WO1988002137A1 - Document treating method for hindering the photocopying reproduction, and products for implementing such method - Google Patents

Document treating method for hindering the photocopying reproduction, and products for implementing such method Download PDF

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Publication number
WO1988002137A1
WO1988002137A1 PCT/FR1987/000358 FR8700358W WO8802137A1 WO 1988002137 A1 WO1988002137 A1 WO 1988002137A1 FR 8700358 W FR8700358 W FR 8700358W WO 8802137 A1 WO8802137 A1 WO 8802137A1
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Prior art keywords
band
doping material
document
light
photoluminescent materials
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PCT/FR1987/000358
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French (fr)
Inventor
Philippe Gravisse
Claude Bernardi
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Philippe Gravisse
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Publication of WO1988002137A1 publication Critical patent/WO1988002137A1/en

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    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G21/00—Arrangements not provided for by groups G03G13/00 - G03G19/00, e.g. cleaning, elimination of residual charge
    • G03G21/04—Preventing copies being made of an original
    • G03G21/043—Preventing copies being made of an original by using an original which is not reproducible or only reproducible with a different appearence, e.g. originals with a photochromic layer or a colour background
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03C—PHOTOSENSITIVE MATERIALS FOR PHOTOGRAPHIC PURPOSES; PHOTOGRAPHIC PROCESSES, e.g. CINE, X-RAY, COLOUR, STEREO-PHOTOGRAPHIC PROCESSES; AUXILIARY PROCESSES IN PHOTOGRAPHY
    • G03C5/00—Photographic processes or agents therefor; Regeneration of such processing agents
    • G03C5/08—Photoprinting; Processes and means for preventing photoprinting

Definitions

  • the present invention relates to a document processing method in particular in the form of sheets of paper or plastic printed in order to make their reproduction by photocopy recognizable from the original document.
  • Many commercial, industrial or fiduciary documents have a high confidentiality and / or significant legal value: notarial acts, confidential reports, certificates and attestations, official titles, ...
  • the present invention relates to a document processing method intended to make them non-copiable or at least recognizable from their reproduction by photocopying avoiding such drawbacks.
  • the method according to the invention consists in treating the surface of the document with a transparent matrix comprising at least two photoluminescent materials absorbing the incident light radiation in a first wavelength band determined.
  • the spectral response curve of the photocopier depends on the one hand on the spectral curve of the light source of the document to be reproduced, on the other hand on the spectral curve of the photosensitive layer.
  • the response curve differs significantly from the spectral perception curve of the human eye, and it is this difference that the present invention proposes to exploit.
  • Color photocopying uses the same principle and involves three or four rolls for each of the primary colors.
  • the subject of the present invention is a method of processing a document with a matrix containing at least one photoluminescent dopant, the absorption range of which corresponds to a range of high sensitivity of the photocopier, and the re-emission range, to a range of low sensitivity of the copier, with a view to greatly reducing the contrast of the copy, or the absorption range of which corresponds to a range of low sensitivity of the copier, and the range of re-transmission to a range of saturation of the copier, in order to saturate the photocopier's photosensitive sensor and obtain a copy that is too clear.
  • Photoluminescent materials form "light cascades".
  • a matrix is deposited on the surface of the document containing at least one light cascade absorbing the radiation from the light source of the photocopier in the part of the spectrum close to ultraviolet and reemitting radiation of greater wavelength in a spectral band for which the photoconductive layer has a low sensitivity. This causes a significant disturbance in reproduction and the photocopy obtained is very difficult to read.
  • a matrix is deposited on the surface of the document containing a first light cascade according to the embodiment described in the preferred mode, as well as at least one other light cascade having an absorption band in the visible spectrum and a retransmission band in a longer wavelength range of the visible spectrum and intended to modify the background color of the document obtained by color photocopying.
  • a matrix is deposited on the surface of the document containing a pair of light cascades chosen in such a way that the re-emission lengths form, for the chromaticity curve of the eye, a complementary bichromic couple and that the ratio of the concentrations of each of the light cascades is substantially equal to the chromaticity ratio of their remission.
  • This document thus treated appears white to the human eye but due to the non-linearity of the response from color photocopiers, the reproduction will be strongly colored.
  • a triplet of light cascades is chosen, the remission bands of which form a complementary three-color triplet for the chromaticity curve of the eye, their respective concentrations being proportional to their chromatic weight.
  • the matrix containing the light cascades is applied to the document to be treated by spraying or by coating.
  • the matrix constitutes a self-adhesive transparent film.
  • FIG. 1 represents a schematic section of a document treated according to the invention.
  • FIG. 1 shows a document consisting of a conventional support (1) such as a sheet of paper comprising inscriptions (2) produced in particular by printing with ink or any other known means.
  • the document is covered with a transparent matrix (3) comprising dopants (4) forming light cascades.
  • the light cascades (4) absorb the incident radiation (5) in a band of variable wavelength according to the type of light cascade and re-emits radiation (6) in a band of different and generally longer wavelength.
  • the incident radiation (7) can also be absorbed by dark areas of the document, in particular by the inscriptions (2) if the document is produced in dark printing on a light background.
  • the radiation diffused by the processed document and picked up by the photocopier will be different from that which would have been diffused by the unprocessed document and induce disturbances in reproduction.
  • two series of dopants are used, the remission wavelengths of which are complementary for the perception curve of the human eye.
  • the human eye perceives electromagnetic radiation with wavelengths between 3800 ⁇ and 7800 ⁇ , and the perception of a color can be represented in a polar system by a vector of angle g and length L. At each length wave corresponds to a perception vector. It is possible to establish a table specifying the angle g and the length L of the polar vector for all the wavelengths of the visible spectrum, for which the human eye will have the same perception.
  • Two wavelengths are said to be complementary if their corresponding angles are substantially opposite, that is to say different by about 180 °.
  • the human eye will have a balanced white impression if the respective concentration of each of the dopants is inversely proportional to the chromaticity L corresponding to the re-emission wavelength.
  • the doping materials used for implementing the method according to the invention are generally cyclic aromatic materials containing several nuclei, preferably between 3 and 15. These photoluminescent materials are known in themselves and distributed commercially. The following bodies may be cited by way of non-limiting example:
  • UVITEX OB a complex of molecules marketed by the company CIBA GEIGY, under the name of UVITEX OB,
  • the doped matrix has a transmissibility greater than or equal to 70%.
  • the photoluminescent materials are introduced into the matrix in a known manner, by diffusion or by grafting.
  • the matrix is made of a resin and will advantageously be made of acrylic material, polyester, polyurethane or polyvinyl chloride.
  • the matrix can also be made of a plastic material known under the name of P.M.M.A. (Polymethylmetacrylate) in the form of a self-adhesive film.
  • Example 1 the products for the implementation of the invention have been produced such as: Example 1:
  • a product containing several dopants in homogeneous dispersion in an acrylic binder is produced in the following concentrations:
  • the document treated by coating or by spraying using an aerosol can with the doped matrix according to this example takes a very light pastel coloring.
  • Reproduction using a neir and white photocopier has an almost uniformly gray appearance, the very low residual contrast.
  • Reproduction by a color photocopier takes an orange-red tint that varies depending on the type of photocopier.
  • the concentrations are deduced from the light perception table.
  • the matrix consists of a mat polyester film with a thickness of 2 to 8 ⁇ m covered with an adhesive on one of its faces.
  • the dopants are introduced by grafting according to known techniques and in the concentrations indicated in the previous examples.
  • the matrix can also be constituted by the very support of the document.
  • a support was produced comprising on a sheet of paper a layer of doped matt polyester as indicated in the previous examples.
  • a deposit with a thickness of between 5 and 10 ⁇ m will be produced.
  • the paper thus obtained can be used for printing by all conventional means such as printing, photocopying, etc. It can also be used for manuscripts.
  • the invention is not limited to the examples and embodiments shown and described here and many modifications can be made without departing from the scope of the invention.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Paper (AREA)
  • Printing Methods (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)

Abstract

The disclosed method comprises the treatment of a document surface with a transparent matrix (3) having dispersed therein photoluminescent materials (4). According to a first embodiment, said photoluminescent materials (4) form a luminous cascade absorbing the incident light radiation and re-emitting said radiation in a wavelength band of low sensitivity for photocopying machines. According to another embodiment, said photoluminescent materials (4) form a complementary couple for the eye chromaticity curve. The protection of a document may be carried out by coating or spraying a doped matrix (3) or by printing on a pretreated paper.

Description

Procédé de traitement de documents destiné à perturber la reproduction par photocopie et produits pour la mise en oeuyre de ce procédé Process for processing documents intended to disrupt reproduction by photocopying and products for implementing this process
La présente invention concerne un procédé de traitement de documents notamment sous forme de feuilles de papier ou de plastique imprimés en vue de rendre leur reproduction par photocopie reconnaissable du document original. De nombreux documents commerciaux, industriels ou fiduciaires présentent un caractère de haute confidentialité et/ou une valeur juridique importante: actes notariés, rapports confidentiels, certificats et attestations, titres officiels, ...The present invention relates to a document processing method in particular in the form of sheets of paper or plastic printed in order to make their reproduction by photocopy recognizable from the original document. Many commercial, industrial or fiduciary documents have a high confidentiality and / or significant legal value: notarial acts, confidential reports, certificates and attestations, official titles, ...
Les moyens de reproduction actuels tels la photocopie, et notamment la photocopie couleur, permettent de réaliser des copies de la plupart des documents avec une qualité telle qu'il devient très difficile voire impossible de reconnaitre la copie de l'original.Current means of reproduction such as photocopying, and in particular color photocopying, make it possible to make copies of most documents with a quality such that it becomes very difficult if not impossible to recognize the copy of the original.
Cela entraine dans certains cas une insécurité juridique et autorise toute sorte de fraudes et d'abus pouvant léser l'autorité et les intérêts de la personne morale ou physique dont émane le document original et peut porter préjudice à un tiers à qui il est transmis une reproduction frauduleuse au lieu du document original.This leads in some cases to legal uncertainty and authorizes all kinds of fraud and abuse which could harm the authority and the interests of the legal or natural person from which the original document emanates and can be prejudicial to a third party to whom it is transmitted. fraudulent reproduction in place of the original document.
On a proposé dans l'art antérieur diverses solutions.Various solutions have been proposed in the prior art.
On peut notamment citer le choix de certains couples de couleurs pour le papier et l'encre d'impression tels que la réponse du senseur de la photocopieuse noir et blanc soit le même pour chacune des couleurs et traduisent donc par un même niveau de gris le fond et le texte imprimé. Le contraste est ainsi notablement diminué au point de rendre la photocopie inutilisable. Ceci est notamment réalisé par impression à l'encre bleue sur fond jaune ou encre noire sur fond rouge.We can notably cite the choice of certain pairs of colors for the paper and the printing ink such that the response of the sensor of the black and white photocopier is the same for each of the colors and therefore translate by the same gray level. background and printed text. The contrast is thus notably reduced to the point of rendering the photocopy unusable. This is achieved in particular by printing in blue ink on a yellow background or black ink on a red background.
Cette solution présente plusieurs inconvénients. Outre une présentation inhabituelle et inesthétique et la possiblité dé faire une reproduction identique à l'original par photocopie couleur, on peut reproduire de tels documents à l'aide d'une photocopieuse noir et blanc en insérant un filtre transparent, ayant la même couleur que le fond du document, entre le document et la glace d'exposition. On augmente alors suffisamment le contraste pour rendre la photocopie lisible.This solution has several drawbacks. In addition to an unusual and unsightly presentation and the possibility of making a reproduction identical to the original by color photocopy, one can reproduce such documents using a black and white photocopier by inserting a transparent filter, having the same color as the bottom of the document, between the document and the document glass. The contrast is then increased enough to make the photocopy readable.
La présente invention a pour objet un procédé de traitement de documents destiné à les rendre non copiables ou au moins reconnaissables de leur reproduction par photocopie évitant de tels inconvénients.The present invention relates to a document processing method intended to make them non-copiable or at least recognizable from their reproduction by photocopying avoiding such drawbacks.
Le procédé selon l'invention consiste à traiter la surface du document avec une matrice transparente comportant au moins deux matières photoluminescentes absorbant le rayonnement lumineux incident dans une première bande de longueurs d'onde déterminée.The method according to the invention consists in treating the surface of the document with a transparent matrix comprising at least two photoluminescent materials absorbing the incident light radiation in a first wavelength band determined.
De telles cascades lumineuses sont connues et déjà décrites dans les brevets français Nº 7609321 et N° 8116678 du demandeur. Le principe de la photocopie par électrocopie est la suivante : dans l'obscurité, un tambour recouvert d'une mince coubhe de semi-conducteurs est balayé par une grille conductrice portée à une tension élevée. Cette grille communique des charges électrostatiques à la couche semi-conductrice devenue photosensible. L'image du document original placé sur la glace d'exposition est projetée par l'intermédiaire d'un objectif sur cette couche photosensible. Lès zones atteintes par la lumière perdent leurs charges électriques tandis que celles restées dans l'ombre les conservent. On a alors sur le tambour une copie invisible du document sous forme de charges positives. En tournant sur un axe, le tambour attire ensuite les poudres d'encre chargées négativement sur les zones chargées.Such light cascades are known and already described in the French patents Nº 7609321 and N ° 8116678 of the applicant. The principle of photocopying by electrocopying is as follows: in the dark, a drum covered with a thin layer of semiconductors is swept by a conductive grid brought to a high voltage. This grid communicates electrostatic charges to the semiconductor layer which has become photosensitive. The image of the original document placed on the document glass is projected via a lens onto this photosensitive layer. Areas affected by light lose their electrical charges while those that remain in the shade keep them. We then have on the drum an invisible copy of the document in the form of positive charges. By turning on an axis, the drum then attracts the negatively charged ink powders on the charged areas.
Ces charges seront ensuite déposées sur une feuille de papier faiblement chargéepositivement et fixées par des moyens connus, notamment par chauffage.These charges will then be deposited on a sheet of paper lightly positively charged and fixed by known means, in particular by heating.
La courbe de réponse spectrale du photocopieur dépend d'une part de la courbe spectrale de la source d'éclairage du document à reproduire, d'autre part de la courbe spectrale de la couche photosensible.The spectral response curve of the photocopier depends on the one hand on the spectral curve of the light source of the document to be reproduced, on the other hand on the spectral curve of the photosensitive layer.
Compte tenu des phénomènes physiques intervenant dans la reproduction d'un document, la courbe de réponse diffère sensiblement de la courbe de perception spectrale de l'oeil humain, et c'est cette différence que la présente invention se propose d'exploiter.Given the physical phenomena involved in the reproduction of a document, the response curve differs significantly from the spectral perception curve of the human eye, and it is this difference that the present invention proposes to exploit.
La photocopie couleur utilise le même principe et met en jeu trois ou quatre rouleaux pour chacune des couleurs primaires.Color photocopying uses the same principle and involves three or four rolls for each of the primary colors.
La présente invention a pour objet un procédé de traitement d'un document par une matrice contenant au moins un dopant photoluminescent, dont la plage d'absorption correspond à une plage de forte sensibilité du photocopieur, et la plage de réémission, à une plage de faible sensibilité du photocopieur, en vue de diminuer très fortement le contraste de la copie, ou dont la plage d'absorption correspond à une plage de faible sensibilité du photocopieur, et la plage de réémission à une plage de saturation du photocopieur, dans le but de saturer le capteur photosensible du photocopieur et d'obtenir une copie trop claire.The subject of the present invention is a method of processing a document with a matrix containing at least one photoluminescent dopant, the absorption range of which corresponds to a range of high sensitivity of the photocopier, and the re-emission range, to a range of low sensitivity of the copier, with a view to greatly reducing the contrast of the copy, or the absorption range of which corresponds to a range of low sensitivity of the copier, and the range of re-transmission to a range of saturation of the copier, in order to saturate the photocopier's photosensitive sensor and obtain a copy that is too clear.
Les matières photoluminescentes forment des"cascades lumineuses". Selon un mode de réalisation préféré de la présente invention, on dépose à la surface du document une matrice contenant au moins une cascade lumineuse absorbant le rayonnement de la source lumineuse de la photocopieuse dans la partie du spectre proche de l'ultra-violet et réemettant un rayonnement de longueur d'ondes supérieur dans une bande spectrale pour laquelle la couche photoconductrice présente une faible sensibilité. On provoque ainsi une perturbation importante de la reproduction et la photocopie obtenue est très peu lisible.Photoluminescent materials form "light cascades". According to a preferred embodiment of the present invention, a matrix is deposited on the surface of the document containing at least one light cascade absorbing the radiation from the light source of the photocopier in the part of the spectrum close to ultraviolet and reemitting radiation of greater wavelength in a spectral band for which the photoconductive layer has a low sensitivity. This causes a significant disturbance in reproduction and the photocopy obtained is very difficult to read.
Selon un autre mode de réalisation, on dépose à la surface du document une matrice contenant une première cascade lumineuse selon la réalisation décrite dans le mode préféré, ainsi qu'au moins une autre cascade lumineuse présentant une bande d'absorbtion dans le spectre visible et une bande de réemission dans une plage de longueur d'ondes supérieure du spectre visible et destinée à modifier la couleur de fond du document obtenu par photocopie couleur.According to another embodiment, a matrix is deposited on the surface of the document containing a first light cascade according to the embodiment described in the preferred mode, as well as at least one other light cascade having an absorption band in the visible spectrum and a retransmission band in a longer wavelength range of the visible spectrum and intended to modify the background color of the document obtained by color photocopying.
Selon un troisième mode de réalisation, on dépose à la surface du document une matrice contenant un couple de cascades lumineuses choisi de telle manière que les longueurs de réemission forment, pour la courbe de chromaticité de l'oeil, un couple bichromique complémentaire et que le rapport des concentrations de chacune des cascades lumineuses soit sensiblement égal au rapport de chromaticité de leur réemission. Ce document ainsi traité apparaît blanc pour l'oeil humain mais du fait de la non linéarité de la réponse des photocopieuses couleur la reproduction sera fortement colorée. Selon une variante de ce mode de réalisation, on choisit un triplet de cascades lumineuses dont les bandes de réemission forment un triplet trichromique complémentaire pour la courbe de chromaticité de l'oeil, leurs concentrations respectives étant proportionnelles à leur poids chromatique.According to a third embodiment, a matrix is deposited on the surface of the document containing a pair of light cascades chosen in such a way that the re-emission lengths form, for the chromaticity curve of the eye, a complementary bichromic couple and that the ratio of the concentrations of each of the light cascades is substantially equal to the chromaticity ratio of their remission. This document thus treated appears white to the human eye but due to the non-linearity of the response from color photocopiers, the reproduction will be strongly colored. According to a variant of this embodiment, a triplet of light cascades is chosen, the remission bands of which form a complementary three-color triplet for the chromaticity curve of the eye, their respective concentrations being proportional to their chromatic weight.
Selon un mode de mise en oeuvre préféré du procédé et selon l'invention, la matrice contenant les cascades lumineuses est appliquée sur le document à traiter par pulvérisation ou par enduction.According to a preferred embodiment of the method and according to the invention, the matrix containing the light cascades is applied to the document to be treated by spraying or by coating.
Selon une variante, la matrice constitue un film transparent autoadhésif.According to a variant, the matrix constitutes a self-adhesive transparent film.
Selon un autre mode de réalisation, la matrice constitue un support pouvant être imprimé par des moyens d'imprimerie classique. D'autres formes de réalisation et avantages ressortiront mieux de la description qui va suivre : la figure 1 représente une coupe shématique d'un document traité selon l'invention. La figure 1 montre un document constitué d'un support classique(1) tel qu'une feuille de papier comportant des inscriptions (2) réalisées notamment par impression à l'encre ou tout autre moyen connu. Le document est recouvert d'une matrice transparente (3) comportant des dopants (4) formant des cascades lumineuses. Les cascades lumineuses (4) absorbent le rayonnement incident (5) dans une bande de longueur d'ondes variable selon le type de cascade lumineuse et réemet un rayonnement (6) dans une bande de longueur d'ondes différente et généralement supérieure. Le rayonnement incident (7) peut également être absorbé par des zones sombres du document, notamment par les inscriptions (2) si le document est réalisé en impression sombre sur fond clair. Il en résulte que le rayonnement diffusé par le document traité et capté par la photocopieuse sera différent de celui qui aurait été diffusé par le document non traité et induire des perturbations dans la reproduction.According to another embodiment, the matrix constitutes a support which can be printed by conventional printing means. Other embodiments and advantages will emerge more clearly from the description which follows: FIG. 1 represents a schematic section of a document treated according to the invention. FIG. 1 shows a document consisting of a conventional support (1) such as a sheet of paper comprising inscriptions (2) produced in particular by printing with ink or any other known means. The document is covered with a transparent matrix (3) comprising dopants (4) forming light cascades. The light cascades (4) absorb the incident radiation (5) in a band of variable wavelength according to the type of light cascade and re-emits radiation (6) in a band of different and generally longer wavelength. The incident radiation (7) can also be absorbed by dark areas of the document, in particular by the inscriptions (2) if the document is produced in dark printing on a light background. As a result, the radiation diffused by the processed document and picked up by the photocopier will be different from that which would have been diffused by the unprocessed document and induce disturbances in reproduction.
Selon une variante, on utilise deux séries de dopants dont les longueurs d'ondes de réémission sont complémentaires pour la courbe de perception de l'oeil humain. L'oeil humain perçoit les radiations électromagnétiques de longueurs d'ondes comprises entre 3800 Å et 7800 Å, et la perception d'une couleur peut être représentée dans un système polaire par un vecteur d'angle g et de longueur L. A chaque longueur d'onde correspond un vecteur de perception. Il est possible d'établir un tableau précisant l'angle g et la longueur L du vecteur polaire pour l'ensemble des longueurs d'ondes du spectre visible, pour lesquels l'oeil humain aura une même perception. According to a variant, two series of dopants are used, the remission wavelengths of which are complementary for the perception curve of the human eye. The human eye perceives electromagnetic radiation with wavelengths between 3800 Å and 7800 Å, and the perception of a color can be represented in a polar system by a vector of angle g and length L. At each length wave corresponds to a perception vector. It is possible to establish a table specifying the angle g and the length L of the polar vector for all the wavelengths of the visible spectrum, for which the human eye will have the same perception.
Figure imgf000007_0001
Deux longueurs d'onde sont dites complémentaires si leurs angles correspondant sont sensiblement opposés, c'est-à-dire différents d'environ 180°.
Figure imgf000007_0001
Two wavelengths are said to be complementary if their corresponding angles are substantially opposite, that is to say different by about 180 °.
L'oeil humain aura une impression de blanc équilibré si la concentration respective de chacun des dopants est inversement proportionnelle à la chromaticité L correspondant à la longueur d'onde de réémission.The human eye will have a balanced white impression if the respective concentration of each of the dopants is inversely proportional to the chromaticity L corresponding to the re-emission wavelength.
Les matières de dopage employées pour la mise en oeuvre du procédé selon l'invention sont d'une manière générale des matières aromatiques cycliques contenant plusieurs noyaux, de préférence entre 3 et 15. Ces matières photoluminescentes sont connues par elles-mêmes et distribuées commercialement. On peut citer les corps suivants à titre d'exemple non limitatif :The doping materials used for implementing the method according to the invention are generally cyclic aromatic materials containing several nuclei, preferably between 3 and 15. These photoluminescent materials are known in themselves and distributed commercially. The following bodies may be cited by way of non-limiting example:
- le 4-DICYANOMETHYLENE-2-METHYL-6-(p-DIMETHYLAMINOSTYRYL)-4H-PYRAN, en abrégé DMC, - la RHODAMINE 700, nom commercial du composé C26H26N205C1F3,- 4-DICYANOMETHYLENE-2-METHYL-6- (p-DIMETHYLAMINOSTYRYL) -4H-PYRAN, abbreviated DMC, - RHODAMINE 700, trade name of compound C 26 H 26 N 205 C 1 F 3 ,
- le DIPHENYLOXAZOL commercialisé sous le nom de PPO,- DIPHENYLOXAZOL marketed under the name of PPO,
- un complexe de molécules commercialisé par la Société CIBA GEIGY, sous le nom de UVITEX OB,- a complex of molecules marketed by the company CIBA GEIGY, under the name of UVITEX OB,
- le COUMARIN 102, - la SULFORHODAMINE 101,- COUMARIN 102, - SULFORHODAMINE 101,
- le COUMARIN 120,- the COUMARIN 120,
- le COUMARIN 500,- the COUMARIN 500,
- la RHODAMINE 110,- RHODAMINE 110,
- le diméthylformylstyril benzooxazine, en abrégé DFS BO. La matrice dopée présente une transmissibilité supérieure ou égale à 70 %. Les matières photoluminescentes sont introduites dans la matrice de manière connue, par diffusion ou par greffage.- dimethylformylstyril benzooxazine, abbreviated to DFS BO. The doped matrix has a transmissibility greater than or equal to 70%. The photoluminescent materials are introduced into the matrix in a known manner, by diffusion or by grafting.
La matrice est constituée d'une résine et sera avantageusement constituée de matière acrylique, de polyester, de polyuréthane ou de chlorure de polyvinyl. La matrice peut aussi être réalisée en une matière plastique connue sour le nom de P.M.M.A. (Polyméthylmetacrylate) dans la réalisation sous forme de film auto-adhésif.The matrix is made of a resin and will advantageously be made of acrylic material, polyester, polyurethane or polyvinyl chloride. The matrix can also be made of a plastic material known under the name of P.M.M.A. (Polymethylmetacrylate) in the form of a self-adhesive film.
On a par exemple réalisé les produits pour la mise en oeuvre de l'invention tels que : Exemple 1 :For example, the products for the implementation of the invention have been produced such as: Example 1:
On réalise un produit contenant plusieurs dopants en dispersion homogène dans un liant acrylique dans les concentrations suivantes :
Figure imgf000009_0001
A product containing several dopants in homogeneous dispersion in an acrylic binder is produced in the following concentrations:
Figure imgf000009_0001
Le document traité par l'enduction ou par pulvérisation à l'aide d'une bombe aérosol avec la matrice dopée selon cet exemple prend une coloration pastel très légère. La reproduction à l'aide d'une photocopieuse neir et blanc présente un aspect presque uniformément gris, le contraste résiduel éteint très faible.The document treated by coating or by spraying using an aerosol can with the doped matrix according to this example takes a very light pastel coloring. Reproduction using a neir and white photocopier has an almost uniformly gray appearance, the very low residual contrast.
La reproduction à l'aide d'une photocopieuse couleur prend une forte coloration jaunâtre, cette coloration variant selon les caractéristiques de la photocopieuse employée. Exemple 2 :Reproduction using a color photocopier takes on a strong yellowish coloring, this coloring varying according to the characteristics of the photocopier used. Example 2:
Figure imgf000009_0002
Figure imgf000009_0002
La reproduction par une photocopieuse couleur prend une teinte rouge orangée variable selon le type de photocopieuse.Reproduction by a color photocopier takes an orange-red tint that varies depending on the type of photocopier.
L'aspect du document traité présente une légère coloration pastel. Exemple 3 :The appearance of the processed document has a slight pastel color. Example 3:
Figure imgf000009_0003
Figure imgf000009_0003
Les concentrations sont déduites du tableau de perception lumineuse.The concentrations are deduced from the light perception table.
Les deux longueurs d'ondes de réémission forment un couple bichromique complémentaire. Le document traité par enduction du produit ainsi préparé ne présente pas de coloration sensible. La reproduction par photocopie couleur présente une coloration verte marquée. Exemple 4 :The two re-emission wavelengths form a complementary two-color pair. The document treated by coating the product thus prepared does not exhibit any significant coloration. Reproduction by color photocopy has a marked green color. Example 4:
Figure imgf000010_0001
La reproduction par photocopie couleur présente une coloration jaune verte marquée. Exemple 5 :
Figure imgf000010_0001
Reproduction by color photocopy has a marked yellow green coloration. Example 5:
La matrice est constituée d'un film de polyester mat d'une épaisseur de 2 à 8μm recouvert d'un adhésif sur l'une de ses faces. Les dopants sont introduits par greffage selon des techniques connues et dans les concentrations indiquées dans les exemples précédents. Exemple 6 :The matrix consists of a mat polyester film with a thickness of 2 to 8 μm covered with an adhesive on one of its faces. The dopants are introduced by grafting according to known techniques and in the concentrations indicated in the previous examples. Example 6:
La matrice peut également être constituée par le support même du document. On a réalisé un support comportant sur une feuille de papier une couche de polyester mat dopée comme indiqué dans les exemples précédents. On réalisera avantageusement un dépôt d'une épaisseur comprise entre 5 et 10μm. Le papier ainsi obtenu peut servir à l'impression par tous les moyens classiques tels qu'imprimerie, photocopie, etc. Il peut également servir pour des manuscrits. Bien entendu, l'invention n'est pas limitée aux exemples et modes de réalisation représentés et décrits ici et on peut y apporter de nombreuses modifications sans pour cela sortir du cadre de l'invention. The matrix can also be constituted by the very support of the document. A support was produced comprising on a sheet of paper a layer of doped matt polyester as indicated in the previous examples. Advantageously, a deposit with a thickness of between 5 and 10 μm will be produced. The paper thus obtained can be used for printing by all conventional means such as printing, photocopying, etc. It can also be used for manuscripts. Of course, the invention is not limited to the examples and embodiments shown and described here and many modifications can be made without departing from the scope of the invention.

Claims

REVENDICATIONS
1) Procédé de préparation d'un document destiné à perturber sa reproduction par photocopie caractérisé en ce que l'on recouvre la surface dudit document d'une matrice transparente comportant au moins deux matières photoluminescentes absorbant le rayonnement lumineux incident dans une première bande de longueurs d'onde déterminée.1) Process for preparing a document intended to disturb its reproduction by photocopying, characterized in that the surface of said document is covered with a transparent matrix comprising at least two photoluminescent materials absorbing the incident light radiation in a first strip of lengths wave.
2) Procédé selon la revendication 1 caractérisé en ce que les matières photoluminescentes forment au oins une cascade lumineuse.2) Method according to claim 1 characterized in that the photoluminescent materials at least form a light cascade.
3) Procédé selon la revendication 3 caractérisé en ce que la bande de longueurs d'onde d'absorption de la cascade lumineuse correspond à une bande de forte sensibilité des photocopieurs, et que la bande de réemission de la cascade lumineuse correspond à une bande de faible sensibilité des photocopieurs.3) Method according to claim 3 characterized in that the absorption wavelength band of the light cascade corresponds to a band of high sensitivity of photocopiers, and that the remission band of the light cascade corresponds to a band of low sensitivity of photocopiers.
4) Procédé selon la revendication 3 caractérisé en ce que la bande de longueurs d'onde d'absorption de la cascade lumineuse correspond à une bande de faible sensibilité des photocopieurs, et que la bande de réémission de la cascade lumineuse correspond à une bande de saturation des photocopieurs.4) Method according to claim 3 characterized in that the absorption wavelength band of the light cascade corresponds to a low sensitivity band of photocopiers, and that the re-emission band of the light cascade corresponds to a band of saturation of photocopiers.
5) Procédé selon la revendication 2 caractérisé en ce que la longueur d'onde d'absorption de la cascade lumineuse est inférieure à 4000 Å et que la longueur d'onde de réémission de ladite cascade lumineuse est supérieure à 6000 Å .5) Method according to claim 2 characterized in that the absorption wavelength of the light cascade is less than 4000 Å and that the re-emission wavelength of said light cascade is greater than 6000 Å.
6) Procédé selon la revendication 5 caractérisé en ce que ladite matrice organique comporte au moins les trois corps suivants :6) Method according to claim 5 characterized in that said organic matrix comprises at least the following three bodies:
1ère matière de dopage DIPHENYLOXAZOL 2ème matière de dopage UVITEX OB (CIBA GEIBY)1st doping material DIPHENYLOXAZOL 2nd doping material UVITEX OB (CIBA GEIBY)
3ème matière de dopage RHODAMINE 7003rd RHODAMINE 700 doping material
7) Procédé selon la revendication 6 caractérisé en ce que ladite matrice organique comporte une quatrième matière de dopage, le DCM.7) Method according to claim 6 characterized in that said organic matrix comprises a fourth doping material, DCM.
8) Procédé selon la revendication 1 caractérisé en ce que les longueurs d'onde de réémission des matières photoluminescentes forment un couple complémentaire pour la courbe de chromaticité de l'oeil humain et que les concentrations desdites matières photoluminescentes sont proportionnelles à leur chromaticité.8) Method according to claim 1 characterized in that the re-emission wavelengths of photoluminescent materials form a complementary torque for the chromaticity curve of the human eye and that the concentrations of said photoluminescent materials are proportional to their chromaticity.
9) Procédé selon la revendication 8 caractérisé en ce que ladite matrice organique comporte le couple de dopants :9) Method according to claim 8 characterized in that said organic matrix includes the pair of dopants:
1ère matière de dopage : COUMARIN 1021st doping material: COUMARIN 102
2ème matière de dopage : SULFORHODAMINE dans un rapport de concentration de 1,61105/0,88842. 10) Procédé selon la revendication 8 caractérisé en ce que ladite matrice organique comporte le couple de dopants : 1ère matière de dopage : COUMARIN 5002nd doping material: SULFORHODAMINE in a concentration ratio of 1.61105 / 0.8842. 10) Method according to claim 8 characterized in that said organic matrix comprises the pair of dopants: 1st doping material: COUMARIN 500
2ème matière de dopage DFS BO dans un rapport de concentration de 3,064/1,133. 11) Procédé selon l'une quelconque des revendications 1 à 10 caractérisé en ce que la matrice est constituée d'une résine acrylique.2nd DFS BO doping material in a concentration ratio of 3.064 / 1.133. 11) Method according to any one of claims 1 to 10 characterized in that the matrix consists of an acrylic resin.
12) Produit d'enduction pour la mise en oeuvre de l'une quelconque des revendications 1 à 11.12) coating product for the implementation of any one of claims 1 to 11.
13) Produit pulverisable à l'aide d'une bombe aérosol pour la mise en oeuvre de l'une quelconque des revendications 1 à 11.13) Product sprayable using an aerosol can for the implementation of any one of claims 1 to 11.
14) Papier non photocopiable comportant un support en papier ordinaire recouvert d'une matrice dopée selon l'une quelconque des revendications 1 à 11. 14) Non-photocopiable paper comprising an ordinary paper support covered with a doped matrix according to any one of claims 1 to 11.
PCT/FR1987/000358 1986-09-15 1987-09-15 Document treating method for hindering the photocopying reproduction, and products for implementing such method WO1988002137A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR86/12872 1986-09-15
FR8612872A FR2603918B1 (en) 1986-09-15 1986-09-15 DOCUMENT PROCESSING METHOD FOR DISTURBING PHOTOCOPY REPRODUCTION AND PRODUCTS FOR CARRYING OUT SAID METHOD

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3713861A (en) * 1969-12-04 1973-01-30 Xerox Corp Inhibitor device
GB1466102A (en) * 1975-01-13 1977-03-02 Rue Co Ltd T De Production of security documents

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3713861A (en) * 1969-12-04 1973-01-30 Xerox Corp Inhibitor device
GB1466102A (en) * 1975-01-13 1977-03-02 Rue Co Ltd T De Production of security documents

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FR2603918B1 (en) 1988-11-25
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