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EP3523136B1 - Verfahren zur herstellung eines sicherheitselements - Google Patents

Verfahren zur herstellung eines sicherheitselements Download PDF

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Publication number
EP3523136B1
EP3523136B1 EP17777933.7A EP17777933A EP3523136B1 EP 3523136 B1 EP3523136 B1 EP 3523136B1 EP 17777933 A EP17777933 A EP 17777933A EP 3523136 B1 EP3523136 B1 EP 3523136B1
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EP
European Patent Office
Prior art keywords
support
liquid crystals
adhesion primer
layer
security element
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.)
Active
Application number
EP17777933.7A
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English (en)
French (fr)
Other versions
EP3523136A1 (de
Inventor
Pierre Sarrazin
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Oberthur Fiduciaire SAS
Original Assignee
Oberthur Fiduciaire SAS
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
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
    • B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
    • B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
    • B42D25/20—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
    • 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
    • B41M3/144—Security printing using fluorescent, luminescent or iridescent effects
    • 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
    • B42D25/40—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

Definitions

  • the present invention relates to security elements for secure documents, and their manufacturing methods.
  • the invention relates more particularly to security elements carrying liquid crystals.
  • Liquid crystals especially cholesteric
  • security elements for their goniochromatic properties.
  • they are generally placed in front of a dark background, in particular black.
  • tape security elements also called security threads
  • security threads are very often incorporated into secure documents such as banknotes.
  • These security elements conventionally comprise a substrate made of a thermoplastic material, for example PET, which can be metallized and provided with demetallized zones in the form of patterns appearing in transmitted light.
  • a substrate made of a thermoplastic material, for example PET, which can be metallized and provided with demetallized zones in the form of patterns appearing in transmitted light.
  • the transfer process generates a loss of material and lamination steps, which make manufacturing more complex.
  • EP 1 744 904 discloses a substrate made of a biaxially oriented PET film coated with oriented liquid crystals. This type of structure does not offer complete satisfaction in terms of adhesion to the substrate.
  • JP 2009-98568 discloses a security element comprising an oriented film, of plastic material, capable of undergoing biaxial stretching and capable of carrying liquid crystals.
  • GB 2 527 763 discloses a sheet having an oriented polymeric film and capable of containing liquid crystals as well as an adhesive layer.
  • WO 2008/116796 relates to a security document comprising a plurality of polymeric films including a non-transparent film undergoing axial stretching. Adhesive layers can be applied to this film by printing. Furthermore, this film may include liquid crystals.
  • the invention aims to meet this need, and it achieves it by means of a method of manufacturing a security element comprising an oriented plastic support and at least one layer of liquid crystals carried and oriented by the support, a primer adhesion being deposited before or after the stretching of the support at least in one direction, said stretching making it possible to bring the support to the oriented state and the liquid crystals being deposited by printing on this adhesion primer.
  • adhesion primer should be understood to mean any layer promoting adhesion. Thus this expression should not be understood in a limiting manner.
  • the adhesion of liquid crystals is improved and the deposition of liquid crystals by printing offers multiple possibilities in terms of aesthetics and optical effects obtained.
  • liquid crystals can be carried out in any pattern, on well-defined areas, offering great flexibility in the arrangement. different means of securing within the element. It is possible to obtain a greater diversity of color change effects, without penalizing the transparency of the openings of a Cleartext, if necessary.
  • the invention makes it possible to avoid deposition of liquid crystals by transfer, which facilitates the implementation of the method.
  • the adhesion primer is deposited before a step of stretching the support.
  • the support is oriented in one direction, then the primer is deposited, and the support is then stretched in another direction.
  • the support preferably comprises PET, but other materials can be used.
  • the primer may require crosslinking before application of the liquid crystals, in particular when it comprises monomers.
  • the method can thus comprise a step of crosslinking the adhesion primer, preferably after stretching of the support.
  • the adhesion primer may comprise a polyolefin (or polyalkene), preferably polyethylene, polyurethane, polyester, polyether, polycarbonate, polyacrylic or one of their copolymers, and preferably comprise a polyacrylic.
  • a polyolefin or polyalkene
  • polyethylene preferably polyethylene, polyurethane, polyester, polyether, polycarbonate, polyacrylic or one of their copolymers, and preferably comprise a polyacrylic.
  • the adhesion primer may comprise, in particular before its deposition, at least one olefin (or alkene), urethane, ester, ether, carbonate or acrylic, preferably acrylic, monomer.
  • the application of the primer can be carried out by any means, and in particular by printing, coating, spraying or co-extrusion.
  • the printing of the liquid crystals can be carried out by any means and preferably by screen printing, gravure printing or flexography.
  • the liquid crystals are deposited after stretching of the support.
  • the method may include printing on the adhesion primer two different inks, at least one of which comprises liquid crystals, better still both of which include liquid crystals, the liquid crystals preferably being cholesteric.
  • the reflective haze effect (“Reflection Haze” hereinafter “Haze”) of the cholesteric liquid crystal layer may be lower than that of a reference security element without the adhesion primer layer.
  • Diffusion haze in reflection causes a milky appearance, related to low intensity light scattering next to the main reflection, which corresponds to the reflection in the specular direction.
  • the measurement can be performed according to ASTM D4039-09 (reapproved 2015) or ISO 13803: 2014. This allows visibility over a wider angular range of the goniochromatic effect and therefore masking of the background over a wider angular range.
  • a dark background can be provided under the liquid crystal layer, in particular on the opposite side of the support.
  • the dark background can be provided on the liquid crystal layer, in particular on the same side of the support.
  • This dark background can be obtained by printing a dye, or a pigment (absorbent or interference).
  • the dark background is obtained by metallization, in particular under vacuum or electrochemically or by any other technique for depositing a metal, a metal oxide or a metal oxide salt.
  • the dark background can also be carried by an additional support, preferably comprising PET, fixed to the support by any suitable means, in particular by lamination using an adhesive. Where appropriate, the additional support is preferably attached to the support on the side of the liquid crystal layer.
  • the dark background is at least partially superimposed on the liquid crystal layer.
  • the dark background is preferably arranged in a marked manner relative to the printing of the liquid crystals; in particular, the dark background can be exactly superimposed on the liquid crystals.
  • the dark background can be achieved before or after the application of the liquid crystals.
  • the dark background may have a transmission rate of less than 80%, and is preferably opaque.
  • the adhesion primer is preferably transparent.
  • the security element may include printing of at least two liquid crystal inks, preferably without superimposition between them.
  • the adhesion of the liquid crystal layer on the support measured according to the Tesa test described below is preferably equal to 2.
  • the liquid crystal layer is in the form of patterns, in particular alphanumeric.
  • the subject of the invention is also a method for authenticating a security element according to the invention, comprising the observation of the element so as to determine whether a goniochromatic effect is observed for incidences greater than or equal to 70 °. , and the step of generating information regarding the authenticity based at least on this observation.
  • the authentication method may include observing the element through a polarizing filter in order to demonstrate the orientation of the support and the adhesion primer and the step of generating information relating to the. authenticity on the basis of at least this observation.
  • a security element 10 comprising a support 11, a bonding primer 12 and a liquid crystal layer 13 deposited by printing on the primer 12.
  • Layer 13 is formed by two prints 13a, 13b without superimposition between them, of different colors.
  • the impressions 13a and 13b together do not cover the entire surface area of the face 11a of the support.
  • the prints 13a and 13b together cover the entire face 11a of the support.
  • the prints are advantageously carried out superimposed on an opaque background, preferably dark or reflecting, for example black.
  • the opaque layer 15 is for example an impression of a black ink or a metallization.
  • Layer 15 is produced, for example, after depositing layer 13 of liquid crystals.
  • the opaque layer 15 is present on the liquid crystal layer 13 on the same side of the support. The observation of the security element is then made from the side of the support opposite to the layer 13 of liquid crystals.
  • the support is made of a stretchable thermoplastic material.
  • the support is made of PET, polypropylene or polyethylene.
  • an additional support preferably comprising PET, is attached to the support by any suitable means, in particular by lamination using an adhesive.
  • the additional support is preferably attached to the support on the side of the liquid crystal layer.
  • the liquid crystal layer is preferably in the form of patterns, and for example covers less than 50% of the surface of the support. The adhesion between the support and the additional support is thus reinforced.
  • the liquid crystals are cholesteric liquid crystals (CLC).
  • the liquid crystals are nematic liquid crystals.
  • the ink can be a mixture of cholesteric and nematic liquid crystals, in a ratio chosen as a function of the desired color variation.
  • the adhesion primer increases the adhesion of the liquid crystals to the support without thereby preventing the support from participating by its intrinsic structure in the orientation of the liquid crystals.
  • the adhesion primer comprises one or more polymers.
  • the primer can be applied in the form of monomers, in particular olefin (or alkene), urethane, ester, ether, carbonate or acrylic, preferably acrylic, on the support and this application is then followed by crosslinking, for example by exposure to UV radiation
  • the chemical nature of the primer is chosen so as to have the best affinity with the liquid crystal ink used.
  • the liquid crystal inks being based on acrylate monomers, it is preferred to use a primer based on acrylate monomers as well.
  • the quantity of primer which is deposited is chosen so that the thickness of the deposit remains sufficiently low for the structure of the underlying support to remain active with respect to the orientation of the liquid crystals.
  • the thickness of the primer is thus preferably less than 1000 nm, better still less than 100 nm.
  • the security element may include, in addition to the liquid crystals, any other security means chosen from those of first, second or third levels.
  • the security element according to the invention is advantageously a security thread, a foil, a patch or a variable data protection film. It may also be a card or a protective or tamper-evident film.
  • a security element consisting of a security thread
  • the latter can be integrated into windows in a security paper such as a bank note 30, as illustrated in figure 8 .
  • the security element then extends from one edge 31 to the other 32 of the document.
  • the security element When the security element is in the form of a wire, its width is for example between 1 and 10 mm and its thickness between 10 and 100 ⁇ m.
  • the security element is applied by transfer to the surface of a paper, film or card, for example.
  • the term “patch” denotes a film which does not cover the entire surface of the underlying substrate.
  • the method comprises, as illustrated in figure 7 , a step 21 of making a plastic film, for example by extrusion.
  • This film can be monolayer or multilayer.
  • the adhesion primer is applied in a step 23, then the film is stretched again, in a direction different from the first, for example in the transverse direction (also called the transverse direction), in a step 24.
  • liquid crystals are deposited by printing in step 25, on the film thus bi-stretched and coated with the adhesion primer.
  • the orientation of the liquid crystals takes place during the evaporation of the solvent present in the ink used.
  • This evaporation is preferably carried out by “airborne” drying (Air Flow in English), preferably horizontally to promote the orientation of the liquid crystals.
  • the ink is crosslinkable under UV, and the crosslinking which follows the deposition of the ink makes it possible to definitively fix this orientation.
  • Printing is preferably carried out with several liquid crystal inks, which are preferably deposited without overlap between them.
  • the inks can be deposited in the form of solids or patterns.
  • pattern denotes any pattern recognizable to the naked eye in particular, such as for example one or more alphanumeric characters, or the image of a subject such as a character, animal, object, landscape, plant or monument. . It may be a halftone raster pattern, preferably appearing in 3D due to a shading effect obtained by halftone reproduction of the pattern. It may be a repeating pattern arranged in a given direction, in a frame or preferably in a checkerboard arrangement.
  • Printing can be done by flexography, screen printing or gravure printing, among other printing techniques that can be used.
  • the film undergoes a double stretching in the running and transverse directions after application of the adhesion primer. This removal preferably takes place after a first stretching in the running direction.
  • the authentication of a security element according to the invention can be carried out by observing the element so as to determine whether a goniochromatic effect is observed for incidences greater than or equal to 70 °, this effect being linked to the presence of liquid crystals.
  • Authentication may include observing the element through a polarizing filter with a view to demonstrating the orientation of the support and the adhesion primer and the step of generating information relating to the authenticity on at least the basis of this observation.
  • the bi-orientation of the support can be verified by analyzing the birefringence of the film, in a conventional manner.
  • a linear polarizer such as a filter to put on the security element, which is rotated 90 ° to determine if you change from a dark appearance to a lighter appearance when rotating.
  • the “Tesa” test mentioned below is an adhesion test of a layer deposited on a substrate, in which an adhesive tape is applied to the layer of which it is sought to measure the cohesion and the adhesion to the substrate.
  • the mixture constitutes an ink with an acrylic base, comprising cholesteric and nematic liquid crystals.
  • the ratio chosen between cholesteric and nematic liquid crystals gives the color; here we get a change from blue to green-yellow with the angle of observation.
  • the liquid crystals are deposited to a thickness of 3 microns, on the coating bar.
  • Hot air blown drying is performed to align the liquid crystals.
  • the ink is subjected to UV crosslinking.
  • the plasma treatment does not provide optimal adhesion, but the alignment of the liquid crystals is correct.
  • the chemically etched PET film provides excellent adhesion, but the optical effect is degraded.
  • the liquid crystal deposition is carried out as in Examples 1 to 3 by means of a commercially available liquid crystal ink.
  • Offline the application occurs after the PET film stretching steps.
  • In-line the application takes place during the manufacture of the film between at least two stages of stretching of the PET film.
  • the goniochromatic effect is surprisingly preserved for Examples 5 to 7, despite the presence of an intermediate primer layer between the biaxially oriented PET support which allows alignment and the liquid crystal layer.
  • the alignment of the liquid crystals is modified by the presence of the adhesion primer.
  • the modification of this alignment makes it possible to increase the visibility of the color change effect, and to give the liquid crystal layer a translucency which makes it possible to limit the visibility of the black background.
  • the degree of translucency can be determined by measuring the “Haze” in reflection according to ASTM D4039-09 and ISO13803. This is a measure of haze, i.e. milky opalescence, glossy or clear topcoat.
  • the “Haze” of the layer of liquid crystals on a support according to the invention can be lower than that of the layer of liquid crystals on an untreated PET, which results in much less gloss than for the layer of liquid crystals on a support. standard.
  • the reduction of the “Haze” increases the light diffusion of the liquid crystal layer and therefore allows the observation of the goniochromatic effect over a larger range of angles.
  • the goniochromatic effect is maintained with a support according to the invention, whereas with a standard support, the liquid crystals are no longer visible and the dark background is observed, which is not desirable.
  • the “Haze”, measured according to the ISO 13803: 2014 standard, of the films (1) and (6) is respectively 274 and 79. Such a measurement is illustrated on the figure 9 on which the support to be measured 91 is illuminated at an angle ⁇ which is for example 20 ° for the aforementioned standard).
  • the “Haze” is measured by means of the sensors 92 and corresponds to the intensity of the light rays 93, as opposed to the brightness which corresponds to the intensity of the specular ray 94 (angle -a).
  • the intensity of sample 6 is greater than that of sample 1, which reflects the visibility over a wider angular range of the goniochromatic effect of sample 6.

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  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Accounting & Taxation (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Business, Economics & Management (AREA)
  • Finance (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Printing Methods (AREA)
  • Polarising Elements (AREA)
  • Credit Cards Or The Like (AREA)
  • Laminated Bodies (AREA)
  • Liquid Crystal (AREA)

Claims (15)

  1. Verfahren zur Herstellung eines Sicherheitselements, das einen orientierten Träger (11) aus Kunststoff und wenigstens eine Schicht aus Flüssigkristallen (13), die von dem Träger getragen und orientiert werden, aufweist, wobei ein Haftprimer (12) vor oder nach dem Dehnen des Trägers wenigstens in einer Richtung aufgebracht wird, wobei das Dehnen ermöglicht, den Träger in den orientierten Zustand zu versetzen, dadurch gekennzeichnet, dass die Flüssigkristalle durch Drucken auf diesen Haftprimer aufgebracht werden.
  2. Verfahren nach Anspruch 1, wobei der Haftprimer (12) vor einem Schritt des Dehnens des Trägers (11) aufgebracht wird und/oder der Träger PET aufweist.
  3. Verfahren nach einem der Ansprüche 1 und 2, wobei das Verfahren außerdem einen Schritt der Vernetzung des Haftprimers umfasst, vorzugsweise nach dem Dehnen des Trägers.
  4. Verfahren nach einem der Ansprüche 1 bis 3, wobei der Haftprimer ein Polyolefin, ein Polyurethan, Polyester, Polyether, Polycarbonat, Polyacrylat oder eines ihrer Copolymere aufweist, wobei der Haftprimer insbesondere ein Polyacrylat aufweist und vorzugsweise, insbesondere vor seiner Aufbringung, wenigstens ein Urethan-, Ester-, Ether-, Carbonat- oder Acrylmonomer aufweist.
  5. Verfahren nach einem der vorhergehenden Ansprüche, wobei das Drucken der Flüssigkristalle durch Siebdruck, Tiefdruck oder Flexodruck erfolgt.
  6. Verfahren nach einem der vorhergehenden Ansprüche, wobei die Flüssigkristalle nach dem Dehnen des Trägers aufgebracht werden.
  7. Verfahren nach einem der vorhergehenden Ansprüche, welches das Drucken von zwei verschiedenen Druckfarben auf den Haftprimer umfasst, von denen wenigstens eine cholesterische Flüssigkristalle aufweist und die besser beide cholesterische Flüssigkristalle aufweisen.
  8. Verfahren nach einem der vorhergehenden Ansprüche, wobei die Diffusionsnebel-Wirkung der Schicht aus cholesterischen Flüssigkristallen geringer als diejenige eines Referenz-Sicherheitselements ohne die Haftprimerschicht ist.
  9. Verfahren nach einem der vorhergehenden Ansprüche, welches einen dunklen Untergrund unter der Schicht aus Flüssigkristallen aufweist.
  10. Verfahren nach einem der vorhergehenden Ansprüche, wobei der Haftprimer transparent ist.
  11. Sicherheitselement (10) für ein gesichertes Dokument, das insbesondere mithilfe eines Verfahrens nach einem der vorhergehenden Ansprüche erhalten worden ist und aufweist:
    a. einen Träger (11) aus gedehntem thermoplastischem Material,
    b. einen Haftprimer (12) zum Haften an der Oberfläche des Trägers,
    und gekennzeichnet ist durch
    c. wenigstens eine Schicht (13) aus Flüssigkristallen, die durch Drucken auf den Haftprimer aufgebracht ist.
  12. Sicherheitselement nach Anspruch 11, welches einen Druck von wenigstens zwei Flüssigkristallfarben aufweist, vorzugsweise ohne Überlagerung zwischen ihnen.
  13. Sicherheitselement nach Anspruch 11 oder 12, wobei die Haftung der Schicht aus Flüssigkristallen, gemessen gemäß dem Tesa-Test, gleich 2 ist, und/oder wobei die Schicht aus cholesterischen Flüssigkristallen in der Form eines, insbesondere alphanumerischen, Musters vorliegt.
  14. Sicherheitselement nach einem der Ansprüche 11 bis 13, welches außerdem einen dunklen Untergrund aufweist.
  15. Verfahren zur Authentifizierung eines Sicherheitselements nach einem der Ansprüche 11 bis 14, welches die Betrachtung des Elements, um so zu bestimmen, ob für Einfallswinkel größer oder gleich 70° ein goniochromatischer Effekt zu beobachten ist, und den Schritt, der darin besteht, auf der Basis wenigstens dieser Beobachtung eine Information betreffs der Authentizität zu erzeugen, umfasst, oder welches die Betrachtung des Elements durch ein polarisierendes Filter hindurch, um die Orientierung des Trägers und des Haftprimers zum Vorschein zu bringen, und den Schritt, der darin besteht, auf der Basis wenigstens dieser Beobachtung eine Information betreffs der Authentizität zu erzeugen, umfasst.
EP17777933.7A 2016-10-10 2017-10-09 Verfahren zur herstellung eines sicherheitselements Active EP3523136B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR1659743A FR3057205B1 (fr) 2016-10-10 2016-10-10 Procede de fabrication d'un element de securite
PCT/EP2017/075621 WO2018069216A1 (fr) 2016-10-10 2017-10-09 Procede de fabrication d'un element de securite

Publications (2)

Publication Number Publication Date
EP3523136A1 EP3523136A1 (de) 2019-08-14
EP3523136B1 true EP3523136B1 (de) 2020-09-30

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EP17777933.7A Active EP3523136B1 (de) 2016-10-10 2017-10-09 Verfahren zur herstellung eines sicherheitselements

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Country Link
EP (1) EP3523136B1 (de)
KR (1) KR20190067173A (de)
CN (1) CN109843597B (de)
FR (1) FR3057205B1 (de)
RU (1) RU2741481C2 (de)
WO (1) WO2018069216A1 (de)

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WO2020153349A1 (ja) * 2019-01-21 2020-07-30 富士フイルム株式会社 偽造防止媒体および情報カード

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DE102013113283A1 (de) * 2013-11-29 2015-06-03 Leonhard Kurz Stiftung & Co. Kg Mehrschichtkörper und Verfahren zu dessen Herstellung
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RU2019107329A3 (de) 2020-12-09
FR3057205B1 (fr) 2020-10-16
WO2018069216A1 (fr) 2018-04-19
RU2741481C2 (ru) 2021-01-26
KR20190067173A (ko) 2019-06-14
CN109843597B (zh) 2021-02-09
FR3057205A1 (fr) 2018-04-13
EP3523136A1 (de) 2019-08-14
RU2019107329A (ru) 2020-11-13
CN109843597A (zh) 2019-06-04

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