JP4085465B2 - Magnetic visible recording medium and manufacturing method thereof - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a magnetic visible recording medium having a magnetic visible recording portion and a magnetic visible recording medium for displaying characters and images as visible information that can be recorded and erased by applying a magnetic field with excellent resolution and image stability. In particular, the present invention relates to a technique for preventing damage to a magnetic visible recording portion when a magnetic visible recording medium is manufactured or used, and effective for simplifying the manufacturing process by integration.
[0002]
[Prior art]
Conventionally, a digital information recording means such as a magnetic recording system such as a magnetic card, an optical recording system such as an optical card, and an IC recording system such as an IC card is provided on a recording medium. Therefore, it is widely used as a portable information recording medium because of its high reliability and high read / write capability. By the way, although it is portable and highly convenient, a reading / writing device is necessary. Therefore, it has been desired to always obtain information from an information recording medium by visual observation.
[0003]
Therefore, for example, as disclosed in Japanese Patent Publication No. 40-19226, a magnetic medium comprising a support and a hydrophobic liquid and a microcapsule layer of about 50 μm containing plate-like magnetic fine particles having an average diameter of about 15 μm and a protective layer are provided. Layered microcapsules made of a suspension of flaky magnetic fine particles with high light reflectivity and a fluid on the back surface of a transparent substrate, as disclosed in JP-A-63-291217. A visible magnetic recording sheet that forms a coated display layer and a magnetic recording layer, maintains orientation by a writing magnetic field to the magnetic recording layer and orientation by residual magnetic force, and reflects or diffuses incident light by oriented magnetic fine particles, Disclosed in JP-A-64-19384, and a display body in which a microcapsule comprising a flaky magnetic powder responsive to an external magnetic field and movably included is coated on a base material; JP-A-5-16578, JP-A-5-16579, JP-A-7-112592, JP-A-7-172084, JP-A-7-7 -228082 and the like.
[0004]
In addition, a magnetic display unit composed of a magnetic recording layer on which a microcapsule containing a liquid and a magnetic powder floating in the liquid and sensitive to a magnetic field is formed, and information recording means such as an IC memory, a magnetic tape, and an optical recording medium are provided. There is a magnetic display medium provided together, or Japanese Patent Application Laid-Open No. 7-29145, Japanese Patent Application Laid-Open No. 7-29146, Japanese Patent Application No. 6-325789, Japanese Patent Application No. 7-122330, etc. And a magnetic recording layer including a microcapsule containing a dispersion medium that exhibits a solid state at room temperature to disperse the magnetic particle, and the magnetic particles can be oriented by applying a horizontal magnetic field and a vertical magnetic field thereto. There are magnetic recording media, etc., all of which provide information recording display in microcapsules with plate-like magnetic fine particles that can be rotated and oriented in the direction of the applied magnetic field. Rotate oriented particles, and forms a visible image by the contrast with the background (ambient).
Generally, a visible image is produced by arranging the entire magnetic display unit in the horizontal direction or the vertical direction and rotating and orienting the plate-like magnetic fine particles in different directions according to recorded information.
[0005]
Such a magnetic display medium has a structure in which a magnetic display unit is laminated on a support, or a structure in which a magnetic display unit is disposed in a recess provided in the support.
(A) A method of obtaining a recording medium by cutting a laminate obtained by laminating a colored layer, a microcapsule layer composed of a microcapsule and a binder, a protective layer, and the like on the entire surface of a substrate, for example, into a portable shape such as a card,
(B) A microcapsule layer composed of microcapsules and a binder (or oil), a colored layer, and the like are laminated on a transparent substrate, and the visible display member is cut into small pieces having a shape necessary for visible display, and this is cut on the support. A method of obtaining a recording medium by being attached to or embedded in a recess provided on a support,
Is used.
In these methods, since the microcapsule layer is cut by cutting, the contents such as microcapsules and binder (or oil) constituting the microcapsule layer are leaked from the end portion of the display portion. Even in the recording medium arranged in the above, contents such as microcapsules and binder (or oil) leak from the end of the embedded surface, which is a problem.
[0006]
In addition, in the magnetic display medium having a structure in which the magnetic visible recording portion is laminated on the support, the thickness of the magnetic recording portion is large. Therefore, when forming a card having an upper limit, the support is thinned. Therefore, there is a problem that the strength of the magnetic display medium is reduced, and the magnetic display medium having a structure in which the magnetic display part is embedded in the concave part provided in the support member requires processing of the concave part or cutting. There is a problem in that the strength of the bottom surface of the recess is reduced.
Further, the above-mentioned method in which the visible display member is smaller than the recording medium and the display member is pasted on the support causes a step on the surface of the recording medium, resulting in problems in appearance, durability and printing of the recording medium. There is. Further, the method of embedding the visible display member by providing the concave portion on the support is difficult to make the surface of the visible display member and the surface of the recording medium flush with each other.
[0007]
In order to solve the above problems, an injection molding method using a resin and a filling manufacturing method using an adhesive have been proposed. The injection molding method uses a label in which a microcapsule part is formed on a transparent base material, which is placed in a predetermined place in a mold, and the resin is injected onto the entire surface of the microcapsule. Is a method of forming a magnetically visible recording medium by covering the surface. On the other hand, the adhesive filling method is a method of manufacturing such a magnetic visible recording medium by filling an adhesive between the transparent base material on which the microcapsule portion is formed and another base material of the magnetic visible recording medium. .
In any method, since the resin is entirely covered on the microcapsule portion, leakage of contents in the microcapsule can be prevented. Furthermore, since the opposite transparent substrate surface on which the microcapsule portion is formed is the surface of the recording medium, the surface becomes an integrated smooth surface.
By these methods, a method for producing a magnetic visible recording medium flush with a surface and a magnetic visual recording medium capable of simplifying the production process by preventing damage and integrating the magnetic visible recording part during production and use of the magnetic visible recording medium. A recording medium can be provided.
[0008]
According to these methods, the microcapsule portion must be partially formed on the transparent substrate. As a forming method, a screen printing method, a nozzle coating method, or a transfer method can be used.
However, according to these forming methods, since the film thickness of the microcapsule part is thick and the fluidity of the coating material of the microcapsule is poor, it is very difficult to finish the edge of the microcapsule part smoothly. The surface of the edge portion is likely to be rough, and the appearance of the recording medium is likely to be adversely affected. In this case, the required quality cannot be satisfied, which is a problem.
[0009]
[Problems to be solved by the invention]
The present invention has been made in view of the problems of the prior art described above, and the object of the present invention is to manufacture and use the magnetic visible recording medium without deteriorating the appearance of the magnetic visible recording medium. It is possible to prevent damage to the magnetic visible recording portion of the magnetic recording medium and to simplify the manufacturing process by integration, and to provide a magnetic visible recording medium having a flush surface and a manufacturing method thereof.
[0010]
[Means for Solving the Problems]
As a means provided by the present invention to achieve the above object, first, the invention shown in claim 1 includes a transparent substrate, a magnetic microcapsule portion,A concealment layer;The magnetic microcapsule part includes at least magnetic particles and a microcapsule including a dispersion medium in which the magnetic microcapsules are dispersed in a binder, and the magnetic particles are externally provided. The magnetic capsule has a magnetic visual function that uses rotational contrast in the microcapsules by a change in the direction of the magnetic field, and uses the contrast generated by the difference in the orientation of the magnetic particles as visible information,The concealing layer has a frame shape, and has a magnetic microcapsule portion in a recess formed by the transparent base material and the concealing layer.It is the magnetic visible recording medium characterized by the above-mentioned.
[0012]
  Claim2The invention shown inClaim 1This is characterized in that a character and / or pattern layer is provided between the concealing layer and the transparent substrate.
[0013]
  Claim3The invention shown in FIG.Or 2In particular, a transparent base material similar to the transparent base material is provided on the opposite surface of the magnetic visible recording portion of the recording medium.
[0014]
  Claim4The invention shown in at least a transparent substrate and a magnetic microcapsule partWith concealment layerThe magnetic microcapsule portion includes at least magnetic particles and a microcapsule containing a dispersion medium in which the magnetic microcapsules are dispersed in a binder, and the magnetic particles have an external magnetic field. In a method for producing a magnetic visible information recording medium having a magnetic visible function, wherein the contrast produced by the difference in orientation of magnetic particles is rotationally oriented in the microcapsules due to a change in direction, and the contrast is used as visible information.Providing the concealing layer in a frame shape on the transparent substrate;Said transparent substrateAnd a magnetic microcapsule portion in a recess formed by the frame-shaped concealing layerA method for producing a magnetic visible recording medium, characterized in that
[0015]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the present invention will be described in detail with reference to the drawings.
FIG. 1 is a schematic view for explaining a method for producing a magnetic visible recording medium of the present invention, FIG. 2 is a plan view of the magnetic visible recording medium of the present invention, and FIGS. It is sectional drawing which shows the Example of a recording medium, respectively.
[0016]
First, FIG. 2 is a plan view of the magnetic visible recording medium of the present invention. On the surface of the transparent substrate 13, the display surface 10 of the magnetic visible recording section 12, the concealing layer 17, the print layer 18, characters and the like are formed. ing. Since the external appearance of the magnetic visible recording medium of the present invention is almost the same, FIG. 2 is a representative view, and cross-sectional views along line AA are shown in FIGS. 3 and 4 as two embodiments, respectively.
[0017]
The magnetic visible recording medium 1, 2, 3 is a magnetic visible recording portion comprising a magnetic microcapsule portion 15 made of a coating agent in which microcapsules containing at least a transparent substrate 13, a concealing layer 17, flaky magnetic particles and the like are dispersed in a binder. 12, the recording medium is sequentially laminated from the medium base 11. Here, the magnetic visible recording portion 12 is formed by partially coating a transparent base material 13 with a coating agent obtained by dispersing microcapsules containing flaky magnetic particles and the like in a binder.
A recording medium is formed by a recording medium forming method such as a resin injection method, a heat laminating method, and an adhesive filling method using the transparent base material 13 on which the magnetic visible recording portion 12 is formed.
[0018]
Next, the configuration of the magnetic visible recording medium will be described.
First, the transparent substrate 13 is a surface layer of a magnetic recording medium, and holds and protects the microcapsule layer 15 of the magnetic visible recording portion 12, has mechanical strength, and has light transmittance. For example, polyethylene terephthalate resin, polyvinyl chloride resin, vinyl chloride vinyl acetate copolymer resin, polyester resin, polycarbonate resin, polymethyl methacrylate resin, polystyrene resin tetrafluoroethylene resin, ABS resin, A synthetic resin such as a polypropylene resin can be used alone or as a mixture of two or more resins, a copolymer, ceramics, a glass thin plate, or the like.
[0019]
The concealing layer 17 according to the present invention may be any layer as long as it conceals the edge of the magnetic microcapsule portion 15 and has a high concealing property and does not transmit light. A colored layer made of a resin binder, a polycrystalline body that irregularly reflects light, or the like may be used. In the case of using a metal thin film, for example, a thin film of a single metal such as Al, Sn, Cu, Ni, Ti, Co, or an alloy can be used.
When forming a colored layer, for example, metal powder pigments, mica, carbon black, calcium carbonate, barium sulfate, titanium oxide, mica, opal, iron oxide pigments, metal oxides such as complex iron oxide pigments, inorganics such as bitumen Organic pigments such as pigments and insoluble azo pigments, phthalocyanine pigments, daylight fluorescent pigments, ultraviolet phosphors, and condensed polycyclic pigments can be used by dispersing them in a binder. As the binder, for example, a resin binder such as an acrylic resin, a polyester resin, a vinyl chloride vinyl acetate copolymer resin, and an acrylic nitrocellulose copolymer resin can be used. When using a polycrystal, a glass polycrystal, a ceramic polycrystal, etc. can be used, for example.
[0020]
As a method for forming the concealing layer 17, a vapor deposition method, a sputtering method, a CVD chemical vapor deposition method, an electroless plating method, a printing method, a transfer method, a coating method, and the like can be used. An appropriate method can be selected from the above methods.
[0021]
As the shape of the concealment layer 17, it is preferable to use a frame shape that completely conceals the edge of the magnetic microcapsule portion 15 and does not hinder the reading and displaying of the visible record information of the magnetic microcapsule portion. In some cases, an intermediate layer such as a printing layer 18 such as a pattern, a primer layer, or an adhesive layer may be provided between the concealing layer 17 and the transparent substrate 13.
[0022]
The magnetic microcapsule 15 has a structure in which a suspension core material mainly composed of at least flaky magnetic particles and a dispersion medium is encapsulated with a shell material made of a polymer or the like. An organic solvent or the like is used as the dispersion medium. In order to stabilize visible recording, it is preferable to use a dispersion medium (for example, an organic compound such as wax) that exhibits a solid phase at room temperature. Furthermore, a mixed suspension of an organic solvent in a liquid state at normal temperature and a dispersion medium in a solid phase at normal temperature may be used.
[0023]
The structure of this magnetic microcapsule is, for example, various kinds of iron oxides such as γ-ferrite, magnetite, Mn ferrite, Mn-Zn ferrite, and Co-coated γ-ferrite as flaky magnetic particles, iron, nickel, iron / nickel, It is possible to use stainless steel such as iron, nickel, and chromium, fine particles such as cobalt, cobalt, aluminum, samarium, cobalt alloy, etc. in a flake shape (scale shape) or plate shape using an atomizer, a hammer mill, or the like.
[0024]
The coercive force of the magnetic particles is not particularly limited, but when the coercive force is 60 Oe (Oersted) or less, the magnetic particles can be oriented even with a relatively weak magnetic field. In order to increase the affinity of the magnetic particles with an organic solvent or the like, a higher ester treatment, a silane coupling treatment, a titanate coupling treatment, or the like is preferably performed. The size of the flaky magnetic particles in the present invention is such that the particle size is 5 to 30 μm and the thickness is 0.1 considering the ease of rotation within the microcapsule by application of magnetism, the image contrast of the magnetic visible recording portion, and the like. It is preferably between ˜3 μm.
[0025]
About a dispersion medium, it will be in a fluid state when heated to the temperature more than normal temperature (a range of about 40-100 degreeC) as a solid dispersion medium (it shows a solid-phase state) at normal temperature (a range of about 10-35 degreeC). For example, organic compounds such as paraffin wax, carnauba wax and other natural or synthetic waxes, natural or synthetic resins, or carboxylic acid esters, which are generally known, satisfying the above conditions alone or in combination. It can be used as appropriate.
An inert solvent such as olive oil, chlorinated diphenyl, light oil, dodecylbenzene, or other nonpolar oil vehicle can be used as a liquid dispersion medium at room temperature (in the range of about 10 to 35 ° C.).
[0026]
A core material mainly composed of the above-mentioned flaky magnetic particles, a dispersion medium or the like is covered with a shell material such as a polymer to be microencapsulated.
Resins used as the shell material include commonly used resins such as acrylic resins, methacrylic resins, polystyrene, polyester resins, polyurethane resins, polyurea resins, polyamide resins, epoxy resins, natural resins, and the like. These can be used alone or in admixture of two or more.
[0027]
The magnetic microcapsule 15 having the shell material described above includes a phase separation method in which a concentrated polymer phase is separated around a core material dispersed in a polymer solution, and a polymer is cured around the core material in the polymer solution. Liquid curing coating method that cures the polymer with a test agent, etc., in situ polymerization method in which the surface of the core material is covered with the polymer by supplying a monomer or polymerization catalyst from either the emulsion in which the core material is dispersed or the outer phase. A microencapsulation technique such as an interfacial polymerization method in which a monomer is supplied from both an inner phase and an outer phase of an emulsion in which a core material is dispersed is suitable, but is not limited to these methods.
[0028]
In particular, by using an in-situ polymerization method in which a monomer is supplied from the external phase of a suspension in which a core substance is uniformly dispersed in a dispersion medium, or by using a phase separation method, the movement of flaky magnetic particles having a uniform particle size is achieved. Can be manufactured easily.
As the polymerizable monomer used here, acrylic acid ester, methacrylic acid ester, styrene and derivatives thereof, isocyanate, various amines, compounds having an epoxy group, and the like are suitable.
[0029]
As the binder for dispersing the magnetic microcapsules 15, an aqueous binder, a solvent binder, an emulsion binder, or the like is appropriately used.
[0030]
The transparent substrate 13 may be colored in a range that does not affect the display reading of the lower magnetic visible recording unit 12, or may be provided with a colored layer and a protective layer having optical transparency. In addition, a pigment or dye is mixed for coloring of the colored layer and the protective layer, or when a colored layer is provided, the transparent substrate 13 is formed by dispersing or dissolving the pigment or dye in a binder or the like.
[0031]
These magnetic visible recording portions 12 are formed on the transparent base material 13 on which the concealing layer 17 is formed by, for example, a known printing method such as an offset printing method, a gravure printing method, a silk screen printing method, a roll coating method, Magnetic visible recording by various forming methods such as coating method such as knife edge method, transfer method with transfer sheet in transfer layer mixed with magnetic microcapsules, and ink jet method that sprays ink mixed with magnetic microcapsules onto substrate The edge portion of the portion 12 can be formed so as to be laminated on the concealing layer 17 and can be appropriately selected according to the situation such as the use and quantity of the magnetic visible recording medium. Further, a colored layer 20 can be provided on the magnetic visible recording portion 12.
[0032]
As the base material 11 of the recording medium, an appropriate base material can be selected by a method for forming the recording medium. In the case of using the resin injection method, the molding resin for the recording medium substrate may be any resin that can be used as a substrate such as a card, and those having physical properties suitable for the injection molding method are particularly preferable.
For example, general polystyrene resin, impact polystyrene resin, acrylonitrile styrene resin, ABS resin, acrylic resin, polyethylene resin, polypropylene resin, polyamide resin, polyacetal resin, polycarbonate resin, polyvinyl chloride resin, modified PPO resin, polybutylene terephthalate Examples include resins, polyphenylene sulfide resins, polyester resins, polyethylene terephthalate resins, polymethyl methacrylate resins, and other thermoplastic resins, or alloy resins based on composites of these materials, and reinforced resins by the addition of glass fibers or pigments. It is done.
Furthermore, biodegradable resins such as polylactic acid, polycaprolactone, poly (3-hydroxybutyrate-3hydroxyvalerate), and polyvinyl alcohol resin can be used.
[0033]
The above resin may be a single resin or a mixture of two or more resins, and can be appropriately selected according to the use of the magnetic visible recording medium. There may be. The transparent substrate 13 on which the magnetic visible recording portion is formed is placed in a recording medium mold, and the above resin is injected to form a recording medium.
[0034]
When using a method for forming a recording medium by filling an adhesive, a natural resin, a synthetic resin, or the like can be used as the adhesive.
For example, between the transparent substrate 13 on which the magnetic visible recording portion is formed using an adhesive such as urea resin, epoxy resin, urethane resin, vinyl acetate resin, ethylene vinyl acetate copolymer resin, and acrylic resin, and another substrate The recording medium can be formed by filling the film.
[0035]
When forming a recording medium by thermal lamination, a thermoplastic resin sheet is used as the recording medium substrate.
For example, a single resin such as an ABS resin, a polyester resin, a vinyl chloride resin, a vinyl acetate resin, an acrylic resin, a copolymer of these resins, and a mixture sheet can be used. A recording medium is formed by thermally laminating these resin sheets and the transparent substrate 13 on which the magnetic visible recording portion is formed.
[0036]
Further, in order to prevent twisting and warping of the recording medium due to thermal shrinkage or the like in the forming process of the recording medium, a transparent base material 13 having a magnetic microcapsule portion formed on the opposite surface of the magnetic visible recording portion on the recording medium; The same medium surface sheet 14 can also be formed.
In particular, when an orientation base material such as PET is used as the transparent base material, it is preferable to form the same PET 14 with the same orientation on the opposite surface of the recording medium.
[0037]
Further, when the above-described magnetic visible recording medium is formed, a recording function such as an IC module 21, an optical recording layer, a magnetic recording layer, or the like can be provided in the medium. Also, a known anti-counterfeiting technology and security technology can be given to the recording medium.
[0038]
IC modules include a contact type in which electrical connection with the outside is made through an external connection terminal, and a non-contact type (contactless type) in which data and energy are transmitted and received without using an external connection terminal.
As an example of a non-contact IC module, for example, an IC chip such as a CPU and a memory, and other electronic circuit components are electrically connected and mounted on a printed circuit board, and further includes an insulation coated conductor as a communication antenna. The loop antenna 35 is connected via an antenna terminal on the printed circuit board.
The IC module is resin-sealed with a resin such as an epoxy resin, a polypropylene resin, or a polyamide resin as necessary. In addition, there are a method of incorporating a battery as a power source and a method of receiving electromagnetic waves transmitted from an external data processing device with a loop antenna and obtaining electric power from the electromagnetic waves. The former can operate more actively, and the latter is a battery. It has the feature that there is no worry about the lifetime.
[0039]
Other antennas include a microstrip antenna printed on a printed circuit board, a coil antenna, and a capacitor. As another method, an electromagnetic induction method comprising a dedicated or dual-purpose coil as a function of a power supply by electromagnetic induction and a communication antenna by electromagnetic induction, and an electrostatic plate for the above data communication using this electromagnetic induction method as a power source. There are some which combine the electrostatic capacity systems to be used, and there are some which supply power by batteries.
[0040]
As another method, in the optical communication method, the communication means is composed of an LED of a light emission source and a PD of a light receiver, and data is transmitted / received by turning on / off the light. These IC modules are sealed with epoxy resin, polypropylene resin or the like from the viewpoint of convenience in handling.
[0041]
【Example】
Hereinafter, specific examples of the present invention will be given and described in detail.
[0042]
<Example 1>
Production of magnetic microcapsules:
60 parts by weight of flaky nickel particles (coercive force 45 Oe) subjected to silane coupling treatment are uniformly dispersed in 80 parts by weight of paraffin wax having a melting point of 60 ° C. heated to 60 ° C. and melted at 60 ° C. The mixture was dispersed in 200 parts by weight of a 10% gelatin aqueous solution heated to about 5 minutes using a homogenizer so that the average particle size became 80 μm at a rotational speed of 2000 rpm. To the obtained dispersion, 200 parts by weight of a 10% aqueous gum arabic solution was mixed, 1000 parts by weight of water was further added, the temperature was kept at 40 ° C., and a 10% aqueous acetic acid solution was added dropwise to adjust the pH to 4. Thereafter, the liquid temperature was cooled to 5 ° C., 10 parts by weight of 30% formalin aqueous solution was added, 10% sodium hydroxide aqueous solution was added dropwise to adjust the pH to 9, and a magnetic microcapsule 15 having a gelatin-arabic gum wall was produced. .
[0043]
Formation of concealment layer:
An easy-adhesion layer having the following composition is coated on a transparent polycarbonate (transparent substrate 13) having a thickness of 100 μm and a size of 150 × 150 mm by a gravure coating method so that the film thickness becomes 2 μm. Further, a concealing layer paint having the following composition was further printed on the entire surface (film thickness: 5 μm) on the outside of a 50 × 30 mm rectangular frame by a screen printing method to form a concealing layer 17.
[0044]
Easy adhesive layer composition:
25 parts of polyester resin
Toluene / MEK solvent 75 parts
[0045]
Concealment layer composition:
Titanium oxide pigment 30 parts
1 part of surfactant
20 parts of vinyl chloride resin
49 parts of cyclohexanone solvent
[0046]
Production of magnetic visible recording part:
On the transparent polycarbonate sheet with a thickness of 100 μm on which the above-mentioned concealing layer is formed, the edge portion conceals the coating liquid in which 10 parts by weight of microcapsules having the above composition and 5 parts by weight of acrylic emulsion as a binder are mixed by a mask clean method. A rectangle having a film thickness of about 100 μm and 55 × 35 mm is applied so as to fall within the frame of the layer, and a colored layer (5 μm) 20 having the following composition is further coated on the magnetic visible recording portion 12 and the transparent substrate 13 by a gravure coating method. The magnetic visible recording portion 12 was formed by coating the entire surface.
[0047]
Colored layer composition:
20 parts of carbon black
30 parts of vinyl chloride resin
50 parts of toluene / MEK solvent
[0048]
Formation of recording medium:
The transparent substrate 13 with the magnetic visible recording part 12 produced as described above is cut into the shape of a recording medium having a size of 85 × 54 mm, and is opposite to the side on which the magnetic visible recording part 12 is formed on the injection mold. The surface of the transparent substrate 13 is placed and fixed in close contact with the mold surface, the injection mold is closed, and a cavity filled with resin is formed between the molds. A predetermined amount of molten acrylonitrile styrene resin was injected and filled, and after cooling and solidifying, the mold was opened and the molded product was taken out. The magnetic visible recording medium 2 was produced as described above. On the surface of the magnetic recording medium 2, the edge portion of the magnetic visible recording portion was completely hidden by the shielding layer, and a good appearance was obtained.
[0049]
The entire surface of the magnetic visible recording medium 2 is heated to 60 ° C., and a magnetic field is applied from the outside to the magnetic visible recording unit 12 in the horizontal direction, and the flaky magnetic particles in all the magnetic microcapsules 15 are removed from the magnetic visible recording unit 12. The magnetic visible recording part 12 was set in an unrecorded state by being oriented so as to be horizontal with respect to the surface.
Next, the magnetic visible recording unit 12 is partially heated to 60 ° C. in accordance with display information to be recorded, and a magnetic field is applied in a direction perpendicular to the magnetic visible recording unit 12 so that the flaky magnetic particles are applied to the magnetic visible recording unit 12. Visible information was recorded on the microcapsules 15 by being oriented in the vertical direction.
By the above operation, an image of visible information can be formed.
[0050]
<Example 2>
Production of magnetic microcapsules:
50 parts by weight of flaky nickel / iron alloy (permalloy) particles treated with olefin acid are uniformly dispersed in 80 parts by weight of a mixed solvent of paraffin wax and dibutyl phthalate dissolved by heating to 50 ° C. This dispersion Was dispersed in 200 parts by weight of 5% polyvinyl alcohol heated to 50 ° C., and was dispersed using a homogenizer for about 5 minutes so as to have an average particle diameter of 80 μm at a rotational speed of 2000 rpm. To the obtained dispersion, 100 parts by weight of a melamine-formalin prepolymer aqueous solution was mixed, and a 20% aqueous acetic acid solution was added dropwise to adjust the pH to 6. Thereafter, the liquid temperature was raised to 65 ° C., and a polymerization reaction was carried out for 30 minutes to produce melamine-formalin wall microcapsules.
[0051]
Formation of concealment layer:
Printing of the design by offset printing on the outside of the 40 × 20 mm frame on which the magnetic microcapsule part 15 is to be formed on a transparent polyethylene terephthalate (PET) resin sheet (transparent substrate 13) having a thickness of 100 μm which has been subjected to easy adhesion treatment The layer 18 was printed, and the concealing layer paints (1) and (2) having the following composition were sequentially printed on the outside of the 40 × 20 mm frame (each having a film thickness of 5 μm) to form the concealing layer 17 by screen printing. .
Further, as the medium surface sheet 14 for the other surface of the recording medium, transparent polyethylene terephthalate is used in the same manner as the transparent substrate 13, and a concealing layer paint (1) having the following composition is used on the other surface of the sheet. The whole surface was coated by gravure coating (film thickness 5 μm) to obtain a medium surface sheet 14 of a recording medium.
[0052]
Concealment layer composition:
Concealment layer (1)
Titanium oxide pigment 30 parts
1 part of surfactant
20 parts of vinyl chloride resin
49 parts of cyclohexanone solvent
Concealment layer (2)
30 pieces of aluminum pesto
Surfactant 5 parts
20 parts of polyester resin
45 parts of cyclohexanone solvent
[0053]
Production of magnetic visible recording part:
10 parts by weight of microcapsules having the above composition and 5 parts by weight of polyvinyl alcohol as a binder were mixed on a transparent PET sheet (transparent substrate 13) having a thickness of 100 μm on which the concealing layer 17 had been formed by a mask screen method. The coating liquid was applied on the outside of the window frame with a thickness of about 90 μm and a 45 × 25 mm rectangle was applied so that the edge of the microcapsule layer 15 overlapped with the concealing layer 17, and a colored layer (5 μm) having the following composition: 20 was applied on the entire surface of the transparent sheet by a gravure coating method to form the magnetic visible recording portion 12.
[0054]
Colored layer composition:
20 parts of carbon black
30 parts of vinyl chloride resin
50 parts of toluene / MEK solvent
[0055]
Production of recording media:
Using two white PVC sheets with a thickness of 250 μm, the surface of both sides was coated with 5 μm of urethane adhesive layer 19 by a gravure coating method to obtain a medium base 11 of a recording medium. A non-contact IC module inlet 21 (polyimide film base) is fixed between two PVC sheets so as to be arranged at a predetermined position, and the transparent base material 13 with the magnetic visible recording portion 12 and the medium surface sheet 14 are fixed. Are stacked on the PVC sheet of the medium substrate 11, integrated by thermal lamination, and cut to form the recording medium 3. What is important here is to align the transparent base material 13 with the magnetic visible recording portion and the medium surface sheet 14 with the same orientation method. If they are not aligned, problems such as twisting and warping may occur in the resulting recording medium. is there. The recording medium obtained above had a good appearance and was free from twisting and warping.
[0056]
The entire surface of the magnetic visible recording medium 3 is heated to 50 ° C., and a magnetic field is applied from the outside to the magnetic visible recording portion 12 in the horizontal direction, and the flaky magnetic particles in all the microcapsules 15 are removed from the surface of the magnetic visible recording portion 12. The magnetic visible recording part 12 was set in an unrecorded state.
Next, the magnetic visible recording unit 12 is partially heated to 50 ° C. in accordance with the display information to be recorded, and a magnetic field is applied in the direction perpendicular to the magnetic visible recording unit 12 so that the flaky magnetic particles are applied to the magnetic visible recording unit 12. Visible information was recorded on the microcapsules 15 by being oriented in the vertical direction.
With the above operation, a visible image that is ID data of a person on the recording medium can be formed.
[0057]
【The invention's effect】
In general, according to the present invention, portions that are unsightly from an aesthetic point of view are concealed so as not to impair the beauty of the appearance of the magnetic visible recording medium. It is possible to effectively prevent breakage of the parts, simplifying the manufacturing process through structural integration, and satisfying that the surface is flush, It was possible to provide a satisfying magnetic visible recording medium and a method for manufacturing the same.
[Brief description of the drawings]
FIG. 1 is an explanatory view showing an outline of a production method relating to a magnetic visible recording medium of the present invention.
FIG. 2 is an explanatory view showing an outline of another manufacturing method related to the magnetic visible recording medium of the present invention in a plan view.
FIG. 3 is an explanatory diagram showing a schematic cross-sectional view of an embodiment relating to a magnetic visible recording medium of the present invention.
FIG. 4 is an explanatory diagram showing a schematic cross-sectional view of another embodiment relating to the magnetic visible recording medium of the present invention.
[Explanation of symbols]
1, 2, 3 ... Magnetic visible recording medium
10 .... Display surface
11. Base material
12 ... Magnetically visible recording part
13 ・ ・ ・ ・ ・ ・ Transparent substrate
14... Media surface sheet
15 ... Magnetic microcapsules
16 .... Binder
17 ... Concealment layer
18 .... printing layer
19 .... Adhesive layer
20. Colored layer
21 ・ ・ ・ ・ ・ ・ IC module
22 ... Easily adhesive layer

Claims (4)

At least a transparent base material, a magnetic microcapsule part, a concealing layer, and a base material that supports them, and the magnetic microcapsule part is a microcapsule including at least magnetic particles and a dispersion medium in which the magnetic particles are dispersed. Dispersed in a binder, the magnetic particles are rotationally oriented in the microcapsule by a change in the direction of the external magnetic field, and have a magnetic visual function that uses the contrast generated by the difference in the orientation of the magnetic particles as visible information. A magnetic visible recording medium, wherein the concealing layer has a frame shape, and a magnetic microcapsule part is formed in a recess formed by the transparent base material and the concealing layer . The magnetic visible recording medium according to claim 1 , wherein a character and / or pattern layer is provided between the concealing layer and the transparent substrate. Wherein the opposite surface of the magnetic visual recording portion of the recording medium, a magnetic visual recording medium according to claim 1 or 2, characterized in that providing the transparent substrate and the same transparent substrate. At least a transparent base material, a magnetic microcapsule part, and a concealing layer are supported by the base material, and the magnetic microcapsule part includes at least a magnetic capsule and a dispersion medium in which the magnetic particles are dispersed in a binder. The magnetic particles have a magnetic visible function in which the magnetic particles are rotationally oriented in the microcapsules due to a change in the direction of the external magnetic field, and the contrast generated by the difference in the orientation of the magnetic particles is used as visible information. In the method for producing a visible information recording medium, the concealing layer is provided in a frame shape on the transparent substrate, and a magnetic microcapsule portion is provided in a recess formed by the transparent substrate and the frame-shaped concealing layer. A method for producing a magnetically visible recording medium.

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