Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
  • B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
  • B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
  • B42D25/30—Identification or security features, e.g. for preventing forgery
  • B42D25/305—Associated digital information
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
  • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
  • B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
  • B05D7/50—Multilayers
  • B05D7/56—Three layers or more
  • B05D7/57—Three layers or more the last layer being a clear coat
  • B05D7/572—Three layers or more the last layer being a clear coat all layers being cured or baked together
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
  • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
  • B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
  • B05D3/02—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by baking
  • B05D3/0254—After-treatment
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
  • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
  • B05D5/00—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures
  • B05D5/06—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures to obtain multicolour or other optical effects
  • B05D5/061—Special surface effect
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
  • B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
  • B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
  • B42D25/30—Identification or security features, e.g. for preventing forgery
  • B42D25/36—Identification or security features, e.g. for preventing forgery comprising special materials
  • B42D25/364—Liquid crystals
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
  • B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
  • B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
  • B42D25/30—Identification or security features, e.g. for preventing forgery
  • B42D25/36—Identification or security features, e.g. for preventing forgery comprising special materials
  • B42D25/378—Special inks
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
  • B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
  • B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
  • B42D25/40—Manufacture
  • B42D25/45—Associating two or more layers
  • B42D25/455—Associating two or more layers using heat
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
  • B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
  • B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
  • B42D25/40—Manufacture
  • B42D25/45—Associating two or more layers
  • B42D25/46—Associating two or more layers using pressure
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
  • B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
  • B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
  • B42D25/40—Manufacture
  • B42D25/45—Associating two or more layers
  • B42D25/465—Associating two or more layers using chemicals or adhesives
  • B42D25/47—Associating two or more layers using chemicals or adhesives using adhesives
• • C—CHEMISTRY; METALLURGY
  • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
  • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
  • C09K9/00—Tenebrescent materials, i.e. materials for which the range of wavelengths for energy absorption is changed as a result of excitation by some form of energy
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
  • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
  • B05D2201/00—Polymeric substrate or laminate
  • B05D2201/02—Polymeric substrate
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
  • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
  • B05D2501/00—Varnish or unspecified clear coat
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
  • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
  • B05D2502/00—Acrylic polymers

Definitions

• Laminated card comprising a thermochromic pattern and method of manufacturing such a card
• the present invention relates to a laminated card and a method of manufacturing such a card.
• the invention particularly aims at a card adapted to contain information.
• a card may be a means of identification, for example an identity card, or a means of payment, such as a payment card.
• thermochromic ink composition comprising leuco-dye
• thermochromic ink presents a first color when its temperature is within a given temperature range, and becomes transparent when its temperature is outside said given temperature range.
• thermochromic ink a pattern that we wish to make visible or invisible depending on the temperature and in particular visible when the card has a temperature in the given temperature range.
• This pattern can for example be a security code, such as a cryptogram or CW code (card validation code) of a payment card.
• the pattern becomes visible by changing color as soon as its temperature is outside the temperature range. For this, the pattern is heated, for example.
• thermochromic inks containing leuco-dye have the disadvantage of having a slow activation time, i.e. the time required to change from their unique color to transparency.
• this type of thermochromic inks only allows a single color change in opacity.
• the present invention aims to provide a laminated card and a method of manufacturing said card comprising at least one thermochromic pattern having a rapid activation time.
• a laminated card comprising in order:
• thermoplastic support layer - a thermoplastic support layer
• thermochromic ink comprising a liquid crystal compound
• thermochromic ink does not include leukodye.
• thermochromic pattern can completely cover the surface of the card. Alternatively, the thermochromic pattern can cover a continuous or discontinuous part of the surface of the card.
• the thermochromic pattern may be a drawing, one or more characters, a colored area, etc.
• the area of the board corresponds to the area of the support layer.
• the stacking and choice of the different layers allows good adhesion between the layers, in particular improved mechanical resistance of the thermochromic pattern on the thermoplastic support layer, in particular resistance to tearing or degradation of the protective layer.
• adhesion interfaces are in fact formed for this.
• a first adhesion interface is formed by the adhesive layer and the support layer.
• Conventional adhesives water-based or UV-based offering effective adhesion can be used.
• a second adhesion interface is formed between the adhesive layer and the thermochromic pattern, thanks to the adhesion layer.
• the adhesion layer is adapted to the thermochromic ink to allow good adhesion of the thermochromic pattern.
• the invention provides for using an adhesive layer and a bonding layer of the same type (of the same base) in order to guarantee compatibility between the layers as well as high adhesion between the two layers, and therefore between the thermochromic pattern and the support layer.
• the peel force between the different layers of the card is preferably at least 3.5 N. This peel force can be measured by tests and following known standards, in particular the ISO 10373-1, ISO24-78962, or ISO 3225-19 standards.
• the different layers and in particular the adhesive layer and the adhesion layer are chosen so as not to damage the liquid crystals and thus preserve the thermochromic pattern.
• the liquid crystals are chiral nematic liquid crystals.
• the liquid crystals are contained in microcapsules, said microcapsules having a diameter less than 50 microns, preferably between 5 and 15 microns.
• thermochromic pattern can therefore dry quickly.
• Liquid crystal microcapsules consist of approximately 80% of an oleic liquid crystal mixture inside the microcapsules and approximately 20% of dry microcapsule wall material.
• the adhesion layer and the thermochromic ink comprise the same compound. This presence of common compound ensures that the adhesion layer is adapted to the thermochromic ink.
• the compound is notably other than water, acrylic resin and liquid crystal micro-capsules, which traditionally form thermochromic ink.
• the invention proposes a method of manufacturing a laminated card comprising the following steps:
• thermochromic ink comprising a liquid crystal compound
• thermochromic pattern Place a plastic protective layer on the dried thermochromic pattern
• the method comprises, after the step consisting of providing the support layer and before the step consisting of depositing the adhesive layer, a step consisting of printing a non-thermochromic pattern on the support layer by means of an aqueous-based or ultraviolet-cured ink.
• the step consisting of rolling comprises the substeps:
• - cold roll at a temperature between 10°C and 20°C, preferably at 15°C, and a pressure between 50 N/cm 2 and 300 N/cm 2 , preferably 100 N/cm 2 .
• thermochromic ink before lamination it is thus possible to choose and adapt the thermochromic ink before lamination according to the desired Ti activation temperature after lamination.
• the inventors have in fact noted that the difference 8 between the activation temperature To before lamination and the temperature Ti after lamination is due to the high pressure and temperature to which the thermochromic pattern is subjected during the lamination step.
• FIG. 1 is a schematic representation of the front of a laminated card
• FIG. 2 is a schematic representation of the back of the laminated card of Figure 1;
• FIG. 3 is a schematic view, in section, of a laminated card according to one embodiment of the invention.
• FIG. 4 is a schematic view, in section, of a laminated card according to another embodiment of the invention.
• the adhesive layer 101 and the bonding layer 102 are for example an acrylic matrix.
• the manufacturing method comprises a step consisting of providing the third support layer 100.
• the third support layer 100 can for example be arranged between the first support layer 100 and the second support layer 100 after stacking the layers of the front 10 and before stacking the layers of the back 11.
• All the steps of printing, layer assembly and lamination are for example carried out for large layers or sheets which are cut after lamination into several cards in the desired format, in this case in the ID-1 type format. We thus obtain several cards 1.
• the manufacturing process includes a final step consisting of installing the chip.
• the installation of the chip is carried out separately for each card.
• a cavity is formed in the card, for example by means of a milling cutter.
• the cavity is formed over a few microns only.
• the cavity is formed until it reaches in particular the antenna of the third support layer 100.
• the chip is then placed and glued in the cavity. The contact of the chip with the antenna creates the contact.
• the sequence of stages of manufacturing the payment card and the parameters at each stage were chosen to obtain a card comprising at least one thermochromic pattern 103 and having good resistance. Thanks to these choices, the liquid crystals are not damaged despite the various manufacturing constraints (use of various adhesives which could penetrate the microcapsules, lamination under pressure and at high temperature which could break the liquid crystals) and the payment card has the required strength properties.
• the payment card 1 obtained can be used in the following way.
• the thermochromic pattern 103 may be an inscription of security data, for example a security element such as a figure, a symbol, a sequence of characters or a cryptogram.
• the thermochromic pattern 103 is transparent and not visible when its temperature is outside the predefined temperature range. When the thermochromic pattern 103 is heated or cooled so that its temperature is within the predefined temperature range and in particular reaches the activation temperature, the thermochromic pattern 103 changes color and the safety data becomes visible.
• the security data for example the cryptogram
• safety data is invisible to the naked eye when the temperature is below the activation temperature.
• a malicious person observing the payment card could not fraudulently obtain the security data as long as the activation temperature is not reached.
• the security data in the form of a thermochromic pattern constitutes personal data, also called variable data because it is specific to each card holder, such as a payment card verification cryptogram, when the user wishes to know the security data, it simply heats (for example friction) the thermochromic pattern 103 in order to reach the activation temperature.
• thermochromic pattern considerably limits slavish copying and/or the security data is not permanently visible .
• thermochromic ink Since thermochromic ink is reversible, the process of appearing or hiding security data can be repeated infinitely, throughout the life of the payment card, depending on the needs of its use by its holder.
• thermochromic pattern 103 can be used to mask security data, whether variable or not, while still allowing large series application of the process. according to the invention.
• security data such as a cryptogram
• the thermochromic pattern 103 can constitute an area under the security data to be printed for personalization.
• the support and the security data are preferably of the same color so that the security data are not visible outside the predefined temperature range of the thermochromic pattern 103.
• the choice of the black color makes it possible in particular to improve contrast when the thermochromic ink is within the preset temperature range.
• thermochromic pattern 103 The security data is then printed superimposed on the thermochromic pattern 103 so as to make the security data non-visible, outside the predefined temperature range, which is then printed in the same color as the support, the inactive thermochromic pattern 103 being transparent , and so as to reveal the printed security data when the temperature makes the thermochromic pattern 103 active by making it change color.
• the thermochromic pattern 103 is transparent when its temperature is outside the predefined temperature range and “undermasks” the safety data.
• the thermochromic pattern 103 is colored and reveals the safety data when its temperature is within the predefined temperature range.
• thermochromic pattern 103 is cooled so that its temperature is lower than the activation temperature or heated so that its temperature is higher than the deactivation temperature.
• this embodiment particularly finds an interesting application for identity cards.

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• Engineering & Computer Science (AREA)
• Chemical & Material Sciences (AREA)
• Manufacturing & Machinery (AREA)
• Materials Engineering (AREA)
• Organic Chemistry (AREA)
• Life Sciences & Earth Sciences (AREA)
• Wood Science & Technology (AREA)
• Health & Medical Sciences (AREA)
• General Chemical & Material Sciences (AREA)
• General Health & Medical Sciences (AREA)
• Toxicology (AREA)
• Chemical Kinetics & Catalysis (AREA)
• Crystallography & Structural Chemistry (AREA)
• Credit Cards Or The Like (AREA)

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• 2022
  • 2022-09-02 EP EP22797811.1A patent/EP4580888A1/de active Pending
  • 2022-09-02 JP JP2024573581A patent/JP2025529618A/ja active Pending
  • 2022-09-02 US US18/873,133 patent/US20250353037A1/en active Pending
  • 2022-09-02 WO PCT/FR2022/051660 patent/WO2024047285A1/fr not_active Ceased

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