Magnetic recording medium and magnetic recording medium manufacturing method

The present invention relates to a magnetic recording medium which is laminated and formed by a plurality of layers including a base material layer and a magnetic recording layer and has a pattern identifiable from the magnetic reading side of the magnetic recording layer, a method for producing the magnetic recording medium, and the magnetism. The present invention relates to a transfer laminate used in a method for producing a recording medium. In particular, it is a card-shaped 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 base material layer for a card, and has a pattern that can be identified from the magnetic reading side on a magnetic stripe portion. The present invention relates to a formed magnetic recording medium, a method for producing the magnetic recording medium, and a transfer laminate used in the method for producing the magnetic recording medium.

In recent years, various patterns have been formed on various magnetic recording media for practical or design purposes. In particular, for magnetic cards such as credit cards and bank cards that require high design, it is important to impart high design, and a colored layer is conventionally provided on the magnetic stripe formed on the card base material. , Color-colored magnetic stripes that completely conceal black and brown derived from the magnetic powder originally possessed by the magnetic recording layer are known, 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 on which a pattern is formed is also produced. To form this magnetic stripe with a pattern, as shown in step b of FIG. 11, a release layer and a protective layer or a protective layer having a release function are formed on the temporary support for transfer, and the pattern is placed on the release layer and the protective layer. After the formation, a colored layer that hides the hue of the magnetic recording layer, a magnetic recording layer, and a heat-sensitive adhesive layer are formed in this order to prepare a laminated body, and the laminated body is cut to a desired width to form a magnetic stripe. To obtain a transfer laminate for use. The transfer material of the transfer laminate for forming the magnetic stripe thus obtained is transferred to the oversheet of the card base material, hot-pressed together with the center core and the oversheet on the opposite surface, and the oversheet is magnetic-stripe. Obtain a magnetic stripe card with a pattern in which a transfer material for use is embedded (see Fig. 1).

However, in the magnetic stripe with a pattern formed in this way, since the region where the pattern is formed is located on the magnetic recording reading side of the magnetic recording layer, the magnetic head and the magnetism at the time of recording / reproduction are formed in the pattern portion and the non-pattern portion. Since the spacing, which is the distance between the recording layer and the recording layer, changes, the playback output fluctuates, and as a result, the possibility of error occurrence when reading information tends to increase. As a method of eliminating such a step between the pattern portion and the non-pattern portion due to the pattern formation, a method of filling the space of the non-pattern portion by using a negative pattern of the pattern portion so as to fill the space of the non-pattern portion is disclosed. (See Patent Document 1). Then, by making the colored layer (concealing layer) formed on the entire upper part of the pattern portion and the space filling ink applied to the recesses of the non-pattern portion the same hue, the printing of the negative pattern on the non-pattern portion was conspicuous. It is also possible to improve the effect of the filling ink by eliminating it. However, although this method has a certain effect of suppressing the output fluctuation caused by the step, it is not perfect, and a new coating process for filling the non-patterned portion is required, which inevitably reduces the production efficiency. It was.

To solve these problems, a method for producing a magnetic tape has been proposed in which a concealing layer and a resin coating film layer that can be dyed with a disperse dye are formed on a magnetic recording layer, and the resin coating film layer is dyed with a sublimation disperse dye. (See Patent Document 2). However, although this method can prevent the occurrence of unevenness due to the formation of the pattern, it is necessary to form a resin coating film layer for fixing the dye in addition to the concealing layer. In addition, it is usually difficult for sublimable dyes to achieve both good sublimation and stability, and the weather resistance and aging stability of the formed pattern are not always sufficient. Further, in this method, a pattern is formed on the outermost resin coating film layer with a sublimation dye, and then a protective layer is further formed on the pattern, so that the layers cannot be laminated at once in the transfer step. The process is divided and the manufacturing efficiency is reduced. On the other hand, as a special pattern, in magnetic cards such as credit cards and bank cards where security is important, a pattern is provided on the magnetic recording layer using infrared ink or a fluorescent agent as a means of preventing counterfeiting. Are known. It is important that these patterns cannot usually be visually identified, and that the position and existence of the patterns themselves are concealed and can only be identified by using a specific light source or detector. However, if a step is generated by the pattern, the security property is lowered as shown below. For example, as a fluorescent pattern using a fluorescent agent, it is necessary that it cannot be visually recognized by ultraviolet rays contained in sunlight or room light as described above, but can be visually recognized as a fluorescent pattern only by irradiation with ultraviolet rays by a dedicated ultraviolet irradiation device. , This makes it possible to judge the authenticity of the card. Therefore, a concealing layer is formed on the region where the fluorescent pattern is formed, and the fluorescent pattern is recognized only when a strong ultraviolet ray is irradiated with 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 the reproduction output. Therefore, it was difficult to completely eliminate the step difference in the fluorescent pattern. Therefore, even if the fluorescent pattern cannot be visually recognized by the concealing layer due to sunlight, room light, etc., the presence of the pattern is visually recognized by the reflected light because a step formed by the fluorescent pattern and not completely eliminated remains. There was an inconvenience. Further, the remaining step has a problem that the reproduction output fluctuates and the signal quality is deteriorated. In order to solve such a problem, as a method for 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 support for transfer. 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 is formed in advance through a transfer step. (See Patent Document 4). According to this method, the ink in the fluorescent pattern forming region formed on the concealing layer appropriately permeates into the concealing layer, so that the fluorescent agent permeating the concealing layer after transfer receives ultraviolet rays and emits light. Therefore, the fluorescence is not blocked by the concealing layer, and there is no step due to the pattern formed by the fluorescent agent. However, it is necessary to make a delicate balance in selecting the ink composition and the resin composition of the concealing layer so that the fluorescent agent can be appropriately permeated into the concealing layer. There is a high possibility that insufficient emission intensity will occur. In addition, the selection of ink and resin is restricted, and the degree of freedom in design is restricted.

Further, in the case of the conventional method for manufacturing a magnetic recording medium with a pattern in which a pattern is formed on the magnetic stripe portion through a transfer step, there are the following inconveniences. That is, the printing of the pattern formed on the transfer laminate is usually performed after the formation of a release layer, a protective layer or a protective layer having a release function on the transfer substrate, followed by a colored layer, a magnetic recording layer and a heat sensitive layer. Each layer of the adhesive layer is sequentially laminated and formed. That is, the printing of the pattern must be performed at the initial stage in the manufacturing process of the transfer laminate for forming the magnetic stripe, and after determining and producing the pattern, more steps and time are required for forming the magnetic stripe. 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, the pattern cannot be corrected in a short time, and the pattern correction is significantly delayed in delivery. Causes inefficiency. When a pattern is formed on the magnetic recording layer of the magnetic recording medium as described above, the signal characteristics are often deteriorated or the original function of the pattern cannot be sufficiently fulfilled due to the higher design. In addition, it cannot be said that the production efficiency is good by the conventional method for manufacturing a magnetic recording medium with a pattern.

<patcit num="1"><text>JP-A-59-168933</text></patcit><patcit num="2"><text>Japanese Unexamined Patent Publication No. 2000-155937</text></patcit><patcit num="3"><text>Japanese Unexamined Patent Publication No. 2000-002160</text></patcit><patcit num="4"><text>Japanese Unexamined Patent Publication No. 9-309287</text></patcit>

<p> An object of the present invention is to have a pattern that can be identified from the surface of the magnetic recording medium on the magnetic recording reading side and that has good stability over time, and that a step is not formed in the pattern forming portion due to the formation of the pattern. It is an object of the present invention to provide a magnetic recording medium that does not cause fluctuations in playback output due to a step and does not impair the function that the pattern should originally perform. Further, an object of the present invention is a method for manufacturing a magnetic recording medium for producing a magnetic recording medium having a pattern that can be identified from the surface on the magnetic recording reading side through a transfer step, because a step does not occur in the pattern forming portion. Since the reproduction output does not fluctuate, the manufacturing efficiency is good, and the process from the formation of the pattern to the production of the magnetic recording medium is short, by providing a method for manufacturing the magnetic recording medium that can quickly respond to the pattern change. is there. Further, an 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 the formation of the pattern causes a step in the pattern forming portion. It is an object of the present invention to provide a transfer laminate capable of efficiently producing a non-magnetic recording medium.</p>

<p> The present invention has a pattern formed by a pattern forming agent in a laminate formed by a plurality of layers including a base material layer and a magnetic recording layer, and the pattern is in the direction opposite to the base material layer of the laminate. The pattern-forming agent is distributed in the film thickness direction of the laminated body, and 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 laminated body. Provided is a magnetic recording medium characterized in that it is distributed with a region having a density gradient that gradually decreases from the magnetic recording to the reading side. Further, the present invention has at least one magnetic recording layer on the temporary support for transfer, and a pattern is formed on the surface of the magnetic recording layer opposite to the surface in contact with the temporary support for transfer with a pattern forming agent. Form the formed transfer material,</p><p> Next, the transfer material is transferred from the temporary support for transfer onto the base material layer to form a laminated body, and then the laminated body is formed in the region on the reading side from the central portion of the magnetic recording layer in the laminated body. A plurality of layers including a base material layer and a magnetic recording layer by diffusing the pattern forming agent so as to have a region having a concentration gradient gradually decreasing from the central portion of the magnetic recording layer toward the magnetic recording reading side. The laminate formed by the layers has a pattern formed by a pattern-forming agent, and the pattern can be identified from the surface of the laminate in the direction opposite to the base material layer, and the pattern-forming agent is used. A concentration that is distributed in the film thickness direction of the laminate and gradually decreases from the center of the magnetic recording layer toward the reading side of the magnetic recording in the region from the center of the magnetic recording layer to the reading side in the laminate. Provided is a method for producing a magnetic recording medium, which is characterized by having a region having a gradient and being distributed.</p><p> Furthermore, the present invention has at least one magnetic recording layer on the temporary support for transfer, and a pattern is formed on the surface of the magnetic recording layer opposite to the surface in contact with the temporary support for transfer with a pattern forming agent. The formed transfer material is formed, and then, in the region of the transfer material from the center of the magnetic recording layer to the temporary support side interface for transfer of the magnetic recording layer, the magnetic recording layer is formed from the center of the magnetic recording layer. After the pattern-forming agent is diffused so as to have a region having a concentration gradient that gradually decreases toward the transfer temporary support side interface, the transfer material is transferred from the transfer temporary support onto the base material layer. A pattern formed by a pattern forming agent is contained in a layer formed by a plurality of layers including a base material layer and a magnetic recording layer, and the pattern is the laminated body. The pattern-forming agent is identifiable from the surface in the direction opposite to that of the base material layer, is distributed in the film thickness direction of the laminated body, and is distributed in the region on the reading side from the central portion of the magnetic recording layer in the laminated body. Provided is a method for producing a magnetic recording medium, characterized in that the magnetic recording medium is distributed with a region having a density gradient gradually decreasing from the central portion of the magnetic recording layer toward the magnetic recording reading side.</p><p> Furthermore, in the present invention, the transfer material having at least one magnetic recording layer is formed on the temporary support for transfer, and then the transfer material is formed on the pattern of the base material layer on which the pattern is formed by the pattern forming agent. Is transferred to form a laminated body, and then the laminated body is directed from the central portion of the magnetic recording layer to the reading side of the magnetic recording layer in a region on the reading side from the central portion of the magnetic recording layer in the laminated body. The pattern-forming agent is formed in a laminate formed by a plurality of layers including a base material layer and a magnetic recording layer by diffusing the pattern-forming agent so as to have a region having a concentration gradient that gradually decreases. The pattern can be identified from the surface of the laminated body in the direction opposite to the base material layer, and the pattern forming agent is distributed in the film thickness direction of the laminated body in the laminated body. The region from the center of the magnetic recording layer to the reading side is characterized by having a region having a density gradient that gradually decreases from the center of the magnetic recording layer toward the reading side of the magnetic recording. Provide a method for manufacturing a magnetic recording medium. Further, the present invention provides a transfer laminate characterized in that a magnetic recording layer and a transfer material having a pattern formed by a pattern forming agent are formed on the temporary support for transfer. provide.</p>

<p> 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 laminated body, and in the region from the center of the magnetic recording layer to the magnetic recording reading side in the laminated body. It is distributed with a region having a density gradient that gradually decreases from the central portion of the magnetic recording layer toward the magnetic recording reading side. Unlike a normal magnetic recording medium having a pattern, the pattern forming agent does not exist or localize in a specific region on the magnetic recording layer in a high concentration, so that a step may occur in the pattern forming portion. There is no fluctuation in the playback output due to the step. According to the method for producing a magnetic recording medium of the present invention, the pattern forming agent for a pattern formed on the magnetic recording layer of the transfer material having the magnetic recording layer, or on either or both of the base material is based on the transfer material. Before or after the step of transferring onto the material to form the laminate, the central portion of the magnetic recording layer is diffused in the transfer material and in the region on the reading side from the central portion of the magnetic recording layer in the laminate. It is distributed with a region having a density gradient that gradually decreases toward the magnetic recording reading side, and can be identified from the surface of the laminated body. Therefore, a step corresponding to the pattern forming portion does not occur, and the reproduction output does not fluctuate due to the step.</p><p> 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 between the magnetic recording layer and the base material after transfer to the base material. Will be located in. Then, due to 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 laminated body, and in the region on the reading side from the center of the magnetic recording layer in the laminated body, the said It is distributed with a region having a density gradient that gradually decreases from the center of the magnetic recording layer toward the magnetic recording reading side. Therefore, a step corresponding to the pattern forming portion does not occur, and the reproduction output does not fluctuate due to the step. Further, 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 the base material, so that the region can be used for transfer. It can be formed at the final stage of the manufacturing process of the laminate or separately from the laminate for transfer. For this reason, a part other than the pattern of the transfer laminate can be prepared in advance, and the pattern can be formed at the final stage after the pattern is confirmed, and the process from the pattern formation to the card production can be shortened, so that the pattern can be changed. Can be dealt with promptly. Furthermore, as the pattern or fluorescent pattern formed in the method for producing a magnetic recording medium of the present invention, the colorant or fluorescent agent conventionally used for forming the pattern on the magnetic recording medium is basically used as it is. can do. Therefore, at least the same pattern stability, light resistance, and weather resistance as in the conventional manufacturing method can be obtained. Further, 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 may be directly exposed to external light rays or mechanical contact. It is considered to have good pattern stability, durability, weather resistance, and light resistance.</p>

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 material layer and a magnetic recording layer, and the pattern is the group of the laminate. It can be identified from the surface in the direction opposite to the material layer. The base material layer of the present invention has a sheet shape or a plate shape, and as materials, for example, plastics such as vinyl chloride, nylon, cellulose diacetate and polyethylene terephthalate, papers such as synthetic paper and cloth paper, and papers such as cloth paper, and Examples thereof include composites of these materials, but other than these, any material having the strength and rigidity required to form a laminate can be used without particular limitation. As the pattern forming agent used in the present invention, various materials usually used as a material for forming various patterns formed on a magnetic recording medium for imparting functionality, design, etc. can be used. .. They may form visually identifiable patterns such as colorants and materials for night paints, or they can be identified by the use of light sources and detectors such as fluorescent agents and materials for infrared inks. It may form a pattern. Alternatively, a pattern that can be identified by using an element, a compound, or the like that can be detected only by using a specific detection device may be formed. 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 a region on the reading side from the center of the magnetic recording layer. It is distributed with a region having a density gradient that gradually decreases from the central part of the magnetic recording to the reading side. Therefore, for example, the fluorescent agent does not localize on the surface layer portion of the magnetic card, and a step does not occur at the place where the pattern is provided as described above. Therefore, even if a concealing layer that covers the surface layer portion is not provided, the existence of the fluorescent pattern itself and its corresponding portion or content cannot be identified by sunlight or room light without irradiation with ultraviolet rays. Therefore, it is possible to prevent the anti-counterfeit information and the identification information from being easily known from the printed portion and the printed content.

In the present invention, the pattern forming agent is distributed in the film thickness direction of the laminated body, 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 laminated body. It is distributed with a region having a density gradient that gradually decreases from the magnetic recording to the reading side. In the present invention, the "magnetic recording / reading side" is the side where the magnetic head for recording / reproduction comes into contact with the assumed magnetic recording medium. In such a distribution, the pattern forming agent is distributed at a high concentration on the magnetic recording layer near the surface layer of the laminated body, or is stationed near the surface layer of the laminated body, like the pattern conventionally formed in the magnetic recording medium. It cannot be achieved by the method of forming a pattern by making it exist. The distribution of such a pattern-forming agent 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 patterns are laminated and formed. It can also be formed by eroding adjacent layers with the solvent of the pattern-forming paint. However, the method using thermal diffusion is preferable in terms of ease of control and the degree of freedom in selecting the pattern forming agent and the resin for forming the laminate. Although the rate of diffusion differs depending on the layers that make up the laminate, the thermal diffusion is basically isotropic, and the pattern gradually increases from the region where the pattern was first formed to the direction of lower concentration 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 forming the pattern. To distribute the pattern-forming agent with a region having a density 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 is performed by sandwiching the magnetic recording layer. A pattern may be formed between layers or magnetic recording layers located on the side opposite to the side direction. The pattern forming agent is isotropically diffused, and the pattern forming agent diffused on the magnetic recording reading side forms an identifiable pattern. The pattern forming agent diffuses in the direction perpendicular to the film thickness direction, but since the film thickness is thin, the pattern is not diffused to the extent that the pattern becomes unclear at the time of identifying the pattern.

For example, in the production method of the present invention, a plurality of layers including a magnetic recording layer are formed on the temporary support for transfer, and the magnetic recording layer of the temporary support for transfer is sandwiched between the temporary support for transfer and the opposite side of the temporary support for transfer. A pattern is formed by a pattern forming agent on a magnetic recording layer located between layers located in the above or on a surface opposite to the surface in contact with the temporary support for transfer, and the transfer material is transferred from the temporary support for transfer onto a substrate. After that, the laminate is gradually formed in the region from the center of the magnetic recording layer to the reading side in the laminate in the direction from the center of the magnetic recording layer to the reading side of the magnetic recording. 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 toward the surface side of the transfer material after transfer, so that the pattern-forming agent is diffused. Is distributed in the film thickness direction of the transfer material, and the pattern is in a state where it can be identified from the direction on the magnetic recording reading side. Since the pattern forming agent does not localize on the surface of the card and the forming of the pattern does not cause fluctuations in the spacing, which is the distance between the magnetic head and the magnetic recording layer, fluctuations in the magnetic reproduction output may occur. Absent.

In the production method of the present invention, the transfer material may have a plurality of magnetic recording layers, or a pattern may be formed between the layers of the plurality of magnetic recording layers. Further, in the production 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 support for transfer with the magnetic recording layer interposed therebetween. A pattern may be formed between the layer and a layer other than the time recording layer, or two or more layers other than the magnetic recording layer. As a component other than the magnetic recording layer and the pattern forming layer of the laminated body formed on the base material, a colored layer that hides the hue of the magnetic recording layer can be formed on the magnetic reading side of the magnetic recording layer. Further, in order to improve the adhesive force with the base material when forming the laminate through the transfer step, the heat-sensitive adhesive layer can be formed at a position in contact with the base material. Further, 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 prevention layer can be used as the outermost layer on the magnetic reading side of the magnetic recording layer. .. In particular, the magnetic recording layer and the colored layer are provided on the base material in this order, and the pattern forming agent has a region having a concentration gradient that gradually decreases toward the recording reading side and is distributed in the magnetic recording layer and the colored layer. Since the pattern of the magnetic recording medium is identified together with the background color of the colored layer, the magnetic recording medium has extremely high distinctiveness and design.

Further, in the magnetic recording medium of the present invention, the pattern forming agent is diffused from the center of the magnetic recording layer toward the magnetic recording reading side before or after the transfer of the transfer material to form an identifiable pattern. A diffusion region is needed in which the agent diffuses and is identifiablely retained. Since the region basically corresponds to the portion of the laminated body in which the pattern forming agent can be diffused among the layers laminated toward the magnetic recording reading side of the pattern, the area of the pattern in the thickness direction of the magnetic recording medium corresponds to the region. It depends on the formation site. The diffusion region may be a colored layer, a colored layer, a magnetic recording layer, and a heat-sensitive adhesive layer, or may be a magnetic recording layer alone, although the distinctiveness of the pattern tends to decrease. Is. If the film thickness of the region is too thin, the pattern forming agent that can be retained is insufficient, so that the pattern forming is not sufficiently performed, and the pattern forming agent whose diffusion in the thickness direction is suppressed diffuses laterally to form a pattern. It tends to be blurred. On the other hand, if the film thickness of the region is too thick, the diffusion region may become too wide and the pattern may become unclear while diffusing in the magnetic recording reading direction from the surface to a position where it can be identified. For this reason, the total film thickness of the laminated body located 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 prevention layer described later, and is preferably 3 to 20 μm. The degree is more preferable.

In the present invention, the pattern can be formed at any position as long as it is between the magnetic recording layer and the base material when the laminate is formed on the base material. Therefore, when forming a laminate through the transfer step, the pattern should be laminated at an arbitrary position on the opposite side of the temporary support for transfer with the magnetic recording layer sandwiched in the transfer material on the temporary support for transfer. Can be done. However, the step of forming the pattern-forming layer, where design changes are frequently made, is preferably as close as possible to the process of producing the 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 magnetic stripe formation after the heat-sensitive adhesive layer is formed, which corresponds to the uppermost layer of the transfer material on the temporary support for transfer, or is magnetic. It is preferable that the pattern forming layer is formed on the base material side to which the stripes are transferred. In this way, for example, by creating a transfer laminate for a plain magnetic stripe without printing a pattern in advance, as soon as the design of the magnetic card including the magnetic stripe pattern is decided, the uppermost layer of the transfer laminate or Since it is possible to print a pattern on a base material for a card and then manufacture the card through a transfer process and a thermal pressure pressing process, it is possible to manufacture a magnetic card having a magnetic stripe with a pattern in a short delivery time from 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 is transferred to a base material 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 process of manufacturing the magnetic card, there is a step of laminating and integrating a plurality of card substrates, magnetic stripes, etc. by a hot pressure press at the final stage of the process. The pattern forming agent can be diffused in the pressing process. The conditions for diffusing the pattern forming agent include the ease of diffusion of the pattern forming agent, the temperature, heating time, amount of the pattern forming agent to be used, etc. in consideration of the type and Tg of the resin used in the laminate. Can be adjusted as appropriate.

Hereinafter, a method for manufacturing a magnetic card having a magnetic stripe on which a pattern is formed will be described in detail as an example of the method for manufacturing the magnetic recording medium of the present invention. As one of the embodiments of the magnetic recording medium manufacturing method of the present invention, a method of first forming a pattern on the transfer material side 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 the transfer laminate used in the production method of the present invention. A position adjacent to the magnetic recording layer is also possible as a position in the transfer material capable of forming a pattern, but in FIG. 9, it is most advantageous in terms of production efficiency in terms of a small number of work constants from pattern formation to card production. The case where the pattern is provided on the heat-sensitive adhesive layer is shown. In this method, as shown in FIG. 2, after providing the pattern forming agent diffusion prevention layer 1 on the temporary support for transfer 9, a colored layer 3 is further formed, a magnetic recording layer 4 is further formed on the colored layer 3, and the magnetic recording layer 4 is further formed on the colored layer 3. 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 the pattern, and the transfer laminate having the pattern forming function is produced. The pattern-forming agent is diffused in the transfer temporary support direction of the transfer laminate corresponding to the magnetic recording reading direction after transfer by heating the transfer laminate (Fig. 9- (1)). Therefore, when it is peeled off from the temporary support for transfer and transferred onto the oversheet which is the base material, it becomes identifiable from the surface of the transfer material opposite to the base material, that is, the surface on the magnetic recording reading side. (See Figure 3). Alternatively, the pattern forming agent is a heat pressing process in which the transfer material for the magnetic stripe is transferred to the oversheet 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). -By (2)), the transfer material for magnetic stripe is embedded in the oversheet, and at the same time, the pattern forming agent diffuses in the surface direction (magnetic recording reading side direction) of the transfer material after transfer, and the formed pattern is formed. It can be identified from the surface of the magnetic stripe. In this way, the pattern forming agent may be diffused only by the heat pressing step which is indispensable in the magnetic card manufacturing step, but at this time, the aging step (Fig. 9- (1)) in the state of the transfer laminate is also combined in advance. This is preferable because the pattern-forming agent can be diffused more reliably.

Further, as another embodiment of the pattern forming method of the present invention, FIGS. 4 and 10 show a method of forming the pattern on the substrate side, that is, on the 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 part where the transfer laminate for the magnetic stripe without a pattern is created, but as soon as the pattern of the magnetic stripe is decided, the pattern is oversheet magnetic. The stripe is formed on the portion to be transferred, and the transfer material for magnetic stripe is transferred onto the portion. After that, the oversheet is united with the center core, and a heat pressing process is performed to integrate the card substrate together with the oversheet on the opposite side of the center core, and the transfer material for forming the magnetic stripe is embedded in the card substrate. The pattern forming agent of the pattern formed at this time is transferred to the oversheet through the magnetic recording layer in the surface direction of the transfer material (diffusing toward the magnetic recording reading side, so that the pattern can be identified from the magnetic stripe surface. .. As shown in the cross-sectional view (FIG. 5) of the magnetic stripe portion, the magnetic card manufactured in this manner has a pattern-forming agent diffusion prevention layer that also serves as a protective layer from the oversheet 6 laminated on the center core 7. 1 is exposed on the card surface and a laminate that is a transfer material for forming a magnetic stripe is embedded, and 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 a magnetic stripe. It has a pattern-forming agent diffusion region 2 in which the pattern-forming agent is diffused. There, the pattern-forming agent of the pattern 10 formed on the oversheet 6 in contact with the thermal adhesive layer 5 diffuses toward the magnetic recording reading side of the embedded laminate, and the concentration gradient gradually decreases. It has a region with and is distributed in the surface direction. Therefore, the pattern can be identified from the pattern forming agent diffusion prevention layer 1 side. The above method of directly forming the pattern on the oversheet side, which is the card base material, can set the printing position accuracy of the pattern on the magnetic card higher than the other method of forming the pattern on the transfer laminate side. Therefore, it can be suitably used when mass-producing a complicated pattern that requires accurate alignment between the pattern and the base material for a card.

A magnetic card having a pattern on the magnetic stripe portion can be formed by the above procedure, but the pattern forming method used in the method for manufacturing the magnetic recording medium of the present invention is located on a place other than the magnetic stripe on the magnetic card. Also, it can be applied to a magnetic recording medium other than a magnetic card, and further to a laminate having no magnetic recording layer. In such a case, the method of forming the pattern can be dealt with by omitting the magnetic recording layer, adding another layer, or replacing the magnetic recording layer with another functional layer in the process diagrams of FIGS. 9 and 10. Can be done. Further, when the magnetic card is formed by using the transfer laminate for forming the magnetic stripe as described above, only a part of the base material of the magnetic card is covered with the magnetic stripe, but the base for the card. A pattern covering the entire surface of the card may be formed by using a transfer laminate that covers the entire surface of the material and a transfer step.

Hereinafter, each configuration of the transfer laminate used in the method for producing a magnetic recording medium of the present invention will be described in more detail step by step in the production process. The transfer laminate for forming a magnetic stripe, which is one of the aspects of the transfer laminate of the present invention, is formed on the transfer base material 9 as needed, as shown in the cross-sectional configuration diagram of FIG. It is manufactured by sequentially laminating a pattern-forming agent diffusion prevention layer 1, a coloring layer 3 formed as needed, a magnetic recording layer 4 as an essential component, and a heat-sensitive adhesive layer 5 formed as needed. Can be done. When the heat-sensitive adhesive layer is provided on the magnetic recording layer, it is preferable to form a pattern printed with the pattern 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 film that can be used as a temporary support for transfer. For example, polyesters such as polyethylene terephthalate, polyolefins such as polypropylene, cellulose derivatives such as cellulose triacetate, and other plastics such as polyamide can be mentioned. Of these, polyethylene terephthalate, which has both tensile strength and heat resistance, is preferable. The thickness of the transfer base film is not particularly limited, but is usually 3 to 100 μm, preferably 5 to 50 μm.

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

The binder resin constituting the pattern-forming agent diffusion prevention layer varies slightly depending on the type of the pattern-forming agent, but for example, cellulose-based resin, butyral resin, acrylic resin, polyurethane resin, polyester resin, vinyl chloride and vinyl acetate. From vinyl chloride resin such as vinyl alcohol, maleic anhydride, acrylic acid, etc., epoxy resin, phenol resin, melamine resin, etc., the glass transition point is a pattern forming agent. A material having a temperature higher than the heating temperature of the transfer laminate or the hot pressure press temperature at the time of diffusing the resin is preferably used. Furthermore, since the diffusion path of the pattern-forming agent is considered to be an intermolecular gap, it is preferable to add a curing agent such as a polyisocyanate compound to crosslink the resin binder molecules in order to prevent diffusion, and the layer is empty. Those that do not contain various fillers that easily form pores are preferable. Since the pattern-forming agent diffusion prevention layer also functions as a protective layer, it is preferable to use a curing agent from the viewpoint of improving durability. In particular, when a dye is used as a pattern forming agent, a hydrophilic resin having low compatibility with the dye and low dyeing property is preferable, and a resin used for a diffusion prevention layer of a sublimation dye can be preferably used. Further, considering the adhesiveness to ordinary thermoplastic resins, heat resistance, and water resistance, cellulosic resins are preferable, and among them, nitrocellulose and cellulose acetate are more preferable.

Further, soybean lecithin, microsilica, wax or the like can be added as a film modifier to the pattern-forming agent diffusion prevention layer, if necessary. Examples of the solvent used for the paint for the pattern-forming agent diffusion prevention 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. And the like, and these solvents can be used by mixing two or more kinds.

The pattern-forming agent diffusion-preventing layer is obtained by applying the diffusion-preventing layer coating material adjusted as described above onto the transfer temporary support film by a known conventional method such as a reverse method, a gravure method, or a die coating method. The thickness of the dry coating film of the pattern-forming agent diffusion prevention layer is better as it is thinner in terms of recording / reproduction characteristics, but if it is too thin, holes in which the pattern-forming agent diffuses may occur, and the pattern-forming agent can be sufficiently prevented from diffusing. It disappears. Considering the balance with strength, durability and the like, 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 (concealing layer). The colored layer contains a binder resin and a colorant as components, hides 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 used as the background for identification, it is possible to easily identify the pattern and enhance the design. Pigments used for colorants include alumina, titanium oxide, chromium oxide, iron oxide, zinc oxide, barium sulfate, etc. as inorganic pigments, and azo-based, phthalocyanine-based, quinacridone-based, perylene-based, and anthraquinone-based pigments as organic pigments. There are many types such as thioindigo type and indanthrone type, but they are not particularly limited. Further, a dye such as a phthalocyanine dye, an azo dye, a nitro dye, a quinoline dye, a methine dye, an azine dye, or a fataline dye can be used in place of or in combination with the above pigment. In addition, as a pigment capable of effectively hiding the hue of the magnetic recording layer, flaky metal powder can also be used, and as metals, aluminum, gold, silver, copper, brass, titanium, chromium, nickel, nickel chromium, and stainless steel can be used. Etc. can be used. Phosphorus flake metal powder is formed, for example, into a plate shape by a ball mill or the like, or is formed by peeling a vapor-deposited thin film. As for these shapes, the size in the plane direction is preferably 5 to 25 μm, and 10 ~ 15 μm is more preferable. The thickness is about 0.1 to 1 μm.

As the binder resin used in the paint for the colored layer, a known and commonly used binder resin can be used, and an isocyanate compound can be used for thermosetting. To facilitate the diffusion of the pattern-forming agent. For example, in addition to the binder resin described in the pattern-forming agent diffusion prevention layer, the binder resin used for the coloring layer among polyimide resin, polyamide resin, rosin-modified maleic acid resin, polystyrene resin, cellac, and alkyd resin. A Tg having a Tg lower than the temperature applied to the transfer material for diffusion of the pattern-forming agent can be preferably used. In this way, the pattern-forming agent of 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 differ depending on the type of resin used for the colored layer, but the temperature applied to the transfer material and the resin used for the colored layer can be appropriately selected and adjusted. As the solvent used for the paint for the colored layer, a known and commonly used solvent can be used, and for example, the solvent already described in the case of the protective layer can be used. For the formation of the colored layer, the colorant is mixed alone or in a solvent that dissolves the binder resin and two or more kinds, and known as a two-roll mill, a three-roll mill, a ball mill, a sand mill, a dispersion, and the like. It can be carried out by dispersing the paint by a conventional method to prepare a paint for a colored layer, applying the paint by a known conventional method such as a reverse method, a gravure coating method, and a die coating method, and drying the paint.

The film thickness of the colored layer is preferably thick to cover the brown or black color of the magnetic recording layer. However, if the film thickness of the colored layer is made too large, the spacing loss becomes large, the reproduction output characteristics deteriorate, and the possibility of error occurrence at the time of reading information increases. Therefore, the film thickness of the colored layer is preferably 2 to 5 μm, particularly preferably 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 a temporary transfer material containing, for example, a magnetic powder, a binder resin, and a solvent for dissolving the binder resin. It can be formed by coating directly on the support, on it via a pattern-forming agent diffusion prevention layer, or further on it via 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. A coercive force in the range of 20 to 320 kA / m is preferable. As the binder resin used for the magnetic recording layer, a known and commonly used binder resin can be used. For example, in general, the binder resin or the like described in the section on the colored layer can be used. It can also be thermoset using an isocyanate compound. Further, as the solvent used for the coating material for the magnetic recording layer, for example, the solvent described in the case of the protective layer can be generally used. The pattern-forming agent of the pattern-forming layer can be diffused through the magnetic recording layer to the magnetic recording reading direction, that is, to the surface of the transfer material after transfer. The speed and difficulty of diffusion differ depending on the type of resin, but 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, it is preferable that the Tg of the binder resin used for the magnetic recording layer is lower than the temperature applied to the transfer material.

If necessary, auxiliaries such as surfactants, silane coupling agents, plasticizers, waxes and silicone oils, and carbon black and other fillers can be added to the magnetic paint. The paint for the magnetic recording layer can be obtained, for example, by kneading and dispersing the above magnetic powder, binder resin, and solvent by a known and commonly used 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, dispersion, homogenizer, kneader, etc. can be used. The method for applying the paint for the magnetic recording layer is not particularly limited, and a known and commonly used coating method may be used. After applying a predetermined amount of the magnetic paint, the direction in which the magnetic powder is easily magnetized is the direction in which the magnetic recording layer is applied. Orientation treatment is performed so as to be, and drying is performed. As the coating method, for example, a gravure method, a reverse method, a transfer coater method, a kiss coater method, a die coater method and the like can be used. Further, after coating by the above coating method, it is preferable to perform the magnetic field orientation treatment before the coating film dries from the viewpoint of recording / reproducing characteristics. As the magnetic field orientation method, a known method, for example, a repulsive opposed permanent magnet, a solenoid type electromagnet, or the like can be used. The magnetic field strength is preferably in the range of 1000 to 6000 G. 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.

A heat-sensitive adhesive layer can be used for the transfer laminate used in the method for producing a magnetic recording medium of the present invention for the purpose of satisfactorily adhering the transfer laminate and the card substrate. The heat-sensitive adhesive layer generally contains a resin exhibiting heat-sensitive adhesiveness, and for example, a copolymer of vinyl chloride and vinyl acetate, or vinyl alcohol, maleic anhydride, acrylic acid, or the like is added. Examples thereof include vinyl chloride resins such as copolymers, polyester resins, acrylic resins, polyimide resins, and polyurethane resins. Further, as the solvent used for the heat-sensitive adhesive layer, for example, the solvent described in the case of the protective layer can be used. The heat-sensitive adhesive layer is made by dissolving a resin exhibiting heat-sensitive adhesiveness in a solvent, mixing and stirring to prepare a heat-sensitive adhesive paint, and applying this adhesive paint on a magnetic recording layer, such as a reverse method, a gravure method, and a die coat method. It is obtained by applying and drying according to the above method. The film 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 thermal adhesive layer in the magnetic recording reading direction, that is, in the surface direction of the transfer material. The speed and difficulty of diffusion differ depending on the type of resin used for the heat-sensitive adhesive layer, but 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, it is preferable that the Tg of the binder resin used for the heat-sensitive adhesive layer is lower than the temperature applied to the transfer material.

When a colorant is used as the pattern forming agent, the pattern can be formed in the transfer laminate used in the method for producing the magnetic recording medium of the present invention by printing using the following pattern forming ink. At this time, the pattern-forming ink contains a binder resin, a colorant, and a solvent. As the colorant of the pattern forming ink, a dye or pigment that is easily diffused can be selected from known dyes and pigments, but the dye is preferable because of the ease of diffusion by heat, and various coloring fields have been conventionally used. Known dyes used in the above can be used. It is preferable to use oil-soluble dyes such as monoazo type, disazo type, metal complex salt type, anthraquinone type, phthalocyanine type, triallylmethane type, and perylene type. Although known sublimation dyes can be used, the diffusion of the pattern-forming agent in the production method of the present invention can be carried out at a sufficient temperature and time during the transfer process when producing the magnetic recording medium. Good sublimation property for short-time diffusion required for ordinary sublimation dyes is not always necessary. Rather, it is preferable to use a dye other than the sublimation dye with an emphasis on the stability of the colorant. As the binder resin used for the pattern forming ink, a known and commonly used binder resin can be used. Examples thereof include resins used in a pattern-forming agent diffusion prevention layer, a coloring layer, a magnetic recording layer, a heat-sensitive adhesive layer, etc., which have good adhesion to a card oversheet base material and are 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 if a pattern is formed on the surface is preferable, and a binder resin used for the heat-sensitive adhesive layer having good adhesion to the oversheet. Can be preferably used. As the solvent used for the pattern forming ink, a known and commonly used solvent can be used, and for example, the solvent already described in the case of the pattern forming agent diffusion prevention layer, the coloring layer, the magnetic recording layer, and the heat-sensitive adhesive layer can be used.

The pattern forming ink is prepared by dissolving the pattern forming agent alone or in a solvent for dissolving the binder resin in a binder resin or a mixture of two or more kinds, or a two-roll mill, a three-roll mill, a ball mill, and a sand mill. , Disperser or the like, and disperse the ink by a method using a known and commonly used disperser to prepare an ink for pattern formation. Known printing methods such as gravure printing, flexo printing, offset printing, screen printing, and inkjet can be used for pattern printing, but gravure printing is particularly suitable from the viewpoint of print 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 in a reel shape, so that the film thickness difference between the non-printed area and the printed area at the time of winding. There is a possibility that the step due to the above-mentioned step becomes large and the transfer material is deformed, and the adhesiveness between the transfer material for forming the magnetic stripe and the base material is deteriorated. Therefore, the film thickness is preferably 0.5 to 5 μm, and particularly preferably 0.5 to 2.0 μm. In this way, the pattern forming ink is used to form a pattern on, for example, the heat-sensitive adhesive surface of the transfer material for magnetic stripes or the portion on the base material side for cards to which the magnetic stripes are transferred.

As a method of diffusing the pattern thus formed in the transfer material, the transfer material is present on the temporary support for transfer, and the transfer material is placed in a high temperature environment of 40 to 80 ° C for several hours to several days before the transfer process. It can be left to stand and the pattern forming agent can be diffused in advance to the temporary support side for transfer so that it can be identified from the surface side opposite to the base material of the transfer material after the transfer material is transferred. Alternatively, when a magnetic card is manufactured using the hot-pressure pressing process, the transfer material is transferred to the oversheet of the card base material, and then sandwiched between the oversheet on the opposite side of the center core and the metal plate for hot-pressure pressing 100 to 160. It is possible to heat-press for several tens of minutes to several hours at a temperature of ° C to diffuse the pattern-forming agent toward the surface of the transfer material after transfer so that it can be identified from the surface of the manufactured magnetic card. it can. When the pattern forming agent is a fluorescent agent, the method for producing the 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. A known organic fluorescent substance can be widely used as the fluorescent agent for the fluorescent pattern forming ink. As specific organic fluorescent substances, fluorescent dyes such as benzoxazole thiofin type, diaminostilbene type, imidazole type, coumarin type, naphthalimide type, and rare earth complex type are preferable because of their good diffusion. In addition, as commercially available fluorescent substances, the product name UVITEX OB manufactured by Chiba Special Chemicals, the product name Kayalight OS manufactured by Nippon Kayaku Co., Ltd., the product name Thermoplast series manufactured by BASF, the product name Fluorol series, and the product name Lumogen Series, recording material research institute company product name Lumicolor, etc. can be used. The use of fluorescent dyes is preferred in terms of ease of diffusion. The fluorescent pattern forming ink using the fluorescent agent can be produced 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. Formed by fluorescent agent When dyes and pigments for night paints, infrared paints and other functional paints are used as pattern forming agents, the above-mentioned colorants and fluorescent agents are replaced with dyes and pigments for these functional paints to replace functional inks. It can be produced and a pattern can be formed on a magnetic recording medium. For example, a colorant and a fluorescent agent may be used at the same time as these pattern forming agents, or other functional inks may be used in combination.

Hereinafter, the present invention will be described in more detail with reference to Examples and Comparative Examples, but the present invention is not limited to the Examples, and the parts below shall represent 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. The following temporary support film for transfer and each paint are used in Examples and Comparative Examples. A. Temporary support film for transfer Polyethylene terephthalate film with a thickness of 24 μm B. Fabrication of paint for the pattern-forming agent diffusion prevention layer (which also functions as a protective layer) 8 parts of cellulose acetate resin (L-20 Tg manufactured by Daicel Chemical Co., Ltd. : 187 ° C) Cellulose Acetate Acetate Propionate Resin 2 parts (Eastman Chemical Co., Ltd. "CAP-504-0.2" Tg: 159 ° C) Ethylene 25 parts Ethyl acetate 25 parts Toluene 20 parts Cyclohexanone 20 parts Polyisocyanate 4 parts (Dainippon Ink and Chemicals Co., Ltd. "Hardener No. 50 (active ingredient: 50%)" All of the above materials except polyisocyanate are stirred with a disper. After being sufficiently dissolved, the above-mentioned polyisocyanate was added, and the mixture was further stirred and homogenized with a disper to prepare a paint for a pattern-forming agent diffusion prevention layer.

C. Preparation of paint for colored layer Phosphorus flake 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) Polyurethane resin 4 parts ("TS-03" manufactured by Dainippon Ink and Chemicals Co., Ltd. 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 and Chemicals Co., Ltd.) All of the above materials except polyisocyanate are stirred with a disper to be sufficiently dissolved, and then the above. Polyisocyanate was added, and the mixture was further stirred and homogenized with a disper to prepare a paint for a colored layer.

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

E. Preparation of paint for heat-sensitive adhesive layer Polyurethane resin 1 part (Dainippon Ink and Chemicals Co., Ltd. "TS-03") Vinyl chloride-vinyl acetate copolymer resin 4 parts (Nisshin Chemical Co., Ltd. "Solvine C5" Tg : 68 ° C) MEK 45 parts Toluene 50 parts The above materials were stirred with a disper to be sufficiently dissolved and homogenized to prepare a heat-sensitive adhesive paint.

F. Preparation of pattern forming ink [A] 4 parts of amine salt of chromium complex salt dye &lt;CI solvent black 43&gt; ("Eisenspiron Black GMH Special" manufactured by Hodoya Chemical Industry Co., Ltd.) 2 parts of polyurethane resin (Dainippon Ink Chemicals) "TS-03" manufactured by Kogyo Co., Ltd.) 8 parts of vinyl chloride-vinyl acetate copolymer resin ("Solvent C5" manufactured by Nisshin Kagaku Co., Ltd.) MEK 43 parts Toluene 43 parts Stir the above materials with a disper and dissolve them sufficiently. The ink was homogenized to prepare a pattern ink [A].

G. Preparation of pattern forming ink [B] Copper phthalocyanine dye &lt;CI solvent blue 70&gt; 4 parts (BASF "Neozapon Blue 807") Polyurethane resin 2 parts (Dainippon Ink and Chemicals Co., Ltd. "TS-03") Vinyl chloride-vinyl acetate copolymer resin 8 parts ("Solvent C5" manufactured by Nissin Chemical Co., Ltd.) MEK 43 parts Toluene 43 parts Stir the above materials with a disper to sufficiently dissolve and homogenize them. [B] was prepared.

H. Preparation of pattern forming ink [C] Carbon black 10 parts (CABOT CORPORATION "REGAL99R") Vinyl chloride-vinyl acetate copolymer resin 8 parts (Union Carbide "VAGH") Polyurethane resin 2 parts (Large) Nippon Ink Chemical Industry Co., Ltd. "TS-03") MEK 40 parts Toluene 40 parts Polyisocyanate 4 parts (Dainippon Ink Chemical Industry Co., Ltd. "Hardener No. 50 (active ingredient: 50%)") Pre-kneaded meat was carried out on two rolls together with carbon black and a vinyl chloride-vinyl acetate copolymer resin, and then passed through a sand mill together with other materials to prepare a pattern ink [C].

I. Preparation of pattern forming ink [D] Copper phthalocyanine pigment 10 parts Vinyl chloride-vinyl acetate copolymer resin 8 parts (Union Carbide "VAGH") Polyurethane resin 2 parts (Dainippon Ink and Chemicals Co., Ltd. "TS" -03 ) MEK 40 parts Toluene 40 parts Polyisocyanate 4 parts (Hardener No.50 (active ingredient: 50%) manufactured by Dainippon Ink and Chemicals Co., Ltd.) Pre-kneaded meat was carried out on two rolls together with a copper phthalocyanine pigment and a vinyl chloride-vinyl acetate copolymer resin, and then passed through a sand mill together with other materials to prepare a pattern ink [D].

J. Preparation of paint for filling non-patterned parts Phosphorus flake 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) Polyurethane resin 4 parts ("TS-03" manufactured by Dainippon Ink and Chemicals Co., Ltd.) Methyl ethyl ketone 75 parts Toluene 75 parts Cyclohexanone 17 parts Polyisocyanate 5 parts ("Hardener No. 50 (active ingredient: 50%)" manufactured by Dainippon Ink and Chemicals Co., Ltd.) All of the above materials except polyisocyanate are stirred with a disper to be sufficiently dissolved, and then the above. Polyisocyanate was added, and the mixture was further stirred and homogenized with a disper to prepare a paint for a colored layer.

K. Preparation of ink for forming fluorescent patterns [A] Fluorescent substance [A] 2 parts ("UVITEX OB" manufactured by Ciba Specialty Chemicals) Polyurethane resin 2 parts ("TS-03" manufactured by Dainippon Ink and Chemicals Co., Ltd.) Vinyl chloride -Vinyl chloride copolymer resin 8 parts ("Solvine C5" manufactured by Nissin Chemical Co., Ltd.) MEK 44 parts Toluene 44 parts Stir the above materials with a disper to sufficiently dissolve and homogenize them, and ink for forming fluorescent patterns. [A] was prepared.

L. Preparation of fluorescent pattern forming ink [B] Fluorescent substance [B] 2 parts (BASF "Lumogen F Violet 570") Polyurethane resin 2 parts (Dainippon Ink and Chemicals Co., Ltd. "TS-03") Vinyl chloride -Vinyl chloride copolymer resin 8 parts ("Solvine C5" manufactured by Nissin Chemical Co., Ltd.) MEK 44 parts Toluene 44 parts Stir the above materials with a disper to sufficiently dissolve and homogenize them to form an ink for fluorescent pattern formation. [B] was prepared.

First, examples and comparative examples in which a colored dye is used as a pattern forming agent are shown below. (Example 1) A 24 μm-thick polyethylene terephthalate film is used as a temporary support for transfer, and the above-mentioned pattern-forming agent diffusion-preventing layer paint, colored layer paint, magnetic recording layer paint, etc. are used on one side of this film. And the heat-sensitive adhesive paint was applied and dried in this order using a reverse coater, and a pattern-forming agent diffusion prevention layer, a coloring layer, a magnetic recording layer, and a heat-sensitive adhesive layer were provided, respectively. The film thickness of each layer after drying was set to 1 μm for the pattern-forming agent diffusion prevention layer, 4 μm for the colored layer, 9 μm for the magnetic recording layer, and 1.5 μm for the thermal adhesive layer. As shown in FIG. 6, the pattern ink [A] was printed on the surface of the heat-sensitive adhesive layer of the transfer material prepared above by a gravure printing method so that the film thickness of the pattern portion was 1 μm. After that, it was left in a constant temperature room at 60 ° C. for 24 hours to diffuse the colorant of the pattern through the thermal adhesive layer, the magnetic recording layer, and the colored layer toward the transfer substrate of the transfer laminate. After cutting the transfer material to a predetermined width using the transfer laminate for forming magnetic stripes produced above, an oversheet for a card substrate made of polyvinyl chloride (Taipei Chemical Co., Ltd.) using a heat seal tester (manufactured by Tester Sangyo Co., Ltd.) The transfer material was transferred to (manufactured by). After that, the temporary support for transfer was removed, and a flat pressure press (test vulcanization press (manufactured by Toyo Seiki Seisakusho Co., Ltd.) was used together with the oversheet on the opposite side of the center core for the card substrate at 140 ° C, 1.3. A magnetic card Fig. 8 was prepared by hot pressing under the conditions of MPa and 20 to 30 minutes and punching into a card shape.

(Example 2) In the pattern printing of Example 1, a magnetic card was produced in the same manner as in Example 1 except that the pattern forming ink was the pattern forming ink [B]. (Example 3) In the pattern printing of Example 1, the same as in Example 1 except that the transfer laminate for magnetic stripe formation after pattern printing is not left in a high temperature chamber at 60 ° C for 24 hours. I made a magnetic card. (Example 4) In the pattern printing of Example 2, the same as in Example 2 except that the transfer laminate for magnetic stripe formation after pattern printing is not left in a high temperature chamber at 60 ° C for 24 hours. I made a magnetic card. (Example 5) In Example 1, the transfer material for magnetic stripe is prepared in the same manner as in Example 1, and as shown in FIG. 7, the magnetic stripe on the oversheet side, which is the base material for the card, is transferred for pattern printing. The part was printed by a gravure printing method using a pattern forming ink [A]. After that, a magnetic card was created in the same manner as the method for creating a magnetic card in Example 1. (Example 6) In the pattern printing of Example 5, a magnetic card was produced in the same manner as in Example 5 except that the pattern forming ink was the pattern forming ink [B].

(Comparative Example 1) A polyethylene terephthalate film having a thickness of 24 μm is used as a temporary support film for transfer, and the above-mentioned paint for the pattern-forming agent diffusion prevention layer (for protective layer) is applied on one side of this film to form a film thickness after drying. The film was applied and dried using a reverse coater so that the film thickness was 1 μm. Then, using the pattern forming ink [C], the pattern was formed by gravure printing so that the film thickness of the dried pattern was 1 μm. After that, using a gravure plate that becomes a negative pattern of the above pattern, the paint for filling the non-pattern portion is applied to a portion other than the pattern portion formed with the pattern ink [C] so that the film thickness after drying becomes 1 μm. I printed it to fit. After that, the paint for the colored layer, the paint for the magnetic recording layer, and the paint for the thermal adhesive are all applied and dried in this order using a reverse coater, and the colorant diffusion prevention layer, the colored layer, and the magnetic recording layer are applied, respectively. And a heat-sensitive adhesive layer was provided. The film thickness of each layer after drying was set to 4 μm for the colored layer, 9 μm for the magnetic recording layer, and 1.5 μm for the thermal adhesive layer. After cutting the transfer laminate for forming the magnetic stripe produced above to a predetermined width, use a heat seal tester (manufactured by Tester Sangyo Co., Ltd.) to make an oversheet for a card substrate made of polyvinyl chloride (manufactured by Taihei Kagaku Co., Ltd.). The transfer material was transferred and the temporary support for transfer was removed. After that, the oversheet is used with a flat pressure press (test vulcanization press, manufactured by Toyo Seiki Seisakusho Co., Ltd.) together with the oversheet on the opposite side of the center core for the card substrate, at 140 ° C, 1.3 MPa, 20 to 30. A magnetic card was produced by hot pressing under the condition of minutes and punching into a card shape. (Comparative Example 2) In Comparative Example 1, a magnetic card was produced in the same manner as in Comparative Example 2 except that the pattern forming ink was used as the pattern forming ink [D]. (Comparative Example 3) In Comparative Example 1, the non-patterned portion was not filled with the paint for filling the non-patterned portion, and a magnetic card was produced in the same manner as in Comparative Example 1 except for the above.

The magnetic cards of Examples 1 to 6 and Comparative Examples 1 to 3 were evaluated by the following evaluation methods. (Pattern stability) After storing for 1000 hours in a constant temperature layer at 60 ° C, the color development and shape change of the magnetic card pattern were observed. With respect to the magnetic card with a pattern produced in Examples 1 to 6, there was no change in the pattern and both the color development and the shape were maintained. (Design) The magnetic stripe part of the magnetic card was visually evaluated. : Both contrast and color development are good. The contrast is not clear or the color is insufficient. ×: The contrast is unclear and the color is insufficient.

(Variation of magnetic card output) By measuring the fluctuation of the reproduction output caused by the unevenness of the surface of the magnetic card, the level difference and the size of the unevenness of the magnetic card as a laminated body were evaluated. The obtained magnetic card conformed to ISO / IEC 7811-6, and its recording / playback characteristics were measured using MAGTESTER2000 manufactured by BARNES, and the output fluctuation was calculated by the following formula. Regarding the magnetic stripe on the magnetic card used to create this magnetic card sample, adjust the thickness of the magnetic recording layer according to each spacing so that the average output value is equal to the reference card output. Adjustments have been made. Output fluctuation (%) = ((Maximum output value-Minimum output value) / Average output value) × 100 Less than 5%. 5% or more, less than 10%. × 10% or more. (Delivery time from pattern determination and ease of pattern change) Shown by the number of processes from card completion (see Fig. 9, Fig. 10 and Fig. 11) The number of processes from pattern formation to card completion is as small as 4 or less. , It is possible to respond quickly to card delivery dates and pattern changes. × The number of processes from pattern formation to card completion is as many as 7 or more, and it takes time to complete the card, so it is not possible to respond quickly to card delivery dates and pattern changes. Δ: The number of steps from pattern formation to card completion is 5 to 6. The results are shown in Table 1.

<tables num="1"><img file="JP2006048902A_D0001.tif" /></tables>

As is clear from the results in Table 1, in Examples 1 to 6, the same design as a magnetic card having a conventional pattern can be ensured, and the dye used for pattern printing is a magnetic recording layer and a colored layer. Since the gaps are diffused and colored, the distance between the magnetic stripe surface and the magnetic recording layer does not substantially change between the pattern portion and the non-pattern portion, and the output fluctuation due to the pattern does not occur at all. In addition, since the number of steps from pattern determination to card completion is small, the delivery time can be significantly shortened, and it is possible to respond quickly to pattern changes. Further, in order to eliminate the change in spacing from the magnetic stripe surface to the magnetic recording layer, which has been conventionally used, a method of printing ink having the same hue as the colored layer (concealing layer) on the non-printing portion with a negative pattern of the printing portion. Theoretically, it is possible to match the position and height of the printing of the pattern part and the filling printing of the non-picture part, but in reality, it is affected by the elongation of the transfer base material used and so on. It is unavoidable that print alignment runout occurs in the longitudinal direction and the width direction, and it is impossible to eliminate output fluctuations. Further, in this method, the number of steps for forming the negative pattern is increased, and the number of steps from the pattern forming step to the completion of the card is large, so that it is not possible to quickly respond to the delivery date or the pattern change.

An example in which a fluorescent dye is used as a pattern forming agent is shown below. (Example 7) A 24 μm-thick polyethylene terephthalate film is used as the temporary support film for transfer, and the above-mentioned paint for the fluorescent agent diffusion prevention layer, the paint for the colored layer, and the paint for the magnetic recording layer are used on one side of the film. And the heat-sensitive adhesive paint was applied and dried in this order using a reverse coater, and a fluorescent agent diffusion prevention layer, a coloring layer, a magnetic recording layer, and a heat-sensitive adhesive layer were provided, respectively. The film thickness of each layer after drying was set to 1 μm for the fluorescent agent diffusion prevention layer, 4 μm for the colored layer, 9 μm for the magnetic recording layer, and 1.5 μm for the thermal adhesive layer. As the fluorescent pattern printing, the fluorescent pattern forming ink [A] is applied on the surface of the heat-sensitive adhesive layer of the transfer material prepared above by a gravure printing method so that the film thickness of the pattern portion becomes 1 μm. And left in a constant temperature room at 60 ° C for 24 hours. At this stage, when the temporary support for transfer was peeled off and ultraviolet rays were irradiated from the surface side of the fluorescent agent diffusion prevention layer with an ultraviolet irradiation device, a fluorescent pattern could be visually recognized. It can be seen that the fluorescent agent of the fluorescent pattern is sufficiently diffused on the transfer substrate side by the above aging step. After cutting the transfer laminate for forming the magnetic stripe produced above to a predetermined width, a heat seal tester (manufactured by Tester Sangyo Co., Ltd.) is used to transfer the transfer material to a polyvinyl chloride card substrate oversheet (manufactured by Taihei Kagaku Co., Ltd.). After transferring, remove the temporary support film for transfer, and use a flat pressure press (test vulcanization press, manufactured by Toyo Seiki Seisakusho Co., Ltd.) together with the oversheet on the opposite side of the center core for the card substrate. Temperature 130 ~ 140 ° C, pressure 20kg / cm²After heating and pressurizing for 20 to 30 minutes for 20 to 30 minutes, the magnetic card was punched into a card shape to prepare magnetic card FIG.

(Example 8) In the fluorescent pattern printing of Example 7, a magnetic card was produced in the same manner as in Example 7 except that the fluorescent pattern forming ink [A] was used as the fluorescent pattern forming ink [B]. (Example 9) In the fluorescent pattern printing of Example 7, the same as in Example 7 except that the transfer laminate for forming the magnetic stripe after the fluorescent pattern printing is not left in a constant temperature room at 60 ° C for 24 hours. And made a magnetic card. (Example 10) In the fluorescent pattern printing of Example 8, the same as in Example 8 except that the transfer laminate for forming the magnetic stripe after the fluorescent pattern printing is not left in a constant temperature room at 60 ° C for 24 hours. And made a magnetic card. (Example 11) In Example 7, the transfer laminate for forming the magnetic stripe is prepared in the same manner as in Example 7, and the fluorescent pattern printing is applied to the portion where the magnetic stripe of the card base material oversheet is transferred. Fluorescent pattern printing was performed using the fluorescent pattern forming ink [A] by a gravure printing method as shown in FIG. After that, a magnetic card was created in the same manner as the method for creating a magnetic card in Example 7. (Example 12) In the fluorescent pattern printing of Example 9, a magnetic card was produced in the same manner as in Example 7 except that the fluorescent pattern forming ink [A] was used as the fluorescent pattern forming ink [B].

(Comparative Example 4) A transparent oversheet in 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 heat-sealed at the same time by heating once to form a pre-laminated card base. Get the wood. A 188 μm-thick polyethylene terephthalate film is used as the temporary support film for transfer, and the above-mentioned paint for the fluorescent agent diffusion prevention layer, the paint for the colored layer, and the heat-sensitive adhesive paint are all applied in this order on one side of the film. It was applied and dried using a reverse coater, and a fluorescent agent diffusion prevention layer, a coloring layer, and a heat-sensitive adhesive layer were provided, respectively. The film thickness of each layer after drying was formed so that the fluorescent agent diffusion prevention layer was 1 μm, the colored layer was 4 μm, and the heat-sensitive adhesive layer was 1 μm or less. After the heat-sensitive adhesive layer was formed, the fluorescent pattern forming ink [A] was dried by a gravure printing method to form a fluorescent pattern so that the thickness after drying was 1 μm or less. In this way, a concealing layer transfer sheet with a fluorescent pattern is formed. The fluorescent pattern area side of the concealing layer transfer sheet with a fluorescent pattern is overlaid on the card base material with a magnetic recording layer prepared above, and the temperature is 120 to 130 using a flat pressure press (test vulcanization press, manufactured by Toyo Seiki Seisakusho). ° C, pressure 16-18kg / cm²After heating and pressurizing for 15 to 25 minutes to adhere the concealing layer transfer sheet for the concealing card to the card substrate with the magnetic stripe, the PET film of the transfer sheet was peeled off to prepare a magnetic card.

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

The evaluation method of the magnetic card on which the fluorescent pattern is formed will be described below. (Pattern stability) After storing for 1000 hours in a constant temperature layer at 60 ° C, the color development and shape change of the magnetic card pattern 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 the shape were maintained. (Hiding property of fluorescent pattern I) The presence or absence of fluorescent light emission of the fluorescent pattern due to ultraviolet light contained in sunlight and room light was visually evaluated under sunlight and room light. Fluorescence emission is not visible at all. Δ: Fluorescent light emission is visible, but the pattern cannot be recognized. ×: Fluorescent light emission can be visually recognized up to the pattern.

(Hiding property of fluorescent pattern II) The presence or absence of visibility of the outline of fluorescent pattern printing by visible light reflected light was visually evaluated under sunlight and room light. The outline of the fluorescent pattern cannot be visually recognized. Δ: The outline of the fluorescent pattern can be visually recognized, but the pattern cannot be visually recognized. × The fluorescent pattern can be visually recognized.

(Fluorescent emission by ultraviolet irradiation) Visually evaluate the fluorescence emission intensity of the fluorescent pattern by ultraviolet irradiation. Sufficient fluorescence emission can be obtained. Δ: Insufficient fluorescent light causes poor visibility of the fluorescent pattern. × Fluorescence is extremely weak and the shape of the pattern cannot be confirmed accurately.

(Output fluctuation) The recorded and reproduced characteristics of the obtained magnetic card were measured using MAGTESTER2000 manufactured by BARNES in accordance with ISO / IEC 7811-6, and the output fluctuation was calculated by the following formula. Regarding the magnetic stripe on the magnetic card used to create this magnetic card sample, the thickness of the magnetic recording layer is adjusted according to each spacing, and the average output value becomes equal to the reference card output. I made adjustments. Output fluctuation (%) = ((Maximum output value-Minimum output value) / Average output value) × 100 Less than 5%. 5% or more, less than 10%. × 10% or more.

<tables num="2"><img file="JP2006048902A_D0002.tif" /></tables>

As is clear from the results in Table 2, in Examples 7 to 12, the same fluorescence emission intensity as in Comparative Examples 4 and 5, which is one aspect of the conventional magnetic card having a fluorescence pattern, can be secured, and sunlight and sunlight can be secured. The fluorescent pattern is not visually recognized by the fluorescent light emitted by the ultraviolet rays contained in the room light. Further, in Examples 7 to 12, since the fluorescent agent used for the fluorescent pattern printing is diffused in the magnetic recording layer and the colored layer, in the fluorescent pattern printing, the fluorescent pattern is reflected by visible light of sunlight or room light on the colored layer. The outline of the printed portion does not give a visible deformation. Further, since the distance between the magnetic stripe surface and the magnetic recording layer does not substantially change between the fluorescent pattern portion and the non-fluorescent pattern portion, the output fluctuation due to the presence of the fluorescent pattern does not occur at all, and the output is further described in this way. Forgery prevention becomes more reliable by using the fact that no fluctuation occurs as the criterion for determining the authenticity of the card. On the other hand, in Comparative Examples 4 and 5, the concealment by the colored layer is insufficient, the fluorescence 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 existence of the fluorescent pattern cannot be concealed. Even if the film thickness of the colored layer is increased, this situation is not improved as shown in Comparative Example 6, but rather the emission intensity of fluorescence is lowered. It should be noted that the number of steps from the pattern forming process to the completion of the card is smaller than before, and it is possible to quickly respond to the delivery date and the pattern change, which is the same as in Examples 1 to 6 in which the pattern is formed using the colorant. is there.

The present invention provides a magnetic recording medium in which a pattern identifiable from the magnetic reading side is formed 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. It can be effectively used for a card-shaped 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 base material layer for a card.

<figref num="1">FIG. 5 is an enlarged cross-sectional view of a conventional magnetic card made of a transfer laminate for forming a magnetic stripe.</figref><figref num="2">It is sectional drawing which shows one aspect of the laminated body for transfer used in the manufacturing method of the magnetic recording medium of this invention.</figref><figref num="3">It is sectional drawing which conceptually showed how the pattern forming agent diffuses when the transfer laminate is aged.</figref><figref num="4">FIG. 5 is a cross-sectional view conceptually showing a case where a colored layer portion is formed on the oversheet base material side, which is one aspect of the method for producing a magnetic recording medium of the present invention.</figref><figref num="5">It is sectional drawing which shows one aspect of the magnetic card produced by the manufacturing method of the magnetic recording medium of this invention.</figref><figref num="6">It is a conceptual diagram which showed the transfer laminate for forming a magnetic stripe and the pattern formed on the transfer laminate produced in Examples 1 to 4.</figref><figref num="7">It is the schematic which showed the region which forms the pattern in Example 5 and Example 6.</figref><figref num="8">It is a schematic diagram which shows one aspect of the magnetic card which formed the pattern by using the manufacturing method of the magnetic recording medium of this invention.</figref><figref num="9">It is a figure which shows an example of the process of manufacturing a magnetic card by using the manufacturing method of the magnetic recording medium of this invention.</figref><figref num="10">It is a figure which shows another example of the process of manufacturing a magnetic card by using the manufacturing method of the magnetic recording medium of this invention.</figref><figref num="11">It is a figure which shows the conventional manufacturing method of the magnetic card which has a magnetic recording layer and a pattern.</figref>

Code description

1: Pattern-forming agent diffusion prevention layer, 2: Pattern-forming agent diffusion area, 3: Colored layer, 4: Magnetic recording layer, 5: Thermal adhesive layer, 6: Oversheet, 7: Center core, 8: On card Picture part, 9: Temporary support for transfer, 10: Picture forming part