JP3887447B2 - Transfer type magnetic recording medium and method for manufacturing the same - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a transfer type magnetic recording medium, and more particularly to a transfer type magnetic recording medium suitable for use in a magnetic card with a magnetic stripe and a method for manufacturing the same.
[0002]
[Prior art]
Today, magnetic cards with magnetic stripes, represented by credit cards and cash cards, are widely used on a daily basis, and many magnetic cards with patterns, characters, etc. printed on the magnetic stripes have come to be seen. As a method for manufacturing such a magnetic card, first, a tape-shaped transfer type magnetic recording medium is transferred or bonded to a predetermined position on a support sheet as a base of the magnetic card, and heat-bonded. The substrate of the magnetic recording medium is peeled off, and a magnetic stripe is formed on the support sheet. Next, press working is performed so that the magnetic stripe is flush with the surface of the support sheet to produce a sheet with magnetic stripe. It is made by printing a specified pattern, characters, etc. on the surface of the sheet with magnetic stripe and then punching it into a card shape.
[0003]
In general, a magnetic stripe is composed of a magnetic layer and an adhesive layer, and a pattern, a character, or the like printed on the magnetic stripe is directly formed on the magnetic layer by a screen printing method. For this reason, the magnetic layer must be able to sufficiently withstand an organic solvent, a plasticizer and the like contained in the screen ink, and needs to be a thermosetting magnetic layer.
[0004]
[Problems to be solved by the invention]
As a conventional method for producing a transfer type magnetic recording medium having a thermosetting magnetic layer, a release layer and a magnetic layer are sequentially formed by a coating machine on a substrate wound in a roll shape, and then once cured in a roll shape. Perform processing. This thermosetting treatment requires about 2 days to 1 week, and then an adhesive layer is formed again using a coating machine. As described above, in the conventional method of manufacturing a transfer type magnetic recording medium having a thermosetting magnetic layer, the coating machine is run in two steps for the release layer, the magnetic layer coating, and the adhesive layer coating. Therefore, the running cost is increased accordingly, and the transfer type magnetic recording medium manufactured thereby is also relatively expensive.
[0005]
If the release layer, the magnetic layer, and the adhesive layer can be formed simultaneously in one run of the coating machine, the running cost can be reduced and an inexpensive transfer type magnetic recording medium can be provided. However, if the thermosetting magnetic layer is heat-cured after forming the adhesive layer after forming the adhesive layer, the adhesive layer and the substrate are blocked during the long-time thermosetting treatment. In order to prevent this, if the heat resistance of the adhesive layer is increased, the transfer and laminating temperature at the time of manufacturing the magnetic card increases, and the support sheet is deformed. On the other hand, if the magnetic layer is made thermoplastic and the thermosetting treatment is omitted, the magnetic layer dissolves or swells during screen printing as described above, and the magnetic recording performance deteriorates. Further, the printed pattern and characters are also deformed with the deformation of the magnetic layer.
[0006]
An object of the present invention is to provide an inexpensive transfer-type magnetic recording medium without causing the above-described problems, and to provide a manufacturing method thereof.
[0007]
[Means for Solving the Problems]
According to one feature of the present invention, in a transfer type magnetic recording medium having at least a release layer, a magnetic layer, and an adhesive layer on a substrate, the magnetic layer is a thermosetting type, and the adhesive layer has a low temperature. in are those capable of heat bonding to the adhesive layer, the following thickness of the magnetic layer, and contains a particulate resin beads having a particle size of at least the effective thickness of the adhesive layer, the resin beads are the adhesive The magnetic layer is heat-cured in the state of a roll-shaped magnetic laminate formed as a convex portion with respect to the effective thickness of the layer, and winding the release layer, the magnetic layer, and the adhesive layer in a roll shape.
[0012]
According to another feature of the present invention, in a method of manufacturing a transfer type magnetic recording medium having at least a release layer, a magnetic layer, and an adhesive layer stacked on a substrate, a roll-shaped raw material is used as the substrate. On the other hand, the release layer, the magnetic layer, and the adhesive layer are simultaneously formed by running a single coating machine and wound into a roll. The magnetic layer is a thermosetting type, and the adhesive layer is , Comprising fine resin beads having a particle diameter equal to or greater than the effective thickness of the adhesive layer, wherein the resin beads are formed as convex portions with respect to the effective thickness of the adhesive layer , and A step of performing a thermosetting treatment of the magnetic layer in the state of the roll-shaped magnetic laminate wound in the roll shape.
[0013]
[Action]
By using resin beads with a particle size equal to or greater than the effective thickness of the adhesive layer, the resin beads are formed as protrusions with respect to the effective thickness of the adhesive layer, and a thermosetting treatment is performed in a roll shape without blocking the substrate and the adhesive layer. Therefore, the release layer, magnetic layer, and adhesive layer can be formed simultaneously at the same time by running a single coating machine, and inexpensive transfer with a thermosetting magnetic layer without increasing the heat resistance of the adhesive layer. Type magnetic recording medium can be provided.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
Next, based on an accompanying drawing, the present invention is explained in detail about an embodiment of the present invention.
[0015]
FIG. 1 is an enlarged sectional view of a transfer type magnetic recording medium as an embodiment of the present invention. As shown in FIG. 1, the transfer type magnetic recording medium of this embodiment has a release layer 2, a magnetic layer 3, and an adhesive layer 4 sequentially laminated on a substrate 1. According to the present invention, the adhesive layer 4 contains resin beads 5 having a particle diameter equal to or larger than the effective thickness t of the adhesive layer 4.
[0016]
The substrate 1 of the transfer type magnetic sheet of the present invention is not particularly limited, such as plastic, paper, metal plate, etc., but polyethylene terephthalate is preferable among plastics because of its heat resistance and ease of use.
[0017]
The release layer 2 is made of a paint obtained by dissolving and mixing a silicone resin, a cellulose derivative fiber-based resin, a polyvinyl butyral resin, a polymethacrylate and a copolymer thereof in a solvent with silicone oil, wax, silica, etc. as necessary. It is prepared and applied at a thickness that provides an appropriate peel strength.
[0018]
The magnetic layer 3 is a thermosetting type, and magnetic powder used for normal magnetic recording such as γ-Fe ₂ O ₃ , Co-coated γ-Fe ₂ O ₃ , Ba ferrite, SR ferrite, etc. is used as a binder, a curing agent, In addition, a magnetic paint uniformly mixed in an additive and a solvent is prepared, and applied to a thickness that provides appropriate magnetic recording performance. However, if the magnetic layer 3 is not 20 μm or less, the magnetic recording performance is deteriorated, in particular, the resolution is lowered. The binder may be a polyurethane resin, a vinyl chloride-vinyl acetate copolymer, a polyester resin, an epoxy resin, an acrylic resin, a phenol resin, or the like, and the curing agent is a conventionally known isocyanate curing agent, epoxy curing agent, or the like. It may be a thing.
[0019]
The adhesive layer 4 is made of a resin such as vinyl chloride-vinyl acetate-vinyl alcohol copolymer, polyvinyl acetate resin, polyamide resin, polyurethane resin, polyester resin, etc., resin beads 5 and other additives in a solvent. A coating material uniformly mixed is prepared and applied to a thickness that provides an appropriate adhesive strength. However, in order to stabilize the adhesive force during heat bonding, the effective thickness of the adhesive layer 4 excluding the resin beads 5 needs to be 0.5 μm or more.
[0020]
The resin beads 5 contained in the adhesive layer 4 according to the present invention include tetrafluoroethylene resin, silicone resin, polyethylene resin, polypropylene resin, polycarbonate resin, ethylene-vinyl acetate copolymer, acrylic-styrene copolymer, benzoguanamine- Fine particles such as formaldehyde condensate, melamine-formaldehyde condensate, and nylon are used, and resin beads having low surface activity such as tetrafluoroethylene resin and silicone resin are particularly preferable.
[0021]
The adhesive layer 4 does not block the substrate 1 during the thermosetting treatment in a roll shape, and needs to be stably adhered at a heating adhesion temperature at which the support sheet is not deformed by transfer and lamination at the time of magnetic card manufacture. In order to solve this, fine resin beads 5 are contained in the adhesive layer 4, and the particle diameter of the resin beads 5 is set to be not less than the effective thickness t of the adhesive layer 4 and not more than the film thickness of the magnetic layer 3. When resin beads having a particle diameter equal to or less than the effective thickness t of the adhesive layer 4 are used as in Comparative Example 2 described later, the resin beads are buried in the adhesive, and when wound into a roll, the base 1 and the adhesive Will be in direct contact and will block during the thermosetting process in roll form. As described above, by using the resin beads 5 having a particle diameter equal to or larger than the effective thickness t of the adhesive layer 4, the resin beads 5 are formed as convex portions with respect to the effective thickness t of the adhesive layer 4, and wound in a roll shape. In this case, it is possible to prevent the base 1 and the adhesive from coming into direct contact and to heat-treat the adhesive layer that can be heated and bonded at a low temperature in a roll shape. Further, as in Comparative Example 3 to be described later, if the particle size of the resin beads is too large, the magnetic recording performance after making the magnetic card, especially the level fluctuation of the reproduction output, is poor, resulting in a reading error. As a certain size, since it is embedded in the support of the magnetic card, the size that does not adversely affect the magnetic recording performance was confirmed by experiments, and it was found that the particle size was less than the thickness of the magnetic layer. Accordingly, the particle diameter of the resin beads 5 is preferably 0.5 μm or more and 20 μm or less.
[0022]
In the transfer type magnetic recording medium of the embodiment shown in FIG. 1, the magnetic layer 3 is directly stacked on the release layer 2, but a protective layer, between the release layer 2 and the magnetic layer 3, Even if the present invention is applied to a transfer type magnetic recording medium provided with a vapor deposition layer, a concealing layer, a colored layer, etc., the effects of the present invention can be obtained.
[0023]
In order to confirm the effect of the present invention, the following results were obtained by producing the transfer type magnetic recording media of Example 1 and Comparative Examples 1, 2, 3, and 4 according to the present invention as follows. This will be described below.
[0024]
Example 1
As the substrate 1, polyethylene terephthalate having a thickness of 22 μm was used as a roll-shaped raw material having a width of 1 m and a length of 2000 m. A release layer 2, a magnetic layer 3 and an adhesive layer 4 having the following composition are simultaneously formed on the original fabric by a single coating machine so that the thickness is 1 μm, 15 μm, and the effective thickness is less than 2 μm. It was wound up and heat-cured. The curing conditions were 70 ° C. and 72 hours. Thereby, a transfer type magnetic recording medium as a roll-shaped magnetic laminate was produced.
[0025]
Release layer composition silicone resin A (KS707 manufactured by Shin-Etsu Chemical Co., Ltd.) 5 (parts by weight)
Silicone resin B (KS770A manufactured by Shin-Etsu Chemical Co., Ltd.) 5
Methyl ethyl ketone 45
Toluene 45
[0026]
Magnetic layer composition magnetic powder (CTX-860 manufactured by Toda Kogyo Co., Ltd.) 50 (parts by weight)
Phosphate ester surfactant 1
Vinyl chloride-vinyl acetate-vinyl alcohol copolymer 4
(S-LEC A manufactured by Sekisui Chemical Co., Ltd.)
Urethane resin 6
(Nipporan 2304 manufactured by Nippon Polyurethane Industry Co., Ltd.)
Isocyanate compound 3
(Nihon Polyurethane Industry Co., Ltd. Coronate L)
Methyl ethyl ketone 36
[0027]
Adhesive layer composition Vinyl chloride-vinyl propionate copolymer 25 (parts by weight)
(Loulon QC640 manufactured by Tosoh Corporation)
Resin beads 2.5
(Silicone resin particle size 2μm)
Methyl ethyl ketone 72.5
[0028]
(Comparative Example 1)
In the same manner as in Example 1, the adhesive layer was changed to the following composition to produce an adhesive layer containing no resin beads.
Adhesive layer composition Vinyl chloride-vinyl propionate copolymer 25 (parts by weight)
(Loulon QC640 manufactured by Tosoh Corporation)
Methyl ethyl ketone 75
[0029]
(Comparative Example 2)
In the same manner as in Example 1, the adhesive layer was changed to the following composition, and an adhesive layer in which the particle size of the resin beads was not more than the effective thickness of the adhesive layer was produced.
Adhesive layer composition Vinyl chloride-vinyl propionate copolymer 25 (parts by weight)
(Loulon QC640 manufactured by Tosoh Corporation)
Resin beads 2.5
(Silicone resin particle size 0.5μm)
Methyl ethyl ketone 72.5
[0030]
(Comparative Example 3)
In the same manner as in Example 1, the adhesive layer was changed to the following composition, and an adhesive layer having a resin bead particle size equal to or larger than the thickness of the magnetic layer was produced.
Adhesive layer composition Vinyl chloride-vinyl propionate copolymer 25 (parts by weight)
(Loulon QC640 manufactured by Tosoh Corporation)
Resin beads 2.5
(Crosslinked polystyrene resin particle size 25μm)
Methyl ethyl ketone 72.5
[0031]
(Comparative Example 4)
In the same manner as in Example 1, the magnetic layer was changed to the following composition to produce a thermoplastic magnetic layer.
Magnetic layer composition magnetic powder (CTX-860 manufactured by Toda Kogyo Co., Ltd.) 50 (parts by weight)
Phosphate ester surfactant 1
Vinyl chloride-vinyl acetate-vinyl alcohol copolymer 4
(S-LEC A manufactured by Sekisui Chemical Co., Ltd.)
Urethane resin 6
(Nipporan 2304 manufactured by Nippon Polyurethane Industry Co., Ltd.)
Methyl ethyl ketone 39
[0032]
The transfer type magnetic recording media of Example 1 and Comparative Examples 1, 2, 3 and 4 as described above were slit into a tape shape with a width of 25.4 mm to produce a transfer type magnetic tape. At this time, the blocking state was confirmed. did. Next, this transfer-type magnetic tape was heated and transferred onto a magnetic card support to produce a magnetic sheet with stripes. At this time, the transfer temperature and adhesiveness, and deformation of the support were confirmed. Finally, an appropriate pattern was printed on the magnetic sheet with stripes by screen printing, and the deformation of the pattern and the magnetic characteristics (level fluctuation) were confirmed. FIG. 2 shows a table that summarizes the results of these experiments. In this table, a circle indicates that the confirmation item is good.
[0033]
【The invention's effect】
According to the present invention, a release layer, a magnetic layer, and an adhesive layer can be simultaneously formed by running a single coating machine, and by making the fine resin beads in the adhesive layer more than the effective thickness of the adhesive, Thus, it is possible to prevent the substrate and the adhesive from coming into direct contact with each other, and to form an adhesive layer that adheres stably at a heating adhesive temperature at which the support sheet is not deformed by transfer or lamination during magnetic card manufacture. Furthermore, the magnetic layer can be a thermosetting type, and even when a pattern or character is printed, the pattern is not deformed and the magnetic recording performance is not deteriorated, and the transfer type magnetic recording medium is highly reliable and low cost. Can provide.
[Brief description of the drawings]
FIG. 1 is an enlarged cross-sectional view of a transfer type magnetic recording medium as an embodiment of the present invention.
FIG. 2 is a diagram showing a table collectively showing experimental results.
[Explanation of symbols]
1 Base 2 Release Layer 3 Magnetic Layer 4 Adhesive Layer 5 Resin Bead

Claims (2)

In a transfer type magnetic recording medium having at least a release layer, a magnetic layer, and an adhesive layer superimposed on a substrate, the magnetic layer is a thermosetting type, and the adhesive layer is capable of being thermally bonded at a low temperature, The adhesive layer contains fine resin beads having a particle diameter equal to or smaller than the thickness of the magnetic layer and equal to or greater than the effective thickness of the adhesive layer, and the resin beads are convex to the effective thickness of the adhesive layer. A transfer-type magnetic recording medium , wherein the magnetic layer is heat-cured in the state of a roll-like magnetic laminate formed by winding the release layer, magnetic layer, and adhesive layer into a roll . In a method for producing a transfer type magnetic recording medium having at least a release layer, a magnetic layer, and an adhesive layer on a substrate, a roll-shaped original fabric is used as the substrate, and the release layer, magnetic layer, and adhesive are formed on the original fabric. Including a step of simultaneously forming a layer by running a single coating machine and winding it into a roll, wherein the magnetic layer is a thermosetting type, and the adhesive layer has a particle diameter equal to or greater than the effective thickness of the adhesive layer. The resin beads are formed as convex portions with respect to the effective thickness of the adhesive layer, and are further formed into a roll-shaped magnetic laminate wound into the roll shape. A method of manufacturing a transfer type magnetic recording medium, comprising the step of performing a thermosetting treatment of the magnetic layer in the state of an object.

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