EP3090880A1 - Substrat de document de valeur et document de valeur - Google Patents

Substrat de document de valeur et document de valeur Download PDF

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Publication number
EP3090880A1
EP3090880A1 EP16000945.2A EP16000945A EP3090880A1 EP 3090880 A1 EP3090880 A1 EP 3090880A1 EP 16000945 A EP16000945 A EP 16000945A EP 3090880 A1 EP3090880 A1 EP 3090880A1
Authority
EP
European Patent Office
Prior art keywords
layer
value
substrate
document
security feature
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.)
Withdrawn
Application number
EP16000945.2A
Other languages
German (de)
English (en)
Inventor
Peter Schiffmann
Christoph Mengel
Alexander Bornschlegl
Martin Imhof
Christine Traub-Mayer
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.)
Giesecke and Devrient Currency Technology GmbH
Original Assignee
Giesecke and Devrient 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 Giesecke and Devrient GmbH filed Critical Giesecke and Devrient GmbH
Publication of EP3090880A1 publication Critical patent/EP3090880A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • 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
    • B42D25/30—Identification or security features, e.g. for preventing forgery
    • B42D25/351—Translucent or partly translucent parts, e.g. windows
    • 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
    • B42D25/30—Identification or security features, e.g. for preventing forgery
    • B42D25/36—Identification or security features, e.g. for preventing forgery comprising special materials
    • B42D25/378—Special inks
    • B42D25/387—Special inks absorbing or reflecting ultraviolet light

Definitions

  • the invention relates to a value-document substrate for the production of value documents, in particular of banknotes, and a value document with the value-document substrate.
  • Securities or identity documents, or other valuables, such as branded goods are often provided with security elements for the purpose of security, which permit verification of the authenticity of the data carriers and at the same time serve as protection against unauthorized reproduction.
  • Security elements with viewing-angle-dependent effects play a special role in the authentication of authenticity since they can not be reproduced even with the most modern copiers.
  • the security elements are equipped with optically variable elements that give the viewer a different image impression under different viewing angles and, for example, show a different color or brightness impression and / or another graphic motif depending on the viewing angle.
  • the color-shift effect in such thin-film elements is based on viewing angle-dependent interference effects due to multiple reflections in the different sub-layers of the element.
  • the path difference of the light reflected at the different layers depends on the one hand on the optical thickness of a dielectric spacer layer, which determines the distance between a semi-transparent absorber layer and a reflective layer, and on the other hand varies with the respective viewing angle. Since the Path difference in the order of the wavelength of the visible light is due to extinction and amplification of certain wavelengths, an angle-dependent color impression for the viewer.
  • a suitable choice of material and thickness of the dielectric spacer layer a variety of different color shift effects can be designed.
  • pigment-like thin-film elements or interference pigments are known, which are mixed, for example, a printing ink.
  • Such interference pigments typically have a thin film structure that includes a reflective layer, a partially transparent layer, and one or more intervening dielectric spacer layers. These are based, for example, on mica, on SiO 2 or on Al 2 O 3 .
  • Such interference layers are referred to as one or more layers according to the number of dielectric layers.
  • Pigments such thin film interference layers are known for example under the name Iriodin ® (single layer) or Colorcrypt ® (multi-layer). Printing colors with multi-layer interference layer pigments are also known under the name OVI ®.
  • a subgroup of the interference pigments are pigments formed on the basis of a liquid crystal layer with a color shift effect.
  • Optically variable elements made of liquid crystal layers are mostly transparent and are known in the art (see for example the WO 2006/034780 A1 ).
  • the visual detectability of the color shift effect of a liquid crystal layer can be enhanced by means of a black background, which is produced, for example, by a black color layer as the background.
  • compositions with thermochromic pigments are used to produce an optically variable security feature.
  • an optical impression is created for the viewer, which differs from the visual impression before being exposed to heat.
  • Thermochromic inks based on encapsulated liquid crystals for example, have a first color at room temperature for the viewer on a black background and undergo a color change to a second color when exposed to temperature.
  • Leuco-Dyes are colored, e.g. black, and may change color as the temperature increases. In particular, a colored, e.g. black, leuco-dye become colorless.
  • thermochromic pigments may have significant sensitivity to UV radiation.
  • UV radiation is understood to mean electromagnetic radiation in the wavelength range of less than 380 nm, while the wavelength range from 380 nm to approximately 780 nm is referred to as "visible wavelength range”. Since daylight has some degree of UV radiation in the wavelength range of less than 380 nm, security elements or value documents with UV-sensitive, optically variable colorants are not very lightfast, i. the colorants are not resistant to UV radiation and change e.g. their color.
  • UV-A denotes a wavelength range of 380 to 315nm
  • UV-B a wavelength range of 315 to 280nm
  • UV-C a wavelength range of 280 to 200nm.
  • UV absorbers can be incorporated. Since the UV absorber is present statistically distributed in the binder and thus only a fraction of the added UV absorber protects the protected optically variable colorant from UV radiation, it is inevitable to work with high concentrations of the UV absorber. Against this background was in the EP 2 463 344 A1 proposed to protect the UV-sensitive, optically variable colorant in the form of a core-shell particle by means of a UV-radiation-absorbing shell. The encapsulation of the optically variable colorant inevitably leads to a reduction in the effective amount of colorant in the subsequent production of a printing ink, ie when introducing the core-shell particles into a binder matrix.
  • a further disadvantage is that the capsule wall for achieving the desired effect, namely a sufficient UV protection, must be sufficiently thick.
  • the relatively large particles obtained in this way can no longer be applied to a substrate to be printed by certain printing processes (for example by means of offset printing) in which the layer thickness of the applied printing ink is limited to thin layer thicknesses (eg a maximum of two micrometers). When applying the materials by screen printing, this leads to very high layer thicknesses.
  • the invention has for its object to overcome the disadvantages of the prior art.
  • the protection against counterfeiting of documents of value which contain UV-sensitive security features should be ensured in the long term.
  • a value-document substrate having on the front side a security feature which is sensitive to UV radiation is provided with a color layer which protects the security feature against ultraviolet radiation and is substantially opaque to UV radiation, in particular available by printing technology.
  • the value-document substrate itself can be based, for example, on a paper substrate. Paper contains titanium dioxide and is therefore UV absorbing.
  • the value-document substrate may further be provided on a (in particular transparent) polymer substrate, a film / paper / film composite substrate (see, for example, US Pat WO 2004/028825 A2 ) or a paper / foil / paper composite substrate (see, for example, US Pat WO 2006/066431 A1 ).
  • the central paper layer having a recess to provide in this way a see-through window area in which, for example, the UV-labile security feature can be arranged;
  • at least one of the films of the film / paper / film composite substrate can be present in the form of a film substantially impermeable to UV radiation, at least in the area of the recess in the central paper layer.
  • the two outer paper layers may each have a recess to provide in this way a see-through window area in which, for example, the UV-labile security feature can be arranged;
  • the film of the paper / film / paper composite substrate can be present in the form of a film which is substantially impermeable to UV radiation, at least in the region of the recesses in the paper layers.
  • the value-document substrate may be based on a paper substrate which has a continuous recess, wherein the continuous recess on at least one side of the paper substrate is covered by a transparent film (see, for example, US Pat WO 2011/015622 A1 );
  • the UV-labile security feature can be arranged in the region of the continuous recess, wherein in this case the transparent film covering the continuous recess is preferably present in the form of a film that is substantially impermeable to UV radiation.
  • the value-document substrate is in the form of a polymer substrate which is substantially impermeable to UV radiation at least in a partial region.
  • Polymer-based value-document substrates are known in the art.
  • the transparent polymer substrate is on both sides with an opaque, titanium dioxide-containing and therefore UV-absorbing Coating layer coated.
  • an opaque, titanium dioxide-containing and therefore UV-absorbing Coating layer coated By providing a recess in the opaque layer, a window area visible to the viewer can be created.
  • a transparent film substantially impermeable to UV radiation can be obtained, for example, by the addition of special UV absorbers.
  • Suitable UV absorbers are, for example, Tinuvin types from BASF, benzotriazoles, nanoscale TiO 2 with titanium (in particular Fe, V and / or Cr) doped titanium oxide, HALS (namely so-called "hindered amine light stabilizers").
  • Tinuvines are preferably used as UV absorbers, with Tinuvin 400 and Tinuvin 1130 being particularly preferred.
  • Suitable film or polymer substrate are, for example, polyesters, polyolefins (for example PE, PP, BOPP), polyamides or polycarbonates.
  • Polyester films in particular polyethylene terephthalate films (PET films), are preferably used.
  • the layer thickness of the film is preferably 2 to 100 micrometers, preferably 2 to 20 micrometers.
  • UV absorber With a high concentration of the UV absorber within the composition forming the UV-absorbing layer, a film provided therewith can achieve the effect of a cut-off filter, so that the UV protection is complete at a certain wavelength. Depending on the UV absorber used, the film has a yellowish coloration if the UV absorber concentrations are too high. Furthermore, the UV absorber can also be introduced into the film in the step of producing the film, for example by means of extrusion.
  • the term "UV radiation substantially impermeable film" is to be understood that the electromagnetic radiation in the wavelength range of less than 380 nm in the transmission in a Extent of at least 40%, preferably at least 80%, particularly preferably at least 90% is reduced.
  • the ultraviolet radiation protective, UV blocking, substantially impermeable ink layer may be e.g. based on a composition with special UV absorbers. Tinuvines are preferably used as UV absorbers, with Tinuvin 400 and Tinuvin 1130 being particularly preferred. In this case, the layer obtained by printing is preferably transparent.
  • the colorant layer which protects the security feature from ultraviolet radiation and which is substantially opaque to UV radiation can, according to an alternative, be a dark, in particular black, color layer.
  • the layer is preferably based on one or more of the following elements: carbon black; Magnetic pigments (e.g., pigments based on a hard iron, a soft iron, or a carbonyl iron); a mixture containing a red colored pigment, a yellow colored pigment, a blue colored pigment and a UV absorber; a mixture containing a black leuco dye and a UV absorber.
  • the ultraviolet radiation protective, UV blocking, substantially impermeable ink layer may, according to a further alternative, comprise a covering, UV absorbing coating based on e.g. Be titanium dioxide.
  • ink layer substantially impermeable to UV radiation is understood to mean that the electromagnetic radiation in the wavelength range of less than 380 nm in the transmission in a Extent of at least 40%, preferably at least 80%, particularly preferably at least 90% is reduced.
  • the value document according to the invention can be a banknote, in particular a paper banknote, a polymer banknote or a film composite banknote, a share, a bond, a certificate, a coupon, a check, a high-quality admission ticket, but also an identity card, such as a banknote Credit card, a bank card, a cash card, an authorization card, an identity card or pass personalization page.
  • a banknote in particular a paper banknote, a polymer banknote or a film composite banknote, a share, a bond, a certificate, a coupon, a check, a high-quality admission ticket
  • an identity card such as a banknote Credit card, a bank card, a cash card, an authorization card, an identity card or pass personalization page.
  • FIG. 1 shows a valuable document substrate according to the invention.
  • the substrate used is a polymer substrate 8 with opaque regions 8a and a transparent region 8b.
  • a 90 micron thick BOPP film is used, which has a coating on the basis of a UV absorber-containing composition to increase the UV-opacity especially in the transparent area 8b on its front and / or back (in the figure is the before UV protective coating not shown).
  • the UV absorbing coating can also be used at the same time serve as a primer for ink acceptance or adhesion of one or more additional print layers.
  • the polymer substrate may also contain UV absorbers extruded into the polymer.
  • the UV-absorbing coating may also contain antistatics in order to avoid sticking together of several substrates.
  • the rear side of the polymer substrate 8 is printed in the (also partially) transparent subregion 8b and in the covering region 8a with a thermochromic screen printing ink 2 based on encapsulated liquid crystals.
  • the thermochromic screen printing ink 2 is sensitive to UV radiation.
  • the area of the thermochromic screen printing ink 2 (in order to protect also the back of the thermochromic paint 2) is at least partially overprinted with a black, soot-based ink 5.
  • Carbon black is a broad-spectrum absorber with high light resistance, covering the spectrum from UV through VIS to IR.
  • the black color 5 is also overprinted with a transparent effect color 4 because of the better attractiveness.
  • the layer 4 may be based, for example, on interference pigments or on a crosslinked liquid crystal layer with a color shift effect. When looking at the back of the bill, the color shift effect of the transparent layer 4 due to the black background 5 becomes visible.
  • the thermochromic ink 2 is in the non-activated state, ie at room temperature, transparent (ie transparent on black background), so that the central, recessed area of the black layer 5 appears transparent in transmitted light when viewing the front of the banknote. In the region of the recess 9, the thermochromic paint 2 is always transparent. When the temperature increases, the color of the thermochromic screen printing ink 2 changes, for example, to a blue-green. This color change is when looking at the front of the banknote, ie through the transparent portion 8b of the polymer substrate, particularly appealing.
  • an infrared-transparent black based on a yellow, a red and a blue pigment can also be used.
  • the effect color printed above the black layer contains a blended UV absorber, or the effect pigment itself already has UV-absorbing properties.
  • an iriodin pigment is used as the effect pigment.
  • Such an iriodin pigment is based on a low refractive index support substrate, e.g. Mica or silica, or the carrier substrate is a thin glass plate.
  • the support is coated with several layers of a high refractive index material, such as titanium dioxide, ferric oxide, zirconium oxide and / or mixed oxides. If titanium dioxide is used as the high-index material, then the UV-absorbing effect already results with this material.
  • the black coating 5 is required to make the hue of the liquid crystal-based thermochromic color visible.
  • FIG. 2 shows a further inventive value-document substrate.
  • the substrate used is a polymer substrate 8 with opaque regions 8a and a transparent region 8b.
  • the polymer substrate used is a 90 .mu.m thick BOPP film which has a coating based on a UV absorber-containing composition to increase the UV impermeability, in particular in the transparent region 8b on its front and / or rear side.
  • the rear side of the polymer substrate 8 is partially printed in the transparent subregion 8b and covering region 8a with a thermochromic screen printing ink 2a based on encapsulated liquid crystals.
  • Thermochromic screen printing ink 2a is sensitive to UV radiation.
  • the polymer substrate 8 Adjacent to the region of the thermochromic screen printing ink 2a, the polymer substrate 8 is additionally printed with a non-thermochromic ink 2b which has the same or a similar color tone as the thermochromic ink 2a in the activated state at elevated temperature.
  • the region of the thermochromic screen printing ink 2a is at least partially overprinted with a black, soot-based ink 5 on the back side.
  • the black color 5 is additionally overprinted with a transparent effect color 4 to improve the optical effect.
  • the layer 4 may be based for example on interference pigments or on a liquid crystal layer with a color shift effect. When looking at the back of the bill, the color shift effect of the transparent layer 4 due to the black background 5 becomes visible.
  • thermochromic ink 2a is in the non-activated state, ie at room temperature, eg transparent.
  • the central, recessed area 9 of the black layer 5 then always appears transparent in the transmitted light when viewing the front of the banknote.
  • the color of the thermochromic screen printing ink 2a changes to a blue-green against a black background. This color change is particularly appealing when viewing the front of the banknote, ie, through the transparent portion 8b of the polymer substrate.
  • thermochromic ink layer 2b which has the same or a similar hue as the thermochromic ink 2a in the activated state at elevated temperature, a supplementary information 2a to the non-thermochromic information 2b visually noticeable when the temperature increases.
  • FIG. 3 shows a further inventive value-document substrate.
  • the substrate used is a polymer substrate 8 with opaque regions 8a and a transparent area 8b.
  • the polymer substrate used is a 90 .mu.m thick BOPP film which has a coating based on a UV absorber-containing composition to increase the UV impermeability, in particular in the transparent region 8b on its front and / or rear side.
  • the front side of the polymer substrate 8 is printed in the transparent subregion 8b with two thermochromic screen printing inks 2a, 2b, each based on encapsulated liquid crystals.
  • thermochromic screen printing inks 2a, 2b are colorless at room temperature, wherein the thermochromic paint 2b at a temperature of 25 ° C and the thermochromic paint 2a are activated at a temperature of 35 ° C, ie change their color.
  • the thermochromic screen printing inks 2a, 2b are sensitive to UV radiation.
  • the region of the thermochromic screen printing inks 2a, 2b on the back is at least partially overprinted with a black color 5 based on carbon black.
  • the black color 5 is additionally overprinted with a transparent effect color 4 to improve the optical effect.
  • the layer 4 may be based for example on interference pigments or on a liquid crystal layer with a color shift effect. When viewing the front side of the banknote, the color shift effect of the transparent layer 4 becomes visible due to the black background 5.
  • FIG. 4 shows a further inventive value-document substrate.
  • the substrate used is a polymer substrate 8 with opaque regions 8a and a transparent region 8b.
  • the polymer substrate used is a 90 .mu.m thick BOPP film which has a coating based on a UV absorber-containing composition to increase the UV impermeability, in particular in the transparent region 8b on its front and / or rear side.
  • the front side of the polymer substrate 8 is in the transparent portion 8b with a thermochromic, encapsulated liquid crystals based screen printing ink 2a printed.
  • the thermochromic screen printing ink 2a is colorless at a temperature of less than 25 ° C and has a release temperature or activation temperature of 25 ° C and is sensitive to UV radiation.
  • the polymer substrate 8 Adjacent to the region of the thermochromic screen printing ink 2a, the polymer substrate 8 is additionally printed with a non-thermochromic ink 2b which has the same or a similar color tone as the thermochromic ink 2a in the activated state at elevated temperature.
  • a non-thermochromic ink 2b Adjacent to the region of the thermochromic screen printing ink 2a, the polymer substrate 8 is additionally printed with a non-thermochromic ink 2b which has the same or a similar color tone as the thermochromic ink 2a in the activated state at elevated temperature.
  • the area of the thermochromic screen printing ink 2a is partially overprinted with a black, soot-based paint 5a.
  • a thermochromic black (and in particular UV absorber-containing) ink 5b based on so-called leuco-dyes is additionally used.
  • the black, thermochromic paint 5b is black at room temperature and has a release temperature of 35 ° C.
  • the color becomes colorless when the temperature increases, so that the thermochromic liquid-crystalline color shows no effect.
  • the black color 5a, 5b is additionally overprinted with a transparent effect color 4 to improve the optical effect.
  • the layer 4 may be based for example on interference pigments or on a liquid crystal layer with a color shift effect. When viewing the back of the banknote, the color shift effect of the transparent layer 4 becomes visible due to the black background 5a, 5b.
  • thermochromic color layers 2a, 5b visually complementary information to the non-thermochromic information 2b, 5a recognizable, the two visually complementary information 2a, 5b due to the different Tripping temperatures of the thermochromic colors used graded depending on the ambient temperature occur.
  • FIG. 5 shows a further inventive value-document substrate.
  • the substrate used is a polymer substrate 8 with opaque regions 8a and a transparent region 8b.
  • the polymer substrate used is a 90 .mu.m thick BOPP film which has a coating based on a UV absorber-containing composition to increase the UV impermeability, in particular in the transparent region 8b on its front and / or rear side.
  • the front side of the polymer substrate 8 is printed in the transparent portion 8b with a fluorescent dye 2c with sensitivity in the UV-B range and / or UV-C range.
  • the fluorescent dye 2c is excitable in the UV-A range.
  • the area of the color 2c is printed with a UV broadband protection 10.
  • the UV broadband protection 10 is based, for example, on a white or colored pigment pigmented with titanium dioxide.
  • the UV broadband protection protects against light in the UV-A, in the UV-B and UV-C range.
  • the substrate is in the region 8b such that it protects against UV radiation in the UV-B and UV-C range, ie absorbs such UV radiation.
  • the UV-A light is transmitted though.
  • an excitation of the fluorescent dye 2c can take place through the layer 8b.
  • an effect color based on a particular interference pigment is applied, which already has a UV-absorbing effect due to the presence of a high-index titanium dioxide-based layer. If the fluorescent color 2c is transparent, this effect color can be verified by placing it on a black background from both sides of the substrate. Because of the UV absorbing effect of the interference pigment, the luminescence can only be well verified from one substrate side.

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  • Credit Cards Or The Like (AREA)
  • Inspection Of Paper Currency And Valuable Securities (AREA)
  • Laminated Bodies (AREA)
EP16000945.2A 2015-04-28 2016-04-27 Substrat de document de valeur et document de valeur Withdrawn EP3090880A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102015005448.1A DE102015005448A1 (de) 2015-04-28 2015-04-28 Wertdokument-Substrat und Wertdokument

Publications (1)

Publication Number Publication Date
EP3090880A1 true EP3090880A1 (fr) 2016-11-09

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EP (1) EP3090880A1 (fr)
DE (1) DE102015005448A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2021123136A1 (fr) * 2019-12-20 2021-06-24 Oberthur Fiduciaire Sas Structure de sécurité multicouches à usage fiduciaire et document de sécurité qui en fait usage

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004028825A2 (fr) 2002-09-19 2004-04-08 Giesecke & Devrient Gmbh Papier de securite
WO2006034780A1 (fr) 2004-09-24 2006-04-06 Giesecke & Devrient Gmbh Element de securite optiquement variable
WO2006066431A1 (fr) 2004-12-23 2006-06-29 Landqart Structure multicouche servant de substrat d'impression et procede de fabrication
DE102006016048A1 (de) * 2006-04-04 2007-10-18 Giesecke & Devrient Gmbh Sicherheitselement
EP2028017A2 (fr) * 2007-08-23 2009-02-25 De La Rue International Limited Dispositifs de sécurité pour substrats sécurisés
WO2011015622A1 (fr) 2009-08-06 2011-02-10 Giesecke & Devrient Gmbh Procédé pour fabriquer un élément de sécurité et élément de sécurité pouvant être obtenu selon le procédé
EP2463344A1 (fr) 2010-12-08 2012-06-13 Giesecke & Devrient GmbH Utilisation d'un liant polymère

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004028825A2 (fr) 2002-09-19 2004-04-08 Giesecke & Devrient Gmbh Papier de securite
WO2006034780A1 (fr) 2004-09-24 2006-04-06 Giesecke & Devrient Gmbh Element de securite optiquement variable
WO2006066431A1 (fr) 2004-12-23 2006-06-29 Landqart Structure multicouche servant de substrat d'impression et procede de fabrication
DE102006016048A1 (de) * 2006-04-04 2007-10-18 Giesecke & Devrient Gmbh Sicherheitselement
EP2028017A2 (fr) * 2007-08-23 2009-02-25 De La Rue International Limited Dispositifs de sécurité pour substrats sécurisés
WO2011015622A1 (fr) 2009-08-06 2011-02-10 Giesecke & Devrient Gmbh Procédé pour fabriquer un élément de sécurité et élément de sécurité pouvant être obtenu selon le procédé
EP2463344A1 (fr) 2010-12-08 2012-06-13 Giesecke & Devrient GmbH Utilisation d'un liant polymère

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
ANGEWANDTE CHEMIE, vol. 122, 2010, pages 2 - 13

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2021123136A1 (fr) * 2019-12-20 2021-06-24 Oberthur Fiduciaire Sas Structure de sécurité multicouches à usage fiduciaire et document de sécurité qui en fait usage
FR3105087A1 (fr) * 2019-12-20 2021-06-25 Oberthur Fiduciaire Sas Structure de sécurité multicouches à usage fiduciaire et document de sécurité qui en fait usage

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