JP2006096037A - Concealment card and its manufacturing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a concealment card which is of a simple construction having a sharp fluorescent pattern which can be certainly distinguished by ultraviolet irradiation from the surface of a concealing layer but is not visible by a solar light or an indoor illumination, and a method for manufacturing this concealment card. <P>SOLUTION: In this method for manufacturing the concealment card, the fluorescent pattern 7 is previously formed on the card-like base material side 2 before laminating the concealing layer 6, and when the concealing layer 6 is laminated, a fluorescent material for the fluorescent pattern 7 is diffused in a surface direction of the concealment card through the concealing layer 6, and thus the fluorescent pattern 7 can be distinguished by ultraviolet irradiation from the surface of the concealing layer 6. Since it is impossible to distinguish the pattern 7 by a natural light, this concealment card is suitably forgery-proof and is almost free from causing the fluctuation of a magnetic reproduction output. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a concealment card having a concealing layer for concealing a magnetic recording layer on a card base material, which is a card-like magnetic recording medium such as a credit card or a bank card, and a manufacturing method thereof. Furthermore, the present invention relates to a concealment card on which a fluorescent pattern that can be identified by ultraviolet irradiation on the surface of the concealment layer is printed, and a method for producing the concealment card.

  For magnetic cards that require high design, such as credit cards and bank cards, a magnetic powder originally possessed by the magnetic recording layer is provided with a concealing layer on the entire substrate including the stripe-shaped magnetic recording layer portion called a magnetic stripe. 2. Description of the Related Art Conventionally, a concealment card is known in which a concealing layer that completely conceals black and brown derived from it is formed, and a design is imparted by printing a design on the concealing layer.

On the other hand, a concealment card such as a credit card or a bank card in which security is regarded as important has been known in which a fluorescent pattern is provided together with a magnetic recording layer as a means for preventing forgery. This fluorescent pattern cannot be visually recognized by the ultraviolet rays contained in sunlight or room light, and it is necessary to be visible as a fluorescent pattern for the first time by irradiation with ultraviolet rays, thereby determining the authenticity of the card. .
As a magnetic card used for the above authenticity determination, a method is disclosed in which a fluorescent picture layer is provided between a magnetic recording layer and a concealing layer that conceals the hue of the magnetic recording layer. (Patent Document 1).
In addition, as a magnetic card having a fluorescent pattern, a constituent layer on the magnetic recording layer is formed on a transfer substrate by sequentially forming a release layer, an overcoat protective layer, a pattern printing layer, a concealing layer, and a fluorescent pattern area. A card transferred to a card on which a recording layer is formed and a manufacturing method thereof are disclosed. (Patent Document 2)
Furthermore, as a concealment card by another method that can obtain fluorescence with sufficient intensity when irradiated with ultraviolet rays, and a method for producing the concealment card, a first concealment layer, fluorescent ink printing on a magnetic recording layer on a card substrate A method of sequentially forming a layer, a second concealing layer, a process ink printing layer, and a surface protective layer is disclosed. (Patent Document 3)

However, in such a card, although the fluorescent pattern is concealed by a concealing layer so that it cannot be visually recognized by the ultraviolet rays contained in sunlight and room light (see Patent Document 1), the fluorescent pattern is clearly identified by the irradiated ultraviolet rays. At the same time, it is not always easy to adjust the thickness of the concealing layer so that it cannot be seen at all by sunlight or room light. Even if a concealing layer that conceals only the magnetic recording layer is provided as the first concealing layer and the fluorescent ink printing layer formed on the concealing layer is concealed by a dedicated second concealing layer (see Patent Document 3). ) However, although there is no possibility that the fluorescent pattern can be discriminated when irradiated with ultraviolet rays due to the thick concealing layer, it is still necessary to adjust the film thickness for visibility adjustment to prevent the fluorescent pattern from being visually recognized by sunlight or indoor ultraviolet rays. In addition, since the layer structure becomes complicated, the reproduction output of the magnetic recording layer is inevitably lowered. On the other hand, in the concealment card described in Patent Document 2, an overcoat layer, a pattern print layer, a concealment layer, and a fluorescent pattern region are formed in advance on a transfer substrate, and fluorescent ink is infiltrated into the concealment layer so that sunlight or Discriminability by ultraviolet irradiation is secured while preventing visual recognition by room light. However, there is a possibility that the sharpness of the pattern may be lost at the stage of penetration of the fluorescent ink, and it is necessary to select the combination of the composition of the fluorescent ink and the concealing layer in order to ensure appropriate penetration. The degree of freedom is limited.
Japanese Utility Model Publication No. 3-40615 JP-A-9-309287 Japanese Patent Laid-Open No. 2002-2160

  An object of the present invention is to provide a concealment card having a clear fluorescent pattern that can be reliably identified by ultraviolet irradiation from the surface of the concealment layer and cannot be visually recognized by sunlight or room light, and a simple manufacturing method thereof. .

The present invention has a concealing layer having a magnetic recording layer on at least a part of a card substrate, the concealing layer laminated to conceal the entire surface of the card substrate on the side having the magnetic recording layer, and the concealment layer A method for producing a concealment card having a fluorescent pattern that can be identified by irradiating the surface of the layer with ultraviolet light, wherein the fluorescent pattern is formed in advance on the card substrate side prior to lamination of the concealing layer, and the fluorescent agent for the fluorescent pattern A method of manufacturing a concealment card is provided, in which the fluorescent pattern is made identifiable by diffusing in the direction of the surface when the concealment card is formed.
Further, the present invention has a magnetic recording layer on at least a part of the card substrate, has a concealing layer laminated to conceal the entire surface of the card substrate on the side having the magnetic recording layer, and A concealing card having a fluorescent pattern that can be identified by irradiating the surface of the concealing layer with ultraviolet light, wherein the fluorescent agent forming the fluorescent pattern is distributed over the entire width of the concealing layer in the thickness direction at a position corresponding to the fluorescent pattern. Provide a concealment card characterized by

According to the concealment card manufacturing method of the present invention, the fluorescent pattern is preliminarily formed on the card substrate side before the concealment layer is laminated, and the fluorescent agent of the fluorescent pattern is diffused in the direction of the surface when the concealment card is formed. Therefore, the fluorescent agent is distributed over the entire width of the masking layer in the film thickness direction. For this reason, the emitted ultraviolet light causes fluorescence to be emitted at each depth portion of the masking layer, and the fluorescence emission can be identified without necessarily passing through the entire film thickness.
Therefore, it is possible to identify the fluorescent pattern even when the thickness of the masking layer is so thick that it cannot be identified if the fluorescent agent is localized in the fluorescent pattern forming region below the masking layer. There is no need to finely adjust the thickness. On the other hand, the ultraviolet component contained in sunlight and room light is weak, and the fluorescence emission intensity by this is low, and since reflection of the reflected light on the surface of a concealing layer is also high, a fluorescent picture can be suppressed below a visual recognition level. Therefore, it can be effectively used as a means for preventing forgery. Further, since the fluorescent pattern is formed in advance on the card substrate side before the masking layer is laminated, the masking layer is not affected by the solvent of the fluorescent ink when the fluorescent pattern is formed.
In addition, the fluorescent agent corresponding to the pattern is not localized in the form of a layer but is diffused and distributed in the film thickness direction on the surface of the masking layer, inside the masking layer, or between the masking layer and the magnetic layer. For this reason, due to the formation area of the fluorescent pattern, the spacing, which is the distance between the magnetic head and the magnetic recording layer at the time of recording and reproduction, is kept constant between the pattern part and the non-picture part. The Therefore, it is possible to prevent the magnetic output from changing due to the fluorescent pattern.

Hereinafter, the concealment card and the manufacturing method thereof according to the present invention will be described in detail.
In the concealment card manufacturing method of the present invention, the fluorescent pattern is formed in advance on the card base before laminating the concealing layer, and the fluorescent agent of the fluorescent pattern is the concealing layer, or the magnetic recording layer and the concealing layer. It is diffused in a direction that becomes the surface when the concealment card is formed.
FIG. 1 shows a cross-sectional view of an embodiment of a concealment card according to the present invention. The concealment card is formed by integrating the oversheets 1 and 4 with various functional layers applied and transferred to both ends of the center cores 2 and 3 by thermocompression bonding. The magnetic recording layer 5 is transferred to the front side oversheet, and the concealing layer 6 covers the entire surface of the magnetic recording layer 5 and the oversheet. A fluorescent agent region 9 is distributed in the film thickness direction of the masking layer 6 or the masking layer and the magnetic recording layer, and a fluorescent agent diffusion preventing layer 8 may be provided on the masking layer 6. The layer may also serve as a protective layer. Note that a normal pattern 7 can be formed by printing on the concealing layer on a portion other than the top of the magnetic recording layer or on the back surface of the center core.

In the method for producing a concealing card of the present invention, the fluorescent pattern is formed in advance on the card substrate side before the concealing layer is laminated, and the fluorescent agent of the fluorescent pattern passes through the concealing layer and the surface direction of the concealing card. However, there are several options in terms of the position and method of forming the fluorescent pattern, the method of diffusing the fluorescent agent, and the method of forming the concealing layer, the fluorescent agent diffusion preventing layer, and the like.
FIG. 2 shows a process chart for forming a fluorescent pattern from the transfer base material to the concealment card base material before forming the concealment layer when the oversheet and the center core are integrated by hot-pressing. Yes. The process diagram shows three types of fluorescent pattern formation processes, (CI), (CII), and (CIII), but these are the only options from the three, and the pattern by any one process If formation is selected, there is no need to perform the other two pattern formation steps.
Further, the transfer material heating step (aging step) (CI) -2 surrounded by a dotted line is not necessarily essential when the pattern forming step (CI) is performed.

In the concealment card manufacturing method of the present invention, when the fluorescent pattern is provided only on the magnetic recording layer portion, the magnetic recording layer 11 is formed using the transfer laminate 14 (FIG. 3) for forming the magnetic recording layer 11 on the oversheet. At the same time, it can be formed on the oversheet 4. The positions where the fluorescent pattern forming area is formed in the transfer laminate are between the transfer substrate 10 and the magnetic recording layer 11 of the transfer laminate 14 and between the magnetic recording layer 11 and the heat-sensitive adhesive layer 12. The surface of the heat-sensitive adhesive layer 12 and the like are possible, but at least for the purpose of being able to quickly manufacture a laminate for transfer from the determination of the fluorescent pattern and to be able to respond quickly to changes in the fluorescent pattern, the formation of the fluorescent pattern is for transfer It is preferable to be close to the final step of producing the laminate, and the fluorescent pattern forming region is preferably formed on the heat-sensitive adhesive layer. FIG. 2 (CII) also shows a case where the fluorescent pattern forming region is formed on the heat-sensitive adhesive layer.
When the fluorescent pattern forming portion formed at these positions is transferred onto the oversheet together with the magnetic recording layer by the transfer process, and integrated with a hot press with the oversheet on the opposite side of the center core or the center core, The fluorescent agent in the fluorescent pattern forming portion formed on the transfer laminate is diffused toward the surface of the transfer material. The fluorescent material of the transfer material can be diffused in advance to the transfer substrate side, which is the surface direction after transfer through the transfer material when the transfer laminate is aged before the hot-pressing, Thus, it is also possible to use aging (CI) -2 and hot press E together for the transfer laminate.

  In the concealment card formed by the fluorescent pattern forming method of the present invention, the fluorescent agent is not localized in the fluorescent pattern forming area, but is distributed in the film thickness direction of the corresponding position by diffusion. However, in order to reduce the fluctuation of the magnetic reproduction output due to the formation of the fluorescent pattern, the fluorescent pattern is formed above the magnetic recording layer in the transfer laminate and transferred between the magnetic recording layer and the oversheet by transfer. It is preferable that the fluorescent agent diffuses in the film thickness direction at the corresponding position of the magnetic recording layer by hot pressing. By forming the fluorescent pattern below the magnetic recording layer in this way, the fluorescent agent can be diffused and penetrated into the magnetic recording layer and the concealing layer so as to be distributed over the entire width of each layer. It is possible to prevent the fluorescent agent from being localized only in a specific portion. For this reason, there is no influence on the magnetic reproduction output.

On the base material for the concealment card thus formed, a concealment layer and, if necessary, a fluorescent agent diffusion prevention layer are formed in the coating step (FI) (FIG. 4) or the transfer step (FII) (FIG. 5). To do. These new layers provided on the base material are in close contact with the base material for the concealment card by being hot-pressed (G), and at this time, the fluorescent agent further diffuses through the concealment layer toward the surface. .
In FIGS. 2, 4, and 5, the concealing layer and the fluorescent agent diffusion preventing layer are formed by integrating the concealment card base material by the hot press (E), and then the hot press (G) on the surface again. The concealing layer and these fluorescent agent diffusion prevention layers are transferred onto the oversheet base material onto which the magnetic recording layer has been transferred in advance, and hot pressure is applied together with the center core and the oversheet on the opposite side. You may press and integrate.

As another method for forming the fluorescent pattern on the magnetic recording layer portion, the magnetic recording layer may be formed on the oversheet side of the position where the magnetic recording layer is formed in the transfer step before transferring the magnetic recording layer (FIGS. 3 and 2). (CII)). The magnetic recording layer 11 is transferred onto the pattern forming area formed in this way via the heat-sensitive adhesive layer 12, and the fluorescent agent in the fluorescent pattern forming area is subjected to hot press pressing integrated with the center core or the like. It diffuses through the heat-sensitive adhesive layer 12 and the magnetic recording layer 11 toward the concealed card surface. Thereafter, a concealing layer 6 and a fluorescent agent diffusion preventing layer 8 are further formed thereon, and further hot pressing is performed, and the fluorescent agent further diffuses through the concealing layer toward the surface of the concealing card.
The hot press at this time is to form a base for a concealment card without a concealing layer and a diffusion preventing layer by the hot press (E) and further laminate the concealment layer and the like by the hot press (G). However, the concealing layer and, if necessary, the fluorescent agent diffusion prevention layer formed on the concealing layer are previously transferred onto the oversheet on which the magnetic recording layer etc. are formed, and the center core, other It may be integrated with the oversheet at a time by hot pressing.

When the fluorescent pattern is previously formed on the oversheet substrate, the fluorescent pattern may be formed on the entire surface of the substrate. In this way, in the subsequent process, part of the fluorescent agent etc. diffuses through the magnetic recording layer and the concealing layer in the surface direction after the concealment card is formed, and the other part passes through the concealment layer during concealment card formation. It diffuses in the surface direction. In this way, a fluorescent pattern that can be identified over the entire surface of the card is formed.
When forming the fluorescent pattern formation area on the entire surface of the oversheet substrate, a part of the substrate for the concealment card formed by pasting the oversheet on which the magnetic recording layer has already been formed and the center core are pasted together is used. You may form on a base material so that one part may cover on a magnetic-recording layer (FIG. 2 (cIII)). The fluorescent agent in the pattern forming portion diffuses toward the surface of the concealment card through the concealment layer by the hot press for forming the concealment layer or the fluorescent agent diffusion preventing layer as described above.
In order to form a uniform fluorescent pattern on the entire surface of the card, it is preferable that the magnetic recording layer is formed on the oversheet, and the pattern is formed at a time after forming the concealed card base material because the diffusion distance is equal. However, when priority is given to reducing fluctuations in the magnetic reproduction output, or in order to more completely prevent the fluorescent pattern from being visually recognized by sunlight or room light, the fluorescent pattern is previously placed on the oversheet before transfer of the magnetic recording layer. It is preferable to form the film because the fluorescent agent or the like is not localized on the magnetic recording layer.

Hereinafter, in the concealment card manufacturing method of the present invention, each layer constituting the concealment card will be described in further detail.
The base material for cards used for oversheets and center core sheets must have mechanical properties, water resistance, chemical resistance, etc. that can withstand the intended use. Polyethylene terephthalate (PET), polyvinyl chloride (PVC), polycarbonate A synthetic resin sheet such as (PC) or amorphous copolyester (PET-G) is used. The thickness of the oversheet is about 50 to 100 μm, the center core sheet is 540 to 640 μm when one sheet is used, and 270 to 320 μm when two sheets are used.

In the method for producing a concealment card of the present invention, the magnetic recording layer covering at least a part of the substrate can be formed by a transfer process or a coating process. When forming by the coating process, a magnetic coating containing the following magnetic powder and binder resin is applied on the substrate. When forming by the transfer process, the following magnetic recording layer transfer tape is used.
The magnetic recording layer transfer tape is formed by laminating a magnetic recording layer and a heat-sensitive adhesive layer on a transfer substrate, and a fluorescent pattern forming region can be formed on the heat-sensitive adhesive layer.

  As the transfer substrate film used for the transfer tape for magnetic recording layer used when the magnetic recording layer is formed by a transfer process, any known and commonly used film can be used. Examples thereof include polyesters such as polyethylene terephthalate, polyolefins such as polypropylene, cellulose derivatives such as cellulose triacetate, and plastics such as polyamide. Of these, polyethylene terephthalate having both tensile strength and heat resistance is preferred. Moreover, there is no restriction | limiting in particular in the thickness of a transcription | transfer base film, Usually, 3-100 micrometers, Preferably it is 5-50 micrometers.

The magnetic recording layer on the transfer substrate can be formed, for example, by applying and drying a magnetic paint containing a magnetic powder, a binder resin, and a solvent for dissolving the binder resin on the transfer substrate.
As the magnetic powder, known magnetic powders such as γ-iron oxide, magnetite, cobalt-coated iron oxide, chromium dioxide, iron-based metal magnetic powder, barium ferrite, strontium ferrite and the like can be used, and the coercive force is 20 to 20 The thing of the range of 320 kA / m is preferable.
As the binder resin used for the magnetic recording layer, known and commonly used binder resins can be used. For example, chlorination of cellulosic resins, butyral resins, acrylic resins, polyurethane resins, polyester resins, copolymers of vinyl chloride and vinyl acetate, or copolymers added with vinyl alcohol, maleic anhydride or acrylic acid, etc. Mention may be made of vinyl resins, epoxy resins, phenolic resins, melamine resins and mixtures of these resins. It can also be thermally cured using an isocyanate compound.
The fluorescent agent in the fluorescent pattern forming region can be diffused through the magnetic recording layer to the transfer material surface. Although the diffusion speed and the degree of difficulty vary depending on the type of resin, the temperature applied to the transfer material and the resin used for the magnetic recording layer can be appropriately selected and adjusted. In order to facilitate the diffusion of the colorant, the Tg of the binder resin used for the magnetic recording layer is preferably lower than the temperature applied to the transfer material.

Examples of the solvent used for the magnetic recording layer paint include ketones such as acetone, methyl ethyl ketone, and cyclohexanone, esters such as methyl acetate, ethyl acetate, and butyl acetate, alcohols such as ethanol, hexane, toluene, and xylene. A hydrocarbon can be mentioned, These solvents can also be used in mixture of 2 or more types.
If necessary, auxiliary agents such as surfactants, silane coupling agents, plasticizers, waxes, silicone oils, carbon black and other fillers may be added to the magnetic recording layer coating material.

The magnetic recording layer coating material can be obtained, for example, by kneading and dispersing the magnetic powder, the binder resin, and the solvent by a known and usual method. As the kneading and dispersing machine, for example, a two-roll mill, a three-roll mill, a ball mill, a Henschel mixer, a cobol mill, a sand mill, a disper, a homogenizer, a kneader, or the like can be used.
The coating method for the magnetic recording layer coating is not particularly limited, and a known and commonly used coating method may be used. After applying a predetermined amount of the magnetic coating, the easy magnetization direction of the magnetic powder is in the longitudinal direction of the magnetic recording layer coating. Then, the alignment treatment is performed and drying is performed. As a coating method, for example, a gravure method, a reverse method, a transfer roll coater method, a kiss coater method, a die coater method, etc. can be used, and in the magnetic recording layer coating film before drying formed on the transfer substrate by these coating methods. After the orientation treatment of the magnetic powder, the magnetic recording layer can be formed by drying the coating film.
The magnetic field orientation treatment is preferably performed after application by the above application method and before the coating film is dried, from the viewpoint of recording / reproduction characteristics. As the magnetic field orientation method, a known method such as a repulsive counter permanent magnet, a solenoid electromagnet, or the like can be used. The magnetic field strength is preferably in the range of 1000 to 6000G.
The dry film thickness of the magnetic recording layer is preferably in the range of 2 to 50 μm, more preferably in the range of 5 to 20 μm.

  Further, if necessary, a release layer may be provided between the transfer base film and the magnetic recording layer to facilitate the peeling of the magnetic recording layer from the transfer base film during transfer. You may form the intermediate | middle layer shown in 2002-293067.

A heat-sensitive adhesive layer can be used in the pattern forming method and the transfer laminate of the present invention. The heat-sensitive adhesive layer generally contains a resin exhibiting heat-sensitive adhesiveness.
Examples of the resin exhibiting heat-sensitive adhesion include vinyl chloride resins such as copolymers of vinyl chloride and vinyl acetate, or copolymers added with vinyl alcohol, maleic anhydride or acrylic acid, and polyester resins. , Acrylic resin, polyimide resin, polyurethane resin and the like.
The fluorescent agent in the fluorescent pattern forming region can be diffused through the heat-sensitive adhesive layer toward the surface of the transfer material. The speed and difficulty of diffusion vary depending on the type of resin used in the heat-sensitive adhesive layer, but can be adjusted by appropriately selecting the temperature applied to the transfer material and the resin used in the magnetic recording layer. In order to facilitate the diffusion of the fluorescent agent, it is preferable that the Tg of the binder resin used for the heat-sensitive adhesive layer is lower than the temperature applied to the transfer material.
As the solvent used for the heat-sensitive adhesive layer, for example, the solvents described in the magnetic recording layer can be used. Dissolve heat-sensitive adhesive resin in a solvent, mix and stir to adjust the adhesive paint, apply this adhesive paint on the magnetic recording layer by a known method such as reverse method, gravure method, die coating method, and dry It is obtained by doing.
The thickness of the adhesive layer is preferably 0.5 to 15 μm, particularly preferably 0.5 to 5 μm.

  The formation of the fluorescent pattern forming region in the fluorescent pattern forming method of the present invention can be performed by printing the following fluorescent pattern forming ink.

  When forming a fluorescent pattern identified by ultraviolet irradiation, a fluorescent printing ink can be used. The fluorescent pattern printing ink contains a binder resin, a fluorescent agent, and a solvent. An organic fluorescent material can be used as the fluorescent agent of the fluorescent printing ink. Specific examples of the organic fluorescent substance include fluorescent dyes such as benzoxazole thiophine, diaminostilbene, imidazole, coumarin, naphthalimide, and rare earth complexes. Commercially available fluorescent substances include trade name UVITEX OB manufactured by Chiba Special Chemicals, trade name Kaylight OS manufactured by Nippon Kayaku Co., Ltd., trade name Thermoplast series, trade name Fluorol series, trade name Lumogen, manufactured by BASF. Series, Rumi Color, trade name by Recording Materials Research Laboratory, etc. can be used.

As the binder resin used for the fluorescent pattern printing ink, a known and commonly used binder resin can be used. For example, the resin used in the magnetic recording layer and the heat-sensitive adhesive layer can be mentioned, but when the fluorescent pattern is formed on the heat-sensitive adhesive layer of the transfer laminate for forming the magnetic recording layer, the thermal pattern to which the fluorescent pattern printing is applied. Adhesives and binder resins that have good adhesion to the card oversheet substrate and do not hinder the adhesion when transferring the transfer material on the transfer laminate to the card oversheet substrate are preferred. The binder resin for the heat-sensitive adhesive can be preferably used.
As the solvent used in the fluorescent pattern printing ink, known and commonly used solvents can be used. For example, the solvents already mentioned in the description of the colorant, magnetic recording layer, and heat-sensitive adhesive layer can be used.

For fluorescent pattern printing ink, fluorescent agent is used in binder resin and solvent that dissolves binder resin alone or in combination of two or more types, such as two-roll mill, three-roll mill, ball mill, sand mill, and disper. A fluorescent pattern printing ink is prepared by dispersing by a known and conventional method.
For the printing of fluorescent patterns, known printing methods such as gravure printing, flexographic printing, offset printing, screen printing, and ink jet can be used, but gravure printing is particularly suitable from the viewpoint of printing quality and productivity. .
The film thickness of the fluorescent pattern printing area is not particularly limited. However, when the film thickness is too thick when formed in the transfer laminate, the transfer laminate for forming the magnetic recording layer is generally rolled up in a reel shape. Therefore, if the level difference due to the film thickness difference between the non-printing area and the printing area is large, the transfer material on the transfer laminate may be deformed and the adhesion between the transfer material and the card substrate may be deteriorated. The film thickness is preferably from 0.5 to 5 μm, particularly preferably from 0.5 to 2.0 μm.

Thus, using the fluorescent pattern printing ink, for example, the heat-sensitive adhesive surface of the transfer laminate for forming the magnetic recording layer, the portion to which the magnetic recording layer of the card oversheet base is transferred, or after the magnetic recording layer is formed A fluorescent pattern is formed on the card substrate or the magnetic recording layer.
When forming a fluorescent picture, the picture can also be formed with ink mixed with a fluorescent agent and a coloring pigment. In this way, the presence or absence of a fluorescent pattern can be confirmed visually without using an ultraviolet irradiation device, and thus is extremely useful in the manufacturing process. Further, in such a pattern, the difference in diffusion rate between the fluorescent agent and the color pigment is extremely large, and therefore it is possible to make only the fluorescent pattern manifest by diffusing only the fluorescent agent.

  In order to diffuse the fluorescent material with the fluorescent pattern formed before forming the base material for the concealment card in the surface direction through the transfer material composed of the magnetic recording layer, the heat-sensitive adhesive layer, etc., the transfer material is placed over the card base material. After being transferred to the sheet, the sheet is sandwiched between the oversheet opposite to the center core and a mirror plate for pressing, and subjected to hot pressing for several tens of minutes to several hours at a temperature of 100 to 160 ° C. Diffuse to the material surface side. Furthermore, as a method of diffusing the pattern formed in the transfer laminate into the transfer material, the transfer laminate is allowed to stand in a high temperature environment of 40 to 80 ° C. for several hours to several days before the transfer process. It is also possible to diffuse the fluorescent agent in advance to the transfer substrate side, which is the surface side of the transfer material after transfer.

  FIG. 4 shows a flowchart of a first concealment card manufacturing method using the concealment card substrate. A concealing layer, a picture region formed as necessary, or a fluorescent agent diffusion preventing layer is sequentially applied and formed on the aforementioned concealing card substrate. Thereafter, a fluorescent pattern that can be discriminated by ultraviolet irradiation is formed by diffusing the fluorescent agent of the fluorescent pattern in the surface direction during the formation of the concealment card by performing hot-pressing, and is punched into a card shape. A hidden card is obtained.

The masking layer of the present invention contains a binder resin, a colorant, and a pigment as components.
Pigments used for the colorant include alumina, titanium oxide, chromium oxide, iron oxide, zinc oxide, barium sulfate, etc. as inorganic pigments, and azo-based, phthalocyanine-based, quinacridone-based, perylene-based, anthraquinone-based organic pigments, There are many types such as thioindigo and indanthrene, but there is no particular limitation. Moreover, it can replace with the said pigment, or can also use together dyes, such as a phthalocyanine dye, an azo dye, a nitro dye, a quinoline dye, a methine dye, an azine dye, a fatalein dye.

As a pigment that can effectively conceal the color of the magnetic layer, scaly metal powder can also be used, and as the metal, aluminum, gold, silver, copper, brass, titanium, chromium, nickel, nickel chromium, stainless steel, etc. are used. be able to. The flake metal powder is adjusted to a plate shape by a ball mill or the like, and the size in the plane direction of these shapes is preferably 5 to 25 μm, more preferably 10 to 15 μm. The thickness is about 0.1 to 1 μm.
As the binder resin used for the coating material for the concealing layer, known and commonly used binder resins can be used. For example, in addition to the binder resin described for the magnetic recording layer, polyimide resin, polyamide resin, rosin-modified maleic acid resin, polystyrene resin, shellac, alkyd resin, and the like can be given. It can also be thermally cured using an isocyanate compound.
Although the diffusion rate and difficulty of the fluorescent agent vary depending on the type of resin, the temperature applied during hot pressing and the resin used for the concealing layer can be appropriately selected and adjusted. In order to facilitate the diffusion of the colorant, it is preferable that the Tg of the binder resin used for the concealing layer is lower than the temperature applied during hot press.

As the solvent used for the coating material for the concealing layer, known and commonly used solvents can be used. For example, the solvents already described for the magnetic recording layer can be used.
A colorant and a pigment are mixed in a binder resin and a solvent that dissolves the binder resin, or two or more kinds are mixed and dispersed by a known and usual method such as a two-roll mill, a three-roll mill, a ball mill, a sand mill, or a disper. Then, a colored layer coating material is prepared, and this is applied and dried by a known method such as a reverse method, a gravure coating method, a die coating method, etc. to obtain a concealing layer.
In addition, the concealing layer effectively conceals the hue of the magnetic recording layer by applying the scaly metal powder to the base for a concealing card and then applying a paint containing a colorant. A concealment card having a hue other than the original hue of the metal powder can be created, and a plurality of layers can be applied in this way.

The film thickness of the concealing layer is preferably thick to conceal the brown or black color of the magnetic recording layer. However, when the card is formed, it is positioned on the surface layer side of the card relative to the magnetic recording layer. Therefore, if the film thickness of the concealing layer is too large, the spacing increases, the reproduction output characteristics deteriorate, and the information reading The possibility of error occurrence increases. Further, in the fluorescent pattern forming method of the present invention, the fluorescent agent in the fluorescent pattern forming area is diffused in the direction of the surface of the transfer material to form a distinguishable fluorescent pattern. An area that can be held is required. If the thickness of the region is too thin, the fluorescent pattern is not sufficiently formed, and the fluorescent agent is diffused in the lateral direction and the pattern tends to be unclear. On the other hand, if the thickness of the region is too thick, the diffusion region may be too wide and the fluorescent pattern may become unclear.
Therefore, the thickness of the concealing layer needs to be sufficient to conceal the hue of the magnetic recording layer according to the material of the concealing layer, but is preferably more than 2 μm from the viewpoint of the diffusion region, and is 3 μm or more. More preferably it is. The upper limit of the film thickness is preferably 15 μm or less and more preferably 10 μm or less so as not to reduce the reproduction output of the magnetic recording layer excessively.
The thickness of the diffusion region that can be located on the fluorescent pattern forming region, such as a concealing layer, a heat-sensitive adhesive layer, and a magnetic recording layer, is preferably 50 μm or less and more preferably 20 μm or less so that the pattern does not become unclear.
Further, the fluorescent agent diffusion layer formed only for diffusing and holding the fluorescent agent to make the fluorescent pattern clearer is formed above the fluorescent pattern forming region, for example, further above the concealing layer, with the fluorescent agent diffusion preventing layer. It can also be formed in between.

The fluorescent agent diffusion prevention layer has a property to prevent the fluorescent agent of the pattern diffused through heat through the heat-sensitive adhesive layer, magnetic recording layer, concealment layer, etc. from further diffusing outside the fluorescent agent diffusion prevention layer. Further, in the card manufacturing process, the fluorescent agent in the fluorescent pattern forming region is prevented from adhering to the hot press metal plate. Moreover, these fluorescent agent diffusion prevention layers fulfill | perform the function as a protective layer of the laminated body under a fluorescent agent diffusion prevention layer. In addition, it is preferable that these fluorescent agent diffusion prevention layers are substantially transparent so that the pattern of the fluorescent agent which has diffused to just below can be easily identified.
In addition, it is more preferable that the ultraviolet ray is well transmitted.
As the binder resin constituting the fluorescent agent diffusion preventing layer, the binder resin, for example, cellulose resin, butyral resin, acrylic resin, polyurethane resin, polyester resin, copolymer of vinyl chloride and vinyl acetate, or further Mention may be made of vinyl chloride resins such as copolymers added with vinyl alcohol, maleic anhydride or acrylic acid, epoxy resins, phenol resins, melamine resins, and mixtures of these resins.
In order to effectively prevent the fluorescent agent, it is preferable to use a resin having a Tg higher than the hot press temperature when the fluorescent agent diffuses.
The fluorescent agent diffusion prevention layer is formed by applying and drying a fluorescent agent diffusion prevention layer coating containing the above resin.

Solvents used in the coating for the fluorescent agent diffusion prevention layer include, for example, ketones such as acetone, methyl ethyl ketone and cyclohexanone, esters such as methyl acetate, ethyl acetate and butyl acetate, alcohols such as ethanol, hexane, toluene, xylene and the like. These hydrocarbons can be mentioned, and these solvents can be used as a mixture of two or more.
Further, soybean fluorescent lecithin, microsilica, wax or the like can be added to the fluorescent agent diffusion preventing layer as a film modifier as required. Moreover, it is preferable to add a curing agent such as a polyisocyanate compound to crosslink between the resin binder molecules in order to improve the durability of the fluorescent agent diffusion preventing layer.
The fluorescent agent diffusion preventing layer can be obtained by applying the fluorescent agent diffusion preventing layer coating prepared as described above onto a temporary support film by a known and common method such as a reverse method, a gravure method, a die coating method or the like.
The dry coating thickness of these fluorescent agent diffusion preventing layers is preferably as thin as possible from the viewpoint of recording / reproduction characteristics, but is preferably 0.1 to 5 μm, more preferably 0.3 to 2 μm in view of balance with strength, durability, and the like. preferable.
Moreover, a pattern can also be formed by the normal printing method using the coloring ink normally used as needed between a hiding layer and these fluorescent agent diffusion prevention layers.

Thus, after providing the concealing layer and the fluorescent agent diffusion preventing layer on the concealing card substrate, for example, the temperature is 100 to 130 ° C., the pressure is 10 to 20 kg / cm ² , and the time is 5 to 30 minutes. By doing so, the fluorescent agent diffuses in the surface of the concealment layer, and the card surface is also smoothed, and at the same time, the durability of the concealment card is improved. The concealment card substrate thus laminated with the concealment layer is then punched into a card shape to obtain the concealment card of the present invention.

  Next, the flowchart of the 2nd concealment card manufacturing method is shown in FIG. The second method is to form a concealing layer and a fluorescent agent diffusion preventing layer by a transfer process, and on the transfer substrate, the fluorescent agent diffusion preventing layer 8, the concealing layer 6, and if necessary, a heat sensitive adhesive layer. Is applied to form a transfer laminate, on which the magnetic recording layer and the fluorescent pattern forming area are already formed, on the magnetic recording layer side of the concealed card substrate, on the heat-sensitive adhesive layer side of the transfer laminate The transfer material is transferred onto the concealment card substrate by hot-pressing and the fluorescent agent in the fluorescent pattern forming region is changed depending on the position where the fluorescent pattern forming region was originally formed. Alternatively, by diffusing through the magnetic recording layer in the direction of the surface when the concealment card is formed, a fluorescent pattern that is visible by ultraviolet irradiation is formed. The concealment card substrate on which the concealment layer is formed is then punched into a card shape to obtain a concealment card.

As the transfer base material used for the transfer sheet for the concealment card for laminating the concealment layer and the like in the transfer step, the same material as the transfer base material used for the transfer tape for the magnetic recording layer can be used. The thickness of the transfer substrate is not particularly limited, but is usually 3 to 300 μm, preferably 50 to 200 μm.
The fluorescent agent diffusion prevention layer used in the concealment card manufacturing method using the transfer sheet of the present invention basically requires the same function as the fluorescent agent diffusion prevention layer shown in the explanation of the first concealment card manufacturing method. Therefore, the same paint can be used, but in this manufacturing method, releasability from the transfer substrate is required, so if the fluorescent agent diffusion prevention layer does not have releasability, silicone resin or the like on the transfer substrate film After applying the release layer, a fluorescent agent diffusion preventing layer is formed by coating. The fluorescent agent diffusion prevention layer coating method is also the same, and can be obtained by coating the fluorescent agent diffusion prevention layer coating material on the transfer substrate film by a known and common method such as a reverse method, a gravure method, or a die coating method. The dry coating thickness of the fluorescent agent diffusion preventing layer is preferably as thin as possible in terms of recording / reproduction characteristics, but is preferably 0.1 to 5 μm, more preferably 0.3 to 2 μm in consideration of balance with strength, durability, and the like. .

For the masking layer, the masking layer coating material and coating method shown in the description of the first masking card manufacturing method can be used in the same manner, and the film thickness of the masking layer is also 2 to 15 μm, particularly 3 to 10 μm. preferable. Moreover, a pattern can also be formed by the normal printing method using the coloring ink normally used as needed between a fluorescent agent diffusion prevention layer and a concealing layer.
The heat-sensitive adhesive is required to have a function of adhering the concealment card substrate and the concealment card transfer sheet by hot pressing, and the heat-sensitive adhesive coating material and the coating method described in the step of transferring and forming the magnetic recording layer are the same. The film thickness of the heat-sensitive adhesive layer can be used in the same way, since the heat-sensitive adhesive layer of the transfer sheet is positioned on the surface layer side of the card rather than the magnetic recording layer in the concealed card, and the output characteristics are affected. Needs to be as thin as possible within the range satisfying the adhesiveness, preferably 0.5 to 5 μm, particularly preferably 0.5 to 2 μm.

The present invention will be described in more detail below using examples and comparative examples, but the present invention is not limited to the examples, and hereinafter, “parts” represents parts by mass.
In the examples and comparative examples, the transfer tape for magnetic recording layer and each coating material shown below are used.

<1. Preparation of transfer tape for magnetic recording layer>
In order to form an intermediate layer, a magnetic recording layer, and a thermosensitive adhesive layer on a polyethylene terephthalate film having a thickness of 24 μm on the transfer substrate film, the following coating materials were prepared. Hereinafter, “part” represents “part by mass”.

(Interlayer paint)
100 parts of iron oxide (“DNS-235” manufactured by Toda Kogyo Co., Ltd.)
11.0 parts of vinyl chloride copolymer (“Solvine TA2” manufactured by Nissin Chemical)
Cellulosic resin 11.0 parts (manufactured by Eastman Chemical Co., “CAP-482-0.5”)
8.8 parts of polyisocyanate (“Hardener No. 50” manufactured by Dainippon Ink & Chemicals, Inc. (active ingredient: 50%))
Sorbitan monostearate 5 parts (“SP-S10” manufactured by Kao)
MEK 400 parts Toluene 400 parts Cyclohexanone 200 parts The above materials were dispersed and mixed in a ball mill to prepare a coating for an intermediate layer.

(Paint for magnetic recording layer)
Hexagonal ferrite magnetic particles 100 parts {"MC-906" coercive force 51.7 (kA / m) manufactured by Toda Kogyo Co., Ltd.}
10 parts of vinyl chloride resin (Zeon Corporation “MR-110”)
5 parts of polyurethane resin ("T-5206" manufactured by Dainippon Ink & Chemicals, Inc.)
Sorbitan monostearate 5 parts (“SP-S10” manufactured by Kao)
6 parts of polyisocyanate (“Hardener No. 50” manufactured by Dainippon Ink & Chemicals, Inc. (active ingredient: 50%))
MEK 50 parts Toluene 50 parts Cyclohexanone 15 parts Using the above materials, a coating material for a magnetic recording layer was prepared by the method described in JP-A 09-059541.

(Coating for heat-sensitive adhesive layer)
1 part of polyurethane resin (“TS-03” manufactured by Dainippon Ink & Chemicals, Inc.)
4 parts of vinyl chloride-vinyl acetate copolymer resin (“Solvine C5” manufactured by Nissin Chemical)
MEK 45 parts Toluene 50 parts

The above materials were stirred and thoroughly dissolved with a disper to homogenize to prepare a heat-sensitive adhesive paint.
A polyethylene terephthalate film having a thickness of 24 μm was used as a transfer support film, and an intermediate layer coating was applied on one side of the film to form an intermediate layer having a dry film thickness of 0.5 μm. A magnetic recording layer coating was applied on the intermediate layer to form a magnetic recording layer having a dry film thickness of 12 μm. Further, a heat-sensitive adhesive layer coating was applied on the magnetic recording layer to form a heat-sensitive adhesive layer having a dry film thickness of 1.5 μm, thereby preparing a magnetic recording layer transfer tape.

<2. Create ink for fluorescent pattern printing>
(Fluorescent printing ink [A])
Fluorescent material [A] 2 parts (“UVITEX OB” manufactured by Ciba Specialty Chemicals)
Polyurethane resin 2 parts ("TS-03" manufactured by Dainippon Ink & Chemicals, Inc.)
8 parts of vinyl chloride-vinyl acetate copolymer resin (“Solvine C5” manufactured by Nissin Chemical)
MEK 44 parts Toluene 44 parts The above materials were stirred and sufficiently dissolved in a disper to homogenize, and a pattern ink [A] was produced.

(Fluorescent printing ink [B])
Fluorescent material [B] 2 parts
(BASF “Lumogen F Violet 570”)
Polyurethane resin 2 parts ("TS-03" manufactured by Dainippon Ink & Chemicals, Inc.)
8 parts of vinyl chloride-vinyl acetate copolymer resin (“Solvine C5” manufactured by Nissin Chemical)
MEK 44 parts Toluene 44 parts The above materials were stirred and sufficiently dissolved in a disper to homogenize, and a pattern ink [B] was produced.

<3. Preparation of coating material for fluorescent diffusion prevention layer>
(Fluorescent agent anti-diffusion coating (with release from transfer substrate))
Cellulose acetate resin 8 parts ("L-20" manufactured by Daicel Chemical Industries)
Cellulose acetate propionate resin 2 parts
(Eastman Chemical "CAP-504-0.2"
Acetone 25 parts Ethyl acetate 25 parts Toluene 20 parts Cyclohexanone 20 parts Polyisocyanate 4 parts (Hardener No. 50 (active ingredient: 50%) manufactured by Dainippon Ink & Chemicals, Inc.)
Of the above materials, all except for the polyisocyanate are thoroughly stirred and dissolved in a disper, and then the above polyisocyanate is added, and further stirred and homogenized with a disper to obtain a coating material for a fluorescent agent diffusion prevention layer. Produced.

<4. Preparation of coating material for concealment layer>
(Concealment layer paint)
Sintered metal powder: 20 parts of aluminum powder (“210EA” manufactured by Showa Aluminum Powder Co., Ltd.)
16 parts of vinyl chloride-vinyl acetate copolymer resin (“VAGH” manufactured by Union Carbide)
4 parts of polyurethane resin (“TS-03” manufactured by Dainippon Ink & Chemicals, Inc.)
Methyl ethyl ketone 75 parts Toluene 75 parts Cyclohexanone 17 parts Polyisocyanate 5 parts ("Hardener No. 50 (active ingredient: 50%)" manufactured by Dainippon Ink & Chemicals, Inc.)
Of the above materials, all except for the polyisocyanate were stirred and sufficiently dissolved with a disper, and then the above polyisocyanate was added and further stirred and homogenized with a disper to prepare a paint for a colored layer.

Example 1
As fluorescent pattern printing, as shown in FIG. 6, the fluorescent printing ink [A] is applied on the surface of the heat-sensitive adhesive layer of the magnetic recording layer transfer tape prepared above so that the dry film thickness of the pattern portion becomes 1 μm by the gravure printing method. Fluorescent pattern printing was performed.
Next, the heat-sensitive adhesive layer of the magnetic recording layer transfer tape prepared above is overlaid on a card base oversheet (made by Taihei Chemical Co., Ltd.) made of polyvinyl chloride, and the temperature is 120 ° C. with a heat sealer (made by Tester Sangyo Co., Ltd.). The film was adhered under a pressure of 1 kg / cm ² for 5 seconds and heated and pressurized to remove the transfer substrate film. After that, heat is applied under the condition that the temperature is 130 to 140 ° C., the pressure is 20 kg / cm ² , the pressure is 20 kg / cm ² , and the pressure is 20 minutes for 20 minutes with a desktop test press (made by Tester Sangyo Co., Ltd.) The substrate was pressed and sufficiently cooled to produce a concealed card substrate.
Next, a masking layer coating material is applied on the masking card substrate prepared above to form a masking layer having a dry film thickness of 5 μm, and a fluorescent agent diffusion prevention layer coating material is applied thereon to a coating film having a dry film thickness of 1 μm. A fluorescent agent diffusion prevention layer is formed, and then subjected to hot-press pressing under a condition of heating and pressing at a temperature of 120 ° C., a pressure of 17 kg / cm ² , and a time of 20 minutes by a desktop test press machine (manufactured by Tester Sangyo Co., Ltd.). Then, it was cooled sufficiently to produce a concealment card.

(Example 2)
A concealment card was prepared in the same manner as in Example 1 except that the fluorescent printing ink of Example 1 was changed to fluorescent printing ink [B].

(Example 3)
In Example 1, the fluorescent pattern printing is not performed on the magnetic recording layer transfer tape, and the pattern portion is printed by the gravure printing method using the fluorescent pattern ink [A] on the portion where the magnetic stripe of the card substrate oversheet is transferred. As shown in FIG. 7, fluorescent pattern printing was performed so that the dry film thickness was 1 μm. Thereafter, a concealment card was created in the same manner as the concealment card creation method of Example 1.

Example 4
A concealment card was prepared in the same manner as in Example 3 except that the fluorescent printing ink in Example 3 was changed to fluorescent printing ink [B].

(Example 5)
A polyethylene terephthalate film with a thickness of 188 μm is used as the transfer substrate film, and a fluorescent agent diffusion prevention layer coating is applied thereon to form a fluorescent agent diffusion prevention layer with a dry film thickness of 1 μm. Then, a concealing layer having a dry film thickness of 5 μm was formed, and a heat-sensitive adhesive coating material was further applied thereon to form a heat-sensitive adhesive layer having a dry film thickness of 1 μm, thereby producing a concealment card transfer sheet.
Next, in the same manner as in Example 1, fluorescent pattern printing is performed on the heat-sensitive adhesive layer surface of the magnetic recording layer transfer tape prepared above, together with the transfer of the magnetic recording layer to the oversheet, the center core, and the oversheet on the opposite surface. A substrate for a concealment card was produced by hot pressing.
Thereafter, the heating adhesive layer side of the transfer sheet is superimposed on the magnetic tape side of the base material for the concealment card, and subjected to hot press processing under conditions of a temperature of 120 ° C., a pressure of 17 kg / cm ² , and a time of 20 minutes, Cooling was performed sufficiently to produce a concealment card.

(Example 6)
A concealment card was produced in the same manner as in Example 5 except that the fluorescent printing ink of Example 5 was changed to fluorescent printing ink [B].

(Example 7)
In Example 5, the fluorescent pattern printing is not performed on the magnetic recording layer transfer tape, and the gravure printing method using the fluorescent pattern ink [A] is applied to the portion where the magnetic stripe of the card substrate oversheet is transferred to FIG. As shown, fluorescent pattern printing was performed. Thereafter, a concealment card was created in the same manner as the concealment card creation method of Example 5.

(Example 8)
A concealment card was prepared in the same manner as in Example 7 except that the fluorescent printing ink in Example 7 was changed to the fluorescent printing ink [B].

Example 9
In Example 5, a fluorescent card printing was not performed on the transfer tape for the magnetic recording layer, but a hot press was performed as it was to produce a concealed card base material having no fluorescent pattern printing layer inside. Fluorescent pattern printing was performed on the magnetic recording layer of the concealed card base material using a fluorescent pattern ink [A] so that the film thickness of the pattern portion was 1 μm by a silk screen printing method. Thereafter, the coating for the concealing layer and the coating for the fluorescent agent diffusion preventing layer were applied and formed in the same manner as in Example 1, and then a concealing card was produced by a desktop test press machine (manufactured by Tester Sangyo Co., Ltd.).

(Example 10)
A concealment card was prepared in the same manner as in Example 9 except that the fluorescent printing ink in Example 9 was changed to fluorescent printing ink [B].

(Reference Example 1)
In the concealment card produced in Example 9, no hot pressing was performed after the formation of the concealing layer and the fluorescent agent diffusion preventing layer.

(Reference Example 2)
In the concealment card produced in Example 10, no hot pressing was performed after the formation of the concealing layer and the fluorescent agent diffusion preventing layer.

Evaluation method (fluorescence pattern concealment I)
The presence or absence of fluorescent light emission of the fluorescent pattern due to ultraviolet light contained in sunlight and indoor light was evaluated visually under sunlight and indoor light.
○ ・ ・ ・ Fluorescence emission is not visible at all.
Δ: Fluorescent light emission is visible but very slight.
X: Fluorescence emission is visible.

(Fluorescent pattern concealment II)
The presence or absence of visibility of the fluorescent printed pattern by visible light reflected light was evaluated visually under sunlight and indoor light.
○: The outline of the fluorescent pattern is not visible at all.
Δ: The outline of the fluorescent pattern is slightly visible.
X: A fluorescent pattern can be visually recognized.

(Fluorescence emission by UV irradiation)
Visually evaluate the fluorescence emission intensity of the fluorescent pattern by UV irradiation.
A sufficient fluorescence can be obtained.
Δ: Identifiable fluorescence is obtained, but the emission intensity is weak.
X: Insufficient fluorescence emission and poor visibility of fluorescent pattern.

(Output fluctuation)
About the obtained magnetic card, using a model 6900 magnetic card analyzer manufactured by Minato Electronics Co., Ltd., a 210 ftpi signal was recorded (recording current 100 mA) in JIS-2 format, and the output (maximum value, minimum value, average value) It was measured. From the result, the output fluctuation was obtained by the following equation. Regarding the transfer type magnetic tape used to make this magnetic card sample, the thickness of the magnetic recording layer is not single, but the thickness of the magnetic recording layer is adjusted according to each spacing and output. Adjustments were made so that the average value was equal to the reference card output.
Output fluctuation (%) = (maximum output value−minimum output value) / average output value ○: Less than 7%. Δ: 7% or more and less than 15%. X: 15% or more.

  As is clear from the results in Table 1, Examples 1 to 10 can ensure good fluorescence emission intensity, and the fluorescent pattern is not visually recognized by fluorescence emission due to ultraviolet rays contained in sunlight or indoor light. Further, in particular, in Examples 1 to 8, since the dye used for fluorescent pattern printing is diffused and colored in the magnetic recording layer and the concealing layer, the contour of the fluorescent printing is reflected on the concealing layer by the visible light reflection of sunlight or indoor light. There is no visible deformation, and the distance between the magnetic stripe surface and the magnetic recording layer does not change substantially between the fluorescent pattern part and the non-pattern part, so there is no output fluctuation caused by the fluorescent pattern. Yeah. On the other hand, Reference Example 1 and Reference Example 2 in which the fluorescent agent is diffused to make the fluorescent pattern visible by ultraviolet irradiation are not emitted in Reference Example 1 and Reference Example 2, and the fluorescent agent is localized on the magnetic recording layer. The output fluctuation is large because it remains.

It is a section lineblock diagram of a concealment card of the present invention. It is the flowchart which showed to manufacture of the base material for concealment cards among the manufacturing methods of this invention. It is the cross-sectional block diagram which showed the positional relationship of each structure part used for manufacture of the base material for concealment cards among the manufacturing methods of this invention. It is the flowchart which showed the manufacturing method in the case of manufacturing a concealment card | curd by application | coating using the base material for concealment cards among the manufacturing methods of this invention. It is the flowchart which showed the manufacturing method in the case of manufacturing a concealment card using the base material for concealment cards, and the laminated body for transcription | transfer among the manufacturing methods of this invention. It is the front view which gave fluorescent pattern printing to the transfer tape for magnetic recording layers of this invention. The front view of the state which gave the fluorescent pattern printing to the part to which the magnetic recording layer of the oversheet for card base materials of this invention was transcribe | transferred. The fluorescence emission image by ultraviolet irradiation of the concealment card | curd of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Oversheet 2 Center core 3 Center core 4 Oversheet 5 Magnetic recording layer 6 Hiding layer 7 Normal printing pattern 8 Fluorescent agent diffusion prevention layer (also protective layer)
9 Fluorescent Agent Diffusion Site 10 Transfer Substrate 11 Magnetic Recording Layer 12 Thermosensitive Adhesive Layer 13 Fluorescent Pattern 14 Transfer Laminate

Claims (8)

  A magnetic recording layer on at least a part of the card substrate; and a concealing layer laminated to conceal the entire surface of the card substrate on the side having the magnetic recording layer; A method of manufacturing a concealment card having a fluorescent pattern that can be identified by ultraviolet irradiation, wherein the fluorescent pattern is formed in advance on the card substrate side prior to lamination, and the fluorescent agent of the fluorescent pattern is used as the concealment card. A method for manufacturing a concealment card, characterized in that the fluorescent pattern can be identified by diffusing in a direction to be a surface at the time of formation.   The concealment card manufacturing method according to claim 1, wherein the fluorescent pattern is formed on the card substrate before the magnetic recording layer is formed.   The method for manufacturing a concealment card according to claim 1, wherein the fluorescent pattern is formed on a transfer laminate for forming the magnetic recording layer.   The said fluorescent pattern is formed on the said base material for cards after the layer containing the said magnetic-recording layer was formed on the said base material for cards, or on the said magnetic-recording layer. Manufacturing method of concealment card.   The concealing card manufacturing method according to claim 1, wherein the fluorescent agent is an organic fluorescent dye.   The method for manufacturing a concealing card according to claim 1, wherein a substantially transparent diffusion preventing layer for preventing diffusion of the fluorescent agent is provided on the concealing layer.   A magnetic recording layer on at least a part of the card substrate; and a concealing layer laminated to conceal the entire surface of the card substrate on the side having the magnetic recording layer; It is a concealment card having a fluorescent pattern that can be identified by irradiation of ultraviolet rays, and the fluorescent agent that forms the fluorescent pattern is distributed over the entire width in the film thickness direction of the concealing layer at a position corresponding to the fluorescent pattern. Characteristic concealment card. The concealment card according to claim 7, wherein the fluorescent agent is distributed over the entire width in the film thickness direction of the concealing layer and the magnetic recording layer.

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