JP2012192586A - Transfer foil, transfer medium, and method of manufacturing transfer foil - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a transfer foil capable of preventing peeling action by achieving an appearance in which the transfer foil is embedded and transferred to prevent counterfeiting caused by peeling an anti-counterfeiting medium and attaching the anti-counterfeiting medium to a counterfeit to be used.SOLUTION: The transfer foil includes: an adhesive layer 15; a diffraction structure formation layer 13 located on the adhesive layer 15; and a reflection layer 14 arranged on the diffraction structure side of the diffraction structure formation layer 13. A reflection reduction structure 2 is provided on a side opposite to the diffraction structure side on the diffraction structure formation layer 13 along a shape contour of the transfer foil. The reflection reduction structure is composed of a minute irregular structure having 2,050-400 nm of a distance between apexes and 0.25 or more of an aspect ratio.

Description

  The present invention relates to a transfer foil having an optical variable device (OVD) typified by a diffraction grating, which is transferred to a medium requiring security, and a method for manufacturing the same. The present invention relates to a transfer foil and a method for manufacturing the transfer foil for preventing the film from being peeled off and attached to a counterfeit product.

  In the past, bad counterfeit damage has become a major social problem. Therefore, as a countermeasure against forgery, there is a means for providing a forgery prevention medium such as a label for determining whether the article is a genuine product so that the article can be distinguished from the forgery. As this anti-counterfeit medium, many anti-counterfeit means such as functional ink for anti-counterfeiting, special printing, hologram, magnetic recording, IC tag and the like are adopted. However, even if these anti-counterfeit measures are affixed to the article, fraudulent acts such as peeling off the anti-counterfeit label from the genuine product and attaching it to the counterfeit product are frequently performed.

  For this reason, a method aimed at preventing reattachment of a forgery prevention label has been considered. For example, if a forgery prevention label is notched and you try to peel it off forcibly, the notch will trigger and the forgery prevention label will tear, a method for making the base material of the forgery prevention label a brittle material, If it does so, characters, such as "VOID", will appear on a surface base material, and there exists a pattern brittle type etc. with which ink adheres to articles | goods.

  However, in these methods, if an organic solvent such as a label remover is soaked and the anti-counterfeit label is gently peeled off, the label will not be damaged and can be reused.

  Furthermore, in order to prevent peeling due to an organic solvent, a method for preventing re-sticking by containing an organic solvent-dissolving dye and causing the dye to ooze out from the printed part when it is peeled off with a label peeling liquid or the like. (Patent Document 1).

  Moreover, when the label is warmed with a dryer or the like by containing foam particles in the pressure-sensitive adhesive layer of the label, there is a method for preventing re-sticking by foaming the foam particles in the pressure-sensitive adhesive layer (Patent Document 2). ).

  Furthermore, there is a method for preventing re-sticking by making the adhesive of the label hardly soluble (Patent Document 3).

  However, in the method using an organic solvent-soluble dye, the surface of the anti-counterfeit label is warmly peeled off with a dryer or the like. In addition, even if using a method that contains foam particles and makes the adhesive hardly soluble, by scraping the entire surface of the article with the anti-counterfeit label attached, it can be reused without damaging the anti-counterfeit label. Become. In this case, the article itself is damaged. However, if the article is a consumable part of the device, if it is performed after the consumable part has been used, there is no problem even if a part of the article is damaged. End up.

JP-A-10-204363 JP 2000-293108 A JP 2005-266147 A

  The present invention is an invention made in view of the problems of the anti-counterfeiting technology, in order to prevent forgery that peels off the anti-counterfeit medium and attaches the anti-counterfeit medium to a forgery product to prevent forgery. It is in providing the transfer foil which prevents peeling action by making it the external appearance embedded and transferred.

  As means for solving the above problems, the invention described in claim 1 includes an adhesive layer, a diffractive structure forming layer on the adhesive layer, and a reflective layer provided on the diffractive structure side of the diffractive structure forming layer. A reflection reduction structure is provided along the shape outline of the transfer foil on the side facing the diffraction structure side on the diffraction structure forming layer, and the reflection reduction structure has a vertex interval of 200 to 400 nm. The transfer foil is characterized by having a fine concavo-convex structure with an aspect ratio of 0.25 or more.

  The invention according to claim 2 is a transfer foil comprising an adhesive layer, a diffractive structure forming layer on the adhesive layer, and a reflective layer provided on the diffractive structure side of the diffractive structure forming layer. On the side facing the diffractive structure side on the structure forming layer, a reflection reducing structure is provided in a region along the shape contour of the transfer foil and a region other than the region along the shape contour in the form of letters or patterns, and the reflection reduction The transfer foil is characterized in that the structure is a fine concavo-convex structure having a vertex interval of 250 to 400 nm and an aspect ratio of 0.25 or more.

  The invention described in claim 3 is a transfer medium obtained by transferring the transfer foil according to claim 1 or claim 2.

  Further, the invention according to claim 4 is provided with a reflectance-reducing structure forming layer on a substrate, and a reflectance comprising a fine concavo-convex structure along the shape contour of the transfer foil on the surface of the reflectance-reducing structure forming layer. A reduced structure is formed, and then a diffractive structure forming layer is stacked, a diffractive structure is formed on the diffractive structure forming layer, and a reflective layer and an adhesive layer are sequentially stacked. A method for producing a transfer foil that peels off at an interface with a layer, wherein a fine concavo-convex structure provided on a reflectance-reducing structure forming layer has a fine concavo-convex structure with a vertex interval of 200 to 400 nm and an aspect ratio of 0.25 or more. A stamping foil is produced, and the fine concavo-convex structure of the stamper is transferred and formed.

  Further, the invention according to claim 5 is provided with a reflectance reducing structure forming layer on a base material, a region along the shape contour of the transfer foil on the surface of the reflectance reducing structure forming layer, and the shape contour. A reflectance reduction structure composed of a fine concavo-convex structure is formed in a region other than the region in the form of letters and patterns, followed by laminating a diffractive structure forming layer, forming a diffractive structure in the diffractive structure forming layer, and further reflecting layer A method for producing a transfer foil in which adhesive layers are sequentially laminated and peeled at an interface between a reflectance-reducing structure forming layer and a diffraction structure-forming layer. A stamper having a fine concavo-convex structure with an interval of 250 to 400 nm and an aspect ratio of 0.25 or more is produced, and the fine concavo-convex structure of the stamper is transferred and formed.

  By providing a reflection reduction structure along the shape outline of the transfer foil, the edge boundary line of the transfer foil becomes inconspicuous, and it becomes an embedded appearance. It is possible to prevent fraud that is affixed to the card and improve security.

It is a conceptual diagram when the reflection reduction structure is provided along the shape outline of the transfer foil of the present invention and the transfer foil is viewed from the front. It is a conceptual diagram when the reflection reduction structure is provided in the area | region along the shape outline of the transfer foil of this invention, and the area | region other than the area | region along the shape outline in the shape of a character or a pattern, and the transfer foil is seen from the front. It is the conceptual diagram which provided the reflection reduction structure along the shape outline of the transfer foil of this invention, and showed sectional drawing. It is the cross-sectional conceptual diagram which showed the state which provided the reflection reduction structure along the shape outline of the transfer foil of this invention, and transcribe | transferred the transfer foil to the to-be-transferred object. In the method for manufacturing a transfer foil in which the reflection reducing structure is provided along the shape contour of the transfer foil of the present invention, the reflectance reducing structure formed on the stamper is formed on the reflectance reducing structure forming layer on the support. It is the conceptual diagram which showed the process transferred along a shape outline. In the method for manufacturing a transfer foil according to the present invention, a reflection reduction structure is provided along the shape contour of the transfer foil, and the reflectance reduction structure formed on the stamper is applied to the reflectance reduction structure formation layer on the support by light irradiation. It is the conceptual diagram which showed the process to form. It is the conceptual diagram which showed the state by which the reflectance reduction structure part was shape | molded along the shape outline of a transfer foil in the manufacturing method of the transfer foil of this invention. In the method for manufacturing a transfer foil in which the non-reflectance reducing structure according to the present invention is provided in a region along the shape contour of the transfer foil and a region other than the region along the shape contour in a letter or pattern shape, the reflection on the support is reflected It is the conceptual diagram which showed the process of forming the reflectance reduction structure part formed in the stamper in a rate reduction structure formation layer by hot press. In the method for manufacturing a transfer foil in which the non-reflectance reducing structure according to the present invention is provided in a region along the shape contour of the transfer foil and a region other than the region along the shape contour in a letter or pattern shape, the reflection on the support is reflected. It is the conceptual diagram which showed the process of forming the reflectance reduction structure part formed in the stamper by light irradiation in a rate reduction structure formation layer. In the method for manufacturing a transfer foil in which the non-reflectance reducing structure portion of the present invention is provided in a region along the shape contour of the transfer foil and a region other than the region along the shape contour in a letter or pattern shape, the reflectance reduction structure portion is It is the conceptual diagram which showed the shape | molded state.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments for carrying out the present invention will be described in detail with reference to the drawings. FIG. 1 shows a transfer foil 1 transferred to an object to be transferred 16 according to the present invention, and a non-reflectance reducing structure portion is provided along the shape contour of the transfer foil. Is inconspicuous and shows an embedded appearance.

  In FIG. 2, the reflectance reduction structure 2 formed on the reflection part 4 and the diffraction structure part 3 is provided in a region along the shape contour of the transfer foil and in a region other than the region along the shape contour. The area other than the area along the line shows a state in which the character pattern “TOP” is provided, and when tilted, the pattern appears due to the difference in intensity of reflected light. The reflectance reduction structure portion 2 is formed only in the portion of the character pattern “TOP”, and the “TOP” character pattern can be observed depending on the angle.

  FIG. 3 is a conceptual diagram showing a cross-sectional view of the transfer foil 1 of the present invention, in which a reflectance-reducing structure forming layer 12 is laminated on a support 11, and the surface of the reducing structure-forming layer 12 has a reflectance-reducing structure. The portion 2 is formed along the contour of the transfer foil, and the diffractive structure forming layer 13 is laminated thereon, the diffractive structure portion 3 is formed on the surface of the diffractive structure forming layer 13, and the surface of the diffractive structure portion 3 is formed. Is provided with a reflective layer 14 and an adhesive layer 15 is further laminated thereon.

  FIG. 4 is a conceptual cross-sectional view showing a state in which the transfer foil 1 of the present invention has been transferred to the transfer object 16. During transfer, the transfer foil 1 is peeled off from the interface between the reflectance-reducing structure forming layer 12 and the diffraction structure forming layer 13 and transferred. The reflectance reducing structure 2 is formed on the surface of the foil along the shape contour of the transfer foil.

  5, FIG. 6 and FIG. 7 show a method for forming the reflectance reducing structure 2 formed on the surface of the transfer foil 1 of the present invention, and the reflectance reducing structure forming layer laminated on the support 11. 12 and the stamper 21 having the reflectance reducing structure portion 2 formed on the surface thereof are overlapped, set on the transparent fixing jig 23, and irradiated with the curing light 22, whereby the reflectance reducing structure is formed on the surface of the reflectance reducing structure forming layer 12. The process which forms the part 2 along the shape outline of transfer foil is shown.

  8, 9, and 10, the reflectance reduction structure portion 2 of the present invention is reflected in a pattern shape in a region along the shape contour of the transfer foil and a region other than the region along the shape contour of the transfer foil. 1 shows a manufacturing method of a transfer foil provided with a reflectance reduction structure portion 2, a reflectance reduction structure forming layer 12 laminated on a support 11, a reflectance reduction structure portion 2 and a non-reflectivity reduction structure portion 5 on the surface, The step of forming the reflectivity reducing structure 2 on the surface of the reflectivity reducing structure forming layer 12 is shown by superimposing the stamper 21 on which is formed, setting on the transparent fixing jig 23 and irradiating the curing light 22. .

  A diffractive structure forming layer 13 is further laminated on the reflectance reducing structure forming layer 12 having the formed reflectance reducing structure 2, and a diffractive structure 3 such as a hologram or a diffraction grating is formed on the surface of the diffractive structure forming layer 13. Using a stamper, transfer molding is performed by hot pressing.

  Furthermore, a thin film of metal or metal oxide is formed on the surface of the diffractive structure 3 on the surface of the diffractive structure forming layer 13 as a reflective layer 14 by a vacuum resistance heating method or an EB heating method, and an adhesive layer 15 is further provided thereon for transfer. Manufacture foil. When an adhesive is used as the adhesive layer 15, it is necessary to bond release paper.

  The produced transfer foil 1 is used after being transferred to the transfer object 16. When the support 11 is peeled off after the transfer, the interface between the reflectance-reducing structure forming layer 12 and the diffractive structure forming layer 13 is peeled off and transferred. The reflectance reducing structure 2 on the surface of the foil 1 appears.

  The structure of the reflection reducing structure 2 in the present invention is an uneven structure having a vertex interval of 200 to 400 nm and an aspect ratio of 0.25 or more. In principle, since the vertex interval is 200 to 400 nm, which is a smaller scale than the visible light wavelength, there is no strengthening due to light interference in the visible light wavelength range (400 nm to 700 nm) due to irregularities, and the aspect ratio is 0.25 or more This is because the scattering / reflection is suppressed and the scattering is reduced by defining the depth direction of the concavo-convex structure, and it is possible to prevent the diffracted light from being emitted in the normal direction regardless of the incident angle of the irradiated light. If the vertex interval is too small, the depth becomes shallow even when the aspect ratio is maintained, so that reflection increases. For this reason, the vertex interval is preferably 200 nm or more.

  The arrangement pattern of the concave portions or the convex portions in the concavo-convex structure is not limited to a matrix shape or a honeycomb shape, and may be an arrangement pattern with another periodicity such as a rectangular lattice or a random convex portion pattern. It is only necessary that the reflectance reduction structure portion 2 is formed two-dimensionally on the surface of at least the diffraction structure forming layer.

  In the transfer foil 1 in which the reflection reducing structure portion 2 is formed on the entire surface shown in FIG. 7, the reflection on the surface of the region along the shape outline of the transfer foil 1 is reduced, and the end boundary line of the transfer foil becomes inconspicuous and embedded. The appearance looks like this. In the foil in which the reflection reducing structure 2 is formed in the pattern shown in FIG. 10, the reflection reducing structure 2 is provided in a pattern in a region other than the region along the shape contour, and light other than the diffracted light depends on the viewing angle. Since it can be confirmed in a pattern shape, the forgery prevention effect is enhanced.

  The materials used for the support 11, the reflectance-reducing structure forming layer 12, the diffractive structure forming layer 13, the reflecting layer 14, and the adhesive layer 15 constituting the present invention will be described.

  The substrate 1 is a film or sheet made of a resin such as polyethylene terephthalate (PET) and polycarbonate (PC), and is required to be transparent in order to cure the reflectance-reducing structure forming layer 12.

  A photocurable resin or the like can be used for the reflectance-reducing structure forming layer 12. For example, epoxy (meth) acryl, urethane (meth) acrylate, etc. can be used.

  A thermoplastic resin or a thermosetting resin can be used for the diffraction structure forming layer 13. For example, acrylic resins include acrylic resins, epoxy resins, cellulose resins, vinyl resins, and the like.

  In addition, urethane resins, melamine resins, phenol resins, and the like obtained by adding polyisocyanate as a crosslinking agent to an acrylic polyol or polyester polyol having a reactive hydroxyl group and crosslinking can be used. The thickness is preferably 0.5 to 5.0 μm.

  The reflective layer 14 can be made of aluminum, gold, silver, copper, Sn (tin), alloys containing these metals, metal oxides or sulfides, and the thickness is preferably 100 to 1000 mm.

  The reflective layer 14 is patterned by vapor deposition in a pattern using a mask, the vapor deposition layer 14 is provided on the diffractive structure forming portion 5, and a transparent resin coating liquid is provided thereon as a resist and dried. The pattern can also be formed by removing the reflective layer 14 made of the exposed deposited film with a post-etching solution. In the case where an aluminum vapor deposition film is used as the reflective layer 14, it is known that an aqueous sodium hydroxide solution is used as an etching solution.

  For the adhesive layer 15, thermoplastic resins such as polyester resin, acrylic resin, vinyl chloride resin, polyamide resin, polyvinyl acetate resin, rubber resin, ethylene-vinyl acetate copolymer resin, vinyl chloride acetate copolymer resin can be used. The film thickness is preferably 1 to 20 μm.

  In general, a concavo-convex structure having a vertex interval of 2500 to 400 nm and an aspect ratio of 0.25 or more is obtained by electron beam drawing on an EB resin coated on a glass substrate to obtain a concavo-convex structure. A stamper 21 is formed by forming a thin film of gold or silver on the formed concavo-convex structure and performing metal plating thereon.

  The prepared stamper 21 is used as it is, and the reflectance-reducing structure forming layer 12 is heated and pressurized, cured by irradiating ultraviolet rays or an electron beam from the substrate side, and the surface-reduced reflectance reducing structure portion 2 is transferred and molded. In general, however, the stamper 21 is duplicated and used.

  The diffractive structure 3 can also be formed by the same method. The stamper 13 having the diffractive structure 3 is used as the diffractive structure forming layer 13, and the diffractive structure 3 is heated and pressed to form a transfer.

  When the produced transfer foil 1 is attached to the transfer object 16 and the substrate 1 is peeled off, the transfer foil 1 is peeled off at the interface between the reflectance-reducing structure forming layer 12 and the diffraction structure-forming layer 13, and the transfer foil 1 has a reduced reflectance on the surface. The diffractive structure forming layer 13 having the structure portion 2 is formed.

Examples will be described in detail below. On one side of a support 11 made of a transparent polyethylene terephthalate film having a thickness of 25 μm, a composition having the following blending ratio was applied as a reflectance-reducing structure forming layer 12 by a gravure printing method at a coating thickness of 3 μm and a drying temperature of 110 ° C. Formed.
<Reflectance reduction structure forming layer>
Unsaturated group-containing urethane resin 100 parts Photopolymerization initiator (Irgacure 184 manufactured by Ciba Specialty Chemicals) 1.5 parts Release agent (acrylic silicone BYK-3700 manufactured by Big Chemie) 3 parts Solvent (methyl ethyl ketone) 400 parts Thereafter, vertex interval A nickel stamper (matrix) having a fine concavo-convex structure of 350 nm and an aspect ratio of 0.5 in a pattern and a region along the shape contour of the transfer foil 1 is heated and pressed at 130 ° C. with a linear pressure of 500 N / cm. In that state, a metal halide lamp was used from the support side to irradiate a light amount of 200 mJ / cm 2 to be cured. And this embossed film was peeled from the nickel stamper (matrix), and the embossed film in which the reflectance reduction structure was formed was obtained. In order to further increase the surface hardness, a light amount of 300 mJ / cm 2 was additionally exposed from the embossed surface with a high-pressure mercury lamp in a nitrogen atmosphere.

As the diffraction structure forming layer, a composition having the following blending ratio was applied at a coating thickness of 2 μm and a drying temperature of 110 ° C. by a gravure printing method.
<Diffraction structure forming layer>
Mixture of vinyl chloride-vinyl acetate copolymer and urethane resin 25 parts Solvent (methyl ethyl ketone) 70 parts (toluene) 30 parts Nickel stamper (matrix) having a diffractive structure with an apex interval of 0.05 mm and an aspect ratio of 0.1 The film was heated and pressed at a linear pressure of 500 N / cm and 180 ° C. to be cured. And this embossed film was peeled from the nickel stamper (matrix), and the embossed film in which the diffraction structure was formed was obtained.

  An Al thin film, which is a metal thin film, is provided as a reflective layer 14 on the entire surface of the formed diffractive structure to a thickness of 80 nm by vacuum deposition, and then the pattern mask is temporarily aligned with the diffractive structure forming portion. Then, the portion of the metal reflective layer where the pattern mask was not provided was removed by alkali treatment.

Next, as an adhesive layer, a composition having the following blending ratio was applied by a gravure printing method at a coating thickness of 4.0 μm and a drying temperature of 110 ° C.
<Adhesive layer>
Polyester resin 30 parts Solvent (toluene) 40 parts (Methyl ethyl ketone) 40 parts The transfer foil produced as described above was transferred to a medium to be transferred (paper) to obtain an anti-counterfeit article, and the produced anti-counterfeit article was visually observed. . Compared with the conventional transfer foil with a diffractive structure, the transfer foil with a diffractive structure according to the present invention has an appearance that the end boundary line of the transfer foil becomes inconspicuous and is embedded. Moreover, the latent image by the reflected light amount of the foil surface was provided to parts other than the area | region along the shape outline of the transfer foil 1, and the forgery prevention effect increased.

DESCRIPTION OF SYMBOLS 1 ... Transfer foil 2 ... Reflectivity reduction structure part 3 ... Diffraction structure part 4 ... Reflection part 5 ... Non-reflectance reduction structure part 11 ... Support body 12 ... Reflectivity Reduction structure forming layer 13 ... Diffraction structure forming layer 14 ... Reflective layer 15 ... Adhesive layer 16 ... Transfer 21 ... Stamper 22 ... Curing light 23 ... Transparent fixing jig

Claims (5)

  A transfer foil comprising an adhesive layer, a diffractive structure forming layer on the adhesive layer, and a reflective layer provided on the diffractive structure side of the diffractive structure forming layer, facing the diffractive structure side on the diffractive structure forming layer A reflection reduction structure is provided on the side along the shape contour of the transfer foil, and the reflection reduction structure is composed of a fine concavo-convex structure having a vertex interval of 200 to 400 nm and an aspect ratio of 0.25 or more. Foil.   A transfer foil comprising an adhesive layer, a diffractive structure forming layer on the adhesive layer, and a reflective layer provided on the diffractive structure side of the diffractive structure forming layer, facing the diffractive structure side on the diffractive structure forming layer On the side, a reflection reducing structure is provided in a region along the shape contour of the transfer foil and a region other than the region along the shape contour in the form of letters or patterns, and the reflection reduction structure has an aspect ratio of 200 to 400 nm between the vertices. A transfer foil comprising a fine relief structure having a ratio of 0.25 or more.   A transfer medium obtained by transferring the transfer foil according to claim 1.   A reflectance-reducing structure forming layer is provided on a substrate, and a reflectance-reducing structure consisting of a fine concavo-convex structure is formed on the surface of the reflectance-reducing structure forming layer along the shape contour of the transfer foil, followed by formation of a diffraction structure. The transfer foil is peeled off at the interface between the reflectance reduction structure forming layer and the diffraction structure forming layer. A method for producing a stamper having a fine concavo-convex structure having a fine concavo-convex structure provided on a reflectance-reducing structure forming layer and having a fine concavo-convex structure having an apex interval of 200 to 400 nm and an aspect ratio of 0.25 or more. A method for producing a transfer foil, wherein the structure is formed by transferring a structure.   Provide a reflectance-reducing structure forming layer on the substrate, in the region along the shape contour of the transfer foil on the surface of the reflectance-reducing structure forming layer, in a character or pattern in the region other than the region along the shape contour, Reducing the reflectivity by forming a reflectivity-reducing structure consisting of a fine concavo-convex structure, then laminating a diffractive structure-forming layer, forming a diffractive structure on the diffractive structure-forming layer, and then laminating a reflective layer and an adhesive layer sequentially A method for producing a transfer foil that peels off at an interface between a structure forming layer and a diffraction structure forming layer, wherein a fine relief structure provided on a reflectance reducing structure forming layer has a vertex interval of 200 to 400 nm and an aspect ratio of 0. A method for producing a transfer foil, comprising producing a stamper having 25 or more fine concavo-convex structures and transferring the fine concavo-convex structure of the stamper.