JP4797834B2 - Hologram transfer foil - Google Patents

Description

  The present invention relates to a hologram transfer foil, and more particularly to a hologram transfer foil capable of transferring a hologram having excellent durability such as scratch resistance, design and / or security with good transferability.

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, synonym, functional expression, common name, or industry term for “polyethylene terephthalate”.

  (Main applications) Main applications of products transferred using the hologram transfer foil of the present invention include ID cards such as employee cards, membership cards, student cards, gift certificates, admission cards, pass cards, service points, Media that proves the rights and qualifications that paid a certain amount of money (called prepaid) can be applied. However, it is not particularly limited as long as it is excellent in design and security, and is required to have durability such as abrasion resistance.

(Background Art) Conventionally, gold vouchers, cards, and various certificates have qualifications and certain economic values and effects, so that they are constantly counterfeited, altered, and used illegally. In particular, the accuracy of color copiers is remarkably improved, making it easy to forge various media.
In order to prevent this, various forgery prevention means are provided. Transfer foils with relief, especially holograms and diffraction gratings, have a design that can express unique decorative images and three-dimensional images, and these holograms and diffraction gratings require advanced manufacturing techniques and cannot be easily manufactured. Therefore, it is used to improve security to prevent forgery.
Cards such as those described above are excellent in design and security, but they are often rubbed or peeled off by repeated use due to repeated use. -There arises a problem that the design and security as a whole are impaired. This problem can be solved by increasing the thickness of the protective layer (also referred to as a hard coat layer or OP layer) or by using a cured resin, but the foil sharpness at the time of transfer is poor and the transferability is significantly reduced. There are also problems.
Accordingly, the hologram transfer foil has high durability such as sufficient scratch resistance even with only a hologram layer excellent in design and / or security without providing a separate protective layer, and is transferred to a medium such as a card. It is required that the film can be transferred with good transferability, such as foil cracks. In addition, a hologram layer with high durability such as scratch resistance can be considered, but since the formability is remarkably deteriorated, the hologram layer also exhibits the hologram function with such a high durability (hard coat function). It is also demanded that fine irregularities to be easily formed.

(Prior Art) Conventionally, a protective layer is provided on the surface side of the hologram layer of the hologram transfer foil to provide peelability between the base film and the hologram forming layer, and also to protect the hologram forming layer on the surface after transfer. As the material, acrylic resin, cellulose resin, vinyl resin, polyester resin, urethane resin, olefin resin, amide resin, ebokine resin and the like are known (for example, (See Patent Documents 1 and 2.)
However, since these protective layers are provided separately from the hologram layer, there is a disadvantage that the productivity is low and the cost is high.

JP-A-61-160481 JP 2004-188799 A

  Accordingly, the present invention has been made to solve such problems. Its purpose is to provide a high durability such as scratch resistance even with a hologram layer that is excellent in design and / or security without providing a separate protective layer, and is a foil for transfer to a medium such as a card. A hologram layer with high transferability, such as sharpness, and high durability, such as scratch resistance, has poor formability. It is to provide a hologram transfer foil that is easy to mold.

In order to solve the above problems, a hologram transfer foil according to the invention of claim 1 is provided with a base material and at least a release layer, a hologram layer, a reflective layer and an adhesive layer on one surface of the base material. In the hologram transfer foil, the release layer is a melamine resin, the hologram layer contains a cured product of an ionizing radiation curable resin and a reactive silicone, and polyethylene wax, and the ionizing radiation curable resin is (1) molecule. Isocyanates having 3 or more isocyanate groups, (2) Polyfunctional (meth) acrylates having at least one hydroxyl group and at least two (meth) acryloyloxy groups in the molecule, or (3) In the molecule hydroxyl containing the reaction products of polyhydric alcohols are urethane (meth) acrylate oligomer having at least two, said hologram Layers in which pencil hardness conforming to JIS-K5400 is characterized in that it also serves as a hard coat function having the above H.
The hologram transfer foil according to the invention of claim 2 is such that the content of polyethylene wax in the hologram layer is based on mass and ionizing radiation curable resin: polyethylene wax = 100: 0.01-10.

According to the first aspect of the present invention, a medium such as a card having high durability such as sufficient scratch resistance even with a hologram layer excellent in design and / or security without providing a separate protective layer. to be able to transfer good transferability, such as foil sharp when transferring easily hologram transfer foil embossing fine irregularities hologram functions are provided to holograms layer.
According to the second aspect of the present invention, in addition to the effect of the first aspect , there is provided a hologram transfer foil that can be transferred with good transferability such as a foil sharpness when transferring to a medium such as a card.

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 shows a transfer object transferred using the hologram transfer foil of the present invention.

  (Transfer foil) As shown in FIG. 1, the hologram transfer foil of the present invention comprises a base material 11 and at least a release layer 13, a hologram layer 15, a reflective layer 17 and an adhesive layer 19 on one surface of the base material 11. Is provided. Furthermore, you may provide another layer as needed. For example, the layer configuration may be substrate 11 / release layer 13 / hologram layer 15 / reflection layer 17 / other functional layers (if necessary) / adhesion layer 19. The other functional layers may be arranged at any positions other than the base material 11 / release layer 12 / release layer 13 layer. Although it does not specifically limit as another functional layer, For example, a peeling layer, a printing pattern layer, an ultraviolet absorption layer etc. can be illustrated.

The release layer 13 is a melamine resin, and the hologram layer 15 includes an ionizing radiation curable resin and a cured product of reactive silicone, and polyethylene wax, and also has a hard coat function. The hologram layer 15 is a hologram layer 15 having high durability such as scratch resistance (also referred to as scratch resistance) and wear resistance (that is, also serving as a hard coat layer). Therefore, a hologram transfer foil having excellent design and / or security can be obtained without providing a separate durable protective layer.
Even when only the hologram layer 15 having no protective layer on the surface is transferred, the hologram layer 15 has sufficient durability such as scratch resistance, abrasion resistance, scratch resistance and the like, and is transferred to a medium such as a card. Can be transferred with good transferability due to good foil sharpness.

  (Substrate) As the substrate 11, various materials can be applied depending on the use as long as the substrate 11 has heat resistance, mechanical strength, mechanical strength to withstand manufacturing, solvent resistance, and the like. For example, polyester resins such as polyethylene terephthalate / polybutylene terephthalate / polyethylene naphthalate, polyamide resins, vinyl resins such as polyvinyl chloride, acrylic resins, imide resins, engineering resins such as polyarylate, polycarbonate, cellophane, etc. Cellulosic film. The substrate 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. Usually, polyester films such as polyethylene terephthalate and polyethylene naphthalate are preferably used because of their good heat resistance and mechanical strength, and polyethylene terephthalate is most suitable.

  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 base material is usually about 2.5 to 50 μm, preferably 2.5 to 12 μm, and most preferably 4 to 6 μm. 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, as needed.

  (Release layer, release layer) In order to improve the releasability at the time of transfer, a release layer 13 may be provided, and if necessary, a release layer 14 may be provided. Both of the release layer 13 and the release layer 14 The transferability can be further improved by providing.

  (Release layer) The release layer 13 usually includes a release resin, a resin containing a release agent, a curable resin that is cross-linked by ionizing radiation, etc. In the present invention, a melamine resin is used, which will be described later. By combining with the hard coat layer 15 to be peeled off, the separation between the release layer 13 and the hard coat layer 15 is stabilized, and the foil breakage during transfer can be remarkably improved.

  The release layer 13 is formed by dispersing or dissolving the resin in a solvent, applying and drying the resin by a known coating method such as roll coating or gravure coating, and baking at a temperature of about 150 ° C to 200 ° C. The thickness of the release layer 13 is usually about 0.01 μm to 5.0 μm, preferably about 0.5 μm to 3.0 μm.

  (Peeling layer) As the peeling layer 14, an acrylic resin, vinyl resin, polyester resin, fiber resin, wax, melamine to which a release agent such as fluorine resin, silicone, various waxes is added or copolymerized is used. In the case where both the release layer 13 and the release layer 14 are provided, they may be used in appropriate combination. In this case, the release layer 14 also has a function as a protective layer after transfer.

(Hologram Layer) The hologram layer 15 includes at least an ionizing radiation curable resin and a cured product of reactive silicone, and polyethylene wax.
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) The term “ionizing radiation curable resin composition M”) and a cured product of reactive silicone, and polyethylene wax are included. 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.

(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.

  In this way, the hologram layer 15 includes “ionizing radiation curable resin composition M”, (meth) acrylate oligomer and a cured product of reactive silicone, and polyethylene wax as necessary. Good formability, high optical diffraction effect, and can also serve as a hard coat function.

(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) The reactive silicone is included in the hologram layer 15 so that the moldability is good, so that the relief structure can be easily molded and cured with ionizing radiation after molding.
(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 support from mechanical friction and abrasion, and is resistant to scratches and has excellent durability.
(4) Since the hologram layer 15 is in contact with the release layer 13 using the melamine-based resin, it peels between the hologram layer 15 and the release layer 13 and has a stable release property. The foil breakage is good and the occurrence of burrs can be extremely reduced.

  (Formation of hologram layer) The hologram layer 15 contains the above-mentioned ionizing radiation curable resin, (meth) acrylate oligomer, reactive silicone, and polyethylene wax as required, and further, if necessary, a photopolymerization initiator, A plasticizer, stabilizer, surfactant, etc. are added, dispersed or dissolved in a solvent, applied by a known coating method such as roll coating, gravure coating, comma coating, die coating, and dried 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 plate on which the diffraction gratings or interference fringes are recorded in irregularities is pressed. The concave / convex pattern of the original can be duplicated by using it as a mold (referred to as a stamper) and by superimposing the original on the resin layer and 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 rays, X-rays, or electron beams can be applied as ionizing radiation, but ultraviolet (UV) is preferred. An ionizing radiation curable resin that is cured by ionizing radiation may contain a photopolymerization initiator and / or a 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 is preferably a pseudo-continuous pattern. When creating a press mold (referred to as a stamper) for the pseudo continuous pattern, it is only necessary to match a plurality of small relief plates with high accuracy to make the joints inconspicuous, or to fill the joints with resin. In this way, by using a quasi-continuous pattern, the area can be as large as possible, or preferably the entire surface.

  (Reflection layer) Since the reflection layer 17 is provided on the reflection layer 17 on the relief surface of the hologram layer 15 provided with a predetermined relief structure, the reflection reflection and / or diffraction effect is enhanced. If a rate is higher, it will not specifically limit, For example, a metal thin film can be applied. As the reflective layer 17, a metal layer or a transparent layer can be usually applied, but when the support 101 has the image 105 such as an ID card, a transparent layer capable of observing the image 105 is preferable. When the image 105 is not provided on the support 101 or when transferring to a part of the support 101, an opaque metal layer may be used.

  The metal used for the reflective layer 17 is a metal element thin film that has a metallic luster and reflects light, such as Cr, Ni, Ag, Au, Al, etc., and oxides, sulfides, nitrides thereof, etc. A thin film may be used alone or in combination. The formation of the light-reflective metal thin film can be obtained by a vacuum thin film method such as a vacuum deposition method, a sputtering method, or an ion plating method so as to have a thickness of about 10 to 2000 nm, preferably 20 to 1000 nm. However, it can also be formed by plating. If the thickness of the reflective layer 17 is less than this range, the light is transmitted to some extent and the effect is reduced, and if it is more than that, the reflective effect is not changed, which is wasteful in cost.

Further, the reflective layer 17 has a substantially colorless and transparent hue, and its optical refractive index is different from that of the hologram layer. A simple 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. Also, a general light-reflective metal thin film such as aluminum can be used when it has a thickness of 200 mm or less.

  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. Furthermore, a transparent synthetic resin having a refractive index different from that of the hologram layer 15 may be used. When the refractive index of the adhesive layer 19 material and the hologram layer 15 material is sufficiently different, the adhesive layer 19 is a reflective layer. 19 can also be used.

(Adhesive layer) As the adhesive layer 19, a heat-sensitive adhesive that melts or softens when heated and exhibits an adhesive effect can be applied. Specifically, a vinyl chloride resin, a vinyl acetate resin, or vinyl chloride. Examples thereof include vinyl acetate copolymer resins, acrylic resins, and polyester resins. The adhesive layer 19 preferably contains a filler such as microsilica in terms of the ability to break the foil. Further, the resin of the adhesive layer 19 is preferably one having a melting point of 60 to 95 ° C. which melts and adheres at a low temperature of about 95 ° C. and solidifies and adheres at about 60 ° C. When the melting point is less than the above range, the adhesion to the support is insufficient, and the temperature at which the formed image is used is limited. On the other hand, if the melting point exceeds the above range, the transferability becomes insufficient by heating with a thermal head, the foil breakability of the hard coat layer is lowered, and transfer with good resolution becomes difficult.
The material resin is dissolved or dispersed in a solvent, an additive such as a pigment is added as appropriate, and the layer is applied and dried by a known method such as roll coating, gravure coating, or comma coating, and a layer having a thickness of 1 to 30 μm Get.

  (Transfer) Using the hologram transfer foil 10 of the present invention thus obtained, the hologram layer 15 and the adhesive layer 19 are transferred to the surface of the image 105 formed on the support 101 as shown in FIG. To do. In addition, although it peels between the mold release layer 13 and the hologram layer 15 at the time of transcription | transfer, a part of mold release layer 13 may transfer to the hologram layer 15 slightly, but it is in the scope of the present invention.

  (Transfer method) As a method for forming the support 101, a known transfer method may be used. For example, hot stamping by hot stamping (foil stamping), whole surface or stripe transfer by a heat roll, thermal by a thermal head (thermal printing head). A known method such as a printer (also referred to as a thermal transfer printer) can be applied. Any shape such as a spot shape, letters, numbers, and illustrations may be transferred. A thermal printer capable of continuously operating variable information such as a face photograph having a different arbitrary shape or printing on demand is preferable.

In addition, as described in the background art, sufficient durability has not yet been obtained in use in extremely harsh environments, long-term expiration dates, and / or many repeated uses. The hard coat layer and the hologram layer of the present invention may also be thickened. However, since the foil breakage is remarkably deteriorated when the thickness is thickened, a protective layer is separately stacked and transferred twice. According to the hologram transfer foil 10 of the present invention, the hologram layer 15 having high image protection and security is excellent in peelability and foil breakability, and can be transferred only once.
The hologram layer 15 comes to be positioned on the outermost surface, protects the image provided on the support from solvent, mechanical friction, and abrasion, and is hard to be damaged, and durability is increased.
In this way, because it can be protected from mechanical and chemical damage for a long period of time, gas station cards and construction site cards that are used in extremely harsh environments, long-term entry / exit cards and point cards It can also be suitably used for an entrance / exit card that repeatedly enters and exits a number of security-controlled rooms such as financial institutions.

  (Support) The support 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, or dye acceptance Any medium may be used, and it may be appropriately selected depending on the application. Further, at least a part of the medium of the support 101 may be subjected to image, coloring, printing, or other decoration. Although FIG. 2 illustrates an image formed on the image receiving layer 103 by an image formed by a sublimation transfer type thermal transfer method, it is not limited to the presence or absence of the image receiving layer 103.

(Image) A particularly preferable image 105 is an image having inferior durability, for example, a long thermal transfer film in which a large number of colored thermal transfer layers of yellow, magenta, and cyan (and black if necessary) are repeatedly provided in the surface order. 3 is an image obtained by a thermal transfer method of a melt transfer type or a sublimation transfer type. In the case of creating an ID card such as an ID card, in the case of the melt transfer type, it is easy to form images such as letters and numbers, but these images have durability, particularly friction resistance. There is a disadvantage of being inferior. On the other hand, in the case of the sublimation transfer type, it is possible to form a gradation image such as a facial photograph, but unlike the normal printing ink, the formed image has no vehicle, so light resistance, weather resistance, There is a problem that durability such as friction resistance is inferior.
The image is transferred to the surface using the hologram transfer foil 10 of the present invention, so that the hologram layer 15 serving also as a hard coat layer is located on the outermost surface, protecting the image, enhancing the durability, and It also has both high design and security.

(Durability) The pencil hardness test of the hologram layer 15 was measured according to JIS-K5400 and had a hardness of H or higher.
In addition, the scratch strength of the hologram layer 15 is 150 g or more, preferably 200 g or more, from the viewpoint of sufficient friction resistance on the surface.
The scratch strength was measured using a wear resistance tester (HEIDON-18) on a sample conditioned at 23 ° C. and 55% RH for 24 hours, with a 0.8 mmφ sapphire needle at a right angle. As a result, the load applied to the sapphire needle was gradually increased from 0 g to 200 g, and the load when the surface began to be scratched was measured while sliding and moving the sample surface at 60 cm / min. The larger the load, the better.

  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 080 ° 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 blowing air into the solution, 0.38 g of hydroquinone monomethyl ether, 249.3 g of pentaerythritol triacrylate (product of Osaka Organic Chemical Industry Co., Ltd., Viscoat 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 μm) 0.3 parts by mass Photopolymerization initiator (Ciba, trade name Irgacure 907) 0.9 parts by mass Ethyl acetate 70 parts by mass Next, to the layer surface, 2 A stamper with a quasi-continuous pattern duplicated from the diffraction grating by the beam interference method by the 2P method is attached to the embossing roller of the duplicating apparatus, and is heated and pressed (embossed) with the opposing roller to form a fine uneven pattern. The relief was shaped. Immediately after shaping, it was cured by irradiating with ultraviolet rays using a high-pressure mercury lamp.
A reflective layer 17 was formed by forming a 50 nm thick titanium oxide thin film on the relief surface of the hologram layer 15 by vacuum deposition.
The following adhesive layer composition was applied to the surface of the reflective layer 17 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. The hologram transfer foil 10 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

Example 2 A hologram transfer foil 10 of Example 2 is obtained in the same manner as Example 1 except that the ionizing radiation curable resin composition described below is used as the ionizing radiation curable resin composition of the hologram layer 15. It was.
・ <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: Murasakimitsu 7510B) 5 parts by mass of reactive silicone (manufactured by Shin-Etsu Chemical Co., Ltd., trade name: X-22-1602) 2 parts by mass Polyethylene wax (average particle size 2.0 μm) 2 parts by mass Photopolymerization initiator (Ciba, trade name Irgacure 907) 0.9 parts by mass Ethyl acetate 70 parts by mass

(Comparative Example 1) A hologram transfer foil of Comparative Example 1 was obtained in the same manner as in Example 1 except that the following ionizing radiation curable resin composition was used as the ionizing radiation curable resin composition of the hologram layer 15. .
・ <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 weight Photopolymerization initiator (Ciba, trade name Irgacure 907) 0.9 parts by weight Ethyl acetate 70 parts by weight

(Comparative Example 2) A hologram transfer foil of Comparative Example 2 was obtained in the same manner as in Example 1 except that the following ionizing radiation curable resin composition was used as the ionizing radiation curable resin composition of the hologram layer 15. .
・ <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 μm) 5 parts by mass Photopolymerization initiator (Ciba, trade name Irgacure 907) 0.9 parts by mass Ethyl acetate 70 parts by mass

  (Evaluation) Evaluation was performed by a transfer test to a support. In the transfer test, a credit card card made of polyvinyl chloride is used as the support 101, and a face photograph is printed on the surface of the support 101 using a color sublimable ink ribbon with a card printer HDP820 made by FARGO. After that, the surface of the adhesive layer 19 of the hard coat layer transfer foil 10 of the example and the comparative example was overlapped and thermally transferred with the card printer HDP820 manufactured by FARGO, and the transfer state to the card was observed.

(Evaluation results) In Examples 1 to 3, the peelability at the time of transfer was good, the foil breakage was good, and transfer was normally performed. However, Comparative Example 1 had poor peelability and was difficult to peel off, and burrs were generated during transfer, and transfer could not be performed normally. In Comparative Example 2, the formability of the hologram was poor, and the light diffraction effect was not obtained. The diffraction grating patterns formed on the hologram layers of Examples 1 to 3 and Comparative Example 1 exhibited a sufficient light diffraction effect, and were excellent in design and security.
Moreover, when the pencil hardness test of the 1st hard-coat layer 15 surface of Examples 1-3 was measured based on JIS-K-5400, it has hardness of 2H or more, and also of Examples 1-3. The scratch strength of the first hard coat layer 15 surface was 200 g or more of sapphire and had sufficient durability. However, in Comparative Example 1, the scratch strength was poor and the durability was not sufficient.

It is sectional drawing of the hologram transfer foil which shows one Example of this invention. It is the transferred material transferred using the hologram transfer foil of the present invention.

Explanation of symbols

10: Hard coat layer transfer foil 11: Base material 13: Release layer 15: Hologram layer 17: Reflective layer 19: Adhesive layer 21: Ultraviolet absorption layer 100: Medium 101: Support body 103: Image receiving layer 105: Image

Claims (2)

In a hologram transfer foil comprising a substrate and at least a release layer, a hologram layer, a reflective layer and an adhesive layer on one surface of the substrate,
The release layer is a melamine resin;
The hologram layer includes a cured product of ionizing radiation curable resin and reactive silicone, and polyethylene wax,
The ionizing radiation curable resin is (1) an isocyanate having three or more isocyanate groups in the molecule, (2) a polyfunctional (meta) having at least one hydroxyl group and at least two (meth) acryloyloxy groups in the molecule. ) Acrylates, or (3) a urethane (meth) acrylate oligomer that is a reaction product of polyhydric alcohols having at least two hydroxyl groups in the molecule ,
The hologram transfer foil, wherein the hologram layer also serves as a hard coat function having a pencil hardness of H or more in accordance with JIS-K5400 . 2. The hologram transfer foil according to claim 1 , wherein the content of the polyethylene wax in the hologram layer is, on a mass basis, ionizing radiation curable resin: polyethylene wax = 100: 0.01-10.

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