JP4492463B2 - Magnetic recording medium and method for manufacturing magnetic recording medium - Google Patents

Description

  The present invention provides a magnetic recording medium having a pattern formed by laminating a plurality of layers including a base layer and a magnetic recording layer, and having a pattern that can be identified from the magnetic reading side of the magnetic recording layer, a method for manufacturing the magnetic recording medium, and the magnetic The present invention relates to a transfer laminate used in a method for producing a recording medium. In particular, a card-like magnetic recording medium in which a layer including a magnetic recording medium layer is laminated on a base material layer for a card, such as a credit card or a bank card, and the magnetic stripe portion has a pattern that can be identified from the magnetic reading side. The present invention relates to a formed magnetic recording medium, a method for manufacturing the magnetic recording medium, and a transfer laminate used in the method for manufacturing the magnetic recording medium.

In recent years, various patterns have been formed on various magnetic recording media for practical or design purposes.
In particular, in magnetic cards that require high designability, such as credit cards and bank cards, it is important to provide high designability, and a colored layer has been provided on the magnetic stripe formed on the card base. In addition, there are known color-colored magnetic stripes that completely hide the black and brown color derived from the magnetic powder inherent in the magnetic recording layer, and in recent years on the magnetic recording layer or on the colored layer provided on the magnetic recording layer. Furthermore, a magnetic stripe with a pattern in which a pattern is formed is also produced.
In order to form this magnetic stripe with a pattern, as shown in FIG. 11B, a peeling layer and a protective layer or a protective layer having a peeling function are formed on a temporary transfer support, and the pattern is formed on the peeling layer. After formation, a colored layer, a magnetic recording layer, and a heat-sensitive adhesive layer that conceal the hue of the magnetic recording layer are sequentially formed to produce a laminate, and the laminate is cut to a desired width to form a magnetic stripe A laminate for transfer is obtained.
The transfer material of the transfer laminate for magnetic stripe formation obtained in this way is transferred to the oversheet of the card base, and heat-pressed together with the center core and the oversheet on the opposite side, and the magnetic stripe is formed on the oversheet. A magnetic stripe card with a pattern embedded with a transfer material is obtained (see FIG. 1).

However, since the magnetic stripe with a pattern formed in this way is located on the magnetic recording reading side of the magnetic recording layer, the magnetic head and the magnetic head during recording / reproduction are recorded in the pattern portion and the non-pattern portion. Since the spacing, which is the distance to the recording layer, changes, the reproduction output fluctuates, and as a result, there is a tendency to increase the possibility of errors when reading information.
As a method of eliminating the step between the pattern part and the non-pattern part by forming the pattern, a method of filling the non-pattern part space by using the negative pattern of the pattern part so as to fill the non-pattern part space is disclosed. (See Patent Document 1). And by making the colored layer (hiding layer) formed on the entire upper part of the pattern part and the space filling ink applied to the concave part of the non-pattern part have the same hue, printing of the negative pattern on the non-pattern part is conspicuous Without it, the effect of the ink for filling can be increased. However, although this method has a certain effect of suppressing the output fluctuation caused by the level difference, it is not perfect, and a new coating process for filling the non-picture part is required, so that a reduction in production efficiency is inevitable. It was.

In response to these problems, a magnetic tape manufacturing method has been proposed in which a concealing layer and a resin coating layer that can be dyed with a disperse dye are formed on a magnetic recording layer, and the resin coating layer is dyed with a sublimable disperse dye. (See Patent Document 2). However, although this method can prevent the formation of irregularities due to the formation of a pattern, it is necessary to form a resin coating layer for dye fixing in addition to the concealing layer. In general, sublimation dyes are difficult to achieve both good sublimation and stability, and the weather resistance and stability over time of the formed pattern are not necessarily sufficient. Furthermore, in this method, after forming a pattern with a sublimation dye on the resin coating layer, which is the outermost layer, a protective layer is further formed thereon, so that it is not possible to perform lamination at a time in the transfer step. A process is divided and manufacturing efficiency falls.
On the other hand, as a special pattern, in magnetic cards such as credit cards and bank cards where security is important, as a means of preventing counterfeiting, a pattern is provided on the magnetic recording layer using infrared ink or a fluorescent agent. Are known. It is important that these patterns cannot be identified visually, and the formation position and presence of the pattern are concealed and can be identified only by using a specific light source or detector. However, when a level difference occurs depending on the pattern, the security is deteriorated as shown below.
For example, as described above, a fluorescent pattern using a fluorescent agent cannot be visually recognized by ultraviolet rays contained in sunlight or indoor light, but must be visible as a fluorescent pattern for the first time by ultraviolet irradiation by a dedicated ultraviolet irradiation device. Thus, the authenticity of the card is determined.
For this reason, a concealing layer is formed on the area where the fluorescent pattern is formed, and the fluorescent pattern is recognized only when a strong ultraviolet ray is irradiated by a dedicated irradiation device (see Patent Document 3). .

However, the film thickness of these concealing layers is usually a thin film of several μm or less in order to suppress a decrease in reproduction output. For this reason, it was difficult to completely eliminate the steps of the fluorescent pattern. Therefore, even if the fluorescent pattern cannot be visually recognized by sunlight, room light, etc., due to the concealment layer, a step that is formed by the fluorescent pattern and cannot be completely eliminated remains, and the presence of the pattern is visually recognized by the reflected light. There was an inconvenience. Further, such a remaining step causes a fluctuation in reproduction output, which causes a problem that the signal quality is lowered.
In order to solve such problems, as a method of manufacturing a magnetic card having a pattern using a fluorescent agent, a release layer, an overcoat layer, a pattern printing layer, a concealing layer, and a fluorescent pattern are formed on a temporary transfer support. A manufacturing method is described in which each layer is sequentially laminated like a region to form a transfer material for forming a magnetic stripe, and this is transferred onto a card substrate on which a magnetic recording layer has been formed in advance through a transfer step. (See Patent Document 4). According to this method, when the ink in the fluorescent pattern forming region formed on the masking layer appropriately permeates the masking layer, the fluorescent agent that has permeated the masking layer after the transfer receives ultraviolet rays and emits light. For this reason, fluorescence is not shielded by the concealing layer, and a step due to the pattern formed by the fluorescent agent does not occur. However, the selection of the ink composition and the resin composition of the concealing layer for appropriately penetrating the fluorescent agent into the concealing layer must be performed with a delicate balance. Insufficient emission intensity is likely to occur. In addition, the choice of ink and resin is restricted, and the degree of freedom in design is restricted.

Further, the conventional method for manufacturing a magnetic recording medium with a pattern in which a pattern is formed on a magnetic stripe portion through a transfer process has the following disadvantages. That is, the printing of the pattern to be formed on the transfer laminate is usually carried out after the formation of the release layer, the protective layer or the protective layer having a release function on the transfer substrate, and then the colored layer, the magnetic recording layer, the heat sensitive layer. Each layer of the adhesive layer is sequentially laminated. That is, the pattern printing must be performed in the initial stage of the manufacturing process of the transfer laminate for forming the magnetic stripe, and more processes and time are required after the pattern is determined and manufactured. A transfer laminate is produced. Therefore, if it is necessary to correct the pattern after the transfer laminate for forming the magnetic stripe with the pattern is completed, it is not possible to correct the pattern in a short time, and the pattern correction is greatly delayed. It causes a decrease in efficiency.
As described above, when a pattern is formed on the magnetic recording layer of the magnetic recording medium, there are many cases in which the signal characteristics are lowered or the function of the original pattern cannot be sufficiently performed as the design is increased.
Moreover, it cannot be said that the production efficiency of the magnetic recording medium with a conventional pattern is good.

JP 59-168933 A JP 2000-155937 A JP 2000-002160 A JP-A-9-309287

An object of the present invention is to have a pattern that is identifiable from the surface on the magnetic recording reading side of a magnetic recording medium and has good stability over time, and no step is generated in the pattern forming portion as the pattern is formed. It is an object of the present invention to provide a magnetic recording medium that does not cause fluctuations in reproduction output caused by a step or an obstacle to a function that the picture should perform originally.
Furthermore, an object of the present invention is a method of manufacturing a magnetic recording medium for producing a magnetic recording medium having a pattern identifiable from the surface on the magnetic recording reading side through a transfer process, since no step is generated in the pattern forming portion. By providing a method for manufacturing a magnetic recording medium that does not fluctuate in reproduction output, has good manufacturing efficiency, and has a short process from the formation of a pattern to the production of a magnetic recording medium. is there.
A further object of the present invention is a transfer laminate used in the transfer step, which has a pattern that can be identified from the surface on the magnetic recording layer side, and a step is formed in the pattern formation portion by the formation of the pattern. It is an object of the present invention to provide a transfer laminate that can efficiently produce a magnetic recording medium having no magnetic recording medium.

The present invention has a pattern formed by a pattern forming agent in a laminate formed of a plurality of layers including a base layer and a magnetic recording layer, and the pattern has a direction opposite to the base layer of the laminate. The pattern forming agent is distributed in the film thickness direction of the laminate, and the central portion of the magnetic recording layer is located in a region on the reading side from the central portion of the magnetic recording layer in the laminate. There is provided a magnetic recording medium characterized by having a region having a concentration gradient that gradually decreases in the direction from the magnetic recording reading side to the magnetic recording reading side.
The present invention also has at least one magnetic recording layer on the temporary transfer support, and a pattern is formed on the surface of the magnetic recording layer opposite to the surface in contact with the temporary transfer support by a pattern forming agent. Form the formed transfer material,

Next, a transfer body is formed by transferring the transfer material from the temporary transfer support onto the base material layer,
Thereafter, the laminated body has a region having a concentration gradient gradually decreasing from the central portion of the magnetic recording layer toward the magnetic recording reading side in a region on the reading side from the central portion of the magnetic recording layer in the laminated body. By diffusing the pattern former as
In a laminate formed by a plurality of layers including a base layer and a magnetic recording layer, the laminate has a pattern formed by a pattern forming agent, and the pattern is from the surface of the laminate opposite to the base layer. The pattern forming agent is distributed in the film thickness direction of the laminate, and the magnetic recording layer from the central portion of the magnetic recording layer in the reading side region from the central portion of the magnetic recording layer in the laminate. There is provided a method of manufacturing a magnetic recording medium, characterized in that the magnetic recording medium is distributed with a region having a concentration gradient that gradually decreases in a reading side direction.

Furthermore, the present invention has at least one magnetic recording layer on the temporary transfer support, and a pattern is formed on the surface of the magnetic recording layer opposite to the surface in contact with the temporary transfer support by a pattern forming agent. Form the formed transfer material,
Thereafter, in the region of the transfer material from the center of the magnetic recording layer to the transfer temporary support side interface of the magnetic recording layer in the transfer material, the transfer material extends from the center of the magnetic recording layer to the transfer temporary support side interface of the magnetic recording layer. After diffusing the pattern former to have a region with a concentration gradient that gradually decreases in the direction,
By forming a laminate by transferring the transfer material from a temporary support for transfer onto a base material layer,
In a laminate formed by a plurality of layers including a base layer and a magnetic recording layer, the laminate has a pattern formed by a pattern forming agent, and the pattern is from the surface of the laminate opposite to the base layer. The pattern forming agent is distributed in the film thickness direction of the laminate, and the magnetic recording layer from the central portion of the magnetic recording layer in the reading side region from the central portion of the magnetic recording layer in the laminate. There is provided a method of manufacturing a magnetic recording medium, characterized in that the magnetic recording medium is distributed with a region having a concentration gradient that gradually decreases in a reading side direction.

Furthermore, the present invention forms a transfer material having at least one magnetic recording layer on a temporary transfer support,
Next, a laminate is formed by transferring the transfer material onto the pattern of the base material layer on which the pattern is formed by the pattern forming agent,
Thereafter, the laminated body has a region having a concentration gradient gradually decreasing from the central portion of the magnetic recording layer toward the magnetic recording reading side in a region on the reading side from the central portion of the magnetic recording layer in the laminated body. By diffusing the pattern former as
In a laminate formed by a plurality of layers including a base layer and a magnetic recording layer, the laminate has a pattern formed by a pattern forming agent, and the pattern is from the surface of the laminate opposite to the base layer. The pattern forming agent is distributed in the film thickness direction of the laminate, and the magnetic recording layer from the central portion of the magnetic recording layer in the reading side region from the central portion of the magnetic recording layer in the laminate. There is provided a method of manufacturing a magnetic recording medium, characterized in that the magnetic recording medium is distributed with a region having a concentration gradient that gradually decreases in a reading side direction.
Furthermore, the present invention provides a transfer laminate comprising a transfer temporary support having a magnetic recording layer and a transfer material having a pattern formed with a pattern forming agent on the magnetic recording layer. provide.

In the magnetic recording medium of the present invention, the pattern forming agent for forming a pattern is distributed in the film thickness direction of the laminate, and in the area on the magnetic recording reading side from the center of the magnetic recording layer in the laminate, The magnetic recording layer is distributed with a region having a concentration gradient that gradually decreases from the center of the magnetic recording layer toward the magnetic recording reading side. As in normal magnetic recording media with a pattern, the pattern forming agent does not exist at a high concentration in a specific area on the magnetic recording layer or does not localize. There is no fluctuation in the reproduction output due to the step.
According to the method for producing a magnetic recording medium of the present invention, the pattern forming agent for the pattern formed on either or both of the magnetic recording layer of the transfer material having the magnetic recording layer and the substrate is based on the transfer material. Before or after the step of transferring onto the material to form a laminate, the center of the magnetic recording layer is diffused in the transfer material, and in the region on the reading side from the center of the magnetic recording layer in the laminate From the surface of the laminated body, it is distributed with a region having a concentration gradient that gradually decreases in the direction from the reading side to the magnetic recording side. For this reason, a step corresponding to the pattern forming portion does not occur, and a reproduction output fluctuation due to the step does not occur.

Since the transfer laminate of the present invention has a magnetic recording layer and a pattern formed on the magnetic recording layer on the temporary transfer support, the pattern is transferred between the magnetic recording layer and the substrate after transfer to the substrate. Will be located. And by the diffusion of the pattern forming agent before or after the transfer, the pattern forming agent is distributed in the film thickness direction of the laminate, and in the region on the reading side from the center of the magnetic recording layer in the laminate, It is distributed with a region having a concentration gradient that gradually decreases from the center of the magnetic recording layer toward the magnetic recording reading side. For this reason, a step corresponding to the pattern forming portion does not occur, and a reproduction output fluctuation due to the step does not occur.
Furthermore, according to the method for producing a magnetic recording medium of the present invention, the region where the pattern is formed can be set in the transfer material of the transfer laminate and on the magnetic recording layer or on the substrate. It can be formed separately from the final stage of the production process of the laminate or the laminate for transfer. For this reason, parts other than the picture of the laminate for transfer can be prepared in advance, the picture can be formed at the final stage after the picture is confirmed, and the process from picture formation to card production can be shortened, so the picture can be changed Can also respond quickly.
Furthermore, the pattern or fluorescent pattern formed in the method for producing a magnetic recording medium of the present invention basically uses the colorant or the fluorescent agent that has been conventionally used when forming a pattern on the magnetic recording medium. can do. For this reason, at least the same pattern stability, light resistance and weather resistance as in the conventional production method can be obtained. Furthermore, since the pattern of the magnetic recording medium manufactured by the manufacturing method of the present invention is diffused and held inside the layer constituting the transfer material, it can be directly exposed to light from the outside or mechanical contact. And good pattern stability, durability, weather resistance, and light resistance.

Hereinafter, the present invention will be described in detail.
The magnetic recording medium of the present invention has a pattern formed by a pattern forming agent in a laminate formed by a plurality of layers including a base layer and a magnetic recording layer, and the pattern is the base of the laminate. It is distinguishable from the surface opposite to the material layer.
The base material layer of the present invention has a sheet shape or a plate shape, and examples of the material include plastics such as vinyl chloride, nylon, cellulose diacetate, and polyethylene terephthalate, papers such as synthetic paper, cloth paper, and the like. A composite of these materials can be used, but other than these materials can be used without particular limitation as long as the material has strength and rigidity necessary for forming a laminate.
As the pattern forming agent used in the present invention, various commonly used materials can be used as materials for forming various patterns formed on a magnetic recording medium for imparting functionality, design, etc. . They may be those that form visually identifiable patterns such as colorants and night paint materials, and can be identified by the use of light sources and detectors such as fluorescent materials and infrared ink materials. A pattern may be formed. Or you may form the pattern which becomes distinguishable using the element, compound, etc. which can be detected for the first time using a specific detection apparatus.
When a fluorescent agent is used as the pattern forming agent in the magnetic recording medium of the present invention, the fluorescent agent is distributed in the thickness direction of the magnetic recording medium, and the magnetic recording layer is located in the reading side region from the center of the magnetic recording layer. Are distributed with a region having a concentration gradient that gradually decreases from the center of the magnetic recording medium toward the magnetic recording reading side. For this reason, a fluorescent agent does not localize on the surface layer part of a magnetic card, for example, and a level | step difference does not arise in the place which provided the pattern as mentioned above. Therefore, even if a concealing layer that covers the surface layer portion is not particularly provided, it is not possible to identify the presence of the fluorescent pattern itself and its corresponding location and contents by sunlight or room light without ultraviolet irradiation. Therefore, it is possible to prevent the forgery prevention information and the identification information from being easily known from the print location and the print contents.

In the present invention, the pattern forming agent is distributed in the film thickness direction of the laminate, and the pattern forming agent is a central portion of the magnetic recording layer in a region on the reading side from the central portion of the magnetic recording layer in the laminate. Are distributed with a region having a concentration gradient that gradually decreases in the direction from the magnetic recording reading side to the magnetic recording reading side. In the present invention, the “magnetic recording / reading side” is the side on which a magnetic head for recording / reproducing contacts an assumed magnetic recording medium.
Such a distribution can be achieved by distributing the pattern forming agent on the magnetic recording layer with a high concentration near the surface layer of the laminate, or by using a local concentration near the surface layer of the laminate. In other words, it cannot be achieved by the method of forming a pattern by making it exist. Such a pattern forming agent distribution of the present invention can be formed, for example, by forming a pattern and then sequentially diffusing the pattern forming agent into adjacent layers by thermal diffusion, or when the pattern is laminated. It can also be formed by eroding adjacent layers with the solvent of the pattern forming paint. However, a method using thermal diffusion is preferable in terms of ease of control and freedom in selecting a resin for forming a pattern forming agent or a laminate. Thermal diffusion is basically isotropic, although there is a difference in diffusion speed depending on the layers that make up the laminate, and the design gradually increases from the region where the design was first formed to the direction of decreasing density in the laminate. The forming agent diffuses. Therefore, the distribution of the pattern forming agent in the laminate is roughly determined by the position in the laminate that forms the pattern.
In order to distribute the pattern forming agent having a region having a concentration gradient that gradually decreases from the center of the magnetic recording layer in the magnetic recording medium toward the magnetic recording reading side, the magnetic reading layer is sandwiched between the magnetic recording layers. A pattern may be formed on the interlayer or the magnetic recording layer located on the side opposite to the side direction. The pattern forming agent diffuses isotropically and forms a pattern that can be identified by the pattern forming agent diffused to the magnetic recording reading side. The pattern forming agent diffuses also in a direction perpendicular to the film thickness direction, but since the film thickness is thin, diffusion that causes the pattern to become unclear does not occur at the time of identifying the pattern.

  For example, in the manufacturing method of the present invention, a plurality of layers including a magnetic recording layer are formed on a temporary transfer support, and the opposite side of the temporary transfer support is sandwiched by the magnetic recording layer of the temporary transfer support. A pattern is formed with a pattern forming agent on the magnetic recording layer on the surface opposite to the surface in contact with the temporary support for transfer, or the transfer material is transferred from the temporary support for transfer onto the substrate. The laminated body is then formed, and then the laminated body gradually moves from the center of the magnetic recording layer to the reading side of the magnetic recording layer in a region in the laminated body from the center of the magnetic recording layer to the reading side. By diffusing the pattern forming agent so as to have a region having a decreasing concentration gradient, the pattern forming agent passes through the transfer material and diffuses in the direction toward the surface side of the transfer material after transfer. Are distributed in the film thickness direction of the transfer material, and the pattern is magnetic. Consisting direction of the recording reading side distinguishable state. The pattern forming agent does not localize on the card surface and does not cause a variation in spacing, which is the distance between the magnetic head and the magnetic recording layer, due to the formation of the pattern. Absent.

In the manufacturing method of the present invention, the transfer material may have a plurality of magnetic recording layers, and a pattern may be formed between the plurality of magnetic recording layers.
Furthermore, in the manufacturing method of the present invention, one or more layers other than the magnetic recording layer may be provided at a position opposite to the temporary transfer support with the magnetic recording layer interposed therebetween. A pattern may be formed between a layer and a layer other than the time recording layer, or between two or more layers other than the magnetic recording layer.
As a constituent component other than the magnetic recording layer and the pattern forming layer of the laminate formed on the substrate, a colored layer that conceals the hue of the magnetic recording layer can be formed on the magnetic reading side of the magnetic recording layer. Moreover, in order to make the adhesive force with a base material favorable when forming a laminated body through a transcription | transfer process, a heat-sensitive adhesive layer can be formed in the position which contact | connects a base material. Furthermore, in order to prevent the pattern forming agent from being exposed to the surface layer of the magnetic recording medium and adhering to other articles by contact, a pattern forming agent diffusion preventing layer can be used as the outermost layer on the magnetic reading side of the magnetic recording layer. .
In particular, it has a magnetic recording layer and a colored layer in this order on the substrate, and the pattern forming agent has a region having a concentration gradient that gradually decreases toward the recording reading side, and is distributed to the magnetic recording layer and the colored layer. Since the magnetic recording medium is identified with the background color of the colored layer, the distinctiveness and design are very high.

Further, the magnetic recording medium of the present invention forms a distinguishable pattern by diffusing the pattern forming agent from the center of the magnetic recording layer toward the magnetic recording reading side before or after the transfer of the transfer material. There is a need for a diffusion region where the agent diffuses and is identifiable. This region basically corresponds to a portion of the layer laminated in the laminated body toward the magnetic recording reading side of the pattern where the pattern forming agent can be diffused, so that the pattern in the thickness direction of the magnetic recording medium Depends on the formation location. The diffusion region may be a colored layer, or may be a colored layer, a magnetic recording layer, and a heat-sensitive adhesive layer. It is.
If the film thickness of the region is too thin, the pattern forming agent that can be held is insufficient, so that the pattern formation is not sufficiently performed, and the pattern forming agent that is suppressed in diffusion in the thickness direction is diffused in the lateral direction to cause the pattern to form. Prone to blur. On the other hand, if the film thickness of the region is too large, the diffusion region may be too wide and the picture may become unclear during diffusion in the magnetic recording reading direction from the surface to a position where it can be identified. Therefore, the total film thickness of the laminate positioned in the magnetic recording reading direction of the pattern corresponding to the diffusion region is preferably about 2 to 50 μm, excluding the film thickness of the pattern forming agent diffusion preventing layer described later, and 3 to 20 μm. The degree is further preferred.

In the present invention, the pattern can be formed at any position as long as it is a position between the magnetic recording layer and the substrate when the laminate is formed on the substrate. Therefore, when forming a laminated body through the transfer process, the pattern is laminated at an arbitrary position on the opposite side of the temporary transfer support with the magnetic recording layer sandwiched in the transfer material on the temporary transfer support. Can do.
However, the process of forming a pattern forming layer that is frequently changed in design is preferably at the last part of the process of making a laminate, for example when forming a pattern on the magnetic stripe of a magnetic card For example, it is formed on the heat-sensitive adhesive layer of the transfer laminate for forming a magnetic stripe after the heat-sensitive adhesive layer corresponding to the uppermost layer of the transfer material on the temporary transfer support, or magnetically formed. It is preferable that a pattern forming layer is formed on the substrate side to which the stripe is transferred. In this way, for example, by creating a transfer laminate for a solid magnetic stripe without printing a pattern in advance, as soon as the design of the magnetic card including the pattern of the magnetic stripe is determined, the uppermost layer of the transfer laminate or Since it is possible to print a pattern on a card substrate and to produce a card through a transfer process and a hot-pressing process, it is possible to manufacture a magnetic card on which a magnetic stripe with a pattern is formed in a short time from receiving an order.
As a method of diffusing the pattern formed in this way into the transfer material, the transfer material is heated in the state of a transfer laminate before transfer, or it is transferred to a substrate to form a magnetic recording medium and then heated. You can also. In particular, when the magnetic recording medium is a magnetic card, in the magnetic card manufacturing process, there is a process of laminating and integrating a plurality of card bases, magnetic stripes, etc. by a hot press at the final stage of the process. The pattern forming agent can be diffused in the pressing process. The conditions for diffusion of the pattern forming agent are the temperature, heating time, amount of the pattern forming agent used, etc., taking into account the ease of diffusion of the pattern forming agent, the type and Tg of the resin used in the laminate Can be adjusted as appropriate.

Below, the manufacturing method of the magnetic card | curd which has the magnetic stripe in which the pattern was formed as an example of the manufacturing method of the magnetic recording medium of this invention is demonstrated in detail.
As one embodiment of the magnetic recording medium manufacturing method of the present invention, a method of first forming a pattern on the side of a transfer material for forming a magnetic stripe will be described with reference to FIG. 2 and FIG. 9 which is a process diagram. Do. FIG. 2 is a cross-sectional view of a transfer laminate used in the production method of the present invention. Although the position in the transfer material where the pattern can be formed can also be a position adjacent to the magnetic recording layer, in FIG. 9, it is most advantageous in terms of production efficiency due to the small number of process constants from the pattern formation to card production. The case where a pattern is provided on a heat-sensitive adhesive layer is indicated. In this method, as shown in FIG. 2, after providing the pattern forming agent diffusion preventing layer 1 on the temporary transfer support 9, a colored layer 3 is further formed thereon, on which the magnetic recording layer 4 is further formed. The heat-sensitive adhesive layer 5 is laminated and applied to form a transfer laminate for a plain magnetic stripe. As soon as the pattern to be formed on the magnetic stripe is determined, the pattern is printed on the heat-sensitive adhesive layer of the transfer laminate to form a pattern, thereby producing a transfer laminate having a pattern forming function.
The pattern forming agent diffuses in the direction of the temporary transfer body of the transfer laminate corresponding to the reading direction of the magnetic recording after transfer by heating the transfer laminate (FIG. 9- (1)). For this reason, when it is peeled off from the temporary support for transfer and transferred onto the oversheet as the base material, it becomes a state that can be identified from the surface opposite to the base material of the transfer material, that is, the magnetic recording reading side surface. (See FIG. 3).
Alternatively, the pattern forming agent is transferred to the oversheet of the magnetic stripe transfer material and then combined with the center core and the oversheet on the opposite side of the center core to integrate the card substrate (FIG. 9). -(2)), the magnetic stripe transfer material is embedded in the oversheet, and at the same time, the pattern forming agent diffuses in the surface direction of the transfer material after transfer (magnetic recording reading side direction), and the formed pattern is It becomes distinguishable from the magnetic stripe surface. As described above, the pattern forming agent may be diffused only by the heat pressing process essential in the magnetic card manufacturing process, but at this time, the aging process (FIG. 9- (1)) in the state of the transfer laminate is also performed in advance. Is preferable because the pattern forming agent can be more reliably diffused.

Further, as another embodiment of the pattern forming method of the present invention, FIG. 4 and process chart 10 show a method for forming a pattern on the substrate side, that is, a portion where the magnetic stripe of the oversheet is transferred. This method is the same as the method shown in FIG. 9 up to the step of preparing a transfer laminate for a magnetic stripe having no pattern, but as soon as the pattern of the magnetic stripe is determined, the pattern is over-magnetic. A stripe is transferred to a portion to be transferred, and a magnetic stripe transfer material is transferred thereon. Thereafter, the oversheet is united with the center core, and a card press substrate is integrated with the oversheet on the opposite side of the center core to embed a transfer material for forming the magnetic stripe in the card substrate. The pattern forming agent of the pattern formed at this time can be discriminated from the surface of the magnetic stripe by diffusing to the surface direction of the transfer material transferred to the oversheet through the magnetic recording layer (diffusing to the magnetic recording reading side). .
The magnetic card manufactured in this way is, as shown in the cross-sectional view of the magnetic stripe portion (FIG. 5), from the oversheet 6 laminated on the center core 7, a pattern forming agent diffusion preventing layer that also serves as a protective layer. 1 is exposed on the card surface, and a laminate which is a transfer material for forming a magnetic stripe is embedded in the thickness direction of the colored layer 3, the magnetic recording layer 4 and the heat-sensitive adhesive layer 5 of the transfer material for forming the magnetic stripe. The pattern forming agent diffusion region 2 in which the pattern forming agent is diffused is provided. In this case, the pattern forming agent of the pattern 10 formed on the oversheet 6 in contact with the heat-sensitive adhesive layer 5 diffuses in the direction of the magnetic recording reading side of the embedded laminate, and gradually decreases. It has the area | region which has and is distributed in the surface direction. For this reason, the pattern can be identified from the pattern forming agent diffusion preventing layer 1 side.
The above method of directly forming a pattern on the oversheet side, which is a card base material, in advance can set the printing position accuracy of the pattern on the magnetic card higher than the other method of forming on the transfer laminate side. For this reason, it can be used suitably in the case of mass-producing a complicated pattern that requires accurate alignment between the pattern and the card substrate.

A magnetic card having a pattern on the magnetic stripe portion can be formed by the procedure as described above. However, the pattern forming method used in the method of manufacturing the magnetic recording medium of the present invention can be used at a place other than the magnetic stripe on the magnetic card. In addition, the present invention can also be applied to a magnetic recording medium other than a magnetic card, and also to a laminate having no magnetic recording layer. The pattern forming method in such a case can be dealt with by omitting the magnetic recording layer in the process diagrams of FIGS. 9 and 10, adding another layer, or replacing the magnetic recording layer with another functional layer. Can do.
Further, as described above, when a magnetic card is formed by using a transfer laminate for forming a magnetic stripe, only a part of the base material of the magnetic card is covered with the magnetic stripe. You may form the pattern over the card | curd whole surface using the laminated body for transfer which covers the whole surface of a material, and a transfer process.

Hereinafter, each structure of the transfer laminate used in the method for manufacturing a magnetic recording medium of the present invention will be described in further detail in the order of the manufacturing process.
A transfer laminate for forming a magnetic stripe, which is one of the embodiments of the transfer laminate of the present invention, is formed on the transfer substrate 9 as necessary, as shown in the cross-sectional configuration diagram of FIG. Produced by sequentially laminating a pattern forming agent diffusion preventing layer 1, a colored layer 3 formed as necessary, a magnetic recording layer 4 as an essential component, and a heat-sensitive adhesive layer 5 formed as necessary. Can do. And when providing a heat sensitive adhesive layer on a magnetic recording layer, it is preferable to form the pattern which gave the pattern printing 10 on the heat sensitive adhesive layer.

  In the transfer laminate used in the method for producing a magnetic recording medium in the present invention, any known and commonly used film can be used as a temporary transfer support. Examples thereof include polyesters such as polyethylene terephthalate, polyolefins such as polypropylene, cellulose derivatives such as cellulose triacetate, and other plastics such as polyamide. Of these, polyethylene terephthalate having both tensile strength and heat resistance is preferred. Moreover, there is no restriction | limiting in particular in the thickness of a transcription | transfer base film, Usually, 3-100 micrometers, Preferably it is 5-50 micrometers.

  In the transfer laminate used in the method for producing a magnetic recording medium in the present invention, a pattern forming agent diffusion preventing layer can be used. The pattern-forming agent diffusion prevention layer passes through the heat-sensitive adhesive layer, magnetic recording layer, colored layer, etc. by heating, and the pattern forming agent of the pattern diffused in the magnetic recording reading direction after forming the magnetic card further exceeds the outermost layer. To prevent diffusion. Further, in the transfer process of the transfer material for forming the magnetic stripe, the pattern forming agent is prevented from adhering to the metal plate for hot press. Furthermore, the pattern forming agent diffusion preventing layer functions as a protective layer for the entire transfer material. The pattern forming agent diffusion prevention layer is irradiated so that the pattern of the pattern forming agent that has diffused to just below the pattern formation agent diffusion prevention layer can be identified, or when the pattern is formed of a fluorescent agent, when visually observed It is preferable that it is substantially transparent to light, electron beam, etc. corresponding to the detection of the pattern so that it can transmit ultraviolet rays.

The binder resin constituting the pattern forming agent diffusion preventing layer is slightly different depending on the type of the pattern forming agent, but for example, cellulose resin, butyral resin, acrylic resin, polyurethane resin, polyester resin, vinyl chloride and vinyl acetate. Or a glass transition point from a vinyl chloride resin such as a copolymer added with vinyl alcohol, maleic anhydride or acrylic acid, an epoxy resin, a phenol resin, a melamine resin, etc. Those having a temperature higher than the heating temperature of the transfer laminate and the hot-pressing temperature when diffusing is preferably used. Further, since the diffusion path of the pattern forming agent is considered to be a molecular gap, it is preferable to add a curing agent such as a polyisocyanate compound to crosslink between the resin binder molecules in order to prevent diffusion, and the layer is empty. What does not contain the various fillers which are easy to produce a hole is preferable. Since the pattern forming agent diffusion preventing layer also functions as a protective layer, it is preferable to use a curing agent in terms of improving durability.
In particular, when a dye is used as the pattern forming agent, a hydrophilic resin having low compatibility and dyeability with the dye is preferable, and a resin used for the diffusion preventing layer of the sublimable dye can be preferably used. Furthermore, in view of adhesiveness with ordinary thermoplastic resins, heat resistance, and water resistance, cellulose resins are preferable, and among them, nitrocellulose and cellulose acetate are more preferable.

Furthermore, soybean lecithin, microsilica, wax or the like can be added as a film modifier to the pattern forming agent diffusion preventing layer as required.
Examples of the solvent used in the paint for the pattern forming agent diffusion preventing layer include ketones such as acetone, methyl ethyl ketone, and cyclohexanone, esters such as methyl acetate, ethyl acetate, and butyl acetate, alcohols such as ethanol, hexane, toluene, and xylene. These solvents can be used, and these solvents can be used in a mixture of two or more.

The pattern forming agent diffusion preventing layer can be obtained by applying the diffusion preventing layer coating material prepared as described above onto a temporary transfer support film for transfer by a known and commonly used method such as a reverse method, a gravure method, or a die coating method.
The dry film thickness of the pattern-forming agent diffusion prevention layer is better as it is recorded and recorded. However, if it is too thin, there may be holes that allow the pattern-forming agent to diffuse, which can sufficiently prevent the pattern-forming agent from spreading. Disappear. In consideration of balance with strength, durability, etc., 0.1 to 5 μm is preferable, and 0.3 to 2 μm is more preferable.

The transfer laminate used in the method for producing a magnetic recording medium of the present invention may have a colored layer (hiding layer). The colored layer contains a binder resin and a colorant as components, and conceals the hue of the adjacent magnetic recording layer and is colored by holding the pattern forming agent diffused in the colored layer in the colored layer. Since the hue of the layer is identified as the background, it is possible to easily identify the pattern and enhance the design.
Pigments used for the colorant include alumina, titanium oxide, chromium oxide, iron oxide, zinc oxide, barium sulfate and the like as inorganic pigments, and azo, phthalocyanine, quinacridone, perylene, anthraquinone, and the like as organic pigments. There are many types such as thioindigo and indanthrene, but there is no particular limitation. Moreover, it can replace with the said pigment or can also use together dyes, such as a phthalocyanine dye, an azo dye, a nitro dye, a quinoline dye, a methine dye, an azine dye, a fatalein dye.
In addition, scaly metal powder can also be used as a pigment that can effectively conceal the hue of the magnetic recording layer, and the metals include aluminum, gold, silver, copper, brass, titanium, chromium, nickel, nickel chromium, and stainless steel. Etc. can be used. The scaly metal powder is formed, for example, in a plate shape by a ball mill or the like, or formed by peeling a deposited thin film. As these shapes, the size in the plane direction is preferably 5 to 25 μm. More preferably, it is ˜15 μm. The thickness is about 0.1 to 1 μm.

As the binder resin used for the coating material for the colored layer, a known and commonly used binder resin can be used, and it can be thermally cured using an isocyanate compound. To facilitate the diffusion of the pattern former. For example, in addition to the binder resin described in the pattern formation agent diffusion prevention layer, the binder resin used for the colored layer among polyimide resin, polyamide resin, rosin-modified maleic acid resin, polystyrene resin, shellac, alkyd resin, etc. Those having a Tg lower than the temperature applied to the transfer material for the diffusion of the pattern forming agent can be suitably used.
Thus, the pattern forming agent for the pattern can be diffused through the colored layer in the magnetic recording reading direction, that is, in the surface direction of the transfer material after transfer. The speed and difficulty of diffusion vary depending on the type of resin used in the colored layer, but can be adjusted by appropriately selecting the temperature applied to the transfer material and the resin used in the colored layer.
As the solvent used for the coating material for the colored layer, known and commonly used solvents can be used. For example, the solvents already described in the protective layer can be used.
Formation of the colored layer is a known one such as a two-roll mill, a three-roll mill, a ball mill, a sand mill, a disper, etc., in which the colorant is used alone or in a solvent that dissolves the binder resin. It can be performed by dispersing by a conventional method to prepare a coating material for a colored layer, and applying and drying the coating by a known method such as a reverse method, a gravure coating method, a die coating method or the like.

  The colored layer is preferably thick in order to hide the brown or black color of the magnetic recording layer. However, if the thickness of the colored layer is too large, the spacing loss increases, the reproduction output characteristics deteriorate, and the possibility of occurrence of errors during information reading increases. Therefore, the thickness of the colored layer is preferably 2 to 5 μm, particularly 3 to 4 μm.

The magnetic recording layer of the transfer laminate used in the method for producing a magnetic recording medium of the present invention is, for example, a magnetic recording layer coating containing a magnetic powder, a binder resin, and a solvent that dissolves the binder resin. It can be formed directly on the support, or on the support through a pattern forming agent diffusion preventing layer, or further on the support through a colored layer.
As the magnetic powder contained in the magnetic recording layer, known magnetic powders such as γ-iron oxide, magnetite, cobalt-coated iron oxide, chromium dioxide, iron-based metal magnetic powder, barium ferrite, and strontium ferrite are used. be able to. Those having a coercive force in the range of 20 to 320 kA / m are preferred.
As the binder resin used for the magnetic recording layer, known and commonly used binder resins can be used. For example, generally, the binder resin described in the case of the colored layer can be used. It can also be thermally cured using an isocyanate compound. As the solvent used for the magnetic recording layer coating material, for example, the solvents described in the description of the protective layer can be used.
The pattern forming agent of the pattern forming layer can be diffused through the magnetic recording layer in the magnetic recording reading direction, that is, to the surface of the transfer material after transfer. Although the diffusion speed and the degree of difficulty vary depending on the type of resin, the temperature applied to the transfer material and the resin used for the magnetic recording layer can be appropriately selected and adjusted. In order to facilitate the diffusion of the pattern forming agent, the Tg of the binder resin used for the magnetic recording layer is preferably lower than the temperature applied to the transfer material.

If necessary, auxiliary agents such as surfactants, silane coupling agents, plasticizers, waxes, silicone oils, carbon black and other fillers can be added to the magnetic coating.
The magnetic recording layer coating is obtained, for example, by kneading and dispersing the above magnetic powder, binder resin, and solvent by a known and conventional method. Examples of the kneading and dispersing machine include a two-roll mill, a three-roll mill, and a ball mill. , Henschel mixer, Cobol mill, Sand mill, Disper, Homogenizer, Kneader, etc. can be used.
The coating method for the magnetic recording layer coating is not particularly limited, and a known and commonly used coating method may be used. After applying a predetermined amount of the magnetic coating, the easy magnetization direction of the magnetic powder is in the longitudinal direction of the magnetic recording layer coating. Then, the alignment treatment is performed and drying is performed. As a coating method, for example, a gravure method, a reverse method, a transfer roll coater method, a kiss coater method, a die coater method, or the like can be used.
In addition, after the application by the above application method, it is preferable from the viewpoint of recording / reproducing characteristics that the magnetic field orientation treatment is performed before the coating film is dried. As the magnetic field orientation method, a known method such as a repulsive counter permanent magnet, a solenoid electromagnet, or the like can be used. The magnetic field strength is preferably in the range of 1000 to 6000G.
The dry film thickness of the magnetic recording layer is preferably in the range of 2 to 50 μm, more preferably in the range of 5 to 20 μm.

In the transfer laminate used in the method for producing a magnetic recording medium of the present invention, a heat-sensitive adhesive layer can be used for the purpose of favorably bonding the transfer laminate and the card substrate. The heat-sensitive adhesive layer generally contains a resin exhibiting heat-sensitive adhesive properties. For example, a copolymer of vinyl chloride and vinyl acetate, or vinyl alcohol, maleic anhydride or acrylic acid is added. Examples thereof include a vinyl chloride resin such as a copolymer, a polyester resin, an acrylic resin, a polyimide resin, and a polyurethane resin.
Moreover, as a solvent used for a heat sensitive adhesive layer, the solvent described in the protective layer can be used, for example. The heat-sensitive adhesive layer is prepared by dissolving a resin exhibiting heat-sensitive adhesion in a solvent, mixing and stirring to prepare a heat-sensitive adhesive paint, and the adhesive paint is applied to the magnetic recording layer by a reverse method, a gravure method, a die coating method, or the like. It is obtained by applying and drying by the method of
The thickness of the heat-sensitive adhesive layer is preferably 0.5 to 15 μm, particularly preferably 0.5 to 5 μm.
The pattern forming agent can be diffused through the heat-sensitive adhesive layer in the magnetic recording reading direction, that is, the surface direction of the transfer material. The speed and difficulty of diffusion vary depending on the type of resin used in the heat-sensitive adhesive layer, but can be adjusted by appropriately selecting the temperature applied to the transfer material and the resin used in the magnetic recording layer. In order to facilitate the diffusion of the pattern forming agent, the Tg of the binder resin used for the heat-sensitive adhesive layer is preferably lower than the temperature applied to the transfer material.

The pattern formation in the transfer laminate used in the method for producing a magnetic recording medium of the present invention can be performed by printing using the following pattern forming ink when a colorant is used as the pattern forming agent. At this time, the pattern forming ink contains a binder resin, a colorant, and a solvent. As the colorant for the ink for forming a pattern, it is possible to select and use a known dye or pigment that can be easily diffused. However, a dye is preferred because of its ease of diffusion by heat. The well-known dye currently used by 1 can be used. Use of oil-soluble dyes such as monoazo, disazo, metal complex, anthraquinone, phthalocyanine, triallylmethane, and perylene is preferred. Although known sublimation dyes can also be used, since the diffusion of the pattern forming agent in the production method of the present invention can be performed over a sufficient temperature and time during the transfer process when producing a magnetic recording medium, Good sublimation for diffusion in a short time required for ordinary sublimable dyes is not always necessary. Rather, it is preferable to use a dye other than the sublimable dye in consideration of the stability of the colorant.
As the binder resin used for the pattern forming ink, known and commonly used binder resins can be used. For example, the resin used in the pattern forming agent diffusion preventing layer, the colored layer, the magnetic recording layer, the heat-sensitive adhesive layer, etc. may be mentioned, but the adhesion to the card oversheet base material is good and the resin is used on the heat-sensitive adhesive layer. A binder resin that does not hinder the adhesion of the heat-sensitive adhesive layer to the oversheet even when a pattern is formed on the surface is preferable, and the binder resin used for the heat-sensitive adhesive layer having good adhesion to the oversheet Can be suitably used.
As the solvent used in the pattern forming ink, known and commonly used solvents can be used. For example, the solvents already described in connection with the pattern forming agent diffusion preventing layer, the colored layer, the magnetic recording layer, and the heat-sensitive adhesive layer can be used.

The pattern forming ink is a two-roll mill, a three-roll mill, a ball mill, a sand mill or a two-roll mill, a three-roll mill, a ball mill, and a sand mill that are dissolved in a binder resin and a solvent that dissolves the binder resin. The ink for pattern formation is prepared by dispersing by a method using a known and common dispersing device such as a disper. For the printing of the pattern, known printing methods such as gravure printing, flexographic printing, offset printing, screen printing, and ink jet can be used. In particular, gravure printing is suitable from the viewpoint of printing quality and productivity.
The film thickness of the pattern printing is not particularly limited, but if the film thickness is too thick, the transfer material for forming the magnetic stripe is generally wound up in a reel shape, so the film thickness difference between the non-printing area and the printing area when winding up There is a possibility that the level difference caused by the above becomes large and the transfer material is deformed to deteriorate the adhesion between the transfer material for forming the magnetic stripe and the substrate. Therefore, the film thickness is preferably 0.5 to 5 μm, particularly preferably 0.5 to 2.0 μm.
In this way, the pattern forming ink is used to form, for example, a pattern on the heat-sensitive adhesive surface of the magnetic stripe transfer material or on the portion where the magnetic stripe on the card substrate side is transferred.

As a method for diffusing the pattern formed in this way into the transfer material, the transfer material is present on the temporary transfer support and left in a high temperature environment of 40 to 80 ° C. for several hours to several days before the transfer process. Then, the pattern forming agent can be diffused in advance to the transfer temporary support side so that it can be identified from the surface side opposite to the substrate of the transfer material after the transfer material is transferred. Or when producing a magnetic card using a hot-pressing process, after transferring a transfer material to the oversheet of a card base material, it inserts in a metal plate for hot-pressing with an oversheet on the surface opposite to the center core. Perform hot pressing for several tens of minutes to several hours at a temperature of ℃ to diffuse the pattern forming agent to the surface of the transfer material after transfer so that it can be identified from the surface of the magnetic card produced. .
When the pattern forming agent is a fluorescent agent, the method for producing a magnetic recording medium of the present invention can be performed by printing the following fluorescent pattern forming ink. The fluorescent pattern forming ink of the present invention contains a binder resin, a fluorescent agent and a solvent.
As the fluorescent agent for the fluorescent pattern forming ink, known organic fluorescent substances can be widely used. As specific organic fluorescent substances, fluorescent dyes such as benzoxazole thiophine, diaminostilbene, imidazole, coumarin, naphthalimide, and rare earth complexes are preferable because of their good diffusion. In addition, commercially available fluorescent substances include trade name UVITEX OB manufactured by Chiba Special Chemicals, trade name Kaylight OS manufactured by Nippon Kayaku Co., Ltd., trade name Thermoplast series, trade name Fluorol series, trade name Lumogen, manufactured by BASF. Series, product name Lumicolor manufactured by Recording Materials Research Laboratory Co., Ltd. can be used. The use of a fluorescent dye is preferred in terms of ease of diffusion.
The fluorescent pattern forming ink using the fluorescent agent can be manufactured in the same manner as the above-described pattern forming ink manufacturing method except that the fluorescent agent is used instead of the colored colorant. When using dyes and pigments for night paints and other functional paints for infrared paints as pattern forming agents formed with fluorescent agents, the above-mentioned colorants and fluorescent agents are used as dyes and pigments for these functional paints. A functional ink can be produced by replacing it, and a pattern can be formed on the magnetic recording medium.
As these pattern forming agents, for example, a colorant and a fluorescent agent may be used at the same time, or other functional inks may be used in combination.

The present invention will be described in more detail below using examples and comparative examples, but the present invention is not limited to the examples, and hereinafter, “parts” represents parts by mass.
An example using a colored dye as a colorant for a pattern forming agent and an example using a fluorescent dye are shown below.
In the Examples and Comparative Examples, the following temporary transfer support film and various coating materials are used.
A. Transfer temporary support film Polyethylene terephthalate film having a thickness of 24 μm Preparation of paint for anti-diffusion layer for pattern forming agent (also serving as protective layer) Cellulose acetate resin 8 parts ("L-20" manufactured by Daicel Chemical Industries, Tg: 187 ° C)
Cellulose acetate propionate resin 2 parts (Eastman Chemical "CAP-504-0.2" Tg: 159 ° C)
Acetone 25 parts Ethyl acetate 25 parts Toluene 20 parts Cyclohexanone 20 parts Polyisocyanate 4 parts ("Hardener No. 50" (active ingredient: 50%) manufactured by Dainippon Ink & Chemicals, Inc.)
Among the above materials, all except for the polyisocyanate are stirred with a disper and dissolved sufficiently, and then the above polyisocyanate is added, and further stirred and homogenized with a disper to provide a paint for a pattern forming agent diffusion prevention layer. Was made.

C. Preparation of paint for colored layer Flaky metal powder: 20 parts of aluminum powder ("210EA" manufactured by Showa Aluminum Powder Co., Ltd.)
16 parts of vinyl chloride-vinyl acetate copolymer resin (“VAGH” manufactured by Union Carbide, Tg: 79 ° C.)
4 parts of polyurethane resin (Dai Nippon Ink Chemical Co., Ltd. “TS-03” Tg: −30 ° C.)
Methyl ethyl ketone 75 parts Toluene 75 parts Cyclohexanone 17 parts Polyisocyanate 5 parts ("Hardener No. 50 (active ingredient: 50%)" manufactured by Dainippon Ink & Chemicals, Inc.)
Of the above materials, all except for the polyisocyanate were stirred and sufficiently dissolved with a disper, and then the above polyisocyanate was added and further stirred and homogenized with a disper to prepare a paint for a colored layer.

D. Production of coating material for magnetic recording layer 100 parts of barium ferrite magnetic powder ("MC-127" manufactured by Toda Kogyo Co., Ltd .; coercive force 220 kA / m)
15 parts of vinyl chloride-vinyl acetate copolymer resin (“MR-110” manufactured by Nippon Zeon Co., Ltd., Tg: 70 ° C.)
10 parts of polyurethane resin (“TS-03” manufactured by Dainippon Ink & Chemicals, Inc.)
MEK 50 parts Toluene 50 parts Cyclohexanone 25 parts Polyisocyanate 10 parts (“Hardener No. 50 (active ingredient: 50%)” manufactured by Dainippon Ink & Chemicals, Inc.)
Using the materials described above, a magnetic recording layer coating was prepared by the method described in JP-A-09-059541.

E. Preparation of paint for heat-sensitive adhesive layer Polyurethane resin 1 part (“TS-03” manufactured by Dainippon Ink & Chemicals, Inc.)
4 parts of vinyl chloride-vinyl acetate copolymer resin (“Solvine C5” manufactured by Nissin Chemical Co., Ltd., Tg: 68 ° C.)
MEK 45 parts Toluene 50 parts The above materials were stirred and sufficiently dissolved in a disper to homogenize, thereby preparing a heat-sensitive adhesive paint.

F. Preparation of picture forming ink [A] Amine salt of chromium complex dye 4 parts <C. I. Solvent Black 43>
("Eisenspiron Black GMH Special" manufactured by Hodogaya Chemical Co., Ltd.)
Polyurethane resin 2 parts ("TS-03" manufactured by Dainippon Ink & Chemicals, Inc.)
8 parts of vinyl chloride-vinyl acetate copolymer resin (“Solvine C5” manufactured by Nissin Chemical)
MEK 43 parts Toluene 43 parts The above materials were stirred and thoroughly dissolved in a disper to homogenize, and a pattern ink [A] was produced.

G. Preparation of pattern forming ink [B] Copper phthalocyanine dye <C. I. Solvent Blue 70> 4 parts
(BASF “Neozapon Blue 807”)
Polyurethane resin 2 parts ("TS-03" manufactured by Dainippon Ink & Chemicals, Inc.)
8 parts of vinyl chloride-vinyl acetate copolymer resin (“Solvine C5” manufactured by Nissin Chemical)
MEK 43 parts Toluene 43 parts The above materials were stirred and sufficiently dissolved in a disper to homogenize, and a pattern ink [B] was produced.

H. Preparation of ink for pattern formation [C] 10 parts of carbon black (“REGAL99R” manufactured by CABOT CORPORATION)
8 parts of vinyl chloride-vinyl acetate copolymer resin (“VAGH” manufactured by Union Carbide)
Polyurethane resin 2 parts ("TS-03" manufactured by Dainippon Ink & Chemicals, Inc.)
MEK 40 parts Toluene 40 parts Polyisocyanate 4 parts (“Hardener No. 50 (active ingredient: 50%)” manufactured by Dainippon Ink & Chemicals, Inc.)
Pre-kneaded meat was prepared with two rolls together with carbon black and vinyl chloride-vinyl acetate copolymer resin, and then passed through a sand mill together with other materials to produce a pattern ink [C].

I. Preparation of pattern forming ink [D] Copper phthalocyanine pigment 10 parts Vinyl chloride-vinyl acetate copolymer resin 8 parts ("VAGH" manufactured by Union Carbide)
Polyurethane resin 2 parts ("TS-03" manufactured by Dainippon Ink & Chemicals, Inc.)
MEK 40 parts Toluene 40 parts Polyisocyanate 4 parts (“Hardener No. 50 (active ingredient: 50%)” manufactured by Dainippon Ink & Chemicals, Inc.)
Preliminary meat was performed with a two-roll roll together with a copper phthalocyanine pigment and a vinyl chloride-vinyl acetate copolymer resin, and then passed through a sand mill with other materials to produce a pattern ink [D].

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

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

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

Examples and comparative examples using colored dyes as pattern forming agents are shown below.
Example 1
As a temporary support for transfer, a polyethylene terephthalate film having a thickness of 24 μm is used, and on the one side of this film, the above-mentioned paint forming agent diffusion preventing layer coating, colored layer coating, magnetic recording layer coating, and heat sensitive adhesive coating In this order, all were applied and dried using a reverse coater, and a pattern forming agent diffusion preventing layer, a colored layer, a magnetic recording layer, and a heat-sensitive adhesive layer were provided, respectively. The thickness of each layer after drying was adjusted to 1 μm for the pattern forming agent diffusion preventing layer, 4 μm for the colored layer, 9 μm for the magnetic recording layer, and 1.5 μm for the heat sensitive adhesive layer.
On the surface of the heat-sensitive adhesive layer of the prepared transfer material, pattern printing was performed by using a gravure printing method with a pattern ink [A] as shown in FIG. 6 so that the thickness of the pattern portion was 1 μm. Thereafter, it was left in a thermostatic chamber at 60 ° C. for 24 hours to diffuse the pattern colorant through the heat-sensitive adhesive layer, the magnetic recording layer, and the color layer toward the transfer substrate of the transfer laminate.
After the transfer material is cut into a predetermined width using the magnetic stripe-forming transfer laminate prepared above, a polyvinyl chloride card substrate oversheet (Taihei Chemical Co., Ltd.) using a heat seal tester (manufactured by Tester Sangyo Co., Ltd.) The transfer material was transferred. Thereafter, the temporary transfer support is removed, and a flat pressure press (test vulcanizing press (manufactured by Toyo Seiki Seisakusho)) is used together with an oversheet opposite to the card substrate center core at 140 ° C., 1. Heat press processing was performed under conditions of 3 MPa and 20 to 30 minutes, and punched into a card shape to produce a magnetic card FIG.

(Example 2)
A magnetic card was prepared in the same manner as in Example 1 except that the pattern forming ink was changed to the pattern forming ink [B] in the pattern printing of Example 1.
(Example 3)
In the pattern printing of Example 1, a magnetic card was prepared in the same manner as in Example 1 except that the transfer laminate for forming a magnetic stripe after pattern printing was not left in a high temperature chamber at 60 ° C. for 24 hours.
Example 4
In the pattern printing of Example 2, a magnetic card was produced in the same manner as in Example 2 except that the magnetic stripe-forming transfer laminate after pattern printing was not left in a high-temperature room at 60 ° C. for 24 hours.
(Example 5)
In Example 1, the magnetic stripe transfer material was prepared in the same manner as in Example 1. As shown in FIG. 7, pattern printing was performed on the portion where the magnetic stripe on the oversheet side, which is the card substrate, was transferred. It was carried out by a gravure printing method using the ink [A]. Thereafter, a magnetic card was produced in the same manner as the magnetic card production method of Example 1.
(Example 6)
A magnetic card was produced in the same manner as in Example 5 except that the pattern forming ink was changed to the pattern forming ink [B] in the pattern printing of Example 5.

(Comparative Example 1)
As a temporary support film for transfer, a polyethylene terephthalate film having a thickness of 24 μm was used, and the film thickness after drying the above-described paint forming agent diffusion preventing layer (protective layer) coating on one side of this film was 1 μm. Application and drying were performed using a reverse coater.
Thereafter, the pattern forming ink [C] was used to form a pattern by gravure printing so that the thickness of the pattern after drying was 1 μm. After that, using the gravure plate that becomes the negative pattern of the above pattern, the non-pattern part filling paint is applied to the part other than the pattern part formed with the pattern ink [C] so that the film thickness after drying becomes 1 μm. Printing was done to fit.
Thereafter, the color layer coating material, the magnetic recording layer coating material, and the heat-sensitive adhesive coating material were applied in this order using a reverse coater and dried, respectively, and the colorant diffusion preventing layer, coloring layer, magnetic recording layer, And a heat sensitive adhesive layer. The thickness of each layer after drying was adjusted to 4 μm for the colored layer, 9 μm for the magnetic recording layer, and 1.5 μm for the heat-sensitive adhesive layer.
After cutting the transfer laminate for magnetic stripe formation produced above to a predetermined width, it is used as an oversheet for card base made of polyvinyl chloride (made by Taihei Chemical Co., Ltd.) using a heat seal tester (made by Tester Sangyo Co., Ltd.). The transfer material was transferred, and the temporary transfer support was removed. Thereafter, the oversheet is used together with an oversheet opposite to the center core for the card substrate, using a flat pressure press (test vulcanizing press, manufactured by Toyo Seiki Seisakusho), 140 ° C., 1.3 MPa, 20-30. The magnetic card was made by hot pressing under the conditions of minutes and punching into a card shape.
(Comparative Example 2)
In Comparative Example 1, a magnetic card was prepared in the same manner as in Comparative Example 2 except that the pattern forming ink was changed to the pattern forming ink [D].
(Comparative Example 3)
A magnetic card was manufactured in the same manner as in Comparative Example 1 except that the non-pattern part was not filled with the non-pattern part filling paint in Comparative Example 1.

The magnetic cards of Examples 1 to 6 and Comparative Examples 1 to 3 were evaluated by the following evaluation methods.
(Pattern stability)
After storage for 1000 hours in a constant temperature layer at 60 ° C., the color development and shape change of the pattern of the magnetic card were observed. Regarding the magnetic card with a pattern produced in Examples 1 to 6, there was no change in the pattern, and both color development and shape were maintained.

(Creativity)
The magnetic stripe portion of the magnetic card was visually evaluated.
○: Both contrast and color development are good.
Δ: Contrast is unclear or color development is insufficient.
×: Contrast is unclear and color development is insufficient.

(Magnetic card output fluctuation)
By measuring the fluctuation of the reproduction output caused by the irregularities on the surface of the magnetic card, the step of the magnetic card as a laminate and the size of the irregularities were evaluated.
Based on ISO / IEC7811-6, the recording / reproduction characteristics of the obtained magnetic card were measured using MAGTESTER 2000 manufactured by BARNES, and the output fluctuation was determined by the following equation. For the magnetic stripe on the magnetic card used to make this magnetic card sample, the film thickness of the magnetic recording layer is adjusted according to each spacing so that the output average value becomes equal to the reference card output. Adjustments were made.
Output fluctuation (%) = ((maximum output value−minimum output value) / average output value) × 100
○: Less than 5%.
Δ: 5% or more and less than 10%.
X: 10% or more.
(Easy delivery and design change after design determination)
Shown in number of steps until card completion (see FIGS. 9, 10, and 11)
○: The number of processes from picture formation to card completion is as small as 4 or less, and it is possible to respond quickly to card delivery and design changes.
X: Since the number of processes from pattern formation to card completion is as large as 7 or more, it takes time to complete the card, so it is not possible to respond quickly to the card delivery date or the pattern change.
Δ: The number of steps from pattern formation to card completion is 5-6.
The results are shown in Table 1.

As is clear from the results in Table 1, Examples 1 to 6 can ensure the same designability as a magnetic card having a conventional pattern, and the dye used for the pattern printing is a magnetic recording layer or a colored layer. Since the gap portion is diffused and colored, the distance between the magnetic stripe surface and the magnetic recording layer is not substantially changed between the pattern portion and the non-pattern portion, and output fluctuation due to the pattern does not occur at all. In addition, since the number of steps from design determination to card completion is small, the delivery time can be greatly shortened, and it is possible to respond quickly to design changes.
In addition, in order to eliminate the change in spacing from the magnetic stripe surface to the magnetic recording layer that has been used in the past, a method of printing ink of the same hue as the colored layer (hiding layer) with a negative pattern of the printing portion on the non-printing portion Theoretically, it is possible to match the position and height of printing on the pattern part and filling printing on the non-pattern part. Occurrence of printing alignment fluctuations in the longitudinal direction and width direction is unavoidable, and it is impossible to eliminate output fluctuations. Further, in this method, the number of steps for forming a negative pattern is increased, and the number of steps from the pattern formation process to the card completion is large, so that it is not possible to respond quickly to delivery times or pattern changes.

Examples using fluorescent dyes as pattern forming agents are shown below.
(Example 7)
As a temporary support film for transfer, a polyethylene terephthalate film having a thickness of 24 μm is used, and on the one side of the film, the above-mentioned fluorescent agent diffusion prevention layer coating, colored layer coating, magnetic recording layer coating, and heat sensitive adhesive coating In this order, all were applied and dried using a reverse coater, and a fluorescent agent diffusion preventing layer, a colored layer, a magnetic recording layer, and a heat-sensitive adhesive layer were provided, respectively.
The thickness of each layer after drying was adjusted to 1 μm for the fluorescent agent diffusion preventing layer, 4 μm for the colored layer, 9 μm for the magnetic recording layer, and 1.5 μm for the heat sensitive adhesive layer.
As the fluorescent pattern printing, the fluorescent pattern printing ink [A] is applied onto the surface of the heat-sensitive adhesive layer of the transfer material prepared as described above by the gravure printing method so that the thickness of the pattern portion is 1 μm as shown in FIG. And left in a constant temperature room at 60 ° C. for 24 hours. At this stage, the temporary transfer support was peeled off and irradiated with ultraviolet rays from the surface side of the fluorescent agent diffusion preventing layer with an ultraviolet irradiation device, and a fluorescent pattern was visible. It can be seen that the fluorescent pattern fluorescent agent is sufficiently diffused to the transfer substrate side by the aging process.
After cutting the transfer laminate for forming magnetic stripes as described above into a predetermined width, a transfer material is applied to a card base oversheet (made by Taihei Chemical Co., Ltd.) made of polyvinyl chloride by a heat seal tester (made by Tester Sangyo Co., Ltd.) After the transfer, the temporary transfer support film for transfer is removed, and with the oversheet opposite to the center core for the card base, using a flat pressure press machine (a test vulcanizing press machine, manufactured by Toyo Seiki Seisakusho), A hot press process was performed under the conditions of a temperature of 130 to 140 ° C., a pressure of 20 kg / cm ² , and heating and pressurization for 20 to 30 minutes, and then punched into a card shape to produce a magnetic card FIG.

(Example 8)
A magnetic card was prepared in the same manner as in Example 7 except that the fluorescent pattern forming ink [A] was changed to the fluorescent pattern forming ink [B] in the fluorescent pattern printing of Example 7.
Example 9
In the fluorescent picture printing of Example 7, the magnetic card was formed in the same manner as in Example 7 except that the transfer laminate for forming the magnetic stripe after printing the fluorescent picture was not left in a constant temperature room at 60 ° C. for 24 hours. Created.
(Example 10)
In the fluorescent pattern printing of Example 8, the magnetic card was formed in the same manner as in Example 8 except that the transfer laminate for forming the magnetic stripe after fluorescent pattern printing was not left in a constant temperature room at 60 ° C. for 24 hours. Created.
(Example 11)
In Example 7, the transfer laminate for forming the magnetic stripe was prepared in the same manner as in Example 7, and fluorescent pattern printing was performed on the portion where the magnetic stripe of the card substrate “oversheet” was transferred. Using [A], fluorescent pattern printing was performed by a gravure printing method as shown in FIG. Thereafter, a magnetic card was produced in the same manner as the magnetic card production method of Example 7.
(Example 12)
A magnetic card was prepared in the same manner as in Example 7 except that the fluorescent pattern forming ink [A] was changed to the fluorescent pattern forming ink [B] in the fluorescent pattern printing of Example 9.

(Comparative Example 4)
A transparent oversheet on which a magnetic recording layer is formed in advance, a center core, a transparent oversheet, and a magnetic tape are laminated in this order, and simultaneously heat-sealed by one heating to obtain a pre-laminated card substrate.
As a temporary support film for transfer, a polyethylene terephthalate film having a thickness of 188 μm was used. On one side of this film, the above-mentioned fluorescent agent diffusion prevention layer coating, coloring layer coating, and heat-sensitive adhesive coating were all in this order. A reverse coater was used for coating and drying, and a fluorescent agent diffusion prevention layer, a colored layer, and a heat-sensitive adhesive layer were provided, respectively. The thickness of each layer after drying was formed so that the fluorescent agent diffusion preventing layer was 1 μm, the colored layer was 4 μm, and the heat-sensitive adhesive layer was 1 μm or less. After forming the heat-sensitive adhesive layer, a fluorescent pattern was formed so that the thickness after drying the fluorescent pattern forming ink [A] was 1 μm or less by a gravure printing method. In this way, a concealing layer transfer sheet with a fluorescent pattern is formed.
The card substrate with magnetic recording layer produced above is overlaid with the fluorescent pattern region side of the concealing layer transfer sheet with a fluorescent pattern, and the temperature is 120 to 130 using a flat pressure press (test vulcanizing press, manufactured by Toyo Seiki Seisakusho). ° C., a pressure 16~18kg / cm ^2, after bonding the concealed card hiding layer transfer sheet to the card substrate with the magnetic stripe heating and pressing time 15-25 minutes, then peeled off the PET film of the transfer sheet, a magnetic card It was created.

(Comparative Example 5)
In Comparative Example 4, a magnetic card was prepared in the same manner as in Comparative Example 4 except that the fluorescent pattern forming ink [A] was changed to the fluorescent pattern forming ink [B].
(Comparative Example 6)
In Comparative Example 4, a magnetic card was prepared in the same manner as in Comparative Example 4 except that the thickness of the colored layer was 7 μm.

Below, the evaluation method of the magnetic card in which the fluorescent pattern was formed is described.
(Pattern stability)
After storage for 1000 hours in a constant temperature layer at 60 ° C., the color development and shape change of the magnetic card were observed. With respect to the magnetic card with a pattern produced in Examples 7 to 12, there was no change in the pattern and both the color development and shape were maintained.
(Fluorescent pattern concealment I)
The presence or absence of fluorescent light emission of the fluorescent pattern due to ultraviolet light contained in sunlight and indoor light was evaluated visually under sunlight and indoor light.
○ Fluorescence emission is not visible at all.
Δ: Fluorescent light emission can be visually recognized, but the picture cannot be recognized.
X: Fluorescence emission is visible to the pattern.

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

(Fluorescence emission by UV irradiation)
Visually evaluate the fluorescence emission intensity of the fluorescent pattern by UV irradiation.
A sufficient fluorescence can be obtained.
Δ: Insufficient fluorescent light and poor visibility of fluorescent pattern.
× ·· The fluorescence emission is very weak and the shape of the pattern cannot be confirmed accurately.

(Output fluctuation)
Based on ISO / IEC7811-6, the recording / reproduction characteristics of the obtained magnetic card were measured using MAGTESTER 2000 manufactured by BARNES, and the output fluctuation was determined by the following equation. As for the magnetic stripe on the magnetic card used to create the magnetic card sample, the film thickness of the magnetic recording layer is adjusted in accordance with each spacing, and the output average value becomes equal to the reference card output. Adjustments were made.
Output fluctuation (%) = ((maximum output value−minimum output value) / average output value) × 100
○: Less than 5%. Δ: 5% or more and less than 10%. X: 10% or more.

As is clear from the results in Table 2, Examples 7 to 12 can ensure the same fluorescence emission intensity as Comparative Examples 4 and 5 which are one aspect of a magnetic card having a conventional fluorescent pattern, The fluorescent pattern is not visually recognized by the fluorescence emission by the ultraviolet rays contained in the room light. Further, in Examples 7 to 12, since the fluorescent agent used in the fluorescent pattern printing is diffused in the magnetic recording layer and the colored layer, the fluorescent pattern printing is performed by reflecting the visible light of sunlight or room light on the colored layer. The outline of the printed part is not deformed so as to be visible. In addition, since the distance between the magnetic stripe surface and the magnetic recording layer does not substantially change between the fluorescent pattern part and the non-fluorescent pattern part, output fluctuation due to the presence of the fluorescent pattern does not occur at all. By using the fact that no fluctuation occurs as a criterion for determining the authenticity of a card, it is possible to prevent forgery more reliably. On the other hand, in the comparative examples 4 and 5, the concealment by the colored layer is insufficient, the fluorescent light emission of the pattern can be visually recognized by sunlight or ultraviolet rays in the room light, and the step of the pattern can be visually recognized by the visible reflected light. The presence of fluorescent patterns cannot be concealed. Even if the thickness of the colored layer is increased, this situation is not improved as shown in Comparative Example 6, but rather the fluorescence emission intensity is lowered.
The number of processes from the pattern formation process to the card completion is smaller than before, and the point that it is possible to respond quickly to delivery times and pattern changes is the same as in Examples 1 to 6 where the pattern is formed using a colorant. is there.

  The present invention provides a magnetic recording medium having a pattern that can be identified from the magnetic reading side on a magnetic stripe portion, a method for producing the magnetic recording medium, and a transfer laminate used in the method for producing the magnetic recording medium. For example, it can be effectively used for a card-like magnetic recording medium such as a credit card or a bank card, in which a layer including a magnetic recording medium layer is laminated on a card base layer.

It is an expanded sectional view of the conventional magnetic card produced with the laminated body for transfer for magnetic stripe formation. It is sectional drawing which shows one aspect of the laminated body for transcription | transfer used for the manufacturing method of the magnetic recording medium of this invention. It is sectional drawing which showed notionally that a pattern formation agent spread | diffused when performing the aging of the said laminated body for transfer. FIG. 5 is a cross-sectional view conceptually showing a case where a colored layer portion is formed on the oversheet base material side in one embodiment of the method for producing a magnetic recording medium of the present invention. It is sectional drawing which shows one aspect | mode of the magnetic card produced by the manufacturing method of the magnetic recording medium of this invention. It is the conceptual diagram which showed the laminated body for transfer for magnetic stripe formation manufactured in Examples 1-4, and the pattern formed in this laminated body for transfer. It is the schematic which showed the area | region which forms the pattern in Example 5 and Example 6. FIG. It is the schematic which shows one aspect | mode of the magnetic card in which the pattern was formed using the manufacturing method of the magnetic recording medium of this invention. It is a figure showing an example of the process of manufacturing a magnetic card using the manufacturing method of the magnetic recording medium of the present invention. It is a figure showing the other example of the process of manufacturing a magnetic card using the manufacturing method of the magnetic recording medium of this invention. It is a figure showing the conventional manufacturing method of the magnetic card | curd which has a magnetic recording layer and a pattern.

Explanation of symbols

1: picture forming agent diffusion preventing layer, 2: picture forming agent diffusion region, 3: colored layer, 4: magnetic recording layer, 5: heat-sensitive adhesive layer, 6: oversheet, 7: center core, 8: on card Pattern part, 9: Temporary support for transfer, 10: Pattern formation part

Claims (16)

In a laminate formed by a plurality of layers including a base layer and a magnetic recording layer, the laminate has a pattern formed by a pattern forming agent, and the pattern is from the surface of the laminate opposite to the base layer. The pattern forming agent is distributed in the film thickness direction of the laminate, and the magnetic recording layer from the central portion of the magnetic recording layer in the reading side region from the central portion of the magnetic recording layer in the laminate. A magnetic recording medium having a distribution having a region having a concentration gradient that gradually decreases toward a reading side. The magnetic recording medium according to claim 1, wherein the pattern forming agent contains a colorant. The magnetic recording medium according to claim 1, wherein the pattern forming agent contains a fluorescent agent. The magnetic recording medium according to claim 1, wherein the density distribution of the pattern forming agent gradually decreases from the interface on the base layer side of the magnetic recording layer toward the magnetic reading side. The magnetic recording medium according to claim 1, further comprising a colored layer on a magnetic recording reading side of the magnetic recording layer. The magnetic recording medium according to claim 1, further comprising a pattern forming agent diffusion preventing layer on the outermost layer on the magnetic recording reading side of the magnetic recording layer. A transfer material having at least one magnetic recording layer on a temporary transfer support, and having a pattern formed on the surface of the magnetic recording layer opposite to the surface in contact with the transfer temporary support by a pattern forming agent. Forming,
Next, a transfer body is formed by transferring the transfer material from the temporary transfer support onto the base material layer,
Thereafter, the laminated body has a region having a concentration gradient gradually decreasing from the central portion of the magnetic recording layer toward the magnetic recording reading side in a region on the reading side from the central portion of the magnetic recording layer in the laminated body. By diffusing the pattern former as
In a laminate formed by a plurality of layers including a base layer and a magnetic recording layer, the laminate has a pattern formed by a pattern forming agent, and the pattern is from the surface of the laminate opposite to the base layer. The pattern forming agent is distributed in the film thickness direction of the laminate, and the magnetic recording layer from the central portion of the magnetic recording layer in the reading side region from the central portion of the magnetic recording layer in the laminate. A method of manufacturing a magnetic recording medium, characterized in that the magnetic recording medium is distributed with a region having a concentration gradient that gradually decreases toward a reading side. A transfer material having at least one magnetic recording layer on a temporary transfer support, and having a pattern formed on the surface of the magnetic recording layer opposite to the surface in contact with the transfer temporary support by a pattern forming agent. Forming,
Thereafter, in the region of the transfer material from the center of the magnetic recording layer to the transfer temporary support side interface of the magnetic recording layer in the transfer material, the direction from the center of the magnetic recording layer to the transfer temporary support side interface of the magnetic recording layer After diffusing the picture former to have a region with a concentration gradient that gradually decreases towards
By forming a laminate by transferring the transfer material from a temporary support for transfer onto a base material layer,
In a laminate formed by a plurality of layers including a base layer and a magnetic recording layer, the laminate has a pattern formed by a pattern forming agent, and the pattern is from the surface of the laminate opposite to the base layer. The pattern forming agent is distributed in the film thickness direction of the laminate, and the magnetic recording layer from the central portion of the magnetic recording layer in the reading side region from the central portion of the magnetic recording layer in the laminate. A method of manufacturing a magnetic recording medium, characterized in that the magnetic recording medium is distributed with a region having a concentration gradient that gradually decreases toward a reading side. Forming a transfer material having at least one magnetic recording layer on the temporary transfer support,
Next, a laminate is formed by transferring the transfer material onto the pattern of the base material layer on which the pattern is formed by the pattern forming agent,
Thereafter, the laminated body has a region having a concentration gradient gradually decreasing from the central portion of the magnetic recording layer toward the magnetic recording reading side in a region on the reading side from the central portion of the magnetic recording layer in the laminated body. By diffusing the pattern former as
In a laminate formed by a plurality of layers including a base layer and a magnetic recording layer, the laminate has a pattern formed by a pattern forming agent, and the pattern is from the surface of the laminate opposite to the base layer. The pattern forming agent is distributed in the film thickness direction of the laminate, and the magnetic recording layer from the central portion of the magnetic recording layer in the reading side region from the central portion of the magnetic recording layer in the laminate. A method of manufacturing a magnetic recording medium, characterized in that the magnetic recording medium is distributed with a region having a concentration gradient that gradually decreases toward a reading side. The method for manufacturing a magnetic recording medium according to claim 7, wherein the transfer material has a plurality of magnetic recording layers. The method of manufacturing a magnetic recording medium according to claim 10, wherein the pattern is formed between the plurality of magnetic recording layers. 10. The transfer material according to claim 7, further comprising one or more layers other than the magnetic recording layer at a position opposite to the temporary transfer support with the magnetic recording layer interposed therebetween. Manufacturing method of magnetic recording medium. 13. The method of manufacturing a magnetic recording medium according to claim 12, wherein the pattern is formed between the magnetic recording layer and a layer other than the magnetic recording layer, or between two or more layers other than the magnetic recording layer. A transfer laminate for use in the method for producing a magnetic recording medium according to claim 7, wherein the transfer laminate is formed of a magnetic recording layer on a temporary transfer support and a pattern forming agent on the magnetic recording layer. A transfer laminate , wherein a transfer material having a pattern is formed. The transfer laminate according to claim 14, further comprising a colored layer on the temporary recording support side of the magnetic recording layer. The laminate for transfer according to claim 15, further comprising a pattern forming agent diffusion preventing layer adjacent to the temporary support for transfer.

Images