WO2021241226A1 - 真贋判定部材及びその真正性判定方法 - Google Patents
真贋判定部材及びその真正性判定方法 Download PDFInfo
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- WO2021241226A1 WO2021241226A1 PCT/JP2021/018013 JP2021018013W WO2021241226A1 WO 2021241226 A1 WO2021241226 A1 WO 2021241226A1 JP 2021018013 W JP2021018013 W JP 2021018013W WO 2021241226 A1 WO2021241226 A1 WO 2021241226A1
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- Prior art keywords
- layer
- authenticity determination
- polarized light
- main surface
- determination member
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Classifications
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/30—Polarising elements
- G02B5/3016—Polarising elements involving passive liquid crystal elements
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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
- B42D25/30—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
- B42D25/373—Metallic materials
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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
- B42D25/30—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
- B42D25/391—Special inks absorbing or reflecting polarised light
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- 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
- G07D7/06—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 wave or particle radiation
- G07D7/12—Visible light, infrared or ultraviolet radiation
-
- 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
- G07D7/06—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 wave or particle radiation
- G07D7/12—Visible light, infrared or ultraviolet radiation
- G07D7/1205—Testing spectral properties
-
- 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
- G07D7/20—Testing patterns thereon
- G07D7/202—Testing patterns thereon using pattern matching
Definitions
- the present invention relates to an authenticity determination member and a method for determining authenticity thereof.
- Patent Document 1 describes a cholesteric liquid crystal material having a property of reflecting circularly polarized light that rotates in the opposite direction to the other circularly polarized light that can pass through the base material on the front side of the base material that has a function of transmitting one of the left and right circularly polarized light.
- a medium obtained by forming a printed image with a material having no such property is disclosed.
- the print layer is formed of a material containing a metal pigment as a material that does not have the property of reflecting circularly polarized light that rotates in the opposite direction to the circularly polarized light that can pass through the substrate.
- the degree of freedom of expression may be reduced.
- the metallic color reflected image by the printed layer is not observed and it is simply black. This is because it is observed as an image.
- freedom of expression is reduced, it may be difficult to determine the authenticity of the medium.
- an authenticity determination member that includes a print layer containing a metal pigment and can obtain different reflection images depending on whether the image is observed from the front side or the back side; and the authenticity determination method of the authenticity determination member. ,It has been demanded.
- the present inventor has made the base material layer of the authenticity determination member a reflective circular polarizing element, and contains a resin pigment which is a fragment of a resin layer having cholesteric regularity.
- the present invention has been completed by finding that the above-mentioned problems can be solved by providing the printing layer of No. 1 and the second printing layer containing a metal pigment on the base material layer. That is, the present invention provides the following.
- a base material layer that is a reflective circular polarizing element A first printing layer containing a resin pigment which is a fragment of the resin layer A1 having cholesteric regularity and provided on the base material layer, and An authenticity determination member containing a metal pigment having no circularly polarized light separation function and including a second printing layer provided on the base material layer.
- the authenticity determination member according to [1] which is different from the reflected image (2).
- the resin layer A1 has a reflectance of 40% or more at at least one wavelength in the visible wavelength band, and a half-value width of the reflection band having a reflectance of 35% or more and 50% or less is 350 nm or more. , [1] or [2]. [4] Of [1] to [3], the base material layer is a resin layer A2 having a cholesteric regularity, and the resin layer A1 and the resin layer A2 have the same cholesteric regularity in a twisting direction.
- the authenticity determination member according to any one of the items.
- the resin layer A2 has a reflectance of 40% or more at at least one wavelength in the visible wavelength band, and a half-value width of the reflection band having a reflectance of 35% or more and 50% or less is 350 nm or more. , [4].
- the base material layer is a reflective linear polarizing element, a first ⁇ / 4 plate provided on one main surface of the reflective linear polarizing element, and the other of the reflective linear polarizing elements.
- the step (2) of obtaining a reflected image (2) by injecting non-polarized light from the other main surface side of the authenticity determining member and observing the member, and the reflected image (1) and the reflected image (2) are different.
- a method for determining the authenticity of an authenticity determining member which comprises a step (3) for determining that.
- an authenticity determination member that includes a print layer containing a metal pigment and can obtain different reflection images depending on whether the image is observed from the front side or the back side; and the authenticity of the authenticity determination member. Gender determination method; can be provided.
- FIG. 1 is a schematic plan view of an authenticity determination member according to an embodiment of the present invention as viewed from the thickness direction.
- FIG. 2 is a diagram schematically showing a cut surface of FIG. 1 taken by line II-II.
- FIG. 3 is an explanatory diagram when the authenticity determining member according to the embodiment of the present invention is observed from one main surface side.
- FIG. 4 is an explanatory diagram when the authenticity determining member according to the embodiment of the present invention is observed from the other main surface side.
- FIG. 5 is a schematic view showing an image when the authenticity determination member according to the embodiment of the present invention is irradiated with non-polarized light and observed.
- FIG. 6 is a schematic view showing an image when the authenticity determination member according to the embodiment of the present invention in FIG.
- FIG. 7 is a schematic plan view of the authenticity determination member according to the comparative example as viewed from the thickness direction.
- FIG. 8 is a diagram schematically showing a cut surface by the line VIII-VIII of FIG. 7.
- FIG. 9 is an explanatory diagram when the authenticity determination member according to the comparative example is observed from one main surface side.
- FIG. 10 is an explanatory diagram when the authenticity determination member according to the comparative example is observed from the other main surface side.
- the slow axis of the film or layer represents the slow axis in the plane of the film or layer unless otherwise specified.
- (meth) acryloyl includes “acryloyl”, “methacryloyl” and combinations thereof.
- circularly polarized light also includes elliptically polarized light.
- the visible wavelength band means the wavelength range of visible light, and means the range of wavelengths of 380 nm or more and 830 nm or less.
- the " ⁇ / 4 plate” includes not only rigid members but also flexible members such as resin films, unless otherwise specified.
- the authenticity determination member includes a base material layer, a first printing layer provided on the base material layer, and a second printing layer provided on the base material layer.
- the base material layer is a reflective circular polarizing element.
- the first printing layer contains a resin pigment which is a fragment of the resin layer A1 having cholesteric regularity.
- the second printed layer contains a metal pigment having no circularly polarized light separation function.
- the base material layer is a reflective circular polarizing element.
- the reflective circularly polarized light is a circularly polarized light having a clockwise rotation direction and a circularly polarized light having a counterclockwise rotation direction, which reflects the circularly polarized light having one rotation direction and having the other rotation direction. It means a polarizing element having a function of transmitting the light. Such a function is also referred to as a circularly polarized light separation function.
- the reflective circular polarizing element may be a multilayer body including a base film or the like.
- Examples of such a reflective circular polarizing element include (1) a resin layer having cholesteric regularity, (2) a reflective linear polarizing element, and a first one provided on one main surface of the reflective linear polarizing element.
- a multi-layer body provided with a plate) can be mentioned.
- the base material layer a layer containing a resin layer having cholesteric regularity is preferable, and a resin layer having cholesteric regularity is more preferable.
- cholesteric regularity means that the molecular axes are aligned in a certain direction on one plane, but the direction of the molecular axes deviates at a slight angle in the next plane that overlaps with it, and further angles in the next plane. It is a structure in which the angle of the molecular axis in the plane shifts (twists) as it sequentially passes through the planes that are arranged in an overlapping manner. That is, when the molecules in the layer have cholesteric regularity, the molecules are aligned in the resin layer in such a manner as forming a layer of a large number of molecules.
- the molecules are aligned so that the axis of the molecule is in a certain direction, and in the adjacent layer B, the molecules are displaced at an angle with the direction in the layer A.
- the molecules are aligned in the direction, and in the layer C adjacent to the molecule, the molecules are aligned in a direction further deviated from the direction in the layer B at an angle.
- the angles of the axes of the molecules are continuously deviated, and a structure in which the molecules are twisted is formed.
- the structure in which the direction of the molecular axis is twisted in this way becomes an optically chiral structure.
- the resin layer having a cholesteric regularity that can form the base material layer is also referred to as a cholesteric resin layer or a resin layer A2.
- the reflection in the cholesteric resin layer reflects the circularly polarized light while maintaining its chirality.
- the cholesteric resin layer preferably has a reflectance of 40% or more at at least one wavelength in the visible wavelength band. As a result, the reflected image observed by incident non-polarized light on the authenticity determination member becomes clear, and it becomes easy to determine the authenticity of the authenticity determination member.
- the reflectance of the cholesteric resin layer is usually 50% or less.
- the cholesteric resin layer preferably has a half-value width of a reflection band having a reflectance of 35% or more and 50% or less of 350 nm or more. Since the cholesteric resin layer exerts the circularly polarized light separation function in a wide wavelength range, the authenticity of the authenticity determination member can be determined in a wide wavelength range.
- the reflected light of the cholesteric resin layer can be made into a color close to metallic white (silver), and the degree of freedom in design can be increased.
- the upper limit of the half width is not particularly limited and may be the width over the entire visible light band. For example, it may be 500 nm or less, or 400 nm or less.
- the wavelength at which the circularly polarized light separation function is exhibited generally depends on the pitch of the spiral structure in the cholesteric resin layer.
- the pitch of the spiral structure is the distance in the plane normal direction until the direction of the molecular axis in the spiral structure gradually shifts continuously as the direction of the molecular axis advances in the plane, and then returns to the original molecular axis direction again. ..
- By changing the size of the pitch of this spiral structure it is possible to change the wavelength at which the circularly polarized light separation function is exhibited.
- Examples of the cholesteric resin layer capable of exhibiting the circularly polarized light separation function in a wide wavelength range are (i) the size of the pitch of the spiral structure.
- Examples thereof include a cholesteric resin layer in which the above-mentioned is gradually changed, and (ii) a cholesteric resin layer in which the pitch size of the spiral structure is continuously changed.
- the cholesteric resin layer can be obtained, for example, by providing a film of the cholesteric liquid crystal composition on an appropriate support for forming the resin layer and curing the film of the cholesteric liquid crystal composition.
- the obtained layer can be used as it is as a cholesteric resin layer.
- the cholesteric liquid crystal composition for forming the cholesteric resin layer for example, a composition containing a liquid crystal compound and capable of exhibiting a cholesteric liquid crystal phase when a film is formed on the support can be used.
- the liquid crystal compound a liquid crystal compound which is a polymer compound and a polymerizable liquid crystal compound can be used.
- the cholesteric liquid crystal composition may contain one liquid crystal compound alone, or may contain any combination of two or more liquid crystals.
- a polymerizable liquid crystal compound In order to obtain high thermal stability, it is preferable to use a polymerizable liquid crystal compound.
- a polymerizable liquid crystal compound By polymerizing such a polymerizable liquid crystal compound in a state of exhibiting cholesteric regularity, the film of the cholesteric liquid crystal composition can be cured to obtain a cured non-liquid crystal resin layer while exhibiting cholesteric regularity. can.
- Examples of the polymerizable liquid crystal compound include a rod-shaped liquid crystal compound represented by the following general formula (1).
- R 1 and R 2 each independently represent a polymerizable functional group.
- polymerizable functional groups include carboxyl group, (meth) acryloyl group, epoxy group, thioepoxy group, mercapto group, isocyanate group, isothiocyanate group, oxetane group, thietanyl group, aziridinyl group, pyrrole group, vinyl group and allyl.
- examples thereof include a group, a fumarate group, a cinnamoyl group, an oxazoline group, a hydroxyl group, an alkoxysilyl group, an amino group and the like.
- D 1 and D 2 are independently saturated hydrocarbons having a single bond, a linear or branched methylene group having 1 to 20 carbon atoms, and an alkylene group. It represents a group selected from the group consisting of a hydrogen group and a linear or branched alkylene oxide group having 1 to 20 carbon atoms.
- C 1 to C 4 are independently single-bonded, -O-, -S-, -S-S-, -CO-, -CS-, -OCO-, and -CH.
- M represents a mesogen group.
- M include azomethines, azoxys, phenyls, biphenyls, terphenyls, naphthalenes, anthracenes, benzoic acid esters, cyclohexanecarboxylics which may have an unsubstituted or substituent.
- Two to four skeletons selected from the group of acid phenyl esters, cyanophenylcyclohexanes, cyano-substituted phenylpyrimidins, alkoxy-substituted phenylpyrimidins, phenyldioxans, trans, alkenylcyclohexylbenzonitriles are -O.
- R 3 and R 4 represent a hydrogen atom or an alkyl group having 1 to 10 carbon atoms.
- R 5 represents a hydrogen atom or an alkyl group having 1 to 6 carbon atoms.
- alkyl group having 1 to 10 carbon atoms which may have a substituent includes a halogen atom, a hydroxyl group, a carboxyl group, a cyano group, an amino group and 1 to 6 carbon atoms.
- rod-shaped liquid crystal compound examples include the following compounds (B1) to (B10). In addition, one of these may be used alone, or two or more of them may be used in combination at any ratio.
- the concentration of the liquid crystal compound in the cholesteric liquid crystal composition is not particularly limited, but is preferably 5% by weight or more, more preferably 10% by weight or more, still more preferably 14% by weight or more, and particularly preferably 15% by weight or more. It is preferably 40% by weight or less, more preferably 35% by weight or less, still more preferably 30% by weight or less.
- the cholesteric liquid crystal composition may contain an orientation aid for assisting the orientation of the liquid crystal compound.
- the orientation aid may be a substance having no liquid crystallinity.
- orientation aid examples include compounds represented by the following general formula (2). R 6- A 1- Z-A 2- R 7 (2)
- R 6 and R 7 are each independently a linear or branched alkyl group having 1 to 20 carbon atoms, a linear group having 1 to 20 carbon atoms, or A branched alkylene oxide group, a hydrogen atom, a halogen atom, a hydroxyl group, a carboxyl group, a (meth) acryloyl group, an epoxy group, a mercapto group, an isocyanate group, an amino group, and an optional bonding group may be present.
- the alkyl group and the alkylene oxide group may not be substituted, and may be substituted with one or more halogen atoms. Further, if two or more substituents are present in each of the alkyl group and the alkylene oxide group, they may be the same or different. Further, the halogen atom, hydroxyl group, carboxyl group, (meth) acryloyl group, epoxy group, mercapto group, isocyanate group, amino group and cyano group are alkyl groups having 1 to 2 carbon atoms and / or alkylene oxides. It may be bonded to a group.
- R 6 and R 7 include a halogen atom, a hydroxyl group, a carboxyl group, a (meth) acryloyl group, an epoxy group, a mercapto group, an isocyanate group, an amino group, and a cyano group.
- At least one of R 6 and R 7 is preferably a polymerizable functional group.
- the compound represented by the general formula (2) is fixed in the liquid crystal layer at the time of curing to form a liquid crystal cured product layer which is a stronger film. can do.
- the polymerizable functional group include those similar to those of a polymerizable liquid crystal compound, and among them, a carboxyl group, a (meth) acryloyl group, an epoxy group, a mercapto group, an isocyanate group, and an amino group are preferable.
- a 1 and A 2 are independently 1,4-phenylene group, 1,4-cyclohexylene group, cyclohexene-1,4-diyl group, 4,4'-biphenylene group, respectively.
- substituents such as a halogen atom, a hydroxyl group, a carboxyl group, a cyano group, an amino group, an alkyl group having 1 to 10 carbon atoms, and an alkyl halide group. May be. Furthermore, if two or more substituents are present in each of A 1 and A 2, they may be the same or different.
- a 1 and A 2 include a 1,4-phenylene group, a 4,4'-biphenylene group, and a 2,6-naphthylene group.
- aromatic ring skeletons are relatively rigid as compared with the alicyclic skeleton, have a high affinity for the mesogen of the polymerizable liquid crystal compound, and have a higher orientation uniformity ability.
- Specific examples of the compound represented by the general formula (2) being particularly preferable include, for example, the following compounds (A1) to (A10).
- compound (A3) "*" represents a chiral center.
- the cholesteric liquid crystal composition may contain a chiral agent, and preferably contains a chiral agent.
- the twisting direction of the cholesteric resin layer can be appropriately selected depending on the type and structure of the chiral agent to be used. This can be achieved by using a chiral agent that imparts right-handedness when the twist is to the right, and by using a chiral agent that imparts left-handedness when the twisting direction is to the left.
- Specific examples of the chiral agent include JP-A-2005-289881, JP-A-2004-115414, JP-A-2003-66214, JP-A-2003-313187, JP-A-2003-342219, and JP-A.
- JP-A-2000-290315 JP-A-6-072962, US Pat. No. 6,468,444, International Publication No. 98/00428, JP-A-2007-176870, etc.
- it can be obtained as LC756 of BASF Palio Color.
- one type of chiral agent may be used alone, or two or more types may be used in combination at any ratio.
- the amount of chiral agent can be arbitrarily set within a range that does not deteriorate the desired optical performance.
- the specific amount of the chiral agent is, for example, 1% by weight to 60% by weight in the cholesteric liquid crystal composition.
- the cholesteric liquid crystal composition may contain a polymerization initiator.
- the polymerization initiator include a photopolymerization initiator.
- the photopolymerization initiator for example, a known compound that generates a radical or an acid by ultraviolet rays or visible light can be used.
- photopolymerization initiator examples include benzoin, benzyldimethylketal, benzophenone, biacetyl, acetophenone, Michler ketone, benzyl, benzylisobutyl ether, tetramethylthiummono (di) sulfide, 2,2-azobisisobutyronitrile, and the like.
- 2,2-azobis-2,4-dimethylvaleronitrile benzoyl peroxide, di-tert-butyl peroxide, 1-hydroxycyclohexylphenylketone, 2-hydroxy-2-methyl-1-phenyl-propane-1-one , 1- (4-Isopropylphenyl) -2-hydroxy-2-methylpropan-1-one, thioxanthone, 2-chlorothioxanthone, 2-methylthioxanthone, 2,4-diethylthioxanthone, methylbenzoylformate, 2,2 -Diethoxyacetophenone, ⁇ -ionone, ⁇ -bromostyrene, diazoaminobenzene, ⁇ -amylcinnamic aldehyde, p-dimethylaminoacetophenone, p-dimethylaminopropiophenone, 2-chlorobenzophenone, p, p'-dichloro Benzophenone
- the cholesteric liquid crystal composition may contain a surfactant.
- a surfactant for example, one that does not inhibit the orientation can be appropriately selected and used.
- a surfactant for example, a nonionic surfactant containing a siloxane or an alkylfluoride group in a hydrophobic group portion is preferably mentioned.
- oligomers having two or more hydrophobic group moieties in one molecule are particularly suitable.
- Specific examples of these surfactants include OMNOVA's PolyFox PF-151N, PF-636, PF-6320, PF-656, PF-6520, PF-3320, PF-651, PF-652; Neos.
- FTX-209F, FTX-208G, FTX-204D; surflon from Seimi Chemical Co., Ltd .; KH-40, S420; etc. can be used.
- One type of surfactant may be used alone, or two or more types may be used in combination at any ratio.
- the cholesteric liquid crystal composition may optionally contain a cross-linking agent in order to improve the film strength and durability after curing.
- a cross-linking agent one that can increase the cross-linking density of the cholesteric resin layer and does not deteriorate the orientation uniformity can be appropriately selected and used.
- Such an increase in the crosslink density can be achieved by a reaction that occurs at the same time as curing when the film of the liquid crystal composition is cured, a reaction that is promoted by performing a heat treatment after curing, or a reaction that naturally proceeds by moisture. Therefore, for example, any cross-linking agent that cures with ultraviolet rays, heat, humidity, or the like can be preferably used.
- cross-linking agent examples include a polyfunctional acrylate compound; an aziridine compound; an isocyanate compound; a polyoxazoline compound having an oxazoline group in the side chain; an alkoxysilane compound;
- one type of cross-linking agent may be used alone, or two or more types may be used in combination at any ratio.
- the cholesteric liquid crystal composition may further contain other optional components as required.
- this optional component include a solvent, a polymerization inhibitor for improving pot life, an antioxidant for improving durability, an ultraviolet absorber, and a light stabilizer.
- one of these optional components may be used alone, or two or more of them may be used in combination at any ratio. The amount of these arbitrary components can be arbitrarily set as long as the desired optical performance is not deteriorated.
- the method for producing the cholesteric liquid crystal composition is not particularly limited, and the cholesteric liquid crystal composition can be produced by mixing the above components.
- a film of the liquid crystal composition is provided on the base film.
- a film of the liquid crystal composition is provided by applying the liquid crystal composition to the surface of the base film.
- a film of the liquid crystal composition is usually provided on the alignment film.
- the surface of the base film may be subjected to a treatment such as a corona discharge treatment and a rubbing treatment, if necessary.
- the alignment treatment may be performed if necessary.
- the alignment treatment can be performed, for example, by heating the film of the liquid crystal composition at 50 ° C. to 150 ° C. for 0.5 minutes to 10 minutes. By performing the alignment treatment, the liquid crystal composition in the film can be well oriented.
- a curing treatment is usually performed.
- the curing treatment can be performed, for example, by combining one or more times of light irradiation and a heating treatment.
- the heating conditions are, for example, usually 40 ° C. or higher, preferably 50 ° C. or higher, and usually 200 ° C. or lower, preferably 140 ° C. or lower, for usually 1 second or longer, preferably 5 seconds or longer, and usually 3 minutes.
- the time may be preferably 120 seconds or less.
- the light used for light irradiation includes not only visible light but also ultraviolet rays and other electromagnetic waves.
- Light irradiation can be performed, for example, by irradiating light having a wavelength of 200 nm to 500 nm for 0.01 seconds to 3 minutes. At this time, the energy of the irradiated light may be, for example, 0.01 mJ / cm 2 to 50 mJ / cm 2 .
- a cholesteric resin layer having a polarization separation function can be obtained.
- a relatively strong ultraviolet such 50mJ / cm 2 ⁇ 10,000mJ / cm 2
- a cholesteric resin layer having high mechanical strength can be obtained.
- the expansion of the reflection band and the irradiation of strong ultraviolet rays may be carried out under air, or a part or all of the steps thereof may be carried out in an atmosphere in which the oxygen concentration is controlled (for example, in a nitrogen atmosphere). ..
- the step of applying and curing the liquid crystal composition as described above is not limited to one time, and the application and curing may be repeated a plurality of times. This makes it possible to form a cholesteric resin layer including two or more layers. However, by using the liquid crystal composition described in the above example, a cholesteric resin layer containing a rod-shaped liquid crystal compound that is well oriented and having a thickness of 5 ⁇ m or more even by applying and curing the liquid crystal composition only once. Can be easily formed.
- a multilayer body including (2) a reflective linear polarizing element, a first ⁇ / 4 plate, and a second ⁇ / 4 plate can be used.
- Examples of the reflection type linear polarizing element included in such a multilayer body include a wire grid type linear polarizing element and a multilayer reflection type linear polarizing element (eg, “DBEF” manufactured by 3M Co., Ltd.).
- the thickness of the base material layer is not particularly limited, but is preferably 3.0 ⁇ m or more, more preferably 4.0 ⁇ m or more, particularly preferably 4.5 ⁇ m or more, preferably 20 ⁇ m or less, more preferably 15 ⁇ m or less, and particularly preferably. Is 10 ⁇ m or less.
- the resin pigment contained in the first printing layer is composed of fragments of the resin layer having cholesteric regularity.
- the resin pigment can be produced by forming a resin layer having cholesteric regularity (hereinafter, also referred to as resin layer A1) and crushing this layer into fragments.
- the resin layer A1 is provided with, for example, a film of the cholesteric liquid crystal composition on an appropriate support for forming the resin layer, similarly to the resin layer A2 having cholesteric regularity as the base material layer, and the cholesteric liquid crystal composition. It can be obtained by curing the film of an object.
- the cholesteric liquid crystal composition for forming the cholesteric resin layer include the same examples and preferable examples as those of the cholesteric liquid crystal composition for forming the resin layer A2.
- the resin layer A1 preferably has a reflectance of 40% or more at at least one wavelength in the visible wavelength band. As a result, the reflected image observed by incident non-polarized light on the authenticity determination member becomes clear, and it becomes easy to determine the authenticity of the authenticity determination member.
- the reflectance of the resin layer A1 is usually 50% or less.
- the resin layer A1 preferably has a half-value width of a reflection band having a reflectance of 35% or more and 50% or less of 350 nm or more. Since the resin layer A1 exerts a circularly polarized light separation function in a wide wavelength range, the authenticity of the authenticity determination member can be determined in a wide wavelength range. Further, the light reflected by the first printing layer containing the resin pigment composed of the fragments of the resin layer A1 can be made into a color close to metallic white (silver), and the degree of freedom in design can be increased.
- the thickness of the resin layer A1 is not particularly limited, but is preferably 3.0 ⁇ m or more, more preferably 4.0 ⁇ m or more, particularly preferably 4.5 ⁇ m or more, preferably 20 ⁇ m or less, more preferably 15 ⁇ m or less, and particularly preferably. Is 10 ⁇ m or less.
- the resin layer A2 and the resin layer A1 may be the same layer formed from the same cholesteric liquid crystal composition by the same method, or may be different layers from each other.
- the resin layer A2 and the resin layer A1 have the same cholesteric regularity in the twisting direction. Having the cholesteric regularity in the resin layer A2 and the resin layer A1 in the same twisting direction is, for example, the type and structure of the chiral agent used in the cholesteric liquid crystal composition for forming the resin layer A2 or the resin layer A1. Can be achieved by appropriately selecting.
- the resin layer A1 was formed on the base film and then the resin layer A1 was peeled off from the base film to obtain a resin layer piece.
- examples thereof include a method of obtaining a resin pigment which is a fragment of the resin layer A2 by crushing the resin layer piece as it is or by further crushing it with a crusher or the like, and further specific examples thereof are described in Japanese Patent Application Laid-Open No. 2015-027743. The method can be mentioned.
- the dimensions of the debris contained in the resin pigment can be arbitrarily set according to the printing method for forming the first print layer, etc., but when the first print layer is formed by the screen printing method, the resin pigment is used. Fragments that have passed through a sieve with an opening of 100 ⁇ m or less are preferable, and fragments that have passed through a sieve with an opening of 60 ⁇ m or less are more preferable.
- the resin pigment is preferably debris that does not pass through a sieve having an opening of less than 5 ⁇ m.
- the first print layer is provided on the substrate layer by any method.
- the first printing layer is preferably provided on the base material layer by a printing method.
- a printing method in addition to the method of transferring ink to the base material layer using a printing plate, ink is applied to the base material layer without using a printing plate as in the inkjet printing method.
- the method of application is also included.
- the first printing layer is provided on the base material layer by a screen printing method.
- the first printing layer containing the resin pigment can be formed, for example, by transferring or applying an ink containing the resin pigment on the base material layer.
- the content of the resin pigment in the ink is not particularly limited, but may be, for example, 1% by weight or more, for example, 5% by weight or more, for example, 15% by weight or less, for example, 10% by weight or less.
- the ink containing the resin pigment may contain any component in addition to the resin pigment.
- the optional component contained in the ink include a solvent (including a dispersion medium), a binder resin, a defoaming agent, a stabilizer, a wax, a surfactant and the like.
- the binder resin include thermosetting resins and photocurable resins.
- the thickness of the first print layer is not particularly limited and can be arbitrarily set according to the printing method for forming the first print layer and the like, but may be, for example, 30 ⁇ m to 50 ⁇ m.
- the first printing layer is provided so as to be in contact with a part of one main surface of the base material layer and forms a pattern when viewed from the thickness direction of the authenticity determination member.
- the pattern include, but are not limited to, figures such as quadrangles and triangles, and characters.
- the second printed layer contains a metal pigment that does not have a circularly polarized light separation function. Not having a circularly polarized light separation function means that both circularly polarized light having one rotation direction and circularly polarized light having the other rotation direction are reflected at the same reflectance and the same transmittance. (The transmittance may be 0%.) It means that the material is transmitted.
- the metal pigment usually includes a material having a metallic luster and not having a circularly polarized light separation function. Generally, the metal powder does not have a circularly polarized light separation function, and therefore can be used as a metal pigment that can be contained in the second printing layer. Further, a metal oxide such as silica can also be used as a material for a metal pigment.
- metal pigment materials include aluminum, copper, silver, and silica.
- powders and flakes of these materials can be used.
- flakes obtained by forming a film of a metal oxide such as metal or silica on the surface of flakes made of a material other than metal, such as glass flakes, can also be used as a metal pigment.
- the dimensions of the metal pigment can be arbitrarily set according to the printing method for forming the second print layer, etc., but when the second print layer is formed by the screen printing method, the metal pigment has an opening. Fragments that have passed through a sieve of 100 ⁇ m or less are preferable, and fragments that have passed through a sieve with an opening of 60 ⁇ m or less are more preferable.
- the metal pigment is preferably debris that does not pass through a sieve having an opening of less than 5 ⁇ m.
- the second printing layer is preferably provided on the base material layer by a printing method, and more preferably by a screen printing method.
- the second printing layer containing the metal pigment can be formed, for example, by transferring or applying an ink containing the metal pigment on the base material layer.
- the ink containing a metal pigment may contain any component in addition to the metal pigment. Examples of the optional component contained in the ink include components similar to those that can be contained in the ink containing the resin pigment.
- the thickness of the second print layer is not particularly limited and can be arbitrarily set according to the printing method for forming the second print layer and the like, but may be, for example, 30 ⁇ m to 50 ⁇ m.
- the second printed layer is provided so as to be in contact with a part of one main surface of the base material layer and forms a pattern when viewed from the thickness direction of the authenticity determination member.
- the pattern include, but are not limited to, figures such as quadrangles and triangles, and characters.
- the first print layer and the second print layer may have the same pattern or different patterns.
- the first print layer and the second print layer are provided so as not to overlap each other when viewed from the thickness direction of the authenticity determination member.
- the second print layer may be provided on the same main surface as the main surface of the base material layer provided with the first print layer, and is different from the main surface of the base material layer provided with the first print layer. It may be provided on the main surface. In one embodiment, the second print layer is provided on the same main surface as the main surface of the substrate layer on which the first print layer is provided.
- FIG. 1 is a schematic plan view of an authenticity determination member according to an embodiment of the present invention as viewed from the thickness direction.
- FIG. 2 is a diagram schematically showing a cut surface of FIG. 1 taken by line II-II.
- FIG. 3 is an explanatory diagram when the authenticity determining member according to the embodiment of the present invention is observed from one main surface side.
- FIG. 4 is an explanatory diagram when the authenticity determining member according to the embodiment of the present invention is observed from the other main surface side.
- FIG. 1 is a schematic plan view of an authenticity determination member according to an embodiment of the present invention as viewed from the thickness direction.
- FIG. 2 is a diagram schematically showing a cut surface of FIG. 1 taken by line II-II.
- FIG. 3 is an explanatory diagram when the authenticity determining member according to the embodiment of the present invention is observed from one main surface side.
- FIG. 4 is an explanatory diagram when the authenticity determining member according to the embodiment of the present invention is observed from the other main surface side.
- FIG. 5 is a schematic view showing an image when the authenticity determination member according to the embodiment of the present invention is irradiated with non-polarized light and observed.
- FIG. 6 is a schematic view showing an image when the authenticity determination member according to the embodiment of the present invention in FIG. 5 is turned upside down and irradiated with non-polarized light for observation.
- FIG. 7 is a schematic plan view of the authenticity determination member according to the comparative example as viewed from the thickness direction.
- FIG. 8 is a diagram schematically showing a cut surface by the line VIII-VIII of FIG. 7.
- FIG. 9 is an explanatory diagram when the authenticity determination member according to the comparative example is observed from one main surface side.
- FIG. 10 is an explanatory diagram when the authenticity determination member according to the comparative example is observed from the other main surface side.
- the authenticity determining member 100 includes a base material layer 10, a first printing layer 20, and a second printing layer 30.
- the base material layer 10 is a resin layer having a cholesteric regularity, which has a function as a reflective circular polarizing element, which transmits left circularly polarized light and reflects right circularly polarized light.
- the first printed layer 20 contains fragments of a resin layer having the same torsional cholesteric regularity as the substrate layer 10. Similar to the base material layer 10, the first printed layer 20 has a circularly polarized light separation function that transmits left circularly polarized light and reflects right circularly polarized light.
- the second printed layer 30 contains a metal pigment having no circularly polarized light separation function.
- the first print layer 20 and the second print layer 30 form a pattern when viewed from the thickness direction (direction perpendicular to the paper surface) of the authenticity determination member 100.
- the first print layer 20 and the second print layer 30 form a pattern of the number "8".
- the first print layer 20 and the second print layer 30 are the main surface 10U of the main surface 10U and the main surface 10D, which are the two main surfaces of the base material layer 10. It is provided directly on the top.
- the first print layer 20 and the second print layer 30 are arranged on the main surface 10U so as not to overlap each other.
- the appearance of the image when the authenticity determination member 100 is observed from the main surface 10U side by incident non-polarized light from the main surface 10U side of the authenticity determination member 100 will be described with reference to FIG.
- the first printed layer 20 has the above-mentioned circularly polarized light separation function, so that the left side It transmits light L2 L , which is circularly polarized light, and reflects light L4 R , which is right-handed circularly polarized light.
- the reflected light from the first print layer 20 is visually recognized.
- the light L2 L passes through the base material layer 10 and becomes the light L3 L.
- the unpolarized light L5 RL When the unpolarized light L5 RL is incident on the second print layer 30 from the main surface 10U side, the light L5 RL is reflected by the metal pigment contained in the second print layer 30. As a result, the unpolarized light L6 RL is visually recognized as the reflected light by the second print layer 30. Since the reflected light from the first print layer 20 and the second print layer 30 is visually recognized, the number "8" is visually recognized as the reflected image (1) as shown in FIG.
- the base material layer 10 has a function of transmitting left circularly polarized light and reflecting right circularly polarized light, so that it is a left circular light.
- the polarized light L27 L is transmitted, but the right-handed circularly polarized light is not transmitted and does not reach the first printed layer 20. Since the first print layer 20 has the circularly polarized light separation function, the light reflected by the first print layer 20 is not visible.
- the light L27 L which is the left circularly polarized light applied to the first print layer 20, passes through the first print layer 20 and becomes the light L28 L.
- the base material layer 10 transmits the light L21 L which is left-polarized light.
- the transmitted light L21 L is reflected by the metal pigment contained in the second print layer 30.
- the reflected light by the second printing layer 30 is the light L22 R which is the right circularly polarized light.
- the light L22 R is reflected by the base material layer 10, and the light L23 R, which is right-handed circularly polarized light, is incident on the second printing layer 30.
- the light L23 R is reflected by the second print layer 30, and the rotation direction of the circularly polarized light is reversed to become the light L24 L which is left-handed circularly polarized light. Since the light L24 L reflected by the second printing layer 30 is left-handed circularly polarized light, it passes through the base material layer 10 and becomes light L25 L which is left-handed circularly polarized light. That is, the light reflected by the second print layer 30 is visually recognized as the light L25 L.
- FIG. 6 is a diagram illustrating how an image looks when the authenticity determination member 100 in FIG. 5 is turned over with the axis R1 shown in FIG. 5 as a rotation axis and irradiated with non-polarized light. As shown in FIG. 6, since the reflected light by the first print layer 20 is not visually recognized and the reflected light by the second print layer 30 is visually recognized, the number "5" is visually recognized as the reflected image (2). NS.
- the authenticity determination member 100 has a reflection image (1) obtained by incidentally observing a non-polarized light from the side of one main surface 10U and a non-polarized light incident from the side of the other main surface 10D. It is different from the reflected image (2) obtained by observing it. Therefore, the difference between the reflected image (1) and the reflected image (2) can be one of the determination conditions for authenticity of the authenticity determination member 100.
- the base material layer 10 which is a reflective circular polarizing element is a resin layer having cholesteric regularity, but in another embodiment, the base material layer is a reflective linear polarizing element and the above. Includes a first ⁇ / 4 plate provided on one main surface of the reflective linear polarizing element and a second ⁇ / 4 plate provided on the other main surface of the reflective linear polarizing element. It may be a reflective circular polarizing element.
- the authenticity determination member 500 includes a base material layer 510, a first print layer 520, and a second print layer 530.
- the base material layer 510 has a function as an absorption type circular polarizing element that transmits left circularly polarized light and absorbs right circularly polarized light.
- the first print layer 520 has a circularly polarized light separation function that transmits left circularly polarized light and reflects right circularly polarized light.
- the second print layer 530 contains a metal pigment having no circularly polarized light separation function.
- the first print layer 520 and the second print layer 530 form a pattern when viewed from the thickness direction (direction perpendicular to the paper surface) of the authenticity determination member 500.
- the first print layer 520 and the second print layer 530 form a pattern of the number "8".
- the base material layer 510 includes a retardation layer 512 having a function as a ⁇ / 4 plate, a linear polarizing element 511, and a retardation layer 513 having a function as a ⁇ / 4 plate. It is laminated in order.
- the slow axis of the retardation layer 512, the absorption axis of the linear splitter 511, and the slow axis of the retardation layer 513 form an angle such that the transmitted light of the substrate layer 510 is polarized to the left. ..
- the first print layer 520 and the second print layer 530 are the main surface 510U of the main surface 510U and the main surface 510D, which are the two main surfaces of the base material layer 10. It is provided directly on the top.
- the first print layer 520 and the second print layer 530 are arranged on the main surface 510U so as not to overlap each other.
- the transmitted linearly polarized light L33 ST becomes the left circularly polarized light L34 L by transmitting through the retardation layer 513.
- the unpolarized light L36 RL is incident on the second print layer 530, the light L36 RL is reflected by the metal pigment contained in the second print layer 530.
- the unpolarized light L37 RL is visually recognized as the reflected light by the second print layer 530. Since the reflected light from the first print layer 520 and the second print layer 530 is visually recognized, the number "8" is visually recognized as a reflected image.
- the transmitted light L48 ST becomes light L49 L which is left-handed circularly polarized light by transmitting through the retardation layer 512.
- the light L49 L is incident on the first print layer 520, but is not reflected by the first print layer 520 because it is left-handed circularly polarized light. Therefore, the reflected light from the first print layer 520 is not visible.
- the light L49 L passes through the first print layer 520 and becomes the light L50 L.
- the unpolarized light L40 RL incident from the side of the main surface 510D passes through the retardation layer 513 to become unpolarized light L41 RL , and a part of the light L41 RL passes through the linear splitter 511.
- the light L43 L is reflected by the metal pigment contained in the second print layer 530, and the rotation direction of the circularly polarized light is reversed to become the light L44 R which is right-handed circularly polarized light.
- the light L44 R is converted into light L45 ST which is linearly polarized light by passing through the retardation layer 512.
- the optical L45 ST is in a direction parallel to the absorption axis of the linear polarizing element 511. It is linearly polarized light having the vibration direction of. Therefore, it is absorbed by the linear polarizing element 511. Therefore, the reflected light of the second print layer 530 is not visible. Therefore, unlike the authenticity determination member 100, when observed from the side of the main surface 510D, not only the reflected light by the first print layer 520 but also the reflected light by the second print layer 530 is not visually recognized.
- the authenticity determination member 100 has the reflected light reflected by the second printing layer 30 regardless of whether it is observed from one main surface 10U or the other main surface 10D. Can be visually recognized as a metallic color. Utilizing this action, the authenticity determination member 100 can express various patterns on both the front surface and the back surface.
- the authenticity determination member is suitably used for determining the authenticity of an article by attaching it to an article whose authenticity should be identified by utilizing the fact that the reflected images displayed on the front and back are different.
- goods for which authenticity should be determined include goods such as cash vouchers, gift certificates, tickets, certificates, and security cards.
- the authenticity determination member may be used as these articles themselves.
- the authenticity determination member can also be used as a form such as a label for authenticity determination.
- the authenticity determination member can determine the authenticity by utilizing the above-mentioned action.
- the method for determining authenticity according to an embodiment of the present invention includes a step (1) of obtaining a reflected image (1) by incident non-polarized light from one main surface side of the authenticity determination member and observing the member.
- the step (3) is included. Step (1) and step (2) are usually not performed at the same time. After the step (1) and the step (2), the step (3) is performed.
- “Different” means that when the reflected image (1) and the reflected image (2) are compared, a part that is not in one image appears in the other image, and the reflected image (1) and the reflected image (1) are reflected. It usually does not include the case where the image (2) has a mirror image relationship.
- Example 1 (1-1. Preparation of cholesteric liquid crystal composition) BASF's "Pariocolor LC242" as a polymerizable liquid crystal compound, BASF's “Pariocolor LC756” as a chiral agent, BASF's “IrgacureOXE02” as a photopolymerization initiator, and AGC Seimi Chemical's "Surflon S420” as a leveling agent. , And methyl ethyl ketone (MEK) as a solvent were mixed in the formulation shown in Table 1 to prepare a cholesteric liquid crystal composition (solid content 20% by weight) for forming a cholesteric resin layer.
- the chemical structures of "Pariocolor LC242", “Palocolor LC756", and “IrgacureOXE02" are shown below.
- the cholesteric liquid crystal composition prepared as described above was applied onto a cycloolefin polymer (COP) film using a # 10 wire bar to form a coating film of the liquid crystal composition.
- the coating film of the liquid crystal composition was held at 140 ° C. for 2 minutes for orientation treatment, followed by irradiation treatment of the coating film with weak ultraviolet rays (wavelength 365 nm) of 25 mJ / cm 2, followed by 1 at 90 ° C.
- a process consisting of a minute heating treatment was carried out, and then the coating film was cured by irradiating with ultraviolet rays of 2000 mJ / cm 2 in a nitrogen atmosphere.
- a film F having a circularly polarized light separation function in which a cholesteric resin layer having a thickness of 5 ⁇ m was formed on the PET film, was produced.
- the light reflectance of the cholesteric resin layer was measured using "V570" manufactured by JASCO Corporation in the wavelength range of 380 nm to 830 nm.
- the reflectance was 40% or more at at least one wavelength in the wavelength range of 380 nm or more and 830 nm or less. From the obtained reflectance spectrum, the wavelength range (full width at half maximum), which is the half value of the maximum reflectance, was read in the reflection band where the reflectance was 35% or more and 50% or less, and it was 350 nm.
- the right circularly polarizing plate has a function of absorbing left circularly polarized light and transmitting right circularly polarized light. Specifically, the reflected light from the cholesteric resin layer was observed through the right circular polarizing plate, and it was confirmed by observing the colored reflected light.
- the film F was attached to the film delivery section in a direction in which the film F could be folded back with the cholesteric resin layer outside the PET film at the corners of the bar. Then, the film F was sent out from the film feeding unit in a state where tension was applied to the film F in the transport direction by the film collecting unit. At this time, the magnitude of the tension applied to the film was set to 80 N / m. In addition, air was injected from the nozzle at a pressure of 0.5 MPa.
- the film F began to grow in the transport direction from the time when it was sent from the film delivery unit. Further, after that, the film F stretched beyond the tensile elongation at break of the cholesteric resin layer was folded back at the corner portion of the bar, and more cracks were formed.
- the film F was conveyed to the nozzle and air was blown from the nozzle.
- the cholesteric resin layer in which the cracks were formed was blown off as peeled pieces.
- the peeled pieces of the obtained cholesteric resin layer were collected by a collector. Further, the PET film from which the cholesteric resin layer had been peeled off was wound up in a roll shape at the film recovery unit and recovered.
- the collected exfoliated pieces were crushed with a cutter mill to form fragments of the cholesteric resin layer, and then passed through a sieve having an opening of 51 ⁇ m. Fragments of the cholesteric resin layer that passed through the sieve were collected and used as a resin pigment. Since the fragments of the resin layer constituting the resin pigment are produced from the cholesteric resin layer included in the film F as a raw material, they have the same cholesteric regularity in the twisting direction as the cholesteric resin layer included in the film F.
- thermosetting medium (“LOV (E) -800” manufactured by Seiko Advance Co., Ltd.) so as to be 8% by weight based on the total amount of ink, and is used for forming the first printing layer.
- Ink 1 was used.
- the authenticity determination member 100 was manufactured by forming by a printing method.
- Step (1) The authenticity determination member 100 was placed on white paper with the side on which the first print layer 20 and the second print layer 30 were printed (main surface 10U) facing up.
- the authenticity determination member 100 placed on white paper was irradiated with non-polarized light from the side of the main surface 10U, and a reflected image was observed from the side of the main surface 10U.
- the number "8" was observed.
- the number "8" as the observed reflection image (1) was silver.
- Step (2) Next, the authenticity determination member 100 is turned over with the axis R1 shown in FIG. 5 as the axis, and the surface on the side where the first print layer 20 and the second print layer 30 are not printed (referred to as the main surface 10D). Placed on white paper with the top facing up.
- the authenticity determination member 100 was irradiated with unpolarized light from the side of the main surface 10D, and the reflected image was observed from the side of the main surface 10D. As a result, the reflected light by the first print layer 20 was not observed, the reflected light by the second print layer 30 was observed, and the number "5" was observed as shown in FIG. The number "5" as the observed reflection image (2) was silver.
- Example 2 (2-6. Manufacture of authenticity judgment member)
- a reflective circular polarizing element including a reflective linear polarizing element was prepared.
- This reflective circularly polarized light has two retardation layers (Zeon Corporation's "Zeonoa Film ZD Series") that function as ⁇ / 4 plates on both sides of a reflective linear polarizing element ("DBEF" manufactured by 3M Corporation). ") Are laminated.
- DBEF reflective linear polarizing element
- two retardation layers are arranged on both sides of the reflective linear polarizing element so that the transmitted light is left-handed circularly polarized light.
- a triangular pattern is printed on one surface of the substrate layer by a screen printing method using ink 1 as a first printing layer, and an ink 2 is used as a second printing layer to screen a triangular contour pattern.
- An authenticity determination member was manufactured by printing by a printing method.
- the pattern printed by the ink 2 follows the outline of the triangular pattern printed by the ink 1.
- Ink 1 and ink 2 are prepared in the same manner as in Example 1.
- Step (1) Next, the authenticity determination member was placed on white paper with the first print layer and the side on which the second print layer was printed (referred to as the first main surface) facing up.
- the authenticity determination member placed on the white paper was irradiated with non-polarized light from the first main surface side, and the reflected image was observed from the first main surface side.
- the reflected light from the first print layer and the second print layer was observed, and a triangle was observed.
- the triangle as the observed reflection image (1) was silver.
- Step (2) Next, the authenticity determination member was turned over and placed on white paper with the side on which the first print layer and the second print layer were not printed (referred to as the second main surface) facing up.
- the authenticity determination member was irradiated with non-polarized light from the side of the second main surface, and the reflected image was observed from the side of the second main surface.
- the reflected light from the first print layer triangle pattern
- the reflected light from the second print layer triangle contour pattern
- the outline of the triangle as the observed reflection image (2) was silver.
- the first print layer 520 and the second print layer 530 are screen-printed on the surface of the base material layer 510 on the side of the retardation layer 512 using ink 1 and ink 2, respectively, so as to have the pattern shown in FIG.
- the authenticity determination member 500 was manufactured by the method.
- Ink 1 and ink 2 are prepared in the same manner as in Example 1.
- the authenticity determination member 500 was placed on white paper with the side on which the first print layer 520 and the second print layer 530 were printed (referred to as the main surface 510U) facing up.
- the authenticity determination member 500 placed on white paper was irradiated with non-polarized light from the side of the main surface 510U, and the reflected image was observed from the side of the main surface 510U. As a result, the number "8" was observed.
- the number "8" as the observed reflection image (1) was silver.
- the authenticity determination member 500 is turned inside out with the vertical direction of the paper surface of FIG. 7 as the axis, and the surface on the side where the first print layer 520 and the second print layer 530 are not printed (main surface 510D) is used. ) Is on top and placed on white paper. The authenticity determination member 500 was irradiated with unpolarized light from the side of the main surface 510D, and the reflected image was observed from the side of the main surface 510D. As a result, no silver reflection image was observed, only the black number "5" was observed.
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Abstract
Description
すなわち、本発明は、以下を提供する。
コレステリック規則性を有する樹脂層A1の破片である樹脂顔料を含み、前記基材層上に設けられた第一の印刷層と、
円偏光分離機能を有さない金属顔料を含み、前記基材層上に設けられた第二の印刷層とを含む、真贋判定部材。
[2] 前記真贋判定部材の一方の主面側から非偏光を入射させて観察された反射像(1)と、前記真贋判定部材の他方の主面側から非偏光を入射させて観察された反射像(2)とが異なる、[1]に記載の真贋判定部材。
[3] 前記樹脂層A1が、可視波長帯域の少なくとも一の波長において反射率が40%以上であり、且つ、反射率が35%以上50%以下である反射帯域の半値幅が350nm以上である、[1]又は[2]に記載の真贋判定部材。
[4] 前記基材層が、コレステリック規則性を有する樹脂層A2であり、前記樹脂層A1と樹脂層A2とが、同一のねじれ方向のコレステリック規則性を有する、[1]~[3]のいずれか一項に記載の真贋判定部材。
[5] 前記樹脂層A2が、可視波長帯域の少なくとも一の波長において反射率が40%以上であり、且つ、反射率が35%以上50%以下である反射帯域の半値幅が350nm以上である、[4]に記載の真贋判定部材。
[6] 前記基材層が、反射型直線偏光子と、前記反射型直線偏光子の一方の主面上に設けられた第一のλ/4板と、前記反射型直線偏光子の他方の主面上に設けられた第二のλ/4板とを含む反射型円偏光子である、[1]又は[2]に記載の真贋判定部材。
[7] [1]~[6]のいずれか一項に記載の真贋判定部材の一方の主面側から非偏光を入射させて観察し、反射像(1)を得る工程(1)、
前記真贋判定部材の、他方の主面側から非偏光を入射させて観察し、反射像(2)を得る工程(2)、及び
前記反射像(1)と前記反射像(2)とが異なることを判定する工程(3)を含む、真贋判定部材の真正性判定方法。
本発明の一実施形態に係る真贋判定部材は、基材層と、前記基材層上に設けられた第一の印刷層と、前記基材層上に設けられた第二の印刷層とを含む。前記基材層は、反射型円偏光子である。前記第一の印刷層は、コレステリック規則性を有する樹脂層A1の破片である樹脂顔料を含む。前記第二の印刷層は、円偏光分離機能を有さない金属顔料を含む。
基材層は、反射型円偏光子である。反射型円偏光子とは、右回りの回転方向を有する円偏光及び左回りの回転方向を有する円偏光のうち、一方の回転方向を有する円偏光を反射し、他方の回転方向を有する円偏光を透過させうる機能を有する偏光子を意味する。かかる機能を、円偏光分離機能ともいう。
反射型円偏光子は、基材フィルムなどを含む、複層体であってもよい。かかる反射型円偏光子の例としては、(1)コレステリック規則性を有する樹脂層、(2)反射型直線偏光子と、前記反射型直線偏光子の一方の主面上に設けられた第一のλ/4板と、前記反射型直線偏光子の他方の主面上に設けられた第二のλ/4板とを含む複層体(反射型直線偏光子の両面上に、λ/4板が設けられた複層体)が挙げられる。基材層としては、コレステリック規則性を有する樹脂層を含む層が好ましく、コレステリック規則性を有する樹脂層であることがより好ましい。
また、コレステリック樹脂層は、反射率が35%以上50%以下である反射帯域の半値幅が350nm以上であることが好ましい。広い波長範囲においてコレステリック樹脂層が円偏光分離機能を発揮することにより、真贋判定部材の真正性判定を、広い範囲の波長において行うことができる。また、コレステリック樹脂層の反射光を、金属調の白色(銀色)に近い色にすることができ、デザインの自由度を高めることができる。半値幅の上限は、特に限定されず、可視光帯域の全域にわたる幅としうる。例えば500nm以下、又は400nm以下としうる。
R1-C1-D1-C3-M-C4-D2-C2-R2 (1)
重合性官能基の例としては、カルボキシル基、(メタ)アクリロイル基、エポキシ基、チオエポキシ基、メルカプト基、イソシアネート基、イソチオシアネート基、オキセタン基、チエタニル基、アジリジニル基、ピロール基、ビニル基、アリル基、フマレート基、シンナモイル基、オキサゾリン基、ヒドロキシル基、アルコキシシリル基、及びアミノ基などが挙げられる。
ここで、R3及びR4は、水素原子又は炭素原子数1~10のアルキル基を表す。R3及びR4がアルキル基である場合、当該アルキル基には、-O-、-S-、-O-C(=O)-、-C(=O)-O-、-O-C(=O)-O-、-NR5-C(=O)-、-C(=O)-NR5-、-NR5-、または-C(=O)-が介在していてもよい(ただし、-O-および-S-がそれぞれ2以上隣接して介在する場合を除く。)。ここで、R5は、水素原子または炭素原子数1~6のアルキル基を表す。前記「置換基を有してもよい炭素原子数1~10個のアルキル基」における置換基としては、ハロゲン原子、ヒドロキシル基、カルボキシル基、シアノ基、アミノ基、炭素原子数1~6個のアルコキシ基、炭素原子数2~8個のアルコキシアルコキシ基、炭素原子数3~15個のアルコキシアルコキシアルコキシ基、炭素原子数2~7個のアルコキシカルボニル基、炭素原子数2~7個のアルキルカルボニルオキシ基、炭素原子数2~7個のアルコキシカルボニルオキシ基等が挙げられる。
R6-A1-Z-A2-R7 (2)
また、前記ハロゲン原子、ヒドロキシル基、カルボキシル基、(メタ)アクリロイル基、エポキシ基、メルカプト基、イソシアネート基、アミノ基、及びシアノ基は、炭素原子数1~2個のアルキル基及び/又はアルキレンオキサイド基と結合していてもよい。
重合開始剤の例としては、光重合開始剤が挙げられる。光重合開始剤としては、例えば、紫外線又は可視光線によってラジカル又は酸を発生させる公知の化合物が使用できる。
市販品としては、例えば、BASF社のイルガキュアOXE02などを用いることができる。
重合開始剤は、1種類を単独で用いてもよく、2種類以上を任意の比率で組み合わせて用いてもよい。
界面活性剤は、1種類を単独で用いてもよく、2種類以上を任意の比率で組み合わせて用いてもよい。
加温条件は、例えば、通常40℃以上、好ましくは50℃以上、また、通常200℃以下、好ましくは140℃以下の温度において、通常1秒以上、好ましくは5秒以上、また、通常3分以下、好ましくは120秒以下の時間としうる。
また、光照射に用いる光とは、可視光のみならず紫外線及びその他の電磁波をも含む。光照射は、例えば、波長200nm~500nmの光を0.01秒~3分照射することにより行うことができる。この際、照射される光のエネルギーは、例えば、0.01mJ/cm2~50mJ/cm2としうる。
第一の印刷層に含まれる樹脂顔料は、コレステリック規則性を有する樹脂層の破片からなる。樹脂顔料は、コレステリック規則性を有する樹脂層(以下、樹脂層A1ともいう。)を形成し、この層を、破砕等して破片にすることにより製造できる。
また、樹脂層A1は、反射率が35%以上50%以下である反射帯域の半値幅が350nm以上であることが好ましい。広い波長範囲において樹脂層A1が円偏光分離機能を発揮することにより、真贋判定部材の真正性判定を、広い範囲の波長において行うことができる。また、樹脂層A1の破片からなる樹脂顔料を含む第一の印刷層による反射光を、金属調の白色(銀色)に近い色にすることができ、デザインの自由度を高めることができる。
なかでも、第一の印刷層は、スクリーン印刷法により基材層上に設けられることが好ましい。
バインダー樹脂としては、熱硬化型樹脂及び光硬化型樹脂が挙げられる。
第二の印刷層は、円偏光分離機能を有さない金属顔料を含む。円偏光分離機能を有さないとは、円偏光のうち、一方の回転方向を有する円偏光及び他方の回転方向を有する円偏光の両方を、互いに同じ反射率で反射し、かつ互いに同じ透過率(透過率は、0%であってもよい。)で透過させることを意味する。金属顔料は、通常、金属光沢を有する材料であって、円偏光分離機能を有さない材料を含む。通常、金属の粉体は、円偏光分離機能を有さないため、第二の印刷層に含まれうる金属顔料として用いうる。また、シリカなどの金属酸化物も、金属顔料の材料として用いうる。
金属顔料を含むインクは、前記金属顔料に加えて、任意の成分を含みうる。インクに含まれる任意の成分としては、前記樹脂顔料を含むインクに含まれうる成分と同様の成分が挙げられる。
第二の印刷層は、第一の印刷層が設けられた基材層主面と同じ主面上に設けられていてもよく、第一の印刷層が設けられた基材層主面と異なる主面上に設けられていてもよい。一実施形態では、第二の印刷層は、第一の印刷層が設けられた基材層主面と同じ主面上に設けられる。
以下、本発明の一実施形態に係る真贋判定部材の作用について、図を用いて説明する。図1は、本発明の一実施形態に係る真贋判定部材を、厚み方向から見た模式的な平面図である。図2は、図1のII-II線による切断面を模式的に示す図である。図3は、本発明の一実施形態に係る真贋判定部材を一方の主面側から観察したときの説明図である。図4は、本発明の一実施形態に係る真贋判定部材を他方の主面側から観察したときの説明図である。図5は、本発明の一実施形態に係る真贋判定部材に非偏光を照射して観察したときの像を示す模式図である。図6は、図5における本発明の一実施形態に係る真贋判定部材を裏返して、非偏光を照射して観察したときの像を示す模式図である。図7は、比較例に係る真贋判定部材を、厚み方向から見た模式的な平面図である。図8は、図7のVIII-VIII線による切断面を模式的に示す図である。図9は、比較例に係る真贋判定部材を一方の主面側から観察したときの説明図である。図10は、比較例に係る真贋判定部材を他方の主面側から観察したときの説明図である。
第一の印刷層20及び第二の印刷層30による反射光が視認されるので、図5に示すとおり、反射像(1)として、数字の「8」が視認される。
図7に示したとおり、真贋判定部材500は、基材層510と、第一の印刷層520と、第二の印刷層530とを含む。基材層510は、左円偏光を透過させ、右円偏光を吸収する、吸収型円偏光子としての機能を有する。第一の印刷層520は、左円偏光を透過させ、右円偏光を反射する円偏光分離機能を有する。第二の印刷層530は、円偏光分離機能を有さない金属顔料を含む。第一の印刷層520と第二の印刷層530とは、真贋判定部材500の厚み方向(紙面と垂直な方向)から見て、パターンを形成している。本例では、真贋判定部材100と同様に、第一の印刷層520と第二の印刷層530とで、数字の「8」のパターンを形成している。図8に示すとおり、基材層510は、λ/4板としての機能を有する位相差層512と、直線偏光子511と、λ/4板としての機能を有する位相差層513とが、この順で積層されてなる。位相差層512の遅相軸と、直線偏光子511の吸収軸と、位相差層513の遅相軸とは、基材層510の透過光が左円偏光となるような角度をなしている。図8に示すとおり、第一の印刷層520と第二の印刷層530とは、基材層10の二つの主面である、主面510U及び主面510Dのうち、一方の主面510Uの上に直接設けられている。第一の印刷層520と第二の印刷層530とは、互いに重ならないように主面510Uの上に配置されている。
非偏光である光L36RLを第二の印刷層530に入射させると、光L36RLは第二の印刷層530に含まれる金属顔料により反射される。その結果、第二の印刷層530による反射光として、非偏光である光L37RLが視認される。
第一の印刷層520及び第二の印刷層530による反射光が視認されるので、反射像として数字の「8」が視認される。
よって、真贋判定部材100と異なり、主面510Dの側から観察した場合、第一の印刷層520による反射光のみならず、第二の印刷層530による反射光も視認されない。
真贋判定部材は、表と裏とで、表示される反射像が異なることを利用して、真正性を識別すべき物品に付して物品の真正性を判定するために好適に用いられる。真正性を判定すべき物品の例としては、金券、商品券、チケット、証明書、セキュリティカード等の物品が挙げられる。真贋判定部材をこれら物品そのものとしてもよい。真贋判定部材は、真正性判定用のラベルなどの形態として用いることもできる。
本発明の一実施形態に係る真贋判定部材は、前記作用を利用することにより、真正性を判定できる。
本発明の一実施形態に係る真贋判定部材の判定方法は、真贋判定部材の一方の主面側から非偏光を入射させて観察し、反射像(1)を得る工程(1)、前記真贋判定部材の、他方の主面側から非偏光を入射させて観察し、反射像(2)を得る工程(2)、及び前記反射像(1)と前記反射像(2)とが異なることを判定する工程(3)を含む。
工程(1)と工程(2)とは、通常同時に行われない。工程(1)及び工程(2)の後に、工程(3)が行われる。
(1-1.コレステリック液晶組成物の調製)
重合性液晶化合物としてBASF社製「Paliocolor LC242」と、カイラル剤としてBASF社製「Paliocolor LC756」と、光重合開始剤としてBASF社製「IrgacureOXE02」と、レベリング剤としてAGCセイミケミカル社製「サーフロンS420」と、溶剤としてメチルエチルケトン(MEK)とを、表1記載の配合で混合することにより、コレステリック樹脂層を形成するためのコレステリック液晶組成物(固形分20重量%)を調製した。
「Paliocolor LC242」、「Paliocolor LC756」、及び「IrgacureOXE02」の化学構造を下記に示す。
シクロオレフィンポリマー(COP)フィルム上に、前記のとおり調製したコレステリック液晶組成物を#10のワイヤーバーを使用して塗布し、液晶組成物の塗膜を形成した。液晶組成物の塗膜を、140℃で2分間保持して配向処理し、次いで当該塗膜に対して25mJ/cm2の微弱な紫外線(波長365nm)の照射処理と、それに続く90℃で1分間の加温処理とからなるプロセスを実施し、次いで窒素雰囲気下で2000mJ/cm2の紫外線を照射して、塗膜を硬化させた。これにより、厚み5μmのコレステリック樹脂層がPETフィルム上に形成されている、円偏光分離機能を有するフィルムFを作成した。コレステリック樹脂層について、波長380nm~波長830nmの範囲で、日本分光社製「V570」を用いて光線反射率を測定した。その結果、波長380nm以上830nm以下の範囲の少なくとも一の波長において、反射率が40%以上であった。得られた反射率スペクトルから、反射率が35%以上50%以下である反射帯域において、最大の反射率の半値である波長範囲(半値幅)を読み取ったところ、350nmであった。コレステリック樹脂層が右円偏光を反射することを、コレステリック樹脂層を、右円偏光板を通して観察することにより確認した。ここで、右円偏光板は、左円偏光を吸収し、右円偏光を透過させる機能を有する。具体的には、右円偏光板を通してコレステリック樹脂層からの反射光を観察し、色付いた反射光が見える事により確認した。
以下に述べるように、特開2015-027743号公報の実施例記載の方法を参照して、フィルムFからコレステリック樹脂層を剥離して、破片とし、樹脂顔料として用いた。
得られた樹脂顔料を、熱硬化型メジウム(セイコーアドバンス社製「LOV(E)-800」)に、インク全量に対して8重量%となるように加えて、第一の印刷層形成用のインク1とした。
アルミニウムの粉末(堀金箔紛株式会社社製「スタンダードNo.60」)を熱硬化型メジウム(セイコーアドバンス社製「LOV(E)-800」)に、インク全量に対して10重量%となるように加えて、第二の印刷層形成用のインク2とした。
基材層10としてのフィルムFの、コレステリック樹脂層の面に、図1に示すパターンとなるように第一の印刷層20及び第二の印刷層30をそれぞれインク1及びインク2を用いてスクリーン印刷法により形成し、真贋判定部材100を製造した。
真贋判定部材100を、第一の印刷層20及び第二の印刷層30が印刷された側の面(主面10Uとする。)を上にして白い紙の上に載せた。白い紙の上に載せた真贋判定部材100に、主面10Uの側から非偏光を照射して、主面10Uの側から反射像を観察した。その結果、図5に示すとおりに、数字の「8」が観察された。観察された反射像(1)としての数字の「8」は、銀色であった。
次いで、真贋判定部材100を、図5に示す軸R1を軸にして裏返して、第一の印刷層20及び第二の印刷層30が印刷されていない側の面(主面10Dとする。)を上にして白い紙の上に載せた。真贋判定部材100に、主面10Dの側から非偏光を照射して、主面10Dの側から反射像を観察した。その結果、第一の印刷層20による反射光は観察されず、第二の印刷層30による反射光が観察されて、図6に示すとおりに、数字の「5」が観察された。観察された反射像(2)としての数字の「5」は、銀色であった。
反射像(1)としての数字の「8」と、反射像(2)としての数字の「5」とは、明らかに異なり、鏡像の関係でもない。
(2-6.真贋判定部材の製造)
基材層として、反射型直線偏光子を含む、反射型円偏光子を用意した。この反射型円偏光子は、反射型直線偏光子(3M社製「DBEF」)の両面に、λ/4板としての機能を有する二枚の位相差層(日本ゼオン社製「ゼオノアフィルム ZDシリーズ」)が積層されている。この円偏光板では、透過光が左円偏光となるように、反射型直線偏光子の両面に二枚の位相差層が配置されている。
基材層の一方の面に、第一の印刷層としてインク1を用いて三角形のパターンをスクリーン印刷法により印刷し、また第二の印刷層としてインク2を用いて、三角形の輪郭パターンをスクリーン印刷法により印刷して、真贋判定部材を製造した。
インク2により印刷されたパターンは、インク1により印刷された三角形のパターンの輪郭に沿うものである。インク1及びインク2は、実施例1と同様にして調整されたものである。
次いで、真贋判定部材を、第一の印刷層及び第二の印刷層が印刷された側の面(第一の主面とする。)を上にして白い紙の上に載せた。白い紙の上に載せた真贋判定部材に、第一の主面側から非偏光を照射して、第一の主面の側から反射像を観察した。その結果、第一の印刷層及び第二の印刷層による反射光が観察されて、三角形が観察された。観察された反射像(1)としての三角形は、銀色であった。
次いで、真贋判定部材を裏返して、第一の印刷層及び第二の印刷層が印刷されていない側の面(第二の主面とする。)を上にして白い紙の上に載せた。真贋判定部材に、第二の主面の側から非偏光を照射して、第二の主面の側から反射像を観察した。その結果、第一の印刷層(三角形のパターン)による反射光は観察されず、第二の印刷層(三角形の輪郭パターン)による反射光が観察されて、三角形の輪郭のみが観察された。観察された反射像(2)としての三角形の輪郭は、銀色であった。
反射像(1)として三角形と、反射像(2)としての三角形の輪郭とは、明らかに異なり、鏡像の関係でもない。
また、反射像(2)としての三角形の輪郭は、黒色ではなく銀色であり、反射像(1)における三角形の輪郭の色と変わらなかった。
(C1-6.真贋判定部材の製造)
基材層510として、吸収型の円偏光板を用意した。この円偏光板は、吸収型の直線偏光子511(サンリッツ社製「HLC2-5618S」)の両面に、λ/4板としての機能を有する、位相差層512及び位相差層513(いずれも日本ゼオン社製「ゼオノアフィルム ZDシリーズ」)が積層されてなる。この円偏光板では、透過光が左円偏光となるように、位相差層512及び位相差層513と直線偏光子511とが配置されている。
基材層510の、位相差層512の側の面に、図7に示すパターンとなるように第一の印刷層520及び第二の印刷層530をそれぞれインク1及びインク2を用いてスクリーン印刷法により形成し、真贋判定部材500を製造した。インク1及びインク2は、実施例1と同様にして調製されたものである。
次いで、真贋判定部材500を、第一の印刷層520及び第二の印刷層530が印刷された側の面(主面510Uとする。)を上にして白い紙の上に載せた。白い紙の上に載せた真贋判定部材500に、主面510Uの側から非偏光を照射して、主面510Uの側から反射像を観察した。その結果、数字の「8」が観察された。観察された反射像(1)としての数字の「8」は、銀色であった。
次いで、真贋判定部材500を、図7の紙面の縦方向を軸にして裏返して、第一の印刷層520及び第二の印刷層530が印刷されていない側の面(主面510Dとする。)を上にして白い紙の上に載せた。真贋判定部材500に、主面510Dの側から非偏光を照射して、主面510Dの側から反射像を観察した。その結果、銀色の反射像は観察されず、黒色の数字の「5」が観察されるのみであった。
前記のとおり、反射像(1)は得られたが、銀色の反射像(2)は得られなかった。
10U 主面
10D 主面
100 真贋判定部材
20 第一の印刷層
30 第二の印刷層
500 真贋判定部材
510 基材層
510U 主面
510D 主面
511 直線偏光子
512 位相差層
513 位相差層
520 第一の印刷層
530 第二の印刷層
Claims (7)
- 反射型円偏光子である基材層と、
コレステリック規則性を有する樹脂層A1の破片である樹脂顔料を含み、前記基材層上に設けられた第一の印刷層と、
円偏光分離機能を有さない金属顔料を含み、前記基材層上に設けられた第二の印刷層とを含む、真贋判定部材。 - 前記真贋判定部材の一方の主面側から非偏光を入射させて観察された反射像(1)と、前記真贋判定部材の他方の主面側から非偏光を入射させて観察された反射像(2)とが異なる、請求項1に記載の真贋判定部材。
- 前記樹脂層A1が、可視波長帯域の少なくとも一の波長において反射率が40%以上であり、且つ、反射率が35%以上50%以下である反射帯域の半値幅が350nm以上である、請求項1又は2に記載の真贋判定部材。
- 前記基材層が、コレステリック規則性を有する樹脂層A2であり、前記樹脂層A1と樹脂層A2とが、同一のねじれ方向のコレステリック規則性を有する、請求項1~3のいずれか1項に記載の真贋判定部材。
- 前記樹脂層A2が、可視波長帯域の少なくとも一の波長において反射率が40%以上であり、且つ、反射率が35%以上50%以下である反射帯域の半値幅が350nm以上である、請求項4に記載の真贋判定部材。
- 前記基材層が、反射型直線偏光子と、前記反射型直線偏光子の一方の主面上に設けられた第一のλ/4板と、前記反射型直線偏光子の他方の主面上に設けられた第二のλ/4板とを含む反射型円偏光子である、請求項1又は2に記載の真贋判定部材。
- 請求項1~6のいずれか一項に記載の真贋判定部材の一方の主面側から非偏光を入射させて観察し、反射像(1)を得る工程(1)、
前記真贋判定部材の、他方の主面側から非偏光を入射させて観察し、反射像(2)を得る工程(2)、及び
前記反射像(1)と前記反射像(2)とが異なることを判定する工程(3)を含む、真贋判定部材の真正性判定方法。
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| CN202180035568.5A CN115605353B (zh) | 2020-05-28 | 2021-05-12 | 真伪判断构件及其真实性判断方法 |
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| WO2023189967A1 (ja) * | 2022-03-30 | 2023-10-05 | 日本ゼオン株式会社 | 識別媒体 |
| JP7559860B1 (ja) | 2023-03-31 | 2024-10-02 | 大日本印刷株式会社 | 重合性コレステリック液晶組成物、光学異方性膜、及び電磁波反射膜 |
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| JPWO2021241226A1 (ja) | 2021-12-02 |
| EP4159454A4 (en) | 2024-06-26 |
| EP4159454A1 (en) | 2023-04-05 |
| JP7700788B2 (ja) | 2025-07-01 |
| CN115605353B (zh) | 2024-07-23 |
| CN115605353A (zh) | 2023-01-13 |
| EP4159454B1 (en) | 2025-05-14 |
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