JP2003228812A - Laminated magnetic recording medium and magnetic passbook - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a laminated magnetic recording medium which has a clear coloring layer while satisfying various requested qualities such as resolution regarding the bonded magnetic recording medium in which a hiding layer and a coloring layer are laminated on a magnetic recording layer, and a highly esthetic magnetic passbook by using the same. <P>SOLUTION: This laminated magnetic recording medium is constituted by using a particular metal thin-film small piece having good planar orientation and a binding resin to prepare a coating material for a hiding layer, coating the material on a magnetic recording layer to form the hiding layer as a hardenening film, and laminating a coloring layer thereon. The magnetic passbook is constituted by using the bonded magnetic recording medium. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sticking type magnetic recording medium having a clear color on its surface and a magnetic passbook produced by using the sticking type magnetic recording medium. The present invention relates to a technique for improving a hiding layer, which is a constituent layer of a recording medium.

The pasted magnetic recording medium of the present invention is
A magnetic recording layer, a concealing layer, and a colored layer are provided on one surface of the non-magnetic support, and an adhesive layer is provided on the opposite surface with the non-magnetic support sandwiched therebetween, and a release paper is provided so as to contact the adhesive layer. When the magnetic passbook is manufactured, the release paper is peeled off and the adhesive layer and the passbook base are attached so as to be in contact with each other. The form of the sticking type magnetic recording medium may be a roll form, a sheet form, a label form,
There are various forms such as a tape form and a label tape form in which a label-like sticking type magnetic recording medium is located at equal intervals on a tape-like release paper. A release paper may be omitted by providing the colored layer with releasability so that the pressure-sensitive adhesive layer is wound so as to come into contact with the colored layer.

[0003]

2. Description of the Related Art Magnetic passbooks used for bank passbooks, postal savings passbooks, etc. are generally in the form of paper booklets,
A magnetic recording layer is formed on a part or the whole of one side or both sides of the front cover or the rear cover of the booklet. Such a magnetic recording layer is produced by a bonding type magnetic recording medium in which a magnetic recording layer is provided on one surface and a pressure-sensitive adhesive layer is provided on the other surface with a non-magnetic support interposed therebetween. For example, processed into a predetermined shape,
The magnetic recording layer is formed on the surface of the pasting-type magnetic recording medium by adhering it onto the passbook substrate under pressure and heating.

Therefore, it is inevitable that the magnetic recording layer is directly exposed on the passbook surface, and a dark shade of black or brown of the magnetic recording layer appears on the passbook surface, resulting in deterioration of aesthetics of the magnetic passbook. Came.

As a means for solving such a problem, a method of providing a colored layer on the magnetic recording layer of a magnetic passbook is used. Usually, this colored layer is provided by being laminated in advance on the magnetic recording layer in the sticking type magnetic recording medium and being attached to the passbook substrate at the same time as the magnetic recording layer.

In the magnetic passbook manufactured in this manner, the coloring of the colored layer appears on the passbook surface,
The aesthetics of the magnetic passbook are better than those of the magnetic passbook prepared by the laminated magnetic recording medium having no colored layer.
Ideally, the colored layer should be colored any color. However, the colored layer needs to contain a pigment for hiding the color of the magnetic recording layer, and a pigment or dye for coloring, and in order to effectively hide the color of the magnetic recording layer, a hiding pigment When the compounding amount of (1) is increased, the compounding amount of the pigment or dye for coloring is relatively decreased, and it becomes impossible to apply vivid coloring. Further, when the blending amount of the pigment or dye for coloring is increased in order to improve the color development of the coloring layer, the addition amount of the hiding pigment is relatively decreased, and the color of the magnetic recording layer can be hidden. As a result, the color of the magnetic stripe (the magnetic recording layer portion described later) is inevitably dark and has a dirty hue.

Further, the hiding property of the colored layer is improved, and
If the thickness of the colored layer is increased in order to make the hue clear, the reproduction output, which is a characteristic of the magnetic recording medium, will be reduced. This is for the following reason. The reproduction of the magnetic signal is performed by detecting the magnetic flux leaking from the magnetic recording layer with a magnetic head. The magnetic field strength of the magnetic flux leak becomes wider as the distance from the magnetic recording layer increases, and the magnetic field strength becomes weaker. Become. That is, the reproduction output decreases as the distance between the magnetic head and the magnetic recording layer increases. Therefore, even if the magnetic recording layers are exactly the same, the reproduction output changes depending on the distance between the magnetic recording layer and the magnetic head, and the reproduction output decreases as the distance increases. The colored layer provided on the magnetic recording layer is a so-called non-magnetic layer that does not participate in magnetic recording at all, and the presence of this colored layer determines the distance between the magnetic head and the magnetic recording layer from the viewpoint of magnetic recording. This is a factor that causes a loss in playback output due to the large size. Such output loss is called "spacing loss".
Since the spacing loss appears more strongly in the short wavelength recording area, another important characteristic of the magnetic recording medium is the ratio of the reproduction output in the long wavelength recording area to the reproduction output in the short wavelength recording area, that is, the so-called “resolution”. It decreases according to the distance between the magnetic head and the magnetic recording layer. The decrease in reproduction output due to spacing loss is compensated by increasing the thickness of the magnetic recording layer. The reproduction output depends on the magnetic field strength of the leakage magnetic flux on the surface of the medium, that is, the number of effective magnetic fluxes on the surface of the magnetic recording medium that crosses the head, and the number of effective magnetic fluxes crosses a plane perpendicular to the magnetic recording direction in the magnetic recording layer. It depends on the number of residual magnetic flux. Therefore, when the film thickness of the magnetic recording layer is increased, the number of residual magnetic fluxes increases, and their contribution to the medium surface also increases, so that the number of effective magnetic fluxes on the surface of the magnetic recording medium also increases and the reproduction output increases. However, "resolution"
Is defined by the ratio of the reproduction output in the long wavelength recording area and the reproduction output in the short wavelength recording area, so it cannot be improved by increasing the number of effective magnetic fluxes on the medium surface. It is further reduced by a phenomenon called "medium thickness loss" caused by an increase in film thickness. Therefore,
The above method of increasing the film thickness of the magnetic recording layer according to the thickness of the non-magnetic layer cannot essentially compensate for the decrease in "resolution". It is naturally restricted.

The magnetic passbook or the stick-on magnetic recording medium does not have an official standard such as a plastic magnetic card, but has the same recording density, recording method, reliability and durability as those of the magnetic card. Therefore, performance equivalent to that of JIS X 6302 “Identification card with magnetic stripe” is required. In particular, regarding "resolution", the passbook base is softer than the plastic magnetic card and there are many irregularities on the surface, and as a result, the surface of the sticking type magnetic recording medium is also affected by the irregularities Therefore, stricter performance is required.

Here, the resolution means 20 magnetic flux reversal / mm.
The average peak output voltage of the reproduction output signal at a recording density of {500 magnetic flux reversal / inch (abbreviated as 500 bpi)} and 8 magnetic flux reversal / mm {200 magnetic flux reversal / inch (20
0 bpi)}) and the average peak output voltage of the reproduction output signal at the recording density.

Therefore, in order to reduce the spacing loss due to the colored layer as much as possible, there is also proposed a sticking type magnetic recording medium in which a nonmagnetic concealing layer is provided between the colored layer and the magnetic recording layer. This is a functionally separated layer for concealing the dark hue of the magnetic recording layer and a layer for coloring, and since the composition of the layer can be optimized according to each required characteristic, only the colored layer Hides the hue of the magnetic recording layer with, and
It is possible to suppress the total thickness of the non-magnetic layer and reduce the spacing loss as compared with the case where coloring is also performed.

Japanese Unexamined Patent Publication (Kokai) No. 53-118104 discloses a laminated magnetic recording medium using a metal vapor deposition film layer as a masking layer. Since the metal vapor deposition film layer exhibits a good hiding property even with an extremely thin film thickness, it is possible to hide the dark shade of the magnetic recording layer without increasing the spacing loss. However, since the metal vapor deposition film layer contains no resin component at all, the interlayer adhesion between the magnetic recording layer and the metal vapor deposition film layer and between the metal vapor deposition film layer and the coloring layer is often insufficient. In this case, it is necessary to provide an anchor layer containing a binder resin as a main component between the magnetic recording layer and the metal vapor deposition film layer and between the metal vapor deposition film layer and the coloring layer. This leads to an increase in defects due to an increase in the number of steps and an increase in production cost, and thus the bonded magnetic recording medium using the metal vapor deposition film layer has a problem of high cost. Further, since the metal vapor deposition film layer is easily oxidized, the weather resistance preservation property of the obtained bonded magnetic recording medium and the magnetic passbook produced by using this bonded magnetic recording medium is the same as that of the metal deposited film layer. There is also a problem that it is worse than the bonded type magnetic recording medium and the magnetic passbook which are not provided.

On the other hand, an inorganic pigment, a metal powder,
A method using a layer in which a filler such as a metal oxide powder is mixed and dispersed in a binder resin is also known. In this method, the hiding layer is obtained by applying or printing a hiding layer coating material comprising a filler, a binder resin and a solvent, and the manufacturing cost is relatively low. Further, since the concealing layer contains a binder resin, interlayer adhesion with the magnetic recording layer and the coloring layer is good, and it is not necessary to provide an anchor layer. Also,
Even when a metal powder is used as the filler, the surface of the metal powder is coated with a binder resin, so that the weather resistance of the bonded magnetic recording medium and the magnetic passbook is also comparable to that using the metal vapor deposition film layer. And become good. However, this type of hiding layer usually has a spherical or granular filler for hiding the color of the lower layer, so its hiding power is low, and its film thickness is increased to obtain a satisfactory hiding property. There was a need. Further, even when a plate-like filler was used, its orientation was low and the hiding power was not at a satisfactory level. Therefore, it is still difficult to achieve both the recording / reproducing characteristics and the clear coloring. That is, an object of the present invention is to provide a pasting type magnetic recording medium in which a concealing layer and a coloring layer are laminated in this order on a magnetic recording layer while satisfying various required qualities in recording and reproducing characteristics represented by resolution and the like. The present invention provides a sticking type magnetic recording medium having a colored layer to which a vivid color is imparted by having a concealing layer capable of completely concealing the dark color of the underlying magnetic recording layer, and a magnetic recording layer portion thereof. It is to provide a magnetic passbook with excellent aesthetics.

[0013]

Means for Solving the Problems As a result of intensive studies made by the present inventors in view of the above circumstances, as a filler, instead of a conventional filler, which was difficult to exert a sufficient hiding power, as a binder A hiding layer having a high hiding power can be obtained by dispersing it in a resin to form a coating, and by using a specific filler having excellent planar orientation in the coating when the coating is applied. The inventors have found that the above-mentioned problems can be achieved by the formation, and have completed the present invention. here,
Planar orientation means that the filler itself is flat, and
Refers to the property of forming a plane parallel to the coating surface when it is immobilized in the coating.

That is, according to the present invention, the magnetic recording layer, the concealing layer and the coloring layer are laminated in this order on one surface of the non-magnetic support from the side closer to the non-magnetic support, and the non-magnetic support is sandwiched on the opposite side. A sticking type magnetic recording medium having an adhesive layer on its surface, wherein the concealing layer contains a binder resin and a thin metal film strip.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION A schematic view of a magnetic passbook which is an example of an embodiment of the present invention is shown in FIG. 1, a cross-sectional view of a sticking type magnetic recording medium is shown in FIG. FIG. 3 shows a cross-sectional view of the magnetic recording layer portion of the magnetic passbook formed by using the above. Each component will be described in detail with reference to these drawings.

The passbook base 1 is, for example, a magnetic passbook cloth paper having a cloth cloth as a base cloth and a resin coated surface. A magnetic recording layer portion 2 is formed on one or both of the front cover and the rear cover or a part or the entire surface of the passbook substrate 1 as the cover of the booklet. The magnetic recording layer portion 2 is a laminated body including a magnetic recording layer, a concealing layer and a coloring layer which are essential constituent layers in the magnetic recording medium of the present invention.

Next, each constituent material of the sticking type magnetic recording medium of the present invention will be described in detail. The laminated magnetic recording medium is
As shown in FIG. 2, the magnetic recording layer 4, the hiding layer 5, and the coloring layer 6 are formed on one surface of the non-magnetic support 3, and the adhesive layer 7 is provided on the other surface. A release paper 8 or the like is usually attached on the adhesive layer 7. Usually, such a laminated magnetic recording medium is obtained by forming each constituent layer on a raw material of a film-shaped non-magnetic support by a coating method. Thereafter, the original sheet is cut into a sheet shape, or a label-like magnetic recording medium is prepared by punching from the original sheet or sheet. Further, a tape-shaped bonded magnetic recording medium can be prepared by slitting a material or a sheet. When pasting the sticking type magnetic recording medium to the passbook substrate, if there is a release paper, the release paper is peeled off, and then the laminated structure including the magnetic recording layer is applied to the passbook substrate 1. Then, they are superposed on each other via the pressure-sensitive adhesive layer 7, and pressure and heat are applied to adhere them to the passbook substrate.

Any known non-magnetic support can be used for the laminating type magnetic recording medium. Examples thereof include polyesters such as polyethylene terephthalate, polyolefins such as polypropylene, cellulose derivatives such as cellulose triacetate, and plastics such as polyamide. Among them, polyethylene terephthalate and the like having both tensile strength and heat resistance are preferable. The thickness of the non-magnetic support is not particularly limited, but usually 1
It is 0 to 100 μm, preferably 20 to 80 μm.

As the binder resin for the magnetic paint used in the laminating type magnetic recording medium, it is possible to widely use any resin for general paint. For example, butyral resin, vinyl chloride-vinyl acetate copolymer resin, urethane resin, polyester resin, cellulosic resin, acrylic resin, styrene-maleic acid copolymer resin and the like, particularly chloride containing a sulfonic acid metal base. The vinyl resin is particularly desirable because it has excellent dispersibility of the magnetic material. Further, an isocyanate compound may be used for heat curing.
Further, in the dispersion obtained by dispersing the magnetic powder in the resin, if necessary, a surfactant, a silane coupling agent, a plasticizer, a wax, auxiliary agents such as silicone oil,
Furthermore, carbon black and other fillers may be added.

Here, the magnetic powder used in the present invention includes:
γ-Fe2O3, Co deposition γ-Fe2O3, Fe3O
4, Co-deposited Fe3O4, CrO2, Ba ferrite,
Conventionally known magnetic powders such as Sr ferrite, Pb ferrite and Ca ferrite can be used.

Examples of the solvent used in the magnetic paint of the present invention include ketone solvents such as acetone, methyl ethyl ketone and cyclohexanone, ester solvents such as methyl acetate, alcohol solvents such as ethanol, hydrocarbons such as toluene and tetrahydrofuran. And the like, such as ether solvents, and these solvents can be used as a mixture of two or more kinds.

The coating liquid for the magnetic recording layer can be obtained, for example, by kneading and dispersing the above-mentioned magnetic powder, binder resin, organic solvent and, if necessary, other components with a kneading disperser. In this kneading / dispersion, various kneading / dispersing machines can be used, for example, a two-roll mill, a three-roll mill, a ball mill, a Henschel mixer, a sand mill, a disper, a high speed mixer, a homogenizer, an open kneader, a continuous kneader, pressurization. Examples include a kneader.

A magnetic recording medium for a passbook is recorded at a longer wavelength than a magnetic recording medium such as an audio tape or a video tape. Therefore, its output is substantially proportional to the amount of magnetization of the magnetic powder used or the thickness of the magnetic recording layer.
It is necessary to increase the thickness of the magnetic recording layer in order to ensure data stability and support high output. Therefore, the thickness of the magnetic recording layer is preferably in the range of more than 5 μm and 100 μm or less. If the thickness of the magnetic recording layer is 5 μm or less, the output is insufficient as a magnetic recording medium for passbooks, which is not preferable.
On the other hand, when it is 100 μm or more, the resolution of the reproduction output is lowered, which is not preferable. The more preferable range is 20μ beyond 5μm.
m or less. The coating method of the magnetic recording layer is not particularly limited, and a known coating method may be used, and the magnetic recording layer can be manufactured according to the method used for manufacturing a magnetic recording medium having a single-layer or multi-layer structure. For example, a gravure method, a reverse method, an air doctor coater method, a blade coater method, an air knife coater method, a die method or the like can be used. As the orientation method, a known method, for example, a repulsive opposed permanent magnet or a solenoid type electromagnet can be used. The magnetic field strength is preferably in the range of 1000 to 6000G.

In the present invention, the hiding layer contains a binder resin and a metal thin film strip as essential components, and this layer contains a hiding coating composition comprising a binder resin, a metal thin film strip and a solvent, which is a known and commonly used coating method. It can be obtained by applying or printing by a printing method. The concealing paint may further contain additives and curing agents. Conventionally, a metal powder prepared by a ball mill or the like is used as the plate-like filler used in the hiding layer, but in the present invention, a specific metal thin film strip is used, and this metal thin film strip is the object to be coated. As a result of being highly oriented in the direction parallel to the surface, a high hiding property which cannot be obtained by the conventional plate-like filler can be obtained.

Aluminum, gold, silver, copper, brass, titanium, chrome, nickel, nickel chrome, stainless steel and the like can be used as the metal of the metal thin film strip.
As a method of forming a metal into a thin film, in the case of a metal having a low melting point such as aluminum, vapor deposition, aluminum, gold, silver,
Examples of the material include foil when it has malleability such as copper, and sputtering and the like when metal having a high melting point and no malleability. The thickness of the metal thin film is preferably 0.01 to 0.1 μm, more preferably 0.03 to 0.08 μm.
The size in the plane direction of the metal thin film pieces dispersed in the coating material for the hiding layer is preferably 5 to 25 μm, more preferably 1
It is 0 to 15 μm. If the size is less than 5 μm, the brightness of the coating film becomes insufficient and the hiding layer itself has a dark color tone. On the other hand, if it exceeds 25 μm, the thin metal film pieces are less likely to be oriented, so that the hiding property is deteriorated.

A method for producing a metal thin film piece and a metal thin film strip obtained by further processing and preparing the metal thin film piece will be described below by using an example in which a vapor deposition method is adopted as a method for preparing the metal thin film piece. A polyolefin film, a polyester film, or the like can be used as the base material film on which the metal is deposited. First, a release agent layer is provided on a base film by coating, and then a metal is vapor-deposited on the release agent layer so as to have a predetermined thickness. A top coat layer is applied to the surface of the deposited film to prevent oxidation. The same coating agent for forming the release agent layer and the top coat layer can be used.

The resin used for the release agent layer or the top coat layer is not particularly limited. Specifically, for example,
Examples thereof include cellulose resin, acrylic resin, vinyl resin, polyamide resin, polyester resin, EVA resin, chlorinated polypropylene resin, chlorinated EVA resin and petroleum resin. As the solvent, aromatic hydrocarbons such as toluene and xylene, aliphatic or alicyclic hydrocarbons such as n-hexane and cyclohexane, ethyl acetate,
Esters such as propyl acetate, alcohols such as methanol, ethanol and isopropyl alcohol, ketones such as acetone and methyl ethyl ketone, and alkylene glycol monoalkyl ethers such as ethylene glycol monoethyl ether and propylene glycol monomethyl ether can be used. .

The above metal vapor deposition film is immersed in a solvent that dissolves the release agent layer and the top coat layer and stirred, and the metal vapor deposition film is peeled from the substrate film and then further stirred to increase the size of the metal thin film piece. The thickness is adjusted to about 150 μm, filtered and dried. The solvent is not particularly limited except that it dissolves the resin used in the release agent layer or the top coat layer. Even when the metal thin film is formed by sputtering, the metal thin film piece can be formed by the same method as described above. When a metal foil is used, it may be ground in a solvent as it is with a stirrer to a predetermined size.

The metal thin film piece is preferably surface-treated in order to enhance the dispersibility in the masking layer coating material. As the surface treatment agent, stearic acid, oleic acid, organic fatty acids such as palmitic acid, methylsilyl isocyanate, nitrocellulose, cellulose acetate propionate,
Cellulose acetate butyrate, cellulose derivatives such as ethyl cellulose, and the like, are adsorbed on the surface of the metal thin film piece by a known and commonly used method.

The method for preparing the coating material for the masking layer will be described below. As the binder resin, those commonly used in conventional paints, gravure inks, flexo inks, screen inks and the like can be used. Specifically, for example, the binder resin described in the magnetic recording layer can be used.

In the hiding paint used in the present invention, various additives used in conventional paints, gravure inks, flexo inks, screen inks and the like can be used if necessary. Examples of such additives include coloring pigments, dyes, waxes, plasticizers, leveling agents, surfactants, dispersants, defoamers and the like.

The hiding layer coating material used in the present invention is a conventional coating material, gravure ink, flexo ink, screen ink or the like for the purpose of improving various resistance such as heat resistance and solvent resistance of the hiding layer to be formed. Various curing agents used in the above can be used. Examples of such curing agents include titanium / aluminum / zinc based metal chelating agents, silane / titanium based coupling agents, isocyanate based curing agents, epoxy based curing agents, ethyleneimine based curing agents, and the like. .

The solvent used in the coating material for the masking layer in the present invention may also be a known and commonly used solvent used in conventional coating materials, gravure inks, flexo inks, screen inks and the like.

Generally, in order to stably disperse the raw materials for the coating composition, the pigment and other additives are finely divided into submicrons by kneading with a roll mill, a ball mill, a bead mill, a sand mill or the like. But,
In the coating material for a hiding layer of the present invention, the metal thin film flakes to be blended in order to exhibit a good hiding property need to have a size of 5 to 25 μm, and when the above-mentioned kneading is performed, the metal thin film flakes are fine particles. As a result, the brightness peculiar to the metal thin film strips decreases, and the hiding layer itself becomes a dark shade. Therefore, in the present invention, the hiding layer is not used, and the coating materials for the hiding layer are simply prepared by mixing and stirring the above-mentioned blended raw materials. For that purpose, it is preferable to surface-treat the metal thin film strip as described above for the purpose of improving the dispersibility.

The coating or printing method of the coating material for the hiding layer may be a conventional coating method such as roll coating, gravure coating, curtain coating, spray coating, die coating, or the like.
And a printing method such as gravure printing, flexographic printing, or screen printing can be used.

From the viewpoint of hiding the color of the magnetic recording layer, the dry film thickness of the hiding layer is preferably thicker, and in terms of the recording / reproducing characteristics, the thinner it is. In consideration of these balances, the film thickness is preferably 0.1 to 1 μm, and particularly preferably 0.3 to 0.8 μm. When it is thinner than 0.1 μm, the hiding property of the hiding layer is deteriorated, and the color of the magnetic recording layer cannot be completely covered, and when it is thicker than 1 μm, the hiding property is not improved. However, it is not preferable because it causes deterioration of recording and reproducing characteristics.

The colored layer in the present invention contains a binder resin and a colorant as essential components. Specifically, a coloring agent such as a pigment or a dye is singly or in a mixture of two or more kinds in a binder resin and a solvent that dissolves the binder resin, and a two-roll mill, a three-roll mill, a ball mill, a sand mill, a disper, etc. To obtain a colored layer coating material, which is applied by a known and commonly used method such as a reverse method, a gravure coating method, a die coating method or the like to obtain a colored layer.

The pigments used in the colored layer include inorganic pigments such as alumina, titanium oxide, chromium oxide, iron oxide, zinc oxide and barium sulfate, and organic pigments include azo pigments.
There are many types such as phthalocyanine type, quinacridone type, perylene type, anthraquinone type, thioindigo type, and indanthrene type, but they are not particularly limited. Further, instead of or in combination with the above pigments, dyes such as phthalocyanine dyes, azo dyes, nitro dyes, quinoline dyes, methine dyes, azine dyes, and fatalein dyes can be used.

As the binder resin used in the coating material for the colored layer, known and commonly used binder resins can be used. For example, the binder resin described for the magnetic recording layer may be used. It is also possible to heat cure using an isocyanate compound.
As the solvent used for the coating material for the colored layer, a known and commonly used solvent can be used, for example, the solvent already mentioned in the magnetic recording layer can be used.

The colored layer is located closer to the surface layer than the magnetic recording layer. Therefore, if the thickness of the colored layer is too large, the spacing becomes large, the output loss increases, and the recording / reproducing characteristics required for the magnetic recording medium cannot be maintained. Therefore, it is necessary to increase the film thickness of the magnetic recording layer to compensate for the reduction in reproduction output. Regarding the resolution, which is another important characteristic of magnetic recording, the larger the spacing, the more Since the thickness of the magnetic recording layer decreases as it increases, there is a limit to increasing the thickness of the magnetic recording layer. Further, the colored layer cannot be made too thin due to its coloring property, and taking these into consideration, the film thickness is preferably 0.3 to 5 μm, and particularly preferably 0.5 to 2.5 μm.

When the sticking type magnetic recording medium is adhered to the passbook substrate, the pressure-sensitive adhesive layer 7 of the sticking type magnetic recording medium is pressure-bonded to a predetermined position of the passbook substrate at room temperature and then at about 120 ° C. It is heated at a temperature and pressed to strengthen the bond. Therefore, it is desirable that the pressure-sensitive adhesive layer 7 is a pressure-sensitive pressure-sensitive adhesive having excellent adhesive force both at room temperature pressure bonding and after heat and pressure.

The resin used for the pressure-sensitive adhesive layer 7 is, for example, a copolymer of alkyl acrylate and (meth) acrylic acid, or alkyl acrylate and (meth).
A vinyl chloride resin such as a copolymer of acrylic acid and vinyl acetate, a copolymer of vinyl chloride and vinyl acetate, or a copolymer obtained by further adding vinyl alcohol, maleic anhydride or acrylic acid, a polyester resin, An acrylic resin, a polyimide resin, a polyurethane resin, a phenol resin, etc. can be mentioned. Further, by adding a cross-linking agent to the resin composition, it is possible to control the adhesive strength at room temperature pressure bonding and the adhesive strength after heating. As this cross-linking agent, those conventionally used for pressure-sensitive adhesives can be used, and specific examples thereof include an isocyanate cross-linking agent, an amine cross-linking agent, and an epoxy cross-linking agent. further,
The pressure-sensitive adhesive layer coating material that can be used for the pressure-sensitive adhesive layer 7 is prepared by dissolving a resin having pressure-sensitive adhesive property in a solvent and mixing and stirring the resin. A known and publicly-used coating method can be used for coating the pressure-sensitive adhesive layer 7.

In order to prepare a magnetic passbook using the bonded magnetic recording medium thus formed, a tape-shaped bonded product prepared by once cutting a raw material of the bonded magnetic recording medium into a predetermined width is prepared. Type magnetic recording medium is prepared and used, or the tape-shaped bonded magnetic recording medium is punched into an island shape and processed into a label shape for use. After that, the pressure-sensitive adhesive layer 7 provided on the sticking type magnetic recording medium is first pressure-bonded to a predetermined portion of the passbook substrate 1 at room temperature, and then heated and pressed at a temperature of about 100 to 120 ° C. The adhesion between the recording medium and the passbook substrate 1 is made stronger. By using these methods, it is possible to produce a passbook and passbook with excellent aesthetics.

[0044]

EXAMPLES The sticking type magnetic recording medium of the present invention will be described in more detail below with reference to Examples and Comparative Examples.
The present invention is not limited to the examples, and "parts" hereinafter means "parts by mass".

First, a method for preparing the masking layer coating material 1 of the present invention will be described. <A: Preparation of aluminum thin film piece> Nitrocellulose (HIG7) was dissolved in a mixed solvent of ethyl acetate: isopropyl alcohol = 6: 4 to prepare a 6% solution. The solution was screened with 175 lines / inch and a cell depth of 25μ.
A gravure plate of m was applied onto the polyester film to form a release agent layer. After being sufficiently dried, aluminum was vapor-deposited on the release agent layer to a thickness of 0.04 μm, and the same nitrocellulose solution as that used for the release agent layer was applied to the vapor-deposited film surface in the case of the release agent layer. Coating was performed under the same conditions to form a top coat layer. The vapor-deposited film is immersed in a mixed solvent of ethyl acetate: isopropyl alcohol = 6: 4 to separate the vapor-deposited aluminum film from the polyester film, and then the vapor-deposited aluminum film is pulverized with a stirrer to a size of about 150 μm. , Aluminum thin film pieces were prepared.

<B: Preparation of Aluminum Thin Film Piece Slurry> Aluminum thin film piece 10 parts Ethyl acetate 35 parts Methyl ethyl ketone 30 parts Isopropyl alcohol 30 parts While mixing and stirring the above, 5 parts of a nitrocellulose solution having the following composition was added. Nitrocellulose (HIG1 / 4) 25 parts Ethyl acetate: isopropyl alcohol = 6: 4 mixed solvent 75 parts Using the above mixture while maintaining the temperature at 35 ° C or less, the size of the aluminum thin film piece is 1
Stir (shrink) until it becomes a thin film strip of 0 to 15 μm,
An aluminum thin film strip slurry was prepared.

[0047] <C: Preparation of Masking Layer Coating Material 1>     Aluminum thin film strip slurry 30 parts     Acrylic resin 10 parts       ("DIANAL BR-106" manufactured by Mitsubishi Rayon Co., Ltd.)     30 parts of toluene     30 parts ethyl acetate The above was mixed to prepare a hiding layer coating material 1.

(Example 1) A nonmagnetic support having a thickness of 3
An 8 μm polyethylene terephthalate film was used, and the magnetic recording layer was formed on one side of the film by using the compositions of the following d, the above c and the following e, and the average reproduction output (210 bpi) of the final lamination type magnetic recording medium. ) Is 100%
And the residual magnetic flux (φr) is adjusted so that the concealing layer has a thickness of 0.3 μm after drying, and the colored layer has a thickness of 3 μm after drying. Formed. Then, the composition of the following f was used on the film surface opposite to the surface on which the above-mentioned constituent layers were formed by coating to form an adhesive layer of 30 μm.
Then, a release paper was attached so as to contact the pressure-sensitive adhesive layer. Then, this adhesive magnetic recording medium was cut into a predetermined width to prepare a tape adhesive magnetic recording medium.

[0049] <D: Composition for magnetic recording layer>           Cobalt-coated γ iron oxide 40 parts             {"CTX-970" coercive force 52.8 (kA / m), manufactured by Toda Kogyo}           Vinyl chloride resin 4 parts             ("MR-110" manufactured by Zeon Corporation)           Polyurethane resin 4 parts             ("T-5206" manufactured by Dainippon Ink and Chemicals, Inc.           Isocyanate curing agent 3 parts             ("Coronate L" manufactured by Nippon Polyurethane Company)           MEK 20 copies           20 parts of toluene           Cyclohexanone 9 parts

[0050] <E: Composition for colored layer>           Phthalocyanine 5 parts             ("First Gen Blue TGR" manufactured by Dainippon Ink and Chemicals, Inc.)           Vinyl chloride-vinyl acetate copolymer resin 25 parts             ("VAGH" manufactured by Union Carbide)           MEK 35 parts           25 parts of toluene           10 parts ethyl acetate

[0051] <F: Adhesive layer composition>           Alkylphenol resin 6 parts             ("Tamanor 100S" manufactured by Arakawa Chemical Industry Co., Ltd.)           Acrylic ester / acrylic acid / vinyl acetate copolymer resin 67 parts             ("Cybinol SD-102" manufactured by Saiden Chemical Industry Co., Ltd.)           Toluene 26 parts           Isocyanate curing agent 1 part             ("Coronate L" manufactured by Nippon Polyurethane Company)

Next, the release paper is peeled off from the tape-shaped adhesive magnetic recording medium, and the tape-shaped adhesive magnetic recording medium with the release paper removed is used as a passbook substrate (manufactured by Dynic Corporation, "Magnaprene 702") and then heated and pressed for 2 seconds under the conditions of a temperature of 110 ° C. and a pressure of 0.1 MPa to prepare a passbook substrate with a magnetic recording layer. After that, the opposite surface of the passbook substrate with the magnetic recording layer to which the magnetic recording layer is attached and the PVC substrate for placard are attached so that the total thickness of the magnetic recording layer portion becomes 760 μm. A sample for output measurement of a passbook with a magnetic recording layer was prepared by punching into a desired size.

(Example 2) A tape-shaped sticking type magnetic recording medium was prepared in the same manner as in Example 1 except that the film thickness after drying of the concealing layer was changed to 0.8 µm. A sample for output measurement was prepared in the same manner as in Example 1.

(Example 3) A tape-shaped sticking type magnetic recording medium was prepared in the same manner as in Example 1 except that the film thickness after drying of the hiding layer was changed to 1.0 µm. An output measurement sample was prepared in the same manner as in Example 1.

(Comparative Example 1) A tape-shaped lamination type magnetic recording was carried out in the same manner as in Example 1 except that a masking layer coating material 2 of the following g was used as the masking layer to prepare a masking layer. Created the medium. The aluminum powder used in the hiding layer coating material 2 is "metal thin film strip" in the present invention.
Aluminum powder for silver ink that does not correspond to. <G: Paint 2 for hiding layer> Aluminum powder 20 parts (Showa Aluminum Powder Co., "210EA") Vinyl chloride-vinyl acetate copolymer resin 10 parts (Union Carbide "VAGH") MEK 35 parts Toluene 25 parts Acetic acid 10 parts of ethyl

Comparative Example 2 A tape-shaped adhesive magnetic recording medium was prepared in the same manner as in Comparative Example 1 except that the thickness of the hiding layer after drying was 0.8 μm.

(Comparative Example 3) A tape-shaped adhesive magnetic recording medium was prepared in the same manner as in Comparative Example 1 except that the thickness of the hiding layer after drying was 1.0 μm.

(Comparative Example 4) In Example 1, a metal vapor deposition film layer was used as a masking layer. At this time, the metal used was aluminum, and the vapor deposition film thickness was 500Å. Otherwise in the same manner as in Example 1, a tape-shaped laminated magnetic recording medium was prepared.

(Test Items and Results) [Coloring Property] The vividness of coloring of the obtained laminated magnetic recording medium was visually evaluated. In each of Examples 1 to 3 and Comparative Example 4, the color tone of the magnetic recording layer was completely hidden, and the magnetic recording portion was clear blue. On the other hand, Comparative Examples 1 to
In Comparative Example 3, although the hiding property was improved as the film thickness of the hiding layer was increased, the hiding property was insufficient in all of them, and the magnetic recording portion was turbid blue.

[Interlayer Adhesion] The adhesive magnetic recording medium thus obtained was tested for its interlayer adhesion according to JIS K5600-5-6 (adhesion-crosscut method).
As a result, with respect to Examples 1 to 3 and Comparative Examples 1 to 3 which are the hiding layers obtained by applying the hiding layer coating liquid, the hiding layer between the colored layer and the hiding layer was used. No peeling was observed between the magnetic recording layer and the magnetic recording layer, and the interlayer adhesion was good. On the other hand, in Comparative Example 4 in which the masking layer was provided by the vapor deposition method, peeling occurred between the masking layer and the magnetic recording layer, and the adhesion between the layers was insufficient.

[Storage characteristics] The obtained laminated magnetic recording medium was stored indoors for 6 months, and changes in its appearance were observed.
As a result, no change in appearance was observed in Examples 1 to 3 and Comparative Examples 1 to 3. On the other hand, in Comparative Example 4, minute black spots, which are considered to be caused by the deterioration of the metal vapor deposition film layer, were generated on the surface.

[Resolution] Recording and reproducing characteristics of the output measurement sample are model 690 manufactured by Minato Electronics Co., Ltd.
The measurement was performed using 0.

First, the average reproduction output (8 magnetic flux inversion / mm
For (200 bpi), recording and reproduction were performed under the following conditions, and the size was determined by the ratio with the reproduction output of the reference reproduction tape. Recording condition Function: Write Card type: JIS-2 Format: no format Write data: 0000,0000 Function: normal Write current: 100.0 mA Write density: 200 bpi Playback condition Function: Analysis Card type: JIS-2 Format: no format Standard mode (H): 477 us Standard mode (L): 150 us Edge cut mode: Pulse count 5

Next, the average reproduction output {2
0 magnetic flux reversal / mm (500 bpi)} is obtained, and the average reproduction output of the above measurement {8 magnetic flux reversal / mm (200 bpi)}
Then, the measurement result of the resolution was calculated by (%). Recording condition Function: Write Card type: JIS-2 Format: no format Write data: 1111,1111 Function: normal Write current: 100.0 mA Write density: 250 bpi Playback condition Function: Analysis Card type: JIS-2 Format: no format Standard mode (H): 477 us Standard mode (L): 150 us Edge cut mode: Pulse count 15

In each of Examples 1 to 3 and Comparative Examples 1 to 4, the resolution was 85% or more, which was a good value.

The above evaluation results are shown in Table 1 below. The results are summarized in "Samples of Examples and Comparative Examples and Evaluation Results".

[Table 1] Table 1. Examples and comparative examples Samples and evaluation results

Here, “◯” and “×” in the table represent the following evaluation result contents for each test item. Sharpness ◯: Coloring of the colored layer is very good, and the coloring is clear. X: The coloring of the colored layer is obstructed and the coloring is not clear. Interlayer adhesion ◯: No peeling occurred in the cellophane tape peeling test. X: Peeled by cellophane tape peel test. Storability ○: No change in appearance. X: Occurrence of minute spots.

Table 1. From the results, it was found that in the samples of Examples 1 to 3, even if the film thickness of the hiding layer was as thin as 1 μm or less, the hiding layer was excellent in sharpness and had a sufficient hiding property.
It can be seen that other test items such as adhesion, storability, and resolution have no problem. On the other hand, in Comparative Examples 1 to 3 using the aluminum powder of the conventional product without using the metal thin film strip according to the present invention, the ability to hide the lower magnetic recording layer is insufficient, It can be seen that the sharpness of the colored layer becomes poor. Further, in Comparative Example 4 in which the concealing layer was formed by a vapor deposition film, the storage stability was poor. From the above results, according to the present invention, a sticking type magnetic recording medium provided with vivid colors while satisfying various required quality requirements, and a magnetic passbook with excellent aesthetics by using the same I see that I can do it.

[0069]

INDUSTRIAL APPLICABILITY In a sticking type magnetic recording medium in which a hiding layer and a coloring layer are provided on a magnetic recording layer, the hiding layer contains a binder resin and metal thin film strips, so that the hiding layer has a thickness. Even in a very thin region of 1 μm or less, the hiding property is good, and clear coloring can be applied on the magnetic recording layer without impairing the resolution, which is an important characteristic of magnetic recording characteristics. It was Further, by using the pasting type magnetic recording medium of the present invention, it is possible to obtain a magnetic passbook having a high resolution and a magnetic recording layer portion provided with a clear color.

[Brief description of drawings]

FIG. 1 is a schematic diagram showing an example of a magnetic passbook of the present invention.

FIG. 2 is a view showing a vertical section of a magnetic recording medium for bonding according to the present invention.

FIG. 3 is a view showing a vertical cross section of a magnetic passbook in the case where a magnetic recording layer portion is formed on a passbook substrate by using a sticking magnetic recording medium.

[Explanation of symbols]

1 Passbook base 2 Magnetic recording layer 3 Non-magnetic support 4 Magnetic recording layer 5 Hiding layer 6 colored layers 7 Adhesive layer 9 Release paper

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) G11B 5/735 G06K 19/00 BF term (reference) 2C005 HA06 HB09 HB20 JA01 KA03 KA09 KA10 KA12 KA15 KA37 KA40 KA61 5B035 BA01 BB02 BB12 5D006 AA01 AA04 AA05 AA06 CA01 DA06 EA01

Claims (4)

[Claims] 1. A magnetic recording layer, a hiding layer, and a coloring layer are laminated in this order on one surface of a non-magnetic support from the side closer to the non-magnetic support, and the surface on the opposite side with the non-magnetic support sandwiched therebetween. A sticking type magnetic recording medium provided with an adhesive layer, wherein the concealing layer contains a binder resin and a metal thin film strip. 2. The laminated magnetic recording medium according to claim 1, wherein the metal thin film strip is surface-treated with an organic fatty acid, methylsilyl isocyanate, or a cellulose derivative. 3. The thickness of the hiding layer is 0.1 μm to 1 μm.
The adhesive magnetic recording medium according to claim 1 or 2, wherein m is m. 4. A magnetic passbook prepared by pasting the pasting type magnetic recording medium according to claim 1 on a passbook substrate.