Printed laminate and method for manufacturing the same

Abstract

This invention provides a printed laminate that allows two different colors to be visually observed using a simple printing method, without the need for special equipment for observation or light sources. [Solution] The printed laminates 1 and 1A have a transparent substrate 2 and colored ink printing layers 3 and 3A on the transparent substrate 2. The colored ink printing layers 3 and 3A contain a binder resin, a highly scattering red pigment, and a low scattering blue pigment, with the mass ratio of the blue pigment to the red pigment being in the range of 0.20 to 0.60. The total amount of red and blue pigment contained in the colored ink printing layers 3 and 3A is 0.3 to 0.9 g / m². 2 It is within the range.

Description

[Technical Field]

[0001] The present invention relates to a printed laminate and a method for manufacturing the same. [Background technology]

[0002] Printed laminates coated with colored inks are widely used in various applications, including packaging for food, pharmaceuticals, and daily necessities, as well as for decorating plastic molded products. By printing or coating with colored inks, it is possible to not only transmit information but also to add aesthetic appeal and prevent counterfeiting.

[0003] In particular, printed laminates that exhibit dichroism—the property that the observed color differs distinctly depending on conditions such as angle and light source—can be used for purposes such as preventing counterfeiting and adding eye-catching appeal.

[0004] As a method for obtaining a printed laminate having dichroism, for example, Patent Document 1 discloses a dichroic printed material using an ink containing a pearl pigment having iridescent color. Patent Document 2 discloses an anti-counterfeiting medium in which different colors are observed according to the density gradient of the laminated ink layers when a first observation light and a second observation light are reflected and transmitted, respectively. Patent Document 3 discloses a method of printing by incorporating a colored resin molded product containing a highly scattering colorant, a low scattering colorant, and a binder resin into the ink. [Prior art documents] [Patent Documents]

[0005] [Patent Document 1] Japanese Patent Application Publication No. 6-255234 [Patent Document 2] Japanese Patent Publication No. 2023-178857 [Patent Document 3] Patent No. 7496467 [Overview of the project] [Problems that the invention aims to solve]

[0006] However, the dichroic printed material described in Patent Document 1 is limited to designs with a pearlescent appearance because it uses pearl pigments. The dichroic printed material described in Patent Document 2 requires identification using two different light sources, and furthermore, the coloring materials used have not been sufficiently considered.

[0007] Furthermore, since Patent Document 3 concerns a method for coloring colored resin molded products, it describes inks containing colored resin molded products, but does not consider the formation of a colored ink layer by actual printing processes.

[0008] The object of the present invention is to provide a printed laminate that allows two different colors to be visually observed by a simple printing method without the need for special equipment for observation or light sources, and a method for manufacturing the same. [Means for solving the problem]

[0009] The present invention relates to a printed laminate having a transparent substrate and a colored ink printing layer on the transparent substrate, The colored ink printing layer contains a binder resin, a highly scattering red pigment, and a low scattering blue pigment, the mass ratio of the blue pigment to the red pigment is in the range of 0.20 to 0.60, and the total amount of the red pigment and blue pigment contained in the colored ink printing layer is 0.3 to 0.9 g / m². 2 This relates to a printed laminate characterized by being within the specified range.

[0010] Furthermore, the present invention relates to a method for producing a printed laminate having a transparent substrate and a colored ink printing layer on the transparent substrate, A colored ink containing a binder resin, a highly scattering red pigment, and a low scattering blue pigment is printed onto a transparent substrate to form the colored ink printing layer. In this process, the mass ratio of the blue pigment to the red pigment in the colored ink printing layer is set to a range of 0.20 to 0.60, and the total amount of the red and blue pigments contained in the colored ink printing layer is set to 0.3 to 0.9 g / m². 2 It is characterized by being within the range of [a specific range].

[0011] Furthermore, the present invention relates to a method for producing a printed laminate comprising a transparent substrate and a colored ink printing layer on the transparent substrate, wherein the colored ink printing layer comprises a first printing layer containing a binder resin and a low-scattering blue pigment, and a second printing layer containing a binder resin and a high-scattering red pigment. The first printed layer is formed by printing a first colored ink containing the binder resin and the low-scattering blue pigment, and the second printed layer is formed by printing a second colored ink containing the binder resin and the high-scattering red pigment, wherein the mass ratio of the blue pigment to the red pigment in the colored ink printed layer is in the range of 0.20 to 0.60, and the total amount of the red pigment and the blue pigment contained in the colored ink printed layer is 0.3 to 0.9 g / m². 2 It is characterized by being within the range of [a specific range]. [Effects of the Invention]

[0012] According to the present invention, it is possible to provide a printed laminate that allows two different colors to be visually observed by a simple printing method without using special equipment for observation or light sources, and a method for manufacturing the same.

[0013] Such printed laminates are suitable as printed materials for visual authentication to prevent counterfeiting. Furthermore, by installing the printed laminate of the present invention on a display panel, which is generally black when not in operation, it is possible to obtain an article that exhibits dichroism depending on whether the display's backlight is turned on or off. [Brief explanation of the drawing]

[0014] [Figure 1] (a) shows a printed laminate 1 having a colored ink printing layer 3, and (b) shows a printed laminate 1A having a colored ink printing layer 3A composed of a first printing layer 4 and a second printing layer 5. [Figure 2] (a) shows a printed laminate 1B having a colored ink printing layer 3B composed of a first printing layer 4 and a second printing layer 5, and (b) shows a printed laminate 1C in which the first printing layer 4 is provided on the first main surface of a transparent substrate and the second printing layer 5 is provided on the second main surface. [Figure 3] It is a schematic diagram showing a color measurement method of a test piece.

Embodiments for Carrying Out the Invention

[0015] Hereinafter, the present invention will be described in detail. The following embodiments are merely illustrative for explaining the present invention, and it is not intended to limit the present invention only to these embodiments. The present invention can be implemented in various modes without departing from its gist.

[0016] (Transparent substrate) The "transparent substrate" is a substrate made of a material with little reflection or absorption of visible light and that transmits visible light without diffusion inside. Such materials include transparent resin, transparent glass, and the like.

[0017] As the transparent resin, a thermoplastic resin is preferred. Examples of such thermoplastic resins include polyolefin resins such as polyethylene and polypropylene; polyester resins such as polyethylene terephthalate and polybutylene terephthalate; polycarbonate; polystyrene; ABS; polyamide; polymethyl methacrylate; polyurethane; and polyphenylene ether. In addition to thermoplastic resins, the transparent resin may also be a thermosetting resin. Examples of thermosetting resins may be conventionally known thermosetting resins such as urethane resins, epoxy resins, phenolic resins, unsaturated polyester resins, vinyl ester resins, alkyd resins, melamine resins, imide resins, styrene resins obtained by polymerizing monomers having two or more vinyl polymerizable functional groups, and (meth)acrylate resins.

[0018] (Colored ink printing layer) The colored ink printing layer contains a binder resin, a highly scattering red pigment, and a low scattering blue pigment. The mass ratio of the blue pigment to the red pigment is in the range of 0.20 to 0.60, and the total amount of red and blue pigment contained in the colored ink printing layer is 0.3 to 0.9 g / m². 2 It is within the range.

[0019] In a preferred embodiment, the colored ink printing layer comprises a printing layer containing a binder resin, a highly scattering red pigment, and a low scattering blue pigment. For example, the printed laminate 1 in Figure 1(a) comprises a transparent substrate 2 and a colored ink printing layer 3 on the first main surface 2a of the transparent substrate 2. In this case, the second main surface 2b of the transparent substrate 2 may be the observation surface A, and the surface of the colored ink printing layer 3 may be the observation surface A. The colored ink printing layer 3 comprises a single-layer printing layer containing a binder resin, a highly scattering red pigment, and a low scattering blue pigment.

[0020] In a preferred embodiment, a first printed layer is provided on the first main surface of a transparent substrate, a second printed layer is provided on the first printed layer, and the surface of the second printed layer is the observation surface. For example, in the printed laminate 1A of Figure 1(b), a first printed layer 4 containing a blue pigment is provided on the first main surface 2a of the transparent substrate 2, and a second printed layer 5 containing a red pigment is provided on the first printed layer 4, forming a colored ink printed layer 3A. The surface 5a of the second printed layer 5 is designated as the observation surface A. In this case, dichroism is more favorably expressed when viewed from the surface 5a side of the second printed layer 5 than when viewed from the second main surface 2b side of the transparent substrate 2.

[0021] In a preferred embodiment, a second printed layer is provided on the first main surface of a transparent substrate, and a first printed layer is provided on the second printed layer, with the second main surface of the transparent substrate, opposite to the first main surface, being the observation surface. For example, in the printed laminate 1B of Figure 2(a), a second printed layer 5 containing a red pigment is provided on the first main surface 2a of the transparent substrate 2, and a first printed layer 4 containing a blue pigment is provided on the first printed layer 5, forming a colored ink printed layer 3B. The second main surface 2b of the transparent substrate 2 is designated as the observation surface A. In this case, dichroism is more favorably expressed when viewed from the second main surface 2b side of the transparent substrate 2 than when viewed from the first printed layer 4 side.

[0022] Furthermore, the first and second printed layers may be in direct contact with each other, but they may also be separated from each other. For example, in a preferred embodiment, the first printed layer is provided on the first main surface of the transparent substrate, and the second printed layer is provided on the second main surface of the transparent substrate opposite to the first main surface, with the surface of the second printed layer being the observation surface.

[0023] For example, in the printed laminate 1C shown in Figure 2(b), a first printed layer 4 containing blue pigment is provided on the first main surface 2a of the transparent substrate 2, and a second printed layer 5 containing red pigment is provided on the second main surface 2b of the transparent substrate 2, which is opposite to the first main surface 2a, with the surface 5a of the second printed layer 5 being the observation surface A. The first and second printed layers together constitute the colored ink printed layer 3C. In this case, dichroism is more favorably expressed when viewed from the second printed layer 5 side than when viewed from the first printed layer 4 side.

[0024] (Binder resin) The binder resin contained in the colored ink printing layer is not particularly limited and can be appropriately selected from binder resins used to manufacture general printing inks. Examples of binder resins include (meth)acrylic resins, polyurethane resins, cellulose resins, vinyl chloride-vinyl acetate resins, polyester resins, polyolefin resins, and polyvinyl acetal resins. These binder resins may be used individually or in combination of two or more types.

[0025] (Low-scattering blue pigment and high-scattering red pigment) A red pigment means that its hue angle (hab:CIE1976a,b hue-angle) in a 10° field of view using a D65 light source is between 0° and 70°. The hue angle of the red pigment is more preferably 55° or less, and even more preferably 5° or more.

[0026] Furthermore, a blue pigment means that the hue angle (hab:CIE1976a,b hue-angle) in a 10° field of view using a D65 light source is between 200° and 290°. The hue angle of the blue colorant is more preferably 225° or higher, and even more preferably 315° or lower. In addition, white and black undercoats are not used when measuring the hue angle of each pigment.

[0027] The red pigment used in this invention is highly scattering, and the blue pigment is low scattering. These scattering properties are measured by kneading each pigment into a transparent resin and measuring the resulting molded resin product. Specifically, in the case of a blue pigment with low scattering properties, increasing the concentration of the blue pigment until light no longer penetrates the molded resin product will decrease the brightness of the product. This is because the blue pigment has low scattering properties, resulting in less scattering of light rays. Therefore, in order to prevent light from penetrating the molded resin product, the concentration of the blue pigment must be increased. As a result, the concentration of the blue pigment increases, which lowers the brightness of the colored molded resin product at that point. On the other hand, in the case of a red pigment with high scattering properties, even if the concentration of the red pigment is increased until light no longer penetrates the molded resin product, the brightness of the product remains relatively high. This is because high scattering properties of the colorant make it difficult for light to penetrate even at relatively low concentrations of red pigment. Therefore, the brightness remains relatively high even at the stage where light no longer penetrates the molded resin product.

[0028] Specifically, the scattering properties of each pigment are measured as follows: First, each pigment is kneaded into a transparent resin (transparent flexible polyvinyl chloride resin) to create a test specimen that is not completely transparent. The thickness of the test specimen is 1 mm. Here, the total visible light transmittance of the "not completely transparent test specimen" is set to 1% or less.

[0029] In this state, the lightness (L*) of each test specimen is measured according to the CIE1976 L*a*b* color space. A red pigment with a lightness (L*) of 15 or higher is defined as "highly scattering." From a practical standpoint, the lightness (L*) of highly scattering red pigments is often 90 or lower. Similarly, a blue pigment with a lightness (L*) of 10 or lower is defined as "lowly scattering." From a practical standpoint, the lightness (L*) of lowly scattering blue pigments is often 1 or higher.

[0030] When measuring the brightness of these pigments, each pigment to be measured is mixed with a transparent, flexible polyvinyl chloride resin to create a 1 mm thick test specimen. Then, as shown in Figure 3, each test specimen (resin molded product) is placed on a Konica Minolta "CM-36dG". However, no white or black underlay is provided. The specific colorimetric conditions are a D65 light source, a field of view of 10°, LAV for illumination diameter and measurement diameter, and the SCE method for measurement.

[0031] Examples of highly scattering red pigments include red pigments such as yellowish-red and purplish-red, cadmium red, and organic pigments such as metal complex pigments.

[0032] Furthermore, examples of low-scattering blue pigments include copper phthalocyanines such as CI Pigment Blue 15, 15:1, 15:2, 15:3, 15:4, and 15:6, as well as ultramarine and cobalt blue pigments. Copper phthalocyanine pigments can be cited.

[0033] In this invention, the mass ratio of blue pigment to red pigment (mass of blue pigment / mass of red pigment) is set to a range of 0.20 to 0.60, and the total amount of red and blue pigment contained in the colored ink printing layer is set to 0.3 to 0.9 g / m². 2 The range shall be as follows. Here, the mass of each pigment refers to its mass in the entire colored ink printing layer. If the colored ink printing layer consists of a first printing layer and a second printing layer, the sum of the masses of each pigment in the entire first and second printing layers shall be measured.

[0034] By setting the mass ratio of blue pigment to red pigment (mass of blue pigment / mass of red pigment) to a range of 0.20 to 0.60, dichroism is improved and the optical density (OD value) is improved. From this viewpoint, it is even more preferable that the mass ratio of blue pigment to red pigment (mass of blue pigment / mass of red pigment) be 0.22 or higher, and even more preferable that it be 0.60 or lower.

[0035] Furthermore, the total amount of red and blue pigment contained in the colored ink printing layer is 0.3 to 0.9 g / m². 2By setting the range to this, dichroism is improved and optical density is enhanced. From this perspective, the total amount of red and blue pigment contained in the colored ink printing layer should be 0.4 g / m². 2 It is even more preferable to have the above, and also 0.7 g / m 2 The following is even more preferable.

[0036] The red pigment and the blue pigment are preferably used in a state in which they are dispersed with an average particle size of 0.1 to 1.5 μm. By setting the average particle size to 1.5 μm or less, the transparency of the ink is improved. Furthermore, by setting the average particle size to 0.1 μm or more, the stability of the ink is improved.

[0037] (Hue angle and lightness) In the present invention, when measuring the hue angle and lightness of a printed laminate in a 10° field of view using a D65 light source, it is preferable that the hue angle hW measured on a white substrate is 200° to 290° and the lightness L*W is 30 or more, and the hue angle hB measured on a black substrate is 0° to 70° and the lightness L*B is 20 or more. Furthermore, the lightness L*W measured on a white background is often 65 or less, while the lightness L*B measured on a black background is often 30 or less.

[0038] The hue angle of a printed laminate is measured as follows: Specifically, test specimens with a printing thickness of 2 μm are prepared for the printed laminate to be measured. Then, as shown in Figure 3, each test specimen is placed on a Konica Minolta "CM-36dG". A white base (EVER-WHITE9582) or a black base (EVER-BLACK0005) is placed between each test specimen and the measurement area, and color measurement is performed. The specific colorimetric conditions involve using LAV for the illumination diameter and measurement diameter, and the SCE method for measurement.

[0039] (optical density) Furthermore, the printed laminate of the present invention preferably has an optical density (OD value) in the range of 0.2 to 0.6.

[0040] (Preferred Manufacturing Method of Printed Laminate) In a preferred embodiment, an ink containing a binder resin, a highly scattering red pigment, and a low scattering blue pigment is printed on a transparent substrate to form a colored ink printed layer. At this time, the mass ratio of the blue pigment to the red pigment in the colored ink printed layer is in the range of 0.20 to 0.60, and the total amount of the red pigment and the blue pigment contained in the colored ink printed layer is 0.3 to 0.9 g / m 2 This is the case of forming a single-layer colored ink printed layer.

[0041] Also, in a preferred embodiment, a printed laminate having a transparent substrate and a colored ink printed layer on the transparent substrate is manufactured. The colored ink printed layer has a first printed layer containing a binder resin and a low scattering blue pigment, and a second printed layer containing a binder resin and a highly scattering red pigment. At this time, the first printed layer is formed by printing a first colored ink containing a binder resin and a low scattering blue pigment, and the second printed layer is formed by printing a second colored ink containing a binder resin and a highly scattering red pigment. At this time, the mass ratio of the blue pigment to the red pigment in the entire colored ink printed layer is in the range of 0.20 to 0.60, and the total amount of the red pigment and the blue pigment contained in the entire colored ink printed layer is 0.3 to 0.9 g / m 2 of the range.

[0042] Among the components of each ink, the content and ratio of the binder resin, the red pigment, and the blue pigment have been described above. The following describes other components contained in each ink.

[0043] (Solvent) As the solvent for each ink, a solvent that dissolves or disperses the above-mentioned components contained in each ink can be used. Examples of the solvent include ketone solvents, ester solvents, hydrocarbon solvents, ether solvents, alcohol solvents, and water. These solvents may be used alone or in combination of two or more.

[0044] (Mass ratio of each pigment in the ink) The proportion of the blue pigment contained in the ink is preferably 4 to 20% by mass relative to the total amount of colored ink (the sum of the first and second colored inks, if any). Setting this to 20% by mass or less improves the stability of the colored ink, while setting it to 4% by mass or more improves the coloring power of the printed layer.

[0045] The proportion of the red pigment contained in the ink is preferably 4 to 20% by mass relative to the total amount of colored ink (the sum of the first and second colored inks, if any). Setting this to 20% by mass or less improves the stability of the colored ink, while setting it to 4% by mass or more improves the coloring power of the printed layer.

[0046] (optional ingredient) Examples of optional components included in the ink include pigments, pigment derivatives, extender pigments, waxes, antiblocking agents, chlorinated polyolefins, fatty acid amides, chelating agents, curing agents, anti-settling agents, UV absorbers, antioxidants, antistatic agents, leveling agents, thickeners, defoaming agents, plasticizers, dispersants, flame retardants, and stabilizers. These optional components may be used individually or in combination of two or more.

[0047] The content of any optional components in the ink is not limited as long as it does not impair the effects of the present invention, but for example, it is preferably 0 to 10% by mass, and more preferably 0 to 5% by mass, relative to the total mass of solids in the ink.

[0048] (Manufacturing methods for each ink) The ink of the present invention can be manufactured by conventional methods.

[0049] (Method of manufacturing printed laminates) The printed laminate of the present invention can be obtained by mixing the above-mentioned inks, or by laminating them sequentially on a transparent substrate. The printing method is not particularly limited, but examples include gravure printing, flexographic printing, inkjet printing, and screen printing.

[0050] Furthermore, the application method for each colored ink is not limited, and printed laminates can be manufactured by printing methods such as gravure printing and flexographic printing, or by coating methods such as gravure coater, die coater, bar coater, spray coat, and spin coat. [Examples]

[0051] (Experiment A) (Manufacturing of each ink) Each of the inks shown in Table 1 was manufactured. Here, we manufactured first colored inks 1A, 1B, and 1C containing the blue pigment, second colored inks 2A and 2B containing the red pigment, and a transparent ink. The numerical values ​​for each ink's components represent the mass percentage of each component. The product names of each component are listed in the remarks column.

[0052] The components of the first and second colored inks were mixed and shaken for 1 hour with 1 mm diameter glass beads using a paint conditioner to obtain each colored ink. Furthermore, a transparent ink was obtained by stirring each component of the transparent ink in a disperser for 5 minutes.

[0053] (Manufacturing of printed laminates) A printed laminate 1, as shown in Figure 1(a), was manufactured. Specifically, the inks shown in Table 1 were prepared and mixed to produce the compositions of each example and comparative example shown in Table 2. Each mixed ink was then applied to the first main surface 2a of a transparent substrate 2 made of PET film (Toyobo E5102, 25 μm thick) and printed. Except for Example A5 and Comparative Example A2, each mixed ink was applied to the transparent substrate by gravure printing and printed using an etching plate. In Example A5 and Comparative Example A2, the ink was applied to the transparent substrate using a bar coater. This resulted in obtaining each printed laminate 1.

[0054] (Measurement method) Table 2 shows the film thickness of each printed layer 3 obtained, the mass ratio of the blue pigment / red pigment, and the total mass of pigments in the printed layer. The optical density (OD value) was measured using the "X-Rite 361T(V)" transmission densitometer (product name, manufactured by X-Rite Corporation). The L* value and h value were measured using the "CM-36dG" manufactured by Konica Minolta.

[0055] For the white base coat, we used EVER-WHITE9582, and for the black base coat, we used EVER-BLACK0005.

[0056] [Table 1]

[0057] [Table 2]

[0058] In Examples A1 to A9 shown in Table 2, the first colored ink and the second colored ink were mixed, and the mass ratio of the blue pigment / red pigment and the mass of the pigment in the printed layer satisfied the requirements of the present invention. As a result, the hue angle hW measured on a white substrate was 200° to 290° and the lightness L*W was 30 or higher, the hue angle hB measured on a black substrate was 0° to 70° and the lightness L*B was 20 or higher, and furthermore, the optical density was in the range of 0.2 to 0.6. Therefore, significant dichroism was exhibited while maintaining high lightness on both white and black substrates.

[0059] In contrast, in Comparative Example A1, the mass ratio of the blue pigment to the red pigment was high at 0.88, resulting in a high hue angle hB of 309.9° and a low lightness L*B of 19.3 on a black background.

[0060] In Comparative Example A2, the total amount of pigment in the printing layer 3 was 1.34 g / m². 2 Because of the high density, the optical density was high at 0.73, the lightness L*B on a black background was low at 19.5, and the lightness L*W on a white background was also low at 27.3.

[0061] In Comparative Example A3, the mass ratio of the blue pigment to the red pigment was low at 0.18, resulting in a high hue angle hW of 296.3° on a white substrate.

[0062] (Experiment B) A printed laminate 1A, shown in Figure 1(b), was manufactured. However, the transparent substrate, the manufacturing method of each colored ink, and the printing method of each colored ink were the same as in Experiment A. The component ratios of each colored ink are shown in Table 1, and the ratios of each ink in each example and comparative example are shown in Table 3. In this experiment, the first colored ink was printed on the first main surface 2a of the transparent substrate 2 to form the first printed layer 4, and then the second ink was printed on top of it to form the second printed layer 5. Measurements were taken of the obtained printed laminate 1A in the same manner as in Experiment A, and the results are shown in Table 3.

[0063] [Table 3]

[0064] In Examples B1 to B9 shown in Table 3, the mass ratio of the blue pigment to the red pigment and the mass of the pigment in the printed layer satisfy the requirements of the present invention. As a result, the hue angle hW measured on a white substrate was 200° to 290° and the lightness L*W was 30 or higher, the hue angle hB measured on a black substrate was 0° to 70° and the lightness L*B was 20 or higher, and the optical density was in the range of 0.2 to 0.6. Therefore, significant dichroism was exhibited while maintaining high lightness on both white and black substrates.

[0065] In contrast, in Comparative Example B1, the mass ratio of the blue pigment to the red pigment was high at 0.76, resulting in a high hue angle hB of 354.2°.

[0066] In comparative example B2, the total amount of pigment in the printed layer 3A was 1.34 g / m². 2 Because of the high density, the optical density was high at 0.75, the lightness L*B on a black background was low at 19.3, and the lightness L*W on a white background was also low at 28.0.

[0067] In Comparative Example B3, the mass ratio of the blue pigment to the red pigment was low at 0.19, resulting in a high hue angle hW of 295.8° on a white substrate.

[0068] (Experiment C) A printed laminate 1B (see Figure 2(a)) was manufactured in the same manner as in Experiment B. However, unlike Experiment B, in this experiment, the second printed layer 5 and the first printed layer 4 were sequentially formed on the first main surface of the transparent substrate 2. Also, the observation surface A was the second main surface side 2b of the transparent substrate 2. The experiment was conducted in the same manner as in Experiment B, and results were obtained that were almost the same as in Experiment B.

[0069] (Experiment D) A printed laminate 1C (see Figure 2(b)) was manufactured in the same manner as in Experiment B. However, unlike Experiment B, in this experiment, the first printed layer 4 was printed on the first main surface 2a of the transparent substrate 2, and the second printed layer 5 was printed on the second main surface 2b. Also, the observation surface A was the surface 5a side of the second printed layer 5. The experiment was conducted in the same manner as in Experiment B, and results were obtained that were almost the same as in Experiment B. [Industrial applicability]

[0070] The printed laminate of the present invention possesses dichroism, making it suitable for a wide range of applications that utilize dichroism. Specifically, it can be widely used in applications where dichroism is used for design or decoration, and can be formed on various parts and the outer surfaces of containers. In particular, it allows for the easy production of printed materials for authenticity verification purposes, such as preventing counterfeiting. Furthermore, by placing the laminate of the present invention on a display panel, which is generally black when not in operation, it is possible to obtain an article that exhibits dichroism when the display's backlight is turned on or off.

Claims

1. A printed laminate having a transparent substrate and a colored ink printing layer on the transparent substrate, The colored ink printing layer contains a binder resin, a highly scattering red pigment, and a low scattering blue pigment, the mass ratio of the blue pigment to the red pigment is in the range of 0.20 to 0.60, and the total amount of the red pigment and the blue pigment contained in the colored ink printing layer is 0.3 to 0.9 g / m². ２ A printed laminate characterized by being within a certain range.

2. The printed laminate according to claim 1, characterized in that when the hue angle and lightness are measured in a 10° field of view using a D65 light source, the hue angle hW measured on a white substrate is 200° to 290° and the lightness L*W is 30 or more, and the hue angle hB measured on a black substrate is 0° to 70° and the lightness L*B is 20 or more.

3. The printed laminate according to claim 1, characterized in that the optical density is in the range of 0.2 to 0.

6.

4. The printed laminate according to claim 1 or 2, characterized in that the colored ink printing layer comprises a printing layer of colored ink containing the binder resin, the highly scattering red pigment, and the low scattering blue pigment.

5. The printed laminate according to claim 1 or 2, characterized in that the colored ink printing layer comprises a first printing layer containing the binder resin and the low-scattering blue pigment, and a second printing layer containing the binder resin and the high-scattering red pigment.

6. The printed laminate according to claim 5, characterized in that the first printed layer is provided on the first main surface of the transparent substrate, the second printed layer is provided on the first printed layer, and the surface of the second printed layer is an observation surface.

7. The printed laminate according to claim 5, wherein the second printed layer is provided on the first main surface of the transparent substrate, the first printed layer is provided on the second printed layer, and the second main surface of the transparent substrate opposite to the first main surface is an observation surface.

8. The printed laminate according to claim 5, characterized in that the first printed layer is provided on the first main surface of the transparent substrate, and the second printed layer is provided on the second main surface of the transparent substrate opposite to the first main surface, and the surface of the second printed layer is an observation surface.

9. The printed laminate according to claim 1 or 2, characterized in that the red pigment is iron oxide.

10. The printed laminate according to claim 1 or 2, characterized in that the blue pigment is a phthalocyanine-based pigment.

11. A method for manufacturing a printed laminate having a transparent substrate and a colored ink printing layer on the transparent substrate, A colored ink containing a binder resin, a highly scattering red pigment, and a low scattering blue pigment is printed onto the transparent substrate to form the colored ink printing layer. In this process, the mass ratio of the blue pigment to the red pigment in the colored ink printing layer is set to a range of 0.20 to 0.60, and the total amount of the red pigment and blue pigment contained in the colored ink printing layer is set to 0.3 to 0.9 g / m². ２ A method for manufacturing a printed laminate, characterized by being within the range of [specified range].

12. A method for producing a printed laminate comprising a transparent substrate and a colored ink printing layer on the transparent substrate, wherein the colored ink printing layer comprises a first printing layer containing a binder resin and a low-scattering blue pigment, and a second printing layer containing a binder resin and a high-scattering red pigment, The first printed layer is formed by printing a first colored ink containing the binder resin and the low-scattering blue pigment, and the second printed layer is formed by printing a second colored ink containing the binder resin and the high-scattering red pigment, wherein the mass ratio of the blue pigment to the red pigment in the colored ink printed layer is in the range of 0.20 to 0.60, and the total amount of the red pigment and the blue pigment contained in the colored ink printed layer is 0.3 to 0.9 g / m². ２ A method for manufacturing a printed laminate, characterized by being within the range of [specified range].

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