EP0243285B1 - Papier de sécurité infalsifiable et/ou authentifiable par thermochromie et son procédé de préparation - Google Patents

Papier de sécurité infalsifiable et/ou authentifiable par thermochromie et son procédé de préparation Download PDF

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Publication number
EP0243285B1
EP0243285B1 EP19870420103 EP87420103A EP0243285B1 EP 0243285 B1 EP0243285 B1 EP 0243285B1 EP 19870420103 EP19870420103 EP 19870420103 EP 87420103 A EP87420103 A EP 87420103A EP 0243285 B1 EP0243285 B1 EP 0243285B1
Authority
EP
European Patent Office
Prior art keywords
acid
paper
papers
authenticatable
compound
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
Application number
EP19870420103
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0243285A1 (fr
Inventor
André Honnorat
Claude Riou
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Aussedat Rey SA
Original Assignee
Aussedat Rey SA
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Aussedat Rey SA filed Critical Aussedat Rey SA
Publication of EP0243285A1 publication Critical patent/EP0243285A1/fr
Application granted granted Critical
Publication of EP0243285B1 publication Critical patent/EP0243285B1/fr
Expired legal-status Critical Current

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Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
    • D21H21/14—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties characterised by function or properties in or on the paper
    • D21H21/40—Agents facilitating proof of genuineness or preventing fraudulent alteration, e.g. for security paper
    • D21H21/44—Latent security elements, i.e. detectable or becoming apparent only by use of special verification or tampering devices or methods
    • D21H21/48—Elements suited for physical verification, e.g. by irradiation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
    • B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
    • B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
    • B42D25/20—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof characterised by a particular use or purpose
    • B42D25/29—Securities; Bank notes
    • 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 a security paper that cannot be forged and / or authenticated by thermochromy. It also relates to its preparation process.
  • thermochromy for the authentication of security papers has already been developed in the German patent 1 228 972 and the Austrian patent 362 658. However, these described methods used uncommon, expensive and used products delicate paper mill.
  • thermochromy in security papers from thermochromic and thermomagnetic substances as well as sophisticated test equipment. This process is not easy to use.
  • patent GB-1 507 454 relating to a document authentication method, as well as a combination of a document to be authenticated and an authentication composition.
  • the document is printed on a security paper consisting of a base paper coated with a leuco-dye precursor dye can be bastone violet crystal, an inert filler and a binder.
  • a security paper consisting of a base paper coated with a leuco-dye precursor dye can be bastone violet crystal, an inert filler and a binder.
  • This document is authenticated by marking with an authentication composition comprising a mixture of a dark pigmented ink and a solution of the acid material which reacts with the dye precursor leuco-dye.
  • This method has the drawback of giving rise to an irreversible coloring reaction and is carried out in a liquid medium, without the intervention of heat.
  • the security document is characterized in that it comprises a substrate, a first substance incorporated into the substrate or applied to it , this first substance being able to participate in a toning reaction, and a second substance applied to the substrate and capable of participating in a different toning reaction, so that, during document verification by application of at least one reagent, first and second substances change color as a result of the toning reactions.
  • the proposed technique involves the use, impractical, of a liquid reagent to be applied and leads to an irreversible coloring.
  • an invention is described making it possible to overcome the various technical and economic difficulties encountered in the use of known systems for obtaining papers which can be authenticated by thermochromy and in the implementation of the systems already proposed for making the papers tamper-proof.
  • the implementation of the present invention is easily adaptable to the production techniques of the various types of paper and it makes it possible to obtain, at will, either authentifiable papers, or tamper-proof papers, or papers being simultaneously authentifiable and tamper-proof.
  • the objective of the invention is to provide a new authenticated security paper, by simple temperature rise developing a reversible coloring allowing the paper to be restored. in its original and / or unfalsifiable state, by irreversible colored reaction, by reaction with erasable felts, bases or reducing products.
  • a water-soluble combination of crystal violet lactone (i) and an aliphatic organic acid with a short hydrocarbon chain (II) is introduced into the paper.
  • the lactone violet crystal (compound I) is a known product of formula: it is commonly used in stationery, especially in carbonless papers.
  • aliphatic organic acid with a short hydrocarbon chain (11) is meant acids having up to 6 carbon atoms, saturated or unsaturated, comprising one or more acid functions and, optionally, other substituents which may be: hydroxyl group, halogen ketone function ...
  • the quantities of crystal violet (I) and of the acid (II) to be used can, as we will see later, vary within wide proportions, giving rise to different effects, generally, the quantity of crystal violet can be the order of 0.01 to 0.2 g / m 2 of paper surface and the weight ratio of II to 1 can be between 3 and 20.
  • the papers obtained can have any fibrous composition, purely cellulosic or partly synthetic, to which can be added the conventional stationery additives, namely mineral fillers, various resistance agents, binders, resins, shading dyes, bonding products, alumina sulfate for acid bonding or pH adjustment, etc.
  • the conventional stationery additives namely mineral fillers, various resistance agents, binders, resins, shading dyes, bonding products, alumina sulfate for acid bonding or pH adjustment, etc.
  • These papers may also contain, in their mass, in the dispersed pigmentary state, one or more dyes insoluble in water but organo-soluble, so as to preserve the writings or men tions brought on these papers vis-à-vis attempts of falsification using organic solvents.
  • these papers can be watermarked or contain various devices intended to ensure recognition, such as fibers, pellets, colored and / or fluorescent particles.
  • sensitizing reagents analogous to those already used today in security papers, for example, products ensuring a modification of the appearance of the paper by contact of the latter with oxidizing reagents. These products are introduced either in aqueous solution, in which case it is necessary to ensure their retention on the fibers by direct bonding or by means of fixing agents, or in the microdispersed or pigmented precipitated state.
  • Aqueous solutions containing violet crystal (1) and an acid (II) are deposited on the surface of a paper in varying concentrations and proportions. Different effects are then obtained, according to said concentrations and proportions, which have been represented in FIGS. 1,2 and 3.
  • the coloring of the paper can be accentuated by heating, that is to say that the paper is authentifiable, the return to the initial blue background takes place fairly quickly after stopping the heat source. Due to the background coloring, the paper is not sensitive to ink erasers, bases and reducers.
  • zone B the paper is white or very slightly bluish, authenticity by heat is preserved and the reaction to the ink erasing felts, bases and reducers, is clearly perceptible.
  • the paper is authentifiable and forgery-proof.
  • the paper In area C, the paper is white and less reactive to heat. Authentication requires a higher temperature. On the other hand, the reaction to the ink erasing felts, bases and reducers, is very intense.
  • the formulation comprises a coating binder which may be, by way of indication, synthetic or natural polymers with compatible hydroxy terminations, such as starch, alcohol po-. lyvinyl and cellulose derivatives.
  • activators can be added to this composition.
  • activators can be added to this composition.
  • stabilizers can be added to this composition.
  • the authentication of the document can be carried out by thermochromy, that is to say by the appearance of a blue coloration when the paper is placed in the presence of any heating source making it possible to bring its temperature between 70 ° C. and 170 ° C in a short time (a few seconds maximum), then by the very rapid weakening (a few minutes) of the color formed when the document is brought to room temperature. The initial whiteness is then restored more slowly.
  • thermochromy that is to say by the appearance of a blue coloration when the paper is placed in the presence of any heating source making it possible to bring its temperature between 70 ° C. and 170 ° C in a short time (a few seconds maximum), then by the very rapid weakening (a few minutes) of the color formed when the document is brought to room temperature. The initial whiteness is then restored more slowly.
  • thermochromy that is to say by the appearance of a blue coloration when the paper is placed in the presence of any heating source making it possible to bring its temperature between 70 ° C. and 170 ° C in a short
  • thermochromy can be carried out manually by contact with a heating element or infrared radiation and visual recognition of the color obtained, or else using an automatic apparatus suitable for this authentication.
  • the document whose authenticity is to be checked is introduced into a machine which causes, using an appropriate device, the thermochromy of the paper: contact heating (regulated heating plate) or non-contact (hot air, IR radiation). ..).
  • the coloration obtained is read using an optical device (densitometer equipped with suitable filters), which makes it possible to reject documents which do not have the hue and the coloration density corresponding to an authentic document.
  • a paper support containing one or more dispersed organosoluble dyes by mass these products being intended to give the paper sensitivity to the solvents which can be used to falsify the paper, is deposited on the surface, by a conventional papermaking technique (sizing press, roller systems), the coating solution comprising per liter of water:
  • the white paper obtained is colored blue with the erasable felts, the reducers and the bases.
  • a clearly visible blue color forms, then quickly loses its intensity: in 10 minutes, 75% of the initial color has disappeared.
  • the instant coloring obtained with ink erasers, reducers and bases, is cyan blue.
  • the bleach leads to a brown coloring, the solvents to variable coloring depending on the solvent and the dye introduced into the mass.
  • the paper turns blue with the temperature, when it is above 80 ° C (contact time of at least 3 seconds).
  • the preferred test apparatus consists of a fan pulsing hot air at a temperature of 100 to 140 ° C to reveal the color, then blowing cold air (or ambient air) to accelerate the return to the initial whiteness of the paper.
  • the colors obtained are, for the ink erasers, the reducers, the bases and the increase in temperature of the blue, and for the bleach of the beige-brown.
  • the solvents give variable colors depending on the dyes introduced into the mass and the solvents used.
  • the paper is white and not fluorescent after facing.

Landscapes

  • Business, Economics & Management (AREA)
  • Accounting & Taxation (AREA)
  • Finance (AREA)
  • Heat Sensitive Colour Forming Recording (AREA)
  • Credit Cards Or The Like (AREA)
  • Printing Methods (AREA)
  • Color Printing (AREA)
  • Paper (AREA)
EP19870420103 1986-04-24 1987-04-21 Papier de sécurité infalsifiable et/ou authentifiable par thermochromie et son procédé de préparation Expired EP0243285B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8606144 1986-04-24
FR8606144A FR2597895B1 (fr) 1986-04-24 1986-04-24 Papier de securite infalsifiable et/ou authentifiable par thermochromie et son procede de preparation

Publications (2)

Publication Number Publication Date
EP0243285A1 EP0243285A1 (fr) 1987-10-28
EP0243285B1 true EP0243285B1 (fr) 1989-08-16

Family

ID=9334698

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19870420103 Expired EP0243285B1 (fr) 1986-04-24 1987-04-21 Papier de sécurité infalsifiable et/ou authentifiable par thermochromie et son procédé de préparation

Country Status (5)

Country Link
EP (1) EP0243285B1 (es)
DE (1) DE3760455D1 (es)
ES (1) ES2012811B3 (es)
FR (1) FR2597895B1 (es)
PT (1) PT84736B (es)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2274428B (en) * 1993-01-20 1996-08-21 Portals Security threads
DE19510974A1 (de) * 1995-03-24 1996-09-26 Drescher Geschaeftsdrucke Einlagiges Papiererzeugnis
AU6697198A (en) * 1997-03-14 1998-10-12 Georgia-Pacific Corporation Security paper
DE102009017444A1 (de) 2009-04-15 2010-10-21 Sension, Biologische Detektions- Und Schnelltestsysteme Gmbh Wärmeempfindliches Aufzeichnungsmaterial mit Sicherheitsmerkmal

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1228972B (de) * 1959-06-06 1966-11-17 Dr Karlheinz Koenig Echtheitskennzeichnung von Wertpapieren
FR2279570A1 (fr) * 1974-04-26 1976-02-20 Portals Ltd Document dont l'authenticite peut etre verifiee avec surete
GB1507454A (en) * 1975-06-19 1978-04-12 Wiggins Teape Ltd Security paper

Also Published As

Publication number Publication date
EP0243285A1 (fr) 1987-10-28
FR2597895B1 (fr) 1989-07-28
DE3760455D1 (en) 1989-09-21
ES2012811B3 (es) 1990-04-16
PT84736A (fr) 1987-05-01
PT84736B (pt) 1989-12-29
FR2597895A1 (fr) 1987-10-30

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