EP0727316A1 - Printable document comprising means for revealing forgery - Google Patents

Abstract

A document for receiving printing comprises (a) a support layer of (semi)rigid material, e.g. paper, and (b) a colour layer on the support contg. (i) a first substance producing a colour reaction when contacted with (ii) a second substance, under exterior pressure. The second layer is incorporated in the body of the support layer.

Description

The present invention relates to a document capable of being printed and comprising means making it possible to reveal any falsification or attempted falsification.

The invention relates in particular to any document (of the sheet, leaflet, label, check) type capable of being printed, in black and white and / or in color, by any mechanized (printer) or manual (pen) process and of which it is desirable / necessary to ensure that the print has not been altered or modified, with a view to falsification.

More particularly, the invention is applicable to documents such as, for example, checks, tickets, labels of specific products, official documents, etc.

The means used by falsifiers are numerous and include chemical agents of the solvent type, scraping and erasing means, which aim to delete or erase certain information printed on the document in question and replace it with others, such as by example, for a check, the sum and / or the beneficiary.

Means have been proposed, in a known manner, for attempting to detect any attempt at falsification on the document itself.

Special inks, such as magnetic inks, are used to, for example, write the CMC7 code of the check number or other information.

Provided that the said ink is available, which does not prove to be impossible, the falsifier no longer has any obstacles in front of it to scrape or erase the information and replace it with another with said ink.

Furthermore, in a known manner, a complex and dense background pattern is printed on the entire document. If this means partially dissuades and / or makes it difficult and tedious to erase and copy the background pattern, it is not, however, completely reliable, given the obstinacy and patience of some falsifiers.

Other known means provide for the incorporation into the document paper of chemical substances which are not soluble in water but which are soluble in solvents and thus capable of causing a revealing stain of visible color when erasing chemical substances are used ( basic reducers of "erasers"). However, these means do not make it possible to detect falsification by mechanical erasure (scraping or erasing). In addition, it is possible to remove the developer stain with suitable solvents.

Yet another known means consists in using colored paper and in depositing on the face of the paper intended to receive the printing, a layer of opaque product (for example whitish wax) sensitive to pressure. Any unauthorized scraping or printing operation pierces the opaque layer and thus reveals the colored paper located below.

This known type of paper is very fragile, which proves to be inconvenient to use and, moreover, it has a particular aesthetic appearance which limits its applications.

According to another known example, the paper support layer is coated with a coloring layer containing micro-capsules capable of breaking under the effect of pressure during printing / writing to release a coloring substance capable of reacting with a reagent also incorporated in said coloring layer. Such papers, called carbonless, are used in a bundle comprising a first sheet of ordinary paper as an original and one or more additional associated sheets serving as duplicates.

This paper is relatively fragile, due to the extreme sensitivity of the coloring layer, which requires great care when handling the paper to avoid friction, creating unwanted inscriptions. Furthermore, the coloring layer tends to clog the printing means and in particular ballpoint pens.

• être imprimé sans endommager les moyens d'impression ;
• être manipulé sans précaution particulière ;
• déceler et révéler toute tentative de falsification, que ce soit par action chimique ou mécanique ;
• permettre de s'assurer de son authenticité ;
• être utilisé dans de nombreuses applications, sans limitation de couleur, de support, . . .

In this context, the object of the invention is to propose a document capable of:

• be printed without damaging the printing means;
• be handled without special precautions;
• detect and reveal any attempt at falsification, whether by chemical or mechanical action;
• allow to ensure its authenticity;
• be used in many applications, without limitation of color, support,. . .

To this end, according to the invention, the document capable of receiving an impression of the type comprising a support layer of rigid or semi-rigid material, such as paper, is characterized in that it comprises a layer, arranged on at least one face of the support layer, and containing a first substance capable of causing, when it is brought into contact with a second substance, under the effect of an external pressure, a colored reaction, the second substance being incorporated in the mass of the support layer.

According to a preferred embodiment, the second substance is distributed substantially uniformly throughout the thickness of the support layer.

Preferably, the second substance comprises reactive fillers of mineral origin.

Advantageously, the first substance is placed in microcapsules, possibly being associated with a solvent, the microcapsules being able to break under the effect of said pressure.

A protective layer may be provided on the layer including the coloring substance, said protective layer comprising for example natural calcium carbonate for 100 parts, a dispersant for 0.5 parts and styrene butadiene latex for 15 parts.

The support layer can be frictional paper for example and the coloring layer is arranged on the rough side thereof.

The second substance has a surface density of between 1.5 and 15 g / m ² , and preferably between 3 and 7 g / m ² .

The reactive filler preferably consists of alumina silicate based on montmorillonite or phenolic resin or modified silica.

According to another embodiment, a pigment insoluble in water but organosoluble in a solvent is incorporated in the paper support layer, and the layer with coloring matter comprises microcapsules containing a solvent for said pigment.

• La figure 1 montre une vue en coupe schématique d'un exemple de réalisation du document de l'invention ;
• La figure 2 montre le document de la figure 1, en cours d'écriture à l'aide d'un stylo ;
• La figure 3 montre une variante réalisée à l'aide de papier frictionné ;
• La figure 4 montre une autre forme de réalisation ; et
• La figure 5 montre encore une autre forme de réalisation.

The invention will be clearly understood in the light of the description which follows, relating to illustrative but nonlimiting examples, with reference to the appended drawing in which:

• Figure 1 shows a schematic sectional view of an embodiment of the document of the invention;
• Figure 2 shows the document of Figure 1, being written using a pen;
• FIG. 3 shows a variant produced using rubbed paper;
• Figure 4 shows another embodiment; and
• Figure 5 shows yet another embodiment.

The scale and proportions of the figures have been exaggerated for a better understanding of the drawing.

The term document used generically means sheet, check, leaflet, card, label, etc.

With reference to FIG. 1, the document of the invention shown comprises a support layer 1 of paper, on one of the faces of which (the lower face in this case) is arranged a layer comprising microcapsules 3; on layer 2, a protective layer 4 is provided.

Inside the paper support layer 1 are incorporated, in a uniformly distributed manner, reactive charges 5.

The support layer may consist of any type of paper, without limitation and having any fibrous constitution, from virgin or recycled fibers, natural or synthetic, and optionally including adjuvants commonly used in the stationery field, such as neutral, acid or basic bonding products, alumina sulfates for acid bonding or pH adapter, resins, dyes, or any other additional filler or component required for the use and purpose of the paper.

The paper (support layer 1) can undergo any preparation and finishing operation, such as preparation in a "flat table", deposition using an sizing press of an aqueous composition (coating binder such as starch, polyvinyl alcohol , cellulose derivatives).

According to the invention, the preparation of the support layer 1 of paper includes the incorporation into the mass of the paper of reactive fillers, for example of an inorganic constituent, such as more particularly alumina silicate (known under the trade name COPISIL N 210) chemically modified based on montmorillonite. The role of reactive charges is explained later.

On at least one face of the support layer 1, a density layer of between 1 and 12 g / m ² , preferably between 2 and 8 g / m ² , comprising micro-particles 3 is deposited. form of micro-containers with a wall made of natural or synthetic material (for example polyurethane) and defining an interior volume filled with a liquid phase including the coloring substances, possibly dissolved in a solvent such as oil. The coloring substance, colorless as it is in the microcapsules, is capable of causing a colored reaction with the reactive charges 5 incorporated in the mass of the paper 1, said charges being made up of acid clay particles accepting electrons. The formation of the color reaction is explained later.

• * le cristal violet lactone (couleur bleue),
• * le 3 diethylamino-methyl-anilinofluorane (couleur noire),
• * le 3 diethylamino-methyl-chlorofluorane (couleur rouge),
• * le 3 diethylamino-dibenzylaminofluorane (couleur verte);

The coloring substance in the microcapsules includes one of the following components:

• * the lactone violet crystal (blue color),
• * 3 diethylamino-methyl-anilinofluorane (black color),
• * 3 diethylamino-methyl-chlorofluorane (red color),
• * 3 diethylamino-dibenzylaminofluorane (green color);

The layer 2 is composed of a binder added to the microcapsules 3, the binder allowing the adhesion and the maintenance of said microcapsules on the support layer 1. By way of example, the binder can be latex, l starch, polyvinyl alcohols. The quantity of layer 2 deposited preferably varies between 1 and 12 g / m ² , and more particularly between 2 and 8 g / m ² .

Next, a protective layer 4 is deposited on the surface of the layer 2 of microcapsules 3, composed of a mixture of mineral fillers, of the calcium carbonate, kaolin, talc, or similar type, and of binders of the type latex, starch, proteins, polyvinyl alcohol, etc., in order to bind the mineral particles and to ensure the solidity of said protective layer.

• assurer la protection des micro-capsules vis-à-vis des frottements et des pressions accidentelles ou intempestives ;
• permettre l'impression du document par offset, typographie ou autre méthode, sur les deux faces du document ;
• permettre l'écriture sur ladite face sans risque d'encrassement de stylo à bille ;
• permettre, moyennant une adaptation de la formule, d'isoler les uns des autres les documents superposés, en évitant l'impression des documents suivants lors de l'écriture ou de l'impression du premier document.

The protective layer 4 fulfills several functions, namely in particular:

• ensuring the protection of the microcapsules against friction and accidental or untimely pressures;
• allow printing of the document by offset, typography or other method, on both sides of the document;
• allow writing on said face without risk of fouling of ballpoint pen;
• allow, by adapting the formula, to isolate the superimposed documents from each other, avoiding the printing of the following documents when writing or printing the first document.

The use of document 1 is described below, with reference to FIG. 2, in order to allow the detection of any fraud, falsification.

In Figure 2, there is shown by way of example the document of Figure 1, on which moves a printing means represented by the end portion of a ballpoint pen 6, provided with a ball 7, the pen being known in itself and associated with an ink reserve not shown, and flowing around the ball 7 towards the lower part and therefore on the upper face 8 of the paper layer 1. The relative size of the ball pen 6 has been reduced voluntarily for reasons of understanding, compared to document proportions.

When the pen 6 moves on the support layer 1 of paper, the user exerts a pressure comprising a downward vertical main component, which is transmitted by layer 1 to layer 2 comprising microcapsules. The envelope of the latter, under the effect of pressure, breaks and releases the coloring substance which they incorporate; said substance then penetrates into the support layer 1. Note that the coloring substance cannot flow towards the lower part, taking into account the presence of the protective layer 4.

Thus, the passage of the ballpoint pen 6 causes a colored reaction 9 in the mass of the support layer 1 and also on the back of the document.

Any attempt to erase any print on one of the faces (in this case the upper face 8) of the support layer 1, reveals the colored trace 9 which, for its part, cannot be erased.

FIG. 3 shows in section a document produced from a support layer 10 of rubbed paper, that is to say comprising a rough face 11 on the side of the coloring layer 2 and of the protective layer 4, and a smooth surface 12 on the opposite side. The rough face 11 includes surface irregularities in the form of hollows 13 and bumps 14, schematically shown in the figure. In the recesses 13, micro-capsules 3 are placed. This type of paper may include also vegetable charges of ad hoc particle size making it possible to increase the compressibility of the support layer 10.

The irregularities (hollows 13 and bumps 14) and the compressibility of the support 1 dampen the pressure coming from the printing means from the upper face 12 of the support layer 10. This thus avoids, or at least limits, the transmission of pressure on the document located below the one submitted for printing. This has the advantage of avoiding having to use an intermediate card placed under the document being printed.

As a variant, a coloring layer 2 with microcapsules 3 can be placed on each face of the support layer 1, and a protective layer on each of these.

In the embodiment of FIG. 4, the document includes in the mass of the support layer 1, in addition to the reactive fillers 5, colored solid pigments 15 with fine particle size and dispersed in the mass. The pigments are insoluble in water but organosoluble, that is to say soluble as soon as they are brought into contact with organic solvents, this solubilization making it possible to reveal their color.

Also, in another embodiment not shown, there are reactive charges in the protective layer 4. This makes it possible to quantitatively increase the colored reaction on the back of the document.

FIG. 5 shows another variant in the form of a support layer 16, at least one of the faces of which is covered with a layer 2 ′ with microcapsules 3 ′, itself covered with a protective layer 4. The latter is similar to that of the embodiments described with reference to the other figures.

In the mass of the support layer 16, are distributed pigment particles 15 ′, insoluble in water but organosoluble in a solvent of the type of those used to dissolve / erase the printing ink. The 3 'microcapsules contain such a solvent. During printing, the micro-capsules 3 'break and release the solvent which then reacts with the pigments 15' to color the bulk of the support and the back of the document.

We describe below specific examples of embodiment of the invention.

Example 1

• 100 parties de micro-capsules contenant une substance colorante telle que celle connue sous la dénomination commerciale BAYMICRON SLURRY RED ;
• 5 parties de latex styrène butadiène carboxylé (SB 230).

On a paper support containing 5 to 6 g / m ² of chemically modified alumina silicate based on montmorillonite (COPISIL N 210), is deposited on the face of said paper, by any suitable known means (such as size press, rolls), a coating bath containing starch and a product preventing the solubility of the latter, of the melamine formaldehyde type. The paper is then subjected to a calendering treatment. On the support thus prepared, a layer of 5 g / m ² of the following composition is deposited, expressed as dry matter:

• 100 parts of microcapsules containing a coloring substance such as that known under the trade name BAYMICRON SLURRY RED;
• 5 parts of styrene butadiene carboxylated latex (SB 230).

• 100 parties de carbonate de calcium (dénomination commerciale HYDROCARB 90) ;
• 15 parties de latex styrène acrylique (SD 215) ;
• 2 parties de stérate de calcium (NOPCOTE C 104).

Said preparation has a concentration of 30% and is then treated with an air knife coating device. 6 g / m ² of a mineral layer of the following formulation (expressed as dry matter) is deposited on the layer of microcapsules:

• 100 parts of calcium carbonate (trade name HYDROCARB 90);
• 15 parts of acrylic styrene latex (SD 215);
• 2 parts of calcium sterate (NOPCOTE C 104).

This preparation is then coated at a concentration of 35% with an air knife coating device.

The document thus obtained can be printed by any printing process such as offset, front and / or back, without altering the quality of the paper. Any information or message can be entered using a ballpoint pen (black or blue) or an impact printer.

This gives a black (or blue) print on the front and the same message is written in red on the back. It is of course possible to use other colors as needed by choosing suitable substances.

It is understood that the invention makes it possible to detect any fraud or falsification. Indeed, any attempt to erase by scratching, erasing, the original message, reveals a stain not only in the mass but also on the back, which thus reveals fraud, since the original message is written on the back and front of the document .

Furthermore, this document can be used in the form of a bundle with two sheets, the first of which constitutes the original, in the form of an embodiment such as described above for example, and a second sheet consisting of a chemical carbonless coated with a receiving layer of the CF (Coated Front) type or an autonomous carbonless.

When printing the original document and the second associated sheet, you get an original with a trace of the message in the mass and on the back of the latter in red color, and on the second sheet (constituting a double) you get an inscription also red in color.

One can also combine two sheets as described in Example 1, one below the other, with the same result.

In the application of the invention to documents of the check type, the magnetic ink codes (known by the acronym CMC7), printed on the check produced according to example 1, appear on the back of the check in red color (in the 'example described). This provides additional security to detect any attempt to delete or alter the CMC7 code.

The invention can also be applied to any document intended to be composted, stamped, or on which a seal is affixed, or in general any impression of a message or of an item of information intended to attest the authenticity of the document in question.

Finally, the printing on the back, according to the invention, of the original message, provides an additional advantage in detecting any attempt to duplicate a document by photocopying. Indeed, we know that photocopies, especially color, have faithful reproduction capacities which can lead to obtaining a double or duplicate with a strong resemblance to the original. However, the photocopies recto / verso always present, because of the limits of the technology, on the mechanical level, a shift between the copy of the verso and the copy of the recto. Thus, the use of the document of the invention makes it possible to detect this offset and therefore any attempt to photocopy in order to make a duplicate fraudulently.

Example 2

The proportions and compositions are the same as in Example 1, except that the paper is of the rubbed type, that is to say with smooth front and rough back, and the coating operations are carried out on the rough face.

The particularity of the document thus obtained, in particular compared to that of Example 1, consists in the compressibility and the damping properties of the rough face, which avoids the transfer of writing from one sheet to the other when two sheets are superimposed.

This feature can be advantageously used in the field of the security check, ticketing and labeling market. Indeed, it may be advantageous in certain cases, and in particular for certain types of products, to produce labels making it possible to attest the origin of a product and to avoid the production of false labels or the alteration of the latter.

Example 3

Starting from the conditions, formulation and composition of Example 1, 10% of vegetable charges of fine particle size, between 15 and 100 μm, are incorporated into the mass of the paper support layer.

These vegetable fillers increase the compressibility of the support paper layer, which makes it possible to protect the micro-capsules from friction, which can alter the next sheet.

By adapting the formulation of the protective layer, in particular by increasing the proportion of binder and / or by choosing binders of high hardness, it is possible, with such a backing paper, to avoid transcription on the following sheet.

Example 4

From Example 1, at least one side of the support layer is coated with a layer of microcapsules containing one or more colorless dyes and developing a blue color with the chemically modified alumina silicate based of montmorillonite, constituting the second reactive substance incorporated into the mass of the support layer.

Example 5

Starting from the formulation and composition of Example 1, the microcapsules contain a colorless dye capable of causing a reaction of green color with the reactive charges dispersed in the support layer.

Example 6

From Example 1, the microcapsules contain a substance capable of generating a black reaction with the reactive charges.

Example 7

0.200 kg of red color pigments (Sudan red 7B from BAYER) are incorporated into the paper medium during manufacture of the latter, compared to 1,000 kg of dry paper pulp. This dye is insoluble in water but soluble in other solvents. The paper is then calendered and then coated with microcapsules containing a solvent capable of dissolving said dye. A protective layer (mineral particles) is deposited.

When writing with a ballpoint pen or printing using an impact printer, an indelible mark is thus made at the location of the writing. This example corresponds to Figure 5.

Example 8

This example corresponds to the embodiment shown in FIG. 4.

• 100 kg d'amidon oxydé sec ;
• 6 kg de colorant pour chèque AS (et BASF) ;
• 3 kg de chlorostain ... ... ... (BAYER) ;
• 3 kg de jaune réactif PS (BAYER).

On a paper support produced in accordance with Example 1, colored pigments are added to the mass of paper, in accordance with Example 7, and a coating bath is deposited on the surface by means of a size press. decomposition :

• 100 kg of dry oxidized starch;
• 6 kg of dye for AS (and BASF) checks;
• 3 kg of chlorostain ... ... ... (BAYER);
• 3 kg of reactive yellow PS (BAYER).

The surface density is 5 g / m ² .

On this calendared paper, micro-capsules containing a red emission dye and a protective layer are deposited, as in Example 1.

• solvants organiques (acétate d'éthyle, essence, ...) ;
• solvants chlorés (eau de Javel) ;
• oxydo-réducteurs (permanganate de potassium, bisulfite de sodium)
• acides ;
• bases.

The product thus obtained has the advantage of detecting any falsification carried out using chemical products thanks to the colored reaction thus obtained between the pigments and the solvents of the type:

• organic solvents (ethyl acetate, petrol, ...);
• chlorinated solvents (bleach);
• redox (potassium permanganate, sodium bisulfite)
• acids;
• basics.

Example 9

On a paper support, free of optical brightener, a layer of microcapsules containing an optical brightener soluble in an oil is deposited, the layer of microcapsules being covered with a protective layer, as in Example 1.

By optical brightener is meant a product reacting to light and amplifying in particular the ultraviolet part of the radiation.

This document makes it possible to detect, by contrast, any falsification by comparing the writing on the front and back with specific lighting, of the Wood lamp type emitting ultraviolet.

Example 10

On a paper support, a layer of microcapsules is deposited (ref .: BAYMICRON WJR from BAYER) containing a colorless, colorless substance, soluble in an oil and developing, on contact with chemically modified alumina silicate based on montmorillonite, a gray coloration or slightly colored green, blue allowing a reading with all processes with infrared radiation of the type barcode reader, for example infrared laser pen.

The invention is not limited to the embodiments described and shown, and includes all variants, in particular in terms of colors and composition.

Claims (15)

Document suitable for receiving a print, of the type comprising a support layer of rigid or semi-rigid material, such as paper, and a layer (called coloring layer) disposed on at least one face of the support layer and characterized in that said layer contains a first substance capable of causing a colored reaction when it is brought into contact with a second substance, under the effect of an external pressure, the second layer being incorporated in the mass of the support layer. Document according to claim 1, characterized in that the second substance is distributed substantially uniformly throughout the thickness of the support layer. Document according to one of the preceding claims, characterized in that the first substance is placed in microcapsules capable of breaking under the effect of said pressure and thus releasing said first substance. Document according to claim 3, characterized in that the microcapsules form a layer of surface density of between 1 and 12 g / m ² , and preferably 2 and 8 g / m ² . Document according to one of the preceding claims, characterized in that it comprises at least one protective layer on the coloring layer. Document according to the preceding claim, characterized in that the protective layer comprises natural calcium carbonate for 100 parts, a dispersant for 0.5 parts and styrene butadiene latex for 15 parts. Documents according to one of the preceding claims, characterized in that the support layer is rubbed paper and in that said coloring layer is disposed on the rough side thereof. Documents according to one of the preceding claims, characterized in that the second substance has a density between 1.5 and 15 g / m ² , and preferably between 3 and 7 g / m ² . Document according to one of the preceding claims, characterized in that the reactive charge includes alumina silicate based on montmorillonite or phenolic resins or modified silicas. Documents according to one of the preceding claims, characterized in that said first substance includes one of the components from: * the lactone violet crystal (blue color), * 3 diethylamino-methyl-anilinofluorane (black color), * 3 diethylamino-methyl-anilinofluorane (red color), * 3 diethylamino-methyl-anilinofluorane (green color); Document according to one of the preceding claims, characterized in that the support layer includes a dispersion of synthetic products such as latex. Document according to one of the preceding claims, characterized in that the protective layer includes the second substance. Document according to one of the preceding claims, characterized in that the first coloring substance includes reactive dyes visible under ultraviolet and / or infrared radiation. Document suitable for receiving an impression of the type comprising a support layer of rigid or semi-rigid material, such as paper, and a layer (called coloring layer) disposed on at least one face of the support layer and characterized in that said layer contains a first substance capable of causing a colored reaction when it is brought into contact with a second substance, under the effect of an external pressure, the second layer being incorporated into the mass of the support layer, and in that the support layer has, in its mass and / or on the face of the side of said coloring layer, compressibility properties. Document according to claim 14, characterized in that the support layer is of the rubbed type and / or comprises in its mass vegetable fillers of suitable particle size.

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