide-amine-epichlorohydrin) resin, based on the cotton fibers is added,
  • iridescent boards are also introduced into this suspension,
  • during the formation of the sheet is introduced a security micro-printed thread called "window thread", according to known prior art techniques so as to make this thread appear in certain windows on the surface of the paper. A method that can be used to introduce this yarn is described for example in the patent EP59056 .
  • after having formed the sheet, it is surface-treated in a gluing press by a gluing agent.
  • the sheet is dried at about 100 ° C.

Les caractéristiques et résultats des tests effectués sur cette feuille sont donnés dans les tableaux 1 à 3.The characteristics and results of the tests carried out on this sheet are given in Tables 1 to 3.

EXEMPLE 2 selon l'invention :EXAMPLE 2 according to the invention

On reprend un support obtenu selon l'Exemple 1 que l'on couche avec une coucheuse à lame d'air avec une composition réalisée en milieu aqueux qui comporte :

  • 39 parts, en poids sec d'un liant élastomère polyuréthane commercialisé sous le nom de « Cromelastic SE871»,
  • 61 parts, en poids sec d'une silice colloïdale pyrogénée commercialisée sous le nom de « Cab-O-Sperse PG002 », par la Société CABOT,
  • on ajoute un agent réticulant polyaziridine à raison de 3 parts pour 100 parts des composants précédents.
A support obtained according to Example 1 is taken up and coated with an air knife coater with a composition made in an aqueous medium which comprises:
  • 39 parts, by dry weight of a polyurethane elastomer binder marketed under the name "Cromelastic SE871",
  • 61 parts, by dry weight of a fumed colloidal silica marketed under the name "Cab-O-Sperse PG002", by CABOT,
  • a polyaziridine crosslinking agent is added in a proportion of 3 parts per 100 parts of the preceding components.

La viscosité est réglée à l'aide de modificateurs de rhéologie habituellement utilisée dans le domaine des couches impression-écriture pour le papier.The viscosity is adjusted using rheology modifiers commonly used in the field of printing-writing layers for paper.

Le poids de la couche déposée en sec est de 4 g/m2.The weight of the layer deposited in dry state is 4 g / m 2 .

On imprime cette feuille en taille-douce et on lui fait subir différents tests.We print this sheet in intaglio and we make him undergo different tests.

Les caractéristiques et résultats de ces tests sont présentés dans les tableaux 1 à 3.The characteristics and results of these tests are presented in Tables 1 to 3.

EXEMPLE 3 selon l'invention :EXAMPLE 3 according to the invention

On réalise un autre exemple comme à l'exemple 2 mais la quantité déposée de la couche est de 6 g/m2 en sec.Another example is made as in Example 2 but the deposited amount of the layer is 6 g / m 2 dry.

Les caractéristiques et résultats de ces tests sont présentés dans les tableaux 1 et 2.The characteristics and results of these tests are presented in Tables 1 and 2.

EXEMPLE 4 selon l'invention:EXAMPLE 4 according to the invention

On réalise un support comme à l'exemple 2 mais avec les quantités en liant et silice suivantes :

  • 51 parts, en poids sec d'un liant élastomère polyuréthane commercialisé sous le nom de « Cromelastic SE871»,
  • 49 parts, en poids sec d'une silice colloïdale pyrogénée commercialisée sous le nom de « Cab-O-Sperse PG002 », par la Société CABOT.
A support is made as in Example 2 but with the following amounts of binder and silica:
  • 51 parts, by dry weight of a polyurethane elastomer binder marketed under the name "Cromelastic SE871",
  • 49 parts, by dry weight of a fumed colloidal silica marketed under the name "Cab-O-Sperse PG002", by CABOT.

Les caractéristiques et résultats des tests effectués sur cette feuille sont donnés dans les tableaux 2 à 3.The characteristics and results of the tests carried out on this sheet are given in Tables 2 to 3.

EXEMPLE 5 selon l'invention : EXAMPLE 5 according to the invention

On réalise un support comme à l'exemple 2 mais avec les quantités en liant et silice suivantes:

  • 61 parts, en poids sec d'un liant élastomère polyuréthane commercialisé sous le nom de « Cromelastic SE871»,
  • 39 parts, en poids sec d'une silice colloïdale pyrogénée commercialisée sous le nom de « Cab-O-Sperse PG002 », par la Société CABOT.
A support is made as in Example 2 but with the following amounts of binder and silica:
  • 61 parts, by dry weight of a polyurethane elastomer binder marketed under the name "Cromelastic SE871",
  • 39 parts, by dry weight of a fumed colloidal silica marketed under the name "Cab-O-Sperse PG002", by CABOT.

Les caractéristiques et résultats des tests effectués sur cette feuille sont donnés dans les tableaux 2 à 3.The characteristics and results of the tests carried out on this sheet are given in Tables 2 to 3.

EXEMPLE 6 selon l'invention :EXAMPLE 6 according to the invention

On réalise un support comme à l'exemple 2 mais avec les quantités en liant et silice suivantes :

  • 76 parts, en poids sec d'un liant élastomère polyuréthane commercialisé sous le nom de « Cromelastic SE871»,
  • 24 parts, en poids sec d'une silice colloïdale pyrogénée commercialisée sous le nom de « Cab-O-Sperse PG002 », par la Société CABOT.
A support is made as in Example 2 but with the following amounts of binder and silica:
  • 76 parts, by dry weight of a polyurethane elastomer binder marketed under the name "Cromelastic SE871",
  • 24 parts, by dry weight of a fumed colloidal silica marketed under the name "Cab-O-Sperse PG002", by CABOT.

Les caractéristiques et résultats des tests effectués sur cette feuille sont donnés dans les tableaux 2 à 3.The characteristics and results of the tests carried out on this sheet are given in Tables 2 to 3.

TESTS ET RESULTATS:TESTS AND RESULTS:

On vérifie que les feuilles fabriquées selon l'invention s'impriment bien par impression taille-douce et en offset. On vérifie par microscopie électronique à balayage que le rendu d'impression taille-douce est très bon.It is verified that the sheets manufactured according to the invention are printed well by intaglio printing and offset. It is verified by scanning electron microscopy that the intaglio print rendering is very good.

Leur résistance à la circulation après impression taille-douce est testée selon les critères suivants :

  • résistance aux froissements en milieu humide,
  • résistance aux frottements en milieu humide,
  • résistance à la salissure en milieu humide.
Par ailleurs on vérifie aussi la visibilité des éléments de sécurité (planchettes, fil) à travers la couche.Their resistance to circulation after intaglio printing is tested according to the following criteria:
  • crease resistance in a humid environment,
  • resistance to friction in a humid environment,
  • resistance to soiling in a humid environment.
In addition, the visibility of the security elements (boards, wire) through the layer is also verified.

Les tests de résistance à la circulation en ce qui concerne les résistances aux froissements et aux frottements sont décrits dans l'article: WEARING QUALITY OF EXPERIMENTAL CURRENCY-TYPE PAPERS, Journal of Research of the National Bureau of Standards, Volume 36, pages 249 à 268, mars 1946 .
Les résultats sont présentés dans le tableau 2.The tests of resistance to the circulation with regard to the resistance to creases and friction are described in the article: WEARING QUALITY OF EXPERIMENTAL CURRENCY-TYPE PAPERS, Journal of Research of the National Bureau of Standards, Volume 36, pp. 249-268, March 1946 .
The results are shown in Table 2.

On teste la résistance à la lessivabilité des échantillons imprimés par taille-douce pour simuler un passage en machine à laver. Ce test de résistance à la lessivabilité des feuilles imprimées est effectué de la manière suivante :

  • On met une éprouvette de papier dans un flacon contenant de l'eau et de la lessive placé sur un appareil TURBULA mis en rotation pendant 1 heure. On évalue la dégradation visuellement et selon une échelle interne de notation de 1 (minimum) à 5 (maximum). Les résultats sont présentés dans le tableau 2.
The leaching resistance of intaglio printed samples is tested to simulate washing machine passage. This leachability resistance test of the printed sheets is carried out as follows:
  • A paper test tube is placed in a vial containing water and detergent placed on a TURBULA apparatus rotated for 1 hour. The degradation is evaluated visually and according to an internal rating scale of 1 (minimum) to 5 (maximum). The results are shown in Table 2.

Les résultats sont estimés visuellement [à l'oeil nu ou avec un dispositif grossissant (loupe, microscope)] et par comparaison.The results are estimated visually [with the naked eye or with a magnifying device (magnifying glass, microscope)] and by comparison.

Le test de résistance à la salissure humide des feuilles imprimées est effectué de la manière suivante :

  • On découpe chaque feuille des exemples en plusieurs éprouvettes.
  • On fait subir un froissement à chaque éprouvette dans un appareil à froissement IGT.
  • Puis on le défroisse manuellement, on la met dans un flacon qui ferme hermétiquement en présence de billes en céramique de 20 mm de diamètre et d'une poudre contenant des colorants jaune, brun, du noir de carbone, de la vermicullite, une composition de sueur artificielle et une composition de suintine.
  • Le flacon est placé dans un appareil TURBULA qui est mis en rotation sur une durée totale de 15 minutes. Afin de simuler le veillissement des échantillons, pour un papier donné, on réalise une cinétique de salissure en déterminant la blancheur selon la norme ISO 2471 (réflectance à 457 nm) et le degré de jaune avant salissure puis au bout d'un temps donné. On prend une éprouvette de papier sur laquelle on fait ces déterminations au bout de 5 minutes de salissure, sur une autre éprouvette du même papier, on fait ces déterminations au bout de 10 minutes de salissure, on refait les mêmes déterminations sur une autre éprouvette au bout de 15 minutes.
  • Le degré de jaune a été déterminé sur un spectrocolorimètre ELREPHO 2000 dans le système CIE sous illuminant D65 (lumière du jour et sans UV) et sous un angle d'observation de 10 degrés.
  • Pour apprécier le résultat, on compare les différences de blancheur ou de degré de jaune avant et après salissure à un temps donné. Plus la différence est faible, meilleure est la résistance. On calcule aussi la moyenne des différences à la fois de la blancheur et du degré de jaune pour avoir une évaluation de la résistance moyenne à la salissure. Les résultats sont présentés dans le tableau 3.
The wet soiling test of the printed sheets is carried out as follows:
  • Each sheet of the examples is cut into several test pieces.
  • Each specimen is wrinkled in an IGT crumper.
  • Then it is uncrushed manually, it is put in a bottle which closes hermetically in the presence of ceramic balls of 20 mm in diameter and a powder containing dyes yellow, brown, carbon black, vermicullite, a composition of artificial sweat and a composition of suintine.
  • The vial is placed in a TURBULA device which is rotated for a total of 15 minutes. In order to simulate the aging of the samples, for a given paper, a soil kinetics is carried out by determining the whiteness according to the ISO 2471 standard (reflectance at 457 nm) and the degree of yellow before soiling then at the end of a given time. We take a test piece of paper on which we make these determinations after 5 minutes of soiling, on another test piece of the same paper, we make these determinations after 10 minutes of soiling, we redo the same determinations on another test tube. after 15 minutes.
  • The degree of yellowness was determined on an ELREPHO 2000 spectrocolorimeter in the CIE system under D65 illuminant (daylight and without UV) and at an observation angle of 10 degrees.
  • To appreciate the result, we compare the differences in whiteness or degree of yellow before and after soiling at a given time. The smaller the difference, better is the resistance. The average of the differences in both whiteness and degree of yellowness are also averaged to give an estimate of the average resistance to soiling. The results are shown in Table 3.

On observe que le rendu d'impression est nettement meilleur pour les feuilles réalisées selon l'invention.
On observe que la résistance de la feuille à la circulation globale (voir tableaux 2 et 3) est nettement supérieure à celle du témoin. Dans le cas de l'exemple 4, il apparaît que la résistance à la circulation globale est optimum par rapport aux autres exemples faits selon l'invention.It is observed that the print rendering is much better for the sheets produced according to the invention.
It is observed that the resistance of the leaf to the global circulation (see Tables 2 and 3) is clearly greater than that of the control. In the case of Example 4, it appears that the overall resistance to the circulation is optimum compared to other examples made according to the invention.

Pour tous les exemples selon l'invention, on observe bien le filigrane, l'effet iridescent des planchettes ainsi que les inscriptions sur le fil de sécurité, à travers ladite couche. TABLEAU 1 Exemple 1 comparatif Exemple 2 Exemple 3 Grammage g/m2 86,5 92,9 95,2 Epaisseur µm 104 116 115 Main cm3/g 1,20 1,25 1,21 Porosité Bendtsen cm3/min 7,85 <5 <5 Lisse bekk R/V s 35,6-30,4 21,0-14,8 24,6-17,6 Opacité fond papier % 86,1 87,5 86,9 Eclatement Sec/Humide
Résistance à l'état humide kPa
% 459-234
50,1 452-238
52,7 464-226
48,7 Taux de cendres % 1,87 6,12 6,93 TABLEAU 2 Résistance au froissement humide - après 16 froissements Résistance à la lessivabilité - après 1 heure Résistance au frottement en milieu humide : Nombre d'aller-retour pour observer un début de dégradation visuelle EAU JAVEL Exemple 1 Comparatif 4,0 3,5 150 <50 Exemple 2 4,5 5,0 500 70 Exemple 3 5,0 4,5 550 60 Exemple 4 - 4,5 1000 120 Exemple 5 - 4,0 1000 160 Exemple 6 - 2,5 400 180 TABLEAU 3 BLANCHEUR DEGRE DE JAUNE moyenne des différences Blancheur - degré de jaune temps avant après différence avant après différence exemple 1 5 min 79,79 65,76 14,03 8,92 22,14 13,2 13,6 10 min 79,82 65,32 14,50 8,85 22,43 13,6 14,0 15 min 79,76 66,29 13,47 9,01 21,53 12,5 13,0 exemple 2 5 min 79,2 73,3 5,9 9,67 14,46 4,79 5,35 10 min 79,3 71,4 7,9 9,57 16,22 6,65 7,28 15 min 79,3 69,6 9,7 9,68 17,84 8,16 8,93 exemple 4 5 min 79,3 72,7 6,6 9,73 15,20 5,47 6,04 10 min 79,0 70,0 9,0 10,17 17,69 7,52 8,26 15 min 79,2 67,1 12,1 9,96 20,26 10,3 11,2 exemple 5 5 min 78,14 73,52 4,62 10,60 14,24 3,64 4,13 10 min 78,20 72,01 6,19 10,70 15,19 4,49 5,34 15 min 78,19 71,70 6,49 10,77 15,81 5,04 5,77 exemple 6 5 min 77,78 74,02 3,76 11,12 13,94 2,82 3,29 10 min 77,80 72,76 5,04 10,90 14,43 3,53 4,29 15 min 77,89 71,82 6,07 10,75 15,42 4,67 5,37 For all the examples according to the invention, the watermark, the iridescent effect of the boards as well as the inscriptions on the security thread, are clearly observed through said layer. <u> TABLE 1 </ u> Comparative Example 1 Example 2 Example 3 weight g / m 2 86.5 92.9 95.2 Thickness microns 104 116 115 Hand cm 3 / g 1.20 1.25 1.21 Porosity Bendtsen cm 3 / min 7.85 <5 <5 Smooth bekk R / V s 35.6 to 30.4 21.0 to 14.8 24.6 to 17.6 Opacity paper background % 86.1 87.5 86.9 Dry / Wet Burst
Resistance in the wet state kPa
% 459-234
50.1 452-238
52.7 464-226
48.7 Ash rate % 1.87 6.12 6.93 Wet crease resistance - after 16 creases Resistance to laundering - after 1 hour Resistance to rubbing in a humid environment: Number of round trips to observe a beginning of visual degradation WATER BLEACH Comparative Example 1 4.0 3.5 150 <50 Example 2 4.5 5.0 500 70 Example 3 5.0 4.5 550 60 Example 4 - 4.5 1000 120 Example 5 - 4.0 1000 160 Example 6 - 2.5 400 180 WHITENESS DEGREE OF YELLOW average of differences Whiteness - degree of yellowness time before after difference before after difference example 1 5 min 79.79 65.76 14,03 8.92 22,14 13.2 13.6 10 minutes 79.82 65.32 14.50 8.85 22.43 13.6 14.0 15 min 79.76 66.29 13.47 9.01 21,53 12.5 13.0 example 2 5 min 79.2 73.3 5.9 9.67 14.46 4.79 5.35 10 minutes 79.3 71.4 7.9 9.57 16.22 6.65 7.28 15 min 79.3 69.6 9.7 9.68 17.84 8.16 8.93 example 4 5 min 79.3 72.7 6.6 9.73 15.20 5.47 6.04 10 minutes 79.0 70.0 9.0 10.17 17.69 7.52 8.26 15 min 79.2 67.1 12.1 9.96 20.26 10.3 11.2 example 5 5 min 78.14 73.52 4.62 10.60 14.24 3.64 4.13 10 minutes 78.20 72,01 6.19 10.70 15.19 4.49 5.34 15 min 78,19 71.70 6.49 10.77 15.81 5.04 5.77 example 6 5 min 77.78 74.02 3.76 11,12 13.94 2.82 3.29 10 minutes 77.80 72.76 5.04 10,90 14.43 3.53 4.29 15 min 77.89 71.82 6.07 10.75 15.42 4.67 5.37

Claims (13)

  1. Security sheet, at least one of its sides being coated with a layer comprising a transparent or translucent elastomer binder and a silica, said sheet having a high print rendering, especially in intaglio printing, and a high resistance to circulation, characterized in that said sheet includes observable security elements and in that said layer is transparent or translucent and contains:
    - 30 to 50 parts by dry weight of said silica, said silica being a colloidal silica; and
    - 50 to 70 parts by dry weight of said transparent or translucent elastomer binder,
    the sum of the parts of these two components making a total of 100.
  2. Sheet according to Claim 1, characterized in that the elastomer binder is chosen from the group formed by polyurethanes that can be used in the form of stabilized aqueous dispersions.
  3. Sheet according to either of Claims 1 and 2, characterized in that said polyurethane is chosen from high-hardness polyurethanes.
  4. Sheet according to one of the preceding claims, characterized in that said silica is a pyrogenic silica.
  5. Sheet according to one of the preceding claims, characterized in that said silica has a specific surface area measured using the BET method (DIN 66 131 standard) of between 300 and 400 m2/g.
  6. Sheet according to the preceding claim, characterized in that said layer comprises about 40 parts of said silica and about 60 parts of said binder, by dry weight, the sum of the parts of these components making a total of 100.
  7. Sheet according to one of the preceding claims, characterized in that said composition includes a crosslinking agent, in particular a polyaziridine.
  8. Sheet according to one of the preceding claims, characterized in that the layer is deposited between 1 and 15 g/m2 per side, as dry, preferably between 1 and 10 g/m2 per side and more preferably between 2 and 7 g/m2 per side.
  9. Sheet of paper for banknotes, which includes a security sheet, according to one of the preceding claims.
  10. Process for manufacturing a sheet according to one of the preceding claims, comprising the following steps:
    - a sheet is formed on a paper machine that includes a watermarking device, from a composition comprising cellulose fibres and/or cotton fibres, a wet-strength agent and optionally planchettes;
    - optionally included in and/or on the sheet are security elements, such as a security thread and/or elements with an optically variable effect;
    - optionally, the sheet is treated with a sizing agent in a size press or an impregnating press;
    - this sheet is then coated with a composition made from an aqueous medium containing:
    • said colloidal silica, used in the form of an aqueous dispersion,
    • said elastomer binder, used in the form of an aqueous dispersion,
    • where appropriate, a crosslinking agent and
    • optionally, other additives used in papermaking; and
    - the sheet is dried at about 100°C.
  11. Process for manufacturing a sheet according to one of the preceding Claims 1 to 9, comprising the following steps:
    - a sheet is formed on a paper machine that optionally includes a watermarking device, from a composition comprising cellulose fibres and/or cotton fibres, a wet-strength agent and planchettes;
    - optionally included in and/or on the sheet are security elements, such as a security thread and/or elements with an optically variable effect;
    - optionally, the sheet is treated with a sizing agent in a size press or an impregnating press;
    - this sheet is then coated with a composition made from an aqueous medium containing:
    • said colloidal silica, used in the form of an aqueous dispersion,
    • said elastomer binder, used in the form of an aqueous dispersion,
    • where appropriate, a crosslinking agent and
    • optionally, other additives used in papermaking; and
    - the sheet is dried at about 100°C.
  12. Process for manufacturing a sheet according to one of the preceding Claims 1 to 9, comprising the following steps:
    - a sheet is formed on a paper machine that optionally includes a watermarking device, from a composition comprising cellulose fibres and/or cotton fibres, a wet-strength agent and optionally planchettes;
    - included in and/or on the sheet are security elements, such as a security thread and/or elements with an optically variable effect;
    - optionally, the sheet is treated with a sizing agent in a size press or an impregnating press;
    - this sheet is then coated with a composition made from an aqueous medium containing:
    • said colloidal silica, used in the form of an aqueous dispersion,
    • said elastomer binder, used in the form of an aqueous dispersion,
    • where appropriate, a crosslinking agent and
    • optionally, other additives used in papermaking; and
    - the sheet is dried at about 100°C.
  13. Banknote obtained from a sheet according to one of Claims 1 to 9 or obtained according to one of Claims 10 to 12.
EP01969862A 2000-09-11 2001-09-10 Security sheet comprising a transparent or translucent layer Expired - Lifetime EP1319104B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FR0011543A FR2814476B1 (en) 2000-09-11 2000-09-11 SAFETY SHEET HAVING A TRANSPARENT OR TRANSLUCENT LAYER
FR0011543 2000-09-11
PCT/FR2001/002803 WO2002020902A1 (en) 2000-09-11 2001-09-10 Security sheet comprising a transparent or translucent layer

Publications (2)

Publication Number Publication Date
EP1319104A1 EP1319104A1 (en) 2003-06-18
EP1319104B1 true EP1319104B1 (en) 2007-10-31

Family

ID=8854157

Family Applications (1)

Application Number Title Priority Date Filing Date
EP01969862A Expired - Lifetime EP1319104B1 (en) 2000-09-11 2001-09-10 Security sheet comprising a transparent or translucent layer

Country Status (18)

Country Link
US (1) US8658273B2 (en)
EP (1) EP1319104B1 (en)
CN (1) CN1245555C (en)
AT (1) ATE377110T1 (en)
AU (1) AU2001289996A1 (en)
BR (1) BR0113796B1 (en)
CA (1) CA2421984C (en)
CZ (1) CZ301138B6 (en)
DE (1) DE60131180T2 (en)
DK (1) DK1319104T3 (en)
ES (1) ES2295209T3 (en)
FR (1) FR2814476B1 (en)
HU (1) HU229559B1 (en)
PL (1) PL213020B1 (en)
PT (1) PT1319104E (en)
SK (1) SK287883B6 (en)
TW (1) TWI296663B (en)
WO (1) WO2002020902A1 (en)

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EP2466005B1 (en) 2006-10-27 2017-10-04 Crane & Co., Inc. A soil and/or moisture resistant secure document

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JP4854690B2 (en) * 2007-09-21 2012-01-18 ソニーケミカル＆インフォメーションデバイス株式会社 Magnetic sheet and manufacturing method thereof
US7828922B2 (en) 2007-10-24 2010-11-09 Neenah Paper, Inc. Methods for making false watermarks in a fibrous substrate
JP5311159B2 (en) * 2008-10-03 2013-10-09 シクパ ホルディング ソシエテ アノニム Optically changing security elements
FR2945180B1 (en) 2009-05-07 2013-02-22 Arjowiggins Security INFORMATION CARRIER HAVING ANTIVIRAL PROPERTIES AND METHOD FOR MANUFACTURING THE SAME
DE102009020846A1 (en) * 2009-05-12 2010-11-25 Giesecke & Devrient Gmbh Ink receiving layer with recess
FR2954211B1 (en) 2009-12-23 2012-02-17 Arjowiggins Security METHOD OF MANUFACTURING SHEET BY DENSIFICATION TO FORM A TRANSPARENT RENDERED AREA.
FR2960005B1 (en) 2010-05-12 2012-07-20 Arjowiggins Security SECURITY DOCUMENT COMPRISING A WATERMARK OR PSEUDO-WATERMARK, A COMBINED IMAGE AND A REVELATION FRAME, AND ASSOCIATED METHODS.
FR2965752B1 (en) 2010-10-08 2012-11-30 Arjowiggins Security SECURITY STRUCTURE INCORPORATING MICROPERFORATIONS
FR2965750A1 (en) 2010-10-08 2012-04-13 Arjowiggins Security MULTILAYER STRUCTURE
FR2967074B1 (en) 2010-11-08 2013-06-28 Arjowiggins Security FLUID COMPOSITIONS CAPABLE OF FORMING A COATING HAVING ANTIVIRAL PROPERTIES
US9708773B2 (en) * 2011-02-23 2017-07-18 Crane & Co., Inc. Security sheet or document having one or more enhanced watermarks
FR2973049B1 (en) 2011-03-21 2016-12-23 Arjowiggins Security INFORMATION OR PAPER HOLDER HAVING A SELF-REPAIRING MATERIAL
FR2975408B1 (en) 2011-05-18 2020-10-23 Arjowiggins Security HIGH DURABILITY SHEET FOR BANK NOTE MANUFACTURING
FR2980395A1 (en) 2011-09-23 2013-03-29 Arjowiggins Security SHEET SUPPORT
FR2984926B1 (en) 2011-12-21 2014-02-21 Arjowiggins Security COLOR RESISTANT PAPER SHEET
AP2014007865A0 (en) * 2012-02-29 2014-08-31 Scipa Holding Sa Permanent staining of varnished security documents
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US10275969B2 (en) 2012-03-09 2019-04-30 United States Postal Service Method and system for item authentication and customization
DE202012010037U1 (en) 2012-10-19 2014-01-20 Hueck Folien Ges.M.B.H. Coating for securities, in particular for increasing the fitness for circulation
FR2998588B1 (en) 2012-11-29 2015-01-30 Arjowiggins Security FACTOR RESISTANT SAFETY SHEET, PROCESS FOR PRODUCING THE SAME, AND SAFETY DOCUMENT COMPRISING THE SAME.
FR2999618B1 (en) 2012-12-19 2015-03-20 Arjowiggins Security METHOD OF PREPARING A SECURITY AND / OR VALUE SHEET BY PENETRATION OF A THERMOACTIVABLE ADHESIVE WITHIN A FIBROUS SUBSTRATE.
FR3004470B1 (en) 2013-04-11 2015-05-22 Arjowiggins Security SECURITY ELEMENT COMPRISING AN INTERFERENTIAL PIGMENT AND A NANOMETRIC LOAD.
FR3004471B1 (en) * 2013-04-11 2015-10-23 Arjowiggins Security SECURITY ELEMENT COMPRISING A MASKING STRUCTURE CONTAINING A MIXTURE OF NANOMETER CHARGES.
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EP2466005B1 (en) 2006-10-27 2017-10-04 Crane & Co., Inc. A soil and/or moisture resistant secure document
EP3231938B1 (en) 2006-10-27 2021-08-04 Crane & Co., Inc. A soil and/or moisture resistant secure document

Also Published As

Publication number Publication date
ATE377110T1 (en) 2007-11-15
US20040023008A1 (en) 2004-02-05
CA2421984C (en) 2010-01-12
PL361145A1 (en) 2004-09-20
BR0113796B1 (en) 2012-10-30
AU2001289996A1 (en) 2002-03-22
CZ2003607A3 (en) 2004-12-15
SK2712003A3 (en) 2006-06-01
EP1319104A1 (en) 2003-06-18
PL213020B1 (en) 2012-12-31
HU229559B1 (en) 2014-02-28
CN1245555C (en) 2006-03-15
SK287883B6 (en) 2012-02-03
FR2814476B1 (en) 2003-04-11
DE60131180T2 (en) 2008-08-07
TWI296663B (en) 2008-05-11
CZ301138B6 (en) 2009-11-18
CA2421984A1 (en) 2002-03-14
ES2295209T3 (en) 2008-04-16
HUP0301682A2 (en) 2003-08-28
PT1319104E (en) 2008-02-06
BR0113796A (en) 2003-07-08
DE60131180D1 (en) 2007-12-13
US8658273B2 (en) 2014-02-25
CN1455833A (en) 2003-11-12
FR2814476A1 (en) 2002-03-29
WO2002020902A1 (en) 2002-03-14
DK1319104T3 (en) 2008-03-03

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