JPH10217611A - Reversible heat-sensitive recording label, and reversible heat-sensitive recording card - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce a thermal load to a card by a thermal head etc., by a method wherein for a reversible heat-sensitive recording label, the reversible heat-sensitive recording layer contains an organic high molecular binder, a reversible coloring matter, and a developer-decoloring agent represented by the formula. SOLUTION: An organic high molecular binder which is used for a reversible heat-sensitive recording layer, is a general-purpose organic high molecular material such as an acrylic resin and a polyester resin which are dissolved by organic solvents. A reversible coloring matter is a leuco dye such as a crystal violet lactone. A developer-decoloring agent is an amide compound which is obtained by a dehydration condensation of an aliphatic carboxylic acid having a phenolic hydroxyl group, and an aliphatic amine, represented by the formula (in the formula, R<1> is hydrogen atom or a methyl group, R<2> is hydrogen atom or a p-hydroxyphenyl group, (m) is 0 when R<1> is hydrogen atom, is an integer of 0-3 when R<1> is a methyl group, and R<3> is a normal chain-form or a branched- form alkyl group represented by Cn H2n+1 (n=3-22)). A label having this reversible heat-sensitive recording layer is affixed on a card.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat-sensitive recording label in which a dye repeats reversible coloring and decoloring by heat, and a card to which the label is attached.

[0002]

2. Description of the Related Art In recent years, cards have been used in various fields such as IC cards, magnetic cards such as prepaid cards and service point cards, and optical cards. These cards record predetermined information on a magnetic recording layer applied to one side of the card, an integrated circuit provided inside the card, or the like. However, in order to confirm the recorded information, it was necessary to read and display the information with a card reader or the like.

In order to simplify this confirmation operation,
A method of providing a thermosensitive recording layer in a portion other than the information recording portion of a card and writing a visible display image at the time of information recording with a card reader having a printing function has been performed. In this method, information can be confirmed in the visible display image, but if the number of times of recording of information is increased, there is no space for printing the visible display image, or it is necessary to reduce print characters to increase the space for printing. There was such a problem.

In order to solve such a problem, it has been proposed that a reversible thermosensitive recording material capable of repeatedly forming and erasing an image be used as a display means. Research and development related to the project are being actively conducted.

[0005] Such a reversible thermosensitive recording material has been described in (1) JP-A-63-39377.
(2) JP-A-63-41186, (3) JP-A-2-5
No. 66, (4) JP-A-2-1363, (5) JP-A-2
-80289, (6) JP-A-2-81672,
(7) JP-A-2-86491, (8) JP-A-58-1
No. 91190, (9) JP-A-60-193691,
(10) JP-A-62-255482, JP-A-4-144
No. 82, (11) International Publication W090 / 11898, (1
2) JP-A-4-46986, (13) JP-A-4-502
No. 89, (14) JP-A-4-50290, and (15) JP-A-5-92661, etc., disclose the invention.

The contents described in the above (1) to (7) are that an organic low-molecular substance is dispersed in an organic high-molecular binder, and the crystallization and polycrystallization of the organic low-molecular substance are performed by heat. It is characterized by being reversibly performed in a binder by energy. However, the method of forming an image using the clouding phenomenon due to such polycrystallization generally has disadvantages such as insufficient contrast and difficulty in visual discrimination.

Further, the above (8) to (15) relate to a leuco dye, a developer / decolorant which thermally reacts with the leuco dye to cause color development and decoloration, an organic polymer binder and the like. It consists of In general, such a heat-sensitive composition has a high contrast and is easy to visually discriminate.
Further, the color of the image can be arbitrarily selected by changing the type of the leuco dye. However, it was recognized that repetition of printing and erasing reduced printability and erasability, and it was strongly desired to improve repetition durability from a practical viewpoint. Further, in this method, it is impossible to completely switch between the coloring reaction and the decoloring reaction only by controlling the heat energy, and since both reactions occur simultaneously at a certain ratio, sufficient coloring and decoloring cannot be performed. . Further, since the decolorizing action of the basic group also acts on the color-developed portion at room temperature, a phenomenon that the print density of the color-developed portion decreases with time is inevitable.

In view of the above, a card reader having ordinary printing and erasing means can perform high-contrast printing and character erasing, maintain a stable image over time in an environment of daily life, and repeatedly endurance. There has been a strong demand for the development of reversible thermosensitive recording materials having excellent properties.

Further, a base material of an IC card, an ID card, a cash card and the like is made of a vinyl chloride plastic material, but the base material is easily dissolved in a solvent and is relatively thick. It is difficult to continuously apply a coating liquid (using an organic solvent) for forming a heat-sensitive recording layer using a continuous coating machine. In order to avoid this problem, labeling of the heat-sensitive recording layer, that is, providing a reversible heat-sensitive recording layer on one surface of the film-like support substrate, and providing an adhesive layer or an adhesive layer on the other surface. Sheet
Punched in the form of a label, depending on its tackiness or adhesiveness,
It has been considered to produce a card having a reversible visible display by sticking it to a card-like substrate. However, even in a card that can be manufactured in this way, if printing and erasing are repeated, the card may be deformed by heat and pressure during printing and erasing.

[0010]

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above-mentioned problems of the conventional materials and techniques by first providing a visible display portion which can be rewritten on a thick card by labeling. In addition, by using a reversible thermosensitive recording composition having high heat sensitivity and good printing characteristics, the thermal load on the card by a thermal head and the like can be reduced, the printing quality is good, and the repetition durability is good. It is an object of the present invention to provide a reversible thermosensitive recording label which is excellent in image quality and can maintain an image which is stable over time in an environment of daily life, and a card to which the label is attached.

[0011]

The present inventors have conducted various studies on a rewritable reversible thermosensitive recording material and a process using the rewritable thermosensitive recording material. When the amide compound obtained by dehydration condensation of an aliphatic carboxylic acid having a phenolic hydroxyl group and an aliphatic amine, which is represented by the following chemical formula (1), is used as the color developing / decoloring agent used in the product, We found that we could solve the problem.

[0012]

Embedded image

In particular, by attaching a reversible thermosensitive recording label using the color developing / decoloring agent of the present invention to a card, the thermal load on the card during printing / erasing can be reduced. The effect is as follows.

That is, in the heat-sensitive recording layer using the color developing / decoloring agent of the present invention, printed characters can be erased by heating at 80 ° C. to 90 ° C. for 0.1 to several seconds. Also, if this heat-sensitive recording layer is used, clear printing is possible even at low printing energy. A card made of a vinyl chloride plastic material has a softening point of about 70 ° C., and when heated at a high temperature, the card may be deformed by heat. However, in the case of a heat-sensitive recording label using the color developing / decoloring agent of the present invention, the card itself is thermally deformed even if heating for erasing characters (heating at 80 to 90 ° C. for 0.1 to several seconds) is performed. Does not reach temperature.

Further, by adding an inorganic filler to the reversible thermosensitive recording composition, the durability against repetition can be further improved. In particular, when kaolin that has been subjected to a vinylsilane treatment is added, not only the repetition durability is improved but also the time required to reach a saturated print density is short, so that a high color density can be obtained even with a low print energy.

When a filler is added to the heat-sensitive layer, the coating solution for the heat-sensitive layer is colored, so that the obtained heat-sensitive layer is also colored,
Although the print quality may also be reduced, the addition of an amine compound to the heat-sensitive layer can suppress the coloring of the heat-sensitive layer background and provide a heat-sensitive layer with excellent appearance.

As described above, in the present invention,
Use of a combination of an amide compound obtained by the dehydration condensation of an aliphatic carboxylic acid having a phenolic hydroxyl group and an aliphatic amine represented by the above chemical formula (1) with an inorganic filler such as kaolin subjected to a surface treatment. Enables low-energy printing of characters and short-time heating at 80 to 90 ° C for character erasure, reducing the thermal load on the card in repeated use, resulting in repeated durability. Is improved.

Hereinafter, various materials and processes used in the present invention will be described. These are only examples in the present invention, and do not limit the scope of the present invention.

As the support base material for the reversible thermosensitive recording member of the present invention, ordinary paper, polyethylene film, polyester film, polypropylene film, polyvinyl chloride film, polyvinylidene chloride film, polyvinyl alcohol film, polyethylene terephthalate film, polycarbonate Film, nylon film, polystyrene film, ethylene vinyl acetate copolymer film, ethylene vinyl alcohol copolymer film, polyethylene naphthalate film, fluorinated ethylene propylene film, aromatic polyamide film, polyacrylate film, polyether sulfone film, poly Plastic films such as ether imide film, polyimide film, acrylic resin film, and ionomer film It is used. The thickness of the support is preferably about 10 to 250 microns.
88 microns is more preferred.

In the reversible thermosensitive recording label of the present invention,
A protective layer, or an intermediate layer and a protective layer may be coated on the heat-sensitive recording layer. The role of the protective layer is to protect the surface of the card, and the role of the intermediate layer is to flatten the surface of the heat-sensitive recording layer and improve the adhesion between the heat-sensitive recording layer and the intermediate layer. The performance is improved. As the material of the intermediate layer and the protective layer, general-purpose thermoplastic resins, thermosetting resins, ultraviolet-curable resins, and the like are used.

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

As the pressure-sensitive adhesive or adhesive used on the back surface of the support substrate, a general-purpose pressure-sensitive adhesive or adhesive is used.
For example, acrylic resin type, urethane resin type, natural rubber type, synthetic rubber type, adhesive such as silicone resin type, or epoxy resin type, acrylic resin type, urethane resin type, polyester resin type, silicone resin type, polyimide resin type And the like, but the scope of the invention is not limited thereto. Also, until just before using the label,
General-purpose release paper such as high-quality paper or kraft paper laminated with polyethylene, cast-coated paper, impregnated paper, crepe paper, polypropylene-laminated paper, etc. Is used.

As the organic polymer binder used in the reversible thermosensitive recording section, general-purpose organic polymer materials soluble in an organic solvent or the like, for example, acrylic resin, polyester resin,
Urethane resins, vinyl acetate resins, styrene resins, norbornene resins, vinyl butyral resins, vinyl chloride resins, and the like can be used, and these can be used alone or in combination of two or more (including a mixture and a copolymer).

As the reversible coloring pigment, a leuco dye or the like can be used, whereby coloring in various colors such as black, red and blue can be achieved. Such leuco dyes include crystal violet lactone, 2- (2-chloroanilino) -6-diethylaminofluoran, 2-anilino-3-methyl-6-dibutylaminofluoran, 2- (2-chloroanilino) -6- Dibutylaminofluoran, 1,3-dimethyl-6-diethylaminofluoran, 2-N, N-dibenzylaminodiethylaminofluoran, 3-indolino-3- (p-dimethylaminophenyl) -6-dimethylaminophthalide , 3-
Diethylamino-7-chlorofluoran, 2- (2-fluorophenylamino) -6-diethylaminofluoran, 2- (2-fluorophenylamino) -6-di-n-butylaminofluoran, 3-diethylamino-7 -Cyclohexylaminofluoran, 3-diethylamino-6-methyl-7-anilinofluoran, 3-diethylamino-6-methyl-7-p-butylanilinofluoran, 3-cyclohexylamino-6-chlorofluoran, 2-anilino-3-methyl-6- (N-ethyl-p-toluidino)-
Fluoran, 3-pyrrolidino-6-methyl-7-anilinofluoran, 3-pyrrolidino-7-cyclohexylaminofluoran, 3-N-methylcyclohexylamino-6-methyl-7-anilinofluoran, 3-N -Ethylpentylamino-6-methyl-
7-anilinofluoran, 3-cyclohexylmethylamino
-6-methyl-7-anilinofluoran, 3-ethylisobutylamino-6-methyl-7-anilinofluoran, 3-propylmethylamino-6-methyl-7-anilinofluoran 3-dimethylamino- 7,8-benzofluoran 3,3-bis (1-n-butyl-2-methylindol-3-yl) phthalide 3,3-bis (1-ethyl-2-methylindol-3-yl) Phthalide 2-bromo-3-methyl-6-dibutylaminofluorane 1,3-dimethyl-6-dimethylaminofluorane 6-dimethylamino-benzo-fluorane and the like.

As the color developing / decoloring agent in the present invention, an amide compound represented by the chemical formula (1) and obtained by dehydration condensation of an aliphatic carboxylic acid having a phenolic hydroxyl group with an aliphatic amine is used. .

The amine component (R ³ NH ₂ ) used in the synthesis of the compound represented by the above formula (1) is an aliphatic amine compound such as propylamine, butylamine, pentylamine, hexylamine, heptylamine, octylamine. , Nonylamine, decylamine, undecylamine, dodecylamine, tridecylamine, tetradecylamine, pentadecylamine, hexadecylamine, heptadecylamine, octadecylamine and the like. In particular, in order to obtain good thermal recording characteristics, it is desirable that the amine has 6 to 22 carbon atoms in one molecule. In addition to these amines, diisopropylamine, dibutylamine, diamylamine, tripropylamine, tributylamine, cyclohexylamine, benzylamine, dibenzylamine, tribenzylamine and the like can be used for the same purpose.

Specific examples of the inorganic filler include kaolin,
Calcium carbonate, magnesium carbonate, barium sulfate, calcium sulfate, silicic acid, calcium silicate, magnesium silicate, basic magnesium silicate, pyroxene, sericite, silica, zirconia, gypsum, talc, diatomaceous earth, satin white, oxidation Inorganic pigments such as titanium and zinc oxide;

As the amine to be added, propylamine, butylamine, pentylamine, hexylamine,
Heptylamine, octylamine, nonylamine, decylamine, undecylamine, dodecylamine, tridecylamine, tetradecylamine, pentadecylamine, hexadecylamine, heptadecylamine, octadecylamine, diisopropylamine, dibutylamine, diamylamine, tripropyl Examples include amine, tributylamine, cyclohexylamine, benzylamine, dibenzylamine, tribenzylamine and the like.
Practically, it is particularly desirable that the amine has 6 to 22 carbon atoms in one molecule. In addition, amines containing an aromatic ring or an unsaturated bond in the group bonded to the nitrogen atom can also be used.

[0029] Examples of the heat-fusible substance to be added as other components include aluna wax, paraffin wax, and the like.
Polyethylene wax, polypropylene wax, stearamide, oleamide, palmitamide, lauric amide, N-laurylbenzamide, N
-Stearylbenzamide, N, N-distearylbenzamide, N, N-dilaurylbenzamide, N, N-
Distearyl terephthalamide, ethylenebisstearic acid amide, ethylenebispalmitic acid amide, benzenesulfonamide, toluenesulfonamide, ethylbenzenesulfonamide, octylbenzenesulfonamide, laurylbenzenesulfonamide, stearylbenzenesulfonamide, and the like.

If necessary, an additive such as an ultraviolet absorber can be added to the reversible thermosensitive recording composition.

The amount of the inorganic filler to be added is preferably 50% by weight or more, more preferably 50% by weight or more and 200% by weight or less, based on the solid content in the thermosensitive layer. If the amount of the inorganic filler is less than the preferred range, some or all of the effect of the inorganic filler on repeated durability may be insufficient. On the other hand, if the amount exceeds this preferred range, the print quality may be degraded.

The amount of the amine compound to be added is preferably not more than 20% by weight based on the amount of the color developing / color reducing agent in the heat-sensitive layer.
It is preferable that the content be 1% by weight or more and 10% by weight or less. When the amount of the amine compound is less than the preferred range,
Some of the effects on the improvement of appearance quality may be insufficient. On the other hand, if the amount exceeds this preferred range, some of the printing quality or image stability may be insufficient.

[0033]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Specific embodiments of the present invention will be described in detail below. However, the present invention is not limited to this. In the following embodiments, “parts” indicates parts by weight.

Embodiment 1 A coating solution for a heat-sensitive layer was prepared as follows.

First, as liquid A, 4 parts of 2-anilino-3-methyl-6-dibutylaminofluorane were dispersed in a liquid obtained by dissolving 4 parts of polyvinyl acetate (weight average molecular weight: about 70,000) in 31 parts of toluene. This was prepared.

Next, as solution B, p
-Hydroxyphenylacetic acid stearylamide (in the above chemical formula (1), R ¹ = R ² = H, m = 0, R ³ = C ₁₈
H ₃₇ and the one) 16 parts, 4 parts of palmitic acid amide, kaolin (average particle size of about 0.7 [mu] m, manufactured by ENGELHARD Corporation) 28 parts, was prepared a dispersion of 5 parts of stearyl amine.

After each of the liquids A and B was applied to a sand mill for 2 hours, the two were mixed and applied on a foamed polyester sheet having a thickness of about 25 μm using a bar coating machine.
After drying for 10 minutes, a heat-sensitive layer having a thickness of about 7 μm was obtained.

As a protective layer, a solution of polynorbornene (weight average molecular weight: about 100,000) dissolved in toluene was applied on the heat-sensitive layer to obtain a surface protective layer having a thickness of about 1 micron.

An acrylic resin-based pressure-sensitive adhesive is applied to the back surface of the heat-sensitive recording sheet thus obtained, and a release paper is adhered thereon, punched out to an arbitrary size, and is subjected to label-like reversible heat-sensitive recording. I got a sheet.

As a result of repeating printing and character erasing using this label-like thermosensitive recording sheet, it was confirmed that this sheet had an optical density of 0.6 or more and could be used repeatedly 200 times or more.

Embodiment 2 The reversible thermosensitive recording label prepared in Embodiment 1 is removed from the release paper, and then adhered to a vinyl chloride card having a thickness of 500 μm to form a card having a reversible thermosensitive recording portion. I got In this case, a concave portion is provided on the surface of the base material of the card, and the reversible thermosensitive recording label is attached to the concave portion,
The surface of the adhered portion and the surface of the unattached portion were substantially coplanar.

As a result of repeating printing and character erasing using this thermosensitive recording card, this card has an optical density of 0.6
As described above, it was confirmed that it can be used repeatedly 200 times or more.

Embodiment 3 A liquid A and a liquid B having the following composition were prepared in the same manner as in the first embodiment.

Solution A composition 2- (2-chloroanilino) -6-diethylaminofluoran 4 parts Polynorbornene (weight average molecular weight about 50,000) 8 parts Ethyl acetate 30 parts Solution B composition p-hydroxyphenylacetate dodecylamide (the above chemical formula (1) R ¹ = R ² = H, m = 0, R ³ = C ₁₂ H ₂₅ ) 23 parts Benzenesulfonamide 5 parts Kaolin 40 parts Ethyl acetate 120 parts Stearylamine 7 parts It was mixed and coated on a heat resistant paper about 50 microns thick to form a heat sensitive layer about 7 microns thick.

As a protective layer, polynorbornene containing 3% by weight of methyl stearate (weight average molecular weight: about 140,000) was applied on the heat-sensitive layer to obtain a surface protective layer having a thickness of about 0.5 μm. Was.

The heat-sensitive recording sheet produced in this manner was made into a label-like sheet in the same manner as in Embodiment 1, and was adhered to a 500-micron thick vinyl chloride card.

As a result of repeating printing and character erasing using the thus-prepared thermosensitive recording card, it was confirmed that the card had an optical density of 0.6 or more and could be used repeatedly 200 times or more.

Embodiment 4 In the same manner as in Embodiment 1, a coating solution for the heat-sensitive layer and a coating solution for the protective layer having the following composition were prepared, and these were coated with a bar coating machine to a thickness of about 25 μm. Coating was successively performed on a foamed polyester sheet to form a heat-sensitive layer having a thickness of 5 μm and a surface protective layer having a thickness of 1 μm.

Composition of heat-sensitive layer coating solution Leuco dye (TH-105, manufactured by Hodogaya Chemical) 2 parts p-hydroxyphenylacetic acid decylamide (in the above chemical formula (1), R ¹ = R ² = H, m = 0, R ³ = C ₁₀ H ₂₁ ) 12 parts Acrylic resin (Dianal BR-80, manufactured by Mitsubishi Rayon) 2 parts Ultraviolet absorber (SEESORB 701, manufactured by Cipro Kasei) 0.5 parts Stearamide 2 parts Kaolin 10 parts Stearylamine 4 parts Toluene 81.5 parts Protective layer coating liquid composition Polynorbornene (ARTON, manufactured by Nippon Synthetic Rubber) 10 parts Methyl stearate (pastel M-180, manufactured by Lion) 0.1 parts Toluene 79.9 parts Using the reversible thermosensitive recording sheet produced in
A reversible thermosensitive recording label was prepared in the same manner as in the first embodiment, and was adhered to a 500-micron thick vinyl chloride card in the same manner as in the second embodiment.

As a result of repeating printing and character erasing using the thus-prepared thermal recording card, it was confirmed that the card had an optical density of 0.6 or more and could be used repeatedly 200 times or more.

Fifth Embodiment In the same manner as in the first embodiment, a heat-sensitive layer coating solution having the following composition is prepared, and is coated on a foamed polyester sheet having a thickness of about 25 μm by a bar coating machine. Then, a heat sensitive layer having a thickness of 5 microns was formed.

Composition of heat-sensitive layer coating solution Leuco dye (TH-108, manufactured by Hodogaya Chemical) 2 parts p-hydroxyphenylacetic acid octylamide (in the above chemical formula (1), R ¹ = R ² = H, m = 0, R ³ = C ₈ H ₁₇ ) 12 parts Acrylic resin (Dianal BR-80, manufactured by Mitsubishi Rayon) 2 parts Ultraviolet absorber (SEESORB 701, manufactured by Cipro Kasei) 0.5 part Stearamide 2 parts Kaolin 18 Part dodecylamine 4 parts toluene 81.5 parts Next, a surface protective layer made of an ultraviolet curable resin was formed on the heat-sensitive layer to obtain a reversible heat-sensitive recording sheet.

Using the reversible thermosensitive recording sheet produced in this manner, a reversible thermosensitive recording label was produced in the same manner as in the first embodiment, and the label was prepared in the same manner as in the second embodiment. On a vinyl chloride card.

Printing and character erasure were repeated using the thermal recording card thus produced. As a result, it was confirmed that this card had an optical density of 0.6 or more and could be used repeatedly 200 times or more. In particular, as in this case, when an ultraviolet curable resin was used as the surface protective layer, good printing characteristics were maintained even when the card was repeatedly used 500 times or more.

When each of the following compounds A to D was used alone as a developer / decolorant in a reversible thermosensitive recording composition in the same manner as described above, in each case, It was confirmed that the reversible thermosensitive recording label had an optical density of at least 0.6 or more (especially 0.8 or more in the case of compounds A and B) and could be used repeatedly at least 200 times.

Compound A: diphenolic acid-stearylamide (tentative name: in the above chemical formula (1), R ¹ = methyl group, R ² = p-hydroxyphenyl group, m = 2, R ³ = C
₁₈ H ₃₇ and the one) Compound B: diphenol acid - dodecyl amide (tentative name, the chemical formula (1) R ¹ = methyl group in, R ² = p-hydroxyphenyl ^{group, m = 2, R 3 =} C 12 H ₂₅ and the one) compound C: diphenol acid - decyl amide (tentative name, the chemical formula (1) and in R ¹ = methyl, R ² = p-hydroxyphenyl group, and ^{m = 2, R 3 = C} 10 H 21 Compound D: Diphenolic acid-octylamide (tentative name, R ¹ = methyl group, R ² = p-hydroxyphenyl group, m = 2, R ³ = C ₈ H _{17 in} the above chemical formula (1)) In order to compare the repetitive printing characteristics of the reversible thermosensitive recording label and the card obtained according to the first to fifth embodiments with the repetitive printing characteristics of the reversible thermosensitive recording card obtained by the conventional technique, the following comparative examples are shown. As described above, to produce a reversible thermosensitive recording card by the prior art, and its characteristics were evaluated.

COMPARATIVE EXAMPLE A heat-sensitive layer coating liquid obtained by mixing liquids A and B having the following composition was applied onto a foamed polyester sheet having a thickness of about 25 μm, and dried at 60 ° C. for 10 minutes to obtain a coating. A thermosensitive layer having a thickness of 7 μm was formed, and a protective layer made of polynorbornene was further formed thereon to a thickness of about 1 μm to obtain a reversible thermosensitive recording layer.

Solution A Composition 2-anilino-3-methyl-6-dibutylaminofluoran 4 parts Polyvinyl alcohol (weight average molecular weight: about 50,000) 4 parts Water 30 parts Solution B Composition Complex of gallic acid and stearylamine 16 Parts palmitic acid amide 4 parts water 120 parts
In the same manner as in No. 5, it was adhered to a vinyl chloride card having a thickness of 500 microns. The printing sensitivity of this card was low, and when it was repeatedly used several times to more than ten and more times, the printing contrast and the surface condition of the label deteriorated, so that the card was not practical.

[0059]

As described in detail above, according to the present invention,
It is possible to obtain a label and a card provided with a rewritable reversible thermosensitive recording section having excellent temporal image stability and repetitive durability. In addition, the labels and cards obtained in this way are also excellent in mass productivity, and by using them, it has become possible to achieve a reversible thermosensitive recording system with high reliability and high yield.

Continuation of the front page (51) Int.Cl. ⁶ Identification symbol FI B41M 5/18 109 (72) Inventor Kazuo Nade 3819 Nototo, Tama-ku, Kawasaki City, Kanagawa Prefecture Inside Sliontec Co., Ltd.

Claims (3)

[Claims] 1. A reversible thermosensitive recording label comprising a support substrate provided with a reversible thermosensitive recording layer on one side and a pressure-sensitive adhesive layer or an adhesive layer on the other side. A reversible thermosensitive recording label, characterized in that the layer contains at least an organic polymer-based binder, a reversible coloring dye and a developing / decoloring agent represented by the following chemical formula (1). Embedded image 2. The reversible thermosensitive recording label according to claim 1, wherein the reversible thermosensitive recording layer contains an inorganic filler and an amine compound. 3. A reversible thermosensitive recording card obtained by adhering the reversible thermosensitive recording label according to claim 1 or 2 to a card-like substrate by virtue of the tackiness or adhesiveness of the reversible thermosensitive recording label.