EP0494828B1 - Safety document - Google Patents
Safety document Download PDFInfo
- Publication number
- EP0494828B1 EP0494828B1 EP19920400058 EP92400058A EP0494828B1 EP 0494828 B1 EP0494828 B1 EP 0494828B1 EP 19920400058 EP19920400058 EP 19920400058 EP 92400058 A EP92400058 A EP 92400058A EP 0494828 B1 EP0494828 B1 EP 0494828B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- agent
- fact
- aqueous solution
- sodium sulphite
- action
- 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
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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
- D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
- D21H17/03—Non-macromolecular organic compounds
- D21H17/05—Non-macromolecular organic compounds containing elements other than carbon and hydrogen only
- D21H17/06—Alcohols; Phenols; Ethers; Aldehydes; Ketones; Acetals; Ketals
-
- 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
- D21H21/44—Latent security elements, i.e. detectable or becoming apparent only by use of special verification or tampering devices or methods
- D21H21/46—Elements suited for chemical verification or impeding chemical tampering, e.g. by use of eradicators
Definitions
- the invention relates to a security document which cannot be forged by sodium sulfite.
- Such documents can be used as bank checks, traveller's checks, titles, notarial acts, etc., for which it is essential to guard against any falsification by sodium sulfite of the writings or stamps carried on these documents.
- the ink erasing pencils contain sodium sulfite in an alkaline medium, their pH is of the order of 10.
- This alkaline character is used to reveal the falsification by incorporating in mass or on the surface of the document a colored indicator which turns well visibly at a pH of 9.5-10.
- a clearly visible coloration is obtained at a pH of 9.5-10, red with phenolphthalein as described in patent FR-A-2,365,656; a blue coloration is obtained with the AS check dye sold by the company BASF.
- the object of the invention is to provide a security document which cannot be forged by sodium sulfite and which comprises at least one agent sensitive to bases to develop a coloring, this agent betraying adulteration by sulfite and which can be chosen from a wide range of compounds in order to be able to choose a color revealing falsification which is well contrasted with the color of the final document.
- the object of the invention can be achieved by incorporating in mass and / or on the surface of the document, at least one alkalinity-generating compound under the action of a saturated solution of sodium sulfite. This compound then increases the pH of the document during the attempt at falsification and there follows a colored reaction with the agent sensitive to bases.
- the agent sensitive to bases can be a colored indicator or an agent sensitive to strong bases such as, for example, manganese chloride.
- R can be any, a carbon chain, saturated or not, linear or branched, contain heteroatoms, one or more rings, heterocycles, aromatic rings.
- Dialdehydes rather than monoaldehydes are preferably used because they generate twice as much alkalinity.
- alkalinity-generating compounds indirectly comprising at least one aldehyde function or at least one ketone function. These compounds are considered to be alkalinity generators according to the invention.
- these may be compounds commonly used as microbicides and which generate formaldehyde; in particular, they may be compounds comprising the methylol group -CH2OH such as hemiformals, sulfur-containing compounds S-methylol or nitrogen compounds N-methylol.
- the invention therefore more particularly provides a document which is characterized in that the alkalinity generator is a compound comprising directly or indirectly at least one aldehyde function or at least one ketone function.
- non-volatile compounds and / or compounds having substantial properties towards the material (for example cellulose) constituting the document to be secured are selected.
- the compounds are chosen which do not have an unpleasant odor and which are well soluble in water so that their use is simple and to avoid the problems associated with organic solvents (toxicity, risks of explosion. ..).
- aldehyde salycilic aldehyde or a dialdehyde such as glutaric aldehyde can be used in particular.
- These aldehydes are perfectly compatible with the other falsification agents reactive with solvents, with redox agents such as that described in the patent of the Applicant FR-A-2,580,303, with chlorinated products (bleach).
- the invention more particularly provides a document containing by mass as a colored indicator the dye for AS check sold by BASF and comprising on the surface of glutaraldehyde so that it develops a blue coloration under the action of a saturated aqueous solution. in sodium sulfite.
- the invention more particularly provides a document comprising on the surface as a colored indicator of phenolphthalein and also comprising on the surface of glutaraldehyde so that it develops a red coloration under the action of an aqueous solution saturated with sodium sulfite .
- the invention more particularly provides a document comprising on the surface as an agent sensitive to strong bases of manganese chloride and comprising on the surface of glutaraldehyde so that it develops a brown coloration under the action of a saturated aqueous solution in sodium sulfite.
- the security document according to the invention can in particular be obtained by the papermaking route from a purely cellulosic fibrous composition or containing synthetic fibers, and optionally containing mineral fillers, dyes and other adjuvants usually used in stationery.
- the document may therefore include other agents reactive to chemical falsifications compatible with the alkalinity generator; it can also include physical authentication agents such as watermarks, security threads, boards, fluorescent fibers, iridescent pigments, etc.
- the alkalinity-generating compound can be incorporated en masse during the production of the document. It can also be placed on the surface of the document by coating, printing or impregnating with a size press of the document with a composition containing said compound and a binder and optionally the agent sensitive to bases.
- alkalinity-generating compounds and of agents sensitive to bases will be adjusted by the skilled person according to the intensity of the desired coloring, according to the sensitivity of the compounds and reagent reactive to bases, and also so as not to significantly change the color of the document.
- a sheet is made by papermaking from a cellulosic fibrous composition and possibly other adjuvants.
- This sheet is dried.
- a sheet is made by papermaking from a cellulosic fibrous composition and possibly other adjuvants.
- This sheet is dried.
- the whiteness is 70-85 photovolts.
- a sheet is produced by the papermaking route from a cellulosic fibrous composition to which 0.02 to 0.5% is added on a dry basis relative to the fibrous composition of a colored indicator, the dye for check AS marketed by BASF, and possibly other adjuvants.
- the quantity deposited is approximately 40 g / m2 in dry.
- This sheet is dried.
- a sheet is made by papermaking from a cellulosic fibrous composition and possibly other adjuvants.
- This sheet is dried.
- a sheet is made by papermaking from a cellulosic fibrous composition and possibly other adjuvants.
- This sheet is dried.
- a sheet is made by papermaking from a cellulosic fibrous composition and possibly other adjuvants.
- This sheet is dried.
Description
L'invention concerne un document de sécurité infalsifiable, par le sulfite de sodium.The invention relates to a security document which cannot be forged by sodium sulfite.
De tels documents peuvent être utilisés comme chèques bancaires, chèques de voyage, titres, actes notariés, etc... pour lesquels il est indispensable de se prémunir contre toute falsification par le sulfite de sodium des écritures ou cachets portés sur ces documents.Such documents can be used as bank checks, traveller's checks, titles, notarial acts, etc., for which it is essential to guard against any falsification by sodium sulfite of the writings or stamps carried on these documents.
Des documents infalsifiables par les crayons effaceurs ont été décrits par exemple dans les brevets FR-A-2 365 656, FR-A-2 399 505 et son certificat d'addition FR-E-2 402 739 de la demanderesse.Documents that cannot be forged by erasers are described, for example, in patents FR-A-2 365 656, FR-A-2 399 505 and its certificate of addition FR-E-2 402 739 by the applicant.
Les crayons effaceurs d'encre contiennent du sulfite de sodium en milieu alcalin, leur pH est de l'ordre de 10. On utilise ce caractère alcalin pour révéler la falsification en incorporant en masse ou à la surface du document un indicateur coloré qui vire bien visiblement à un pH de 9,5-10. Par exemple, on obtient une coloration bien visible à un pH de 9,5-10, en rouge avec la phénolphtaléine comme décrit dans le brevet FR-A-2 365 656; on obtient une coloration bleue avec le colorant pour chèque AS vendu par la société BASF.The ink erasing pencils contain sodium sulfite in an alkaline medium, their pH is of the order of 10. This alkaline character is used to reveal the falsification by incorporating in mass or on the surface of the document a colored indicator which turns well visibly at a pH of 9.5-10. For example, a clearly visible coloration is obtained at a pH of 9.5-10, red with phenolphthalein as described in patent FR-A-2,365,656; a blue coloration is obtained with the AS check dye sold by the company BASF.
Cependant si l'on tente d'effacer une écriture portée par exemple avec une encre pour stylo plume en utilisant une solution aqueuse saturée en sulfite de sodium, la falsification n'est pas révélée avec les indicateurs colorés précédents. En effet, une telle solution saturée a un pH de 9, donc un pH inférieur à celui donnant un virage bien visible de l'indicateur coloré.However, if an attempt is made to erase a writing worn for example with an ink for a fountain pen using an aqueous solution saturated with sodium sulfite, the falsification is not revealed with the preceding colored indicators. Indeed, such a saturated solution has a pH of 9, therefore a pH lower than that giving a clearly visible shift in the colored indicator.
Dans la demande de brevet FR-A-2 647 820, on a décrit des documents de sécurité infalsifiables contenant des produits comme le rutin trihydrate ou le narigin hydrate qui donnent une réaction jaune avec les crayons effaceurs ou les bases, de la 1,8 dihydroxyanthraquinone qui donne une réaction orangé-rouge avec les crayons effaceurs et rouge avec les bases; le pH permettant d'avoir une coloration bien visible n'est pas précisé. Un inconvénient de cette invention est son emploi de produits très particuliers.In patent application FR-A-2 647 820, tamper-proof security documents have been described containing products such as rutin trihydrate or narigin hydrate which give a yellow reaction with erasers or bases, from 1.8 dihydroxyanthraquinone which gives an orange-red reaction with the erasers and red with the bases; the pH allowing a clearly visible coloration is not specified. A disadvantage of this invention is its use of very specific products.
Dans les brevets FR-A-2 406 027, FR-A-2 427 426 et le certificat d'addition FR-E-2 432 576 on a décrit des documents de sécurité infalsifiables par agent chimique et contenant des nitrophénols. Le paranitrophénol a une zone de virage suffisamment large pour réagir à la fois au crayon effaceur et à une solution saturée en sulfite de sodium en développant une coloration jaune. Il sera cependant difficile d'observer une telle couleur si le document a pour couleur de fond le jaune ou une couleur peu contrastante avec le jaune.In patents FR-A-2 406 027, FR-A-2 427 426 and the certificate of addition FR-E-2 432 576, security documents which cannot be forged by agent have been described. chemical and containing nitrophenols. Paranitrophenol has a sufficiently wide turning zone to react both with the eraser and with a saturated solution of sodium sulfite, developing a yellow coloration. However, it will be difficult to observe such a color if the document has a background color of yellow or a color that has little contrast with yellow.
Le but de l'invention est de fournir un document de sécurité infalsifiable par le sulfite de sodium et comportant au moins un agent sensible aux bases pour développer une coloration, cet agent trahissant la falsification par le sulfite et pouvant être choisi parmi une large gamme de composés afin de pouvoir choisir une coloration révélatrice de la falsification qui soit bien contrastée avec la couleur du document final.The object of the invention is to provide a security document which cannot be forged by sodium sulfite and which comprises at least one agent sensitive to bases to develop a coloring, this agent betraying adulteration by sulfite and which can be chosen from a wide range of compounds in order to be able to choose a color revealing falsification which is well contrasted with the color of the final document.
La demanderesse a découvert que le but de l'invention peut être atteint en incorporant en masse et/ou à la surface du document, au moins un composé générateur d'alcalinité sous l'action d'une solution saturée en sulfite de sodium. Ce composé augmente alors le pH du document lors de la tentative de falsification et il s'ensuit une réaction colorée avec l'agent sensible aux bases.The Applicant has discovered that the object of the invention can be achieved by incorporating in mass and / or on the surface of the document, at least one alkalinity-generating compound under the action of a saturated solution of sodium sulfite. This compound then increases the pH of the document during the attempt at falsification and there follows a colored reaction with the agent sensitive to bases.
L'agent sensible aux bases peut être un indicateur coloré ou un agent sensible aux bases fortes comme par exemple le chlorure de manganèse.The agent sensitive to bases can be a colored indicator or an agent sensitive to strong bases such as, for example, manganese chloride.
Comme composés générateurs d'alcalinité sous l'action d'une solution saturée en sulfite de sodium, on utilise plus particulièrement les composés comportant au moins une fonction aldéhyde.As compounds which generate alkalinity under the action of a saturated solution of sodium sulfite, use is more particularly made of compounds comprising at least one aldehyde function.
En effet ces composés libèrent de l'hydroxyde de sodium en milieu aqueux selon le schéma réactionnel suivant:
R-COH + H₂O + Na₂SO₃ ----> NaOH + R-CH(SO₃Na)OH
R peut être quelconque, une chaîne carbonée, saturée ou non, linéaire ou ramifiée, comporter des hétéroatomes, un ou plusieurs cycles, hétérocycles, noyaux aromatiques.In fact, these compounds release sodium hydroxide in an aqueous medium according to the following reaction scheme:
R-COH + H₂O + Na₂SO₃ ----> NaOH + R-CH (SO₃Na) OH
R can be any, a carbon chain, saturated or not, linear or branched, contain heteroatoms, one or more rings, heterocycles, aromatic rings.
On utilise de préférence les dialdéhydes aux monoaldéhydes car ils génèrent deux fois plus d'alcalinité.Dialdehydes rather than monoaldehydes are preferably used because they generate twice as much alkalinity.
Comme autres composés générateurs d'alcalinité sous l'action d'une solution saturée en sulfite de sodium, on peut utiliser les composés comportant au moins une fonction cétone.As other compounds which generate alkalinity under the action of a saturated solution of sodium sulfite, it is possible to use the compounds comprising at least one ketone function.
Des essais faits par la Demanderesse ont montré que les cétones ayant une chaine carbonée linéaire et ayant au plus cinq carbone donnent les meilleurs résultats.Tests carried out by the Applicant have shown that ketones having a linear carbon chain and having at most five carbon give the best results.
On peut également utiliser des composés générateurs d'alcalinité comportant indirectement au moins une fonction aldéhyde ou au moins une fonction cétone. Ces composés sont considérés comme des générateurs d'alcalinité conformément à l'invention.It is also possible to use alkalinity-generating compounds indirectly comprising at least one aldehyde function or at least one ketone function. These compounds are considered to be alkalinity generators according to the invention.
Par exemple, il peut s'agir de composés utilisés habituellement comme microbicides et qui génèrent du formaldéhyde; en particulier il peut s'agir de composés comportant le groupement méthylol -CH₂OH comme les hémiformals, les composés soufrés S-méthylol ou les composés azotés N-méthylol.For example, these may be compounds commonly used as microbicides and which generate formaldehyde; in particular, they may be compounds comprising the methylol group -CH₂OH such as hemiformals, sulfur-containing compounds S-methylol or nitrogen compounds N-methylol.
L'invention fournit donc plus particulièrement un document qui se caractérise par le fait que le générateur d'alcalinité est un composé comportant directement ou indirectement au moins une fonction aldéhyde ou au moins une fonction cétone.The invention therefore more particularly provides a document which is characterized in that the alkalinity generator is a compound comprising directly or indirectly at least one aldehyde function or at least one ketone function.
On sélectionne de préférence des composés non volatils et/ou présentant des propriétés de substantivité envers la matière (par exemple la cellulose) constituant le document à sécuriser.Preferably, non-volatile compounds and / or compounds having substantial properties towards the material (for example cellulose) constituting the document to be secured are selected.
On choisit de préférence les composés qui n'ont pas d'odeur désagréable et qui sont bien solubles dans l'eau afin que leur mise en oeuvre soit simple et d'éviter les problèmes liés aux solvants organiques (toxicité, risques d'explosion ...).Preferably, the compounds are chosen which do not have an unpleasant odor and which are well soluble in water so that their use is simple and to avoid the problems associated with organic solvents (toxicity, risks of explosion. ..).
L'homme du métier choisira ces composés de façon à ce qu'ils soient compatibles avec les autres agents d'infalsification chimique retenus.Those skilled in the art will choose these compounds so that they are compatible with the other retained chemical forging agents.
Comme aldéhyde on peut utiliser en particulier l'aldéhyde salycilique ou un dialdéhyde comme l'aldéhyde glutarique. Ces aldéhydes sont parfaitement compatibles avec les autres agents d'infalsification réactifs aux solvants, aux oxydo-réducteurs comme celui décrit dans le brevet de la Demanderesse FR-A-2 580 303, aux produits chlorés (eau de javel).As aldehyde, salycilic aldehyde or a dialdehyde such as glutaric aldehyde can be used in particular. These aldehydes are perfectly compatible with the other falsification agents reactive with solvents, with redox agents such as that described in the patent of the Applicant FR-A-2,580,303, with chlorinated products (bleach).
L'invention fournit plus particulièrement un document contenant en masse comme indicateur coloré le colorant pour chèque AS vendu par BASF et comportant en surface de l'aldéhyde glutarique de sorte qu'il développe une coloration bleue sous l'action d'une solution aqueuse saturée en sulfite de sodium.The invention more particularly provides a document containing by mass as a colored indicator the dye for AS check sold by BASF and comprising on the surface of glutaraldehyde so that it develops a blue coloration under the action of a saturated aqueous solution. in sodium sulfite.
L'invention fournit plus particulièrement un document comportant en surface comme indicateur coloré de la phénolphtaléine et comportant également en surface de l'aldéhyde glutarique de sorte qu'il développe une coloration rouge sous l'action d'une solution aqueuse saturée en sulfite de sodium.The invention more particularly provides a document comprising on the surface as a colored indicator of phenolphthalein and also comprising on the surface of glutaraldehyde so that it develops a red coloration under the action of an aqueous solution saturated with sodium sulfite .
L'invention fournit plus particulièrement un document comportant en surface comme agent sensible aux bases fortes du chlorure de manganèse et comportant en surface de l'aldéhyde glutarique de sorte qu'il développe une coloration marron sous l'action d'une solution aqueuse saturée en sulfite de sodium.The invention more particularly provides a document comprising on the surface as an agent sensitive to strong bases of manganese chloride and comprising on the surface of glutaraldehyde so that it develops a brown coloration under the action of a saturated aqueous solution in sodium sulfite.
Le document de sécurité selon l'invention peut être en particulier obtenu par voie papetière à partir d'une composition fibreuse purement cellulosique ou contenant des fibres synthétiques, et contenant éventuellement des charges minérales, des colorants et autres adjuvants utilisés habituellement en papeterie.The security document according to the invention can in particular be obtained by the papermaking route from a purely cellulosic fibrous composition or containing synthetic fibers, and optionally containing mineral fillers, dyes and other adjuvants usually used in stationery.
Le document peut donc comporter d'autres agents réactifs aux infalsifications chimiques compatibles avec le générateur d'alcalinité; il peut aussi comporter des agents physiques d'authentification comme les filigranes, fils de sécurité, planchettes, fibres fluorescentes, pigments iridescents etc... .The document may therefore include other agents reactive to chemical falsifications compatible with the alkalinity generator; it can also include physical authentication agents such as watermarks, security threads, boards, fluorescent fibers, iridescent pigments, etc.
Le composé générateur d'alcalinité peut être incorporé en masse lors de la fabrication du document. Il peut aussi être mis à la surface du document en réalisant un couchage, une impression ou une imprégnation avec une presse encolleuse du document par une composition contenant ledit composé et un liant et éventuellement l'agent sensible aux bases.The alkalinity-generating compound can be incorporated en masse during the production of the document. It can also be placed on the surface of the document by coating, printing or impregnating with a size press of the document with a composition containing said compound and a binder and optionally the agent sensitive to bases.
Les quantités de composés générateurs d'alcalinité et d'agents sensibles aux bases seront réglées par l'Homme du métier selon l'intensité de la coloration souhaitée, selon la sensibilité des composés et agent réactif aux bases, et également de façon à ne pas altérer notablement la teinte du document.The amounts of alkalinity-generating compounds and of agents sensitive to bases will be adjusted by the skilled person according to the intensity of the desired coloring, according to the sensitivity of the compounds and reagent reactive to bases, and also so as not to significantly change the color of the document.
L'invention vise aussi à fournir une composition destinée à rendre un document infalsifiable par le sulfite de sodium ayant pour caractéristique le fait qu'elle contient:
- au moins un composé générateur d'alcalinité sous l'action du sulfite de sodium en solution aqueuse saturée,
- au moins un agent sensible aux bases fortes pour développer une coloration et/ou un indicateur coloré,
- au moins un liant habituellement utilisé en papeterie.
- at least one alkalinity-generating compound under the action of sodium sulfite in saturated aqueous solution,
- at least one agent sensitive to strong bases for developing a coloration and / or a colored indicator,
- at least one binder usually used in stationery.
L' invention fournit en particulier une composition ayant pour caractéristique le fait qu'elle contient :
- au moins un composé générateur d'alcalinité sous l'action du sulfite de sodium en solution aqueuse saturée, choisi parmi les composés comportant directement ou indirectement au moins une fonction aldéhyde ou au moins une fonction cétone,
- au moins un agent sensible aux bases fortes pour développer une coloration et/ou un indicateur coloré,
- au moins un liant habituellement utilisé en papeterie.
- at least one alkalinity-generating compound under the action of sodium sulfite in saturated aqueous solution, chosen from compounds comprising directly or indirectly at least one aldehyde function or at least one ketone function,
- at least one agent sensitive to strong bases for developing a coloration and / or a colored indicator,
- at least one binder usually used in stationery.
Les exemples non limitatifs suivants permettront de mieux comprendre l'invention:The following nonlimiting examples will allow a better understanding of the invention:
On réalise une feuille par voie papetière à partir d'une composition fibreuse cellulosique et éventuellement d'autres adjuvants.A sheet is made by papermaking from a cellulosic fibrous composition and possibly other adjuvants.
On imprègne cette feuille avec une composition aqueuse contenant, en sec:
- 2 à 15 parties d'un liant (amidon par exemple)
- 0,05 à 2 parties d'un indicateur coloré ,la phénolphtaléine.
- 2 to 15 parts of a binder (starch for example)
- 0.05 to 2 parts of a colored indicator, phenolphthalein.
On sèche cette feuille.This sheet is dried.
Si l'on essaie de falsifier le document obtenu à l'aide d'un crayon effaceur, il se développe une coloration rouge.If you try to falsify the document obtained using an eraser, a red color develops.
Si l'on essaie de le falsifier avec une solution aqueuse saturée en sulfite de sodium, il ne se développe aucune coloration notable à l'oeil nu.If one tries to falsify it with a saturated aqueous solution of sodium sulfite, it does not develop any noticeable coloration with the naked eye.
On réalise une feuille par voie papetière à partir d'une composition fibreuse cellulosique et éventuellement d'autres adjuvants.A sheet is made by papermaking from a cellulosic fibrous composition and possibly other adjuvants.
On imprègne cette feuille avec une composition aqueuse contenant, en sec:
- 2 à 15 parties d'un liant (amidon par exemple)
- 0,05 à 2 parties d'un indicateur coloré ,la phénolphtaléine
- 0,5 à 4 parties d'un composé générateur d'alcalinité , l'aldéhyde glutarique .
- 2 to 15 parts of a binder (starch for example)
- 0.05 to 2 parts of a colored indicator, phenolphthalein
- 0.5 to 4 parts of an alkalinity-generating compound, glutaric aldehyde.
On sèche cette feuille.This sheet is dried.
Si l'on essaie de falsifier le document obtenu à l'aide d'un crayon effaceur , il se développe une coloration rouge.
Si l'on essaie de le falsifier avec une solution aqueuse saturée en sulfite de sodium, il se développe également une coloration rouge parfaitement visible à l'oeil nu.If you try to falsify the document obtained using an eraser, a red color develops.
If we try to falsify it with a saturated aqueous solution of sodium sulfite, it also develops a red coloration perfectly visible to the naked eye.
De plus la teinte du papier n'est pas modifiée, la blancheur est de 70-85 photovolts.In addition the tint of the paper is not changed, the whiteness is 70-85 photovolts.
On réalise une feuille par voie papetière à partir d'une composition fibreuse cellulosique à laquelle on ajoute 0,02 à 0,5 % en sec par rapport à la composition fibreuse d'un indicateur coloré, le colorant pour chèque AS commercialisé par BASF, et éventuellement d'autres adjuvants.A sheet is produced by the papermaking route from a cellulosic fibrous composition to which 0.02 to 0.5% is added on a dry basis relative to the fibrous composition of a colored indicator, the dye for check AS marketed by BASF, and possibly other adjuvants.
On imprègne cette feuille avec une composition aqueuse contenant, en sec:
- 2 à 15 parties d'un liant (amidon par exemple)
- 0,5 à 4 parties d'un composé générateur d'alcalinité , l'aldéhyde glutarique.
- 2 to 15 parts of a binder (starch for example)
- 0.5 to 4 parts of an alkalinity-generating compound, glutaric aldehyde.
La quantité déposée est d'environ 40 g/m² en sec.The quantity deposited is approximately 40 g / m² in dry.
On sèche cette feuille.This sheet is dried.
Si l'on essaie de falsifier le document obtenu à l'aide d'un crayon effaceur, il se développe une coloration bleue.If you try to falsify the document obtained using an eraser, a blue color develops.
Si l'on essaie de le falsifier avec une solution aqueuse saturée en sulfite de sodium, il se développe également une coloration bleue parfaitement visible à l'oeil nu.If one tries to falsify it with a saturated aqueous solution of sodium sulfite, it also develops a blue coloration perfectly visible to the naked eye.
On réalise une feuille par voie papetière à partir d'une composition fibreuse cellulosique et éventuellement d'autres adjuvants.A sheet is made by papermaking from a cellulosic fibrous composition and possibly other adjuvants.
On imprègne cette feuille avec une composition aqueuse contenant ,en sec
- 2 à 15 parties d'un liant (amidon par exemple),
- 0,05 à 4 parties d'un agent sensible aux bases, le chlorure de manganèse,
- 0,5 à 4 parties d'un composé générateur d'alcalinité ,l'aldéhyde glutarique.
- 2 to 15 parts of a binder (starch for example),
- 0.05 to 4 parts of a base-sensitive agent, manganese chloride,
- 0.5 to 4 parts of an alkalinity-generating compound, glutaric aldehyde.
On sèche cette feuille .This sheet is dried.
Si l'on essaie de le falsifier avec une solution aqueuse saturée en sulfite de sodium, il se développe une coloration marron parfaitement visible à l'oeil nu.If we try to falsify it with a saturated aqueous solution of sodium sulfite, it develops a brown color that is perfectly visible to the naked eye.
On réalise une feuille par voie papetière à partir d'une composition fibreuse cellulosique et éventuellement d'autres adjuvants.A sheet is made by papermaking from a cellulosic fibrous composition and possibly other adjuvants.
On imprègne cette feuille avec une composition aqueuse contenant, en sec:
- 2 à 15 parties d'un liant (amidon par exemple)
- 0,05 à 2 parties d'un indicateur coloré ,la phénolphtaléine
- 0,5 à 4 parties d'un composé générateur d'alcalinité, la méthyl éthylcétone.
- 2 to 15 parts of a binder (starch for example)
- 0.05 to 2 parts of a colored indicator, phenolphthalein
- 0.5 to 4 parts of an alkalinity-generating compound, methyl ethyl ketone.
On sèche cette feuille.This sheet is dried.
Si l'on essaie de falsifier le document obtenu à l'aide d'un crayon effaceur, il se développe une coloration rouge.If you try to falsify the document obtained using an eraser, a red color develops.
Si l'on essaie de le falsifier avec une solution aqueuse saturée en sulfite de sodium, il se développe également une coloration rouge parfaitement visible à l'oeil nu.If we try to falsify it with a saturated aqueous solution of sodium sulfite, it also develops a red color that is perfectly visible to the naked eye.
On réalise une feuille par voie papetière à partir d'une composition fibreuse cellulosique et éventuellement d'autres adjuvants.A sheet is made by papermaking from a cellulosic fibrous composition and possibly other adjuvants.
On imprègne cette feuille avec une composition aqueuse contenant ,en sec:
- 2 à 15 parties d'un liant (amidon par exemple)
- 0,05 à 2 parties d'un indicateur coloré ,la phénolphtaléine
- 0,5 à 4 parties d'un composé générateur d'alcalinité comportant indirectement la fonction aldéhyde: l'alcool benzylique mono(poly)hémiformal, commercialisé sous le nom de PREVENTOL D2 par BAYER.
- 2 to 15 parts of a binder (starch for example)
- 0.05 to 2 parts of a colored indicator, phenolphthalein
- 0.5 to 4 parts of an alkalinity-generating compound indirectly comprising the aldehyde function: mono (poly) hemiformal benzyl alcohol, marketed under the name of PREVENTOL D2 by BAYER.
On sèche cette feuille.This sheet is dried.
Si l'on essaie de falsifier le document obtenu à l'aide d'un crayon effaceur, il se développe une coloration rouge.If you try to falsify the document obtained using an eraser, a red color develops.
Si l'on essaie de le falsifier avec une solution aqueuse saturée en sulfite de sodium, il se développe également une coloration rouge parfaitement visible à l'oeil nu.If we try to falsify it with a saturated aqueous solution of sodium sulfite, it also develops a red color that is perfectly visible to the naked eye.
Claims (11)
- Security document non-falsifiable by sodium sulphite, comprising at least one agent sensitive to bases for developing a coloration, characterized by the fact that it comprises, on the surface or throungh the mass at least one compound generating alkalinity under the action of sodium sulphite in saturated aqueous solution.
- Document according to claim 1, characterized by the fact that the alkalinity-generating compound is a compound comprising directly or indirectly at least one aldehyde function and at least one ketone function.
- Document according to claim 2, characterized by the fact that the aldehyde compound is a dialdehyde.
- Document according to claim 3, characterized by the fact that the dialdehyde is glutaraldehyde.
- Document according to claim 2, characterized by the fact that the aldehyde compound is salicylaldehyde.
- Document according to claim 2, characterized by the fact that the alkalinity-inducing compound which indirectly comprises an aldehyde function is selected from hemiformals, sulphurous S-methylol compounds or nitrogenous N-methylol compounds.
- Document according to claim 4, which contains through the mass as agent sensitive to bases, the coloring agent for checks called AS sold by BASF, and which comprises glutaraldehyde on the surface, so that it develops a blue coloration under the action of a sodium sulphite saturated aqueous solution.
- Document according to claim 4, which comprises phenolphtaleine on the surface as agent sensitive to bases, and further comprises glutaraldehyde on the surface so that it develops a red coloration under the action of a sodium sulphite saturated aqueous solution.
- Document according to claim 4, which comprises manganese chloride on the surface as agent sensitive to strong bases, and also comprises glutaraldehyde on the surface, so that it develops a brown coloration under the action of a sodium sulphite saturated aqueous solution.
- Composition intended for rendering a document non-falsifiable by sodium sulphite, characterized by the fact that it contains:- at least one agent inducing alkalinity under the action of sodium sulphite in saturated aqueous solution, which agent is selected according to one of claims 2 to 8,- at least one agent sensitive to strong bases for developing a coloration and/or one color indicator,- at least one binding agent normally used in the papermaking industry.
- Composition according to claim 10, characterized by the fact that it contains :- at least one compouund inducing alkalinity under the action of sodium sulphite in saturated aqueous solution, selected according to one of claims 2 to 8,- at least one agent sensitive to strong bases for developing a coloration and/or a color indicator,- at least one binding agent normally used in the papermaking industry.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR9100311A FR2671566B1 (en) | 1991-01-11 | 1991-01-11 | SAFETY DOCUMENT INFALSIFIABLE BY A CHEMICAL AGENT. |
| FR9100311 | 1991-01-11 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0494828A1 EP0494828A1 (en) | 1992-07-15 |
| EP0494828B1 true EP0494828B1 (en) | 1995-04-19 |
Family
ID=9408627
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP19920400058 Expired - Lifetime EP0494828B1 (en) | 1991-01-11 | 1992-01-10 | Safety document |
Country Status (2)
| Country | Link |
|---|---|
| EP (1) | EP0494828B1 (en) |
| FR (1) | FR2671566B1 (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10020873A1 (en) * | 2000-04-28 | 2001-11-08 | Mitsubishi Hitec Paper Flensbu | Temporary authentification mark for security documents uses a substituted phthalide reacting on contact with an alkaline solution, together with a volatile solvent |
| FR2943074B1 (en) * | 2009-03-13 | 2011-05-20 | Arjowiggins Security | LASER MARKABLE SUBSTRATE AND METHOD FOR MANUFACTURING THE SAME |
| FR2970716B1 (en) | 2011-01-25 | 2013-09-06 | Honnorat Rech S & Services | SAFETY PAPER INFALSIFIABLE TO SOLVENTS |
| FR2981955B1 (en) | 2011-10-26 | 2013-11-01 | Honnorat Rech S & Services | SAFETY PAPER INFALSIFIABLE TO OXYDO-REDUCING AGENTS |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2399505A1 (en) * | 1976-05-25 | 1979-03-02 | Arjomari Prioux | Security paper for prepn. of official documents etc. - is coated with or contains oxy:pyrene-tri:sulphonic acid or a salt of the acid |
| FR2365656A1 (en) * | 1976-05-25 | 1978-04-21 | Arjomari Prioux | SECURITY PAPER |
-
1991
- 1991-01-11 FR FR9100311A patent/FR2671566B1/en not_active Expired - Fee Related
-
1992
- 1992-01-10 EP EP19920400058 patent/EP0494828B1/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| FR2671566A1 (en) | 1992-07-17 |
| FR2671566B1 (en) | 1993-04-09 |
| EP0494828A1 (en) | 1992-07-15 |
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