JPH07192104A - Magnetic visible recording medium - Google Patents

Abstract

PURPOSE:To provide a magnetic visible recording medium which is capable of performing a reversible display that a part on which magnetism is impressed is clear in contacts which is different from a non-impressed part, is high in resolution, clear and excellent in the stability of an image. CONSTITUTION:In the magnetic visible recording medium 1, a microcapsule 14 composed by including at least platy or flaky magnetic fine particle 15 and solvent 16 in a magnetic visible recording layer 12, and a magnetic body 18 are dispersedly arranged in a binder 17, therefore, the magnetic fine particle 15 in the microcapsule 14 and the magnetic body 18 are magnetized by the impression of an external magnetic field, the magnetic fine particles 15 are arranged in the impression magnetic field direction and an image is recorded. Even if the recording medium 1 is deviated from the impressed magnetic field, the array direction of plate state or scale piece state magnetic particulates 15 is maintained by the residual magnetic field held in the magnetic material 18 and an image is stabilized.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic visible recording medium capable of displaying a visible image by magnetism, and particularly to a magnetic visible recording medium which is strong against the influence of an external magnetic field and capable of forming a stable image. Regarding

[0002]

2. Description of the Related Art As a magnetic visible recording medium 10, Japanese Patent Publication No.
Hydrophobic liquid 2 as described in JP-A-0-19226.
7 and a microcapsule layer 23 composed of microcapsules 25 having a diameter of about 50 μm containing plate-like magnetic fine particles 26 having an average diameter of about 15 μm are provided on a support 22, and a protective layer 24 is further provided on the support 22.

The magnetic visible recording medium 10 is constructed so that the plate-like magnetic fine particles 26 in the microcapsules 25 can easily rotate and move in the microcapsules 25 by an externally applied magnetic field. That is, as shown in FIG. 6, the plate-like magnetic particles 26 in the microcapsules 25 are normally arranged in a random state, but when a magnetic field is applied from the outside, the plate-like magnetic particles 26 are applied in the direction of the applied magnetic field. Then, the microcapsules 25 are rotated and moved to generate a new array.

Accordingly, as shown in FIG. 7, when a magnetic field A is applied in the horizontal direction of the magnetic visible recording medium 10, for example,
The plate-like magnetic fine particles 26 at the location where the magnetic field is applied are arranged in the horizontal direction. When light is irradiated from the outside of the magnetic visible recording medium 10 in this state, the long sides of the plate-like magnetic fine particles 26 are arranged in a state in which they are aligned in the horizontal direction.
The irradiation light is reflected or scattered by 6, and the display color of the magnetic visible recording medium 26 becomes the color of the plate-like magnetic fine particles 26 or its scattered light.

Further, as shown in FIG. 8, the magnetic visible recording medium 10 is used.
When a magnetic field is applied in the vertical direction of, the plate-like magnetic fine particles 26 at the location to which the magnetic field is applied similarly rotate, and the long sides are arranged in a state along the vertical direction.
Penetrates the microcapsule layer 23, reaches the support 22,
Since it is absorbed, scattered, or reflected on the surface, the color displayed on the magnetic visible recording medium 10 is black or the scattered light on the surface of the support or the surface color of the support.

Recording of a visible image on the magnetic visible recording medium 10 as described above is performed in advance by a horizontal magnetic field A over the entire magnetic visible recording portion.
Is applied to arrange the plate-like magnetic fine particles 26 in the horizontal direction,
A vertical magnetic field B is applied to the magnetic visible recording portion in accordance with the image to be recorded, and the long sides of the plate-like magnetic fine particles 26 corresponding to the image portion are rotationally moved in the vertical direction to change the arrangement. As a result, due to the difference in the arrangement of the plate-like magnetic fine particles 26 in the vertical direction and the horizontal direction, a color contrast on the surface of the magnetic visible recording medium 10 is generated and a visible image is formed.

As described above, the principle of recording on the magnetic visible recording medium is to change the arrangement direction of the plate-like magnetic fine particles by applying an external magnetic field in a specific direction to the magnetic visible recording medium to absorb, scatter, or reflect the irradiation light. An image that can be discriminated by, for example, is recorded.

However, in the magnetic visible recording medium having the above structure, the arrangement of the plate-like magnetic fine particles in the microcapsules is easily rotated by the application of the external magnetic field to show a new arrangement, so that the recording is performed as shown in FIG. A magnetic field other than the above, for example, an environmental magnetic field causes a rotational movement of a part of the plate-like magnetic fine particles 26, which causes a problem that an already recorded image is disturbed.

Therefore, in order to prevent the magnetic field from being affected by an external magnetic field other than the recording of the environmental magnetic field, the viscosity of the liquid contained in the microcapsules together with the plate-like magnetic particles is increased, and the plate-like magnetic particles are increased. The method was used to prevent the person from easily rotating.

Further, the visibility of the image is determined by the color of the plate-like magnetic fine particles and the support which constitute the magnetic visible recording medium, and conventionally the color of the image is limited.

[0011]

However, although suppressing the rotation of the plate-like magnetic fine particles in the microcapsules can eliminate the influence of a weak magnetic field such as an environmental magnetic field, the external magnetic field at the time of image recording. The responsiveness of the plate-like magnetic fine particles to the application of a magnetic field becomes poor, and the plate-like magnetic fine particles do not partially rotate, so that the resolution is low and a stable and clear recorded image cannot be obtained. In addition, since the arrangement of the plate-like magnetic fine particles becomes slow, there is a problem that the reactivity becomes slow. There has been no magnetic visible recording medium having both good recording reactivity and stable recorded image.

The visibility of the recorded image on the magnetic visible recording medium is determined by the color of the plate-like magnetic fine particles, the color of the lower layer of the microcapsule layer, or the color of the support. In order to change the color of the image, it was necessary to appropriately select and change the color of the plate-shaped magnetic fine particles, the color of the lower layer of the microcapsule layer, or the color of the support.

Therefore, in the present invention, the portion to which magnetism is applied is
An object of the present invention is to provide a reversibly displayable magnetic visible recording medium which is clear in contrast to the non-applied portion, has high resolution, is clear, and is excellent in image stability.

[0014]

The present invention has been made to achieve the above object, and the magnetic visible recording medium according to the invention of claim 1 is at least on a support made of a non-magnetic material. It is characterized in that a microcapsule containing plate-like or scale-like magnetic fine particles and a solvent, and a magnetic visible recording layer formed by dispersing and arranging a magnetic material in a binder are laminated with a protective layer. .

The magnetic visible recording medium according to the second aspect of the invention is characterized in that the coercive force of the magnetic material outside the microcapsules in the magnetic visible recording layer is 100 to 1000 Oe.

The magnetic visible recording medium according to the invention of claim 3 is characterized in that the surface of the magnetic material outside the microcapsules in the magnetic visible recording layer is covered with a metal thin film or a colored thin film.

The magnetic visible recording medium according to the invention of claim 4 is characterized in that a dye or a pigment is added to the binder in the magnetic visible recording layer.

The magnetic visible recording medium according to the present invention is characterized in that the coercive force of the magnetic material is higher than that of the magnetic fine particles.

[0019]

The magnetic visible recording medium of the present invention has a magnetic visible recording layer in which at least plate-like or scale-like magnetic fine particles and a microcapsule containing a solvent and a magnetic substance are dispersed and arranged in a binder to obtain magnetic properties. When an external magnetic field is applied to the visible recording medium, the plate-like or scale-like magnetic fine particles and the magnetic substance in the microcapsules are magnetized, and the plate-like or scale-like magnetic fine particles are arranged in the applied magnetic field direction to record an image. Even if the applied magnetic field deviates from the applied magnetic field, the residual magnetic field retained by the magnetic material maintains the alignment direction of the plate-like or scale-like magnetic fine particles and stabilizes the image.

The coercive force of the magnetic substance is 100 to 1000 O.
Since it is e, stability is given to the influence of the magnetic field applied from the time other than recording from the outside, and the influence on the recorded image (recording density, recording density, Resolution, bleeding, etc.) can be minimized.

Further, by adding a dye or pigment for coloring to the binder, the magnetic visible recording layer can be easily colored, so that an arbitrary color tone can be selected and the visibility of the magnetic visible recording medium is improved. .

[0022]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a cross-sectional view showing an embodiment of the magnetic visible recording medium of the present invention, and FIG. 2 is an explanatory view showing a non-recorded state by applying a horizontal magnetic field to the magnetic visible recording medium of the present invention, FIG. 3 is an explanatory diagram showing a state of the magnetic visible recording medium of the present invention during recording, FIG. 4 is an explanatory diagram showing a state of applying an environmental magnetic field to the magnetic visible recording medium of the present invention, and FIG. FIG. 7 is a front view of the magnetic visible recording medium of the present invention, FIG. 6 is a cross-sectional view of the conventional magnetic visible recording medium, and FIG. 7 shows an unrecorded state due to a horizontal magnetic field application operation of the conventional magnetic visible recording medium. FIG. 8 is an explanatory diagram showing a recording state of the conventional magnetic visible recording medium, and FIG.
FIG. 6 is an explanatory diagram showing a state in which an environmental magnetic field is applied to a conventional magnetic visible recording medium.

FIG. 1 shows a laminated structure of the magnetic visible recording medium 1 of the present invention, which comprises a support 11, microcapsules 14 containing plate-like or scale-like magnetic fine particles 15 and a solvent 16 and a magnetic substance 18. A magnetic visible recording layer 12 in which and are dispersedly arranged in a binder 17, and a protective layer 13 are further laminated. The magnetic visible recording medium 1 of the present invention may be further combined with a magnetic recording layer 19 as another recording means or an IC recording section provided with an IC chip having an electric recording means and a calculating means, which is not shown. It can be added to an IC card that performs non-contact communication such as an electromagnetic induction method or an electrostatic coupling method. FIG. 5 is a front view of the magnetic visible recording medium 1 of the present invention as seen from the front, in which the magnetic visible recording portion 2 is provided and a visible image 3 such as letters, numbers and marks is formed depending on the arrangement direction of the magnetic fine particles 15. It is formed.

The support 11 is made of strong paper, synthetic paper,
Made of vinyl chloride resin, vinyl acetate resin, polyethylene terephthalate resin, polyester resin, polycarbonate resin, polyurethane resin, acrylic resin, cellulose resin, or other plastics alone or a composite of these, or of metal or inorganic material (ceramics, etc.) Single,
Alternatively, these composites may be a composite with a plastic, and may be appropriately selected from the above materials in consideration of the physical properties required according to the use and purpose, such as strength, rigidity, hiding power, and light opacity. To be done. You may add additives, such as a dye, a pigment, and wax, to these. The shape of the support 11 can be appropriately selected depending on the application and purpose, such as a sheet shape, a card shape, and a film shape, and is not limited to these.

The magnetic visible recording layer 12 comprises microcapsules 14 containing plate-like or scale-like magnetic fine particles 15 and a solvent 16, a magnetic substance 18, and a binder 17 in which these are dispersed and arranged.

The plate-like or scale-like magnetic fine particles 15 are
A known magnetic material such as a magnetic metal or alloy, a metal compound (oxide or the like), for example, a metal such as Fe, Ni, Co, Cr or an alloy thereof, a metal compound can be used. As described above, the magnetic fine particles 15 preferably have a thin shape such that the long side is larger than the short side such as plate-like, scale-like, and columnar shape as described above, and the particle size is a thin layer of 5 to 60 μm. Is. The coercive force is 5 to 500O.
It is preferably e.

Further, the surface of the magnetic fine particles 15 is modified, for example, the surface of the magnetic fine particles 15 is smoothed, and other metals or their alloys, or inorganic metal substances, organic metal substances, inorganic substances are applied to the surface of the magnetic fine particles 15. The surface is formed by forming a coating film of a metal compound or an organometallic compound by a physical method such as vacuum deposition method, EB electron beam deposition method, or sputtering method or a chemical method such as CVD, plasma CVD, electrochemical deposition method, or chemical deposition method. It is also possible to apply an arbitrary color such as a metallic luster color or coloring.

The microcapsules 14 may be made of any of hydrophobic monomers, hydrophobic polymers or hydrophilic monomers, hydrophilic polymers, etc., depending on the method of preparation of the microcapsules. Methods include chemical preparation, physicochemical preparation, physical
A known method such as a mechanical preparation method can be used. For example, the chemical preparation method includes an interfacial polymerization method in which a monomer is supplied from both the inner phase and the outer phase of an emulsion in which magnetic particles are dispersed, and an emulsion in which magnetic particles are dispersed,
Alternatively, a monomer or a polymerization catalyst is supplied from either one of the outer phases to cover the surface of magnetic fine particles with a polymer in si.
There are a tu polymerization method, an in-liquid curing coating method in which a polymer is cured around a magnetic fine particle in a polymer solution with a curing agent for the polymer, and the physicochemical preparation method includes a coacervation method, an interfacial precipitation method, etc. There are a spray drying method and a melt dispersion cooling method as a physical / mechanical preparation method. Since the properties of the microcapsules produced by these preparation methods are different, they can be arbitrarily selected according to the purpose.

In the present invention, it is preferable to use the interfacial polymerization method, the coacervation method, and the interfacial precipitation method from the above methods. Particularly, the physical properties such as the particle size of the microcapsule and the film thickness, the characteristics of the magnetic substance, the physical properties of the solvent, From the yield of capsules, microencapsulation using an aqueous polymer by the coacervation method is preferable.

For example, water-soluble protein gelatin,
A polyanion colloid capable of forming a complex coacervate with this gelatin can be used. Examples of the polyanion colloid include gum arabic, sodium alginate, carboxymethyl cellulose, carrageenan and the like.

Further, in order to improve the durability of the microcapsule itself, the film of the microcapsule may be cured.

The solvent 16 which is the core substance forming the microcapsules 14 may be an inorganic or organic liquid having a certain viscosity, and it is preferable to use an oily liquid from the viewpoint of image recording performance and the method of preparing the microcapsules.

As the binder 17 for stabilizing the image by fixing and holding the microcapsules 14, there are generally water-soluble resins or emulsion resins, and for example, acrylic emulsion resins and urethane emulsion resins can be used.

A dye or a pigment can be used for coloring the magnetic visible recording layer. As the dye, a water-soluble dye is preferable from the properties of the encapsulated microcapsules and the properties of the binder in which the microcapsules are dispersed. For example, a soluble azo dye, anthraquinone dye, an indigoid dye, a soluble dye, a carbonium dye, and a phthalocyanine dye can be used. As the pigment, organic pigments and inorganic pigments can be used. For example, organic pigment-based pigments include insoluble azo pigments, copper phthalocyanine-based pigments, and inorganic pigment-based pigments such as chromates, oxides, sulfates, and silicates. , Carbonate, phosphate, etc.

The magnetic substance 18 is disposed in the binder 17 in order to stabilize the image recording by the orientation of the magnetic fine particles 15 in the microcapsule, and has magnetic needle-like or plate-like metal, alloy, metal. Made of oxides of
The coercive force is usually 100 to 1000 Oe. The magnetic substance 18 is preferably larger than the coercive force of the magnetic fine particles 15 in the microcapsule. As a result, after the image is recorded on the magnetic visible recording medium 1, even if the magnetic material 18 deviates from the applied magnetic field,
The residual magnetic field maintained at maintains the arrangement direction of the plate-like or scale-like magnetic fine particles 15, and makes it possible to stabilize the recorded image. The magnetic body 18 is preferably coated with a colored thin film on the surface of the magnetic body 18 so as not to affect the visual recognition of image recording due to the orientation of the magnetic fine particles 15. For example, the color of the support or the layer located underneath may be changed. It is desirable to make them similar or different from the color of the magnetic particles 15. The coloring of the magnetic body 18 is performed by vapor deposition of a metal thin film,
An inorganic colored film or an organic colored film can be provided on the surface of the magnetic body 18 by a dry coating method or a wet coating method.

The magnetic visible recording layer 12 is formed by a known printing method such as an offset printing method, a gravure printing method, a silk screen printing method, a coating method such as a roll coating method or a knife edge method, and the above-mentioned microcapsules. The transfer method using a transfer sheet having a transfer layer containing 14 and the ink jet method in which the ink containing the microcapsules 14 described above is sprayed on the base material, the microcapsules 14 described above are provided between the support 11 and the protective layer 13. It can be prepared by a forming method such as a method of filling the mixed solution, and can be appropriately selected from the above-mentioned methods according to the use and quantity of the information recording medium to be prepared.

Further, the protective layer 13 has a function of fixing and protecting the magnetic visible recording layer 12, and it is necessary that the protective layer 13 has transparency so that the magnetic fine particles 15 can be seen from the outside, and the strength and the physical properties of the magnetic fine particles 15 can be improved. An inorganic film or an organic film can be used as long as it satisfies the necessary conditions such as having chemical resistance. For example, SiO ₂ , A
An inorganic film such as l ₂ O ₃ or a simple substance such as polyester resin, acrylic resin, epoxy resin, polyurethane resin, acrylic polyol resin, polyethylene terephthalate resin, vinyl chloride resin, vinyl acetate resin or an organic film of a copolymer resin thereof. Can be used.

Further, in order to enhance the respective functions of the protective layer 13, various additives such as lubricants, waxes, abrasives, coloring dyes and pigments may be added to the extent that the function of the protective film itself is not deteriorated. It is possible.

Further, an adhesive layer 21 or a primer layer (not shown) may be provided between the magnetic visible recording layer 12 and the protective layer 13. The adhesive layer 21 or the primer layer (not shown) may be colored or colorless as long as it is transparent.

The magnetic recording layer 19 provided on the support 11 as required is usually formed by applying a mixed coating material comprising magnetic ferrite and a binder to the entire surface of the support 11 or a part thereof such as a stripe shape. A known magnetic material such as barium ferrite is used as the magnetic ferrite, and a vinyl chloride resin, a vinyl chloride-vinyl acetate resin copolymer, an epoxy resin, a polyurethane resin or the like is used as the binder. Alternatively, it may be formed by a method in which a magnetic tape prepared by applying these to a base material in advance is attached to the support 11. Further, an anchor layer 20 may be provided in order to improve the adhesion with the magnetic visible recording layer 12.

Next, an image recording method on the magnetic visible recording medium 1 of the present invention will be described. In recording on the magnetic visible recording medium 1 of the present invention, first, as shown in FIG. 2, the information recorded on the magnetic visible recording medium 1 is erased, that is, the orientation of the magnetic fine particles 15 is gathered in a certain direction. Then, the state is once unrecorded. In FIG. 2, a horizontal magnetic field A is applied to the entire magnetic visible recording portion 2, the plate-like magnetic fine particles 15 are arranged in the horizontal direction, and the orientation of the magnetic fine particles 15 in the magnetic visible recording portion 2 is fixed in the horizontal direction to be uniform. It has a color tone. As a result, the surface color of the magnetically visible recording portion 2 is kept constant, and the magnetic recording is not recorded.

As a means for concentrating the orientation of the magnetic fine particles 15 of the magnetic visible recording portion 2 of the magnetic visible recording medium 1 in a certain direction, although not shown, a magnetic head or a permanent magnet normally used for recording magnetic information is used. An external magnetic field can be applied by scanning the magnetic visible recording unit 2 with the above.

Recording on the magnetic visible recording portion 2 of the magnetic visible recording medium 1 is performed by applying a magnetism to a display position of information to be recorded by using a magnetic head as a writing means as shown in FIG. Thus, for example, when a vertical magnetic field B is applied in the vertical direction of the magnetic visible recording medium 1, the plate-like magnetic fine particles 15 in the portion to which the magnetic field is similarly applied are rotated, and the long sides are arranged in a state in which the long sides are along the vertical direction. Therefore, the irradiation light from the outside passes through the magnetic visible recording layer 12 and reaches the support 11,
Since it is absorbed, scattered or reflected on the surface, the color displayed on the magnetic visible recording medium 1 is black or the scattered light on the surface of the support or the surface color of the support. At the same time, the magnetic bodies 18 dispersedly arranged around the microcapsules are also magnetized.

In the magnetic visible recording medium 1 on which the visible information is recorded in this manner, a magnetic field having an intensity different from that of the external recording,
For example, FIG. 4 shows a state of the magnetic visible recording portion 2 when the magnetic visible recording medium 1 is exposed to a magnetic field having a magnetic intensity received in the environment.
As shown in FIG. 9, it can be seen that it is not affected by the external magnetic field even when compared with FIG. The arrangement direction of the magnetic fine particles 15 is maintained by the residual magnetic field held by the magnetic body 18,
This is because the image is stable.

The magnetic visible information thus obtained is
Once used, the screen is erased and the magnetically visible information is recorded again and can be reused.

Further, a more specific example of the magnetic visible recording medium of this embodiment will be described in detail. [Example 1] A magnetic paint having the following composition was applied on a black polyethylene terephthalate film having a thickness of 50 µm with a gravure coater to about 20 parts.
It is applied to a thickness of μm to form a black magnetic recording layer.
After applying a magnetic field orientation in a 0 Gauss horizontal magnetic field, 100
It was dried with hot air at ℃ for about 3 minutes. (Composition of magnetic paint) Magnetic powder (1750 Oe, barium ferrite) 100 parts Vinyl chloride-vinyl acetate copolymer (VAGF: Union Carbide Co.) 20 parts Polyurethane resin (Nipporan 2304: Nippon Polyurethane Co.) 30 parts Hexamethylene diisocyanate (Coronate HX: manufactured by Nippon Polyurethane Co., Ltd.) 2 parts Carbon black (# 3000: manufactured by Mitsubishi Kasei) 5 parts Dispersant (Garfuck RE-610: manufactured by Toho Chemical Co., Ltd.) 3 parts Diluent Toluene / MEK / MIBK 100 parts

On the magnetic recording layer of the support coated with this magnetic recording layer, an anchor coating having the following composition was applied to a thickness of 5 μm by a gravure coater to form an anchor layer, and the temperature was set to 100 ° C.
Was dried with hot air for 2 minutes. (Composition of anchor paint) Polyester (Vylon 200: Toyobo Co., Ltd.) 100 parts Hexamethyldiisocyanate (Coronate HX: Nippon Polyurethane Co., Ltd.) 10 parts Diluent Toluene / MEK / MIBK 200 parts

Microcapsules of the magnetic visible recording layer were prepared from gelatin and gum arabic by coacervation with the following composition. (A) A thin plate-like magnetic fine particle, Ni / Fe alloy, was dispersed in olive oil to obtain a core material of a microcapsule. (A) The core substance was mixed with an aqueous gelatin solution, and an aqueous solution of gum arabic was further added and well stirred. (C) While maintaining the mixed solution at 40 ° C., pure solution and acetic acid at 40 ° C. were added to dilute the solution, and PH was adjusted to 4 to 5 to cause complex coacervate. (D) Coacervated mixture The liquid was cooled to 10 ° C., formalin was added, and the capsule was cured to obtain a microcapsule. (Composition of microcapsules) Plate-shaped magnetic fine particles (Fe / Ni alloy) 8 parts Olive oil 10 parts Gelatin 10 parts Arabic gum 10 parts Pure water 300 parts Formalin 5.5 parts Acetic acid Small amount

Then, acicular crystal magnetite (coercive force 650 Oe) was used as a magnetic substance for image stabilization, an Al film was formed on the surface by vapor deposition, and this was added to an emulsion binder and well stirred and dispersed. The above-mentioned microcapsules were added to the dispersion system and stirred to obtain a coating material for the microcapsule layer.

A coating material for the microcapsule layer having the following composition was applied on the anchor layer of the support by a coater so that the dry film thickness was 200 μm, and dried with hot air at 100 ° C. (Paint for microcapsule layer) Microcapsule 50 parts Magnetite 5 parts Emulsion binder 150 parts Pure water 150 parts

Further, a thickness of 20 μ is formed on the microcapsule layer.
m of acrylic pressure-sensitive adhesive layer was applied by a coater, and a transparent polyethylene terephthalate film having a thickness of 50 μm was further adhered to obtain a magnetic visible recording medium according to the present invention.

In the magnetic visible recording medium obtained in Example 1, 1
When an external magnetic field of 000 Gauss was applied and visible information was recorded, an image could be recorded. When the reflection density of these images was measured using a Macbeth reflection densitometer (RD918), a reflection density of ΔOD = 0.7 was obtained, and the images could be read sufficiently. Furthermore, when an external magnetic field of 30 Gauss was applied to the image of the magnetic visible recording medium to confirm the image disturbance, the recorded image was not disturbed.

According to the magnetic visible recording medium of the present invention, by adding a magnetic substance having a coercive force of 100 to 1000 Oe, the stability of the recorded image against the environmental magnetic field is increased, and further, a metal thin film is formed on the surface of the magnetic substance. Alternatively, by forming an organic or inorganic colored thin film, it is possible to prevent a decrease in recording density and resolution due to the addition of a magnetic material.

[Example 2] A yellow azo dye, which is a water-soluble dye, was added to the emulsion binder as a colorant in the coating material for the microcapsule layer of Example 1 to prepare a coating material for the microcapsule layer having the following composition. It is coated on the anchor layer of the support by a coater so that the dry film thickness is 200 μm, and then 100
It was dried with hot air at ℃. (Paint for microcapsule layer) Microcapsule 50 parts Magnetite 5 parts Dye 5 parts Emulsion binder 150 parts Pure water 150 parts

[Example 3] A TiO ₂ white pigment was added to the emulsion binder as a colorant to the coating material for the microcapsule layer of Example 1 to prepare a coating material for the microcapsule layer having the following composition. Dry film thickness of 200μm on anchor layer of support
Was coated with a coater so as to obtain the following, and dried with hot air at 100 ° C. (Paint for microcapsule layer) Microcapsule 50 parts Magnetite 5 parts TiO ₂ white pigment 5 parts Emulsion binder 150 parts Pure water 150 parts

When an external magnetic field of 1000 gauss was applied to the magnetic visible recording media of Examples 1 to 3 to record visible information, images could be recorded on all the samples. Macbeth reflection densitometer (RD9
18) was used to measure the reflection density, and the visibility of the image was visually determined. The results are shown in Table 1.

[0057]

[Table 1]

The magnetic visible recording medium of the present invention was able to obtain a clear and excellent image by adding a coloring dye or coloring pigment to the binder of the magnetic visible recording layer.

[0059]

The magnetic visible recording medium of the present invention comprises a magnetic visible recording layer in which at least plate-like or scale-like magnetic fine particles and microcapsules containing a solvent are dispersed in a binder. When an external magnetic field is applied to the magnetic visible recording medium, the plate-like or scale-like magnetic fine particles and the magnetic substance in the microcapsules are magnetized, and the plate-like or scale-like magnetic fine particles are arranged in the applied magnetic field direction,
The image is recorded. Even if the applied magnetic field deviates from the applied magnetic field, the residual magnetic field retained by the magnetic material maintains the alignment direction of the plate-like or scale-like magnetic fine particles and stabilizes the image. Therefore, the portion to which magnetism is applied is distinctly different from the portion to which no magnetism is applied, and has a high resolution, is clear, and has excellent effects such as excellent image stability.

The coercive force of the magnetic material is 100 to 1000 O.
Since it is e, stability is given to the influence of the magnetic field applied from the time other than recording from the outside, and the influence on the recorded image (recording density, recording density, Resolution, bleeding, etc.) can be minimized.

Further, by adding a dye or pigment for coloring to the binder, the magnetic visible recording layer can be easily colored, so that an arbitrary color tone can be selected and the visibility of the magnetic visible recording medium is improved. .

Further, since the step of applying the coating liquid containing the microcapsules can be applied, the manufacturing steps of the magnetic visible recording medium can be simplified.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of a magnetic visible recording medium of the present invention.

FIG. 2 is an explanatory diagram showing a non-recorded state by applying a horizontal magnetic field to the magnetic visible recording medium of the present invention.

FIG. 3 is an explanatory diagram showing a recording state of the magnetic visible recording medium of the present invention.

FIG. 4 is an explanatory diagram showing a state in which an environmental magnetic field is applied to the magnetic visible recording medium of the present invention.

FIG. 5 is a front view of the magnetic visible recording medium of the present invention.

FIG. 6 is a sectional view of a conventional magnetic visible recording medium.

FIG. 7 is an explanatory diagram showing a non-recorded state by a horizontal magnetic field applying operation of a conventional magnetic visible recording medium.

FIG. 8 is an explanatory diagram showing a recording state of a conventional magnetic visible recording medium.

FIG. 9 is an explanatory diagram showing a state in which an environmental magnetic field is applied to a conventional magnetic visible recording medium.

[Explanation of symbols]

 1, 10 Magnetic Visible Recording Medium 2 Magnetic Visible Recording Part 3 Visible Image 11, 22 Support 12 Magnetic Visible Recording Layer 23 Microcapsule Layer 13, 24 Protective Layer 14, 25 Microcapsule 15 Magnetic Fine Particles 26 Plate-like Magnetic Fine Particles 16 Solvent 27 Hydrophobic liquid 17,29 Binder 18 Magnetic substance 19,30 Magnetic recording layer 20,31 Anchor layer 21,32 Adhesive layer

Claims (5)

[Claims] 1. A magnetic visible recording layer comprising a support made of a non-magnetic material and microcapsules containing at least plate-like or scale-like magnetic fine particles and a solvent and a magnetic substance dispersed in a binder. A magnetic visible recording medium comprising a protective layer laminated. 2. The magnetic visible recording medium according to claim 1, wherein the magnetic substance outside the microcapsules in the magnetic visible recording layer has a coercive force of 100 to 1000 Oe. 3. The magnetic visible recording medium according to claim 1, wherein the surface of the magnetic material outside the microcapsules in the magnetic visible recording layer is coated with a metal thin film or a colored thin film. 4. The magnetic visible recording medium according to claim 1, wherein a dye or a pigment is added to the binder in the magnetic visible recording layer. 5. The magnetic visible recording medium according to claim 1, wherein the magnetic substance has a coercive force higher than that of the magnetic fine particles.