JPH06191162A - Heat transfer material - Google Patents

Abstract

PURPOSE:To provide a heat transfer material capable of forming easily an infrared absorption pattern in an arbitrary form wherein though mechanical read-out is possible by an infrared readout device, visual observation is difficult. CONSTITUTION:In a heat transfer material 10, its principal part is constituted of a base sheet 11, peeling layer 12 and heat transfer layer 13. Then an infrared absorption pigment or infrared absorption dyes containing Fe<2+> and/or Cu<2+> as an infrared absorption substance having the same color as blue colored paper of an infrared reflective base is contained within the heat transfer layer 13. Therefore, an infrared absorption pattern having an arbitrary form can be formed easily on blue colored paper through a thermal head by making use of the heat transfer material 10 and though visual observation of the infrared absorption pattern becomes difficult since the infrared absorption substance contained within the infrared absorption pattern and the blue colored paper have the same color, mechanical readout by an infrared readout device becomes possible.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a thermal transfer material used for forming an infrared absorption pattern such as a bar code pattern or a secret information pattern that can be mechanically read by an infrared reading device, and in particular, the above mechanical reading is possible. The present invention relates to a thermal transfer material capable of easily forming an infrared absorption pattern having an arbitrary shape that is difficult to visually observe.

[0002]

2. Description of the Related Art Infrared absorption patterns of this kind have hitherto been
A printing ink containing an infrared absorbing substance such as carbon black or leuco dye is used to print on a band pattern on a white base paper a constituting the outer surface of a book or the like to form an infrared absorbing part b1 and an infrared non-printing material. The infrared detecting bar code b and the like including the absorbing portion a1 were configured (see FIG. 3).

When applied to objects requiring security, such as securities and ID cards, the infrared absorption pattern is formed in an arbitrary shape by a thermal transfer means using a thermal transfer material, and not a fixed information pattern. A variable information pattern is used to improve security.

By the way, since the infrared absorbing substances such as carbon black and leuco dyes have a light absorbing property even in a visible light region, the infrared pattern is a pattern which can be mechanically read by an infrared reading device and visually recognized. It was

Therefore, when it is applied to a book or the like, its design may be adversely affected, and when it is applied to a subject requiring security such as the above-mentioned securities and ID card, it is forged or counterfeited. It had the drawback that it could easily be the target of falsification.

Therefore, conventionally, a process ink (yellow, magenta, yellow, magenta, etc.) having a property of transmitting infrared rays but not visible light to the infrared absorption pattern is used.
(Cyan) to make color matching difficult to make the above pattern visible, or to mix the above process inks at an appropriate ratio to obtain a gray or black type ink, and to hide the infrared absorption pattern with this ink to make it visible. The method of making it difficult was adopted. (JP-A-58-1
34782 and JP-A-58-171995).

[0007]

However, when such a method is adopted, another step such as printing for color matching using the above process ink or printing step of the concealing portion is required after forming the infrared absorption pattern. Therefore, there is a problem that the forming process becomes complicated by that much, and when the concealing portion is formed, the concealing portion is exposed on the surface, so that the design is easily restricted and its application There is a problem that the target is limited, and the existence of the above-mentioned concealing portion makes it easy to imagine the existence of an infrared absorption pattern, and as with the case where the above pattern is visually observed, there is a risk of forgery and falsification. The solution is insufficient.

[0008] The present invention has been made in view of such problems, and its object, the machine readable is susceptible can easily form the infrared absorption pattern of the flame any shape frame is visually To provide a thermal transfer material.

[0009]

That is, the invention according to claim 1 is premised on a thermal transfer material for thermally transferring a thermal transfer layer provided on a base sheet to form an infrared absorption pattern on an infrared reflective substrate, The thermal transfer layer contains an infrared absorbing substance of the same color type as the infrared reflective substrate, while the invention according to claim 2 is
Assuming that the thermal transfer layer provided on the base sheet is thermally transferred to form an infrared absorption pattern on the infrared reflective substrate, the thermal transfer layer is formed in the thermal transfer layer in the same color system as the infrared reflective substrate. It is characterized by containing a coloring pigment or dye together with the infrared absorbing substance.

According to the thermal transfer material of the present invention, an infrared absorption pattern of an arbitrary shape can be easily formed on the infrared reflective substrate by a heating means such as a thermal head, and the infrared transfer substrate can be formed on the infrared reflective substrate. Since the partially transferred thermal transfer layer contains an infrared absorbing substance, it can be mechanically read by an infrared reading device, and the infrared absorbing substance is composed of a material of the same color as the infrared reflecting substrate. Therefore, it is difficult to visually observe the infrared absorption pattern without forming a hiding layer or the like using the process ink as in the conventional case.

According to the thermal transfer material of the second aspect, as in the first aspect of the invention, an infrared absorption pattern having an arbitrary shape can be easily formed on the infrared reflective substrate by a heating means such as a thermal head. At the same time, since the infrared transfer material is contained in the thermal transfer layer partially transferred onto the infrared reflective substrate, mechanical reading by the infrared reading device is possible, and the thermal transfer containing the infrared absorption material is possible. Since the layer contains a coloring pigment or dye and is adjusted to be the same color as the infrared reflective substrate, it is difficult to visually check the infrared absorption pattern without forming a hiding layer using process ink as in the past. Becomes

In such a technical means, the main part of the thermal transfer material is composed of the base sheet and the thermal transfer layer.

First, any plastic film can be applied as the base sheet, and examples thereof include polyolefin resins such as polyethylene and polypropylene, polyester resins, polycarbonate resins, polyvinyl chloride and chlorinated polyvinyl chloride obtained by further chlorinating the same. Examples of the film or sheet include a vinyl chloride resin, an acrylonitrile-butadiene-styrene copolymer resin, and the like.

Further, a release layer for facilitating the release from the base sheet with the thermal transfer element may be provided on the base sheet. Examples of the material applicable to such a release layer include waxes having a melting point of 60 to 120 ° C. when the thermal transfer layer is thermally transferred by a thermal head. Specific examples thereof include paraffin wax, carnauba wax, montan wax, higher fatty acid, higher alcohol, higher fatty acid amide, and higher fatty acid ester. It is also possible to apply a low softening point resin having a softening point of 60 to 150 ° C. Such a low softening point resin is usually a resin material having a molecular weight of 500 to 5000, and examples thereof include epoxy resin, low molecular weight polystyrene, ethylene-vinyl acetate copolymer, polyamide resin,
Examples thereof include polyester resin and petroleum resin. A mixture of the waxes and the low softening point resin may be used. Further, by mixing 5 to 20% by weight of organic or inorganic powder that transmits infrared rays in the release layer, it becomes possible to reduce the elongation at break at the time of transfer by a thermal head.

Then, the above material can be dissolved or dispersed in a solvent to form a paint, which can be coated to form a release layer. As this solvent, aromatic hydrocarbons such as toluene and alcohol solvents such as methyl ethyl ketone and methyl isobutyl ketone can be used. As the coating means, known means such as gravure coating, roll coating, bar coating, air knife coating, blade coating and screen printing can be used. The thickness of the peeling layer is usually set to about 0.5 to 2.0 μm.

Next, the above-mentioned thermal transfer layer is a film which is peeled off directly from the base sheet or together with the peeling layer at the time of thermal transfer, and is transferred onto the infrared reflecting substrate directly or together with the adhesive layer described below. The main component is composed of the binder.

First, as the resin binder, a polymer material soluble in water or an organic solvent can be applied. Specifically, methacrylic acid such as polyvinyl alcohol, methyl cellulose, ethyl cellulose, cellulose acetate, nitrocellulose, polystyrene, polyvinyl chloride, polyamide, linear saturated polyester, polymethylmethacrylate, polyethylmethacrylate, or the ester thereof alone. Alternatively, a copolymer, polyurethane, polybutyral or the like can be used.

When a thermal transfer material that can be directly transferred to the infrared reflecting substrate without using the adhesive layer is formed,
It is desirable to apply a resin binder having a glass transition point of 50 to 110 ° C. The molecular weight of such a resin binder is usually 8,000 or more. Examples of the high molecular weight resin include polyester resins; polyvinyl chloride, vinyl chloride-vinyl acetate copolymer resins, vinyl chloride resins such as modified vinyl chloride-vinyl acetate copolymer resins, polyacrylic acid, polyacrylic acid-2. -Methoxyethyl, polymethyl acrylate, poly (2-naphthyl acrylate), poly (isobornyl acrylate), poly (methacrylonitrile), poly (acrylonitrile), poly (methyl chloroacrylate), poly (methyl methacrylate), poly (ethyl methacrylate), poly (methacrylic acid) -t -Butyl, poly (isobutyl methacrylate), poly (phenyl methacrylate), methyl methacrylate and alkyl methacrylate (provided that the number of carbon atoms in the alkyl group is 2 to
6) Acrylic resin such as copolymer; nylon-
6,6, nylon-6,7, nylon-6,8, nylon-6,9, nylon-6,10, nylon-6,1
2, polyamide-based resins such as nylon-10; polyacetal-based resins such as polyvinyl acetal, and the like can be used.
When the thermal transfer layer is directly transferred onto the infrared reflective substrate by a thermal head, the thermal response is improved by mixing the above-mentioned high molecular weight resin with a low softening point resin having a softening point of 50 to 150 ° C. The transfer around the heated portion is prevented, and the transfer accuracy can be improved. As such a low softening point resin, the low softening point resin applied to the release layer can be applied. The amount of this mixture may be 20 to 70% by weight of the whole resin component of the thermal transfer layer, and the remainder is a low-softening point resin. Further, in the same manner as described above, when the separate transfer layer is directly transferred onto the infrared reflective substrate by the thermal head, it is desirable to mix an abrasion resistant material with the thermal transfer layer. As the abrasion resistant material, natural wax such as animal wax, plant wax, mineral wax, petroleum wax; synthetic hydrocarbon wax, ester wax of aliphatic alcohol and acid, hydrogenated wax,
Synthetic ketone wax, amine or amide wax, chlorinated hydrocarbon wax, synthetic animal wax,
Synthetic waxes such as α-olefin waxes; metal salts of higher fatty acids such as zinc stearate; Teflon powders; polyethylene powders and polypropylene powders can be used. The mixing amount may be 6 to 70 parts by weight with respect to 100 parts by weight of the resin component.

On the other hand, as the infrared absorbing substance to be incorporated in the thermal transfer layer, a powdered pigment having a small absorption in the visible region can be applied. Specific examples of this pigment include a metal complex type infrared absorbing agent, and further, glass-based materials such as phosphate glass and sulfuric acid glass, which are required by crushing infrared absorbing glass or heat-warming absorbing glass to form a pigment, can be exemplified. The invention according to claim 3 applies the glass-based powder material containing Fe ²⁺ and / or Cu ²⁺ as the infrared absorbing substance.

That is, the invention according to claim 3 is claim 1
Alternatively, on the premise of the thermal transfer material according to item 2 or 3, the infrared absorbing material is characterized by being composed of a glass-based powder material containing Fe ²⁺ and / or Cu ²⁺ .

More specifically, this glass-based powder material is a powder material containing phosphorus pentoxide (P ₂ O ₅ ) as a main component and containing iron oxide and / or copper oxide in an amount of 1.0% by weight or more. Preferably, phosphorus pentaoxide is 35.0% by weight.
80.0%, 0 to 3.0% iron oxide and copper oxide respectively
It is characterized in that it is a glass-based powder material containing.

The glass-based powder material may contain the following compounds, if necessary. That is, Al ₂ O ₃ 2.0 to 10.0 wt% B ₂ O ₃ 1.0 to 30.0 wt% MgO 3.0 to 10.0 wt% ZnO 0 to 3.0 wt% K ₂ O 0 ~ 15.0% by weight BaO 0 to 10.0% by weight SrO 0 to 1.0% by weight Ni, Co, Se Trace amount Further, the powdered pigment has less absorption in the visible region and has an excellent infrared absorption ability. The following white crystalline powder materials such as phosphate-based white crystalline powder and sulfate-based white crystalline powder are also applicable as the infrared absorbing substance according to the present invention.
Incidentally, when such a material is applied, it has an advantage that the film thickness of the thermal transfer layer can be set thin because of its excellent infrared absorbing ability. The invention according to claim 4 is based on such a technical basis.

That is, the invention according to claim 4 is claim 1
Or, on the premise of the thermal transfer material according to 2, the infrared absorbing substance is composed of a phosphate white crystal powder material containing Fe ²⁺ and / or Cu ²⁺ and containing phosphorus pentoxide as a main component. It is characterized by.

In the invention according to claim 4, the phosphate white crystal powder constituting the infrared absorbing substance contains 20 wt% or more of Fe ²⁺ and / or Cu ^2+, and phosphorus pentoxide (P ₂
O ₅ ) as a crystalline powder, preferably 40 to 70% by weight of the above phosphorus pentoxide, Fe ²⁺ and / or C
A crystal powder containing 30 to 70% of u ²⁺ is desirable.
The phosphate-based white crystal powder is obtained by melting and crystallizing the phosphate-based composition having the above-mentioned composition to obtain a phosphate-based white crystal and powdering the same. is there. still. The phosphate-based white crystal powder may also contain the following compounds, if necessary. That is, Al ₂ O ₃ 2.0 to 10.0 wt% B ₂ O ₃ 1.0 to 30.0 wt% MgO 3.0 to 10.0 wt% ZnO 0 to 3.0 wt% K ₂ O 0 〜15.0 wt% BaO 0-10.0 wt% SrO 0-1.0 wt% Ni, Co, Se Trace amount Incidentally, the above-mentioned metal complex type infrared absorber, glass-based powder material, and white crystal system The powder material itself is white or lightly colored, and when applied to a white infrared reflective substrate, it becomes a similar color to this infrared reflective substrate, making it difficult to see. When applied to the infrared reflective substrate of the system, it is easier to see. Therefore, in such a case, it is necessary to mix a color pigment or a dye to adjust the color to the same color as the chromatic infrared reflective substrate. The invention according to claim 2 is based on such a reason.

Further, as the infrared absorbing substance blended in the thermal transfer layer, an infrared absorbing dye having a small absorption in the visible region can be applied.

That is, the invention according to claim 5 is claim 1
Or the infrared transfer material is a cyanine-based, phthalocyanine-based, naphthalocyanine-based, naphthoquinone-based, anthraquinone-based, aminium-based, dithiol metal complex salt-based, diimmonium-based, triphenylmethane-based, chronicmethine-based Infrared absorbing dyes such as azulenium, pyrilium and the like.

In the invention according to claim 2, there is also an advantage that the infrared absorbing dye can be applied to the color adjustment of the thermal transfer layer according to the color of the infrared reflecting substrate.

The invention according to claim 6 is the same as claim 1.
Alternatively, the above infrared absorbing material is premised on the thermal transfer material according to item 2.
Where, in the formula, n is a natural number of 1 or 2, and R is hydrogen or charcoal.
An alkyl group having a prime number of 1 to 12, X^-Is perchlorate (Cl
O_Four ^-), Fluoroborates (BF_Four ^-), Trichlor
Acetate (CCl₃COO^-), Trifluoroacetate (C
F₃COO^-), Hexafluoroantimonate (Sb
F₆ ^-), Benzene sulfonate (C₆H_FiveS
O₃ ^-), Ethane sulfonate (C₂H_FiveS
O₃ ^-), Phosphate (PO _Four ^-3) Either or these
A mixture of
It is something.

When this infrared-absorbing dye is applied, its infrared-absorbing ability is excellent and it exhibits a white or light coloring, so that even if a thin thermal transfer layer is set, sufficient infrared absorption is obtained in the infrared region. When it is applied to a white-colored or light-colored infrared-reflecting substrate, it can have the same color as the infrared-reflecting substrate.

The thermal transfer layer is formed by dissolving or dispersing the above-mentioned resin binder and infrared absorbing substance in a solvent to obtain an infrared absorbing ink and applying the infrared absorbing ink on the base sheet or on the release layer. You can In this case, as the solvent, for example, toluene, methyl isobutyl ketone, xylene, cyclohexanol, isobutyl acetate, cyclohexanone, methyl cyclohexanone, glycol derivatives such as ethylene glycol monobutyl ether, or a mixed solvent thereof can be applied. still,
The infrared absorbing substance is preferably contained in the infrared absorbing ink composition excluding the solvent in an amount of 80% by weight or less. If it exceeds 80% by weight, the transferred thermal transfer layer pattern becomes matte and infrared light is reflected on the surface thereof, and the cohesive force is also limited and the adhesiveness and scratching strength are deteriorated. is there. Further, it is desirable that the resin binder is contained in the infrared absorbing ink composition excluding the solvent in an amount of 20% by weight or more. The infrared absorbing ink may contain a defoaming agent, a lubricant and the like in addition to the above materials.
Further, as the coating means of the infrared absorbing ink, known coating methods such as bar coating, blade coating, air knife coating, gravure coating and roll coating screen printing can be applied, and the film thickness of the thermal transfer layer is usually 1 to 10
It is set to about μm.

When the adhesive force of the thermal transfer layer to the infrared reflecting substrate is not sufficient, the above-mentioned adhesive layer may be provided on the thermal transfer layer. Examples of the material applicable to this adhesive layer include the above-mentioned high molecular weight resin having a glass transition point of 50 to 110 ° C. and a mixture of this resin and the above-mentioned low softening point resin. It is set to about 2 μm.

Further, the thermal transfer material may be provided with a back coat layer on the back surface side of the base sheet for smoothing traveling with the thermal head during thermal transfer.

Then, by applying heat energy to the thermal transfer material according to the present invention by means of a thermal energy applying means such as a thermal head, any shape such as a bar code, a Nizigen code, letters or numbers can be formed on the infrared reflecting substrate. The infrared absorption pattern can be formed arbitrarily and easily.

In the thermal transfer material according to the first aspect, since the infrared absorbing substance forming the main part of the infrared absorbing pattern is made of a material of the same color as the infrared reflecting substrate, it is concealed with the process ink. It becomes difficult to see the pattern without forming a layer, and
Only reading with an infrared reading device is possible.

Further, in the heat transfer material according to claim 2, since the heat transfer layer constituting the main part of the infrared absorption pattern is adjusted to have the same color as the infrared reflective substrate, the concealing layer is formed by using the process ink. It becomes difficult to visually check the pattern without forming the above, and only the infrared reading device can read the pattern.

The infrared-reflecting substrate is capable of reflecting 80% or more of the irradiated infrared rays. For example, a polyethylene terephthalate material coated with titanium oxide or the like,
A white base material such as a polyvinyl chloride material or paper can be exemplified, and an infrared reflective base material of another color can also be applied.

Further, as an object to which this thermal transfer material is applied,
For example, stock certificates, bonds, checks, passbooks, lottery tickets, boarding rights,
In addition to securities such as coupons and commuter tickets, it can be suitably used for securities related products such as ID cards, credit cards, cash cards, plastic cards such as gift cards, and prepaid cards typified by telephone cards.

The infrared absorption pattern formed by the thermal transfer layer on the infrared reflective substrate has, for example, a wavelength of 750 nm, 780 nm, 810 nm by a semiconductor laser.
It is identified as a black pattern by laser light of 830 nm, 905 nm, or the like.

[0039]

According to the thermal transfer material of claims 1 and 3 to 6, an infrared absorbing pattern of an arbitrary shape can be easily formed on the infrared reflecting substrate by a heating means such as a thermal head, and the infrared reflecting substrate can be easily formed. Since the infrared transfer substance is contained in the thermal transfer layer transferred on the pattern above, it becomes possible to perform machine reading by the infrared reading device, and this infrared absorption substance is made of a material of the same color as the infrared reflective substrate. Since it is configured, it becomes possible to make it difficult to visually check the infrared absorption pattern without forming a hiding layer or the like using a process ink as in the conventional case.

On the other hand, according to the thermal transfer material of the second to sixth aspects, an infrared absorption pattern of any shape can be easily formed on the infrared reflective substrate by a heating means such as a thermal head, and the infrared transfer substrate can be formed on the infrared reflective substrate. Since the thermal transfer layer transferred on the pattern contains an infrared absorbing substance,
Machine reading by infrared reading device is possible,
Further, since the thermal transfer layer containing the infrared absorbing substance is adjusted to contain a coloring pigment or a dye so as to have a color similar to that of the infrared reflecting substrate, a concealing layer or the like is conventionally formed using a process ink. It becomes possible to make it difficult to visually check the infrared absorption pattern without forming the pattern.

[0041]

EXAMPLES Examples of the present invention will be described in detail below.

Example 1 First, a cupric-containing phosphate-based composition having the following composition was melted and crystallized to obtain a cupric-containing phosphate-based white crystalline compound.

(Copper-containing phosphate-based composition) P ₂ O ₅ 50.0% by weight CuO 49.5% by weight ZnO 0.5% by weight Incidentally, this compound was subjected to X-ray irradiation using a copper tube. When diffraction was performed, diffraction angle (2θ) = 28.14, 30.0
It was confirmed that strong peaks appeared at 7, 30.34, and 44.01, and crystallization was performed.

Next, the cupric-containing phosphate-based white crystals were pulverized into powder, and this was used as an infrared absorbing pigment to prepare an infrared absorbing ink having the following composition.

(Infrared absorbing ink) Pigment (cupric acid-containing phosphate-based white crystal compound) 40.0 parts by weight Styrene-acrylic polymer 10.0 parts by weight (glass transition point: 100 ° C., molecular weight: about 70,000) Epoxy Resin (glass transition point: 83 ° C., molecular weight: about 1000) Toluene Then, a thermal transfer material according to an example was obtained using this infrared absorbing ink.

That is, as shown in FIG. 1, the thermal transfer material 10 includes a base sheet 11 made of biaxially oriented polyethylene terephthalate having a thickness of 3.5 μm, and a release layer coating material having the following composition is gravure coated on the base sheet 11. The peeling layer 12 having a thickness of 1.5 μm and the thermal transfer layer 13 having a thickness of 1.5 μm formed by gravure coating the infrared absorbing ink on the peeling layer 12 form a main part. Has been done.

(Release Layer Coating Material) 10.0 parts by weight Epoxy resin (glass transition point: 98 ° C., molecular weight: about 1600) Methyl ethyl ketone 40.0 parts by weight Then, using the obtained thermal transfer material 10, a blue color is produced by a thermal head. The thermal transfer layer 13 is transferred in a pattern onto the paper 20 of the system, and the infrared series pattern 2 as shown in FIG.
1 was formed.

The blue paper 20 and the infrared absorption pattern 21 could not be visually discriminated from each other, and it was almost impossible to visually observe the pattern 21. It was possible to recognize the print pattern with an IR scope (infrared reading device manufactured by Ikegami Tsushinki Co., Ltd.).

Example 2 Next, Example 2 is the same as Example 1 except that the following infrared absorbing dye was used in place of the infrared absorbing pigment of the infrared absorbing ink of Example 1. (Infrared absorbing ink) Dye: N, N, N ', N'-tetrakis (P-di-n-butylaminophenyl) P phenylenediaminium perchlorate 5.0 parts by weight γ-butyrolactone 5.0 parts by weight Parts Polyester resin 30.0 parts by weight (Glass transition point: 67 ° C., molecular weight: about 2000) Methyl ethyl ketone 60.0 parts by weight Then, using the obtained thermal transfer material 10, a pattern is formed on the blue paper 20 by a thermal head. Infrared series pattern 2 as shown in FIG.
1 was formed.

It should be noted that the blue paper 20 and the infrared absorption pattern 21 were indistinguishable from the naked eye, and it was almost impossible to see the pattern 21. It was possible to recognize the print pattern with an IR scope (infrared reading device manufactured by Ikegami Tsushinki Co., Ltd.).

[Example 3] Further, Example 3 is the same as Example 1 except that the following infrared absorbing dye was used in place of the infrared absorbing pigment of the infrared absorbing ink of Example 1. (Infrared absorbing ink) Dye: N, N, N ', N'-tetrakis (P-di-n-butylaminophenyl) P Phenylenediaminium fluorinated antimonate 5.0 parts by weight γ-butyrolactone 5.0 Parts by weight Polyester resin 30.0 parts by weight (glass transition point: 67 ° C., molecular weight: about 2000) Methyl ethyl ketone 60.0 parts by weight Then, using the obtained thermal transfer material 10, a thermal head is used to transfer onto blue paper 20. The infrared transfer pattern 2 as shown in FIG. 2 is obtained by transferring the thermal transfer layer 13 in a pattern.
1 was formed.

It should be noted that the blue paper 20 and the infrared absorption pattern 21 could not be visually distinguished from each other, and the pattern 21 could hardly be visually recognized. It was possible to recognize the print pattern with an IR scope (infrared reading device manufactured by Ikegami Tsushinki Co., Ltd.).

[0053]

According to the thermal transfer material of claims 1 and 3 to 6, it is possible to easily form an infrared absorption pattern of an arbitrary shape on the infrared reflective substrate by a heating means such as a thermal head and to reflect infrared rays. Since the infrared transfer substance is contained in the thermal transfer layer transferred onto the pattern on the conductive substrate, it can be mechanically read by an infrared reading device, and the infrared absorption substance has the same color as the infrared reflective substrate. Since it is made of a material, it becomes possible to make it difficult to visually check the infrared absorption pattern without forming a hiding layer or the like using a process ink as in the conventional case.

On the other hand, according to the thermal transfer material of the second to sixth aspects, an infrared absorption pattern of an arbitrary shape can be easily formed on the infrared reflective substrate by a heating means such as a thermal head, and the infrared transfer substrate can be formed on the infrared reflective substrate. Since the thermal transfer layer transferred on the pattern contains an infrared absorbing substance,
Machine reading by infrared reading device is possible,
Further, since the thermal transfer layer containing the infrared absorbing substance is adjusted to contain a coloring pigment or a dye so as to have a color similar to that of the infrared reflecting substrate, a concealing layer or the like is conventionally formed using a process ink. It becomes possible to make it difficult to visually check the infrared absorption pattern without forming the pattern.

Therefore, there is an effect that a bar code printed matter or a secret information printed matter which can be mechanically read by infrared light but which is difficult to see without providing a concealing portion or the like in the prior art can be easily provided.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a thermal transfer material according to an example.

FIG. 2 is a cross-sectional view of a paper on which an infrared absorption pattern is formed by a thermal transfer material according to an example.

FIG. 3 is an explanatory view showing a state at the time of manufacturing the magnetic recording body of the present invention.

[Explanation of symbols]

 10 Thermal Transfer Material 11 Base Sheet 12 Release Layer 13 Thermal Transfer Layer

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Nagahisa Matsudaira 1-5-1, Taito, Taito-ku, Tokyo Toppan Printing Co., Ltd.

Claims (6)

[Claims] 1. A thermal transfer material for thermally transferring a thermal transfer layer provided on a base sheet to form an infrared absorption pattern on an infrared reflective substrate, wherein the infrared transfer substance of the same color type as the infrared reflective substrate is present in the thermal transfer layer. A thermal transfer material characterized by containing. 2. A thermal transfer material for thermally transferring a thermal transfer layer provided on a base sheet to form an infrared absorption pattern on an infrared reflective substrate, wherein the thermal transfer layer has the same color system as the infrared reflective substrate. A thermal transfer material comprising a layer containing a color pigment or a dye together with an infrared absorbing substance. 3. The thermal transfer material according to claim 1, wherein the infrared absorbing substance is composed of a glass-based powder material containing Fe ²⁺ and / or Cu ²⁺ . 4. The infrared absorbing material is composed of a phosphate-based white crystalline powder material containing Fe ²⁺ and / or Cu ²⁺ and containing phosphorus pentoxide as a main component. The thermal transfer material according to 1 or 2. 5. The infrared absorbing material is cyanine-based, phthalocyanine-based, naphthalocyanine-based, naphthoquinone-based,
An infrared absorbing dye such as an anthraquinone type, an aminium type, a dithiol metal complex salt type, a diimmonium type, a triphenylmethane type, a chronic methine type, an azureniium type, a pyrylium type, or the like.
The thermal transfer material described. 6. The infrared absorbing material is[Wherein n is a natural number of 1 or 2 and R is hydrogen or charcoal]
An alkyl group having a prime number of 1 to 12, X^-Is perchlorate (Cl
O_Four ^-), Fluoroborates (BF_Four ^-), Trichlor
Acetate (CCl₃COO^-), Trifluoroacetate (C
F₃COO^-), Hexafluoroantimonate (Sb
F₆ ^-), Benzene sulfonate (C₆H_FiveS
O₃ ^-), Ethane sulfonate (C₂H_FiveS
O₃ ^-), Phosphate (PO _Four ^-3) Either or these
A mixture of the above].
Is the thermal transfer material described in 2.