JPH05124346A - Reversible thermal recording material - Google Patents

Abstract

PURPOSE:To obtain a reversible thermal recording material which allows an image with high white turbidity to be formed, if pressure or thermal energy is low, further prevents a flaw from generating on the surface and also a head waste from sticking to the surface, if an image is repeatedly formed or deleted with the minimized deterioration of white turbidity, and which is provided with a non-contact part between a thermal recording member and a cushion layer. CONSTITUTION:The subject reversible thermal recording material consists of a thermal layer containing a resin material and an organic low molecular substance dispersed in the former as main components and allowing the reversible change to take place from a transparent state to a white turbidity state or vice/versa depending on temperature, on a support. In addition, this material has a cushion member having a cushion layer which contains dye or pigment on the support side. Especially the cushion layer is one which is obtained by thermally foaming a layer containing a foamable plastic filler. Further, a non- contact part containing an air inside is provided between the thermal recording member and the cushion layer.

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 capable of repeatedly forming and erasing an image by utilizing reversible transparency change with temperature of a thermosensitive layer.

[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. 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).

When an image is formed with a heating element such as a thermal head in such a reversible thermosensitive recording material, if the pressure and energy of the thermal head are low, the white turbidity of the image area is low and the contrast is poor. .. Further, when the pressure and energy of the thermal head are increased, the contrast is improved, but conversely, when image formation and erasing are repeated several times, the surface of the reversible thermosensitive recording material becomes scratched, and further scratches on the surface adhere to the thermal head. There is a drawback that image sticking occurs due to adhesion of head residue.

[0004]

DISCLOSURE OF THE INVENTION The present invention solves the above-mentioned drawbacks, and when an image is formed by a heating element such as a thermal head, a high white turbidity can be obtained even if the pressure or thermal energy of the thermal head is low. An object of the present invention is to provide a reversible heat-sensitive recording material which can form an image and can prevent surface scratches and head residue adhesion due to pressure or energy of a thermal head.

[0005]

According to the present invention, a resin base material and an organic low molecular weight substance dispersed in the resin base material are contained as a main component on a support, and a transparent state and a cloudiness are obtained depending on temperature. In a reversible thermosensitive recording material provided with a thermosensitive layer whose state changes reversibly, a thermosensitive layer is provided on a support, the support side of a thermosensitive recording layer member, and a cushion layer containing a dye or a pigment on the support. A reversible heat-sensitive recording material characterized in that the cushion layer side of a cushion member provided with is adhered, in particular, the reversible heat-sensitive recording material characterized in that the cushion layer contains a foamable plastic filler, Further, there is provided a reversible thermosensitive recording material characterized in that a non-adhesive portion having air inside is provided between the cushion layer and the thermosensitive recording layer member.

The present inventors have conducted extensive studies in view of the present situation, and as a result, in a reversible thermosensitive recording material,
When a cushion layer made of plastic foam or a cushion layer formed by heat-foaming a foamable plastic filler is provided, and a reversible heat-sensitive recording material is stuck on the cushion layer, the cushion layer is formed from the thermal head by the cushioning action and the heat insulating action. Thermal energy can be effectively absorbed in the heat-sensitive recording layer, and as a result, an image with high white turbidity can be obtained even at low energy and low pressure, and at the same time, scratches on the surface and adhesion of head residue can be prevented, and on the cushion layer When pasting with the support side of the thermal recording member,
When a non-adhesive portion having air inside is provided between the cushion layer and the heat-sensitive layer member, the non-adhesive portion causes total reflection of light to improve image contrast, and the cushion layer is colored. It was found that the white turbidity became clearer due to the difference in color density and the image contrast was improved.

The cushion member of the present invention comprises a support provided with a cushion layer containing a dye or a pigment. Examples of the cushion layer material include polyurethane foam, polystyrene foam, polyvinyl chloride foam, plastic corrugate, and foamable plastic filler mixed with a binder and heated and foamed.

The expandable plastic filler used in the present invention is a hollow plastic filler containing a thermoplastic resin as a shell and a low boiling point solvent and a foaming agent inside, and is foamed by heating. Such foamable plastic filler is conventionally known, and various types can be used. Regarding the particle size, in the unfoamed state,
2 to 50 μm, preferably 5 to 20 μm, and 10 to 100 μm, preferably 10 to 50 μm in a foamed state.
μm. Examples of the thermoplastic resin serving as the shell of the plastic filler include polystyrene, polyvinylidene chloride,
Examples thereof include polyvinyl acetate, polyacrylic acid ester, polyacrylonitrile, polybutadiene, and copolymers thereof. As the foaming agent contained in the shell,
Generally, propane and butane are used.

The dyes and pigments contained in the cushion layer of the present invention include carbon black, titanium dioxide, red iron oxide, lake red C, fast sky blue, benzidine yellow, phthalocyanine green, direct dyes, oil dyes and basic dyes. Examples include pigments and dyes.

Examples of the support constituting the cushion member of the present invention include paper, synthetic paper, plastic film, glass plate, magnetic base, metal plate and the like.

To form a cushion member by providing a cushion layer on a support, a plastic foam raw material or the above-mentioned expandable plastic filler is applied and dried on a support together with a binder, and a hot plate is adhered to the applied surface. Then, the plastic foam raw material or the expandable plastic filler may be heated and foamed. Since the surface of the cushion layer formed on the support has considerable unevenness, it is necessary to smooth it by calendering.

As such a binder, various conventional binders can be appropriately used, and examples thereof include polyvinyl alcohol, starch and its derivatives, methoxycellulose, and the like.
Cellulose derivatives such as hydroxyethyl cellulose, carboxymethyl cellulose, methyl cellulose, ethyl cellulose, sodium polyacrylate, polyvinylpyrrolidone, acrylic acid amide / acrylic acid ester copolymer, acrylic acid amide / acrylic acid ester / methacrylic acid terpolymer, Styrene / maleic anhydride copolymer alkali salt, inbutylene / maleic anhydride copolymer alkali salt, polyacrylamide, sodium alginate,
Water-soluble polymers such as gelatin and casein, polyvinyl acetate, polyurethane, styrene / butadiene copolymer,
Polyacrylic acid, polyacrylic acid ester, vinyl chloride / vinyl acetate copolymer, polybutyl methacrylate, ethylene / vinyl acetate copolymer, styrene / butadiene /
A latex such as an acrylic copolymer can be used.

The content of the colorant is 1 to 20 parts by weight, preferably 5 to 15 parts by weight, based on 100 parts by weight of the binder.

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, (i) in the case of transparency, the particles of the organic low-molecular substance dispersed in the resin matrix 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 appears to be transparent because it is transmitted to the side, and (ii) in the case of 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 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 crystal of the organic low molecular weight 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 conceivable that the organic low-molecular-weight substance undergoes a semi-molten state until the following and the crystal grows from a polycrystal to a single crystal.
Further heating to a temperature of T ₃ or higher results in a semitransparent state between the maximum transparency and the maximum opacity. 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 is melted at a temperature of T ₃ or higher and is then cooled to precipitate polycrystals. It should be noted that 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 when heated again 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 or a transparent image on a cloudy background, and the change can be repeated many times. By arranging a coloring sheet on the back surface of such a heat sensitive member, 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. 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 increases because two thermal heads are required, but if the reversible heat-sensitive recording material is passed once with different energy application conditions for each thermal head, image formation and erasure can be performed. You can do it. In the latter case, an image is formed and erased by one thermal head. Therefore, the conditions for applying energy to the thermal head at one time when the thermal recording material passes are adjusted according to the image forming portion and the erasing portion. The operation is complicated, but the operation is complicated, such as changing finely, or once erasing the image on the thermosensitive recording material and then running the thermosensitive recording material in the reverse direction again to form an image under different energy conditions. Therefore, the equipment cost is reduced.

The heat-sensitive recording layer member of the present invention can be produced by, for example, forming the heat-sensitive layer as a film on the support or molding it into a sheet by the following method. 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) Dissolve the resin base material in a solvent that dissolves only the resin base material, pulverize or disperse the organic low molecular weight substance in the solvent by various methods, apply this to a support member, evaporate the solvent, and form a film. Or the method of making a sheet. The solvent for forming the heat-sensitive layer can be variously selected depending on the types 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, benzene and the like. The organic low-molecular substance is precipitated as fine particles in the heat-sensitive layer obtained not only when using the dispersion but also when using the solution,
Exists in a distributed state.

Then, the support side of the obtained heat-sensitive recording layer member and the cushion layer side of the cushion member are adhered with a conventional adhesive or pressure-sensitive adhesive as described above, and the reversible heat-sensitive material of the present invention is attached. Recording materials can be manufactured. At this time, a non-adhesive portion having an air layer inside can be provided by providing a desired portion with no adhesive coating.

In the present invention, the resin used as the resin base material of the thermosensitive layer of the reversible thermosensitive recording material is preferably a resin which can form a film or a sheet, has good transparency and is mechanically stable. 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-acrylate copolymer. Vinyl chloride-based copolymers such as polymers; polyvinylidene chloride, vinylidene chloride-vinyl chloride copolymers, vinylidene chloride-based copolymers such as vinylidene chloride-acrylonitrile copolymers; polyesters; polyamides; polyacrylates or polymethacrylates or acrylates -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 that changes from polycrystal to single crystal in the recording layer due to heat (changes within the temperature range of T _{1 to} T ₃ shown in FIG. 1) may be used.
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; 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 admixture of two or more. The carbon number of these compounds is 10
60, preferably 10-38, particularly 10-30 are preferred. The alcohol group portion 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 of oxygen, nitrogen, sulfur and halogen in the molecule, for example, -OH, -COOH, -CONH, -COOR, -N.
_{H, -NH 2, -S -,} - S-S -, - O-, is preferably a compound containing a halogen and the like.

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

In order to broaden the temperature range in which the material can be made transparent, the organic low molecular weight substances described in this specification are appropriately combined, or such an organic low molecular weight substance is combined with another material having a different melting point. Just combine them. These are disclosed, for example, in JP-A-63-39378 and JP-A-63-1303.
No. 80, etc., and Japanese Patent Application No. 63-14754, Japanese Patent Application No. 1-140109, etc., but the invention is not limited thereto.

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: 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, and when it exceeds the ratio, the amount of the organic low molecular weight substance is small, so that it becomes opaque. Becomes difficult.

The thickness of the heat sensitive layer is preferably 1 to 3 μm, and 2
˜20 μm is more preferred. 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 salt of phosphoric acid mono- or di-ester; low degree of sulfated oil; poly long chain alkyl acrylate; acrylic orgomer; poly long chain alkyl methacrylate; long chain alkyl methacrylate to amine-containing mono Chromatography copolymers; styrene-maleic anhydride copolymer; olefin-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 No. 64-14079).

Further, a protective layer may be provided on the heat-sensitive layer of the present invention in order to protect the heat-sensitive layer as in the case of the conventional reversible heat-sensitive recording material. A suitable thickness of the protective layer is about 0.1 to 5 μm. Materials for the protective layer laminated on the heat-sensitive layer include silicone rubber and silicone resin (JP-A-63-22).
No. 1087), a polysiloxane graft polymer (described in Japanese Patent Application No. 62-152550), an ultraviolet curable resin or an electron beam curable resin (Japanese Patent Application No. 63-310600).
No.) 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 the resin of the heat-sensitive layer and the organic low molecular weight substance are difficult to dissolve, n
-Hexane, methyl alcohol, ethyl alcohol, isopropyl alcohol and the like can be mentioned, and an alcohol solvent is particularly preferable in terms 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.

[0030]

EXAMPLES All parts and percentages herein are by weight. The present invention is not limited to this.

Example 1 A mixture having the following composition was stirred and dispersed by a disper and a ball mill to prepare a cushion layer coating solution. Polyurethane foam 15 parts 10% Polyvinyl alcohol 30 parts Carbon black 3 parts Water 52 parts The above cushion layer coating liquid has a dry adhesion amount of 2.0 to 3.0 g on the surface of a transparent polyester film (88 μm thick).
The / m ² was applied and dried such that the surface created calendering process smoothes and cushioning layer member. On the other hand, a reversible thermosensitive recording layer coating solution having the following composition was prepared. Stearic acid 6 parts Eicosane diacid 4 parts VYHH 30 parts Diisodecyl phthalate 3 parts THF 18 parts Toluene 2 parts The above reversible thermosensitive recording layer coating solution has a dry adhesion amount of 15.0 g / m on the surface of a polyester film (50 μm thick). ²
Was applied and dried to form a heat-generating layer. Further thereon, a solution consisting of 10 parts of polyamide resin (manufactured by Toray Industries: CM8000) and 90 parts of methanol was applied by a wire bar and dried by heating to form an intermediate layer having a thickness of about 1 μm. Furthermore, 10 parts of a urethane acrylate-based UV curable resin 75% butyl acetate solution (Dainippon Ink and Chemicals, Unidick C7-157) 10 parts toluene solution was applied with a wire bar and heated and dried. 80
A reversible thermosensitive recording member was prepared by curing with a w / cm ultraviolet lamp and providing an overcoat layer having a thickness of about 2 μm. Next, the surface of the cushion layer member and the back surface of the reversible thermosensitive recording member were bonded together with an adhesive to prepare a reversible thermosensitive recording material of the present invention.

Example 2 In the cushion layer member of Example 1, instead of the polyurethane foam, a foamable plastic filler (shell: copolymer of vinylidene chloride and acrylonitrile, foaming agent: isobutane) was replaced, and the coated surface was heated. To the surface of a rotary drum dryer having a
It was foamed by heating at 130 ° C. for about 2 minutes. After that, the surface was calendered and smoothed to form a cushion layer member. A reversible thermosensitive recording material of the present invention was prepared in the same manner as in Example 1 except for the above.

Example 3 Example 2 was repeated except that when the cushion layer member of Example 2 and the reversible thermosensitive recording member were laminated, no adhesive was applied to the display section and a non-adhesive section containing air was formed inside. A reversible thermosensitive recording material of the present invention was prepared in the same manner as in.

Comparative Example 1 A comparative reversible thermosensitive recording material was prepared in the same manner as in Example 2 except that the reversible thermosensitive recording layer coating liquid was applied onto the cushion layer member of Example 2.

Comparative Example 2 A comparative reversible thermosensitive recording material was prepared in the same manner as in Example 1 except that the cushion layer member of Example 1 was omitted.

The reversible thermosensitive recording materials obtained in Examples 1 to 3 and Comparative Examples 1 to 2 were evaluated using a thermal head printing tester manufactured by Hashiro Electric Co. As the thermal head, a thermal head of 8 dots / mm manufactured by Ricoh Co., Ltd. was used, and a test was carried out in full solid printing under the conditions of a platen pressure of 1.0 kg, a pulse width of 1 ms and a voltage of 10V to 25V.
The density was measured with a Macbeth reflection densitometer (RD-514), and image breakage due to adhesion of dust to the thermal head and surface scratches were visually determined. The results are shown in Table 1 and FIG.

[0037]

[Table 1]

[0038]

As is apparent from the description of Examples and Comparative Examples, the reversible thermosensitive recording material of the present invention is provided with a cushion layer on the support side and the reversible thermosensitive recording layer is provided on the surface thereof, so that the energy consumption is low. Since images can be formed and erased, the surface of the reversible thermosensitive recording material is less likely to be scratched even if the image formation and deletion are repeated, and the thermal head has less dust adhesion. Further, there is an effect that the white turbidity is not significantly reduced even if the image formation to the erasing are repeated. Further, when the reversible thermosensitive recording layer member and the cushion member are attached to each other, if a non-adhesive portion having air inside is interposed between the cushion layer and the reversible thermosensitive recording member, the contrast of the white turbidity is caused by the total reflection effect of light. Has the effect of improving.

[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 diagram comparing thermal sensitivities of reversible thermosensitive recording materials of Examples 1 to 3 and Comparative Examples 1 and 2.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Makoto Kawaguchi 1-3-6 Nakamagome, Ota-ku, Tokyo Inside Ricoh Co., Ltd. (72) Inventor Kunichika Moroboshi 1-3-6 Nakamagome, Ota-ku, Tokyo In Ricoh Co., Ltd. (72) Fumito Masuchibuchi 1-3-6 Nakamagome, Ota-ku, Tokyo In Ricoh Co., Ltd.

Claims (3)

[Claims] 1. A thermosensitive layer comprising a resin base material and an organic low-molecular substance dispersed in the resin base material as a main component on a support, and a transparent state and a cloudy state reversibly change depending on temperature. In the reversible thermosensitive recording material provided with, a support side of a thermosensitive recording layer member having a thermosensitive layer provided on a support, and a cushion layer side of a cushion member provided with a cushion layer containing a dye or a pigment on the support. A reversible heat-sensitive recording material characterized by being attached. 2. The reversible thermosensitive recording material according to claim 1, wherein the cushion layer contains a foamable plastic filler. 3. The reversible thermosensitive recording material according to claim 1, wherein a non-adhesive portion having air inside is provided between the cushion layer and the thermosensitive recording layer member.