WO2005121450A1 - Dispositif de securite a couche polymere activable a une temperature specifiee - Google Patents

Dispositif de securite a couche polymere activable a une temperature specifiee Download PDF

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Publication number
WO2005121450A1
WO2005121450A1 PCT/GB2005/002283 GB2005002283W WO2005121450A1 WO 2005121450 A1 WO2005121450 A1 WO 2005121450A1 GB 2005002283 W GB2005002283 W GB 2005002283W WO 2005121450 A1 WO2005121450 A1 WO 2005121450A1
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WO
WIPO (PCT)
Prior art keywords
security device
security
layer
activation temperature
opaque
Prior art date
Application number
PCT/GB2005/002283
Other languages
English (en)
Inventor
John Philip Winchcombe
Christopher John Eastell
Original Assignee
De La Rue International Limited
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by De La Rue International Limited filed Critical De La Rue International Limited
Priority to PL05750378T priority Critical patent/PL1753915T3/pl
Priority to EP05750378A priority patent/EP1753915B1/fr
Priority to AU2005252433A priority patent/AU2005252433A1/en
Priority to DE602005003666T priority patent/DE602005003666T2/de
Publication of WO2005121450A1 publication Critical patent/WO2005121450A1/fr

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Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
    • D21H21/14—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties characterised by function or properties in or on the paper
    • D21H21/40—Agents facilitating proof of genuineness or preventing fraudulent alteration, e.g. for security paper
    • D21H21/42—Ribbons or strips
    • 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
    • B42D25/36—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
    • B42D25/355—Security threads
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
    • D21H21/14—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties characterised by function or properties in or on the paper
    • D21H21/40—Agents facilitating proof of genuineness or preventing fraudulent alteration, e.g. for security paper
    • D21H21/44—Latent security elements, i.e. detectable or becoming apparent only by use of special verification or tampering devices or methods
    • D21H21/48—Elements suited for physical verification, e.g. by irradiation
    • G—PHYSICS
    • G07—CHECKING-DEVICES
    • G07D—HANDLING OF COINS OR VALUABLE PAPERS, e.g. TESTING, SORTING BY DENOMINATIONS, COUNTING, DISPENSING, CHANGING OR DEPOSITING
    • G07D7/00—Testing specially adapted to determine the identity or genuineness of valuable papers or for segregating those which are unacceptable, e.g. banknotes that are alien to a currency
    • G07D7/003—Testing specially adapted to determine the identity or genuineness of valuable papers or for segregating those which are unacceptable, e.g. banknotes that are alien to a currency using security elements
    • B42D2033/26—

Definitions

  • the present invention relates to improvements in security devices that can be used in varying shapes and sizes for authenticating or security applications.
  • the invention refers to a durable security device comprising a layer that switches from opaque to transparent at a specified temperature.
  • banknotes security elements in the form of strips or threads which are made from a transparent film provided with a continuous reflective metal layer, vacuum deposited aluminium on polyester film being the commonest example.
  • Banknotes made using such security devices have been in general circulation in many countries for many years.
  • security elements When such security elements are embedded in security paper and the paper is subsequently printed to provide the security document, e.g. a banknote, the security element cannot readily be discerned in reflected light but is immediately apparent as a dark image when the document is viewed in transmitted light.
  • Such security elements are extremely effective against counterfeiting by printing or photocopying, since the optically variable effect which is provided cannot be accurately simulated, for example by printing a line on the paper.
  • Typical security elements are composed of a polymeric film, such as polyester, which may be metallised or coloured and may include microprinted lettering denoting a title or message.
  • the lettering can be produced by printing onto the substrate or by de-metallising a metallic layer on the substrate.
  • a microprinted security thread can be found in GB-A-1095286.
  • the security element can be slit to produce either registered lettering with respect to the edge of the thread, or unregistered lettering designed so that the message always appears irrespective of thread slitting.
  • the widths of security elements typically used vary from 0.5 mm to 6.0 mm and may have thicknesses typically ranging from 12 micrometres up to 50 micrometres.
  • the positioning of the security element within the document may be strictly controlled to predetermined criteria and may be concurrent with additional security features, such as a watermark.
  • Security elements may be fully embedded within security paper in such a way that paper fibres cover both sides of the security elements, making it considerably less visible in reflective light, but clearly visible in transmitted light.
  • a security element comprising a thin layer of aluminium on a plastic support which is exposed on one side of the sheet at intervals along the length of the security element, the region of exposure being referred to as a "window”.
  • GB-A-1552853 and GB-A-1604463 disclose banknotes containing such windows. Paper for use in producing such banknotes can be made using the method disclosed in EP-A-0059056.
  • the dimensions of the windows typically used are from 3 mm to 14 mm lengthways, with "bridges", being the areas of the paper substrate covering the security element between the windows, ranging from 4 mm to 30 mm there between. Again, the positioning of the windows may be controlled to allow registration of the window with respect of the document and other security features such as watermarks.
  • banknote of this type provides added security against counterfeiters as, when viewed in transmitted light, the security element is seen as a dark line and when viewed in reflected light on the appropriate side, the bright shining aluminium portions which are exposed at the windows are readily visible.
  • security elements in use are coated with protective lacquers and these may contain, for example, fluorescent inks which are only visible on illumination with ultra violet light of a specific wavelength, e.g. 366 nm. It is also possible to make security elements, that are machine-readable by incorporating into or onto the substrate, substances which can be identified by a detector, such as magnetic material.
  • each layer may be coated with metal such as aluminium, stainless steel, tin and/or metal oxide such as tin oxide.
  • the coating may be protected with a lacquer which may also contain coloured or invisible luminescent pigments, for example, rare earth chelates, such as europium acetylacetonate and the like.
  • EP-A-0608078 discloses a security thread containing a thermochromic coating which changes from a coloured state to a colourless state to reveal underlying indicia.
  • WO-A- 0116426 discloses a security element also containing a thermochromic layer, which is combined with a second layer such as an optically variable layer or a machine- readable layer.
  • thermochromic layer is applied over a metallised holographic device, such that on heating above a certain temperature the thermochromic layer is activated so that it becomes transparent and reveals the underlying hologram.
  • thermochromic liquid crystal materials that become transparent or opaque when warmed and their application in security elements.
  • FR2698390 describes the use of piezochromic materials in an authenticating element such that a reversible change occurs from an opaque state to a transparent state under the action of a pressure.
  • Thermochromic materials can be divided into two categories; leucodye thermochromics and liquid crystal thermochromics.
  • leucodye thermochromics used in security inks, coatings and devices is limited due to its very poor lightfastness, while the liquid crystal thermochromic and piezochromic materials require expensive and complex processing not suitable for mass produced articles.
  • a security device for use with a security document comprising an activatable layer of polymeric material comprising a hard segment and crystallisable soft segment or at least one soft segment which is crosslinked and contains a crystallisable soft segment, said segments being selected to provide a predetermined activation temperature whereby the layer is opaque at temperatures below the activation temperature and becomes transparent at temperatures above the activation temperature.
  • the present invention provides a significant improvement over the prior art in that it is very durable and easy to process.
  • FIG. 1 is a cross sectional side elevation of a security device according to the present invention in the form of an embedded security element, on the line I-I of Figures 2 and 3;
  • Figures 2 and 3 are plan views of a security document incorporating the security element of Figure 1 under different viewing conditions;
  • Figure 4 is a cross sectional side elevation of an alternative embodiment of a security device in the form of a windowed security element, on the line IV-IV of Figures 5 and 6;
  • Figures 5 and 6 are plan views of a security document incorporating the security element of Figure 4 under different viewing conditions;
  • Figures 7 and 8 are cross sectional side elevations of further alternative embodiments of the security device in the form of a windowed security element;
  • Figure 9 is a cross sectional side elevation of the security device of Figure 8 on a transfer material so that the device can be used in the form of a patch or stripe;
  • Figure 10 is a cross sectional side elevation of another alternative embodiment of a security
  • the security device of the current invention utilises a polymeric film or coating that switches from opaque to transparent at a specified temperature.
  • the polymeric systems suitable for use in the current invention comprise at least one hard segment and at least one crystallisable soft segment, or alternatively at least one kind of soft segment which is cross-linked and contains a crystallisable soft segment, without the presence of a hard segment.
  • the term "segment” refers to a block or sequence of polymer forming part of the polymeric system. Such polymeric systems are used in shape memory polymers and have been described in detail in US-B-6720402.
  • the term “segment” refers to a block or sequence of polymer forming part of the polymeric system.
  • the terms hard segment and soft segment are relative terms, relating to the softening point (melting point or glass transition " temperature) of the segments.
  • the hard segment (s) has a higher softening point than the soft segment (s) .
  • the polymeric systems suitable for the current invention can be thermoplastic, thermoset, interpenetrating networks, semi-interpenetrating networks, or mixed networks.
  • Polymers can be a single polymer or a blend of polymers.
  • Polymers can be linear, branched, thermoplastic elastomers with side chains or any kind of dendritic structural elements.
  • the security device utilises a thermoplastic polymeric film or coating.
  • the thickness of the thermoplastic polymeric film or coating is in the range 0.5-100 ⁇ m and more preferably in the range l-30 ⁇ m.
  • the thermoplastic polymer is constructed such that when in the form of a film or coating the hard segment is substantially transparent and the soft segment is substantially opaque due to its high degree of crystallinity) . In this case the film or coating will appear opaque below the melting point of the crystalline soft segment and will become substantially transparent when heating above the melting point of the soft segment.
  • the hard and soft segments are preferably oligomers.
  • the term oligomer refers to a linear chain molecule having a molecular weight up to 15000 Daltons.
  • the polymers forming the segments are selected based on the desired softening temperatures.
  • the activation temperature i.e. the melting point of the soft segment, can be controlled by changing the monomer composition and the kind of monomer.
  • the activation temperature is in the range 25°C to 80°C, preferably 30°C to 50°C.
  • the material can be formulated such that the switch from opaque to transparent occurs at body temperature, -35- 37°C, and therefore can be activated by touch.
  • the security device of the present invention utilises a thermosetting polymeric film or coating.
  • the thickness of the thermosetting polymeric film or coating is in the range 0.5-100 ⁇ m and more preferably in the range l-30 ⁇ m.
  • a thermosetting polymeric system suitable for the current invention comprises a covalently cross-linked network, comprising one or more soft segments, and a crystallisable switching segment (soft segment).
  • the activation temperature, at which the thermosetting polymeric film or coating switches from opaque to transparent, is the melting temperature of the crystalline switching element.
  • the activation temperature is in the range 25°C to 80°C, preferably 30°C to 50°C.
  • the material can be formulated such that the switch from opaque to transparent occurs at body temperature, ⁇ 35-37°C, and therefore can be activated by touch.
  • polymer segments that are suitable for this invention include, but are not limited to, polyamides, polyester amides, poly(amino acid)s, synthetic poly(amino acids), polyanhydrides, polycarbonates, polycaprolactones, polyacrylates, polyalkylenes, polyacrylamides, polyalkylene glycols, polyalkylene oxides, polyalkylene terephthalates, polyortho esters, polyvinyl ethers, polyvinyl esters, polyvinyl halides, polyvinylpyrrolidone, polyesters, polylactides, polyglycolides, polysiloxanes, polyurethanes, ethylene vinyl acetate, poly (meth) acrylic acid, polyethylene, polypropylene, polystyrene, polyvinyl chloride, polyvinylphenol, and copo
  • thermoplastic polymer systems comprising a soft segment with a high degree of crystallinity and a substantially transparent (that is to say predominantly amorphous) hard segment are detailed in a review article "Shape Memory Polymers” in Angew. Chem. Int. Ed. 2002, 41, 2034-2057.
  • One particular example suitable for the current invention is a segmented block copolyester urethane containing physical cross-links (hard segment) and a crystallisable soft segment comprising polycapralactone units.
  • thermosetting polymer systems comprising a cross-linked network of one or more soft segments, and a crystallisable switching segment (soft segment) can be found in the same "Shape Memory Polymer” review article.
  • One particular example is an AB polymer network based on oligo ( ⁇ -caprolactone) diols as the component that forms a crystallisable switching element.
  • the oligo ( ⁇ -caprolactone) diols are functionalised with end groups to form a soft segment that can undergo a polymerisation reaction.
  • the oligo (e- caprolactone) dimethacrylate segments are then combined with n-butyl acrylate to form the polymer network.
  • the molecular weight ' of the two segments control the crystallinity, the activation temperature and the mechanical properties.
  • the polymeric material of the current invention can be produced as a film or as a coating and therefore can be incorporated into a security substrate which is used to manufacture a document of value, such as a banknote, using a number of known processes.
  • the polymeric material is incorporated into a security device such as a thread, stripe or patch in the form of a substrate or as a coated layer.
  • a security device such as a thread, stripe or patch in the form of a substrate or as a coated layer.
  • such a device is applied to the surface of a document, as in the case of a stripe or patch.
  • it is partially embedded into the document so that it is visible only partly on the surface of the document in the form of a windowed security element.
  • the device is incorporated into the document such that regions of the device are viewable from the both sides of the document.
  • EP-A-1141480 One method for incorporating a security device such that it is viewable from both sides of the document is described in EP-A-1141480.
  • the polymeric material is applied directly to the surface of the document of value as an ink or coating.
  • the function of the polymeric layer of the current invention is to switch from opaque to transparent at a set activation temperature.
  • the switch from opaque to transparent can in itself act as a security feature but in preferred embodiments it is used in combination with a second security element/layer which has further properties which can be checked by either public,- teller and/or machine to authenticate the device.
  • security elements/layers include, but are not limited to, holograms, colour shifting optical effect pigments, colour shifting liquid crystal films, demetallised designs, printed indicia, luminescent pigments and magnetic ink and codings.
  • FIG. 1 to 3 there is shown a cross- section of a security device 10 for incorporation into a security document 11 as an embedded thread 17.
  • the security device 10 comprises a polymeric film 12 of the type described above that switches from opaque to transparent at a set activation temperature.
  • the polymeric film 12 has been metallised, using vapour deposited aluminium to provide a metal layer 13, and contains demetallised indicia 14 by a method, such as that described in EP-A-0319157.
  • the vapour deposited metallised layer 13 can be replaced with a metallic conductive or non-conductive ink applied in a non-continuous manner to provide indicia.
  • the coating 15 may be applied, by a number of techniques using, for example, a roll coater or alternatively using a printing press by flexographic, offset lithographic or gravure techniques.
  • An adhesive layer 16 is then- applied to both sides of the security device 10 to promote bonding of the device 10 to the secure substrate, from which the secure document 11 is made, during manufacture.
  • FIG 4 An alternative construction is shown in Figure 4 in which a metallised polyester film 20, with demetallised indicia 14, is coated on both sides with a polymeric coating 15 that switches from opaque to transparent at a set activation temperature.
  • An adhesive 16 is then applied to both sides of the security device 10 to promote bonding of the device 10 to the secure substrate, from which the secure document 11 is made, during manufacture.
  • Figure 5 and 6 illustrate the incorporation of such a device 10 into a secure document 11 as a windowed thread 17. In reflected light the thread 17 can be seen in the windows 18 having the opaque white colour of the polymeric coating 15 ( Figure 5) . In transmitted light the visibility of the thread 17 is considerably reduced due to the opaque white appearance of the polymeric coating 15.
  • the polymeric coatings 15 switch from opaque to transparent revealing the negative indicia 14 when viewed in transmitted light ( Figure 6) .
  • the windows 18 switch from white opaque to metallic with light lettering or indicia.
  • the security device 10 comprises a polymeric film 12 that switches from opaque to transparent at a set activation temperature.
  • the polymeric film 12 has been metallised, using vapour deposited aluminium 13, and contains demetallised indicia 14 by the method such as that described in EP-A-0319157.
  • the vapour deposited metallised layer can be replaced with a metallic conductive or non-conductive ink applied in a non-continuous manner to provide indicia.
  • An adhesive 16 is then applied to both sides of the security device 10 to promote bonding of the device 10 to the secure substrate, from which the secure document 11 is made, during manufacture.
  • demetallised indicia 14 appearing opaque white on a metal background, can be viewed in the windows 18.
  • the visibility of the thread 17 in the embedded regions of the thread 17 is considerably reduced. If the thread 17 is positioned metal side down, then the thread 17 can be seen in the windows 18 in reflected light as a white opaque strip.
  • the polymeric film 15 becomes transparent. In reflected light the thread 17 can be viewed in the windows 18 as metallised strips with clear lettering or indicia. In transmitted light the thread 17 appears as a continuous dark line with clear lettering or indicia.
  • FIG 8 shows a cross-sectional view of a further embodiment of the security device 10 of the current invention.
  • the device 10 is intended for use as a security label and comprises a clear polymer substrate 20 such as polyester onto which is printed identifying indicia 22 using inks or dyes.
  • a set activation temperature preferably 35-37°C
  • An adhesive layer 16 is applied to one side of the device 10 and over this is applied a glassine carrier layer 19.
  • the glassine layer 19 allows the label to be easily removed for reapplication to a document, or other item requiring protection.
  • Figure 9 shows the label device 10 applied to a substrate.
  • the glassine layer is first removed to expose the adhesive layer 16.
  • the label device 10 is then applied to the substrate, the adhesive used may be a pressure sensitive or hot melt adhesive and may be permanent or temporary.
  • the use of temporary adhesives can be of use where a label needs to be removed and reapplied to another article. However, it is more likely that the label must be applied in a permanent manner.
  • the label may also be provided with other tamper evident features e.g. frangible substrate layers, kiss cuts, and the like.
  • FIG. 10 A further embodiment of the current invention is shown in Figure 10 in which a polymeric film 15 of the type described above that switches from opaque to transparent at body heat (35-37°C) is applied over a serial number 25 of a banknote 26.
  • the cross-section of the banknote 26 in the region of the polymeric film 15 is shown in Figure 10.
  • the polymeric film 15 can be prepared as a patch and applied using a release layer 24 and a carrier film 23 as is well known in the production of foil transfer devices, as described in US-A-4728377.
  • the serial number 25 is obscured (Figure 11) but becomes visible when the device 10 is warmed by touch and can be checked against a second serial number printed on the note ( Figure 12).
  • a polymeric coating 15 that switches from opaque to transparent at body heat (35-37°C) is printed over a serial number 25 of a banknote 26.
  • a serial number 25, or design can then be applied under the patch or film 12 by use of a suitable laser marking apparatus.
  • a suitable laser marking apparatus By tuning the power level of the laser correctly it should be possible to mark the surface of the banknote 25 without affecting the patch or polymeric film 12 on top. This can be made easier by printing the banknote 26 with a suitable laser marking additive (see Datalase from Sherwood Technology on their web site http: //www. sherwoodtech. com/index. asp) .
  • Such materials allow the use of a lower power laser and thus make it easier to mark through the patch or film 12 without affecting it.
  • the second not obscured number could also be applied by laser or by more normal processes such as letterpress. This would be a preferred approach as it would allow the numbering of the documents as a final step after all other print processes. This avoids the problem of having to renumber documents due to spoil during the application of the opaque to transparent polymer.
  • Figure 13 shows a further example of the current invention in which a polymeric film 12 that switches from opaque to transparent at body heat (35-37°C) is applied to a secure document 11 such that it partly covers an optically variable feature, such as a metallised hologram 30. On touch the covered part of the hologram 30 will be revealed ( Figure 14) and can be compared to the exposed section.
  • the polymeric film 15 can be prepared as a patch and applied using a release layer 24 and a carrier film 23 as described with reference to Figure 9.
  • Figure 15 shows an embodiment of a security device
  • the security device 10 comprises a polymeric coating 15, a thermoplastic lacquer embossed with a holographic structure 30, and a reflective aluminium layer 13 that ensures that the holographic structure 30 can be observed in reflection.
  • the multilayer structure is applied to a carrier strip 23, such that the carrier strip 23 and the polymeric coating 15 are separated by a release layer 24.
  • the reflective aluminium layer 13 can be replaced with a thin reflection enhancing layer for e.g. a thin transparent layer of zinc sulphide.
  • the security device 10 can be applied to the document 11 using an adhesive layer 16.
  • the adhesive layer 16 is applied either to the metal layer 13 or the surface of the secure document 11 to which the device 10 is to be applied. After transfer the carrier strip 23 is removed leaving the polymeric coating 15 as the exposed layer. On warming the security device 10 above the activation temperature, preferably 35-37°C, the polymeric coating 15 becomes transparent and reveals the hologram.
  • Figure 16 shows a further embodiment of the security device 10, suitable for application to a secure document 11 as a patch or a stripe, in which a polymeric coating 15 that switches from opaque to transparent at a set activation temperature is combined with a hologram.
  • the security device 10 comprises a polymeric layer 15,31, a thermoplastic lacquer embossed with a holographic structure 30, and a reflective aluminium layer 13 that ensures that the holographic structure 30 can be observed in reflection.
  • the polymeric layer 15,31 comprises a polymeric coating 15 that switches from opaque to transparent at 35-37°C applied in the form of indicia or any type of identifying information.
  • the remaining areas of the polymeric layer 15,31 comprise an opaque ink 31 which has the same visual appearance as the polymeric coating 15 when it is in its opaque state at room temperature.
  • the multilayer structure is applied to a carrier strip 23 in the same manner as described previously with reference to figure 15.
  • the reflective aluminium layer 13 can be replaced with a thin reflection enhancing layer for e.g. a thin transparent layer of zinc sulphide.
  • a security device 10 comprising a polymeric film 12 or coating 15 of the current invention can also be incorporated into a secure substrate 26 such that regions of the device 10 are viewable from the both sides of the substrate 26, or document made therefrom.
  • One method for incorporating a security device 10 such that it is viewable from both sides of the substrate 26 is described in EP-A-1141480.
  • a security thread 17 is selectively exposed on one side of the security substrate 26 and fully exposed on the second side to produce a window 18, as illustrated in Figure 17. This method allows for the insertion of considerably wider security threads 17 into substrates .
  • FIG 18 shows a cross-sectional view of a security device 10 that could be incorporated in the manner described in EP-A-1141480.
  • the security device 10 comprises a polymeric film 12 that switches from opaque to transparent at 35-37°C.
  • the polymeric film 12 has been metallised, using vapour deposited aluminium 13, and subsequently demetallised to form an identifying image.
  • An optional protective lacquer 34 can then be applied over the metallised layer 13.
  • the security thread 17 is adhered to the document 11 such that one side 32 is fully exposed on the front of the document ( Figure 19) and the other side 33 is exposed in a window 18 on the back of the document 11 ( Figure 20) .
  • the polymeric film 15 is opaque and when the security device 10 is viewed from the front of the document 11 in reflection a reflective metallised layer is observed containing a number of light demetallised images with an opaque white appearance

Abstract

L'invention concerne des perfectionnements apportés à des dispositifs de sécurité pouvant être utilisés sous des formes et des dimensions variées pour des applications d'authentification ou de sécurité. En particulier, l'invention concerne un dispositif de sécurité durable (10) comprenant une couche (12) qui passe d'opaque à transparente à une température spécifiée. Le dispositif de sécurité (10) comprend une couche activable (12) d'un matériau polymère comprenant un segment dur et un segment mou cristallisable, ou au moins un segment mou qui est réticulé et qui contient un segment mou cristallisable. Les segments sont sélectionnés pour fournir une température d'activation prédéterminée, de façon que la couche (12) soit opaque à des températures inférieures à la température d'activation et devienne transparente à des températures supérieures à la température d'activation.
PCT/GB2005/002283 2004-06-10 2005-06-09 Dispositif de securite a couche polymere activable a une temperature specifiee WO2005121450A1 (fr)

Priority Applications (4)

Application Number Priority Date Filing Date Title
PL05750378T PL1753915T3 (pl) 2004-06-10 2005-06-09 Zabezpieczenie z aktywowaną termicznie warstwą polimerową
EP05750378A EP1753915B1 (fr) 2004-06-10 2005-06-09 Dispositif de securite a couche polymere activable a une temperature specifiee
AU2005252433A AU2005252433A1 (en) 2004-06-10 2005-06-09 Security device with temperature activatable polymeric layer
DE602005003666T DE602005003666T2 (de) 2004-06-10 2005-06-09 Sicherheitsvorrichtung mit temperaturaktivierbarer polymerschicht

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GBGB0412981.3A GB0412981D0 (en) 2004-06-10 2004-06-10 Improvements in security devices
GB0412981.3 2004-06-10

Publications (1)

Publication Number Publication Date
WO2005121450A1 true WO2005121450A1 (fr) 2005-12-22

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PCT/GB2005/002283 WO2005121450A1 (fr) 2004-06-10 2005-06-09 Dispositif de securite a couche polymere activable a une temperature specifiee

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EP (1) EP1753915B1 (fr)
AT (1) ATE380268T1 (fr)
AU (1) AU2005252433A1 (fr)
DE (1) DE602005003666T2 (fr)
ES (1) ES2297722T3 (fr)
GB (2) GB0412981D0 (fr)
PL (1) PL1753915T3 (fr)
WO (1) WO2005121450A1 (fr)

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WO2008049632A1 (fr) * 2006-10-27 2008-05-02 Giesecke & Devrient Gmbh Élément de sécurité
DE102007005414A1 (de) * 2007-01-30 2008-08-07 Ovd Kinegram Ag Sicherheitselement zur Sicherung von Wertdokumenten
EP2119571A1 (fr) * 2008-05-15 2009-11-18 Hueck Folien Ges.m.b.H. Elément de sécurité tactile
WO2014029686A1 (fr) * 2012-08-23 2014-02-27 Bayer Materialscience Ag Document de sécurité et/ou de valeur comportant une fenêtre visuellement commutable pourvue d'un hologramme
WO2014055728A1 (fr) * 2012-10-05 2014-04-10 The Procter & Gamble Company Procédé de fabrication de structures de papier fibreuses utilisant des polymères à mémoire de forme à base d'eau

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GB2523994B (en) 2014-03-06 2017-08-30 De La Rue Int Ltd Method of forming a security document
CN109603941B (zh) * 2019-01-11 2021-08-03 京东方科技集团股份有限公司 微流控芯片系统及微流控芯片

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GB1552853A (en) 1976-09-24 1979-09-19 Bank Of England Authentication devices
GB1604463A (en) 1976-09-24 1981-12-09 Bank Of England Security devices
EP0059056A1 (fr) 1981-02-19 1982-09-01 Portals Limited Méthode de fabrication des feuilles en fibres
FR2698390A1 (fr) 1992-11-20 1994-05-27 Arjo Wiggins Sa Document de sécurité authentifiable par effet piezooptique.
EP0608078A1 (fr) 1993-01-20 1994-07-27 Portals (Bathford) Limited Fils de sécurité, et papier de sécurité les utilisant
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Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008049632A1 (fr) * 2006-10-27 2008-05-02 Giesecke & Devrient Gmbh Élément de sécurité
DE102007005414A1 (de) * 2007-01-30 2008-08-07 Ovd Kinegram Ag Sicherheitselement zur Sicherung von Wertdokumenten
EP1953002A3 (fr) * 2007-01-30 2009-07-01 OVD Kinegram AG Elément de sécurisation de documents de valeurs
US8257819B2 (en) 2007-01-30 2012-09-04 Ovd Kinegram Ag Security element for safeguarding value-bearing documents
EP3406457A1 (fr) * 2007-01-30 2018-11-28 OVD Kinegram AG Élément de sécurisation destiné à sécuriser les documents de valeur
EP2119571A1 (fr) * 2008-05-15 2009-11-18 Hueck Folien Ges.m.b.H. Elément de sécurité tactile
WO2014029686A1 (fr) * 2012-08-23 2014-02-27 Bayer Materialscience Ag Document de sécurité et/ou de valeur comportant une fenêtre visuellement commutable pourvue d'un hologramme
JP2015531705A (ja) * 2012-08-23 2015-11-05 バイエル・マテリアルサイエンス・アクチェンゲゼルシャフトＢａｙｅｒ ＭａｔｅｒｉａｌＳｃｉｅｎｃｅ ＡＧ ホログラムによって視覚的に変化可能な窓を含む機密書類および／または貴重書類
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WO2014055728A1 (fr) * 2012-10-05 2014-04-10 The Procter & Gamble Company Procédé de fabrication de structures de papier fibreuses utilisant des polymères à mémoire de forme à base d'eau
US8815054B2 (en) 2012-10-05 2014-08-26 The Procter & Gamble Company Methods for making fibrous paper structures utilizing waterborne shape memory polymers
US8980057B2 (en) 2012-10-05 2015-03-17 The Procter & Gamble Company Fibrous paper structures utilizing waterborne shape memory polymers

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PL1753915T3 (pl) 2008-05-30
AU2005252433A1 (en) 2005-12-22
GB2414962A (en) 2005-12-14
GB0511753D0 (en) 2005-07-20
GB2414962B (en) 2006-05-17
EP1753915A1 (fr) 2007-02-21
DE602005003666D1 (de) 2008-01-17
ATE380268T1 (de) 2007-12-15
GB0412981D0 (en) 2004-07-14
ES2297722T3 (es) 2008-05-01
EP1753915B1 (fr) 2007-12-05
DE602005003666T2 (de) 2008-11-13

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