EP2996885B2 - Verfahren zur herstellung von sicherheitsdokumenten - Google Patents

Verfahren zur herstellung von sicherheitsdokumenten Download PDF

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Publication number
EP2996885B2
EP2996885B2 EP14725517.8A EP14725517A EP2996885B2 EP 2996885 B2 EP2996885 B2 EP 2996885B2 EP 14725517 A EP14725517 A EP 14725517A EP 2996885 B2 EP2996885 B2 EP 2996885B2
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EP
European Patent Office
Prior art keywords
substrate
region
reflection enhancing
enhancing material
curable
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.)
Not-in-force
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EP14725517.8A
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English (en)
French (fr)
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EP2996885B1 (de
EP2996885A1 (de
Inventor
Brian Holmes
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De la Rue International Ltd
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De la Rue International Ltd
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    • 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
    • B42D25/30—Identification or security features, e.g. for preventing forgery
    • B42D25/328—Diffraction gratings; Holograms
    • 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
    • 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
    • B42D2033/04—
    • B42D2033/10—
    • B42D2033/18—
    • B42D2033/30—
    • B42D2035/20—
    • B42D2035/36—

Definitions

  • the present invention relates to security documents such as banknotes, currency, identification documents, passports, cheques, visas, certificates and the like, and methods for their manufacture.
  • the invention relates to security documents incorporating security devices in the form of optically variable effect generating relief structures such as holograms and/or diffraction gratings.
  • the disclosed methods are particularly well adapted for integral formation of such security devices on a security document having a polymeric substrate, such as a polymer banknote.
  • Optically variable effect generating relief structures such as holograms and diffraction gratings have been used widely over the last few years to impart security to documents of value such as banknotes, credit cards, passports and the like.
  • the structure is provided on a transfer foil and then hot stamped from the transfer foil onto the final document substrate.
  • An early example of this approach is described in US-A-4728377 .
  • Such techniques work well with traditional security documents having substrates formed of paper, for example.
  • substrates such as polymer substrates.
  • polymer-based banknotes typically comprise a substrate of polypropylene, which can withstand temperatures up to around 80 degrees C.
  • Hot stamping methods commonly operate at higher temperatures, e.g. around 250 to 300 degrees C, which would cause damage to such substrates. Meanwhile, the use of cold adhesives has generally proved unsuccessful since the bond between polymer and security device is often not sufficiently robust.
  • a curable material is applied to the polymer substrate and embossed with a desired relief structure. Simultaneously or subsequently, the material is cured, e.g. by exposure to UV radiation, in order to fix the relief structure. A metallic ink is then applied to the relief to provide a reflective layer, in order to render the optically variable effect visible.
  • An example of such a method is disclosed in WO-A-2008/031170 .
  • a method of manufacturing a security document comprises:
  • viewing region it is meant a gap in the coating layer(s) applied in step (d), within which the relief structure will be viewed in the end product.
  • the viewing region could have the same opacity as its surroundings such that it is not distinguishable in transmitted light.
  • the viewing region comprises a window region, i.e. a region of lower opacity than its surroundings.
  • the coating layer(s), curable material and reflection enhancing material can all be applied in register with one another, whilst still enabling the use of a metal or HRI layer as the reflection enhancing material.
  • the optical quality of the security device formed in the third region by the cured material and reflection enhancing material in combination can be comparable to those of traditional foil-based devices.
  • steps (b), (d) and (e) the respective curable material, coating layers and masking substance are applied in register with one another and advantageously in register with the relief structure formed in step (c).
  • each of the steps defining the end locations of the viewing region in the coating layer(s), the curable material and the reflection enhancing material can be performed using similar or the same type of application techniques (e.g. printing or coating), and hence all can be performed in a continuous, in-line process.
  • This further enhances the achievable registration and simplifies the manufacturing process since all of these application steps can be completed before the deposition step (e.g. metallisation), which may take place separately, e.g. as part of a separate process and potentially on separate apparatus. This may be the final step in the manufacturing process with no need for further application steps, hence reducing the manufacturing process to two key stages.
  • the viewing region could take a number of different forms, including an interruption in only the coating layer(s) applied to the first or second side of the substrate to reveal the security device, whilst the other side may ultimately be fully coated with opaque material, in which case the viewing region will not be visible in transmission.
  • the viewing region defined by the coating layer(s) laid down in step (d) is a window region. This may ultimately be a full window (i.e. no coating layer is provided on either side of the substrate in the window region) or a half window (i.e. coating layer(s) of less than 100% opacity are applied to only one side of the substrate in the window region).
  • the coating layer(s) which are laid down in step (d) are the layer(s) which define the location, shape and size of the viewing region by means of a gap in those layer(s). In some cases, this will include all of the coating layers which are planned to be applied to the security document. However, in other cases there may be additional coating layer(s) which do not contribute to the definition of the viewing region and in this case such additional layer(s) could be applied during step (d) or at any later stage, including after step (e) or after step (f).
  • the coating layer(s) applied to one side of the substrate may extend all over the substrate and these could be applied later since no registration between such all-over layer(s) and any other feature is necessary.
  • the coating layer(s) applied in step (d) will generally be applied outside the first region containing the curable material, those coating layer(s) may also overlap that first region, provided that on the first surface, at least part of the first region is left uncovered at the end of step (d) so that it is available for receipt of reflection enhancing material in step (f).
  • the coating layer(s) applied in step (d) will not fully overlap the curable material, but on the second surface of the substrate the coating layer(s) applied in step (d) may extend across the whole first region, e.g. if the viewing region is to be a half-window.
  • the coating layer(s) define either a window or a "half-window" structure (translucent or non-translucent) on the substrate within which at least part of the curable material is located.
  • the relief structure could be configured to exhibit any type of optically variable effect, which means that its appearance is different at different viewing angles.
  • the optically variable effect generating relief structure is one which gives rise to a diffractive optical effect, such as a hologram or a diffraction grating.
  • the relief structure may be a non-holographic optical structure, such as a prismatic structure.
  • the masking substance could operate according to various different mechanisms, including inhibiting adhesion of the reflection enhancing material to the substrate and/or obstructing deposition of the reflection enhancing material onto the substrate in the first place.
  • the masking substance may repel the reflection enhancing material such that no deposition of the reflection enhancing material occurs in the areas to which the masking substance has been applied. In other cases, there may be some deposition of the reflection enhancing material in these areas. This may become detached subsequently without any positive intervention, but in preferred implementations, the method further comprises, after step (f):
  • the masking substance comprises an oil mask adapted such that application of the reflection enhancing material thereto causes degassing of the oil mask, thereby impeding adhesion of the reflection enhancing material to the substrate.
  • oil masks include low molecular weight oils, including silicones, which will boil off in a vacuum environment.
  • US-A-3935334 mentions oil masks in the content of metallised resin films for condenser elements.
  • the masking substance comprises a soluble mask, such as soluble ink (comprised of an appropriate binder and pigment combination), which does not adhere strongly to the substrate or can be dissolved by application of a solvent (aqueous or otherwise), thereby impeding adhesion of the reflection enhancing material applied thereto to the substrate. In this case a washing step may be required.
  • a suitable soluble mask in the form of a heavily pigmented ink are described in WO-A-9913157 .
  • the soluble mask is configured such that, when coated with a thin deposited layer of reflection enhancing material (e.g.
  • the masking substance creates small holes or discontinuities in the metal film by virtue of the fact that the metal film (typically 15 to 30nm thick) is not thick enough to continuously over coat the pigment grains in the mask.
  • a suitable solvent preferably water
  • the solvent enters through these holes, dissolving the pigment such that the overlying metal layer disbands.
  • the pigment grain dimensions are preferably greater than the thickness of the reflection enhancing film. For instance, preferred pigment grain sizes may be in the range of greater than or equal to about 100 nm, and less than 500 nm.
  • a soluble mask will be preferred over an oil mask in many cases, since such oils (e.g. low molecular weight oils) will tend to offset, transfer or smear if the substrate web is wound into a roll after printing.
  • oils e.g. low molecular weight oils
  • the use of oil masks is more suited to processes in which in-line metalisation takes place after the printing or other application steps (i.e. there is no rewind process between printing and metalisation).
  • the use of a print soluble mask applied does not impose such limitations.
  • the vapours produced by degassing of an oil mask can in some circumstances lead to contamination of the optical structure.
  • the curable material, coating layer(s) and masking substance can be laid down using any appropriate method which enables selective application of the materials to the desired regions of the substrate.
  • the respective curable material, coating layers and/or masking substance are applied using one or more printing technique(s), such as gravure printing, flexographic printing or slotted die coating.
  • Printing techniques are preferred since the materials can be laid down in a precisely controllable manner. Different printing techniques may be used for each of the steps as appropriate for the material in question. However, in particularly preferred embodiments, the same printing technique is used for steps (b), (d) and (e), which simplifies the manufacturing process and apparatus.
  • steps (b), (c), (d) and (e) are performed in a continuous, in-line process.
  • these steps may be carried out at stations along one continuous manufacturing line such that the relative location of the substrate is known between one station and the next. This approach allows particularly high registration to be achieved and also delimits all the printing/application steps from subsequent metallisation (or other deposition) processes.
  • the deposition of the reflection enhancing material can be achieved using any appropriate deposition technique but generally a non-selective deposition technique will be preferred for simplicity. That is, the technique will result in the deposition of a contiguous layer of the reflection enhancing material across the entire area of the substrate which is exposed to the deposition process. In many cases, this will be the entire first surface of the substrate (although this is not essential).
  • the reflection enhancing material is deposited by vacuum deposition, suitable techniques including electron beam vapour deposition, vapour deposition from a resistively heated source (e.g. a boat source), pulsed laser vapour deposition, evaporative vapour deposition and sputtering, as well as chemical vapour deposition methods. Evaporative vapour deposition techniques from resistively heated or electron beam sources are generally preferred.
  • the reflection enhancing material is a metal or alloy, or a material with a refractive index which differs from that of the cured material by at least 0.3, more preferably 0.5 (known as "high refractive index (HRI)" materials). That is, the reflection enhancing material is laid down as a contiguous layer of the selected material (or as multiple spaced portions each having such a contiguous layer). This should be contrasted with materials such as metallic inks, which comprise a dispersion of reflective particles in a binder, the reflective (particle) material itself therefore not forming a contiguous layer. Examples of suitable metals or alloys include aluminium, copper, nickel, chrome, aluminium-copper allows, silver, gold, etc.
  • high refractive index materials we mean materials having an index of refraction which exceeds that of the transparent base layer by a numerical value of preferably 0.5 or more. Since the refractive index of the base layer will typically fall in the range of 1.45 - 1.55, then a high refractive index material will be one with an index of preferably 2.0 or more. In practice high refractive index materials with good visual transparency will have an index in the range 2.0 to 2.5.
  • suitable HRI materials include zirconium dioxide and zinc sulphide and titanium dioxide
  • the curable material is a transparent curable material. This enables the optical effect generated by the relief structure to be observed through the substrate and hence, if the opposite side of the relief structure is also visible and both sides of the reflection enhancing material conform to the relief, the optical effect is exhibited by both sides of the device. This results in a security device with a strong visual impact and hence increased security level.
  • the curable transparent material may be of a type which can be cured by the application of any form of energy, such as heat.
  • the curable transparent material is radiation-curable, preferably UV-curable, and in step (c) the curing comprises exposing the formed curable material to curing radiation, preferably UV radiation.
  • the application of radiation can generally be more accurately controlled than that of heat, e.g. through the use of appropriately directed radiation sources and/or masks.
  • the cross-linking action is generally much more rapid in UV curable systems compared to thermal cure systems leading to a more accurate relief forming process.
  • the substrate is at least semi-transparent to the curing energy (e.g. to the relevant radiation wavelength(s)), so that the energy can be applied to the curable material through the substrate.
  • Polypropylene for example, is generally transparent to UV wavelengths.
  • the curable material is preferably at least visually semi-transparent (i.e. transmits wavelengths in the visible range) such that the optical effect of the device can be viewed through the material.
  • the material need not transmit all visible wavelengths equally and in preferred examples, the material further comprises an optically effective substance, preferably a visible colourant, a luminescent, phosphorescent or fluorescent material. This further enhances the security level of the device and can be used to cause the optically variable effect to be seen in a different colour when viewed from one side of the device (through the curable material) as opposed to the other.
  • Such optically effective substances could additionally or alternatively be disposed in any of the other layers of the device, including the substrate and/or the reflection enhancing layer.
  • step (b) comprises applying two or more curable materials to the first region of the substrate in a pattern, one or more of the curable materials comprising an optically effective substance such that the two or more curable materials have different optical characteristics, preferably visibly different under at least visible or non-visible illumination.
  • the security level of the device is further increased. If two or more curable materials are provided it is preferred that they are each adapted to be cured by the same type of curing energy and most advantageously at the same rate as one another, so that both are cured simultaneously in step (c).
  • the partially cured transparent material and the layer of reflection enhancing material can be formed by any appropriate method but preferably the layers are embossed with a die carrying the relief structure, wherein the die advantageously forms part of an embossing roller.
  • the embossing roller may preferably carry the relief structure in the form of a repeating pattern. The repeat periodicity is preferably matched to that of the document repeat length and/or width.
  • the curable material may be cured simultaneously with and/or subsequently to forming of the relief structure in the surface of the curable material.
  • the embossing roller is opaque (e.g. metal)
  • curing can occur at the point of impression with radiation being transmitted through the substrate, for instance using a transparent quartz nip roller opposing the embossing roller.
  • curing can take place just after the resin leaves the impressing nip, in which case the radiation can be applied through the substrate or from the opposite side.
  • the one or more coating layers applied in step (d) comprises one or more opacifying layers.
  • This step is particularly relevant where the substrate is to become the substrate of a polymer banknote.
  • the coating may be applied to one or both sides of the substrate and as mentioned above, is preferably omitted across the (third) region in which the security device is formed on both sides, although in some cases it may be applied across all of some of the region on the side of the substrate opposite from that to which the curable material is applied. This can lead to the appearance of a "half window” effect and/or conceal one or more portions of the device when viewed through the substrate.
  • Opacifying layers typically comprise a binder containing a white (or other coloured) pigment.
  • the method further comprises, after step (d) or step (f), printing a graphics layer onto the one or more coating layers.
  • the graphics layer may include for example background patterns such as those typically seen on banknotes, optionally incorporating fine line patterns, guilloches and other security features, information such as denomination and other standard document data, and/or printed features which uniquely identify or personalise the document, such as a serial number in the case of a banknote or details of the holder in the case of an identity document.
  • background patterns such as those typically seen on banknotes, optionally incorporating fine line patterns, guilloches and other security features, information such as denomination and other standard document data, and/or printed features which uniquely identify or personalise the document, such as a serial number in the case of a banknote or details of the holder in the case of an identity document.
  • guilloches and other security features such as those typically seen on banknotes
  • information such as denomination and other standard document data
  • printed features which uniquely identify or personalise the document, such as a
  • the method further comprises, prior to step (b) or step (d), treating the surface of the substrate to increase adhesion between the substrate and the curable material and/or the coating layer(s), preferably by the application of a primer substance or corona treatment.
  • a primer substance or corona treatment can for example raise the surface of the substrate making it more receptive to the subsequent application of the curable material and/or the coating layer(s).
  • the method further comprises, after step (c), treating the formed surface of the cured material to increase adhesion between the cured material and the reflection enhancing material, preferably by plasma or corona treatment.
  • the method can preferably be implemented as a web-based process with multiple security devices (i.e. "third regions") being formed on a substrate which is then divided such that each device is located on a separate piece of substrate.
  • the method further comprises, after step (f), cutting the substrate into individual security. Typically this would also take place after the optional step of printing a graphics layer has been performed.
  • the first, second and/or third regions define respective indicia such as a character, letter, number, symbol, graphic element or the like, the respective indicia preferably being different.
  • first and second regions, and hence the third region are the same such that the reflection enhancing material is retained across the whole of the region in which the curable material is present.
  • the third region is contained within the first region, such that the reflection enhancing material is retained across less than the whole of the region in which the curable material is present.
  • the shape of the viewing region (preferably a window region) may also or alternatively define such indicia.
  • the substrate is transparent and preferably comprises a polymer such as polypropylene (PP), orientated polypropylene (OPP), biaxially orientated polypropylene (BOPP) polyethylene teraphthalate (PET), polyethylene, polyamide, polycarbonate, or polyethylene naphthalate (PEN).
  • PP polypropylene
  • OPP orientated polypropylene
  • BOPP biaxially orientated polypropylene
  • PET polyethylene teraphthalate
  • PET polyethylene
  • polyamide polyamide
  • polycarbonate polyethylene naphthalate
  • the security document is a banknote, a polymer banknote, a hybrid paper/polymer banknote, an identity document, a passport, an identification card, a cheque, a visa, a certificate, or a stamp.
  • the invention further provides a security document manufactured in accordance with the above method, wherein the security document is preferably a banknote, a polymer banknote, a hybrid paper/polymer banknote, an identity document, a passport, an identification card, a cheque, a visa, a certificate, or a stamp.
  • the security document is preferably a banknote, a polymer banknote, a hybrid paper/polymer banknote, an identity document, a passport, an identification card, a cheque, a visa, a certificate, or a stamp.
  • the security document is manufactured in accordance with the method described above, and can have any of the features resulting from any of the method steps described above.
  • the security document is preferably a banknote, a polymer banknote, a hybrid paper/polymer banknote, an identity document, a passport, an identification card, a cheque, a visa, a certificate, or a stamp.
  • Also disclosed and not claimed is a plurality of such security documents, wherein the cured material, reflection enhancing material and viewing region in the one or more coating layers have substantially the same positions relative to one another in each of the plurality of security documents.
  • the present description will focus on security documents provided with integral security devices having optically variable effect generating relief structures which give rise to diffractive optical effects, such as holograms or diffraction gratings.
  • the relief structure may be a non-holographic micro-optical structure, such as a prismatic structure.
  • prismatic structures suitable for the security devices of the sort presently disclosed include, but are not limited to, a series of parallel linear prisms with planar facets arranged to form a grooved surface, a ruled array of tetrahedral, an array of square pyramids, an array of corner cube structures, and an array of hexagonal faced corner cubes.
  • micro-optical structure is one which functions as a micro lens, including those that refract light at a suitably curved surface of a homogeneous material such as plano-convex lenslets, double-convex lenslets, plano-concave lenslets and double-concave lenslets.
  • suitable micro-optical structures include geometric shapes based on domes, hemispheres, hexagons, squares, cones, stepped-structures, cubes or combinations thereof.
  • Figure 1 depicts a first embodiment of a security document 1, such as a banknote, cheque, visa, passport, identification card etc., which is provided with a security device 10.
  • the security document 1 is formed based on a transparent substrate 2, such as a polymer film, which also forms a substrate of the security device 10.
  • the security device 10 is considered to be integrally formed with the security document 1.
  • the substrate 2 is typically formed of a visually transparent polymer such as polypropylene, although other flexible polymeric films suitable include polyethylene terephthalate PET), polyethylene, polyamide, polycarbonate, polyvinylchloride (PVC), polyvinylidenechloride (PVdC), polymethyl methacrylate (PMMA), or polyethylene naphthalate (PEN).
  • the substrate 2 carries one or more coating layers on one or both of its surfaces which increases the document's opacity in the covered regions and/or provides a background to printed graphics.
  • the substrate 2 is coated with opacifying layers 3 and 4, which layers carry printed graphics 5a and 5b.
  • both layers 3 and 4 are provided on both sides of the security document 1, but in other cases the layers may be provided on only one side or the other. Further, here the coatings 3 and 4 are omitted on both sides of the documents to define a viewing region 20 within which the security device 10 is located.
  • the viewing region 20 is a window region having a lower opacity than its surroundings, and will therefore be referred to hereinafter as a "window", although this is not essential as described below.
  • the structure depicted in Figure 1 is a "full-window”.
  • the layers 3, 4 (and 5) may be omitted in the window region 20 only on one side of the document, with one or more of the layers 3, 4 and 5 continuing over all or part of the window 20 on the other side of the document. This can be used either to create a so-called "half window” effect or to prevent viewing of the device through the document, as discussed further below.
  • a curable transparent material 11 such as a radiation curable resin or a thermoplastic material containing a curable cross-linking agent is disposed on the substrate 2 across a first region R 1 .
  • the curable transparent material 11 carries a reflection enhancing material 12, such as a metal film (e.g. aluminium or copper) or a HRI layer (e.g. zinc sulphide).
  • the curable transparent material 11 has been formed so as to follow the contours of a surface relief 13 defining an optically variable effect generating structure, such as a hologram or diffraction grating (as discussed further above), and the reflection enhancing material 12 follows the contours of the relief.
  • the reflection enhancing material 12 is present across a second region R 2 , which at least overlaps with the first region R 1 and in this case is the same as region R 1 .
  • the parts of the first and second region which overlap define the third region R 3 , in which the reflection enhancing material is deposited on the formed curable material to form security device 10.
  • the curable material 11, reflection enhancing material 1 and window 20 defined by coating layers 3, 4 are substantially in register with one another, such that their relative locations do not vary substantially between one banknote and another of the same type.
  • the position tolerance of the curable material 11, reflection enhancing material 1 and coating layers 3, 4 may be as low as +/- 100 to 200 microns or exceptionally less from one document to the next.
  • the security document is completed by the application of a protective varnish or lacquer 19 (also preferably transparent) which covers the security device and, here, also a portion of the surrounding window region 20 and optionally coatings 3, 4 and 5.
  • a protective varnish or lacquer 19 also preferably transparent
  • the whole first surface 2a of the security document 1 may be covered with the protective coating 19.
  • the coating 19 could be coloured or multicoloured or contain a security substance, e.g. a fluorescent, luminescent or phosphorescent material.
  • the transparent curable material 11 is not applied directly to the transparent substrate 2, but rather a primer layer 9 exists between the substrate 2 and the curable transparent material 11.
  • the primer layer 9 improves adhesion between the substrate 2 and the transparent curable material 11.
  • the substrate 2 may be corona treated in order to improve adhesion between it and curable material 11.
  • Figure 2 shows a plan view of the security document of Figure 1 as viewed by observer A.
  • the document 1 carries graphic layer 5 across much of its surface which (together with underlying coating layers 3 and 4) is omitted in the region of window 20.
  • the security device 10 extends across the region R 3 which here has the form of a sun-shaped symbol.
  • the region R 3 may define an alternative indicia such as a letter, number or graphic, and the region R 3 could extend to cover the whole window 20 (although this is less preferred).
  • the optically variable effect generated by relief structure 13 is visible across the whole of sun-shaped region R 3 (assuming the relief structure 13 itself extends across the whole of the region). Outside the region R 3 , the window 20 is transparent and optically invariable.
  • Figure 3 depicts steps in a first embodiment of a method suitable for forming a security device of the sort described with respect to Figures 1 and 2 .
  • Figures 4(a) to (f) show another embodiment of a security document at various stages during its manufacture.
  • a curable material 11 is applied to the first surface 2a of substrate 2, e.g. using any appropriate coating or printing techniques, preferably gravure, and the resulting structure is shown in Figure 4a .
  • the substrate may be treated prior to application to curable material 11, either by applying a primer layer 9 or by corona treatment to raise the surface of the substrate material, for example.
  • the curable material is applied across a first region R 1 which may define indicia.
  • the curable material could be a radiation curable resin or a thermoplastic containing a curable hardening agent.
  • a curable resin may typically be one of two types: a) Free radical cure resins which are unsaturated resins or monomers, prepolymers, oligomers etc. containing vinyl or acrylate unsaturation for example and which cross-link through use of a photo initiator activated by the radiation source employed e.g. UV; or b) Cationic cure resins in which ring opening (e.g. epoxy types) is effected using photo initiators or catalysts which generate ionic entities under the radiation source employed, e.g. UV. The ring opening is followed by intermolecular cross-linking.
  • Free radical cure resins which are unsaturated resins or monomers, prepolymers, oligomers etc. containing vinyl or acrylate unsaturation for example and which cross-link through use of a photo initiator activated by the radiation source employed e.g. UV
  • Cationic cure resins in which ring opening (e.g. epoxy types) is effected using photo initiators or catalysts which generate i
  • the radiation used to effect curing will typically be UV radiation but could comprise electron beam, visible, or even infra-red or higher wavelength radiation, depending upon the material, its absorbance and the process used.
  • Alternative thermoplastic lacquers such as PMMA-based resins, acrylic resins or vinyl/styrene copolymers could be used with added curing agent.
  • a relief structure 13 is formed into the surface of the curable material 11 so as to define an optically variable effect generating structure such as a hologram or a diffraction grating. This may be achieved for example by impressing the curable material using an embossing roller.
  • the material is cured, for example by exposure to an appropriate curing energy such as heat or radiation (preferably UV radiation) in order to fix the relief structure in place such that the material cannot relax or exhibit viscous flow.
  • an appropriate curing energy such as heat or radiation (preferably UV radiation)
  • Any known cast-cure process can be used to perform step S103 and it should be noted that curing may take place simultaneously with and/or subsequently to the casting of the relief into the material.
  • Figure 4b shows the formed relief 13 in material 11 and irradiation of the material with curing energy E (e.g. UV radiation) through substrate 2.
  • curing energy E e.g. UV radiation
  • one or more coating layers are applied to the substrate defining a viewing region (e.g. a window region) containing all or part of the region in which curable material 11 has been laid down.
  • a viewing region e.g. a window region
  • two coating layers 3 and 4 in the form of opacifying layers have been laid down on the first surface 2a of the substrate.
  • both layers are provided only outside the curable material region R 1 , but in other cases there could be an overlap.
  • both coating layers 3, 4 are provided on the first surface 2a of the substrate 2.
  • the coating layer(s) may alternatively or additionally be disposed on the opposite surface 2b of the substrate. If coating layer(s) are to be provided on both sides of the substrate, the coating layer(s) may be applied to each side simultaneously or sequentially.
  • step S105 in which the coating layer(s) are applied may be carried out prior to the application of the curable material 11 (i.e. before step S101).
  • the coating layer(s) could be applied after the curable material 11 has been applied but before it is formed and cured (i.e. between steps S101 and S103).
  • a masking substance 15 is applied to the first surface 2a of the substrate, as shown in Figure 4d .
  • the masking substance 15 is laid down across areas of the substrate in which the reflection enhancing material is ultimately not desired and, as such, the masking substance 15 can comprise any material which impedes adhesion of the reflection enhancing material 12 to the underlying substrate (and/or to any intervening layers, such as layers 3 and 4 in this example).
  • the masking substance 15 comprises an oil mask which de-gases when a material is laid down on top of it, thereby preventing its adhesion.
  • the masking substance 15 comprises a soluble mask, such as soluble ink.
  • soluble ink is heavily pigmented ink as disclosed in WO-A-99-13157 .
  • Mechanisms by which soluble masks operate vary but in one example, the pigment grains in the mask are sufficiently large that when a layer of metal or other reflection enhancing material is deposited on top of the ink, holes are formed through the deposited layer. As such, during subsequent washing with a solvent, the fluid can pass through the deposited layer, reaching and dissolving the pigment. This leads to detachment of the reflection enhancing material from the substrate in the regions where the soluble mask is present. Further examples of suitable soluble masks are given in US-A-5142383 , US-A-3935334 and EP-A-1023499 .
  • the application of masking substance 15 excludes a second region R 2 of the substrate, which second region R 2 includes at least part of the first region R 1 in which the cured material 11 carrying the relief structure is present.
  • the second region R 2 is coincident with the first region R 1 , but this is not essential.
  • the reflection enhancing material is deposited onto the first surface 2a of the substrate 2 to form a layer of reflection enhancing material 12 which extends over the cured material 11 and neighboring regions of the substrate, including portions covered by masking substance 15 as shown in Figure 4e .
  • the reflection enhancing material 12 may not settle on the masking substance.
  • the deposition step S109 may result directly in the structure shown in Figure 4f , in which the reflection enhancing material is present only on the cured material 11.
  • some residual reflection enhancing material 12 may remain on the masking substance 15 in which case a removal step, such as washing step S111, may be performed.
  • a removal step such as washing step S111.
  • This may involve for example washing the surface of substrate 2 with a liquid (e.g. water) or a gas, such as an air jet.
  • a liquid e.g. water
  • a gas such as an air jet.
  • This causes detachment of the reflection enhancing material 12 from the substrate in the areas where masking substance 15 is present, resulting in the same final structure shown in Figure 4f .
  • the region of the cured material 11 to which the reflection enhancing material 12 is applied i.e. the overlapping parts of regions R 1 and R 2 , termed the third region, R 3 ) exhibits the desired optically variable effect.
  • the reflection enhancing material 12 deposited in step S109 is preferably a contiguous film of a suitable reflective material, such as a metal or alloy or an HRI material, so as to achieve high quality optical replay.
  • the material is preferably deposited by a non-selective method, such as vapour or vacuum deposition, in which the whole surface of the substrate that is exposed to the process will be coated with the material (as opposed to a selective application process such as printing).
  • the material may be deposited by a physical vapour deposition process such as evaporative deposition or sputtering, or a chemical vapour deposition process.
  • the previously laid down components i.e. the curable material 11, coating layers 3 and 4 and masking substance 15
  • the previously laid down components are laid down at controlled locations using preferably a printing technique such as gravure, intaglio, lithographic printing etc., so that the extent and position of each can be precisely controlled.
  • the printing or other application techniques used in steps S101, S103, S105 and S107 are performed in register with one another such that the curable material 11, coating layers 3 and 4 and masking substance 15 (and therefore the ultimate position of reflection enhancing material 12) are registered to one another. That is, on a series of like documents produced in the same way, the relative locations of these components of the documents will be substantially identical.
  • Particularly high registration can be achieved by performing steps S101, S103, S105 and S107 in an inline process with, for example, substrate 2 travelling as a web between stations at which each of the steps is carried out.
  • substrate 2 travelling as a web between stations at which each of the steps is carried out.
  • the positioning of the substrate 2 relative to each of the stations is known and can be controlled.
  • the curable material 11, coating layers 3 and 4 and masking substance 15 are each applied by gravure, registration tolerances of +/-100 to 200 microns are achievable.
  • the steps of applying the curable material, forming the relief and curing, applying the one or more coating layers and applying the masking substance are preferably carried out in an inline process, and Figure 5a shows an example of suitable apparatus for such a process.
  • Subsequent steps involving deposition of the reflection enhancing material can be carried out as continuation of the process or in a separate manufacturing line. Since all of the printing or other application type steps for which accurate registration is desirable are carried out before the steps involving deposition of the reflection enhancing material, the method lends itself well to carrying out manufacture in two distinct phases and in this example these are reflected by the division between Figures 5a and 5b .
  • Figure 5a depicts an exemplary apparatus 30 for carrying out steps S101 to S107 of the method described with respect to Figures 3 and 4 .
  • the substrate 2 such as a transparent polymer film
  • the substrate 2 is supplied from a reel 31.
  • a curable material 11 is applied to the substrate 2 preferably over discrete regions R 1 (although in other cases the region R 1 may effectively cover the whole substrate 2).
  • the curable material 11 is a radiation curable material.
  • the station 32 may comprise for example a print roller 32a and an opposing roller 32b.
  • the substrate 2 is then conveyed to second station 33 where a relief structure 13 is formed.
  • the station 33 comprises a rotary embossing roller 33a carrying a repeating pattern of the desired relief structure 13, and opposing roller 33b such as a transparent quartz nip roller.
  • the relief 13 is impressed into the curable material 11 which is simultaneously exposed to curing energy E, such as UV radiation.
  • curing energy E such as UV radiation.
  • the radiation source E is disposed within the transparent nip roller 33b. As such, curing takes place at the point of impression of the relief structure 13 into the curable material.
  • radiation source E may be located just after the web leaves the impressing nip, e.g. between rollers 33a and 33b.
  • the web now carrying a series of cured regions 11 each having an impressed surface relief 13, now passes to a third station 34 at which one or more coating layers (such as 3 and 4 depicted in previous Figures) are applied to the substrate 2 to define a viewing region within which at least part of the cured material is located, on one or both sides of the substrate 2.
  • Station 34 may comprise for example a print roller 34a and an opposing roller 34b. In practice, more than one such station may be provided if multiple coating layers are to be applied.
  • a masking substance 15 is applied to the first surface 2a of the substrate 2, so as to mask off areas in which reflection enhancing material is not desired.
  • the area to which the masking substance 15 is applied excludes a second region R 2 at least partially overlapping with the cured surface relief regions.
  • Figure 5b depicts exemplary apparatus for carrying out deposition of reflection enhancing material and an optional washing step.
  • reel 41 supplies the substrate 2 in the form of the intermediate product resulting from the manufacturing stages already described.
  • the web is conveyed through a fifth processing station 42 which in this example comprises a vapour deposition chamber 42a for depositing reflection enhancing material such as metal or a HRI material on to the first surface 2a of the substrate.
  • the reflection enhancing material may be deposited across the full width of the web as it passes through the chamber.
  • a step of removing residual reflection enhancing material from regions in which it is not desired is useful and in this case the web may be conveyed through a sixth processing station 43, here comprising a washing chamber 43a in which the first surface of the substrate is subjected to washing, e.g. by passing the web through a fluid bath or directing air jets onto the surface of the web.
  • the completed web may then be collected on a reel 44.
  • Optional onward processing steps will depend on the nature of the security document in question but may comprise for example one or more further printing steps (e.g. application of further coating layer(s) and/or graphics layer 5) and/or cutting of the web into individual security documents each carrying one security device manufactured in the above described manner.
  • the apparatus may also include additional stations for carrying out optional steps such as surface treatment of the substrate 2 and/or cured material 11.
  • a station may be provided upstream of station 32 for treating the substrate 2 so as to improve adhesion of the curable material and/or coating layers to its surface. This may be achieved for example by applying a print receptive primer such as layer 9 shown in Figure 1 or carrying out corona treatment.
  • a treatment station may be inserted at any stage downstream of station 33 for treating the surface of cured material 11 prior to application of the reflection enhancing material, e.g. by plasma or corona treatment.
  • the application of the curable material and the application of the one or more coating layers defining the viewing region may be carried out in the opposite order to that depicted in Figure 5a , in which case the relevant processing stations will be rearranged as appropriate.
  • a further embodiment of a security document 1 comprising an integral security device 10' will now be described with reference to Figures 6 and 7 .
  • the construction of security document 1, including substrate 2, coating layers 3 and 4 and print 5 is the same as discussed with respect to Figures 1 and 2 , and like features are identified using the same reference numbers.
  • the security device 10' is formed using the same technique as described above.
  • a reflection enhancing material 12 is disposed on cured material 11 and follows a surface relief 13 defining an optically variable effect generating structure.
  • reflection enhancing material 12 does not cover the whole region R 1 in which the cured material 11 is present, but rather (as shown best in the plan view seen by observer A, shown in Figure 7 ), only a portion thereof.
  • the cured material 11 covers a region R 1 having the form of a six-pointed star shape whilst the reflection enhancing material 12 is provided only across an area R 2 within region R 1 , having the shape of an arrow symbol.
  • the region R 2 is that region omitted by the coverage of masking substance 15 during manufacture.
  • the optically active region R 3 therefore shares the same bounds as R 2 .
  • the regions R 1 and R 3 preferably define different indicia. If the cured material 11 is clear and colourless, the star-shaped region R 1 will not be visible to the observer. However, in this embodiment the cured material 11 comprises an optically effective substance such as a colorant, making it visible to observers A and B. The colorant will also have the effect of causing the device to have different optically variable appearances from the point of view from observer A and observer B, since observer A will see the optical effect through colourless protective lacquer 19, meaning that the colour of the effect will be determined solely by that of reflection enhancing material 12, whereas observer B will see the optically variable effect through the cured material 11 which will therefore impose its colour onto the optically variable effect.
  • an optically effective substance such as a colorant
  • the optically effective substance in the cured material 11 could comprise any visible colorant and/or any non-visible but machine detectible substance and/or a substance which only becomes visible under certain conditions, such as UV illumination.
  • the optically effective substance could be a luminescent, fluorescent or phosphorescent material.
  • the reflection enhancing material 12 and/or substrate 2 may also comprise an optically effective substance such as these.
  • the security level of the document can be further increased by forming the layer 11 from two or more transparent curable materials, and this is the case in the embodiment depicted in Figures 6 and 7 , where one portion of region R 1 is formed of a first curable material 11a and another portion of the region is formed with a second curable material 11b.
  • the two or more curable materials preferably comprise different optically effective substances so that a pattern formed by the two curable materials is visible to a human observer and to a machine. It is preferred that where two or more materials are provided in this way, they are each responsive to the same form of curing energy so that both can be cured simultaneously in step S103.
  • Figures 8 , 9 and 10 depict cross-sections through three further embodiments of security documents illustrating further optional features.
  • the substrate 2 of the document is transparent and this is preferred in order to provide document with features such as see-through windows or translucent half-windows which have a high recognition value and thus increase the security level of the document.
  • the polymeric substrate could be translucent or opaque and this is the case in the Figure 8 embodiment.
  • the security device 10" is only designed to be viewed from one side (that of observer A) and thus the coating layers 3b, 4b and print 5b on the second surface 2b of the substrate 2' may be continuous in the region of the security device 10".
  • the viewing region 20' has the same opacity as its surroundings and a similar result could be achieved using a transparent or translucent substrate 20 in combination with all-over coating layers 3b, 4b of sufficiently high opacity.
  • the security device 10" is constructed in substantially the same manner as described above.
  • the second region R 2 across which the masking substance 15 is omitted during manufacture extends beyond the edges of the first region R 1 in which the curable material 11 is deposited.
  • the reflection enhancing material 12 may extend beyond the perimeter of the cured material 11 carrying the surface relief 13.
  • the optically active third region R 3 is equal to the first region R 1 .
  • FIG. 9 shows an exemplary embodiment in which it is advantageous to apply certain coating layers prior to application of the reflection enhancing material, and others after.
  • the security document 1" is provided with a security device 10"' which is designed to be viewed only through the substrate 2 (which must therefore be transparent), through viewing region 20" from the position of observer B.
  • the curable material 11 is also transparent and the optically variable effect generated by relief structure 13 can thus be viewed through the curable material 11 and the transparent substrate 2.
  • the security device is manufactured using the same method as described above but, in the process step corresponding to step S105 shown in Figure 3 , only coating layers 3b and 4b are applied (to the second surface of the substrate 2), since it is only these layers which define viewing region 20". At this stage, no coating layers are applied to the first surface of the substrate 2 which is to carry curable material 11. Thus, the relief structure 13 remains available for deposition of the reflection enhancing material 12. After the reflection enhancing material 12 has been applied to the desired region, further coating layers 3a, 4a are applied all-over the first surface of the substrate, including over security device 10"'.
  • the coating layers 3a, 4a may or may not be of the same number and/or composition as the coating layers 3b, 4b.
  • the viewing region 20" will act as a half-window, becoming distinguishable from its surroundings when viewed in transmitted light.
  • the coating layers 3a, 4a are sufficiently opaque (in combination)
  • the viewing region may not have the characteristics of a window, exhibiting the same opacity as its surroundings and hence not being distinguishable in transmitted light.
  • the coating layers 3a, 4a are continuous all over the surface of the substrate, there is no need for accurate registration between those layers and other features of the document, hence the ability to apply those layers after deposition of the reflection enhancing material.
  • the same would apply to any other coating layers which do not contribute to the definition of the viewing region 20, e.g. partial coating layers which are only applied in areas sufficiently spaced away from the viewing region.
  • Figure 10 shows a further example of a security document 1"' in which the security device 10 is identical to that discussed with respect to Figure 1 .
  • the security device 10 is located in a "half window" region 20'" of the document, with coating layers 3 and 4 on the first surface of the document being omitted across the region in which the security device is present whilst the coating layers 3b and 4b are continuous across the same region on the opposite side of the substrate.
  • the optical effect of security device 10 is only clearly visible from one side of the document (that of observer A), but depending on the opacity of layers 3b and 4b, from the opposite side the half window region may be apparent as a relatively light or translucent region, and the optical effect generated by relief 13 may also be visible to an extent.
  • the coating layers 3a, 4a will be laid down prior to deposition of the reflection enhancing material, but the coating layers 3b, 4b could be laid down at the same time or at a later stage. This is because only coating layers 3a, 4a define the viewing region (half-window) 20'" whilst layers 3b, 4b are all-over and so do not require accurate registration.

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Claims (11)

  1. Verfahren zum Herstellen eines Sicherheitsdokuments, das Folgendes umfasst:
    (a) Bereitstellen eines Polymersubstrats (2) mit einer ersten (2a) und einer zweiten (2b) Oberfläche;
    dann Ausführen der folgenden Schritte (b), (c) und (d) in beliebiger Reihenfolge:
    (b) Auftragen eines aushärtbaren Materials (11) auf einen ersten Bereich (R1) des Substrats auf seiner ersten Oberfläche;
    (c) Formen des aushärtbaren Materials derart, dass seine vom Substrat entfernte Oberfläche den Konturen einer einen optisch veränderlichen Effekt erzeugenden Reliefstruktur (13) folgt, und Aushärten des aushärtbaren Materials, sodass die Reliefstruktur von dem ausgehärteten Material gehalten wird;
    (d) Auftragen von einer oder mehreren Beschichtungsschichten (3,4,5) auf die erste und/oder die zweite Oberfläche des Substrats, um einen Betrachtungsbereich zu definieren, wobei die Beschichtungsschicht(en) mindesten auf der ersten Oberfläche auf dem gesamten oder einem Teil von dem ersten Bereich fehlt bzw. fehlen; gekennzeichnet durch dann:
    (e) Auftragen einer Maskierungssubstanz auf die erste Oberfläche des Substrats, wobei mindestens ein zweiter Bereich (R2) ausgeschlossen wird, der mindestens einen Teil des ersten Bereichs enthält, wobei die überlappenden Abschnitte des ersten und des zweiten Bereichs einen dritten Bereich (R3) definieren;
    (f) Abscheiden eines reflexionsverstärkenden Materials (12) auf der ersten Oberfläche des Substrats, sodass im dritten Bereich das reflexionsverstärkende Material auf dem ausgehärteten Material abgeschieden wird und den Konturen der Reliefstruktur folgt; wobei die Maskierungssubstanz das Halten des reflexionsverstärkenden Materials behindert, sodass das reflexionsverstärkende Material nur in Bereichen gehalten wird, auf die die Abdecksubstrat nicht aufgetragen wurde.
  2. Verfahren nach Anspruch 1, wobei Schritt (f) weiter folgendes umfasst:
    (f1) Waschen des Substrats, um etwaiges restliches reflexionsverstärkendes Material in Bereichen zu entfernen, auf die die Maskierungssubstanz aufgetragen wurde.
  3. Verfahren nach Anspruch 1 oder Anspruch 2, wobei die Maskierungssubstanz eine Ölmaske umfasst, die derart angepasst ist, das das Auftragen des reflexionsverstärkenden Materials darauf das Entgasen der Ölmaske bewirkt, wodurch die Haftung des reflexionsverstärkenden Materials an dem Substrat behindert wird.
  4. Verfahren nach Anspruch 1 oder Anspruch 2, wobei die Maskierungssubstanz eine lösliche Maske umfasst, die nicht fest an dem Substrat haftet oder durch Auftragen eines Lösungsmittels aufgelöst werden kann, wodurch die Haftung des darauf aufgetragenen reflexionsverstärkenden Materials an dem Substrat behindert wird.
  5. Verfahren nach einem der vorangehenden Ansprüche, wobei in Schritten (b), (d) und (e), das aushärtbare Material, die Beschichtungsschichten und die Maskierungssubstanz jeweils in Register miteinander und vorzugsweise in Register mit der in Schritt (c) gebildeten Reliefstruktur aufgetragen werden.
  6. Verfahren nach einem der vorangehenden Ansprüche, wobei mindestens Schritte (b), (c), (d) und (e) in einem kontinuierlichen Inline-Prozess ausgeführt werden.
  7. Verfahren nach einem der vorangehenden Ansprüche, wobei in Schritt (f) das reflexionsverstärkende Material durch eine nicht selektive Abscheidetechnik abgeschieden wird.
  8. Verfahren nach einem der vorangehenden Ansprüche, wobei in Schritt (f) das reflexionsverstärkende Material durch Gasphasenabscheidung abgeschieden wird.
  9. Verfahren nach einem der vorangehenden Ansprüche, wobei es sich bei dem reflexionsverstärkenden Material um ein Metall oder eine Legierung oder um ein Material mit einem Brechungsindex, der von dem des ausgehärteten Materials um mindestens 0,3 verschieden ist, handelt.
  10. Verfahren nach einem der vorangehenden Ansprüche, wobei die eine oder mehreren in Schritt (d) aufgetragenen Beschichtungsschichten eine oder mehrere Trübungsschichten umfassen.
  11. Verfahren nach einem der vorangehenden Ansprüche, wobei es sich bei dem Sicherheitsdokument um eine Banknote, ein Polymerbanknote, eine Hybrid-Papier-Polymerbanknote, ein Ausweisdokument, einen Reisepass, eine Ausweiskarte, einen Scheck, ein Visum, eine Urkunde oder ein Wertzeichen handelt.
EP14725517.8A 2013-05-17 2014-05-15 Verfahren zur herstellung von sicherheitsdokumenten Not-in-force EP2996885B2 (de)

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AU2014266990C1 (en) 2019-04-04
AU2014266990A1 (en) 2015-11-12
CN105339181A (zh) 2016-02-17
CN105339181B (zh) 2018-02-09
GB2514337A (en) 2014-11-26
WO2014184559A8 (en) 2015-06-11
EP2996885B1 (de) 2017-06-21
GB201308959D0 (en) 2013-07-03
GB2514337B (en) 2020-01-15
MX346632B (es) 2017-03-27
MX2015015141A (es) 2016-02-18
EP2996885A1 (de) 2016-03-23
WO2014184559A1 (en) 2014-11-20
AU2014266990B2 (en) 2018-03-08

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