JPH0538874A - Reversible heat-sensitive recording material - Google Patents

Abstract

PURPOSE:To make images formable and erasable uniformly by a method wherein an anchor layer mainly composed of resin having rubbery elasticity is provided between a support and a heat-sensitive layer. CONSTITUTION:A heat-sensitive layer that reversibly varies its transparency depending on temperature and is composed of resin base in which organic low molecular substance is scattered is provided over a support, and an anchor layer mainly composed of resin having rubbery elasticity is provided between the support and the heat-sensitive layer, and thereby a reversible heat-sensitive recording material is made up. With such arrangement, adhesion between a heating element such as a thermal head or the like and the reversible heat- sensitive recording material is enhanced, enabling heat to be conveyed uniformly, and thereby uniform formation and erasion of images can be materialized.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reversible thermosensitive recording material for recording and erasing by utilizing reversible change in transparency with temperature.

[0002]

2. Description of the Related Art In recent years, reversible thermosensitive recording materials have been attracting attention because they enable temporary image formation and can erase the image when it is no longer needed. A typical example is a resin matrix such as a vinyl chloride-vinyl acetate copolymer having a low glass transition temperature (Tg) of 50-60 ° C to less than 80 ° C. Reversible heat-sensitive recording materials having a heat-sensitive layer in which organic low molecular weight substances are dispersed are known (JP-A-54-119377, JP-A-55-154198, etc.).

Further, a reversible thermosensitive recording material in which a protective layer is provided on the thermosensitive layer in order to protect the thermosensitive layer is also known (JP-A-1-133781, JP-A-2-566, JP-A-63). -221087
In addition, in order to protect the heat-sensitive layer from the monomer components and solvent of the protective layer liquid, an intermediate layer using an alcohol solvent is provided between the protective layer and the heat-sensitive layer. A reversible thermosensitive recording material provided is also known (Japanese Patent Laid-Open No. 1-133781).
Issue).

However, when image formation and erasure of these reversible thermosensitive recording materials are performed with a heat roller, a thermal head, etc., the reversible thermosensitive recording material, the thermal head, etc., are left on the surface where irregularities such as dust and dust adhere to the surface. However, there is a gap between the heating element and the heating element, and heat is not transferred to the reversible thermosensitive recording material. Therefore, there is a drawback that uniform image formation and erasing cannot be performed.

There is no problem when the support is a polyester film, but recently, in the field of cards, many credit cards and cash cards are used, and the support of these cards is a hard polyvinyl chloride film. The vinyl film has a drawback that it dissolves and is damaged by a solvent-based heat-sensitive recording layer formulation. Further, the support made of the hard polyvinyl chloride film has a considerably high hardness, and the heat-sensitive recording layer coated on the support has a poor matching property with a thermal head, so that a high quality image cannot be obtained.

[0006]

DISCLOSURE OF THE INVENTION The present invention solves the above-mentioned drawbacks and provides good adhesion to a heating body even if dust, dust, etc. adhere to the surface of the heat-sensitive layer, and a rigid polyvinyl chloride film on the support. The present invention provides a reversible thermosensitive recording material in which the support is not damaged by dissolution due to a solvent even when it is used, has excellent adhesion to a heating body, and allows uniform image formation and erasing.

[0007]

According to the present invention, a resin base material and an organic low molecular weight substance dispersed in the resin base material as a main component are used as a main component on a support, and transparency is reversibly reversible depending on temperature. A reversible thermosensitive recording material having a changing thermosensitive layer, wherein an anchor layer containing a resin having rubber elasticity as a main component is provided between a support and the thermosensitive layer. Further, on a support made of a hard polyvinyl chloride film, a resin base material and an organic low molecular weight substance dispersed in the resin base material as a main component, and the transparency reversibly changes depending on the temperature. In a reversible thermosensitive recording material provided with a thermosensitive layer, there is provided a reversible thermosensitive recording material characterized in that an anchor layer is provided between a support and a thermosensitive layer. In particular, the anchor layer contains an aqueous solvent. Apply the used resin liquid on the support It is intended that provided dried, or the anchor layer, the reversible thermosensitive recording material characterized by comprising a resin having rubber elasticity is provided.

That is, in the present invention, by using a resin having "elongation" of 100% or more as the resin having rubber elasticity of the anchor layer, dust, dust and the like adhere to the surface of the reversible thermosensitive recording material. Also, when the image is formed and erased by heating with a thermal head or the like, the resin having rubber elasticity of the anchor layer shrinks, so that the adhesion between the reversible thermosensitive recording material and the thermal head etc. improves Since heat is evenly transferred to the thermal recording material, uniform image formation and erasing can be performed. The "elongation" of a resin having rubber elasticity is calculated by the following formula 1 (JIS K 6301).

[Equation 1]

FIGS. 2 and 3 show dust and dust between the reversible heat-sensitive recording material and the thermal head, each of which uses a resin having rubber elasticity and a resin having no rubber elasticity as an anchor layer.
The close contact state when dust is present is shown. FIG. 2 shows a case of a reversible thermosensitive recording material using a resin having rubber elasticity for the anchor layer, and FIG. 3 shows a case of a reversible thermosensitive recording material using a resin having no rubber elasticity for the anchor layer.

Resins having rubber elasticity include silicone rubber, butadiene rubber, urethane rubber, isoprene rubber, nitrile butadiene rubber, highly saturated nitrile rubber, ethylene propylene rubber, fluorine rubber, styrene butadiene rubber, chloroprene rubber, acrylic rubber, chloro. Examples thereof include sulfonated polyethylene rubber, chlorinated polyethylene, ethylene acrylic rubber, epichlorohydrin rubber, polysulfide rubber and butyl rubber.

When a rigid polyvinyl chloride film is used as the support, the anchor layer forming coating solution that does not dissolve the polyvinyl chloride film and does not dissolve in the heat sensitive layer forming coating solution is (1) ) A resin liquid using an alcohol solvent, (2) a resin liquid using an aqueous solvent, and (3) a curable resin liquid.

(1) As a resin constituting a resin liquid using an alcohol solvent, a resin containing a polyamide resin, which is particularly resistant to an organic solvent, as a main component is particularly desirable. Polyamide resin is a linear synthetic polymer substance composed of a large number of amide group-bonded alkylene groups, and is represented by nylon. For nylon, nylon mn (m is diamine, n
Is a dibasic acid) and nylon n (n is the number of carbon atoms in ω-amino acid or lactam), and the former type is produced on an industrial scale. Nylon 6-6 (polyhexamethylene adipamide, condensation polymer of hexamethylene diamine and adipic acid), Nylon 6-10 (polyhexamethylene sebasamide,
Condensation polymer of hexamethylenediamine and sebacic acid), nylon 6 (polycapramide, ring-opening polymer of ε-caprolactam), nylon 11 (polyundecanamid, ω)
-Aminoundecanoic acid condensation polymer), Nylon 12 (laurinlactam ring-opening polymer), etc. Other examples include copolymerized nylon, chemically modified nylon, and those to which special additives are added. A typical three-dimensional polymer of 6 / 6-6 / 6-10 is a typical nylon copolymer,
There are also copolymers of 6 / 6-6 / bis (4-aminocyclohexyl) methane-6 and those obtained by partially copolymerizing 11,12 or other nylon. Examples of the modified nylon include N-alkoxymethyl modified nylon (type 8 nylon). These copolymerized nylon and modified nylon are methanol,
It is also called alcohol-soluble nylon because it dissolves in ethanol or a mixed liquid of these and a chlorinated hydrocarbon such as trichlene. Other examples include ultra-high degree of polymerization nylon synthesized by adding a phosphoric acid solvent, non-crystalline transparent nylon, and microcrystalline nylon added with a crystal nucleating agent. Further, it is also possible to crosslink these with melamine, epoxy or the like to improve heat resistance and moisture resistance.

(2) Polyvinyl alcohol, which is particularly resistant to organic solvents, is preferable as the resin constituting the resin liquid using an aqueous solvent. Further, heat resistance and moisture resistance can be improved by crosslinking with a crosslinking agent such as melamine.

(3) As the curable resin liquid, the above (1) and
Examples of the resin of (2) include a cross-linking type resin and a water-based emulsion type resin to which a cross-linking agent is added.

The thickness of the anchor layer is preferably about 0.1 to 50 μm, particularly preferably 0.2 to 20 μm.

The reversible thermosensitive recording material of the present invention utilizes the transparency change (transparent state, cloudy opaque state) as described above, and the difference between the transparent state and the cloudy opaque state is presumed as follows. .. That is, in the case of (I) transparent, the particles of the organic low molecular weight substance dispersed in the resin base material are composed of large particles of the organic low molecular weight substance, and the light incident from one side is not scattered and is opposite. When it is cloudy, the particles of the organic low molecular weight substance are composed of polycrystals of fine crystals of the organic low molecular weight substance, and the crystal axis of each crystal Since the light is directed in various directions, the light incident from one side is refracted many times at the interface of the crystals of the organic low molecular weight substance particles, and the light appears white because it is scattered.

In FIG. 1 (representing the change in transparency due to heat), a thermosensitive 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 _0.
It is cloudy and opaque at room temperature below. When it is heated to a temperature T ₂ , it becomes transparent, and even if it is returned to room temperature below T _{0 in} this state, it remains transparent. It is considered that this is because the organic low-molecular-weight substance undergoes a semi-molten state from the temperature T ₂ to T ₀ or lower and the crystal grows from a polycrystal to a single crystal. Further T ₃
When heated to the above temperature, a semi-transparent state intermediate between maximum transparency and maximum opacity is obtained. Next, when this temperature is lowered, the initial cloudy opaque state is restored without taking the transparent state again. It is considered that this is because the organic low-molecular-weight substance melts at a temperature of T ₃ or higher and is then cooled to precipitate polycrystals. 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, it can take both opaque and transparent forms at room temperature and intermediate forms thereof.

Therefore, the heat sensitive layer can be selectively heated by selectively applying heat to form a cloudy image on a transparent background, a cloudy image in addition to cloudiness, 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 layer, an image of the color of the coloring sheet or a white image of the background of the coloring sheet can be formed on a white background. Also, when projected with an OHP (overhead projector) or the like, the cloudy part becomes a dark part, and the transparent part transmits light and becomes a bright part on the screen.

To make the reversible thermosensitive recording material according to the present invention, generally, (1) a solution in which two components of a resin base material and an organic low molecular weight substance are dissolved, or (2) a solution of a resin base material (the solvent is an organic solvent) A plastic film, in particular a hard polyvinyl chloride film, a glass plate, a metal, in which a dispersion liquid in which an organic low-molecular substance is dispersed in the form of fine particles is used to dissolve at least one of low-molecular substances is used) The heat sensitive layer may be formed by coating and drying it on a support such as a plate.

The solvent for preparing the heat-sensitive layer or the heat-sensitive recording material can be variously selected depending on the type 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 base material used for the heat-sensitive layer is a material that forms a layer in which an organic low molecular weight substance is uniformly dispersed and held, and affects the transparency at the time of maximum transparency. Therefore, the resin base material is preferably a resin having good transparency, mechanical stability, and good film forming property.

Examples of such resins include polyvinyl chloride, vinyl chloride-vinyl acetate copolymer, vinyl chloride-vinyl acetate-vinyl alcohol copolymer, vinyl chloride-vinyl acetate-maleic acid copolymer, vinyl chloride- Vinyl chloride-based copolymers such as acrylate copolymers; polyvinylidene chloride, vinylidene chloride-vinyl chloride copolymers, vinylidene chloride-based copolymers such as vinylidene chloride-acrylonitrile copolymers; polyesters; polyamides; polyacrylates or polyacrylates Methacrylate or acrylate-methacrylate copolymer; silicone resin and the like can be mentioned. These may be used alone or in admixture of two or more.

On the other hand, as the organic low molecular weight substance, any substance which changes from polycrystal to single crystal due to heat in the recording layer may be used, and generally, one having a melting point of 30 to 200 ° C., preferably about 50 to 150 ° C. is 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; 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 Of their esters, amides or ammonium salts; thioalcohols; thiocarboxylic acids or their esters, amines or ammonium salts; of thioalcohols Carboxylic acid esters, and the like. These may be used alone or in combination of two or more. The carbon number of these compounds is 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, -COOH, -CONH.
-, - COOR, -NH -, - NH 2, -S -, - SS -, - O-, is preferably a compound containing a halogen and the like.

More specifically, these compounds include lauric acid, dodecanoic acid, myristic acid, pentadecanoic acid, palmitic acid, stearic acid, behenic acid, nonadecanoic acid, alginic acid, oleic acid and other higher fatty acids; methyl stearate. Ester of higher fatty acid such as tetradecyl stearate, octadecyl stearate, octadecyl laurate, tetradecyl palmitate, dodecyl behenate; C ₁₆ H ₃₃ -OC ₁₆ H ₃₃ , C ₁₆ H ₃₃ -SC ₁₆ H ₃₃ , C ₁₈ H ₃₇ -SC ₁₈ H ₃₇ , C ₁₂ H ₂₅ -SC ₁₂ H ₂₅ , C ₁₉ H ₃₉ -SC ₁₉ H ₃₉ , C ₁₂ H ₂₅ -SSC ₁₂ H ₂₅ , Etc., such as ether or thioether. Among them, higher fatty acids, particularly higher fatty acids having 16 or more carbon atoms, such as palmitic acid, stearic acid, behenic acid, and lignoceric acid, are preferable in the present invention, and higher fatty acids having 16 to 24 carbon atoms are more preferable.

In order to widen the range of temperatures at which the material can be made transparent, the organic low molecular weight substances described in this specification may be appropriately combined, or such organic low molecular weight substances may be combined with other materials having different melting points. .. These are, for example, JP-A-63-3
Publications such as 9378 and JP-A-63-130380, and Japanese Patent Application No. 63-14
No. 754 and Japanese Patent Application No. 1-140109 are disclosed, but the invention is not limited thereto. The ratio of the organic low molecular weight substance and the resin base material in the heat sensitive layer is 2: 2 by weight.
It is preferably about 1 to 1:16, more preferably 1: 1 to 1: 3. When the ratio of the resin base material is less than this, it becomes difficult to form a film in which the organic low molecular weight substance is retained in the resin base material. Becomes difficult.

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-ethylhexyl phosphate, triphenyl phosphate, tricresyl phosphate, butyl oleate, dimethyl phthalate, diethyl phthalate, dibutyl phthalate, diheptyl phthalate, diphthalate. -n-octyl, di-2-ethylhexyl phthalate, diisononyl phthalate, dioctyldecyl phthalate, diisodecyl phthalate, butylbenzyl phthalate, dibutyl adipate, di-n-hexyl adipate, di-adipate
2-ethylhexyl, di-2-ethylhexyl azelate, dibutyl sebacate, di-2-ethylhexyl sebacate, diethylene glycol dibenzoate, triethylene glycol di-2-ethylbutyrate, methyl acetylricinoleate, butyl acetylricinoleate, butyl Phthalyl butyl glycolate, tributyl acetyl citrate. 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 adduct of oil 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 phosphoric acid mono- or di-ester Ca , Ba or Mg salts; low-sulfated oils; poly-long-chain alkyl acrylates; acrylic orgomers; poly-long-chain alkyl methacrylates; long-chain alkyl methacrylate-amine containing monomer copolymers; styrene-maleic anhydride copolymers; olefins In-maleic anhydride copolymer.

When an image of this recording material is used as a reflection image, if a layer that reflects light is provided on the back surface of the recording layer, the contrast can be increased even if the thickness of the recording layer is reduced. Specifically, vapor deposition of Al, Ni, Sn and the like can be mentioned (described in JP-A-64-14079).

A protective layer may be provided on the heat-sensitive layer to protect the heat-sensitive layer. As a material for the protective layer (thickness of 0.1 to 5 μm) laminated on the heat-sensitive layer, silicone rubber, silicone resin (described in JP-A-63-221087),
Polysiloxane graft polymer (described in Japanese Patent Application No. 62-152550), UV curable resin or electron beam curable resin (Japanese Patent Application No. 63-3
No. 10600) 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. As a solvent in which it is difficult to dissolve the resin and the organic low molecular weight substance of the heat sensitive layer, n-hexane, methyl alcohol, ethyl alcohol,
Examples include isopropyl alcohol and the like, and an alcohol solvent is particularly preferable from the viewpoint of cost.

Furthermore, an intermediate layer may be provided between the protective layer and the heat-sensitive layer in order to protect the heat-sensitive layer from the solvent and monomer components of the protective layer-forming liquid (Japanese Patent Laid-Open No. 1-133781). Description). As the material of the intermediate layer, in addition to those listed as the resin base material in the heat-sensitive layer, the following thermosetting resin,
Thermoplastic resins can be used. That is, polyethylene,
Examples thereof include polypropylene, polystyrene, polyvinyl alcohol, polyvinyl butyral, polyurethane, saturated polyester, unsaturated polyester, epoxy resin, phenol resin, polycarbonate and polyamide. The thickness of the intermediate layer is preferably about 0.1 to 2 μm.

[0031]

EXAMPLES The present invention will be described in more detail by way of examples, but the present invention is not limited thereto. In addition, both parts and% are based on weight. Example 1 A solution of 10 parts of styrene / butadiene copolymer (manufactured by Mitsui Toatsu Co., Ltd .: Polylac 750) and 10 parts of water was applied onto a polyester film having a thickness of about 100 μm to form an anchor layer having a thickness of 5 μm.
Furthermore, behenic acid 6 parts eicosane diacid 4 parts diisodecyl phthalate 3 parts vinyl chloride-vinyl acetate copolymer (UCY VYHH) 25 parts T.I. H. F 150 parts Toluene 15 parts A solution consisting of 15 parts is applied with a wire bar and dried by heating.
A reversible thermosensitive recording material was prepared by providing an 8 μm thermosensitive layer (reversible thermosensitive recording layer). A solution of 10 parts of a polyamide resin (CM8000 manufactured by Toray Industries, Inc .: CM8000) and 90 parts of methanol was further applied thereon, and dried by heating to form an intermediate layer of 1 μm thickness. A 75% butyl acetate solution of urethane acrylate UV-curable resin (Unidick C7-157, manufactured by Dainippon Ink & Chemicals, Inc.) 10 parts Toluene 10 parts was applied with a wire bar, and after heating and drying. , 80
A reversible thermosensitive recording material was prepared by curing with a w / cm ultraviolet lamp and providing an overcoat layer having a thickness of about 2 μm.

Example 2 As an anchor layer solution, an ester urethane acrylate-based UV-curable resin 80% butyl acetate solution (manufactured by Dainichi Ink & Chemicals, Unidick V-4220) 10 parts Toluene 10 parts was applied. A reversible heat-sensitive recording material was prepared in the same manner as in Example 1 except that it was dried by heating and then cured with an ultraviolet lamp to provide an anchor layer having a thickness of 20 μm.

Example 3 A reversible thermosensitive recording material was prepared in the same manner as in Example 1 except that 10 parts of butadiene resin (JSR RB820 manufactured by Japan Synthetic Rubber Co., Ltd.) toluene was used as the anchor layer solution.

Example 4 On a hard polyvinyl chloride film having a thickness of about 0.8 mm, a solution containing 15 parts of polyamide resin (CM8000 manufactured by Toray Industries, Inc .: CM8000) and 85 parts of methanol was applied, dried by heating to form an anchor layer having a thickness of 5 μm. Provided. Then, a solution consisting of behenic acid 6 parts eicosane diacid 4 parts diisodecyl phthalate 3 parts vinyl chloride-vinyl acetate copolymer (ucc VYHH) 25 parts THF 150 parts toluene 15 parts was applied with a wire bar. Heat dried
A reversible thermosensitive recording material was prepared by providing an 8 μm thermosensitive layer (reversible thermosensitive recording layer). A 75% butyl acetate solution of urethane acrylate UV-curable resin (Unidick C7-157 manufactured by Dainippon Ink & Chemicals, Inc.) 10 parts Toluene 10 parts solution was applied with a wire bar, and after heating and drying , 80
A reversible thermosensitive recording material was prepared by curing with a w / cm ultraviolet lamp and providing an overcoat layer having a thickness of about 2 μm.

Example 5 As an anchor layer solution, a reversible thermosensitive material was prepared in the same manner as in Example 4 except that a solution containing 5 parts of polyvinyl alcohol and 100 parts of water was applied, heated and dried, and an anchor layer of about 8 μm was provided. The recording material was created.

Example 6 As an anchor layer solution, an ester urethane acrylate-based UV-curable resin 80% butyl acetate solution (manufactured by Dainichi Ink & Chemicals Co., Unidick V-4220) 10 parts Toluene 10 parts was applied. A reversible thermosensitive recording material was prepared in the same manner as in Example 4 except that the material was dried by heating and then cured with an ultraviolet lamp to provide an anchor layer having a thickness of 20 μm.

Example 7 A reversible thermosensitive recording material was prepared in the same manner as in Example 4 except that 10 parts of butadiene resin (JSR RB820 manufactured by Japan Synthetic Rubber Co., Ltd.) was used as the anchor layer solution.

Comparative Example A reversible thermosensitive recording material was prepared in the same manner as in Example 1 except that the anchor layer was not used.

Regarding the reversible thermosensitive recording material prepared as described above, first, the uniformity of the coating surface was observed and evaluated,
Then print with a thermal head (8 dots / mm), applied power 1 w, applied pulse width 0.7 msec.
White cloudy image when erased transparently at ~ 85 ℃, 10mm / min-
The erasure uniformity was visually judged. The results are shown in Table 1.

[0040]

[Table 1]

[0041]

As is apparent from the description of the embodiments of the present invention, the reversible thermosensitive recording material of the present invention can be used as a heating member such as a thermal head and a reversible thermosensitive recording material by forming the anchor layer with a resin having rubber elasticity. The adhesion is improved and heat is evenly transferred, so that there is an effect that a uniform image can be formed and erased. Further, even when a hard polyvinyl chloride film is used for the support, there is an effect that the coating surface is excellent in uniformity without being adversely affected by the heat-sensitive layer forming coating liquid.

[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 shows the adhesion of a reversible thermosensitive recording material of the present invention using a resin having rubber elasticity as an anchor layer to a thermal head.

FIG. 3 shows the adhesion of a reversible thermosensitive recording material of a comparative example using a resin having no rubber elasticity as an anchor layer to a thermal head.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor, Kunichika Moroboshi 1-3-3 Nakamagome, Ota-ku, Tokyo Within Ricoh Co., Ltd. (72) Inventor Nogori Dori 1-3-6 Nakamagome, Ota-ku, Tokyo In Ricoh Co., Ltd. (72) Inventor Akira Suzuki 1-3-6 Nakamagome, Ota-ku, Tokyo Inside Ricoh Co., Ltd.

Claims (4)

[Claims] 1. A reversible device comprising a support and a heat-sensitive layer which comprises a resin base material and an organic low-molecular substance dispersed in the resin base material as a main component, and whose transparency reversibly changes depending on temperature. A reversible thermosensitive recording material, characterized in that an anchor layer containing a resin having rubber elasticity as a main component is provided between a support and a thermosensitive layer. 2. A support comprising a hard polyvinyl chloride film, comprising a resin base material and an organic low molecular weight substance dispersed in the resin base material as a main component, and the transparency reversibly changes depending on the temperature. A reversible heat-sensitive recording material having a heat-sensitive layer, wherein an anchor layer is provided between the support and the heat-sensitive layer. 3. The reversible thermosensitive recording material according to claim 2, wherein the anchor layer is formed by coating a resin solution using an aqueous solvent on the support and drying the resin solution. 4. The reversible thermosensitive recording material according to claim 2, wherein the anchor layer is made of a resin having rubber elasticity.