JPS6315656B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to a magnetic transfer recording medium, and in particular, it has extremely low spacing loss and excellent input/output characteristics.
The present invention relates to a magnetic transfer recording medium capable of forming magnetic recording layers imparted with various colors. Recently, it has become common practice to form magnetic recording layers on bankbooks, credit cards, computer input/output media, etc. using magnetic transfer recording materials that have a magnetic coating layer and a heat-sensitive adhesive layer on a peelable support. Although this is widely practiced, there has been a gradual increase in the demand for giving the magnetic recording layer a color different from the black to brown colors characteristic of magnetic materials due to aesthetic needs. Recently, in response to this, magnetic transfer recording media for use in bankbooks and the like have been provided in which a colored coating layer is provided directly on the magnetic coating layer. However, due to the lack of moderating power of the colored coating layer, the color of the transferred magnetic recording layer must be quite dirty. If the thickness of the coating is increased, the input/output characteristics of the magnetic recording layer will deteriorate, resulting in a disadvantage that detection errors are likely to occur. The present invention has been made in view of these points,
Therefore, an object of the present invention is to provide a magnetic transfer recording material that has extremely low spacing loss and excellent input/output characteristics, and can form a magnetic recording layer with various colors different from those of the magnetic material. It is in. As a result of intensive research, the present inventors have basically found that by providing a Sn deposited film layer on the magnetic coating layer and further providing a colored protective coating layer to protect the Sn vapor deposited film layer on top of the Sn deposited film layer. We have discovered that the above objectives can be achieved. In other words, although the Sn vapor-deposited coating layer is extremely thin, its moderating power is extremely large.
This makes it possible to completely tone down the color of the magnetic coating layer, and therefore, when a colored protective coating layer is provided on top of this, it is possible to reduce the coating thickness considerably. This coloring is effective. Therefore, a magnetic transfer recording medium having such a basic configuration can form a magnetic recording layer with extremely small spacing loss, excellent input/output characteristics, and a desired color. In addition, a magnetic transfer recording medium with a transparent protective coating layer instead of the colored protective coating layer described above has excellent input/output characteristics, and is interesting because the metallic color of the Sn vapor-deposited layer appears as it is. It has also been found that magnetic recording layers can be formed. The present invention has been completed based on this knowledge, and according to the present invention, as shown in FIG. a protective coating layer 2, provided on the protective coating layer 2 with or without an anchoring agent layer 3;
Magnetic transfer consisting of a Sn vapor deposition layer 4, a magnetic coating layer 6 provided on the Sn vapor deposition layer 4 with or without an anchoring agent layer 5, and a heat-sensitive adhesive layer 7 provided on the magnetic coating layer 6. A record will be provided. Then, as shown in FIG. 2, this magnetic transfer recording material is superimposed on a transfer material A such as a plastic sheet, plate, or paper, and these are bonded by heat and pressure using a heat press machine B. Then, a releasable support 1 is attached. When peeled off, the protective coating layer 2, the optional anchoring agent layer 3, the Sn vapor deposition layer 4, the optional anchoring agent layer 5, the magnetic coating layer 6, and the heat-sensitive adhesive layer 7 are removed. are integrally transferred to the transfer target A, thus forming a magnetic recording layer colored in a metallic color or various other colors and having excellent input/output characteristics. There are no particular limitations on the releasable support 1 as long as it can be easily peeled off from the protective coating layer 2 during transfer. For example, a plastic film such as a polyester film, a polypropylene film, a polycarbonate film, a Teflon film, or a silicone-treated release paper may be used, and the shape thereof may be a tape or a sheet. A protective coating layer 2 is provided on the peelable support 1, and the protective coating layer 2 is for protecting the Sn vapor deposition layer 4 and, if necessary, coloring it, and is transparent, opaque, or transparent. It does not matter whether it is colored or not. To form the protective coating layer 2 on the releasable support 1, the releasable support 1 is coated or printed with transparent or colored paint or ink using a roll coater, gravure printer, or the like. Examples of such transparent or colored paints or inks include ()...cellulose resins such as cellulose acetate ptylate, nitrocellulose, acrylic resins, petral resins, vinyl chloride-vinyl acetate copolymers, ()...polyester resins. ,
Urethane resins, epoxy resins, polyamide resins, etc. are used as binder components, and curing agents such as isocyanate compounds and amino resins are preferably added to these resins, and colorants, lubricants, and other auxiliary agents are added as necessary. Thermoplastic or thermosetting paints or inks can be used. Peelable support 1
It goes without saying that it is desired that the protective coating layer 2 and the protective coating layer 2 are properly adhered during normal handling and can be easily peeled off during transfer. When using a plastic film such as a polyester film, polypropylene film, or polycarbonate film, the protective coating layer 2 is preferably formed using a paint or ink containing a resin from the above group (2) as a binder component. . Paints or inks containing the resins of the group () above as binder components generally have relatively high adhesive strength to the plastic films described above, so the protective coating layer 2 formed therewith is tends to be difficult to peel off from such plastic film peelable supports. However, in this case, the support is coated with a transparent paint containing a resin from group () with good releasability as a binder component, and then painted or printed with a paint or ink containing a resin from group () as a binder component. The protective coating layer 2 may be formed by using the protective coating layer 2, or a support with good releasability such as a silicone-treated release paper may be used as the releasable support. In this way, the protective coating layer 2 may be either a single layer, a transparent layer or a colored layer, or a composite layer thereof. The thinner the protective coating layer 2 is, the better from the viewpoint of input/output characteristics, but considering the balance with strength, durability, etc.
A range of 0.1 to 5 microns is desirable. A Sn vapor deposition layer 4 is provided on the protective coating layer 2 with or without the anchoring agent layer 3, but it does not disturb the magnetic properties of the magnetic coating layer 6 and moderates the color of the magnetic coating layer. If we consider it only from the point of view, then Sn
Instead of the vapor deposited film layer 4, a vapor deposited film layer made of Mg.Al.Zn.Pt.Au.Ag or the like may also be used. However, if the vapor-deposited film layer made of these metals is in contact with the magnetic coating layer, during long-term storage, the metals in the metal-deposited film layer and the γ-iron oxide and ferrite contained in the magnetic coating layer will be absorbed. An electrochemical reaction that is thought to be caused by finger oil, moisture, etc. occurs between the metal particles and the magnetic particles, and as a result, black spots that are unsightly and detract from the aesthetic appearance often appear on the metal vapor deposited film layer. However, when Sn is used as the vapor-deposited metal, no such spots are observed. Further, the film thickness may be the minimum thickness sufficient to completely dampen the magnetic coating layer 6,
For example, it may be 100 to 1000 A°. The anchor agent layer 3 is provided on the protective coating layer 2 as necessary in order to reinforce the interlayer adhesion between the protective coating layer 2 and the Sn vapor deposition film thickness 4. A commercially available anchor agent such as a polymer type, epoxy resin type, or polyamide resin type may be coated onto the protective coating layer 2 using a roll coater to a thickness of 0.01 to 1.0 microns. A magnetic coating layer 6 is provided on the Sn vapor-deposited layer 4 with or without an anchoring agent layer 5, but in order to form the magnetic coating layer 6, for example, γ-iron oxide, Co
- A magnetic paint containing magnetic fine particles such as dove iron oxide, chromium dioxide, and ferrite may be applied onto the Sn vapor-deposited film layer 4 or the anchor agent layer 5 using a roll coater or the like. Further, the film thickness may be appropriately determined in consideration of storage capacity and the like, and is usually 5 to 20 microns. There are no particular restrictions on the magnetic paint; for example, a binder component may be a cellulose resin, a vinyl chloride resin, a vinyl chloride-vinyl acetate copolymer, a urethane resin, an epoxy resin, a polyester resin, etc., and preferably an isocyanate compound is added to these resins as a curing agent. It is sufficient to use a magnetic paint which is prepared by adding the following ingredients and, if necessary, various auxiliary agents. The anchor agent layer 5 is provided on the Sn vapor deposited film layer 4 as necessary in order to reinforce the interlayer adhesion between the Sn vapor deposited film layer 4 and the magnetic coating layer 6, and
As the anchor agent, the same anchor agent as described above may be used. A heat-sensitive adhesive layer 7 is provided on the magnetic coating layer 6, and in order to form the heat-sensitive adhesive layer 7, for example, vinyl chloride resin, vinyl acetate resin, vinyl chloride-vinyl acetate copolymer, urethane resin can be used. , acrylonitrile butadiene resin, polyester resin, cellulose resin, vinylidene chloride chloride copolymer, epoxy resin, rosin, etc., with plasticizers, auxiliary agents, etc. added as necessary, to a solution using a roll coater or the like. Or coat the magnetic coating layer 6 with a film thickness of 5 to 50 ml in a molten state.
Just apply it to a thickness of 30 microns. In the magnetic transfer recording medium of the present invention, as described above, since the colored coating layer is provided on the magnetic coating layer via the Sn vapor deposition layer, even if the layer thickness is thin, the magnetic coating layer is thin. Any coloring that is not affected by color is possible, and therefore, it is possible to form a magnetic recording layer with extremely small spacing loss and excellent input/output characteristics, and with various colors. It can be advantageously used as an input/output medium for computers. Next, the present invention will be specifically explained with reference to Examples, in which all "parts" mean "parts by weight". Example 1 [Inkey ()] [(Part) 1 Cyanine pigment 4.0 2 1/4 nitrocellulose 3.0 3 Acrylic resin ("Dianal BR-80",
Mitsubishi Rayon Co., Ltd.) 17.0 4 Low molecular weight polyethylene (molecular weight 2000) 1.0 5 Methyl ethyl ketone 37.5 6 Toluene 37.5] [Anchor agent - ()] [ (parts) 1 Vinyl chloride-vinyl acetate copolymer ("Vinyrite")
VMCH", manufactured by Union Carbide Co.) 5.0 2 Epoxy resin ("Epicote 1001", manufactured by Ciel Chemical Co., Ltd.) 5.0 3 Methyl ethyl ketone 45.0 4 Toluene 45.0" [Magnetic paint - ()] [(part) 1 Co-Fe ₃ O ₄ 30.0 2 Lecithin 0.3 3 Epoxy resin ("Epicote 834", manufactured by Ciel Chemical Co., Ltd.) 3.0 4 Vinyl chloride-vinyl acetate copolymer ("Vinyrite")
VAGH", manufactured by Union Carbide) 15.0 5 Low molecular weight polyethylene 0.3 6 Toluene 45.7 7 Methyl ethyl ketone 45.7] [Heat-sensitive adhesive - ()] [ (parts) 1 Urethane resin ("Crisbon N-183", Dainippon Ink Chemical (manufactured by Kogyo Co., Ltd.) 30.0 2 "Vinyrite VAGH" 10.0 3 Acetyl tributyl citrate 3.5 4 Methyl ethyl ketone 28.3 5 Toluene 28.2] A 25 micron thick polyester film is used as the removable support 1, and ink (
Apply protective coating layer 2 to a thickness of 1.5 microns.
is formed, and Sn is vapor-deposited thereon to a thickness of about 500 Å to form a Sn vapor-deposited film layer 4. Next, an anchor agent layer 5 was formed by applying an anchor agent () to a thickness of 0.1 microns, and then a magnetic paint () was applied to a thickness of 15 microns on top of this. A magnetic coating layer 6 was formed, and then a heat-sensitive adhesive layer 7 was formed by coating a heat-sensitive adhesive (2) to a thickness of 10 microns, thereby producing a magnetic transfer sheet. This magnetic transfer sheet was cut into a tape shape with a width of 6.5 mm, and then thermocompression bonded to a milky white PVC card with a thickness of 250 microns at 150°C for 20 minutes at 15 kg/m ² , followed by a releasable support. A magnetic recording card having a bright blue magnetic recording layer was prepared by peeling off the body 1. Table 1 shows the magnetic properties, reproduction output characteristics, and demagnetization rate of this magnetic recording card.

【table】

[Table] In addition, when the above magnetic transfer sheet and magnetic recording card are stored indoors for 6 months, changes such as spots occur in the appearance due to local electrochemical reactions between the metal vapor deposition layer and the magnetic coating layer. I investigated whether this was the case, but no changes were observed. Comparative Example 1 A 25 micron polyester film was used as a removable support, and Inky () was coated on it to a thickness of 1.5 microns to form a colored coating layer, and then magnetic paint () was applied on top of this. A magnetic coating layer is formed by coating the film to a thickness of 15 microns, and then a heat-sensitive adhesive () is applied to a film thickness of 10 microns on top of this.
A conventional magnetic transfer sheet was prepared by applying a heat-sensitive adhesive layer to form a heat-sensitive adhesive layer. Further, conventional magnetic transfer sheets were prepared in the same manner as above except that the thickness of the colored coating layer was 3.0, 6.0, and 9.0 microns, respectively. A magnetic recording card was produced in the same manner as in Example 1 using these magnetic transfer sheets. Table 2 shows the magnetic characteristics and reproduction output characteristics of these magnetic recording cards.

[Table] Comparative Example 2 In Example 1, Al, instead of vapor-deposited metal Sn,
A magnetic transfer sheet and a magnetic recording card were produced in the same manner as in the same Example except that Ag and Zn were used. Table 3 shows the magnetic characteristics and reproduction output characteristics of these magnetic recording cards. Further, this magnetic transfer sheet was stored indoors for 6 months and changes in appearance were observed. The results are shown in Table 4.

【table】

[Transparent paint-()]

[(Part) 1 Acrylic resin (“Paraloid A-11”, manufactured by Rohm and Haas Co., Ltd.) 15 2 Vinyl chloride propionate copolymer (“Electric Vinyl”, manufactured by Denki Kagaku Co., Ltd.) 5 3 Vinyl chloride vinyl acetate Copolymer (“Vinyrite”)
5 4 Low molecular weight polyethylene 1 5 Methyl ethyl ketone 37 6 Toluene 37 7 Isocyanate curing agent (Varnock D-
750'', manufactured by Dainippon Ink and Chemicals Co., Ltd.) 5 [Ink ()] [(parts) 1 Red pigment 10 2 Vinyrite VAGH 12 3 Isocyanate curing agent ("Barnok D-
750'', manufactured by Dainippon Ink and Chemicals Co., Ltd.) 5 4 Acetyltributylcytrail 2 5 Methyl ethyl ketone 35.5 6 Toluene 35.5)] [Anchor agent - ()] [ (parts) 1 Vinyl chloride-vinyl acetate copolymer ("Vinyrite")
VMCC", manufactured by Union Carbide Co.) 8 2 Methyl ethyl ketone 46 3 Toluene 46] A 25 micron thick polyester film is used as the removable support 1, and a transparent paint () is applied thereon to a film thickness of 0.5 micron. This was left indoors for 4 days to harden at room temperature, and then Inky () was applied thereon to a thickness of 1.5 microns to form a protective coating layer 2. Then,
An anchor agent layer 3 was formed by applying an anchor agent () to a thickness of 0.1 micron on this, and then a metal vapor deposition film layer 4 of Sn was formed to a thickness of about 500 Å. Next, an anchoring agent is applied on top of this.
After coating () to a thickness of 0.1 micron to form an anchor agent layer 5, magnetic paint () to a thickness of 16 microns to form a magnetic coating layer 6, and then Heat-sensitive adhesive on top of this ()
was applied to a thickness of 10 microns to form a heat-sensitive adhesive layer 7, thereby producing a magnetic transfer sheet. A magnetic recording card was produced in the same manner as in Example 1 using this magnetic transfer sheet. Table 5 shows the magnetic properties, reproduction output characteristics, and demagnetization rate of this magnetic recording card.

【table】

【table】 [Brief explanation of the drawing]

FIG. 1 is a partial sectional view showing an embodiment of the magnetic transfer recording medium of the present invention. FIG. 2 is a partial sectional view showing the transfer process of the magnetic transfer recording medium of the present invention.

Claims (1)

[Scope of Claims] 1. A removable support 1, a protective coating layer 2 provided on the releasable support 1, and a Sn vapor-deposited film layer provided on the protective coating layer 2 with or without an anchor layer 3. 4. A magnetic transfer recording body comprising a magnetic coating layer 6 provided on the Sn vapor-deposited layer 4 with or without an anchor layer 5, and a heat-sensitive adhesive layer 7 provided on the magnetic coating layer 6. 2. Claim 1, wherein the protective coating layer 2 is a transparent coating layer, a colored coating layer, or a composite coating layer thereof.
The magnetic transfer recording medium described in Section 1.