JP2003136848A - Image receiving sheet for thermal transfer recording and ic card - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an image receiving sheet for thermal transfer recording which is excellent in the adhesive strength of a card base material to a coating layer and a dye accepting layer, dyeing properties, the transfer properties of a melt transfer ink, and processability and an IC card using the image receiving sheet. SOLUTION: In the image receiving sheet 1 for thermal transfer recording, a sheet-shaped support 2 contains a polyester resin 60-140 deg.C in softening point as a main component, a primer coat layer 3 and a dye accepting layer 4 are laminated in turn at least on one side of the support 2, and an evaluation value in a peeling test according to a cellophane adhesive tape peeling test method by a JIS K5400-1990/cross-cut tape method between the support 2 and the primer coat layer 3 is at least 6. The main component of the primer coat layer 3 is an aqueous polyurethane resin at least 85 mass % in gel content. The residual amount of an organic solvent in the image receiving sheet 1 is 50 ppm or below. The IC card 20 comprises the image receiving sheet 1, an IC module 7, and a back base material 5.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention is not only capable of forming a sheet into a sheet, and capable of forming a image by diffusively transferring a dye on the surface thereof, but also adding a softening and melting ink. The present invention relates to a thermal transfer recording image-receiving sheet capable of printing characters and the like clearly at high density by thermal transfer, and an IC card using the same.

[0002]

2. Description of the Related Art In recent years, thermal printers, especially thermal transfer printers capable of printing clear full-color images have been receiving attention. Among them, a sublimation heat transfer printer is a sublimation heat transfer dye sheet having a dye layer containing a dye that migrates by sublimation or melt diffusion by heating, and an image receiving sheet on which a dye receiving layer for receiving a dye is formed on one surface of a film substrate. And a predetermined amount of the dye in the dye layer is transferred onto the dye receiving layer by heat supplied from a thermal head or the like to form an image. This sublimation thermal transfer printer is characterized in that it is particularly advantageous for forming a high gradation photographic full color image.

On the other hand, in the fusion thermal transfer printer, a transfer film coated with an ink which is melted by heating (hereinafter referred to as "ink sheet") and an image receiving sheet are pressed against each other by a platen roll and heated from the back surface of the ink sheet. Then, the ink is instantly melted to form characters and images on the image receiving sheet. As a feature of printing by such a melt thermal transfer printer, since it is not a method of thermally diffusing ink, a sharp and highly concentrated image with an edge effect is obtained, and since a robust pigment type ink is used, Excellent image light resistance and chemical resistance. From the above, the melt thermal transfer printer is preferably used particularly for printing and printing character information.

By the way, among cards such as magnetic cards and IC cards, IDs such as membership cards and employee IDs
In card applications, it is preferable that image information such as a facial photograph is printed in order to recognize an individual. As a method of forming an image such as a photograph, the sublimation thermal transfer method is used for its gradation of photographs, operability of printing equipment,
Especially excellent due to high reliability. Therefore, the ID
In the printing of cards, first, a face photograph or the like is printed in full color by a sublimation heat transfer method, and then a character is clearly printed by a fusion heat transfer method.
It is possible to perform such different printing methods at the same time,
Sublimation / melt thermal transfer combined printers are already known.
In this printer, first, sublimable yellow,
The surface of the image-receiving sheet on which the dye-receiving layer is formed on the dye-coated surface of an ink sheet coated with a magenta or cyan dye and a heat-melt transferable ink (particularly black) (in some cases, a protective layer called an overlay layer). Overlap. Then, by the heat supplied from the thermal head, in response to the electrical signal corresponding to the desired image and characters,
Dyes and inks are transferred from a required portion to a predetermined amount of a predetermined amount on an image receiving sheet and dyed to form an image or a character.

Conventionally, a magnetic card utilizing magnetic characteristics has been used as an information recording medium, but in recent years, with the development of the IC card, the IC card becomes a large-capacity variable recording medium.
We are moving away from magnetic cards. IC cards are roughly classified into contact type and non-contact type. For contact IC cards,
Information is exchanged between the IC chip and an external data processing device via a contact terminal electrically and mechanically connected to the IC chip.

On the other hand, the non-contact type IC card is a transceiver that wirelessly communicates information with the outside through an antenna inside the card by radio waves. Since the communication means is a non-contact type using radio waves, it is not necessary to insert a magnetic card such as a commuter pass into a contact type reading device at a ticket gate of a station, and the IC card is kept in a bag or the like. It is possible to pass through the ticket gate. Further, since it is non-contact, there is no problem due to contact between the IC card and the reading device, for example, poor conveyance of the IC card, wear of the head of the reading device, etc., and the maintenance cost of the reading device can be significantly reduced. Is possible.

The IC card is provided between one of the front and back surface card bases formed of an electrically insulating resin film and these card bases, and is provided on one of these front surfaces. It is roughly composed of an electronic circuit such as an IC chip. Further, in the IC card, since the recording of the information on the IC chip incorporated therein is an electric recording, the I
Since a special writing change device is required to update the information of the C chip, it is also excellent in terms of confidentiality.

[0008]

Printing on the surface of an IC card is usually performed after the IC card is molded into a card shape having a final shape. If printing is performed before molding into a card mold, both of these base materials will shrink due to heating during the bonding of the card base materials, and the base material on the side where internal parts such as IC chips and antennas are mounted Due to the difference in shrinkage rate from the base material on the non-coated side, the positional relationship between the pattern printed on the surface of the IC card and the interior parts may shift.
For this reason, this IC card molding method is not suitable for printing small amounts and various types.

With a commercially available sublimation / melting type card printer,
Currently used card base materials are mainly card base materials containing polyvinyl chloride (hereinafter abbreviated as “PVC”) and polyethylene terephthalate (hereinafter referred to as “PET”) having a surface laminated with a PVC layer. It is abbreviated as ".) It is a card base material. In recent years, due to the problem of generation of dioxins due to waste incineration of a resin containing chlorine, there is an increasing demand for conversion to a non-chlorine card base material. However, as a substitute for the PVC card base material, there is no report of a non-chlorine resin having the same performance. For example, when a card substrate made of a general PET resin is used, the dyeability of the sublimable dye is poor and the transfer density of the melt heat transferable ink is low. In addition, since the general PET resin has a high softening point, it is difficult to process the card base material such as molding and laminating, and it cannot be laminated or used as a card base material by stacking without using an adhesive. It is also impossible to directly attach a magnetic stripe or hologram to the back surface by using the thermocompression bonding method. Therefore, when a magnetic stripe or a hologram is mounted on the surface of the card substrate, it is necessary to newly provide another layer capable of mounting these. Therefore, when a card base material composed of a plurality of resin layers is molded, the layer structure of the card base material is asymmetric with respect to the center of the thickness, and due to the difference in shrinkage rate and orientation of the resin forming each layer, Curling is likely to occur on the substrate, and it is difficult to control it.

Further, as a card base material containing a polyester resin as a main component, PET having a low softening point which is easy to mold has been proposed (JP-A-9-66590 and JP-A-11-100541). For example, a resin film containing 5 mol% or more of cyclohexanedimethanol residues and having a softening point of about 70 ° C. among residues derived from a polyhydric alcohol constituting a polyester resin has good processability and The curl is easy to control, and the physical properties such as heat-sealing property and repeated bending are close to those of PVC. However, this card substrate had a low dyeing property of the sublimable dye, and thus the transfer density of the transferred image was low.

Therefore, in order to impart a dyeing property to a card substrate having a low dyeing property, it has been attempted to directly provide a dye receiving layer containing a dyeing resin as a main component on the surface thereof. . 2. Description of the Related Art Conventionally, in order to obtain a high quality image, an image receiving sheet having a dye receiving layer which has a high dye transfer speed and a high transfer dyeing amount and has good storage stability has been developed. As such a dye-dyeable resin, various polyester resins, PVC resins, etc. have been proposed. For example, Japanese Patent Laid-Open No. 57-1078
No. 85 discloses a saturated polyester resin.
In Japanese Patent No. 3796, a sulfonated phthalic acid-modified polyester resin is proposed. Also, JP-A-63-7971
In the publication, a polyester resin composed of a phenyl group-containing polyol and a dicarboxylic acid is proposed. As described above, directly on the surface of the polyester base material having a relatively low softening point, when an attempt is made to form a dyeable resin using a solvent,
Problems such as deformation of the substrate due to the solvent are likely to occur.

The present invention has been made in view of the above circumstances, and has excellent adhesive strength between a card base material and an undercoat coating layer and a dye receiving layer, and also has dye dyeability and transferability of a melt heat transferable ink. An object of the present invention is to provide an image-receiving sheet for thermal transfer recording, which has good processability during card molding. Another object is to provide an IC card using the image receiving sheet for thermal transfer recording as a card substrate.

[0013]

[Means for Solving the Problems] The above-mentioned problems have a softening point of 6
A sheet-shaped support containing a polyester resin at 0 to 140 ° C. as a main component, an undercoat coating layer containing an aqueous polymer resin, and a dye receiving layer containing a dye-dyeing resin on at least one surface of the sheet-shaped support Is an image receiving sheet for thermal transfer recording, which is laminated in this order, between the sheet-shaped support and the undercoat coating layer, in accordance with JIS K5400-1990 / cellophane adhesive tape peeling test method by a cross-cut tape method. It can be solved by an image receiving sheet for thermal transfer recording having an evaluation score of 6 or more in a peeling test. Moreover, the said subject is a sheet-like support body which has a softening point of 60-140 degreeC as a main component, at least one surface of this sheet-like support body, the undercoating coating layer containing aqueous polymer resin, and dye dyeing. A thermal transfer recording image-receiving sheet in which a dye-receiving layer containing an adhesive resin is laminated in this order, and the main component of the undercoat layer is a gel fraction of 85 in a solvent in which toluene and methyl ethyl ketone are mixed in the same ratio. The problem can be solved by using an image-receiving sheet for thermal transfer recording which is a water-based polyurethane resin in an amount of at least mass%. It is preferable that the undercoat coating layer and the dye receiving layer are provided by a printing method or a coating method, and the residual amount of the organic solvent in the image receiving sheet is 50 ppm or less. A printing layer is preferably formed on the sheet-shaped support and / or on the undercoat coating layer provided on the sheet-shaped support.
An IC card comprising a front surface base material, an IC chip, and a back surface base material, wherein the front surface base material and / or the back surface base material is thermal transfer recording according to any one of claims 1 to 5. The problem can be solved by the IC card consisting of the image receiving sheet for use. Further, a surface base material, an adhesive layer, an IC chip,
An IC card provided with a backside substrate, wherein the frontside substrate and / or the backside substrate can be solved by an IC card comprising the above thermal transfer recording image-receiving sheet.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention is described in detail below.
FIG. 1 is a sectional view showing an example of an image receiving sheet for thermal transfer recording of the present invention. The image-receiving sheet 1 for thermal transfer recording contains a sheet-like support 2 containing a polyester resin having a softening point of 60 to 140 ° C. as a main component, and an aqueous polymer resin formed on at least one surface of the sheet-like support 2. The undercoat coating layer 3 and the dye receiving layer 4 containing the dye-dyeing resin formed on the undercoat coating layer 3 are roughly configured.

The softening point for forming the sheet-like support 2 is 60.
The polyester resin at 140 ° C is produced by the polycondensation reaction of dicarboxylic acid and diol. Dicarboxylic acid components include aromatic dicarboxylic acids such as terephthalic acid, isophthalic acid, orthophthalic acid, and 2,6-naphthalenedicarboxylic acid, and aliphatic dicarboxylic acids such as succinic acid, adipic acid, azelaic acid, sebacic acid, dodecadioic acid, and dimer acid. Acids, hexahydrophthalic acid, 1,
Examples thereof include alicyclic dicarboxylic acids such as 4-cyclohexanedicarboxylic acid, and one or more of these may be used alone or in combination. As the diol component, ethylene glycol, propylene glycol, 1,
3-propanediol, 1,4-butanediol, 1,
Aliphatic glycols such as 5-pentanediol, 1,6-hexanediol, diethylene glycol, dipropylene glycol and neopentyl glycol, 1,4-
Examples thereof include cycloaliphatic glycols such as cyclohexanedimethanol and 1,3-cyclohexanedimethanol, aromatic glycols such as 4,4′-dihydroxybiphenyl, and diol compounds having a bisphenol A skeleton. Two or more kinds are used alone or in combination. Preferably, the diol component is a mixture of ethylene glycol and cyclohexanedimethanol.

A polyester resin in which a part of the diol component is cyclohexanedimethanol is polycondensed by changing the mixing ratio of cyclohexanedimethanol, and the physical properties of the obtained polyester resin, for example, the softening point,
The crystallinity and heat resistance can be changed. By thus changing the blending ratio of the monomers and performing the polycondensation, it is possible to control the softening point of the polyester resin within a predetermined temperature range. In order to set the softening point of the polyester resin forming the sheet-shaped support 2 in the range of 60 to 140 ° C., among the residues derived from the polyhydric alcohol in the polyester resin (here, the polyhydric alcohol is diol), The cyclohexanedimethanol residue is preferably 5 mol% or more, more preferably 5 to 70 mol%, further preferably 10 to 50 mol%, and most preferably 25 to 40 mol%. When the cyclohexane dimethanol residue is less than 5 mol%, the softening point of the polyester resin cannot be set within the range of 60 to 140 ° C.

Particularly, when the diol component is composed of ethylene glycol and 1,4-cyclohexanedimethanol, 5 to 70 mol% of 1,4-cyclohexanedimethanol residues in the diol component and ethylene glycol residues are contained. Is preferably 95 to 30 mol%. More preferably, 10 to 50 mol% of 1,4-cyclohexanedimethanol residues, 90 to 50 mol% of ethylene glycol residues, and particularly preferably 25 to 40 mol% of 1,4-cyclohexanedimethanol residues. The ethylene glycol residue has a blending ratio of 75 to 60 mol%. The polyester resin as described above can also be obtained by polycondensing a dicarboxylic acid ester such as dimethyl dicarboxylate or a chloride with a diol. Specific examples of the polyester resin include, for example, DIAFIX PG-WHI and DIAFIX PG-WHT manufactured by Mitsubishi Plastics Chemical Co., Ltd., 100 mol% of dimethyl terephthalate as an acid component, and ethylene glycol 70 as a diol component. It is a polycondensate composed of mol% and 30 mol% of 1,4-cyclohexanedimethanol.

If the softening point of the polyester resin forming the sheet-like support 2 is 60 to 140 ° C., after the undercoat coating layer 3 and the dye receiving layer 4 are applied on the sheet-like support 2, It is preferable that unevenness and wrinkles do not occur on the sheet-shaped support 2 after drying, and that the sheet-shaped support 2 does not extend due to the tension during coating. When the softening point of the polyester resin forming the sheet-shaped support 2 is less than 60 ° C.,
Since the sheet-shaped support 2 is stretched by heating during processing and the temperature during drying cannot be increased, the adhesiveness between the sheet-shaped support 2 and the undercoat coating layer 3 and the dye receiving layer 4 is deteriorated. When the softening point exceeds 140 ° C., the workability of the sheet-shaped support 2 deteriorates and curling occurs.

Here, the softening point is a temperature at which the resin has a viscosity (ratio of stress to plastic flow velocity) of 10 ¹² P (poise), and if the resin is left at this temperature, it will flow within 10 seconds. Is the temperature. The measurement is based on JIS K7196, and can be measured in a static load control mode (F control mode) using a viscoelasticity measuring device DMS6100 manufactured by Seiko Instruments Inc., for example.

The following thermoplastic resin may be added to the polyester resin forming the sheet-shaped support 2. At this time, it is preferable to add the following thermoplastic resins to the polyester resin within a range that does not impair the effects of the present invention. As the thermoplastic resin added to the polyester resin, a resin having high compatibility with the polyester resin is preferable. For example, a polyester resin other than the polyester resin obtained by polycondensation of the above-mentioned dicarboxylic acid and diol, polyvinyl formal resin, polyacetal resin such as polyvinyl butyral, polyvinyl chloride resin, polyvinylidene chloride resin, polystyrene resin, acrylonitrile-styrene copolymerization Combined resin, polyethylene resin, polypropylene resin, polymethylmethacrylate resin, methylmethacrylate-styrene copolymer resin, polyamide resin, ethylcellulose resin, cellulose acetate resin, polycarbonate resin, polyurethane resin and the like can be mentioned, and one or two of these can be mentioned. The above is used alone or in combination. By adding these thermoplastic resins, the processability and heat resistance of the polyester resin are improved.

In the polyester resin forming the sheet-shaped support 2, inorganic oxides such as magnesium oxide, titanium oxide, aluminum oxide, calcium carbonate, magnesium carbonate, calcium silicate, barium sulfate, silicon oxide, magnesium carbonate, clay, talc, One type or two or more types such as silica may be contained. Further, the polyester resin, zinc stearate as a stabilizer and a lubricant, zinc laurate, metal soap such as zinc ricinoleate, a dispersant such as various surfactants, an antioxidant, an antistatic agent, a whitening agent, One or more kinds of various additives such as an ultraviolet absorber and a colored pigment may be contained.

The thickness of the sheet-like support 2 is not particularly limited, but is preferably 30 to 600 μm, more preferably 50.
Is 400 μm. Further, the sheet-shaped support 2 preferably has a smooth surface, and the dry mass thereof is 3
0 to 350 g / m ² is preferable.

The method of molding the sheet-shaped support 2 is not particularly limited, and can be appropriately selected from known methods and molded. For example, using a single or multi-layer T die or I die connected to a screw type extruder,
It can be molded by cast molding, calender molding, roll molding, inflation molding or the like in which a molten resin containing a polyester having a softening point of 60 to 140 ° C as a main component is extruded into a sheet shape.

By the way, a part of the ethylene glycol structure constituting the polyester resin is replaced with 1,4-cyclohexanedimethanol to obtain a polyester copolymer (PE
TG) can exhibit heat fusion property and physical properties as close to PVC as possible by changing the ratio of copolymerizing 1,4-cyclohexanedimethanol. Therefore, PETG is preferable as the sheet-shaped support 2 constituting the image-receiving sheet 1 for thermal transfer recording, and can be used as a PVC substitute material. Since the sheet-shaped support 2 made of PETG has physical characteristics close to that of PVC, it can be processed into a card by using the card processing machine used for processing a card base material made of PVC as it is. Furthermore, the softening point is 60 to 1 without impairing this advantage.
The resin forming the sheet-shaped support 2 may be a mixture of two or more resins within the range of 40 ° C. When using a plurality of resins, a known resin having good compatibility with the polyester resin such as another polyester resin or a polycarbonate resin is preferably used. When the polyester resin and the cyclohexanedimethanol resin are mixed and used, the blending amount of the cyclohexanedimethanol resin is 5 to 100% by mass, preferably 10 to 90% by mass of the total amount of the resin forming the sheet-shaped support 2. More preferably 15
-80% by mass. The resin forming such a sheet-like support 2 has good workability, does not contain chlorine like PVC as it does not generate a harmful gas during combustion, and has excellent heat-sealing characteristics, and thus has high adhesion strength. The obtained product also exhibits excellent performance in durability such as repeated bending.

The sheet-like support 2 having the above performance is
When used as a card base material that forms a front surface base material and / or a back surface base material such as an IC card, curling does not occur in the bonding step. Also, on the card substrate surface,
Magnetic stripes, holograms, sign panels, etc. can be uniformly thermocompression bonded. Further, in the thermal transfer recording image-receiving sheet 1, the sheet-like support 2 and the undercoat coating layer 3 are used.
The surface of the sheet-shaped support 2 may be subjected to corona discharge treatment in order to improve the adhesiveness and wettability with.

In the present invention, the thermal transfer recording image-receiving sheet 1 comprises a sheet-shaped support 2 and an undercoating layer 3 between which J
It is necessary that the evaluation score in the peeling test based on IS K5400-1990 / cellophane adhesive tape peeling test method by the cross-cut tape method is 6 or more.

Here, JIS K5400-1990 /
The evaluation method of the present invention according to the cellophane adhesive tape peeling test method by the cross-cut tape method will be described. This test penetrates the coating film formed on the test piece and makes a cut in a grid pattern that reaches the ground surface.Affix the adhesive tape on this grid pattern, and check the adhesion state of the coating film after peeling. It is a method of visually observing and evaluating the adhesion strength of the coating film. The outline is described below. In the present invention, the softening point is 60 to 140.
On a sheet-like support (150 mm × 70 mm) containing a polyester resin at 50 ° C. as a main component, for example, an undercoat layer,
After coating and drying, the test piece is left for one hour or more in the standard state. Next, a cutter guide having a plurality of slits formed at predetermined intervals is fixed to one center of the coating film formed on the test piece. Next, put a cutter knife in the slit of this cutter guide,
Keep a constant angle in the range of 35 to 45 degrees to the coated surface,
Pull the cutter knife along the slit to make a cut. At this time, the cut is drawn at a constant speed for about 0.5 seconds per cut so that the cut penetrates the coating film and reaches the base material of the test piece. In addition, always use a new blade edge of the cutter knife when making cuts. Repeat this operation,
Make a grid of cuts on the coating. Next, cellophane adhesive tape (width 18 mm or 24 mm, adhesive strength 2.94 N so that the length of the adhesive portion is about 50 mm on the cross-cut)
/ 10 mm or more. Generally, 3.0-4.5N
/ 10 mm. ) And rub with an eraser to completely adhere the tape to the coating. Next, 1-2 minutes after the tape is attached, one end of the tape is held at a right angle to the coated surface, and the tape is momentarily peeled off.

Next, the state of the coating film of the test piece after peeling off the cellophane adhesive tape is observed and evaluated. The evaluation criteria are shown below. The higher the score, the higher the strength of the coating film. (Evaluation score: 10) Each cut is thin and smooth on both sides, and the intersections of cuts and the squares are not peeled off at a glance. (Evaluation score: 8) There was a slight peeling at the intersection of the cuts, there was no peeling at every square, and the area of the defective portion was within 5% of the total square area. (Evaluation score: 6) There is peeling on both sides of the cut and the intersection, and the area of the defective portion is 5 to 15% of the total square area. (Evaluation score: 4) The width of peeling due to cuts is wide, and the area of the defective portion is 15 to 35% of the total square area. (Evaluation score: 2) The width of peeling due to cuts is wider than 4 points, and the area of the defective portion is 35 to 65% of the total square area. (Evaluation score 0) Peeling area is 65% of the total square area
that's all. Further, a dye receiving layer may be provided on the undercoat layer and evaluated in the same manner, and the evaluation judgment as an image receiving sheet including the undercoat layer and the dye receiving layer can be easily carried out. Generally, since the undercoat layer and the dye receiving layer have a sufficient adhesive force, it is possible to determine the degree of peeling between the undercoat layer and the sheet-shaped support. Furthermore, an image and a protective layer (overlamination layer) may be formed on the dye receiving layer for evaluation, and it becomes easy to obtain sufficient adhesive force with the test cellophane adhesive tape. Examples of the sheet-like support include Diafix PG-WHI (softening point 69 ° C.) and Diafix PG- manufactured by Mitsubishi Plastics Co., Ltd.
Good reproducibility is obtained when PETG film such as WHT (softening point 76 ° C.) is used.

The undercoat coating layer 3 is formed on at least one surface of the sheet-like support 2. The material forming the undercoat coating layer 3 contains a water-soluble or water-dispersible aqueous polymer resin as a main component. As the aqueous polymer resin, carboxymethyl cellulose, casein, dextrin, starch, modified starch, polyvinyl alcohol, modified polyvinyl alcohol, polyethylene oxide, polyvinyl pyrrolidone, polyvinyl methyl ether, polyacrylic acid, polyacrylamide, acrylic resin, polyester resin , Polyurethane resins and the like.
It is appropriately selected from these resins in consideration of solvent resistance and adhesiveness to the sheet-shaped support 2. In particular, when the main component of the material forming the undercoat coating layer 3 is an aqueous polyurethane resin having a gel fraction of 85% by mass or more with respect to a mixed solution obtained by mixing toluene and methyl ethyl ketone in the same ratio, the dye receiving layer 4 is coated. The sheet-like support 2 is not deteriorated by the organic solvent used in the working and printing. Further, since the amount of the organic solvent remaining on the thermal transfer recording image-receiving sheet 1 is 50 ppm or less, the sheet-shaped support 2 does not deteriorate. Further, since the undercoat coating layer 3 having such a constitution has good adhesiveness to the sheet-like support 2,
As a result, the thermal transfer recording image-receiving sheet 1 having good dyeing property and processability can be obtained.

In general, there are many water-based polymer resins that do not exhibit adhesive strength with respect to plastic sheets containing polyester resin as a main component. However, many water-based polyurethane resins exhibit a very good adhesive force even to the sheet-shaped support 2 containing such a lubricant. In addition, the adhesive strength of the water-based polyurethane resin is hardly reduced even with respect to a resin forming a hard layer containing a crosslinked structure or an aromatic (ring) in the structure. Therefore, the aqueous polyurethane resin is preferably used as the resin forming the undercoat coating layer 3.

The aqueous polyurethane resin is generally composed mainly of polyisocyanate and a compound (polyol) having an active hydrogen group. As the polyisocyanate, tolylene diisocyanate, diphenylmethane diisocyanate, polymethylene polyphenyl polyisocyanate, tolidine diisocyanate, naphthalene diisocyanate, hexamethylene diisocyanate,
Examples thereof include isophorone diisocyanate, xylylene diisocyanate, hydrogenated xylylene diisocyanate, and dicyclohexylmethane diisocyanate. Examples of the polyol include polyether polyols such as polypropylene glycol and polytetramethylene glycol, condensation type polyester polyols, lactone type polyester polyols, polyester polyols such as polycarbonate polyols, polybutadiene polyols, acrylic polyols and phenolic polyols.

When the gel fraction of the mixed solution of the above-mentioned aqueous polyurethane resin in which toluene and methyl ethyl ketone are mixed in the same ratio is less than 85% by mass, the undercoat coating layer 3 is inferior in solvent resistance. Therefore, when the dye receiving layer 4 is applied and printed on the undercoat coating layer 3, the sheet-like support 2 is deteriorated by the organic solvent used when the dye receiving layer 4 is applied and printed. Further, the dye-dyeability of the dye-receiving layer 4 deteriorates.

The gel fraction of the polymer resin (here, the aqueous polyurethane resin) with respect to the solvent is a value obtained by the following method. First, the film thickness after drying is 0.5 to 1.0 on a sheet made of polytetrafluoroethylene.
The solution of polymer resin is applied so that it becomes mm, and the temperature is 20 ° C.
And dried for 24 hours to form a polymer resin gel film.
Next, this coating is cut into 3 cm x 3 cm, immersed in a solution in which toluene and methyl ethyl ketone are mixed at the same ratio for 24 hours, dried at 120 ° C for 1 hour to completely evaporate the solvent, and the change in mass before and after immersion is measured. To do. Next, the gel fraction is calculated by the following formula. Gel fraction (%) = {mass after immersion (g) / mass before immersion (g)} × 100

The undercoat coating layer 3 may contain a pigment. When the undercoat coating layer 3 contains a pigment, the blocking resistance of the undercoat coating layer 3 is improved.
As the pigment to be contained in the undercoat coating layer 3, a usual inorganic or organic pigment can be appropriately used. For example, oxides, hydroxides, sulfides, carbonates, sulfates, silicate compounds of various metals such as magnesium, calcium, zinc, barium, titanium, aluminum, antimony and lead, polystyrene, polyethylene, polyvinyl chloride, etc. Solid polymer fine powders such as Of these, the use of inorganic pigments such as kaolin, talc, silica, gypsum, barite powder, alumina white, satin white, titanium oxide, and calcium carbonate improves the blocking resistance of the undercoat coating layer 3 and is preferable.

The amount of pigment contained in the undercoat coating layer 3 is
It is appropriately determined in consideration of the adhesiveness and solvent resistance of the undercoat coating layer 3, but is preferably 250% by mass or less, and more preferably 50% by mass based on the solid content with respect to the polymer resin forming the undercoat coating layer 3. It is 200 mass% or less. The pigment content is 250
When the content is more than mass%, the solvent resistance of the undercoat coating layer 3 becomes insufficient and the organic solvent may deteriorate the sheet-shaped support 2.

Further, in an organic solvent which dissolves the polymer resin forming the undercoat coating layer 3, polyhydric alcohols such as ethylene glycol, glycerin, trimethylolpropane and diethylene glycol, and polyalcohols such as polyethylene glycol and polypropylene glycol. Water-soluble plasticizers such as alkylene glycols, further inorganic salts, fillers, defoamers, wetting agents, leveling agents, curing agents, thickeners,
One or more of various additives such as a lubricant and a film-forming aid may be contained.

The thickness of the undercoat coating layer 3 is preferably 1 to 10 μm, more preferably 2 to 6 μm. Thickness is 1μ
If it is less than m, the solvent resistance is poor and the sheet-shaped support 2 may be deteriorated by the organic solvent. If the thickness exceeds 10 μm, the effect is saturated and it is uneconomical. In addition, the undercoat coating layer 3
The coating amount of is preferably 1 to 10 g / m ^{2 in} dry mass,
It is more preferably 2 to 6 g / m ² . If it is less than 1 g / m ^2, it is difficult to obtain sufficient tackiness with a substrate and solvent resistance. 1
Even if it exceeds 0 g / m ² , it will only be uneconomical.

The dye receiving layer 4 is formed on the undercoat coating layer 3 provided on at least one surface of the sheet-like support 2, and dyes a sublimable dye which is thermally transferred from an ink sheet (ink ribbon). , Containing a dye-dyeing resin to be fixed as a main component. Examples of the dye-dyeing resin forming the dye receiving layer 4 include polyester resin, vinyl chloride-vinyl acetate copolymer resin, polycarbonate resin, polyurethane resin, polyether resin, polyamide resin,
An acrylic resin, a cellulose derivative, etc. are mentioned.

It is preferable that the dye-dyeing resin forming the dye-receiving layer 4 is appropriately added with a crosslinking agent, a lubricant, a release agent and the like. By adding these, it is possible to prevent the thermal transfer recording image-receiving sheet 1 and the ink ribbon from being fused when the ink ribbon is heated by the thermal head to print on the dye receiving layer 4. In addition, additives such as antioxidants, pigments, and ultraviolet absorbers may be added to the dye-dyeing resin forming the dye-receiving layer 4 as needed. These various additives are mixed in advance with the polymer resin forming the dye receiving layer 4 to form the undercoat layer 3
It may be coated or printed thereon, or a coating layer comprising various additives may be formed on the dye receiving layer 4.

The thickness of the dye receiving layer 4 is preferably 1 to 12 μm, more preferably 2 to 8 μm. Thickness is 1μ
If it is less than m, the dye dyeability may be poor, the image quality of the image printed on the dye receiving layer 4 may be deteriorated, and the gloss of the printed screen may be deteriorated. When the thickness exceeds 12 μm, the dye receiving layer 4
Is too thick and uneconomical. The coating amount of the dye-receiving layer 4 is preferably 1~12g / m ² by dry weight, more preferably from 2 to 8 g / m ^2. When the coating amount is less than 1 g / m ² , the image quality of the image printed on the dye receiving layer 4 may deteriorate, and the gloss of the printed screen may deteriorate. Application amount is 12
When it exceeds g / m ² , the dye receiving layer 4 is too thick, which is uneconomical.

Undercoat coating layer 3 and dye receiving layer 4
Is formed on the sheet-shaped support 2 by a coating method or a printing method. In the coating method, various devices such as an air knife coater, a rod blade coater, a gravure coater, a bar coater, a blade coater, a roll coater, a size press coater, and a slot die coater are appropriately used. In the printing method, various printing devices used for screen printing, offset printing, gravure printing, etc. are appropriately used. In particular, when the undercoat coating layer 3 and the dye receiving layer 4 are partially formed on the sheet-like support 2, each layer can be formed at a predetermined position, and thus the printing method is preferable.

By the way, in an ID card typified by an IC card, common parts other than personal information are
Common characters and pictures are often printed on the card in advance. Image receiving sheet for thermal transfer recording 1
Then, a printing layer such as characters and pictures can be provided on any of the surface of the sheet-shaped support 2, the undercoat coating layer 3, and the dye receiving layer 4, which are mainly composed of a polyester resin. A lubricant or a release agent is often added to the dye receiving layer 4 as described above, and the dye receiving layer 4 may not adhere to the ink ribbon or the varnish coated to protect the surface thereof. is there. In such a case, it is preferable to form a printing layer on the sheet-shaped support 2 and / or the undercoat coating layer 3.

FIG. 2 is a sectional view showing an example of the IC card of the present invention. The IC card 20 is formed on the thermal transfer recording image-receiving sheet 1, which is a front surface substrate, the back surface substrate 5, and one surface 1a of the thermal transfer recording image receiving sheet 1, and is formed on the thermal transfer recording image receiving sheet 1 and the back surface substrate. Adhesive layer 6 to which material 5 is attached, IC module 7 held on one surface 6a side of adhesive layer 6, and exposed surface 4a of dye receiving layer 4 constituting image receiving sheet 1 for thermal transfer recording The sublimation dye layer 8 and / or the melt thermal transfer ink layer 9 and the protective layer 10 that protects the sublimation dye layer 8 and / or the melt thermal transfer ink layer 9 are roughly formed. Although the adhesive layer 6 is provided in this example, the adhesive layer 6 is omitted and the IC card 20 includes the thermal transfer recording image-receiving sheet 1 and the back substrate 5.
And the IC module 7 may be included.

As the back surface base material 5, a resin sheet having an insulating property is used. Examples of the resin sheet having an insulating property include PET resin, acrylonitrile-butadiene-styrene copolymer resin, polybutylene resin, polyvinyl chloride resin, and polycarbonate resin,
Further, paper, synthetic paper and the like can also be used, and one kind or two or more kinds thereof can be used alone or in combination.

The backside substrate 5 may be the thermal transfer recording image-receiving sheet 1 forming the frontside substrate. By using the same type of resin sheet for the front surface substrate and the back surface substrate, there is no difference in heat shrinkage in the bonding step between them, so that it is possible to obtain an IC card having no curl and a good appearance. it can.

As a material for forming the adhesive layer 6, an adhesive or a pressure-sensitive adhesive can be used. For example, urea resin, melamine resin, phenol resin, epoxy resin, vinyl acetate resin, vinyl acetate-acryl copolymer resin. , EVA resin, acrylic resin, polyvinyl ether resin, vinyl chloride-vinyl acetate copolymer resin, polystyrene resin, polyester resin, polyurethane resin, polyamide resin, chlorinated polyolefin resin, polyvinyl butyral resin Adhesives such as acrylic ester copolymer resins, methacrylic ester copolymer resins, natural rubber resins, cyanoacrylate resins, silicone resins, etc., or adhesive obtained by adding an appropriate tackifier to these adhesives. Agents. Further, additives such as a plasticizer, a filler and an anti-aging agent may be added to the above-mentioned adhesive or pressure-sensitive adhesive, if necessary.

In particular, when strong adhesive strength is required, among the above-mentioned adhesives or pressure-sensitive adhesives, chemically reactive adhesives of the type that cure or polymerize by a chemical reaction are preferably used. As the chemical reaction type adhesive, for example, thermosetting type such as epoxy resin and resol type phenol resin,
2-Cyanoacrylate ester resin, silicone resin, alkyl titanate resin, etc., moisture curing type, acrylic oligomer resin, etc., anaerobic curing type, epoxy resin
Addition reaction type such as polyurethane resin, UV curing type,
Radical polymerization type adhesives and the like can be mentioned.

The adhesive layer 6 is applied to the thermal transfer recording image-receiving sheet 1
As a method for forming on one surface 1a of one side or on one surface 5a of the back surface base material 5, for example, an adhesive or pressure-sensitive adhesive is applied on release paper in advance and dried, and then an image for thermal transfer recording is formed thereon. A method of laminating the sheet 1 or the backside substrate 5 and transferring the adhesive layer 6 onto the thermal transfer recording image-receiving sheet 1 or the backside substrate 5, an adhesive directly on the thermal transfer recording image-receiving sheet 1 or the backside substrate 5. Alternatively, there is a method of forming an adhesive layer 6 by applying a pressure sensitive adhesive and drying it. Preferably, a sheet-shaped hot melt adhesive is sandwiched and laminated between the image receiving sheet 1 and the back surface substrate 5. Moreover, the thickness of the adhesive layer 6 is appropriately set according to the thickness of the IC module.

The IC module 7 is not particularly limited, and one having a thickness of 50 to 500 μm is used. Normally, a substantially flat antenna coil (not shown) and one surface of this antenna coil are used. The IC chip (not shown) arranged so as to project in the direction is formed on a substrate (not shown). Then, both ends of the antenna coil are connected by anisotropic conductive tape (not shown), and the antenna coil and the IC are connected.
The tip and the chip remain electrically conductive. Further, the antenna coil may be a plate antenna formed on the substrate.

The substrate used for the IC module 7 may be a film or paper made of PET resin, polypropylene resin, polyethylene resin or the like and having a thickness of 20 to 100 μm. Then, as a method of forming the antenna coil on this substrate, a method of attaching a coil made of a wire such as silver or copper, a method of etching copper or aluminum into a coil shape, a coil using conductive ink or the like is used. There is a method of printing in a shape. As a method of forming the plate-shaped antenna, there are a method of printing using a conductive ink and a method of depositing a metal such as copper and aluminum. As an IC chip,
Usually, the length and width are 0.5-10 mm, and the thickness is 50-
The one having a thickness of about 300 μm is used.

The sublimation dye layer 8 and / or the molten thermal transfer ink layer 9 is formed by thermal transfer on the exposed surface 4a of the dye receiving layer 4 constituting the thermal transfer recording image receiving sheet 1. The sublimation dye layer 8 is formed by using a sublimation thermal transfer printer. The forming method is yellow, magenta, which migrates by sublimation or melt diffusion by heating,
A sublimation heat transfer dye sheet having a dye layer containing a cyan dye is superposed on the dye receiving layer 4, and a predetermined amount of the dye at a required portion of the dye layer is placed on the dye receiving layer 4 by heat supplied from a thermal head or the like. It is formed by transferring to. The melt heat transfer ink layer 9 is formed using a melt heat transfer printer. The formation method is as follows. An ink sheet coated with an ink that melts by heating is pressed onto the dye receiving layer 4 and heated from the back surface of the ink sheet,
Instantly melts thermal melt transfer ink (especially black),
It is formed by transferring onto the dye receiving layer 4. Also,
Using a sublimation / melt heat transfer combined printer, the dye coated surface of the ink sheet coated with the sublimable dye and the heat melt transfer ink is superimposed on the dye receiving layer 4, and the sublimation dye layer 8 and the melt heat transfer ink layer 9 are used. May be formed simultaneously.

A protective layer 10 may be formed on the sublimation dye layer 8 and / or the melt thermal transfer ink layer 9. As a material for forming the protective layer 10, polyester resin, acrylic resin, vinyl chloride-vinyl acetate copolymer resin, polyvinyl acetal resin such as polyvinyl butyral, cellulose resin such as cellulose acetate butyrate, SBR latex, NBR latex,
Acrylic emulsions, starches, aqueous resins such as polyvinyl alcohol, and the like can be mentioned. The material forming the protective layer 10 may contain an inorganic pigment such as clay, calcium carbonate, titanium dioxide, alumina hydroxide, satin white, silica, magnesium oxide, barium sulfate.

The method of forming the protective layer 10 is carried out by substituting the base material on the sublimation dye layer 8 and / or the molten thermal transfer ink layer 9 formed on the exposed surface 4a of the dye receiving layer 4 constituting the image receiving sheet 1 for thermal transfer recording. A transfer protective layer made of the above-mentioned resin is formed on top of the other, and by heating, the transfer protective layer is transferred onto the sublimation dye layer 8 and / or the molten thermal transfer ink layer 9 to form the protective layer 10. Method (hereinafter, also referred to as “transfer method”), or a method in which a transparent resin film is attached and laminated on the sublimation dye layer 8 and / or the melt thermal transfer ink layer 9 (hereinafter, also referred to as “adhesion method”). )and so on.

As a transfer method, a transfer protective layer is provided on an ink sheet coated with a sublimable dye and a heat-melt transfer ink, and after printing the sublimation dye layer 8 and / or the melt heat transfer ink layer 9 with a printer. Immediately, a method of transferring the transfer protection layer onto the sublimation dye layer 8 and / or the melt thermal transfer ink layer 9 to form the protection layer 10, a transfer protection layer provided on a resin film different from the ink sheet, After printing the sublimation dye layer 8 and / or the melt heat transfer ink layer 9, the transfer protection layer provided on the resin film is transferred onto the sublimation dye layer 8 and / or the melt heat transfer ink layer 9 by heating with a printer or the like, There is a method of forming the protective layer 10. The resin film used here is not particularly limited as long as it is a resin film generally used for an ink sheet, such as a PET film.

As a sticking method, a desktop laminator or the like is used on the sublimation dye layer 8 and / or the molten thermal transfer ink layer 9 formed on the exposed surface 4a of the dye receiving layer 4 constituting the image receiving sheet 1 for thermal transfer recording. Then, the transparent resin film is fused to form the protective layer 10 by heating, and a pressure-sensitive adhesive or an adhesive is applied on the sublimation dye layer 8 and / or the melt thermal transfer ink layer 9 in advance. There is a method in which a transparent resin film is attached via an adhesive to form the protective layer 10. As the transparent resin film, a transparent polyethylene-based film, an EVA-based film, a polyolefin-based film such as a polypropylene-based film, a PET-based film, or the like is preferably used because of its transparency and processability. Further, in order to improve the adhesiveness to the sublimation dye layer 8 and / or the molten thermal transfer ink layer 9, the transparent resin film may be subjected to known treatments such as anchor coat treatment, corona discharge treatment and antistatic treatment. .

A coating layer may be formed on the protective layer 10. As a material for forming this coating layer, polyester resin, acrylic resin, vinyl chloride-vinyl acetate copolymer resin, polyvinyl acetal resin such as polyvinyl butyral, cellulose resin such as cellulose acetate butyrate, SBR latex, NBR latex, Acrylic emulsions, starches, aqueous resins such as polyvinyl alcohol, and the like can be mentioned. The material forming the coating layer may contain an inorganic pigment such as clay, calcium carbonate, titanium dioxide, alumina hydroxide, satin white, silica, magnesium oxide, barium sulfate.

Further, it is preferable that the protective layer 10 and / or the coating layer described above is blended with an ultraviolet absorber which absorbs ultraviolet rays having a wavelength of 300 to 400 nm. Sublimation dye layer 8 printed by incorporating an ultraviolet absorber
It is possible to prevent the molten thermal transfer ink layer 9 from being deteriorated by ultraviolet rays. Examples of the ultraviolet absorber include benzophenone-based compounds, triazole-based compounds, salicylate-based compounds and the like, and these are appropriately selected and used. Further, a fluorescent dye, a fluorescent pigment, a phosphorescent pigment, or the like may be blended in the protective layer 10 and / or the coating layer. If these dyes and pigments are mixed, forgery of the IC card can be prevented.

In the IC card 20, a back surface coating layer may be formed on the exposed surface 5b of the back surface substrate 5. By forming the back cover layer, the IC card 2
It is possible to prevent static electricity from being generated at 0. In addition, when the IC cards 20 are placed one on top of the other, the surfaces of the sublimation dye layer 8 and / or the melt heat transfer ink layer 9 are prevented from being damaged by rubbing against each other, and the sublimation dye layer 8 and / or the melt heat transfer ink layer 9 are prevented from being damaged. It is possible to prevent the dye from migrating from the ink layer 9 to the IC card adjacent thereto. Furthermore, when the head of the printer travels on the surface of the sheet-shaped support body 2 that constitutes the IC card 20 during printing, it can travel smoothly, so that a high-quality image can be obtained.

Examples of the resin forming the back coating layer include acrylic resins, epoxy resins, polyester resins, phenol resins, alkyd resins, urethane resins, melamine resins, and reaction cured products of these resins. These resins are used to prevent damage to the surface of the adhesive, the sublimation dye layer 8 and / or the melt heat transfer ink layer 9, and to prevent migration of the dye and / or ink forming the sublimation dye layer 8 and / or the melt heat transfer ink layer 9. It is very effective.

Further, the back coating layer may contain various conductive agents in order to prevent static electricity. As the conductive agent, polyethyleneimine, an acrylic polymer containing a cationic monomer, a cation-modified acrylamide polymer, and a cationic polymer such as cationized starch are preferably used. The coating amount of the back surface coating layer is preferably 0.3 to 15 g / m ^{2 in} dry mass, more preferably 1 to
It is 10 g / m ² . When the coating amount is less than 0.3 g / m ² ,
It may not be possible to sufficiently prevent the surface of the sublimation dye layer 8 and / or the molten thermal transfer ink layer 9 from being damaged by rubbing against each other when the IC cards 20 are placed one on top of the other. When the coating amount exceeds 15 g / m ² ,
The effect is saturated and it is uneconomical.

An example of the method of manufacturing the IC card 20 will be shown below. First, one surface 1 of the thermal transfer recording image-receiving sheet 1
The adhesive layer 6 is formed on a. Next, an IC is formed on the adhesive layer 6.
While holding the module 7, the back surface base material 5 is overlapped. Next, a PET film for peeling is superposed on the surface of the thermal transfer recording image-receiving sheet 1, and the laminate is sandwiched between two metal plates. Next, the laminate sandwiched between the metal plates is provided in a hot press machine, and is pressure-bonded under a predetermined press condition (press temperature, press pressure, press time) to be bonded. After cooling to room temperature in the pressed state, the obtained laminated body is taken out and molded into a card mold with a punching machine to obtain an IC card. Next, the sublimation dye layer 8 and / or the melt thermal transfer ink layer 9 is thermally transferred onto the surface of the IC card by using a sublimation / melt thermal transfer combined printer, and then the protective layer 10 is thermally transferred to obtain an IC card 20. . In addition, after mounting the IC module 7 on one surface 5a of the back surface substrate 5, the image receiving sheet 1 for thermal transfer recording on which the adhesive layer 6 is formed is laminated, and hot pressed in the same manner as above to be molded. Good.

The conditions of the hot pressing can be appropriately set according to the material of the image receiving sheet 1 for thermal transfer recording and / or the back substrate 5, the type of the adhesive layer 6, the type of the IC module 7, and the like. Press temperature is 20 ° C to 250
Although it can be arbitrarily set between 0 ° C, the pressing temperature when the adhesive is not used as the adhesive layer 6 is preferably 60 to 200 ° C, and when the adhesive is used, it is preferably 20 to 100 ° C.

[0063]

EXAMPLES The effects of the present invention will be clarified below with reference to specific examples.

(Example 1) Highly concealed white PE made of terephthalic acid-ethylene glycol-cyclohexanedimethanol copolymer resin to which titanium oxide was added as a base material
TG film (trade name: Diafix PG-WHI,
A thickness of 200 μm, a general type, a softening point of 69 ° C., manufactured by Mitsubishi Plastics Co., Ltd. is prepared.
Was coated and dried so that the dry mass was 4 g / m ² , to form an undercoat coating layer. On the undercoat layer, (Coating-2) having the following composition was applied so that the dry mass was 4 g / m ^2, and dried to form a dye receiving layer, thereby obtaining an image-receiving sheet for thermal transfer recording. (Paint-1) Aqueous polyurethane resin (trade name: UX-125, gel fraction 93.4%, manufactured by Asahi Denka Kogyo Co., Ltd.) 100 parts by mass Butyl cellosolve-based wetting agent (trade name: Dapro U99, manufactured by San Nopco Co.) 0. 5 parts by mass (Paint-2) Polyester resin (trade name: Byron 200, manufactured by Toyobo Co., Ltd.) 100 parts by mass Silicone oil (trade name: KF393, manufactured by Shin-Etsu Silicon Co., Ltd.) 3 parts by mass Isocyanate (trade name: Takenate D-140N, Takeda Pharmaceutical Co., Ltd.) 5 parts by mass Toluene 300 parts by mass

Example 2 A highly hiding modified white PETG film (trade name: Diafix) consisting of a terephthalic acid-ethylene glycol-cyclohexanedimethanol copolymer resin to which titanium oxide was added as a base material and an aromatic polycarbonate resin. PG-WHT, thickness 100 μm, heat resistant type, softening point 76 ° C., manufactured by Mitsubishi Plastics Co., Ltd.) was used to form an undercoat coating layer and a dye receiving layer in exactly the same manner as in Example 1 to form a dye receiving layer. An offset printing machine (trade name: Lithrone 20, manufactured by Komori Co., Ltd.) was used in a part of the upper portion to form a printing layer of characters, patterns, etc., to obtain an image receiving sheet for thermal transfer recording.

Example 3 A highly hiding modified white PETG film (trade name: Trepalloy UW) comprising a terephthalic acid-ethylene glycol-cyclohexanedimethanol copolymer resin to which titanium oxide was added as a base material and an aromatic polycarbonate resin. -1A, thickness 100 μm, heat resistant type, softening point 128 ° C., manufactured by Toray Synthetic Film Co., Ltd.), and the same (paint-1) as in Example 1 was dried on one side so that the dry mass was 4 g / m ^2. After coating and drying, an undercoat coating layer was formed. An offset printing machine (trade name: Lithrone 20, manufactured by Komori Co., Ltd.) was used to form a printing layer of characters, patterns, etc. on the undercoat layer. Further, the same (paint-2) as in Example 1 was dried on the printed layer to give a dry mass of 4 g / m ^2.
Screen printer (Product name: PC-60
5) (manufactured by Tokai Shoji Co., Ltd.) and dried to form a dye receiving layer to obtain an image receiving sheet for thermal transfer recording.

(Example 4) Offset printing machine (trade name: Lithrone 20, manufactured by Komori Co., Ltd.) on one side of the same substrate as in Example 1
Was used to form a printing layer such as letters and patterns. A dry mass of (Paint-3) having the following composition is 4 g / on the printed layer.
m ² and so as to screen printing machine (trade name: PC-6
05, manufactured by Tokai Shoji Co., Ltd.) and printed to form an undercoat layer. The same (Paint-2) as in Example 1 was printed on this undercoat layer using a screen printing machine (trade name: PC-605, manufactured by Tokai Shoji Co., Ltd.) so that the dry mass was 4 g / m ^2. Then, the dye receiving layer was formed by drying to obtain an image receiving sheet for thermal transfer recording. (Paint-3) Aqueous polyurethane resin (trade name: UX-127, gel fraction 90.5%, manufactured by Asahi Denka Kogyo Co., Ltd.) 100 parts by mass Butyl cellosolve wetting agent (trade name: Dapro U99, manufactured by San Nopco Co.) 0. 5 parts by mass

(Comparative Example 1) An image-receiving sheet for thermal transfer recording was obtained in the same manner as in Example 1 except that (Paint-4) having the following composition was used for forming the undercoat layer. (Paint-4) Aqueous polyurethane resin (trade name: R9679, gel fraction 82.7%, manufactured by Abyssia) 100 parts by mass Butyl cellosolve wetting agent (trade name: Dapro U99, manufactured by San Nopco) 0.5 parts by mass

(Comparative Example 2) An image-receiving sheet for thermal transfer recording was obtained in the same manner as in Example 2 except that (Paint-5) having the following composition was used for forming the undercoat layer. (Paint-5) Aqueous polyurethane resin (Brand name: Hydran HW-960, gel fraction 77.6%, manufactured by Dai Nippon Printing Co., Ltd.) 100 parts by mass Butyl cellosolve-based wetting agent (Brand name: Dapro U99, manufactured by San Nopco) 0 0.5 parts by mass

(Comparative Example 3) An image receiving sheet for thermal transfer recording was obtained in the same manner as in Example 1 except that (Paint-6) having the following composition was used for forming the undercoat layer. (Paint-6) Aqueous acrylic resin (trade name: S-482, gel fraction 92.8%, manufactured by Mitsui Chemicals, Inc.) 100 parts by mass Butyl cellosolve-based wetting agent (trade name: Dapro U99, manufactured by San Nopco) 0.5 Mass part

(Comparative Example 4) An image receiving sheet for thermal transfer recording was obtained in the same manner as in Example 3 except that (Paint-7) having the following composition was used for forming the undercoat layer. (Paint-7) Aqueous acrylic resin (trade name: S-1318, gel fraction 94.5%, manufactured by Mitsui Chemicals, Inc.) 100 parts by mass Butyl cellosolve-based wetting agent (trade name: Dapro U99, manufactured by San Nopco) 0.5 Mass part

(Comparative Example 5) An image receiving sheet for thermal transfer recording was obtained in the same manner as in Example 4 except that (Paint-8) having the following composition was used for forming the undercoat layer. (Paint-8) Polyvinyl alcohol resin (trade name: PVA-105, gel fraction 88.7%, manufactured by Mitsui Chemicals, Inc.) 100 parts by mass Butyl cellosolve wetting agent (trade name: Dapro U99, manufactured by San Nopco) 0.5 Mass part

Comparative Example 6 An image receiving sheet for thermal transfer recording was obtained in the same manner as in Example 1 except that the polyester resin film produced by the following method was used as the substrate. PE
TG resin pellets (trade name: Easter DN003,
Cyclohexanedimethanol 65 mol%, ethylene glycol 35 mol%, dimethyl terephthalate 100 mol%
Of the polycondensate, softening point of 55 ° C., manufactured by Eastman Chemical Co., Ltd.) were vacuum dried, extruded from a T-die, cooled and solidified without stretching to obtain an unstretched polyester resin film. Next, this unstretched polyester resin film was heat-stretched vertically and horizontally so that the area ratio was 10 times, and then heat-set to obtain a biaxially stretched polyester resin film having a thickness of 100 μm.

COMPARATIVE EXAMPLE 7 A PET film having a thickness of 188 μm (trade name: Tetron film U298) was used as a base material.
An image receiving sheet for thermal transfer recording was obtained in the same manner as in Example 1 except that W, softening point of 200 ° C. or higher, manufactured by Teijin Limited) was used.

The following items were evaluated with respect to the thermal transfer recording image-receiving sheets obtained in Examples 1 to 4 and Comparative Examples 1 to 7. (1) The softening point of the base film is measured according to JIS K7196, and the softening point of the base film is measured by a viscoelasticity measuring device (model: DMS610).
0, manufactured by Seiko Instruments Inc., was used to measure in static load control mode (F control mode). First, 1
A substrate film sample having a size of cm × 4 cm was prepared. next,
The distance between the chucks was set to 2 cm, and the sample was set in the viscoelasticity measuring device. Next, the displacement of the substrate film in the temperature range of −20 to 200 ° C. was measured with a load of 100 g and a heating rate of 5 ° C./min. The relationship between the displacement of the substrate film and the temperature at this time was plotted as a displacement-temperature curve in which the vertical axis represents displacement and the horizontal axis represents temperature. Next, in this displacement-temperature curve,
The softening point is the intersection of the extension line that extends to the high temperature side on the straight line part on the low temperature side from the point where the base film begins to soften, and the extension line that extends the tangent line at the point of maximum displacement to the low temperature side. .

(2) Gel Fraction of Toluene / Methyl Ethyl Ketone Solution of Polymer Resin Forming Undercoat Coating Layer The gel fraction of the toluene / methyl ethyl ketone solution is a value obtained by the following method.
A solution of a polymer resin for forming an undercoat layer is applied onto a sheet of polytetrafluoroethylene so that the film thickness after drying is 0.3 to 0.5 mm, and the temperature is 50 ° C. for 24 hours. After drying, a polymer resin gel film was formed. Then, this coating is cut into 3 cm × 3 cm, immersed in a solution of toluene and methyl ethyl ketone mixed in the same ratio for 24 hours, and then dried at 105 ° C. for 3 hours to completely evaporate the solvent,
The change in mass before and after the immersion was measured. The gel fraction was calculated by the following formula (Equation 1). Gel fraction (%) = mass after immersion (g) / mass before immersion (g) x 100 (Equation 1)

(3) Cellophane adhesive tape peeling test by cross-cut tape method In accordance with JIS K5400 described above, a commercially available cellophane adhesive tape was used for the PETG film having the undercoat coating layer formed in each of Examples and Comparative Examples. The evaluation score was determined.

(4) Residual amount of solvent After coating the receiving layer for 1 minute at 120 ° C., the residual amount of toluene or methyl ethyl ketone in the thermal transfer recording image-receiving sheet was measured to determine the resistance of the thermal transfer recording image-receiving sheet. The solvent property was evaluated. If the solvent resistance is insufficient, white paper ruggedness may occur or the image storability may deteriorate. The evaluation criteria are as follows. ◯: Residual amount of solvent in the image receiving sheet for thermal transfer recording is 50 p
It was pm or less. Δ: The residual amount of solvent in the thermal transfer recording image-receiving sheet is 50 to 1
The amount was 00 ppm and was 50 ppm or less after card molding. X: The residual amount of solvent in the image receiving sheet for thermal transfer recording is 100 p
It was pm or more, and exceeded 50 ppm even after card molding.

(5) Blocking Resistance of Undercoat Coated Layer Two sheets were prepared using a film base material on which an undercoat coated layer cut into 10 cm × 10 cm was formed, and the sheets were mirror-finished on a stainless steel plate. The sheets were superposed so that the surface of the undercoat coating layer of one sheet and the back surface of the base material of the other sheet were in contact with each other. Next, a 10 cm × 10 cm mirror-finished stainless steel plate was placed on the superposed sheets, and a weight was placed on the stainless plate so that a load of 50 g was applied to 1 cm ^{2 of} the sheets. Then, in this state, the sheet was kept in an environment of a temperature of 50 ° C. and a relative humidity of 80% RH for 24 hours, and then the front surface of the undercoat coating layer and the back surface of the substrate were peeled by hand, and the degree of peeling was evaluated. did. The evaluation criteria are as follows. ◯: Peeled without any resistance. (Triangle | delta): There was resistance at the time of peeling, but no damage was observed on the surface of the undercoat coating layer. X: The surface of the undercoat coating layer was damaged during the peeling, and the undercoat coating layer could not be peeled at the interface between the undercoat coating layer and the back surface of the substrate.

(6) White Paper Appearance The white paper appearance of the thermal transfer recording image-receiving sheet was visually evaluated. The evaluation criteria are as follows. ◯: The thermal transfer recording image-receiving sheet had no defects and had a good appearance. Δ: The base material was slightly swollen by the solvent, and the thermal transfer recording image-receiving sheet had some irregularities. X: The base material swelled by the solvent, large irregularities were generated on the thermal transfer recording image-receiving sheet, and wrinkles were generated during drying.

(7) Printed state Commercially available thermal transfer color printer for card (trade name: NC
P100, Nozaki Printing Paper Co., Ltd. Ribbon: Yellow, Magenta, Cyan (sublimation) + Black (melting) + Overlamin, Nozaki Printing Paper Co. Thus, a predetermined image was thermally transferred to the undercoat coating layer and / or the dye receiving layer of the image-receiving sheet for thermal transfer recording, and a halftone single color of each color and a color superposed image were printed. The surface condition of the undercoat layer and / or the dye receiving layer was evaluated when the image was printed. The evaluation criteria are as follows. ◯: The undercoat coating layer and / or the dye receiving layer did not peel off when the image was printed. Δ: The undercoating layer and / or the dye receiving layer were slightly peeled off in the high density portion during printing of the image. X: The undercoat coating layer and / or the dye receiving layer were largely peeled off at the time of printing an image.

(8) Printing Curl A-6 size thermal transfer recording image receiving sheet was printed using a sublimation type video printer (trade name: CVP-M3, manufactured by Sony Corporation), and the thermal transfer recording image receiving sheet was flattened. When placed on top, the curl amounts of the four corners of the thermal transfer recording image-receiving sheet from the reference surface were measured. The evaluation criteria are as follows. ◯: The curl amount from the reference surface was less than 3 mm. Δ: The curl amount from the reference surface was 3 to 5 mm. X: The curl amount from the reference surface exceeded 5 mm.

(9) Printing density Thermal transfer color printer for card (commercial name: NC)
P100, manufactured by Nozaki Printing Paper Co., Ltd., ribbon: Yellow, magenta, cyan (sublimation) + black (melting) + over-lamination, manufactured by Nozaki Printing Paper Co., Ltd. Was thermally transferred to the image-receiving sheet for thermal transfer recording or the dye receiving layer of an IC card to record a halftone single color of each color and a color superposed image. About this recorded image, Macbeth reflection densitometer (trade name: RD-
914, manufactured by Macbeth Co.) was used to measure the reflection density at each applied energy, and the reflection density at the same applied energy was compared.

(10) Image storability Commercially available thermal transfer color printer for card (trade name: NC
P100, Nozaki Printing Paper Co., Ltd. Ribbon: Yellow, Magenta, Cyan (sublimation) + Black (melting) + Overlamin, Nozaki Printing Paper Co. As a result, a predetermined image was thermally transferred to the image-receiving surface for thermal transfer recording or the image forming surface of the IC card, and a halftone single color of each color and an image of color superposition were printed. This image shows a temperature of 60 ° C and a humidity of 85%.
It was stored for 14 days in a dark place under the environment of RH, and the print density, color tone and image bleeding of the image before and after storage were visually evaluated. The evaluation criteria are as follows. ◯: Almost unchanged before and after storage. Δ: There was some decrease in density and bleeding after storage. X: The density was greatly reduced after storage, and the image was extremely unclear due to bleeding. The evaluation results of (1) to (10) are shown in Table 1 above.

[0085]

[Table 1]

From the results shown in Table 1, it was confirmed that the thermal transfer recording image-receiving sheets of Examples 1 to 4 were excellent in solvent resistance, white paper appearance, printing condition, thermal transfer printability and the like.

Example 5 (Preparation of Inlet) An insulating substrate film (trade name: Tetron S, thickness 175 μm, material: polyethylene terephthalate, manufactured by Teijin Ltd.) was prepared. First, the back surface side of this insulating substrate film was coated with (Paint-9) having the following composition so as to have a dry mass of 1 g / m ^2, and dried to form an antistatic layer. Next, a 3-turn winding antenna and a circuit were produced on the surface side of the insulating base film by a screen printing method using a silver paste. I is placed at a predetermined position on the winding antenna or circuit via an anisotropic resin.
C chip (model number: SLE44R31, thickness 185 μm,
(Made by Siemens) is mounted by face bonding,
Got the inlet. (Paint-9) Acrylic resin (trade name: Ricabond SAR-615A, manufactured by Chuo Rika Co., Ltd.) 100 parts by mass Epoxy curing agent (trade name: Ricabond SAR-615B, manufactured by Chuo Rika Co., Ltd.) 5 parts by mass Conductive agent (trade name: ST2000H, manufactured by Mitsubishi Petrochemical Co., Ltd.) 75 parts by mass Silica pigment (trade name: P78A, manufactured by Mizusawa Chemical Co., Ltd.) 30 parts by mass (preparation of IC card) Terephthalic acid-ethylene glycol-cyclohexane to which titanium oxide is added as a back surface substrate. Highly concealed white PE made of dimethanol copolymer resin
TG film (trade name: Diafix PG-WHI,
A thickness of 100 μm, a general type, a softening point of 69 ° C., manufactured by Mitsubishi Plastics, Inc.) was prepared. Next, the back surface substrate, the sheet-shaped polyester adhesive, the inlet, the sheet-shaped polyester adhesive, and the thermal transfer recording image-receiving sheet of Example 1 as the surface substrate were laminated in this order. Next, a transparent PET film (trade name: S-
3, the thickness was 100 μm, manufactured by Teijin Ltd., and the laminate was sandwiched between matte-finished stainless steel plates and held at a pressing temperature of 120 ° C. and a pressure of 5 kgf / cm ² for 10 minutes to bond them. Next, the laminated body laminated is cooled to room temperature, the PET film and the stainless steel plate are peeled off, and the obtained laminated body is formed into a card shape (length 55 mm × width 85 mm) by a punching machine, and a non-contact type IC card. Got The thickness of the obtained IC card was 780 μm.

(Example 6) A non-contact type IC card was obtained in the same manner as in Example 5 except that the image receiving sheet for thermal transfer recording of Example 2 was used as the surface substrate. The thickness of the obtained IC card was 720 μm.

Example 7 A non-contact type IC card was obtained in the same manner as in Example 5 except that the thermal transfer recording image-receiving sheet of Example 3 was used as the surface substrate. The thickness of the obtained IC card was 720 μm.

(Example 8) A non-contact type IC card was obtained in the same manner as in Example 5 except that the image receiving sheet for thermal transfer recording of Example 4 was used as the surface substrate. The thickness of the obtained IC card was 720 μm.

(Comparative Example 8) A non-contact type IC card was obtained in the same manner as in Example 5 except that the image receiving sheet for thermal transfer recording of Comparative Example 1 was used as the surface substrate. The thickness of the obtained IC card was 720 μm.

Comparative Example 9 A non-contact type IC card was obtained in the same manner as in Example 5 except that the thermal transfer recording image-receiving sheet of Comparative Example 2 was used as the surface substrate. The thickness of the obtained IC card was 720 μm.

(Comparative Example 10) A non-contact type IC card was obtained in the same manner as in Example 5 except that the thermal transfer recording image-receiving sheet of Comparative Example 3 was used as the surface substrate. The thickness of the obtained IC card was 720 μm.

Comparative Example 11 A non-contact type IC card was obtained in the same manner as in Example 5 except that the thermal transfer recording image-receiving sheet of Comparative Example 4 was used as the surface substrate. The thickness of the obtained IC card was 720 μm.

Comparative Example 12 A non-contact type IC card was obtained in the same manner as in Example 5 except that the image receiving sheet for thermal transfer recording of Comparative Example 5 was used as the surface substrate. The thickness of the obtained IC card was 720 μm.

Comparative Example 13 A non-contact type IC card was obtained in the same manner as in Example 5 except that the image receiving sheet for thermal transfer recording of Comparative Example 6 was used as the surface substrate. The thickness of the obtained IC card was 720 μm.

(Comparative Example 14) A non-contact type IC card was obtained in the same manner as in Example 5 except that the image transfer sheet for thermal transfer recording of Comparative Example 7 was used as the surface substrate. The thickness of the obtained IC card was 720 μm.

With respect to the IC cards obtained in Examples 5-8 and Comparative Examples 8-14, the following items were evaluated. Regarding the print density and the image storability, the methods described in (9) and (10) above were performed, and almost the same results as those of the corresponding image receiving sheet were obtained. Further, an image obtained in the same manner as in the above item (9) and an IC having an overlay layer
For the card, a commercially available cellophane adhesive tape was adhered on the overlamination layer and a peeling test was conducted in accordance with the above (3), and the degree of peeling between the sheet-shaped support and the undercoat layer was observed, and the evaluation results are shown. Shown in 2. (11) Curl Before printing on the surface of the IC card, the state of curl on the surface of the IC card was visually evaluated. The evaluation criteria are as follows. ◯: No curl and good appearance. X: Large curl occurred and the appearance was poor.

(12) Appearance of card The appearance of a blank sheet of an IC card was visually evaluated. The evaluation criteria are as follows. ◯: The IC card had no defects and had a good appearance. X: The front substrate and / or the rear substrate was expanded by the solvent to cause irregularities on the IC card, and wrinkles were generated during drying. The evaluation results of (11) and (12) are shown in Table 2 above.

[0100]

[Table 2]

From the results shown in Table 2, it was confirmed that the IC cards of Examples 5 to 8 were excellent in processability, curl, thermal transfer printability and the like.

[0102]

As described above, the image-receiving sheet for thermal transfer recording of the present invention comprises a sheet-like support containing a polyester resin having a softening point of 60 to 140 ° C. as a main component, and at least one surface of the sheet-like support. A thermal transfer recording image-receiving sheet in which an undercoat coating layer containing an aqueous polymer resin and a dye receiving layer containing a dye-dyeing resin are laminated in this order, wherein the sheet-shaped support and the undercoat coating layer are provided. Between and JIS
Since the evaluation score in the peel test based on the K5400-1990 / cellophane adhesive tape peel test method by the cross-cut tape method is 6 or more, the dyeing property of the sublimable dye and the transfer property of the melt heat transfer ink are excellent. The print density is high, an image with good image quality is obtained, and curl hardly occurs. The thermal transfer recording image-receiving sheet of the present invention comprises a sheet-like support containing a polyester resin having a softening point of 60 to 140 ° C. as a main component, and an undercoat containing an aqueous polymer resin on at least one surface of the sheet-like support. A thermal transfer recording image-receiving sheet in which a coating layer and a dye receiving layer containing a dye-dyeing resin are laminated in this order, the main component of the undercoating layer is a solvent prepared by mixing toluene and methyl ethyl ketone in the same ratio. Since it is an aqueous polyurethane resin having a gel fraction of 85% by mass or more, the polyester resin film is not deteriorated by the organic solvent used for coating and printing the dye receiving layer. Further, since this undercoat coating layer has good adhesiveness to the sheet-like support, it is possible to obtain a thermal transfer recording image-receiving sheet having good dye-dyeability and processability. When the undercoat coating layer and the dye receiving layer are provided by a printing method or a coating method and the residual amount of the organic solvent in the image receiving sheet is 50 ppm or less, the polyester resin film is not deteriorated. If the print layer is formed on the sheet-shaped support and / or the undercoat coating layer provided on the sheet-shaped support, the print layer is difficult to peel off. Further, the IC card of the present invention is an IC card including a front surface substrate, an IC chip, and a back surface substrate, and the front surface substrate and / or the back surface substrate is the image transfer sheet for thermal transfer recording. If it is composed of, it is excellent in workability and thermal transfer printability. Also,
The printing surface is robust, has a high print density, and is clear without bleeding. The IC card of the present invention is an IC card including a front surface base material, an adhesive layer, an IC chip, and a back surface base material, wherein the front surface base material and / or the back surface base material is
Since it comprises the above-mentioned thermal transfer recording image-receiving sheet, it has excellent processability, thermal transfer printability, and the like. Also, it is difficult for irregularities and wrinkles to occur on the back surface substrate.
Further, when the IC card is used, the front surface substrate and the back surface substrate are not separated from each other, so that no problem occurs in the IC chip.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing an example of a thermal transfer recording image-receiving sheet of the present invention.

FIG. 2 is a sectional view showing an example of an IC card of the present invention.

[Explanation of symbols]

1 ... Image receiving sheet for thermal transfer recording, 2 ... Sheet-like support,
3 ... Undercoat coating layer, 4 ... Dye receiving layer, 5 ... Backside substrate, 6 ... Adhesive layer, 7 ... IC module, 8 ... Sublimation dye layer, 9. ..Melting heat transfer ink layer, 10 ... Protective layer, 2
0 ... IC card

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Hideaki Shinohara             Made by Oji 1-10-6 Shinonome, Koto-ku, Tokyo             Paper Co., Ltd. Shinonome Research Center F-term (reference) 2C005 HA03 HB01 JA01 JB02 JB11                       JB22 MA04 MB01 NA02 NA08                       PA01 PA21 PA23 RA04 RA09                       RA10                 2H111 CA03 CA04 CA25 CA33 DA01                       DA06                 5B035 BA03 BB09 CA01 CA06

Claims (6)

[Claims] 1. A sheet-shaped support containing a polyester resin as a main component having a softening point of 60 to 140 ° C., an undercoat coating layer containing an aqueous polymer resin, and a dye dyeing on at least one surface of the sheet-shaped support. An image-receiving sheet for thermal transfer recording, comprising a dye-receiving layer containing a photosensitive resin, which is laminated in this order, wherein the sheet-like support and the undercoat coating layer meet JIS K
5400-1990 / An image-receiving sheet for thermal transfer recording, which has an evaluation score of 6 or more in a peeling test based on a cellophane adhesive tape peeling test method by a cross-cut tape method. 2. A sheet-shaped support containing a polyester resin as a main component having a softening point of 60 to 140 ° C., an undercoat coating layer containing an aqueous polymer resin and a dye dyeing on at least one surface of the sheet-shaped support. Is a thermal transfer recording image-receiving sheet in which a dye-receptive layer containing a hydrophilic resin is laminated in this order, and the main component of the undercoat layer is a gel fraction of 85% by mass with respect to a solvent in which toluene and methyl ethyl ketone are mixed in the same ratio. % Of an aqueous polyurethane resin, an image-receiving sheet for thermal transfer recording. 3. The undercoat coating layer and the dye receiving layer are provided by a printing method or a coating method, and the residual amount of the organic solvent on the image receiving sheet is 50 ppm or less. An image-receiving sheet for thermal transfer recording according to 1 or 2. 4. The printing layer is formed on the sheet-shaped support and / or on the undercoat coating layer provided on the sheet-shaped support. An image-receiving sheet for thermal transfer recording according to any one of the items. 5. An IC card comprising a front surface base material, an IC chip, and a back surface base material, wherein the front surface base material and / or the back surface base material is any one of claims 1 to 4. Of an image receiving sheet for thermal transfer recording
card. 6. An IC card comprising a front surface base material, an adhesive layer, an IC chip, and a back surface base material, wherein the front surface base material and / or the back surface base material is any one of claims 1 to 4. An IC card comprising the image-receiving sheet for thermal transfer recording according to any one of 1.