JP2008139628A - Hologram transferring foil - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide hologram transferring foil capable of transferring hologram hard to be whitened even when being subjected to high temperature and bending force, free from remarkable deterioration in appearance, and having excellent designing properties and/or security properties to the body to be transferred. <P>SOLUTION: In the hologram transferring foil 1 stacked with a base material 11, a stripping layer 13, a hologram layer 15, a transparent reflective layer 17, a high luminance ink layer 18 and an adhesive layer 19 in order, the high luminance ink layer 18 comprises a metal vapor-deposited film small piece surface-treated at least with organic fatty acid, methyl silyl isocyanate or a cellulose derivative, and also, the transparent reflective layer 17 is titanium oxide. When hologram is transferred to the body 101 to be transferred using the hologram transferring foil, even under transferring conditions where a heating stamper of 150 to 170°C is pressurized under 50 to 500 kPa for 0.2 to 1.0 s, and is thereafter stripped, the hologram is not whitened. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a hologram transfer foil. More specifically, the present invention relates to a hologram transfer foil that is difficult to whiten even when heated or bent, is not significantly deteriorated in appearance, is bright, and has excellent design and / or security. .

  In the present specification, “ratio”, “part”, “%” and the like indicating the composition are based on mass unless otherwise specified, and the “/” mark indicates that they are integrally laminated. “PET” is an abbreviation, functional expression, common name, or industry term for “polyethylene terephthalate”, “stamper” for “mold”, and “UV” for “ultraviolet light”.

(Main use) The main use of the hologram transfer foil of the present invention is such as credit cards, certificates such as credit cards, certificates, certificates, etc., employee cards, membership cards, student cards, etc. ID card, gift certificate, admission card, passport, service point, and other media that proves the rights and qualifications (prepaid) paid in certain amounts, book covers, brochures, record jackets, package, clothing, It requires design and / or security such as daily necessities.
However, it is not particularly limited as long as it is used for transferring to a transfer target requiring design and / or security.

(Background Art) Conventionally, as a hologram transfer foil, a metal gloss hologram is known in which a metal thin film is formed on the entire surface by a vacuum film forming method to form a reflective layer. However, the metallic reflective layer is very bright in silver metallic luster, but when exposed to high heat or bent at an acute angle by external force, the metal thin film is likely to crack, and the light is diffusely reflected by the crack. There was a problem that the hologram whitened and the appearance deteriorated significantly. Furthermore, for example, when a picture hologram is used as a pattern reflection layer, a resist is printed and etched in a separate process after providing a metal reflection layer on the entire surface, so that it is not suitable for small-lot production and costs high. There is also a drawback.
Accordingly, the hologram transfer foil is a hologram that is difficult to whiten, has no significant deterioration in appearance, is bright, and has excellent design and / or security even when exposed to high heat or bent at an acute angle by external force. In addition, there is a demand for small-lot production even for pattern holograms, which can be formed by a printing method using existing equipment, and can be easily produced at low cost.

(Prior Art) Conventionally, a hologram transfer foil is known in which a full-surface reflective layer of a metal thin film is provided by a vacuum film forming method (see, for example, Patent Document 1). However, a bright hologram with silver metallic luster can be obtained with the metallic reflective layer, but when transferring the hologram to the transfer object using the hologram transfer foil, a heating stamper at 150 to 170 ° C. is pressurized at 200 kPa for 0.5 seconds. Then, under the transfer conditions where peeling is performed, the hologram is whitened and the appearance is remarkably deteriorated. In addition, even when the hologram transfer foil is bent, the metal reflection layer cannot follow the extension caused by bending, cracks occur in the metal thin film, and light is irregularly reflected at the cracked portions, and the hologram is whitened. And the appearance is significantly deteriorated.
Furthermore, the present applicant has disclosed one using a high-brightness ink layer as a reflective layer and one using a transparent reflective layer and a high-brightness ink layer in combination (for example, see Patent Document 2). However, in the case of using only the high-brightness ink layer as the reflective layer, there is little practical problem, but a sufficient light diffraction effect cannot be obtained. There is no description of property and deterioration with respect to bending, and the above-mentioned drawbacks are solved by limiting the material of the transparent reflective layer and using the high-brightness ink layer in combination.

Japanese Patent No. 2877968 JP 2003-285599 A

  In order to solve the above-described problems, the present inventors have made extensive studies and have completed the present invention. Its purpose is to prevent whitening even when subjected to high heat and bending force, and to transfer holograms with excellent design and / or security without noticeable deterioration in appearance to the transfer target. It is also possible to provide a hologram transfer foil that can be formed by a printing method using existing equipment and can be easily produced at low cost.

To solve the above problem,
The hologram transfer foil according to the invention of claim 1 is a hologram in which a substrate and a release layer, a hologram layer, a transparent reflective layer, a high-brightness ink layer, and an adhesive layer are sequentially laminated on at least one surface of the substrate. In the transfer foil, the high-brightness ink layer contains at least a metal vapor-deposited film piece surface-treated with an organic fatty acid, methylsilyl isocyanate, or a cellulose derivative, and the transparent reflective layer is made of titanium oxide. is there.
In the hologram transfer foil according to the invention of claim 2, when transferring the hologram to the transfer object using the hologram transfer foil, a heating stamper at 150 to 170 ° C. is applied at 50 to 500 kPa for 0.2 to 1.0 second. The hologram is not whitened even under the transfer conditions in which it is peeled off after being pressed.

According to the first aspect of the present invention, it is possible to transfer a hologram that is not easily whitened even when subjected to high heat or bending force, has no significant deterioration in appearance, and has excellent design and / or security, to a transfer target. There is provided a hologram transfer foil that can be produced by a printing method using existing equipment and can be easily produced at a low cost.
According to the present invention of claim 2, in addition to the effect of claim 1, a hologram transfer foil is provided in which the hologram does not whiten even when subjected to high heat of 150 to 170 ° C.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a sectional view of a hologram transfer foil showing one embodiment of the present invention.
FIG. 2 is an explanatory view for explaining the transfer of the hologram transfer foil of the present invention.

  (Hologram Transfer Foil) As shown in FIG. 1, the hologram transfer foil 1 of the present invention has a base material 11 and a release layer 13, a hologram layer 15, a transparent reflection layer 17, on at least one surface of the base material 11, The high-brightness ink layer 18 and the adhesive layer 19 are sequentially laminated as essential layers, and the layer structure of the substrate 11 / the release layer 13 / the hologram layer 15 / the transparent reflection layer 17 / the high-brightness ink layer 18 / the adhesive layer 19 To do. At the time of transfer, the release layer 13 / hologram layer 15 / transparent reflection layer 17 / high-brightness ink layer 18 / adhesive layer 19 is peeled from the substrate 11 to become the transfer layer 21. Other layers may be provided between the layers as needed, but at least one portion is directly between the hologram layer 15 and the transparent reflective layer 17 and between the transparent reflective layer 17 and the high-brightness ink layer 18. Just make sure they are in contact.

  In the hologram transfer foil 1 of the present invention, the release layer 13, the hologram layer 15, the transparent reflection layer 17, and the high-brightness ink layer 18 are essential layers. When an adhesive layer is provided on the transfer target side, the adhesive layer 19 does not have to be. The high-brightness ink layer 18 contains at least a metal vapor-deposited thin film surface-treated with an organic fatty acid, methylsilyl isocyanate, or a cellulose derivative, and the transparent reflective layer 17 uses a thin film of titanium oxide to form a hologram on a transfer target. When transferring the hologram using the transfer foil 1, the hologram does not whiten even under transfer conditions in which a heating stamper at 150 to 170 ° C. is pressurized at 50 to 500 kPa for 0.2 to 1.0 seconds and then peeled off at an acute angle. Even if bent, the hologram can be made difficult to whiten. If the hologram transfer foil 1 is used, a hologram having excellent design and / or security can be transferred to a transfer object without significant deterioration in appearance even when heated or bent. Further, even when the hologram is transferred to the transfer medium, even if it is subjected to high heat or bending external force, the hologram is not easily whitened and the appearance is not significantly deteriorated.

  Due to the synergistic effect of the hologram layer 15, the titanium oxide transparent reflection layer 17 and the high-brightness ink layer 18, it becomes a bright hologram that is not easily whitened even when subjected to high heat of 150 to 170 ° C. or bending force, and has the following two reasons: Guessed. One point is that since the thermal expansion coefficients of the hologram layer 15 and the high-brightness ink layer 18 are smaller than and close to those of aluminum, the fine irregularities that express the light diffraction effect of the hologram layer 15 have high heat and bending force. 2 points are that it can follow even if it is deformed. Titanium oxide of the transparent reflective layer 17 has high heat resistance, and even if some cracks are generated, it is transparent and not conspicuous. This is considered to be a synergistic effect because the reflectivity is maintained instead of the high-brightness ink layer 18.

  Moreover, the design of the hologram layer and / or the high-brightness ink layer may be any arbitrary design, and furthermore, the hologram design of the hologram layer and / or the design of the high-brightness ink layer may be arbitrarily combined. Thus, a hologram transfer foil 1 having a unique design that can give a story and a specific image can be obtained. In addition to its transparent reflective layer made of titanium oxide thin film by the conventional vacuum film-forming method, it can be formed by the printing method in existing equipment, can be produced in small lots, and can be produced at low cost. it can.

  (Substrate) As the substrate 11, various materials can be applied depending on the application. For example, polyester resins such as polyethylene terephthalate and polyethylene naphthalate, polyamide resins such as nylon 6, polyolefin resins such as polypropylene, cyclic polyolefin resins, vinyl resins such as polyvinyl chloride, acrylics such as polymethyl methacrylate, etc. Examples thereof include styrene-based resins such as cellulose resins, imide resins, polycarbonates, and ABS resins, and cellulose films such as cellulose triacetate. The substrate 11 may be a copolymer resin containing these resins as a main component, a mixture (including an alloy), or a laminate composed of a plurality of layers. The substrate 11 may be a stretched film or an unstretched film, but a film stretched in a uniaxial direction or a biaxial direction is preferable for the purpose of improving the strength. The thickness of the transfer substrate 21 is usually about 2.5 to 100 μm, preferably 4 to 50 μm, and most preferably 6 to 25 μm.

  The substrate 11 is used as a film, sheet or board formed of at least one layer of these resins. Usually, polyester-based films such as polyethylene terephthalate and polyethylene naphthalate have good balance in terms of strength, heat resistance and price, and are preferably used. Polyethylene terephthalate is particularly optimal.

  Prior to coating, the substrate 11 is applied to the coated surface by corona discharge treatment, plasma treatment, ozone treatment, flame treatment, primer (also called anchor coat, adhesion promoter, or easy adhesive) coating treatment, pre-heat treatment, dust removal. Easy adhesion treatment such as treatment, vapor deposition treatment, and alkali treatment may be performed. Moreover, you may add additives, such as a filler, a plasticizer, a coloring agent, and an antistatic agent, to this resin film as needed.

  (Peeling layer) As the peeling layer 13, the peeling layer 13 is provided on the surface of the substrate 11 on which the hologram layer 15 is formed in order to facilitate peeling. As the release layer 13, a release resin, a resin containing a release agent, a curable resin that is cross-linked by ionizing radiation, and the like can be used. Examples of the release resin include fluorine resin, silicone, melamine resin, epoxy resin, polyester resin, acrylic resin, and fiber resin. Resins containing a release agent include, for example, acrylic resins, vinyl resins, polyester resins, and fiber-based resins to which release agents such as fluorine resins, silicones, and various waxes are added or copolymerized. is there. Examples of the curable resin that is cross-linked by ionizing radiation include a resin containing a monomer / oligomer having a functional group that is polymerized (cured) by ionizing radiation such as ultraviolet (UV) or electron beam (EB).

(Hologram layer) The hologram layer 15 is colorless or colored, transparent or translucent, and may be a single layer or a multilayer, and a thermoplastic resin capable of reproducing irregularities by casting or embossing. A curable resin or a photosensitive resin composition capable of forming a cured portion and an uncured portion according to light diffraction pattern information can be used. Specifically, for example, thermoplastic resins such as polyvinyl chloride, acrylic (polymethyl methacrylate), polystyrene, or polycarbonate, unsaturated polyester, melamine, epoxy, polyester (meth) acrylate, urethane (meth) acrylate, epoxy ( It is a thermosetting resin such as (meth) acrylate, polyether (meth) acrylate, polyol (meth) acrylate, melamine (meth) acrylate, or triazine acrylate, each of which is a single, a thermoplastic resin, or a thermosetting resin. It may be a mixture of comrades or a mixture of a thermoplastic resin and a thermosetting resin. An ionizing radiation curable resin composition having a radically polymerizable unsaturated group and having thermoformability or a radically polymerizable unsaturated monomer added can also be used.
As the ionizing radiation curable resin, for example, an epoxy-modified acrylate resin, a urethane-modified acrylate resin, an acrylic-modified polyester, and the like can be applied, and a urethane-modified acrylate resin is preferable.

  Preferably, the material of the hologram layer 15 includes (1) an isocyanate having three or more isocyanate groups in the molecule, and (2) at least one hydroxyl group and at least two (meth) acryloyloxy groups in the molecule. Ionizing radiation curable resin containing urethane (meth) acrylate oligomer which is a reaction product of polyfunctional (meth) acrylates having one or polyhydric alcohols having at least two hydroxyl groups in the molecule (this specification) (Referred to as “ionizing radiation curable resin composition M”), reactive silicone and polyethylene wax. More preferably, a (meth) acrylate oligomer is also included and cured. What is necessary is just to harden with ionizing radiation, after apply | coating this composition and drying and shaping | molding the fine unevenness | corrugation relief which expresses a hologram function. The ionizing radiation curable resin is also called a crosslinkable resin, and the same applies to other layers.

  (Ionizing radiation curable resin composition M) The “ionizing radiation curable resin composition M” is a cured product of an ionizing radiation curable resin containing a urethane (meth) acrylate oligomer. The photocurable resin etc. which are indicated by 329031 gazette can be illustrated, and it mentions also in an example. That is, “ionizing radiation curable resin composition M” (1) isocyanates having 3 or more isocyanate groups in the molecule, (2) at least one hydroxyl group and at least two (meth) acryloyloxy groups in the molecule Reaction product of polyfunctional (meth) acrylates having, or (3) polyhydric alcohols having at least two hydroxyl groups in the molecule.

  ((Meth) acrylate oligomer) The (meth) acrylate oligomer may be a heat-resistant oligomer, and examples thereof include trade names of Nippon Synthetic Chemical Co., Ltd .; Purple light 6630B, 7510B, 7630B and the like.

  (Polyethylene wax) Polyethylene wax includes polyethylene resin particles and beads, and is preferably spherical beads. However, when polyethylene wax is added, the foil breakage is reduced, so the amount added is about 0.01 to 10 parts by weight, preferably 0.1 to 5 parts by weight, with respect to 100 parts by weight of ionizing radiation curable resin. And

  (Reactive silicone) Reactive silicone is a reactive silicone that reacts with and binds with resin when cured with ionizing radiation, and is modified by acrylic, methacrylic, or epoxy modification. The ratio on the basis of mass containing silicone is about 0.1 to 10 parts, preferably 0.3 to 5 parts relative to “ionizing radiation curable resin composition M” 100. If it is less than this range, peeling from the press stamper is insufficient at the time of relief molding, and it is difficult to prevent contamination of the press stamper and the moldability is poor. Further, beyond this range, the adhesiveness of the reflective layer to the hologram layer surface is low, and the commercial value is lost by peeling between the hologram layer and the reflective layer. Addition of conventional silicone oil has poor adhesion to the reflective layer.

  As described above, the hologram layer 15 includes the “ionizing radiation curable resin composition M”, and if necessary, (meth) acrylate oligomer, reactive silicone, and polyethylene wax, thereby providing relief moldability. It has a high light diffraction effect and can also serve as a hard coat function. In particular, by including polyethylene wax, the scratch resistance (scratch resistance) is remarkably improved.

(1) Since the coated film of the hologram layer 15 in a coated state before ionizing radiation curing is not sticky in a finger dry state and can be wound up without blocking, roll-to-roll processing can be performed.
(2) When reactive silicone is included in the hologram layer 15, the relief from the unevenness of the stamper gathers on the coating surface and the moldability is improved, and the relief structure can be easily molded, and ionization is performed after molding. When cured with radiation, the reactive silicone also cures.
(3) By including polyethylene wax, the hologram layer 15 becomes the outermost surface layer after transfer, but the solvent can be used even in extremely harsh environments, for a long period of time, and / or for many repeated uses. It protects the image provided on the transfer member from mechanical friction and abrasion, is hardly scratched and has excellent durability.

  (Formation of hologram layer) The hologram layer 15 contains the above-mentioned ionizing radiation curable resin, (meth) acrylate oligomer, reactive silicone, and polyethylene wax, if necessary, and a photopolymerization initiator as necessary. Add a plasticizer, stabilizer, surfactant, etc., disperse or dissolve in a solvent, apply by a known coating method such as roll coating, gravure coating, comma coating, die coating and dry to form a coating film. It ’s fine. The thickness of the hologram layer 15 is usually about 0.5 μm to 20 μm, preferably about 1 μm to 10 m, and may be applied multiple times.

  (Hologram) Next, on the surface of the hologram layer 15, a predetermined relief structure such as a hologram that exhibits a light diffraction effect is formed and cured. A hologram is a recording of interference fringes due to the interference of light between object light and reference light in an uneven relief shape, such as a laser reproduction hologram such as a Fresnel hologram, a white light reproduction hologram such as a rainbow hologram, There are color holograms utilizing the above principle, computer generated holograms (CGH), holographic diffraction gratings and the like. The relief shape is a concavo-convex shape, and is not particularly limited, and may have a fine concavo-convex shape such as light diffusion, light scattering, light reflection, light diffraction, etc., such as Fourier transform or lenticular lens. , A light diffraction pattern, and a moth eye. Further, although it does not have a light diffraction function, it may be a hairline pattern, a mat pattern, a line pattern, an interference pattern, or the like that expresses a unique glitter.

  As a method for producing these relief shapes, in addition to holograms and diffraction gratings produced using hologram photographing and recording means, holograms produced using an electron beam drawing device based on optical calculations such as interference and diffraction, A diffraction grating can also be mentioned. Also, a relatively large pattern such as a hairline pattern or a line pattern may be a machine cutting method. These holograms and / or diffraction gratings may be recorded single or multiple, or may be recorded in combination. These original plates can be prepared by known materials and methods, and usually, laser beam interference using a glass plate coated with a photosensitive material, using an electron beam drawing apparatus on a glass plate coated with an electron beam resist material. An electron beam drawing method for patterning can be applied.

  (Relief shaping) The relief shape is shaped (also referred to as replication) on the surface of the hologram layer 15. Hologram shaping can be formed by a known method. For example, when recording diffraction gratings or interference fringes of holograms as reliefs of surface irregularities, a master on which the diffraction gratings or interference fringes are recorded in irregularities is pressed. The concave / convex pattern of the original plate can be duplicated by using it as a mold and superimposing the original plate on the resin layer and then heat-pressing both of them with an appropriate means such as a heating roll.

  (Relief Curing) The hologram layer 15 is irradiated with ionizing radiation during or after embossing with a stamper to cure the ionizing radiation curable resin. The ionizing radiation curable resin becomes an ionizing radiation curable resin (hologram layer 15) when cured (reacted) by irradiation with ionizing radiation after the relief is formed. The ionizing radiation may be classified according to the quantum energy of the electromagnetic wave, but in this specification, all ultraviolet rays (UV-A, UV-B, UV-C), visible rays, gamma rays, X-rays, electrons It is defined as including a line. Accordingly, ultraviolet (UV), visible light, gamma ray, X-ray, electron beam, or the like can be applied as ionizing radiation, but ultraviolet (UV) is preferable. An ionizing radiation curable resin that cures with ionizing radiation may contain a photopolymerization initiator and / or photopolymerization accelerator in the case of ultraviolet curing, and may not be added in the case of high energy electron beam curing. Can be cured even with thermal energy.

  (Relief pattern) The pattern of the hologram layer 15 is not particularly limited, but may be an individual pattern or a pseudo-continuous pattern. When creating a press mold for the pseudo continuous pattern, a plurality of small relief plates may be matched with high accuracy so that the joints are not noticeable, or the joints are filled with resin. In this way, by using a quasi-continuous pattern, the area can be as large as possible, or preferably the entire surface. In the case of individual patterns, a registration mark synchronized with the pattern may be formed and transferred to a desired position on the transfer object.

(Transparent reflection layer) / Transparent reflection layer 17 has a substantially colorless and transparent hue, and its optical refractive index is different from that of the hologram layer. Since it can be visually recognized, a transparent hologram can be produced. For example, there are a thin film having a higher refractive index than the hologram layer 15 and a thin film having a lower refractive index. Examples of the former include ZnS, TiO ₂ , Al ₂ O ₃ , Sb ₂ S ₃ , SiO, SnO _2. ITO, etc., and examples of the latter include LiF, MgF ₂ , and AlF ₃ . Preferably, it is a metal oxide or nitride, specifically, Be, Mg, Ca, Cr, Mn, Cu, Ag, Al, Sn, In, Te, Fe, Co, Zn, Ge, Pb, Cd , Bi, Se, Ga, Rb, Sb, Pb, Ni, Sr, Ba, La, Ce, Au, and other oxides or nitrides, and the like may be a mixture of two or more thereof. Titanium oxide (TiO ₂ ) is preferred because of its large heat resistance and refractive index difference.

  The transparent metal compound is formed on the relief surface of the hologram layer 15 by vacuum such as vapor deposition, sputtering, ion plating, and CVD so that the thickness of the relief layer of the hologram layer 15 is about 10 to 2000 nm, preferably 20 to 1000 nm. It may be provided by a thin film method or the like.

  (High-Brightness Ink Layer) By providing the high-brightness ink layer 18 on the surface of the transparent reflection layer 17, the reproduced image of the hologram and / or the diffraction grating can be clearly seen. Conventionally, an aluminum metal thin film formed by a vacuum deposition method has been used as a metallic glossy reflection layer, except for a layer that exhibits a special function. In other aluminum foils, for example, rolled, metal gloss as high as that obtained by vacuum thin film method was not obtained. In addition, other metals have a color tone or are expensive. Thus, vacuum-deposited aluminum thin films have been used over a long period of time for a wide range of practical applications. Conventionally, there has been a printing ink that imparts a metallic luster. The ink is a metallic printing ink such as silver or gold using a metal pigment such as aluminum paste or aluminum powder. The aluminum paste has a leafing type and a non-leafing type, but using either of them did not reach the metallic luster of the metal thin film by the vacuum thin film method. Furthermore, although there was an ink using a powder obtained by pulverizing a vapor-deposited aluminum thin film, the surface treatment was different and the dispersibility was poor, and sufficient high luminance could not be obtained.

  However, in the present invention, the transparent reflective layer 15 and a metallic ink layer (high luminance) printed using a high luminance ink containing a metal vapor-deposited film strip surface-treated with at least an organic fatty acid, methylsilyl isocyanate or a cellulose derivative. It has been found that when used in combination with the ink layer 18), it becomes difficult to whiten even when heated or bent, resulting in a bright hologram transfer foil.

  The metallic ink layer is a printing layer using a printing ink that gives a metallic luster-like appearance (metallic tone), and is a vapor-deposited metal obtained by pulverizing a vapor-deposited metal film that has been surface-treated with at least an organic fatty acid, methylsilyl isocyanate, or a cellulose derivative. It is a printing layer using the high-intensity ink containing the film strip. Since it is a printing method, it may be provided partially, and a high-brightness ink reflecting layer can be manufactured at low cost with existing printing equipment. By printing the metallic print layer 17 using a high-brightness ink composed of a metal thin film piece and a binder on the surface of the transparent reflection layer 15, it is possible to exhibit a higher metallic tone and to provide a reflection layer for a light diffraction image. In addition, it is highly designable, and it is possible to easily determine whether it is true or false by visual inspection, so that security is enhanced, small lot production can be handled, and cost can be reduced. In addition, since the high-brightness ink layer 18 is a printing method, if there is another print layer, it is easy to provide a high-brightness ink layer in synchronization with this print pattern. The design effect is further enhanced by providing the printed pattern so as to be synchronized. The term “partial” refers to all patterns such as letters, numbers, symbols, illustrations, patterns, and photographs.

  In addition, an aluminum metal thin film formed by a conventional vacuum deposition method can provide a sufficient metallic luster. However, in order to enhance the design, in order to provide a partial aluminum metal thin film, once the aluminum metal thin film is provided on the entire surface by a vacuum film forming method, a resist is printed and etched in a separate process. The cost is very high, and the number of manufacturing processes increases, making it unsuitable for small lot production. In addition, there is a drawback of whitening when bent at high temperatures.

  (High-brightness ink) By using two layers of the transparent reflection layer 15 and the high-brightness ink layer 18, the light diffraction image of the bright hologram transfer foil layer 15 can be visually recognized. The high-brightness ink is a high-brightness ink having a metallic luster comparable to a metal vapor-deposited film. The surface of the metal vapor-deposited film strip is treated with an organic fatty acid, methylsilyl isocyanate, or a cellulose derivative, and dispersed in the ink. The metallic luster of the ink coating film is increased in brightness. The ink is composed of a metal vapor-deposited film strip treated with an organic fatty acid, methylsilyl isocyanate, or a cellulose derivative, a binder, an additive, and a solvent. If necessary, it can be converted into a gravure ink, a screen ink, or a flexo ink. Good.

  As the metal of the metal vapor deposited film strip, aluminum can be applied, but gold, silver, copper, brass, titanium, chromium, nickel, nickel chromium, stainless steel, etc. can also be used as necessary. The thickness of the metal vapor deposition film is preferably 0.01 to 0.1 μm, more preferably 0.03 to 0.08 μm, and the size of the metal vapor deposition film dispersed in the ink is 5 to 25 μm. Is more preferable, and it is 10-15 micrometers more preferably. If the size is less than this range, the brightness of the ink coating will be insufficient, and if it exceeds this range, it will be difficult to enter the gravure plate cell, the screen plate will be clogged easily, and the gloss of the printed coating will decrease. To do.

  The metal vapor deposited film strip is first prepared as a vapor deposited film consisting of polyester film / release layer / deposited film / antioxidation top coat layer on the surface. The release layer and the topcoat layer are not particularly limited, and for example, cellulose derivatives, acrylic resins, chlorinated polypropylene, and the like can be applied. The vapor deposition film is immersed in a solvent, and the metal vapor deposition film is peeled, stirred, filtered and dried to obtain metal vapor deposition film strips. While stirring the metal vapor-deposited film strip at a temperature of 10 to 35 ° C. for about 30 minutes, an organic fatty acid, methylsilyl isocyanate or cellulose derivative solution is added, and the organic fatty acid, methylsilyl isocyanate or cellulose is added to the surface of the metal vapor-deposited film strip. The derivative is adsorbed and the surface treatment of the metal vapor deposited film strip is performed. As the cellulose derivative, nitrocellulose, cellulose acetate propionate, cellulose acetate butyrate, ethyl cellulose and the like can be applied. When the metal is aluminum, the addition amount of the cellulose derivative is preferably 1 to 20% by mass with respect to the deposited film strip.

  After the surface treatment, the metal vapor-deposited film strips are separated, or the metal vapor-deposited film strip slurry is blended and dispersed in a binder and a solvent as they are to make an ink. As the binder, known inks may be used, and examples thereof include (meth) acrylic resin, polyester, polyamide, polyurethane, shellac, and alkyd resin. If necessary, additives such as coloring pigments, dyes, waxes, plasticizers, leveling agents, surfactants, dispersants, antifoaming agents, and chelating agents may be added to the ink. As the ink solvent, known ink solvents can be used, for example, aromatic hydrocarbons such as toluene and xylene, aliphatic or alicyclic hydrocarbons such as n-hexane and cyclohexane, ethyl acetate, acetic acid, and the like. Examples thereof include esters such as propyl, alcohols such as methanol, ethanol and IPA, ketones such as acetone and MEK, alkylene glycol monoalkyl ethers such as ethylene glycol monoethyl ether and propylene glycol monomethyl ether.

  Ordinary inks are kneaded by a roll mill, a ball mill, or the like, and the pigment additive is finely dispersed to sub-micron and highly dispersed to give printability. However, the high-intensity ink used in the present invention does not require a kneading step, and can be dispersed only by mixing with a stirrer, and the metallic luster is not impaired. That is, in order to develop a high-brightness metallic luster, the metal vapor-deposited film strip needs to have a size of about 5 to 25 μm, and when the kneading step is performed, the metallic luster is extremely lowered.

  (High-brightness ink printing) If the ink obtained as described above is made by known gravure printing, screen printing, or flexographic printing, the required pattern is made, printed, dried, and cured if necessary. Good. In this way, a high-intensity ink layer 18 of a partial or arbitrary image is obtained.

(Adhesive layer) An adhesive layer 19 is provided on the surface facing the transfer target. As the material of the adhesive layer 19, a known heat-sensitive adhesive which melts or softens when heated and exhibits an adhesive effect can be applied. Specifically, vinyl chloride vinyl acetate copolymer resin, acrylic resin, polyester Based resins and the like. The material resin is dissolved or dispersed in a solvent, an additive such as a pigment is added as appropriate, and it is applied by a method such as known roll coating or gravure coating and dried to have a thickness of about 0.1 to 30 μm, preferably Is a layer of 0.5 to 10 μm.
As the material of the adhesive layer 19, a known heat-sensitive adhesive that melts or softens when heated and exhibits an adhesive effect can be applied. Specifically, a vinyl chloride vinyl acetate copolymer resin, an acrylic resin, a polyester-based resin can be used. Resin etc. are mentioned. The material resin is dissolved or dispersed in a solvent, an additive such as a pigment is added as appropriate, and it is applied and dried by a known method such as roll coating or gravure coating to form a layer having a thickness of 0.1 μm to 30 μm. obtain.

  (Transfer method) As a method of forming the hologram transfer foil 1 on the transfer object, a known transfer method may be used, for example, hot stamping (foil stamping) by thermal stamping (stamper), entire surface or stripe transfer by a hot roll, thermal A known method such as a thermal printer (also called a thermal transfer printer) using a head (thermal printing head) can be applied. Any shape such as a spot shape, letters, numbers, and illustrations may be transferred.

  (Transfer conditions) Usually, as shown in FIG. 3, the transfer is often performed by hot stamping (foil stamping), and the heated stamper is moved up and down and pressed at a predetermined pressure for several seconds and then peeled off. Done in In the operation of transferring the hologram to the transfer target using the hologram transfer foil, it is preferable from the viewpoint of production efficiency to pressurize at a high temperature for a short time. If the temperature of the heating stamper is increased, the work can be performed in a short time. However, when exposed to high heat, cracks are likely to occur in the metal thin film, and the light is irregularly reflected by the cracks, resulting in whitening of the hologram and a significant deterioration in the appearance. In general, the stamper temperature was a transfer condition in which a heated stamper at 110 to 140 ° C. was pressed at a pressure of 50 to 500 kPa for 1 to 5 seconds and then peeled off. According to the hologram transfer foil 1 of the present invention, the hologram can be transferred without whitening even under transfer conditions in which a heating stamper at 150 to 170 ° C. is pressurized at 50 to 500 kPa for 0.2 to 1.0 seconds and then peeled off. That is, the production efficiency is improved at a high speed, and the production can be performed at a low cost.

(Bending) The conventional metallic reflective layer is very bright with a silvery metallic luster, but when it is bent at an acute angle by external force, many cracks occur in the metal thin film, and the light is irregularly reflected at many fine cracks. In some cases, the hologram is whitened, the appearance is remarkably deteriorated, and the hologram image cannot be observed at all. However, according to the hologram transfer foil 1 of the present invention, even if the hologram transfer foil 1 is bent along an acute angle, the hologram is hardly whitened and the appearance is not significantly deteriorated.
The reason is that even if a slight crack (crack) enters the titanium oxide of the transparent reflective layer 17, it is transparent and not conspicuous, and the reflectivity of the crack portion is replaced by the reflection of the high-brightness ink layer 18 below the reflectivity. It seems that it is maintained. Therefore, it is possible to transfer a hologram in which design properties and / or security properties are maintained to a transfer target. Further, the hologram is not easily whitened even when it is transferred to the transfer object or subjected to high heat or bending force, and the appearance is not significantly deteriorated.

  (Transfered material) The material to be transferred 101 is not particularly limited, for example, natural fiber paper, coated paper, tracing paper, plastic film that is not deformed by heat during transfer, glass, metal, ceramics, wood, cloth, etc. Any of these media may be used. Further, at least a part of the medium of the transfer target 101 may be subjected to image, coloring, printing, or other decoration. In particular, when the material to be transferred 101 is paper, the stamper is heated at a high temperature so that the adhesive layer penetrates well into the surface of the paper and the adhesive strength is improved. Therefore, it is preferable to use the hologram transfer foil 1 of the present invention. . In addition, since the paper surface is uneven and uneven, it is preferably used because the brightness of the hologram tends to decrease.

  EXAMPLES Hereinafter, although an Example and a comparative example demonstrate this invention further in detail, it is not limited to this.

Example 1 Using a PET film having a thickness of 25 μm as the base material 11, a TCM01 medium (manufactured by Dainippon Ink Co., Ltd., melamine resin product name) coating liquid is applied to one surface of the base material 11 by a gravure coating method. After being dried, it was applied to a thickness of 2 μm, dried, and baked at 180 ° C. for 20 seconds to form a release layer 13.
The surface of the release layer 13 was coated with the following ionizing radiation curable resin composition with a gravure reverse coater so that the thickness after drying was 2 μm and dried at 100 ° C.
・ <Procedure for producing ionizing radiation curable resin composition>
First, “ionizing radiation curable resin composition M” was produced by the following procedure. A reactor equipped with a stirrer, reflux condenser, dropping funnel and thermometer was charged with 206.1 g of ethyl acetate and 133.5 g of isophorone diisocyanate trimer (HULS product, VESTANAT T1890, melting point 110 ° C.), 80 The solution was heated to 0 ° C. and dissolved. After air was blown into the solution, 0.38 g of hydroquinone monomethyl ether, 249.3 g of pentaerythritol triacrylate (product of Osaka Organic Chemical Industry Co., Ltd., Biscoat 300) and 0.38 g of dibutyltin dilaurate were charged. After reacting at 80 ° C. for 5 hours, 688.9 g of ethyl acetate was added and cooled.
The “ionizing radiation curable resin composition M”, a film-forming resin (acrylic oligomer), a reactive silicone, a polyethylene wax, a photopolymerization initiator, and a solvent are blended in the following composition to form an ionizing radiation curable resin. A composition was prepared.
・ <Ionizing radiation curable resin composition of hologram layer>
“Ionizing radiation curable resin composition M” 25 parts by mass Methacrylate oligomer (manufactured by Nippon Synthetic Chemical Co., Ltd., trade name Murasaki 6630B) 5 parts by weight of reactive silicone (manufactured by Shin-Etsu Chemical Co., Ltd., trade name X-22-2445) 0. 2 parts by mass Polyethylene wax (average particle size 2.0 m) 0.3 parts by mass Photopolymerization initiator (trade name Irgacure 907, manufactured by Ciba) 0.9 parts by mass Ethyl acetate 70 parts by mass From a fine concavo-convex pattern, a press die with a pseudo-continuous pattern duplicated by the 2P method from a diffraction grating by the beam interference method is attached to an embossing roller of a duplicating apparatus, and heated and pressed (embossed) with an opposing roller. A relief was formed. Immediately after shaping, it was cured by irradiating with ultraviolet rays using a high-pressure mercury lamp.
Titanium oxide with a thickness of 50 nm was formed on the relief surface of the hologram layer 15 by a vacuum deposition method to form a transparent reflective layer 17.
Using a fine wrap super metallic silver ink (manufactured by Dainippon Ink & Chemicals, Inc., trade name of high-brightness ink), printed on the surface of the reflective layer 17 by gravure printing so that the thickness after drying is 5 μm. A high-brightness ink layer 18 was formed.
On the surface of the high-brightness ink layer 18, the following adhesive layer composition was applied with a gravure coater so that the coating amount after drying was 1 μm and dried at 100 ° C. to form an adhesive layer 19. A hologram transfer foil 1 of Example 1 having a layer structure of material 11 / peeling layer 13 / hologram layer 15 / transparent reflective layer 17 / high brightness ink layer 18 / adhesive layer 19 was obtained.
・ <Adhesive layer composition>
Polyester resin P-170 (manufactured by Nippon Synthetic Chemical Co., Ltd., trade name) 20 parts by mass Microsilica (average particle size 0.5 μm) 10 parts by mass Solvent (MEK: toluene = 1: 1) 70 parts by mass

  (Comparative example 1) Instead of the transparent reflective layer 17, aluminum having a thickness of 200 nm was formed by a vacuum deposition method to form a metal reflective layer, and the same as in Example 1 except that the high-brightness ink layer 18 was not provided. The hologram transfer foil 1 of the comparative example 1 which consists of a layer structure of the base material 11 / release layer 13 / hologram layer 15 / metal reflective layer / adhesive layer 19 was obtained.

  (Comparative example 2) Comparative example consisting of the layer structure of substrate 11 / peeling layer 13 / hologram layer 15 / transparent reflective layer 17 / adhesive layer 19 in the same manner as in Example 1 except that the high-brightness ink layer 18 is not provided. 2 of hologram transfer foil 1 was obtained.

(Evaluation methods)
The heat resistance was evaluated by a transfer test.
The transfer test was carried out by using a stamper manufactured by Navitas as a transfer machine, and facing the hologram transfer foils of Examples and Comparative Examples on a high-quality paper surface having a basis weight of 300 g / m ² as a transfer target. The temperature is changed, the pressure is 200 kPa, the pressure is transferred for 0.5 seconds, and the transfer is performed under the peeling condition. The whitened state of the transferred hologram is visually observed. In the case where the appearance is deteriorated and the appearance is deteriorated, the result is rejected with “Δ”, and the material that is markedly changed and whitened is indicated as “failed” and indicated with “X”. In addition, the hologram transfer foil 1 of Comparative Example 2 is a transparent hologram and does not whiten, but was determined by estimation from the state of cracks.

  (Evaluation results) Regarding heat resistance, Example 1 was acceptable with a circle at 150 ° C and 160 ° C, and failed with a Δ mark at 180 ° C. Comparative Examples 1 and 2 failed at ΔC at 150 ° C. and 160 ° C., and failed at X at 180 ° C. Incidentally, at 130 ° C., all of them were poorly bonded to the transfer target.

It is sectional drawing of the hologram transfer foil which shows one Example of this invention. It is explanatory drawing explaining transfer of the hologram transfer foil of this invention.

Explanation of symbols

1: Hologram transfer foil 11: Base material 13: Release layer 15: Hologram layer 17: Transparent reflection layer 18: High-brightness ink layer 19: Adhesive layer 21: Transfer layer 101: Transfer object

Claims (2)

In a hologram transfer foil in which a release layer, a hologram layer, a transparent reflective layer, a high-brightness ink layer, and an adhesive layer are sequentially laminated on at least one surface of the base material, the high-brightness ink layer is at least organic A hologram transfer foil comprising metal vapor-deposited film strips surface-treated with a fatty acid, methylsilyl isocyanate, or a cellulose derivative, and wherein the transparent reflective layer is titanium oxide. When transferring a hologram to a transfer object using a hologram transfer foil, the hologram is whitened even under transfer conditions in which a heating stamper at 150 to 170 ° C. is pressed at 50 to 500 kPa for 0.2 to 1.0 seconds and then peeled off. The hologram transfer foil according to claim 1, wherein the hologram transfer foil is not.

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