JP2010229286A - Core substrate sheet for card and information recording medium - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a core substrate sheet for a card, exhibiting excellent adhesivity to toner regardless of a kind of toner, and to provide an information recording medium using the same. <P>SOLUTION: The core substrate sheet 40 for a card contains: a core substrate 10; and an adhesive layer 20 containing a urethane modified acryl resin disposed at least on one surface of the core substrate 10. The information recording medium has image information 30 formed by the toner placed on the surface of an adhesive layer 20 of the core substrate sheet 40 for a card. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a card core base sheet and an information recording medium.

  In recent years, along with the development of image forming technology, means for forming images of the same quality in large quantities and at low cost by various printing methods such as intaglio printing, relief printing, planographic printing, gravure printing, and screen printing are known. Yes. Such a printing method is used to manufacture an information recording medium that can store predetermined information such as an IC card, a magnetic card, an optical card, or a combination of these, and can communicate with or without contact with an external device. Are often used.

  The most main image forming means for the information recording medium at present is an image forming method using a printer or the like that employs a sublimation type or melting type thermal transfer method using an ink ribbon or the like.

  On the other hand, image formation by electrophotography is also known. In this image formation (printing) by electrophotography, the surface of the image carrier is charged and exposed in accordance with an image signal. An electrostatic latent image is formed by a potential difference, and then a color powder (image forming material) called toner having a polarity opposite (or the same) as that of the charging is electrostatically developed, whereby a visible image is formed on the surface of the image carrier. This is performed by a method of forming (toner image). In the case of a color image, this process is repeated a plurality of times, or a plurality of image forming devices are arranged in parallel to form a visible color image, and these are transferred and fixed (fixed: mainly by heat) to the image recording medium. This is performed by a method of obtaining a color image by melting and solidifying the color powder by cooling.

  As described above, in the electrophotographic method, the electrostatic latent image on the surface of the image carrier is electrically formed by the image signal, so that not only the same image can be formed many times, but also different images can be easily handled. Image formation is possible. In addition, the toner image on the surface of the image carrier can be transferred almost completely to the surface of the image recording body, and the toner image slightly remaining on the surface of the image carrier can be easily removed with a resin blade or a brush. Therefore, it is possible to easily produce printed materials for multi-product small-volume production.

  The toner is usually formed by melting and mixing a heat-meltable resin (binder resin), a pigment, and optionally additives such as a charge control agent, and pulverizing and granulating the kneaded product. Furthermore, the electrostatic latent image in the electrophotographic method has a considerably higher resolution than the above-mentioned particle toner, and a sufficient resolution is expected even when compared with the resolution of the screen printing or thermal transfer method of the ink ribbon. it can.

  For color images, the four primary colors of cyan, magenta, yellow, and black are used as color toners, and these can be mixed to theoretically reproduce the same color as in printing. In the above color toner, since the toner resin and the pigment can be blended relatively freely, it is easy to increase the image concealment by the toner.

  Although the heat resistance and light resistance of information recording media intended for outdoor use have hardly been studied so far, especially when a driver's license is placed in direct sunlight in a vehicle, As a result, a thermal transfer type image using a dye is faded. However, in color images formed by electrophotography, pigments with excellent light resistance corresponding to each color of cyan, magenta, yellow, and black are used in the color toner. It is considered that the light resistance of the obtained image is sufficiently excellent. Similarly, if a heat-resistant toner is selected, it is considered that the heat resistance of an image formed on the information recording medium can be used outdoors.

  On the other hand, the base material (core) of various cards currently used most frequently is a vinyl chloride sheet. This is because the cost is low, the printing characteristics are excellent in a conventional printing press, and the embossing suitability (unevenness processing of characters and the like) is also excellent.

  When it is assumed that the embossing is not performed when the card is manufactured, a conventional biaxially stretched PET (polyethylene terephthalate) film or the like can be used. However, embossing is often indispensable in order to continue the functions of conventional cards, and at present, ABS resin films and polyolefin resin films that soften at a relatively low temperature, and at least ethylene glycol, terephthalic acid, and 1,4 -A modified PET resin film called PETG obtained by copolymerization of cyclohexanedimethanol, an integrally formed film of a modified PET resin film and a PET film, an amorphous PET resin film, or a polycarbonate resin film has come to be used.

Examples of printing various cards using the electrophotographic apparatus described above include the following.
For example, in addition to various personal information, an invisible barcode is printed on a 250 μm-thick vinyl chloride sheet or a 280 μm-thick polyester sheet by electrophotography, overlaid on the printed surface, and laminated with a hot press. There is a method (for example, refer to Patent Document 1).

Further, there is a method in which personal identification information is printed on a light-transmitting sheet and the above printing is performed as a mirror image (for example, see Patent Document 2).
On the other hand, it has been reported that a urethane-polyester resin is used for a card sheet (see, for example, Patent Document 3).
In addition, there is a method of printing an electrophotographic image as a mirror image and transferring the image to a card sheet (for example, see Patent Document 4).

JP 2001-92255 A JP-A-11-334265 JP 2001-205945 A JP 2005-227377 A

  SUMMARY OF THE INVENTION An object of the present invention is to provide a core substrate sheet for cards that exhibits excellent toner fixing properties regardless of the type of toner, and an information recording medium using the same.

  That is, the invention according to claim 1 is a core substrate sheet for a card having a core substrate and an adhesive layer containing at least a urethane-modified acrylic resin provided on at least one surface of the core substrate.

  The invention according to claim 2 is the core substrate sheet for card according to claim 1, wherein the urethane-modified acrylic resin is a graft polymer of an acrylic resin and a polyester-based urethane resin.

  The invention according to claim 3 is the core substrate sheet for card according to claim 1 or 2, wherein the adhesive layer further contains a wax.

  The invention according to claim 4 is formed by a core base material, an adhesive layer containing at least a urethane-modified acrylic resin provided on at least one surface of the core base material, and a toner provided on the surface of the adhesive layer. An information recording medium having image information.

  The invention according to claim 5 is the information recording medium according to claim 4, wherein the binder resin constituting the toner is a styrene resin, an acrylic resin, or a styrene-acryl copolymer resin.

  According to the first aspect of the present invention, there is obtained a core substrate sheet for a card that exhibits excellent toner fixability without depending on the type of the binder resin of the toner as compared with the case where the adhesive layer does not contain a urethane-modified acrylic resin. It is done.

  According to the second aspect of the present invention, the toner fixability is further improved as compared with the case where the urethane-modified acrylic resin is not a graft polymer of an acrylic resin and a polyester urethane resin.

  According to the invention which concerns on Claim 3, the tack | tuck on the surface of an adhesive layer is suppressed compared with the case where an adhesive layer does not contain a wax.

  According to the fourth aspect of the present invention, an information recording medium excellent in fixability of image information can be obtained as compared with the case where this configuration is not provided.

  According to the fifth aspect of the present invention, an information recording medium excellent in image information fixability can be obtained as compared with the case where this configuration is not provided.

It is sectional drawing which shows the information recording medium which concerns on 1st embodiment. It is sectional drawing which shows the information recording medium which concerns on 2nd embodiment. It is sectional drawing which shows the information recording medium which concerns on 3rd embodiment.

  Hereinafter, embodiments of the card core base sheet and the information recording medium of the present invention will be described in detail.

<Core substrate sheet for card>
The card core substrate sheet according to the present embodiment includes a core substrate and an adhesive layer containing at least a urethane-modified acrylic resin provided on at least one surface of the core substrate.

There are roughly two types of toners: polyester resin toners and styrene / acrylic resin toners. When an image formed with toner (toner image) is transferred to a card core base sheet, if the combination of the card core base sheet and the toner is poor, the transferred toner image is the card core base sheet. There is a drawback that it is easily peeled off.
However, since the core substrate sheet for cards according to the present embodiment has an adhesive layer containing at least a urethane-modified acrylic resin on at least one surface of the core substrate, a polyester resin toner, a styrene / acrylic resin toner, etc. Regardless of the type, it exhibits excellent toner fixing properties for the card core substrate sheet. Therefore, the toner image is prevented from falling off from the card core base sheet.

  Therefore, by using the card core base sheet for the card according to the present embodiment, an image transfer sheet in which the toner image is formed as a mirror image by the electrophotographic apparatus, the toner image surface side is laminated to the card core base sheet, Further, when the image transfer sheet is peeled off and the toner image is transferred to the card core substrate sheet, the toner image is firmly adhered.

In this embodiment, the urethane-modified acrylic resin refers to a resin in which a urethane resin component and an acrylic resin component are chemically bonded. In the present embodiment, as a method of modifying the acrylic resin with the urethane resin component, it is more effective to chemically bond the urethane resin and the acrylic resin component from the viewpoint of compatibility, liquid stability, coatability, and the like. is there.
Specifically, for example, the reaction of a polymer in which a hydroxyl group is introduced into an acrylic polymer with 2-hydroxypropyl (meth) acrylate, 2-hydroxyethyl (meth) acrylate, or the like and a urethane prepolymer having an isocyanate group at the molecular end. Or synthesized by reaction of an acrylic component (R ₂ —OH) having a hydroxyl group at the molecular end (one end or both ends) and a urethane prepolymer (R ₁ —NCO) having an isocyanate group at the end, as shown below. The As the urethane prepolymer, polyether, polyester, polyolefin and the like are used.
In the polymer thus obtained, the urethane chain and the acrylic chain may be bonded together in a block type or in a graft type.
In the present embodiment, the urethane-modified acrylic resin is preferably a graft polymer of an acrylic resin and a polyester urethane resin.

  The production method of the urethane-modified acrylic resin used in the present embodiment is not limited to the above-mentioned method, but also a method of adding diisocyanate to an acrylic diol mixed system, a both-end or single-end isocyanate polyester to an acrylic monomer, It can also be obtained by adding a polyether or the like and polymerizing or copolymerizing the urethane acrylate. Moreover, as an acrylic resin component used for these synthesis | combination, the thing whose glass transition temperature (Tg) as a polymer is room temperature (22 degreeC) to 120 degreeC is preferable, More preferably, the thing of 60 degreeC or more and 110 degrees C or less is preferable. preferable. In addition to the above 2-hydroxyethyl (meth) acrylate, for example, methyl (meth) acrylate, ethyl (meth) acrylate, isobutyl (meth) acrylate, n-butyl (meth) acrylate, glycidyl (meth) acrylate, etc. ) Acrylic esters, acrylonitrile, acrylamide, etc. are also used. Furthermore, these may be copolymerized with polymerizable monomers such as styrene, vinyl acetate, vinyl chloride, maleic acid and derivatives thereof.

In this case, the composition of the acrylic resin component in the urethane-modified acrylic resin is preferably 5% by mass or more and 95% by weight or less, and particularly preferably 50% by mass or more and 90% by weight or less.
In the urethane-modified acrylic resin, since the urethane component and the acrylic component are chemically bonded, various physical properties such as surface hardness, thermosoftening property, and adhesiveness can be adjusted by changing their composition ratio. This is the reason why the urethane-modified acrylic resin is preferable compared to other resins.

The content of the urethane-modified acrylic resin contained in the adhesive layer is not particularly limited, but is preferably in the range of 20% by weight to 100% by weight, and in the range of 50% by weight to 95% by weight. Is more preferable.
When the content of the urethane-modified acrylic resin contained in the adhesive layer is less than 20% by weight, it may be difficult to adhere the toner image easily and firmly.

  It is preferable that particles are present on the surface of the card core substrate sheet according to the present embodiment. Such particles are preferably contained in at least a coating layer provided on the surface of the core substrate, particularly an adhesive layer containing a urethane-modified acrylic resin that is necessarily provided on the surface of the core substrate.

  The particles are preferably fixed to the surface of the card core substrate sheet so that part of the particles are exposed to the outside of the card core substrate sheet surface and do not easily fall off. As a result, the coefficient of friction on the surface of the card core substrate sheet can be lowered, so that an image holding film on which a toner image is formed when an image holding film such as an image transfer sheet is laminated on the card core substrate sheet And the core substrate sheet for cards are improved in transportability in a registration apparatus.

  The size of the particles used for such purposes is not particularly limited, but when added to a coating layer such as an adhesive layer, the average particle size is preferably in the range of 5 μm to 35 μm, preferably 10 μm or more. More preferably, it is within the range of 30 μm or less. The average particle diameter of the particles can be selected according to the thickness of the coating layer to which the particles are added so that the particles are easily fixed in a form in which a part of the particles are exposed on the surface of the card core substrate sheet. If the average particle size of the particles is less than 5 μm, the layer thickness required for the adhesive layer cannot be obtained, the toner image cannot be embedded sufficiently, and the image is crushed more than necessary, resulting in boldness (deterioration) and image reproducibility. May get worse. On the other hand, if the average particle diameter of the particles exceeds 35 μm, the amount of the adhesive may exceed the required amount (excess), or the particles themselves may deteriorate the image.

  Although it does not specifically limit as particle | grains used for this embodiment, In the case of what is comprised from an organic resin particle, specifically, styrenes, such as styrene, vinyl styrene, chlorostyrene; ethylene, propylene, butylene, isobutylene, etc. Mono-olefins; vinyl esters such as vinyl acetate, vinyl propionate, vinyl benzoate, vinyl butyrate; methyl acrylate, ethyl acrylate, butyl acrylate, dodecyl acrylate, octyl acrylate, phenyl acrylate, methacrylic acid Esters of α-unsaturated fatty acid monocarboxylic acids such as methyl, ethyl methacrylate, butyl methacrylate, dodecyl methacrylate; vinyl ethers such as vinyl methyl ether, vinyl ethyl ether, vinyl butyl ether; vinyl methyl ketone, vinyl hex Ketone, vinyl ketones such as vinyl isopropenyl ketone; isoprene, 2-chlorobutadiene and the like by polymerizing one or more diene monomers can be exemplified homopolymers or copolymers obtained.

  Among these, homopolymers or copolymers such as styrenes and esters of α-unsaturated fatty acid monocarboxylic acids are preferred. When thermoplastic resins are used as particles, they can be used as particles constituting the adhesive layer by coating with a solvent that does not dissolve these resins. Preferably, a crosslinking agent or the like is added to these thermoplastic resins. Thus, particles obtained by granulating a thermosetting resin, a photocurable resin, an electron beam curable resin or the like having a crosslinked structure are more preferably used.

  When the particles are composed of inorganic particles, specific examples include mica, talc, silica, calcium carbonate, zinc white, halocyto clay, kaolin, hydrochloric magnesium carbonate, quartz powder, titanium dioxide, sulfuric acid. Examples include barium, calcium sulfate, and alumina.

As the shape of the particle, a spherical particle is generally used, but it may be a plate shape, a needle shape, or an indefinite shape.
As described above, in order to improve the transportability of the card core base sheet, it is preferable to reduce the friction on the surface of the card core base sheet with particles. The surface static friction coefficient is preferably 2 or less, more preferably 1 or less. The dynamic friction coefficient of the image holding film surface is preferably in the range of 0.2 to 1, more preferably in the range of 0.3 to 0.65.

  The mass ratio of the particles to the urethane-modified acrylic resin (particles: urethane-modified acrylic resin) in the adhesive layer is preferably in the range of 0.01: 1 to 3: 1, and 0.05: 1 to 2: 1. More preferably, it is the range. When the ratio of the particles is within the above range, the image quality after lamination / transfer is stable and a high quality image can be obtained. However, when the ratio is less than the above range, tackiness is manifested in a high temperature and high humidity environment. If the core substrate sheets for cards are stacked, the core substrate sheets for cards may be bonded. When the amount is larger than the above range, the adhesive strength after lamination / transfer may not be sufficiently exhibited.

The adhesive layer according to this embodiment may contain a wax as necessary. Examples of the wax include paraffin wax such as low molecular weight polypropylene and low molecular weight polyethylene; silicone resin; rosins; rice wax; carnauba wax; The melting point of these waxes is preferably 60 ° C. or higher and 110 ° C. or lower, and more preferably 75 ° C. or higher and 95 ° C. or lower. Among these, carnauba wax and paraffin wax are particularly preferable as the wax.
The content of the wax in the adhesive layer is preferably 3% by mass or more and 20% by mass or less, and more preferably 5% by mass or more and 15% by mass or less. If the content of the wax is within the above range, the occurrence of tack is suppressed.

The core substrate according to the present embodiment may be transparent or colored, but when colored, white is preferable. When a transparent core substrate is used, the image-holding film is white, and an information recording medium can be obtained by laminating the image-holding film with the image-holding surface of the image-holding film on the outside and laminating with the card core-base sheet.
When the core substrate is white, the image holding film can be white or transparent. In the case of a transparent image holding film, an information recording medium can be obtained by laminating the image holding surface on the outer side or the inner side with a card core substrate sheet. An information recording medium can also be obtained by transferring an image to a card core substrate sheet. In addition, when laminating inside and transferring an image, it is necessary to print the image on a mirror image.

  As a method for whitening the core substrate, a method of mixing a white pigment, for example, metal oxide particles such as silicon oxide, titanium oxide, and calcium oxide, an organic white pigment, and polymer particles into the core substrate is used. it can

  Examples of the resin used for the core substrate include polystyrene resins, vinyl chloride resins, ABS resins, AS (acrylonitrile-styrene) resins, polyethylene terephthalate (PET), polyolefin resins such as polyethylene and polypropylene, and the like. . Conventionally, polyvinyl chloride, which has been used as a core base material for cards, has not been used because it has been recognized that it is not environmentally friendly as it generates dioxins by burning when combustibles are discarded. Therefore, in the present embodiment, considering the use of the above-mentioned base material containing no chlorine, the core base material, particularly, about half of the ethylene glycol component of PET (polyethylene terephthalate) using ethylene glycol and terephthalic acid is used. It is preferable to use a polyester resin (hereinafter sometimes abbreviated as PETG resin) copolymerized by replacing with a 1,4-cyclohexane methanol component. In addition, an alloy obtained by mixing polycarbonate resin or polyarylate resin with PETG and the like can be preferably used.

  Polyester resin obtained by copolymerizing at least ethylene glycol, terephthalic acid, and 1,4-cyclohexanedimethanol component is a urethane-modified polyester resin contained in a coating solution used when an adhesive layer is formed on the core substrate surface. Therefore, the surface of the core base material containing the PETG resin and the adhesive layer provided in contact with the surface of the core base material are firmly bonded to each other, and peeling can be prevented. Moreover, even if it peels, it cannot peel cleanly in an interface part. For this reason, when an image holding film is laminated on a core substrate to form a card (information recording medium), forgery can be reliably prevented.

  In addition, PETG resin is not only excellent in compatibility with the components in the coating solution, but is also suitable for the production of cards and the like using existing equipment among resins that can be used as a core substrate. In addition, information recording media manufactured using image-holding films, such as sunlight and fluorescent lamps, are exposed under normal usage conditions, compared to the vinyl chloride resin that has been used as a material for the core substrate. Resistant to yellowing and excellent light resistance.

The core substrate used in the present embodiment may be composed of two or more layers from the viewpoint of lamination and image transferability.
In this case, for example, it is preferable that the urethane-modified polyester resin is contained in at least one of the surfaces forming the outer surface of the core substrate, and the other surface may be a layer made of only PETG resin. Further, since the PETG resin has a softening point temperature of around 80 ° C., it can be easily heat-sealed. For this reason, even a layer of only PETG resin is excellent in laminating properties, but in that case, it is preferable that there is no image or a specification that takes measures for preventing forgery that cannot be recognized by humans.

  As the core substrate used in the present embodiment, it is preferable to use a film made of a plastic having a thickness of 50 μm or more and 5000 μm or less. PETG resin, vinyl chloride, biaxially stretched PET having a thickness of 100 μm or more and 1000 μm or less It is more preferable to use a sheet.

In the present embodiment, when the final information recording medium is used as an IC card or the like, the core base material has a semiconductor circuit inside or on the surface (laminate surface when used as an information recording medium). Can be used.
As a method of incorporating a semiconductor circuit in a core base material, a method called an inlet in which the semiconductor circuit is fixed is sandwiched between sheet materials constituting the core base material, and heat fusion is integrated by hot press. Generally, it is preferably used. Further, it is possible to arrange a semiconductor circuit directly without the inlet sheet and to integrate the same by heat fusion.

In addition, it is possible to bond sheets constituting the core base material using an adhesive such as hot melt, and to incorporate a semiconductor circuit in the same manner, regardless of the above heat fusion. For example, any method for incorporating a semiconductor circuit in an IC card may be applied as a method for manufacturing a core substrate.
Furthermore, if there is no problem in use as an information recording medium, it is possible to arrange the semiconductor circuit in a state where it is exposed not on the inside of the core substrate but on the surface (the outer surface when used as an information recording medium).

  When the information recording medium of this embodiment is used not only as an IC card but also as a magnetic card, an antenna, a magnetic stripe, an external terminal, etc. are embedded in the core sheet as necessary. Moreover, a magnetic stripe, a hologram, etc. may be printed and required character information may be embossed.

The adhesive layer containing at least the urethane-modified acrylic resin is formed on the surface of the core substrate by the following method.
The adhesive layer is prepared by mixing a resin (and particles, wax, etc., if necessary) using an organic solvent or water, and uniformly dispersing the mixture with an apparatus such as an ultrasonic wave, a wave blower, an attritor or a sand mill. It is formed by preparing a working liquid and applying or impregnating the coating liquid as it is to the surface of the core substrate.

  As a method of applying or impregnating, blade coating method, wire bar coating method, spray coating method, dip coating method, bead coating method, air knife coating method, curtain coating method, roll coating method, screen printing method, etc. are usually used. Method is adopted.

  However, in the preparation of the coating liquid, it is preferable to use a good solvent that dissolves the surface of the core substrate as the solvent. When such a good solvent is used, the core substrate surface dissolves, the core substrate surface acts as a binder resin, and the bond with the adhesive layer becomes strong, and it is easy to stably hold particles and image forming materials. Become.

However, a good solvent for the surface of the core substrate means that when the solvent contacts the surface of the core substrate, it has some effect on the core substrate, and the surface of the core substrate is slightly affected (solvent removal). After that, it means that the surface has a slightly higher solubility.
From this point of view, the surface of the core base material on which the adhesive layer is formed contains PETG resin or vinyl chloride resin excellent in compatibility with a general solvent used in the coating liquid. It is preferable that the resin is covered with these resins.

  The solvent for extracting compatibility between the PETG resin or vinyl chloride resin contained in the core substrate surface and the resin contained in the coating layer is not particularly limited as long as it is a solvent used for preparing a known coating solution. Specific examples include aromatic hydrocarbons such as toluene and xylene, halogenated hydrocarbons such as methylene chloride and chlorobenzene, ketones such as methyl ethyl ketone and cyclohexanone, tetrahydrofuran, ethyl acetate, mixtures of these solvents, and other poor hydrocarbons. A mixed solvent with a solvent may be used.

  The drying at the time of forming the adhesive layer on the surface of the core substrate may be air drying, but is easily dried by heat drying. As the drying method, a commonly used method such as a method of placing in an oven, a method of passing through an oven, or a method of contacting with a heating roller is employed.

<Information recording medium>
The information recording medium according to the present embodiment is formed by a core base material, an adhesive layer containing at least a urethane-modified acrylic resin provided on at least one surface of the core base material, and a toner provided on the surface of the adhesive layer. Image information.
In the information recording medium according to the present embodiment, the image information formed by the toner is provided on the surface of the adhesive layer containing at least the urethane-modified acrylic resin, and thus the image information is excellent in fixability.

  The information recording medium according to the present embodiment includes an image holding film provided with a toner image (fixed or unfixed) on its surface (at least a laminate surface), and a core substrate that may be transparent or white. It is produced through at least a laminating step in which the core base sheet for card having a material is laminated and joined.

The case where an image is formed on an image holding film by an electrophotographic method will be described below. Image formation on an unprinted image holding film by an electrophotographic method is performed by uniformly charging the surface of an electrophotographic photosensitive member (image holding member). Then, the surface is exposed according to the obtained image information, and an electrostatic latent image corresponding to the exposure is formed. Next, the electrostatic latent image is visualized and developed with the toner (toner image is formed) by supplying toner as an image forming material from the developing device to the electrostatic latent image on the surface of the electrophotographic photoreceptor. . Further, the formed toner image is transferred to the surface of the image-receiving layer of the unprinted image-holding film, and finally the toner image is fixed on the surface of the image-receiving layer by heat, pressure, etc. An image is formed.

The image holding film may be composed of, for example, a substrate and an image receiving layer provided on the substrate.
The image receiving layer provided on the surface of the image holding film may contain, for example, a resin and particles, and in addition thereto, various additives such as a charge control agent may be added as necessary. Hereinafter, the resin and particles constituting the image receiving layer will be described.

In the present invention, a polyester resin may be used as the resin constituting the image receiving layer, or a combination of a polyester resin and another resin may be used.
The polyester resin used for the image receiving layer is preferably a saturated polyester resin obtained by condensation reaction of a polybasic acid component having two or more carboxyl groups and a glycol component.

Further, as the resin constituting the image receiving layer, a silicone hard coat material or the like may be used as a releasable material.
In addition, the said silicone type hard-coat material used for this embodiment consists of a condensate resin which contains a silane type composition at least, or a mixed composition of these and a colloidal silica dispersion liquid. Moreover, in order to improve adhesiveness with a base | substrate, it is preferable that the organic resin is further included.

  The silane composition is specifically an organosilicon compound, and includes a silane compound, a fluorine-containing silane compound, an isocyanate silane compound, and the like, and these undergo a condensation reaction to form a resin composition.

Silane compounds include Si (OCH ₃ ) ₄ , CH ₃ Si (OCH ₃ ) ₃ , HSi (OCH ₃ ) ₃ , (CH ₃ ) ₂ Si (OCH ₃ ) ₂ , CH ₃ SiH (OCH ₃ ) ₂ , C ₆ H ₅ Si (OCH ₃ ) ₃ , Si (OC ₂ H ₅ ) ₄ , CH ₃ Si (OC ₂ H ₅ ) ₃ , (CH ₃ ) ₂ Si (OC ₂ H ₅ ) ₂ , H ₂ Si (OC _{2 H 5) 2, C 6 H} 5 Si (OC 2 H 5) 3, (CH 3) 2 CHCH 2 Si (OCH 3) 3, CH 3 (CH 2) 11 Si (OC 2 H 5) 3, CH 3 Alkoxysilanes such as (CH ₂ ) ₁₅ Si (OC ₂ H ₅ ) ₃ and CH ₃ (CH ₂ ) ₁₇ Si (OC ₂ H ₅ ) ₃ ; silazanes such as (CH ₃ ) ₃ SiNHSi (CH ₃ ) _{3 ; ((CH 3) SiNH)} 2 CO, tert-C 4 H 9 (CH 3) 2 special silylating agent such as SiCl; silane coupling agent And _{HSC 3 H 6 Si (OCH 3} ) silane compounds such as _3; and hydrolysates thereof and partial condensates, and the like.

  Examples of the silane coupling agent include vinyl silanes such as vinyltris (β-methoxyethoxy) silane, vinyltriethoxysilane, and vinyltrimethoxysilane; acrylic silanes such as γ-methacryloxypropyltrimethoxysilane; β- (3, Epoxy silanes such as 4-epoxycyclohexyl) ethyltrimethoxysilane, γ-glycidoxypropylmethyldiethoxysilane; N-β- (aminoethyl) -γ-aminopropylmethyldimethoxysilane, γ-aminopropyltriethoxysilane And aminosilanes such as N-phenyl-γ-aminopropyltrimethoxysilane;

Examples of the fluorine-containing silane compounds include CF ₃ (CH ₂ ) ₂ Si (OCH ₃ ) ₃ , C ₆ F ₁₃ C ₂ H ₄ Si (OCH ₃ ) ₃ , and C ₇ F ₁₅ CONH (CH ₂ ) _3. Si (OC ₂ H ₅ ) ₃ , C ₈ F ₁₇ C ₂ H ₄ Si (OCH ₃ ) ₃ , C ₈ F ₁₇ C ₂ H ₄ SiCH ₃ (OCH ₃ ) ₂ , C ₈ F ₁₇ C ₂ H ₄ Si ( ON = C (CH ₃ ) (C ₂ H ₅ )) ₃ , C ₉ F ₁₉ C ₂ H ₄ Si (OCH ₃ ) ₃ , C ₉ F ₁₉ C ₂ H ₄ Si (NCO) ₃ , (NCO) ₃ SiC ₂ H ₄ C ₆ F ₁₂ C ₂ H ₄ Si (NCO) ₃ , C ₉ F ₁₉ C ₂ H ₄ Si (C ₂ H ₅ ) (OCH ₃ ) ₂ , (CH ₃ O) ₃ SiC ₂ H ₄ C ₈ Fluorine-containing silane compounds such as F ₁₆ C ₂ H ₄ Si (OCH ₃ ) ₃ , (CH ₃ O) ₂ (CH ₃ ) SiC ₉ F ₁₈ C ₂ H ₄ Si (CH ₃ ) (OCH ₃ ) _{2, and the} like Water Silane compounds such as decomposition products or partial condensates thereof are exemplified.

Examples of the isocyanate silane compounds include (CH ₃ ) ₃ SiNCO, (CH ₃ ) ₂ Si (NCO) ₂ , CH ₃ Si (NCO) ₃ , vinylsilyl triisocyanate, C ₆ H ₅ Si (NCO) ₃ , Si (NCO) ₄ , C ₂ H ₅ OSi (NCO) ₃ , C ₈ H ₁₇ Si (NCO) ₃ , C ₁₈ H ₃₇ Si (NCO) ₃ , (NCO) ₃ SiC ₂ H ₄ (NCO) ₃ etc. Is done.

  Examples of the condensate resin of the silane-based composition in the present invention include curable silicone resins such as thermosetting (condensation type, addition type) and photo-curable curable silicone resins. Specific examples are given below. And the following.

Among the thermosetting silicone resins, the condensation-type curable silicone resin is based on a polysiloxane such as polydimethylsiloxane having a silanol group at the end and a polymethylhydrogensiloxane as a crosslinking agent. Curable silicone resins synthesized by heat condensation in the presence of organic acid metal salts such as organotin catalysts and amines, and polydiorganosiloxanes having reactive functional groups such as hydroxyl groups and alkoxy groups at the ends. A curable silicone resin synthesized by reaction, a polysiloxane resin synthesized by condensing silanol obtained by hydrolyzing a trifunctional or higher functional chlorosilane or a mixture of these with a monofunctional or bifunctional chlorosilane, etc. Can be mentioned.
The condensation type is classified into a solution type and an emulsion type in terms of form, and any of them is preferably used.

Among the thermosetting silicone resins, as an addition-type curable silicone resin, a polysiloxane such as polydimethylsiloxane containing a vinyl group is used as a base polymer, and polydimethylhydrogensiloxane is blended as a crosslinking agent. Examples thereof include a curable silicone resin synthesized by reaction and curing in the presence of a platinum catalyst.
The addition type is classified into a solvent type, an emulsion type, and a solventless type in terms of form, and any of them is preferably used.

  Examples of the thermosetting silicone resin obtained by the condensation type and addition type curing include, for example, pure silicone resin, silicone alkyd resin, silicone epoxy resin, silicone polyester resin, silicone acrylic resin, silicone phenol resin, silicone urethane resin, and silicone. A melamine resin etc. are mentioned suitably.

  Examples of the photocurable silicone resin include a curable silicone resin synthesized using a photocationic catalyst, and a curable silicone resin synthesized using a radical curing mechanism. Moreover, the modification | denaturation obtained by carrying out photocuring reaction of the low molecular weight polysiloxane which has a hydroxyl group or an alkoxy group etc. couple | bonded with the silicon atom, and an alkyd resin, a polyester resin, an epoxy resin, an acrylic resin, a phenol resin, a polyurethane, or a melamine resin. Silicone resin is preferably used. These may be used individually by 1 type and may use 2 or more types together.

  The image receiving layer may contain particles having a volume average particle diameter of 5 μm or more and 20 μm or less, and the volume average particle diameter of the particles is preferably 10 μm or more and 15 μm or less. The particles are preferably contained at least near the surface of the image receiving layer.

  Here, the thickness of the image receiving layer preferably does not exceed at least the volume average particle diameter of the particles in order to ensure adhesion, transportability and anti-tacking properties for particle retention, and in the range of 1 μm to 10 μm. More preferably.

  The substrate used for the image holding film is not particularly limited, but a plastic film may be representatively used. Among these, PET films that can be used as OHP films or printing films, such as polyacetate film, cellulose triacetate film, nylon film, polyester film, polycarbonate film, polysulfone film, polystyrene film, polyphenylene sulfide film, polyphenylene ether film , Cycloolefin film, polypropylene film, polyimide film, cellophane, ABS (acrylonitrile-butadiene-styrene) resin film, polyarylate film and the like are preferably used.

  By using a polyester resin or a silicone-based hard coat material for the image-receiving layer provided on the surface of the image-holding film, the adhesion to the toner is improved, and the toner on the surface of the image-holding film is below the temperature where the toner melts and becomes viscous. Becomes established.

  Therefore, it is preferable to fix the toner image formed on the surface of the image holding film so that the temperature of the surface of the image holding film (image forming surface) is equal to or lower than the melting temperature of the toner. Considering the melting temperature of normal toner, it is preferable that the image holding film has a surface temperature of 125 ° C. or lower, more preferably 110 ° C. or lower.

  In this image holding film, when the image forming surface (the surface on which the image receiving layer is provided) is a laminate surface, the image formed on the image receiving layer of the unprinted image holding film is a reverse image (mirror image). There is a need to. When an electrostatic latent image is formed on the surface of the photoconductor, it is preferable that mirror image information is provided as image information exposed on the surface of the photoconductor.

In the laminating step, any of various conventionally known laminating techniques and laminating apparatuses are preferably employed. However, in the production of the information recording medium of this embodiment, the laminated body in which the image holding film and the card core base sheet are overlapped is inserted into the press-contact part (nip part) of a pair of heatable heat rolls. Thus, a heat press method (hereinafter, may be abbreviated as “roll press”) in which both are thermally melted and thermally fused may be used.
However, in particular, in the method of manufacturing the information recording medium of the present embodiment, after the laminate in which the image holding film and the card core base sheet are stacked is disposed between a pair of pressing plate members, the lamination is performed. It is preferable to use a heat press method (hereinafter sometimes abbreviated as “plate material press”) in which the body is pressed while being heated through the pair of pressing plate materials.
After heat pressing, if necessary, the toner image is transferred onto the core base material by peeling off the base material of the image holding film from the core base material, whereby an information recording medium can be produced.

  The information recording medium according to the present embodiment includes (1) an image holding film having a toner image according to information formed on a laminate surface, and a transparent or white core base material that is overlapped and bonded to the image holding film. A card having a structure including at least a core substrate sheet for card, and (2) an image holding film having a toner image formed on a laminate surface, and a transparent or white core substrate which is overlapped and bonded to the image holding film. Arranged in at least one of the core substrate sheet for use, the inside of the core substrate, the surface opposite to the laminate surface of the core substrate, and the bonding surface between the image holding film and the core substrate sheet for cards At least information can be read out by using at least one means selected from electrical means, magnetic means, and optical means. And information chips include at least comprises configure.

  In addition, it is preferable that at least the urethane-modified acrylic resin described above is included in at least the surface on the laminate side of the image holding film used for producing the information recording medium of the present invention. In this case, when the core substrate sheet for card and the image holding film are laminated / transferred, the both are more firmly bonded.

  In the information recording medium shown in (1) above, the toner image is partly or wholly also serves as information having some identification function, and includes a toner image that functions as identifiable information such as image information and character information. If it is, it will not specifically limit. Further, the identification of the toner image as information is not particularly limited as to whether the toner image is visually identified, and may be mechanically identified.

  In the information recording medium shown in (2) above, the information chip has information having some kind of identification function, and at least one means selected from the group consisting of electrical means, magnetic means, and optical means is provided. There is no particular limitation as long as it can be read by use. This information chip may be dedicated to reading information, but may be one that can both read and write information (including “rewriting”) as necessary. A specific example of such an information chip is an IC chip (semiconductor circuit).

  Note that the toner image formed when the above-described information chip is used as the information source of the information recording medium is not particularly limited as to whether or not a part or all of the toner image has information having some kind of identification function.

On the other hand, the information included in the toner image or the information chip is not particularly limited as long as it can be identified, but may include variable information. The variable information means that information held by individual information recording media is different among a plurality of information recording media manufactured according to the same standard or standard.
For example, when the toner image includes variable information, the toner image corresponding to the variable information may be a different toner image for each information recording medium.

  Further, the variable information may include personal information. In this case, the information recording medium of the present embodiment can be applied to cash cards, employee cards, student cards, personal membership cards, residence cards, various driver's licenses, various qualification certificates, etc. In this case, the personal information includes, for example, a face photograph, personal identification image information, name, address, date of birth, and combinations thereof.

  In the information recording medium of the present embodiment described above, the laminated surface of the image holding film provided with the toner image is overlapped with the core substrate sheet for card having a transparent or white core substrate, and bonded (laminated) in the laminating process. Then, after cooling, the image holding film may be peeled off from the card core substrate sheet as necessary, and the toner image may be transferred to the core substrate.

  The image holding film and the card core substrate sheet may be overlapped by holding and aligning the image holding film and the card core substrate sheet by hand, or the collation provided after image formation. The image holding film and the card core base sheet may be sequentially discharged and arranged on a tray or the like.

  When an image holding film (unfixed image holding film) on which an unfixed toner image has been formed without passing through the fixing step is used in the laminating step, the temperature at the time of laminating is used when the image holding film that has passed through the fixing step is used. By making it slightly higher than the above, the color developability of the toner is ensured.

  The laminated body can be used as it is as the information recording medium of the present invention. However, when a plurality of individual images are formed on the image holding film, the laminated body is cut for each image and has a predetermined size. A plurality of information recording media can be obtained.

Further, when the information recording medium of the present invention is used as an IC card using an information chip such as an IC chip, as described above when the information recording medium is finally produced, The information chip only needs to be arranged at least one of the surface of the core substrate opposite to the laminate surface and the bonding surface of the image holding film and the card core substrate sheet. However, in production, one having an information chip inside or on the surface of the core substrate is practically used.
As a method of incorporating an information chip in a core base material, a method called an inlet in which an information chip is fixed is sandwiched between sheet materials constituting the core base material, and heat fusion is integrated by heat press. Are preferably used. In addition, a method in which the information chip is directly arranged between the sheet materials constituting the core substrate without the inlet sheet and similarly heat-sealed and integrated is also possible.

In addition, the sheets constituting the core base material can be bonded together by using an adhesive such as hot melt, and the information chip can be incorporated in the same manner. For example, any method that incorporates an information chip in an information recording medium may be applied as a method for manufacturing a core substrate.
Furthermore, if there is no problem in use as an information recording medium, it is possible to arrange the information chip exposed on the surface rather than inside the core substrate.

  When the information recording medium of the present invention is used not only as an IC card but also as a magnetic card or the like, an antenna, a magnetic stripe, an external terminal or the like may be embedded in the core substrate as necessary. Moreover, a magnetic stripe, a hologram, etc. may be printed and required character information may be embossed.

Next, an embodiment of an information recording medium according to this embodiment will be described with reference to the drawings.
FIG. 1 is a cross-sectional view showing an information recording medium according to the first embodiment. In FIG. 1, an adhesive layer 20 is formed on one side of a core base material 10, and image information 30 formed of toner is provided on the surface of the adhesive layer 20. The core substrate 10 and the adhesive layer 20 constitute a card core substrate sheet 40.
In the production of the information recording medium according to the first embodiment, the image information 30 is formed on the image receiving layer side of the image holding film using a silicone-based hard coat material as the image receiving layer, and the adhesive layer 20, the image receiving layer, After laminating in such a manner that the substrate of the image holding film is peeled off, only the image information 30 is transferred to the surface of the adhesive layer 20 without transferring the image receiving layer to the surface of the adhesive layer 20.

FIG. 2 is a cross-sectional view showing an information recording medium according to the second embodiment. In FIG. 2, an adhesive layer 20 is formed on one side of the core base material 10, and image information 30 formed of toner is provided on the surface of the adhesive layer 20. Further, an image receiving layer 50 is provided on the surface of the adhesive layer 20 so as to cover the image information 30. The core substrate 10 and the adhesive layer 20 constitute a card core substrate sheet 40.
In the production of the information recording medium according to the second embodiment, a resin (for example, polyester resin) is used as an image receiving layer, image information 30 is formed on the image receiving layer side of the image holding film, and the adhesive layer 20 and the image receiving layer are formed. Then, the image receiving layer 50 is transferred onto the surface of the adhesive layer 20 together with the image information 30 by peeling the substrate of the image holding film.

FIG. 3 is a sectional view showing an information recording medium according to the third embodiment. In FIG. 3, the adhesive layer 20, the image receiving layer 50, and the substrate 60 are provided in this order on one side of the core substrate 10, and the image information 30 is provided at the interface between the adhesive layer 20 and the image receiving layer 50. ing. The core substrate 10 and the adhesive layer 20 constitute a card core substrate sheet 40. Further, the substrate 60 and the image receiving layer 50 constitute an image holding film 70.
In the information recording medium according to the third embodiment, for example, the image information 30 is formed on the image receiving layer 50 side of the image holding film used in the first embodiment or the second embodiment, and the adhesive layer 20 and the image receiving layer 50 are formed. It is formed by laminating so as to be in contact with each other. In the information recording medium according to the third embodiment, the substrate 60 may function as a protective film.

  The information recording medium according to the first embodiment to the third embodiment is a mode in which image information is formed only on one side of the card core base sheet, but as a mode in which image information is formed on both sides. Also good.

  Hereinafter, the present embodiment will be described more specifically with reference to examples, but the present embodiment is not limited to these. In the following examples and comparative examples, “parts” and “%” are based on mass.

Example 1
A core substrate sheet for card (core substrate 1) was produced as follows. Hereinafter, the manufacturing method is demonstrated for every process.

<Preparation of adhesive layer coating solution A-1>
Urethane modified acrylic resin (manufactured by Taisei Fine Chemical Co., Ltd .: 8UA-443, acrylic resin component Tg 105 ° C., urethane: polyester, urethane / acrylic ratio = 3/7, solid content concentration 39%, methyl ethyl ketone / isopropyl alcohol (mass ratio) = 96/4 solvent) 80 parts, wax dispersion (manufactured by Sanyo Chemical Industries, Ltd .: WKC-10, solid content concentration 10% methyl ethyl ketone solvent), and crosslinked methacrylate ester copolymer particles (Soken Chemical Co., Ltd.) as particles (Product: MX-2000, average particle size: 20 μm) 2 parts was added and sufficiently stirred and mixed to prepare an adhesive layer coating solution A-1.

<Preparation of core substrate sheet for card>
A B4 size white sheet made of vinyl chloride resin (Mitsubishi Resin Co., Ltd., Vinyl foil C-4636, thickness: 500 μm) is used as a core substrate, and the adhesive layer coating liquid A-1 is wired on one side of this. The coating was performed using a bar and dried at 60 ° C. for 1 hour. Further, the other side was subjected to the same treatment to form adhesive layers each having a thickness of 16 μm on the front and back surfaces, and cut into A4 size (210 mm × 297 mm) to produce a core substrate sheet 1 for cards.

<Preparation of electrophotographic image transfer sheet>
(Preparation of image-receiving layer coating solution 1)
10 parts of a silicone hard coating agent containing organic silane condensate, melamine resin, alkyd resin (GE Toshiba Silicone, SHC900, solid content 30% by mass), and polydimethylsiloxane particles (GE Toshiba Silicone, TP130 as filler) (Average particle size: 3 μm) 0.002 part of ELEGAN 264WAX (manufactured by NOF Corporation) as a charge control agent is added to 30 parts of methyl ethyl ketone and sufficiently stirred to prepare an image-receiving layer coating solution 1 did.

(Preparation of image transfer sheet 1 and image formation)
A PET film (Lumirror 100T60, manufactured by Toray Industries, Inc., thickness: 100 μm) was used as a substrate, and the image receiving layer coating solution 1 was applied to both sides of the substrate using a wire bar, and dried at 120 ° C. for 30 seconds to form a film. An image receiving layer having a thickness of 1 μm was formed. Thereafter, it was cut into A4 size (210 mm × 297 mm) to prepare an image transfer sheet 1. The surface resistance value of the image receiving layer was 5.2 × 10 ¹¹ Ω / □ on both sides.

<Image formation>
Next, a color including a solid image using a color printer DocuPrint C 3540 (image forming material (toner): styrene-acrylic copolymer resin) manufactured by Fuji Xerox Co., Ltd. is used on the surface of the image receiving layer of the image transfer sheet 1. The image transfer sheet 1-U was produced by forming 10 card-sized images per A4 size of the mirror image. Similarly, 10 mirror image characters having only character information were formed to produce an image transfer sheet 1-D. Similarly, an image transfer sheet 1′-U on which ten card-sized images are formed in the same manner as described above using a color multifunction device DocuColor 1257 (image forming material (toner): polyester resin) manufactured by Fuji Xerox Co., Ltd., An image transfer sheet 1′-D on which ten mirror image characters having only character information were formed was produced.

<Production of information recording medium>
The image forming surface of the image transfer sheet 1-U is aligned with one side of the card core base sheet 1 and the image forming surface of the image transfer sheet 1-D is aligned with the other side so that the four corners of each film are aligned. The layers were overlapped, and both sides thereof were overlapped by being sandwiched by a set of pressing plate members having a specular surface made of a SUS steel plate.
The laminate (pressing plate material / image transfer sheet 1-U / card core base sheet 1 / image transfer sheet 1-D / pressing plate material) subjected to the above positioning and superposition is 120 ° C., 5 kgf / cm ^2. After 30 seconds of heat pressing and cooling to room temperature, the pressing plate material is removed, and the image transfer sheets 1-U and 1-D are peeled off to remove the information recording medium 1 on which only the image is transferred. Obtained. Further, the same operation was performed using the image transfer sheet 1′-U and the image transfer sheet 1′-D to obtain an information recording medium 1 ′ on which only the image was transferred.

<Evaluation of core substrate sheet for card>
The 20 card core base sheets 1 obtained above are stacked and left in an environment of 40 ° C. and 90% RH for 24 hours, and the tack (adhesion) properties of the 20 card core base sheets 1 are examined. Evaluation for storage was performed as follows.
◯: There was no tack force at all, and all 20 sheets were separated without problems.
Δ: A slight tack force was felt, but all 20 sheets could be separated (separated) without requiring a large force.
X: Tacking force was obvious, and the sheet was separated (separated) with a large force, or even one of the 20 sheets could not be separated.

-Storageability evaluation-
<Performance evaluation of information recording media>
The image quality, image fixability (peel strength) and light resistance evaluation of the information recording media 1 and 1 ′ were evaluated according to the following criteria, respectively, and the performance as an information recording medium was confirmed.

-Image quality evaluation-
The image quality evaluation was performed by measuring the rate of change (enlargement) of characters after laminating by applying thermal pressure to the characters at the time of image output to the image transfer sheet, and evaluating the print reproducibility as follows.
A: A change rate of less than 3% was shown.
Δ: A change rate of 3% or more and less than 7%.
X: The rate of change was 7% or more.

-Image fixability (peel strength) evaluation-
Regarding image fixability, a 1 mm × 1 mm grid is formed with a cutter on the surface of the information recording media 1 and 1 ′ after image transfer based on JIS K5600-5-6 (1999) adhesion (cross-cut method). 25 cross-cuts in this area, and a commercially available 18 mm wide cellophane adhesive tape (manufactured by Nichiban Co., Ltd., cellophane tape) is applied to the area at a linear pressure of 700 g / cm and peeled at a speed of 10 mm / sec. Evaluation was based on the degree of peeling.
(Double-circle): It does not peel at all.
○: Part of the line containing the blade is peeled off.
(Triangle | delta): The image has peeled from the core base material in some squares.
X: The image is clearly peeled off from the core substrate.

-Light resistance evaluation-
The light resistance evaluation was carried out in a light resistance tester (Toyo Seiki Co., Ltd .: SUNTEST CPS +) with an Xe lamp at 760 W / m ² in an atmosphere of 63 ° C. on the side of the information recording medium on which the solid image was formed. For 100 hours. Measure the image density of the solid image before and after the irradiation, and the difference in image density is less than 0.1 ◎, the difference between 0.1 and less than 0.5 is ○, 0.5 to 1.0 The thing was made into (triangle | delta) and the thing exceeding 1.0 was made into x. The image density was measured using an X-Rite967 densitometer (manufactured by X-Rite).
The above evaluation results are summarized in Table 1.

(Example 2)
<Preparation of adhesive layer coating liquid A-2>
Urethane modified acrylic resin (manufactured by Taisei Fine Chemical Co., Ltd .: 8UA-472, acrylic resin component Tg 95 ° C., urethane: polyester, urethane / acryl ratio = 4/6, solid content concentration 40%, methyl ethyl ketone / isopropyl alcohol (mass ratio) = 96/4 solvent) was used as the adhesive layer coating solution A-2.

<Preparation of core substrate sheet for card>
In the same manner as in Example 1, the adhesive layer coating liquid A-2 was applied to a B4 size white sheet (Mitsubishi Resin Co., Ltd .: Diafix PG-WHI, total thickness: 560 μm) composed of a PETG resin layer. The adhesive layer having a thickness of 12 μm is formed on the front and back surfaces, and this is cut into an A4 size (210 mm × 297 mm) to produce a core substrate sheet 2 for cards. In the same manner as in Example 1, information recording media 2 and 2 ′ were obtained.

<Evaluation of card core substrate sheet and information recording medium>
Evaluation similar to Example 1 was performed with respect to the card core base sheet 2 and the information recording media 2 and 2 ′.
The evaluation results are summarized in Table 1.

Example 3
30 parts of the wax dispersion liquid (manufactured by Sanyo Chemical Industries, Ltd .: WKC-10, solid content concentration 10% methyl ethyl ketone solvent) used in Example 1 was added to 80 parts of the adhesive layer coating liquid A-2 of Example 2. The mixture was sufficiently stirred and mixed to prepare an adhesive layer coating solution A-3. Thereafter, a card core substrate sheet 3 was produced in the same manner as in Example 2, and information recording media 3 and 3 ′ were obtained in the same manner as in Example 1 by using this.

<Evaluation of card core substrate sheet and information recording medium>
Evaluation similar to Example 1 was performed with respect to the card core base sheet 3 and the information recording media 3 and 3 ′.
The evaluation results are summarized in Table 1.

Example 4
The urethane-modified acrylic resin of the adhesive layer coating liquid A-1 of Example 1 (Taisei Fine Chemical Co., Ltd .: 8UA-502, acrylic resin component Tg 95 ° C., urethane: polyester, urethane / acrylic ratio = 3/7, solid An adhesive layer coating solution A-4 was prepared in the same manner as in Example 1 except that the partial concentration was 40% and methyl ethyl ketone / isopropyl alcohol (mass ratio) = 96/4 solvent) was changed to 80 parts. 1 was used to prepare a card core substrate sheet 4 and using this, information recording media 4 and 4 ′ were obtained in the same manner as in Example 1.

<Evaluation of card core substrate sheet and information recording medium>
Evaluation similar to Example 1 was performed with respect to the card | curd core base material sheet 4 and the information recording media 4 and 4 '.
The evaluation results are summarized in Table 1.

(Example 5)
The urethane-modified acrylic resin of adhesive layer coating solution A-1 of Example 1 (Taisei Fine Chemical Co., Ltd .: 8UA-483, acrylic resin component Tg 110 ° C., urethane: polyester, urethane / acrylic ratio = 3/7, solid Adhesive layer coating solution A-5 was prepared in the same manner as in Example 1 except that the partial concentration was 40%, and methyl ethyl ketone / isopropyl alcohol (mass ratio) = 96/4 solvent) was changed to 80 parts. 1 was used to produce a card core substrate sheet 5, and information recording media 5 and 5 ′ were obtained using the same as in Example 1.

<Evaluation of card core substrate sheet and information recording medium>
Evaluation similar to Example 1 was performed with respect to the card | curd core base material sheet 5 and the information recording media 5 and 5 '.
The evaluation results are summarized in Table 1.

(Comparative Example 1)
The B4 size white sheet (Mitsubishi Resin Co., Ltd., Vinyl foil C-4636, thickness: 500 μm) made of vinyl chloride resin in Example 1 was used as an untreated core base sheet 6 without an adhesive layer, In the same manner as in Example 1, information recording media 6 and 6 ′ were obtained.

<Evaluation of card core substrate sheet and information recording medium>
As a result of performing the same evaluation as in Example 1 on the card core substrate sheet 6 and the information recording media 6 and 6 ′, the information recording medium 6 and the polyester resin in which the image forming material is a styrene-acrylic copolymer resin are obtained. Some information recording media 6 'had poor image adhesion and could easily be peeled off.
The evaluation results are summarized in Table 1.

(Comparative Example 2)
Instead of the urethane-modified acrylic resin of the adhesive layer coating liquid A-1 in Example 1, a styrene acrylic resin (manufactured by Taisei Fine Chemical Co., Ltd .: 7RZ-011, Tg 72 ° C., solid content concentration 45%, ethyl acetate / n-butanol ( (Mass ratio) = 70/30 Solvent) Adhesive layer coating solution A-6 was prepared in the same manner as in Example 1 except that the solvent was changed to 65 parts. A sheet 7 was prepared, and information recording media 7 and 7 ′ were obtained using the sheet 7 in the same manner as in Example 1.

<Evaluation of card core substrate sheet and information recording medium>
As a result of evaluation similar to Example 1 performed on the card core base sheet 7 and the information recording media 7 and 7 ′, the image recording material 7 ′ whose image forming material is a polyester resin has poor image adhesion and is simple. I was peeled off.
The evaluation results are summarized in Table 1.

(Comparative Example 3)
Except for using 40 parts of polyester resin (Toyobo Co., Ltd .: Byron 200, Tg 67 ° C.) dissolved in 60 parts of methyl ethyl ketone instead of the urethane-modified acrylic resin of the adhesive layer coating liquid A-1 in Example 1 Then, the adhesive layer coating solution A-7 was prepared in the same manner as in Example 1, and the card core substrate sheet 8 was prepared in the same manner as in Example 1 and, with this, Example 1 and Similarly, information recording media 8 and 8 ′ were obtained.

<Evaluation of card core substrate sheet and information recording medium>
As a result of performing the same evaluation as in Example 1 on the card core base sheet 8 and the information recording media 8 and 8 ′, the image adhesiveness of the information recording medium 8 in which the image forming material is styrene-acrylic copolymer resin is used. It was bad and easily peeled off.
The evaluation results are summarized in Table 1.

(Example 6)
Instead of using the image transfer sheet for electrophotography of Example 1, an A4 size transparent laminate sheet (Dupont: Melinex 342, thickness: 100 μm) was used, and the same method as in Example 1 was applied to one side thereof. Using a color printer DocuPrint C 3540 (image forming material: styrene-acrylic copolymer resin) manufactured by Fuji Xerox Co., Ltd., color mirror image including a solid image is formed on 10 A4 size card size images. Thus, an image laminate sheet 9-U was produced. Similarly, ten mirror image characters having only character information were formed to produce an image laminate sheet 9-D. Similarly, an image laminate sheet 9'-U on which ten card-sized images are formed using the color composite machine DocuColor 1257 (image forming material: polyester resin) manufactured by Fuji Xerox Co., Ltd., and only character information. An image laminate sheet 9′-D having 10 mirror image characters formed thereon was produced.

<Production of information recording medium>
The image forming surface of the image laminate sheet 9-U and the image forming surface of the image laminate sheet 9-D on one side of the card core base sheet 1 are aligned on the other side. The layers were overlapped, and both sides thereof were overlapped by being sandwiched by a set of pressing plate members having a specular surface made of a SUS steel plate.
The laminate (pressing plate material / image laminate sheet 9-U / card base substrate sheet 1 / image laminate sheet 9-D / pressing plate material) subjected to the above positioning and superposition is 120 ° C., 5 kgf / cm ^2. After 30 seconds of heat pressing and cooling to room temperature, the pressing plate material was removed to obtain an information recording medium 9 on which an image was laminated. Further, the same operation was performed using the image laminate sheet 9′-U and the image laminate sheet 9′-D to obtain an information recording medium 9 ′ on which an image was laminated.

<Evaluation of information recording media>
The information recording mediums 9 and 9 ′ are subjected to a 90 ° bending test 100 times, and the fixing properties (peeling strength) of the images of the information recording media 9 and 9 ′ are confirmed on the basis of the degree of peeling of the laminate sheet after the bending test. did. The case where it was not peeled at all was marked with ◎, the case where peeling only at the bent portion was recognized, and the case where it was not peeled off was marked with ×. Other evaluations were the same as in Example 1.
The evaluation results are summarized in Table 1.

(Examples 7 to 10)
Using the card core sheets 2 to 5 produced in Examples 2 to 5, information recording media 10 to 13 and 10 'to 13' on which images were laminated were produced in the same manner as in Example 6. Example 6 The same evaluation was performed.
The evaluation results are summarized in Table 1.

(Comparative Examples 4 to 6)
Using the card core base materials 6 to 8 of Comparative Examples 1 to 3, information recording media 14 to 16 and 14 'to 16' on which images were laminated in the same manner as in Example 6 were obtained. Similar evaluations were made.
The evaluation results are summarized in Table 1.

DESCRIPTION OF SYMBOLS 10 Core base material 20 Adhesion layer 30 Image information 40 Core base sheet for cards 50 Image receiving layer 60 Base 70 Image holding film

Claims (5)

  A core substrate sheet for a card having a core substrate and an adhesive layer containing at least a urethane-modified acrylic resin provided on at least one surface of the core substrate.   The card core substrate sheet according to claim 1, wherein the urethane-modified acrylic resin is a graft polymer of an acrylic resin and a polyester-based urethane resin.   The core substrate sheet for a card according to claim 1, wherein the adhesive layer further contains a wax.   Information recording comprising: a core base material; an adhesive layer containing at least a urethane-modified acrylic resin provided on at least one surface of the core base material; and image information formed by a toner provided on the surface of the adhesive layer. Medium.   The information recording medium according to claim 4, wherein the binder resin constituting the toner is a styrene resin, an acrylic resin, or a styrene-acrylic copolymer resin.

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