JPH0648034A - Reversible, thermosensible recording label and card - Google Patents

Abstract

PURPOSE:To provide a reversible, thermosensible label forming an image with high contrast by installing a reversible, thermosensible recording layer on one side of a support and laminating an adhesive layer or a pressure sensitive adhesive layer and a released paper sheet in sequence on the other side of the support. CONSTITUTION:On the rear of a reversible, thermosensible recording material 2 prepared by coating the surface of a support 3 with a reversible, thermosensitive recording layer 1, a released paper sheet 5 is stuck through an adhesive layer or a pressure sensitive adhesive layer 4 to form a label sheet. A reversible, thermosensitive card is also prepared by removing the released paper sheet 5 of this label sheet and laminating another sheet on the adhesive layer or the pressure sensitive layer 4. The reversible, thermosensible recording layer 1 in the form of a film or a sheet can be prepared by a method in which a solution of a resin base material and an organic compound with a low molecular weight dissolved in a solvent is applied on the support 3 such as a plastic film and the solvent is evaporated. The adhesive and the pressure sensitive adhesive include adhesives of urea resin and melamine resin and of these resins added with a tackifier.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention uses a reversible thermosensitive recording label capable of repeatedly forming and erasing an image by utilizing the reversible change in transparency depending on the temperature of a thermosensitive layer, and a label using the reversible thermosensitive recording label. Regarding the card that was there.

[0002]

2. Description of the Related Art In recent years, reversible heat-sensitive recording materials have been attracting attention because they can form images temporarily and can erase the images when they are no longer needed. As a typical example, the glass transition temperature (Tg) is from 50 to 60 ° C. to 8
A reversible thermosensitive recording material is known in which an organic low molecular weight substance such as a higher fatty acid is dispersed in a resin matrix such as a vinyl chloride-vinyl acetate copolymer having a low glass transition temperature of less than 0 ° C. JP-A-54-119377, JP-A-55-1
54198 and the like).

A method of displaying information on a card by providing a colored portion on the back surface of this recording material (Actual Kaihei 2-387).
6) and a method for displaying information by providing a light reflecting layer on the back surface of the recording material to improve the contrast (Japanese Patent Laid-Open Publication No. 6-58242).
4-14079), a method of providing a thin film layer having a different refractive index on the back surface of this recording material (JP-A-2-175280) and the like, further, for the purpose of protecting the recording layer from this heat history, a silicone rubber, Silicone resin (JP-A-63-221
No. 087), a polysiloxane graft polymer (described in JP-A-63-317385), an ultraviolet curable resin or an electron beam curable resin (described in JP-A-2-566).
There is also proposed a method of providing the. However, these reversible heat-sensitive recording materials have a drawback that they are deteriorated by heat and pressure of the thermal head etc. when recording and erasing of an image are repeated many times by using a heating means such as a thermal head.

In recent years, there has been an increasing demand for displaying information on a PVC thick card such as an IC card, an ID card and a cash card. However, evenly coating the reversible heat-sensitive recording material on this PVC-based thick card means that the PVC-based material will be dissolved by the solvent, and that uniform mechanical coating is impossible due to the thick hard sheet. , Etc. are extremely difficult. Some thick cards are provided with a recess, and labeling is considered as a method of displaying information on these cards.

One of the proposals in the field of using such a thick card is a recording material in which a display portion is embedded in a concave portion of the thick card (Japanese Utility Model Laid-Open No. 58-192066). However, with this structure as it is, there is a step between the embedding part and the card surface, and when printing and erasing are repeated using a heating means such as a thermal head, the card deforms due to heat, and print failures and erasing defects occur. However, there is a drawback that repeated printing becomes impossible. Also, thick cards will run out of print unless the thermal head pressure is increased, so
It is necessary to increase the pressure of the thermal head, and as a side effect thereof, there are drawbacks such that scratches are likely to occur and label peeling is likely to occur.

Further, such a reversible thermosensitive recording material is
When a printing layer is provided on the surface, the initial printability is good, but if recording and erasing of the image are repeated a number of times using a heating means such as a thermal head, heat and pressure of the thermal head, as well as the conveyance section There was a drawback that the printing layer was scraped off by the roller. Particularly in the case of a thick card, the pressure of the thermal head is relatively large and a strong force is applied at the transporting portion as described above, so that the print layer is strongly scraped and the label easily peels off at the transporting portion.

[0007]

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to solve the above-mentioned drawbacks and to provide a reversible recording display property even on a non-coatable medium by labeling, and to heat a thermal head or the like. Even if the image is repeatedly formed and erased by a low pressure thermal head pressure, a high-contrast image can be formed and the durability is excellent, the printed layer is not scraped, and scratches are not generated repeatedly. It is an object of the present invention to provide a reversible thermosensitive recording label in which the label is not peeled off in the transport section, and further, the print is not cut off even when the card is deformed, and a card using the label.

[0008]

That is, according to the present invention,
An adhesive layer or an adhesive layer is provided on the surface of a reversible thermosensitive recording member whose transparency is reversibly changed by heat, and a reversible thermosensitive recording label is provided which further comprises a release paper. Further, there is provided a reversible thermosensitive recording label, which further comprises a printing layer between the reversible thermosensitive recording member and the adhesive layer or the adhesive layer, and further, the adhesive layer or the adhesive layer. There is provided a reversible thermosensitive recording card, which is obtained by adhering an adherend on the above.

In conventional labels such as thermal labels and ribbon labels, silicone paper is used as the release paper, pressure-sensitive adhesive is used as the adhesive, and acrylic emulsion is used as a typical material. ing. This label sheet has sufficient adhesive strength because it is not a repeatable specification, but when this adhesive is used for repeatable specifications, the adhesive strength is weak and there is a risk that peeling will occur in the transport section after repeated use. Is high.
Furthermore, when changing to an adhesive that can withstand repeated specifications, the problem of peeling failure in the transport section after repeated use can be prevented, but if the adherend is thick and deformed, there are defects such as print out. Therefore, the thermal head pressure is increased to prevent the print from being cut off. However, on the other hand, there is a defect that defective scratches occur after repeated use. Further, in a conventional label or card, as a means for preventing the surface from being printed and scraped, there is a lamination process, an OP varnish process, or the like. An image formed by using a heating means such as a thermal head is applied to the processed product. In that case, high energy conditions are required, and when image formation and erasing are repeated a number of times under high energy conditions, there is a drawback in that the durability against repetition is poor. However, since the reversible thermosensitive recording label and the card of the present invention are configured as described above, a high-contrast image can be formed even if the image forming and erasing are repeated many times by using a heating means such as a thermal head. In addition, the durability against repeated use is excellent, the printed layer is not scraped, and the peeling and the scratch defect in the transport section after the repeated use are not caused.

The specific structure of the present invention will be described in detail below. 2 to 16 show constitutional examples of the reversible thermosensitive recording label of the present invention. In FIG. 2, the back surface of the reversible thermosensitive recording member 2 obtained by coating the surface of the support 3 with the reversible thermosensitive recording layer 1 is adhesively processed to the release paper 5 via the adhesive layer or the adhesive layer 4. It is a structure of a label sheet. The reversible thermosensitive card of the present invention has a structure in which an adherend is attached to the adhesive layer or the pressure-sensitive adhesive layer 4 except for the release paper 5 of the label sheet having the above structure. FIG. 3 shows the structure of a label sheet in which a print layer 14 is provided on the back surface of the reversible thermosensitive recording member 2, and a release paper 5 is adhesively processed on the back surface of the reversible thermosensitive recording member 2 via an adhesive layer or an adhesive layer 4. FIG. 4 shows a sheet obtained by adhering the back surface of the reversible thermosensitive recording member 2 to a paper or film 7 via an adhesive layer or a pressure-sensitive adhesive layer 6 and a release paper 5 via the adhesive layer or the pressure-sensitive adhesive layer 4.
FIG. 5 shows the structure of a label sheet that is adhesively processed to
Is a sheet having a printing layer 14 provided on the back surface of the reversible thermosensitive recording member 2, and a paper or film 7 adhered to the back surface of the printing layer 14 via an adhesive layer or an adhesive layer 6 to form an adhesive layer or an adhesive layer 4. It is a configuration of a label sheet that is adhesively processed to the release paper 5 via the. In addition, in FIGS. 6 to 8, in order to further improve the image contrast in the configuration of FIGS. 2, 4 or 5, an adhesive layer or an adhesive layer is included in a part of the adhesive layer or the adhesive layer 4, 6 or 14 and 6. It is a configuration in which the non-contact portion 8 having air therein is interposed.

In FIGS. 9 to 12, in order to further improve the image contrast, a reflection film layer (light reflection layer) is formed below the non-adhesive portion 8.
Alternatively, the colored layer 9 is provided. In each case, the contrast of the image is improved by utilizing the reflection of light at the interface between the air layer and the reflection film layer or the coloring layer and the film in the non-adhesive portion. 13 and 16 show the back surface of the reversible thermosensitive recording member 2 provided with the reflective film layer or the coloring layer 9 on the front surface or the back surface of the support 3 on the release paper 5 via the adhesive layer or the pressure-sensitive adhesive layer 4. Adhesive processed structure is effective for improving image contrast. Further, as shown in FIGS. 14 to 15, the magnetic recording layer 10 was provided on any part (front surface or back surface) of the support 3, and the reversible thermosensitive recording layer 1 was provided on the reflective film layer or the coloring layer 9. With the configuration, it can be applied to a magnetic card or the like.

Next, FIGS. 17 to 20 show constitution examples of the reversible thermosensitive recording card of the present invention. In addition, FIG. 21 shows a configuration example of a conventional reversible thermosensitive recording card. FIG. 17 shows the adherend 1
1 has a recessed part, and the reversible thermosensitive recording label 12 of the present invention is attached to the recessed part. FIG. 18 shows a structure in which a part of the adherend 11 is recessed, the recess is colored by the coloring layer 9, and the reversible thermosensitive recording label 12 of the present invention is adhered to the recess. FIG. 19 shows a structure in which the reversible thermosensitive recording label 12 of the present invention is attached to a part of the surface of the adherend 11. Further, FIG. 20 shows a structure in which a part of the surface of the adherend is colored by the coloring layer 9 and the reversible thermosensitive recording label 12 is stuck on the surface.

The reversible thermosensitive recording member of the present invention generally has a reversible thermosensitive recording layer on a support, but is not limited thereto. However, here, for convenience of description, the description will focus on the case where the heat-sensitive recording layer is provided on the support.

As the support of the reversible thermosensitive recording member of the present invention, polyethylene film, polypropylene film, polyvinyl chloride film, polyvinylidene chloride film, polyvinyl alcohol film, polyethylene terephthalate film, polycarbonate film, nylon film, polystyrene film, Ethylene vinyl acetate copolymer film, ethylene vinyl alcohol copolymer film, polyethylene naphthalate film,
Plastic films such as fluorinated ethylene propylene film, aromatic polyamide film, polyarylate film, polyether sulfone film, polyetherimide film, polyimide film, acrylic resin film and ionomer film are used. The thickness of the support is preferably about 20 to 250 μm,
More preferably, it is 50 to 188 μm.

Further, as the reversible thermosensitive recording label and the card of the present invention, there is one in which a printing layer is further provided between the thermosensitive recording member and the adhesive layer or the adhesive material layer. As the material, it is preferable to use ultraviolet curable ink. Further, in order to obtain clear full-color printing, it is preferable to provide a white hiding layer on the lower surface. The thickness of the printed layer is preferably 2 to 10 μm.

In the reversible thermosensitive recording member, the release paper is subjected to the adhesive processing on the support side via the adhesive layer or the pressure-sensitive adhesive layer, or the paper or film on the support side via the adhesive layer or the pressure-sensitive adhesive layer. Is laminated, and the release paper is adhesively processed on this paper or film through an adhesive layer or a pressure-sensitive adhesive layer.
In any case, a conventionally known adhesive or pressure-sensitive adhesive can be used as the adhesive or pressure-sensitive adhesive forming the adhesive layer or the pressure-sensitive adhesive layer. In particular, it is preferable to use an adhesive or pressure-sensitive adhesive that does not adversely affect the reversible thermosensitive recording member and has a cushioning function.

Specific examples of the adhesive and the adhesive include urea resin, melamine resin, phenol resin, epoxy resin, vinyl acetate resin, vinyl acetate acrylic copolymer resin, EVA resin, acrylic resin, polyvinyl resin. Ether type resin, vinyl chloride vinyl acetate type copolymer resin, polystyrene type resin, polyester type resin, polyurethane type resin, polyamide type resin, chlorinated polyolefin type resin, polyvinyl butyral resin, acrylic acid ester type copolymer, methacrylic acid Examples thereof include adhesives such as ester-based copolymers, natural rubber-based and cyanoacrylate-based copolymers, and adhesives obtained by adding a suitable tackifier to these adhesives. Further, if necessary, a plasticizer, a filler, an antiaging agent and the like can be added.

Of the above-mentioned adhesives, an elastic adhesive containing a synthetic rubber or a siloxane cross-linked polymer as a main component is particularly preferable because it has a cushioning function and has a large ability to relieve stress. The elastic adhesive containing a siloxane cross-linked polymer as a main component, for example, contains an amino group capable of reacting with an epoxy group, the main chain structure is polyoxypropylene, a liquid polymer having a moisture-curable silyl group, A composition containing an epoxy resin as a main component can be mentioned.
As the elastic adhesive having a cushion function, an acrylic foam adhesive can be used.

If necessary, water or an organic solvent may be added to such an adhesive or pressure-sensitive adhesive to adjust the viscosity, and the composition may be coated on a support or paper or film by a conventional method to form an adhesive layer or a pressure-sensitive adhesive. The agent layer is formed. The thickness of the adhesive layer or the pressure-sensitive adhesive layer is preferably about 1 to 40 μm.

When a paper or film is laminated on the back surface of the support through an adhesive layer or a pressure-sensitive adhesive layer, the paper is plain paper,
Coated paper or the like is used, and as the film, a plastic film similar to the above support is used. The material of the film used may be the same as or different from the material of the support. The thickness of paper and film is preferably about 4 to 350 μm.

In the present invention, the reflective film layer provided for improving the image contrast is preferably made of a metal vapor deposition film, for example, made of Al, Zn or the like. The colored layer preferably has a dark color, for example, black. In the present invention, the colored layer may be provided in the concave portion of the adherend.

In the present invention, the reversible thermosensitive recording label is adhesively processed on the support side to the release paper via the adhesive layer or the pressure-sensitive adhesive layer, and the commercially available silicone paper is preferable as the release paper to be used.

Further, the heat-sensitive recording layer of the reversible heat-sensitive recording label of the present invention is repeatedly sandwiched between the thermal head and the platen when forming and erasing an image with a thermal head or the like, and by a guide roll of the conveying section. Be transported. Therefore, if the adhesive force when the label sheet is attached to the adherend is insufficient, the label sheet may peel off during repeated image formation and erasure. Therefore, in the present invention, the adhesive strength between the label sheet and the adherend,
When expressed by the average value of the tensile load measured by the method of JIS K-6854, 180 degree peeling, 0.5 kgf / 2
It is preferably 5 mm or more. In the case of a structure in which the support side of the reversible thermosensitive recording label is attached to paper or film, the adhesive force between the support and the paper or film is preferably 0.5 kgf / 25 mm or more. That is, as the adhesive layer or the pressure-sensitive adhesive layer, the adhesive strength when adhered to the adherend is JIS K-6854, 18
It can be said that it is preferable to select one having a tensile load of 0.5 kgf / 25 mm or more when expressed by the average value of the tensile load measured by the 0 degree peeling method.

The label sheet of the present invention is bonded to an adherend to form a reversible thermosensitive recording card of the present invention. The adherend may be, for example, a vinyl chloride card such as a credit card, an IC card, an ID card. , Paper, film, synthetic paper,
Examples include, but are not limited to, boarding passes and commuter passes.

Next, the materials used for the reversible thermosensitive layer in the present invention will be described. Any material may be used as the material for the reversible heat-sensitive layer as long as the transparency changes with heat, but a material in which the transparent state and the cloudy state reversibly change is preferably used.

The reversible thermosensitive recording member of the present invention utilizes change in transparency (transparent state, cloudy opaque state), and the difference between this transparent state and cloudy opaque state is presumed as follows. That is, (i) in the case of being transparent, the particles of the organic low-molecular substance dispersed in the resin base material are composed of large particles of the organic low-molecular substance, and the light incident from one side is not scattered and is opposite. It looks transparent because it penetrates to the side,
(Ii) In the case of white turbidity, the particles of the organic low-molecular substance are composed of polycrystals of fine crystals of the organic low-molecular substance, and the crystal axes of the individual crystals are oriented in various directions so that they enter from one side. The generated light is refracted many times at the interface of the crystals of the organic low-molecular substance particles, and is scattered and thus appears white.

In FIG. 1 (representing the change in transparency due to heat), a heat-sensitive layer mainly composed of a resin base material and an organic low molecular weight substance dispersed in the resin base material is, for example, T
It is cloudy and opaque at room temperature below ₀ . This is the temperature T ₂
When it is heated to ₀ , it becomes transparent, and even if it is returned to room temperature below T _{0 in} this state, it remains transparent. This is the temperature T ₂ to T ₀
It is considered that the organic low molecular weight substance is in a semi-molten state until the following and the crystal grows from a polycrystal to a single crystal.
Upon further heating to T ₃ or more temperature becomes translucent state intermediate between the maximum transparency and the maximum opacity. Next, when this temperature is lowered, the first cloudy opaque state is restored without taking the transparent state again. It is considered that this is because when the organic low molecular weight substance is melted at a temperature of T ₃ or higher, the polycrystal is deposited by being cooled. When this opaque state is heated to a temperature between T _{1 and} T ₂ and then cooled to room temperature, that is, a temperature of T ₀ or lower, an intermediate state between transparent and opaque can be obtained. Also, the transparent material that has become transparent at room temperature returns to the cloudy and opaque state again when heated to a temperature of T ₃ or higher and then returned to room temperature. That is, both opaque and transparent forms at room temperature and intermediate forms thereof can be obtained.

Therefore, the heat-sensitive layer can be selectively heated by selectively applying heat to form a cloudy image on a transparent background and a transparent image on a cloudy background, and the change can be repeated many times. It is possible. By arranging a coloring sheet on the back surface of such a heat-sensitive body, it is possible to form an image of the color of the coloring sheet on a white background or a white image on the background of the color of the coloring sheet. Further, when projected by an OHP (overhead projector) or the like, the cloudy portion becomes a dark portion, the transparent portion transmits light and becomes a bright portion on the screen.

In order to form and erase an image using such a reversible thermosensitive recording material, it is necessary to have two thermal heads for image formation and image erasure, or to change the applied energy conditions. Therefore, it is effective to use a thermal head having a single thermal head for image formation and image deletion.

In the former case, the cost of the apparatus is increased because two thermal heads are required. However, if the reversible heat-sensitive recording material is passed once with different energy application conditions for each thermal head, image formation and This can be done by erasing. In the latter case, since the image is formed and erased by one thermal head, the conditions for applying energy to the thermal head at one time when the thermal recording material passes should be adjusted according to the image forming portion and the erasing portion. The operation is complicated, but the operation is complicated, such as changing the setting finely, or erasing the image on the thermal recording material once and then running the thermal recording material again in the opposite direction to form an image under different energy conditions. Therefore, the equipment cost is reduced.

To form the reversible heat-sensitive layer, the heat-sensitive layer may be formed as a film on the support or formed into a sheet by the following method, for example. 1) A method in which a resin base material and an organic low molecular weight substance are dissolved in a solvent, which is applied onto a support member, and the solvent is evaporated to form a film or sheet. 2) The resin base material is dissolved in a solvent that dissolves only the resin base material, and the organic low molecular weight substance is pulverized or dispersed therein by various methods, and this is applied onto a support member, and the solvent is evaporated to form a film. Or the method of making a sheet.

The solvent for preparing the heat-sensitive layer or heat-sensitive recording material can be variously selected depending on the kind of the resin base material and the organic low molecular weight substance, and examples thereof include tetrahydrofuran, methyl ethyl ketone, methyl isobutyl ketone, chloroform, carbon tetrachloride, ethanol, toluene, Examples thereof include benzene. Of course, when using the dispersion,
Even when a solution is used, the organic low molecular weight substance is precipitated as fine particles and exists in a dispersed state in the obtained heat-sensitive layer.

The resin used for the resin base material of the heat-sensitive layer is preferably a resin which can form a film or a sheet, has good transparency, and is mechanically stable. Such resins include polyvinyl chloride; vinyl chloride / vinyl acetate copolymers, vinyl chloride / vinyl acetate / vinyl alcohol copolymers, vinyl chloride / vinyl acetate / maleic acid copolymers, vinyl chloride / acrylate copolymers. Vinyl chloride-based copolymers such as coalesced materials; polyvinylidene chloride, vinylidene chloride / vinyl chloride copolymers, vinylidene chloride-copolymers such as vinylidene chloride / acrylonitrile copolymers; polyesters; polyamides;
Examples thereof include polyacrylate or polymethacrylate or acrylate / methacrylate copolymer; silicone resin and the like. These may be used alone or in admixture of two or more.

On the other hand, the organic low molecular weight substance may be any substance that changes from polycrystal to single crystal due to heat in the recording layer (changes within the temperature range of T _{1 to} T ₃ shown in FIG. 1).
Generally, those having a melting point of 30 to 200 ° C., preferably about 50 to 150 ° C. are used. Such organic low molecular weight substances include alkanols; alkane diols; halogen alkanols or halogen alkane diols; alkylamines; alkanes; alkenes; alkynes; halogen alkanes; halogen alkenes; halogen alkynes; cycloalkanes; cycloalkenes; cycloalkynes; saturated or Unsaturated mono- or dicarboxylic acids or their esters, amides or ammonium salts; saturated or unsaturated halogen fatty acids or their esters, amides or ammonium salts; allylcarboxylic acids or their esters, amides or ammonium salts; halogenallylcarboxylic acids or Esters, amides or ammonium salts thereof; thioalcohols; thiocarboxylic acids or esters, amines or ammonium salts thereof; carboxylic acid esters of thioalcohols Etc. The. These may be used alone or in admixture of two or more. The carbon number of these compounds is preferably 10 to 60, preferably 10 to 38, and particularly preferably 10 to 30. The alcohol group moiety in the ester may be saturated or unsaturated, and may be halogen-substituted. In any case, the organic low molecular weight substance is at least one kind of oxygen, nitrogen, sulfur and halogen in the molecule, for example, -OH, -CO.
OH, -CONH, -COOR, -NH, -NH 2, -
A compound containing S-, -SS-, -O-, halogen or the like is preferable.

More specifically, as these compounds,
Uric acid, dodecanoic acid, myristic acid, pentadecane
Acid, palmitic acid, stearic acid, behenic acid, nonadeca
Acid, araginic acid, henicosanoic acid, tricosanoic acid,
Gnoceric acid, pentacosanoic acid, cerotic acid, heptaco
Higher grades such as sanic acid, montanic acid, melissic acid, oleic acid
Fatty acid; methyl stearate, tetradecyl stearate
, Octadecyl stearate, octadecyl laurate
Such as tetradecyl palmitate and dodecyl behenate
Esters of higher fatty acids; C₁₆H₃₃-OC₁₆H₃₃ , C₁₆H₃₃-SC₁₆H₃₃
 , C₁₈H₃₇-SC₁₈H₃₇ , C₁₂H_{twenty five}-SC₁₂H_{twenty five}
 , C₁₉H₃₉-SC₁₉H₃₉ , C₁₂H_{twenty five}-S-S-C₁₂
H_{twenty five} ， Etc., such as ether or thioether. Above all, the present invention
Higher fatty acids, especially palmitic acid, pentadecanoic acid,
Nonadecanoic acid, arachidic acid, henicosanoic acid, Tricosa
Charcoal of acid, lignoceric acid, stearic acid, behenic acid, etc.
A higher fatty acid having a prime number of 16 or more is preferable, and a carbon number of 16 to 2
Higher fatty acids of 4 are more preferred.

It is also possible to use one of the above-mentioned organic low molecular weight substances as the organic low molecular weight substance and another type of organic low molecular weight substance as the substance for controlling the crystal growth. For example, stearic acid is used as an organic low molecular weight substance, and stearyl alcohol is used as a substance for controlling crystal growth. The weight ratio of the organic low molecular weight substance to the substance that controls the crystal growth of the organic low molecular weight substance is preferably about 1: 0.1 to 1: 0.8. If the substance that controls the crystal growth of the organic low molecular weight substance is less than this range, the temperature range or energy range where it becomes transparent cannot be widened, and if it exceeds this range, the opacity decreases.

The weight ratio of the organic low molecular weight substance to the resin base material in the heat sensitive layer is preferably about 2: 1 to 1:16, more preferably 1: 2 to 1: 8. If the ratio of the resin base material is below this range, it will be difficult to form a film in which the organic low molecular weight material is retained in the resin base material. Becomes difficult.

The thickness of the heat sensitive layer is preferably 1 to 30 μm,
2 to 20 μm is more preferable. If the heat-sensitive layer is too thick, heat distribution will occur in the layer and it will be difficult to achieve uniform transparency. On the other hand, if the heat-sensitive layer is too thin, the white turbidity is lowered and the contrast is lowered. Further, the white turbidity can be increased by increasing the amount of the organic low molecular weight substance in the heat sensitive layer.

In addition to the above components, additives such as a surfactant and a high boiling point solvent may be added to the heat sensitive layer in order to facilitate the formation of a transparent image. Specific examples of these additives are as follows. Examples of high boiling point solvents: tributyl phosphate, tri-2-phosphate
Ethylhexyl, triphenyl phosphate, tricresyl phosphate, butyl oleate, dimethyl phthalate, diethyl phthalate, dibutyl phthalate, diheptyl phthalate, di-n-octyl phthalate, di-2-ethylhexyl phthalate, diisononyl phthalate , Dioctyldecyl phthalate, diisodecyl phthalate, butylbenzyl phthalate,
Dibutyl adipate, di-n-hexyl adipate, di-2-ethylhexyl adipate, di-2 azelaate
-Ethylhexyl, dibutyl sebacate, di-2-ethylhexyl sebacate, diethylene glycol dibenzoate, triethylene glycol di-2-ethyl butyrate, methyl acetylricinoleate, butyl acetylricinoleate, butylphthalylbutyl glycolate, acetylcitric acid Tributyl.

Examples of surfactants and other additives: polyhydric alcohol higher fatty acid ester; polyhydric alcohol higher alkyl ether; polyhydric alcohol higher fatty acid ester, higher alcohol, higher alkylphenol, higher fatty acid higher alkylamine, higher fatty acid amide , Lower olefin oxide adducts of fats and oils or polypropylene glycol; acetylene glycol; Na, Ca, Ba or Mg salt of higher alkylbenzene sulfonic acid; higher fatty acid, aromatic carboxylic acid, higher fatty acid sulfonic acid, aromatic sulfonic acid, sulfuric acid monoester Or Ca, Ba or Mg salts of phosphoric acid mono- or di-esters; low-sulfated oils; poly long-chain alkyl acrylates; acrylic orgomers;
Poly long-chain alkyl methacrylate; long-chain alkyl methacrylate / amine-containing monomer copolymer; styrene / maleic anhydride copolymer; olefin / maleic anhydride copolymer.

On the heat-sensitive layer, a conventional reversible heat-sensitive recording material is used in order to prevent the transparency of the transparent portion from being lowered due to the deformation of the surface due to the heat and pressure of the heating means by the writing method such as a thermal head. Similarly, a protective layer can be provided. The thickness of the protective layer is 1 to 15 μm, preferably about 2 to 10 μm. If the thickness of the protective layer is less than 1 μm, the heat-sensitive layer cannot be used as a protective layer,
If it exceeds m, the thermal sensitivity of the heat-sensitive layer is lowered. Examples of the material of the protective layer laminated on the heat-sensitive layer include silicone rubber, silicone resin, polysiloxane graft polymer, ultraviolet curable resin, electron beam curable resin and the like.

In any case, a solvent is used at the time of coating, but it is desirable that the solvent is difficult to dissolve the resin of the heat sensitive layer and the organic low molecular weight substance. N-Hexane is used as a solvent in which the resin of the heat sensitive layer and the organic low molecular weight substance are difficult to dissolve
Methyl alcohol, ethyl alcohol, isopropyl alcohol and the like can be mentioned, and an alcohol solvent is particularly preferable from the viewpoint of cost.

Further, an intermediate layer may be provided between the protective layer and the reversible recording material in order to protect the reversible recording material from the solvent and the monomer component of the protective layer forming liquid (JP-A-1-133781). No. publication). As the material for the intermediate layer, the following thermosetting resins and thermoreversible resins can be used in addition to those listed as the resin base material in the thermosensitive layer.
That is, specifically, polyethylene, polypropylene, polystyrene, polyvinyl alcohol, polyvinyl butyral, polyurethane, saturated polyester, unsaturated polyester, epoxy resin, phenol resin, polycarbonate, polyamide and the like can be mentioned. The thickness of the intermediate layer varies depending on the use, but is preferably about 0.1 to 2 μm. If it is less than this, the protective effect is lowered, and if it is more than this, the thermal sensitivity is lowered.

[0044]

EXAMPLES The present invention will be described in more detail below with reference to examples. The parts and% shown below are based on weight.

Example 1 A solution having the following composition was applied on a PET film having a thickness of 50 μm and dried by heating to form a heat sensitive layer having a thickness of about 15 μm. Stearic acid 6 parts Eicosane diacid 4 parts Diisodecyl phthalate 2 parts Vinyl chloride / vinyl acetate / phosphorus ester copolymer 20 parts (Denka Vizier # 1000P manufactured by Denki Kagaku Kogyo KK) THF 150 parts Toluene 15 parts

Next, a solution consisting of 5 parts of polyamide resin (CM8000 manufactured by Toray Industries, Inc., CM8000) and 90 parts of methyl alcohol was applied on the heat-sensitive layer with a wire bar and dried by heating to form an intermediate layer having a thickness of about 0.3 μm. Further, a butyl acetate solution of urethane acrylate UV curable resin (Unidick Ci-157 manufactured by Dainippon Ink and Chemicals Co., Ltd.) is further applied thereto by a wire bar, and after heating and drying, UV rays are applied for 3 seconds by an 80 W / cm UV lamp. Irradiation provided an overcoat layer having a thickness of about 3 μm to prepare a reversible thermosensitive recording member.

Next, a nitrile rubber adhesive (trade name EC776: manufactured by Sumitomo 3M) was applied to the back surface of the above reversible thermosensitive recording member to form an adhesive layer having a thickness of about 40 μm.
Next, a release paper was applied onto the adhesive layer, and punched into an arbitrary size to prepare a reversible thermosensitive recording label sheet of the present invention. This label sheet was adhered on a vinyl chloride card having a thickness of 500 μm.

Example 2 A nitrile rubber adhesive (trade name EC776: manufactured by Sumitomo 3M) was applied on a PET film having a thickness of 200 μm to form an adhesive layer having a thickness of about 40 μm. After the PET film was adhered to the back surface of the reversible thermosensitive recording member obtained in Example 1 through the adhesive layer, the label sheet of the present invention was prepared in the same manner as in Example 1. This label sheet was adhered on a vinyl chloride card having a thickness of 500 μm.

Example 3 Instead of the PET film having a thickness of 200 μm in Example 2, a high-quality paper (thickness 2) coated or printed with black ink was used.
The label sheet of the present invention was prepared in the same manner as in Example 2 except that the label sheet of the present invention was used. 50 this label sheet
It was adhered on a PVC card having a thickness of 0 μm.

Example 4 Except that a non-adhesive portion having air inside was not provided with an adhesive in a part of the adhesive layer between the PET film having a thickness of 200 μm and the thermosensitive recording member in Example 2. A label sheet of the present invention was prepared in the same manner as in Example 2. This label sheet was adhered on a vinyl chloride card having a thickness of 500 μm.

Example 5 Part of the adhesive layer between the high-quality paper (thickness: 200 μm) coated or printed with the black ink and the thermal recording member in Example 3 was filled with air inside the adhesive-free layer. A label sheet of the present invention was produced in the same manner as in Example 3 except that the non-adhesive portion was provided. This label sheet was adhered on a vinyl chloride card having a thickness of 500 μm.

Example 6 A label sheet of the present invention was prepared in the same manner as in Example 2 except that a 200 μm-thick PET film vapor-deposited with Al was used instead of the 200 μm-thick PET film in Example 2. . This label sheet was adhered on a vinyl chloride card having a thickness of 500 μm.

Example 7 A label sheet of the present invention was produced in the same manner as in Example 4, except that a 200 μm-thick PET film with Al vapor deposition was used in place of the 200 μm-thick PET film in Example 4. . This label sheet was adhered on a vinyl chloride card having a thickness of 500 μm.

Example 8 Instead of the PET film having a thickness of 50 μm used in Example 1, white PET having a thickness of 188 μm was used, a magnetic recording layer was provided thereon, and an Al vapor-deposited layer was further provided thereon. A reversible thermosensitive recording layer similar to that in Example 1 was provided to prepare a reversible thermosensitive recording material. Further, using this reversible thermosensitive recording material, a label sheet of the present invention was prepared in the same manner as in Example 1. This label sheet was adhered on a vinyl chloride card having a thickness of 500 μm.

Example 9 The same as Example 8 except that an Al vapor deposition layer was provided on the side opposite to the magnetic recording layer, and a reversible thermosensitive recording layer similar to that of Example 1 was provided thereon. To produce the label sheet of the present invention. This label sheet was adhered on a vinyl chloride card having a thickness of 500 μm.

Example 10 The present invention was carried out in the same manner as in Example 1 except that a silicone pressure sensitive adhesive (trade name Araldite: manufactured by Nagase Ciba Co., Ltd.) was used instead of the nitrile rubber adhesive in Example 1. Label sheet was created. This label sheet is 500μ
It was adhered on an m-thick PVC card.

Using the label sheet adhesive card obtained as described above, an image was formed with an energy of 0.3 mj in a card recording device (prototype) having a thermal head of 8 dot / mm, and a 0.2 mj Repeated erasing with energy, for each sample,
No peeling of the label sheet from the PVC card occurred during the 100th repetition.

The ten types of reversible thermosensitive recording cards were evaluated for adhesive strength and image density at the initial stage and after 100 times of repetition. The results are shown in Table 1. The measuring method is as follows. Density measurement Measured with a Macbeth reflection densitometer RD-514. Adhesive strength It is represented by the average value of the tensile load (kgf / 25 mm) measured according to the method of JIS K-6854, 180 degree peeling. In addition, A and B respectively represent the adhesive strength between the following. Adhesive strength A: Adhesive strength between the reversible thermosensitive recording member and paper or film. Adhesive strength B ... Adhesive strength between the label sheet and the adherend.

[0059]

[Table 1]

Example 11 A UV printing layer having a thickness of 5 μm was provided by offset printing on the back surface of the reversible thermosensitive recording member obtained in Example 1, and a nitrile rubber adhesive (trade name EC776: Sumitomo) Three
(Manufactured by M Co.) was applied to form an adhesive layer having a thickness of about 40 μm. Next, a release paper was applied onto the adhesive layer, and punched into an arbitrary size to prepare a reversible thermosensitive recording label sheet of the present invention. This label sheet was adhered on a vinyl chloride card having a thickness of 500 μm.

Example 12 A nitrile rubber adhesive (trade name EC776: manufactured by Sumitomo 3M) was applied on a PET film having a thickness of 200 μm to form an adhesive layer having a thickness of about 40 μm. On the back surface of the reversible thermosensitive recording member obtained in Example 1, offset printing was performed.
A UV printing layer having a thickness of μm was provided, and the PET film was further adhered onto the UV printing layer via the adhesive layer.
A label sheet of the present invention was prepared in the same manner as in. This label sheet was adhered on a vinyl chloride card having a thickness of 500 μm.

Example 13 Except that a non-adhesive portion having air inside was not provided with an adhesive in a part of the adhesive layer between the PET film having a thickness of 200 μm and the thermosensitive recording member in Example 12. A label sheet of the present invention was prepared in the same manner as in Example 12.
This label sheet was adhered on a vinyl chloride card having a thickness of 500 μm.

Example 14 In place of the PET film having a thickness of 200 μm used in Example 13, a high-quality paper coated with or printed with black ink (thickness 200 μm) was used, and the adhesion between the high-quality paper and the heat-sensitive recording member. A label sheet of the present invention was produced in the same manner as in Example 13 except that a non-adhesive portion having air inside was provided on a part of the agent layer without applying an adhesive. This label sheet was adhered on a vinyl chloride card having a thickness of 500 μm.

Example 15 Instead of the nitrile rubber adhesive in Example 11,
A label sheet of the present invention was prepared in the same manner as in Example 11 except that a silicone pressure sensitive adhesive (trade name Araldite: manufactured by Nagase Ciba Co., Ltd.) was used. 50 this label sheet
It was adhered on a PVC card having a thickness of 0 μm.

Comparative Example A label sheet was prepared in the same manner as in Example 11 except that the printing layer in Example 11 was provided on the surface of the reversible thermosensitive recording member. This label tote was adhered onto a vinyl chloride card having a thickness of 500 μm.

Using the label sheet adhesive card obtained as described above, an image was formed with an energy of 0.3 mj in a card recording device (prototype) having a thermal head of 8 dots / mm, and an image of 0.2 mj was formed. When the erasing was repeated with energy, the sample of Comparative Example was scraped of the printing layer at the 10th time, but the samples of Examples 11 to 15 were repeatedly erased by the 100th time, and the label sheet of the vinyl chloride card No peeling occurred, and the printed layer was not scraped.

The adhesive strength of these six types of reversible thermosensitive recording cards and the image density at the initial stage and after 100 times of repetition were evaluated. The results are shown in Table 2. The measuring method is the same as for the samples of Examples 1-10.

[0068]

[Table 2]

Example 16 On a PET film having a thickness of 50 μm, a solution having the following composition was applied and dried by heating to provide a heat sensitive layer having a thickness of about 15 μm. Stearic acid 6 parts Eicosane diacid 4 parts Diisodecyl phthalate 2 parts Vinyl chloride / vinyl acetate / phosphorus ester copolymer 20 parts (Denka Vizier # 1000P manufactured by Denki Kagaku Kogyo KK) THF 150 parts Toluene 15 parts

Next, a solution consisting of 5 parts of polyamide resin (CM8000, manufactured by Toray Industries, Inc., CM8000) and 90 parts of methyl alcohol was applied on the heat-sensitive layer with a wire bar and dried by heating to form an intermediate layer having a thickness of about 0.3 μm. Further, a butyl acetate solution of urethane acrylate UV curable resin (Unidick Ci-157 manufactured by Dainippon Ink and Chemicals Co., Ltd.) is further applied thereto by a wire bar, and after heating and drying, UV rays are applied for 3 seconds by an 80 W / cm UV lamp. Irradiation provided an overcoat layer having a thickness of about 3 μm to prepare a reversible thermosensitive recording member.

Next, a nitrile rubber adhesive (trade name EC776: manufactured by Sumitomo 3M) was applied to the back surface of the above reversible thermosensitive recording member to form an adhesive layer having a thickness of about 40 μm.
Next, a release paper was applied on the adhesive layer, and punched into an arbitrary size to prepare a label sheet of the reversible thermosensitive recording material of the present invention. This label sheet was adhered to a black printed portion on a vinyl chloride card having a thickness of 500 μm. The step between the PVC card and the label sheet at this time is 100 to 110 μm.

Example 17 Al was vapor-deposited on a PET film having the same thickness as that used in Example 16 and a thickness of 50 μm, and a reversible thermosensitive recording member was formed on the surface in the same manner as in Example 16, and the same as in Example 16. To produce the label sheet of the present invention. This label sheet was adhered on a vinyl chloride card having a thickness of 500 μm. The step between the PVC card and the label sheet at this time is 100 to 110 μm.

Example 18 Except that a non-adhesive portion having air inside was not provided with an adhesive in a part of the adhesive layer between the PET film having a thickness of 50 μm and the thermosensitive recording member in Example 16. A label sheet of the present invention was prepared in the same manner as in Example 16. The non-adhesive part of this label sheet was adhered to the black printed part on the vinyl chloride card having a thickness of 500 μm. The step between the PVC card and the label sheet at this time is 100 to 110 μm.

Example 14 The label sheet obtained in Example 17 was adhered to the recess of a vinyl chloride card having a thickness of 500 μm. At this time, the step difference between the PVC card and the label sheet is 50 to 70 μm.

Example 20 The label sheet obtained in Example 18 was adhered to the black printed portion of the recess of a 500 μm thick PVC card. At this time, the step between the PVC card and the label sheet is 50 to 70 μm.
Is.

Example 21 An acrylic foam adhesive (trade name Y-4914: Sumitomo 3M) was formed on the back surface of the reversible thermosensitive recording member obtained in Example 17.
A label sheet was prepared in the same manner as in Example 17, except that a pressure-sensitive adhesive layer was provided using a product manufactured by Mfg. Co., Ltd., and this was adhered to a vinyl chloride card. The step between the PVC card and the label sheet at this time is 200 μm.

Example 22 The label sheet obtained in Example 21 was adhered to the same PVC card as used in Example 19. At this time, the step between the PVC card and the label sheet is 150 μm.

Example 23 In Example 18, an acrylic foam adhesive (trade name Y-4914: Sumitomo 3) was used instead of the nitrile rubber adhesive.
A label sheet was prepared in the same manner as in Example 18 except that (M Co., Ltd.) was used, and the label sheet was adhered to the same PVC card used in Example 20. At this time, the step between the PVC card and the label sheet is 150 μm.

Using the label sheet adhesive card obtained as described above, a thermal head pressure of 1 kg / 100 mm width and an energy of 0.3 mj was set in a card recording device (prototype) having a thermal head of 8 dot / mm. The image formation and the erasing with the energy of 0.2 mj were repeated, and no peeling of the label sheet from the PVC card occurred and no print out was found in any of the samples up to 100 times. It was

The image density and scratches of these eight types of reversible thermosensitive recording cards were evaluated at the initial stage and after 100 times of repetition. The results are shown in Table 3. The concentration measuring method is the same as that of the samples of Examples 1 to 10.
The scratches were visually evaluated.

[0081]

[Table 3]

From Tables 1 to 3, the label sheet of the present invention is
It can be seen that the high quality image is maintained even if the image recording and erasing are repeated many times.

[0083]

The reversible thermosensitive recording label of claim 1 and the reversible thermosensitive recording card of claim 7 have an adhesive layer or a pressure-sensitive adhesive layer on the surface of the reversible thermosensitive recording member whose transparency reversibly changes by heat. Since the release paper is provided or the adherend is adhered through, a high-quality image is maintained even if the image is repeatedly formed and erased by using a heating means such as a thermal head. It

The reversible thermosensitive recording label according to claim 2 and the reversible thermosensitive recording card according to claim 8 are the same when the adhesive layer or the pressure-sensitive adhesive layer and the adherend are adhered to each other, or the adhesive layer or the pressure-sensitive adhesive layer is adhered. The adhesive strength between the agent layer and the adherend is JIS K
When expressed as the average value of the tensile load measured by the peeling method of -6854 and 180 degrees, it was set to be 0.5 kgf / 25 mm or more. Therefore, the formation and deletion of an image using a heating means such as a thermal head. Even if the process is repeated a number of times, the effect that peeling does not occur at the carrying section is added.

In the reversible thermosensitive recording label according to claim 3, since the material forming the adhesive layer or the pressure-sensitive adhesive layer has elasticity, the thermal head pressure can be reduced. And because it can prevent scratches,
Further, the effect of obtaining a high quality image is added.

In the reversible thermosensitive recording label according to claim 4, a printing layer is further provided between the reversible thermosensitive recording member and the adhesive layer or the pressure-sensitive adhesive layer. Even if the image forming and erasing are repeated a number of times by using, the effect that the print layer is not scraped is added.

In the reversible thermosensitive recording label of claim 5, since at least two adhesive layers or pressure-sensitive adhesive layers are provided via paper or film, a heating means such as a thermal head is used. Even if an image is formed and erased a number of times by using it, the effect of cushioning the adhesive layer (adhesive layer) can further prevent the occurrence of image breakage, erasing failure, and the like.

The reversible thermosensitive recording label according to claim 6 and the reversible thermosensitive recording card according to claim 9 have a structure in which a part of the adhesive (adhesive) layer has no adhesive (adhesive). As a result, the effect of improving the image contrast is added.

According to the reversible thermosensitive recording of claim 10, the card is
Since the magnetic recording layer and / or the reflective film layer or the colored layer is provided, the effect of being applicable to a magnetic card or / and further improving the image contrast is added.

In the reversible thermosensitive recording card according to claim 11, since the surface of the thermosensitive recording member is made higher than the entire surface of the adherend, no printout is generated even if the adherend is deformed. The effect of obtaining an image is added.

[Brief description of drawings]

FIG. 1 is a diagram showing a change in transparency of a reversible thermosensitive recording material according to the present invention due to heat.

FIG. 2 is a schematic cross-sectional view showing the basic structure of the reversible thermosensitive recording label of the present invention.

FIG. 3 is a schematic cross-sectional view showing another constitution of the reversible thermosensitive recording label of the present invention.

FIG. 4 is a schematic sectional view showing another constitution of the reversible thermosensitive recording label of the present invention.

FIG. 5 is a schematic cross-sectional view showing another constitution of the reversible thermosensitive recording label of the present invention.

FIG. 6 is a schematic cross-sectional view showing another constitution of the reversible thermosensitive recording label of the present invention.

FIG. 7 is a schematic cross-sectional view showing another constitution of the reversible thermosensitive recording label of the present invention.

FIG. 8 is a schematic cross-sectional view showing another constitution of the reversible thermosensitive recording label of the present invention.

FIG. 9 is a schematic cross-sectional view showing another constitution of the reversible thermosensitive recording label of the present invention.

FIG. 10 is a schematic cross-sectional view showing another constitution of the reversible thermosensitive recording label of the present invention.

FIG. 11 is a schematic cross-sectional view showing another constitution of the reversible thermosensitive recording label of the present invention.

FIG. 12 is a schematic cross-sectional view showing another constitution of the reversible thermosensitive recording label of the present invention.

FIG. 13 is a schematic cross-sectional view showing another constitution of the reversible thermosensitive recording label of the present invention.

FIG. 14 is a schematic cross-sectional view showing another constitution of the reversible thermosensitive recording label of the present invention.

FIG. 15 is a schematic cross-sectional view showing another constitution of the reversible thermosensitive recording label of the present invention.

FIG. 16 is a schematic cross-sectional view showing another constitution of the reversible thermosensitive recording label of the present invention.

FIG. 17 is a schematic cross-sectional view showing the basic structure of the reversible thermosensitive recording card of the present invention.

FIG. 18 is a schematic cross-sectional view showing another constitution of the reversible thermosensitive recording card of the present invention.

FIG. 19 is a schematic cross-sectional view showing another constitution of the reversible thermosensitive recording card of the present invention.

FIG. 20 is a schematic cross-sectional view showing another structure of the reversible thermosensitive recording card of the present invention.

FIG. 21 is a schematic cross-sectional view showing the structure of a conventional reversible thermosensitive recording card.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Reversible thermosensitive recording layer 2 Reversible thermosensitive recording member 3 Support 4 Adhesive layer or pressure sensitive adhesive layer 5 Release paper 6 Adhesive layer or pressure sensitive adhesive layer 7 Paper or film 8 Non-adhesive part 9 Reflective film layer or colored layer 10 Magnetic recording layer 11 Adherent 12 Reversible thermosensitive recording label 13 Display section 14 Printing layer

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Nogori Dori, Nakamagome 1-3-6, Tokyo, Ota-ku, Tokyo Stock company Ricoh (72) Inventor Tsutomu Kagawa 1-3-3, Nakamagome, Ota-ku, Tokyo Share Inside Ricoh Company (72) Inventor Nobuo Yamada 1-3-6 Nakamagome, Ota-ku, Tokyo Inside Ricoh Company, Ltd.

Claims (11)

[Claims] 1. A reversible thermosensitive recording comprising an adhesive layer or a pressure-sensitive adhesive layer provided on the surface of a reversible thermosensitive recording member whose transparency is reversibly changed by heat, and a release paper provided thereon. label. 2. The adhesive layer or the pressure-sensitive adhesive layer has adhesive strength according to JIS K-6854, 1 when bonded to an adherend.
The reversible thermosensitive recording label according to claim 1, wherein the reversible thermosensitive recording label has a tensile load of 0.5 kgf / 25 mm or more when expressed by the average value of the tensile load measured by the 80-degree peeling method. 3. The material forming the adhesive layer or the pressure-sensitive adhesive layer has elasticity.
Alternatively, the reversible thermosensitive recording label according to item 2. 4. The reversible sensation according to claim 1, further comprising a printing layer provided between the reversible thermosensitive recording member and the adhesive layer or the pressure-sensitive adhesive layer. Thermal recording label. 5. The reversible thermosensitive recording label according to claim 1, wherein at least two adhesive layers or pressure-sensitive adhesive layers are provided via a paper or a film. . 6. The adhesive layer or the pressure-sensitive adhesive layer has a portion to which the adhesive agent or the pressure-sensitive adhesive is not applied.
The reversible thermosensitive recording label according to any one of items 1 to 5. 7. The reversible method using the heat-sensitive recording label according to claim 1, wherein an adherend is adhered on the adhesive layer or the pressure-sensitive adhesive layer. Sensitive recording card. 8. When the adhesive strength between the adhesive layer or the pressure-sensitive adhesive layer and the adherend is represented by an average value of tensile loads measured by the method of 180 ° peeling according to JIS K-6854,
The reversible thermosensitive recording card according to claim 7, which has a weight of 0.5 kgf / 25 mm or more. 9. A reversible thermosensitive recording card using a thermosensitive recording label according to claim 6, wherein a portion not provided with an adhesive or an adhesive is used as a display portion. 10. The reversible thermosensitive recording card according to claim 7, further comprising a magnetic recording layer and / or a reflective film layer or a colored layer. 11. The thermosensitive recording member surface is made higher than the entire surface of the adherend when the adhesive layer or the pressure-sensitive adhesive layer is adhered to the embedded portion of the adherend. The reversible thermosensitive recording card according to any one of 7 to 10.