JP2831482B2 - Reversible thermosensitive recording sheet - Google Patents

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 sheet capable of recording and erasing information reversibly by heating, for example, a rewritable thermosensitive display.

[0002]

2. Description of the Related Art Hitherto, as a composition of a recording layer capable of recording and erasing information reversibly, many photochromic materials which emit and decolor by irradiation with light, such as spiropyran compounds, have been studied. However, in the case of this material, there is a problem in stability against light and heat and durability against repeated use, so that it has not been put to practical use.

On the other hand, as a material which is light-resistant and can be used repeatedly, a polymer composition which reversibly records and displays information by thermally changing the transparency and opacity of a recording layer is, for example, a special feature. It is disclosed in Japanese Patent Laid-Open No. 54-119377. This composition is a composite composition in which a crystalline organic compound having a relatively low molecular weight is dispersed in the form of particles in a matrix polymer.
It can be made cloudy and opaque, and it is possible to perform reversible recording. In each state, light transmission and scattering occur depending on the crystal size, corresponding to the single crystal state and the polycrystalline state of the organic compound in the particles. As one of the configuration when using,
It may be used in the form of a sheet formed by coating a recording layer on a support sheet and a card formed by punching the sheet.

FIG. 4 shows a conventional basic configuration. In the conventional configuration shown in FIG. 4, a reversible thermosensitive recording layer 2 is formed on a support sheet 4 by coating, and a protective layer 9 is formed on the reversible thermosensitive recording layer 2 by coating.

[0005] Writing and erasing of information on the thermosensitive reversible recording sheet is usually performed by a thermal head. Due to repetition of heating or recording or erasing by heating with a thermal head, physical deterioration due to damage of the recording layer and deterioration in thermal characteristics of the head due to adhesion of the recording layer composition,
A protective layer is formed on the recording layer by coating and used. The protective layer requires mechanical strength and flexibility in addition to thermal stability, and transparency is required as an optical property in order to read the information of the recording layer well. As the protective layer, cellulosic resin, styrene resin or styrene copolymer resin, acrylic resin or methacrylic resin or a copolymer resin thereof, polyester resin, butyral resin, polyvinyl chloride resin, polyvinyl acetate resin, vinyl chloride / vinyl acetate A copolymer resin, a polyurethane resin, an acrylate-based radiation curable resin, or the like is used after being further coated on the recording layer coated on the support sheet.

[0006]

However, in the above prior art, although the protective layer coated with a resin has a resistance of the protective layer itself against mechanical and physical deterioration such as damage, heating of recording / erasing by a thermal head. When the recording layer matrix polymer generated by repeating this process is subjected to thermal stress such as heat shrinkage, the surface of the protective layer is deformed and optically irregularly reflected, disappears faintly and deteriorates the recording state. there were.

The present invention provides a reversible thermosensitive recording sheet capable of maintaining a reversible thermosensitive recording state even when heating for recording and erasing is repeated by a thermal head in order to solve the problems of the prior art. The purpose is to do.

[0008]

To achieve the above object, a reversible thermosensitive recording sheet of the present invention comprises a polymer composition in which organic crystal particles are dispersed in a matrix polymer,
A reversible thermosensitive recording sheet having a recording layer in which the transparency changes reversibly by melting and solidifying the organic crystal particles,
It is provided that a support sheet is provided on the recording sheet having the recording layer formed on the surface of the abrasion-resistant transparent sheet, and that the support sheet and the recording layer are bonded and integrated via an adhesive layer. Features.

In the construction of the present invention, the wear-resistant transparent sheet is made of polyethylene terephthalate, fluorine-containing polymer, polysulfone, polyethylene naphthalate,
The sheet is preferably at least one type of sheet selected from polyphenylene sulfide, polyarylate, polyimide, and polyamide.

[0010] In the construction of the present invention, the bonding and integrating means is laminated via an adhesive previously coated on the surface of the support sheet or the surface of the recording layer.
It is preferable to have.

In the structure of the present invention, it is preferable that a reflection layer for obtaining a contrast of the recording layer is formed on the surface of the support sheet or the surface of the recording layer. Further, in the configuration of the present invention, the support sheet having a reflective layer formed on the surface may be such that the reflective layer is directly coated on the support sheet or the thin reflective sheet having the reflective layer may be formed on the support sheet. It is preferable to be laminated through an adhesive layer.

Further, in the above structure, it is preferable that the reflection layer is subjected to a coupling treatment with a silane coupling agent.

[0013]

According to the structure of the present invention, unlike the case where the recording layer is coated, the thin transparent sheet is a protective layer, and therefore has a strong thermal and mechanical function similarly to the support. The transparent sheet is hardly deformed under the influence of thermal stress such as heat shrinkage when the recording layer matrix polymer is heated by the thermal head. As a result, the recording state is unlikely to be degraded due to repeated heating of recording / erasing. Furthermore, it has abrasion resistance, is less susceptible to mechanical damage by a thermal head, and can achieve reversible thermosensitive recording with good repetition characteristics. Further, since the support sheet and the recording layer are bonded and integrated, the durability is excellent.

Next, the wear-resistant transparent sheet is made of polyethylene terephthalate, fluorine-containing polymer, polysulfone,
According to a preferred example of the present invention, which is at least one type of sheet selected from polyethylene naphthalate, polyphenylene sulfide, polyarylate, polyimide, and polyamide, the durability is further improved because a tough sheet is used. Can be.

Next, according to a preferred embodiment of the present invention that integrally bonded means is by pre substrate sheet of the surface or coated on the surface of the recording layer adhesive,
Integration is easy and high quality can be achieved.
As another means of bonding and integration, for example, a binder such as an epoxy resin may be present in the recording layer and bonded and integrated with the support film.

Next, a preferred embodiment of the present invention wherein a reflective layer is formed on the surface of the support sheet or the surface of the recording layer.
According to the example , the contrast of the recording layer can be improved.

Next, a support sheet having a reflective layer formed on the surface is coated directly with the reflective layer on the support sheet, or a thin reflective sheet having the reflective layer is bonded to the support sheet with an adhesive layer. According to a preferred embodiment of the present invention that formed by laminating through, it is possible to improve the contrast of the same recording layer.

Furthermore, according to a preferred embodiment of the present invention that the reflective layer is formed by coupling treatment by a silane coupling agent, it can improve the adhesion of the reflective layer surface.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS First, the basic configuration of the present invention will be described with reference to the drawings.

The basic structure of the present invention is shown in FIGS. 1 and 2, respectively. FIG. 1 shows a transparent sheet supporting a reversible thermosensitive recording layer 2.
1. A recording sheet 10 formed by coating the recording layer 2 on the substrate 1 and a support sheet 4 were laminated via an adhesive layer 3 so that the surface of the recording layer 2 and the surface of the support sheet 4 were fitted. Things. FIG. 2 shows a configuration in which a reflection layer 5 for improving the contrast of the recording layer 2 is formed on the support sheet 4 in the above-described configuration, and the support sheet 4 and the transparent sheet 6 supporting the reflection layer 5 are provided. Are laminated via an adhesive layer 7 .

Next, the principle of the reversible thermosensitive recording used in the present invention will be described with reference to FIG. This thermosensitive recording layer is in a cloudy and opaque state at a normal temperature of T ₀ or less. Heat to T _{1 to} T
_It becomes transparent when the temperature is in the range of ₂ , and maintains its transparent state even when it is returned to room temperature. Also when heated to T ₃ or more temperature range, the process proceeds to a semi-transparent state, returns to the opaque state that becomes cloudy and returning from this state to room temperature. Using the difference in transparency due to the difference in the heating temperature range, it is possible to perform reversible thermosensitive recording using the transparency and opaque state as information.

The components will be described below.

The material of the support sheet 4 is selected in consideration of conditions such as strength and rigidity. Nylon, cellulose acetate resin, polystyrene, polyethylene,
Plastics such as polypropylene, polyester, polyimide, polycarbonate, and polyvinyl chloride are used alone or in combination, but polyester and polyvinyl chloride are practical as a support. Further, the sheet structure needs to have a sufficient thickness to hold the sheet structure by mechanical strength. The thickness is often used in the range of about 0.005 to 5 mm. Further, even if the support sheet 4 is transparent,
Can be used in opaque, fully or partially colored
You may. Further, as the support sheet 4 , an information recording layer such as a magnetic recording layer may be formed by a method other than thermal recording.

Support sheet4Reflective layer formed on5
Is the reversible thermosensitive recording layer2Improves the contrast of recording conditions
High reflectance in the visible light region as a metal
Al, Au, Te, etc. showing direct or binder tree
It is used by being dispersed in a fat material. Also has metallic luster
Organic thin films such as methine dyes and xanthene dyes
Can be used. This reflective layer is directly supported on the support sheet
Dry manufacturing methods such as vacuum evaporation and sputtering
And wet manufacturing methods such as casting and plating.
Is coated. Or, the support sheet4
Forming material, reflective layer5And strength that can support
Thin sheet with properties such as rigidity6Above, reflective layer5To
Reflective sheet formed by coating11The adhesive layer7To
Through the support sheet4Above, reflective layer5So that it comes to the surface
And formed. In addition, the reflective layer5Support
Sheet6Is transparent, the reflective layer comes to the bonding surface
The effect is the same even if they are laminated as described above.

When a silane coupling agent is used to improve the adhesiveness on the surface of the reflective layer when laminating via the adhesive layer, the adhesive effect is improved. A general formula of a silane coupling agent that can be used is shown in (Chemical Formula 1).

[0026]

Embedded image

In the above formula (1), Y is a functional group which reacts with the adhesive layer, an amino group, a vinyl group, an epoxy group, a mercapto group, a chloro group or the like, or a lipophilic methyl group. n is the number of methylene chains, where n = 0 to about 30. R is an inert group, such as a methyl group or an ethyl group. X is a functional group that reacts with the reflective layer by hydrolysis to cause chemical adsorption, and is a methoxy group,
An ethoxy group, a chloro group or the like is used, and m is 1 ≦ m ≦ 3
It is.

As the thin transparent sheet 1 supporting the reversible thermosensitive recording layer 2 used in the recording sheet 10 , a resin material applicable to the support sheet 4 can be used. The condition of the material needs to be optically transparent in order to reproduce the information of the recording layer 2 well. Further, the thickness of the sheet 1 needs to be sufficient to transmit heat to the recording layer 2 when recording and erasing by the thermal head.
About 01 to 0.05 mm is suitable. This recording layer 2
Examples of the material of the transparent sheet 1 for supporting polyethylene terephthalate, fluorine-containing polymer, polysulfone, polyethylene naphthalate, polyphenylene sulfide,
Polyarylate, polyimide and polyamide are preferably used.

As the matrix polymer constituting the recording layer 2 composed of the polymer composition for performing the reversible thermosensitive recording, the organic crystalline low molecular compound is uniformly dispersed in the form of particles and is maintained in a transparent state. Must have transparency.
Therefore, those having good film-forming properties, excellent mechanical stability, and optically transparent properties are preferred. As such resins, polyvinyl chloride, polyvinyl acetate, polyvinylidene chloride, vinyl chloride / vinyl acetate copolymer resin, vinyl chloride / vinyl acetate / vinyl alcohol copolymer resin, vinyl chloride / vinyl acetate / maleic acid copolymer resin , Vinyl chloride /
Acrylate copolymer resin, vinyl chloride / vinylidene chloride copolymer resin, vinylidene chloride / acrylonitrile copolymer resin, polyester resin, polyamide resin, polyacryl resin, polymethacryl resin, acrylic / methacryl copolymer resin, silicone resin, nylon resin, Butyral resin, styrene / butadiene copolymer resin and the like can be applied. These resins may be used alone or in combination of two or more.

The organic crystalline particles constituting the reversible thermosensitive recording layer 2 are dispersed in a matrix polymer as shown in FIG.
The compound has the following temperature characteristics. Depending on its selection, a transparentization temperature range and an opacity temperature range are selected. The melting point of the compound is preferably from 30 ° C. to 200 ° C., particularly preferably from 50 ° C. to 150 ° C. in consideration of the thermal characteristics of the thermal head and the thermal properties of the matrix polymer material. Considering the ease of crystallization, the organic compound constituting the organic crystalline particles is preferably a compound containing at least one heteroatom, oxygen, nitrogen, sulfur, halogen, or the like in the molecule. For example, -O-, -OH, -COOH, -CON
H -, - COOR, -CO - , - NH -, - NH 2 -,
-S-, -SH, -S-S-, a compound containing halogen, etc., alkanol, alkanediol, alkylamine, alkylammonium salt, alkane, alkene,
Alkynes, cycloalkanes, cycloalkenes or alkynes, saturated or unsaturated mono- or dicarboxylic acids, or esters, amides of these mono- or dicarboxylic acids,
Or an ammonium salt, an aromatic carboxylic acid or an ester, an amide, or an ammonium salt thereof, a thioalcohol, a thiocarboxylic acid or an ester, an amide, or an ammonium salt thereof, a carboxylic acid ester of a thioalcohol, or a halide of these compounds. No. These compounds are used alone or in combination of two or more. Further, the carbon number of these compounds is 10 to 60, preferably 10 to 38, and particularly preferably 10 to 30.

Specific compounds include higher fatty acids such as lauric acid, dodecanoic acid, myristic acid, pentadecanoic acid, palmitic acid, heptadecanoic acid, stearic acid, nonadecanoic acid, arachiic acid, behenic acid and oleic acid. Alcohols include hexadecyl alcohol, heptadecyl alcohol, octadecyl alcohol, eicosanol, docosanol and the like. Higher fatty acid esters include methyl stearate, ethyl stearate, tetradecyl stearate, octadecyl stearate,
Octadecyl laurate, tetradecyl palmitate,
Examples thereof include methyl arachiate and docosyl behenate, and examples of ether or thioether include didodecyl ether, didodecyl thioether, and octadecyl thioether.

The composition ratio between the compound of the organic crystalline particles constituting the reversible thermosensitive recording layer 2 and the matrix polymer is as follows:
A weight ratio in the range of 1: 0.5 to 1:20 is desirable. If the ratio of the matrix polymer is less than this, the amount of the compound of the organic crystalline particles increases, and it becomes difficult to form a uniform coating as the recording layer. Conversely, when the ratio of the matrix polymer increases, the amount of the organic crystalline particles decreases, so that opacity is difficult and the contrast of information deteriorates.

The adhesive layer 3 or 7 used when laminating the support sheet 4 and the recording sheet 10 via the adhesive layer 3 or laminating the support sheet 4 and the reflective sheet 11 via the adhesive layer 7 is used. Thermoplastic resins such as phenol resins and epoxy resins, thermoplastic resins such as polyamide resins, polyurethane resins, vinyl chloride / vinyl acetate copolymer resins and butyral resins, and elastomer adhesives such as butadiene acrylonitrile rubber can be used. These adhesives are previously applied to the surface of the recording layer 2 or the reflective layer 5
After coating on the surface or the surface of the support sheet 4 , the respective sheets are stacked and laminated, respectively, to form a reversible thermosensitive recording sheet. In addition, ten to maintain the seat configuration
Even a good adhesive strength is obtained, which affects the readability of recorded information
If not , the thickness of the adhesive layer 3 or 7 is not limited,
As the wearing surface, not only the entire surface but also partial adhesion may be used.
No. Next, the present invention will be described in more detail using examples.

Example 1 As a thick support sheet 4, a 200 μm thick white polyethylene terephthalate sheet having a magnetic recording layer having a dark brown color of γ-Fe ₂ O _{3 on} the surface was used. Also,
15 μm thick as a thin transparent sheet 1 with abrasion resistance
Polyethylene terephthalate film was used.

The production of the recording sheet 10 will be described. After uniformly dissolving 2 g of behenic acid as a compound of organic crystal particles, 0.1 g of a phenolic antioxidant as an antioxidant, and 8 g of a vinyl chloride / vinyl acetate copolymer as a matrix polymer in 100 ml of tetrahydrofuran, a transparent sheet 1 was prepared. A recording layer 2 was coated thereon with a thickness of 12 μm to form a recording sheet 10.

The surface of the recording layer 2 of the recording sheet 10 was coated as a bonding layer 3 with a polyester resin adhesive having a thickness of about 5 μm. Thereafter, the magnetic recording layer surface of the support sheet 4 and the recording layer 2 surface of the recording sheet 2 were laminated and laminated so as to fit each other to form a reversible thermosensitive recording sheet having the structure shown in FIG. The clearing temperature range of this reversible thermosensitive recording sheet was about 70 ° C to 80 ° C. Therefore, recording is performed on the reversible thermosensitive recording sheet, which has been initially made transparent, by adjusting the head energy of the thermal head to 85 ° C. on the recording layer surface to make the recording layer cloudy and opaque. Further, the head energy is adjusted to 75 ° C., and the opaque and opaque recording portion is made transparent to perform erasing.

As a result of recording the alphabet as character information on this reversible thermosensitive recording sheet, white letters could be displayed on the dark brown surface of the magnetic recording layer, and 26 letters of the alphabet could be recognized well. As a result of repeating recording / erasing of the character display, 3,000 or more repetitions could be stably performed. In addition, the surface of the transparent sheet 1 in contact with the thermal head did not show any disappearance due to thermal or mechanical damage.

Comparative Example 1 As a thick support sheet 4, a 200 μm thick white polyethylene terephthalate sheet having a magnetic recording layer having a dark brown color of γ-Fe ₂ O _{3 on} the surface was used. On this support sheet 4, a recording layer 2 was formed by coating with the same composition as in Example 1. 2 g of behenic acid as a compound of organic crystal particles, 0.1 g of a phenolic antioxidant as an antioxidant, 8 g of a vinyl chloride / vinyl acetate copolymer as a matrix polymer, 100 m of tetrahydrofuran
1 and then coated with a thickness of 12 μm. Further, the surface of the recording layer 2 was coated with a UV-curable acrylic resin prepolymer of 20 μm as a protective layer 9 and then irradiated with ultraviolet rays to obtain a reversible thermosensitive recording sheet having the configuration shown in FIG.

As a result of repeating recording and erasing of alphabetical character display on the reversible thermosensitive recording sheet, 1000
Although the repetition could be performed more than once, characters disappeared and remained white on the surface of the protective layer. This is irregular reflection due to mechanical abrasion by the thermal head or irregular reflection due to surface distortion due to thermal shrinkage of the recording layer itself or the protective layer due to thermal stress of the recording layer.

Example 2 A 180 μm thick white polyethylene terephthalate sheet was used as the thick support sheet 4, and a 15 μm thick polyethylene terephthalate film was used as the abrasion-resistant thin transparent sheet 1 and the reflective layer support sheet 6. Was.

The production of the recording sheet 10 will be described. 2 g of behenic acid and 0.3 g of stearic acid as compounds of organic crystal particles
And 0.2 g of docosanoyl alcohol, 0.1 g of a phenolic antioxidant as an antioxidant, and 10 g of a vinyl chloride / vinyl acetate / acrylamide copolymer as a matrix polymer are uniformly dissolved in 100 ml of tetrahydrofuran. A recording layer 2 having a thickness of 1
The recording sheet 10 was formed by coating at 2 μm.

Next, the production of the reflection sheet 11 will be described. A reflective layer 5 of metallic aluminum was formed on the reflective layer support sheet 6 by a vacuum evaporation method to a thickness of 0.2 μm. further,
The silane coupling agent of γ-glycidoxypropyltrimethoxysilane was adsorbed on the aluminum reflective layer as a monomolecular layer from isopropyl alcohol to improve the adhesiveness with the adhesive layer.

The surface of the reflection layer support sheet 6 of the reflection sheet 11 was coated as an adhesive layer 7 with an epoxy resin adhesive of about 5 μm. Thereafter, the adhesive layer 7 on the reflection sheet 11 was laminated on the support sheet 4. Further, an epoxy resin adhesive is applied as an adhesive layer 3 to a thickness of about 5 μm on the reflective layer 5 which has been treated with a silane coupling agent.
After coating, the surface of the recording layer 2 of the recording sheet 10 is laminated and laminated so as to match the adhesive layer 3,
A reversible thermosensitive recording sheet having the configuration shown in FIG. 2 was formed. The clearing temperature range of this reversible thermosensitive recording sheet is from about 70 ° C to 90 ° C.
° C. Therefore, recording is performed on the reversible thermosensitive recording sheet, which has been initially made transparent, by adjusting the head energy of the thermal head to 95 ° C. on the recording layer surface to make the recording layer cloudy and opaque. Further, the head energy is adjusted to 75 ° C., and the opaque and opaque recording portion is made transparent to perform erasing.

This reversible thermosensitive recording sheet was set to 54 mm × 86
mm, and the repetition of recording / erasing of reversible thermosensitive recording was evaluated using a card reader / writer equipped with a thermal head. I didn't see it.

Example 3 As a thick support sheet 4, a polyvinyl chloride sheet having a magnetic stripe and a thickness of 700 μm was used. A thin transparent sheet 1 having a thickness of 10
A poly (pyromellit-diphenyl ether) imide film having a thickness of 15 μm was used, and a polyethylene terephthalate film having a thickness of 15 μm was used as a reflection layer support sheet 6.

The production of the recording sheet 10 will be described. 2 g of behenic acid and 0.2 g of stearic acid as compounds of organic crystal particles
Then, 0.2 g of arachidic acid and 10 g of a vinyl chloride / vinyl acetate copolymer as a matrix polymer were uniformly dissolved in 100 ml of tetrahydrofuran, and then coated on a transparent sheet 1 as a recording layer 2 with a thickness of 15 μm. 10 was formed. This recording sheet has the yellow color of the polyimide sheet.

Next, the production of the reflection sheet 11 will be described. A reflective layer 5 of metallic aluminum was formed on the reflective layer support sheet 6 by a vacuum evaporation method to a thickness of 0.2 μm. further,
The silane coupling agent of γ- (2-aminoethyl) aminopropyltrimethoxysilane was adsorbed on the aluminum reflective layer as a monomolecular layer from isopropyl alcohol to improve the adhesiveness with the adhesive layer.

First, the surface of the reflection layer 5 of the reflection sheet 11 treated with the silane coupling agent was coated with an epoxy resin adhesive as an adhesive layer 3 by about 5 μm. Thereafter, the recording sheet 2 was laminated and laminated so that the surface of the recording layer 2 of the recording sheet 10 was fitted with the coated adhesive layer 3. further,
A sheet obtained by laminating the reflection sheet 11 and the recording sheet 10 was laminated on a support sheet via an adhesive layer 7 made of an epoxy resin adhesive to produce a reversible thermosensitive recording sheet. The clearing temperature range of this reversible thermosensitive recording sheet was about 80 ° C to 110 ° C. Therefore, recording is performed on the reversible thermosensitive recording sheet, which has been made transparent at the beginning, by adjusting the head energy of the thermal head to 120 ° C. on the recording layer surface to make the recording layer cloudy and opaque. Further, the head energy is adjusted to 90 ° C., and the opaque and opaque recording portion is made transparent to perform erasing. As a result of evaluating the recording / erasing repetition of the reversible thermosensitive recording, 5,000 or more repetitions could be stably performed, and the transparent sheet in contact with the thermal head did not show any disappearance.

As described above, according to the embodiments of the present invention, in a reversible thermosensitive recording sheet in which the transparency of a recording layer composed of a matrix polymer in which organic crystalline particles are dispersed is reversibly changed, the transparent sheet and the recording layer By integrating the support sheet with the recording layer in between,
The erasing repeatability was improved.

[0050]

As described above, the present invention relates to a reversible thermosensitive recording sheet comprising organic crystal particles and a matrix polymer, wherein a recording layer surface of a recording sheet using a thin abrasion-resistant transparent sheet and a support sheet surface. This is a reversible thermosensitive recording sheet obtained by bonding and integrating, and provides highly reliable recording / erasing repetitive characteristics. As described above, the present invention is of great industrial value.

[Brief description of the drawings]

FIG. 1 is a view showing one embodiment of a configuration of a reversible thermosensitive recording sheet according to the present invention.

FIG. 2 is a view showing one embodiment of the configuration of a reversible thermosensitive recording sheet having a reflective layer in the present invention.

FIG. 3 is a diagram illustrating a recording principle of a reversible thermosensitive recording sheet of the present invention.

FIG. 4 shows a configuration of a comparative example of a reversible thermosensitive recording sheet.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Transparent sheet 2 Recording layer 3 Adhesive layer 4 Support sheet 5 Reflective layer 6 Reflective layer support sheet 7 Adhesive layer 8 Silane coupling agent 9 Protective layer 10 Recording sheet 11 Reflective sheet

──────────────────────────────────────────────────続 き Continuation of front page (72) Inventor Taku Hashida 1006 Kazuma Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. (56) References JP-A-62-240587 (JP, A) JP-A-3-3 73383 (JP, A) Hikaru Hei 2-44071 (JP, U) (58) Field surveyed (Int. Cl. ⁶ , DB name) B41M 5/36

Claims (5)

(57) [Claims] 1. A reversible thermosensitive recording sheet comprising a polymer composition comprising organic crystal particles dispersed in a matrix polymer and having a recording layer whose transparency is reversibly changed by melting and coagulation of the organic crystal particles. A support sheet is provided on the recording sheet having the recording layer formed on the surface of the abrasion-resistant transparent sheet, and the support sheet and the recording layer are in contact with each other.
A reversible thermosensitive recording sheet characterized in that it is adhered and integrated via a deposition layer . Wherein integrally bonded means, through the pre-support adhesive coated surface of the surface or the recording layer of the sheet
Reversible thermal recording sheet according to claim 1 comprising laminated with. 3. The reversible thermosensitive recording sheet according to claim 1, wherein a reflection layer for obtaining contrast of the recording layer is formed on the surface of the support sheet or the surface of the recording layer. 4. A support sheet having a reflective layer formed on its surface,
The reversible thermosensitive recording sheet according to claim 3 , wherein the reflective layer is directly coated on the support sheet, or a thin reflective sheet having the reflective layer is laminated on the support sheet via an adhesive layer. . 5. The reversible thermosensitive recording sheet according to claim 3 , wherein the reflection layer is subjected to a coupling treatment with a silane coupling agent.