Label

Abstract

To provide a label capable of making information such as a company logo hardly visible regardless of an environmental atmosphere and contributing to the discovery of a forged product or a counterfeit product.SOLUTION: A laser printing label includes a first colored layer 10, an indicating layer 30 fitted to one surface of the first colored layer 10 so as to have an exposed surface, and a second colored layer 20 laminated on the other surface of the first colored layer 10, in which the indicating layer 30 is formed of a resin composition containing a base resin, a crosslinking agent, and a bright color pigment, and a blending amount of the bright color pigment is 1.0 to 10.0 parts by mass with respect to 100.0 parts by mass of the base resin.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a label for laser printing. More specifically, the present invention relates to a label that makes information such as a company logo attached to the label difficult to see regardless of the environmental atmosphere, thereby contributing to the detection of counterfeit or fake products. [Background technology]

[0002] 2. Description of the Related Art Generally, it is common practice to attach a label on which information such as a serial number and expiration date is printed to a product as part of product management, quality assurance, and the like.

[0003] As a label on which various information as described above can be printed, for example, a label on which information can be printed using a laser has been proposed (see, for example, Patent Document 1). Patent Document 1 discloses a label having a first colored layer, a second colored layer of a color different from that of the first colored layer, and an indication layer of a color different from that of the first colored layer and the second colored layer, the indication layer being embedded in one surface of the first colored layer so as to have an exposed surface, the second colored layer being laminated on the other surface of the first colored layer, and the cure shrinkage rate of the first colored layer being greater than that of the indication layer.

[0004] However, if a company logo or the like on a label is visible even under normal conditions, its presence is obvious and the label is likely to be targeted for counterfeiting or forgery. Labels have been proposed in which the recorded information (for example, a company logo) is not or is difficult to see under normal usage environments, but the information can be easily confirmed (see, for example, Patent Document 2). [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Patent No. 6050897 [Patent Document 2] Patent No. 7088632 Summary of the Invention [Problem to be solved by the invention]

[0006] The label disclosed in Patent Document 2 makes the information in the information section visible by utilizing the difference in water repellency between the resin substrate and the information section. Therefore, there is a concern that this purpose will not be achieved under conditions where there is a lot of moisture in the atmosphere around the label, such as high temperature and humidity conditions or rain.

[0007] Therefore, the problem that the present invention aims to solve is to provide a label that makes information such as a company logo less visible regardless of the environmental atmosphere, and that can contribute to the detection of counterfeit or fake products. [Means for solving the problem]

[0008] As a result of intensive research conducted by the inventors to achieve the above-mentioned object, they discovered that in a laser-markable label having a first colored layer, a marking layer inlaid on one side of the first colored layer so as to have an exposed surface, and a second colored layer laminated on the other side of the first colored layer, by using a glitter color pigment as a color pigment in the marking layer, it is possible to form a marking layer that has a different appearance when viewed from the front and from an oblique angle, and thus completed the present invention.

[0009] According to the present invention, there is provided a label as shown below.

[0010] [1] A laser-markable label having a first colored layer, a marking layer inlaid on one side of the first colored layer so as to have an exposed surface, and a second colored layer laminated on the other side of the first colored layer, wherein the marking layer is made of a resin composition containing a base resin, a crosslinking agent, and a glittering color pigment, and the amount of the glittering color pigment is 1.0 to 10.0 parts by mass per 100.0 parts by mass of the base resin constituting the marking layer.

[0011] [2] The label according to [1] above, wherein the glittering color pigment has an average particle size of 1.0 to 30.0 μm.

[0012] [3] The label according to [1] or [2], wherein the base resin is an acrylic resin.

[0013] [4] The label according to [1] or [2], wherein the crosslinking agent is an isocyanate-based crosslinking agent. [Effects of the Invention]

[0014] The label of the present invention makes information such as a company logo less visible regardless of the environmental atmosphere, thereby contributing to the detection of counterfeit or fake products. [Brief explanation of the drawings]

[0015] [Figure 1] 1 is a cross-sectional view of one embodiment of a label of the present invention. [Figure 2] FIG. 10 is a cross-sectional view of another embodiment of the label of the present invention. [Figure 3] 10 is a flowchart showing a method for manufacturing a label. [Figure 4] 10A and 10B are diagrams illustrating a marking layer forming step. [Figure 5] FIG. 10 is a diagram showing a first colored layer forming step. [Figure 6] FIG. 10 is a diagram showing a second colored layer forming step. [Figure 7] FIG. 10 is a diagram showing a peeling step. [Figure 8] FIG. 10 is a diagram showing a removal process. DETAILED DESCRIPTION OF THE INVENTION

[0016] Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings, but the present invention is not limited to these embodiments.

[0017] (1) Label: 1 is a diagram showing a cross section of one embodiment of a label of the present invention. The label 100 of this embodiment has, as its main components, a first colored layer 10, a second colored layer 20, and an indicator layer 30. The first colored layer has one side F1 including the exposed surface of the indicator layer 30, and another side F2 opposite to the first side F1 and in contact with the second colored layer 20.

[0018] (1-1) First colored layer: The first colored layer 10 is formed from a resin composition containing a base resin, a crosslinker, and a colorant. For example, the first colored layer 10 can be formed from a thermosetting resin solution containing a base resin, a crosslinker, a colorant, and an organic solvent. The resin solution for forming the first colored layer 10 is hereinafter also referred to as the "first colored layer resin solution." The first colored layer resin solution may optionally contain a curing catalyst, a leveling agent, a stabilizer, a flame retardant, an antioxidant, an antistatic agent, an antifungal agent, a lubricant, a filler, a matting agent, and the like. The first colored layer 10 is a layer of a different color from the second colored layer 20 and the marking layer 30.

[0019] Examples of the base resin used in the resin solution for the first colored layer include acrylic resins, epoxy resins, and urethane resins.

[0020] The colorant used in the resin solution for the first colored layer is not particularly limited, but is preferably one that can be removed by laser irradiation and has weather resistance and durability that allows for long-term use. The colorant can be selected from known colorants. Examples of colorants include inorganic, organic, azo, condensed polycyclic, and metal complex pigments. More specifically, examples of inorganic pigments include zinc oxide, zinc sulfide, titanium dioxide, calcium carbonate, silica, muscovite, carbon black, iron black, iron oxide yellow, titanium-antimony-nickel oxide, and aluminum powder. Examples of organic pigments include aniline black and perylene black. However, the inorganic and organic pigments are not limited to those described above.

[0021] The crosslinking agent used in the resin solution for the first colored layer is not particularly limited, and examples thereof include isocyanate-based crosslinking agents, epoxy-based crosslinking agents, melamine-based crosslinking agents, benzoguanamine-based crosslinking agents, urea-based crosslinking agents, metal chelate-based crosslinking agents, etc. For example, in terms of physical properties such as heat resistance and control of tensile elongation at break after crosslinking, an isocyanate-based crosslinking agent is preferred as the crosslinking agent used in the resin solution for the first colored layer.

[0022] The term "isocyanate-based crosslinking agent" refers to a compound having two or more isocyanate groups in one molecule. Examples of the isocyanate-based crosslinking agent include aliphatic polyisocyanate-based compounds, alicyclic polyisocyanate-based compounds, and aromatic polyisocyanate-based compounds.

[0023] Examples of the aliphatic polyisocyanate compound include an aliphatic polyisocyanate compound, a polymer of an aliphatic polyisocyanate compound, an adduct of an aliphatic polyisocyanate compound and a polyol compound (for example, trimethylolpropane (hereinafter also referred to as "TMP")), and a biuret of an aliphatic polyisocyanate compound. Specific examples of the aliphatic polyisocyanate compound include hexamethylene diisocyanate (HDI), pentamethylene diisocyanate (PDI), tetramethylene diisocyanate, trimethylhexamethylene diisocyanate, and lysine diisocyanate.

[0024] Examples of the alicyclic polyisocyanate compound include an alicyclic polyisocyanate compound, a polymer of an alicyclic polyisocyanate compound, an adduct of an alicyclic polyisocyanate compound and a polyol compound, and a biuret of an alicyclic polyisocyanate compound. Specific examples of the alicyclic polyisocyanate compound include isophorone diisocyanate (IPDI), hydrogenated tolylene diisocyanate, hydrogenated xylene diisocyanate, hydrogenated 4,4'-diphenylmethane diisocyanate, and 4,4'-dicyclohexylmethane diisocyanate.

[0025] Examples of the aromatic polyisocyanate compound include an aromatic polyisocyanate compound, a polymer of an aromatic polyisocyanate compound, an adduct of an aromatic polyisocyanate compound and a polyol compound, and a biuret of an aromatic polyisocyanate compound. Specific examples of aromatic polyisocyanate compounds include tolylene diisocyanate (TDI), xylylene diisocyanate (XDI), and 4,4'-diphenylmethane diisocyanate.

[0026] As the isocyanate-based crosslinking agent, an alicyclic polyisocyanate-based compound is preferred, and an isophorone diisocyanate-based compound is more preferred. Examples of the isophorone diisocyanate compound include IPDI, a biuret of IPDI, an IPDI polymer (for example, an isocyanurate), and an adduct of IPDI and a polyol compound. As the isophorone diisocyanate compound, an adduct of IPDI is preferred, and an adduct of IPDI and TMP is more preferred.

[0027] As the isocyanate-based crosslinking agent, currently or previously available commercially available products can be used. Examples of commercially available isocyanate crosslinking agents include "Coronate (registered trademark) HX", "HK", "HL", "HL-S", "L", "L-45E", "2031", "2037", "2234", "2770", "2785", "2793", "Aquanate (registered trademark) 200" and "210" (all manufactured by Tosoh Corporation), "Sumidur (registered trademark) N75", "N3300", "Desmodur (registered trademark) N75" Examples of such compounds include "MPA / X", "N100", "N3200" and "N3400" (all manufactured by Sumika Covestro Urethane Co., Ltd.), "Duranate (registered trademark) D201", "E405-70B", "E405-80T", "AE700-100", "24A-100", "TSE-100" and "TMA-100" (all manufactured by Asahi Kasei Corporation), and "Takenate (registered trademark) D-110N", "D-101E", "D-120N", "D-140N", "D-160N", "D-172N", "M-631N", "MT-Olestar (registered trademark) NP1200" and "Stabio (registered trademark) XD-340N" (all manufactured by Mitsui Chemicals, Inc.).

[0028] The crosslinking agent used in the resin solution for the first colored layer may be a single isocyanate-based crosslinking agent, or may be a mixture of two or more isocyanate-based crosslinking agents.

[0029] The amount of crosslinking agent used can be adjusted appropriately depending on the type of base resin, the type of crosslinking agent, the physical properties required of the first colored layer, etc. For example, the crosslinking agent is used in an amount such that the molar ratio of the crosslinkable functional groups in the crosslinking agent to the reactive functional groups in the base resin is preferably 0.5 to 1.5, more preferably 0.8 to 1.2. Here, the reactive functional group varies depending on the crosslinkable functional group. For example, when the crosslinkable functional group is an isocyanate group, the reactive functional group is a hydroxyl group, a carboxyl group, an amino group, etc., and can be determined based on the technical common sense of a person skilled in the art.

[0030] Examples of epoxy crosslinking agents include triglycidyl isocyanurate, phenol novolac epoxy resins, and other epoxy resins obtained by epoxidizing novolac resins obtained by condensing or co-condensing phenols such as phenols, cresol, xylenol, resorcinol, catechol, bisphenol A, bisphenol F, and / or naphthols such as α-naphthol, β-naphthol, and dihydroxynaphthalene with compounds having an aldehyde group such as formaldehyde, acetaldehyde, propionaldehyde, benzaldehyde, and salicylaldehyde under an acidic catalyst; diglycidyl ethers of bisphenol A, bisphenol F, bisphenol S, and bisphenol A / D; biphenyl epoxy resins, which are glycidyl ethers of alkyl-substituted or unsubstituted biphenols; and phenols and / or naphthols with dimethoxyparabens. Epoxidized aralkyl resins such as phenol-aralkyl resins, naphthol-aralkyl resins, and biphenyl-aralkyl resins synthesized from xylene or bis(methoxymethyl)biphenyl; stilbene-type epoxy resins; hydroquinone-type epoxy resins; glycidyl ester-type epoxy resins obtained by reacting polybasic acids such as phthalic acid and dimer acid with epichlorohydrin; dicyclopentadiene-type epoxy resins; epoxy resins containing naphthalene rings; triphenylmethane-type epoxy resins; trimethylolpropane-type epoxy resins; terpene-modified epoxy resins; epoxy resins containing sulfur atoms; aliphatic epoxy resins obtained by oxidizing olefin bonds with peroxides; alicyclic epoxy resins; and epoxy resins modified with silicone, acrylonitrile, butadiene, isoprene-based rubber, polyamide-based resin, etc.

[0031] Examples of melamine-based crosslinking agents that can be used include melamine, methylolated melamine derivatives obtained by condensing melamine with formaldehyde, compounds obtained by reacting methylolated melamine with a lower alcohol to partially or completely etherify it, and mixtures of these. Furthermore, melamine-based crosslinking agents may be condensates of monomers or dimers or higher polymers, or mixtures of these. More specific examples include imino group-type methylated melamine resins, methylol group-type melamine resins, methylol group-type methylated melamine resins, and fully alkylated methylated melamine resins.

[0032] Examples of benzoguanamine-based crosslinking agents that can be used include benzoguanamine, methylolated benzoguanamine derivatives obtained by condensing benzoguanamine with formaldehyde, compounds obtained by reacting methylolated benzoguanamine with a lower alcohol to partially or completely etherify it, and mixtures of these. Benzoguanamine-based crosslinking agents may also be condensates of monomers or dimers or higher polymers, or mixtures of these. More specific examples include butylated benzoguanamine resins and methylolated benzoguanamine resins.

[0033] Examples of urea-based crosslinking agents that can be used include methylolated urea derivatives obtained by condensing urea with formaldehyde, compounds obtained by reacting methylolated urea with a lower alcohol to partially or completely etherify it, and mixtures thereof. Urea-based crosslinking agents may also be condensates of monomers or dimers or higher polymers, or mixtures thereof. More specific examples include butylated urea resins and methylolated urea resins.

[0034] Examples of the metal chelate crosslinking agent include aluminum chelate crosslinking agents, zirconium chelate crosslinking agents, titanium chelate crosslinking agents, chromium chelate crosslinking agents, cobalt chelate crosslinking agents, copper chelate crosslinking agents, iron chelate crosslinking agents, nickel chelate crosslinking agents, vanadium chelate crosslinking agents, zinc chelate crosslinking agents, indium chelate crosslinking agents, calcium chelate crosslinking agents, magnesium chelate crosslinking agents, manganese chelate crosslinking agents, yttrium chelate crosslinking agents, cerium chelate crosslinking agents, strontium chelate crosslinking agents, barium chelate crosslinking agents, molybdenum chelate crosslinking agents, lanthanum chelate crosslinking agents, and tin chelate crosslinking agents, among which aluminum chelate crosslinking agents, zirconium chelate crosslinking agents, and titanium chelate crosslinking agents are preferred, and aluminum chelate crosslinking agents are more preferred.

[0035] (1-2) Second colored layer: The second colored layer 20 is laminated on the surface F2 opposite to the surface F1 of the first colored layer 10, which includes the exposed surface of the indicator layer 30. The second colored layer 20 is preferably a layer of a different color from the first colored layer 10 and the indicator layer 30. The second colored layer 20 is formed from a resin composition containing a base resin, a crosslinker, and a colorant. For example, the second colored layer 20 can be formed from a thermosetting resin solution containing a base resin, a crosslinker, a colorant, and an organic solvent. The resin solution for forming the second colored layer 20 is hereinafter also referred to as the "second colored layer resin solution." The second colored layer resin solution may optionally contain a curing catalyst, leveling agent, stabilizer, flame retardant, antioxidant, antistatic agent, mildew inhibitor, lubricant, filler, flexibility agent, matting agent, etc. In this embodiment, the base resin and crosslinker of the second colored layer resin solution are preferably mixed immediately before coating.

[0036] Examples of the base resin used in the resin solution for the second colored layer include acrylic resins, epoxy resins, and urethane resins.

[0037] The colorant used in the resin solution for the second colored layer is not particularly limited, but is preferably one that can be removed by laser irradiation and has weather resistance and durability that allows for long-term use. The colorant can be selected from known colorants. Examples of colorants include inorganic, organic, azo, condensed polycyclic, and metal complex pigments. More specifically, examples of inorganic pigments include zinc oxide, zinc sulfide, titanium dioxide, calcium carbonate, silica, muscovite, carbon black, and iron black. Examples of organic pigments include aniline black and perylene black. However, the inorganic and organic pigments are not limited to those described above.

[0038] There are no particular restrictions on the crosslinking agent used in the resin solution for the second colored layer, and examples include isocyanate-based crosslinking agents, epoxy-based crosslinking agents, melamine-based crosslinking agents, benzoguanamine-based crosslinking agents, urea-based crosslinking agents, and metal chelate-based crosslinking agents. Examples of the isocyanate-based crosslinking agent include the isocyanate-based crosslinking agents exemplified as the crosslinking agent used in the resin solution for the first colored layer. As the isocyanate-based crosslinking agent, in consideration of flexibility after crosslinking, an aliphatic polyisocyanate-based compound is preferred, and a hexamethylene diisocyanate-based compound is more preferred. Examples of hexamethylene diisocyanate compounds include HDI, biuret of HDI, polymers of HDI (for example, isocyanurate), and adducts of HDI and polyol compounds. As the hexamethylene diisocyanate-based compound, a polymer of HDI is preferred, and an isocyanurate of HDI is more preferred.

[0039] In addition, examples of the epoxy-based crosslinking agent, melamine-based crosslinking agent, benzoguanamine-based crosslinking agent, urea-based crosslinking agent, and metal chelate-based crosslinking agent include the same crosslinking agents as the epoxy-based crosslinking agent, melamine-based crosslinking agent, benzoguanamine-based crosslinking agent, urea-based crosslinking agent, and metal chelate-based crosslinking agent exemplified for the first colored layer 10.

[0040] (1-3) Indication layer: The marking layer 30 represents marks such as letters, symbols, or figures, and is a layer of a color different from the color of the second colored layer 20.

[0041] The marking layer 30 is made of a resin composition containing a base resin, a crosslinking agent, and a photoluminescent color pigment. For example, the marking layer 30 can be formed from a thermosetting resin solution containing a base resin, a crosslinking agent, a photoluminescent color pigment, and an organic solvent. The resin solution for forming the marking layer 30 is hereinafter also referred to as the "marking layer resin solution." The marking layer resin solution may optionally contain a curing catalyst, a leveling agent, a stabilizer, a flame retardant, an antioxidant, an antistatic agent, an antifungal agent, a lubricant, a filler, a matting agent, and the like. In this embodiment, the base resin and crosslinking agent of the marking layer resin solution are preferably mixed immediately before application.

[0042] Examples of base resins used in the resin solution for the marking layer include acrylic resins, epoxy resins, and urethane resins. While not particularly limited, the base resin constituting the marking layer 30 is preferably an acrylic resin. For example, since acrylic resins are amorphous, they thermally decompose without melting. During thermal decomposition, (meth)acrylic monomers are released as gas, primarily due to cleavage of the main chain. Therefore, including an acrylic resin in the marking layer 30 is preferable because it results in sharper printing with laser light.

[0043] The crosslinking agent used in the resin solution for the marking layer is not particularly limited, and examples thereof include isocyanate-based crosslinking agents and epoxy-based crosslinking agents. Here, the crosslinking agent used in the resin solution for the marking layer is preferably a crosslinking agent that results in a smaller cure shrinkage rate for the marking layer 30 than for the first colored layer 10. Examples of such crosslinking agents include isocyanate-based crosslinking agents and epoxy-based crosslinking agents. In particular, isocyanate-based crosslinking agents are preferred for use in the resin solution for the marking layer. For example, isocyanate-based crosslinking agents exhibit good reactivity with both hydroxyl groups and acid groups, and the balance between usable time (pot life) and drying speed can be adjusted by selecting the appropriate type. In terms of performance, both isocyanate-based crosslinking agents and epoxy-based crosslinking agents are suitable for use, as they offer good heat resistance, acid and alkali resistance, abrasion resistance, heat resistance, and transparency.

[0044] The marking layer 30 contains a glittering color pigment as a colorant. By including the glittering color pigment in the marking layer 30, it is possible to realize a marking layer 30 in the label 100 of this embodiment that has a different appearance when viewed from the front and from an oblique angle. Therefore, the label 100 of this embodiment can make information such as a company logo provided on the label 100 by the marking layer 30 less visible, which can contribute to the detection of counterfeit products and fake products.

[0045] In this specification, the term "lustrous color pigment" refers to a pigment that exhibits lustrous properties such as gloss and pearlescence. Examples of the lustrous color pigment include oxide-coated mica such as titanium oxide-coated silica, mica titanium, iron oxide-coated mica, iron oxide-coated mica titanium, Prussian blue-coated mica titanium, Prussian blue-iron oxide-coated mica titanium, chromium oxide-coated mica titanium, carmine-coated mica titanium, organic pigment-coated mica titanium, titanium oxide-coated mica, and titanium oxide-coated synthetic mica; oxide-coated glass powder such as titanium oxide-coated glass powder and iron oxide-coated glass powder; and oxide-coated metal particles such as titanium oxide-coated aluminum powder.

[0046] Examples of titanium oxide-coated mica include Black Diamond (registered trademark) M010-1 and -2 (trade name: manufactured by Ako Kasei Co., Ltd.). Examples of titanium oxide-coated glass powder include Black Diamond (registered trademark) G014H and G070H (trade name: manufactured by Ako Kasei Co., Ltd.). Examples of metal oxide-coated mica include Lumina (registered trademark) Royal Exterior Indigo 5803H (trade name: manufactured by DIC Corporation). Examples of titanium oxide-coated synthetic mica include TWINCLEPEARL SXA-S0 (trade name: manufactured by Nihon Koken Kogyo Co., Ltd.).

[0047] In the label 100 of this embodiment, the amount of glittering color pigment is 1.0 to 10.0 parts by mass relative to 100.0 parts by mass of the base resin constituting the marking layer 30. The amount of glittering color pigment described above makes the marking layer 30 less noticeable, making the information provided by the marking layer 30 less visible. For example, if the amount of glittering color pigment exceeds 10.0 parts by mass, the marking layer 30 becomes more noticeable, and when information such as letters or figures is printed on the first colored layer 10 and the marking layer 30 using a laser, the printed letters and figures become less clear. While not particularly limited, the amount of glittering color pigment is preferably 1.0 to 5.0 parts by mass, more preferably 1.3 to 5.0 parts by mass, relative to 100.0 parts by mass of the base resin.

[0048] There are no particular restrictions on the average particle size of the glittering color pigment. For example, from the viewpoint of hiding power, the average particle size of the glittering color pigment is preferably 1.0 to 30.0 μm, and more preferably 5.0 to 30.0 μm. The average particle size of the glittering color pigment is a value measured by the following measurement method. First, the glittering color pigment is dispersed in distilled water, and the concentration is adjusted so that the transmittance of a semiconductor laser (wavelength 650 nm) is 80% to 90%. Then, the aqueous solution with the adjusted concentration is used as a measurement sample, and the average particle size of the glittering color pigment is measured using a laser diffraction / scattering particle size distribution analyzer "Partica LA-960" (manufactured by Horiba, Ltd.).

[0049] The marking layer 30 has an exposed surface that is exposed on one side F1 of the first colored layer 10. From the viewpoint of improving adhesion with the first colored layer 10, the area ratio of the exposed surface of the marking layer 30 to the surface area of ​​one side F1 of the label is preferably 1% to 50%, more preferably 1% to 40%, and even more preferably 1% to 30%.

[0050] The thickness of the first colored layer 10 in the label 100 is preferably 3 to 30 μm, the thickness of the second colored layer 20 is preferably 40 to 120 μm, and the thickness of the marking layer 30 is preferably 0.5 to 27.5 μm.

[0051] The first colored layer 10 and the second colored layer 20 are preferably layers of different colors. By configuring them in this way, the boundary between the first colored layer 10 and the second colored layer 20 becomes visible. The first colored layer 10 and the marking layer 30 are preferably layers of the same color system. This configuration allows the marking layer 30 to be one in which information such as a company logo is difficult to see, regardless of the environmental atmosphere. Furthermore, the second colored layer 20 and the marking layer 30 are preferably layers of different colors. This configuration allows the second colored layer 20 and the marking layer 30 to be visible. According to the above-described preferred embodiment, when desired locations of the marking layer 30 and the first colored layer are removed with a laser to expose the second colored layer 20 and print information, the second colored layer 20 can be seen. Therefore, the label 100 of this embodiment is useful as a label for laser marking.

[0052] Fig. 2 is a cross-sectional view of a label 200 according to another embodiment. As shown in Fig. 2, the label 200 of this embodiment may be provided with a brittle layer 41, an adhesive layer 42, and a release layer 43 in addition to the first colored layer 10, the second colored layer 20, and the marking layer 30.

[0053] The brittle layer 41 is a layer that breaks down when the label from which the peeling layer 43 has been peeled is peeled off after being attached to a product, making the label unusable.

[0054] The brittle layer 41 can be formed from a resin paint in which a brittleness-imparting component is added to the resin solution for forming the second colored layer 20 .

[0055] Examples of brittleness-imparting components added to the resin coating to form the brittle layer 41 include inorganic particles such as glass beads, silica, and calcium carbonate, and organic particles such as acrylic beads, styrene beads, and silicone beads.

[0056] Next, we will explain the manufacturing method of the label 100. Figure 3 is a flowchart showing the manufacturing method of the label 100. As shown in Figure 3, the manufacturing method of the label 100 mainly includes a marking layer forming step P1, a first colored layer forming step P2, a second colored layer forming step P3, and a peeling step P4.

[0057] (Indication layer formation process P1) The marking layer forming process P1 is a process for forming the marking layer 30 of the label 100 shown in FIG. 1. In the marking layer forming process P1, first, a marking layer resin solution for forming the marking layer 30 is prepared. The marking layer resin solution can be prepared by mixing the base resin, crosslinking agent, photoluminescent color pigment, organic solvent, and the like for forming the marking layer 30 described above. In this process, the marking layer resin solution becomes a resin coating for forming the marking layer 30. In this process, as a first step, as shown in FIG. 4, a resin coating 50 made from the above-described marking layer resin solution is applied to one surface of the substrate 40 in a pattern representing a predetermined mark.

[0058] The substrate 40 may be a film of polyethylene terephthalate (hereinafter also referred to as "PET"), polyethylene naphthalate (hereinafter also referred to as "PEN"), paper, or the like, the surface of which has been treated with a coating agent containing polyolefin, silicone, fluorine, silica, beads, wax, or the like, or an untreated PET or PEN film, etc. Furthermore, the substrate 40 may be embossed or corona-treated, etc.

[0059] The method for applying the resin coating material 50 onto one surface of the substrate 40 is not particularly limited, but examples thereof include gravure printing, screen printing, and seal printing.

[0060] Thereafter, in the second step, the resin coating 50 applied to one surface of the substrate 40 is heated and cured to form the marking layer 30 having a pattern that represents a predetermined mark.

[0061] In this step P1, by using the resin coating material 50 that hardens when heated, the resin coating material 50 can be hardened uniformly regardless of the thickness thereof, and a marking layer 30 having sufficient strength can be obtained.

[0062] (First colored layer formation step P2) The first colored layer forming process P2 is a process for forming the first colored layer 10 of the label 100 shown in FIG. 1. In the first colored layer forming process P2, first, a resin solution for the first colored layer for forming the first colored layer 10 is prepared. The resin solution for the first colored layer can be prepared by mixing the base resin, crosslinking agent, colorant, organic solvent, and the like for forming the first colored layer 10 described above. In this process, the resin solution for the first colored layer becomes a resin coating material for forming the first colored layer 10. In this process, as a first step, as shown in FIG. 5, a resin coating material 60 made from the resin solution for the first colored layer described above is applied to one surface of the substrate 40 and the surface of the marking layer 30.

[0063] Thereafter, in the second step, the resin paint 60 applied to one side of the substrate 40 and the surface of the marking layer 30 is heated and cured to form the first colored layer 10.

[0064] In this step P2, by using the resin coating material 60 that hardens when heated, the resin coating material 60 can be hardened uniformly regardless of the thickness thereof, and a first colored layer 10 having sufficient strength can be obtained.

[0065] (Second colored layer formation step P3) The second colored layer forming process P3 is a process for forming the second colored layer 20 of the label 100 shown in FIG. 1. In the second colored layer forming process P3, first, a resin solution for forming the second colored layer 20 is prepared. The resin solution for the second colored layer can be prepared by mixing the base resin, crosslinking agent, colorant, and organic solvent used to form the second colored layer 20 described above. In this process, the resin solution for the second colored layer becomes a resin coating material for forming the second colored layer 20. FIG. 6 illustrates the second colored layer forming process P3. In this process, as shown in FIG. 6, in the first step, a resin coating material 70 made from the second colored layer resin solution described above is applied to one surface of the first colored layer 10 formed in the first colored layer forming process P2. Then, in the second step, the resin coating material 70 is heat-cured to form the second colored layer 20.

[0066] In this step P3, by using a resin coating material 70 that hardens when heated, the resin coating material 70 can be hardened uniformly regardless of the thickness thereof, and a second colored layer 20 having sufficient strength can be obtained.

[0067] (Peeling process P4) The peeling step P4 is a step of peeling the substrate 40 from the indication layer 30 and the first colored layer 10. Fig. 7 is a diagram showing the peeling step P4. As shown in Fig. 7, by peeling the substrate 40 from the indication layer 30 and the first colored layer 10, a label 100 having the first colored layer 10, the second colored layer 20, and the indication layer 30 can be produced.

[0068] The above is the method for manufacturing the label 100. When manufacturing the label 200 as shown in Fig. 2, the label 200 can be manufactured by carrying out a brittle layer forming step and an adhesive layer and peeling layer forming step before the peeling step P4. In this case, the brittle layer forming step is carried out after the second colored layer forming step P3, and a brittle layer 41 (see Fig. 2) is formed on one surface of the second colored layer 20.

[0069] The labels 100 (see FIG. 1) and 200 (see FIG. 2) manufactured in this manner can have information printed thereon using a laser. For example, information can be printed by removing a portion of the first colored layer 10 and the marking layer 30 using a laser to expose the second colored layer 20.

[0070] 8 is a diagram showing how information such as letters and designs is printed on a label 100 using a laser. As shown in FIG. 8, the first colored layer 10 and the marking layer 30 are irradiated with laser light L to form a removed portion 80. As a result, when the side irradiated with the laser light L is observed, the information becomes visible by comparing the removed portion 80 with the remaining non-removed portions. Note that when the laser light L is irradiated, even a portion of the second colored layer 20 may be removed. [Example]

[0071] The present invention will be specifically explained below with reference to examples and comparative examples, but the present invention is not limited to these examples in any way.

[0072] (Preparation of acrylic resins (1) to (3)) The acrylic resins (1) to (3) used in the present examples and comparative examples were prepared as follows: Details of the acrylic resins (1) to (3) are shown in Table 1 below.

[0073] The synthesis method for acrylic resins (1) to (3) is described below. Each acrylic resin was synthesized by solution polymerization. More specifically, an azo-based polymerization initiator was added to a predetermined amount of monomer mixture using an ester-based solvent under reflux temperature conditions. Next, the remaining monomer mixture was successively added dropwise over a predetermined time period, and the polymerization reaction was continued for another predetermined time period. Thereafter, the solution was diluted with a reaction solvent to a predetermined solids concentration, thereby obtaining solutions of each of acrylic resins (1) to (3).

[0074] In Table 1 below, the column "Monomer composition (parts by mass)" indicates the type and amount of monomer used in synthesizing the acrylic resins (1) to (3).

[0075] In Table 1 below, the column "Tg (°C)" indicates the glass transition temperature (°C) of the acrylic resins (1) to (3). The glass transition temperature (°C) was measured using a differential scanning calorimeter (DSC) in a nitrogen gas flow, with 10 mg of the measurement sample (i.e., homopolymer) at a heating rate of 10°C / min. The inflection point of the obtained DSC curve was taken as the glass transition temperature of the acrylic resins (1) to (3). The differential scanning calorimeter used was a differential scanning calorimeter manufactured by TA Instruments Japan (trade name: Discovery DSC 2500).

[0076] The glass transition temperature (°C) is a glass transition temperature calculated from the following formula (1), and is a value obtained by converting absolute temperature (unit: K; the same applies hereinafter) into Celsius temperature (unit: °C; the same applies hereinafter).

[0077] 1 / Tg=m1 / Tg1+m2 / Tg2+···+m(k-1) / Tg(k-1)+mk / Tgk···(1)

[0078] In the above formula (1), Tg1, Tg2, . . . , Tg(k-1), and Tgk represent the glass transition temperatures expressed as absolute temperatures when each monomer constituting the (meth)acrylic copolymer is made into a homopolymer. m1, m2, . . . , m(k-1), and mk represent the mole fractions of each monomer constituting the (meth)acrylic copolymer, respectively, and the equation is m1 + m2 + . . . + m(k-1) + mk = 1.

[0079] In addition, in the following Table 1, the column "Mw (10,000)" indicates the weight average molecular weight (10,000) of the acrylic resins (1) to (3), and the column "Solid content (mass%)" indicates the solid content concentration (mass%) of the acrylic resins (1) to (3). The term "solid content concentration (mass%)" used herein refers to the mass proportion of each acrylic resin in the solution obtained by synthesizing each acrylic resin. The weight-average molecular weight (10,000) of each of the acrylic resins (1) to (3) is a value measured by the following method. (1) After applying the acrylic resin solution to a release paper, it is dried at 100°C for 1 minute to obtain a film of the acrylic resin. (2) Using the film-like acrylic resin obtained in (1) above and tetrahydrofuran, a sample solution with a solids concentration of 0.2% by mass is obtained. Note that the "solids concentration" here refers to the mass proportion of the acrylic resin in the sample solution. (3) After filtering the sample solution obtained in (2) above through a filter (pore size: 0.25 μm), the weight-average molecular weight of the acrylic resin is determined as a standard polystyrene equivalent value by gel permeation chromatography (GPC) under the following conditions.

[0080] ~Conditions~ Measurement equipment: High-speed GPC (Model: HLC-8420 GPC, manufactured by Tosoh Corporation) Detector: Differential refractometer (RI) [built into HLC-8420, manufactured by Tosoh Corporation] Column: TSKgel GMH XL Two [Tosoh] Column temperature: 40℃ Eluent: tetrahydrofuran Sample solution injection volume: 100 μL Flow rate: 0.8mL / min

[0081] [Table 1]

[0082] The abbreviations in Table 1 above and the glass transition temperatures (Tg) of the corresponding homopolymers are shown below. EA: Ethyl acrylate (Tg: -22°C). nBA: n-butyl acrylate (Tg: -54°C). MMA: Methyl methacrylate (Tg: 105°C). nBMA: n-butyl methacrylate (Tg: 20°C). 2HEMA: 2-hydroxyethyl methacrylate (Tg: 85°C). ·AA: acrylic acid (Tg: 106°C).

[0083] (Preparation of Brilliant Colored Resin Solution (1) for Marking Layer) A luminous colored resin solution (1) for the marking layer was prepared by mixing 50.0 parts by mass of an acrylic resin (1), 50.0 parts by mass of an acrylic resin (2), 1.3 parts by mass of a luminous black pigment “Black Diamond (registered trademark) M010-01” (manufactured by Ako Kasei Co., Ltd., average particle size 13.5 μm), 26.0 parts by mass of an isocyanate crosslinking agent “Takenate D140N (60)” (manufactured by Mitsui Chemicals, Inc.), 48.5 parts by mass of methyl ethyl ketone (MEK), and 48.5 parts by mass of toluene.

[0084] (Preparation of bright colored resin solution (2) for marking layer) A lustrous colored resin solution (2) for the marking layer was prepared in the same manner as the preparation of the lustrous colored resin solution (1) for the marking layer, except that 2.5 parts by mass of the lustrous black pigment "Black Diamond (registered trademark) M010-01" (manufactured by Ako Kasei Co., Ltd., average particle size 13.5 μm), 50.0 parts by mass of methyl ethyl ketone (MEK), and 50.0 parts by mass of toluene were used.

[0085] (Preparation of bright colored resin solution (3) for marking layer) A lustrous colored resin solution (3) for the marking layer was prepared in the same manner as in the preparation of the lustrous colored resin solution (1) for the marking layer, except that 5.0 parts by mass of the lustrous black pigment "Black Diamond (registered trademark) M010-01" (manufactured by Ako Kasei Co., Ltd., average particle size 13.5 μm), 53.0 parts by mass of methyl ethyl ketone (MEK), and 53.0 parts by mass of toluene were used.

[0086] (Preparation of bright colored resin solution (4) for marking layer) A lustrous colored resin solution (4) for the marking layer was prepared in the same manner as in the preparation of the lustrous colored resin solution (1) for the marking layer, except that 10.0 parts by mass of the lustrous black pigment "Black Diamond (registered trademark) M010-01" (manufactured by Ako Kasei Co., Ltd., average particle size 13.5 μm), 53.0 parts by mass of methyl ethyl ketone (MEK), and 53.0 parts by mass of toluene were used.

[0087] (Preparation of bright colored resin solution (5) for marking layer) A lustrous colored resin solution (5) for the marking layer was prepared in the same manner as in the preparation of the lustrous colored resin solution (1) for the marking layer, except that the lustrous black pigment "Black Diamond (registered trademark) G014H" (manufactured by Ako Chemicals Co., Ltd., average particle size 15.8 μm) was used instead of the lustrous black pigment "Black Diamond (registered trademark) M010-01" (manufactured by Ako Chemicals Co., Ltd., average particle size 13.5 μm).

[0088] (Preparation of bright colored resin solution (6) for marking layer) A lustrous colored resin solution (6) for the marking layer was prepared in the same manner as in the preparation of the lustrous colored resin solution (2) for the marking layer, except that the lustrous black pigment "Black Diamond (registered trademark) G014H" (manufactured by Ako Chemicals Co., Ltd., average particle size 15.8 μm) was used instead of the lustrous black pigment "Black Diamond (registered trademark) M010-01" (manufactured by Ako Chemicals Co., Ltd., average particle size 13.5 μm).

[0089] (Preparation of bright colored resin solution (7) for marking layer) A lustrous colored resin solution (7) for the marking layer was prepared in the same manner as in the preparation of the lustrous colored resin solution (3) for the marking layer, except that the lustrous black pigment "Black Diamond (registered trademark) G014H" (manufactured by Ako Chemicals Co., Ltd., average particle size 15.8 μm) was used instead of the lustrous black pigment "Black Diamond (registered trademark) M010-01" (manufactured by Ako Chemicals Co., Ltd., average particle size 13.5 μm).

[0090] (Preparation of bright colored resin solution (8) for marking layer) A lustrous colored resin solution (8) for the marking layer was prepared in the same manner as in the preparation of the lustrous colored resin solution (4) for the marking layer, except that the lustrous black pigment "Black Diamond (registered trademark) G014H" (manufactured by Ako Chemicals Co., Ltd., average particle size 15.8 μm) was used instead of the lustrous black pigment "Black Diamond (registered trademark) M010-01" (manufactured by Ako Chemicals Co., Ltd., average particle size 13.5 μm).

[0091] (Preparation of bright colored resin solution (9) for marking layer) A lustrous colored resin solution (9) for the marking layer was prepared in the same manner as in the preparation of the lustrous colored resin solution (1) for the marking layer, except that a lustrous blue pigment "Lumina (registered trademark) Royal Exterior Indigo 5803H" (manufactured by DIC Corporation, average particle size 20.6 μm) was used instead of the lustrous black pigment "Black Diamond (registered trademark) M010-01" (manufactured by Ako Kasei Co., Ltd., average particle size 13.5 μm).

[0092] (Preparation of bright colored resin solution (10) for marking layer) A lustrous colored resin solution (10) for the marking layer was prepared in the same manner as in the preparation of the lustrous colored resin solution (2) for the marking layer, except that a lustrous blue pigment "Lumina (registered trademark) Royal Exterior Indigo 5803H" (manufactured by DIC Corporation, average particle size 20.6 μm) was used instead of the lustrous black pigment "Black Diamond (registered trademark) M010-01" (manufactured by Ako Kasei Co., Ltd., average particle size 13.5 μm).

[0093] (Preparation of bright colored resin solution (11) for marking layer) A lustrous colored resin solution (11) for the marking layer was prepared in the same manner as in the preparation of the lustrous colored resin solution (3) for the marking layer, except that a lustrous blue pigment "Lumina (registered trademark) Royal Exterior Indigo 5803H" (manufactured by DIC Corporation, average particle size 20.6 μm) was used instead of the lustrous black pigment "Black Diamond (registered trademark) M010-01" (manufactured by Ako Kasei Co., Ltd., average particle size 13.5 μm).

[0094] (Preparation of Resin Solution (0) for Marking Layer) Resin solution (0) for the marking layer was prepared in the same manner as in the preparation of the bright colored resin solution (1) for the marking layer, except that no bright color pigment was used and methyl ethyl ketone (MEK) was 47.0 parts by mass and toluene was 47.0 parts by mass.

[0095] (Preparation of Colored Resin Solution (1) for Marking Layer) A colored resin solution (1) for the marking layer was prepared in the same manner as the preparation of the bright colored resin solution (2) for the marking layer, except that 16.7 parts by mass of the black pigment "NBK-968" (manufactured by Nikko Bix Co., Ltd.) was used instead of the bright black pigment "Black Diamond (registered trademark) M010-01" (manufactured by Ako Kasei Co., Ltd., average particle size 13.5 μm).

[0096] (Preparation of colored resin solution (2) for marking layer) A colored resin solution (2) for the marking layer was prepared in the same manner as in the preparation of the bright colored resin solution (2) for the marking layer, except that 0.8 parts by mass of a white pigment "NBK-967" (manufactured by Nikko Bix Co., Ltd.) was used instead of the bright black pigment "Black Diamond (registered trademark) M010-01" (manufactured by Ako Kasei Co., Ltd., average particle size 13.5 μm).

[0097] (Preparation of colored resin solution (3) for marking layer) A colored resin solution (3) for the marking layer was prepared in the same manner as the preparation of the bright colored resin solution (2) for the marking layer, except that 3.8 parts by mass of a white pigment "NBK-967" (manufactured by Nikko Bix Co., Ltd.) was used instead of the bright black pigment "Black Diamond (registered trademark) M010-01" (manufactured by Ako Kasei Co., Ltd., average particle size 13.5 μm).

[0098] (Preparation of colored resin solution (4) for marking layer) A colored resin solution (4) for the marking layer was prepared in the same manner as the preparation of the bright colored resin solution (2) for the marking layer, except that 7.6 parts by mass of a white pigment "NBK-967" (manufactured by Nikko Bix Co., Ltd.) was used instead of the bright black pigment "Black Diamond (registered trademark) M010-01" (manufactured by Ako Kasei Co., Ltd., average particle size 13.5 μm).

[0099] (Preparation of colored resin solution (5) for marking layer) A colored resin solution (5) for the marking layer was prepared in the same manner as the preparation of the bright colored resin solution (2) for the marking layer, except that 1.0 parts by mass of a blue pigment "HAS-Conc 391 Indigo" (manufactured by Teikoku Ink Mfg. Co., Ltd.) was used instead of the bright black pigment "Black Diamond (registered trademark) M010-01" (manufactured by Ako Kasei Co., Ltd., black, average particle size 13.5 μm).

[0100] (Preparation of colored resin solution (6) for marking layer) A colored resin solution (6) for the marking layer was prepared in the same manner as the preparation of the bright colored resin solution (2) for the marking layer, except that 5.0 parts by mass of a blue pigment "HAS-Conc 391 Indigo" (manufactured by Teikoku Ink Mfg. Co., Ltd.) was used instead of the bright black pigment "Black Diamond (registered trademark) M010-01" (manufactured by Ako Kasei Co., Ltd., average particle size 13.5 μm).

[0101] (Preparation of colored resin solution (7) for marking layer) A colored resin solution (7) for the marking layer was prepared in the same manner as the preparation of the bright colored resin solution (2) for the marking layer, except that 10.0 parts by mass of a blue pigment "HAS-Conc 391 Indigo" (manufactured by Teikoku Ink Mfg. Co., Ltd.) was used instead of the bright black pigment "Black Diamond (registered trademark) M010-01" (manufactured by Ako Kasei Co., Ltd., average particle size 13.5 μm).

[0102] [Average particle size of glittering color pigment (μm)] The average particle size of the brilliant color pigments was measured as follows: Each brilliant color pigment was dispersed in distilled water, and the concentration was adjusted so that the transmittance of a semiconductor laser (650 nm) was 80 to 90%. This aqueous solution was used as a measurement sample, and the average particle size of each brilliant color pigment was measured using a laser diffraction / scattering particle size distribution analyzer "Partica LA-960" (manufactured by Horiba, Ltd.).

[0103] (Preparation of resin solution for first colored layer) A resin solution for the first colored layer was prepared by mixing 50.0 parts by mass of acrylic resin (1), 50.0 parts by mass of acrylic resin (2), 26.0 parts by mass of isocyanate crosslinking agent "Takenate D140N (60)" (manufactured by Mitsui Chemicals, Inc.), 1.0 part by mass of curing catalyst "Nacem Zirconium" (manufactured by Nippon Chemical Industries, Inc., 1% by mass solution in acetylacetone), 25.0 parts by mass of black pigment "NBK-968" (manufactured by Nichiko Bix Co., Ltd.), and 23.0 parts by mass of methyl isobutyl ketone (MIBK).

[0104] (Preparation of Resin Solution for Second Colored Layer) A resin solution for the second colored layer was prepared by mixing 50.0 parts by mass of acrylic resin (1), 50.0 parts by mass of acrylic resin (2), 11.0 parts by mass of the isocyanate crosslinking agent "Coronate HK" (manufactured by Nippon Polyurethane Industry Co., Ltd.), 1.0 part by mass of the curing catalyst "Nacem Zirconium" (manufactured by Nippon Chemical Industry Co., Ltd., 1% by mass solution in acetylacetone), 240.0 parts by mass of the white pigment "NBK-967" (manufactured by Nichiko Bix Co., Ltd.), and 9.0 parts by mass of methyl isobutyl ketone (MIBK).

[0105] (Preparation of Resin Solution for Pressure-Sensitive Adhesive Layer) A resin solution for adhesive layer was prepared by mixing 100.0 parts by mass of acrylic resin (3), 6.0 parts by mass of aluminum chelate crosslinking agent "Nissetsu CK-405" (manufactured by Nippon Carbide Industries Co., Ltd.), and 37.0 parts by mass of ethyl acetate.

[0106] Example 1 The glittering colored resin solution for marking layer (1) was printed by gravure printing on a release-treated PET film (P75 6505, manufactured by Lintec Corporation) as a substrate to form a marking layer having a thickness of 4 to 5 μm.

[0107] Next, a resin solution for the first colored layer was applied to a portion of the substrate and the marking layer, and dried at 70°C for 1.5 minutes, followed by drying at 140°C for 1.5 minutes to form a first colored layer (black layer) with a thickness of 15 μm. Next, a resin solution for the second colored layer was applied to the formed first colored layer so that the thickness after drying was 60 μm, and then dried at 70°C for 3 minutes, followed by drying at 140°C for 3 minutes to form a second colored layer (white layer), thereby producing a laser-printable label. The configuration of the laser-printable label in Example 1 is shown in Table 2 above.

[0108] Furthermore, the resin solution for the adhesive layer was applied to "SLK-70AWP" (manufactured by Sumika Kakoshi Co., Ltd.) and dried at 100°C for 1.5 minutes to form an adhesive layer with a thickness of 30 μm. The above-mentioned laser-printable label was attached to this so that the surface of the second colored layer was in contact with the adhesive layer, and then the release-treated PET film was peeled off to prepare a sample.

[0109] (Examples 2 to 11 and Comparative Examples 1 to 8) Laser-printable labels were prepared in the same manner as in Example 1, except that the bright colored resin solutions for the marking layer (2) to (11) or the colored resin solutions for the marking layer (0) to (7) shown in Tables 2 and 3 below were used instead of the bright colored resin solution for the marking layer (1). Then, samples were prepared in the same manner as in Example 1 using each of the prepared laser-printable labels.

[0110] The prepared samples were subjected to the following visibility evaluation test. The results are shown in Tables 2 and 3, along with a list of the ingredients of the glitter colored resin solution for the marking layer, the resin solution for the marking layer, and the colored resin solution for the marking layer.

[0111] [Table 2]

[0112] [Table 3]

[0113] [Visibility evaluation (appearance evaluation)] The hue of the part where the marking layer was not present and the first colored layer was exposed on the surface, and the hue of the marking layer were measured using a spectrophotometer "CM-3600A" (manufactured by Konica Minolta, Inc.), and the color difference (ΔE value) and lightness difference (ΔL value) were calculated. The results are shown in Tables 2 and 3.

[0114] The appearance of the label when viewed from the front and from an oblique angle was visually compared and rated as follows. The results are shown in Tables 2 and 3. In the visual evaluation, a rating of A or B below was considered to be acceptable. A: There is a clear difference when comparing the appearance from the front and from an oblique angle. B: There is a slight difference when comparing the appearance from the front and from an oblique angle. C: Almost no difference is observed when comparing the appearance from the front and oblique views.

[0115] (result) The laser-markable labels of Examples 1 to 11, in which the marking layer was made of a resin composition containing a brilliant color pigment, showed clear or slight differences in appearance when compared from the front and oblique angles in a visibility evaluation (appearance evaluation). Therefore, the information provided on the laser-markable labels of Examples 1 to 11 was difficult to see, and could contribute to the detection of counterfeit or fake products.

[0116] On the other hand, when the marking layer was made of a resin composition that did not contain a glittering color pigment, as in the laser-markable label of Comparative Example 1, there was almost no difference in visibility evaluation (appearance evaluation) when comparing the appearance from the front and from an oblique angle. Also, when the marking layer was made of a resin composition that simply contained a coloring pigment without glitter, as in the laser-markable labels of Comparative Examples 2 to 8, there was almost no difference in visibility evaluation (appearance evaluation) when comparing the appearance from the front and from an oblique angle, as in the case of Comparative Example 1. [Industrial Applicability]

[0117] The label of the present invention makes information such as a company logo attached to the label difficult to see regardless of the environmental atmosphere, and can be used as a label that can contribute to the detection of counterfeit or fake products. [Explanation of symbols]

[0118] 10...1st colored layer 20...Second colored layer 30...Indication layer 40...Base material 50, 60, 70...resin paint 80...removal part 100,200 ···Labels L...Laser P1...Indication layer formation process P2...First colored layer formation step P3...Second colored layer formation process P4...Peeling process

Claims

1. A first colored layer; an indicator layer fitted on one surface of the first colored layer so as to have an exposed surface; a second colored layer laminated on the other surface of the first colored layer, the marking layer is made of a resin composition including a base resin, a crosslinking agent, and a brilliant color pigment; A label in which the amount of the glittering color pigment blended is 1.0 to 10.0 parts by mass per 100.0 parts by mass of the base resin constituting the marking layer.

2. 2. The label according to claim 1, wherein the average particle size of the glittering color pigment is 1.0 to 30.0 μm.

3. The label according to claim 1 or 2, wherein the base resin is an acrylic resin.

4. The label according to claim 1 or 2, wherein the crosslinking agent is an isocyanate-based crosslinking agent.

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