EP1716007A1 - Tamper-proof, color-shift security feature - Google Patents
Tamper-proof, color-shift security featureInfo
- Publication number
- EP1716007A1 EP1716007A1 EP05715300A EP05715300A EP1716007A1 EP 1716007 A1 EP1716007 A1 EP 1716007A1 EP 05715300 A EP05715300 A EP 05715300A EP 05715300 A EP05715300 A EP 05715300A EP 1716007 A1 EP1716007 A1 EP 1716007A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- layer
- security feature
- counterfeit
- feature according
- proof
- 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
Links
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- JOYRKODLDBILNP-UHFFFAOYSA-N Ethyl urethane Chemical compound CCOC(N)=O JOYRKODLDBILNP-UHFFFAOYSA-N 0.000 description 4
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 4
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- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 4
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- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 4
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- RSWGJHLUYNHPMX-UHFFFAOYSA-N Abietic-Saeure Natural products C12CCC(C(C)C)=CC2=CCC2C1(C)CCCC2(C)C(O)=O RSWGJHLUYNHPMX-UHFFFAOYSA-N 0.000 description 2
- 239000004593 Epoxy Substances 0.000 description 2
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- KHPCPRHQVVSZAH-HUOMCSJISA-N Rosin Natural products O(C/C=C/c1ccccc1)[C@H]1[C@H](O)[C@@H](O)[C@@H](O)[C@@H](CO)O1 KHPCPRHQVVSZAH-HUOMCSJISA-N 0.000 description 2
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 2
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- 229910052715 tantalum Inorganic materials 0.000 description 2
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- 150000003568 thioethers Chemical class 0.000 description 2
- KHPCPRHQVVSZAH-UHFFFAOYSA-N trans-cinnamyl beta-D-glucopyranoside Natural products OC1C(O)C(O)C(CO)OC1OCC=CC1=CC=CC=C1 KHPCPRHQVVSZAH-UHFFFAOYSA-N 0.000 description 2
- 238000007740 vapor deposition Methods 0.000 description 2
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- 229910004298 SiO 2 Inorganic materials 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 229910006404 SnO 2 Inorganic materials 0.000 description 1
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- JRBRVDCKNXZZGH-UHFFFAOYSA-N alumane;copper Chemical compound [AlH3].[Cu] JRBRVDCKNXZZGH-UHFFFAOYSA-N 0.000 description 1
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- JUPQTSLXMOCDHR-UHFFFAOYSA-N benzene-1,4-diol;bis(4-fluorophenyl)methanone Chemical compound OC1=CC=C(O)C=C1.C1=CC(F)=CC=C1C(=O)C1=CC=C(F)C=C1 JUPQTSLXMOCDHR-UHFFFAOYSA-N 0.000 description 1
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- TVZPLCNGKSPOJA-UHFFFAOYSA-N copper zinc Chemical compound [Cu].[Zn] TVZPLCNGKSPOJA-UHFFFAOYSA-N 0.000 description 1
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- YQGOJNYOYNNSMM-UHFFFAOYSA-N eosin Chemical compound [Na+].OC(=O)C1=CC=CC=C1C1=C2C=C(Br)C(=O)C(Br)=C2OC2=C(Br)C(O)=C(Br)C=C21 YQGOJNYOYNNSMM-UHFFFAOYSA-N 0.000 description 1
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- 229910052732 germanium Inorganic materials 0.000 description 1
- GNPVGFCGXDBREM-UHFFFAOYSA-N germanium atom Chemical compound [Ge] GNPVGFCGXDBREM-UHFFFAOYSA-N 0.000 description 1
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 229910000859 α-Fe Inorganic materials 0.000 description 1
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
- B42D25/40—Manufacture
- B42D25/45—Associating two or more layers
- B42D25/465—Associating two or more layers using chemicals or adhesives
- B42D25/47—Associating two or more layers using chemicals or adhesives using adhesives
-
- 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
-
- 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
- B42D25/324—Reliefs
-
- 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
-
- 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
- B42D25/373—Metallic materials
-
- 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
- B42D25/43—Marking by removal of material
- B42D25/435—Marking by removal of material using electromagnetic radiation, e.g. laser
-
- B42D2033/10—
-
- B42D2035/24—
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
- Y10T428/24802—Discontinuous or differential coating, impregnation or bond [e.g., artwork, printing, retouched photograph, etc.]
Definitions
- the invention relates to tamper-proof security features that have a color shift effect caused by metallic clusters that are separated from a mirror layer by a defined transparent layer.
- the object of the invention is to provide a security feature with a color shift effect, the security feature should have additional security levels.
- the invention therefore relates to a tamper-proof security feature, each consisting of at least one layer reflecting electromagnetic waves, a polymeric spacer layer and a layer formed by metallic clusters, characterized in that one or more of the layers perform additional security functions in addition to their function in the color-shift effect setup.
- Flexible plastic films for example made of PI, PP, MOPP, PE, PPS, PEEK, PEK, PEI, PSU, PAEK, LCP, PEN, PBT, PET, PA, PC, COC, POM, ABS, PVC, are preferably suitable as the carrier substrate ,
- the carrier films preferably have a thickness of 5 to 700 ⁇ m, preferably 8 to 200 ⁇ m, particularly preferably 12 to 50 ⁇ m.
- the foils can be clear or matt (especially matt printed). The scatter on matt foils causes a significant change, particularly in the intensity in the color spectrum, so that a different color code is created than with clear foils.
- metal foils for example Al, Cu, Sn, Ni, Fe or stainless steel foils with a thickness of 5-200 ⁇ m, preferably 10 to 80 ⁇ m, particularly preferably 20-50 ⁇ m, can also serve as the carrier substrate.
- the films can also be surface-treated, coated or laminated, for example with plastics, or painted.
- the carrier substrates also cellulose-free or cellulose-containing paper
- ther ooxidierbares paper or composites with paper for example, composites with plastics with a basis weight of 20 - 500 g / m 2, preferably 40th
- the carrier substrate can also be provided with a release-capable transfer lacquer layer.
- An electromagnetic wave reflecting layer is applied to the carrier substrate.
- This layer can preferably be made of metals such as aluminum, gold, chromium, silver, copper, tin, platinum, nickel or tantalum, semiconductors such as silicon and their alloys such as nickel / chromium, copper / aluminum and the like or one Printing ink with metal pigments exist.
- the electromagnetic wave-reflecting layer is covered over the entire surface or partially by known processes, such as spraying, vapor deposition, sputtering, or, for example, as a printing ink by known printing processes (gravure, flexographic, screen, digital printing), by painting, roller application processes, slot nozzle (slot) Eye), dip (roll dip coating) or curtain coating (curtain coating) and the like applied.
- known processes such as spraying, vapor deposition, sputtering, or, for example, as a printing ink by known printing processes (gravure, flexographic, screen, digital printing), by painting, roller application processes, slot nozzle (slot) Eye), dip (roll dip coating) or curtain coating (curtain coating) and the like applied.
- a method using a soluble paint application for producing the partial metallization is particularly suitable for partial application.
- a paint application that is soluble in a solvent is applied to the carrier substrate, in a second step this layer optionally by means of an inline plasma, corona or
- a layer of the metal to be structured or the metal alloy is applied, whereupon in a fourth step the paint application is removed by means of a solvent, optionally combined with a mechanical action.
- the soluble paint is applied partially, the application of the metal or
- Metal alloy is made over the entire surface or partially.
- the partial layer reflecting electromagnetic waves can also be produced by a customary known etching process.
- the thickness of the layer reflecting electromagnetic waves is preferably approximately 10-50 nm, although higher or lower layer thicknesses are also possible.
- the carrier substrate itself can already form the layer reflecting electromagnetic waves.
- the reflection of this layer for electromagnetic waves is preferably 10-100%, in particular depending on the thickness of the layer or the metal foil used.
- the subsequent polymeric spacer layer or the polymeric spacer layers can also be applied over the entire surface or preferably partially.
- the polymeric layers consist, for example, of conventional or radiation-curing, in particular UV-curing, dyeing or coating systems based on nitrocellulose, epoxy, polyester, rosin, acrylate, alkyd, melamine, PVA, PVC, isocyanate. , Urethane or PS copolymer systems.
- This polymeric layer essentially serves as a transparent spacer layer, but depending on the composition it can be absorbent and / or fluorescent or phosphorescent in a certain spectral range. If necessary, this property can also be added by adding suitable chromophore. A suitable spectral range can be selected by selecting different chromophores. As a result, in addition to the tilting effect, the polymer layer can also be made machine-readable. For example, in the blue spectral range (in the range of approximately 400 nm), a yellow AZO dye, for example anilides, rodural, eosin, can be used. The dye also changes the spectrum of the marking in a characteristic manner.
- a yellow AZO dye for example anilides, rodural, eosin
- a marking with a color change when illuminated can even be generated if a suitable concentration is selected.
- the layer structure at the targeted observation angle has a spectrum with high absorption in the wavelength range of the emission of the fluorophore.
- Such a marking could also be combined well with the UV test lamps already used at checkouts.
- Another way to create a reversible color change is to use a switchable chromophore such as Bacteriorhodopsin To Use.
- a switchable chromophore such as Bacteriorhodopsin To Use.
- a suitable wavelength bacteria between 450 mm and 650 mm
- Bacteriorhodopsin undergoes a structural transformation, which changes back to its original state after the lighting is switched off and switches the color of the chromophore between purple and yellow.
- the integration of such chromophores in the layer structure, e.g. the spacer layer changes the absorption spectrum, the switching behavior also occurring.
- This polymeric layer can, depending on the quality of the adhesion on the carrier web or a layer which may be underneath Dewetting effects show what leads to a characteristic, macroscopic lateral structuring.
- This structuring can be induced or specifically changed, for example, by modifying the surface energy of the layers, for example by plasma treatment (in particular plasma functionalization), corona treatment, electron or ion beam treatment or by laser modification.
- plasma treatment in particular plasma functionalization
- corona treatment corona treatment
- electron or ion beam treatment or by laser modification.
- the polymeric spacer layer preferably has regions of different thickness. Through a defined variation in the thickness (gradient, defined steps, defined structures) of the polymeric spacer layer, a combination of different color shift effects is created in a finished security feature (multi-color shift effect).
- the thickness of the layer can be varied specifically in a wide range, for example in a range from 10 nm to 3 ⁇ m.
- the layer structure no longer produces a color that is recognizable to the human eye, but, depending on the mirror material, a slightly darker metallic impression compared to the pure mirror. This is due to the fact that the spectrum becomes more complex with increasing layer thickness (multipeak) and can no longer be resolved. For readers, however, the spectrum is still well measurable and even highly characteristic, the maximum spacer layer thickness to be measured depends on the resolution of the respective device. This is one way of creating an inconspicuous but machine-readable marking. Furthermore, when applying the polymeric spacer layer, a specific, defined layer thickness profile can be set, either in one application step or by applying several layers, which in turn can be full or partial depending on the desired layer thickness profile.
- the course of the layer thickness can also be designed in the form of a step structure, with different thicknesses of another polymer layer being partially applied to a base layer.
- At least one layer of the polymeric spacer layer can consist of a piezoelectric polymer, electrical properties here being able to be detected either by direct contact or by an electrical field.
- a characteristic interaction with electrical or electromagnetic fields can therefore be demonstrated by simple optical detection (e.g. with the naked eye, optical photometer and / or spectrometer).
- At least one layer of the polymeric spacer layer can have optically active structures, for example diffraction gratings, diffraction structures, holograms and the like, which can be embossed into the polymeric spacer layer, preferably before complete curing.
- optically active structures for example diffraction gratings, diffraction structures, holograms and the like, which can be embossed into the polymeric spacer layer, preferably before complete curing.
- a corresponding method is known for example from EP -A 1352732 A or from EP -A 1310381.
- the polymeric spacer layer is preferably applied by means of a printing process, for example by gravure printing.
- the fine structure in the spacer layer transferred by the printing cylinder or the printing plate then forms an additional forgery-proof feature.
- this fine structure forms a forensic and / or visible security feature that allows an unambiguous assignment to the manufacturing process (fingerprint).
- several different layer thicknesses of the polymeric spacer layer can be produced with a single cylinder. Different codes result from the different thicknesses. Another range of thicknesses of the polymeric spacer layer is then produced with another cylinder, it being possible for some codes to overlap.
- the same code can be produced with two different cylinders, which results in a further forensic and / or visible security feature and allows unambiguous assignment to the manufacturing process (fingerprint).
- the additional fingerprint is used either as a forensic feature (3rd level feature) or as an additional code substructure.
- Polymeric spacer layers which show cholesteric behavior are also preferably used.
- this also show polymers with two intrinsic chiral phases, e.g. Nitrocellulose.
- an additional characteristic security feature is generated by wavelength-selective polarization.
- the cholesteric behavior can lead to a characteristic change in the color spectrum, which can be detected by a reading device.
- a full-surface or partial layer, formed from metallic clusters, is then applied to the polymer layer.
- the metallic clusters can consist, for example, of aluminum, gold, palladium, platinum, chromium, silver, copper, nickel, tantalum, tin and the like or their alloys, such as Au / Pd, Cu / Ni or Cr / Ni.
- cluster materials are also applied, for example semiconducting elements of III. to VI.
- Main or second subgroup whose plasmon excitation can be triggered externally (for example via X-ray or ion radiation or electromagnetic interactions).
- the cluster layer can also have additional properties, for example electrically conductive, magnetic or fluorescent properties.
- additional properties for example, electrically conductive, magnetic or fluorescent properties.
- a cluster layer of Ni, Cr / Ni, Fe or core-shell structures with these materials or mixtures of these materials with the above-mentioned cluster materials has such additional features.
- Fluorescent clusters can also be produced using core-shell structures, for example, using Quantum Dots ® from Quantum Dot Corp.
- the cluster layer is applied over the entire area or partially, either exactly or partially congruently or offset to the full-area or partial layer reflecting electromagnetic waves.
- the adhesion of the metallic cluster layer to the polymeric spacer layer can preferably be set in a defined manner by guiding the application process of the cluster layer, so that if the adhesive strength differs, a proof of manipulation is created by destruction of the color effect.
- the varnish of the spacer layer can also be adjusted so that it shows good adhesion to the metal (cluster, mirror) but not to the base film. If this lacquer is printed over a partial Cu layer, when the element is detached, the mirror layer is separated in accordance with the structuring of the cluster layer. This creates a previously invisible evidence of manipulation.
- This cluster layer can be applied by sputtering (for example ion beam or magnetron) or evaporation (electron beam), or from a solution, for example by adsorption.
- the growth of the clusters and thus their shape and the optical properties can advantageously be influenced by adjusting the surface energy or the roughness of the layer underneath. This changes the spectra in a characteristic way. This can be done, for example, by thermal treatment in the coating process or by preheating the substrate.
- These parameters can also be changed in a targeted manner, for example by treating the surface with oxidizing liquids, for example with Na hypochlorite or in a PVD or CVD process.
- the cluster layer can preferably be applied by means of sputtering.
- the properties of the layer in particular the density and the structure, are adjusted above all by the power density, the amount of gas used and its composition, the temperature of the substrate and the web speed.
- an inert polymer for example PVA, polymethyl methacrylate, nitrocellulose, polyester or urethane systems
- PVA polymethyl methacrylate
- nitrocellulose nitrocellulose
- polyester or urethane systems small amounts of an inert polymer, for example PVA, polymethyl methacrylate, nitrocellulose, polyester or urethane systems
- the mixture can then subsequently be applied to the polymer layer by means of a printing process, for example screen, flexographic or preferably gravure printing, by means of a coating process, for example painting, spraying, roller application techniques and the like.
- the mass thickness of the cluster layer is preferably 2-20 nm, particularly preferably 3-10 nm.
- a so-called double cluster structure can be applied to the carrier substrate, a cluster layer being present on both sides of the spacer layer.
- a preferably black layer is applied under the first cluster layer.
- This black background can be applied either by means of a vacuum technology process, for example as unstoichiometric aluminum oxide or as printing ink by means of a suitable printing process, the printing ink being able to have additional functional features, for example magnetic, electrically conductive features and the like.
- a correspondingly colored film can also serve as a black or dark background.
- a black film By placing a black film on a double cluster setup, simple visual verification can be performed on site (simple test equipment).
- a double cluster feature can be introduced as a viewing window in a bank note or credit card or the like.
- the optical detection of the presence of the double cluster feature is carried out by placing a black film, for example made of polycarbonate.
- the clusters on both sides of the spacer layer can be applied to different thicknesses, each structured or full-area and / or consist of different materials in a structure.
- the metallic clusters are preferably deposited and directed at the steps or at certain points in the course of the layer thickness.
- This process can be intensified or reduced by suitable process management. For example, different optical effects are produced on microstructured surfaces than on smooth foils. This results in new (sub) codes.
- an optionally structured spacer layer then a partial cluster layer, then in turn an optionally structured spacer layer, in turn a preferably partial cluster layer, which for example is partially overlapping with the first cluster layer, can be applied to a full-surface reflection layer.
- Such sequences of spacer layer and cluster layer can expediently be repeated 2 to 3 times.
- such structures can be applied to a partially applied reflection layer, with different color shift effects being observed here, depending on the design of the partial reflection layer.
- the layer structure thus produced can then be structured using electromagnetic radiation (e.g. light).
- electromagnetic radiation e.g. light
- Lettering, letters, symbols, characters, images, logos, codes, serial numbers and the like can be used e.g. can be introduced by means of laser radiation or engraving.
- the layer structure is partially destroyed or the thickness of the polymeric spacer layer is changed.
- the polymeric spacer usually swells in these areas, causing a change in color (peak shift to longer wavelengths).
- the partial destruction means that the illuminated area either reflects metal (separation of the electromagnetic wave reflecting layer from the spacer layer) or that the material behind the mirror becomes visible. In this way, targeted structuring with colored, reflecting or colorless areas can be achieved.
- the lighting output can also be selected so that only the color effect is changed, whereby partial areas with defined different colors are created (multi-color tilt effect). The energy that is actually absorbed by the layer structure is essential for the change.
- a cluster layer directly to a carrier substrate which is at least partially transparent in the visible spectral range; a spacer layer and a further cluster layer are then applied to this cluster layer, as described, a black layer then optionally being applied to this cluster layer , as already described, can be applied.
- a so-called inverse layer structure is thus obtained.
- An inverse setup with a single cluster layer (application of the cluster layer to the carrier substrate, subsequent application of the polymeric spacer layer and the electromagnetic wave reflecting layer) can also be produced in an analogous manner, the properties of the individual layers corresponding to the preceding description.
- the carrier substrate can also already have one or more functional and / or decorative layers.
- the functional layers can, for example, have certain electrical, magnetic, special chemical, physical and also optical properties.
- conductivity for example conductivity, graphite, carbon black, conductive organic or inorganic polymers
- Metal pigments for example copper, aluminum, silver, gold, iron, chromium lead and the like
- metal alloys such as copper-zinc or Copper-aluminum or its sulfides or oxides, or amorphous or crystalline ceramic pigments such as ITO and the like
- doped or undoped semiconductors such as silicon, germanium or ion conductors such as amorphous or crystalline metal oxides or metal sulfides can also be used as additives.
- polar or partially polar compounds such as surfactants or non-polar compounds such as silicone additives or hygroscopic or non-hygroscopic salts can be used or added to adjust the electrical properties of the layer.
- Paramagnetic, diamagnetic and also ferromagnetic substances such as iron, nickel and cobalt or their compounds or salts (for example oxides or sulfides) can be used to adjust the magnetic properties.
- the optical properties of the layer can be determined by visible dyes or pigments, luminescent dyes or pigments that fluoresce or phosphoresce in the visible, in the UV range or in the IR range, effect pigments such as liquid crystals, pearlescent, bronzes and / or heat-sensitive Affect colors or pigments. These can be used in all possible combinations.
- phosphorescent pigments can also be used alone or in combination with other dyes and / or pigments.
- soluble and non-soluble dyes or pigments can be used especially for coloring magnetic pigments.
- a brown magnetic paint can be made metallic, for example silvery, by adding metals.
- Insulator layers can also be applied, for example.
- insulators are organic substances and their derivatives and compounds, for example dyeing and lacquer systems, for example epoxy, polyester, rosin, acrylate, alkyd, melamine, PVA, PVC, isocyanate, urethane systems, which are radiation-curing can be suitable, for example by heat or UV radiation.
- forensic features can be introduced into one of the layers, which allow testing in the laboratory or with suitable test equipment on site (possibly with the feature being destroyed), e.g. DNA in NC lacquer, antigens in acrylate lacquer systems.
- DNA can be adsorbed or bound to the clusters.
- Isotopes can also be added to the clusters or in the mirror material or be present in the spacer layer (e.g. Elemental Tag from KeyMaster Technologies Inc.).
- a deuterated polymer e.g. PS-d
- PS-d can be used as a spacer layer or a low-level radioactive mirror material as a mirror.
- These layers can be applied by known methods, for example by vapor deposition, sputtering, printing (for example gravure, flexographic, screen, digital printing and the like), spraying, electroplating, roller application methods and the like.
- the thickness of the functional layer is 0.001 to 50 ⁇ m, preferably 0.1 to 20 ⁇ m.
- the coated film produced in this way can also be protected by a protective lacquer layer or further refined, for example, by lamination or the like.
- the product can be applied to the corresponding carrier material using a sealable adhesive, for example a hot or cold seal adhesive, or a self-adhesive coating be, or embedded in the paper for example in the paper production for security papers by conventional methods.
- a sealable adhesive for example a hot or cold seal adhesive, or a self-adhesive coating be, or embedded in the paper for example in the paper production for security papers by conventional methods.
- 1 means the optically transparent carrier substrate, 2 the first layer reflecting electromagnetic waves, 3 the polymeric spacer layer, 4 the layer made of metallic clusters, 5 an adhesive or laminating layer, 6 a protective layer 7, a transfer lacquer layer, 8 one black layer, 10 the beam path of the incident and reflected light.
- Fig. 1 is a schematic cross-sectional view of a first permanently visible marking on a film with a double cluster setup.
- Fig. 2 is a schematic cross-sectional view of a first permanently visible marking on a film with double cluster setup and beam path of the optical detection means, for example spectrometer, color measuring device, or the like.
- Fig. 3 shows a direct double cluster setup with a black background
- Fig. 4 shows an indirect double cluster setup with a black background
- Fig. 5 shows a setup with partial reflection layer
- coated carrier materials produced according to the invention can be used as security features in banknotes, data carriers, value documents, labels, labels, seals, in packaging, textiles and the like.
- a Cr cluster layer with a thickness of 3 nm is applied to a polyester film with a thickness of 23 ⁇ m in a sputtering process.
- a urethane varnish as a polymeric spacer layer with a thickness of 0.5 ⁇ m is printed using gravure printing using a specially optimized printing cylinder. This is followed again by the deposition of a 3 nm thick Cr cluster layer. Finally, a black-colored film is laminated onto this cluster layer. A color shift effect from violet to gold is observed.
- the polymer layer is structured like a chessboard in a double cluster setup, the edge length of the chessboard fields being less than 0.1 mm.
- the blackening of the background foil is structured with analog checkerboard fields. If the structured foils are precisely overlaid, both the expression of the moiré pattern and the tipping color can be observed. In this way, maximum security can be guaranteed by simple on-site testing.
- Clusters which were produced by chemical synthesis in solution and are present as a dispersion in solution.
- cluster-containing solutions are printed in very thin layers or adsorbed from the solution. If clusters are used that have additional properties, additional security can be generated.
- Silver nanopowder from Argonide can be used as powdered cluster materials for printing.
- Magnetic pigments from Sustech can be used as magnetic cluster materials. Most suitable are ferrofluids or pigments in powder form of the type: FMA (super paramagnetic ferrite) with a hydrophilic coating. FMA mean primary particle size: 10 nm diameter.
- SSPH Sequential Solution Phase Hydrolysis particles from Nanodynamics or Nanopowders can be used as corshell clusters. For example, Au on SnO 2 or Au on SiO 2 particles with an inner diameter of 20 nm and an outer diameter of 40 nm can be used.
- the particles from Quantum Dot Corporation can be used as fluorescent particles: as core material CdS and as shell material ZnS. Core diameter: 5nm; Shell diameter: 2.5 nm.
- a printing cylinder with different cell volumes is produced in different areas over its width.
- This cylinder is used to print the spacer layer on a film covered with a uniform cluster layer.
- sharply delimited areas with defined different thicknesses of the spacing layer are obtained over the web width.
- a uniform aluminum mirror layer is then evaporated.
- the tapes with different color codes are then separated in a roll cutting process. For example, security elements with several different codes are produced in one production run.
- a security strip is cut out of a sheet of film produced as described in Example 4 in such a way that a sharp code transition comes to lie exactly in the middle of the strip.
- the strip produced in this way then contains, as an additional security level, two machine-readable codes which are detected individually or together with the reading device.
- All of the layer structures described can be structured in a targeted manner using suitable lasers.
- an inverse layer structure was partially destroyed at the lasered areas using a 1064 nm Powerline laser from Rofin Sinar. The power was set so that the laser detaches the polymeric spacer layer from the aluminum mirror layer, so that the lasered areas no longer appear colored, but show the metallic gloss of the mirror layer. The lasering was carried out selectively. The image shown is thus composed of a dot matrix made of metallic reflecting areas in the colored area. In this way, individualized, forgery-proof markings can be made very quickly ( ⁇ 1sec) e.g. for ID cards.
- marker substances can be used which are only accessible for forensic detection.
- a label of 1 per mille solid DNA can be added to the volume of the lacquer in a nitrocellulose lacquer. Under normal conditions (25 ° C, 80% humidity), the DNA adsorbs firmly onto the nitrocellulose and is so firmly anchored in the paint matrix.
- the DNA can be extracted in the laboratory and detected using molecular biological methods. If suitable DNA sequences are used, these can also be detected on site, for example by means of a suitable hybridization assay.
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AT0023604A AT504587A1 (en) | 2004-02-16 | 2004-02-16 | IMPACT-SAFE SAFETY FEATURE WITH COLOR TIP EFFECT |
PCT/EP2005/001385 WO2005077668A1 (en) | 2004-02-16 | 2005-02-11 | Tamper-proof, color-shift security feature |
Publications (2)
Publication Number | Publication Date |
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EP1716007A1 true EP1716007A1 (en) | 2006-11-02 |
EP1716007B1 EP1716007B1 (en) | 2008-07-09 |
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EP05715300A Not-in-force EP1716007B1 (en) | 2004-02-16 | 2005-02-11 | Tamper-proof, color-shift security feature |
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US (2) | US20070110965A1 (en) |
EP (1) | EP1716007B1 (en) |
AT (2) | AT504587A1 (en) |
CA (1) | CA2555821C (en) |
DE (1) | DE502005004629D1 (en) |
ES (1) | ES2308450T3 (en) |
RU (1) | RU2377134C2 (en) |
UA (1) | UA91012C2 (en) |
WO (1) | WO2005077668A1 (en) |
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WO2012025216A1 (en) | 2010-08-27 | 2012-03-01 | Hueck Folien Ges.M.B.H. | Value document having an at least partially embedded security element |
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-
2004
- 2004-02-16 AT AT0023604A patent/AT504587A1/en not_active Application Discontinuation
-
2005
- 2005-02-11 WO PCT/EP2005/001385 patent/WO2005077668A1/en active IP Right Grant
- 2005-02-11 RU RU2006133334/12A patent/RU2377134C2/en not_active IP Right Cessation
- 2005-02-11 CA CA2555821A patent/CA2555821C/en not_active Expired - Fee Related
- 2005-02-11 EP EP05715300A patent/EP1716007B1/en not_active Not-in-force
- 2005-02-11 DE DE502005004629T patent/DE502005004629D1/en active Active
- 2005-02-11 AT AT05715300T patent/ATE400449T1/en active
- 2005-02-11 UA UAA200609649A patent/UA91012C2/en unknown
- 2005-02-11 US US10/587,074 patent/US20070110965A1/en not_active Abandoned
- 2005-02-11 ES ES05715300T patent/ES2308450T3/en active Active
-
2011
- 2011-08-02 US US13/195,985 patent/US8678442B2/en not_active Expired - Fee Related
Non-Patent Citations (1)
Title |
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See references of WO2005077668A1 * |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2012025216A1 (en) | 2010-08-27 | 2012-03-01 | Hueck Folien Ges.M.B.H. | Value document having an at least partially embedded security element |
Also Published As
Publication number | Publication date |
---|---|
ATE400449T1 (en) | 2008-07-15 |
CA2555821C (en) | 2012-11-27 |
US8678442B2 (en) | 2014-03-25 |
DE502005004629D1 (en) | 2008-08-21 |
CA2555821A1 (en) | 2005-08-25 |
US20070110965A1 (en) | 2007-05-17 |
EP1716007B1 (en) | 2008-07-09 |
RU2006133334A (en) | 2008-04-10 |
UA91012C2 (en) | 2010-06-25 |
US20110291401A1 (en) | 2011-12-01 |
AT504587A1 (en) | 2008-06-15 |
WO2005077668A1 (en) | 2005-08-25 |
ES2308450T3 (en) | 2008-12-01 |
RU2377134C2 (en) | 2009-12-27 |
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