JP2000025346A - Display recording medium - Google Patents

Abstract

PROBLEM TO BE SOLVED: To whiten on the same display media by foaming as an irreversible display in addition to whitening and clarity of a reversible display medium by incorporating a heating type foaming agent in a recording layer of the reversible medium of a polymer/low molecular weight type of a reversible thermosensitive recording medium. SOLUTION: A reversible thermosensitive recording layer 3 (containing a foaming agent) obtained by incorporating an organic low molecular substance as a main component and adding a foaming agent and a foaming assistant and dispersing them in a resin matrix is provided on upper surface of a support 1 of a plastic sheet or the like by a printing method or a coating method. A coloring (reflecting) layer 2 is formed on a lower layer of the layer 3 by the similar method as needed. Further, a protective layer 5 is provided on an upper layer of the layer 3, and an adhesive layer is provided between layers necessary to strengthen an adhesive force to form the display recording medium. The recording medium can also be formed by disposing a foaming layer containing a heating type foaming agent on an upper or lower layer of the thermosensitive recording layer.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a membership card, an ID,
The present invention relates to an information recording medium such as a card, a credit card, a cash card, an IC card, and a prepaid card, and enables a wider use of a card having both information recording by magnetic data and electronic data and its visible information.

[0002]

2. Description of the Related Art Heretofore, cards made of vinyl chloride resin or polyester resin have been mainly used for membership cards, ID cards, credit cards, cash cards, IC cards, prepaid cards, and the like. Information recording of these cards is performed by digital or analog signals by providing a magnetic tape, a magnetic recording layer, or an IC chip capable of magnetic recording on a part of the card. By the way, when displaying or confirming the information recorded contents of these cards, it is necessary to read the recorded information with a dedicated reader, and it is difficult for a general user to confirm. Therefore, demands for simple display of such information recording contents are increasing. In recent years, irreversible and reversible display recording media have been developed to satisfy this demand. In particular, when the reversible display recording medium is applied to a point card or the like, display information can be continuously updated, and not only a prepaid card but also a cash card and a credit card can be used. As a reversible display medium, a low-molecular organic compound is dispersed in a resin binder to form a cloudy liquid.
A polymer / low-molecular type reversible display technology for displaying with transparent contrast has been developed. The polymer / low-molecular type reversible display medium is composed of a plastic sheet / coloring (reflection) layer / recording (polymer / low-molecule) layer / protective layer. The principle.

[0003]

By the way, in a card provided with such a rewriting type display function,
Correction and erasure are easy in principle. For example, in the reversible display medium of the above-mentioned high molecular weight / low molecular weight type, it is possible to correct and erase by applying a certain thermal stimulus. Therefore, for example, when using as a lottery, it becomes possible to reproduce a lottery for which a lottery has already been performed. Also, when using as a point card, if a certain service is provided after a certain point has passed and the card is to be used continuously, it is necessary to check whether the service has already been performed with a magnetic recording medium etc. It is necessary to use together. Furthermore, if the rewritable display portion can be fixed so that it cannot be rewritten under certain conditions, effects such as preventing unauthorized use of the card can be obtained. Rewriting cannot be prohibited only in such cases.
Therefore, there is a need to develop a display medium that can perform irreversible thermal recording on the same medium together with polymer / low-molecular type reversible thermal recording and perform irreversible recording only under necessary conditions. It has become.

[0004]

DISCLOSURE OF THE INVENTION The present invention has been made in view of the above-mentioned problems. In the first aspect, the recording layer of the polymer / low-molecular type reversible display medium is heated. According to the second aspect of the present invention, a foaming agent is contained, and an irreversible recording layer containing a heating type foaming agent is provided in the polymer / low-molecular type reversible display medium. Another object of the present invention is to provide a display recording medium characterized in that clouding due to foaming can be performed on the same display medium as irreversible display. According to the first aspect, in the simplicity in manufacturing and the contrast of the irreversible display,
In the second aspect, there are advantages in the characteristics and durability of the reversible recording. By setting the foaming temperature of the heat-type foamable resin to be equal to or higher than the temperature at which the reversible display medium is used for opacity-transparency, the reversible display is usually used as a reversible display. By applying heat equal to or higher than the foaming start temperature, it is possible to irreversibly cloud the entire surface and a part thereof. According to a third aspect, the new display recording medium according to the first and second aspects is provided.
By integrating the card recording medium with the entire surface of the card support and a part thereof and adding the same display recording function to the card medium, the applicable range can be expanded.

[0005]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a cross-sectional view of a display recording medium of the present invention, which is a basic configuration of the present invention. That is, as shown in FIG. 1, a resin base material and an organic low-molecular substance dispersed in the resin base material are used as a main component, and a foaming agent and a foaming assistant are added to the upper layer of the support 1 made of a plastic sheet. The added recording layer 3 (foaming agent) is provided by a printing method or a coating method, and a coloring (reflection) layer 2 is formed under the recording layer 3 by a printing method, a coating method, or a vapor deposition method, if necessary. The basic configuration is such that a protective layer 5 is provided on the upper layer by a printing method or a coating method, and an adhesive layer is provided by a printing method or a coating method between layers requiring further enhancement of adhesive strength.

FIG. 2 is a sectional view of the display recording medium of the present invention, and is a part of the structure of the present invention. That is, as shown in FIG. 2, a recording layer 3 mainly composed of a resin base material and an organic low-molecular substance dispersed in the resin base material is printed or coated on the upper layer of the support 1 made of a plastic sheet. The coloring (reflection) layer 2 was provided below the recording layer 3 by a printing method, a coating method, or a vapor deposition method as needed. A foaming layer 4 containing a foaming agent and a foaming aid was provided on the recording layer 3 by a printing method or a coating method, and a protective layer 5 was provided by a printing method or a coating method. Further, an adhesive layer is provided by a printing method or a coating method between layers that need to be further enhanced in adhesive strength.

FIG. 3 is a sectional view of the display recording medium of the present invention, which is a part of the structure of the present invention. That is, as shown in FIG. 3, a recording layer 3 mainly composed of a resin base material and an organic low-molecular substance dispersed in the resin base material, or a foaming agent and a foam The recording layer 3 to which the auxiliary agent is added is provided by a printing method or a coating method, and if necessary, the foam layer 4 containing a foaming agent and a foaming auxiliary is colored (reflection) on the lower layer of the recording layer 3 by a printing method and a coating method. ) Printing or coating method of the layer 2, printing or coating method of the protective layer 5 on the recording layer 3 on the recording layer 3, and printing or coating method of the adhesive layer between the layers which need to strengthen the adhesive force. Provided by Further, the adhesive layer 6 is provided by a printing method or a coating method on a surface opposite to the surface of the plastic support on which the recording layer is provided, and is integrated with a card support 7 composed of at least one layer.

The support 1 of the display recording medium shown in FIGS. 1, 2 and 3 is made of a mechanically tough, relatively thin, flexible or flexible polyethylene, polypropylene or other polymer material. A plastic film or the like is used. Preferably the plastic film is 1 to
A 100 μm polyethylene terephthalate (PET) film is used. The sheet according to claims 1 and 2 refers to the support 1.

The colored (reflective) layer 2 shown in FIGS. 1, 2 and 3
Is a layer for improving the opacity-transparency contrast recorded on the recording layer 3. The ink is prepared by dispersing and dissolving a coloring pigment, a dye, and the like in a polymer material by a printing method or a coating method to a thickness of 0.5 to 0.5 μm. It can be provided at 5 μm. As the polymer material, polyvinyl chloride, polyvinyl chloride-vinyl acetate copolymer, polyester-based resin, polyethylene-based resin, acrylic-based resin and the like are used alone or in combination. Preferably, polyvinyl chloride, polyvinyl chloride-vinyl acetate copolymer, or polyester resin is used. The coloring layer 2 may be formed by a vacuum deposition method, a sputtering method, an ion plating method,
By a laminating method or the like, the film thickness is from 0.03 to 0.03 mm by a vacuum evaporation method, a sputtering method, or an ion plating method.
The thickness can be set to 0.08 μm and 0.5 to 2 μm by a lamination method. As a material applicable to the thin film forming method, for example, Al, Cr, Sn, Ni, Cu, or the like is used. Further, the color tone can be adjusted by using the used materials in combination.

The recording layer 3 shown in FIGS. 1, 2 and 3 has a reversible change in white turbidity and transparency due to a change in the crystalline state of the organic low-molecular substance dispersed in the matrix of the resin matrix. The reversible thermosensitive recording layer can be provided with a film thickness of 2 to 4 μm by a printing method, a coating method, or the like. Examples of the organic low-molecular substance dispersed in the reversible thermosensitive recording layer include a fatty acid or a fatty acid derivative or an alicyclic organic acid, and more specifically, a saturated or unsaturated substance, a dicarboxylic acid, or an ester thereof. , Amides and the like. Specific examples of the saturated fatty acids include undecanoic acid, lauric acid, myristic acid, pentadecanoic acid, palmitic acid, heptadecanoic acid, stearic acid, nanodecanoic acid, arachinic acid, behenic acid, lignoceric acid, serotinic acid, montanic acid, and melicic acid. And specific examples of unsaturated fatty acids include oleic acid, elaidic acid, linoleic acid, sorbic acid, stearic acid and the like. The fatty acids, fatty acid derivatives and alicyclic organic acids are not limited to these, and one or more of them may be used as a mixture. Further, as the resin base material used, acrylic resin, urethane resin, polyester resin, cellulose acetate resin, nitrocellulose resin, vinyl chloride resin, vinyl acetate resin alone,
Mixtures or copolymers are used. Furthermore, in order to improve the resistance to repeated printing and erasure, a curing agent for three-dimensional crosslinking corresponding to the resin base material, a cross-linking agent, etc., of 0.5 to
10% by weight can be added. On the other hand, in order to control the clearing temperature range of the reversible thermosensitive recording section, a plasticizer of the resin,
A high boiling solvent or the like can be added in an amount of 0.1 to 20% by weight based on the resin base material.

[0011] It is also possible to add a foaming agent and a foaming aid to the recording layer. Examples of the foaming agent include inorganic materials such as sodium bicarbonate, ammonium carbonate, ammonium bicarbonate, and ammonium nitrite, DPT, DMDNTA
Nitroso compounds, such as BSH, TSH, DPSDSH,
Sulfonic acid hydrazide compounds such as OBSH, ADC
Organic compounds such as A (ABFA), AIBN, DAB, barium-azodicarboxylate, trihydrazinotriazine, p-toluenesulfonyl semicarbazide, azo of 4-4 'oxybisbenzenesulfonyl semicarbazide, and diazo compounds can be used. . Further, in order to adjust the foaming start temperature of these foaming agents, foaming assistants such as salicylic acid, urea and compounds thereof can be used.

The foamed layer 4 shown in FIG. 2 is a material in which a foaming agent and a foaming auxiliary are dispersed in a resin base material, and has a thickness of 0.5 to 10 μm.
m. As the resin base material to be used, an acrylic resin, a urethane resin, a polyester resin, a cellulose acetate resin, a nitrocellulose resin, a vinyl chloride resin, a vinyl acetate resin alone, a mixture or a copolymer is used. Further, in order to improve the resistance to repeated printing and erasure, a curing agent or a crosslinking agent for three-dimensional crosslinking corresponding to the resin base material can be added in an amount of 0.5 to 10% by weight based on the resin base material. Examples of the foaming agent include inorganic materials such as sodium bicarbonate, ammonium carbonate, ammonium bicarbonate, and ammonium nitrite; nitroso compounds such as DPT and DMDNTA; BSH, TSH, DPDSH, and OB.
Sulfonic acid hydrazide compounds such as SH, ADCA
Organic compounds such as (ABFA), AIBN, DAB, barium-azodicarboxylate, trihydrazinotriazine, p-toluenesulfonylsemicarbazide, azo and diazo-based compounds of 4-4 ′ oxybisbenzenesulfonylsemicarbazide can be used. Further, in order to adjust the foaming start temperature of these foaming agents, foaming assistants such as salicylic acid, urea and compounds thereof can be used.

The protective layer 5 shown in FIGS. 1, 2 and 3 serves to protect the heat-sensitive recording layer and below.
It can be provided with a film thickness of 0.2 to 5 μm by a coating method or the like. Examples of the resin used include known resins such as acrylic resin, urethane resin, vinyl chloride resin-vinyl acetate copolymer resin, polyester resin, melamine resin, epoxy resin, polystyrene resin, and polyimide resin. Thermoplastic resin, ultraviolet ray or electron beam curable resin alone or in combination. Furthermore, in order to improve resistance and prevent sticking, a curing agent for crosslinking the resin, polyethylene wax, carnauba wax, waxes such as silicone wax, or calcium carbonate,
An extender such as zinc stearate, silica, alumina, and talc, and fats and oils such as silicone fats and oils can be added to the extent that transparency is not impaired. Further, in order to control the heat conductivity when printing and erasing with a thermal head, a hollow filler, beads or the like can be added in a range not to impair the transparency.

The adhesive layer 6 shown in FIG. 3 is made of a polymer material having a softening point of 150 ° C. or less by a printing method or a coating method so that the display recording medium is adhered to the card support 1.
It is provided by being applied to a thickness of 10 to 10 μm. As the polymer material, polyvinyl chloride, polyvinyl chloride-vinyl acetate copolymer, polyester resin, polyethylene resin, polyurethane resin, and acrylic resin are used alone or in combination. Preferably, a polyurethane resin or a polyester resin is used.

In FIG. 3, the card support 7 is composed of a center core and an oversheet, and a white, colored or transparent plastic sheet having printability can be applied to the center core. For example, materials such as polyvinyl chloride resin, polyester resin, polyolefin resin such as polyethylene and polypropylene, polycarbonate resin, and ABS resin can be used. The thickness is selected from the range of 50 to 200 μm in consideration of printability, and a sheet having a thickness of about 100 μm is preferable.

[0016]

EXAMPLES Example 1 A 0.05 μm thick Al layer was provided as a colored layer on one side of a plastic sheet 1 made of a transparent PET film having a thickness of 5.0 μm by using a vacuum evaporation method. In order to fix the recording layer on the aluminum surface,
The adhesive layer was provided by a gravure method at a drying temperature of 120 ° C. and a coating thickness of 2 μm. Next, the recording layer containing the reversible thermosensitive recording material and the foaming agent was dried at a drying temperature of 130 using a gravure method.
° C and a coating thickness of 6 µm. Further, a protective layer was provided on these layers at a coating pressure of 6 μm using a gravure method. In order to integrate the obtained reversible recording sheet with the card support, an adhesive layer was further provided on the surface on which the recording surface was not applied, and information was obtained by a hot roll method under the conditions of a roll temperature of 120 ° C. and a conveyance speed of 50 mm / s. A recording medium was obtained.

{Coating used in card production} (Thermal recording coating) Stearic acid 7 parts by weight Sebacic acid 2 parts by weight Bihydrochloride copolymer resin 6 parts by weight Trihydrazinotriazine 3 parts by weight Salicylic acid 1 part by weight Tetrahydrofuran 30 parts by weight Toluene 10 parts by weight (Adhesive coating) Polyester resin 40 parts by weight Toluene 40 parts by weight Methyl ethyl ketone 40 parts by weight (Protective layer coating) Acrylic resin 50 parts by weight Teflon filler 1.5 parts by weight Calcium carbonate 1.5 parts by weight Toluene 100 Parts by weight methyl ethyl ketone 100 parts by weight

The obtained information recording medium could be printed with an applied energy of 0.5 mJ / dot using a thermal head. Further, using the thermal head, the print data could be erased at an applied energy of 0.3 mJ / dot.
Next, printing with a foaming agent was possible at an applied energy of 0.9 mJ / dot.

Example 2 Transparent PET having a thickness of 5.0 μm
An Al layer having a thickness of 0.05 μm was provided as a colored layer on one side of the plastic sheet 1 made of a film by using a vacuum evaporation method. In order to fix the recording layer on the upper surface of the aluminum surface, an adhesive layer was provided by a gravure method at a drying temperature of 120 ° C. and a coating thickness of 2 μm. Next, a recording layer containing a reversible thermosensitive recording material is provided by a gravure method at a drying temperature of 130 ° C. and a coating thickness of 5 μm, and a foaming recording layer containing a foaming agent and a foaming aid is formed thereon by using a gravure method. Drying temperature 120 ° C,
The coating thickness was 5 μm. Further, a protective layer was provided on these layers with a coating thickness of 6 μm by using a gravure method to obtain an information recording medium.

{Coating used for card production} (Thermal recording coating) 7 parts by weight of stearic acid 2 parts by weight of sebacic acid 6 parts by weight of vinyl chloride-vinyl acetate copolymer 30 parts by weight of tetrahydrofuran 10 parts by weight of toluene 10 parts by weight (foaming recording layer) Hydrazinotriazine 3 parts by weight Salicylic acid 1 part by weight Vinyl chloride-vinyl acetate copolymer 10 parts by weight Toluene 10 parts by weight (protective layer coating) Acrylic resin 50 parts by weight Teflon filler 1.5 parts by weight Calcium carbonate 1.5 parts by weight Toluene 100 Parts by weight methyl ethyl ketone 100 parts by weight

The obtained information recording medium could be printed with an applied energy of 0.5 mJ / dot using a thermal head. Further, using the thermal head, the print data could be erased at an applied energy of 0.3 mJ / dot.
Next, printing with a foaming agent was possible at an applied energy of 0.9 mJ / dot.

[0022]

According to the present invention having the above-described structure,
The following effects are obtained. That is, a display recording medium capable of performing irreversible recording using a heating type foaming agent was obtained, together with reversible recording of the high molecular weight / low molecular weight type. By setting the foaming agent's foaming start temperature above the temperature range used for reversible recording and erasing with the foaming agent type and foaming auxiliary agent, reversible recording / erasing and irreversible display recording can be performed on the same medium. It is possible to perform irreversible recording only under necessary conditions using the same reading and writing machine.

[Brief description of the drawings]

FIG. 1 is a sectional view of a thermosensitive display recording medium according to an embodiment of the present invention.

FIG. 2 is a sectional view of a thermosensitive display recording medium according to an embodiment of the present invention.

FIG. 3 is a sectional view of a thermosensitive display recording medium according to an embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Plastic support 2 ... Coloring (reflection) layer 3 ... Recording layer 4 ... Foam layer 5 ... Protective layer 6 ... Adhesive layer 7 ... Card support

Continuation of front page (72) Inventor Toru Endo 1-5-1, Taito, Taito-ku, Tokyo Letterpress Printing Co., Ltd. F-term (reference) 2C005 HB01 HB04 HB09 JA01 JA26 JC02 JC03 KA01 KA06 KA25 KA37 KA48 KA70 LA02 LA11 LA26 LB08 2H111 HA07 HA18 HA23 HA35

Claims (3)

[Claims] 1. A reversible thermosensitive recording medium comprising a sheet and a reversible thermosensitive recording layer in which an organic low-molecular substance is dispersed in a resin base material, wherein a heating type foaming agent is dispersed in the reversible thermosensitive recording layer. A display recording medium characterized by the above-mentioned. 2. A thermosensitive recording medium having a reversible thermosensitive recording layer in which a low-molecular organic substance is dispersed in a resin base material on a sheet, wherein a foaming layer containing a heating type foaming agent is used as the reversible thermosensitive recording layer. A display recording medium characterized by being provided in an upper layer or a lower layer and a part of the upper layer or the lower layer. 3. A display recording medium, wherein the display recording medium according to claim 1 or 2 is integrated on the entire surface of a card support or on a part thereof.