JP2008015071A - Forgery preventing magnetic tape transferring sheet and card - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a forgery preventing magnetic tape transferring sheet capable of preventing occurrence of sparks and preventing fire during manufacture and magnetic data damage at the time of magnetic reading or the like. <P>SOLUTION: The forgery preventing magnetic tape transferring sheet is composed of: a protection layer which can be exfoliated from the supporting body; a diffraction structure forming layer which is transparent and has minute rugged surface for producing diffracted light; a diffraction effect layer which is made of an optical thin film provided by being brought into close contact with ruggedness of the rugged surface and which reflects light passed through the diffraction structure forming layer; a magnetic recording layer which is provided by covering the diffraction effect layer; and an adhering layer which is provided by covering the magnetic recording layer, which are formed on a sheet-shaped substrate in this order from the substrate. In the forgery preventing magnetic tape transferring sheet, the diffraction effect layer is made of a metallic thin film and marine island structure where the metallic thin film partially exists is formed. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to various information display media that require anti-counterfeiting, and in particular, a forgery-preventing magnetic tape transfer sheet that is a component when manufacturing a magnetic card such as a cash card or a credit card, and the anti-counterfeit magnetic tape transfer The present invention relates to a magnetic card to which a sheet is transferred and pasted.

  In recent years, as a means to prevent counterfeiting, light interference can be used to express stereoscopic images and special decorative images. By superimposing holograms, diffraction gratings, and thin films with different optical properties, color changes (color shifts) can be achieved depending on the viewing angle. OVD [OVD is an abbreviation of “Optical (ly) Variable Device” such as a multilayer thin film. Note that DOVID is also a synonym for OVD, and is an abbreviation for “Differential Optical (ly) Variable Imaging Device”. ] Has come to be used. These OVDs require advanced manufacturing technology, have a unique visual effect, and can be judged at a glance as authenticity, so they can be formed on credit cards, securities, certificates, etc. as part of or on the entire surface as an effective counterfeit measure. Is being used. Recently, in addition to securities, it is affixed to sports equipment, computer parts and other electrical product software, etc., as an authentication sticker that proves the authenticity of the product, and as a seal sticker that is affixed to the package of those products Has also become widely used.

  On the other hand, for cash cards, credit cards, etc., there is known a magnetic card that is advantageous in card design by integrating a magnetic layer and a hologram as in Patent Document 1, and that can perform mechanical information processing. In addition, as a method for producing these cards, a method of mainly transferring and adhering a hologram-containing magnetic transfer sheet to a card substrate is known.

The prior art is as follows.
JP-A-6-167920

  However, in the processing machines at the time of manufacturing these cards, there is often a phenomenon in which static electricity charged on the card base material is sparked from the end of the diffraction effect layer made of a metal-deposited thin film to the conductive part of the processing machine, It may cause a fire and is very dangerous.

  In addition, when the product is used in a cash dispenser or the like, static electricity charged on the card surface due to friction between the card and the magnetic reading head is magnetically read from the end of the diffraction effect layer made of a metal-deposited thin film at the end of the card. The phenomenon of sparking toward the head is often seen, and it is known that the magnetic data is damaged by the spark.

  The present invention has been proposed in view of the problems of the prior art described above. The diffraction effect layer formed of a metal vapor-deposited thin film of a hologram is configured by sea-island metal vapor deposition, or an ink coating containing metal powder. By configuring, the purpose is to prevent the occurrence of sparks, and prevent damage to magnetic data such as fire in manufacturing and magnetic reading.

  Means provided by the present invention in order to solve the above-mentioned problems will be described below.

  According to the first aspect of the present invention, on the sheet-like support, at least from the side close to the support, at least a protective layer that can be peeled off from the support, and a minute uneven surface for generating diffracted light. A transparent diffractive structure forming layer, an optical thin film provided in close contact with the concavo-convex surface of the concavo-convex surface, a diffractive effect layer for reflecting light transmitted through the diffractive structure forming layer, and covering the diffractive effect layer An anti-counterfeit magnetic tape transfer sheet comprising a magnetic recording layer provided, and an adhesive layer provided so as to cover the magnetic recording layer, wherein the diffraction effect layer is a metal thin film, An anti-counterfeit magnetic tape transfer sheet characterized by forming a sea-island structure in which a metal thin film is partially present.

  The invention according to claim 2 is the anti-counterfeit magnetic tape transfer sheet according to claim 1, wherein a diffraction effect layer printed with high-brightness light reflecting ink obtained by dispersing metal powder in an organic polymer resin An anti-counterfeit magnetic tape transfer sheet is provided.

  A third aspect of the present invention provides a forgery-preventing magnetic tape transfer sheet characterized in that the average particle shape of the metal powder of the second aspect is 3 μm or less.

  The invention according to claim 4 provides a card to which the forgery-preventing magnetic tape transfer sheet according to any one of claims 1 to 3 is transferred and pasted.

  In the anti-counterfeit magnetic tape transfer sheet and card of the present invention, since the metal thin film having a diffraction effect has a sea-island structure, the metal thin film has a beautiful hologram and can perform mechanical information processing, Since the metal thin film has a sea-island structure, it is possible to prevent the occurrence of sparks due to static electricity. Therefore, it is possible to prevent damage during the manufacture of cards and damage to magnetic data during magnetic reading.

  Hereinafter, an example of a forgery-preventing magnetic tape transfer sheet of the present invention and a card having a forgery-preventing magnetic tape transfer sheet attached thereto will be described in detail with reference to the drawings. FIG. 1 shows a cross section of the forgery-preventing magnetic tape transfer sheet, and FIG. 2 shows the anti-counterfeit magnetic tape transfer sheet being transferred and pasted to a card. The anti-counterfeit magnetic tape transfer sheet (1) is a transfer sheet, and the layer structure thereof is a protective layer (3), a diffraction structure forming layer (4), a diffraction effect layer (5) on one side of the support (2). ), A magnetic recording layer (6), and an adhesive layer (7).

  As the support 2 in the forgery-preventing magnetic tape transfer sheet, a polyethylene terephthalate resin film having a stable thickness and high heat resistance is generally used, but is not limited thereto. As other materials, polyethylene naphthalate resin films, polyimide resin films and the like are known as films having high heat resistance, and can be used for the same purpose. In addition, other films such as polyethylene, polypropylene, heat-resistant vinyl chloride and the like can be used as long as coating conditions for the coating liquid, more specifically, drying conditions permit.

  As the protective layer 3 in the anti-counterfeit magnetic tape transfer sheet, a polymethyl methacrylate resin and another thermoplastic resin such as a mixture of vinyl chloride / vinyl acetate copolymer or nitrocellulose resin, or a polymethyl methacrylate resin and polyethylene are used. A mixture of wax and the like can be mentioned, and a mixture of cellulose acetate resin and thermosetting resin such as epoxy resin, phenol resin, thermosetting acrylic resin or melamine resin can be mentioned as a preferable example.

  In order to prevent the coating film from being charged, a known antistatic agent may be added.

  In the forgery-preventing magnetic tape transfer sheet, the diffractive structure forming layer 4 imparts irregularities constituting the diffraction grating on the surface thereof, and the diffractive effect layer 4 provided thereon and along the irregularities has irregularities. Is given. And the diffracted light reflected by the uneven surface of the diffraction effect layer 4 interferes with each other and has a structural color. In general, the structural color obtained by this diffraction phenomenon has different colors depending on the position of the observer.

  The diffractive structure forming layer 4 is required to have a performance capable of forming the unevenness on its surface with a press plate, and the main material is thermoplastic resin, thermosetting resin, ultraviolet ray or electron beam curing. Any of the functional resins may be used.

  Examples of materials that can be used for the diffractive structure forming layer 4 include polyisocyanates such as thermoplastic resins such as acrylic resins, epoxy resins, cellulose resins, and vinyl resins, acrylic polyols and polyester polyols having reactive hydroxyl groups, and the like. As a cross-linking agent, UV resins such as melamine resins and phenol resins, UV or electron beam curable resins such as epoxy (meth) acryl, urethane (meth) acrylate, etc. Can be used in combination. Moreover, even if it is a thing other than the above, as long as the said unevenness | corrugation can be formed, you may use it suitably.

  On the other hand, as the diffraction grating constituting the fine concavo-convex shape, a holographic technique can be used in which an interference fringe obtained by causing interference of two coherent light beams is exposed to a photosensitive material. With this holographic technique, for example, the structural color can be controlled to form a stereoscopic image with a sense of depth.

  In addition, a holographic technique is applied to each minute pixel to form a diffraction grating, and a large number of pixels having these diffraction gratings are arranged to form the entire screen, thereby expressing an image having high brightness and contrast. Is also possible. The pixel having the diffraction grating can be provided by directly drawing the diffraction grating on the photosensitive material with an electron beam, not limited to the holography technique.

  In addition, a method for forming each pixel having a diffraction grating in an appropriate shape (for example, a star shape, etc.), a method for forming fine characters (so-called micro characters) that cannot be seen with the naked eye, and a diffraction grating are used. In addition, methods have been developed to faithfully reproduce the colors of the subject as if they were photographs, or to express multiple images that differ completely depending on the viewing angle using a diffraction grating. You can also In order to prevent the coating film from being charged, a known antistatic agent may be added.

  In the forgery-preventing magnetic tape transfer sheet, the material of the diffraction effect layer 5 is a single metal material such as Al, Sn, Cr, Ni, Cu, Au, Ag, or a compound thereof. In particular, tin is suitable for forming a sea-island structure by vacuum deposition.

On the other hand, when the high reflective light reflecting ink is used for the metal reflective layer 5 and the sea island structure is formed, fine metal powder such as aluminum, silver, nickel, gold, copper, tin, indium, cobalt, or metal nanoparticles Or the like can be used in a high-brightness light reflecting ink obtained by dispersing the above in an organic polymer resin. The particle size of the metal particles is preferably 3 μm or less, more preferably 1 μm or less. In the case of particles of 1 μm or more, it becomes white turbid due to an increase in scattering components in the reflected light, and it is difficult to obtain a beautiful metallic luster.
Also, when printing high-brightness light reflecting ink, care must be taken not to attack the relief forming surface of the diffractive structure forming layer with a solvent, but gravure printing, flexographic printing, screen printing, etc. It can be formed by known printing means. When the diffraction effect layer is provided by such a printing method, the film thickness after drying may be adjusted to be about 0.1 to 10 μm.

The sea-island structure obtained by these methods refers to a shape in which individual sea-islands are independent and not connected to adjacent sea-islands. It is desirable that the distance between the islands is 100 to 5000 mm. When the distance between the islands is less than 100 mm, a tunnel current flows and the insulation is poor. When the distance between the islands is greater than 5000 mm, the total amount of metal is small and a beautiful metallic luster cannot be obtained.
In addition, since each individual island is a fine island, it is easily saturated electrically and does not stay so much that static electricity causes a spark. Moreover, even if an individual island sparks, it does not become a spark that causes a failure, and does not develop into a spark that causes a fire or damages magnetic data.
As a result, the reliability as a magnetic card is improved.

In the forgery-preventing magnetic tape transfer sheet, the magnetic recording layer 6 is formed by printing or coating using, for example, a known magnetic paint. Examples of magnetic coating materials include butyral resins, vinyl chloride / vinyl acetate copolymers, urethane resins, polyester resins, cellulose resins, acrylic resins, styrene / maleic acid copolymer resins, and other binder resins. , Rubber resin such as nitrile rubber, and urethane elastomer are added, and γ-Fe ₂ O ₃ , Co-containing Fe ₂ O ₃ , Fe ₃ O ₄ , barium ferrite, strontium ferrite, Co · Ni · Fe · In addition to Cr alone or alloy, rare earth Co magnetic substance, surfactant, silane coupling agent, plasticizer, wax, silicone oil, carbon and other pigments are added as necessary, and three rolls, sand mill, ball mill, etc. What was prepared by kneading with can be used.

  In addition to the coating type described above, the magnetic recording layer 6 may be of a metal thin film type formed by vapor deposition that has been attracting attention in recent years because it enables high-density recording, particularly oblique deposition. For example, an oblique deposition film of nickel or cobalt alone or an alloy is a specific example.

  In the anti-counterfeit magnetic tape transfer sheet, as the adhesive layer 7 in the transfer sheet, heat and in contact with various card base materials (for example, vinyl chloride, PET (polyethylene terephthalate) -G, polycarbonate, polylactic acid) A known heat-sensitive resin (heat-sensitive adhesive material) having a function of adhering to the material to be transferred is applied by applying pressure.

  Although one embodiment has been described above, it can be appropriately used depending on the purpose of use, such as coloring each layer to improve the design and printing on the surface. In view of the adhesiveness of each layer, an adhesive anchor layer can be provided between the layers.

  In the forgery-preventing magnetic tape transfer sheet, the total thickness from the protective layer 3 to the metal reflective layer 5 is 2 to 10 μm, preferably 2 to 6 μm. When the thickness is in the range of 2 to 10 μm, it can be used for a magnetic card without any trouble in mechanical information processing.

  There are various methods for forming the anti-counterfeit magnetic tape transfer sheet 1 configured as described above. For example, after the protective layer 3 is applied to one side of the support 2 by a conventionally known method, a diffraction structure is formed. The resin composition for forming the layer 4 is applied, and the diffractive structure forming portion 8 is formed by a conventionally known method. Next, after forming the diffraction effect layer 5 by a vacuum deposition method, the magnetic recording layer 6 and the adhesive layer 7 are sequentially applied to form the forgery-preventing magnetic tape transfer sheet 1.

When using the anti-counterfeit magnetic tape transfer sheet 1 configured as described above, the anti-counterfeit magnetic tape transfer sheet 1 is cut into a required size and shape as shown in FIGS. After sticking to 9 by, for example, heat fusion, the support 2 is peeled off to form the card 9 having the diffraction structure forming portion 8 and the magnetic recording layer 6 to obtain the magnetic card of the present invention. In the formed magnetic card of the present invention, the hologram forming portion 8 and the magnetic recording layer 6 are integrally formed on the card 9, so that the occupied area of the card surface can be reduced if necessary, and as a result, the decoration of the card The part which gives the sex becomes large, and the card with the large decoration is obtained. Further, since the hologram forming portion 8 is formed on the upper surface of the magnetic recording layer 6, a beautiful card 9 is obtained by hiding the colors such as black and brown of the magnetic recording layer 6.

  FIG. 4 shows another embodiment of the transfer sheet 1 in which a colored layer 10 is provided between the protective layer 3 and the diffraction structure forming layer 4. As the colored layer 10, a synthetic resin can be used, and it may be formed by applying a resin composition colored by adding a pigment to the resin, or pasting a printed film on a synthetic resin film. You may wear and form. When the transfer sheet 1 on which the colored layer 10 is formed is used for a card or the like, a card having a colorful design can be obtained. Hereinafter, the present invention will be described in more detail with reference to specific examples.

  A polyester film having a thickness of 25 μm was used as a substrate, and the following compositions (1), (2), (3), (4), (5) were used on one side of the film, and a release protective layer (thickness 1) 0.5 μ), a diffractive structure forming layer (thickness 1.5 μ), a diffraction effect layer (50 nm), a magnetic recording layer (15 μ), and an adhesive layer (3 μ) were sequentially applied to form a transfer sheet. The metal reflective layer was laminated using a vacuum deposition method instead of coating.

  The laminated transfer sheet is thermally transferred to a 0.1 mm transparent hard vinyl chloride film, and after removing the support, the milky white and the transparent hard vinyl chloride film are 0.7 to 0.8 mm thick. A plastic card containing a hologram and magnetism was prepared by laminating, forming a single plate by heating and pressing, and punching to a card size (54 mm × 86 mm) by punching. The resulting card had a beautiful appearance, an excellent machine information processing capability, and an excellent spark free from static electricity.

(1) Peelable protective layer composition acrylic resin (Tg. 105 ° C) ··· 19.2 parts by weight polyethylene powder ··· 0.8 parts by weight methyl ethyl ketone ··· 45.0 Part by weight Toluene 35.0 parts by weight (2) Diffraction structure forming layer composition urethane resin 20.0 parts by weight Methyl ethyl ketone 50.0 parts by weight ethyl acetate 30.0 parts by weight (3) Diffraction effect layer composition tin (4) Magnetic recording layer composition γ-Fe ₂ O ₃ ... 30 parts by weight vinyl acetate copolymer ... 3 parts by weight polyurethane elastomer ... 20 parts by weight toluene ... ... 15 parts by weight methyl ethyl ketone ... 15 parts by weight isopropyl alcohol 16 parts by weight (5) Adhesive layer composition Vinyl acetate vinyl acetate copolymer 20 parts by weight acrylic resin 10 parts by weight ethyl acetate・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ 20 parts by weightToluene ・ ・ ・ ・ ・ ・ ・ ・ 50 parts by weight

It is a longitudinal cross-sectional view which shows the transfer sheet used for the Example of the magnetic card | curd of this invention. It is a perspective view which shows the state which mounts a transfer sheet to a card | curd, peels a support body, and manufactures the magnetic card | curd of this invention. It is a longitudinal cross-sectional view of FIG. It is a longitudinal cross-sectional view which shows the transfer sheet used for the other Example of the magnetic card | curd of this invention. It is a conceptual diagram of the surface of the diffraction effect layer which comprises the sea island structure of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Hologram containing magnetic transfer sheet 2 Support body 3 Protective layer 4 Diffraction structure forming layer 5 Diffraction effect layer 6 Magnetic recording layer 7 Adhesive layer 8 Diffraction effect forming part 9 Card 10 Evaporation or island part 11 by high-brightness light reflecting ink

Claims (4)

  On the sheet-like support, from the side close to the support, at least a protective layer that can be peeled off from the support, a transparent diffractive structure forming layer having a minute uneven surface for generating diffracted light, A diffractive effect layer that reflects light transmitted through the diffractive structure forming layer, a magnetic recording layer that covers the diffractive effect layer, and is formed of an optical thin film provided in close contact with the concavo-convex surface of the concavo-convex surface, An anti-counterfeit magnetic tape transfer sheet comprising an adhesive layer provided so as to cover the recording layer, wherein the diffraction effect layer is a metal thin film, and the metal thin film is partially present; An anti-counterfeit magnetic tape transfer sheet characterized by forming a sea-island structure.   An anti-counterfeit magnetic tape transfer sheet according to claim 1, which has a diffraction effect layer printed with a high-brightness light reflecting ink obtained by dispersing metal powder in an organic polymer resin. .   An anti-counterfeit magnetic tape transfer sheet, wherein the average particle shape of the metal powder according to claim 2 is 3 µm or less.   A card to which the anti-counterfeit magnetic tape transfer sheet according to claim 1 is transferred and pasted.

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