JP2008155440A - Hard coat transfer foil - Google Patents

Abstract

【Task】
A hard coat transfer foil that can transfer a hard coat layer having high surface durability such as scratch resistance and solvent resistance with good transferability such as a foil crack when transferring to a medium such as a card (transfer object). I will provide a.
[Solution]
It has a layer structure of substrate 11 / release layer 13 / hard coat layer 14 / ultraviolet absorption layer 18 / adhesive layer 19, where the release layer 13 is a melamine resin, and the hard coat layer is made of an ionizing radiation curable resin and polyethylene wax. And the ultraviolet absorbing layer 18 and the adhesive layer 19 contain micro silica, the hard coat layer is ionizing radiation curable resin: polyethylene wax = 100: 0.01 to 10, and the ultraviolet absorbing layer is ionizing radiation. Cured resin: microsilica = 90-94: 6-10, the adhesive layer is polyester-based resin: microsilica = 90-94: 6-10, and the thickness of the hard coat layer may be 5-25 μm. Features.
[Selection] Figure 1

Description

  The present invention relates to a hard coat transfer foil, and more specifically, a hard coat transfer that can transfer a hologram having excellent design and / or security with good transferability, and excellent durability such as scratch resistance and solvent resistance after transfer. It is about foil.

  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) The main applications of products transferred using the hard coat transfer foil of the present invention include ID cards such as employee cards, membership cards, and student cards, gift certificates, admission cards, pass cards, service points, etc. A medium that proves the rights and qualifications (prepaid) for which a certain amount of money has been paid 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 and solvent resistance.

(Background Art) The thermal transfer method has come to be widely used as a simple printing method. In these thermal transfer methods, various images are easily formed, and therefore, the thermal transfer method is used to create a printed material that requires a relatively small number of prints, for example, an ID card such as an identification card. When a color image is preferable, such as a face photograph, a large number of colored thermal transfer layers of, for example, yellow, magenta, and cyan (and black if necessary) are repeatedly provided in sequence on a continuous base film. A thermal transfer method using a long thermal transfer film has been performed. Such thermal transfer films can be broadly classified as a so-called melt transfer type thermal transfer film in which the thermal transfer layer is softened by heating and thermally transferred to an imaged thermal transfer material, and the dye in the thermal transfer layer is sublimated by heating ( It is roughly classified into a so-called sublimation type thermal transfer film in which only the dye is thermally transferred onto the thermal transfer material in an image form by heat transfer. When creating ID cards such as identification cards with the above thermal transfer film, it is easy to form images such as letters and numbers in the case of a melt transfer type thermal transfer film, but these images are durable. In particular, there is a drawback that the friction resistance is inferior. On the other hand, in the case of a sublimation transfer type thermal transfer film, a gradation image such as a face photograph can be formed, but unlike a normal printing ink, the formed image has no vehicle, so There exists a problem that it is inferior to durability, such as a weather resistance and friction resistance. As a method for solving the above problems, many methods for transferring a protective layer (corresponding to the hard coat layer of the present invention) such as a transparent resin layer and a cured resin layer have been proposed. However, since the image exists on the outermost surface, the durability deteriorates over time due to mechanical friction, solvent, other chemicals or environmental influences over a long period of time, and in extremely harsh environments. Gas station cards and construction site cards that are used, and entrance / exit cards that do not expire or that repeatedly enter and leave a number of security-controlled rooms such as financial institutions It has increased, and sufficient durability has not yet been obtained. However, when the protective layer is thickened, the foil breakage is remarkably deteriorated.
Therefore, the hard coat layer (protective layer) transfer foil has good transparency even when used in extremely harsh environments, has no expiration date, is used for a long time, and / or is repeatedly used many times. It is demanded that the surface is protected from general friction and abrasion, is excellent in durability not easily damaged, and has a good foil breakage and can be transferred at one time. In addition, in order to increase security, it is also required to print different unique information for each sheet such as a face photograph or a number on the medium as described above.

(Prior Art) Conventionally, in order to enhance the durability such as the wearability of the surface of a face photograph image of an employee ID card, at least a release layer, a cured layer of a specific resin, an optical change element layer are provided from a support having a release layer. It is known that an intermediate layer and an adhesive layer are transferred onto a facial photograph (for example, see Patent Document 1).
The present applicant also applies a base film / transparent resin layer / polar group as a protective layer transfer film that can impart various durability such as light resistance, friction resistance, plasticizer resistance, and chemical resistance to thermal transfer images. A laminated body in which a plasticizer-resistant resin layer / a heat-adhesive resin layer composed of an acrylic copolymer resin containing a component having an antistatic property and a resin having an antistatic property is laminated in this order (for example, Patent Document 2).
Further, the present applicant has made a substrate film / transparent resin layer (releasable) / resistant as a protective layer transfer film in which various durability of the thermal transfer image, in particular, chemical resistance, light resistance and weather resistance are maintained for a long period of time. A material provided with at least one of a chemical property-imparting layer, an ultraviolet blocking layer and a security layer is disclosed (for example, see Patent Document 3).
However, any of the above has the problem that the durability of the image surface is still insufficient under severe use conditions.

JP 2001-138664 A Japanese Unexamined Patent Publication No. 07-156567 Japanese Patent Laid-Open No. 05-330259

  Accordingly, the present invention has been made to solve such problems. Its purpose is good transparency and transferability such as foil sharpness when transferring a hard coat layer with high surface durability such as scratch resistance and solvent resistance to a medium such as a card (transfer object). To provide a hard coat transfer foil that can be transferred and printed after different unique information is printed for each sheet such as a face photograph or number in order to improve security.

To solve the above problem,
The hard coat transfer foil according to the invention of claim 1 is a hard coat transfer foil comprising a substrate and at least a release layer, a hard coat layer, an ultraviolet absorbing layer and an adhesive layer on one surface of the substrate. The release layer is a melamine resin, the hard coat layer contains an ionizing radiation curable resin and polyethylene wax, and the ultraviolet absorbing layer and the adhesive layer contain microsilica.
The hard coat transfer foil according to the invention of claim 2 is such that the content of polyethylene wax in the hard coat layer is based on mass, and that the ionizing radiation curable resin: polyethylene wax = 100: 0.01-10. is there.
In the hard coat transfer foil according to the invention of claim 3, the ultraviolet absorbing layer contains at least an ionizing radiation curable resin and microsilica, and the ratio of the ionizing radiation curable resin and the microsilica is based on a mass basis. : Microsilica = 90-94: 6-10.
In the hard coat transfer foil according to the invention of claim 4, the adhesive layer contains a heat-adhesive polyester resin and microsilica, and a ratio of the heat-adhesive polyester resin and the microsilica is based on mass. Resin: microsilica = 90-94: 6-10.
The hard coat transfer foil according to the invention of claim 5 is such that the thickness of the hard coat layer is 5 to 25 μm.
An anti-counterfeit medium according to the invention of claim 6 is an intermediate transfer recording medium obtained by printing a unique information image on the adhesive layer of the hard coat transfer foil according to any one of claims 1 to 5 by a sublimation transfer method. The image on the transfer recording medium and the hard coat layer are transferred to the transfer target.

According to the present invention of claim 1, transferability such as foil cracks when transferring a hard coat layer having high surface durability such as scratch resistance and solvent resistance to a medium such as a card (transfer object). A hard coat transfer foil that can be transferred well is provided.
According to the second to fourth aspects of the present invention, in addition to the effect of the first aspect, hardware capable of better transferring transferability such as foil cracking when transferring to a medium such as a card (transfer object). A coat transfer foil is provided.
According to the fifth aspect of the present invention, in addition to the effects of the first to fourth aspects, a hard coat transfer foil having more excellent surface durability such as scratch resistance and solvent resistance after transfer is provided.
According to the present invention of claim 6, using the hard coat transfer foil of claims 1 to 5, an intrinsic information image is printed on the adhesive layer of the hard coat transfer foil by a sublimation transfer method to obtain an intermediate transfer recording medium, An anti-counterfeit medium obtained by transferring an image of the intermediate transfer recording medium and a hard coat layer to a transfer target is provided.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a cross-sectional view of a hard coat transfer foil showing one embodiment of the present invention.
FIG. 2 shows an anti-counterfeit medium transferred using the hard coat transfer foil of the present invention.

(Hard Coat Transfer Foil) As shown in FIG. 1, the hard coat transfer foil 10 of the present invention has a base material 11 and at least a release layer 13, a hard coat layer 14, and UV absorption on one surface of the base material 11. A layer 18 and an adhesive layer 19 are provided, and in the present invention of claim 1, the substrate 11 / the release layer 13 / the hard coat layer 14 / the ultraviolet absorbing layer 18 / the adhesive layer 19 is used.
As shown in FIG. 2, the anti-counterfeit medium 100 of the present invention prints a unique information image on the adhesive layer of the hard coat transfer foil 10 of the present invention by a sublimation transfer method to form an intermediate transfer recording medium. The image 103 and the hard coat layer are transferred to the transfer object 101, and have a layer configuration of hard coat layer 14 / ultraviolet absorption layer 18 / adhesive layer 19 (including image 103) / transfer object 101. .

  The release layer 13 is a melamine-based resin, and the hard coat layer 14 contains an ionizing radiation curable resin and polyethylene wax, so that the outermost surface is formed after transfer, scratch resistance (also referred to as scratch resistance), and abrasion resistance. High durability such as resistance and solvent resistance. The hard coat layer 14 includes polyethylene wax as a filler, and the ultraviolet absorbing layer 18 and the adhesive layer 19 include micro silica as a filler, so that the filler is mixed into all the layers to be transferred, etc. Therefore, it is possible to improve the foil sharpness when transferring to the medium (the transfer target 101). In addition, the polyethylene wax to be included in the hard coat layer 14 becomes the outermost surface layer after the transfer, protects the medium from solvent, mechanical friction, and abrasion, and includes unique information such as an image to be described later. Protect.

  (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, cyclic polyolefin There are cellulosic films such as cellulosic resins and cellophane. 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 during transfer, a release layer 13 is provided, and if necessary, a release layer may be provided, and both the release layer 13 and the release layer are provided. The transferability can be further improved.

  (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 hologram layer 15 or the hard coat layer 14 to be peeled, the peelability from the release layer 13 is stabilized, and the transferability at the time of transfer can be 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) The peeling layer provided as necessary includes acrylic resins, vinyl resins, polyester resins, and fiber resins with release resins such as fluorine resins, silicones, and various waxes added or copolymerized. Wax, melamine-based resin, etc., and when both the release layer 13 and the release layer are provided, they may be used in appropriate combination. In this case, the release layer has a function as a protective layer after transfer. Have.

  (Hard Coat Layer) The hard coat layer 14 includes at least an ionizing radiation curable resin as a main component and includes polyethylene wax. The ionizing radiation curable resin is preferably (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. Using an ionizing radiation curable resin containing a urethane (meth) acrylate oligomer which is a reaction product of a polyfunctional (meth) acrylate having a polyhydric alcohol having at least two hydroxyl groups in the molecule, or (3) A wax may be included, applied, dried, and cured with ionizing radiation to form an ionizing radiation curable resin.

  The ionizing radiation curable resin containing the urethane (meth) acrylate oligomer (referred to herein as the ionizing radiation curable resin composition M) is a cured ionizing radiation curable resin containing the urethane (meth) acrylate oligomer. Examples thereof include photocurable resins disclosed in Japanese Patent Application Laid-Open No. 2001-329031.

  (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 After the transfer, the hard coat layer 14 becomes the outermost surface layer, and the contained polyethylene wax protects the medium from mechanical friction and abrasion, and also protects unique information such as an image to be described later.

(1) By including polyethylene wax, the hard coat layer 14 becomes the outermost surface layer after transfer, but it can be used in extremely harsh environments, used for a long period of time, and / or repeatedly used many times. It protects the image provided on the transfer material from solvent, mechanical friction, and abrasion, and is resistant to scratches and has excellent durability.
(2) Since the hard coat layer 14 is in contact with the release layer 13 using the melamine-based resin, the hard coat layer 14 peels between the hard coat layer 14 and the release layer 13 and has a stable peelability. Generation of burrs and the like can be extremely reduced during transfer.
(3) The hard coat layer 14 includes polyethylene wax as a filler, and the ultraviolet absorbing layer 18 and the adhesive layer 19 include micro silica as a filler, so that the filler is mixed in all layers to be transferred. Therefore, it is possible to improve the foil sharpness when transferring to a medium such as a card (transfer object 101), and to improve the transferability as well as the stable releasability of (2).

  (Formation of hard coat layer) The hard coat layer 14 is formed by adding polyethylene wax to the above-mentioned ionizing radiation curable resin, and if necessary, adding a photopolymerization initiator, a plasticizer, a stabilizer, a surfactant and the like to the solvent. It may be dispersed or dissolved, applied by a known coating method such as roll coating, gravure coating, comma coating or die coating, dried, and reacted (cured) with ionizing radiation.

(Thickness of hard coat layer) The thickness of the hard coat layer 14 is usually about 1 to 5 μm, but in the present invention, it is used in an extremely severe environment, has no expiration date, or is used for a long time. In order to protect the image from solvent and mechanical friction and wear, especially scratching, and to provide durability against scratching even in repeated use many times, the hard coat layer 14 preferably has a thickness of 5 μm or more. Is 10 μm or more, more preferably 15 μm or more. Although the upper limit is not particularly limited, it is about 25 μm or less from the viewpoint of price and foil breakability. The hard coat layer 14 has a thickness of 5 μm or more, preferably 10 μm or more, and more preferably 15 μm or more, so that durability is enhanced, use in an extremely harsh environment, no expiration date, or long-term use. Even when used and / or repeatedly used many times, a hard coat transfer foil capable of protecting an image from a chemical mechanical external force can be obtained.
As will be described in the examples, the transfer layer has a total thickness of about 8 to 28 μm, which is a hard coat layer 14 / ultraviolet absorption layer 18 / adhesive layer 19, and is significantly thicker than the number of transfer layers of a normal transfer foil. Then, burrs are generated, foil transfer is poor and transfer performance such as transfer speed reduction is remarkably reduced.As in the present invention, by including a filler component in the entire layer to be transferred, releasability is good, Since the foil cutting property can be improved, the transfer can be easily performed.

  (Ultraviolet absorbing layer) The ultraviolet absorbing layer 18 may be provided between the hard coat layer 14 and the adhesive layer 19. By providing the ultraviolet absorbing layer 18, images such as facial photographs formed using sublimation transfer type ink ribbons are mainly composed of dyes with poor light resistance. Can be maintained. As the ultraviolet absorbing layer 18, if necessary, a composition containing microsilica and an ultraviolet absorber such as benzotriazoles, benzophenones, substituted oxanilides, cyanoacrylates, or triaryltriazines in a binder. Add a curing agent, photopolymerization initiator, plasticizer, stabilizer, surfactant, etc., disperse or dissolve in a solvent, apply with a known coating method such as roll coating, gravure coating, comma coating, die coating, and dry. Alternatively, drying or aging (curing) treatment after drying, or reaction (curing) with ionizing radiation may be performed. When providing the ultraviolet absorbing layer 18 on the surface of the hard coat layer 14, it is preferable to provide a primer layer 21 as shown in FIG. 2 in order to improve the adhesion between the ultraviolet absorbing layer 18 and the hard coat layer 14. . The primer layer 21 may or may not contain a filler. Even if no filler is added, the film thickness is as thin as 0.1 to 0.7 [mu] m, so that the effect on the foil breakage is small.

  The content ratio of microsilica in the ultraviolet absorbing layer 18 is ionizing radiation curable resin: microsilica = 90 to 94: 6 to 10 on a mass basis. If the content of the microsilica is less than this range, the foil sharpness at the time of transfer is poor, and if it exceeds this range, the transparency is lowered and the image becomes difficult to see.

  (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. The resin of the adhesive layer 19 is preferably one having a melting point of 60 to 95 ° C. that 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 adhesiveness to the transfer medium is insufficient, and the temperature at which the formed image is used is limited. On the other hand, when 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 burrs are easily generated.

  The preferred adhesive layer 19 contains a heat-adhesive polyester resin and microsilica, and the ratio of the heat-adhesive polyester resin and the microsilica is based on a mass-based polyester resin: microsilica = 90 to 94: 6-10. If the content of the microsilica is less than the above range, the foil sharpness is poor, and if it exceeds the above range, the transparency is lowered and the image becomes difficult to see.

  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 hard coat transfer foil 10 of the present invention thus obtained, at least the hard coat layer 14 / the ultraviolet absorbing layer 18 / the adhesive layer 19 is transferred. In addition, although it peels between the mold release layer 13 and the hard-coat layer 14 at the time of transcription | transfer, a part of mold release layers 13 may transfer to the hard-coat layer 14 slightly, but it is in the scope of the present invention.

  In FIG. 2, an image is applied to the adhesive layer 19 of the hard coat transfer foil 10 using the hard coat transfer foil 10 of the base material 11 / the release layer 13 / the hard coat layer 14 / the ultraviolet absorbing layer 18 / the adhesive layer 19. Is printed by the sublimation transfer method (first transfer) to form an intermediate transfer recording medium, and then the intermediate transfer recording medium is used to transfer the hard coat layer 14 / ultraviolet absorbing layer to the surface of the transfer object 101 including the print image. 18 is an example in which the adhesive layer 19 is transferred (second transfer). That is, since the adhesive layer 19 also serves as an image receiving layer, the unique information can be printed, and the film has good foil sharpness at the time of transfer and can be favorably adhered to the surface of the transfer target 101. Of course, the unique information can be satisfactorily adhered to the surface of the transfer target 101 without printing, and if the unique information is provided on the surface of the transfer target 101 in advance by printing or printing, the unique information can be obtained. High durability can be protected.

  (First transfer) The first transfer is performed by a known thermal printer (also referred to as a thermal transfer printer) by superimposing the ink layer of the sublimation transfer ink ribbon on the surface of the adhesive layer 19 of the hard coat transfer foil 10 and performing a desired printing operation. By doing so, the image may be sublimated (printed). The adhesive layer 19 does not adsorb foreign matter such as dust due to static electricity, and can be easily peeled and pulled out even when set and pulled out to a thermal printer, and the ink layer of the sublimation transfer ink ribbon is stacked with good adhesion, It is preferable to contain an antistatic agent so that the image is less likely to be blurred or uneven by a desired printing operation.

  (Sublimation transfer ink ribbon) As a sublimation transfer ink ribbon, a base sheet such as polyethylene terephthalate or polyethylene naphthalate, and one side of the base, Holon Brilliant Yellow S-6GL, MS Red, Kaya Another sublimation ink layer containing a sublimable dye and / or pigment such as Set Blue 14 in a binder such as a cellulose resin such as ethyl cellulose or a vinyl resin such as polyvinyl pyrrolidone is provided on the other side of the base sheet. A known heat-resistant layer having a heat-resistant protective layer formed on the surface as necessary may be used. The dye layer may be full surface, partial, or surface sequential, and the color tone is not limited to single, plural, or full color. The frame sequential ribbon is preferable in terms of on-demand printing.

  (Second transfer) The second transfer is a method for transferring to a substrate to be transferred, and may be a known transfer method, for example, hot stamping by hot stamping (foil stamping), whole surface or stripe transfer by a hot roll, thermal head A known method such as a thermal printer (also called a thermal transfer printer) using a (thermal printing head) 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.

According to the hard coat transfer foil 10 of the present invention, a hard coat layer having high durability such as sufficient scratch resistance and solvent resistance can be formed on a medium such as a card (transfer object) without providing a separate protective layer. ) Can be provided with a hard coat transfer foil that can be transferred with good transferability, such as foil sharpness, and a unique information image is printed on the adhesive layer of the hard coat transfer foil by a sublimation transfer method to perform intermediate transfer. As a recording medium, it is possible to provide a forgery prevention medium 100 in which an image and a hologram of the intermediate transfer recording medium are transferred to a transfer target.
Since the anti-counterfeit medium 100 can be protected from mechanical and chemical damage for a long period of time, a gas station card or construction site card used in an extremely harsh environment, and a long-term entry / exit card that has no expiration date. It can also be suitably used for an entrance / exit card that repeatedly enters and exits a number of security-controlled rooms such as point cards and financial institutions.

  (Transfer to be transferred) The transfer target 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 Any medium such as a dye-accepting medium may be used, and it may be appropriately selected depending on the application. Further, at least a part of the medium of the transfer target 101 may be subjected to image, coloring, printing, or other decoration. 4 illustrates an image formed on the adhesive layer 19 as an image formed by the sublimation transfer method of the sublimation transfer type, but is not limited to the presence or absence of the image.

  (Image) A particularly preferable image 103 is an image having inferior durability, for example, a long thermal transfer film in which a large number of yellow, magenta and cyan (and black if necessary) colored thermal transfer layers are repeatedly provided in the surface sequence. 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. After the image is printed on the adhesive layer 19 of the hard coat transfer foil 10 of the present invention, the image is transferred to the surface of the transfer object 101, whereby a highly durable hard coat layer 14 / ultraviolet absorbing layer 18 / adhesive layer 19, Is located on the outermost surface to protect the image and enhance durability. In particular, even in a sublimation transfer type image inferior in durability such as light resistance, weather resistance, and friction resistance, the surface is protected by the effect of the hard coat layer 14, and natural light, fluorescent light, etc. are obtained by the effect of the ultraviolet absorption layer 18. It is protected from visible light and ultraviolet rays.

  (Durability) The pencil hardness test of the hard coat layer 14 which becomes the outermost surface after transfer is measured according to JIS-K5400, and a hardness of H or higher is preferable. Further, the scratch strength of the hard coat layer 14 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. In addition, except a solvent, each composition of each layer is a mass part of solid content conversion.

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 following ionizing radiation curable resin composition was applied to the surface of the release layer 13 with a gravure reverse coater so that the coating thickness after drying was 6 μm, dried at 100 ° C., and then using a high pressure mercury lamp. The hard coat layer 14 was formed by curing by irradiating ultraviolet rays.
・ <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.
An ionizing radiation curable resin composition is prepared by blending the “ionizing radiation curable resin composition M”, a film-forming resin (acrylic oligomer), polyethylene wax, a photopolymerization initiator, and a solvent in the following composition. did.
・ <Ionizing radiation curable resin composition>
“Ionizing radiation curable resin composition M” 30 parts by mass Polyethylene wax (average particle size 5 μm) 0.6 parts by mass Photopolymerization initiator (manufactured by Ciba, trade name Irgacure 907) 0.9 parts by mass Solvent (ethyl acetate: Methyl isobutyl ketone = 1: 1) 70 parts by mass Next, the surface of the hard coat layer 14 is coated by a gravure coating with a primer layer composition pretreatment liquid having the following composition so as to have a thickness of 0.5 μm when dried. After drying, the film was aged at 45 ° C. for 24 hours to form a primer layer.
・ <Primer layer composition working solution>
Polyester resin 10 parts Vinyl chloride-vinyl acetate copolymer 10 parts Toluene 40 parts Methyl ethyl ketone 40 parts Next, the following ultraviolet absorbing layer composition is applied onto the primer layer surface so that the coating amount after drying with a gravure coater is 4 μm. Then, coating, drying at 100 ° C., and aging at 50 ° C. for 1 week, an ultraviolet absorbing layer 18 was formed.
・ <UV absorbing layer composition>
UVA-C11 (trade name of crosslinkable resin manufactured by Showa Ink Co., Ltd.) 25 parts by mass Microsilica (average particle size 0.5 μm) 2 parts by mass Solvent (MEK: toluene = 1: 1) 73 parts by mass Next, the ultraviolet rays The following adhesive layer composition was applied onto the surface of the absorbent layer 18 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.
・ <Adhesive layer composition>
Polyester resin SP170 (manufactured by Nippon Synthetic Chemical Co., Ltd., trade name) 20 parts by mass Microsilica (average particle size 0.5 μm) 1.5 parts by mass Solvent (MEK: toluene = 1: 1) 78.5 parts by mass As described above Thus, the hard coat transfer foil 10 of Example 1 having the layer structure of the substrate 11 / the release layer 13 / the hard coat layer 14 / the primer layer / the ultraviolet absorbing layer 18 / the adhesive layer 19 was obtained.

  (Example 2) As the hard coat layer 14, the same ionizing radiation curable resin composition as that of Example 1 was applied with a gravure reverse coater so that the coating thickness after drying was 6 µm, and dried at 100 ° C. The dried surface is coated with an ionizing radiation curable resin composition with a gravure reverse coater so that the coating thickness after drying is 6 μm, dried at 100 ° C., and then irradiated with ultraviolet rays using a high pressure mercury lamp. The hard coat transfer foil 10 of Example 3 was obtained in the same manner as in Example 1, except that the hard coat layer 14 having a layer thickness of 12 μm was formed by coating twice.

  (Example 3) As the hard coat layer 14, the same ionizing radiation curable resin composition as in Example 1 was applied with a gravure reverse coater so that the coating thickness after drying was 6 µm, and dried at 100 ° C. The ionizing radiation curable resin composition is applied to the dried surface with a gravure reverse coater so that the coating thickness after drying is 6 μm, dried at 100 ° C., and the dried surface is further cured with ionizing radiation. After coating the photosensitive resin composition with a gravure reverse coater so that the coating thickness after drying is 6 μm and drying at 100 ° C., it is cured by irradiating with an ultraviolet ray using a high-pressure mercury lamp and coated twice. The hard coat transfer foil 10 of Example 3 was obtained in the same manner as in Example 1 except that the hard coat layer 14 having a layer thickness of 18 μm was formed.

Comparative Example 1 A hard coat transfer foil of Comparative Example 1 was prepared in the same manner as in Example 3 except that the ionizing radiation curable resin composition described below was used as the ionizing radiation curable resin composition of the hard coat layer 14. Obtained.
・ <Ionizing radiation curable resin composition of hologram layer>
“Ionizing radiation curable resin composition M” 25 parts by mass A methacrylate oligomer (manufactured by Nippon Synthetic Chemical Co., Ltd., trade name: Purple Light 6630B) 5 parts by weight Photopolymerization initiator (manufactured by Ciba, trade name: Irgacure 907) 0.9 parts by weight Solvent (ethyl acetate: methyl isobutyl ketone = 1: 1) 70 parts by mass

  (Evaluation test) Evaluation was carried out by transferring to a transfer material and evaluating the transferability, surface hardness after transfer, scratch property, and light resistance of the printed image. First, to the adhesive layer 19 surface of the hard coat transfer foil 10 of Examples and Comparative Examples, using a sublimation type thermal transfer sheet (Dai Nippon Printing Co., Ltd., three color standard ribbons of yellow, magenta, and cyan), An image was formed by printing a face photograph and name as unique information with a 600 dpi thermal transfer printer to form an intermediate transfer recording medium. Next, a credit card specification card made of polyvinyl chloride is used as the transfer target 101, and the image of the intermediate transfer recording medium is adhered to the surface of the transfer target 101 with a card printer HDP820 manufactured by FARGO. The surface of the layer 19 was superposed, the whole surface was thermally transferred, the substrate was peeled off and gradually removed, and the anti-counterfeit medium 100 was obtained.

(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. In particular, in Example 3, the total thickness of the layer to be transferred is about 21 μm with the hard coat layer 14 / ultraviolet ray absorbing layer 18 / adhesive layer 19, which is remarkably thick as compared with the transfer layer of a normal transfer foil. The foil could be transferred without any problem because of its good foil cutting property.
However, in Comparative Example 1, the peelability was poor and difficult to peel off, the foil sharpness was poor during transfer, and burrs were generated, and transfer could not be performed normally.
Moreover, when the pencil hardness test of the hard-coat layer 14 surface of Examples 1-3 was measured based on JIS-K-5400, it has hardness of 2H or more, and also the surface of Examples 1-3. The scratch strength 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.
The light resistance is measured in accordance with JIS-B-7753 (Sunshine carbon arc lamp light resistance and weather resistance tester) using the anti-counterfeit medium 100, and the color of the image after irradiation for 500 hours. The change was evaluated by visual comparison with that before irradiation. The anti-counterfeit medium 100 using any one of the hard coat layer transfer foils 10 of Examples 1 to 3 and Comparative Example 1 was good with no significant change.

It is sectional drawing of the hard coat transfer foil which shows one Example of this invention. It is sectional drawing of the hard coat transfer foil which shows one Example of this invention. It is a forgery prevention medium transferred using the hard coat transfer foil of the present invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10: Hard coat transfer foil 11: Base material 13: Release layer 14: Hard coat layer 18: Ultraviolet absorption layer 19: Adhesive layer 21: Primer layer 100: Anti-counterfeit medium 101: Transfer object 103: Image layer

Claims (6)

In a hard coat transfer foil comprising a base material and at least a release layer, a hard coat layer, an ultraviolet absorbing layer and an adhesive layer on one surface of the base material, the release layer is a melamine resin, A hard coat transfer foil, wherein the coat layer contains an ionizing radiation curable resin and polyethylene wax, and the ultraviolet absorbing layer and the adhesive layer contain micro silica. 2. The hard coat transfer foil according to claim 1, wherein the content of the polyethylene wax in the hard coat layer is, on a mass basis, ionizing radiation curable resin: polyethylene wax = 100: 0.01-10. The ultraviolet absorbing layer contains at least an ionizing radiation curable resin and microsilica, and the ratio of the ionizing radiation curable resin to the microsilica is ionizing radiation curable resin: microsilica = 90 to 94: 6 to 10 on a mass basis. The hard coat transfer foil according to any one of claims 1 and 2. The adhesive layer contains a heat-adhesive polyester-based resin and microsilica, and the ratio of the heat-adhesive polyester-based resin and the microsilica is polyester-based resin: microsilica = 90 to 94: 6 to 10 on a mass basis. The hard coat transfer foil according to claim 1, wherein The hard coat transfer foil according to claim 1, wherein the hard coat layer has a thickness of 5 to 25 μm. An inherent information image is printed on the adhesive layer of the hard coat transfer foil according to any one of claims 1 to 5 by a sublimation transfer method to form an intermediate transfer recording medium, and the image of the intermediate transfer recording medium and the hard coat layer are covered. An anti-counterfeit medium characterized by being transferred to a transfer body.

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