Laminate for forgery prevention, accessory of laminate for forgery prevention, and method for producing same

Abstract

To provide a technique for expanding an application range of authenticity determination.SOLUTION: A laminate for forgery prevention comprises: a transparent substrate; a thin line pattern formed on one surface of the transparent substrate; and a light scattering layer having a total light transmittance of 70% or more and a haze of 80% or more and covering the thin line pattern.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a counterfeit prevention laminate, an accessory to the counterfeit prevention laminate, and a method for producing the same. [Background technology]

[0002] As a measure to prevent the distribution of counterfeit goods, a system is known in which a two-dimensional code or an RF (Radio Frequency Identification) tag is attached to a product to determine whether the product is genuine. For example, Patent Document 1 discloses an authenticity determination device that reads identification information of an object with a mobile terminal, and uses that information to determine whether the object is genuine and also to confirm distribution information of the object. Furthermore, for example, Patent Document 2 discloses a determination device that determines the authenticity of a hologram image formed by a diffraction pattern. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 2020-123108 [Patent Document 2] Japanese Patent Application Laid-Open No. 2001-307172 Summary of the Invention [Problem to be solved by the invention]

[0004] The techniques described in Patent Documents 1 and 2 have room for improvement in terms of the scope of application of authenticity determination.

[0005] The present invention provides a technique for expanding the scope of application of authenticity determination. [Means for solving the problem]

[0006] That is, the present invention includes the following aspects. [1] A transparent substrate; a thin line pattern formed on one surface of the transparent substrate; a light-scattering layer having a total light transmittance of 70% or more and a haze of 80% or more, and covering the thin line pattern; A counterfeit prevention laminate comprising: [2] The anti-counterfeit laminate according to [1], wherein the light-scattering layer has adhesive properties. [3] The anti-counterfeit laminate according to [1] or [2], further comprising an adhesive layer covering the light scattering layer. [4] The anti-counterfeit laminate according to any one of [1] to [3], wherein the transparent substrate has a total light transmittance of 50% or more. [5] The anti-counterfeit laminate according to any one of [1] to [4], wherein the transparent substrate has a thickness of 10 μm or more and 100 μm or less. [6] An adherend; The counterfeit prevention laminate according to any one of [1] to [5], which is placed on the adherend; A counterfeit prevention laminate accessory comprising: [7] The anti-counterfeit laminate accessory according to [6], wherein the anti-counterfeit laminate and the adherend are fixed via the light scattering layer. [8] The method includes a step of fixing the anti-counterfeit laminate according to any one of [1] to [5] to an adherend, The method for producing an accessory to an anti-counterfeit laminate, wherein the anti-counterfeit laminate and the adherend are fixed together via the light-scattering layer. [Effects of the Invention]

[0007] According to the present invention, it is possible to provide a technique for expanding the scope of application of authenticity determination. [Brief explanation of the drawings]

[0008] [Figure 1]1 is a perspective view showing an example of a usage mode in which an authenticity determination device is used with the counterfeit prevention laminate of this embodiment. FIG. [Figure 2] 1 is a perspective view of the anti-counterfeit laminate of the present embodiment as viewed from the transparent substrate side. [Figure 3] 1 is a cross-sectional view of the anti-counterfeit laminate of the present embodiment attached to an adherend. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0009] Hereinafter, an embodiment of the present invention (hereinafter referred to as "the present embodiment") will be described in detail with reference to the drawings as necessary, but the present invention is not limited to this, and various modifications are possible without departing from the spirit of the present invention. In the drawings, the same elements are given the same reference numerals, and redundant explanations will be omitted. Furthermore, positional relationships such as up, down, left, and right will be based on the positional relationships shown in the drawings unless otherwise specified. Furthermore, the dimensional ratios of the drawings are not limited to those shown in the drawings.

[0010] 1. Anti-counterfeit laminate The anti-counterfeit laminate of this embodiment comprises a transparent substrate, a fine line pattern formed on one surface of the transparent substrate, and a light-scattering layer that has a total light transmittance of 70% or more and a haze of 80% or more and covers the fine line pattern.

[0011] Before describing the details of the anti-counterfeit laminate, the configuration of an authenticity determination method that can be applied in this embodiment and an authenticity determination device that can execute this method will be described. FIG. 1 is a perspective view showing an example of how an authenticity determination device 200 is used. As shown in FIG. 1, the authenticity determination device 200 includes, for example, an irradiation device 210 that irradiates light onto the anti-counterfeit laminate 100, a light receiving device 220 that receives light reflected from the anti-counterfeit laminate 100, and a determination unit 230 that performs authenticity determination based on the reflected light. In the example shown in FIG. 1, the irradiation device 210 and the light receiving device 220 are arranged in approximately the same position.

[0012] Next, the configuration of the anti-counterfeit laminate 100 of this embodiment will be described. Fig. 2 shows a perspective view of the anti-counterfeit laminate 100. As shown in Fig. 2, the anti-counterfeit laminate 100 of this embodiment includes a transparent substrate 10, a fine line pattern 20 formed on one surface 10b of the transparent substrate 10, and a light diffusion layer 30 that covers the fine line pattern 20.

[0013] The anti-counterfeit laminate 100 of this embodiment can be attached to an adherend 300 and used like a label for authentic products (hereinafter, this mode of use will also be referred to as a "sticker type"). The anti-counterfeit laminate 100 of this embodiment can also be used independently like a tag to be attached to authentic products.

[0014] Fig. 3 shows a cross-sectional view of the anti-counterfeit laminate 100 of this embodiment when attached to an adherend 300 for use. The anti-counterfeit laminate 100 in Fig. 3 is used as a sticker-type anti-counterfeit laminate. As shown in Fig. 3, the anti-counterfeit laminate 100 of this embodiment can be used by being attached to the surface of the adherend 300 via a light diffusion layer 30. In this case, the fine line pattern 20 is located between the transparent substrate 10 and the surface of the adherend 300. The transparent substrate 10 located on the outermost surface also functions as a protective layer that covers the fine line pattern 20.

[0015] Light irradiated from the irradiation device 210 of the authenticity determination device 200 is incident on the anti-counterfeit laminate 100 from the transparent substrate 10 side. In the example of FIG. 3 , the incident light incident on the anti-counterfeit laminate 100 from the transparent substrate 10 side is transmitted from surface 10a to surface 10b of the transparent substrate 10, and reaches the fine line pattern 20 and the light diffusion layer 30. A portion of the incident light is reflected, and the reflected light is affected by the fine line pattern 20. For example, if the fine line pattern 20 acts like a diffraction grating, the reflected light may be diffracted light. In the anti-counterfeit laminate 100 of this embodiment, the fine line pattern 20 arranged on the transparent substrate 10 ensures accuracy in authenticity determination.

[0016] The seal-type anti-counterfeit laminate 100 in the example of FIG. 3 can be used not only for authenticity determination, but also for convenience in the distribution process of the adherend 300, since the surface of the adherend 300 can be visually confirmed through the seal-type anti-counterfeit laminate 100. However, light incident on the anti-counterfeit laminate 100 that reaches the adherend 300 tends to be irrelevant to the determination (noise light) due to the influence of the adherend 300's inherent surface texture (degree of unevenness), color, reflectance, etc. In the anti-counterfeit laminate 100 of this embodiment, the high haze of the light diffusion layer 30 promotes light diffusion of the noise light, allowing the noise light to escape outside the determination lens 240, thereby ensuring visibility. Thus, the anti-counterfeit laminate 100 of this embodiment, when used as a seal-type anti-counterfeit laminate, can be suitably used for authenticity determination, especially in applications where ensuring visibility of the adherend is advantageous. Such applications include, but are not limited to, materials with strong reflective light, such as materials with metallic luster (typically, gold paper, materials with aluminum vapor deposition surfaces, etc.).

[0017] 1.1.Transparent base material In this embodiment, a transparent substrate is used as the substrate onto which incident light is incident, as shown in Figure 1. Note that "transparent" means that the total light transmittance is 50% or more.

[0018] The material for the transparent substrate is not particularly limited, but examples thereof include transparent inorganic substrates such as glass; and transparent organic substrates such as acrylic acid esters, methacrylic acid esters, polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, polycarbonate, polyarylate, polyvinyl chloride, polyethylene, polypropylene, polystyrene, nylon, aromatic polyamide, polyether ether ketone, polysulfone, polyethersulfone, polyimide, and polyetherimide.

[0019] Among these, polyethylene terephthalate, polyimide, or polyethylene naphthalate is preferred. The use of polyethylene terephthalate tends to improve the productivity and cost reduction effect for producing the anti-counterfeit laminate, and also tends to further improve the adhesion between the transparent substrate and the thin wire. In addition, the use of polyimide tends to further improve the heat resistance of the anti-counterfeit laminate. Furthermore, the use of polyethylene naphthalate tends to further improve the adhesion between the transparent substrate and the thin wire.

[0020] The transparent substrate may be made of one material or may be a laminate of two or more materials. When the transparent substrate is a multilayer body made of two or more materials, the transparent substrate may be a laminate of organic or inorganic substrates, or a laminate of an organic substrate and an inorganic substrate.

[0021] The total light transmittance of the transparent substrate is preferably 50% or more, 60% or more, 70% or more, 80% or more, or 85% or more. A total light transmittance of 50% or more tends to further improve the reflected light intensity and improve the readability of the reflected light. In addition, the thickness when attached to the adherend is thin, and the design of the adherend is less likely to be impaired. The upper limit of the total light transmittance of the transparent substrate is not particularly limited, but may be 100% or less, or 99% or less. The total light transmittance can be measured in accordance with JIS K 7361-1:1997.

[0022] The thickness of the transparent substrate is not particularly limited and may be 5 μm or more and 500 μm or less, or 7.5 μm or more and 250 μm or less. The thickness of the transparent substrate is preferably 10 μm or more and 100 μm or less, more preferably 15 μm or more and 75 μm or less. When the thickness of the transparent substrate is 5 μm or more, the rigidity of the anti-counterfeit laminate is further improved, and minute deformation due to external factors such as lamination or expansion and contraction over time, and the accompanying scattering of light, are easily suppressed, which tends to further improve the reading efficiency. Furthermore, when the thickness of the transparent substrate is 500 μm or less, the absorption and scattering of light by the transparent substrate are more easily suppressed, which tends to further improve the reading efficiency. Furthermore, the thickness when laminated to the adherend is thin, which is less likely to impair the design of the adherend.

[0023] 1.2. Thin line pattern The thin line pattern is any pattern composed of thin lines, and may be a grid pattern (mesh pattern) of triangles, squares, hexagons, etc., or a line pattern. The thin lines are not limited to straight lines, but may be curved or wavy lines. The thin line pattern is preferably formed as a periodic pattern of thin lines. This allows the thin line pattern to form a diffraction grating, and by irradiating light, a diffraction image reflecting the fine structure can be obtained.

[0024] When a predetermined light is irradiated onto such a thin line pattern from an irradiation device, the thin line pattern reflects a predetermined reflected light. Here, the thin line pattern may act like a diffraction grating, and the reflected light may be diffracted light. For example, if the thin line pattern includes multiple thin lines with a line width of 5 μm or less, arranged at equal intervals with a periodic pitch of approximately several hundred μm, a diffraction image is observed in the reflected light, and the optical image includes such a diffraction image. In this case, the generated diffraction image may include a diffraction spot image or a diffraction stripe pattern.

[0025] Furthermore, if the fine line pattern is composed of multiple fine lines with a line width of 5 μm or less and arranged at equal intervals with a pitch of about several hundred μm, the individual fine lines are invisible and the fine line pattern is transparent, so that even if the anti-counterfeit laminate is attached to an adherend, the design and posted information are not impaired.

[0026] The thin wires may be made of a material having a total light transmittance of less than 50%. The thin wires may contain non-metallic materials, but are preferably thin wires containing metals. Examples of metals include, but are not limited to, gold, silver, copper, and aluminum. Among these, silver or copper is preferred, and copper is more preferred. Furthermore, the thin wires do not need to be electrically conductive, and the thin wire pattern does not need to ensure electrical conductivity at any two points on the pattern.

[0027] From the above viewpoints, it is preferable that the thin lines are difficult to see with the naked eye due to their thinness. For example, the line width of the thin lines is preferably 5.0 μm or less, 0.1 to 5.0 μm, or 0.3 to 5.0 μm. A line width of 5.0 μm or less reduces the visibility of the thin lines. This allows a thin line pattern to be applied without compromising the design of the adherend. Furthermore, such thin lines with low visibility are difficult to manufacture, and this also contributes to ensuring that they are difficult to replicate. Here, the line width in this embodiment refers to the line width of the thin lines when projected onto the surface of the transparent substrate from the side of the transparent substrate on which the thin lines are arranged.

[0028] The pitch between the fine lines in a predetermined direction is preferably 1.0 to 1000 μm, 5.0 to 500 μm, 50 to 250 μm, or 100 to 250 μm. When the pitch is 1.0 μm or more, the visibility of the fine lines decreases. This allows the fine line pattern to be applied without impairing the design of the adherend. Furthermore, when the pitch is 1000 μm or less, the influence of the fine line pattern is more easily reflected in the reflected light, which tends to further improve reading efficiency.

[0029] The aperture ratio, which is the ratio of the area of ​​the portion of the fine line pattern having no fine lines formed therein, of a predetermined area is preferably 80 to 99.9 area%, 85 to 99.8 area%, 90 to 99.6 area%, or 95 to 99.5 area%. The aperture ratio OR can also be expressed as transmittance. This prevents the fine line pattern from impairing the design of the adherend or the information displayed. When the fine line pattern has a mesh pattern shape, a fine line pattern with a line width of 1 μm and a pitch of 200 μm can achieve an aperture ratio of 99%.

[0030] The total light transmittance of the entire thin line pattern, including areas where thin lines are not formed, is preferably 75 to 99%, 80 to 98%, or 85 to 98%. The total light transmittance can be measured in accordance with JIS K 7361-1:1997.

[0031] 1.3.Light Diffusion Layer The light diffusion layer is not particularly limited as long as it has a total light transmittance of 70% or more and a haze of 80% or more. The light diffusion layer may be, for example, one that can exhibit good adhesion to a conductive sheet or a substrate. In this embodiment, the light diffusion layer may be a layer containing a transparent resin such as an acrylic polymer, or may be a layer containing a transparent resin such as an acrylic polymer as a main component (50% by mass or more) and oxide fine particles as an additive. The light diffusion layer may be a single layer or may have multiple layers.

[0032] The total light transmittance of the light diffusion layer is preferably 50% or more, more preferably 80% or more, from the viewpoint of further improving the visibility of the adherend. The total light transmittance of the light diffusion layer can be measured based on the method described in the examples below.

[0033] The haze of the light diffusion layer is preferably 60% or more, more preferably 80% or more, from the viewpoint of further improving the visibility of the adherend. The haze of the light diffusion layer can be measured by the method described in the examples below.

[0034] The total light transmittance and haze of the light diffusion layer can be adjusted to the above-mentioned ranges by, for example, blending a transparent resin material such as an acrylic polymer with a light-diffusing material such as oxide fine particles to form a layer. Examples of oxide fine particles include, but are not limited to, oxide fine particles such as SiO2, ZrO, ZnO, and TiO2. For example, using an acrylic polymer as the material constituting the light diffusion layer tends to ensure high total light transmittance, while reducing the particle size of the oxide fine particles added to the acrylic polymer or increasing the amount added tends to ensure high haze (high light diffusion effect).

[0035] For convenience in use as a seal-type film, the light diffusion layer preferably has adhesive properties. Materials constituting the adhesive light diffusion layer are not particularly limited, but examples thereof include adhesive resins. Examples of adhesive resins include, but are not limited to, acrylic resins, urethane resins, polyisobutylene resins, olefin resins, acrylic urethane resins, and polyester resins. Other examples of adhesive light diffusion layers include thermosetting resins such as phenolic resins, thermosetting epoxy resins, thermosetting polyimides, melamine resins, urea resins, unsaturated polyester resins, alkyd resins, polyurethanes, diallyl phthalate resins, and silicone resins; UV-curable resins such as urethane acrylates, acrylic resin acrylates, epoxy acrylates, silicone acrylates, and UV-curable epoxy resins; thermoplastic resins such as polyolefins and polyesters; commercially available coating agents; rubber-based adhesives such as polyisoprene and polyisoprene-butylene; acrylic adhesives; and silicone adhesives.

[0036] The thickness of the light diffusion layer is not particularly limited and may be 1.0 μm or more and 500 μm or less, 10 μm or more and 250 μm or less, or 25 μm or more and 150 μm or less. When the thickness of the light diffusion layer is 5 μm or more, adhesion to the adherend tends to be further improved. Furthermore, when the thickness of the light diffusion layer is 500 μm or less, reading efficiency tends to be further improved. Furthermore, when attached to the adherend, the thickness is thin, and the design of the adherend is less likely to be impaired.

[0037] 1.4. Adhesive layer The anti-counterfeit laminate may further include an adhesive layer covering the light diffusion layer. The adhesive layer is a layer different from the light diffusion layer (does not satisfy the total light transmittance of 70% or more and the haze of 80% or more) and is not particularly limited as long as it has adhesive properties. The adhesive layer may be, for example, transparent and capable of exhibiting good adhesion to the conductive sheet or substrate. The adhesive layer may be a single layer or may have multiple layers.

[0038] The adhesive resin constituting such an adhesive layer is not particularly limited, and examples thereof include acrylic resins, urethane resins, polyisobutylene resins, olefin resins, acrylic urethane resins, and polyester resins. Other examples of the adhesive layer include thermosetting resins such as phenolic resins, thermosetting epoxy resins, thermosetting polyimides, melamine resins, urea resins, unsaturated polyester resins, alkyd resins, polyurethanes, diallyl phthalate resins, and silicone resins; UV-curable resins such as urethane acrylates, acrylic resin acrylates, epoxy acrylates, silicone acrylates, and UV-curable epoxy resins; thermoplastic resins such as polyolefins and polyesters; commercially available coating agents; rubber-based adhesives such as polyisoprene and polyisoprene-butylene; acrylic adhesives; and silicone adhesives.

[0039] The thickness of the adhesive layer is not particularly limited and may be 1.0 μm or more and 500 μm or less, 10 μm or more and 250 μm or less, or 25 μm or more and 150 μm or less. When the thickness of the adhesive layer is 5 μm or more, adhesion to the adherend tends to be improved. Furthermore, when the thickness of the adhesive layer is 500 μm or less, reading efficiency tends to be improved. Furthermore, the thickness when attached to the adherend is thin, which is less likely to impair the design of the adherend.

[0040] 2. Manufacturing method of anti-counterfeit laminate The method for producing the anti-counterfeit laminate of this embodiment may include a pattern forming step of forming a fine line pattern on a transparent substrate, and a light diffusion layer forming step of forming a light diffusion layer so as to cover the fine line pattern.

[0041] The method for forming the fine line pattern in the pattern formation step is not particularly limited, and for example, the fine line pattern may be formed on the transparent substrate by various printing methods. More specifically, an ink containing metal particles may be printed on the transparent substrate by letterpress printing, gravure printing, bar coating printing, spray coating, spin coating, reverse transfer printing, or the like, and then baked to form the fine line pattern containing metal.

[0042] Furthermore, in the light diffusion layer formation step, although not particularly limited, for example, the light diffusion layer may be formed by applying a resin composition so as to cover the fine line pattern, or the light diffusion layer may be formed by attaching double-sided tape so as to cover the fine line pattern.

[0043] 3. Anti-counterfeit laminate accessories The anti-counterfeit laminate accessory of this embodiment includes an adherend and the above-mentioned anti-counterfeit laminate disposed on the adherend. The adherend may be the product itself or the product packaging.

[0044] The contact surface of the anti-counterfeit laminate with the adherend is preferably the surface of the light-diffusing layer. More specifically, the anti-counterfeit laminate and the adherend are preferably fixed via the light-scattering layer. In this case, visibility of the adherend tends to be ensured in addition to the ability to determine authenticity.

[0045] 4. Manufacturing method of anti-counterfeit laminate accessory The method for manufacturing an anti-counterfeit laminate accessory of this embodiment includes a fixing step of fixing the anti-counterfeit laminate to an adherend. Here, the contact surface of the anti-counterfeit laminate with the adherend is preferably the surface of the light diffusion layer. More specifically, it is preferable that the anti-counterfeit laminate and the adherend are fixed via the light scattering layer. In this case, visibility of the adherend tends to be ensured in addition to the ability to determine authenticity.

[0046] The fixing method in the fixing step is not particularly limited, but examples thereof include a method in which, when the light diffusion layer of the anti-counterfeit laminate has adhesive properties, the anti-counterfeit laminate is attached to the adherend via the light diffusion layer. When the light diffusion layer of the anti-counterfeit laminate does not have adhesive properties, the anti-counterfeit laminate may be attached to the adherend via an adhesive layer covering the light diffusion layer. [Example]

[0047] The present embodiment will be described in more detail below using examples and comparative examples, but the present embodiment is not limited to the following examples.

[0048] Example 1 20 parts by mass of cuprous oxide nanoparticles with a primary particle size of 21 nm, 4 parts by mass of a dispersant (manufactured by BYK-Chemie, product name: Disperbyk-145), 1 part by mass of a surfactant (manufactured by AGC Seimi Chemical Co., Ltd., product name: S-611), and 75 parts by mass of ethanol were mixed to prepare an ink containing 20% ​​by mass of cuprous oxide nanoparticles.

[0049] Cosmoshine (Toyobo Co., Ltd., product name: A4160, single-sided easy-adhesion type, thickness: 50 μm, total light transmittance: 89.3%) was prepared as a substrate. The ink prepared as described above was printed on the easy-adhesion surface to form the desired fine line pattern. Specifically, the ink was first applied to the surface of a blanket. Then, the ink-coated blanket surface was brought into contact with a plate with grooves for the fine line pattern, transferring some of the ink on the blanket surface to the raised surfaces of the plate. The remaining ink-coated blanket surface was then brought into contact with the substrate, transferring the ink in the fine line pattern onto the substrate. The fine line pattern had a line width of 3 μm and a pitch of 60 μm. Plasma was generated from the ink in the fine line pattern obtained as described above using microwaves generated at an output of 0.9 kW in an atmosphere with a water molecule partial pressure of 100 Pa under reduced pressure. The plasma and ink were allowed to react for 180 seconds to form a fine line pattern consisting of fine metal lines.

[0050] Adhesive tape 1 ("MK-64" manufactured by Tomoegawa Corporation; thickness: 50 μm) was prepared as a raw material for further forming layer A on the fine line pattern formed as described above. One release film of adhesive tape 1 was peeled off, and the exposed adhesive surface was attached to the fine line pattern. A roller was then moved back and forth twice from above with a pressure of 2 N to form layer A, thereby obtaining an anti-counterfeit laminate.

[0051] Comparative Example 1 An anti-counterfeit laminate was obtained in the same manner as in Example 1, except that adhesive tape 2 (DAITAC FRT30 manufactured by DIC Corporation; thickness: 30 μm) was used instead of adhesive tape 1.

[0052] Comparative Example 2 An anti-counterfeit laminate was obtained in the same manner as in Example 1, except that adhesive tape 3 ("TD-06" manufactured by Tomoegawa Corporation; thickness 25 μm) was used instead of adhesive tape 1.

[0053] Comparative Example 3 An anti-counterfeit laminate was obtained in the same manner as in Example 1, except that instead of adhesive tape 1, adhesive tape 3, adhesive tape 4 ("Window Film 18T" manufactured by Oike Kogyo Co., Ltd.; thickness 50 μm), and adhesive tape 3 were laminated in this order.

[0054] [Total light transmittance] The total light transmittance of Layer A in each anti-counterfeit laminate was measured using a haze meter (NDH-7000) manufactured by Nippon Denshoku Industries Co., Ltd. The measurement was carried out in accordance with JIS K 7361-1:1997. The results are shown in Table 1.

[0055] [Hayes] The haze of Layer A in each anti-counterfeit laminate was measured using a haze meter (NDH-7000) manufactured by Nippon Denshoku Industries Co., Ltd. The measurement was carried out in accordance with JIS K 7361-1:1997. The results are shown in Table 1.

[0056] [Reading efficiency] The Layer A side of each anti-counterfeit laminate was attached to gold paper (Specialties No. 318-256 (25μ PET Gold) manufactured by Gojo Paper Co., Ltd.) to create each anti-counterfeit laminate accessory. When attempting to obtain diffracted light for each anti-counterfeit laminate accessory, if diffracted light that was blurred or otherwise unreadable was obtained three or more times out of ten, it was evaluated as x, and if diffracted light that was unreadable two or less times out of ten, it was evaluated as o.

[0057] [Text visibility] The character visibility of each of the anti-counterfeit laminate accessories prepared in the above [Reading Efficiency] was evaluated as follows. First, under standard indoor lighting conditions (illuminance 800 lux), each anti-counterfeit laminate accessory was placed so that the transparent substrate side of the anti-counterfeit laminate accessory was the observation surface. Next, the positional relationship between the observer, who was 100 cm away from the anti-counterfeit laminate accessory, and the anti-counterfeit laminate accessory was appropriately adjusted so that the angle formed between the observer's eye position, the center of the observation surface, and the observation surface was 30 degrees, 60 degrees, or 90 degrees. That is, the legibility of the characters (5 mm characters) written on the surface of the gold paper was evaluated from each of the above angles. If the characters were legible at each angle, they were evaluated as ◯, and if they were illegible, they were evaluated as ×. Each anti-counterfeit laminate accessory was evaluated by three observers. If all observers rated the character as ◯, it was determined that "character visibility was present" at that angle. Finally, the anti-counterfeit laminate accessories that were judged to have "character visibility" at all angles were evaluated as having excellent character visibility.

[0058] [Table 1] [Industrial Applicability]

[0059] The present invention has industrial applicability as a counterfeit prevention laminate that can be attached to an adherend and used as a seal, tag, or the like to prevent counterfeiting. [Explanation of symbols]

[0060] 10...transparent substrate, 10a...surface, 10b...surface, 20...thin line pattern, 30...light diffusion layer, 100...counterfeit prevention laminate, 200...authenticity determination device, 210...irradiation device, 220...light receiving device, 230...determination unit, 240...determination unit lens, 300...adherend

Claims

1. A transparent substrate; a thin line pattern formed on one surface of the transparent substrate; a light-scattering layer having a total light transmittance of 70% or more and a haze of 80% or more, and covering the thin line pattern; A counterfeit prevention laminate comprising:

2. The counterfeit prevention laminate according to claim 1 , wherein the light scattering layer has adhesive properties.

3. The counterfeit prevention laminate according to claim 1 , further comprising an adhesive layer covering the light scattering layer.

4. 2. The anti-counterfeit laminate according to claim 1, wherein the transparent substrate has a total light transmittance of 50% or more.

5. 2. The counterfeit prevention laminate according to claim 1, wherein the transparent substrate has a thickness of 10 μm or more and 100 μm or less.

6. An adherend; The counterfeit prevention laminate according to any one of claims 1 to 5, which is placed on the adherend; A counterfeit prevention laminate accessory comprising:

7. 7. The anti-counterfeit laminate accessory according to claim 6, wherein the anti-counterfeit laminate and the adherend are fixed together via the light scattering layer.

8. The method includes a step of fixing the anti-counterfeit laminate according to any one of claims 1 to 5 to an adherend, The method for producing an accessory to an anti-counterfeit laminate, wherein the anti-counterfeit laminate and the adherend are fixed together via the light-scattering layer.

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