WO2008096223A1 - Procédé pour fabriquer du papier à motifs et composés mettant en œuvre ledit procédé - Google Patents

Procédé pour fabriquer du papier à motifs et composés mettant en œuvre ledit procédé Download PDF

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Publication number
WO2008096223A1
WO2008096223A1 PCT/IB2008/000237 IB2008000237W WO2008096223A1 WO 2008096223 A1 WO2008096223 A1 WO 2008096223A1 IB 2008000237 W IB2008000237 W IB 2008000237W WO 2008096223 A1 WO2008096223 A1 WO 2008096223A1
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WO
WIPO (PCT)
Prior art keywords
compound according
paper
compound
water
patches
Prior art date
Application number
PCT/IB2008/000237
Other languages
English (en)
Inventor
Clemente Nicolucci
Original Assignee
Lecce Pen Company Spa
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 Lecce Pen Company Spa filed Critical Lecce Pen Company Spa
Publication of WO2008096223A1 publication Critical patent/WO2008096223A1/fr

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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
    • D21H21/28—Colorants ; Pigments or opacifying agents
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
    • D21H17/20—Macromolecular organic compounds
    • D21H17/21—Macromolecular organic compounds of natural origin; Derivatives thereof
    • D21H17/24—Polysaccharides
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
    • D21H17/63—Inorganic compounds
    • D21H17/67—Water-insoluble compounds, e.g. fillers, pigments
    • 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
    • D21H21/06—Paper forming aids
    • D21H21/10—Retention agents or drainage improvers
    • 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
    • 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
    • D21H21/50—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 form
    • D21H21/52—Additives of definite length or shape

Definitions

  • the present invention concerns a special method for manufacturing industrial and/or handmade paper and cardboard with identification patterns.
  • the present invention also concerns the compounds suitable for manufacturing paper that include identification elements.
  • the paper usually manufactured both in paper machines and with handicraft techniques consists of fibrous, generally vegetable raw materials, felted together and then dried.
  • the material that is most commonly used for manufacturing paper is constituted by cellulose fibres obtained from trees or plants in general.
  • the surface of the raw paper is then covered using a range of additives that form a coat.
  • the paper and the cardboard manufactured with the method described above pose some drawbacks, especially concerning the possibility of confirming with certainty the authenticity of paper documents.
  • a drawback is due to the fact that, when common paper is used, it is often impossible to distinguish the original from a non-authorised copy. This means that non-authorised copies are largely diffused, which causes considerable economic damage, in particular to the manufacturers of fine paper.
  • a further drawback is due to the counterfeiting of paper and in particular of important paper documents concerning official deeds and issued by public bodies or in any case by certified official bodies.
  • the object of the present invention is to carry out a compound for manufacturing paper and/or cardboard containing one or more univocal identification patterns, organized in patches, that ensure the traceability of a type of paper even if they are not visible to the naked eye.
  • a further object of the present invention is to carry out a compound for the production of paper or cardboard that prevents counterfeiting of the paper or cardboard used.
  • the present invention also concerns a method for manufacturing paper that features univocal identification patterns and therefore is difficult to counterfeit.
  • the objects mentioned above are achieved by the present invention concerning a compound for the manufacture of paper or cardboard, whose main characteristics are in accordance with the contents of the first claim.
  • the objects mentioned above are also achieved by the present invention through a method for making compounds for the manufacture of paper whose main characteristics are in accordance with claim 32.
  • the compound for manufacturing paper or cardboard according to the invention ensures the traceability of the paper produced as in said paper there are patches that make up one or more anti-counterfeiting systems. Still to advantage, the compound for manufacturing paper or cardboard according to the invention offers a univocal system for identifying the manufacturer of a given type of paper.
  • the compound or mixture comprises a first solution consisting of a colloid with the addition of colouring and/or indicator substances, to which a second coagulant solution is added, wherein said second solution condenses the coloured patches into semisolid drops that can be added to the paper pulp.
  • the coloured patches can be produced in a random shape, whose size can in any case be controlled, or in a specific shape, and in this case they are also called pre-shaped patches.
  • the shape of the patches that are not pre-shaped depends on several factors, such as:
  • the pre-shaped patches can be obtained by means of a continuous or discontinuous process, according to the following instructions.
  • the colloid is dissolved into a system for processing liquids, provided with a mechanical agitation device and preferably heatable.
  • auxiliary indicator substances can a colorant and/or pigment and/or mother-of-pearl powder and/or aluminium powder and/or a fluorescent substance and/or a reacting substance and/or a correcting agent and/or a magnetizable substance and/or a chromatic substance soluble in organic solvents and/or an opacifying filler.
  • the auxiliary indicator substances are preferably selected in the forms already existing in water-compatible dispersion or solution.
  • the auxiliary indicator substances can be selected among an optical bleaching agent and/or a fluorescent substance and/or a dispersible colorant non-soluble in water, but soluble in organic solvents, and/or a substance that changes colour when in contact with specific reactive substances.
  • the reactive substances can be indicator dyes sensitive to pH (see bromocresol), sensitive to relative humidity (see cobalt chloride hexahydrate), sensitive to oxidants, to reducing agents, to gamma iron oxides, to fluorescent pigments.
  • the weight sum of the single constituent parts compared to the weight of the colloid/colloids should be included between 1 % and 100%, in order to avoid problems with printing or copying paper and cardboard that may make them less suitable for sale.
  • the colloidal system after addition of the auxiliary substances that must be thoroughly mixed together, is kept under agitation for the necessary time.
  • This time is normally included between 10 and 120 minutes, in order to obtain a good dispersion of the auxiliary substances along with the dissolution of the colloid in water.
  • the solution/dispersion containing the indicator dyes is ready for the formation of the large coagulated elements.
  • the large coloured coagulated patches can be of the type carried out continuously or discontinuously.
  • coloured patches intended to create chromatic patterns on papers having strongly coloured backgrounds, like for example black, blue, red, brown or dark green papers, before coagulation it is advisable to add to the colloidal suspension, along with the dyes and tracer substances already specified, a good opacifier like titanium dioxide, which provides a good contrast in the chromatic patterns, making them opaque and clear and eliminating any transparency effect.
  • a good opacifier like titanium dioxide, which provides a good contrast in the chromatic patterns, making them opaque and clear and eliminating any transparency effect.
  • the patch coagulation stage takes place directly in the line, but outside the paper manufacturing process, even if the patches coagulated in this way are introduced continuously at a certain point of the paper manufacturing process, that is, preferably in the so-called
  • coagulation in line is preferably achieved using a first pump to inject the chromatic solution/dispersion into a pipe that feeds a mechanical or hydraulic liquid mixer, while a second pump injects the very diluted water solution with the coagulant into the static or dynamic mixer.
  • the resulting suspension of coloured patches is conveyed to a continuous machine or to a storage tank that makes it possible to increase the contact time between the coloured patches and the coagulant solution, thus increasing its mechanical resistance.
  • the suspension of coloured patches is thus directly dispensed either into the headbox or, through a pump, preferably into the delivery pipe of the headbox of the continuous paper machine.
  • Discontinuous process Discontinuous coloured patches are obtained by adding to the solution
  • the selected coagulant for example, aluminium polychloride solution with 18% of dry material
  • the selected coagulant for example, aluminium polychloride solution with 18% of dry material
  • the introduction of the coagulant under agitation leads to the formation of coloured agglomerates that, according to the concentration of colloid, to the system agitation speed and to the speed at which the coagulant is added, generate the average size of the coagulated elements.
  • this discontinuous logic can be pre-tested in a laboratory.
  • a sample of coloured patches is collected and then added to a sample of suspension of the fibre mixture, in the proportions that will be used for manufacturing the paper containing the coloured patches, and paper sheets are made with it in the lab.
  • the chromatic pattern created by the coloured patches in the sheets made in the lab is usually and on average slightly larger than that obtained both in the manufacture of handmade paper and in the manufacture of industrial paper, since in the manufacture of industrial paper the paper pulp is subjected to strong mechanical actions that tend to divide some of the coloured patches contained in the paper pulp.
  • a concentrated solution of colloid is preferably used (for example, 5% of carboxymethylcellulose). Firstly, carboxymethylcellulose is dissolved in water under agitation, and then the identification substances, the anti-counterfeiting substances, the dyes, the pigments and the desired fillers, if any, are added to it.
  • a percentage portion of diluted coagulant is slowly added thereto (for example, 0.1% of aluminium polychloride diluted at 2%).
  • the coloured patches made in the lab have also been shaped with small injection extruders, starting from semi-condensed pre-agglomerates, and are then made discontinuous via a mechanical cutting operation at the exit of the extrusion die.
  • the drawn product is then cut using systems suitable for making very short drawn elements, for example 0,1/10 mm in size, in such a way as to obtain the desired shape.
  • a water solution diluted with coagulant is added, in such a way as to obtain the individual shaped patches separate from one another and to ensure the preservation of their shape over time.
  • These shaped coloured patches are added to the paper fibre suspension as close as possible to the feeding point of the paper machine headbox.
  • the condensation (coagulation or agglomeration) of the identification substances to be introduced in the compound for manufacturing paper takes place through a reaction between at least one colloid and one coagulant, like aluminium sulphate and/or aluminium polychloride and/or organic and/or inorganic coagulants like those used for blood coagulation.
  • one coagulant like aluminium sulphate and/or aluminium polychloride and/or organic and/or inorganic coagulants like those used for blood coagulation.
  • colloidal substances natural colloids like polysaccharides or synthetic colloids are used.
  • the best colloids are those soluble in water, which are characterised by affinity with the cellulose compound also due to the high quantity of hydroxyls that remain outside the agglomerate.
  • the mixtures of colloids have proved to be suitable for the formation of coloured patches and/or shaped coloured patches.
  • Colouring agents Inorganic and organic pigments, fluorescent substances, mica, mother-of-pearl powder, aluminium and bronze powder, acid, basic and direct dyes, natural dyes, food dyes and organic powders obtained from industrial and/or vegetable residues and excesses are recommended as colouring agents.
  • Identification agents The following have proved to be excellent identification agents, perfect for papers and cardboards: fluorescent pigments and dyes, dyes that change colour and are sensitive to pH variations, oxidants, reducing agents, temperature or humidity variations, pigments and dyes that are not soluble in water but are soluble in organic solvents, metallic salts easily identifiable with colour reagents, like iron, nickel, cobalt salts, ecc, as well as substances having well-defined specific absorption peaks, and all those substances that when in contact with colour reagents generate typical colouring.
  • This example concerns the manufacture of paper containing 0,65% of blue coloured dry patches. 150 litres of water at ambient temperature were introduced in a mechanical agitator. >
  • the addition of aluminium salt caused the coagulation of the coloured CMC, while the energy produced by the agitation fragmented the coagulated product into drops of coloured patches.
  • the suspension of blue coagulated product was screened with a wire sieve having a 3 mm mesh (space between the wires) and poured into a machine chest containing 1000 kg of fibre suspension, called paper pulp and consisting of 54,65% of whitened cellulose obtained from eucalyptus, 10% of whitened cellulose obtained from fir, 10% of calcium carbonate, 20% of wastepaper and 0,65% of dry coloured patches.
  • the manufacturing speed of the paper strip was 45 m/min.
  • EXAMPLE 2 This example concerns the manufacture of paper containing 0.75% of metallic fuchsia, iridescent and anti-counterfeiting dry coloured patches.
  • CMC carboxymethylcellulose
  • the system was kept under agitation for 10 minutes, water was added until reaching a volume of 450 litres and then the system was left under agitation for other 50 minutes, that is, until the CMC dissolved completely.
  • 50 litres of coagulant solution containing 10 litres of 18% aluminium polychloride solution were added to this solution/suspension.
  • the suspension of fuchsia coagulated product was screened with a wire sieve having a 3 mm mesh (space between the wires) and poured into a machine chest containing 1000 kg of fibre suspension, called paper pulp and consisting of 54.55% of whitened cellulose obtained from eucalyptus, 10% of whitened cellulose obtained from fir, 10% of calcium carbonate, 20% of wastepaper and 0.75% of dry coloured patches.
  • This example concerns the manufacture of paper containing 1% of metallic, iridescent and anti-counterfeitinq opaque apple green patches.
  • 150 litres of water at ambient temperature were introduced in a mechanical agitator and the water was subjected to agitation. The following was added:
  • CMC carboxymethylcellulose
  • the system was kept under agitation for 10 minutes, water was added until reaching a volume of 450 litres and then the system was kept under agitation for other 50 minutes, that is, until the CMC dissolved completely.
  • the suspension of green coagulated product was screened with a wire sieve having a 3 mm mesh (space between the wires) and poured into a machine chest containing 1000 kg of fibre suspension, called paper pulp and consisting of 54.3% of whitened cellulose obtained from eucalyptus, 10% of calcium carbonate, 20% of wastepaper and 1% of dry coloured patches.
  • a water dispersion containing 4% of diketenic synthetic bonding agent and 0.7% of cationic starch was added to the pulp described above.
  • the manufacturing speed of the paper strip was 45 m/min.
  • This example concerns the manufacture of paper containing 1.6% of metallic, iridescent and anti-counterfeiting opaque silver patches.
  • CMC carboxymethylcellulose
  • the system was kept under agitation for 10 minutes, water was added until reaching a volume of 750 litres and then the system was left under agitation for other 50 minutes, that is, until the CMC dissolved completely.
  • 80 litres of coagulant solution containing 16 litres of 18% aluminium polychloride solution were added to this solution/suspension.
  • the addition of aluminium salt caused the coagulation of the coloured CMC.
  • the suspension of silver coagulate was screened with a wire sieve having a 3 mm mesh (space between the wires) and poured into a machine chest containing 1000 kg of fibre suspension, called paper pulp and consisting of 53.7% of whitened cellulose obtained from eucalyptus, 10% of whitened cellulose obtained from fir, 10% of calcium carbonate, 20% of wastepaper and 1.6% of dry coloured patches.
  • a water dispersion containing 4% of diketenic synthetic bonding agent and 0.7% of cationic starch was added to this pulp.
  • the manufacturing speed of the paper strip was 45 m/min.
  • the composition of the pulp is illustrated in Table 1 , while the characteristics of the paper produced are illustrated in Table 2.
  • This example concerns the manufacture of paper containing 2.12% of iridescent, anti-counterfeiting, flame-like white coloured patches with shot- effects, which, according to the relative humidity of the environment, change colour shifting from light blue to pink.
  • 450 litres of water at ambient temperature were introduced in a mechanical agitator and the water was subjected to agitation. The following was added:
  • CMC carboxymethylcellulose
  • the suspension of shot-effect coagulate (pink/light blue) was screened with a wire sieve having a 3 mm mesh (space between the wires) and added into a machine chest containing 1000 kg of fibre suspension, called paper pulp.
  • the fibre suspension consisted of 53.2% of whitened cellulose obtained from eucalyptus, 10% of whitened cellulose obtained from fir, 10% of calcium carbonate, 20% of wastepaper.
  • the pulp obtained in this way was coloured with black using 5% of direct black on the pulp, and after 10 minutes of agitation 2% of aluminium polychloride was added as fixing agent. It is important to remember that the same effect can be obtained by using carbon black as an alternative to direct black.
  • the dye was kept in contact with the cellulose suspension under slight agitation for 20 minutes and then 2% of aluminium polychloride was added thereto.
  • the manufacturing speed of the paper strip was 45 m/min.
  • This example concerns the manufacture of paper containing 0.6% of transparent light blue-violet coloured patches.
  • the suspension of light blue/blue coagulate was screened with a wire sieve having a 3 mm mesh (space between the wires) and added into a machine chest containing 1000 kg of fibre suspension, called paper pulp.
  • the fibre suspension consisted of 54.7% of whitened cellulose obtained from eucalyptus, 10% of whitened cellulose obtained from fir, 10% of calcium carbonate, 20% of wastepaper.
  • the manufacturing speed of the paper strip was 45 m/min.
  • Table 1 below sums up all the elements that make up the compound described in the examples, suitable for manufacturing paper according to the invention.
  • Example 6 The paper described in Example 6, patterned with light blue/violet patches, if tested in contact with organic solvents originates, near the patches, a typical red/violet/blue halo due to the solution and diffusion of the Sudan red and blue.
  • the fluorescent yellow-orange is evidenced by Wood's light.
  • the temperature of the colloid solution, in which the coloured patches are usually generated, is usually included between 10° and 90 0 C.

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  • Paper (AREA)
  • Duplication Or Marking (AREA)

Abstract

L'invention concerne un composé pour fabriquer du papier ou du carton comprenant des éléments d'identification organisés en lots. Le composé comprend un mélange consistant en une pâte de cellulose dans de l'eau et comprenant également une solution colloïdale et/ou une dispersion colloïdale auxquelles sont ajoutées une solution et/ou une dispersion de colorants ou de réactifs colorés, et/ou des substances de marquage, comprenant au moins un colloïde. La solution et/ou dispersion colloïdale peut être condensée à l'aide d'une ou de plusieurs substances coagulantes et peut être réduite en lots comprenant des substances colorées et/ou des substances de marquage qui peuvent être dispersées dans le composé par des moyens d'agitation mécaniques.
PCT/IB2008/000237 2007-02-05 2008-02-04 Procédé pour fabriquer du papier à motifs et composés mettant en œuvre ledit procédé WO2008096223A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITVI2007A000035 2007-02-05
ITVI20070035 ITVI20070035A1 (it) 2007-02-05 2007-02-05 Metodo per realizzare carta contrassegnata e compounds realizzanti tale metodo

Publications (1)

Publication Number Publication Date
WO2008096223A1 true WO2008096223A1 (fr) 2008-08-14

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PCT/IB2008/000237 WO2008096223A1 (fr) 2007-02-05 2008-02-04 Procédé pour fabriquer du papier à motifs et composés mettant en œuvre ledit procédé

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Country Link
IT (1) ITVI20070035A1 (fr)
WO (1) WO2008096223A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113593399A (zh) * 2021-08-23 2021-11-02 中钞印制技术研究院有限公司 防伪材料、防伪材料的制作方法、防伪元件和防伪颜料
EP4290007A1 (fr) * 2022-06-09 2023-12-13 Cromatos S.r.l. Procédé de fabrication d'un papier teinté

Citations (9)

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Publication number Priority date Publication date Assignee Title
US3909348A (en) * 1973-08-21 1975-09-30 Cabot Corp Urea-formaldehyde pigmentary fillers used in paper
GB2291441A (en) * 1994-07-19 1996-01-24 Congoleum Corp Wet-forming of fibre-reinforced sheet
JPH0931897A (ja) * 1995-07-14 1997-02-04 Tokushu Paper Mfg Co Ltd 偽造防止用紙及びその製造方法
DE19621966A1 (de) * 1996-05-31 1997-12-04 Basf Ag Verwendung von natürlichen oder naturidentischen synthetischen Farbstoffen zur vorübergehenden Markierung oder Einfärbung von festen und flüssigen Materialien
US5840158A (en) * 1995-09-28 1998-11-24 Nalco Chemical Company Colloidal silica/polyelectrolyte blends for pulp and paper applications
US20030194578A1 (en) * 2001-12-20 2003-10-16 Honeywell International, Inc. Security articles comprising multi-responsive physical colorants
WO2004106633A1 (fr) * 2003-05-28 2004-12-09 Huhtamaki Molded Fiber Technology B.V. Procede de preparation d’un materiau d’emballage en pate moulee
US20040244929A1 (en) * 2003-06-03 2004-12-09 Henke Jason D. Process for producing a fade-resistant paper
WO2005105472A2 (fr) * 2004-04-30 2005-11-10 De La Rue International Limited Ameliorations apportees a des substrats contenant des dispositifs de securite

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3909348A (en) * 1973-08-21 1975-09-30 Cabot Corp Urea-formaldehyde pigmentary fillers used in paper
GB2291441A (en) * 1994-07-19 1996-01-24 Congoleum Corp Wet-forming of fibre-reinforced sheet
JPH0931897A (ja) * 1995-07-14 1997-02-04 Tokushu Paper Mfg Co Ltd 偽造防止用紙及びその製造方法
US5840158A (en) * 1995-09-28 1998-11-24 Nalco Chemical Company Colloidal silica/polyelectrolyte blends for pulp and paper applications
DE19621966A1 (de) * 1996-05-31 1997-12-04 Basf Ag Verwendung von natürlichen oder naturidentischen synthetischen Farbstoffen zur vorübergehenden Markierung oder Einfärbung von festen und flüssigen Materialien
US20030194578A1 (en) * 2001-12-20 2003-10-16 Honeywell International, Inc. Security articles comprising multi-responsive physical colorants
WO2004106633A1 (fr) * 2003-05-28 2004-12-09 Huhtamaki Molded Fiber Technology B.V. Procede de preparation d’un materiau d’emballage en pate moulee
US20040244929A1 (en) * 2003-06-03 2004-12-09 Henke Jason D. Process for producing a fade-resistant paper
WO2005105472A2 (fr) * 2004-04-30 2005-11-10 De La Rue International Limited Ameliorations apportees a des substrats contenant des dispositifs de securite

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
DATABASE WPI Week 199715, Derwent World Patents Index; AN 1997-162168, XP002483640 *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113593399A (zh) * 2021-08-23 2021-11-02 中钞印制技术研究院有限公司 防伪材料、防伪材料的制作方法、防伪元件和防伪颜料
EP4290007A1 (fr) * 2022-06-09 2023-12-13 Cromatos S.r.l. Procédé de fabrication d'un papier teinté

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Publication number Publication date
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