JP5256718B2 - Articles with transfer foil and display - Google Patents

Description

  The present invention relates to a forgery prevention technique.

  In order to prevent forgery of an article, it may be difficult to forge the article itself. For example, securities, such as banknotes and stock certificates, are applied with special display technologies such as watermarks, fine print patterns such as micro characters, and coloring of colors that are difficult to reproduce.

  When this technique is applied, it is difficult to reproduce an image by machine reading and printing, and an image that can be used for authenticity determination with the naked eye can be displayed. Therefore, by applying this technique, it is possible to make it difficult to forge an article.

  However, even for articles to which the above display technology is applied, forgery is becoming possible as digital technology advances. For this reason, the print pattern may be further refined in order to enhance the forgery prevention effect. However, if the print pattern is refined, it is difficult to determine the authenticity of the article with the naked eye.

  In order to prevent forgery of an article, an element that is difficult to forge may be attached to the article instead of or in addition to making forgery of the article itself difficult. As such an element, a display body provided with a diffraction structure such as a hologram or a diffraction grating is widely used.

  Since this display has a special visual effect, if it is attached to a genuine product, the authenticity of the article can be easily determined with the naked eye. Moreover, since it is impossible to reproduce this visual effect by printing, a relatively high forgery prevention effect can be achieved by using this display.

  By the way, as a display body provided with a diffractive structure, there is one including a metal reflective layer. A transfer foil may be used for attaching the display body to the article.

  For example, Patent Document 1 discloses a base material, a transparent resin layer formed thereon and having a relief hologram on the surface, a metal reflective layer formed thereon by vapor deposition, and a heat sensitive coating thereon. A transfer foil including an adhesive layer is described. A part of the transfer material layer including the transparent resin layer and the metal reflective layer is transferred from the base material onto the article by applying heat pressure to the transfer foil in a state where the heat-sensitive adhesive layer and the article are in contact with each other. To do. In this way, the display body made of a part of the transfer material layer is supported on the article.

  The reflective layer included in such a display body can be removed by, for example, laser beam, heat ray or electron beam irradiation or discharge breakdown. If such unauthorized processing is performed, a person who performs authenticity determination of an article using a display body (hereinafter referred to as “determination person”) looks at the display body that has been subjected to the unauthorized processing. However, without noticing that, there is a possibility that the display body is felt as a defective product, or that the display body is a non-defective product and that improper processing is not performed. In any case, the reliability of the determiner with respect to the forgery prevention effect of the display body is lowered.

In this way, when unauthorized processing that is not noticed by the judge is easy, both the user of the display body and the supplier are disadvantaged.
JP-A-61-190369

  An object of the present invention is to make it possible for a judge to easily perceive an improper processing of a metal reflective layer.

  According to the first aspect of the present invention, the substrate includes a base material and a transfer material layer that is releasably supported on one main surface of the base material, and the transfer material layer faces the main surface and transmits light. And a metal reflective layer facing the whole or a part of one main surface of the base material with the light transmissive layer interposed therebetween, and the light transmissive layer absorbs light from the transparent resin and generates heat. Containing a light absorbing material that is irreversibly blackened by irradiation with a laser beam, or containing a transparent resin and a heat-sensitive coloring material that causes an irreversible color change by heating to a temperature higher than the discoloration temperature. A transfer foil is provided.

  According to the second aspect of the present invention, the substrate includes a base material and a transfer material layer that is releasably supported on one main surface of the base material, and the transfer material layer faces the main surface and transmits light. And a metal reflective layer facing the whole or part of one main surface of the base material with the light transmissive layer interposed therebetween, the light transmissive layer absorbing light and a transparent resin. There is provided a transfer foil characterized by containing a light-absorbing material that generates heat and a heat-sensitive coloring material that causes an irreversible color change when heated to a temperature higher than the color change temperature.

  According to the third aspect of the present invention, it is characterized in that it comprises an article as a body to be transferred and a display body pasted on the article by transfer using the transfer foil according to the first or second side. An article with a display body is provided.

  According to a fourth aspect of the present invention, it comprises an article and a display body supported by the article, the display body facing a part or all of one main surface of the article, A light-transmitting layer and a metal reflective layer interposed between the article, the light-transmitting layer containing a transparent resin and a light-absorbing material that absorbs light and generates heat, and is irreversible by irradiation with a laser beam. Or a heat-sensitive coloring material that causes an irreversible color change by heating to a temperature higher than the color change temperature. .

  According to a fifth aspect of the present invention, it comprises an article and a display body supported by the article, wherein the display body faces a part or all of one main surface of the article, and And a metal reflective layer interposed between the light transmissive layer and the article, wherein the light transmissive layer is heated to a temperature higher than the discoloration temperature, a transparent resin, a light absorbing material that absorbs light and generates heat. And a thermosensitive coloring material that causes irreversible color change.

  According to the present invention, it is possible to make it easy for a determiner to perceive an improper process on a metal reflective layer.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In addition, the same referential mark is attached | subjected to the component which exhibits the same or similar function through all the drawings, and the overlapping description is abbreviate | omitted.

  FIG. 1 is a plan view schematically showing a transfer foil according to one embodiment of the present invention. FIG. 2 is a cross-sectional view taken along the line II-II of the transfer foil shown in FIG.

  The transfer foil 10 shown in FIGS. 1 and 2 has a length direction parallel to the X direction, a width direction parallel to the Y direction orthogonal to the X direction, and a thickness direction orthogonal to the X direction and Y direction. It has a strip shape parallel to the Z direction. The transfer foil 10 may have a shape other than the band shape.

  As shown in FIG. 2, the transfer foil 10 includes a base material 110, a transfer material layer 120, and an adhesive layer 130.

  The base material 110 is, for example, a film or sheet made of resin. The substrate 110 may have a single layer structure or a multilayer structure. As a material of the base material 110, for example, a polyethylene terephthalate resin, a polyethylene naphthalate resin, a polyimide resin, a polyethylene resin, a polypropylene resin, or a vinyl chloride resin can be used. When a polyethylene terephthalate resin is used, a substrate 110 that is particularly excellent in heat resistance and thickness uniformity can be obtained.

  The substrate 110 may be treated and / or processed. For example, the base material 110 may be subjected to processing and / or processing such as antistatic processing, mat processing, embossing, printing, and laser marking.

  A transfer material layer 120 is formed on the substrate 110. The transfer material layer 120 is detachably supported on one main surface of the substrate. The transfer material layer 120 may be provided on one whole main surface of the substrate 110 or may be provided only on a part thereof.

  The transfer material layer 120 includes a peeling protective layer 1201, a diffraction structure forming layer 1202, a metal reflective layer 1203, and a printing pattern (not shown).

  The peeling protective layer 1201 is formed on one main surface of the substrate 110. The peeling protective layer 1201 can be formed on the base 110 using a coating method such as a gravure printing method and a micro gravure method.

  The peeling protection layer 1201 plays a role of stabilizing the peeling of the transfer material layer 120 from the substrate 110 and protecting the diffraction structure forming layer 1202 after transfer. In addition, when the peel protection layer 1201 is illegally removed from the display body obtained by using the transfer foil 10, a part or all of the metal reflection layer 1203 is illegally removed, the judge determines that the unauthorized processing has been performed. It plays a role in making it easy to perceive.

  Specifically, when a part or all of the metal reflective layer 1203 is illegally removed from the display body by, for example, laser beam, heat ray or electron beam irradiation or discharge breakdown, the protective layer 1201 is irreversibly at that position. Color changes. The judge perceives that the display body has been tampered with by visually recognizing the protective layer 1201 that has caused this irreversible color change. This will be described in more detail later with reference to the drawings.

  As a material of the peeling protection layer 1201, for example, a mixture containing a transparent resin and a light absorbing material can be used. Alternatively, a mixture containing a transparent resin and a heat-sensitive colorant can be used as the material for the peel protection layer 1201. Alternatively, a mixture containing a transparent resin, a light absorbing material, and a heat-sensitive coloring material can be used as the material for the peeling protection layer 1201.

  As the transparent resin, for example, a thermoplastic resin, a thermosetting resin, a moisture curable resin, or an ultraviolet ray or an electron beam curable resin can be used. For example, acrylic resin, polyester resin, or polyamideimide resin can be used as the transparent resin.

  As the light absorbing material, a substance that absorbs light and generates heat can be used. As such a light absorbing material, for example, an infrared absorbing material, an ultraviolet absorbing material, or a mixture thereof can be used.

  Examples of infrared absorbers include carbon materials such as carbon black, organic metal complexes such as phthalocyanine, azo, and thioamide, organic systems such as diiminium, anthraquinone, polymethine, azurenium, squarilium, and thiopyrylium. An infrared absorbing material or a mixture thereof can be used.

Examples of the ultraviolet absorber include salicylic acid-based ultraviolet absorbers such as phenyl salicylate, p-tert-butylphenyl salicylate and p-octylphenyl salicylate, 2,4-dihydroxybenzophenone, 2-hydroxybenzophenone, 2-hydroxy-4- Octoxybenzophenone, 2-hydroxy-4-dodecyloxybenzophenone, 2,2′-dihydroxy-4-methoxybenzophenone, 2,2′-dihydroxy-4,4′-dimethoxybenzophenone and 2-hydroxy-4-methoxy-5 -Benzophenone ultraviolet absorbers such as sulfobenzophenone, 2- (2'-hydroxy-5'-methylphenyl) benzotriazole, 2- (2'-hydroxy-5'-tert-butylphenyl) benzotriazole, 2- ( 2 Benzotriazole-based UV absorbers such as '-hydroxy-3'-tert-butyl-5'-methylphenyl) benzotriazole and 2- (2'-hydroxy-3', 5'-ditert-amylphenyl) benzotriazole , Cyanoacrylate ultraviolet absorbers such as 2-ethylhexyl-2-cyano-3,3′-diphenyl acrylate and ethyl-2-cyano-3,3-diphenyl acrylate, or a mixture thereof. Alternatively, the UV absorber may be used inorganic ultraviolet shielding material made of fine powder such as TiO ₂ and ZnO.

  When the light absorbing material is used, the content thereof is, for example, in the range of about 0.1 parts by mass to about 20 parts by mass with respect to 100 parts by mass of the composition constituting the peeling protective layer 1201. If this content is small, heat generation upon irradiation with a laser beam becomes insufficient, and there is a possibility that the color change of the light irradiation portion is difficult to occur. If this content is excessively large, the peel protection layer 1201 may have insufficient performance such as transparency and durability.

  As the heat-sensitive colorant, a heat-sensitive colorant that causes an irreversible color change by heating to a temperature higher than the color change temperature is used. This heat-sensitive coloring material may change from colorless to colored by heating to a temperature higher than the color changing temperature, or may change from colored to colorless, or from one color to another. May be.

  As the heat-sensitive coloring material, a material that does not cause a color change in the production and thermal transfer of the transfer foil 10 and in the normal use environment of the display body obtained using the transfer foil 10 is used. That is, as the heat-sensitive colored layer, a layer having a higher coloring temperature than at least the glass transition temperature of the heat-sensitive adhesive constituting the adhesive layer 130 is used. Accordingly, the color change temperature of the heat-sensitive adhesive is, for example, about 200 ° C. or higher.

  As the heat-sensitive coloring material, typically, a material known as a temperature indicating paint can be used. For example, a thermochromic organic dye, a metal complex crystal, or a mixture of an electron-donating color-forming compound, an electron-accepting compound, and a polar organic compound can be used as the heat-sensitive colorant. A mixture of these may be used as the heat-sensitive colorant.

  When the heat-sensitive coloring material is used, the content thereof is, for example, in the range of about 0.1 parts by mass to about 20 parts by mass with respect to 100 parts by mass of the composition constituting the peeling protective layer 1201. If this content is small, heat generation upon irradiation with a laser beam becomes insufficient, and there is a possibility that the color change of the light irradiation portion is difficult to occur. If this content is excessively large, the peel protection layer 1201 may have insufficient performance such as transparency and durability.

  A lubricant may be further added to the peeling protective layer 1201. This improves the wear resistance of the peel protection layer 1201. As the lubricant, for example, a wax such as polyethylene powder or carnauba wax can be used. When the peeling protective layer 1201 is 100 parts by mass, the content of the lubricant in the peeling protective layer 1201 is, for example, in the range of 0.1 parts by mass to 20 parts by mass.

  The diffraction structure forming layer 1202 is formed on the peeling protection layer 1201. A relief type diffractive structure is provided on the surface of the diffractive structure forming layer 1202. This diffractive structure constitutes a hologram and / or a diffraction grating.

  The diffractive structure may be provided on the entire surface of the diffractive structure forming layer 1202 or may be provided only on a part thereof. Here, as an example, it is assumed that the diffractive structure is provided on the entire surface of the diffractive structure forming layer 1202. In this case, a portion of the surface of the diffractive structure forming layer 1202 corresponding to the region surrounded by the broken line in FIG. 1 is provided with a diffractive structure different from the diffractive structures provided in other portions. And

  The diffraction structure forming layer 1202 is made of a transparent material such as a transparent resin. As this transparent resin, for example, a thermoplastic resin, thermosetting, or ultraviolet or electron beam curable resin can be used. As the thermoplastic resin, for example, an acrylic resin, an epoxy resin, a cellulose resin, or a vinyl resin can be used. As the thermosetting resin, for example, a urethane resin, a melamine resin, or a phenol resin obtained by adding a polyisocyanate as a cross-linking agent to a polyol having a reactive hydroxyl group such as an acrylic polyol and a polyester polyol to cross-link it is used. be able to. As the ultraviolet or electron beam curable resin, for example, an epoxy acrylic resin, an epoxy methacrylic resin, a urethane acrylate resin, or a urethane methacrylate resin can be used.

  The diffractive structure forming layer 1202 is obtained, for example, by forming a photosensitive resin layer on the peeling protection layer 1201 and recording the diffractive structure on the photosensitive resin layer. For example, using a two-beam interference method, two light beams that interfere with each other are irradiated on the photosensitive resin layer to generate interference fringes on the surface thereof. Thereafter, the diffractive structure forming layer 1202 can be obtained by subjecting the photosensitive resin layer to post-treatment such as development and drying. When this method is used, for example, a stereoscopic image and / or an image that changes according to the observation direction (hereinafter referred to as a “changing image”) is displayed on the display body obtained using the transfer foil 10. Can do.

The diffractive structure forming layer 1202 can also be obtained by other methods.
For example, an electron beam curable resin layer is formed on the peeling protection layer 1201, and the electron beam curable resin layer is drawn using an electron beam. Thereafter, the diffraction structure forming layer 1202 can be obtained by subjecting the electron beam curable resin layer to post-treatment such as development and drying. When this method is used, the shape of the drawing pattern is not limited, and for example, a stereoscopic image and / or changing image can be displayed on the display body obtained by using the transfer foil 10. Further, according to this method, it is possible to divide the display area of the display body into a plurality of pixels and determine the diffraction structure to be adopted for each pixel based on the image to be displayed on the display body. That is, according to this method, the design of the transfer foil 10 is facilitated. Note that the shape of each pixel viewed from the Z direction may have any shape. For example, the shape of each pixel viewed from the Z direction may be a quadrangle, a circle, or a star.

Alternatively, the diffractive structure forming layer 1202 may be formed using an induced surface relief forming method. For example, an amorphous film containing a polymer having azobenzene on the chain side is formed on the peeling protection layer 1201. Next, the amorphous film is irradiated with a relatively weak light of about several tens mW / cm ² having a wavelength in the range of blue to green. As a result, the polymer molecules are moved by several μm to form an uneven structure on the surface of the amorphous film. By utilizing such a phenomenon, the diffractive structure forming layer 1202 can be obtained.

  Alternatively, the diffractive structure forming layer 1202 may be formed using transfer. For example, first, an original plate having a concavo-convex structure on the transfer surface is formed by the method exemplified for the diffraction structure forming layer 1202. Next, a metal layer is formed on the transfer surface of the original by, for example, electroforming. A mold is obtained by removing the original from the metal layer. Thereafter, the pattern of this mold is transferred to a thermoplastic resin or ultraviolet or electron beam curable resin layer to produce a plurality of plates, and a plurality of molds are produced from these plates by electroforming. The concavo-convex structure of the mold thus obtained is transferred to a thermoplastic resin or ultraviolet or electron beam curable resin layer, whereby a diffractive structure forming layer 1202 having a concavo-convex structure as a diffractive structure on one main surface is provided. Can be obtained.

  Note that here, the diffractive structure forming layer 1202 provided with the relief type diffractive structure is illustrated, but other structures may be adopted for the diffractive structure forming layer 1202. For example, the diffractive structure forming layer 1202 may be an image hologram, a Lippmann hologram, a rainbow hologram, or an integral hologram.

  The diffraction structure forming layer 1202 may be omitted. Alternatively, a polymer liquid crystal layer may be formed instead of or in addition to the diffractive structure forming layer 1202. When the polymer liquid crystal layer is provided, for example, a latent image can be formed using the birefringence thereof.

  The metal reflection layer 1203 is formed on the diffraction structure forming layer 1202. The metal reflective layer 1203 faces the entire main surface of one side of the substrate 110 with the peeling protective layer 1201 and the diffraction structure forming layer 1202 interposed therebetween.

  The metal reflection layer 1203 covers the entire surface of the diffraction structure forming layer 1202 on which the concavo-convex structure is provided. A concavo-convex structure corresponding to the concavo-convex structure of the diffractive structure forming layer 1202 is provided on the contact surface of the metal reflective layer 1203 with the diffractive structure forming layer 1202. The concavo-convex structure of the metal reflective layer 1203 constitutes a relief type diffractive structure. That is, the metal reflection layer 1203 plays a role of increasing the visual effect derived from the diffractive structure.

  The metal reflection layer 1203 is made of a single metal or an alloy. As a material of the metal reflective layer 1203, for example, aluminum, tin, chromium, nickel, copper, gold, or brass can be used.

  When the diffractive structure forming layer 1202 is not provided with an uneven structure as a diffractive structure, for example, when the diffractive structure forming layer 1202 is a Lippmann hologram, the diffractive structure forming layer 1202 and the metal reflecting layer 1203 are in contact with each other. It does not have to be. That is, a transparent layer may be interposed between them.

  The metal reflective layer 1203 can be formed by, for example, a vapor deposition method such as a vacuum evaporation method or a sputtering method. The thickness of the metal reflective layer 1203 is, for example, in the range of about 5 nm to about 1000 nm.

  A print pattern (not shown) is formed on the diffraction structure forming layer 1202. The print pattern may be interposed between the peeling protective layer 1201 and the diffractive structure forming layer 1202. Alternatively, a part of the printing pattern may be interposed between the peeling protective layer 1201 and the diffraction structure forming layer 1202 and the other part may be formed on the diffraction structure forming layer 1202.

  As a material for the printing pattern, for example, process ink can be used. A special ink containing a material having special optical characteristics such as a phosphor may be used as a material for the printing pattern.

  The printed pattern may have a shape that gives decoration or an aesthetic effect to the display body such as a figure, a pattern, and a pattern, or may have a shape that displays information such as letters, numbers, and symbols. Good.

  Instead of the printing pattern, for example, a printing layer as a transparent continuous film may be formed between the peeling protective layer 1201 and the diffraction structure forming layer 1202. Alternatively, the print pattern may be omitted.

  The transfer material layer 120 may further include layers other than those described above. For example, an anchor coat layer may be interposed between two adjacent layers to improve their adhesion. The anchor coat layer can be formed, for example, between the peeling protective layer 1201 and the diffraction structure forming layer 1202 or between the metal reflective layer 1203 and the adhesive layer 130. As a material for the anchor coat layer, for example, acrylic resin, vinyl chloride-vinyl acetate copolymer, epoxy resin, polyvinyl alcohol resin, and ethylene-vinyl alcohol copolymer can be used.

  The adhesive layer 130 covers the transfer material layer 120. The adhesive layer 130 includes, for example, a heat-sensitive adhesive that develops tackiness when heat is applied. As the heat-sensitive adhesive, for example, thermoplastic resins such as acrylic resin, vinyl chloride-vinyl acetate copolymer, epoxy resin, and ethylene-vinyl alcohol copolymer can be used. The adhesive layer 130 is obtained, for example, by applying a coating liquid containing the above-described resin onto the transfer material layer 120.

  FIG. 3 is a plan view schematically showing an example of an article with a display body obtained by transfer using the transfer foil shown in FIGS. 1 and 2. FIG. 4 is a cross-sectional view taken along line IV-IV of the article with a display body shown in FIG.

  This display article-equipped article 20 includes an article 210 as a transfer object, a display body 220, and an adhesive layer 230 interposed therebetween. In the example shown in FIG.3 and FIG.4, the articles | goods 20 with a display body are gift certificates.

  The article 210 is a printed material in this example. The article 210 includes a base material 2101 and a printed pattern 2102 formed thereon. The substrate 2101 typically includes paper. Plastic or synthetic paper may be used as the material of the substrate 2101.

  The display body 220 is supported by the article 210. The display body 220 is a part of the transfer material layer 120 described with reference to FIGS. 1 and 2. The display body 220 includes a peeling protective layer 1201, a diffraction structure forming layer 1202, a metal reflective layer 1203, and the above-described printed pattern 1205. The metal reflective layer 1203 faces the article 220. Note that the diffractive structure forming layer 1202 and the print pattern 1205 can be omitted.

  The adhesive layer 230 bonds the display body 220 and the article 210 together. The adhesive layer 230 is a part of the adhesive layer 130 described with reference to FIGS. 1 and 2.

  The display-attached article 20 may be a securities other than gift certificates such as stock certificates. Alternatively, the display-equipped article 20 may be an authentication medium such as a cash card, a credit card, and a passport. Or the article 20 with a display body may be a work of art, a craft, a tag, or a packaging material to which the display body is attached.

This display-equipped article 20 can be manufactured, for example, by the following method.
First, the transfer foil 10 and the article 210 shown in FIGS. 1 and 2 are arranged so that the adhesive layer 130 of the transfer foil 10 faces the article 210. Next, the transfer foil 10 is pressed against the article 210 and the portion of the transfer foil 10 that is in contact with the article 210 is heated. When the transfer foil 10 is heated, the adhesive layer 130 exhibits tackiness at the heated portion. As a result, the transfer material layer 120 adheres to the article 210 via the adhesive layer 130. Thereafter, the transfer foil 10, particularly the base material 110 is peeled from the article 210. As a result, the transfer material layer 120 is broken along the outline of the previous heating portion, and the transfer foil 10 is peeled off from the article 210 while leaving the heating portion of the transfer material layer 120 on the article 210. As described above, the display article-equipped article 20 including the previous heating unit as the display body 220 is obtained.

  Even if the display object-equipped article 20 is improperly processed into the metal reflective layer 1203, the determiner can easily perceive it. This will be described with reference to FIGS.

  FIG. 5 is a plan view schematically illustrating an example of an article with a display body in which unauthorized processing is performed on the metal reflective layer. 6 is a cross-sectional view taken along the line VI-VI of the article with a display body shown in FIG.

When unauthorized processing is performed on the metal reflective layer 1203 of the display article-equipped article 20 shown in FIGS. 3 and 4, for example, using a laser such as an Nd: YAG laser or a CO ₂ gas laser, the metal reflective layer is formed from the peeling protective layer 1201 side. A laser beam is emitted toward 1203. Thereby, as shown in FIG. 6, the metal reflective layer 1203 is removed from the irradiation part irradiated with the laser beam LB of the display body 220.

  When the metal reflective layer 1203 is removed from the irradiated portion by irradiation with the laser beam LB, an irreversible color change occurs in the peeling protective layer 1201 in the removed portion. For example, when the peel protection layer 1201 contains a heat-sensitive coloring material, at least a part of the heat-sensitive coloring material is heated to cause an irreversible color change, whereby the color of the peel protection layer 1201 is changed at the irradiated portion. It changes irreversibly. Further, when the peeling protective layer 1201 contains a light absorbing material without containing a heat-sensitive coloring material, for example, if the content of the light absorbing material is sufficiently large, the peeling protective layer 1201 is irreversibly blackened at the irradiated portion. . By judging the color of the portion 1201 ′ where the color change of the peeling protective layer 1201 is exhibited with the color of the other portion, the determiner perceives that the unauthorized processing has been performed.

  As described above, when the unauthorized processing is performed, the display-attached article 20 is formed with the trace of the unauthorized processing that can be easily perceived by the determiner. Therefore, it can suppress that the reliability of the determination person with respect to the forgery prevention effect which the display body 220 has falls.

  Moreover, in this display-equipped article 20, the protective layer 1201 positioned on the front side of the reflective layer 1203 contains a heat-sensitive coloring material and / or a light absorbing material. Therefore, when the protective layer 1201 is colored by the addition of a heat-sensitive coloring material and / or a light absorbing material, the color of the protective layer 1201 affects the display. However, the protective layer 1201 is provided over the entire front surface of the display body 220. The concentration of the heat-sensitive coloring material and / or the light absorbing material is uniform in the protective layer 1201. Therefore, it is difficult to realize that a heat-sensitive coloring material and / or a light absorbing material is used for the adhesive layer 230.

In addition, although the illegal processing by laser beam irradiation was demonstrated here, this display body 220 exhibits the effect similar to the above-mentioned also with respect to the illegal processing by heat ray or electron beam irradiation, or electric discharge destruction.
The transfer foil 10 described above can be variously modified.

  FIG. 7 is a plan view schematically showing a modification of the transfer foil shown in FIGS. 1 and 2. 8 is a cross-sectional view taken along line VIII-VIII of the transfer foil shown in FIG.

  The transfer foil 10 shown in FIGS. 7 and 8 has the same structure as the transfer foil 10 described with reference to FIGS. 1 and 2 except that the following configuration is adopted. That is, in this transfer foil 10, the metal reflective layer 1203 is patterned. In the transfer foil 10, the transfer material layer 120 further includes a chemical-resistant protective layer 1204.

  The metal reflective layer 1203 may have any shape. For example, the metal reflective layer 1203 may have a shape that gives decoration or an aesthetic effect to the display body, such as a figure, a pattern, and a pattern, and has a shape that displays information such as letters, numbers, and symbols. You may do it.

  The chemical resistant protective layer 1204 has the same shape as the metal reflective layer 1203. The chemical-resistant protective layer 1204 covers the entire back surface of the metal reflective layer 1203 facing the diffractive structure forming layer 1202.

  The chemical resistant protective layer 1204 serves as an etching mask when the patterned metal reflective layer 1203 is formed. This will be described in detail later.

The chemical resistant protective layer 1204 contains, for example, a resin. As this resin, a resin having a relatively high glass transition temperature (T _g ), for example, a glass transition temperature of about 150 ° C. or more can be used. Examples of such resins include polycarbonate resins (T _g = 140 ° C. to 150 ° C.), polyarylate resins (T _g = 193 ° C.), polysulfone resins (T _g = 190 ° C.), polyether sulfone resins (T _g = 225 ° C.), polyetherimide resin (T _g ≧ 200 ° C.), cyclic polyolefin copolymer (T _g = 171 ° C.), modified norbornene resin (T _g = 171 ° C.), polyamideimide resin (T _g ≧ 200). ° C) and polyimide resins (T _g ≧ 250 ° C.). Alternatively, as such a resin, a thermosetting resin, a moisture curable resin, or an ultraviolet ray or an electron beam curable resin may be used.

  The chemical resistant protective layer 1204 may further contain other materials such as a filler. However, if the total content of components other than the resin increases, the composition of the chemical-resistant protective layer 1204 tends to be non-uniform, and as a result, the mechanical strength and / or heat resistance of the chemical-resistant protective layer 1204 is insufficient. May be. Moreover, when the total content of components other than the resin increases, the fluidity of the coating liquid used for forming the chemical-resistant protective layer 1204 decreases. If the fluidity of the coating solution is low, when the chemical-resistant protective layer 1204 is formed using a plate, the coating solution may be dried on the plate and printability may be deteriorated. And when the total content of components other than resin is large, it is easy to produce aggregation or sedimentation of solid content at the time of storage of a coating liquid or at the time of coating. The ratio of other components to the resin contained in the chemical-resistant protective layer 1204 is, for example, 40% by mass or less.

  The metal reflective layer 1203 and the chemical resistant protective layer 1204 are formed by the following method, for example.

  First, a metal layer made of a single metal or an alloy is formed on the diffractive structure forming layer 1202. For the formation of the metal layer, for example, a vapor deposition method such as a vacuum evaporation method or a sputtering method can be used. The thickness of this metal layer is, for example, in the range of about 5 nm to about 1000 nm.

  Next, a chemical-resistant protective layer 1204 is formed on the metal layer. The chemical-resistant protective layer 1204 can be formed by, for example, a printing method using a coating liquid containing a resin as ink. Alternatively, the chemical-resistant protective layer 1204 may be formed by forming a photosensitive resin layer on the metal layer and subjecting the photosensitive resin layer to pattern exposure and development processing.

  Thereafter, the metal layer is etched using the chemical resistant protective layer 1204 as an etching mask. Specifically, an alkaline or acidic etching solution is applied to the metal layer, and the exposed portion is dissolved in the etching solution. For example, a structure including a laminate of a metal layer and a chemical resistant protective layer 1204 is immersed in a 1.5N sodium hydroxide aqueous solution. The temperature of the sodium hydroxide aqueous solution is, for example, 40 ° C. to 50 ° C. The immersion time is, for example, 5 seconds to 30 seconds. In this way, a patterned metal reflective layer 1203 is obtained. Note that the chemical-resistant protective layer 1204 may be removed after the patterning of the metal layer.

  FIG. 9 is a plan view schematically showing an example of an article with a display body obtained by transfer using the transfer foil shown in FIGS. 7 and 8. FIG. 10 is a cross-sectional view taken along line XX of the article with a display body shown in FIG.

  3 and 4 except that the display body 220 and the adhesive layer 230 are part of the transfer material layer 120 and the adhesive layer 130 described with reference to FIGS. 7 and 8. It has the structure similar to the articles | goods 20 with a display body demonstrated referring FIG. This display-attached article 20 can be manufactured by the same method as described with reference to FIGS. 3 and 4 except that the transfer foil 10 shown in FIGS. 7 and 8 is used.

  FIG. 11 is a plan view schematically showing another example of an article with a display body in which a tampering process is performed on a metal reflective layer. 12 is a cross-sectional view of the article with a display body shown in FIG. 11 along the line XII-XII.

When performing unauthorized processing on the metal reflective layer 1203 of the display-equipped article 20 shown in FIGS. 9 and 10, for example, using a laser such as an Nd: YAG laser or a CO ₂ gas laser, the metal reflective layer is formed from the peeling protective layer 1201 side. A laser beam is emitted toward 1203. Thereby, as shown in FIG. 12, the metal reflection layer 1203 is removed from the irradiation part irradiated with the laser beam LB of the display body 220.

  When the metal reflective layer 1203 is removed from the irradiated portion by irradiation with the laser beam LB, an irreversible color change occurs in the peeling protective layer 1201 in this removed portion, as described with reference to FIGS. . Therefore, it can suppress that the reliability of the determination person with respect to the forgery prevention effect which the display body 220 has falls.

  Moreover, in this display body 10, although the protective layer 1201 located in the front side of the reflective layer 1203 contains a heat-sensitive coloring material and / or a light absorbing material, the protective layer 1201 extends over the entire front surface of the display body 220. Is provided. The concentration of the heat-sensitive coloring material and / or the light absorbing material is uniform in the protective layer 1201. Therefore, it is difficult to realize that a heat-sensitive coloring material and / or a light absorbing material is used for the adhesive layer 230.

  Further, in this display body 10, although the metal reflective layer 1203 is patterned, the heat-sensitive coloring material and / or the light absorbing material are uniformly contained in the non-patterned peeling protective layer 1201. Therefore, unlike the case where the patterned layer contains a heat-sensitive coloring material and / or a light absorbing material, an effect that makes it easy for a judge to perceive that unauthorized processing has been performed without considering alignment. Can be obtained.

  In addition, although the illegal processing by laser beam irradiation was demonstrated here, this display body 220 exhibits the effect similar to the above-mentioned also with respect to the illegal processing by heat ray or electron beam irradiation, or electric discharge destruction.

  As described above, the case where the heat-sensitive coloring material and / or the light absorbing material are included in the peeling protective layer 1201 has been described. However, the heat-sensitive coloring material and / or the light absorbing material are other light-transmitting layers facing the front surface of the metal reflective layer 1203. May be included. For example, the diffractive structure forming layer 1202 may include a heat-sensitive coloring material and / or a light absorbing material. Alternatively, when an anchor coat layer is provided between the peeling protective layer 1201 and the diffraction structure forming layer 1202, the anchor coat layer may contain a heat-sensitive coloring material and / or a light absorbing material. Or when the printing layer as a transparent continuous film is provided over the whole between the peeling protection layer 1201 and the diffraction structure formation layer 1202, this printing layer contains a heat-sensitive coloring material and / or a light absorbing material. Also good.

  The layer containing the heat-sensitive coloring material and / or the light absorbing material is a continuous film which is typically not provided with an opening, but is a mesh-like film, a stripe-like film or a film composed of a large number of dots spaced from each other. The film | membrane with which opening was provided like this may be sufficient. However, as the size or density of the opening increases, the effect of allowing the determiner to easily perceive that unauthorized processing has been performed decreases.

Examples of the present invention will be described below.
(Example 1)
The transfer foil 10 shown in FIGS. 1 and 2 was manufactured by the following method. In this example, the print pattern 1205 is omitted.

  First, a transparent polyethylene terephthalate film having a thickness of 25 μm was prepared as the substrate 110.

Next, an ink having the composition shown in Table 1 was applied on one main surface of the substrate 110, and the coating film was dried. In this way, a peeling protective layer 1201 having a thickness of 2 μm was formed on the substrate 110.

Subsequently, the ink which has a composition shown in Table 2 was apply | coated on the peeling protection layer 1201, and this coating film was dried. Thus, a thermoplastic resin layer having a thickness of 1 μm was obtained. Furthermore, a diffractive structure forming layer 1202 having a concavo-convex structure as a diffractive structure on the surface was formed by pressing a press plate while applying heat to the thermoplastic resin layer.

  Thereafter, an aluminum layer having a thickness of 50 nm was formed on the entire surface of the diffraction structure forming layer 1202 by vacuum deposition.

Further, an ink having a composition shown in Table 3 was printed on the diffractive structure forming layer 1202 and the metal reflective layer 1203 to form an adhesive layer 130 having a thickness of 3 μm. As described above, the transfer foil 10 shown in FIGS. 1 and 2 was completed.

  Next, using this transfer foil 10, an article with a display body 20 shown in FIGS. 3 and 4 was produced by the following method.

  That is, an article 20 having a printing pattern 2102 formed on a base material 2101 made of paper was prepared. A portion of the transfer material layer 120 was transferred from the substrate 110 onto the substrate 2101 using a hot roll transfer machine. Specifically, the article 20 and the transfer foil 10 were overlapped so that the adhesive layer 130 faced the article 20, and heat and pressure were applied thereto using a heat roll set at 120 ° C. Immediately after application of heat and pressure, the substrate 110 was peeled from the substrate 2101. As described above, the display article-equipped article 20 shown in FIGS. 3 and 4 was completed.

  Next, a part of the metal reflection layer 1203 was removed by irradiating the metal reflection layer 1203 with a laser beam having a wavelength of 1064 nm from the peeling protective layer 1201 side. Here, the laser output was set to 2W. When the article with the display body 20 is observed, as shown in FIG. 5, a portion 1201 ′ in which an irreversible color change occurs at a position corresponding to the laser beam irradiation portion can be visually recognized, and the metal reflection layer 1203. It was easy to perceive that a part of was removed.

(Example 2)
The transfer foil 10 shown in FIGS. 7 and 8 was manufactured by the following method. In this example, the print pattern 1205 is omitted.

  First, a peeling protective layer 1201, a diffraction structure forming layer 1202, and an aluminum layer were formed in this order on the substrate 110 by the same method as described in Example 1.

Next, the ink which has a composition shown in Table 4 was pattern-printed on this aluminum layer. As a result, a chemical-resistant protective layer 1204 having a thickness of 1 μm was obtained.

  Next, the structure thus obtained was immersed in a 1.5N aqueous sodium hydroxide solution kept at 50 ° C. for 10 seconds. Thereby, the part which is not coat | covered with the chemical-resistant protective layer 1204 among the aluminum layers was removed. Subsequently, the structure was sequentially subjected to neutralization, water washing and drying treatment. The neutralization treatment was performed by immersing the previous structure in a 0.1N hydrochloric acid aqueous solution. In this way, a metal reflection layer 1203 having the same pattern shape as the chemical-resistant protective layer 1204 was obtained.

  Thereafter, an ink having a composition shown in Table 3 above was printed on the diffraction structure forming layer 1202 and the metal reflective layer 1203 to form an adhesive layer 130 having a thickness of 3 μm. As described above, the transfer foil 10 shown in FIGS. 7 and 8 was completed.

  Subsequently, an article 20 with a display body shown in FIGS. 9 and 10 was manufactured by the same method as in Example 1 except that this transfer foil 10 was used.

  Next, a part of the metal reflection layer 1203 was removed by irradiating the metal reflection layer 1203 with a laser beam having a wavelength of 1064 nm from the peeling protective layer 1201 side. Here, the laser output was set to 2W. When the article with the display body 20 is observed, as shown in FIG. 5, a portion 1201 ′ in which an irreversible color change occurs at a position corresponding to the laser beam irradiation portion can be visually recognized, and the metal reflection layer 1203. It was easy to perceive that a part of was removed.

The top view which shows roughly the transfer foil which concerns on 1 aspect of this invention. Sectional drawing along the II-II line of the transfer foil shown in FIG. The top view which shows roughly an example of the articles | goods with a display body obtained by the transfer using the transfer foil shown in FIG.1 and FIG.2. Sectional drawing along the IV-IV line of the article | item with a display body shown in FIG. The top view which shows roughly an example of the articles | goods with a display body by which the unauthorized process was performed to the metal reflective layer. Sectional drawing along the VI-VI line of the article | item with a display body shown in FIG. The top view which shows roughly the modification of the transfer foil shown in FIG.1 and FIG.2. Sectional drawing along the VIII-VIII line of the transfer foil shown in FIG. The top view which shows roughly an example of the articles | goods with a display body obtained by transcription | transfer using the transfer foil shown in FIG.7 and FIG.8. Sectional drawing along XX of the article | item with a display body shown in FIG. The top view which shows roughly the other example of the articles | goods with a display body by which the unauthorized process was performed to the metal reflective layer. Sectional drawing along the XII-XII line of the article | item with a display body shown in FIG.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 ... Transfer foil, 20 ... Display-equipped article, 110 ... Base material, 120 ... Transfer material layer, 130 ... Adhesive layer, 210 ... Article, 220 ... Display body, 230 ... Adhesive layer, 1201 ... Release protection layer, 1201 ' ... Discoloration part, 1202 ... Diffraction structure forming layer, 1203 ... Metal reflection layer, 1204 ... Chemical-resistant protective layer, 1205 ... Print pattern, 2101 ... Base material, 2102 ... Print pattern.

Claims (9)

  A transfer material layer releasably supported on one main surface of the substrate, the transfer material layer having a light transmission layer facing the main surface and the light transmission layer interposed therebetween A metal reflective layer facing the whole or a part of one main surface of the base material sandwiched between, the light transmission layer contains a transparent resin and a light absorbing material that absorbs light and generates heat, and A transfer characterized in that it contains a transparent resin and a heat-sensitive coloring material that causes an irreversible color change by heating to a temperature higher than the color change temperature by irreversibly blacking upon irradiation with a laser beam. Foil.   A transfer material layer releasably supported on one main surface of the substrate, the transfer material layer having a light transmission layer facing the main surface and the light transmission layer interposed therebetween A metal reflection layer facing the whole or a part of one main surface of the base material between the transparent resin, a light absorbing material that absorbs light and generates heat, and a color change temperature. A transfer foil comprising a heat-sensitive coloring material that causes an irreversible color change by heating to a higher temperature.   The transfer foil according to claim 1, wherein the light transmission layer is a peeling protective layer adjacent to the substrate.   The transfer material layer is interposed between the metal reflective layer and the peeling protective layer, and a relief type diffractive structure is provided on a main surface on the metal reflective layer side, and a diffractive structure forming layer made of a transparent material is further provided. It contains, The transfer foil of Claim 3 characterized by the above-mentioned.   The transfer foil according to claim 1, further comprising an adhesive layer that covers the transfer material layer.   The transfer foil according to claim 1, wherein the transfer material layer further includes a print pattern and / or an anchor coat layer.   A display body comprising: an article as a body to be transferred; and a display body pasted on the article by transfer using the transfer foil according to any one of claims 1 to 6. Goods.   An article and a display body supported by the article, wherein the display body is a light transmission layer facing a part or all of one main surface of the article, and between the light transmission layer and the article. A light reflecting layer that contains a transparent resin and a light absorbing material that generates heat by absorbing light and is irreversibly blackened by irradiation with a laser beam, or transparent An article with a display, comprising: a resin and a heat-sensitive coloring material that causes an irreversible color change by heating to a temperature higher than the color change temperature.   An article and a display body supported by the article, wherein the display body is a light transmission layer facing a part or all of one main surface of the article, and between the light transmission layer and the article. A light reflecting layer that absorbs light and generates heat, and heat sensitive to cause an irreversible color change by heating to a temperature higher than the discoloration temperature. An article with a display body, characterized by containing a coloring material.

Images