JP2602194Y2 - Reversible thermosensitive recording medium - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a thermosensitive recording medium on which recording is performed by heating, and more particularly to a reversible thermosensitive recording medium. The present invention relates to a reversible thermosensitive recording medium provided with a barcode.

[0002]

2. Description of the Related Art As a thermosensitive recording medium, for example, a recording medium using a reversible thermosensitive recording material whose transparency reversibly changes depending on a heating temperature is known. The reversible thermosensitive recording material can be used for recording and erasing an image by using a difference in heating temperature, and has an image fixing property at room temperature. Therefore, the reversible thermosensitive recording material is used for recording an image requiring rewriting.

In such a reversible thermosensitive recording medium, in order to make characters and the like formed on the reversible thermosensitive recording layer easy to see, a mirror-deposited metal deposition layer is provided below the reversible thermosensitive recording layer, and the reversible thermosensitive recording layer is provided. The contrast of the recording layer is improved.

In the reversible thermosensitive recording medium as described above, a magnetic layer is provided as a fixed information corresponding to the recording medium in order to improve the security of the recording medium while providing magnetic recording. A code is attached and read.

[0005]

In the case of a reversible thermosensitive recording medium provided with a magnetic barcode as described above, a metal deposition layer is provided on the magnetic barcode so as to hide the magnetic barcode. . However, the magnetic barcode has a certain thickness in consideration of the output level when reading it, but since the thickness of the metal deposition layer is extremely thin compared to the thickness of the magnetic barcode, the magnetic barcode There is a problem that unevenness corresponding to the thickness of the magnetic barcode appears on the metal vapor deposited layer in the portion where is present, and the magnetic barcode is easily visually recognized.

In particular, when the metal deposited layer is mirror-finished in order to improve the contrast of the reversible thermosensitive recording layer, the unevenness of the magnetic bar code is emphasized and conspicuous by its metallic luster, so that the magnetic bar code to be concealed is extremely recognized. There is a drawback that it is easily performed.

The present invention solves the above problems,
It is an object of the present invention to provide a reversible thermosensitive recording medium having a magnetic barcode and a metal deposition layer, which makes it more difficult to visually recognize the magnetic barcode.

[0008]

According to the present invention, there is provided a reversible thermosensitive recording layer on which recording is performed by heating, and predetermined information is recorded by heating the reversible thermosensitive recording layer. With magnetic barcode, substrate and on substrate
And a magnetic bar provided on the magnetic layer
Code, a matte layer provided on the magnetic barcode and in the vicinity thereof to impart diffuse reflection properties, a metal deposition layer provided on the matte layer, and a reversible thermosensitive recording provided on the metal deposition layer And a layer.

[0009]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a reversible thermosensitive recording medium according to the present invention.

FIG. 1 shows an embodiment of a reversible thermosensitive recording medium according to the present invention. As shown in FIG. 1, the reversible thermosensitive recording medium has a matting layer 20 provided above a portion where the magnetic barcode 16 is provided. As will be described later, the matting layer 20 imparts irregular reflection characteristics and the metal deposition layer exhibits a white color, so that the unevenness of the magnetic barcode 16 appearing on the upper surface of the metal deposition layer 22 is made inconspicuous. 16 can be made more difficult to visually recognize.

This recording medium has a magnetic layer 14, a magnetic barcode 16, a smoothing layer 18, a matting layer 20, a metal deposition layer 22, a reversible thermosensitive recording layer 24, a protective layer 26, The printing layer 28 and the protective layer 30 are sequentially laminated. The magnetic barcode 16 is formed directly on a part of the magnetic layer 14, where the matting layer 20 has the area required to hide the magnetic barcode 16, ie, the magnetic barcode 16.
Is provided in a region covering the portion where the is formed and the vicinity thereof.

The base 12 is made of a material such as paper and plastic. For example, polyethylene terephthalate (PET), polyacetate, polystyrene (P
S), an epoxy resin, polyvinyl chloride (PVC), and a synthetic resin sheet or paper such as polycarbonate (PC) can be used. The thickness of the substrate 12 is usually on the order of 100 to 300 microns.

The magnetic layer 14 may be a layer generally used as a magnetic recording layer, and is made of a magnetic material which can be recorded, read or erased by a magnetic head. For example, Ba-ferrite having a particle size of 10 μm or less, preferably 0.01 to 5 μm,
r-ferrite, Co-coated γ-Fe ₂ O ₃ , γ-Fe ₂
A polyester resin, an alkyd resin, a vinyl resin, a polyurethane resin or a mixed resin thereof generally used as a binder resin can be used as a binder resin using O ₃ , acicular iron powder, and CrO ₂ .

The mixing ratio between the binder resin and the magnetic material is
It is appropriately set in consideration of the adhesiveness to the substrate 12, the strength of the coating film, the voltage detected by the magnetic head, and the like. Usually, the former / latter is in the range of 1 to 1/10 by weight, preferably 1/2.
１ ／ is appropriate. The thickness of the magnetic layer 14 is usually about 5 to 20 microns.

The magnetic bar code 16 is formed of the same material as the magnetic layer 14. The thickness of the magnetic barcode 16 is typically on the order of 5 to 10 microns.

The smooth layer 18 improves the mirror surface of the metal deposition layer 22 formed thereon, and is made of an ultraviolet-curable resin. The thickness of the smooth layer 18 is usually 1 to 5
It is on the order of microns.

Next, a specific embodiment of the smoothing layer 18 will be described. (Example 1) UV curable resin Unidic V-9080 20 parts by weight (solid content ratio 78%, manufactured by Dainippon Ink and Chemicals, Inc.) Diluent Ethyl acetate 140 parts by weight Mixing the above and UV at 120 W / cm Irradiation was performed, and the medium transport speed during the irradiation was 30 m / min to form a smooth layer.

(Example 2) UV-curable resin Unidic C7-167 20 parts by weight (solid content ratio 50%, manufactured by Dainippon Ink and Chemicals, Inc.) Diluent Ethyl acetate 100 parts by weight cm of UV light, and the medium transport speed at the time of irradiation was 30 m / min to form a smooth layer.

The matting layer 20 is a layer for concealing the magnetic barcode 16 and making the magnetic barcode 16 less visible from the surface. As an ink for printing the matte layer 20, an ink having the following composition is used. Binder 20 to 25% by weight Synthetic resin, cellulose resin or rubber resin is used,
As synthetic resins, thermoplastic resins such as vinyl, acrylic, polyester, polyamide or alkyd, amino,
Thermosetting resins such as epoxy and urethane, and cellulose fibrous resins such as nitrite, ethyl cellulose, cellulose, and acetobutylate are used as fibrous resins, and cyclized rubber and chlorinated rubber are used as rubber resins. . Pigment (matting material) 20 to 25% by weight Aluminum pigment, titanium white, silica, talc, benzoguanamine powder is used. Solvents 44 to 29% by weight Aromatic hydrocarbons, ketones, glycol ethers and esters are used. As aromatic hydrocarbons, xylene, high-boiling naphtha (# 100, # 150, # 200), and as ketones MIBK, cyclohexanone, As isophorone, diacetone alcohol, and glycol ether, methyl cellosolve, ethyl cellosolve, butyl cellosolve, methyl carbitol, ethyl carbitol, butyl carbitol, methyl sorbate acetate, ethyl sorbate acetate, carbitol acetate, and butyl acetate as an ester are used. . Thickener About 15% by weight Bentonite, clay and barium sulfate are used. Dispersant Less than 1% by weight Silicone, fluorine, carbon-based surfactant

Next, specific examples of the matting layer will be described. (Example 1) Solution blending Solid content ratio Polyurethane resin (35%) 35% 79% (N-2301 manufactured by Nippon Polyurethane Industry Co., Ltd.) Aluminum paste (64%) 5% 21% (7640NS manufactured by Toyo Aluminum Co., Ltd.) ) High boiling naphtha # 150 30% 0% Cyclohexanone 30% 0%

Example 2 Solution Formulation Solid Content Ratio Vinyl Chloride Vinyl Acetate Copolymer 16% 77% (VYHH manufactured by UCC) Aluminum paste (59%) 8% 23% (MR9000 manufactured by Asahi Chemical Industry Co., Ltd.) Isophorone 38 % 0% Butyl Cell Solve 38%
0%

The metal-deposited layer 22 is a layer for imparting contrast to the heat-sensitive recording performed on the reversible thermosensitive recording layer and making it easy to see. Formed to a thickness of

The reversible thermosensitive recording layer 24 is made of a reversible thermosensitive recording material. As a reversible thermosensitive recording material,
As described in JP-A-57-109695 and JP-A-2-187389, it is composed of a resin such as polyester and an organic low-molecular substance dispersed in the resin. In the reversible thermosensitive recording layer 24, the transparency changes because the refractive index of the organic low-molecular substance becomes equal to or different from the refractive index of the resin depending on the heating temperature. That is, as shown in FIG. 3, for example, when the state is previously cloudy at a temperature T0 or lower, and after heating from this state to a temperature T1 to T2 and then cooling to a temperature T0 or lower (arrow A), the organic low molecular substance Since the refractive index is substantially equal to the refractive index of the resin, the reversible thermosensitive recording layer 24 changes to a transparent state.

Furthermore, after heating this to a temperature T3 to T4 and then cooling it down to a temperature T0 or lower (arrow B), light is scattered because the refractive index of the organic low-molecular substance is different from the refractive index of the resin, and the reversible thermosensitive substance is obtained. The recording layer 24 changes to a cloudy state again.

As the resin used for the reversible thermosensitive recording layer 24, a resin having good transparency, excellent mechanical strength, and good film forming property is preferable. Specific examples thereof include polyvinyl chloride, vinyl chloride-vinyl acetate copolymer, vinyl chloride-vinyl acetate-vinyl alcohol copolymer, vinyl chloride-vinyl acetate-maleic acid copolymer, and vinyl chloride-acrylate copolymer. , Polyvinylidene chloride, vinylidene chloride
Examples thereof include a vinyl chloride copolymer, a vinylidene chloride-acrylonitrile copolymer, a polyester resin, a polyamide resin, an acrylic resin, and a silicone resin. Among them, particularly preferred are vinyl chloride-vinyl acetate copolymer, vinyl chloride-vinyl acetate-maleic acid copolymer,
Vinyl chloride-vinyl acetate-vinyl alcohol copolymer,
Polyester resin is applicable.

As organic low molecular weight substances, alkanols,
Alkanediol, halogenalkanol or halogenalkanediol, alkylamine, alkane, alkene, alkyne, halogenalkane, halogenalkene, halogenalkyne, cycloalkane, cycloalkene, cycloalkyne, saturated or unsaturated mono- or dicarboxylic acid or ester thereof, Amides or ammonium salts, saturated or unsaturated halogen fatty acids or their esters, amides or ammonium salts, acrylic carboxylic acids or their esters, amides or ammonium salts, halogen acrylic carboxylic acids or their esters, amides or ammonium Salts, thioalcohols, thiocarboxylic acids or their esters, amides or ammonium salts, thioalcohol carboxylic esters, etc. In, and the number of carbon atoms from 10 to 40,
The molecular weight is 100 to 700. Particularly preferred are higher fatty acids such as lauric acid, balmitic acid, stearic acid, arachiic acid, and behenic acid having a melting point in the range of 50 to 150 ° C, or esters, amides, or ammonium salts thereof.

The mixing ratio of the resin and the organic low-molecular substance is as follows:
5 parts by weight of organic low molecular weight substance to 100 parts by weight of resin
Those in the range of 200 parts are preferred, and 10 parts to 100 parts.
Parts are more preferred.

The printing layer 28 is formed by printing visible information such as desired characters and patterns.

The protective layers 26 and 30 are transparent layers for protecting the lower layers such as the print layer 28, and are formed to a required thickness. For example, cellulose resin, urethane resin, polyester resin, alkyd resin, vinyl resin,
An epoxy resin, an acrylic resin, or the like can be used. Oleoamide, stearoamide, silicone, and the like can be added to these resins to impart lubricity. In order to reduce the amount of the solvent to be used, an ultraviolet curable resin or an electron beam curable resin can be used. As the UV-curable resin, for example, acrylic, epoxy, polyester and the like can be used.

The printing layer 28 and the protective layers 26 and 30
Can be omitted as necessary.

In the above-mentioned recording medium, predetermined visible information is recorded on the reversible thermosensitive recording layer 24 by a thermal head during normal use. The recording on the reversible thermosensitive recording layer 24 utilizes the properties of the reversible thermosensitive recording material described above.
After heating up to T2, cool down to temperature T0 or less (arrow A)
This is performed by changing to a transparent state. The portion changed to the transparent state in this way is the lower metal deposition layer 22.
Because the color is visible, it becomes silver and is visually distinguished from other white turbid portions. When recording is performed again, the recording medium is heated to, for example, the temperature T3 to T4 or higher in FIG.

On the other hand, the magnetic layer 14 and the magnetic barcode 1
The information No. 6 is read by a magnetic head (not shown).

According to the above-described reversible thermosensitive recording medium, the matting layer 20 is provided above and in the vicinity of the portion where the magnetic barcode 16 is provided. As a result, it is possible to make the unevenness of the magnetic barcode appearing on the upper surface of the metal deposition layer 22 difficult and inconspicuous by visual observation.

When the magnetic bar code 16 is provided in the reversible thermosensitive recording medium provided with the metal deposition layer 22 for providing contrast to the reversible thermosensitive recording layer 24 as described above, the magnetic bar code 16 is used. Is the metal deposition layer 2
2 concealed. The magnetic barcode 16 must have a certain thickness in consideration of its output level. Therefore, as in the conventional case, the matting layer 2
0 is not provided, the unevenness of the magnetic bar code 16 is changed according to the thickness of the magnetic bar code 16.
2, and the unevenness of the magnetic barcode 16 was conspicuous due to the metallic luster of the metal deposition layer 22, and the magnetic barcode 16 was very easily recognized visually.

On the other hand, according to the recording medium of this embodiment, since the matte layer 20 is provided on the magnetic barcode 16, the metal deposition layer 22 provided on the matte layer 20 is provided.
Since diffused light is white due to diffuse reflection, the metal-deposited surface looks white when viewed from the metal-deposited layer 22 side, whereby irregularities appearing on the upper surface of the metal-deposited layer 22 can be made inconspicuous. Therefore, the magnetic bar code 16 can be made difficult to recognize visually, and the magnetic bar code 1
6 cannot be easily recognized, and security can be improved.

In the above embodiment, the recording may be performed by partially destroying the metal deposition layer 22 provided for giving the contrast of the reversible thermosensitive recording layer 24 with a thermal head. In this case, a thermoplastic resin is used as the matte layer 20. The matting layer 2
When the thermoplastic synthetic resin layer is provided on the entire surface as 0,
The smoothing layer 18 may be omitted. The present invention can also be used as a vapor-destruction-type recording medium.

FIG. 2 shows another embodiment in which the present invention is applied to a reversible thermosensitive recording medium. In the embodiment shown in FIG. 2, the magnetic barcode 16 is provided on the smoothing layer 18. The laminated structure of the other layers and the composition of each layer are the same as those in the embodiment of FIG.

Also in this embodiment, since the matte layer 20 is provided, the unevenness appearing on the upper surface of the metal deposition layer 22 is made inconspicuous, and the magnetic barcode 16 can be made difficult to recognize visually. .

[0039]

According to the reversible thermosensitive recording medium of the present invention,
A matting layer is provided above and near the magnetic barcode, and the metal deposition layer provided on the matting layer is diffusely reflected and presents white, so when viewed from the metal deposition layer surface side,
Since the whiteness is reduced by reducing the metallic luster, the unevenness of the magnetic barcode can be made inconspicuous. Therefore, the magnetic barcode cannot be easily recognized visually, and it is not easy to understand that the magnetic barcode is also provided on the medium.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an embodiment of a reversible thermosensitive recording medium according to the present invention.

FIG. 2 is a sectional view showing another embodiment of the reversible thermosensitive recording medium according to the present invention.

FIG. 3 is a diagram showing a state change of a reversible thermosensitive recording material.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 12 Base material 14 Magnetic layer 16 Magnetic barcode 18 Smooth layer 20 Matting layer 22 Metal deposition layer 24 Reversible thermosensitive recording layer 26 Protective layer 28 Printing layer 30 Protective layer

Continuation of front page (56) References JP-A-5-294951 (JP, A) JP-A-5-169843 (JP, A) JP-A-6-92020 (JP, A) JP-A-3-130188 (JP) , A) Hira 5-46472 (JP, U) (58) Fields surveyed (Int. Cl. ⁶ , DB name) B41M 5/36

Claims (3)

(57) [Scope of request for utility model registration] 1. A reversible thermosensitive recording layer on which recording is performed by heating, predetermined information is recorded by heating the reversible thermosensitive recording layer, and a magnetic barcode is provided. in the reversible thermosensitive recording medium in which information in a bar code is recorded, the reversible thermosensitive recording medium comprises a substrate, a magnetic layer provided on the substrate, the magnetic bars provided on the magnetic layer A code, a matted layer provided on and near the magnetic barcode, a metal deposited layer provided on the matted layer, and a reversible thermosensitive recording layer provided on the metal deposited layer And a reversible thermosensitive recording medium comprising: 2. The reversible thermosensitive recording medium according to claim 1, wherein a smooth layer is provided between the magnetic barcode and the matte layer. 3. The reversible thermosensitive recording medium according to claim 1, wherein the metal vapor-deposited layer is a vapor-destruction-type recording layer destroyed by a thermal head, and the matte layer is a thermoplastic resin layer. Characteristic reversible thermosensitive recording medium.