JP2001126241A - Magnetic recording medium - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a magnetic recording medium which can maintain high output and resolution even when a thick shielding layer such as a nonmagnetic layer is formed on a magnetic recording layer so that a multilayered structure such as a color layer and a pattern layer can be formed on a magnetic stripe such as a bankbook and that a magnetic recording medium such as a bankbook showing high decorating property and good electromagnetic conversion characteristics can be obtained. SOLUTION: A magnetic layer, color layer and pattern layer are laminated in this order on one surface of a substrate for lamination and an adhesive layer is formed on the other surface to constitute a magnetic recording medium for lamination. In this magnetic recording medium, the squareness ratio of the magnetic recording layer is >=0.88 and <=0.99 and SFD is >=0.01 to <=0.20. The magnetic recording medium such as a bankbook is produced in a laminating process by using the magnetic recording medium for lamination.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic recording medium, and more particularly to a magnetic recording medium used for a bank passbook, a postal savings passbook, and the like. Further, the present invention relates to a magnetic recording medium for lamination such as a magnetic label laminate having a magnetic recording layer, which is used when such a magnetic recording medium is manufactured through a bonding step.

[0002] In the present invention, the magnetic layer and the magnetic recording layer are used as having the same meaning.

The passbook magnetic recording medium of the present invention broadly includes a medium used as a passbook with a magnetic stripe, and a medium such as a pasting magnetic recording medium used for producing the medium. However, it is a medium with a magnetic stripe in which a laminate including a magnetic recording layer such as a stripe is formed on a non-magnetic support in the form of a booklet. A medium that can also input and output magnetic data.

[0004] The lamination magnetic recording medium is a medium in which a laminate including a magnetic recording layer is formed on a lamination substrate.
This is a general term for media used in the manufacture of magnetic recording media such as passbooks with magnetic stripes, which are attached to other substrates together with the bonding substrates, and there are various shapes such as raw materials, sheets, and tapes. In addition, a magnetic label laminate, a magnetic label tape, and the like are also included therein.

[0005]

2. Description of the Related Art A passbook for use statement recording used for a bank passbook and a postal savings passbook is generally in the form of a booklet made of paper as shown in FIG. 1, and one side of a front cover or a back cover of the booklet. A magnetic recording layer is formed on a part or the whole of both surfaces.

[0006] Such a magnetic recording layer is manufactured using a magnetic recording medium for bonding, which is a laminate having a magnetic layer on at least one surface and an adhesive layer on the other surface with a nonmagnetic support interposed therebetween. Is done. The magnetic recording medium for lamination having various shapes such as a raw material, a sheet, a tape, and the like, is laminated under pressure and heat by using a magnetic label laminate formed by cutting the magnetic recording medium to a predetermined standard width and length. In the attaching step, a magnetic recording area such as a stripe is formed on the passbook substrate.

However, these magnetic recording layers originally exhibit a black or brown color derived from the color of the magnetic powder, and their colored portions are exposed on the passbook surface. In order to restrict the printing area and restrict the degree of freedom of design, the aesthetic quality of the passbook has been reduced or the design has been hindered.

As a means for solving such a problem, a method of providing a colored layer on a label-shaped or stripe-shaped magnetic recording layer formed on a passbook up to now to improve the aesthetics of a card or a passbook, and to improve the design. Is being improved.

Usually, these colored layers are laminated in advance as a part of a laminated body of a magnetic recording medium for lamination, and are attached together with the magnetic recording layer in a laminating step of a magnetic label laminated body or the like, for example. The magnetic recording medium for lamination, which conceals the layer and is called, for example, a lamination type color magnetic tape, has such a configuration and function.

However, when a large number of non-magnetic layers such as a colored layer, a pattern layer, and a protective layer are formed on the magnetic recording layer in order to improve the aesthetics and the design, the magnetic head and the magnetic recording layer need to be separated. The spacing is inevitably greater than the thickness of one conventional protective layer or the thickness of one colored layer in the case of a laminated type color magnetic tape, 0.5 to 5 μm, and various designs are provided on the magnetic tape. For example, the total thickness of the non-magnetic layer on the magnetic recording layer is usually in the range of 5 to 20 μm.

In magnetic recording, when the gap between the magnetic head and the magnetic recording layer is widened, the reproduction output is reduced due to spacing loss, and the recording and reproduction characteristics required as a magnetic recording medium cannot be maintained.

Therefore, conventionally, as the total thickness of the non-magnetic layer provided on the magnetic recording layer such as the colored layer, the pattern layer, the protective layer, etc. increases, the thickness of the magnetic recording layer is increased, A method of increasing the effective magnetic flux density existing on the medium surface, thereby compensating for the loss of reproduction output due to the increase in the thickness of the non-magnetic layer, and adapting the reproduction output of a magnetic recording medium such as a passbook to a standard. Generally done.

In practice, the reproduction output depends on the number of effective magnetic fluxes on the surface of the magnetic recording medium that traverses the head, and this effective magnetic flux number is the magnitude of the number of residual magnetic fluxes traversing a plane perpendicular to the magnetic recording direction in the magnetic recording layer. Depends on. For this reason, as the film thickness increases, the number of residual magnetic fluxes also increases, and their contribution to the medium surface increases, so that the effective magnetic flux number on the surface of the magnetic recording medium also increases. Therefore, if the distribution of the residual magnetic flux density in the magnetic recording layer in the width direction is uniform, the number of residual magnetic fluxes per unit width of the magnetic recording medium (φr, unit: Wb / m) is measured and calculated, so that the voltage is applied to the head. The magnitude of the effective magnetic flux number on the surface of the magnetic recording medium to be induced can be defined. In fact, by changing the magnetic material or increasing the thickness of the magnetic recording layer, the reproduction output reduced by the thickness of the nonmagnetic layer is compensated for by increasing φr.

However, the resolution, which is another important characteristic of magnetic recording, is lowered not only by the thickness of the non-magnetic layer on the magnetic recording layer but also by the increase in the thickness of the magnetic recording layer itself. This is because, due to an increase in various losses such as “spacing loss” due to the non-magnetic layer and “media thickness loss” due to an increase in the thickness of the magnetic recording layer, output loss particularly in a high frequency region increases, so that the This is because the resolution represented by the output voltage ratio decreases. For this reason, in the above-described method for improving the reproduction output in which the thickness of the magnetic recording layer is increased in accordance with the thickness of the non-magnetic layer to increase the effective magnetic flux number on the surface of the magnetic recording medium, it is essentially impossible to compensate for the decrease in resolution. It was not possible, and this was a major problem associated with an increase in the thickness of the nonmagnetic layer.

A bonding magnetic recording medium used for forming a magnetic stripe formed on the surface of a passbook or the like, or a bonding step (bonding step) using the bonding magnetic recording medium.
Although magnetic recording media such as passbooks with magnetic stripes manufactured through the process do not have official standards such as plastic magnetic cards, the same recording density and recording method as magnetic cards, and even the same reliability, Since durability is required, a resolution of 70% or more is required substantially as in JIS X6302 “Identification Card with Magnetic Stripe”. For this reason, as a result of pursuing the aesthetics and design of the magnetic stripe portion for the passbook, there has been a problem that the above standard cannot be satisfied when the thickness of the nonmagnetic layer such as the colored layer and the pattern layer is increased.

Here, the resolution is 20 magnetic flux reversals / mm.
The average peak output voltage of the reproduced output signal at a recording density of {500 magnetic flux inversion / inch (abbreviated to 500 bpi)} and 8 magnetic flux inversion / mm ／ 200 magnetic flux inversion / inch (20
0bpi) is defined by the ratio of the reproduced output signal to the average peak output voltage at the recording density of｝.

As described above, the situation in which the resolution is reduced due to the increase in the thickness of the non-magnetic layer formed on the magnetic recording layer for imparting the design property impairs the design freedom of the passbook design. Magnetic recording layer with less decrease in resolution even when the non-magnetic layer on the recording layer becomes thicker, or has higher resolution than conventional products even with the same non-magnetic layer thickness, hindering design freedom in design There was no need for a magnetic recording layer.

In this regard, as a magnetic material used for a magnetic recording layer of an ordinary magnetic recording medium for video, audio, etc., various improvements have hitherto been made for higher performance. There are many types. However, such a finding can be taken from a magnetic recording medium such as a magnetic recording medium for lamination having a thick non-magnetic layer on the magnetic recording layer, such that the hue of the magnetic layer is completely hidden, or the lamination. Applied to magnetic recording media such as passbooks with magnetic stripes, which are manufactured by a lamination process using magnetic recording media, and verify the effectiveness of various magnetic materials in terms of improving their characteristics, and determine the optimal design range. Cases are rare.

For example, to solve such a problem,
JP-A-3-248325 proposes to use a ferromagnetic metal powder for a magnetic recording layer.

The method described in the above publication is very effective in improving reproduction output. However, the medium using the ferromagnetic metal powder has a problem that it is difficult to maintain the magnetic characteristics due to oxidation change of the metal magnetic powder as the medium. In addition, because of the insufficient acid resistance and weather resistance required for the magnetic stripe on the passbook, a method more stable than the above-mentioned method using ferromagnetic metal powder has been required.

[0021]

That is, an object of the present invention is to adopt a non-magnetic layer having a large thickness so as to completely cover the magnetic recording layer, and to reduce the spacing loss between the head and the magnetic recording layer. The present invention provides a magnetic recording medium that still retains a high reproduction output and resolution even if the size of the magnetic recording medium is increased, and thereby a magnetic recording medium for bonding used in a bonding step of a magnetic label laminate or the like, or the magnetic recording medium for bonding. Thereby, it is possible to increase the thickness of the non-magnetic layer on the magnetic recording layer of a magnetic recording medium such as a passbook with a magnetic stripe manufactured through the laminating step, thereby increasing the degree of freedom in designing these magnetic recording media. Thus, it is possible to manufacture a passbook or the like which has a higher design property than the related art and is excellent in aesthetics.

[0022]

The above objects are achieved by the present invention described below. That is, the above-mentioned object is a laminating magnetic material in which a non-magnetic layer such as a colored layer or a pattern layer, which completely conceals the hue, is laminated on a non-magnetic substrate for a card, a passbook, or the like, on the magnetic recording layer. When a magnetic stripe is formed by a sticking step (sticking step) using a recording medium, the square ratio of the magnetic recording layer is 0.88 or more and less than 1, and the SFD is more than 0 and 0.20 or less; More preferably, the squareness ratio is 0.90 or more and less than 1, and SFD is 0.
It is attained by using a magnetic recording medium for bonding, which is larger than 0.15.

The present invention is also achieved by a card, a passbook, and the like manufactured using such a magnetic recording medium for bonding.

If the squareness ratio of the magnetic recording layer is 0.88 or more, it is preferable that the squareness ratio is as close to 1 as possible. However, in consideration of practical values in practical use, 0.99 or less and SFD is 0.20 or less. In this case, the smaller the value, the better. However, this is also 0.01 or more in consideration of a realistic value as described above.

Further, it has been found that by using a hexagonal ferrite magnetic material as a magnetic recording medium, the squareness ratio and SFD of the magnetic recording layer can be more easily improved, and the results obtained by using such magnetic powder can be obtained. A bonding magnetic recording medium for forming a striped magnetic layer such as a passbook with a magnetic stripe (hereinafter referred to as “for a passbook magnetic stripe”) is particularly excellent in reproduction output and resolution. It was also found that environmental stability and weather resistance were excellent.

There are many examples in which a hexagonal ferrite magnetic material is easily used for a magnetic recording medium, which is likely to exhibit high characteristics relating to squareness ratio and SFD, but these are further improved as in the present invention.
Moreover, there has been no example in which a magnetic stripe such as a passbook with a magnetic stripe is used as a magnetic recording medium for bonding.

The magnetic recording medium for lamination as described above of the present invention, or a magnetic recording medium such as a passbook with a magnetic stripe, which is manufactured through the laminating step using the magnetic recording medium for lamination, has a particularly high coercive force. Hc is 47.4 kA / m or more 5
When it is 5.7 kA / m or less, compatibility with a conventional magnetic recording medium for a passbook is maintained, and it is more desirable because it can sufficiently function with a conventional encoder and terminal.

Here, as shown in FIG.
This represents the rising slope of the H curve. A steep slope indicates that the distribution of Hc is narrow, and it is considered that magnetization reversal is more likely to occur more rapidly.

In the magnetic recording on the magnetic stripe portion of the passbook with a magnetic stripe, which is a magnetic recording medium having undergone a typical attaching step (attaching step), the recorded information is "1", "1".
After conversion to binary information of 0 ", FM system, RZ system, NRZ
By applying a square wave signal coded by the NRZ-I method, the NRZ-I method, the PE method, etc. to the magnetic head, 210 bpi, 150 bpi, 105 bpi, 100 b
Recording is performed at an average recording density of pi, 75 bpi, 50 bpi, or the like.

At the time of reproduction, the reproducing head generates a pulse voltage corresponding to a change in magnetic flux leakage from the magnetic recording layer magnetized at the time of recording, in a coil wound around the head. The peak output voltage mentioned earlier in the definition of the resolution is the maximum output voltage at this time.

Therefore, as a preferable recording / reproducing characteristic for good magnetic recording, it is important that the peak output voltage of the reproduced output is high. Is also important, as defined in the aforementioned JIS X6302 Annex. As described above, the peak output voltage depends on the magnitude of the effective magnetic flux number on the surface of the magnetic recording medium, but also depends on the rise of the reproduction pulse or the reproduction pulse width. The higher the time resolution, the faster the output rises,
The peak output voltage is also higher. From this point as well, it can be understood that the time resolution is a particularly important characteristic for a magnetic recording medium such as a bonding magnetic recording medium used for a passbook magnetic stripe.

The present inventors have proposed a magnetic recording medium such as a passbook with a magnetic stripe having the above-mentioned colored layer or pattern layer, or a magnetic recording medium for a pasting passbook used for manufacturing these magnetic recording media. As a result of studying the improvement of the resolution and the improvement of the resolution reduction with the increase in the thickness of the colored layer and the pattern layer, for example, the electromagnetic conversion characteristics of the magnetic recording medium manufactured by the lamination process of the lamination magnetic recording medium are as follows. I found something.

That is, as shown in the present invention, SFD
In a magnetic recording medium with a small coercive force Hc and a small distribution of coercive force, abrupt magnetization reversal at the time of signal recording is apt to occur, so that the reproduction output waveform rises steeply, the separation between the reproduction pulse waveforms is good, and the Indicates the resolution. The signal recording on the magnetic stripe on the passbook is pulse recording as described above, and the high resolution characteristic is a very important characteristic for a passbook magnetic recording medium, for example.

The characteristic of the reproduction output characteristic of such a high-resolution magnetic recording medium is that even when a non-magnetic layer such as a colored layer is interposed on the magnetic recording layer, the magnetic recording medium having a low resolution can be used. As compared with the medium, the improvement effect can be sufficiently maintained.

Further, as for the magnitude of the reproduced waveform output, the higher the squareness ratio of the magnetic recording layer of the magnetic recording medium, the higher the S
As the value of FD is smaller, the waveform becomes steeper, and the peak output voltage becomes higher. By using a magnetic recording medium having such low SFD and high squareness characteristics, even when the thickness of a non-magnetic layer such as a concealment layer on the magnetic recording layer becomes large, the same residual magnetic flux density can be obtained. Conventional SFD with
As compared with a magnetic recording medium having a squareness value, a larger reproduction output can be obtained. That is, even if the thickness of the magnetic layer is the same as that of the related art, a higher reproduction output can be realized while maintaining a high resolution.

As described above, a magnetic recording medium that satisfies the numerical ranges shown in the claims with respect to the squareness ratio and the SFD is used for a magnetic recording medium such as a passbook with a magnetic stripe, such as a reproduction output and a resolution. The present invention brings about an improvement in both properties required for a magnetic recording medium such as a magnetic recording medium for lamination used in production through a lamination step of a medium.

That is, the magnetic recording layer of the magnetic recording medium according to the present invention has a higher resolution than the magnetic recording layer of the conventional magnetic recording medium, and is formed on the magnetic recording layer. Even if the resolution is reduced due to the increase in the thickness of the nonmagnetic layer, the resolution is superior to that of the conventional magnetic recording layer. Therefore, for the purpose of improving the decorativeness, etc., the degree of freedom in design for adding a non-magnetic layer such as printing applied on the magnetic recording layer or adding other non-magnetic layers similar thereto is increased. Can be. For this reason, it is possible to manufacture a passbook having a high design and a superior aesthetics.

Furthermore, compared with other types of magnetic media having the same residual magnetic flux density, the reproduction output itself is improved, so that a decrease in output due to an increase in the thickness of the nonmagnetic layer can be compensated at the same time. .

[0039]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention includes the following inventions and embodiments.

1. In a magnetic recording medium in which an adhesive layer, a non-magnetic support, a magnetic recording layer, and a coloring layer are laminated in this order on a non-magnetic substrate, when the square ratio of the magnetic recording layer is 0.88 or more, 1
A magnetic recording medium characterized in that the SFD is less than 0 and the SFD is more than 0 and 0.20 or less.

2. 2. The magnetic recording medium according to the above item 1, further comprising a protective layer on the coloring layer.

3. 3. The magnetic recording medium according to 1 or 2, further comprising a pattern layer between the coloring layer and the protective layer.

4. A magnetic recording medium comprising a laminated structure including a magnetic recording layer formed on a non-magnetic substrate, wherein a non-magnetic layer for completely hiding the hue of the magnetic recording layer is laminated on the magnetic recording layer. In the recording medium, the laminated structure including the magnetic recording layer on the non-magnetic substrate, wherein the square ratio of the magnetic recording layer is 0.88 or more and less than 1 and the SFD is more than 0 and 0.20 or less, and 4. The magnetic recording medium according to any one of the above items 1, 2 and 3, wherein the magnetic recording medium is formed by a step of attaching a laminated structure in the magnetic recording medium.

5. 5. The magnetic recording medium according to any one of the above items 1, 2, 3, and 4, wherein the non-magnetic substrate has a booklet shape.

6 6. The magnetic recording medium according to the item 5, wherein the magnetic recording medium is for a passbook.

7. A magnetic recording layer and a colored layer are laminated in this order on one surface of a non-magnetic support serving as a lamination substrate, and a lamination magnetic recording medium in which an adhesive layer is laminated on the other surface. A magnetic recording medium for lamination, wherein the squareness ratio is 0.88 or more and less than 1 and SFD is more than 0 and 0.20 or less.

8. 8. The bonding magnetic recording medium according to the item 7, wherein the magnetic recording medium has a protective layer on the coloring layer.

9. 9. The laminating magnetic recording medium according to the above item 8, comprising a pattern layer between the coloring layer and the protective layer.

10. The above 1, wherein a hexagonal ferrite magnetic material is used as a magnetic powder in the magnetic recording layer.
2. The magnetic recording medium according to 2, 3, 4, 5, 6, 7, 8, or 9.

11. The coercive force Hc of the magnetic recording layer is 47.7
kA / m (600 Oersted) or more, 55.7 kA /
m (700 Oe) or less, The magnetic recording medium according to the above 1, 2, 3, 4, 5, 6, 7, 8, 9, 10;

FIG. 1 is a schematic view of a passbook with a magnetic stripe according to one embodiment of the present invention. FIG. 2 is a diagram showing a magnetic label laminate as a bonding magnetic recording medium for forming a magnetic stripe for a passbook. FIG. 3 is a cross-sectional view of a magnetic stripe portion of a passbook with a magnetic stripe formed using the magnetic label laminate. Hereinafter, each component will be described in detail with reference to these drawings.

As the base 1 of the passbook, for example, a cloth for magnetic passbook or the like, which is made of a cloth cloth as a base cloth and coated with a resin having good surface smoothness, is used.

Using this substrate 1 as a cover of a booklet, a magnetic stripe 2 which is a laminate including a magnetic recording layer is formed on a part or the whole of one or both of the front cover and the back cover.

Next, each constituent material of the magnetic stripe portion of the passbook with a magnetic stripe of the present invention or each constituent material of the magnetic recording medium for lamination used in the production of the passbook through the lamination process will be described in detail. I do.

The passbook substrate 8 is generally specified to use the above-mentioned magnetic passbook cloth paper, but the surface is made of resin coating which is suitable for attaching magnetic stripes and has good surface smoothness. A coated paper for magnetic passbooks or the like is used, and the surface roughness of the magnetic stripe attachment surface (cross paper) is preferably 20 μm or less in terms of the center line average surface roughness (however, the magnetic stripe attachment strength is low). 15 from the point
μm or less is more desirable).

On the other hand, as shown in FIG. 2, the structure of the magnetic label laminate used in the manufacture of a magnetic recording medium such as a passbook with a magnetic stripe in the sticking step (sticking step) is one of the magnetic label base 1. A magnetic recording layer 2 is formed on the surface, and a protective layer 5 (when there is no colored layer or pattern layer) is formed thereon. Further, an adhesive layer (pressure-sensitive adhesive layer) 6 is provided on the other surface of the magnetic label substrate 1. Usually, release paper 7 and the like are attached on the adhesive layer.

Further, from the viewpoint of improving aesthetics and design,
A colored layer 3 and a pattern layer 4 for concealing the hue of the magnetic recording layer are provided between the magnetic recording layer 2 and the protective layer 5.

Usually, such a laminated structure of a magnetic recording medium for lamination such as a magnetic label laminated body is formed by coating each constituent layer by layering on a raw material of a film-like lamination substrate.

Thereafter, the material is cut into a sheet,
Further, in some cases, the magnetic label laminate is cut into a desired size from a raw material or a sheet by a method such as slitting or punching before use. Further, a tape-shaped slit of a magnetic recording medium for bonding may be formed from the raw material or the above-mentioned sheet, and used as a magnetic label tape.
When affixing to the passbook substrate, the magnetic label laminate including the magnetic recording layer 2 is superimposed on the passbook substrate 8 via the adhesive layer 6, and pressure and heat are applied to the passbook substrate 8 to apply the pressure to the passbook substrate. To form a magnetic stripe B

Hereinafter, a method for forming the magnetic recording layer will be described.

For the magnetic recording medium for lamination used in the manufacture of a magnetic recording medium such as a passbook with a magnetic stripe in the laminating step, the binder resin for the magnetic coating used for this is a general coating resin. It can be widely used. For example, butyral resin, vinyl chloride-vinyl acetate copolymer resin, urethane resin, polyester resin, cellulose resin, acrylic resin, styrene-maleic acid copolymer resin, etc. Vinyl resins are particularly desirable in that they have excellent magnetic material dispersibility. Further, a rubber-based resin such as nitrile rubber, a urethane elastomer, or the like can be added to these resins as needed. Further, heat curing can also be performed using an isocyanate compound.

Further, in the dispersion obtained by dispersing the magnetic powder in the above resin, if necessary, auxiliary agents such as a surfactant, a silane coupling agent, a plasticizer, a wax, and a silicone oil; Carbon black and other fillers can also be added.

Here, the magnetic powder used in the present invention includes:
γ-Fe ₂ O ₃ , Co-coated γ-Fe ₂ O ₃ , Fe ₃ O ₄ , Co
Conventionally known magnetic powders such as Fe ₃ O ₄ , CrO ₂ , Ba ferrite, Sr ferrite, Pb ferrite and Ca ferrite can be used. Among them, the general formula MO · 6Fe
₂ 0 ₃ (M is Ba, Sr, Pb, at least one metallic element selected from Ca) represented by, more F of the trivalent
A so-called hexagonal ferrite magnetic material in which a part of e is substituted with a metal element having an average valence of 3 is more advantageous in that the squareness ratio and SFD required in the present invention can be obtained stably and easily. preferable.

The hexagonal ferrite used is BET.
Value is 3 m ² / g or more, and desirably, BET value is 4.0 m ² / g or more and 10.0 m ² / g or less. If the BET is smaller than the above, unevenness is apt to occur in the arrangement of the plate-shaped magnetic bodies, and as a result, erasing noise increases, which is not preferable. The BET value is 10.
If it is 0 m ² / g or more, it is difficult to disperse and orient the magnetic powder, and it is difficult to satisfy the requirements of the present invention. This range is also appropriate because the recording density of signals recorded on the magnetic recording medium for the passbook magnetic stripe is relatively low.

Here, the specific surface area (BET) is a value obtained by using a monosorb direct-reading specific surface area measuring device and calculating the surface area by the principle of the BET one-point method utilizing the absorption / desorption characteristics of nitrogen gas and the like with respect to a sample. is there.

As the hexagonal ferrite, those produced by any method such as a coprecipitation-calcination method, a hydrothermal synthesis method, and a glass crystallization method can be used.

Examples of the solvent used for the magnetic paint used in the present invention include acetone, methyl ethyl ketone (M
EK), ketone solvents such as methyl isobutyl ketone (MIBK) and cyclohexanone; ester solvents such as methyl acetate, ethyl acetate and butyl acetate; alcohol solvents such as methanol, ethanol and propanol; hexane, benzene, toluene and xylene And ether solvents such as glycol dimethyl ether, glycol monoethyl ether, dioxane, and tetrahydrofuran. These solvents can be used as a mixture of two or more kinds.

The coating solution 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 / dispersing machine.

Other additives of the coating solution, and the ratio of each component,
Known information can be used for the compounding method.

In kneading and dispersing for preparing the coating solution for the magnetic recording layer, various kneading and dispersing machines can be used. Examples of the kneading and dispersing machine include a two-roll mill, a three-roll mill, a ball mill, a pebble mill, a Henschel mixer, a cobol mill, a tron mill, a sand mill,
Examples include a sand grinder, a segbar lighter, a high-speed impeller disperser, a high-speed stone mill, a high-speed impact mill, a disper, a high-speed mixer, a homogenizer, an ultrasonic disperser, an open kneader, a continuous kneader, and a pressure kneader.

On a magnetic recording medium such as a passbook with a magnetic stripe, recording is performed at a longer wavelength than a magnetic recording medium such as an audio tape or a video tape. Therefore, the output is almost proportional to the amount of magnetization of the magnetic powder used or the thickness of the magnetic recording layer. The thickness of the magnetic recording layer needs to be large in order to ensure data stability and respond to high output. For this reason, the thickness of the magnetic recording layer exceeds 5 μm and exceeds 100 μm.
The range of not more than μm is preferred. The thickness of the magnetic recording layer is 5 μm
If it is less than 100 μm, the output of the passbook magnetic recording medium will be insufficient. A more preferred range is more than 5 μm and 20 μm or less.

The application of the magnetic recording layer is not particularly limited, and a known coating method may be used. After applying a predetermined amount of the magnetic paint, the direction of easy magnetization of the magnetic powder is set in the longitudinal direction of application of the magnetic recording layer. An orientation treatment is performed so as to achieve drying.

The method of applying the magnetic recording layer is not particularly limited, and a known coating method may be used, and the magnetic recording layer is manufactured according to a method used for manufacturing a magnetic recording medium having a single layer or a plurality of layers. For example, gravure method, reverse method, air doctor coater method, blade coater method, air knife coater method, squeeze coater method, impregnation coater method, transfer roll coater method, kiss coater method, cast coater method, spray coater method, die method Etc. can be used.

As the orientation method, a known method, for example, a repulsion facing permanent magnet, a solenoid type electromagnet or the like can be used. The magnetic field strength is preferably in the range of 1000 to 6000G.

Next, a laminate such as a magnetic label laminate, which is one of the magnetic recording media for lamination used in the present invention, will be described.
Various constituent materials used other than the magnetic recording layer will be described in detail.

As the bonding substrate 1 that can be used for a magnetic recording medium for bonding such as a magnetic label laminate, any known bonding substrate can be used. Examples thereof include polyesters such as polyethylene terephthalate and polyethylene-2, 6-naphthalate, polyolefins such as polypropylene, cellulose derivatives such as cellulose triacetate and cellulose diacetate, and plastics such as polyamide and polycarbonate. Among them, polyethylene terephthalate, which has both tensile strength and heat resistance, is preferred.

The thickness of the bonding substrate 1 of the magnetic recording medium for bonding such as a magnetic label laminate is not particularly limited, but is usually 10 to 100 μm, preferably 20 to 80 μm.

Next, with respect to the pattern layer 4 and the colored layer 3, the colored layer 3 is applied to conceal the color of the magnetic recording layer 2 and to improve the decorativeness of the passbook itself. The layer 4 is applied for further improving decorativeness.

The colored layer 3 whose concealing property is important is not limited to a single layer but may be a multilayer. Pigments used in the coloring layer include inorganic pigments such as alumina, titanium oxide, chromium oxide, iron oxide, zinc oxide, and barium sulfate; and organic pigments such as azo pigments, phthalocyanine pigments, quinacridone pigments, and perylene pigments. , Anthraquinone pigments, thioindigo pigments, indanthrene pigments and the like, but are not particularly limited.

In order to form the pattern layer 4 and the colored layer 3, a pigment may be used alone or as a mixture of two or more kinds in a binder resin and dispersed by a known method to prepare a coating solution for coloring. Apply with.

The pattern layer 4 and the colored layer 3 can be formed by, for example, applying and printing a printing ink containing a pigment, a resin binder, and a solvent for dissolving the resin binder on the card substrate described above.

As the resin binder and the solvent, those described above for the magnetic recording layer can be used.

The pattern layer 4 and the colored layer 3 can be formed by a known printing method such as gravure printing, flexographic printing, offset printing, and screen printing.

First, the magnetic recording layer of the present invention is formed on the above substrate by the above-described method, and then the colored layer 3 and the patterned layer 4 are formed.
Is applied to conceal the magnetic color of the magnetic recording layer 2 and to improve the decorativeness of the passbook itself.

If the thickness of the pattern layer and the colored layer is too small, the magnetic color of the magnetic recording layer cannot be concealed. If the thickness is too large, the reproduction output decreases due to spacing loss. Therefore, it is usually used in the range of 0.5 to 20 μm.

Further, as a method of more effectively shielding the magnetic color of the magnetic recording layer, the magnetic recording layer 2, the colored layer 3, the pattern layer 4
A metal deposition film can be provided between aluminum,
A metal deposited layer of tin, gold, silver, platinum, or the like can be used. By using this method, the magnetic color can be concealed with a thinner film thickness as compared with the formation of a coating film by applying a coloring paint, and deterioration of characteristics such as output and resolution can be prevented.

The range of the film thickness used as the metal deposition film is usually 0.05 to 0.1 μm.

Further, a magnetic recording layer 2, a coloring layer 3, and a pattern layer 4 are sequentially provided on the above magnetic label substrate, and a protective layer which also has a surface protecting function as the outermost layer of each of the formed layers. Layer 5 can also be provided.

The material constituting the protective layer 5 is preferably a material which is highly durable and has heat resistance since it is subjected to heat and pressure when adhering to the passbook substrate 8, and examples thereof include a cellulose resin, a polyvinyl butyral resin, Epoxy resins, phenol resins, polyester resins, polyurethane resins, acrylic resins, polymethyl methacrylates and copolymers thereof, melamine resins and the like, and mixtures of these resins can be mentioned.

Further, soybean lecithin, phthalic acid-based plasticizer, microsilica, wax, or the like may be added to the protective layer 5 as needed, as a film modifier.

The protective layer 5 is formed, for example, by applying a coating obtained by dissolving or dispersing the above constituents in a solvent on the magnetic recording layer 2, the colored layer 3, or the pattern layer 4 by a known method. It is formed.

On the other hand, when the bonding magnetic recording medium, such as the magnetic label laminate, which is the bonding magnetic recording medium, is adhered to the passbook, an adhesive layer provided on the opposite side of the magnetic recording layer on the magnetic label laminate is used. The pressure-sensitive adhesive layer 6 is first pressure-bonded to a predetermined portion of the passbook substrate at normal temperature, and then heated and pressed at a temperature of about 120 ° C. to further strengthen the adhesion. Therefore, it is desirable that the pressure-sensitive adhesive layer 6 provided on the surface of the magnetic label substrate opposite to the magnetic recording layer be a pressure-sensitive pressure-sensitive adhesive that has excellent adhesive strength both at the time of room temperature pressure bonding and after heating and pressing.

Examples of the pressure-sensitive adhesive resin used for the pressure-sensitive adhesive layer 6 for the magnetic label laminate, which is a magnetic recording medium for bonding, include alkyl acrylate and (meth) alkyl ester.
Copolymer with acrylic acid, copolymer of alkyl acrylate and (meth) acrylic acid and vinyl acetate, copolymer of vinyl chloride and vinyl acetate, or further vinyl alcohol, maleic anhydride or acrylic acid And vinyl chloride resins such as copolymers, polyester resins, acrylic resins, polyimide resins, polyurethane resins, and phenol resins.

Further, by adding a cross-linking agent to the above resin composition, it is possible to control the adhesive strength at room temperature pressure bonding and the adhesive strength after heating. As the cross-linking agent, those conventionally used for pressure-sensitive adhesives can be used, and specific examples thereof include an isocyanate-based cross-linking agent, an amine-based cross-linking agent, and an epoxy-based cross-linking agent.

The coating for the pressure-sensitive adhesive layer which can be used for the pressure-sensitive adhesive layer 6 is prepared by dissolving a resin exhibiting pressure-sensitive adhesive in a solvent at 3 to 20% by mass of the resin with respect to the solvent. Adjust by stirring. The application of the pressure-sensitive adhesive layer 6 can be performed by the known and commonly used application method described for the magnetic recording layer 2.

The range of the thickness of the pressure-sensitive adhesive layer is usually from 5 to
100 μm is used.

As a bonding magnetic recording medium, usually, an adhesive layer such as a pressure-sensitive adhesive layer is formed in advance on the surface of the bonding substrate opposite to the magnetic recording layer, but this adhesive layer is not formed.
An adhesive layer may be separately formed on the side of the base such as a passbook by application or the like, and the adhesive layers may be laminated using a magnetic recording medium for lamination such as a magnetic label laminate having no adhesive layer.

In order to prepare a passbook with a magnetic stripe through the attaching step using the magnetic label laminate formed as described above, the raw material or sheet of the magnetic recording medium for pasting is once set to a predetermined width. Create a magnetic label tape created by cutting into
Alternatively, a method is used in which a portion to be used for a magnetic stripe is directly punched from the material or sheet into an island shape and used as a label.

Thereafter, as described above, the pressure-sensitive adhesive layer 6 provided on the magnetic label laminate is first pressed at a predetermined temperature on the passbook substrate 8 at a normal temperature, and then heated at a temperature of about 100 to 120 ° C. And pressurized together to further strengthen the adhesion between the magnetic label laminate and the passbook substrate 1.

By using these techniques, a magnetic recording medium for a passbook magnetic stripe having a complicated pattern and excellent in design can be manufactured.

The use of a magnetic recording medium for lamination such as a magnetic label laminate for the magnetic stripe on the passbook as described above requires a thicker magnetic label as a whole than the transfer laminate. This is advantageous in that it is less susceptible to output fluctuations due to the uneven shape.

The gist of the present invention is that the coercive force is approximately 52.0 k.
For example, a hexagonal ferrite magnetic powder is used for the magnetic recording layer of the “magnetic stripe for passbook” defined by A / m (650 Oersted), and the squareness ratio is 0.88 or more and less than 1 and the SFD is 0 or more. By achieving a large value of 0.20 or less, more preferably a squareness ratio of 0.90 or more and less than 1 and an SFD of more than 0 and 0.15 or less, the distance between the top surface of the magnetic stripe and the magnetic recording layer can be reduced. Colored layer,
When the total thickness of the pattern layer layer, the protective layer, and the like is large, a higher resolution is realized than when a conventional magnetic recording layer is used. It expands the design freedom of the entire passbook.

Therefore, the embodiment is not limited to the above-described “magnetic label laminate” as the laminating magnetic recording medium and a magnetic recording medium such as a passbook produced by the lamination, and is not limited to a magnetic recording layer. The present invention can be effectively applied to a magnetic recording medium having any functional layer as described above, and further to a magnetic recording medium for bonding used when the magnetic recording medium is manufactured through a bonding step.

[0104]

EXAMPLES Hereinafter, of the present invention, a magnetic label laminate used for producing a magnetic stripe of a passbook with a magnetic stripe will be described in more detail with reference to Examples and Comparative Examples. Not limited,
In the following, “parts” indicates parts by mass.

Hereinafter, using magnetic powders having different magnetic properties,
Various magnetic recording medium samples for lamination are manufactured while changing the thickness of the magnetic layer and the thickness of the non-magnetic layer, and a magnetic recording medium for measurement is manufactured through the lamination process, and the magnetic characteristics and electromagnetic conversion characteristics are measured. did.

Example 1 A 38 μm-thick polyethylene terephthalate film was used as a support film as a base for a magnetic label-like laminate used in the attaching step, and the following a, b, c, d), the film thickness of the magnetic recording layer after drying was
r is 1.45 to 1.55 (μWb / m)
The colored layer 1 was formed so as to have a thickness of 4 μm, the colored layer 2 was formed so as to have a thickness of 4 μm, and the protective layer was dried so as to have a thickness of 2 μm. After that, the following e
The pressure-sensitive adhesive layer was formed so as to have a thickness of 30 μm using the composition described in (1). Then, the magnetic recording medium for bonding was cut into a predetermined width to produce a magnetic label tape.

(A: Composition for Magnetic Recording Layer) 40 parts of magnetic powder A {barium ferrite based, coercive force 53.2 (kA / m)} vinyl chloride based resin 4 parts (manufactured by ZEON CORPORATION, “MR-110”) )) Polyurethane resin 4 parts (manufactured by Dainippon Ink and Chemicals, "T-5206") Isocyanate-based curing agent 3 parts (Nippon Polyurethane Co., Ltd. "Coronate L") MEK 20 parts Toluene 20 parts Cyclohexanone 9 parts

(B: Composition for Colored Layer 1) Aluminum powder 20 parts Vinyl chloride-vinyl acetate copolymer resin 10 parts (manufactured by Union Carbide Co., Ltd., “VAGH”) MEK 35 parts Toluene 25 parts Ethyl acetate 10 parts

(C: Composition for Colored Layer 2) Titanium oxide 20 parts Vinyl chloride-vinyl acetate copolymer resin 10 parts (manufactured by Union Carbide Co., Ltd., “VAGH”) MEK 35 parts Toluene 25 parts Ethyl acetate 10 parts

(D: Composition for protective layer) Acrylic resin 16 parts (“KU-273” manufactured by Dainippon Ink and Chemicals, Inc.) Talc pigment 8 parts (“# 5000 PJ” manufactured by Matsumura Sangyo Co., Ltd.) Isocyanate-based curing agent 2 (D-750 manufactured by Dainippon Ink and Chemicals, Inc.) MEK 37 parts Toluene 37 parts

(E: Composition for pressure-sensitive adhesive layer) Alkyl phenol resin 6 parts ("Tamanol 100S", manufactured by Arakawa Chemical Industry Co., Ltd.) Acrylic ester / acrylic acid / vinyl acetate copolymer resin 67 parts (Seiden Chemical Industry Co., Ltd.) (Saipanol SD-102), Toluene 26 parts Isocyanate-based curing agent 1 part (Nippon Polyurethane Co., Ltd. "Coronate L")

Next, the magnetic label tape was adhered to a bankbook substrate (“Magnaprene 702”, manufactured by Dynic Corporation), and then heated and pressed at a temperature of 110 ° C. and a pressure of 0.1 MPa for 2 seconds. A passbook substrate with a magnetic stripe was prepared. Thereafter, the opposite side of the magnetic stripe-attached passbook substrate to which the magnetic stripe is attached and the placard PVC substrate are combined so that the magnetic stripe portion has a total thickness of 760 μm,
By punching to a desired size, a sample for measuring the output of the passbook with a magnetic stripe of the present invention having a thickness of the nonmagnetic layer on the magnetic recording layer of 10 μm was prepared.

Example 2 In Example 1, the residual magnetic flux density of the magnetic recording layer of the magnetic label tape was φr1.55.
A magnetic label tape was prepared in the same manner as in Example 1 except that the magnetic recording layer was coated in the same manner as in Example 1. An output measurement sample of the present invention in which the thickness of the upper nonmagnetic layer was 10 μm was prepared.

(Example 3) In Example 1, the residual magnetic flux density φr of the magnetic recording layer of the magnetic label tape was 1.70.
To 1.80 (μWb / m), and a magnetic label tape was prepared in the same manner as in Example 1 except that the magnetic recording layer was coated in the same manner as in Example 1. An output measurement sample of the present invention in which the thickness of the upper nonmagnetic layer was 10 μm was prepared.

(Example 4) In Example 1, the colored layer 2
Is formed, a protective layer is formed, and otherwise the thickness of the nonmagnetic layer on the magnetic recording layer is 6 μm in the same manner as in Example 1.
Of the present invention was prepared.

(Example 5) In Example 2, the colored layer 2
Is formed, a protective layer is formed, and otherwise the thickness of the nonmagnetic layer on the magnetic recording layer is 6 μm in the same manner as in Example 2.
Of the present invention was prepared.

(Example 6) In Example 3, the colored layer 2
Is formed, a protective layer is formed, and otherwise the thickness of the non-magnetic layer on the magnetic recording layer is 6 μm in the same manner as in Example 3.
Of the present invention was prepared.

(Example 7) In Example 1, the composition for the magnetic recording layer of the magnetic label tape was made of the following composition f, and the residual magnetic flux density φr after drying the magnetic recording layer was 1.45 to 1.5.
The magnetic recording layer was formed to a thickness of 5 (μWb / m), and a sample for output measurement was formed in the same manner as in Example 1 except that the thickness of the nonmagnetic layer on the magnetic recording layer was 10 μm. .

(F: Composition for Magnetic Recording Layer) 40 parts of magnetic powder B {barium ferrite based, coercive force 52.7 (kA / m)} vinyl chloride based resin 4 parts (manufactured by ZEON CORPORATION, “MR-110 )) Polyurethane resin 4 parts (manufactured by Dainippon Ink and Chemicals, "T-5206") Isocyanate-based curing agent 3 parts (Nippon Polyurethane Co., Ltd. "Coronate L") MEK 20 parts Toluene 20 parts Cyclohexanone 9 parts

(Example 8) In Example 7, magnetic recording was performed so that the residual magnetic flux density φr after drying the magnetic recording layer of the magnetic label tape was 1.55 to 1.65 (μWb / m). A layer was formed, and in the same manner as in Example 7, an output measurement sample having a nonmagnetic layer on the magnetic recording layer having a thickness of 10 μm was prepared.

(Example 9) In Example 7, magnetic recording was performed so that the residual magnetic flux density φr after drying the magnetic recording layer of the magnetic label tape was 1.70 to 1.80 (μWb / m). A layer was formed, and in the same manner as in Example 7, an output measurement sample having a nonmagnetic layer on the magnetic recording layer having a thickness of 10 μm was prepared.

(Example 10) In Example 7, the protective layer was formed without forming the colored layer 2, and the thickness of the nonmagnetic layer on the magnetic recording layer was reduced in the same manner as in Example 7 except for the above. 6μ
m of output measurement samples were prepared.

(Example 11) In Example 8, the protective layer was formed without forming the colored layer 2, and the thickness of the nonmagnetic layer on the magnetic recording layer was reduced in the same manner as in Example 8 except for the above. 6μ
m of output measurement samples were prepared.

(Example 12) In Example 9, the protective layer was formed without forming the colored layer 2, and the thickness of the nonmagnetic layer on the magnetic recording layer was reduced in the same manner as in Example 9 except for the above. 6μ
m of output measurement samples were prepared.

(Example 13) In Example 1, the following g composition was used for the magnetic recording layer of the magnetic label tape.
The residual magnetic flux density φr after drying the magnetic recording layer is 1.45 to 1.
A magnetic recording layer was formed to a thickness of 55 (μWb / m), and a sample for output measurement having a nonmagnetic layer thickness of 10 μm on the magnetic recording layer was prepared in the same manner as in Example 1 except for the above. .

(G: Composition for Magnetic Recording Layer) 40 parts of magnetic powder C {barium ferrite-based, coercive force 53.0 (kA / m)} 4 parts of vinyl chloride-based resin (manufactured by Zeon Corporation, "MR-110") )) Polyurethane resin 4 parts (manufactured by Dainippon Ink and Chemicals, "T-5206") Isocyanate-based curing agent 3 parts (Nippon Polyurethane Co., Ltd. "Coronate L") MEK 20 parts Toluene 20 parts Cyclohexanone 9 parts

(Example 14) In Example 13, the residual magnetic flux density φr after drying the magnetic recording layer of the magnetic label tape was measured.
Is 1.55 to 1.65 (μWb / m), except that the thickness of the nonmagnetic layer on the magnetic recording layer is 10 μm An output measurement sample was prepared.

(Example 15) In Example 13, the residual magnetic flux density φr after drying the magnetic recording layer of the magnetic label tape was measured.
Of the non-magnetic layer on the magnetic recording layer was formed in the same manner as in Example 13 except that the thickness of the non-magnetic layer was 10 μm. An output measurement sample was prepared.

(Example 16) In Example 13, a protective layer was formed without forming the colored layer 2, and otherwise the thickness of the nonmagnetic layer on the magnetic recording layer was reduced in the same manner as in Example 13. A 6 μm output measurement sample was prepared.

(Example 17) In Example 14, the protective layer was formed without forming the colored layer 2, and otherwise the thickness of the nonmagnetic layer on the magnetic recording layer was reduced in the same manner as in Example 14. A 6 μm output measurement sample was prepared.

Example 18 In Example 15, the protective layer was formed without forming the colored layer 2, and the thickness of the nonmagnetic layer on the magnetic recording layer was reduced in the same manner as in Example 15 except for the above. A 6 μm output measurement sample was prepared.

(Comparative Example 1) In Example 1, for the magnetic recording layer of the magnetic label tape, the composition of the following h was used, and the residual magnetic flux density φr after drying the magnetic recording layer was 1.45 to 1.5.
The magnetic recording layer was formed to a thickness of 5 (μWb / m), and a sample for output measurement was formed in the same manner as in Example 1 except that the thickness of the nonmagnetic layer on the magnetic recording layer was 10 μm. .

(H: Composition for Magnetic Recording Layer) 40 parts of magnetic powder D {barium ferrite type, coercive force 53.0 (kA / m)} 4 parts of vinyl chloride resin (manufactured by ZEON CORPORATION, “MR-110 )) Polyurethane resin 4 parts (manufactured by Dainippon Ink and Chemicals, "T-5206") Isocyanate-based curing agent 3 parts (Nippon Polyurethane Co., Ltd. "Coronate L") MEK 20 parts Toluene 20 parts Cyclohexanone 9 parts

Comparative Example 2 In Comparative Example 1, magnetic recording was performed so that the residual magnetic flux density φr after drying the magnetic recording layer of the magnetic label tape was 1.55 to 1.65 (μWb / m). A layer was formed, and in the same manner as in Comparative Example 1, an output measurement sample having a nonmagnetic layer on the magnetic recording layer having a thickness of 10 μm was prepared.

Comparative Example 3 In Comparative Example 1, magnetic recording was performed so that the residual magnetic flux density φr after drying the magnetic recording layer of the magnetic label tape was 1.70 to 1.80 (μWb / m). A layer was formed, and in the same manner as in Comparative Example 1, an output measurement sample having a nonmagnetic layer on the magnetic recording layer having a thickness of 10 μm was prepared.

(Comparative Example 4) In Comparative Example 1, the colored layer 2
Was formed, a protective layer was formed, and the other conditions were the same as in Comparative Example 1 except that the thickness of the nonmagnetic layer on the magnetic recording layer was 6 μm.
A sample for output measurement was prepared.

(Comparative Example 5) In Comparative Example 2, the colored layer 2
Was formed, a protective layer was formed, and otherwise the thickness of the non-magnetic layer on the magnetic recording layer was 6 μm as in Comparative Example 2.
A sample for output measurement was prepared.

(Comparative Example 6) In Comparative Example 3, the colored layer 2
Was formed, a protective layer was formed, and the other conditions were the same as in Comparative Example 3 except that the thickness of the nonmagnetic layer on the magnetic recording layer was 6 μm.
A sample for output measurement was prepared.

(Comparative Example 7) In Example 1, for the magnetic recording layer of the magnetic label tape, the following composition i was used, and the residual magnetic flux density φr after drying the magnetic recording layer was 1.45 to 1.5.
The magnetic recording layer was formed to a thickness of 5 (μWb / m), and a sample for output measurement was formed in the same manner as in Example 1 except that the thickness of the nonmagnetic layer on the magnetic recording layer was 10 μm. .

(I: Composition for Magnetic Recording Layer) 40 parts of magnetic powder E {CTX-970, manufactured by Toda Kogyo Co., gamma iron oxide coated with cobalt, coercive force 52.8 (kA / m)} Vinyl chloride Resin 4 parts (manufactured by Nippon Zeon, "MR-110") Polyurethane resin 4 parts (manufactured by Dainippon Ink and Chemicals, "T-5206" Isocyanate-based curing agent 3 parts (manufactured by Nippon Polyurethane Co., "Coronate L") MEK 20 parts Toluene 20 parts Cyclohexanone 9 parts

(Comparative Example 8) In Comparative Example 7, magnetic recording was performed so that the residual magnetic flux density φr after drying the magnetic recording layer of the magnetic label tape was 1.55 to 1.65 (μWb / m). A layer was formed, and in the same manner as in Comparative Example 7, an output measurement sample having a non-magnetic layer on the magnetic recording layer having a thickness of 10 μm was prepared.

(Comparative Example 9) In Comparative Example 7, magnetic recording was performed so that the residual magnetic flux density φr after drying the magnetic recording layer of the magnetic label tape was 1.70 to 1.80 (μWb / m). A layer was formed, and in the same manner as in Comparative Example 7, an output measurement sample having a nonmagnetic layer on the magnetic recording layer having a thickness of 10 μm was prepared.

(Comparative Example 10) In Comparative Example 7, the protective layer was formed without forming the colored layer 2, and the thickness of the nonmagnetic layer on the magnetic recording layer was reduced in the same manner as in Comparative Example 7 except for the above. 6μ
m of output measurement samples were prepared.

(Comparative Example 11) In Comparative Example 8, the protective layer was formed without forming the colored layer 2, and the thickness of the nonmagnetic layer on the magnetic recording layer was reduced in the same manner as in Comparative Example 8 except for the above. 6μ
m of output measurement samples were prepared.

(Comparative Example 12) In Comparative Example 9, the protective layer was formed without forming the colored layer 2, and otherwise the thickness of the nonmagnetic layer on the magnetic recording layer was changed in the same manner as in Comparative Example 9. 6μ
m of output measurement samples were prepared.

(Test Items and Results) For the output measurement samples obtained in Examples 1 to 18 and Comparative Examples 1 to 12, the "reproduction output" and "resolution" of the recording / reproduction characteristics and the "coercive force" of the magnetostatic characteristics were measured. "Hc", "squareness ratio", and "SFD" were determined by the following methods.

The recording and reproduction characteristics of the output measurement sample were measured using a model 6900 output measurement sample analyzer manufactured by Minato Electronics.

The average reproduction output (8 flux reversals / mm (200
For bpi)), recording and reproduction were performed under the following conditions, and the size was represented by the ratio to 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

For the resolution, the average reproduction output {20 flux reversal / mm (500 bpi)} was obtained under the following conditions, and the average reproduction output {8 flux reversal / mm (200 bp) of the above measurement was obtained.
i) Divide by｝ and calculate the result in (%). 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

The magnetostatic characteristics of the output measurement sample were measured using a VSM manufactured by Riken Denshi Co., Ltd., and the maximum applied magnetic field was 200 kA / m2.
(2513 Oersted), the orientation of the sample magnetic recording medium for output measurement was measured in the longitudinal direction, and the coercive force H was measured.
c "," Squareness ratio (Br / Bm) ", and" SFD ".

Further, as shown in FIG. 4, the SFD is 1/1 in the second quadrant on the measured hysteresis loop.
From H1 corresponding to 2Mr, H2 corresponding to 1/2 (-Mr) in the third quadrant, and Hc, it is obtained by the following equation. SFD = ｛| H2 | − | H1 |｝ / Hc

According to the definition of “identification card with front surface magnetic stripe”, the average reproduction output (200 bpi) is 80
% Or more and 130% or less and the resolution is required to be 70% or more.

Tables 1 and 2 show a list of the measurement results of the above Examples and Comparative Examples. Further, FIG. 5 is a graph of a part of the measurement results, and shows the relationship between the above-mentioned average reproduction output and the definition of the resolution.

Table 1.

[Table 1]

Table 2.

[Table 2]

When the total thickness of the non-magnetic layers such as the colored layer, the pattern layer, and the protective layer is 10 μm, which is larger than the conventional thickness, Tables 1 and 2
As shown in the results of the Examples and Comparative Examples and FIG. 5, in Comparative Example, even when φr was adjusted by changing the film thickness,
The required quality specified above cannot be satisfied. On the other hand, in the embodiment, it is shown that a region satisfying the required quality can be set by adjusting φr.

As described above, according to the present invention, it is possible to increase the thickness of the non-magnetic layers such as the colored layer, the pattern layer, and the protective layer formed on the magnetic recording layer. When the degree of freedom is increased, it becomes possible to produce a magnetic stripe for a passbook and a passbook having high design and excellent aesthetics.

[0158]

According to the present invention, a magnetic recording medium for lamination, which is processed into a magnetic label laminate with an adhesive layer and the like and formed on a non-magnetic substrate by a laminating step, or produced by the magnetic recording medium By defining the squareness ratio of the magnetic recording layer to be 0.88 or more and less than 1 and the SFD to be greater than 0 and 0.20 or less in the magnetic recording medium such as a passbook, the thickness of the nonmagnetic layer is 10 μm. Sometimes,
It is possible to provide a magnetic recording medium that realizes both the reproduction output and the resolution with high characteristic values. Since such a magnetic recording medium can completely cover the magnetic recording layer with a thick nonmagnetic layer, when used as a passbook magnetic stripe, it has a high degree of design freedom as a passbook and is extremely useful.

[Brief description of the drawings]

FIG. 1 is a schematic diagram of a passbook having a magnetic stripe.

FIG. 2 is a cross-sectional view of a magnetic label laminate for forming a passbook magnetic stripe, which is one of the pasting magnetic recording media.

FIG. 3 is a cross-sectional view of a passbook magnetic stripe portion when a magnetic stripe is formed on a passbook substrate by a sticking method using a magnetic label laminate having a magnetic recording layer.

FIG. 4 shows a method of calculating SFD from a hysteresis loop.

FIG. 5 is a graph showing the relationship between the average output and the resolution in Examples and Comparative Examples when the thickness of the nonmagnetic layer is 10 μm.

[Explanation of symbols]

 A Passbook with magnetic stripe B Magnetic stripe on passbook 1 Base for magnetic label laminate (base for bonding) 2 Magnetic recording layer 3 Colored layer (concealing layer) 4 Pattern layer (printing layer) 5 Protective layer 6 Adhesive layer (adhesive) Agent layer) 7 Release paper 8 Substrate for bankbook

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Tetsusu Miyahara 4-12-8-206 F Midorioka, Ageo-shi, Saitama F-term (reference) 2C005 HA11 HB09 JA02 KA06 KA15 KA52 KA61 5D006 AA05 AA06 BA06 BA19 DA00 DA01 DA06 FA09

Claims (11)

[Claims] In a magnetic recording medium in which an adhesive layer, a non-magnetic support, a magnetic recording layer, and a coloring layer are laminated in this order on a non-magnetic substrate, the square ratio of the magnetic recording layer is 0.88 or more and less than 1.
A magnetic recording medium characterized in that SFD is greater than 0 and 0.20 or less. 2. The magnetic recording medium according to claim 1, further comprising a protective layer on the coloring layer. 3. The magnetic recording medium according to claim 1, further comprising a pattern layer between the coloring layer and the protective layer. 4. A non-magnetic layer comprising a laminated structure including a magnetic recording layer formed on a non-magnetic substrate, wherein the non-magnetic layer completely covers the hue of the magnetic recording layer on the magnetic recording layer. Are laminated, the squareness ratio of the magnetic recording layer is 0.88 or more and less than 1, and the SFD is more than 0;
3. The laminated structure including a magnetic recording layer on a non-magnetic substrate having a thickness of 0.20 or less and formed by a laminating step of a laminated structure in a laminating magnetic recording medium. 3. The magnetic recording medium according to 3. 5. The magnetic recording medium according to claim 1, wherein the non-magnetic substrate is a booklet. 6. The magnetic recording medium according to claim 5, wherein the magnetic recording medium is for a passbook. 7. A laminating magnetic recording medium in which a magnetic recording layer and a coloring layer are laminated in this order on one surface of a non-magnetic support as a laminating substrate, and an adhesive layer is laminated on the other surface. ,
The squareness ratio of the magnetic recording layer is 0.88 or more and less than 1 and SF
D is greater than 0 and 0.20 or less. 8. The bonding magnetic recording medium according to claim 7, further comprising a protective layer on the colored layer. 9. The bonding magnetic recording medium according to claim 8, further comprising a pattern layer between the coloring layer and the protective layer. 10. The magnetic recording medium according to claim 1, wherein a hexagonal ferrite magnetic material is used as the magnetic powder in the magnetic recording layer.
3. The magnetic recording medium according to 3, 4, 5, 6, 7, 8, or 9. 11. The coercive force Hc of the magnetic recording layer is 47.7 kA.
/ M (600 Oersted) or more, 55.7 kA / m
11. The magnetic recording medium according to claim 1, wherein the magnetic recording medium is equal to or less than (700 Oersteds).