EP0530059B1 - System zum reversiblen Überprüfen eines Sicherheitspapiers auf Echtheit - Google Patents

System zum reversiblen Überprüfen eines Sicherheitspapiers auf Echtheit Download PDF

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Publication number
EP0530059B1
EP0530059B1 EP92401979A EP92401979A EP0530059B1 EP 0530059 B1 EP0530059 B1 EP 0530059B1 EP 92401979 A EP92401979 A EP 92401979A EP 92401979 A EP92401979 A EP 92401979A EP 0530059 B1 EP0530059 B1 EP 0530059B1
Authority
EP
European Patent Office
Prior art keywords
composition
paper
obliterating
fact
coloured
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP92401979A
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English (en)
French (fr)
Other versions
EP0530059A1 (de
Inventor
Sandrine Dubois
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.)
ArjoWiggins SAS
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ArjoWiggins SAS
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Publication date
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Publication of EP0530059A1 publication Critical patent/EP0530059A1/de
Application granted granted Critical
Publication of EP0530059B1 publication Critical patent/EP0530059B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • B41M3/142—Security printing using chemical colour-formers or chemical reactions, e.g. leuco-dye/acid, photochromes
    • 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 which can be authenticated using means forming a colored trace on the paper, this trace being erasable.
  • Various security papers are known which can be authenticated using authentication compositions. Such papers are described, for example, in European patent application EP-A-391,542, filed by WIGGINS TEAPE.
  • a security paper authentication system is described which comprises, in combination, a security paper comprising both a starch and an iodate salt and an authentication composition consisting of an acidic solution. an iodide, the system being such that when the authentication composition is applied to the authentic security paper, the iodine is generated and a characteristic amidoniode color is produced.
  • German patent DE-C-856 842 has also described a paper which contains a pH indicator, this indicator coloring differently when the paper is moistened with water having a certain pH.
  • the paper thus obtained has the initial coloring of the pH indicator. For example, if bromophenol blue is used as an indicator, the paper is yellow. If you humidify, a blue trace forms.
  • German patent DE-C-397 363 describes a process for manufacturing a security paper such as sulfur dyes, copper dyes which are introduced into the paper by treatment with alkaline agents. or reducing, a color which under the action of air disappears again, so that the initial dye is regenerated.
  • an authentication system which includes a security paper on which marks or traces can be produced using an authentication composition, the marks being erasable by a second composition.
  • An object of the invention is therefore to be able to carry out an authentication of a security paper, this authentication being non-destructive.
  • Another object of the invention is to be able to quickly check a security paper and without harming the initial appearance of the paper.
  • Another object of the invention is to obtain a reversibly authenticated security paper, this paper having a white color.
  • the paper comprises the ions of the transition metals and that the authentication composition comprises the complexing agent of these ions.
  • the complexing agent is the thiocyanate ion, used in the form of salts chosen in particular from its potassium or ammonium or sodium salts;
  • the transition metal ions are more preferably ions of copper or cobalt, in particular copper II or cobalt II, used in the form of salts such as copper chloride or sulfate, for example;
  • the erasing composition comprises a reducing agent such as sulfite or bisulfite ions.
  • the paper comprises a potassium thiocyanate
  • the authentication composition comprises a copper chloride
  • the erasing composition comprises sodium sulfite
  • the paper may contain copper chloride and the authentication composition may contain thiocyanate.
  • the complexing agent is the thiocyanate ion, used in the form of salts chosen in particular from its potassium or ammonium or sodium salts;
  • the ions transition metals are iron ions, in particular iron III, used in the form of its salts such as ferric chloride;
  • the erasing composition comprises fluoride ions.
  • the paper comprises a potassium thiocyanate
  • the authentication composition comprises ferric chloride at a pH less than or equal to 3
  • the erasure composition comprises sodium fluoride
  • the paper to be authenticated is based on cellulose fibers and / or synthetic fibers. It may optionally be a synthetic paper made from a plastic film, possibly loaded and / or coated.
  • the paper may contain other security elements (fluorescent fibers, planks, watermarks, chemical falsification reagents, etc.).
  • This paper can be suitable for many applications to combat counterfeiting (entrance tickets to cultural or sporting events, transport tickets, visas, labels in particular for valuables and / or protected by copyright, etc ).
  • the reagent contained in this paper can be introduced en masse or put on its surface by coating, impregnation or sizing or by printing. It can be put in the form of patterns.
  • the authenticating composition can advantageously be put in a felt-tip pen, an ink pen or an ink pad.
  • the erasing composition can be put in a pen.
  • a security paper is made on a FOUDRINIER type paper machine from an aqueous suspension of cellulose fibers and various agents commonly used in stationery.
  • An aqueous composition of potassium thiocyanate at 5% by dry weight is produced. This composition is deposited on the surface of the paper, for example in a size press.
  • An authentication composition is produced by placing an aqueous solution of 100 g / l of copper chloride.
  • An erasing composition is produced by placing an aqueous solution of 100 g / l of sodium sulfite.
  • a colored mark is formed which can range from gray-green to deep black depending on the quantities of each reagent brought into contact (for the quantities cited in the example give a deep black). This mark is removed by applying the composition of sodium sulfite contained for example in another felt pen.
  • the colored mark can be erased several days after its formation.
  • a paper is produced as in Example 1 treated on the surface with the same thiocyanate solution.
  • An authentication composition is produced by placing an aqueous solution of 16 g / l of ferric chloride at a pH less than or equal to 3.
  • An erasing composition is produced by placing 50 g / l of sodium fluoride in aqueous solution.
  • a paper is produced as in Example 1 in a neutral medium; the pH of the paper is around 7.
  • An authentication composition is produced by putting a weak base in aqueous solution, for example sodium carbonate.
  • An erasing composition is produced by placing a weak acid, for example acetic acid, in aqueous solution.
  • a weak acid for example acetic acid

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Credit Cards Or The Like (AREA)
  • Inspection Of Paper Currency And Valuable Securities (AREA)
  • Paper (AREA)
  • Heat Sensitive Colour Forming Recording (AREA)

Claims (10)

  1. System zur Authentifizierung eines Sicherheitspapiers, das umfaßt eine Kombination aus:
    - einem Sicherheitspapier, das ein erstes chemisches Reagens (1) enthält, das die Farbe des Papiers nicht signifikant verändert,
    - einer Authentifizierungs-Zusammensetzung, die ein zweites chemisches Reagens (2) enthält, das mit (1) ein gefärbtes Produkt bildet, und
    - einer festen oder flüssigen Zusammensetzung zur Auslöschung des gefärbten Produkts.
  2. Authentifizierungs-System nach Anspruch 1, dadurch gekennzeichnet, daß es umfaßt eine Kombination aus:
    - einem Sicherheitspapier, das ein erstes chemisches Reagens (1) enthält, das die Farbe des Papiers nicht signifikant verändert,
    - einer Zusammensetzung zur Auslöschung des gefärbten Produkts, die partiell auf der Oberfläche des Papiers angeordnet ist, zur Bildung einer desensibilisierten Zone, und
    - einer Authentifizierungs-Zusammensetzung, die ein zweites chemisches Reagens (2) enthält, das außerhalb der desensibilisierten Zone mit (1) ein gefärbtes Produkt bildet.
  3. Authentifizierungs-System nach Anspruch 1, dadurch gekennzeichnet, daß es umfaßt eine Kombination aus:
    - einem Sicherheitspapier, das als Reagens (1) einen Komplexbildner für Ionen der Übergangsmetalle enthält,
    - einer Authentifizierungs-Zusammensetzung, die als Reagens (2) Ionen von Übergangsmetallen enthält, die mit (1) einen gefärbten Komplex bilden, und
    - einer Zusammensetzung zur Auslöschung des gefärbten Komplexes.
  4. Authentifizierungs-System nach Anspruch 1, dadurch gekennzeichnet, daß es umfaßt eine Kombination aus:
    - einem Sicherheitspapier, das als Reagens (1) Ionen von Übergangsmetallen enthält,
    - einer Authentifizierungs-Zusammensetzung, die als Reagens (2) einen Komplexbildner für Ionen der Übergangsmetalle enthält, die mit (1) einen gefärbten Komplex bilden, und
    - einer Zusammensetzung zur Auslöschung des gefärbten Komplexes.
  5. Authentifizierungs-System nach den Ansprüchen 3 oder 4, dadurch gekennzeichnet, daß der Komplexbildner das Thiocyanation ist, daß die Ionen der Übergangsmetalle Kupfer- oder Kobaltionen, insbesondere Kupfer(II)- oder Kobalt(II)-Ionen sind, und daß die Auslöschungs-Zusammensetzung ein Reduktionsmittel enthält (umfaßt).
  6. Authentifizierungs-System nach Anspruch 5, dadurch gekennzeichnet, daß das Reduktionsmittel ein Sulfit- oder Bisulfition ist.
  7. Authentifizierungs-System nach einem der Ansprüche 3 bis 6, dadurch gekennzeichnet, daß das Papier Kalium- oder Ammonium- oder Natriumthiocyanat enthält, daß die Authentifizierungs-Zusammensetzung Kupfer(II)chlorid oder -sulfat enthält und daß die Auslöschungs-Zusammensetzung Natriumsulfit enthält.
  8. Authentifizierungs-System nach Anspruch 3, dadurch gekennzeichnet, daß der Komplexbildner das Thiocyanation ist, daß die Ionen der Übergangsmetalle Eisenionen, insbesondere Eisen(III)-Ionen, sind und daß die Auslöschungs-Zusammensetzung Fluoridionen enthält.
  9. Authentifizierungs-System nach einem der Ansprüche 3 oder 8, dadurch gekennzeichnet, daß das Papier Kalium- oder Ammonium- oder Natriumthiocyanat enthält, daß die Authentifizierungs-Zusammensetzung Eisen(III)chlorid (bei einem pH-Wert ≦ 3) enthält und daß die Auslöschungs-Zusammensetzung Natriumfluorid enthält.
  10. Authentifizierungs-System nach Anspruch 1, dadurch gekennzeichnet, daß es umfaßt eine Kombination aus:
    - einem Sicherheitspapier, das als Reagens (1) einen gefärbten Säure-Basen-Indikator enthält, der bei dem pH-Wert des Papiers farblos ist,
    - einer Authentifizierungs-Zusammensetzung, die als Reagens (2) entweder eine Säure oder eine Base enthält, um den Indikator in seiner gefärbten Form zu erhalten, und
    - einer festen oder flüssigen Auslöschungs-Zusammensetzung, die entweder eine Base oder eine Säure enthält, um den Indikator wieder in seiner ungefärbten Form zu erhalten.
EP92401979A 1991-07-29 1992-07-09 System zum reversiblen Überprüfen eines Sicherheitspapiers auf Echtheit Expired - Lifetime EP0530059B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9109549 1991-07-29
FR9109549A FR2679934B1 (fr) 1991-07-29 1991-07-29 Papier de securite authentifiable de facon reversible.

Publications (2)

Publication Number Publication Date
EP0530059A1 EP0530059A1 (de) 1993-03-03
EP0530059B1 true EP0530059B1 (de) 1995-09-20

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP92401979A Expired - Lifetime EP0530059B1 (de) 1991-07-29 1992-07-09 System zum reversiblen Überprüfen eines Sicherheitspapiers auf Echtheit

Country Status (5)

Country Link
EP (1) EP0530059B1 (de)
AT (1) ATE128201T1 (de)
DE (1) DE69204946T2 (de)
ES (1) ES2080465T3 (de)
FR (1) FR2679934B1 (de)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10020873A1 (de) * 2000-04-28 2001-11-08 Mitsubishi Hitec Paper Flensbu Aufzeichnungsmaterialien und Druckfarben mit temporär wirkendem Sicherheitsmerkmal
WO2004087430A1 (en) * 2003-04-02 2004-10-14 Ucb, S.A. Authentication means
US7163909B2 (en) 2004-04-23 2007-01-16 Appleton Papers Inc. Authenticity indicator
FR2907136B1 (fr) * 2006-10-12 2010-01-15 Arjowiggins Ruban de securite, feuille et document de securite le comportant et procede d'incorporation

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE397363C (de) * 1923-03-30 1924-06-20 Hugo Graefe Verfahren zur Herstellung von faelschungssicherem Wertzeichenpapier
US4618402A (en) * 1984-08-10 1986-10-21 Arjomari-Prioux Safety means, paper and document against falsification by chemical agent

Also Published As

Publication number Publication date
ATE128201T1 (de) 1995-10-15
FR2679934A1 (fr) 1993-02-05
ES2080465T3 (es) 1996-02-01
DE69204946T2 (de) 1996-03-21
EP0530059A1 (de) 1993-03-03
FR2679934B1 (fr) 1993-11-12
DE69204946D1 (de) 1995-10-26

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