EP3046774A1 - Produit de sécurité ou de valeur activable, procédé d'activation et procédé de fabrication du produit de sécurité ou de valeur - Google Patents

Produit de sécurité ou de valeur activable, procédé d'activation et procédé de fabrication du produit de sécurité ou de valeur

Info

Publication number
EP3046774A1
EP3046774A1 EP14771273.1A EP14771273A EP3046774A1 EP 3046774 A1 EP3046774 A1 EP 3046774A1 EP 14771273 A EP14771273 A EP 14771273A EP 3046774 A1 EP3046774 A1 EP 3046774A1
Authority
EP
European Patent Office
Prior art keywords
product
color particles
valuable
color
security
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.)
Granted
Application number
EP14771273.1A
Other languages
German (de)
English (en)
Other versions
EP3046774B1 (fr
Inventor
Manfred Paeschke
Olga Kulikovska
Franziska Peinze
Oliver Muth
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.)
Bundesdruckerei GmbH
Original Assignee
Bundesdruckerei GmbH
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 Bundesdruckerei GmbH filed Critical Bundesdruckerei GmbH
Publication of EP3046774A1 publication Critical patent/EP3046774A1/fr
Application granted granted Critical
Publication of EP3046774B1 publication Critical patent/EP3046774B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M5/00—Duplicating or marking methods; Sheet materials for use therein
    • B41M5/26—Thermography ; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used
    • 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
    • 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
    • B42D25/40—Manufacture
    • B42D25/405—Marking
    • B42D25/41—Marking using electromagnetic radiation
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M5/00—Duplicating or marking methods; Sheet materials for use therein
    • B41M5/26—Thermography ; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used
    • B41M5/28—Thermography ; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used using thermochromic compounds or layers containing liquid crystals, microcapsules, bleachable dyes or heat- decomposable compounds, e.g. gas- liberating
    • B41M5/287—Thermography ; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used using thermochromic compounds or layers containing liquid crystals, microcapsules, bleachable dyes or heat- decomposable compounds, e.g. gas- liberating using microcapsules or microspheres only

Definitions

  • the present invention relates to value or security products, in particular to an activatable value or security product, in particular a value or security document or security element, furthermore a method for activating the value or security product and a method for producing the value or security product.
  • a value or security document can be, for example, a personal document, in particular an identity card, or a means of payment, in particular a banknote.
  • packaging for goods is included as value or security products.
  • security or security documents use security features which serve exclusively to prove the authenticity of the products, regardless of their nature or by their user.
  • security features are, for example, mottled fibers, guilloches, the special paper of banknotes and the like.
  • Personalizing, for example, personalizing, security features also contain in coded form or in plain text information about the type of document, the user of this document or a thing to which the document is uniquely assigned. Such information may be a facial image (photograph) of the user, his personal information such as name, birthday, birthplace, signature or a personal identifier such as a membership number.
  • Another security feature that individualizes the document can be, for example, a serial number of the document or the chassis number of a motor vehicle to which the document is assigned.
  • ID documents ie documents that are assigned to a person, generally have a face image of the person as well as personal data in plain text or in a coded form.
  • ID documents In order to make identification of the person as safe as possible, it is advantageous, for example, to color-reproduce the facial image in the form of a photographic replica on the document.
  • Important for the authenticity of this personalization information is that it can not be falsified or falsified.
  • the personal data including the Face image are formed not on the surface of the document, but in the interior, since it would be necessary for the falsification or falsification in this case, the personal data to expose.
  • this security feature In order for a document not yet provided with individualizing information with such a pattern, which constitutes the individualization of the document, to be provided with the document issuing the document, this security feature must be formed inside the documentary material after the document has been produced in the above case.
  • a laser blackening method is known, in which a certain material layer within the document can be blackened by means of laser radiation, so that the body issuing the document can write the desired information with a laser beam into the otherwise finished document.
  • Such a method is described, for example, in EP 0 975 148 A1.
  • Multi-color representations are advantageous over black and white representations. Because these allow for an easier assignment, for example, to a person.
  • starting materials are kept in the interior of the document body to be individualized, which can be excited by means of a localized energy input specifically for the formation of nanoparticles of different shape and / or local concentration.
  • the different color impression and / or their different concentrations influence the color impression.
  • the starting materials may, for example, be nanoparticles whose bandgap energy is greater than the photon energy of visible light due to the size quantization effect. These nanoparticles can then be caused by a targeted introduction of energy to grow together to form larger nanoparticles and thus change their absorption spectrum due to the size quantization effect.
  • DE 10 2010 062 021 A1 further specifies a security feature for a value and / or security document that is characterized by a first pattern located in one or more first planes and a second pattern in one or more second planes is formed, wherein the second planes are arranged in front of the first pattern seen from a visible side of the document.
  • the first pattern is formed of first picture elements and the second pattern of second picture elements.
  • the second picture elements are arranged in register with the first picture elements. Only over a portion of the first picture elements is a second picture element arranged in each case.
  • the second pattern above the first pattern is for example generated in such a way that a combination of the first and the second picture elements results in a colored representation.
  • WO 2004/045857 A2 specifies a laser marking method, for example for packaging material for foodstuffs.
  • a laser-sensitive material and an ink are printed.
  • the laser-sensitive material is heated so that the ink is selectively removed or discolored.
  • labels appear in the irradiated areas.
  • the laser-sensitive material converts the irradiated laser energy into heat.
  • These may be mica particles, which may optionally be coated with metal oxide.
  • the ink can be any common ink. However, it must be suitable to be removed by heat.
  • inks based on nitrocellulose, polyvinyl butyrate, polyurethane, cellulose acetate propionate, polyvinyl chloride and polyamide or water-based inks can be used.
  • the substrate may be provided with a colored layer which is opaque to the laser radiation and which has a contrasting color to the ink applied over it. Removing the ink will reveal the underlying, contrasting layer of color, making the mark you want visible.
  • optically variable pigments in thermal printing is known from DE 602 01 439 T1 in order to make valuable or important documents more difficult to copy or imitate and to enable authentication of genuine documents.
  • a heat transfer medium in the form of a substrate which carries on at least part of a surface a coating of a thermally transferable ink comprising a binder and a plurality of discrete particles of the optically variable pigment dispersed in the binder.
  • the ink can be printed using a conventional thermal transfer printing apparatus.
  • EP 1 826 728 A2 describes a laser-markable security element for securing valuables.
  • the security element contains a laser markable feature substance with core / shell particles, wherein one of the core and shell materials absorbs the radiation of a marking laser, for example an Nd: YAG laser (1064 nm), and the other does not absorb the radiation.
  • the core may be formed by a luminescent substance having a desired luminescent behavior that is not ablatable while the sheath is ablatable by the laser.
  • the shell may be formed by an infrared absorber.
  • the core can also be ablatable and the shell can not be ablated.
  • the protective cover may for example consist of SiO x .
  • printed areas are shown with such feature substances, wherein the luminescent substance luminesces at 1500 nm, but does not absorb the Ablatierstrahlung of the marking laser.
  • the IR absorber absorbs the radiation of the marking laser. Due to the irradiation of the laser radiation, the luminescent feature substance is removed in regions in the form of a desired marking (ablated).
  • the above objects are achieved according to the present invention with the activatable value or security product, with the method for activating the value or security product and with the method for producing the value or security product.
  • the value or security product may be a value or security document or security element, i. an element which is connected, for example, with an object to be protected against counterfeiting, forgery or falsification, for example a sticker, label or the like.
  • value or security product includes, for example, a passport, identity card, driver's license or another ID card or an access control card, a vehicle registration document, vehicle registration document, visa, check, Means of payment, in particular a banknote, a check, bank, credit or cash card, customer card, health card, chip card, a company card, proof of entitlement, membership card, gift or shopping voucher, bill of lading or other proof of entitlement, tax stamp, postage stamp, ticket, ( Saint -) To identify a token, adhesive label (for example for product protection) or another ID document.
  • Such products are value or security documents.
  • a product according to the invention is also a security element to understand that has a security feature according to the present invention and that can be permanently connected to an object to be protected, such as a sticker, label or the like.
  • the product may be, for example, a smart card.
  • the security or value document may be in ID 1, ID 2, ID 3, or any other format, such as a booklet form, such as a passport-like item.
  • the value or security product for example, a laminate of several document layers, which are connected in register with the heat and under increased pressure surface. Alternatively, it can also be a single-layer product. Multi-ply products can also be produced by other means than lamination, for example by extrusion.
  • the product layers consist, for example, of a carrier material which is suitable for lamination.
  • the value or security product may be formed from a polymer selected from a group comprising polycarbonate (PC), especially bisphenol A polycarbonate, polyethylene terephthalate (PET), their derivatives such as glycol modified PET (PETG),
  • PEN Polyethylene naphthalate
  • PVC polyvinyl chloride
  • PVB polyvinyl butyral
  • PMMA Polymethyl methacrylate
  • PI polyimide
  • PVA polyvinyl alcohol
  • PS polystyrene
  • the product can also be made of several of these materials. It preferably consists of PC or PC / TPU / PC.
  • the polymers may be either filled or unfilled. In the latter case they are preferably transparent or translucent. If the polymers are filled, they are opaque.
  • the above information relates both to films to be joined together and to liquid formulations applied to a precursor, such as a protective or topcoat.
  • the product is preferably produced from 3 to 12, preferably 4 to 10, films, it being possible for the individual films to consist of the same material or of different materials.
  • Overlay layers formed in this way protect a security feature arranged underneath and / or give the document the required abrasion resistance.
  • security feature is to be understood according to the present invention, the impression acting on a viewer, which is generated by a pattern.
  • the security feature can be manufactured as part of a value or security document or a separate product (security element). The latter can be glued to the document, for example.
  • the security feature will generally only occupy part of the surface of the document.
  • the term "pattern" is to be understood as meaning a somewhat distributed distribution of elements which impart an optical impression to the human eye, preferably in a two-dimensional arrangement on one or more surfaces provide a self-contained representation, such as an image, picture element, character, in particular an alphanumeric character, a symbol, crests, a line, formula or the like.
  • a pattern in one color including black, white and / or gray, appearing unstructured area, or a multi-color area. This area can contain information, for example, by its color and therefore form an identification.
  • the visual impression mediating elements are perceptible by contrasting surface areas, the contrast by different hues, brightnesses or different
  • pattern element As far as in the description and in the claims of the present application, the term, pattern element 'is called, it is to be understood as a component / element of a pattern (pixels), wherein the pattern elements can be separated from each other or merge seamlessly into each other.
  • a pattern element serves as the smallest structural element for forming the pattern, with all pattern elements forming the pattern.
  • the patterning material may be either transparent, translucent or opaque. Furthermore, it may have a certain brightness (absorption, remission), i. it may, for example, have a blackening, gray tinting or whitening, and / or it may have a (spectral) coloring and, in turn, a certain brightness.
  • the pattern elements may have a circular (point-shaped), rectangular, square, hexagonal or even other shape and a size / diameter of, for example, 1 to 100 ⁇ m. Pattern elements can be the smallest elements of a perceptible representation to which one of the color values or color tones can be assigned in each case in a multicolor color space (for example in the CMYK color space or additive RGB color space).
  • the above-mentioned object is achieved by the activatable value or security product containing a color material containing product material. These color particles are preferably designed to cause no optically perceptible or optically barely perceptible feature prior to the activation of the value or security product.
  • the value or security product is Magnetic radiation activated by a security feature formed by the color particles is permanently visually perceptible.
  • Optical perceptibility is understood to mean that the security feature becomes visually perceptible either when illuminated with light in the visible spectral range or under other conditions, for example, by illuminating light in a different spectral range than in the visible spectral range or by generating an electric field.
  • the visually recognizable feature is then developed with activation. The activation leads to a permanent (permanent) and not only temporary change in the nature of the color particles and / or the surrounding material.
  • the color particles or the product material surrounding the color particles produce the desired visual impression after activation, for example in the form of an individualizing marking.
  • the power of the electromagnetic radiation during the activation should be so high that the color particles become visually perceptible, but preferably not so high that colorant covered by the color particles is destroyed or removed or the color particles are completely removed (ablated), so that an existing color is eliminated.
  • the above-mentioned object is achieved by the method for activating the value or security product, which contains at least one color material containing product material.
  • the color particles do not cause a visually perceptible feature before activation of the value or security product.
  • the method comprises activating the value or security product by irradiation with electromagnetic radiation so that a security feature formed by the color particles is permanently visually perceptible by the electromagnetic radiation.
  • the above-mentioned object is achieved by the method according to the invention for producing a value or security product.
  • This process comprises the following process steps:
  • unaltered color particles i.
  • Color particles that are not involved in the pattern formation are fixed, if they should not be long-term stable (fixing the activated value or security product).
  • the fixation can be effected for example by irradiation of the value or security product by means of an electromagnetic radiation which has a different photon energy (wavelength) or intensity than the electromagnetic radiation used for the activation without the previously produced optically perceptible color impression being changed.
  • the matrix in which the color particles are located are chemically changed in such a way that colorant can no longer escape from the unaltered color particles.
  • One possibility of chemical modification is to chemically crosslink the matrix.
  • the matrix contains chemical compounds which can be crosslinked.
  • the value or security product is activated, creating a visually perceptible contrast between first digits of the value or security product where the value or security product was activated and second places where the value or security product was not activated.
  • the non-activated points of the value or security product in a variant show no visually perceptible feature.
  • the security feature in another variant prior to activation may have a uniform, areal optically recognizable coloration, which can be achieved by uniform surface application of the at least one product layer with the color particles. The activation then changes the visual impression locally, so that the pattern becomes perceptible according to the invention.
  • electromagnetic radiation is used for the activation electromagnetic radiation is used.
  • This contrast can be that initially no Visible feature is present and the activation of a color is exposed or that creates a contrast between a first color at non-activated sites and a second color at activated sites.
  • the contrast is formed by the fact that the electromagnetic radiation can be used in a spatially resolved manner in order to carry out the activation in different places.
  • the contrast can be caused by different hues or color brightness.
  • electromagnetic radiation is also advantageous for this because it contains information about its energy (wavelength, modulation frequency, focal plane) that can be used to address specific color particles and to control the activation specifically therefor.
  • colorants in a color particle may initially be imperceptible or only slightly perceptible. By activating, for example, colorant can be released into / from the color particles. This release is visible to the human eye.
  • the color particles can also be activated in other ways, for example by disrupting existing interference-generating mirror planes in the color particles.
  • the color particles can be applied to a product layer or introduced into the product layer with a suitable technique, for example in an unstructured, for example flat, color doping without the target pattern already having to be formed, a blank (precursor) of the value can first be formed. or security product that does not yet contain the desired target pattern, but already the unstructured color doping.
  • the color doping can extend over the entire area or only over part of the document. This blank can be produced, for example, by laminating several product layers so that the blank already contains the unstructured color doping.
  • the electromagnetic radiation required for activation is then irradiated in a spatially resolved manner into the blank, wherein the color particles are activated or changed within the unstructured color doping at the desired locations, so that they give the intended visual impression.
  • the color particles are arranged inside the value or security product, since the electromagnetic radiation used for the activation penetrates the outer product layers, at least if they are transparent or at least one wavelength or in one spectral range at least translucent.
  • these outer electromagnetic radiation product layers that are not used for activation may be opaque.
  • the security feature formed is particularly safe against forgery or falsification.
  • colorants can be used with dyes which are arranged in a color space, as in conventional printing processes, for example, inkjet printing (inkjet), for example CMYK.
  • At least one colorant provided by the color particles can become perceptible to form the optically recognizable security feature.
  • the at least one colorant for example, can not be perceived before activation and can be perceived by the activation by means of the electromagnetic radiation.
  • the colorant may be visually perceptible prior to activation, and activation may change its appearance, forming a contrast between activated and non-activated sites.
  • the at least one colorant can be released by the activation, so that the desired optically perceptible feature is formed.
  • the color particles may also change their optically perceptible nature, for example by forming the color by diffraction or interference and altering the diffraction or interference forming structural properties of the color particles upon activation.
  • the at least one colorant may preferably be located within the color particles, more preferably within a core of the color particles (core / shell and core / shell color particles) surrounded by a shell.
  • the color particles can be damaged or destroyed in any way.
  • the color particles can be subjected to thermal energy, so that the color particles melt or at least melt their shell.
  • the color particles can also burst.
  • the shell of the color particles can also be selectively removed
  • colored particles contain, for example, a liquid dye or a (liquid) ink (dye preparation) in its interior (core).
  • the particles may burst due to direct or indirect exposure to electromagnetic radiation on the paint particles.
  • the electromagnetic radiation in the core and / or in the shell of the color particles are absorbed.
  • the dye or ink then exits or diffuses as the color particles burst into the surrounding product material and thereby stains it.
  • the dye or ink material in this case is imperceptible before bursting of the color particles or at most produces a barely perceptible uniform discoloration of the product material, by diffusing the dye or the ink into the product material a visually easily discernible local discoloration Product material that is visible to the human eye, especially because it forms a visual contrast to the surrounding material. As a result, locally colored spots form in the product material.
  • the particles or the core of core / shell color particles can be formed by at least one (solid) pigment (grain) or by another solid colored particulate material, for example a solid dye .
  • colorant particles including the pigment of the core, may be melted by the action of electromagnetic radiation.
  • the shell can be melted or otherwise destroyed or damaged, or only the core melts.
  • the molten pigment material penetrates into the surrounding product material.
  • Other solid material may, for example, diffuse into the surrounding product material. This step is supported by the thermal influence of activation.
  • the product material is colored locally by penetration or diffusion. Before activation, the color particles are not or practically imperceptible. Only by the irradiation of the electromagnetic radiation and the melting or sublimation of the pigment or other solid colorant material is the material recognizable by the staining of the product material as a colored local spot.
  • the core of the core / shell particles may also be formed by a porous material containing in the pores a coloring liquid or melt of a solid colorant. Upon activation, the coloring material exits the pores and colors the surrounding product material. As a result, the visually perceptible impression is produced at the activated position of the product material.
  • the color particles are formed exclusively by porous particles without a surrounding shell. A solid colorant contained in the pores of these color particles escapes upon activation by melting or being dissolved by means of chemical solvents.
  • the core and / or the sheath are preferred for absorbing at least part of the electromagnetic radiation in at least one spectral range, in particular in the visible and / or infrared and / or UV spectral range , educated. That is, the electromagnetic photon energy used for the activation is absorbed in the core and / or in the shell or in additional particles.
  • a thermal effect on the color particles preferably takes place directly by direct irradiation of electromagnetic energy onto the color particles by absorbing the electromagnetic radiation in the shell or in a region adjacent to the shell, for example in the core. As a result of the irradiation, the shell is heated and melts or tears, ie the color particles are revealed.
  • the core and / or the shell may contain at least one sensitizer which absorbs the electromagnetic radiation.
  • the absorption of the color particles can advantageously be tuned specifically to the radiated electromagnetic radiation, without having to make special demands on the materials of the core and the shell of the color particles with regard to their spectral sensitivity.
  • the shell or the adjacent region may contain, for example, IR-absorbing dyes which are transparent, for example in the visible spectral range.
  • color particles with different sensitizing agents, which can be used at different photon absorb electromagnetic radiation be provided so that these differently sensitized color particles can be activated with electromagnetic radiation with different photon energy.
  • the sensitizer (s) may be in the sheath and / or in the core.
  • the sensitizer (s) in the dye or in the ink or pigment or other solid colorant may be in the core and / or other component of the color particle.
  • the different sensitizing agents which selectively absorb electromagnetic radiation with different photon energies are each associated with one color particle type, the color particle types differing from colorants having different colors. As a result, the color particles can be selectively activated with colorants of different colors with electromagnetic radiation of different photon energy.
  • the core contains liquid dye or (liquid) ink.
  • the core is formed by liquid dye or (liquid) ink.
  • the core may be formed solely by the liquid dye or the ink.
  • the color particles of the value or security product according to the invention are formed in a preferred embodiment of the present invention by a core and a core surrounding the shell.
  • the at least one colorant to be incorporated into the core is presented in droplet form (liquid dye, ink) or in the form of solid particles of a pigment or other solid colorant in a dispersion and coated with a shell material, for example with Ti0 2 or with metal, for example Al, or with a colored polymer.
  • the liquid dye or the ink is dispersed, for example, in a liquid in which it is insoluble, so that minute droplets are formed, or solid particles are dispersed in a liquid to form a suspension.
  • These droplets or solid particles can be stabilized in the dispersion or emulsion, for example by means of suitable wetting agents or emulsifiers.
  • a hydrophobic material is coated with a resin by first forming an organic phase by a Mixture of one or more hydrophobic liquids and / or hydrophobic solids is formed with a self-dispersing resin, is provided and then an aqueous phase is added to this mixture, so that the resin forms therein a dispersion having particle sizes of up to 0.1 ⁇ and the hydrophobic liquid and / or the hydrophobic solid encased. If a solid is to be coated, this is first converted into the desired particle size, for example by grinding. In one example, a solid dye (cyanine blue) is mixed with a resin (polyurethane resin with terminal
  • latex particles are first functionalized with polyelectrolytes, and then TiO 2 particles are deposited thereon by bringing the latex particles into contact with a solution of (NH 4 ) 2 [TiF 6 ] and H 3 B0 3 / HCl of purely inorganic hollow spheres, the latex particles are then removed, either by calcination of the Ti0 2 layers in an air atmosphere or chemically by dissolving the
  • porous particles can also be loaded (soaked) with a liquid dye or with an ink by mixing the liquid dye or the ink or a molten one
  • porous or non-porous particles may be coated with the liquid dye or the ink or molten colorant. The particles are then sheathed.
  • the loaded porous particles can be used without wrapping for the purposes of the invention. In this case, therefore, the porous particles are not core / shell particles.
  • the liquid dye or ink or molten colorant either remains liquid in the color particles or solidifies in the core. In the latter case, he / she / it is liquid by the thermal activation (melts) or is dissolved by means of a solvent.
  • Suitable porous particles are inorganic materials such as, for example, zeolites or organic materials, such as, for example, polyurethane-based microfoams, or porous nanoparticles or inorganic microcontainers.
  • porous materials can be produced by spray pyrolysis. See, for example, Hampden-Smith, T. Kodas, S. Haubrich, M. Oljaca, R. Einhorn, D. Williams, "Novel Particulate Production Processes to Create Unique Security Materials" in: Proc.
  • core / shell particles including hollow glass particles
  • Other manufacturing methods for core / shell particles are described in D.G. Shchukin, H. Möhwald, "Self-Repairing Coatings Containing Active Nanoreservoirs", in: www.small-journal.com (small), 2007, 3, No. 6, 926-943, Wiley-VCH Verlag, Weinheim the disclosure of this publication is incorporated in full in the present application, at least in respect of the production methods described therein.
  • the liquid dye or ink can be any dye or ink which gives the desired visual impression.
  • Inks typically contain one or more dyes, solvents, optionally binders and other additives.
  • luminescent substances are to be understood as liquid dyes or dyes contained in an ink.
  • so-called diffusion dyes can be used, for example Macrolex® dyes (trade name of Lanxxess, DE), which are formed by organic dyes.
  • Usable inks are also given, for example, in DE 10 2007 059 747 A1. Therefore, the disclosure of this application is fully incorporated into the present application.
  • the core contains one or more pigment grains or particles of another solid colorant, for example a solid dye.
  • the core is formed by one or more pigmentary grains or particles of another solid colorant.
  • a microgranulate can be used, which is then coated with a shell.
  • a micro-granules of ground PC can be used, which is soaked in a dye solution.
  • OVI pigments can be used in which the optically perceptible feature is caused by the interference layers contained therein. By a slight disturbance of these layers, an optical impression produced thereby can already be changed.
  • the color particles are preferably of the nanometer or micrometer or sub-micron size, i. in the case of a substantially spherical or cubic or cuboidal particle whose diameter or main diagonal in the micrometer range, preferably in the range of 0.05 to 500 ⁇ , more preferably from 0.1 to 100 ⁇ and most preferably from 0 , 5 to 50 ⁇ .
  • the color particles may also have platelet or needle shape. Also in this case is their thickness or needle diameter in the micrometer range, preferably in the range of 0.05 to 500 ⁇ , more preferably from 0.1 to 100 ⁇ and most preferably from 0.5 to 50 ⁇ .
  • the size dimension in longitudinal extension, i. parallel to the platelet plane or needle length, is preferably 0.5 ⁇ to 500 ⁇ , preferably 1 to 100 ⁇ and most preferably 5 to 50 ⁇ .
  • these can also be indirectly (indirectly) influenced (destroyed, damaged), for example by means of chemical or thermal influencing of the color particles of other particles in the product material.
  • the product material further comprises at least one chemical substance, for example a solvent-containing capsules, ie it contains these capsules or makes them available in a different manner.
  • these solvent capsules are preferably designed to release the at least one solvent upon activation with the electromagnetic radiation by absorbing the irradiated electromagnetic radiation from the solvent capsules. Therefore, the at least one solvent is suitable for at least dissolving the color particles. so that the shell is damaged or destroyed and at least one colorant is released.
  • the solvent is in particular designed to dissolve or dissolve the shell of the color particles.
  • the color particles can also be indirectly (indirectly) influenced by thermal transfer of the energy radiated by electromagnetic radiation, in that the electromagnetic radiation strikes particles which are different from the color particles and absorb the electromagnetic radiation, for example in the infrared range, and heat thereby.
  • the heated particles then transfer this thermal energy to the color particles, which are thereby destroyed, damaged or otherwise affected.
  • this metal particles can be used, which are in close proximity to the color particles in the product material, touching them, for example.
  • the color particles are dispersed in a liquid in order to apply them in a two-dimensional arrangement to a product layer.
  • This liquid may be the one in which the colored particles are produced, or a different liquid is used, into which the colored particles are introduced / dispersed after their preparation.
  • the type of liquid is essentially determined by the type of application or introduction. If the color particles are applied to the product layer by means of ink-jet printing, for example by printing a dispersion of the color particles, the liquid must be formed with the properties required for this purpose and with the composition required for this purpose.
  • the liquid may be a binder of PC based on a geminal disubstituted
  • the color particles can be introduced into or applied to a product layer, for example, before the product layer is further processed into a valuable or security product, in particular by collating several product layers and subsequent lamination.
  • the color particles are embedded in the product material, so that the material which causes the optically perceptible feature is embedded in the product material.
  • a substrate of the value or security product for example a polymer layer (foil), including the color particles is produced, for example by extrusion.
  • an extruded film can be produced which contains color particles of one type or the color particles of several, for example three, types.
  • coextruded multilayer, for example, three-ply, films can be produced, each with a color particle type.
  • the color particles can also be applied to at least one surface of the product layers, the product layers prepared in this way then being joined to other product layers, for example laminated, so that the color particles are located in an inner plane of the valuable or security product.
  • the color particles are located in cavities within the value or security product.
  • These cavities may be pores, channels, holes, depressions, recesses or the like.
  • These cavities can be formed in a product material by laser irradiation, such as UV radiation, which decomposes / ablates the product material, such as a polymer.
  • UV radiation can be used, which decomposes the product material.
  • Suitable lasers for this purpose are, for example, excimer lasers.
  • the cavities preferably completely penetrate a product layer. Alternatively, they may also be formed by blind holes (depressions).
  • the color particles are covered by an opaque porous film or layer.
  • Color (colorant) emerging from the treated color particles penetrates through the pores / channels of the porous film and reaches its surface, which faces a viewer, and thus becomes visible.
  • At least two product layers are provided. These are then stacked in a further process step after the application of the colorant particles to at least one surface of at least two product layers and / or introduction of the colorant particles into at least one of the at least two product layers and bonded together by lamination.
  • the color particles are preferably within the value or security product, most preferably in a plane within the value or security product. Thereby Imitation, forgery or falsification of the value or security product is made much more difficult.
  • the product material is preferably formed from a polymer.
  • the product material is particularly preferably formed by PC, in particular based on bisphenol A or based on a geminally disubstituted dihydroxydiphenylcycloalkane.
  • the product material may also be formed by PET or other polymeric material.
  • the materials of the color particle dispersion and the value or security product are chemically compatible with one another. This means that they are chemically similar or identical. As a result, a delamination of the value or security product is prevented in the field of color doping.
  • the binders of a color particle dispersion and the product material of the product layer onto or into which the color particles are applied or preferably, and preferably also the product material of further product layers adjacent to this product layer, are chemically / materially identical or similar to one another , Particularly preferred is the value or security product or at least the aforementioned product layers are formed from a product material which consists at least partially of or contains PC, and the color particle dispersion preferably contains a PC binder.
  • the value or security product is formed from at least two product layers, of which at least one consists of PC or contains PC, and the color particles are on or in this at least one PC product layer from or containing a dispersion containing PC as a binder.
  • the value or security product is very particularly preferably formed from at least two product layers, of which preferably at least one consists of PC or contains PC, and the color particle dispersion contains a PC based on a geminally disubstituted dihydroxydiphenylcycloalkane (see DE 10 2007 059 747 A1 ).
  • the color particles are pixelated, that is applied in a grid to a product layer, for example by the color particles are contained in a color particle dispersion before it is collected and laminated together with other polymer films, and this dispersion screened applied to the product layer.
  • Each pixel forms a pattern element.
  • the grid can contain several types of color particles, such as color particles, each with different colorants, so that different colors can be created, such as with colorants in Basic colors such as the CMYK color space, including a black and possibly also a gray component, and / or with different sensitizers that allows activation with electromagnetic radiation with different photon energies.
  • color particles with different colorants for example in each case one base color
  • a pattern to be formed can also be created by pixelated activation.
  • the patterns may also be formed by seamlessly merging color structures.
  • the color particle dispersion can be applied to the product layer by means of any desired application technique suitable for this purpose.
  • a printing method is preferably used, for example a planographic printing method, such as the offset printing method, or a through-printing method, such as the screen printing method.
  • another application method for example a doctor blade, roller coating, injection molding, casting, transfer printing or dispensing method can also be used.
  • a digital printing method for example a transfer printing method, in particular a non-impact printing method and more particularly an ink jet printing method.
  • this is further processed with further product layers to form the activatable value or security product according to the invention.
  • a conventional lamination method can be used.
  • the value or security product may be prepared by extruding the corresponding polymeric material together with color particles.
  • the color particles are preferably arranged on the inside in the value or security product and remain there completely or at least largely integrated invisibly until they are activated.
  • the color particles are applied to one or both outer sides of the product only after the production of the value or security product and then activated.
  • the electromagnetic radiation is directed to the location of the product at which a coloring is to be produced or changed.
  • any electromagnetic radiation source can be used, such as conventional thermal radiators, for example filament lamps, discharge lamps,
  • the electromagnetic radiation is laser radiation.
  • laser radiation sources are preferred because they allow the points of the value or security product to be activated to be locally irradiated in a very simple and targeted manner.
  • an IR radiation emitting laser such as a Nd: YAG (fundamental wavelength or frequency multiplied: 1064 nm, 532 nm, 355 nm, 266 nm) or a C0 2 laser (10.6 ⁇ )
  • gas lasers for example argon and krypton ion lasers, or diode lasers can be used.
  • Excimer lasers for example F 2 : 157 nm, ArF: 193 nm, KrF: 248 nm, XeCl: 308 nm, XeF 351 nm
  • Excimer lasers can be used in the UV spectral range.
  • This pattern is formed, which is visually perceptible.
  • This pattern can be "inscribed" into the material of the valuable or security product by means of a focused beam of the radiation source by successively guiding the beam over the surface of the valuable or security product (scanning or writing method).
  • a mask which transmits radiation only in certain places (masking method), in which case a metal mask with openings corresponding to the pattern can be used
  • the resist may be printed on the value or security product in a printing process in the desired pattern, and then the value or security product is exposed through the openings in the resist Alternatively, the resist may also be photosensitive A photoresist will initially be over the entire area the O applied surface, then exposed and developed, so that free areas arise through which then the value or security product can be activated by means of electromagnetic radiation. The resist or photoresist is finally removed from the value or security product again.
  • a controllable mask for example a spatial light modulator (Space Light Modulator). This allows personalized / individual exposure masks / images to be created.
  • an arrangement with one or more laser sources, an imaging optics and a control unit is preferably used.
  • the imaging optics deflects the laser beam or beams so that they are directed to the desired locations of the product layer.
  • the laser radiation is also modulated.
  • the control unit is used to control the imaging optics, whereby both the focusing and deflection of the laser beam and its modulation (intensity) is controlled.
  • a very accurate positioning of the energy source is required. For example, since the individual pattern elements are not exactly recognizable in advance in the presence of a matrix of alternating pattern elements of different colors, for example, a recognition can first be made in order to determine the position of the pattern elements relative to one another. For this, the position of at least two pattern elements in the pattern is to be determined. For the adjustment, for example, energy is introduced into at least two pattern elements corresponding points and the color and the position of the activated pattern elements are determined by optical means. By means of these color marks, the identity and the position of all other pattern elements of the pattern can then be determined.
  • a pattern for the energy input can then be determined, according to which the points corresponding to the pattern elements are converted into colored dots.
  • the particles provided for the production of the pattern are located in the document blank on the inside.
  • the pattern can not be easily forged or falsified, because this would additionally be accessed on the inside pattern, which hardly succeed without exposing the pattern.
  • these can be applied to at least one of the surfaces of a largely finished value or security product and then coated with a protective lacquer so that they are protected against mechanical damage and against counterfeiting or falsification ,
  • a protective lacquer so that they are protected against mechanical damage and against counterfeiting or falsification
  • the color particles can initially also be applied to an intermediate carrier and from there, similar to the thermal transfer method, applied to a product layer or to the largely finished value or security product.
  • the thus formed, for example, unstructured color doping can then be activated as described above, so that the desired pattern becomes visually perceptible.
  • structures may be used For example, screened color particle dispersion on the intermediate carrier formed successively multiple times and then each transferred to a product layer.
  • the intermediate carrier in the screened arrangement After the color particle dispersion has been applied to the intermediate carrier in the screened arrangement, for example, the latter is brought into contact with the product layer, preferably the intermediate carrier and the product layer are pressed against one another. For color transfer, either the entire surface of the product layer can be brought into contact with the intermediate carrier simultaneously, or individual parts of the intermediate carrier are brought into contact with corresponding parts of the product layer one after the other.
  • pressure and heat can be exerted on the temporary composite of the intermediate carrier and the product layer.
  • the color particle dispersion can either be transferred to the intermediate carrier in a step which is completely separate from the transfer to the product position. Or both steps follow directly on each other.
  • an intermediate carrier is first provided with the color particle dispersion and then transferred to a dried state, wherein a color layer is formed.
  • one or more color particle dispersions may be applied to a tape in separate color patches to form a ribbon. This ink ribbon is then provided for use in a printing device where individual ink layer areas are transferred to the product layer to form a pattern.
  • the color particle dispersion is first applied to the intermediate carrier, possibly already in the patterning structuring, in which it is then transferred to the product layer, and immediately after the color particle dispersion is transferred to the product layer, optionally still wet in-wet, optionally also in the same device in which the intermediate carrier has been coated.
  • the value or security product provided with the formed pattern or the product layer (s) provided therewith is thermally treated.
  • the value or security product or the product layer is heated by suitable energy supply, for example in a dry oven, so that the leaked colorant further diffused or sublimated into the material of the value or security product or the product layer.
  • suitable energy supply for example in a dry oven
  • the patterns can either be applied on one side of a surface of a product layer or on both sides of both surfaces of a product layer or on several product layers intended for a value or security product, either on one side and / or on both sides.
  • the patterns may be formed by respective pattern element matrices on the product layer surfaces.
  • the pattern element matrices can each be identical. Or different types of matrices can be formed in each case, which differ, for example, in the arrangement and / or in the type of the pattern elements, for example of their color.
  • first elements of a pattern that are red upon introduction of energy on a first surface for example, first elements of a pattern that are red upon introduction of energy on a first surface, second elements of the pattern, green on introduction of energy, on a second surface, and third elements of the pattern Patterns that appear blue when introducing energy, on a third Surface are formed. At least two of these surfaces may be opposing surfaces of the same product layer.
  • the first pattern formed with the first elements, the second pattern formed with the second elements, and the third pattern formed with the third elements may each be print separations of the same overall pattern, for example the face image of a person, and be formed one above the other in registration so that they register Overall pattern result.
  • Each of these print extracts includes partial information of the information stored throughout the print image.
  • multiple patterns may be formed in different spaced-apart pattern planes in the value or security document, which are parallel to one another.
  • first color particles for example, when introducing energy red, in the volume of a first layer (foil)
  • second color particles for example, green when introducing energy, in the volume of a second layer
  • third color particles the introduction of energy
  • the color particles of different types may also be in a single layer and, for example, be distributed homogeneously therein.
  • a different color developing laser-capable film would be formed.
  • the color particles of different types are located at different levels in the document, by focusing the beam of the electromagnetic radiation on one of the planes, a targeted influencing of the color particles located there can be achieved.
  • the color particles in this plane are influenced according to the invention, while color particles in other planes are not influenced. Therefore, the color particles can be selectively addressed not only by selectively adjusting the photon energy of the electromagnetic radiation but also by adjusting the radiation power at the location of the color particles.
  • At least two types of color particle dispersions differing in different dyes and / or pigments can be formed in pattern elements in a regular arrangement on a surface of at least one product layer.
  • the pattern elements can be transferred to the product layers in a raster arrangement, for example, in the pattern elements of different colors, for example in the colors of the CMYK color space, are evenly distributed.
  • areas (pixels) of color particles of different types may alternate in a particular order.
  • a planar, in particular honeycomb, arrangement of such areas can be formed, in which, for example, alternating cyan (C), magenta (M), yellow (Y) and black (K) areas along rows.
  • C cyan
  • M magenta
  • Y yellow
  • K black
  • electromagnetic radiation is locally introduced into certain areas at the locations of a specific color predetermined by the pattern in order to obtain the desired color impression, optionally as the result of a color mixing of a plurality of pattern elements each having a specific color.
  • a pattern representing an information formed by color particles may also be applied to the surface of the product layer.
  • this pattern can then only be subsequently made perceptible, since the respective colors do not yet emerge.
  • the pattern formed with the color particles can cover the surface of the product layer over the entire surface or only partially in a field on the product layer or the entire product layer.
  • a pattern can form an identification for the value or security product, for example an individualizing, in particular personalizing, identification.
  • the identifier may be indicative of an identifier associated with the person associated with the asset or security document, such as an alphanumeric identifier, such as the name, address, date of birth, or the like in plain text, a rendition of or multiple fingerprints, a facial image, a retina, or the like.
  • the pattern may also be indicative of an object to which the document is assigned.
  • the pattern may represent an identifier for the document itself, such as the serial number of a banknote or a consecutive numbering of a vehicle registration or the like.
  • the valuable or security product is preferably produced from a polymer layer provided with the color particles, furthermore from further polymer layers, on or in which there are no color particles, and, if appropriate, outside protective coatings or protective films.
  • the protective coatings or protective films are used for outside protection against damage (scratches) and for enclosing otherwise outside mounted security features in the interior of the product to protect against tampering.
  • a diffractive film can be attached.
  • the value or security product can be produced from the document materials, in particular by lamination.
  • the product may also contain other layers of other materials, such as other polymers or paper or paperboard.
  • the lamination of PC in a hot / cold laminating press is made in a first step at 170 to 200 ° C and a pressure of 50 to 600 N / cm 2 and in a second step with cooling to about room temperature and under the same pressure.
  • the lamination of PET takes place at a higher temperature, for example at 220 ° C.
  • the polymer films typically have a thickness of from 25 to 150 ⁇ m, preferably from 50 to 100 ⁇ m.
  • the value or security product is preferably made from one or more polymer layers provided with different types of color particles.
  • the valuable or security product may have at least one further security feature which is either individualizing or not individualizing.
  • Other security features include mottled fibers, guilloches, watermarks, embossed prints, a security thread, microfilm, tilting images, holograms, optically variable pigments, luminescent colors, transmitted light register and the like.
  • the document may also comprise electronic components, for example an RFID circuit with antenna and RFID microchip, electronic display elements, LEDs, touch-sensitive sensors and the like.
  • the electronic components may be hidden between two opaque layers of the document.
  • FIG. 2 shows an arrangement for activating a value or security product according to the invention in a schematic representation
  • FIG. 3 shows a schematic cross-sectional representation of the effect of electromagnetic radiation on color particles in a security or value-added product according to the invention in a first exemplary embodiment
  • Fig. 4 is a schematic representation of line-by-line generated color areas in one
  • Fig. 5 is a schematic representation of raster generated pattern elements in one
  • FIG. 6 shows a schematic cross-sectional illustration of the effect of electromagnetic radiation on color particles in a value or security product according to the invention in a second exemplary embodiment
  • FIG. 7 shows a schematic cross-sectional illustration of the effect of electromagnetic radiation on color particles in a value or security product according to the invention in a third exemplary embodiment
  • FIG. 8 shows a schematic cross-sectional representation of the effect of electromagnetic radiation on color particles in a value or security product according to the invention in a fourth exemplary embodiment
  • FIG. 9 shows a schematic cross-sectional view of method steps for the production of a laminate, including the action of electromagnetic radiation on colored particles in the laminate, to form a value or security product according to the invention in accordance with a fifth exemplary embodiment; (a) applying color particle-containing dispersion to an intermediate carrier; (b) transferring the applied color particle dispersion from the intermediate carrier to a product layer; (c) activating the product layer after lamination; 10 shows a grid of four types of pattern elements in a schematic plan view, in which only two types of pattern elements have been activated.
  • like reference numerals designate elements having the same function or elements.
  • the embodiment of an identity card 100 shown in FIG. 1 in each case has a common format for the card, for example the format ID 1 according to ISO / IEC 7810.
  • the card may be produced as a laminate of a plurality of polymer films made of PC and / or Can consist of PE and make individual layers of the card. Some of these layers may be colored opaque with pigments, for example, to hide the card from an internal electronic device. In the following, it is assumed for the sake of simplicity that the card is formed from a polymer film as the substrate.
  • the card has a front side 101 and a back side (not shown). You can, for example, have a thickness of 800 ⁇ .
  • the card may have a plurality of security features, such as a facial image 105 of the person to whom the card is associated, a data field 107 in which, for example, data of that person are given in plain text, as well as other security features which are not shown.
  • the card 100 has a security feature 200, which has been activated in accordance with the invention, whereupon the face image 300 becomes visible.
  • a representation of the face image of the owner of the card in the form of a pattern is reproduced as representative of any differently designed identification. Other representations may be formed by any other pattern.
  • the laser activation device shown schematically in FIG. 2 is suitable for producing a multicolored pattern of pattern elements in a document blank 100.
  • the device has three lasers 2 ', 2 ", 2"', three primary mirrors 3 ', 3 ", 3"' or imaging optics (not shown), a secondary mirror 4, a control unit 5 and a computer 6.
  • the imaging optics can also be located in the beam path after the mirror 4.
  • the computer 6 stores, for example, input data, for example an image file, from which a halftone image can be formed.
  • the raw data for the programming of the control unit 5 are then generated from the halftone image.
  • the control unit in turn controls the secondary mirror 4, so that the laser beam is guided over the surface of the document blank 100 to be activated.
  • the control device also controls the lasers 2 ', 2 ", 2"' or respectively a modulator (not shown) associated with the lasers. With these modulators The intensity of the laser beams L can be individually modulated. With the data provided by the controller, the device can be controlled to create pattern elements of the pattern in the document blank.
  • the laser beams emanating from the lasers pass through the primary mirrors, then hit the secondary mirror 4 and are deflected by it onto the document blank.
  • the laser beams may be passed line by line across the document surface, with the intensity of the beams being tuned by modulation to the desired beam intensity to be formed at a location on the document surface.
  • the laser beams may, for example, be focused on the surface in order to obtain the smallest possible beam diameter.
  • the imaging optics (not shown) may be controlled so that the laser beams are focused in different positions if the color particles are at different locations / depths in the document.
  • the pattern is produced by activation of the document blank 100 by means of the lasers 2 ', 2 ", 2"' in that the laser beam L in the document blank encounters color particles, for example, at corresponding locations of the document. These are damaged or melted or uncovered or even destroyed by the action of the laser beam, so that, for example, colorant contained therein is released and thus becomes perceptible to a viewer. Before activation, the colorant is hidden in the color particles because the shell largely shields the colorant.
  • the colorant escapes to the outside, for example, when it is liquid, such as when the colorant is formed by a liquid dye or a (liquid) ink and a dye contained therein diffuses into the product material or if Although the colorant is formed by a (solid) color particle, but this melts due to the irradiation with the electromagnetic radiation of the laser and thus becomes liquid. In these cases, the liquid colorant penetrates into the surrounding document material and creates a colored spot that is easily perceived by a viewer. The effect of the electromagnetic radiation may also be to promote the diffusion of the colorant in the product material. If a solid colorant remains solid during the damage or destruction of the color particles, its color impression is also changed because it is exposed due to the removal of the shell (pelts).
  • FIG. 3 schematically shows the destruction of color particles 400 according to a first exemplary embodiment of the present invention:
  • Color particles 400 (schematically shown here: a red color particle (A) on the left and right outside, a blue color particle lying next to it (B) and a yellow color particle (C) in the middle are in a middle document layer 110 from an upper document layer 1 15 and a lower document layer 1 16 is coated, embedded and lie substantially in a plane within the document layer.
  • the color particles have been extruded together with the material of this document layer, resulting in a polymer film in which the color particles are embedded statistically evenly distributed.
  • the polymer film can be formed, for example, from PC based on bisphenol A.
  • the color particles have a core 410 and a shell (or shell) 420.
  • the core each contains a liquid dye and the shell envelops it.
  • the core of the colorant particles may be formed by porous solid particles which receive the dye in their pores, for example by zeolite particles.
  • the shell of the color particles may for example consist of a polyurethane or of Ti0 2 .
  • the material of the middle document layer can be transparent in a spectral range.
  • the upper document layer 1 15 is transparent in spectral regions of the acting laser radiation.
  • One of the outer layers 1 15 or 1 16 is additionally transparent in the visible spectral range.
  • the other outer transparent document layers are formed, for example, from PC.
  • the middle document layer and the two outer document layers are gathered to form a laminate and conventionally bonded into a monolithic block in a conventional hot / cold laminating press using high pressure and high temperature.
  • the laser beam L of the first laser 2 ' is absorbed solely in the yellow dye of the yellow color particles 400 (C) due to its wavelength.
  • a sensitizer selectively responsive to the laser radiation of the first laser 2 ' may be included either in the core 410 or in the shell 420 of the yellow color particles or both in their core and in their shell.
  • the yellow dye is released so that it penetrates into the surrounding document material and forms a yellow color spot 430 there.
  • a yellow spot forms around the destroyed color particle.
  • the color particles of the other types absorb the laser radiation of the first laser 2 'not, so that they are not destroyed. Thus, yellow pattern elements are formed.
  • the other lasers 2 ", 2" are used with different wavelengths whose electromagnetic radiation is exclusively from the red color particles or exclusively from the blue ones Color particles is absorbed.
  • the ink particles 400 in the middle document layer 1 10 respective color particles are destroyed by the laser radiation thus exclusively at the points of the document 100 and generate there a locally perceptible color impression on which the associated laser beam L unfolds its effect.
  • the spectral selectivity of the laser activation produces differently colored pattern elements at different points in the document.
  • the color point resolution of the pattern depends firstly on the laser beam cross section in the plane of the document layer in which the color particles are located and secondly on the diffusion of the exiting colorant into the surrounding document material.
  • the color patches produced by the three lasers 2 ', 2 ", 2"' may form, for example, the pattern 300 shown in FIG. 4 when the laser beams L are guided line by line over the surface of the document.
  • the lines 310 are arranged horizontally in this case and lie perpendicular to each other.
  • color areas 320 (A, B, C) alternate. For example, when writing along the uppermost line from left to right, first the red color particle (A) activating laser beam 2 "is applied, then this laser beam is faded out and the blue color particle (B) activating laser beam 2" 'is switched on.
  • FIG. 5 shows another example of the formation of a multicolor pattern 300 of different color particles (A, B, C).
  • pattern areas are formed in the form of substantially round grid areas 350, each having a color, for example, by a printing process. These areas are offset in rows 310 and in adjacent rows.
  • individual color particles are not shown. The individual areas are visually imperceptible at first, because the Paint particles are not damaged or destroyed. By the action of corresponding laser radiation L, individual ones of these areas can be activated so that they form colored pattern elements. In the present case, the activation of all the pattern elements is shown.
  • FIGS. 3, 4 assumes that within a color area 320 (A, B, C) color particles of several types are contained and optionally activated.
  • color particles of one type may be contained in a color region. If color particles of several types are contained in a color range, with appropriate activation not only sharply limited color ranges can be generated but also transitions between different colors, which are created by mixing the colors of different types of color particles. As a result, photographs for a facial image 300 can be faithfully reproduced.
  • a pattern 300 is formed. This pattern may be, for example, the face image 300 of the document owner shown in FIG. 1 in a multi-color representation.
  • FIG. 6 schematically shows a second exemplary embodiment of a value or security document 100 activated according to the invention.
  • the colorant particles 400 are formed by an optically variable colorant (OVI).
  • OMI optically variable colorant
  • the visually perceivable color impression is produced by interference layers in the material. The color impression varies with the viewing angle under which a color layer produced by means of these color particles is viewed.
  • these are mica flakes thinly coated with metal oxide, for example titanium dioxide (TiO 2 ) or iron (III) oxide (Fe 2 O 3 ) (for example Iriodin®, Merck, DE), and dispersed in a liquid ink matrix ( Color particle dispersion) are applied to a surface 1 1 1 a document layer 1 10 so that they are approximately the same orientation with respect to the platelet plane on the surface.
  • metal oxide for example titanium dioxide (TiO 2 ) or iron (III) oxide (Fe 2 O 3 ) (for example Iriodin®, Merck, DE)
  • color particle dispersion are applied to a surface 1 1 1 1 a document layer 1 10 so that they are approximately the same orientation with respect to the platelet plane on the surface.
  • Such pigment particles 400 can be applied, for example, to the surface 11 of the polymer film 110, for example from PC, by dispersing these pigment particles, for example, in a liquid (OVI: optically variable ink) and the dispersion thus prepared applied to the polymer film, for example, scrape, sprayed, poured or printed, is.
  • the liquid may contain, for example, a binder of PC, for example based on a geminally disubstituted dihydroxydiphenylcycloalkane. This binder has a high affinity for the PC of the polymer layer, so that a further polymer layer 15, likewise made of PC, which is laminated therewith, is firm and insoluble in the document layer
  • the thus prepared document sheet 1 10 can then be as described above with the other polymer films 1 15, 1 16 collected and laminated.
  • the resulting laminate is subjected to its activation a laser treatment.
  • a laser beam L By means of a laser beam L, the color particles are activated by the interference layers of the color particles 400 are thereby easily disturbed. This local perturbation causes a color contrast between untreated surface areas and treated surface area to become visually perceptible.
  • a third embodiment is shown schematically.
  • an opaque polymer film 10 made of PC for receiving colorant particles 400 is prepared.
  • the colorant particles (A, B, C) are again core / shell particles with a liquid dye forming the core 410 or with an ink, optionally incorporated into a porous particle forming the core, or with a pigment forming the core.
  • the sheath 420 may in turn be formed of polyurethane or Ti0 2 .
  • the polymer film in this case is provided with the finest continuous holes 150 into which the color particles are taken up.
  • these holes may be drilled with a laser, such as a UV-emitting laser (eg, excimer laser).
  • the holes may be arranged in a regular surface pattern, such as in rows and in adjacent rows offset from one another. Or the holes are arranged in a pattern forming a marking.
  • the holes may be arranged in the form of the € symbol.
  • the holes can be perpendicular to the surface in the polymer film or at an angle ⁇ 90 ° to the film surface
  • the thus prepared polymer layer 1 10 is then assembled with an upper document layer 1 15 and a lower document layer 1 16 and connected by lamination. As a result, the cavities containing the color particles are closed on both sides. Not shown is that unfilled hole areas can be completely filled when laminating surrounding polymeric material.
  • the colorant particles 400 are then selectively damaged or destroyed to visually create permanently perceptible color patches 430.
  • a laser beam L of the second laser 2 exclusively red dye-containing colorant particles (A) are destroyed in the present case.”
  • Color particles (C) containing only yellow dye are destroyed by means of the first laser 2 " destroys blue dye-containing colorant particles (B). Since the colorant particles were originally located in the holes 150, the color spots are also substantially limited to the hole regions, so that a predetermined pattern by the hole arrangement dictates the arrangement of the colored areas.
  • color particles 400 are embedded in a polymer film 10 together with capsules 500 which contain a solvent for the shell 420 of the color particles.
  • the colorant particles may be core / shell particles having the core 410 forming ink, forming liquid dye or pigment or with another solid colorant.
  • the solvent can be present, for example, in zeolite particles or porous nanoparticles encapsulated with a shell 510 of a polycyanoacrylate or in purely inorganic microcontainers.
  • the thus prepared polymer film is then coated with a transparent protective coating 1 15, 1 16 on both sides.
  • the color particles can be arranged with solvent capsules sensitive to respective laser radiation in regions of the document surface assigned to these particles and capsules, so that the solvent capsules of a type (A, B) destroyed by laser treatment only color particles of the corresponding type (A , B) destroy.
  • a preferred alternative to this is to apply the color particles of different types in spatially separated areas (pixelated) or bring.
  • the colorant particles and associated solvent capsules may be contained in respective holes 150 as shown in the third embodiment.
  • color particles 400 are first applied to an intermediate carrier 600 and from there to the surface 11 of an example transparent polymer film 110 ((re-) transfer method).
  • dispersions containing color particles 400 are applied in a first step, for example by rastering, to the intermediate carrier 600 (FIG. 9A).
  • a dispersion medium contained in the dispersion and also present on the intermediate carrier is not shown in FIG. 9A.
  • a heat-resistant carrier material in film form for example made of polyamide or of polyimide or of PET, can preferably be used.
  • On the carrier material there may also be a release layer on the side of the carrier on which the color particle dispersion is temporarily applied, for example a layer of crosslinked acrylic polymer.
  • the carrier material may be formed, for example, in the form of a sheet or a plate or a band.
  • an inkjet printer 700 for the purpose of applying the colorant particle dispersions, an inkjet printer 700, here schematically indicated with four print heads 710 for different colors (A, B, C, D), is used in the present case.
  • the inkjet printer for example, a matrix of print ink patterns corresponding to pattern elements can be printed on the intermediate carrier in a screened manner (see example of FIG. 10).
  • the backing may be coated with a planographic or other coating process. be printed.
  • the intermediate carrier can also be coated flat.
  • the individual colors can be applied in the latter case, for example, in separate color fields. Particularly preferred is the application of a plurality of flat color fields on a tape to form a ribbon.
  • color particles are dispersed in a color particle formulation containing as binder a PC derivative, preferably based on a geminally disubstituted dihydroxydiphenylcycloalkane.
  • binder solvent and other additives usually added to printing inks are included.
  • These dispersions are printed on the subcarrier 600 by the ink jet printer 700 with the four printheads 710 for each one of the four dispersions, wherein patterns in the size and arrangement of the pattern elements 350 (FIG. 10) to be formed on the surface of a PC laminate are formed ) are formed.
  • the size of the pattern elements is for example 30 ⁇ .
  • a grid is formed from which a pattern element arrangement, such as that shown in Fig. 10, can be generated.
  • the polymer film may be, for example, a laminated PC card.
  • the PC film is pressed against the intermediate carrier. This results in a grid arrangement of the printing ink structures with the four different dispersions on the polymer film surface.
  • the intermediate carrier is not provided with a screened but with a flat color particle layer, provision may be made for the intermediate carrier to be brought into contact only in regions with the surface of the polymer film in order to form color particle layer regions in some areas.
  • the ink structures are white to gray because of the use of Ti0 2 as the shell material and have none recognizable coloring on. A viewer sees a pressure field in which the ink structures lie, because of their small size therefore at most pale gray. After the transfer of the color particles on the polymer film, the intermediate carrier is lifted from this again.
  • the thus printed PC film or PC card 1 10 can then be combined with other polymer films, such as PC or PET films, to form a stack, for example with a polymer layer 1 15. It is advantageous, the printed surface 1 1 1 to arrange the PC film inside the stack, so that the color particles 400 are arranged inside the stack.
  • the stack can then be further processed in a conventional hot / cold lamination process into a laminate which, when completed, constitutes an activatable value or security document (document blank) 100.
  • the ink patterns are preserved during lamination, i. the dye does not diffuse out.
  • the pattern elements are treated with a focused laser beam L (FIG. 9C).
  • a focused laser beam L L
  • the arrangement shown in Fig. 2 is used. Again, it is shown that the laser beam destroys a yellow (C) colorant 400 so that yellow dye contained therein leaks out and forms a yellow color patch 430. Other color particles are not damaged by this laser beam.
  • This process step can be directly followed by the process step of transferring the structures to the surface of the PC laminate or can be carried out in a significantly later time step.
  • the transmission and the activation can be carried out in the same device, while the two method steps in the second case are typically carried out in separate devices. For example, in this case, a surface coated with the color particles band can be used.
  • first (top) row are type A (red) and type B (blue) ink patterns, and in a second row underneath offset from the first row, type C (yellow) ink patterns and ink patterns of type D (green).
  • the further rows down represent repetitions of the first and the second row.
  • red and blue patterns 350 By selective activation in an upper print area 130 of type B (blue) ink patterns and in a lower print area 140 of type A (red) ink patterns, forming red and blue patterns 350, the print area 160 appears blue at the top and red at the bottom.
  • These two strips represent a pattern 300 that may represent information, such as the encoded value of a patterned document.
  • other, in particular more complicated patterns, such as a person's facial image can be developed by activating corresponding pattern elements in certain areas. Accordingly, such a pattern can also be individualizing for a value or security document 100.
  • pattern element A: red, B: blue, C: yellow, D: green
  • print head (A: red, B: blue, C: yellow, D: green)

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Finance (AREA)
  • Accounting & Taxation (AREA)
  • Optics & Photonics (AREA)
  • Health & Medical Sciences (AREA)
  • Business, Economics & Management (AREA)
  • General Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Inks, Pencil-Leads, Or Crayons (AREA)
  • Credit Cards Or The Like (AREA)

Abstract

Selon l'invention, pour créer des motifs (300) à l'intérieur d'un produit de sécurité ou de valeur, un produit de sécurité ou de valeur activable (100) contient une matière contenant une particule de couleur (400). Le produit de sécurité ou de valeur (100) peut être activé en permanence par un rayonnement électromagnétique L de façon à faire apparaître visuellement une caractéristique de sécurité (200) formée par la particule de couleur (400).
EP14771273.1A 2013-09-18 2014-09-17 Produit de sécurité ou de valeur activable, procédé d'activation et procédé de fabrication du produit de sécurité ou de valeur Active EP3046774B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102013218752.1A DE102013218752B4 (de) 2013-09-18 2013-09-18 Aktivierbares Wert- oder Sicherheitsprodukt, Verfahren zum Aktivieren und Verfahren zum Herstellen des Wert- oder Sicherheitsproduktes
PCT/EP2014/069785 WO2015040053A1 (fr) 2013-09-18 2014-09-17 Produit de sécurité ou de valeur activable, procédé d'activation et procédé de fabrication du produit de sécurité ou de valeur

Publications (2)

Publication Number Publication Date
EP3046774A1 true EP3046774A1 (fr) 2016-07-27
EP3046774B1 EP3046774B1 (fr) 2024-02-14

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EP (1) EP3046774B1 (fr)
DE (1) DE102013218752B4 (fr)
WO (1) WO2015040053A1 (fr)

Families Citing this family (1)

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Publication number Priority date Publication date Assignee Title
DE102013218751A1 (de) * 2013-09-18 2015-03-19 Bundesdruckerei Gmbh Verfahren zum Herstellen eines Sicherheitsmerkmals eines Wert- oder Sicherheitsprodukts sowie Verfahren zum Herstellen eines derartigen Produkts

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0279104A1 (fr) * 1987-02-06 1988-08-24 Seiko Instruments Inc. Matériel produisant une image

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE69102531T2 (de) 1991-03-28 1994-09-29 Dainippon Ink & Chemicals Mikrokapseln, Verkapselungsverfahren und Methode zur Anwendung derselben.
ES2281921T3 (es) 1998-07-20 2007-10-01 Maurer Electronics Gmbh Procedimiento para grabar imagenes mediante radiacion en una capa radiosensible, en especial para grabar con laser.
GB0113117D0 (en) 2001-05-31 2001-07-18 Ici Plc Improvements in or relating to thermal transfer printing
GB0226597D0 (en) 2002-11-14 2002-12-24 Sun Chemical Bv Laser marking process
DE102006008247A1 (de) 2006-02-22 2007-08-23 Giesecke & Devrient Gmbh Lasermarkierbares Sicherheitselement
DE102007037981A1 (de) 2007-08-10 2009-02-26 Bundesdruckerei Gmbh Farbige Sicherheitsdokumentindividualisierung
DE102007059747A1 (de) 2007-12-07 2009-06-10 Bundesdruckerei Gmbh Polymerschichtverbund für ein Sicherheits- und/oder Wertdokument
FR2943074B1 (fr) * 2009-03-13 2011-05-20 Arjowiggins Security Substrat marquable au laser et procede de fabrication associe
KR101049800B1 (ko) 2009-11-27 2011-07-15 삼성모바일디스플레이주식회사 유기 발광 조명 장치
EP2603385B1 (fr) * 2011-09-20 2014-03-19 U-NICA Technology AG Procédé et dispositif de production d'images colorées sur des substrats comportant des corps colorés et produits ainsi fabriqués

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0279104A1 (fr) * 1987-02-06 1988-08-24 Seiko Instruments Inc. Matériel produisant une image

Also Published As

Publication number Publication date
WO2015040053A1 (fr) 2015-03-26
EP3046774B1 (fr) 2024-02-14
DE102013218752B4 (de) 2021-01-28
DE102013218752A1 (de) 2015-03-19

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