JP6711073B2 - card - Google Patents

Description

The present invention relates to a card, and more specifically, an object of the present invention is to provide a card on which an arbitrary image is formed by a sublimation heat transfer method and which has excellent heat resistance of a printed matter.

In recent years, a wide variety of plastic cards have been used such as ID cards (employee ID, student ID, security card, etc.) that record personal information, bank cards, credit cards, transportation cards, health insurance cards, various membership cards, etc. Has been done. In order to recognize each of these cards individually, one side of them is recorded with textual information such as the owner's address and name, and for the purpose of preventing unauthorized use by anyone other than the owner's face. Image information such as photographs is recorded and used. Such personal information is usually recorded on the surface of the card after it has been formed into a card shape.

The information recording body of the card is manufactured using a thermal transfer sheet in consideration of the sharpness of image information and the convenience of printing character information. For example, a thermal transfer sheet having a color material layer such as yellow, magenta, and cyan provided on a substrate is used to record a color human image on a card, and then a thermal transfer sheet provided with a black color material layer is used. Then, the characters are recorded on the portion of the base material other than the portion on which the person image is formed. An image obtained using a thermal transfer sheet has excellent reproducibility and gradation of intermediate colors and can form a high-quality image comparable to a full-color photographic image. Recording bodies are generally manufactured using a thermal transfer sheet.

The information recording bodies of these cards are required to have high heat resistance such that images do not bleed even if they are left inside a car during a hot season. Conventionally, a vinyl chloride resin such as a vinyl chloride-vinyl acetate copolymer resin has been frequently used for the image receiving layer of a card (for example, Patent Document 1). However, the image-receiving layer using a vinyl chloride resin has a problem that it is insufficient for obtaining an image with high heat resistance required for cards.

Further, since the card has a required strength characteristic, the information recording surface is harder and less cushioning than the conventional thermal transfer image receiving sheet or image receiving paper, so that the image receiving layer has good surface quality and excellent printability. That is, it is required that the print density is sufficient and print missing or the like does not occur.
On the other hand, the image receiving layer is required to have good releasability from the thermal transfer sheet during printing. In recent years, with the increase in speed of printers, the image receiving layer at the time of printing is given a higher applied energy in a shorter time, and the thermal transfer sheet is peeled from the image receiving layer in a high temperature state at a high speed. Therefore, in a high speed printer, fusion is likely to occur. If the releasability is poor, when the dye layer and the image receiving layer cause heat fusion, or when peeling the dye layer from the image receiving layer, peeling marks are generated in the printed matter, and there are many cases where running defects occur, There was a problem in the process such that the quality of the printed matter was deteriorated due to heat fusion or peeling marks.
In order to improve releasability, a technique of adding a releasing agent such as silicone oil to the image receiving layer has been conventionally used. However, when a release agent such as silicone oil is added to the image receiving layer, there is a problem that an image having high heat resistance required for cards cannot be obtained.

Patent Document 2 describes that an image receiving layer of a thermal transfer receiving sheet contains a polyvinyl butyral resin having a degree of butyralization of 70 to 80 mol% and a molecular weight of 15,000 to 35,000. However, Patent Document 2 is a thermal transfer receiving sheet characterized in that a metal vapor deposition layer having a good dye barrier property is provided between the intermediate layer and the image receiving layer even if the film thickness is thin. Since the adhesiveness to the metal vapor deposition layer is good and it has an effect of preventing corrosion of the metal vapor deposition layer, the image receiving layer adjacent to the metal vapor deposition layer has a butyralization degree of 70 to 80 mol% and a molecular weight of 15,000 to 35,000. It is described that the polyvinyl butyral resin which is the above is selected, and the molecular weight is 35,000 or less so that the metal vapor-deposited layer is not peeled off (0002, 0031, 0032, 0033 of Patent Document 2).
Patent Document 2 is an invention relating to a substantially paper-based image-receiving paper (paragraph 0002 of Patent Document 2), in which a polyvinyl butyral resin and a releasing agent silicone oil are combined for the purpose of releasability from a thermal transfer sheet. It is used (Example of Patent Document 2). With the technique of Patent Document 2 as described above, as shown in a comparative example described later, an image having high heat resistance required for cards cannot be obtained.

Further, in Patent Document 3, a polyvinyl butyral resin is cited as an example of the binder for the image receiving layer in the method of manufacturing an IC card. However, the polyvinyl butyral resin here is one of the enumerated examples of the binder for the image receiving layer, and there is no suggestion to use the polyvinyl butyral resin from the list.

Further, Patent Document 4 describes an example in which the image-receiving layer of the image-receiving sheet contains a polyvinyl butyral resin (Eslec BX-1 manufactured by Sekisui Chemical Co., Ltd.) and a metal ion-containing compound. However, S-REC BX-1 (trade name, manufactured by Sekisui Chemical Co., Ltd.) is a polyvinyl acetal resin that is not butyralized. As shown in Comparative Examples described later, when such a polyvinyl acetal resin is used, there are problems that the surface quality of the image receiving layer is poor and the releasability is poor.

JP, 2001-205945, A JP, 2009-154399, A JP, 2009-48661, A JP, 2014-61668, A

The present invention has been made in view of the above-described problems, and has good surface quality and excellent printability, has good releasability from a thermal transfer sheet, and forms an image having excellent heat resistance. The purpose is to provide a card that can.

The card according to the present invention has a base material and an image receiving layer disposed on one surface of the base material, and the flexure amount in the bending strength test defined in JIS X 6305-1 is set to 35 mm or less. In the card,
The image receiving layer is a cured product of a resin composition containing a polyvinyl butyral resin having a number average molecular weight of 80,000 or less and a curing agent.

In the card according to the present invention, it is preferable that the polyvinyl butyral resin has a number average molecular weight of 35,000 or more from the viewpoint of excellent releasability.

According to the present invention, it is possible to provide a card capable of forming an image having good surface quality and excellent printability, good releasability from a thermal transfer sheet, and excellent heat resistance.

It is sectional drawing which shows an example of the card which concerns on this invention typically. It is sectional drawing which shows another example of the card which concerns on this invention typically. It is sectional drawing which shows typically the IC card which is another example of the card which concerns on this invention. It is a figure explaining the amount of deflections (h1-h2) in the test of bending strength prescribed by JIS X6305-1.

Next, embodiments of the present invention will be described in detail, but the present invention is not limited to the following embodiments, and various modifications can be carried out within the scope of the spirit thereof.
In addition, in the present invention, the “sheet” is meant to include a sheet and a film in the definition of JIS-K6900. According to the definition in JIS-K6900, a sheet is a flat product whose thickness is generally small in terms of length and width. A film is extremely small in thickness and width, and has a maximum thickness. A thin, optionally flat product, usually supplied in roll form. Therefore, it can be said that a film having a particularly thin thickness among the sheets is a film, but since the boundary between the sheet and the film is not clear and it is difficult to clearly distinguish it, in the present invention, the meaning of both the thick one and the thin one is meant. Including "," is defined as a "sheet".

The card according to the present invention has a base material and an image receiving layer disposed on one surface of the base material, and the flexure amount in the bending strength test defined in JIS X 6305-1 is set to 35 mm or less. In the card,
The image receiving layer is a cured product of a resin composition containing a polyvinyl butyral resin having a number average molecular weight of 80,000 or less and a curing agent.

The card according to the present invention, in which the image receiving layer is a cured product of a resin composition containing a polyvinyl butyral resin having a number average molecular weight of 80,000 or less and a curing agent, has good surface quality and excellent printability, and can be thermally transferred. An image having excellent releasability from the sheet and excellent heat resistance can be formed.

The polyvinyl butyral resin used in the present invention is a resin containing a hydroxyl group, which will be described in detail later, and can perform a crosslinking reaction with a curing agent that reacts with the hydroxyl group. In a cured product of a resin composition containing a polyvinyl butyral resin and a curing agent, the hydroxyl groups of the polyvinyl butyral resin are consumed by crosslinking to form a three-dimensional network structure.
A polyvinyl butyral resin having a number average molecular weight of 80,000 or less has excellent coating suitability and can form an image-receiving layer with good surface quality, and since the hydroxyl groups are consumed by cross-linking, the polarity is not too high and the dye is received from the thermal transfer sheet. It is easy to do. Therefore, it is presumed that the surface quality is good and the printability is excellent, the dye is sufficiently transferred from the thermal transfer sheet to the image receiving layer, and the print density is high.
Further, the mold releasability is improved because the cured product of the resin composition has a bulky butyral group, and the hydroxyl group is consumed by crosslinking to build a three-dimensional network structure and the surface hardness is high. It is estimated that the synergistic effect of By selecting a cured product of a resin composition containing a polyvinyl butyral resin having a number average molecular weight of 80,000 or less and a curing agent as the binder resin of the image receiving layer, the image receiving layer does not contain a releasing agent such as silicone oil. Can also ensure sufficient releasability.
Furthermore, the high heat resistance required for cards, such as the occurrence of bleeding in the image even when stored at high temperatures, can be achieved because the hydroxyl group of the polyvinyl butyral resin is consumed by crosslinking to construct a three-dimensional network structure. It is presumed that it is not necessary to include a releasing agent such as silicone oil which has high durability as an image receiving layer and deteriorates heat resistance.

The card of the present invention will be specifically described below with reference to the drawings.
FIG. 1 is a schematic cross-sectional view showing an example of a card 10 of the present invention, which has a structure including a base material 1 and an image receiving layer 2 arranged on one surface of the base material 1. In addition, as shown in FIG. 2, an intermediate layer 3 may be further disposed between the base material 1 and the image receiving layer 2.
3 is a cross-sectional view schematically showing an IC card which is another example of the card according to the present invention. FIG. 3 is a schematic cross-sectional view of the IC card 20 including the base material 11, the image receiving layer 12, and the intermediate layer 13. The base material 11 includes an IC module having a predetermined thickness between the first base material sheet member 15 and the second base material sheet member 15′. The IC module includes an antenna body 18, an IC chip 19, a reinforcing plate 21, and the like, which are provided in the inlet 17. Further, in the base material 11, the inlet 17 is arranged between the first base material sheet member 15 and the second base material sheet member 15′, and the members are laminated with the adhesives 16 and 16′ interposed. It has a laminated structure.

The card of the present invention is a card having a flexure amount of 35 mm or less in the bending strength test specified in JIS X 6305-1 from the viewpoint of card suitability.
Here, the amount of deflection in the bending strength test specified in JIS X6305-1 is in accordance with the standard of JIS X6322-1;2001 (JIS X6301:2005 8.1 "Static bending strength"). It can be obtained by performing the following test according to the test method of X6305-1:2010 5.7 and measuring the amount of deflection (h1-h2).
B) Hold the short side 3 mm on one side of the card and record the height h1 (mm) of the short side on the opposite side from the reference surface (FIG. 4A).
B) A load of 0.7 N is applied to the opposite short side 3 mm, and the height h2 (mm) from the reference surface of the opposite short side is recorded for 1 minute (FIG. 4B).
C) Remove the load, and after 1 minute, record the height h3 (mm) of the opposite short side from the reference surface.
D) Record the amount of deflection (h1-h2) (mm) and the amount of deformation (h1-h3) (mm).
Used equipment:
Metal straight scale TZ-RS15 (Calibration equipment list No. 1)
Metal straight scale TZ-RS60 (Calibration equipment list No. 2)
Stopwatch S056-4000 (Calibration equipment list No.4)
Thermo-hygrometer T&D TR-72U (Calibration equipment list No. 6)
Electronic non-automatic balance EK-1200i (calibration equipment list No. 5) made by A&D Co., Ltd.

From the point of card suitability, the card of the present invention may have a bending amount of 35 mm or less in the bending strength test specified in JIS X 6305-1, but the bending amount is 30 mm or less. It is preferably 25 mm or less. On the other hand, if the amount of deflection is too small, it may be difficult to handle. Therefore, the amount of deflection is preferably 15 mm or more, and more preferably 20 mm or more.

Hereinafter, the image receiving layer, the base material, the intermediate layer, and the other features that are characteristic of the present invention will be described in this order.

(Image receiving layer)
The image receiving layer in the present invention is for receiving the dye transferred from the thermal transfer sheet and maintaining the formed image. The image-receiving layer in the present invention is characterized by being a cured product of a resin composition containing a polyvinyl butyral resin having a number average molecular weight of 80,000 or less and a curing agent.
Since the image-receiving layer is a cured product of a resin composition containing a polyvinyl butyral resin having a number average molecular weight of 80,000 or less and a curing agent, it has good surface quality and excellent printability, and it is released from a thermal transfer sheet. It is possible to form an image having good heat resistance and excellent heat resistance.
The image receiving layer is preferably a cured product of a resin composition containing a polyvinyl butyral resin having a number average molecular weight of 80,000 or less and a curing agent that reacts with the hydroxyl groups of the polyvinyl butyral resin, and the hydroxyl group of the polyvinyl butyral resin. A three-dimensional network structure is constructed by including a crosslinked structure in which a hydroxyl group of the curing agent reacts with a reactive group and the hydroxyl group of the polyvinyl butyral resin is bonded to the curing agent.

<Polyvinyl butyral resin having a number average molecular weight of 80,000 or less>
The polyvinyl butyral resin used in the present invention is a polymer having a constitutional unit having a vinyl butyral group in the molecule. Among them, a polymer having a number average molecular weight of 80,000 or less, which includes a structural unit having at least a vinyl butyral group and a structural unit having a hydroxyl group, represented by the following chemical formula (I) is preferable.

(In the chemical formula (I), 1 is a mol% of a constitutional unit having a vinyl butyral group, and is represented by a mol% of a total of constitutional units derived from butyralized vinyl alcohol. m is a constitution derived from vinyl alcohol. Represents the mol% of the unit, n represents the mol% of the constitutional unit derived from vinyl acetate, both 1 and m are numbers greater than 0, and n may be 0).

The polyvinyl butyral resin is obtained by reacting polyvinyl alcohol with butyraldehyde for acetalization. When polyvinyl alcohol (PVA) is acetalized, it is difficult to completely acetalize PVA, and a hydroxyl group partially remains irreversibly. Therefore, the polyvinyl butyral resin contains a hydroxyl group.
Further, polyvinyl alcohol is usually produced by saponifying polyvinyl acetate, but since a small amount of acetyl groups often remain during saponification in the production process of polyvinyl alcohol, polyvinyl butyral resin has It is general that acetyl groups and hydroxyl groups partially remain irreversibly. Therefore, the polyvinyl butyral resin is usually a polymer having a number average molecular weight of 80,000 or less, which usually contains an acetyl group and has a constitutional unit having a vinyl butyral group, a constitutional unit having an acetyl group, and a constitutional unit having a hydroxyl group. Used.

As the polyvinyl butyral resin used in the present invention, a polymer having a number average molecular weight of 80,000 or less is selected and used. Since it is a polymer having a number average molecular weight of 80,000 or less, the coating suitability at the time of forming the image receiving layer becomes good, and the image receiving layer having good surface quality and excellent printability can be formed.
The number average molecular weight of the polyvinyl butyral resin used in the present invention is preferably 20,000 or more, more preferably 35,000 or more, still more preferably 45,000 or more from the viewpoint of releasability. It is preferable that the amount is 55,000 or more.
The number average molecular weight of the polyvinyl butyral resin used in the present invention can be measured by gel permeation chromatography (GPC). As a GPC apparatus, a GPC light scattering detector (“Model 270 (RALS+VISCO) manufactured by VISCOTEK”) is connected (Hitachi High-Tech “RI: L2490, Autosampler: L-2200, Pump: L-2130,” The number average molecular weight can be determined by using a column oven: L-2350, a column: GL-A120-S and GL-A100MX-S in series".

The polyvinyl butyral resin used in the present invention has a good butyralization degree of 60 mol because it has excellent printability, good releasability from a thermal transfer sheet, and can form an image having excellent heat resistance. % Or more, and more preferably 70 mol% or more. On the other hand, the degree of butyralization is preferably 90 mol% or less, more preferably 85 mol% or less, from the viewpoint of reactivity using a hydroxyl group.
Here, the degree of butyralization is the molar fraction obtained by dividing the amount of ethylene groups bonded with butyral groups by the total amount of ethylene groups in the main chain, and having the vinyl butyral group in the above formula (I). Corresponds to the mol% (l) of the constituent units. The amount of ethylene groups to which a butyral group is bonded can be measured using, for example, JIS K 6728 “Polyvinyl butyral test method”.

Further, the polyvinyl butyral resin used in the present invention has a hydroxyl group from the viewpoint that it has excellent printability, good releasability from a thermal transfer sheet, and can form an image with excellent heat resistance. The unit, that is, the constitutional unit (m) derived from vinyl alcohol is preferably 10 mol% or more, more preferably 15 mol% or more, and preferably 40 mol% or less, and 30 mol% or less. Is more preferable, and even more preferably 25 mol% or less.

In the polyvinyl butyral resin used in the present invention, the constitutional unit having an acetyl group, that is, the constitutional unit (n) derived from vinyl acetate is preferably 10 mol% or less, more preferably 6 mol% or less. Is preferred.
The polyvinyl butyral resin used in the present invention may further have a constitutional unit obtained by reacting polyvinyl alcohol with an aldehyde different from butyraldehyde to acetalize, as long as the effect of the present invention is not impaired. Such a structural unit is preferably 10 mol% or less.
Above all, in the chemical formula (I), the sum of l, m and n is preferably 100 mol %.

Further, as the polyvinyl butyral resin used in the present invention, while having excellent printability, it has good releasability from the thermal transfer sheet, and from the viewpoint that an image excellent in heat resistance can be formed, it has a glass transition temperature. (Tg) is preferably 50° C. or higher, more preferably 60° C. or higher. On the other hand, the glass transition temperature (Tg) is preferably 100° C. or lower, more preferably 90° C. or lower, because the print density may be lowered if the glass transition temperature (Tg) is too high.
The glass transition temperature (Tg) in the present invention is a temperature determined based on the measurement of the change in calorific value by DSC (differential scanning calorimetry) (DSC method).

As the polyvinyl butyral resin used in the present invention, a polyvinyl butyral resin having a number average molecular weight of 80,000 or less may be selected and used. Such a molecular weight and the amount of the above hydroxyl group are the degree of polymerization of the polyvinyl alcohol resin used and It can be appropriately adjusted by the butyralization reaction.

As the polyvinyl butyral resin, a commercially available product can be appropriately selected and used, and specific examples include Sekisui Chemical Co., Ltd., S-REC BH series, BL series, BM series, Kuraray Co., Ltd., trade name: Mobital ( Mowital) series and the like.

The polyvinyl butyral resin used in the present invention may be only one kind or two or more kinds.
The content of the polyvinyl butyral resin is preferably 70% by mass or more and 95% by mass or less (solid content conversion) of the entire image receiving layer material, and more preferably 80% by mass or more and 95% by mass or less. In addition, in this invention, "solid content" means all components other than a solvent.

<Curing agent>
The curing agent used in the present invention is one that crosslinks by utilizing the hydroxyl group contained in the polyvinyl butyral resin described above. Examples of the curing agent that reacts with the hydroxyl group used in the present invention include epoxy compounds, methylol compounds, isocyanate compounds, titanium chelate compounds and the like. In the present invention, as the curing agent to be combined with the polyvinyl butyral resin, a polyisocyanate compound is preferably used.

In the image-receiving layer of the present invention, in particular, from the viewpoint of heat resistance and releasability, the molar ratio of the reactive group that reacts with the hydroxyl group of the curing agent to the hydroxyl group of the polyvinyl butyral resin (reactive group of curing agent/OH) However, it is preferable to use the polyvinyl butyral resin and the curing agent in combination so as to be 0.01 or more and 5 or less, and further 0.1 or more and 3 or less.

The polyisocyanate compound used as the curing agent can be appropriately used as long as it is a compound having two or more isocyanate groups in the molecule. For example, at least one of aromatic polyisocyanate, aliphatic diisocyanate, alicyclic diisocyanate, araliphatic diisocyanate and derivatives thereof can be mentioned. Here, the araliphatic polyisocyanate refers to a polyisocyanate having a structure in which an isocyanate group is bonded to an aromatic ring via an aliphatic carbon atom.

As the aromatic polyisocyanate, 2,4-toluene diisocyanate, 2,6-toluene diisocyanate, or a mixture of 2,4-toluene diisocyanate and 2,6-toluene diisocyanate, 1,5-naphthalene diisocyanate, tolidine diisocyanate, Examples thereof include p-phenylene diisocyanate, triphenylmethane triisocyanate, tris(isocyanate phenyl)thiophosphate and the like.
Examples of the aliphatic polyisocyanate include hexamethylene diisocyanate, trimethylene diisocyanate, tetramethylene diisocyanate, pentamethylene diisocyanate, trimethylhexamethylene diisocyanate, and the like.
Examples of the alicyclic polyisocyanate include isophorone diisocyanate, dicyclohexylmethane diisocyanate, 1,3-bis(isocyanatomethyl)cyclohexane, and bis(isocyanatomethyl)norbornane.
Examples of the araliphatic polyisocyanate include xylylene diisocyanate, tetramethyl xylylene diisocyanate, ω,ω′-diisocyanate-1,4-diethylbenzene, and the like.
Examples of the derivative of the polyisocyanate compound include trimers such as isocyanurates of the polyisocyanate compound such as trimers, dimers and pentamers, and polyols such as the polyisocyanate compound and trimethylolpropane. Examples thereof include adduct bodies reacted with a compound, modified polyisocyanates such as alohanate bodies, and burette bodies.

In the present invention, from the viewpoint of light resistance among others, it is preferable to have a structure in which the nitrogen atom of the isocyanate group is bonded to an aliphatic carbon atom, an aliphatic diisocyanate, an alicyclic diisocyanate, an araliphatic diisocyanate and these. At least one of the derivatives is preferably used. Above all, from the viewpoint of light resistance and releasability, the isocyanurate body of the above-mentioned aliphatic polyisocyanate, xylylene diisocyanate and modified polyisocyanates thereof are preferably used.

In the image-receiving layer of the present invention, from the viewpoint of releasability, the molar ratio (NCO/OH) of the isocyanate group of the polyisocyanate compound to the hydroxyl group of the polyvinyl butyral resin is 0.01 or more and 5 or less. Further, it is preferable to use the polyvinyl butyral resin and the polyisocyanate compound in combination so as to be 0.1 or more and 3 or less.

The curing agent used in the present invention may be only one type, or two or more types.
The content of the curing agent that reacts with the hydroxyl group is preferably 5% by mass or more and 30% by mass or less (in terms of solid content) of the entire image receiving layer material, and more preferably 5% by mass or more and 20% by mass or less.

It can be confirmed by collecting and analyzing a material from the image receiving layer that the image receiving layer is a cured product of a resin composition containing a polyvinyl butyral resin and a curing agent. As the analysis method, NMR, IR, GC-MS, XPS, TOF-SIMS, and a combination of these methods can be applied.

<Other ingredients>
Other than the above, examples of any compound that can be added to the image receiving layer within the range that does not impair the effects of the present invention include, for example, antioxidants, ultraviolet absorbers, light stabilizers, fillers, pigments, antistatic agents, and plasticizers. Examples thereof include agents and heat-meltable substances.
The image-receiving layer of the present invention preferably contains no release agent such as silicone oil from the viewpoint of suppressing bleeding, but may be used as long as it does not impair the effects of the present invention. It does not prevent the use of molds. Examples of such a release agent include solid waxes such as silicone oil, polyethylene wax, amide wax, and Teflon (registered trademark) powder, and fluorine-based or phosphate-based surfactants.
Further, a binder resin other than the polyvinyl butyral resin having a number average molecular weight of 80,000 or less may be used in combination as long as the effect of the present invention is not impaired. Examples of such binder resin include polyvinyl butyral resin having a number average molecular weight of more than 80,000, other hydroxyl group-containing thermoplastic resin, acrylic group resin, polyester resin, urethane resin not corresponding to hydroxyl group containing thermoplastic resin. , Vinyl chloride resins and the like. Even when a binder resin other than a polyvinyl butyral resin having a number average molecular weight of 80,000 or less is used in combination, the polyvinyl butyral resin having a number average molecular weight of 80,000 or less is the main component of the binder resin, that is, 50% of the total amount of the binder resins. It is preferably at least 70% by weight, more preferably at least 70% by weight, and more preferably at least 90% by weight, based on the total weight of the binder resin.

When forming the image receiving layer, the coating amount of the coating liquid for the image receiving layer is not particularly limited, but is preferably 0.5 g/m ² or more and 10 g/m ² or less in a dried state.

(Base material)
As a base material used for the card of the present invention, in order to have card suitability, when a card having an image receiving layer described later is arranged, the amount of deflection in the bending strength test specified in JIS X 6305-1. A base material to be a card having a thickness of 35 mm or less is selected.
The base material used for the card of the present invention has a function of holding the image receiving layer, but since heat is applied during thermal transfer, it may have mechanical strength that does not hinder handling even in a heated state. preferable.

Among them, in the present invention, for example, a card substrate having an information recording function having a magnetic layer, an optical recording layer, an IC chip, etc., can be preferably used.

The card base material can be formed, for example, by bonding the second base material sheet member to the first base material sheet member with an adhesive using an appropriately known method. In addition, by embedding an electronic component composed of an IC chip that electrically stores user information and a coil-shaped antenna body connected to the IC chip in an adhesive, a card base material with an IC chip can be obtained. Can be formed. The card base material may be formed by providing an image receiving layer, which will be described later, on one surface side of the first base material sheet member and then bonding the second base material sheet member with an adhesive.

Examples of the base sheet member for forming the card base include polyester resins such as polyethylene terephthalate, polybutylene terephthalate, polyethylene terephthalate/isophthalate copolymers, polyolefin resins such as polyethylene, polypropylene and polymethylpentene, and nylon. 6, polyamide such as nylon 6.6, polyvinyl chloride, vinyl chloride/vinyl acetate copolymer, ethylene/vinyl acetate copolymer, ethylene/vinyl alcohol copolymer, polyvinyl alcohol, vinylon and other vinyl polymers, raw Degradable aliphatic polyester, biodegradable polycarbonate, biodegradable polylactic acid, biodegradable polyvinyl alcohol, biodegradable cellulose acetate, biodegradable resin such as biodegradable polycaprolactone, cellulose triacetate, cellophane, etc. Resins, acrylic resins such as methyl polymethacrylate, ethyl polymethacrylate, ethyl polyacrylate, butyl polyacrylate, etc., monolayers of polystyrene, polycarbonate, polyarylate, polyimide, etc., or two or more layers of these A laminated body is mentioned.
Examples of the laminate include a multilayer laminate sheet obtained by laminating two or more kinds of the base sheet members by a known method such as a dry laminating method, a wet laminating method, and a melt laminating method.
When the substrate has poor adhesion to the layer formed on the surface, it is preferable to subject the surface to an easy-adhesion treatment such as various primer treatments or corona discharge treatments.

The thickness of the base sheet member is 30 μm or more and 300 μm or less, preferably 50 μm or more and 200 μm or less. If the thickness of the base sheet member is too thin, heat shrinkage may occur when the base sheet members are attached to each other. In addition, you may perform the annealing process of the base material sheet member which reduces a thermal contraction rate.

Further, an easy contact treatment may be performed on the base material sheet member to improve adhesion in post-processing, and an antistatic treatment may be performed to protect the chip. As the base sheet member, specifically, U2 series, U4 series, UL series manufactured by Teijin DuPont Films Ltd., Crisper G series manufactured by Toyobo Co., Ltd., E00 series, E20 series, E22 series manufactured by Toray Industries, Inc. , X20 series, E40 series, E60 series and QE series can be preferably used.

When an adhesive is used for bonding to form a card substrate, a conventionally known adhesive can be used without particular limitation, but in the present invention, a hot melt adhesive or the like is preferably used. Examples thereof include ethylene/vinyl acetate copolymer (EVA) adhesives, polyester adhesives, polyamide adhesives, thermoplastic elastomer adhesives, and polyolefin adhesives. Of these, moisture-curable adhesives are preferable. In addition to the above-mentioned ones, the adhesives disclosed in JP-A-2000-036026, JP-A-2000-212178, and JP-A-2000-219855 are preferably used as the moisture-curable adhesive. You can In the case of bonding each member using an adhesive, the total thickness of the adhesive layer and the electronic component layer (thickness of the inlet) is preferably 100 μm or more and 600 μm or less, more preferably 150 μm or more and 500 μm or less, Particularly preferably, it is 150 μm or more and 450 μm or less.
In addition, as the adhesive, wax, thermoplastic resin, inorganic fine particles, leveling agent, rubber elastic particles, thermoplastic elastomer, thermoplastic resin, adhesive, curing agent, curing catalyst, leveling agent, tabular particles, needle-shaped Other additives such as particles may be included.

In the case of forming a card base material with an IC chip, a conventionally known material may be appropriately selected and used as an electronic component including an IC chip and a coil-shaped antenna body connected to the IC chip. Since the parts including the IC chip are placed in a predetermined position in advance and then the resin is filled, the joint portion is detached by the shearing force due to the resin flow, and the surface smoothness is caused by the resin flow and cooling. The inlet 17 is used in order to eliminate the loss and lack of stability. The inlet is a porous resin film, a porous foamable resin film, a flexible resin sheet for forming an electronic component in order to encapsulate a component in the resin layer by previously forming a resin layer on the substrate sheet. It is preferably used in the form of a porous resin sheet or a non-woven fabric sheet. As the resin sheet, polyethylene terephthalate (PET), PET-G, polyethylene naphthalate (PEN), vinyl chloride, polycarbonate, triacetyl cellulose, acrylic, etc. can be preferably used.
Further, since the IC chip 19 has a weak point pressure strength, a reinforcing plate 21 may be provided near the IC chip 19. As the reinforcing plate, a conventionally known one may be appropriately selected and used.
The total thickness of the electronic component including the inlet is preferably 100 μm or more and 600 μm or less, more preferably 150 μm or more and 500 μm or less, and particularly preferably 150 μm or more and 450 μm or less.

An adhesive is applied to one surface of the first and second sheet members or the front and back of an inlet (electronic component) to a predetermined thickness, and each member is bonded to produce a card base material. be able to. As a method of applying the adhesive, a conventionally known method such as a roller method, a T-die method, or a die method can be used, but the application method is not limited to these methods, and the adhesive is applied in a stripe shape. Or the coating methods proposed in JP-A-2000-036026, JP-A-2000-219855, JP-A-2000-212178, JP-A-10-316959, and JP-A-11-5964. In order to improve the surface smoothness of the sheet base material and the adhesiveness of electronic components provided between the first sheet member and the second sheet member when the respective members are bonded together, It is preferable to carry out heating and pressurization, and it is preferable to manufacture by a vertical pressing method, a laminating method and the like.

The base material may be formed as a laminated sheet or a continuous coating laminated roll formed as a continuous sheet by an adhesive bonding method or a resin injection method, and the sheet or the laminated roll is formed into a predetermined card size. A substrate having a desired size can be produced.
The thickness as a card base material, that is, the total thickness in the case of a laminated body, is not particularly limited as long as the deflection amount in the bending strength test specified in JIS X 6305-1 can be set to the above-mentioned suitable range, It may be selected appropriately. From the viewpoint of handleability, transportability, etc., it is usually appropriately selected within the range of 300 μm or more and 10 mm or less.
As a method of molding into a predetermined card size, a punching method, a cutting method and the like can be mainly adopted.

(Middle layer)
The intermediate layer 13 may be disposed between the base material 11 and the image receiving layer 12.
The intermediate layer can prevent the heat applied to the image receiving layer 12 from the thermal head from being transferred to the base material 11 and the like to be lost and the print density to be lowered. Further, the intermediate layer improves the cushioning property, reduces roughness, and makes it possible to obtain a high-density printed matter.
The intermediate layer may have a multi-layer structure in which two or more layers are laminated, and for the purpose of imparting adhesiveness between the heat insulating layer and the image receiving layer, whiteness, hiding power, antistatic property, anti-curl property and the like. It may be one.
As the intermediate layer, for example, all conventionally known layers such as “heat insulating layer”, “hollow layer”, “hollow particle layer” and “cushion layer” can be appropriately selected and used.

As the intermediate layer, for example, as described in JP 2013-28069 A, paragraphs 0017 to 0023, a styrene acrylic acid copolymer resin in hollow particles, and/or a binder such as gelatin that can be dispersed or dissolved in water. A cushion layer obtained by curing a resin with a hardener, an actinic ray curable layer described in JP-A-2014-193421, paragraphs 0027 to 0056, and a description of JP-A-2004-127135, paragraphs 0082 to 0092. Suitable examples thereof include an ultraviolet absorber-containing layer and a cushion layer.

The thickness or coating amount of the intermediate layer may be appropriately selected according to the purpose and is not particularly limited. The thickness of the intermediate layer is usually 0.5 μm or more and 10 μm or less, and the coating amount of the intermediate layer is preferably 0.5 g/m ² or more and 5 g/m ² or less in a dry state.

(Other configurations)
Further, a back surface layer having a function of improving the transportability of the card and a function of preventing curl can be provided on the surface of the base material different from the surface on which the image receiving layer is arranged.
The card used in the present invention is not limited to, for example, a writable writing layer and various other functional layers. As the back surface layer and the various functional layers, conventionally known layers may be appropriately selected and provided.

(Method of manufacturing printed matter)
A method for producing a printed matter using a card according to the present invention is characterized in that an image is formed by combining a thermal transfer sheet and a card having the specific image receiving layer, and a dye layer of the thermal transfer sheet. And the image receiving layer of the card are superposed, and heat is applied from the back layer side of the thermal transfer sheet by the thermal head to transfer the dye contained in the dye layer to the image receiving layer of the card to form an image. is there.

In the method for producing a printed matter using the card according to the present invention, by using a card in which the image receiving layer is a cured product of a resin composition containing a polyvinyl butyral resin having a number average molecular weight of 80,000 or less and a curing agent, It is possible to manufacture a card provided with a printed matter having high heat resistance and excellent heat resistance.

The energy applied from the substrate side of the thermal transfer sheet by the thermal head in the method for producing a printed matter according to the present invention may be appropriately adjusted according to the image and is not particularly limited, but in a high speed printer. Is, for example, output 0.25 W/dot or less, line speed 0.5 ms/L or more and 5 ms/L or less, dot density 200 dpi or more and 600 dpi or less, preferably output 0.20 W/dot or less, line speed 0.5 ms/L It is 2 ms/L or less, and the dot density is 200 dpi or more and 400 dpi or less.
According to the method for producing a printed matter using a card according to the present invention, since the above-mentioned specific card is used, high density printing can be realized even in the above high-speed printing.

Next, the present invention will be described more specifically with reference to Examples and Comparative Examples. In addition, "part" in a sentence is a mass reference|standard unless there is particular notice.
( Reference example 1)
On the base sheet (U2L92W-188, manufactured by Teijin DuPont Films Co., Ltd.), the image-receiving layer coating liquid 1 was applied at 4 g/m ² to form a coating film to form an image-receiving layer. Got
Another substrate sheet (U2L92W-188) is attached to the substrate sheet side of the obtained image-receiving sheet via a hot melt adhesive (Macroplast QR3460, manufactured by Henkel), and cosmetic cutting is performed using a roll cutter. Thus, a card 1 with an image receiving layer having a thickness of 790 μm and a card size of 55 mm×85 mm was produced.

<Coating liquid 1 for image receiving layer>
Polyvinyl butyral resin (S-REC BL-S, butyralization degree 74±3 mol%, number average molecular weight 23000, Tg=61° C., Sekisui Chemical Co., Ltd.) 8.5 parts Isocyanate (Takenate D-110N, Nippon Polyurethane Industry Co., Ltd.) ) 1.5 parts solvent (methyl ethyl ketone/toluene=1:1 (mass ratio) solution) 90 parts

( Reference example 2)
A card 2 with an image-receiving layer was produced in the same manner as in Reference Example 1 except that the image-receiving layer coating liquid 1 used in Reference Example 1 was changed to the image-receiving layer coating liquid 2 having the composition shown below.
<Coating liquid 2 for image receiving layer>
Polyvinyl butyral resin (S-REC BL-5, butyralization degree 77 mol% or more, number average molecular weight 32000, Tg=62° C., Sekisui Chemical Co., Ltd.) 8.5 parts Isocyanate (Takenate D-110N, Nippon Polyurethane Industry Co., Ltd.) 1.5 parts solvent (methyl ethyl ketone/toluene=1:1 (mass ratio) solution) 90 parts

(Example 3)
A card 3 with an image receiving layer was produced in the same manner as in Reference Example 1 except that the image receiving layer coating liquid 1 used in Reference Example 1 was changed to the image receiving layer coating liquid 3 having the composition shown below.
<Coating liquid 3 for image receiving layer>
Polyvinyl butyral resin (S-REC BM-S, butyralization degree 73±3 mol%, number average molecular weight 53000, Tg=60° C., Sekisui Chemical Co., Ltd.) 8.5 parts Isocyanate (Takenate D-110N, Nippon Polyurethane Industry Co., Ltd.) ) 1.5 parts solvent (methyl ethyl ketone/toluene=1:1 (mass ratio) solution) 90 parts

(Example 4)
A card 4 with an image receiving layer was produced in the same manner as in Reference Example 1 except that the image receiving layer coating liquid 1 used in Reference Example 1 was changed to the image receiving layer coating liquid 4 having the composition shown below.
<Coating liquid 4 for image receiving layer>
Polyvinyl butyral resin (S-REC BH-S, butyralization degree 73±3 mol %, number average molecular weight 66000, Tg=64° C., Sekisui Chemical Co., Ltd.) 8.5 parts Isocyanate (Coronate HX, Nippon Polyurethane Industry Co., Ltd.) 1 0.5 part solvent (methyl ethyl ketone/toluene=1:1 (mass ratio) solution) 90 parts

(Comparative Example 1)
The image receiving layer coating solution 1 used in Reference Example 1, except for changing the comparative image-receiving layer coating solution 1 having the composition shown below in the same manner as in Reference Example 1 to prepare an image-receiving layer with comparative card 1.
<Comparative image-receiving layer coating liquid 1>
Polyvinyl butyral resin (S-REC BH-3, butyralization degree 65±3 mol%, number average molecular weight 110000, Tg=71° C., Sekisui Chemical Co., Ltd.) 8.5 parts Isocyanate (Coronate HX, Nippon Polyurethane Industry Co., Ltd.) 1 0.5 part solvent (methyl ethyl ketone/toluene=1:1 (mass ratio) solution) 90 parts

(Comparative example 2)
An image-receiving layer-equipped comparative card 2 was produced in the same manner as in Reference Example 1 except that the image-receiving layer coating liquid 1 used in Reference Example 1 was changed to the comparative image-receiving layer coating liquid 2 having the composition shown below.
<Comparative image-receiving layer coating liquid 2>
Polyvinyl acetal resin (S-REC BX-1, butyralization degree 0 mol%, number average molecular weight 100,000, Tg=90°C, manufactured by Sekisui Chemical Co., Ltd.) 8.5 parts Isocyanate (Takenate D-140N, manufactured by Nippon Polyurethane Industry Co., Ltd.) 1 0.5 part solvent (methyl ethyl ketone/toluene=1:1 (mass ratio) solution) 90 parts

(Comparative example 3)
A comparative card 3 with an image receiving layer was prepared in the same manner as in Reference Example 1 except that the coating liquid 1 for image receiving layer used in Reference Example 1 was changed to the coating liquid 3 for comparative image receiving layer having the following composition.
<Comparison image receiving layer coating liquid 3>
・Vinyl chloride resin (vinyl chloride-vinyl acetate copolymer resin, Solvain C, Nisshin Chemical Industry Co., Ltd., number average molecular weight 31,000, Tg=87° C.) 20 parts ・Carboxyl-modified silicone oil (X-22-3701E, Shin-Etsu) Chemical Industry Co., Ltd. 1 part/solvent (methyl ethyl ketone/toluene=1:1 (mass ratio) solution) 80 parts

(Comparative example 4)
A comparative card 4 with an image receiving layer was produced in the same manner as in Reference Example 1 except that the coating liquid 1 for image receiving layer used in Reference Example 1 was changed to the coating liquid 4 for comparative image receiving layer having the composition shown below.
<Comparative image-receiving layer coating liquid 4>
・Vinyl chloride resin (vinyl chloride-vinyl acetate copolymer resin, Solvain C, Nissin Chemical Industry Co., Ltd., number average molecular weight 31,000, Tg=87° C.) 20 parts ・Solvent (methyl ethyl ketone/toluene=1:1 (mass ratio) ) Solution) 80 parts

(Comparative example 5)
For 100 parts of bleached hardwood kraft pulp beaten to Canadian Standard Freeness 300CC at a water temperature of 20°C, 0.4 parts of polyacrylamide (trade name: Polystron 117, manufactured by Arakawa Chemical Co., Ltd.), 1.0 part of baking soda , 1.2 parts of cationized starch (trade name: Cato-2, manufactured by Nippon NSC), 1.0 part of alkyl ketene dimer sizing agent (trade name: SPK903, manufactured by Arakawa Chemical Co., Ltd.), and 0. 3 parts of polyamide polyamine epichlorohydrin (trade name: WS-525, manufactured by Nippon PMC Co., Ltd.) was added, and a base paper having a basis weight of 180 g/m ² was produced from the obtained pulp slurry.
Further, a size press was applied to the base paper as a size press so that a 5% size liquid prepared by dissolving carboxyl group-modified PVA and sodium chloride in water at a weight ratio of 2:1 was applied to a coating amount of 1.5 g/m ^2. After coating, drying and calendering, a sheet-shaped support was obtained. The obtained sheet-shaped support had a thickness of 170 μm.
On the obtained sheet-shaped support, a coating solution for the intermediate layer having the following composition was applied so that the coating amount was 20 g/m ² , dried, and then smoothed by a gloss calendar. A support with an intermediate layer was obtained.
<Coating liquid for intermediate layer>
Pre-expanded hollow particles (average particle diameter 3.2 μm, volume hollowness 85%) composed of a copolymer containing acrylonitrile and methacrylonitrile as main components 45 parts Polyvinyl alcohol (trade name: PVA205, manufactured by Kuraray) 10 parts polybutadiene resin (Brand name: LX111, Tg=-80°C, manufactured by Zeon Corporation) 45 parts water 200 parts

The obtained support with an intermediate layer was dried so that the water content was 2%.
Next, the comparative image-receiving layer coating liquid 5 having the following composition was applied onto the intermediate layer so that the coating amount was 2 g/m ² , and dried, and then smoothed by a gloss calendar. , An image receiving sheet was obtained. The obtained image receiving sheet was cut into a size of 55 mm×85 mm to prepare a comparative sheet 5 with an image receiving layer.
<Comparative image-receiving layer coating liquid 5>
Polyvinyl butyral resin (S-REC BL-5, butyralization degree 77 mol% or more, number average molecular weight 32000, Tg=62° C., Sekisui Chemical Co., Ltd.) 100 parts Silicone oil (trade name: KF393, Shin-Etsu Chemical) 2 parts Isocyanate Compound (trade name: Takenate D-110N, manufactured by Nippon Polyurethane Industry Co., Ltd.) 6 parts Ethanol/methyl ethyl ketone=1/1 (mass ratio) solution 300 parts

(Comparative example 6)
In Reference Example 2, reducing the amount of hot melt adhesive (Macroplast QR3460, manufactured by Henkel), changing to a base sheet (25 μm PET) instead of the base sheet (U2L92W-188, Teijin DuPont Film), and changing the thickness. Comparative Example 6 with an image receiving layer was produced in the same manner as in Reference Example 2 except that the thickness was 350 μm.

[Evaluation]
(1) Bending strength test The flexural strength of the obtained card or sheet with an image-receiving layer in the bending strength test specified in JIS X6305-1 was measured.
Specifically, according to the standard of JIS X6322-1; 2001 (JIS X6301:2005 8.1 "Static bending strength"), the following test is performed according to the test method of JIS X6305-1:2010 5.7. I went. It was confirmed whether the deflection amount (h1-h2) was 35 mm or less.
B) Hold the short side 3 mm on one side of the card and record the height h1 (mm) of the short side on the opposite side from the reference surface (FIG. 4A).
(2) A load (F) of 0.7 N is applied to the opposite short side 3 mm, and the height h2 (mm) from the reference surface of the opposite short side is recorded for 1 minute (FIG. 4B).
C) Remove the load, and after 1 minute, record the height h3 (mm) of the opposite short side from the reference surface.
D) Record the amount of deflection (h1-h2) (mm) and the amount of deformation (h1-h3) (mm).
<< Equipment used >>
Metal straight scale TZ-RS15 (Calibration equipment list No. 1)
Metal straight scale TZ-RS60 (Calibration equipment list No. 2)
Stopwatch S056-4000 (Calibration equipment list No.4)
Thermo-hygrometer: T&D TR-72U (Calibration equipment list No. 6)
Electronic non-automatic balance: EK-1200i (calibration equipment list No. 5) manufactured by A&D Co., Ltd.
<Evaluation criteria for card suitability>
A: The amount of deflection (h1-h2) is 35 mm or less.
C: Deflection amount (h1-h2) is over 35 mm.

(2) Quality of image-receiving layer Regarding the obtained card or sheet with an image-receiving layer, the surface quality of the surface of the image-receiving layer was visually confirmed and evaluated.
<Evaluation criteria>
A: The surface quality is uniform C: The surface quality is non-uniform

(Image formation)
The ink side of the following sublimation type thermal transfer sheet is superposed on the surface of the image receiving layer of the obtained card or sheet with the image receiving layer and the output from the sublimation type thermal transfer sheet side is 0.23 W/dot and the line speed is 1.0 m using a thermal head. A gradation pattern was formed on the image receiving layer by heating under the conditions of a second/line and a dot density of 300 dpi to produce a printed matter.

≪Sublimation type thermal transfer sheet≫
A polyethylene terephthalate film having a thickness of 5 μm was used as a base sheet, and a coating solution for forming a heat-resistant primer layer having the following composition was applied to one surface of the base sheet by gravure printing so as to have a thickness of 1 μm after drying. After drying, a heat resistant primer layer was formed. Then, a heat resistant slipping layer coating solution having the following composition was applied onto the heat resistant primer layer by gravure printing so as to have a thickness of 1.0 μm after drying and dried to form a heat resistant slipping layer.
<Coating liquid for forming heat resistant primer layer>
-Water-dispersible polyurethane resin (Hydran AP-40N (manufactured by DIC Corporation)) 100 parts-Water 75 parts-IPA 25 parts <Heat resistant slipping layer forming coating liquid>
-Polyvinyl acetal (S-REC KS-1 manufactured by Sekisui Chemical Co., Ltd.) 60.8 parts-Polyisocyanate (Barnock D750 manufactured by Dainippon Ink and Chemicals, Inc.) 4.2 parts-Zinc stearyl phosphate (LBT-1830 purified) Sakai Chemical Industry Co., Ltd.) 10 parts Zinc stearate (SZ-PF Sakai Chemical Industry Co., Ltd.) 10 parts Polyethylene wax (Polywax 3000 Toyo Petrolite Co., Ltd.) 10 parts Methyl ethyl ketone 200 parts Toluene 100 parts On the other surface of the substrate sheet provided with the heat resistant primer layer and the heat resistant slipping layer, an easily adhesive layer obtained by curing an acrylic resin with a melamine crosslinking agent is formed with a thickness of 0.5 μm after drying. Then, a dye layer is formed on the easy-adhesion layer by gravure printing in the order of yellow, magenta, and cyan in the order of yellow, magenta, and cyan, using the dye layer coating liquids of the following compositions. Then, a thermal transfer sheet was produced. Each dye layer was formed to have a thickness of 1 μm when dried.
<Yellow dye layer coating liquid (Y)>
Disperse dye (Hollon Brilliant Yellow-S-6GL) 5.5 parts Binder resin (polyvinyl acetoacetal resin KS-5, Sekisui Chemical Co., Ltd.) 4.5 parts Phosphate ester surfactant (ply) Surf A208N, manufactured by Daiichi Pharmaceutical Co., Ltd. 0.1 parts Polyethylene wax 0.1 parts Methyl ethyl ketone 45.0 parts Toluene 45.0 parts <Magenta dye layer coating liquid (M)>
Disperse dye (MS Red G) 1.5 parts Disperse dye (Macrolex Red Violet R) 2.0 parts Binder resin (polyvinyl acetoacetal resin KS-5, Sekisui Chemical Co., Ltd.) 4.5 parts・Phosphate ester type surfactant (Prysurf A208N, manufactured by Daiichi Pharmaceutical Co., Ltd.) 0.1 part ・Polyethylene wax 0.1 part ・Methyl ethyl ketone 45.0 parts ・Toluene 45.0 parts <for cyan dye layer Coating liquid (C)>
-Disperse dye (Kayaset Blue 714) 4.5 parts-Binder resin (polyvinyl acetoacetal resin KS-5, manufactured by Sekisui Chemical Co., Ltd.) 4.5 parts-Phosphate ester surfactant (Prysurf A208N, Daiichi Pharmaceutical Co., Ltd. 0.1 parts-Polyethylene wax 0.1 parts-Methyl ethyl ketone 45.0 parts-Toluene 45.0 parts

(3) Releasability It was evaluated whether or not the thermal transfer sheet and the card or sheet with the image receiving layer could be peeled off manually after the printed matter was produced by the above image forming method.
<Evaluation criteria>
AA: The thermal transfer sheet could be lightly peeled from the card or sheet with the image receiving layer by hand.
A: The thermal transfer sheet could be manually peeled from the card or sheet having the image receiving layer.
B: The thermal transfer sheet could be manually peeled off from the card or sheet having the image receiving layer.
C: Not peelable Unevaluable: The surface quality of the image receiving layer was non-uniform and it was judged that the image had no evaluation value.

(4) Density In the image forming method described above, the card or sheet after the printed matter is produced is measured by an optical densitometer (spectrolino manufactured by Gretag Macbeth Co., Ltd. (Ansi-A, D65)) to obtain the maximum optical reflection density. The OD value (optical density) of black was measured.
<Evaluation criteria>
A: The OD value was 1.8 or more.
C: The OD value was less than 1.8.
Unevaluable: The surface quality of the image receiving layer was non-uniform, or peeling was impossible, and it was judged that the image had no evaluation value.

(5) Heat resistance 1
The card or sheet on which the printed matter was produced by the above-mentioned image forming method was placed in a dry oven at 60° C. and stored for 7 days.
(Evaluation criteria)
A: The image is clearly visible without bleeding. B: The image is bleeding and blurry. Unevaluable: The surface quality of the image receiving layer is not uniform, or peeling is impossible, and it is judged that the image has no evaluation value.

(6) Heat resistance 2
The card or sheet on which the printed matter was produced by the above-mentioned image forming method was placed in a 90° C. dry oven and stored for 4 days, and the bleeding of the image after storage was visually evaluated.
(Evaluation criteria)
A: The image appears clear without blurring. B: The image appears blurred with blurring C: Large undulations occur on the printed matter, and it is not worth evaluating the blurring.
Unevaluable: The surface quality of the image receiving layer was non-uniform, or peeling was impossible, and it was judged that the image had no evaluation value.

(7) Light resistance With respect to the card or sheet after the printed matter was produced by the above image forming method, the light resistance was evaluated by a xenon fade meter under the following conditions.
(I) Conditions for light resistance evaluation/irradiation tester: Ci4000 manufactured by Atlas
・Light source: Xenon lamp ・Filter: inner = CIRA, outer = soda lime ・ Black panel temperature: 45 (°C)
Irradiation ^{intensity: 1.2 (W / m 2)} -420 (nm) in the measurement-irradiation energy: ³⁰⁰ (kJ / m 2) integrated value at -420 (nm)

(Ii) Light resistance evaluation Next, the optical reflection density of the Cy component of the gray image was measured with a red filter using an optical densitometer (Macbeth RD-918 manufactured by Macbeth Co.), and the optical reflection density before irradiation was 1. For steps near 0, the change in optical density before and after irradiation was measured, the residual ratio was calculated by the following formula, and the light resistance of each thermal transfer image-receiving sheet was evaluated.
Residual rate (%)=(optical reflection density after irradiation/optical reflection density before irradiation)×100
(Evaluation criteria)
A: Residual rate 70% or more C: Residual rate less than 70% Unevaluable: The image quality of the surface of the image receiving layer was non-uniform, or peeling was impossible, and it was judged that the image had no evaluation value.

(8) Conveyability A card printer (CX-D80 manufactured by DNP) was used for conveyance, and the conveyability was evaluated.
<Evaluation criteria>
A: It is possible to convey without causing conveyance failure. C: Occurrence of conveyance failure cannot be evaluated.

1 Base Material 2 Image Receiving Layer 3 Intermediate Layer 10 Card 11 Base Material 12 Image Receiving Layer 13 Intermediate Layer 15 First Base Material Sheet Member 15′ Second Base Material Sheet Member 16, 16′ Adhesive 17 Inlet 18 Antenna Body 19 IC Chip 20 IC card 21 Reinforcing plate

Claims (1)

A card having a base material and an image-receiving layer disposed on one surface of the base material, and having a flexural amount in a bending strength test specified in JIS X 6305-1 of 35 mm or less,
The card, wherein the image-receiving layer is a cured product of a resin composition containing a polyvinyl butyral resin having a number average molecular weight of 45,000 or more and 80,000 or less and a curing agent.