JP5382322B2 - Hologram transfer foil - Google Patents

Description

  The present invention relates to a hologram transfer foil, and more particularly to a hologram transfer foil for transferring a hologram in a desired pattern onto a transfer target.

  Holograms are, for example, three-dimensional image reproduction and design applications utilizing light interference, anti-counterfeiting applications utilizing the difficulty of forgery, image and information recording / reproduction medium applications, light diffraction, reflection, and scattering. It is an optical article that is used for optical element applications that control the above.

  Holograms include holograms such as relief holograms and volume holograms. Relief holograms record and reproduce images and information by forming fine irregularities on the surface. The volume hologram is a hologram formed by recording information in the layer in the thickness direction of the hologram layer and interference fringes corresponding to the wavefront of light from the object in the form of transmittance modulation and refractive index modulation. .

  The hologram here is not limited to a three-dimensional image, but also includes an optical element in which a constant continuous pattern or a discontinuous pattern is formed, for example, an antireflection element called a diffraction grating or a moth eye.

  Hologram formation methods include a method of recording and forming using the interference phenomenon between reflected light from an article and reference light, a method using a computer generated hologram to produce interference fringe data from a digital data related to an object, a diffraction grating, etc. And a method of drawing the pattern with an electron beam.

  As a method for applying such a hologram to an article, there is a method using a hologram transfer foil. A conventional hologram transfer foil, for example, a relief type hologram transfer foil, forms a resin layer to be a hologram layer through a release layer on a base film, and forms a hologram relief pattern on the resin layer to form a hologram layer. The reflection layer is provided on the hologram relief pattern, and a heat sealable adhesive layer is further provided.

  In the case of volume hologram transfer foil, as described in Patent Document 1 or Patent Document 2, after applying a volume hologram forming material on a base film, interference corresponding to the wavefront of light from an object The fringes are formed by recording in the layer in the form of transmittance modulation and refractive index modulation, and can also be produced by exposing and developing the volume hologram original plate in close contact with the hologram forming layer.

  Such relief-type hologram transfer foil or volume-type hologram transfer foil has good adhesion to the transfer target, and the foil breakage when transferring the hologram to the transfer target in a desired pattern Is required to be good. Further, the transfer target also has a difference in adhesion due to differences in materials such as plastic and paper, and surface characteristics due to surface processing. However, when the adhesive layer is thickened or an adhesive having a low softening temperature is used in order to obtain good adhesiveness to a transfer target having poor adhesiveness, there is a problem that the foil cutting property is lowered.

  On the other hand, it is known that an inorganic filler such as silica is contained in the adhesive layer as a means for improving the foil cutting property of the transfer foil (Patent Documents 3 and 4), and such an inorganic filler is added to the hologram transfer foil. It was used. However, when an inorganic filler is contained, there is a problem that the heat seal temperature at the time of transfer becomes high and the hologram layer is easily damaged. In order to solve such a problem, a hologram transfer foil provided with an adhesive layer having a porous surface and a mat-like surface has been developed (Patent Document 5).

JP 2000-272295 A JP 2002-79797 A JP-A-4-185498 Japanese Patent Laid-Open No. 9-39391 Japanese Patent No. 3140820

  However, such a transfer foil has conventionally been required to prevent the occurrence of a piece of paper when it is transferred to a weak sheet-like member that is easily torn, particularly a weak paper such as a passport, and peeled off. There was a problem that the edge had to be sheared cleanly.

  The present invention has been made in view of such problems of the prior art, and an object of the present invention is to provide a hologram transfer foil that can be stably transferred to a weak sheet-like member.

A hologram transfer foil according to an embodiment of the present invention includes a base film, a hologram layer on which a hologram relief pattern is formed, a release layer provided between the base film and the hologram layer, and the hologram A heat seal layer provided on the opposite side of the release layer with respect to the layer, the heat seal layer comprising a water-based ethylene-acrylic acid copolymer emulsion and having a particle size larger than the thickness of the heat seal layer And the second additive particles and the third additive particles having a particle diameter smaller than the thickness of the heat seal layer, the first additive particles from both sides of the heat seal layer. protruding and the second additive particles are polymerized in one of the heat seal layer, wherein the third additive particles is especially a polymerizing the other of the heat seal layer To.

  The additive particles are made of silica.

  In addition, the heat seal layer includes a wax.

  The hologram layer is made of a resin having an ultraviolet curable crosslinked structure.

  In addition, the hologram layer includes a cross-linking structure adjusting additive that adjusts the number of cross-links of the resin.

  The resin is made of polyurethane acrylate, and the cross-linking structure adjusting additive is made of an oligomer.

  The hologram layer includes a wax.

  The release layer is made of an acrylic resin in which wax is dispersed.

  In addition, a transparent vapor deposition layer having a refractive index different from that of the hologram layer is provided between the hologram layer and the heat seal layer.

  In addition, a back coat layer is laminated on the base film.

  According to the present invention, it is possible to provide a hologram transfer foil having a heat seal layer that can be transferred at as low a temperature as possible and having a wide application range of the low temperature. Further, it is possible to provide a hologram transfer foil that is lightly peeled and easily cut at the edge during transfer.

It is a figure which shows the hologram transfer foil of this embodiment. It is a figure which shows the heat seal layer of this embodiment. It is a figure which shows the example of a transfer using the hologram transfer foil of this embodiment. It is a figure which shows the manufacturing method of the hologram transfer foil of this embodiment.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a schematic sectional view showing an embodiment of the hologram transfer foil of the present invention. In FIG. 1, a hologram transfer foil 1 includes a base film 2, a hologram layer 4, a transparent vapor deposition layer 5, and a heat seal layer 6 that are sequentially laminated on the base film 2 via a release layer 3. Yes. A timing mark 8 by silk screen printing is printed on the opposite side of the release layer 3 of the base film 2, and a back coat layer 7 is provided so as to cover the timing mark 8.

  First, the base film 2 will be described.

  As the base film 2 constituting the hologram transfer foil 1 of the present invention, those having dimensional stability, heat resistance, toughness, etc. can be used. For example, polyethylene, ethylene-vinyl acetate copolymer, polyacetic acid Vinyl, polyvinylidene chloride, polyvinyl fluoride, polyvinylidene fluoride, polystyrene, polymethyl methacrylate, nylon (registered trademark), polynorbornene, polyamide, polyimide, polyether sulfone, polyether ether ketone, triacetyl cellulose, polyethylene terephthalate, poly Vinyl chloride, polypropylene, polycarbonate, cellophane, vinylon (registered trademark), acetate, polyvinyl alcohol, ethylene-vinyl alcohol copolymer, tetrafluoroethylene-perfluoroalkyl vinyl ether Coalescence, a resin film such as a polyamide-imide, paper such as condenser paper, it is possible to use these complexes, and the like. The thickness of the base film 2 can be appropriately set in consideration of the material to be used, and can be set, for example, in the range of about 6 to 50 μm. In particular, the range of about 16 to 25 μm is preferable.

  Next, the release layer 3 will be described.

  The release layer 3 constituting the hologram transfer foil 1 of the present invention is transferred to the transfer target and located on the outermost surface, and improves the peelability during transfer, the foil breakability, and the transferred hologram layer. It functions as a protective layer. In consideration of the use of a vinyl chloride cover or the like, it is preferable to disperse inorganic fine particles, finely powdered polyethylene wax or the like based on a hard and plasticizer-resistant acrylic resin or cellulose resin to make the film easily cut.

  Examples of the release layer 3 include one or two of polymethacrylic ester resin, polyvinyl chloride resin, cellulose resin, silicone resin, chlorinated rubber, casein, various surfactants, metal oxides, and the like. A mixture of the above is used.

In particular, the release layer is preferably formed by appropriately selecting the material and the like so that the release force between the base film and the transfer layer is 1 to 5 g / inch (90 ° release). This release layer can be converted into an ink and formed on the surface of the substrate film by a known method such as coating, and the thickness is preferably in the range of 0.1 to 4 μm in consideration of the release force, foil breakage, and the like.
Moreover, the peeling layer 3 can also be made into the laminated structure which combined the 1st peeling layer and the 2nd peeling layer.

  Next, the hologram layer 4 will be described.

  The hologram in the hologram layer 4 constituting the hologram transfer foil 1 of the present invention is not limited to a three-dimensional image, but also an optical element in which a constant continuous pattern or a discontinuous pattern is formed, for example, an antireflection element called a diffraction grating or a moth eye. included. For example, the hologram layer 4 can be a relief type hologram layer.

  The hologram layer 4 is preferably made of an ultraviolet curable crosslinked resin. The resin preferably contains a cross-linking structure adjusting additive that adjusts the number of cross-links.

  When the hologram layer 4 is a relief hologram, it is formed using a thermosetting resin, a thermoplastic resin, an ionizing radiation curable resin or the like in order to form a fine uneven pattern, and the thickness is 0.1 to 20 μm. Preferably, it can set in the range of 0.5-10 micrometers. A range of about 1 to 2 μm is more preferable. In particular, in the case of ionizing radiation curable resin, 1.7 to 3.0 μm is preferable. In this case, if it is below the lower limit, it becomes the curing alienation limit of radiation curing, and if it exceeds the upper limit, the cutting property at the time of transfer may be deteriorated.

  Examples of thermosetting resins include unsaturated polyester resins, acrylic urethane resins, epoxy resins, urethane resins, epoxy-modified acrylic resins, epoxy-modified unsaturated polyester resins, alkyd resins, melamine resins, urea resins, phenol resins, and cellulose resins. Organic-inorganic hybrid resins containing metal alkoxide groups capable of sol-gel reaction with organic components, such as diallyl phthalate resin and polyacetal resin. Thermoplastic resins include acrylic resin, acrylamide resin, polystyrene resin, polyester resin, polyolefin, polyamide, polyimide, polyamideimide, polyurethane, nylon (registered trademark), polyvinyl acetate, polyvinyl alcohol, polyvinyl butyral, polycarbonate, silicone. Examples thereof include resins. These resins can be used alone or in combination of two or more kinds, and various isocyanate resins, metal soaps such as cobalt naphthenate and zinc naphthenate, peroxides such as methyl ethyl ketone peroxide, Thermal or ultraviolet curing agents such as benzophenone, acetophenone, anthraquinone, naphthoquinone, azobisisobutyronitrile, and diphenyl sulfide may be blended.

  In addition, as the ionizing radiation curable resin, a monomer, oligomer, polymer, or the like having an ethylenically unsaturated bond can be used. Examples of the monomer include 1,6-hexanediol, neopentyl glycol diacrylate, trimethylolpropane triacrylate, pentaerythritol triacrylate, pentaerythritol tetraacrylate, dipentaerythritol pentaacrylate, dipentaerythritol hexaacrylate, and the like. . Examples of the oligomer include epoxy acrylate, urethane acrylate, and polyester acrylate. Examples of the polymer include urethane-modified acrylic resins and epoxy-modified acrylic resins. From the viewpoints of heat resistance and processability, urethane-modified acrylic resins as described in JP-A No. 2000-63459 are preferably used.

  Further, as the photocurable resin used for the hologram layer 4, photocurable resins as described in JP-A-61-98751, JP-A-63-23909, and JP-A-63-23910 are disclosed. Resins can be mentioned.

  Moreover, in order to form the uneven | corrugated pattern shape of a relief hologram correctly, polymers, such as a non-reactive acrylic resin, polyester resin, a urethane resin, an epoxy resin, can be added.

  Moreover, when utilizing photocationic polymerization, an epoxy group-containing monomer, oligomer, polymer, oxetane skeleton-containing compound, and vinyl ethers can be used.

  Further, when the ionizing radiation curable resin is cured by light such as ultraviolet rays, a photopolymerization initiator can be added. Depending on the resin, a radical photopolymerization initiator, a cationic photopolymerization initiator, or a combination thereof (hybrid type) can be selected.

  Examples of the photo radical polymerization initiator include benzoin compounds such as benzoin, benzoin methyl ether, and benzoin ethyl ether, anthraquinone compounds such as anthraquinone and methylanthraquinone, acetophenone, diethoxyacetophenone, benzophenone, hydroxyacetophenone, and 1-hydroxycyclohexyl. Examples include phenyl ketone compounds such as phenyl ketone, α-aminoacetophenone, 2-methyl-1- (4-methylthiophenyl) -2-morpholinopropan-1-one, benzyldimethyl ketal, thioxanthone, acylphosphine oxide, Michler's ketone, and the like. be able to.

  As a photocationic polymerization initiator when using a compound capable of photocationic polymerization, aromatic diazonium salts, aromatic iodonium salts, aromatic sulfonium salts, aromatic phosphonium salts, mixed ligand metal salts, etc. should be used. Can do.

  In the case of so-called hybrid type materials that use both radical photopolymerization and cationic photopolymerization, each polymerization initiator can be mixed and used, and a fragrance that has the function of initiating polymerization of both with a single initiator. Group iodonium salts, aromatic sulfonium salts, and the like can be used.

  Furthermore, a release agent can be added to the hologram layer 4 in order to facilitate the formation of the concavo-convex pattern of the hologram. Examples of the release agent include known release agents and surfactants, for example, solid waxes such as polyethylene wax and amide wax, fluorine compounds, fluorine polymers, phosphate esters, silicone oils, and silicone resins.

  Moreover, in order to make the uneven shape of the relief accurate, or to impart hardness and heat resistance, inorganic oxide fine particles such as silica, titania and alumina, metal alkoxide, metal alkoxide oligomer and the like can be added.

  Furthermore, a polymerization inhibitor, an antioxidant, a sensitizer, an ultraviolet absorber, a stabilizer, a plasticizer, an antifoaming agent, and the like can be added to the hologram layer 4.

  In the present embodiment, the hologram layer 4 is formed by microembossing and UV curing is performed. Further, like the release layer 3, it is preferable to disperse inorganic fine particles, finely powdered polyethylene wax or the like. Furthermore, since the resin itself has a film break, it is preferable to add an oligomer. In addition, when the hologram layer is transferred, it is preferable to use a photoinitiator because it is easier to cut the film if the crosslink density is reduced to such an extent that the relief does not disappear due to heat or the luminance is not lowered. Furthermore, in order to adjust the crosslinking density, it is more preferable to appropriately adjust the UV irradiation time, irradiation intensity, and irradiation amount.

  In addition, as a hologram material, JP-A-2002-268523, JP-A-2000-272295, JP-A-3357013, JP-A-33557014, JP-A-2005-55473, JP-A-2001-329031 or special Reference may be made to the materials described in Japanese Unexamined Patent Publication No. 2005-115264.

  Next, the transparent vapor deposition layer 5 is demonstrated.

The transparent vapor-deposited layer 5 constituting the hologram transfer foil 1 of the present invention uses a hologram effect thin film that is combined with the hologram layer 4 to express a hologram and does not conceal the lower layer.

  Moreover, the transparent vapor deposition layer 5 will not be restrict | limited especially if it is a light-transmitting thing which can express a hologram effect. For example, a transparent material having a refractive index different from that of the resin constituting the hologram layer 4 can be used. In this case, the refractive index of the hologram effect thin film may be larger or smaller than the refractive index of the hologram layer 4, and the difference in refractive index is 0.1 or more, preferably 0.5 or more. The film thickness of the transparent vapor deposition layer 5 is preferably about 50 to 100 nm.

  In addition, regarding the material of the transparent vapor deposition layer 5, it is good to refer to the material described in Japanese Patent Publication No. 5-87835.

  Next, the timing mark 8 will be described.

  The timing mark 8 is a mark for stamping that is directly printed on the base film 2.

  Next, the back coat layer 7 will be described.

  The back coat layer 7 coats the timing mark 8 and blocks the heat seal layer 6 described later. For example, it is preferable to disperse microsilica in order to provide slipperiness to an antistatic UV ink. The film thickness of the back coat layer 7 is preferably about 2 μm.

  Next, the heat seal layer 6 will be described.

  In the present embodiment, the heat seal layer 6 preferably uses a water-based ethylene-acrylic acid copolymer emulsion in order to improve low-temperature adhesion and facilitate adhesion to paper.

  As the heat seal layer 6, it is preferable to use a thermoplastic resin. Moreover, as a thermoplastic resin, the thermoplastic resin conventionally used as a heat seal agent can be used. For example, rubber systems such as polybutadiene, polyisoprene, polyisobutylene, styrene-butadiene rubber, styrene-isoprene rubber, polymethyl (meth) acrylic acid, polymethyl (meth) acrylate, poly (meth) acrylic acid, polyethyl (meth) acrylate, Acrylic resin systems such as polypropyl (meth) acrylate, polybutyl (meth) acrylate, poly (2-ethylhexyl) (meth) acrylate, polystyrene systems such as polystyrene and acrylic-styrene copolymers, and polyvinyl ether systems such as polyisobutyl ether , Polyolefins such as polyethylene, polypropylene, polybutene, etc., polyvinyl acetate, vinyl chloride-vinyl acetate, polyvinyl alcohol, polyvinylidene chloride, polyvinyl chloride, polyacrylamide, Li-methylolacrylamide, polyester, polyvinyl butyral, polyurethane, polycarbonate resins, silicone resins, acrylic - silicone resin, polyethylene oxide and the like can be used. Examples of the copolymer include copolymers of vinyl acetate and acrylic resin such as vinyl acetate-butyl (meth) acrylate and vinyl acetate-octyl (meth) acrylate, vinyl chloride-butyl (meth) acrylate, vinylidene chloride- Copolymers such as butyl (meth) acrylate, copolymers such as ethylene-butyl (meth) acrylate, ethylene-methyl (meth) acrylate, and the like can be used. Two or more of these resins may be used. From the viewpoint of softening temperature and adhesion, a copolymer of an olefin resin and an acrylic resin, such as ethylene- (meth) acrylic acid, ethylene-methyl (meth) acrylate, or a blend of an olefin resin and an acrylic resin is particularly preferable. .

  In the present invention, a known filler such as silica fine particles, alumina fine particles, colloidal fine particles and the like may be added to the heat seal layer 6 in order to improve the foil breakability. However, since these fine particles are not usually softened by heat during transfer, the content in the heat seal layer 6 is preferably 10% by weight or less from the viewpoint of low-temperature sealability.

  In addition, as shown in FIG. 2, it is preferable that a part of the first additive particles 6a protrude from the film by making the diameter of the first additive particles 6a larger than the coating thickness. For example, it is preferable that the thickness of the heat seal layer 6 is 5 to 6 μm, and a part of the first additive particles 6a having a particle size larger than that is blended. As shown in FIG. 2, when heat is applied to the heat seal layer 6 from one surface, the second additive particles 6b made of silica or the like having a particle size smaller than the film thickness of the heat seal layer 6 Is polymerized in the opposite direction, and the third additive particles 6c made of wax or the like are polymerized in the direction of heat. By applying heat in this way, the heat seal layer 6 can be easily cut.

  In addition, regarding the material of the heat seal layer 6, it is preferable to refer to the materials described in Japanese Patent No. 3140820, Japanese Patent Laid-Open No. 4-185498, and Japanese Patent Laid-Open No. 9-39391.

  The hologram transfer foil of the present invention can be transferred by heating and pressurizing, and a transfer system such as a heat stamp type or a roll type can be used as the transfer device. Examples of the transfer object of the hologram transfer foil of the present invention include paper, synthetic paper, plastic and metal films and sheets, plastic plates, glass plates, and the like. Examples of the plastic include a vinyl chloride resin, an acrylic resin, a polystyrene resin, a polyester resin such as polyethylene terephthalate, and a polycarbonate resin. In addition, for the purpose of utilizing the design property of the hologram, a wrapping paper, a packaging film, a premium card, a magazine, a book, or the like may be used as a transfer target. Also, utilizing the fact that holograms are difficult to counterfeit, a medium for authenticity that requires high anti-counterfeiting properties, such as bank savings cards, passbooks, credit cards, identification cards, examination cards, passports, Bills, gift certificates, stock certificates, boarding tickets, air tickets, prepaid cards such as transportation and public telephones, and the like may be used as the transfer target. Or luxury watches, precious metals, jewelry, world-renowned luxury products that are said to be so-called brand goods, and products that are subject to counterfeiting, tags attached to them, music software, video software, computer software, game software, etc. Articles such as recording media on which these are recorded and cases thereof can also be cited as the transfer target. In addition, information can be recorded on the hologram layer as necessary.

  Further, as a transfer object of the hologram transfer foil of the present invention, an optical element having an optical function or controlling reflected light, such as a reflection plate, an antireflection plate, a polarizing plate, a light guide plate, etc. Examples thereof include members installed inside or on the surface of display windows of instruments, mobile phones and the like.

  The transfer of the hologram transfer foil of the present invention may be either a transfer to a part of the transfer target or a transfer to the entire surface. In the case of transfer to a part, transfer of a complicated pattern or characters, etc. Transfer may be performed using a mold.

  FIG. 3 is a diagram showing a transfer example using the above-described hologram transfer foil 1 of the present invention. As shown in FIG. 3, the hologram transfer foil 1 of the present invention is placed on the transfer target 11 so that the heat seal layer 6 is in contact therewith, and thermocompression bonding is performed from the base film 2 side by a heat stamp 21 having a desired pattern. Then, heat sealing is performed, and then the base film 2 side is peeled off. At the time of peeling, the fine particles contained in the heat seal layer 6 cause a good foil breakage at the boundary between the heat-sealed part and other parts, and the peeling layer 3 in the area pressed by the heat stamp 21, hologram The layer 4, the transparent vapor deposition layer 5, and the heat seal layer 6 are transferred to the transfer target 11. Moreover, in the area | region pressed with the heat stamp 21, since microparticles | fine-particles also soften and express sealing property, the adhesiveness of the heat seal layer 6 will become a very high thing.

  Next, the method for producing a hologram transfer foil of the present invention will be described using the hologram transfer foil 1 shown in FIG. 1 as an example. FIG. 4 is a diagram showing a method for manufacturing a hologram transfer foil.

  In the production method of the present invention, a release layer 3 is formed on a base film 2, a resin layer to be a hologram layer 4 is formed on the release layer 3, and a hologram relief pattern is formed on the resin layer to form a hologram layer 4, a step of providing the transparent vapor deposition layer 5 on the hologram relief pattern of the hologram layer 4, and a step of providing the heat seal layer 6 on the transparent vapor deposition layer 5. In addition, before the process of providing the transparent vapor deposition layer 5 on the hologram relief pattern of the hologram layer 4, when performing the process of silkscreen printing the timing mark 8 on the base film 2 and forming the backcoat layer 7 thereon. preferable.

  The formation of the release layer 3 on the base film 2 is performed by using the material used for the release layer 3 as necessary with acetone, methyl ethyl ketone, cyclohexanone, benzene, toluene, xylene, ethyl acetate, methanol, ethanol, isopropanol, A coating solution is prepared by mixing with a solvent such as 1-butanol. The coating liquid is formed by a known coating method, for example, gravure coating method, roll coating method, curtain coating method, flow coating method, lip coating method, doctor blade coating method, comma coating method, die coating method, spin coating method, etc. The release layer 3 can be formed by coating on the film 2. In addition, after application | coating, if necessary, it dries at 50-180 degreeC, for example, volatilizes a solvent, and if necessary, it can dry again and the peeling layer 3 can be formed.

  In addition, the hologram layer 4 is formed by first using the material used for the hologram layer 4 as necessary with acetone, methyl ethyl ketone, cyclohexanone, benzene, toluene, xylene, ethyl acetate, methanol, ethanol, isopropanol, 1-butanol. A coating solution is prepared by mixing with a solvent such as the above. This coating solution is peeled off by a known coating method such as gravure coating method, roll coating method, curtain coating method, flow coating method, lip coating method, doctor blade coating method, comma coating method, die coating method, spin coating method, etc. 3 is applied to form a resin layer. In addition, after application | coating, as needed, it can dry at 50-180 degreeC, for example, and a solvent is volatilized, If necessary, it can dry again and a resin layer can be formed.

  In the formation of the relief-type hologram layer 4, a hologram or diffraction grating produced using a laser beam or an electron beam is used as an original, and this original is brought into close contact with an uncured resin layer. The hologram layer 4 is formed by curing with ionizing radiation such as an electron beam or heat. Alternatively, a nickel stamper produced by electroforming using the above master as a mother mold, a stamper, a thermosetting resin, or a photocurable resin composition that has a concavo-convex pattern replicated by hot pressing using a thermoplastic resin. A resin stamper made by pouring into a concavo-convex pattern and curing is adhered to an uncured resin layer, and in that state, the resin layer is cured by ionizing radiation such as ultraviolet rays and electron beams, or by heat. Layer 4 is formed.

  In addition, after forming a solid resin layer at room temperature, the stamper prepared from the hologram master or the master is in close contact with the uncured resin layer (heat-adhered as necessary), and after peeling the master or stamper, The resin layer may be cured by ultraviolet rays, electron beams, heat, or the like to form the hologram layer 4.

  Further, in order to promote the refractive index modulation and complete the polymerization reaction, after the interference exposure, it is possible to appropriately perform a process such as full exposure with ultraviolet rays or heating.

  Here, the process of silkscreen printing the timing mark 8 on the base film 2 and forming the backcoat layer 7 thereon is performed.

  In the step of providing the transparent vapor deposition layer 5 on the relief pattern of the relief hologram layer 4, known methods such as vacuum vapor deposition, sputtering, reactive sputtering, ion plating, electroplating, and coating can be used.

  In the step of providing the heat seal layer 6 on the transparent vapor-deposited layer 5, a coating solution (preferably in an emulsion state) containing a heat-sealable thermoplastic resin, hollow resin particles, water and alcohol is applied on the transparent vapor-deposited layer 5. The heat seal layer 6 is formed by drying and drying again if necessary. The above-mentioned materials can be used for the thermoplastic resin and fine particles used.

  Next, the present invention will be described in more detail by showing more specific examples.

  Example 1 will be described.

  First, an acrylic resin (Showa Co., Ltd.) containing PE-wax with an average particle diameter of about 3 μm on one side of a base film 2 of a polyethylene terephthalate raw material (Lumirror 25T60C manufactured by Toray Industries, Inc.) having a thickness of 25 μm. The release layer 3 (film thickness of about 1 μm) is formed using 48wx6-H0 manufactured by Ink Industries.

[Base film]
Polyethylene terephthalate film (hereinafter referred to as “PET film”)
(Lumilar 25T60C manufactured by Toray Industries, Inc.)
[Peeling layer]
・ Acrylic resin (including PE-wax)
(48wx6-H0 manufactured by Showa Ink Industry Co., Ltd.)

Next, a resin layer (film thickness of about 2 μm) for forming a hologram layer is formed on the release layer 3 with a photocurable resin having the following composition.
[Hologram layer]
・ Photo curable resin (MHX405, manufactured by The Inktec Co., Ltd.)
Polyurethane acrylate 34% by weight
Photopolymerization initiator: 1% by weight
Solvent (Releasable silicone): 65% by weight

Next, hologram replication is performed as follows to form the hologram layer 4. First, a hologram master is produced using laser light, and this hologram master is mounted on an embossing roller of a continuous replication device. Next, the hologram layer base is installed on the paper feeding side of the continuous replication device, supplied to the embossing roller at a speed of 20 m / min, and pressed at a press pressure of 1 × 10 ⁵ Pa and a roll temperature of 140 ° C. Was formed in the resin layer. Subsequently, the resin layer is cured by irradiating ultraviolet rays generated from a high-pressure mercury lamp with a normal irradiation amount of ½, and a relief is formed to form the hologram layer 4.

  Next, the transparent vapor deposition layer 5 is formed on the hologram layer 4 by a vacuum vapor deposition method. The transparent vapor deposition layer 5 has a refractive index different from that of the hologram layer 4. In this embodiment, the refractive index of the transparent vapor deposition layer 5 is set to 1.8 to 2.3 with respect to the refractive index of 1.4 of the hologram layer.

[Transparent deposition layer]
ZnS and TiO2

  Next, the timing mark 8 is silk-screen printed on the base film 2.

[Timing mark]
-Black silk ink (JETE 1 black, manufactured by Seiko Advance Co., Ltd.)

  Next, the back coat layer 7 is formed on the base film 2 and the timing mark 8.

[Back coat layer]
・ UV ink (silica agent is included at 1% by weight)
(UVAS manufactured by Showa Ink Industry Co., Ltd.)

  Next, a heat seal layer 6 (film thickness of about 5 μm) having the following composition is formed on the transparent vapor deposition layer 5.

[Heat seal layer]
THDHS-S (46) 15 manufactured by Showa Ink Industry Co., Ltd.
・ Water-based ethylene-acrylic acid copolymer emulsion: 85% by weight
・ Silica agent: 15% by weight
・ PE-wax: 0.1% by weight

  Example 2 will be described. In Example 2, instead of the hologram layer of Example 1, a resin layer having the following composition is formed.

[Hologram layer]
・ Photo curable resin (MHX405, manufactured by The Inktec Co., Ltd.)
Polyurethane acrylate 34% by weight
Photopolymerization initiator: 2% by weight
Solvent (Releasable silicone): 60% by weight
・ PE-wax (Slip agent B manufactured by Showa Ink Industries, Ltd.)
... 2% by weight
・ Oligomer / functional group number 2, molecular weight 3000
(Nippon Synthetic Chemical Industry Co., Ltd. Shiko 6630) ... 2% by weight

Example 3 will be described. In Example 3, a resin layer is formed using a cellulose resin having the following composition instead of the acrylic resin of the release layer of Example 1.
[Peeling layer]
・ Cellulose resin (including 20% by weight of PE-wax)
(CAPB20 manufactured by Showa Ink Industry Co., Ltd.)

  Next, Example 4 will be described. About a base film and a peeling layer, the thing similar to Example 1 is used.

  Next, the photocurable resin composition solution for volume hologram formation was applied to a 50 μm PET film (Lumirror 25T60C manufactured by Toray Industries, Inc.) with a gravure coat so that the film thickness after drying was 3 g / m 2. Furthermore, a 50 μm PET film is laminated on the coated surface to prepare a volume hologram forming film.

  The PET film on one side of the volume hologram forming film is peeled off, and the coated photocurable resin composition surface is laminated on a volume hologram master prepared in advance. Therefore, an argon laser beam having a wavelength of 514 nm is incident from the hologram forming film side to obtain a volume hologram.

[Hologram layer]
・ 60 parts by weight of photocurable resin composition for volume hologram formation ・ 25 parts by weight of methyl ethyl ketone (MEK) ・ 15 parts by weight of toluene

  Next, the volume hologram produced was peeled off from the original and laminated on the release layer 3 to obtain a configuration of PET film / release layer / volume hologram layer / PET film, and further processed by heating and ultraviolet irradiation.

With the above-described configuration, the PET film in contact with the volume hologram layer 4 is peeled off, and a 6% silica fine particle is separated from the volume hologram layer by a weight-sensitive adhesive (using the heat seal layer of Example 1). The solution containing is coated with a gravure coat so as to be ² g / m ² after drying to obtain a volume hologram transfer foil comprising PET / peeling layer / volume hologram layer / heat-sensitive adhesive layer.

  When the hologram foils produced in Examples 1 to 4 were transferred to paper at 120 ° C. with a hologram transfer machine (Security Foiling Co., Ltd .: Micropoise PRO), the foils were transferred well with good foil breakage.

  As mentioned above, although the hologram transfer foil of this invention has been demonstrated based on embodiment, this invention is not limited to these embodiment, A various deformation | transformation is possible.

DESCRIPTION OF SYMBOLS 1 ... Hologram transfer foil 2 ... Base film 3 ... Release layer 4 ... Hologram layer 5 ... Transparent vapor deposition layer 6 ... Heat seal layer 7 ... Backcoat layer 8 ... Timing mark

Claims (10)

A base film;
A hologram layer formed with a hologram relief pattern;
A release layer provided between the base film and the hologram layer;
A heat seal layer provided on the opposite side of the release layer with respect to the hologram layer;
With
The heat seal layer is
It consists of an aqueous ethylene-acrylic acid copolymer emulsion,
Including first additive particles having a particle size larger than the thickness of the heat seal layer ,
The second additive particles and the third additive particles having a particle size smaller than the thickness of the heat seal layer,
The first additive particles protrude from both sides of the heat seal layer,
The second additive particles are polymerized to one of the heat seal layers,
The hologram transfer foil, wherein the third additive particles are polymerized to the other of the heat seal layers . The hologram transfer foil according to claim 1 , wherein the additive particles are made of silica. The heat seal layer, hologram transfer foil according to claim 1 or claim 2, characterized in that it comprises a wax. The hologram transfer foil according to any one of claims 1 to 3 , wherein the hologram layer is made of a resin having an ultraviolet curable crosslinking structure. The hologram transfer foil according to claim 4 , wherein the hologram layer includes a crosslinking structure adjusting additive that adjusts the number of crosslinks of the resin. The resin is made of polyurethane acrylate,
The hologram transfer foil according to claim 5 , wherein the crosslinking structure adjusting additive comprises an oligomer. The hologram layer is a hologram transfer foil according to any one of claims 4 to 6, characterized in that it comprises a wax. The release layer, a hologram transfer foil according to any one of claims 1 to 7, characterized in that it consists of acrylic resin wax are dispersed. Hologram transfer foil according to any one of claims 1 to 8, characterized in that during the heat-sealing layer and the hologram layer has a different transparent vapor deposited layer having a refractive index as the hologram layer. Hologram transfer foil according to any one of claims 1 to 9, characterized in that laminating a back coat layer on the base film.

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