JPH09290584A - Card with reversible thermosensitive recording layer - Google Patents

Abstract

(57) An object of the present invention is to provide a reversible thermosensitive recording layer on a part or the whole surface and to eliminate a gap between a card and the reversible thermosensitive recording layer so that the reversible thermosensitive recording layer becomes cloudy and transparent. Provided is a card having a reversible heat-sensitive recording layer which is firmly adhered onto a card without destroying its characteristics and which is free from warpage of the card due to a difference in heat shrinkage of a card substrate. SOLUTION: In the injection molding of a card in which a resin is injected into a mold for molding, a reversible thermosensitive recording medium is inserted into the mold in a position corresponding to the front surface or the back surface, or the front and back surfaces of the card, and molding with the resin. In the card having a reversible thermosensitive recording layer, the reversible thermosensitive recording medium has a constitution in which a release layer, a protective layer, a reversible thermosensitive layer, a coloring layer and an adhesive layer are sequentially laminated on a support, The layer is inserted so as to face the outer surface of the card, a resin is injected into a mold to mold the card, and then the support of the reversible thermosensitive recording medium is peeled off.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a membership card, ID
The present invention relates to an information recording medium such as a card, a credit card, a cash card, and an IC card, and relates to a card having an information recording by magnetic data and electronic data and a reversible thermosensitive recording layer having both visible information.

[0002]

2. Description of the Related Art Conventionally, card supports made of vinyl chloride resin have been mainly used for membership cards, 1D cards, credit cards, cash cards, IC cards and the like. As an information recording system for these cards, it is widely known that a magnetic tape or an IC chip capable of magnetic recording is provided on a part of the card and information is recorded by digital or analog signals.

When displaying or confirming the information recording contents of these cards, it is necessary to read the recorded information with a dedicated reader, and there is no means for the general user to confirm. In addition, as a special usage, in the case of membership cards etc., if members use this card according to certain regulations, they may give premiums, points, etc. to members, but in this case, premiums, points, etc. in the card , For example, it was necessary to record it magnetically and to introduce it in a guide other than this.

Recently, there is an increasing demand for simply displaying the information recorded on the card, and particularly for membership cards and the like, there is a growing demand for displaying premiums, points, etc. on the card. In order to meet this requirement, a magnetic microcapsule in which a magnetic material is enclosed in a microcapsule is adhered to the front or back surface of the card with an adhesive or the like, and a card that displays a part of information recorded contents is developed. ing. However, since the magnetic material of the magnetic microcapsule has a dark color tone that is close to metallic color or black, there is a risk of impairing contrast or design.

In order to solve these problems, a method has been proposed in which an organic low molecule is dispersed in a resin binder to change the color to cloudy or transparent depending on the temperature at which it is applied, and reversible recording is performed by this contrast. As a method of forming the reversible thermosensitive recording layer on a card, there is a method of forming a recess in a part of the card and adhering the reversible thermosensitive recording layer with an adhesive or the like. However, since it is attached to the concave portion of the card with an adhesive or the like, a gap is formed between the side wall of the card concave portion and the end face of the reversible thermosensitive recording layer, which cannot be prevented. There was a risk of peeling. Further, it is technically difficult to make the surface of the card almost completely flush with the surface of the card support even if the card is provided with recesses and bonded together. Further, when the reversible thermosensitive recording layer is provided on the card by the thermal lamination method or the injection molding method, the card of the reversible thermosensitive recording layer is largely warped because the support and the card base material have different thermal contraction. It was not the target.

[0006]

SUMMARY OF THE INVENTION The present invention has been made by paying attention to the above problems, and a reversible thermosensitive recording layer can be provided on a part or all of the surface, and an adhesive or the like can be used. The gap between the card and the reversible thermosensitive recording layer caused by adhesion can be eliminated, and the card is firmly adhered to the card without destroying the cloudiness and transparency characteristics of the reversible thermosensitive recording layer and the heat shrinkage of the card substrate. It is an object of the present invention to provide a card having a reversible heat-sensitive recording layer in which the warp of the card due to the difference between the two is eliminated.

[0007]

A first aspect of the present invention, which has been made to achieve the above object, is injection molding of a card in which a resin is injected into a mold to form a card in the mold. In a card having a reversible thermosensitive recording layer in which a reversible thermosensitive recording medium is inserted at a position corresponding to the front surface or the back surface of a card mold, or a front surface and a back surface, and the reversible thermosensitive recording medium is formed on a support, A peeling layer, a protective layer, a reversible heat-sensitive layer, a coloring layer, and an adhesive layer were sequentially laminated, and the reversible heat-sensitive layer was inserted so as to face the outer surface of the card, and then a resin was injected into a mold to mold the card. After that, the support of the reversible thermosensitive recording medium is peeled off to provide a reversible thermosensitive recording layer.

In a second aspect of the invention, a reversible thermosensitive recording layer is partially provided on the support, the reversible thermosensitive recording layer is inserted so as to face the outer surface of the card, and then the resin is placed in a mold. When a card was formed by injecting, the card was molded so that there was no gap between the reversible thermosensitive recording layer and the injection resin, and then the support was peeled off to provide a partial reversible thermosensitive recording layer. It is characterized by

In a third aspect of the invention, the reversible thermosensitive layer of the reversible thermosensitive recording layer provided on the support comprises a resin base material and an organic low molecular weight substance dispersed in the resin base material. It is characterized in that its cloudiness and transparency change reversibly depending on the temperature of the main component.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a cross-sectional view of a reversible thermosensitive recording medium used in a card having a reversible thermosensitive recording layer of the present invention, which is a basic configuration of the present invention. First, the reversible thermosensitive recording medium comprises a support 1 such as a plastic film.
The release layer 2 is provided on the upper layer by a printing method, a coating method, or the like, the protective layer 3 is provided on the release layer 2 by a printing method, a coating method, or the like, and the resin base material and the resin are provided on the protective layer. A reversible heat-sensitive layer 4 which contains an organic low-molecular substance dispersed in a base material as a main component and whose cloudiness and transparency reversibly change depending on temperature is provided by a printing method, a coating method, or the like. If necessary, a coloring layer 5 is provided on the upper layer of the thermal layer 4 by a printing method, a coating method, a vapor deposition method, a sputtering method, or the like, and an adhesive layer 6 is provided on the upper layer of the coloring layer 5 by a printing method, a coating method, or the like. 1 shows a basic structure of a reversible thermosensitive recording medium according to the present invention.

FIG. 2 is a cross-sectional view of a reversible thermosensitive transfer medium used in a card having the reversible thermosensitive recording layer of the present invention, which is an embodiment of the reversible thermosensitive transfer medium of the present invention. The reversible thermosensitive recording layer is partially provided, and a picture layer is further provided around it. This reversible heat-sensitive recording layer has the same structure as that of FIG. 1, which is a basic structure, but has a structure in which a picture layer 7 is provided in the periphery thereof by a printing method or the like in addition to the partially provided reversible heat-sensitive recording layer.

FIG. 3 is a plan view of an embodiment in which the reversible thermosensitive recording medium according to the present invention is inserted into a mold and a molding resin 8 is injected to form a reversible thermosensitive recording layer on a card. is there.
Further, a magnetic recording section can be provided if necessary, and FIG. 3 schematically shows the magnetic recording section.

1 and 2, the reversible thermosensitive recording medium 9 is shown.
After being inserted into a mold and injecting a resin to adhere it to a card, in order to remove and remove the support 1 of this recording medium 9, a mechanically tough, flexible and flexible layer A relatively thin polyethylene film, polypropylene film, or other plastic film made of a polymer material is used. Preferably, the plastic film is a polyethylene terephthalate (PET) film having a thickness of 12 μm to 100 μm.

The release layer 2 is formed by coating a polymeric material to a thickness of 0.5 μm to 5 μm by a printing method, a coating method or the like. After the recording medium is adhered, the support 1 and the reversible thermosensitive recording layer 10 and It is necessary to transfer the pattern layer 7 to the injected resin and separate it. As the polymer material, a polyvinyl chloride resin, a polyester resin, a polyethylene resin, an acrylic resin, a melamine resin, or the like is used alone or in combination. Furthermore, the reversible thermosensitive recording layer 10
Also, as an additive to be added to enhance transferability with the pattern layer 7, silicone oil, polymer modified silicone oil, silicone wax, fluorine-based release agent, etc. are used.

The protective layer 3 plays a role of protecting the reversible heat-sensitive layer 4 and the subsequent layers, and can be provided with a film thickness of about 0.5 to 5 μm by a printing method, a coating method or the like. Examples of the resin used include known thermoplastic resins such as acrylic resin, urethane resin, vinyl chloride resin-vinyl acetate copolymer resin, polyester resin, melamine resin, epoxy resin, polystyrene resin, and the like. A thermosetting resin, an ultraviolet ray or an electron beam curing resin may be used alone or in combination. To further improve resistance, isocyanate-based curing agents, waxes such as polyethylene wax, carnauba wax, silicone wax, calcium carbonate, zinc stearate,
Extending pigments such as silica, alumina and talc, and oils and fats such as silicone oils and fats can be added within a range not impairing transparency.

The reversible heat-sensitive layer 4 reversibly changes its white turbidity / transparency due to the change in the crystalline state of the organic low-molecular substance dispersed in the matrix of the resin matrix, so that the film thickness can be changed by a printing method, a coating method or the like. The thickness can be set to about 4 to 20 μm. Examples of the organic low-molecular substance dispersed in the reversible thermosensitive layer include fatty acids or fatty acid derivatives or alicyclic organic acids, and more specifically, saturated or unsaturated ones, dicarboxylic acids, or esters thereof, It includes amide and the like. Specific examples of the saturated fatty acid include undecanoic acid, lauric acid, myristic acid, pentadecanoic acid, palmitic acid, peptadecanoic acid, stearic acid, nanodecanoic acid, arachidic acid, behenic acid, lignoceric acid, cerotic acid, montanic acid, mericinic acid. And specific examples of the unsaturated fatty acid include oleic acid, elaidic acid, linoleic acid, sorbic acid, stearolic acid and the like. The fatty acid, the fatty acid derivative or the alicyclic organic acid is not limited to these, and one kind or a mixture of two or more kinds of these may be applied. As the resin base material used, homopolymers, mixtures or copolymers of acrylic resin, urethane resin, polyester resin, cellulose acetate resin, nitrocellulose resin, vinyl chloride resin, vinyl acetate resin are used. To be To further improve resistance, a curing agent such as isocyanate can be added.

The colored layer 5 is a layer for improving the white turbidity / transparency contrast recorded in the reversible thermosensitive layer 4,
The coloring layer 5 can be formed by a printing method or a coating method using an ink in which a coloring pigment, a dye or the like is dispersed and dissolved in a polymer material to have a film thickness of about 0.5 to 5 μm. As the polymer material, polyvinyl chloride, polyvinyl chloride vinyl acetate copolymer, polyester resin, polyethylene resin, acrylic resin, etc. may be used alone or in combination, preferably polyvinyl chloride, polyvinyl chloride acetic acid. Vinyl copolymers and polyester resins are used. The colored layer 5 is formed by a vacuum deposition method, a sputtering method, an ion plating method, a lamination method, or the like in addition to the printing method or the coating method, and the film thickness is 0.03 to 0 by the vacuum deposition method, the sputtering method, or the ion plating method. 0.08 μm, and can be provided in a thickness of about 0.5 to 2 μm by a laminating method. Materials that can be applied by the thin film forming method include
For example, Al, Cr, Sn, Ni, Cu or the like is used.
Further, the color tone can be adjusted by using the materials used in combination.

The adhesive layer 6 is printed with a polymer material having a softening point of 150 ° C. or less so that the reversible thermosensitive recording medium 9 according to the present invention is inserted into a mold and resin is injected to transfer and adhere to a card. Film thickness by coating method or coating method
It is applied and provided on. As the polymer material, polyvinyl chloride, polyvinyl chloride vinyl acetate copolymer, polyester resin, polyethylene resin, polyurethane resin, acrylic resin may be used alone or in combination, and preferably polyurethane resin or polyester. Resins are good.
That is, the adhesive layer 6 can be made of any resin suitable for the injection resin.

The pattern layer 7 is printed with patterns and characters, but can be provided by a known printing method such as an offset printing method, a gravure printing method, a screen printing method or the like. Examples of the resin used include inks such as polyester acrylate resin, polyurethane acrylate resin, epoxy acrylate resin, and alkyd resin, or cellulose resin, chlorinated polypropylene, vinyl chloride /
Ink such as vinyl acetate copolymer resin, polyester resin, acrylic resin, and acrylic polyol resin can be used.

The molding resin 8 is a main constituent layer when formed into a card. The reversible thermosensitive recording medium 9 including the reversible thermosensitive recording layer 10 is inserted into one of the front surface and the back surface of the card in the mold and adsorbed. Adsorption is performed by a method such as suction of air to inject the resin 8. As the resin used, general-purpose polystyrene resin, impact-resistant polystyrene resin, acrylonitrile-styrene resin, ABS
Resin, acrylic resin, polyethylene resin, polypropylene resin, polyamide resin, polyacetal resin, polycarbonate resin, vinyl chloride resin, modified PPO resin, polybutylene terephthalate resin, polyphenylene sulphalde resin, or other thermoplastic resin, or a composite of these materials Alloy-based resins, and further reinforced resins by addition of glass fibers can be used.

The reversible thermosensitive recording layer 1 is formed by molding the card 11.
A reversible thermal transfer medium 9 containing 0, the surface of the card in the mold,
Alternatively, it is inserted into one position corresponding to the back surface and is adsorbed. The reversible heat-sensitive transfer medium 9 inserted into the mold by the above method is injected with the molding resin 8 after the mold is clamped, and then the card 11 is molded. Further, it goes without saying that a card may be formed by an injection compression molding method for the purpose of improving the filling property of the resin, and after the injection or the injection compression, the molding resin 8 is cooled in the mold and the card 11 is formed.
Is obtained.

According to the present invention, when the reversible thermosensitive recording layer 10 is provided on a card or the like, the card (card base material) formed by injection molding and the reversible thermosensitive recording layer 10 are adhered to each other without any gap, and The reversible thermosensitive recording layer can be provided without limiting the display area. Further, unlike the method of adhering with a pressure sensitive adhesive or the like, the reversible thermosensitive recording layer can be formed flush on the card by resin molding using a mold, so that the adhesiveness with the thermal head used for printing is good. The printing quality is improved, and it becomes possible to firmly adhere to the card without destroying the characteristics of cloudiness and transparency.

[0023]

EXAMPLES Examples of the present invention will be described in detail below.

Example 1 A release layer coating material was applied onto a support 1 made of a transparent polyethylene terephthalate (hereinafter referred to as PET) film having a thickness of 50 μm by a gravure method at a drying temperature of 110 ° C. and a coating thickness of 1.5 μm. The release layer 2 was provided. The protective layer coating was applied to the upper layer by a gravure method at a drying temperature of 110 ° C. and a coating thickness of 2 μm to form a protective layer 3. The reversible thermosensitive coating was applied to the upper layer by a gravure method at a drying temperature of 120 ° C. and a coating thickness of 6 μm to form a reversible thermosensitive layer 4. A film thickness of 0.0 is formed on the upper layer by a vacuum deposition method.
A 5 μm Al layer was formed and a colored layer 5 was provided. Further, an adhesive paint is dried on the upper layer by a gravure method at a drying temperature of 100.
A reversible thermosensitive recording medium 9 was obtained by applying the adhesive layer 6 at a temperature of 1.0 ° C. and a coating thickness of 1.0 μm.

The reversible thermosensitive recording medium 9 obtained by the above method was inserted and adsorbed at a position corresponding to the surface of a mold formed into a card shape so that the support side was in contact with the mold, and then acrylonitrile-butadiene. A styrene resin molding resin 8 was injected, and after cooling and solidification, the support 1 was peeled off to obtain a card 11.

The reversible thermosensitive recording layer 10 of the obtained card 11
Has a reversible thermosensitive recording layer formed on the support 1 in advance, so that the surface is smooth and has good adhesion to the thermal head, and it has a white turbidity / transparency characteristic without being affected by the heat of the molten molding resin. It could be molded on the card while maintaining it. Printing was performed on the reversible thermosensitive recording layer 10 with a thermal head, and recording was possible at an applied energy of 0.45 mJ / dot. Furthermore, the applied energy is 0.2 mJ / d for erasing.
The data could be erased at ot. The composition of the paint used for card production is shown below. [Release layer paint] Polyester resin 30 parts by weight Polyester modified silicone 3 parts by weight Toluene 40 parts by weight Methyl ethyl ketone 40 parts by weight Methyl isobutyl ketone 20 parts by weight [Protection layer paint] Acrylic UV monomer 50 parts by weight Photoinitiator 1 part by weight Methanol 20 Parts by weight [Reversible heat-sensitive layer paint] stearic acid 7 parts by weight sebacic acid 2 parts by weight vinyl chloride vinyl chloride copolymer resin 6 parts by weight tetrahydrofuran 30 parts by weight toluene 10 parts by weight [adhesive layer paint] polyester resin 40 parts by weight toluene 40 parts by weight Part Methyl ethyl ketone 40 parts by weight

Example 2 The release layer coating material was applied onto the support 1 made of a transparent PET film having a thickness of 50 μm by a gravure method at a drying temperature of 110 ° C. and a coating thickness of 1.5 μm to form a release layer 2. A protective layer coating was applied to the upper layer by a gravure method at a drying temperature of 110 ° C. and a coating thickness of 2 μm to form a protective layer 3. A reversible thermosensitive coating was applied to the upper layer by a gravure method at a drying temperature of 120 ° C. and a coating thickness of 6 μm to form a reversible thermosensitive layer 4 so as to be located at a partial position of the card. Using a gravure printing method, a coloring layer coating material is applied to the upper layer so as to overlap the reversible thermosensitive layer 4 by a gravure printing method at a drying temperature of 100 ° C. and a coating thickness of 2 μm
Then, the colored layer 5 was provided so that the colored layer 5 was applied to a part of the card. On the portion other than the reversible thermosensitive layer 4, a pattern or the like was formed by a gravure method at a drying temperature of 100 ° C. and a coating thickness of 1 μm to form a pattern layer 7. Further, an adhesive coating was applied to the upper layer by a gravure method at a drying temperature of 100 ° C. and a coating thickness of 1.0 μm to form an adhesive layer 6, and a reversible thermosensitive recording medium 9 was obtained. Here, for the constituent layers other than the colored layer 5 and the pattern layer 7, the same coating material as in Example 1 was used.

The reversible thermosensitive recording medium 9 obtained by the above-mentioned method was inserted into a position corresponding to the surface of a card-shaped mold so that the support side was in contact with the mold, and then an acrylonitrile-butadiene-styrene resin was used. Molding resin 8
After being injected and cooled and solidified, the support 1 was peeled off to obtain a card 11.

The reversible thermosensitive recording layer 10 of the obtained card 11
Has a reversible thermosensitive recording layer formed on the support 1 in advance and has a smooth surface and good adhesion to the thermal head, and has a white turbidity / transparency characteristic without being affected by the heat of the molten molding resin. It could be molded on the card while maintaining it. The reversible heat-sensitive recording layer was printed by a thermal head and could be recorded with an applied energy of 0.45 mJ / dot. Furthermore, the data could be erased at an applied energy of 0.2 mJ / dot. The composition of the paint used for card production is shown below. [Colored layer paint] Black pigment 10 parts by weight Polyester acrylate resin 30 parts by weight Toluene 20 parts by weight Methyl ethyl ketone 40 parts by weight

<Comparative Example 1> As a comparative example, although not shown, a structure in which a reversible thermosensitive recording layer is provided on the surface of a card by a thermal laminating method will be described below. The card according to this comparative example was formed by depositing Al as a colored layer on a support made of a biaxially stretched PET film having a thickness of 38 μm by a vapor deposition method.
Was vapor-deposited to a thickness of 0.05 μm to form a colored layer. A reversible heat-sensitive coating material was applied thereon to a coating thickness of 10 μm at a drying temperature of 120 ° C. using a gravure coater to form a reversible heat-sensitive layer. A protective layer coating is applied on this with a coating thickness of 2.5 μm at a drying temperature of 120 ° C. to form a protective layer, and an adhesive layer coating is coated on the back surface of the support at a drying temperature of 110 ° C. A reversible heat-sensitive recording medium was formed by applying it to a thickness of 2.0 μm, and this medium was adhered to the entire surface of a PVC card by a thermal laminating method. Here, the same paint as in Example 1 was used for each constituent layer.

The obtained card has a card warp of 5 mm.
As described above, since the adhesion to the thermal head is poor, printing and erasing with the thermal head were impossible.

<Comparative Example 2> As a comparative example, although not shown, a structure in which a reversible thermosensitive recording layer is provided on the card surface with an adhesive will be described below. The card according to this comparative example was prepared by depositing Al as a colored layer on a support made of a biaxially stretched PET film having a thickness of 25 μm by a vapor deposition method.
It vapor-deposited to a thickness of 05 μm to form a colored layer. A reversible heat-sensitive paint is dried on this with a gravure coater at a drying temperature of 120.
A reversible heat-sensitive layer was formed by applying the coating solution at 10 ° C. to a coating thickness of 10 μm. Further, a reversible thermosensitive recording medium on which a protective layer was formed by applying a protective layer coating material at a drying temperature of 120 ° C. to a coating thickness of 2.5 μm using a gravure coater was partially adhered to a PVC card with an adhesive. . Here, for each of the constituent layers, the same paint as in Example 1 was used in the above-mentioned embodiment.

The obtained card has an applied energy of 0.4.
It was possible to print at 5 mJ / dot, and the print data could be erased with a thermal head at an applied energy of 0.2 mJ / dot, but the surface condition was not smooth, and there were partial printing defects and unprinted parts. Occurred and the print quality was not good. Further, the card and the reversible heat-sensitive recording portion were rubbed with a thermal head or the like and peeled off.

<Card Comparison Test> As described above, the cards obtained in Examples 1 and 2 and Comparative Examples 1 and 2 were compared.
The card obtained in 1. was evaluated. The results are shown in Table 1.

[0035]

[Table 1]

[0036]

The card having the reversible thermosensitive recording layer of the reversible thermosensitive recording medium produced according to the present invention has a reversible thermosensitive recording layer on the front surface or the back surface of the card, on the whole surface or a part thereof, and on the card. It became possible to provide the card firmly and flush with the surface of the card without any gap between the thermal recording layer. Further, by using the reversible thermosensitive recording medium, it becomes possible to prevent the card from warping as compared with a card injection-molded with a conventional base material. Further, when the reversible thermosensitive recording layer is provided on the card, it is possible to simultaneously provide characters and pictures. Further, since the reversible thermosensitive recording layer has a reversible thermosensitive recording layer formed on the support in advance, the surface is smooth and has good adhesion to the thermal head, and is affected by the heat of the melted molding resin. It was possible to mold on a card while maintaining the characteristics of cloudiness and transparency.

[Brief description of drawings]

FIG. 1 is an explanatory view showing a cross section of a reversible thermosensitive recording medium showing an embodiment of the present invention.

FIG. 2 is an explanatory view showing a cross section of a reversible thermosensitive recording medium showing another embodiment of the present invention.

FIG. 3 is a plan view of a card in which a reversible thermosensitive recording layer is provided on the card by using the reversible thermosensitive recording medium according to one embodiment of the present invention, and the magnetic recording layer is schematically shown. .

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Support 2 ... Release layer 3 ... Protective layer 4 ... Reversible thermosensitive layer 5 ... Colored layer 6 ... Adhesive layer 7 ... Picture layer 8 ... Molding resin 9 ... Reversible thermosensitive recording medium 10 ... Reversible thermosensitive recording layer 11 ... card

Continuation of the front page (51) Int.Cl. ⁶ Identification number Office reference number FI Technical display location B32B 27/00 B32B 27/00 G B41M 5/36 B41M 5/26 102 G06K 19/08 G06K 19/00 F

Claims (3)

[Claims] 1. A resin injection molding method in which a resin is injected into a mold to insert a reversible thermosensitive recording medium at a position corresponding to the front surface, the back surface, or the front and back surfaces of the card mold. In a card having a reversible thermosensitive recording layer to be molded, the reversible thermosensitive recording medium has a constitution in which a release layer, a protective layer, a reversible thermosensitive layer, a coloring layer and an adhesive layer are laminated in this order on the support. After inserting the heat layer so as to face the outer surface of the card, the resin was injected into the mold to mold the card, and then the support of the reversible thermosensitive recording medium was peeled off to provide the reversible thermosensitive recording layer. A card having a reversible thermosensitive recording layer. 2. A reversible thermosensitive recording layer is partially provided on the support, the reversible thermosensitive recording layer is inserted so as to face the outer surface of the card, and a resin is injected into a mold to mold the card. In this case, after forming a card so that there is no gap between the reversible thermosensitive recording layer and the injection resin, the support is peeled off to provide a partial reversible thermosensitive recording layer. Item 2. A card having the reversible thermosensitive recording unit according to item 1. 3. The reversible heat-sensitive layer of the reversible heat-sensitive recording layer provided on the support has a temperature mainly composed of a resin base material and an organic low molecular weight substance dispersed in the resin base material. Depends on
The card having the reversible thermosensitive recording layer according to claim 1, wherein the cloudiness and the transparency thereof reversibly change.