JPH02201728A - Transfer type magnetic tape - Google Patents

Abstract

PURPOSE:To obtain a transfer type magnetic tape having excellent solvent resistance without degrading electromagnetic conversion characteristics and adhesion of printings by providing a resin layer comprising a thermosetting resin between the magnetic layer and the adhesive layer. CONSTITUTION:On a base film 1, a peeling layer 2 is provided, on which a magnetic layer 3 is formed by coating with magnetic powder such as gamma-Fe2O3 together with a binder such as vinyl chloride-vinyl acetate copolymer or polyurethane resin. Further, a thermosetting type clear layer 4 and adhesive layer 5 comprising a thermoplastic resin such as polyester, vinyl chloride, etc., are formed. In this production process of the tape, part of the thermosetting resin intrudes into the magnetic layer 3 to fill it. Thereby, the transfer type magnetic tape 6 having excellent solvent resistance can be obtained without degrading the electromagnetic conversion characteristics and adhesion of printing.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a transfer type magnetic tape, and in particular to a transfer type magnetic tape used for concealed design cards with patterns such as letters and designs on the surface of the card. Concerning tape improvements.

[Prior Art] Hidden magnetic cards have traditionally been made of white four-layer PvC with oversheets laminated on both sides of the center core.
Magnetic tape is heat-adhered by transfer or bonding to a predetermined position on the base material, and after peeling off the base film, press processing is performed, and then a hiding layer, a colored layer, a pattern layer, etc. are sequentially laminated by means such as printing. It is what it is.

In addition, a color magnetic tape with a colored layer is heat-adhered to a predetermined position on the base material, and after pressing, designs such as letters and pictures are printed on the magnetic stripe, and then a protective layer is printed on the entire surface. Formed design magnetic cards have also been proposed.

In a magnetic card with the above design, a concealing layer, a colored layer, etc. are laminated on top of a magnetic tape that is pressed onto a base material due to the manufacturing process. For this reason, the organic solvents contained in each ink penetrate into the porous magnetic layer, dissolve the binder resin, and damage the magnetic layer, resulting in a decrease in magnetic properties (and other negative effects on the magnetic tape). It is known that

In order to deal with this problem, it is known to provide a surface protective layer 10 on the magnetic layer 3 of the transfer type magnetic tape (underneath the magnetic layer before transfer) as shown in FIG. However, these methods do not improve the solvent resistance of the magnetic layer itself (and may cause deterioration of printing adhesion between the surface protective layer and ink, or electromagnetic problems such as gap loss between the magnetic head and the magnetic layer). It has the disadvantage that it tends to cause deterioration of the conversion characteristics.Also, there have been attempts to increase the proportion of binder in the magnetic paint in order to impart solvent resistance, but it has the disadvantage that it is difficult to obtain sufficient magnetic characteristics.

[Problems to be Solved by the Invention] An object of the present invention is to provide a transfer type magnetic tape that has excellent solvent resistance without degrading electromagnetic conversion characteristics or printing adhesion.

[Means and effects for solving the problem] The present inventors
As a result of intensive study to resolve the above-mentioned issues,
In a transfer type magnetic tape in which at least a release layer, a magnetic layer, and an adhesive layer are sequentially formed on a base film, a resin layer (hereinafter referred to as a clear layer) formed of a thermosetting resin is placed between the magnetic layer and the adhesive layer. By providing layers (called layers),
The inventors have discovered that the above problems can be solved and have arrived at the present invention.

Hereinafter, the present invention will be described in detail with reference to the drawings.

FIG. 1 shows an example of a transfer type magnetic tape 6 of the present invention, in which a release layer 2 is provided on a base film 1 made of polyester, acetate, polycarbonate, etc., and a magnetic powder such as γ-Fe20s is applied on this layer. The magnetic layer 3 is formed by coating the material along with a binder such as a vinyl chloride-vinyl acetate copolymer or a polyurethane resin. A thermosetting clear layer 4 is provided thereon, and an adhesive layer 5 made of a thermoplastic resin such as polyester or vinyl chloride is further provided.

The above-mentioned clear layer 4 is prepared by dissolving a thermosetting resin in a solvent to a predetermined solid content, and then mixing and stirring an appropriate amount of a curing agent as needed to prepare a coating material, and applying it on the magnetic layer 3 to a dry thickness of 0.5 mm. 5
It is formed by coating and drying to a thickness of ~5 μm.

If a clear layer is provided on the base film before the magnetic layer in the process of manufacturing a transfer magnetic tape, the magnetic layer will be placed on the clear layer in a hardened state, and the porous magnetic layer will Since the clear layer does not penetrate into the magnetic layer, the solvent resistance of the magnetic layer itself is not improved, which is inconvenient.

Further, such a layer structure causes a problem of gap loss between the magnetic head and the magnetic layer. On the other hand, by adopting the layer structure of the present invention, a part of the thermosetting resin enters the magnetic layer during the tape manufacturing process, forming a filled state in the magnetic layer, and the solvent resistance of the magnetic layer itself increases. This improves durability and makes it resistant to printing ink solvents used in subsequent processes.

Furthermore, since the clear layer is formed under the magnetic layer, the problem of gap loss mentioned above is also solved.

The thermosetting resin forming the clear layer is not particularly limited as long as it has good adhesion to silk ink or gravure ink and is solvent resistant.

Examples include polyester, alkyd, polyurethane, and acrylic. In addition, it is particularly preferable to select a resin that is highly compatible with the bindu resin (vinyl chloride vinyl acetate copolymer, polyurethane resin, etc.) in the magnetic layer. This is because poor compatibility results in cloudy separation and brittleness after drying.

The curing agent may be one that reacts with the functional group of the resin (specific examples include diethyltriamine, metaphenylenediamine, hexahydrofucuric anhydride, dodecenylsuccinic anhydride, etc.).

The solvent is not particularly limited, as long as it dissolves the resin and curing agent used (specifically, methyl ethyl ketone, toluene, cyclohexanone, acetate,
Examples include xylene.

The transfer magnetic tape 6 obtained as described above is placed on a transfer object 7 made of various plastic sheets such as hard polyvinyl chloride or polyester film, paper, cloth, etc., with the adhesive layer 5 side placed on the surface of the transfer object 7. Overlap so that they are facing each other,
As shown in FIG. 2, after pressing with a heated silicone rubber roller 9, the base film 1 is peeled off and the striped adhesive layer 5, clear layer 4, and magnetic layer 3 are transferred onto the transfer target 7. Thereafter, as shown in FIG. 3, the transferred magnetic tape is heat-pressed using a press plate 8 to obtain a magnetic recording medium such as a magnetic card as shown in FIGS. 4(al and bl). Here, the figure (a) shows the transferred object 7.
is composed of polyester film,
Further, (bl) indicates the case where the transfer target 7 is made of hard polyvinyl chloride.

Depending on the application, it may be applied on the magnetic layer or on the entire surface of the card.
A character background pattern layer, a colored layer, a concealing layer, etc. can be arbitrarily selected and provided.

[Example] The present invention will be explained with reference to Examples, where parts mean parts by weight.

Supporting base film (25pm thick polyester film)
A release layer was formed by applying and drying a paint having the composition shown below to a dry thickness of about 0.5 pm.

On this release layer, apply a magnetic paint having the following composition to a dry thickness of approximately 10
A magnetic layer was formed by coating and drying to obtain Pm.

Next, a paint having the following composition was coated on the magnetic layer to a dry thickness of 2 pm and dried to form a clear layer.

Furthermore, on the clear layer, adhesive paint fVMcHUCC)
A transfer type magnetic tape was obtained by coating and drying to a dry thickness of about 2 gm to form an adhesive layer.

The following composition was used as the K-tan seal clear layer paint, and the thickness was 2.
A transfer type magnetic tape was obtained in the same manner as in Example 1 except that pm was used.

Use the following composition as the clear layer paint, and make the thickness 2.
A transfer type magnetic tape was obtained in the same manner as in Example 1 except that pm was used.

Use the following composition as the clear layer paint, and make the thickness 2.
A transfer type magnetic tape was obtained in the same manner as in Example 1 except that pm was used.

A transfer type magnetic tape was obtained in the same manner as in Example 1 except that no clear layer was provided.

Each of the obtained transfer type magnetic tapes was slit to a width of 6.5 mm, and this was placed on a transfer object made of vinyl chloride film so that the surface of the adhesive layer was in contact with the surface of the transfer object. The film was pressed for about 2 seconds with a heated silicone rubber roller at a temperature of 90° C. and a pressure of 5 kg 7 cm 2 to temporarily bond it to the object to be transferred. Thereafter, the base film was peeled off and a striped magnetic tape was transferred onto the transfer target. The object to be transferred having the magnetic tape thermally transferred in this way was sandwiched between stainless steel mirror plates and heat pressed for 10 minutes at a temperature of 135°C and a pressure of 17 kg/cm2, and then cut out to the size of a card in Examples 1 to 4. And a magnetic card of Comparative Example 1 was obtained.

Next, in order to examine the solvent resistance of the magnetic tape on the magnetic card described above, methyl ethyl ketone was dropped onto the surface of the tape and the number of seconds after which it was immersed was measured. The results were as follows.

(Left below) Comparative Example 1 in which no clear layer was provided had poor solvent resistance, but it was found that by providing a clear layer as in Examples 1 to 4, the solvent resistance was significantly improved.

112.3 In order to investigate the electromagnetic conversion characteristics, the following three types of magnetic cards were prepared.

Sample A: Magnetic card surface protective layer (2 μm) with a magnetic tape attached with a surface protective layer on the magnetic layer (manufactured by VYHHfUcc) 10 parts Methyl isobutyl ketone 30 parts Toluene 30 parts Cyclohexanone 10 parts Magnetic layer (10 parts) Part m) Adhesive layer f2I as in Example 1
Lm) Similar to Example 1, 6 magnetic tapes with the above configuration were used.
．． A 5 mm wide piece is coated with a slurry, and this is heat-transferred, heat-pressed, and punched onto a vinyl chloride transfer material to obtain a magnetic card.

Sample B: A card with a magnetic tape pasted using the clear layer of Example 4. Sample G: A card with a magnetic tape pasted with neither a clear layer nor a surface protective layer. And magnetic cards of Samples A, B, and C. After printing of the same thickness (5 pm) was applied on each layer, the electromagnetic conversion characteristics (reproduction output characteristics) were measured. The results were as follows.

(Margins below) First, when comparing Samples A and B, as is clear from the table, since Sample A has a surface protective layer formed, Sa
Output is lower than mple B.

Next, when comparing Samples B and C, Sample
C has a small gap loss, but since a clear layer is not formed, the magnetic tape containing the magnetic layer is degraded (stretched) by the solvent, and the output is quite low as shown in the table.

[Effects of the Invention] According to the present invention, since the layer that protects the magnetic layer is formed under the magnetic layer, there is no need to form a protective layer on the magnetic layer as in conventional magnetic tapes, and Since the solvent resistance can be improved without increasing the proportion of bangu in the paint, it is possible to provide a designed magnetic card with good electromagnetic conversion characteristics, improved adhesion with ink, and a good printed appearance. .

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing an example of the transfer type magnetic tape of the present invention;
Figure 2 is a cross-sectional view of the transfer magnetic tape shown in Figure 1 being thermally transferred to a transfer target and the substrate being peeled off, and Figure 3 is the temporarily bonded transfer magnetic tape shown in Figure 2 heated by a press plate. FIG. 4 is a cross-sectional view of the transfer type magnetic tape of the present invention after hot pressing; FIG.
The figure is an explanatory diagram of a conventional transfer type magnetic tape.

Claims (1)

[Claims] (1) In a transfer magnetic tape in which at least a release layer, a magnetic layer, and an adhesive layer are sequentially formed on a base film,
A transfer type magnetic tape characterized in that a resin layer made of a thermosetting resin is provided between a magnetic layer and an adhesive layer.