EP0184529B1 - Forgery-proof impression-writing support - Google Patents
Forgery-proof impression-writing support Download PDFInfo
- Publication number
- EP0184529B1 EP0184529B1 EP85420214A EP85420214A EP0184529B1 EP 0184529 B1 EP0184529 B1 EP 0184529B1 EP 85420214 A EP85420214 A EP 85420214A EP 85420214 A EP85420214 A EP 85420214A EP 0184529 B1 EP0184529 B1 EP 0184529B1
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- EP
- European Patent Office
- Prior art keywords
- support
- products
- support according
- substrate
- inorganic
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- 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.)
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
- B41M3/00—Printing processes to produce particular kinds of printed work, e.g. patterns
- B41M3/14—Security printing
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- 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 present invention relates to the problem posed by the risk of falsification attached to the use of a ballpoint pen with ink erasable by erasing or scraping.
- ballpoint pen inks are mainly composed of mineral pigments with remarkable stability and unassailable properties.
- these inks have the disadvantage of not easily lending themselves to corrections, unless using aggressive technical means which leave an indelible mark or mark on the written medium.
- the ink can be considered to include, in its composition, a first type of rapid solvent used to immediately hang the colored pigments on the support, so as to establish a material fixation on the support.
- the ink also contains a second solvent which can be described as slow and whose evaporation leads to the intimate bond between the binders of the colored pigments and the surface layer of the support. As long as the second solvent is not completely evaporated, the colored pigments can be erased by rubbing, such as scraping or, more particularly, scrubbing.
- a ballpoint pen loaded with an ink of the above type allows successive corrections for a given period of time and facilitates, for example, the execution of documents or printed matter of a current character.
- German application DE-A-29 51 486 proposes, in this sense, the incorporation into the constituent mass of the print-write support, of microencapsulated dyes and of an acid silicate acceptor of dyes. Under the pressure generated by the tip of a pen used to write on such a support, the capsules are punctured and release the dye which reacts with the acid silicate to form a trace in the mass of the support.
- any attempt at falsification to eliminate the trace of the ink specific to the ballpoint pen, lets appear the internal mark on the paper which then represents the physical trace of an attempt at falsification. If such an attempt is made by means of an eraser strongly supported on the support, the locally exerted pressure develops, over the entire surface concerned, a mark further increasing the proof of attempted falsification.
- European patent application 0 029 714 proposes using, by coating on a print-write support, a film of adsorbent products, electron acceptors, such as a silica gel or a reactive kaolin.
- French patent application FR-A-2 483 480 relates to a security paper comprising on the surface micro-capsules containing an ink solvent of the type of that taught by American patent 4 097 290.
- the micro-capsules punctured when applying pressure from the tip of the pen, release the solvent they contain which dilutes at least part of the pen ink and carries inorganic pigments into the surface layer.
- a paper or print-writing medium, produced according to this technique is relatively high cost, taking into account the need to micro-encapsulate the solvent responsible for the subsequent dilution of the ink.
- any pressure applied to the print-write support for example during handling, storage or manufacture, also leads to the rupture of the micro-capsules which release the solvent in the absence of ink. , since in these pre-use phases, such documents were not impressed or written.
- the colored mark is affixed on an area or surface whose microcapsules have already been punctured.
- the function of these microcapsules can no longer intervene, since the solvent is already diluted or evaporated.
- FR-A-2 491 968 offers a security paper associated in bulk or on the surface with microcapsules containing a solvent to dissolve the dye used for registration.
- the present invention aims to provide a solution to the problem thus posed by the existence of inks and stylobilles of the type described in US Pat. No. 4,097,290, by proposing a support eliminating any possibility of erasing the ink immediately after filing.
- Another object of the invention is to provide a new support that can be produced at a very attractive price and that presents no risk of partial deterioration of its function, for example during the manufacturing, handling, storage, trimming or bundling phases.
- Yet another object of the invention is to provide a print-write support which can be made up of superimposed bundles, without risk of successive reproductions on the lower or underlying supports of the information printed or written on the first accessible support.
- a further object of the invention is to propose a new support making it possible to combine the effects of the object of the invention with other known treatments, to confer additional characteristics of tamper-proofing, such as the appearance of colored reactions via commercial solvents or chemical reagents or erasers.
- the object of the invention is characterized in that it comprises a substrate associated, at least on the surface, with mineral or organic products having an absorbent power equivalent to an oil uptake at less than 150 g per hundred grams of these products, oil uptake measured according to the NF T 30 022 method (or ISO 787/5/1980).
- the object of the invention is based on the use of the remarkable absorbent properties of certain mineral or organic products and, more particularly, those characterized by an absorbent capacity equivalent to an oil uptake at least equal to 150 g per hundred grams. of product, oil intake measured or evaluated according to the NF T 30 022 method (or ISO 787/5/1980).
- the absorbent products are also chosen from those characterized by a very high specific surface greater than 20 m 2 / g, measured according to the BET method (BRUNAUER, EMMETT and TELLER, J. AM. CHEM SOC. 60 , 309 (1938)).
- Absorbent products meeting these two characteristics can be used by being incorporated into the mass or coated by coating on the surface of the support.
- all the supports usually usable in printing-writing can be associated with the absorbent product according to the invention, that is to say the plastic films and the sheets of fibers of more or less cellulosic origin obtained by paper or any other process.
- a support according to the invention has an inert nature and is insensitive to external agents, as well as to thermal or climatic modifications.
- such a support is insensitive to the pressure constraints that can be applied, for example during manufacture, storage, handling, trimming or bundling during of which it does not undergo any destruction of capacities which it conceals.
- Another advantage of the invention lies in the fact that such a support can be treated by incorporation, in the mass or on the surface, at a low cost, since the treatment of such a support can be carried out by usual manufacturing and / or surfacing-coating techniques.
- These products can be introduced into the mass during the preparation of the constituent material of the plastic film or of the paper pulp, as is usually practiced in this field as regards the mineral fillers introduced into the pulp. The proportion can then be between 5 and 20% by weight remaining in the support.
- These products can also be deposited by surfacing or coating on one of the faces of a substrate, such as a plastic film or a sheet of paper, at a rate of 1 to 10 g / m. This deposition can occur during the manufacture of the substrate or by a clean operation, outside of manufacture, by the means usually used to make a surfacing or coating of a substrate.
- the product or products with a high absorption power enter, for the essential part, in the composition of the coating, by being associated with the usual binders, such as starches, starches and their derivatives or other binders used and known in the art for coating or surfacing.
- binders such as starches, starches and their derivatives or other binders used and known in the art for coating or surfacing.
- additional fillers usually used, for example in stationery, for example to improve the conditions of deposition, cohesion, fineness or color.
- a substrate constituted by a paper and intended to represent a falsifiable printing-writing medium.
- a mineral product with high absorbency such as a precipitated aluminum silicate, for example that known commercially as "Pasilex” sold by the company DEGUSSA, is incorporated into the paper pulp before passing through the machine. rate of 15% remaining in the paper after manufacture.
- the product "Pasilex” is chosen from the range having an absorbent power equivalent to an oil intake of 160 g per 100 g of product and offering a specific surface of 100 m 2 / g calculated according to the BET method (BRUNAUER, EMMETT and TELLER, J. AM. CHEM. SOC., 60, 309 (1938)).
- This sauce is applied by a size press, on a paper machine, to the surface of a sheet of support paper of 93 g / m 2 , so as to deposit 2 to 5 g of dry matter of the sauce per square meter.
- This sauce is applied in conventional coating, for example by means of a trailing blade coater, in order to deposit 1 to 5 g of dry matter per square meter of surface.
- Examples 2 and 3 above can be used for a substrate constituted, for example, by an opaque oriented polypropylene film, for example in the case of application to credit cards, to identity cards.
- the print-writing medium thus obtained has normal printability characteristics and prohibits any attempt at falsification by friction, in particular by scrubbing, of a mark made with a ballpoint pen of the type of that of American patent 4 097 280 or of a type neighboring, but leading to the same result, and comprising an ink, said to be erasable for a certain time corresponding, for example, to the duration of evaporation of a slow solvent.
- Such a print-write medium can also include a tamper-proofing treatment using chemical compounds giving colored reactions with solvents, acids, bases, oxidants or reducing agents.
- the object of the invention finds a particularly advantageous application in the field of security papers or documents of value, such as checks, commercial paper, as well as support documents or other means of identification of a personal nature, such as credit cards, toll pass cards or ID cards.
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- Color Printing (AREA)
- Heat Sensitive Colour Forming Recording (AREA)
- Non-Silver Salt Photosensitive Materials And Non-Silver Salt Photography (AREA)
- Credit Cards Or The Like (AREA)
- Paper (AREA)
- Inks, Pencil-Leads, Or Crayons (AREA)
Abstract
Description
La présente invention est relative au problème posé par le risque de falsification attaché à l'utilisation d'un stylo à bille à encre effaçable par gommage ou grattage.The present invention relates to the problem posed by the risk of falsification attached to the use of a ballpoint pen with ink erasable by erasing or scraping.
On sait que les encres de stylos à bille sont, principalement, composées à base de pigments minéraux ayant des propriétés de stabilité et d'inattaquabilité remarquables. Cependant, ces encres ont l'inconvénient de ne pas se prêter facilement à des corrections, à moins d'utiliser des moyens techniques agressifs qui laissent subsister une trace ou marque indélébile sur le support écrit.We know that ballpoint pen inks are mainly composed of mineral pigments with remarkable stability and unassailable properties. However, these inks have the disadvantage of not easily lending themselves to corrections, unless using aggressive technical means which leave an indelible mark or mark on the written medium.
En vue de remédier à cet inconvénient, il a été proposé une encre de stylo à bille, par exemple du type de celle décrite dans le brevet US-A-4 097 290. Selon cet enseignement, l'encre peut être considérée comme incluant, dans sa composition, un premier type de solvant rapide servant à accrocher immédiatement les pigments colorés sur le support, de manière à établir une fixation matérielle sur le support. L'encre contient, également, un second solvant pouvant être qualifié de lent et dont l'évaporation conduit à la liaison intime entre les liants des pigments colorés et la couche superficielle du support. Tant que le second solvant n'est pas complètement évaporé, les pigments colorés peuvent être effacés par frottement, tel que grattage ou, plus particulièrement, gommage.In order to remedy this drawback, a ballpoint pen ink has been proposed, for example of the type described in US Pat. No. 4,097,290. According to this teaching, the ink can be considered to include, in its composition, a first type of rapid solvent used to immediately hang the colored pigments on the support, so as to establish a material fixation on the support. The ink also contains a second solvent which can be described as slow and whose evaporation leads to the intimate bond between the binders of the colored pigments and the surface layer of the support. As long as the second solvent is not completely evaporated, the colored pigments can be erased by rubbing, such as scraping or, more particularly, scrubbing.
Ainsi, l'utilisation d'un stylobille chargé d'une encre du type ci-dessus permet des corrections successives pendant un laps de temps donné et facilite, par exemple, l'exécution de documents ou d'imprimés de caractère courant.Thus, the use of a ballpoint pen loaded with an ink of the above type allows successive corrections for a given period of time and facilitates, for example, the execution of documents or printed matter of a current character.
On conçoit, cependant, que l'utilisation d'un tel stylobille pour remplir des documents de sûreté, des documents de valeur à caractère fiduciaire ou scripturaire rend possible une falsification de tels documents pendant toute la durée de fixation définitive des pigments colorés, laquelle est éssentiellement variable en raison par exemple des conditions d'utilisation, de la nature du support, de la température ambiante ou du degré hygrométrique.It is understood, however, that the use of such a ballpoint pen for filling in security documents, documents of value of fiduciary or scriptural nature makes it possible to falsify such documents during the entire period of definitive fixing of the colored pigments, which is essentially variable due for example to the conditions of use, the nature of the support, the ambient temperature or the hygrometric degree.
Un tel risque est d'autant plus important qu'il est pratiquement impossible de contrôler, dans chaque cas pouvant se présenter, la nature du stylo à bille utilisé pour remplir un document de sûreté.Such a risk is all the more important since it is practically impossible to control, in each case that may arise, the nature of the ballpoint pen used to fill out a security document.
Face à un tel risque, il s'est donc avéré nécessaire de proposer, pour l'exécution de tels documents de valeur, des supports interdisant toute possibilité de falsification des marques imprimées ou écrites au moyen de stylobilles utilisant une encre du type de celle décrite dans le brevet UA-A-4 097 290 ou d'un type voisin, mais conduisant au même résultat.Faced with such a risk, it therefore proved necessary to propose, for the execution of such valuable documents, supports prohibiting any possibility of falsification of the marks printed or written by means of ball-point pens using an ink of the type of that described. in patent UA-A-4,097,290 or a similar type, but leading to the same result.
La demande allemande DE-A-29 51 486 propose, dans ce sens, l'incorporation dans la masse constitutive du support impression-écriture, de colorants micro-encapsulés et d'un silicate acide accepteur de colorants. Sous la pression engendrée par la pointe d'un stylobille utilisé pour écrire sur un tel support, les capsules sont crevées et libèrent le colorant qui réagit avec le silicate acide pour former une trace dans la masse du support.German application DE-A-29 51 486 proposes, in this sense, the incorporation into the constituent mass of the print-write support, of microencapsulated dyes and of an acid silicate acceptor of dyes. Under the pressure generated by the tip of a pen used to write on such a support, the capsules are punctured and release the dye which reacts with the acid silicate to form a trace in the mass of the support.
Ainsi, toute tentative de falsification, pour éliminer la trace de l'encre propre au stylobille, laisse apparaître la marque interne au papier qui représente, alors, la trace matérielle d'une tentative de falsification. Si une telle tentative est conduite au moyen d'une gomme appuyée fortement sur le support, la pression localement exercée développe, sur toute la surface concernée, une marque accroissant encore la preuve de tentative de falsification.Thus, any attempt at falsification, to eliminate the trace of the ink specific to the ballpoint pen, lets appear the internal mark on the paper which then represents the physical trace of an attempt at falsification. If such an attempt is made by means of an eraser strongly supported on the support, the locally exerted pressure develops, over the entire surface concerned, a mark further increasing the proof of attempted falsification.
Un tel papier ne convient pas, en réalité. pratiquement à l'objectif recherché, car toute manipulation, pression ou choc supporté par le papier au cours de l'utilisation, de la manutention ou du stockage, conduit à la formation de marques qui peuvent être rédhibitoires pour l'utilisation ultérieure.Such paper is actually not suitable. practically the desired objective, because any manipulation, pressure or shock supported by the paper during use, handling or storage, leads to the formation of marks which can be unacceptable for subsequent use.
En outre, un tel papier ne peut pas être utilisé dans le cas de supports impression-écriture reliés et superposés car la pression exercée sur le papier de dessus est transmise à l'un au moins des exemplaires sous-jacents sur lesquels apparaissent les mêmes traces que les marques portées sur le premier papier.In addition, such a paper cannot be used in the case of linked and overlapping print-write media because the pressure exerted on the top paper is transmitted to at least one of the underlying copies on which the same traces appear. than the marks on the first paper.
En outre, la fabrication d'un tel support est relativement onéreuse, en raison de la nécessité de réaliser la micro-encapsulation du colorant et de mettre en oeuvre des moyens de fabrication particulièrement délicats pour éviter que l'incorporation dans la masse ne fasse apparaître des marques indélébiles rédhibitoires sur le support définitivement réalisé.In addition, the manufacture of such a support is relatively expensive, due to the need to carry out micro-encapsulation of the dye and to use particularly delicate manufacturing means to prevent incorporation in the mass does not appear unacceptable indelible marks on the definitively produced support.
La demande de brevet européenne 0 029 714 propose de faire intervenir, par couchage sur un support impression-écriture, un film de produits adsorbants, accepteurs d'électrons, tels qu'un gel de silice ou un kaolin réactif.European patent application 0 029 714 proposes using, by coating on a print-write support, a film of adsorbent products, electron acceptors, such as a silica gel or a reactive kaolin.
On peut penser qu'il est donc nécessaire, pour qu'une tentative de falsification apparaisse, d'utiliser une encre ayant une affinité avec le produit adsorbant, de manière à fournir des électrons capables de réagir avec un tel produit. Une telle exigence ne peut être portée au compte de toutes les encres utilisées, de sorte que la garantie d'absence de falsification ne peut être procurée.It may be thought that it is therefore necessary, for an attempt at falsification to appear, to use an ink having an affinity with the adsorbent product, so as to supply electrons capable of reacting with such a product. Such a requirement cannot be applied to the account of all the inks used, so that the guarantee of absence of falsification cannot be obtained.
On peut penser, également, qu'une liaison d'adsorption est fragile, au sens physique du terme, et que, dans certaines circonstances, un gommage peut, éventuellement, être mené à bien.One can also think that an adsorption bond is fragile, in the physical sense of the term, and that, in certain circumstances, an exfoliation can, possibly, be carried out.
Une telle proposition ne répond donc pas positivement au problème posé.Such a proposal does not therefore respond positively to the problem posed.
La demande de brevet français FR-A-2 483 480 concerne un papier de sécurité comprenant en surface des micro-capsules contenant un solvant de l'encre du type de celle enseignée par le brevet américain 4 097 290. Les micro-capsules, crevées lors de l'application d'une pression par la pointe du stylobille, libèrent le solvant qu'elles contiennent, lequel dilue, en partie au moins, l'encre du stylo et entraîne les pigments inorganiques dans la couche superficielle.French patent application FR-A-2 483 480 relates to a security paper comprising on the surface micro-capsules containing an ink solvent of the type of that taught by American patent 4 097 290. The micro-capsules, punctured when applying pressure from the tip of the pen, release the solvent they contain which dilutes at least part of the pen ink and carries inorganic pigments into the surface layer.
Toute tentative de falsification visant à effacer une trace colorée par un tel papier ne peut être menée à bien qu'en détruisant la couche superficielle dans laquelle les pigments dilués ont été entraînés. Une telle destruction physique du support ne peut être dissimulée et apporte donc la preuve d'une tentative de falsification.Any attempt at falsification aimed at erasing a colored trace by such paper can only be carried out by destroying the surface layer in which the diluted pigments have been entrained. Such physical destruction of the support cannot be concealed and therefore provides proof of an attempt at falsification.
Une telle proposition peut être considérée comme apportant une solution théorique au problème réel posé.Such a proposition can be considered as providing a theoretical solution to the real problem posed.
Cependant, en pratique, un papier ou support impression-écriture, réalisé selon cette technique, est d'un coût relativement élevé, compte tenu de la nécessité de procéder à la micro-encapsulation du solvant responsable de la dilution ultérieure de l'encre.However, in practice, a paper or print-writing medium, produced according to this technique, is relatively high cost, taking into account the need to micro-encapsulate the solvent responsible for the subsequent dilution of the ink.
En outre, il faut considérer que toute pression appliquée au support impression-écriture, par exemple lors de la manipulation, du stockage ou la fabrication, conduit aussi à la rupture des ou micro-capsules qui libèrent le solvant en l'absence d'encre, puisque dans ces phases préalables à l'utilisation, de tels documents n'ont pas été impressionnés ou écrits.In addition, it must be considered that any pressure applied to the print-write support, for example during handling, storage or manufacture, also leads to the rupture of the micro-capsules which release the solvent in the absence of ink. , since in these pre-use phases, such documents were not impressed or written.
Ainsi, lors de l'écriture ou de l'impression ultérieure, il peut se produire que la marque colorée soit apposée sur une zone ou surface dont les micro-capsules ont déjà été crevées. Dans un tel cas, la fonction de ces micro-capsules ne peut plus intervenir, puisque le solvant est déjà dilué ou évaporé.Thus, during writing or subsequent printing, it may happen that the colored mark is affixed on an area or surface whose microcapsules have already been punctured. In such a case, the function of these microcapsules can no longer intervene, since the solvent is already diluted or evaporated.
Une tentative de falsification sur ces zones ou surfaces pourrait alors être menée à bien.An attempt at falsification on these areas or surfaces could then be carried out.
Le FR-A-2 491 968 propose un papier de sécurité associé en masse ou en surface à des micro-capsules contenant un solvant pour solubiliser le colorant ayant servi à l'inscription.FR-A-2 491 968 offers a security paper associated in bulk or on the surface with microcapsules containing a solvent to dissolve the dye used for registration.
Outre les mêmes inconvénients que ceux devant être portés au compte de la demande française FR-A-2 483 480, il faut noter qu'une telle proposition n'apparait pas compatible avec des encres contenant des pigments minéraux.In addition to the same drawbacks as those to be charged to the French application FR-A-2 483 480, it should be noted that such a proposal does not appear compatible with inks containing mineral pigments.
La présente invention vise à apporter une solution au problème ainsi posé par l'existence d'encres et de stylobilles du type de celui décrit dans le brevet US-A-4 097 290, en proposant un support supprimant toute possibilité de gommage de l'encre immédiatement après son dépôt.The present invention aims to provide a solution to the problem thus posed by the existence of inks and stylobilles of the type described in US Pat. No. 4,097,290, by proposing a support eliminating any possibility of erasing the ink immediately after filing.
Un autre objet de l'invention est de proposer un nouveau support pouvant être produit à un prix très intéressant et ne présentant aucun risque de détérioration partielle de sa fonction, par exemple au cours des phases de fabrication, manipulation, stockage, massicotage ou enliassage.Another object of the invention is to provide a new support that can be produced at a very attractive price and that presents no risk of partial deterioration of its function, for example during the manufacturing, handling, storage, trimming or bundling phases.
Un autre objet encore de l'invention est de fournir un support impression-écriture pouvant être constitué en liasses superposées, sans risque de reproductions successives sur les supports inférieurs ou sousjacents des informations imprimées ou écrites sur le premier support accessible.Yet another object of the invention is to provide a print-write support which can be made up of superimposed bundles, without risk of successive reproductions on the lower or underlying supports of the information printed or written on the first accessible support.
Un objet encore de l'invention est de proposer un nouveau support permettant de combiner les effets de l'objet de l'invention avec d'autres traitements connus, pour conférer des caractéristiques d'infalsifiabilité complémentaires, telles que l'apparition de réactions colorées par l'intermédiaire de solvants ou de réactifs chimiques ou effaceurs du commerce.A further object of the invention is to propose a new support making it possible to combine the effects of the object of the invention with other known treatments, to confer additional characteristics of tamper-proofing, such as the appearance of colored reactions via commercial solvents or chemical reagents or erasers.
Pour atteindre les buts ci-dessus, l'objet de l'invention est caractérisé en ce qu'il comprend un substrat associé, au moins en surface, à des produits minéraux ou organiques ayant un pouvoir absorbant équivalent à une prise d'huile au moins égale à 150 g pour cent grammes de ces produit, prise d'huile mesurée selon la méthode NF T 30 022 (ou ISO 787/5/1980).To achieve the above objects, the object of the invention is characterized in that it comprises a substrate associated, at least on the surface, with mineral or organic products having an absorbent power equivalent to an oil uptake at less than 150 g per hundred grams of these products, oil uptake measured according to the NF T 30 022 method (or ISO 787/5/1980).
Diverses autres caractéristiques ressortent de la description détaillée qui suit.Various other characteristics will emerge from the detailed description which follows.
L'objet de l'invention est basé sur l'utilisation des propriétés absorbantes remarquables de certains produits minéraux ou organiques et, plus particulièrement, ceux caractérisés par un pouvoir absorbant équivalent à une prise d'huile au moins égale à 150 g pour cent grammes de produit, prise d'huile mesurée ou évaluée selon la méthode NF T 30 022 (ou ISO 787/5/1980).The object of the invention is based on the use of the remarkable absorbent properties of certain mineral or organic products and, more particularly, those characterized by an absorbent capacity equivalent to an oil uptake at least equal to 150 g per hundred grams. of product, oil intake measured or evaluated according to the NF T 30 022 method (or ISO 787/5/1980).
La porosité de surface, tout-à-fait particulière et remarquable des particules de ces produits absorbants, conduit, lorsqu'un support comporte de tels produits surfacés, couchés ou introduits dans la masse, à une absorption au moins partielle et instantanée de tout ou partie des colorants. Cette absorption est très nettement supérieure à l'absorption normale d'un support impression-écriture surfacé ou couché par les produits habituels entrant dans la composition de tels supports, tels que cellulose, colle, charge, amidon, latex, kaolin ou carbonate de calcium.The very particular and remarkable surface porosity of the particles of these absorbent products leads, when a support comprises such surfaced products, coated or introduced into the mass, to an at least partial and instantaneous absorption of all or part of the dyes. This absorption is very much greater than the normal absorption of a print-write support surfaced or coated with the usual products used in the composition of such supports, such as cellulose, glue, filler, starch, latex, kaolin or calcium carbonate. .
Avantageusement, selon l'invention, les produits absorbants sont aussi choisis parmi ceux caractérisés par une surface spécifique très élevée supérieure à 20 m2/g, mesurée selon la méthode BET (BRUNAUER, EMMETT et TELLER, J. AM. CHEM SOC. 60, 309 (1938)).Advantageously, according to the invention, the absorbent products are also chosen from those characterized by a very high specific surface greater than 20 m 2 / g, measured according to the BET method (BRUNAUER, EMMETT and TELLER, J. AM. CHEM SOC. 60 , 309 (1938)).
Des produits absorbants, répondant à ces deux caractéristiques peuvent être utilisés en étant incorporés dans la masse ou enduits par couchage en surface du support. A cet égard, tous les supports habituellement utilisables en impression-écriture peuvent être associés au produit absorbant selon l'invention, c'est-à-dire les films en matière plastique et les nappes de fibres d'origine plus ou moins cellulosique obtenues par voie papetière ou par tout autre procédé.Absorbent products meeting these two characteristics can be used by being incorporated into the mass or coated by coating on the surface of the support. In this respect, all the supports usually usable in printing-writing can be associated with the absorbent product according to the invention, that is to say the plastic films and the sheets of fibers of more or less cellulosic origin obtained by paper or any other process.
Un support selon l'invention présente un caractère inerte et insensible aux agents extérieurs, ainsi qu'aux modifications thermiques ou climatiques. En outre, un tel support est insensible aux contraintes de pression pouvant être appliquées par exemple lors de la fabrication, du stockage, de la manipulation, du massicotage ou de l'enliassage au cours desquels il ne subit aucune destruction de capacités qu'il recèle.A support according to the invention has an inert nature and is insensitive to external agents, as well as to thermal or climatic modifications. In addition, such a support is insensitive to the pressure constraints that can be applied, for example during manufacture, storage, handling, trimming or bundling during of which it does not undergo any destruction of capacities which it conceals.
Un autre avantage de l'invention réside dans le fait qu'un tel support peut être traité par incorporation, dans la masse ou en surface, à un coût faible, étant donné que le traitement d'un tel support peut être mené à bien par les techniques habituelles de fabrication et/ou de surfaçage- couchage.Another advantage of the invention lies in the fact that such a support can be treated by incorporation, in the mass or on the surface, at a low cost, since the treatment of such a support can be carried out by usual manufacturing and / or surfacing-coating techniques.
De préférence, selon l'invention, on utilise, en tant que produits à caractéristiques remarquables d'absorption,
- - des silices précipitées, par exemple celles dénommées "FK 320 DS" vendues par la Société DEGUSSA ou celles dénommées "Tixosil6 375, TixosilO 333" vendues par la Société RHONE-POULENC,
- -des silicates d'aluminium, par exemple, ceux vendus sous le nom de "Pasilexm" par la Société DEGUSSA,
- -des silico-aluminates de sodium, par exemple ceux vendus par la Société RHONE POULENC sous le nom de "ZéolexO",
- - des pigments organiques d'urée- formaldéhyde, par exemple ceux vendus sous le nom de "Pergopakm M 2" par la Société CIBA-GEIGY.
- - precipitated silicas, for example those called "FK 320 DS" sold by the company DEGUSSA or those called "Tixosil 6 375, Tixosil O 333" sold by the company RHONE-POULENC,
- aluminum silicates, for example, those sold under the name "Pasilex m " by the company DEGUSSA,
- sodium silico-aluminates, for example those sold by the company RHONE POULENC under the name of "Zéolex O ",
- - organic urea-formaldehyde pigments, for example those sold under the name of "Pergopak m M 2" by the company CIBA-GEIGY.
Ces produits peuvent être introduits dans la masse lors de la préparation de la matière constitutive du film en matière synthétique ou de la pâte à papier, comme cela est habituellement pratiqué dans ce domaine pour ce qui concerne les charges minérales introduites dans la pâte. La proportion peut alors être comprise entre 5 et 20 % en poids restant dans le support. Ces produits peuvent, aussi, être déposés par surfaçage ou couchage sur l'une des faces d'un substrat, tel qu'un film de matière plastique ou une feuille de papier, à raison de 1 à 10 g/m. Ce dépôt peut intervenir au cours de la fabrication du substrat ou par une opération propre, hors fabrication, par les moyens habituellement utilisés pour réaliser un surfaçage ou un couchage d'un substrat.These products can be introduced into the mass during the preparation of the constituent material of the plastic film or of the paper pulp, as is usually practiced in this field as regards the mineral fillers introduced into the pulp. The proportion can then be between 5 and 20% by weight remaining in the support. These products can also be deposited by surfacing or coating on one of the faces of a substrate, such as a plastic film or a sheet of paper, at a rate of 1 to 10 g / m. This deposition can occur during the manufacture of the substrate or by a clean operation, outside of manufacture, by the means usually used to make a surfacing or coating of a substrate.
Dans le cas de dépôt en surface, le ou les produits à grand pouvoir d'absorption entrent, pour la partie essentielle, dans la composition de l'enduction, en étant associés aux liants habituels, tels que fécules, amidons et leurs dérivés ou les autres liants utilisés et connus dans la technique pour procéder au couchage ou au surfaçage. Dans ce sens, il peut être prévu, également, d'associer aux produits à pouvoir absorbant une ou des charges additionnelles habituellement utilisées, par exemple en papeterie, pour améliorer par exemple les conditions de dépôt, la cohésion, la finesse ou la couleur.In the case of surface deposition, the product or products with a high absorption power enter, for the essential part, in the composition of the coating, by being associated with the usual binders, such as starches, starches and their derivatives or other binders used and known in the art for coating or surfacing. In this sense, provision may also be made to combine with the absorbent products one or more additional fillers usually used, for example in stationery, for example to improve the conditions of deposition, cohesion, fineness or color.
Il doit être considéré que les deux procédés ci-dessus peuvent aussi être mis en oeuvre simultanément, en prévoyant, par exemple, de réaliser, lors de la fabrication, un substrat associé à des produits à pouvoir absorbant incorporés en masse et déposés sur l'une des faces.It should be considered that the two above processes can also be implemented simultaneously, by providing, for example, during production, for producing a substrate associated with absorbent products incorporated in mass and deposited on the one of the faces.
L'absorption conférée par les produits selon l'invention rend impossible, sauf altération profonde du support rendant alors évidente une tentative de falsification, un effaçage par gommage de l'encre déposée sur un tel support. Ainsi, même en présence d'une encre comportant un premier solvant, dit de simple accrochage, et un second solvant lent dont l'évaporation ultérieure permet alors seulement d'obtenir une liaison intime, les produits selon l'invention s'opposent à tout gommage instantanément après le marquage d'un tel support.The absorption conferred by the products according to the invention makes it impossible, except for profound alteration of the support then making an attempt at falsification obvious, erasing by erasing the ink deposited on such a support. Thus, even in the presence of an ink comprising a first solvent, said to be of simple adhesion, and a second slow solvent whose subsequent evaporation then only makes it possible to obtain an intimate bond, the products according to the invention oppose all instantly scrub after marking such a support.
On donne ci-après quelques exemples de mise en oeuvre de l'objet de l'invention pour un substrat constitué par un papier et destiné à représenter un support impression-écriture infalsifiable.Some examples of implementation of the subject of the invention are given below for a substrate constituted by a paper and intended to represent a falsifiable printing-writing medium.
On incorpore à la pâte à papier, avant son passage sur machine, un produit minéral à grand pouvoir absorbant, tel qu'un silicate d'aluminium précipité, par exemple celui dénommé dans le commerce "Pasilex"commercialisé par la Société DEGUSSA, à un taux de 15 % restant dans le papier après fabrication. Le produit "Pasilex" est choisi dans la gamme ayant un pouvoir absorbant équivalent à une prise d'huile de 160 g pour 100 g de produit et offrant une surface spécifique de 100 m2/g calculée selon la méthode BET (BRUNAUER, EMMETT et TELLER, J. AM. CHEM. SOC., 60, 309 (1938)).A mineral product with high absorbency, such as a precipitated aluminum silicate, for example that known commercially as "Pasilex" sold by the company DEGUSSA, is incorporated into the paper pulp before passing through the machine. rate of 15% remaining in the paper after manufacture. The product "Pasilex" is chosen from the range having an absorbent power equivalent to an oil intake of 160 g per 100 g of product and offering a specific surface of 100 m 2 / g calculated according to the BET method (BRUNAUER, EMMETT and TELLER, J. AM. CHEM. SOC., 60, 309 (1938)).
On produit une sauce de surfaçage comportant:
- - un liant, tel qu'un amidon oxydé ou une fécule enzymée, à raison de huit parties en poids,
- -un produit minéral à grand pouvoir absorbant, tel que de la silice "FK 320 DS" à raison de huit parties en poids et possédant un pouvoir absorbant équivalent à une prise d'huile de 230 g/100 g et une surface spécifique 170 m2/g (BET),
- -de l'eau à raison de quatre vingt quatre parties en poids.
- - a binder, such as an oxidized starch or an enzyme starch, in an amount of eight parts by weight,
- -a mineral product with high absorbency, such as silica "FK 320 DS" at a rate of eight parts by weight and having an absorbent power equivalent to an oil intake of 230 g / 100 g and a specific surface 170 m 2 / g (BET),
- water at the rate of eighty four parts by weight.
Cette sauce est appliquée par une presse encolleuse, sur machine à papier, sur la surface d'une feuille de papier support de 93 g/m2, de façon à déposer de 2 à 5 g de matière sèche de la sauce par mètre carré.This sauce is applied by a size press, on a paper machine, to the surface of a sheet of support paper of 93 g / m 2 , so as to deposit 2 to 5 g of dry matter of the sauce per square meter.
On produit une sauce de surfaçage comportant:
- -un produit à grand pouvoir absorbant de nature minérale, tel que de la silice "Tixosil 375", à raison de huit parties en poids et possédant un pouvoir absorbant équivalent à une prise d'huile de 310 g/100 g et une surface spécifique 180 m2/g (BET),
- -une charge additionnelle constituée par un talc 005, commercialisé par la Société TALC LUZENAC, à raison de huit parties en poids,
- -un liant tel que le "PhodovioI• 30/5" commercialisé par la Société RONE-POULENC, à raison de trois parties en poids,
- - de l'eau à raison de quatre vingt une parties en poids.
- -a product with high absorbency of mineral nature, such as silica "Tixosil 375", at a rate of eight parts by weight and having an absorbency equivalent to an oil intake of 310 g / 100 g and a specific surface 180 m 2 / g (BET),
- an additional charge constituted by talc 005, sold by the company TALC LUZENAC, at a rate of eight parts by weight,
- -a binder such as "PhodovioI • 30/5" sold by the company RONE-POULENC, at a rate of three parts by weight,
- - water at the rate of eighty-one parts by weight.
Cette sauce est appliquée en couchage conventionnel, par exemple au moyen d'une coucheuse à lame traînante, de façon à déposer de 1 à 5 g de matière sèche par mètre carré de surface.This sauce is applied in conventional coating, for example by means of a trailing blade coater, in order to deposit 1 to 5 g of dry matter per square meter of surface.
Les exemples 2 et 3 ci-dessus peuvent être mis en oeuvre pour un substrat constitué, par exemple, par un film opaque en polypropylène orienté, par exemple dans le cas d'application aux cartes de crédit, aux cartes d'identité.Examples 2 and 3 above can be used for a substrate constituted, for example, by an opaque oriented polypropylene film, for example in the case of application to credit cards, to identity cards.
Le support impression-écriture ainsi obtenu possède des caractéristiques normales d'imprimabilité et interdit toute tentative de falsification par frottement, notamment par gommage, d'une marque effectuée avec un stylobille du type de celui du brevet americain 4 097 280 ou d'un type voisin, mais conduisant au même résultat, et comportant une encre, dite gommable pendant un certain temps correspondant, par exemple, à la durée d'évaporation d'un solvant lent.The print-writing medium thus obtained has normal printability characteristics and prohibits any attempt at falsification by friction, in particular by scrubbing, of a mark made with a ballpoint pen of the type of that of American patent 4 097 280 or of a type neighboring, but leading to the same result, and comprising an ink, said to be erasable for a certain time corresponding, for example, to the duration of evaporation of a slow solvent.
Un tel support impression-écriture peut aussi comporter un traitement d'infalsifiabilité à partir de composés chimiques donnant des réactions colorées avec des solvants, des acides, des bases, des oxydants ou des réducteurs.Such a print-write medium can also include a tamper-proofing treatment using chemical compounds giving colored reactions with solvents, acids, bases, oxidants or reducing agents.
L'objet de l'invention trouve une application particulièrement intéressante dans le domaine des papiers de sûreté ou des documents de valeurs, tels que les chèques, les effets de commerce, ainsi que les documents supports ou autres moyens d'identification à caractère personnel, tels que les cartes de crédit, les cartes d'abonnement de péage ou les cartes d'identité.The object of the invention finds a particularly advantageous application in the field of security papers or documents of value, such as checks, commercial paper, as well as support documents or other means of identification of a personal nature, such as credit cards, toll pass cards or ID cards.
Claims (8)
characterized in that it comprises a substrate associated, at least on the surface, with inorganic or organic products having an absorbent porter equivalent to an oil absorption at least equal to 150 g per hundred grams of these products, oil absorption measured in accordance with the method NFT 30022 (or ISO 787/5/1980).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AT85420214T ATE33410T1 (en) | 1984-12-05 | 1985-12-02 | ANTI-COUNTERFEIT PRINT MEDIA OR FONT. |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR8418791A FR2574099B1 (en) | 1984-12-05 | 1984-12-05 | INFALSIFIABLE PRINT-WRITE SUPPORT |
| FR8418791 | 1984-12-05 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0184529A1 EP0184529A1 (en) | 1986-06-11 |
| EP0184529B1 true EP0184529B1 (en) | 1988-04-06 |
Family
ID=9310394
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP85420214A Expired EP0184529B1 (en) | 1984-12-05 | 1985-12-02 | Forgery-proof impression-writing support |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP0184529B1 (en) |
| AT (1) | ATE33410T1 (en) |
| DE (1) | DE3562104D1 (en) |
| FR (1) | FR2574099B1 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19709735A1 (en) * | 1997-03-10 | 1998-09-17 | Sihl Gmbh | Inkjet recording material |
| ATE359183T1 (en) | 2002-07-26 | 2007-05-15 | Belgique Banque Nat | PROTECTION AGAINST DATA CORRUPTION |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| ZA714498B (en) * | 1970-07-30 | 1972-03-29 | Cabot Corp | Paper coating compositions and paper coated therewith |
| GB1457374A (en) * | 1973-11-20 | 1976-12-01 | Holtzmann Cie Ag E | Embossable single-coated or multicoated print carrier and a pro- cess for its manufacture |
| DE2449616C3 (en) * | 1974-10-18 | 1978-05-18 | Deutsche Gold- Und Silber-Scheideanstalt Vormals Roessler, 6000 Frankfurt | Process for the production of coated papers |
| US4260454A (en) * | 1978-10-10 | 1981-04-07 | J. M. Huber Corporation | Precipitated siliceous products used in paper |
| JPS5628640A (en) * | 1979-08-18 | 1981-03-20 | Tokuyama Soda Co Ltd | Molded product for absorbing liquid |
| EP0029714A1 (en) * | 1979-11-21 | 1981-06-03 | The Wiggins Teape Group Limited | Method of preventing erasure of an image and a booklet of security papers |
| GB2122545B (en) * | 1982-06-26 | 1985-10-02 | Coated Papers Limited | Security paper |
-
1984
- 1984-12-05 FR FR8418791A patent/FR2574099B1/en not_active Expired
-
1985
- 1985-12-02 DE DE8585420214T patent/DE3562104D1/en not_active Expired
- 1985-12-02 EP EP85420214A patent/EP0184529B1/en not_active Expired
- 1985-12-02 AT AT85420214T patent/ATE33410T1/en not_active IP Right Cessation
Also Published As
| Publication number | Publication date |
|---|---|
| FR2574099A1 (en) | 1986-06-06 |
| ATE33410T1 (en) | 1988-04-15 |
| EP0184529A1 (en) | 1986-06-11 |
| DE3562104D1 (en) | 1988-05-11 |
| FR2574099B1 (en) | 1987-02-27 |
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