JP4834967B2 - Core substrate sheet for card, information recording medium using the same, and information recording medium manufacturing method - Google Patents

Description

  The present invention relates to a card core base sheet for easily producing an information recording medium using an image recording body printed by an electrophotographic method, and an information recording medium and an information recording medium producing method using the same. In more detail, information cards with contactless personal information image information such as cash cards with face photos, employee cards, student cards, individual membership cards, residence cards, various driver's licenses, and various qualification certificates Media, RFID tag, core sheet for card that can be used for personal identification image sheet, image display board, display label, etc. used in medical field, and information recording medium and information recording medium manufacturing method using the same About.

  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.

  However, for example, the screen printing requires a large number of printing plates corresponding to the number of images to be printed, and in the case of color printing, printing plates corresponding to the number of colors are further required. Therefore, these printing methods are unsuitable for individually responding to individual identification information (face photo, name, address, date of birth, various licenses, etc.).

  The most mainstream image forming means for the above problems is an image forming method using a printer or the like employing a sublimation type or melting type thermal transfer system using an ink ribbon or the like. However, these can easily print personal identification information, but still have the problem that the resolution decreases when the printing speed is increased and the printing speed decreases when the resolution is increased.

  In contrast, in electrophotographic image formation (printing), the surface of the image carrier is uniformly charged, exposed in accordance with an image signal, and an electrostatic latent image due to a potential difference between an exposed portion and a non-exposed portion is generated. Then, an electrostatic latent image is developed with a color powder (image forming material) called toner having a polarity opposite to (or the same as) the charge, and a visible image (toner image) is formed on the surface of the image carrier. Is done through a process of forming. 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. A color image is formed 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. Is possible. In addition, the toner image formed on the surface of the image carrier can be almost completely transferred to the surface of the image recording body, and the toner image remaining slightly 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 a printed material for high-mix low-volume production.

  The toner is usually formed by melt-mixing a heat-meltable resin, a pigment, and optionally an additive such as a charge control agent, and pulverizing and finely pulverizing the kneaded product. Further, the electrostatic latent image in the electrophotographic method has a considerably higher resolution than the finely divided 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.

  Almost no consideration has been given to the heat resistance and light resistance of information recording media that are intended for outdoor use. However, if a driver's license is placed in a place exposed to 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 is an ABS resin film or polyolefin resin film that softens at a relatively low temperature, and a modification called PETG in which at least ethylene glycol, terephthalic acid and 1,4-cyclohexanedimethanol are copolymerized. A PET resin film, 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.
In addition, when it is assumed that the embossing is not performed when producing the card, a conventional biaxially stretched PET (polyethylene terephthalate) film or the like can be used. However, in any case, it is more expensive than the currently used vinyl chloride sheet, the printing characteristics of the conventional printing press are poor, and the embossing property (unevenness treatment of characters and the like) is also poor.

  In view of the above, there is a great demand for producing an information recording body at low cost by using a vinyl chloride sheet conventionally used for the base material (core) of various cards, and several studies have been made so far.

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 exists a method (refer patent document 1).

However, in the above sheet, the coefficient of friction between the sheets is too large, and the sheet is in close contact with each other, so that the sheet transportability is poor, the electrophotographic apparatus stops, or the insulating material (sheet of 250 μm or more as described above) ), Image forming material (toner) is not sufficiently transferred, and image defects may occur.
In addition, when an image is formed by using the above-described resin film that softens at a relatively low temperature in an electrophotographic apparatus, since the fixing temperature is higher than the softening temperature of the film in the fixing step, adhesiveness is developed, and the fixing apparatus There is a problem that winding jam occurs.
Furthermore, if the image forming material is offset to the fixing device or the fixing of the 250 μm thick sheet is continued, the fixing device may be damaged more than necessary at the edge (corner) of the sheet.

In addition, there is a method in which personal identification information is printed on a light-transmitting sheet, and the printing is performed as a mirror image (see Patent Document 2). However, in Patent Document 2, it is preferable that at least a part of the light-transmitting laminate sheet is a biaxially stretched polyester film, or a film made of ABS or polyester / biaxially stretched polyester film. It is only described as good.
Even if the image can be printed on the light-transmitting sheet, when laminating, air tends to remain between the sheets, resulting in bubbles and deteriorating the image quality.

  Therefore, in this specification, since the film is merely an insulator, the image quality is deteriorated due to poor transfer of the image forming material to the film surface or residual bubbles, and it is impossible to obtain the same resolution as the thermal transfer method. In this device, which focuses on improving productivity, the laminate sheet used is in the form of a roll, so it can be used for emergency or multi-product production such as different printing for one to several cards. Therefore, there is a problem that a lot of loss and waste occur.

  On the other hand, it has been reported that a urethane-polyester resin is used for a card sheet (see Patent Document 3). This technology uses a thermal crosslinking agent as a receiving layer (image receiving layer) for sublimation transfer printing. As a result, there is a problem that the pot life of the coating liquid for surface treatment is short, and the receiving layer is tacked. Force is generated, and a sufficient effect cannot be obtained in card jamming in a sublimation transfer printer. If the surface is roughened to reduce the friction coefficient in order to improve the transportability, there is a problem that the image quality print quality deteriorates.

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

  An object of the present invention is to solve the above problems. That is, the present invention provides an excellent image quality even when laminated with an image recording body under atmospheric pressure, adheres firmly to the image recording body when laminated, and further has excellent embossability. It is an object of the present invention to provide a material sheet, and an inexpensive information recording medium and information recording medium manufacturing method using the same.

The above-mentioned subject is achieved by the following present invention. That is, the present invention
<1>
In a core substrate sheet for a card having a core substrate containing a polyvinyl chloride resin as a main component and an adhesive layer provided on at least one side of the core substrate,
The adhesive layer contains a resin component containing at least a polyester resin and fine particles having an average particle diameter of 5 μm or more and 35 μm or less, and a mass ratio of the fine particles to the resin component is 0.5 parts of the fine particles with respect to 1 part of the resin component. a core substrate sheet for card according to claim to 2 parts der Rukoto.

<2>
The card according to <1>, including an information chip capable of reading and / or writing information by using at least one means selected from electrical means, magnetic means, and optical means Core base sheet.

<3>
An image recording body comprising a substrate and an image receiving layer provided on the substrate, wherein image information is recorded and formed on the image receiving layer using electrophotography, and described in <1> or <2> Card core substrate sheet,
An information recording medium, wherein either one of the surfaces of the image recording body and a surface on the side provided with an adhesive layer of the card core base sheet are laminated.

<4>
<3> The information recording medium according to <3>, wherein the substrate is a transparent sheet or a white sheet containing a white pigment.

<5>
<3> or <4>, wherein at least one surface of the substrate includes a polyester resin obtained by copolymerizing at least ethylene glycol, terephthalic acid, and 1,4-cyclohexanedimethanol component. It is.

<6>
A surface on which the image information is provided on an image recording medium on which the image information is recorded and formed as a mirror image and the base is transparent; and a surface on which the adhesive layer of the core substrate sheet for cards is provided. The information recording medium according to <4> or <5>, wherein is laminated by thermocompression bonding.

<7>
In the image recording body according to any one of <4> to <6>, wherein a functional control unit is provided on a surface opposite to the surface on which the image information is provided.
The information recording medium characterized in that the functional control means has at least one function selected from the functions of controlling glossiness, light resistance, antibacterial properties, flame retardancy, releasability and chargeability. It is.

<8>
The information recording medium according to any one of <3> to <7> includes any one surface of the image recording body and a surface on which the adhesive layer of the core base sheet for cards is provided. An information recording medium manufacturing method characterized by being manufactured through a process of laminating by thermocompression bonding.

<9>
A surface on which the image information is provided on an image recording medium on which the image information is recorded and formed as a mirror image and the base is transparent; and a surface on which the adhesive layer of the core substrate sheet for cards is provided. The method for producing an information recording medium according to <8>, wherein the method is produced through a step of laminating the film by thermocompression bonding.

<10>
The surface of the image recording body opposite to the surface on which the image information is provided is selected from functions that control glossiness, light resistance, antibacterial properties, flame retardancy, release properties, and charging properties. <9> The method for producing an information recording medium according to <9>, wherein functional control means having at least one function is provided.

<11>
The method for producing an information recording medium according to any one of <6> to <10>, wherein the thermocompression bonding is performed under atmospheric pressure.

  As described above, according to the present invention, excellent image quality can be obtained even when laminated with an image recording body under atmospheric pressure, and it adheres firmly to the image recording body when laminated, and also has embossability. An excellent card core substrate sheet, an inexpensive information recording medium using the same, and an information recording medium manufacturing method can be provided.

(Card Core Base Sheet, Information Recording Medium Using the Same, and Information Recording Medium Manufacturing Method)
The card core substrate sheet of the present invention (hereinafter sometimes abbreviated as “core sheet”) includes a core substrate containing a polyvinyl chloride resin as a main component, and an adhesive provided on at least one side of the core substrate. In the card core substrate sheet having a layer, the adhesive layer contains at least a resin component containing a polyester resin and fine particles having an average particle diameter of 5 μm or more and 35 μm or less, and a mass ratio of the fine particles to the resin component is and wherein said fine particles 0.5 to 2 parts der Rukoto respect to the resin component, 1 part.
Therefore, according to the present invention, an excellent image quality can be obtained even when laminated with an image recording body under atmospheric pressure, and it adheres firmly to the image recording body when laminated, and further has excellent embossability. A core substrate sheet can be provided.

  The adhesive layer provided on the core sheet of the present invention can ensure strong adhesion to the image recording material after lamination, and is laminated when being laminated under atmospheric pressure. Since air can be efficiently released from the interface, an information recording medium having excellent image quality can be obtained. Further, this adhesive layer exhibits adhesiveness in a temperature range (heating temperature at the time of laminating, that is, a range of about 90 to 120 ° C.) where the toner image formed on the image recording body does not flow and collapse during laminating. If the core sheet of the present invention is used, an information recording medium on which image information is recorded and formed using electrophotography can be produced.

On the other hand, conventionally used core sheets made of polyvinyl chloride resin (hereinafter abbreviated as “PVC core sheet”) directly transfer image information to the core sheet by printing using ink or thermal transfer using an ink ribbon. It is used for recording to produce an information recording body, or it is used for producing an information recording medium by laminating in combination with a recorded image recording body. In this case, the laminating temperature is about 150 to 170. It is about ℃.
Therefore, even if a vinyl chloride core sheet is used as a core sheet for producing an information recording medium on which image information is recorded and formed using electrophotography, it is necessary to laminate at a high temperature. The toner image is fluidized and deteriorates.
However, since the core sheet of the present invention is provided with an adhesive layer on at least one side of a core base material containing a polyvinyl chloride resin as a main component, image information (toner image) is deteriorated by heating during lamination. There is no.

Sheets containing polyvinyl chloride resin (hereinafter sometimes abbreviated as “vinyl chloride resin”) as a main component are mainly resins other than polyvinyl chloride resin (hereinafter sometimes abbreviated as “non-vinyl chloride resin”). Since the embossability is superior to the sheet containing as a component, it is possible to easily form characters and symbols with sufficient irregularities in the thickness direction of the medium on the surface of the information recording medium. It has a feature that defects such as cracking during processing are less likely to occur.
However, with a sheet using a non-vinyl chloride resin that can be adapted to conventional electrophotographic methods and softens at a relatively low temperature, the embossing itself is difficult or the embossability is inferior to that of the PVC sheet.

  As described above, the core sheet using the conventional vinyl chloride resin cannot be used for the production of an information recording medium using the electrophotographic method, and the sheet using the non-vinyl chloride resin can be used for the electrophotographic method. In some cases, there is a problem that the embossability is insufficient, and both cannot be made compatible. However, the core sheet of the present invention can achieve both the production of an information recording medium using electrophotography and the embossability.

Hereinafter, the constituent material and configuration of the core sheet of the present invention will be described in more detail.
-Adhesive layer-
The adhesive layer is not limited as long as it contains a polyester resin and fine particles, and various additives such as a charge control agent can be added as necessary. Hereinafter, the polyester resin and the fine particles, which are essential components of the adhesive layer, will be described.

-Polyester resin-
The polyester resin used for the adhesive layer of the core sheet of the present invention is preferably a saturated polyester resin obtained by a condensation reaction of a polybasic acid component having two or more carboxyl groups and a glycol component.

As the polybasic acid, divalent basic acid aromatic dicarboxylic acids can be used. For example, terephthalic acid, isophthalic acid, orthophthalic acid, naphthalenedicarboxylic acid, biphenyldicarboxylic acid, 1,5-naphthalic acid, etc. are used. It is done. Also, aromatic oxycarboxylic acids such as p-oxybenzoic acid and p- (hydroxyethoxy) benzoic acid, and tri- and tetra-aromatic carboxylic acids such as trimellitic acid and pyromellitic acid can be used in combination.
Examples of the aliphatic dicarboxylic acid include succinic acid, adipic acid, sebacic acid, azelaic acid, dodecanedioic acid, and dimer acid. Examples of the alicyclic dicarboxylic acid include 1,4-cyclohexanedicarboxylic acid, 1,3-cyclohexanedicarboxylic acid, 1,2-cyclohexanedicarboxylic acid and its anhydride.

Further, dicarboxylic acids having a polymerizable unsaturated double bond can also be used. For example, α, β-unsaturated dicarboxylic acids include fumaric acid, maleic acid, maleic anhydride, itaconic acid, citraconic acid, unsaturated double bonds. As the alicyclic dicarboxylic acid containing a bond, 2,5-nobornene dicarboxylic acid anhydride, tetrahydrophthalic anhydride, or the like can be used. Most preferred among these are fumaric acid, maleic acid, itaconic acid, and 2,5-nobornene dicarboxylic acid anhydride.
Furthermore, hydroxycarboxylic acids such as hydroxypivalic acid, γ-butyrolactone, and ε-caprolactone can be used as necessary.
These components can be used alone or in combination of two or more.

On the other hand, the glycol component can be at least one selected from aliphatic glycols having 2 to 10 carbon atoms, alicyclic glycols having 6 to 12 carbon atoms, and ether bond-containing glycols.
Examples of aliphatic glycols having 2 to 10 carbon atoms include ethylene glycol, 1,2-propylene glycol, 1,3-propanediol, 1,4-butanediol, 1,5-pentanediol, neopentyl glycol, 1, Examples include 6-hexanediol, 3-methyl-1,5-pentanediol, 1,9-nonanediol, 2-ethyl-2-butylpropanediol, hydroxypivalic acid neopentylglycol ester, dimethylolheptane, and the like. .

Examples of alicyclic glycols having 6 to 12 carbon atoms include 1,4-cyclohexanedimethanol and tricyclodecane dimethylol.
Examples of the ether bond-containing glycols include diethylene glycol, triethylene glycol, dipropylene glycol, and glycols obtained by adding 1 to several moles of ethylene oxide or propylene oxide to two hydroxyl groups bonded to the aromatic ring of bisphenols, An example is 2,2-bis (4-hydroxyethoxyphenyl) propane. Polyethylene glycol, polypropylene glycol, and polytetramethylene glycol can also be used as necessary.

  Examples of the organic diisocyanate compound include hexamethylene diisocyanate, tetramethylene diisocyanate, 3,3-dimethoxy-4,4′-biphenylene diisocyanate, p-xylylene diisocyanate, m-xylylene diisocyanate, 1,3-diisocyanate-methylcyclohexane, 1 , 4-diisocyanate-methylcyclohexane, 4,4′-diisocyanate dicyclohexylmethane, isophorone diisocyanate, 2,4-tolylene diisocyanate, 2,6-tolylene diisocyanate, p-phenylene diisocyanate, diphenylmethane diisocyanate, m-phenylene diisocyanate, 2 , 4-Naphthalene diisocyanate, 3,3′-dimethyl-4,4′-biphenylene diisocyanate, 4,4 - diisocyanate diphenyl ether, 1,5-naphthalene diisocyanate, and the like. Of these, hexamethylene diisocyanate, tetramethylene diisocyanate, isophorone diisocyanate and diphenylmethane diisocyanate are preferred.

  Examples of chain extenders include ethylene glycol, propylene glycol, neopentyl glycol, 2,2-diethyl-1,3-propanediol, polyethylene glycol, diethylene glycol, polypropylene glycol, polytetramethylene glycol, tricyclodecane dimethylol, bisphenol. A ethylene oxide adduct, 1,4-cyclohexanedimethanol, etc. are mentioned. Of these, ethylene glycol, polyethylene glycol, neopentyl glycol, diethylene glycol and bisphenol A ethylene oxide adduct are more preferable.

  The polyester resin can be synthesized in a known manner, for example, in a solvent at a reaction temperature of 20 to 150 ° C. in the presence of a catalyst such as amines and organotin compounds, or in the absence of a catalyst. Examples of the solvent that can be used at this time include ketones such as methyl ethyl ketone, methyl isobutyl ketone, and cyclohexanone, aromatic hydrocarbons such as toluene and xylene, and esters such as ethyl acetate and butyl acetate.

  These polyester resins may be used alone or in combination of two or more. Furthermore, in order to further improve the adhesiveness or improve the blocking property, a conventionally known resin can be mixed as necessary and used as a resin material constituting the adhesive layer.

The content of the polyester resin contained in the adhesive layer is not particularly limited, but is preferably in the range of 20 to 100% by weight, and more preferably in the range of 50 to 100% by weight.
When the content of the polyester resin contained in the adhesive layer is smaller than 20% by weight, it may be difficult to easily and firmly adhere and laminate.

-Fine particles-
The adhesive layer of the core sheet of the present invention contains fine particles having an average particle diameter of 5 μm or more and less than 35 μm. The fine particles are preferably contained at least near the surface of the adhesive layer.

The fine particles contained in the adhesive layer are preferably fixed to the adhesive layer so as to be exposed slightly outside the plane of the adhesive layer surface and not fall off from the adhesive layer surface. In this state, the fine particles present on the surface of the adhesive layer can reduce the coefficient of friction of the core sheet surface (the surface on which the adhesive layer is provided), so that a toner image is formed when laminating. In addition, it is possible to improve the transportability of the core sheet in the registration device that overlaps with the image recording medium.
In addition, the presence of fine particles that form protrusions slightly outside the plane of the adhesive layer surface allows efficient airflow between the image recording surface and the adhesive layer surface, particularly when laminating under atmospheric pressure. Therefore, it is possible to suppress and prevent air bubbles from remaining at the interface between the core sheet and the image recording body.

  The size of the fine particles used for such a purpose is required to be in the range of 5 to 35 μm in average particle diameter, and more preferably in the range of 15 to 25 μm. The average particle diameter of the fine particles is basically selected in accordance with the thickness of the adhesive layer containing the fine particles, and is selected so that a part of the fine particles is easily exposed and fixed on the surface of the adhesive layer. It is preferable. The average particle size of the fine particles satisfying such conditions depends on the coating conditions when the adhesive layer is formed on the surface of the core substrate, but is, for example, the same as or slightly larger than the thickness of the adhesive layer (the thickness of the adhesive layer). -Thickness of adhesive layer + about 5 μm).

  Here, the thickness of the adhesive layer is determined so that the toner image formed on the surface of the image recording body is secured on the adhesive layer side when laminating with the surface on which the toner image of the image recording body is formed during lamination. In order to prevent the image from being unnecessarily crushed and becoming bold (deteriorated) without being embedded, the thickness is required to be at least about 5 μm, and more preferably 15 μm or more.

  Therefore, when the thickness of the adhesive layer is about 5 μm, which is a practical lower limit, the average particle diameter is 5 μm so that the fine particles are easily fixed in a state where a part is exposed on the surface of the adhesive layer. Or it needs to be a little over 5 micrometers. When the average particle diameter is less than 5 μm, in the adhesive layer having a thickness of 5 μm, most of the fine particles are buried in the adhesive layer, so that the transportability of the core sheet in the apparatus is deteriorated, and a transport trouble occurs. When laminating at atmospheric pressure, bubbles remain at the interface between the core sheet and the image recording body.

  On the other hand, when the average particle diameter of the fine particles exceeds 35 μm, the presence of such large-sized fine particles itself deteriorates the image quality. Therefore, fine particles having an average particle diameter exceeding 35 μm are not used, and the thickness of the adhesive layer is 35 μm in order to avoid unnecessary use of an adhesive layer constituting material such as a polyester resin constituting the adhesive layer more than necessary. It is preferable that it is about or less, more preferably 30 μm or less.

In addition, the average particle diameter and particle size distribution index of the fine particles used in the present invention are obtained using Coulter Counter TA II (manufactured by Beckman-Coulter) and using ISOTON-II (manufactured by Beckman-Coulter) as the electrolyte. Can be measured.
As a measuring method, 0.5 to 50 mg of a measurement sample was added to 2 ml of a 5% aqueous solution of a surfactant, preferably sodium alkylbenzenesulfonate as a dispersant, and this was added to 100 to 150 ml of the electrolytic solution. The electrolytic solution in which the measurement sample is suspended is subjected to a dispersion treatment with an ultrasonic disperser for about 1 minute. Using the Coulter counter TA-II type, an aperture having an aperture diameter of 60 μm is used. The particle size distribution of particles in the range of 40 μm was measured.
Subsequently, for the divided particle size range (channel), a cumulative distribution is drawn from the small diameter side with respect to the divided particle size range (channel). At this time, a particle size that becomes 50% cumulative is defined as a volume average particle size D50v. . The volume average particle diameter D50v thus determined was taken as the average particle diameter of the fine particles used in the present invention.

  The material for the fine particles used in the present invention is not particularly limited. Specifically, in the case of those composed of organic resin particles, specifically, styrenes such as styrene, vinyl styrene, chlorostyrene; ethylene, propylene, butylene, isobutylene. Monoolefins such as vinyl acetate, vinyl propionate, vinyl benzoate, vinyl butyrate, etc .; methyl acrylate, ethyl acrylate, butyl acrylate, dodecyl acrylate, octyl acrylate, phenyl acrylate, methacryl Esters of α-unsaturated fatty acid monocarboxylic acids such as methyl acrylate, ethyl methacrylate, butyl methacrylate, dodecyl methacrylate; vinyl ethers such as vinyl methyl ether, vinyl ethyl ether, vinyl butyl ether; vinyl methyl ketone, vinyl Kishiruketon, 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.

  Of these, styrenes and esters of α-unsaturated fatty acid monocarboxylic acids are preferred. When a heat-meltable resin is used as fine particles and an adhesive layer is formed (coated), a coating solution for forming an adhesive layer containing a solvent that does not dissolve the resin component constituting these fine particles can be used. Fine particles are prepared using a thermosetting resin, thermosetting resin, photocurable resin, electron beam curable resin, etc., which has a crosslinked structure by adding a crosslinking agent to these thermomeltable resins. More preferably.

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

The shape of the fine particles is generally spherical particles, but 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 substrate sheet, it is necessary to reduce the friction of the sheet surface by the fine particles. However, in actual use, the core sheet surface (the side on which the adhesive layer is provided) Of the surface (adhesive layer side surface)) is preferably 2 or less, more preferably 1 or less. The dynamic friction coefficient of the core sheet surface (adhesive layer side surface) is preferably in the range of 0.2 to 1, and more preferably in the range of 0.3 to 0.65.

The mass ratio (fine particles: adhesive) of the fine particles and the adhesive (resin component including the polyester resin described above) in the adhesive layer is such that the compounding amount of the fine particles relative to 1 part of the adhesive is 0 . Area by Der of 5 to 2 parts.
When the blending amount of the fine particles with respect to 1 part of the adhesive is within the above range, the image quality after lamination is stable and a high quality image is obtained. The core sheets may adhere to each other when stored repeatedly. On the other hand, when the amount is larger than the above range, the adhesive strength between the core sheet after lamination and the image recording body may not be sufficiently secured.

-Core substrate-
The core substrate used in the core sheet of the present invention is not particularly limited as long as it contains a polyvinyl chloride resin as a main component, but contains 50% by weight or more of polyvinyl chloride resin in order to obtain excellent embossability. It is preferable that it consists only of a polyvinyl chloride resin.
Other resins that can be used in combination with the polyvinyl chloride resin are not particularly limited. For example, polystyrene resin, ABS (acrylonitrile-butadiene-styrene) resin, AS (acrylonitrile-styrene) resin, and polyethylene terephthalate (PET). And polyolefin resins such as polyethylene and polypropylene.

Further, the core substrate may be transparent or colored, but when colored, it is preferably white.
When the core substrate is transparent, a white unprinted laminate film is used as a sheet (hereinafter sometimes abbreviated as “unprinted laminate film”) that carries the toner image of the image recording medium, and an information recording medium is used. When manufactured, the information recording medium can be obtained by laminating with the core sheet so that the surface (image bearing surface) on which the toner image is carried is the outside.
On the other hand, when the core substrate is white, a white or transparent one can be used as the unprinted laminate film. When a transparent unprinted laminate film is used, it can be laminated with the core sheet so that when the information recording medium is produced, the image carrying surface is either on the outside or on the inside (laminate surface). In addition, when laminating with the image carrying surface facing inward, the image formed on the unprinted laminate film needs to be a mirror image. Further, when laminating with the image bearing surface on the inside, there is an advantage that the functional control means can be provided on the surface of the image recording body opposite to the image bearing surface.

  The functional control means preferably has at least one function selected from functions for controlling glossiness, light resistance, antibacterial properties, flame retardancy, mold release properties, and chargeability. Specifically, the surface opposite to the image bearing surface is glossy, light resistant, antibacterial, flame retardant, releasable, conductive, more preferably moisture resistant, heat resistant, water repellent, water resistant. It is provided to add and / or improve various functions such as wear and scratch resistance. Thereby, the information recording medium having the functionality control means can be resistant to various usage conditions.

  In addition, as a method of coloring the core substrate white, a method of adding a white pigment, for example, metal oxide fine particles such as silicon oxide, titanium oxide, and calcium oxide, an organic white pigment, polymer particles, and the like can be used.

  The polyvinyl chloride resin contained in the core substrate is soluble in a general solvent used in the adhesive layer forming coating solution used when forming the adhesive layer on the surface of the core substrate. is doing. In this case, since the dissolved component is compatible with the polyester resin contained in the adhesive layer, the core substrate and the adhesive layer are firmly bonded to each other, and peeling between the two can be prevented. Moreover, even if it peels, it cannot peel cleanly in an interface part. For this reason, when an information recording medium is produced using the core sheet of the present invention, forgery can be reliably prevented.

  In addition, the polyvinyl chloride resin is not only excellent in compatibility with the coating solution for forming the adhesive layer, but the core sheet of the present invention using the polyvinyl chloride resin is a problem using the existing existing apparatus. An information recording medium can be manufactured.

The core substrate used in the present invention is preferably composed of two or more layers from the viewpoint of laminating properties.
In this case, for example, it is preferable that at least one of the layers forming the outer surface of the core base material contains a polyester resin, and the other layer may be a layer made of only a vinyl chloride resin.
Even if the core base material is composed of only a single layer of polyvinyl chloride, it is excellent in laminating properties. However, the core sheet containing such a core base material is used for producing an information recording medium without an image or forgery that cannot be recognized by humans. It is preferable to use it when producing an information recording medium to which preventive measures are taken.
Further, the thickness of the core base material used in the present invention is within the range of 50 to 5000 μm from the viewpoint of securing strength and appropriate thickness although it depends on the thickness of the information recording medium to be finally produced. Is preferable, and it is more preferable that it exists in the range of 100-1000 micrometers.

When the information recording medium produced using the core sheet of the present invention also uses an information source other than image information (toner image) visually recognized as an information source, the core sheet of the present invention is It is preferable to include an information chip capable of reading and / or writing at least information by using at least one means selected from electrical means, magnetic means, and optical means. In this case, the information chip is preferably arranged inside or on the surface of the core base material (laminated surface when used as an information recording medium).
The information chip is not particularly limited as long as it can read and write information by using at least one of the above three means. A known chip can be used, but an IC chip (semiconductor circuit) is typically used. ).

  As a method of incorporating an information chip such as a semiconductor circuit in a core base material, a sheet called an inlet to which the semiconductor circuit is fixed is sandwiched between sheet materials constituting the core base material, and heat fusion is integrated by heat press. In general, a method of making the alkenyl is preferably used. Further, it is also possible to arrange a semiconductor circuit directly without the inlet sheet and to integrate it by heat fusion.

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 such as a semiconductor circuit in an IC card can be applied as a method of manufacturing a core substrate.
Furthermore, if there is no problem in use as an information recording medium, an information chip such as a semiconductor circuit may be arranged in an exposed state on the surface (outside surface when used as an information recording medium) instead of inside the core base material. Is possible.

  In addition, when the information recording medium of the present invention is used not only as an IC card using a semiconductor circuit as an information chip but also as a magnetic card or the like, an antenna, a magnetic stripe, External terminals etc. are embedded. Moreover, a magnetic stripe, a hologram, etc. may be printed.

Moreover, since the core base material of the present invention includes a polyvinyl chloride resin suitable for embossing, the core sheet of the present invention can be obtained by embossing characters and symbols such as a cash card owner name and account number. It can also be easily formed on an information recording medium produced using this core sheet.
Therefore, the information recording medium produced using the core sheet of the present invention can not only provide image information using electrophotography suitable for high-definition, high-mix low-volume production, but also character information by embossing. Therefore, the degree of freedom of design is higher than that of a conventional information recording medium, and the appearance can be improved.

-Method for forming adhesive layer-
Formation of the adhesive layer on the core substrate can be performed as follows. First, a polyester resin, fine particles, and other components added as necessary are mixed using an organic solvent or water, and uniform using an apparatus such as an ultrasonic wave, a wave blower, an attritor or a sand mill. An adhesive layer-forming coating solution is prepared by dispersing in an aqueous solution. Next, the coating liquid is applied or impregnated on the surface of the core base material as it is, to form a coating film, and then dried to form an adhesive layer.

  As coating or impregnation methods, blade coating methods, wire bar coating methods, spray coating methods, dip coating methods, bead coating methods, air knife coating methods, curtain coating methods, roll coating methods, screen printing methods, etc. are usually used. Can be used.

  However, it is preferable to use a good solvent that dissolves the surface of the core substrate as the solvent used in the preparation of the coating solution. When such a good solvent is used, when the coating liquid is applied to the surface of the core substrate, the surface of the core substrate is dissolved, and the dissolved component works as a binder resin. In addition, the bonding force with the fine particles dispersed in the adhesive layer becomes very high, so that it is easy to stably hold the fine particles.

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, when the core substrate used for the production of the core sheet of the present invention is composed of two or more layers, the side on which the adhesive layer of the core substrate is formed It is preferable that the surface (layer) contains a polyvinyl chloride resin excellent in compatibility with a general solvent used in the coating liquid, and further, it is composed of a layer made only of the polyvinyl chloride resin. More preferably.

  The solvent that brings out compatibility between the vinyl chloride resin contained on the surface of the core substrate and the resin component such as polyester resin contained in the adhesive 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 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 can be easily dried by heat drying. As a drying method, a generally used method such as a method of putting in an oven, a method of passing through an oven, or a method of contacting with a heating roller can be adopted.

The structure of the core sheet demonstrated above is demonstrated using drawing.
FIG. 1 is a schematic cross-sectional view showing an example of the core sheet of the present invention. In FIG. 1, 10 is a (first) adhesive layer, 20 is a core substrate, and 30 is a second adhesive layer.
The core sheet shown in FIG. 1A has a configuration in which an adhesive layer 10 containing fine particles (not shown) and a core base material 20 are overlapped and joined.

  Further, as shown in FIG. 1 (b), another adhesive layer may be provided in the configuration illustrated in FIG. 1 (a). Specifically, both layers of the core substrate 20 are not shown. The first adhesive layer 10 containing the fine particles and the second adhesive layer 30 may be superposed and bonded.

(Information recording medium manufacturing method)
Next, an information recording medium manufacturing method suitable for manufacturing the information recording medium of the present invention will be described.
The information recording medium of the present invention is an image recording body (hereinafter sometimes abbreviated as “laminate film”) in which a toner image (fixed or unfixed) is provided on its surface (at least a laminate surface). It is produced through at least a laminating step in which any one surface and a surface provided with an adhesive layer of a core substrate colored transparent, white or other than white are overlapped and bonded (laminated) by thermocompression bonding.

-Laminate film (image recording material)-
The laminate film is composed of a substrate such as a PET film and an image receiving layer provided on at least one surface of the substrate, and a toner image is formed on the surface provided with the image receiving layer. Further, if necessary, the functional control means can be provided on the surface on which the image receiving layer is not provided.

  Further, at least one surface of the substrate constituting the laminate film may be abbreviated as a polyester resin (hereinafter referred to as “PETG resin”) obtained by copolymerizing at least ethylene glycol, terephthalic acid and 1,4-cyclohexanedimethanol component. ) Is preferably included.

  When at least one surface of the substrate contains a PETG resin, a coating layer is formed by applying a coating solution to the surface of the substrate containing at least the PETG resin when forming a laminate film. When the functional control means) is formed, the compatibility between the resin and the like contained in the coating liquid and the substrate surface becomes good. Therefore, the surface of the substrate containing the PETG resin and the coating layer provided in contact with the substrate surface can be firmly bonded to prevent peeling. Moreover, even if it peels, it cannot peel cleanly in an interface part. For this reason, when it is set as an information recording medium using a laminate film and the core sheet of this invention, forgery can be prevented reliably. In addition, it is preferable that a coating layer is provided only in the surface containing PETG resin from a viewpoint of peeling prevention or forgery prevention.

In addition, PETG resin is not only excellent in compatibility with a coating solution, but among resins that can be used as a substrate, it is easy to produce a laminate film and an information recording medium using the same using an existing apparatus. . In addition, information recording media manufactured using laminate films, such as sunlight and fluorescent lamps, are less exposed to light exposed to normal usage conditions than conventional resins used as materials for the substrate. It is hard to turn yellow and has excellent light resistance.
The PETG resin may be any resin as long as at least ethylene glycol, terephthalic acid and 1,4-cyclohexanedimethanol components are copolymerized, and may contain other components.

-Toner image formation-
In the case where a toner image is formed on an unprinted laminate film by the electrophotographic method, the toner image is formed on the unprinted laminate film by the electrophotographic method as described below. First, the surface of the photoconductor (image carrier) is uniformly charged and charged, and then the obtained image information is exposed on the surface to form an electrostatic latent image corresponding to the exposure. Next, toner as an image forming material is supplied from the developing device to the electrostatic latent image on the surface of the photoreceptor, so that the electrostatic latent image is visualized and developed with the toner (a toner image is formed). Further, the formed toner image is transferred to the surface of the unprinted laminate film on which the image receiving layer is formed, and finally the toner image is fixed on the surface of the image receiving layer by heat, pressure, etc. A toner image fixed on the toner image is formed.
Note that the fixing process may be omitted, and the unfixed toner image may be simply transferred to the surface of the unprinted laminate film. In this case, fixing can be performed using heat treatment during lamination.

  Since a material having good adhesion to the toner is used for the surface of the image receiving layer provided on the surface of the laminate film, the toner can be sufficiently fixed on the surface of the laminate film at a temperature lower than the temperature at which the toner melts and becomes viscous.

  For this reason, it is preferable to fix the toner image formed on the surface of the laminate film so that the temperature of the surface of the laminate 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 surface temperature of the laminate film be 130 ° C. or lower, more preferably 110 ° C. or lower.

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

-Functionality control means-
In the case where the laminate film has an image receiving layer on one side and the other side has a functional control means, the functional control means is provided with the image forming surface as the laminated surface. It is preferable to laminate with the surface facing outside to impart various functions to the information recording medium. In addition, the functional control means provided in a laminate film can select the same thing as the functional control means provided in the core sheet of this invention mentioned above.

  On the other hand, when the laminate film is white, an image is formed by a normal developing method, and in the lamination with the core sheet, the surface on which the toner image is not formed is defined as the laminate surface. In this case, it is inevitably impossible to provide a functional control means for the laminate film.

-Lamination process-
For the process of laminating any one surface of the image recording medium and the surface provided with the adhesive layer of the core sheet by thermocompression bonding (laminating process), any of various conventionally known laminating techniques and laminating apparatuses are preferably employed. can do. However, in the production of the information recording medium of the present invention, for example, a heat press method (hereinafter referred to as “roll”) in which a laminate in which a laminate film and a core sheet are superposed is inserted while being heated between a pair of rolls. May be abbreviated as “press”.
However, in particular, in the method for producing an information recording medium of the present invention, a laminate in which the core sheet and the laminate film are overlapped is disposed between a pair of pressing plate members, and then the laminate is treated as the above-described 1. It is preferable to use a heat press method (hereinafter, may be abbreviated as “plate material press”) in which heating is performed through a pair of pressing plate materials while heating.

  In addition, the lamination can be performed under reduced pressure in order to prevent bubbles from entering the interface formed by the lamination. However, since the core sheet of the present invention is used in the production of the information recording medium of the present invention, the air between the laminate film and the core sheet is efficiently released even at the atmospheric pressure and laminated to the interface. An information recording medium without bubbles can be manufactured.

(Information recording medium)
Next, an information recording medium using the card core substrate sheet of the present invention described above will be described.
As such an information recording medium, (1) at least a laminate film in which a toner image corresponding to information is formed on a laminate surface, and a transparent, white or colored core sheet which is overlapped and bonded to the laminate film are provided. And (2) a laminate film having a toner image formed on the laminate surface, a transparent, white or colored core sheet that is overlapped and bonded to the laminate film, the inside of the core sheet, and the core sheet The structure which contains at least the information chip arrange | positioned in at least any one place of the surface on the opposite side to a lamination surface and the joining surface of the said laminate film and the said core sheet is mentioned.

  In addition, it is preferable that at least the surface on the laminate side of the laminate film used for producing the information recording medium of the present invention contains at least a urethane-modified polyester resin. In this case, when the laminate film and the core sheet of the present invention are laminated, both can be bonded more firmly.

  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 can be visually identified, and may be mechanically identifiable.

Further, in the information recording medium shown in the above item (2), the information chip has information having some kind of identification function, and the information chip described above can be used as this information chip.
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 can 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 invention can be applied to cash cards, employee cards, student cards, individual 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.

  The information recording medium of the present invention described above is obtained by laminating a laminate film provided with a toner image with a core sheet of the present invention having a laminated surface that is transparent, white or colored, and bonding (laminating) it in a laminating process. Produced.

  Lamination film and core sheet may be overlapped by holding and aligning laminate film and core sheet by hand, or laminating film and core sheet sequentially on collated tray provided after image formation. It may be performed by discharging and automatically aligning.

  The pressure-bonding method in the laminating step is not particularly limited, and any of various conventionally known laminating techniques and laminating apparatuses can be suitably employed. Among these, it is preferable to use a heat press method of laminating by applying heat. For example, a laminate of a laminate film and a core sheet is inserted into a pressure contact portion (nip portion) of a pair of heatable heat rolls. Thus, they can be pressure-bonded by using a normal laminating technique and a laminating apparatus in which both are melted to some extent and thermally fused.

  When a laminate film (unfixed laminate film) on which an unfixed toner image has been formed without passing through the above-described fixing process is used in the laminating process, the temperature during laminating is used when using a laminated film that has undergone the fixing process. By making it slightly higher than that, it is possible to ensure the color development of the toner.

  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 laminate film, the laminate is cut for each image, and a plurality of pieces of information of a predetermined size are obtained. A recording medium can be obtained.

  When the information recording medium of the present invention is used as an IC card or the like using an information chip such as an IC chip, as described above when the information recording medium is finally produced, The information chip should just be arrange | positioned in at least any one place of the surface on the opposite side to the lamination surface of a sheet | seat, and the joining surface of a laminate film and a core sheet. However, in production, a material having an information chip inside or on the surface of the core sheet can be used practically. The method for incorporating the information chip in the core sheet is as described above.

Next, specific examples of the information recording medium of the present invention described above will be described with reference to the drawings. FIG. 2 is a schematic sectional view showing an example of the information recording medium of the present invention. In FIG. 2, 100 is a (first) laminate film, 200 is a core sheet (core sheet of the present invention), and 300 is a second laminate film.
The information recording medium shown in FIG. 2 (a) has a configuration in which a laminate film 100 and a core sheet 200 that is a laminate are overlapped and joined. As the core sheet 200 shown in FIG. 2A, the core sheet shown in FIG. 1A in which an adhesive layer (not shown) is provided on the laminate film 100 side is used.

Further, as shown in FIG. 2 (b), another laminate film may be overlapped and joined to the configuration illustrated in FIG. 2 (a). Specifically, on both surfaces of the core sheet 200 ′, Each may have a configuration in which the first laminate film 100 and the second laminate film 300 are overlapped and joined. As the core sheet 200 ′ shown in FIG. 2B, the core sheet shown in FIG. 1B in which adhesive layers (not shown) are provided on both surfaces thereof is used.
Furthermore, it is good also as a structure which provided the sheet | seat, layer, etc. other than the above as needed.

  Hereinafter, the present invention will be described more specifically with reference to examples, but the present invention is not limited thereto. In the examples and comparative examples below, “parts” means “parts by weight”.

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

<Preparation of adhesive layer coating solution A-1>
A solution containing a polyester resin (Toyobo Co., Ltd .: Byron UR1350, 50% by weight of methyl ethyl ketone / 50% by weight of toluene containing a polyester resin as a solid content of 33% by weight) 50 parts of polymer fine particles (manufactured by Soken Chemical Co., Ltd .: MX-3000, average particle size: 30 μm) and 50 parts of cyclohexanone as a solvent were added and mixed, and stirred sufficiently to prepare an adhesive layer coating solution A-1. .

<Preparation of core substrate sheet for card>
The adhesive layer coating solution A-1 is applied on one side of a B4 size white vinyl chloride sheet (Taihei Chemicals Co., Ltd. product: Ebilon HS727, total thickness: 500 μm) using an applicator, and 30 minutes at 50 ° C. Dry, and apply the same treatment to the other side to form an adhesive layer with a thickness of 25 μm on the front and back sides, and cut this into A4 size (210 mm × 297 mm) to produce the core substrate sheet 1 for cards. did.
In addition, when the surface on which the adhesive layer of the card core substrate sheet 1 is provided is observed with an optical microscope, the fine particles are present in a state where a part thereof is exposed on the surface of the adhesive layer. confirmed.

<Preparation of laminate film for electrophotography>
(Preparation of image-receiving layer coating solution B-1)
10 parts of polyester resin (manufactured by Soken Chemical Co., Ltd .: Foret FF-4M, solid content 30% by mass in methyl ethyl ketone solution), cross-linked methacrylate copolymer fine particles (manufactured by Soken Chemical Co., Ltd .: MX-300, volume average) as a matting agent (Particle size: 3 μm) 0.05 parts, 0.2 parts of a surfactant (manufactured by NOF Corporation: Elegan 264WAX), 10 parts of toluene and 30 parts of methyl ethyl ketone are added to the mixed solvent and stirred sufficiently to obtain an image. Layer coating solution B-1 was prepared.

(Preparation of functional control layer coating liquid C-1)
10 parts of silicone resin (GE Toshiba Silicone Co., Ltd .: SHC900, solid content 30% by weight) as thermosetting resin, and polydimethylsiloxane fine particles (GE Toshiba Silicone Co., Ltd .: TP145, average particle size: 4.5 μm) 0 as filler 4 parts, 0.2 part as a charge control agent (manufactured by Takemoto Yushi Co., Ltd .: Pionein B144V), and 2- (2-hydroxy-5-methylphenyl) -2H-benzotriazole (manufactured by Sumitomo Chemical Co., Ltd.) as an ultraviolet absorber : Sumisorb200) 0.3 part and 0.03 part of calcium phosphate inorganic antibacterial agent (Sangi Co., Ltd .: Apacider AW) carrying silver as an antibacterial agent were mixed with cyclohexanone and methyl ethyl ketone at a mass ratio of 10:90. Add to 30 parts of liquid, stir well, and the coating layer will be releasable, light resistant and antibacterial when coated The a, to prepare the functional control layer coating liquid C-1 capable of holding the surface resistance of the surface to ^{1.0 × 10 8 ~1.0 × 10 13} Ω / □ in the range of.

<Manufacture and image formation of laminate film 1 for electrophotography>
A transparent PET film (manufactured by Toray Industries Inc .: Lumirror 100T60: thickness 100 μm) is used as a base, and the functional control layer coating liquid C-1 is applied to one side of the base using a wire bar and dried at 120 ° C. for 30 seconds. Thus, a functional control layer having a film thickness of 1.5 μm was formed. Further, the image receiving layer coating liquid B-1 was applied to the other surface (untreated surface) of this substrate using a wire bar and dried at 120 ° C. for 30 seconds to form an image receiving layer having a thickness of 2 μm. Then, it was cut into A4 size (210 mm × 297 mm) to produce a laminate film 1.

  Next, a color copier DocuColor1255CP remodeling machine manufactured by Fuji Xerox Co., Ltd. (modified so that the surface temperature of the laminating film during fixing is in the range of 95 to 100 ° C.) 1) a laminate film 1-U in which nine color-sized mirror image images including a solid image are formed on one A4 size card-size image, and nine mirror image characters having only character information are similarly formed on a laminate film 1-U. D was produced.

<Production of information recording medium>
The image forming surface of the laminate film 1-U is overlaid on one side of the card core substrate sheet 1 and the image forming surface of the laminate film 1-D is overlaid on the other side so that the four corners of each film are aligned. Further, the both sides were overlapped by being sandwiched by a set of pressing plate materials having a specular surface made of a SUS steel plate.
The laminate (pressing plate material 1 / laminate film 1-U / card core substrate sheet 1 / laminate film 1-D / pressing plate material 1) subjected to the above positioning and superposition is moved up and down under atmospheric pressure. Lamination was performed by hot pressing for 45 seconds at a temperature of 115 ° C. and a pressure of 5 kgf / cm ² , and after cooling to room temperature, the pressing plate 1 was removed to obtain an information recording medium 1.

<Evaluation of card core substrate>
20 sheets of the card core base sheet 1 obtained as described above are stacked and allowed to stand for 24 hours in an environment of 40 ° C. and 90% RH, and the tack (adhesion) property of the 20 core base materials is examined for each of the storage properties. Evaluation 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 at least one of the 20 sheets in which the sheets were separated (separated) with a large force or that could not be separated occurred.

-Storageability evaluation-
<Performance evaluation of information recording media>
The information recording medium 1 is evaluated for image quality, laminate quality (residual air bubbles, dust resistance), laminating property (peeling strength), light resistance and embossing property according to the following criteria, respectively. 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 laminate film, and evaluating the accurate print reproducibility as follows.
A: A change rate of less than 3% was shown.
(Triangle | delta): What showed the change rate of less than 3-7%.
X: The rate of change was 7% or more.

-Evaluation of laminate quality (residual air bubbles)-
Regarding the laminate quality, regarding the information recording medium 1 after the lamination, the remaining of air bubbles between the laminate film 1-U and the core substrate 1 and between the laminate film 1-D and the core substrate 1 are visually checked as follows. It was evaluated with.
○: Residual bubbles cannot be confirmed.
Δ: Slightly residual bubbles can be confirmed.
X: Many or large bubbles can be confirmed.

-Evaluation of laminate quality (contamination of dust and dirt)-
Concerning the laminate quality, with respect to the information recording medium 1 after lamination, the dust contamination between the laminate film 1-U and the core substrate 1 and between the laminate film 1-D and the core substrate 1 is visually checked as follows. Evaluated by criteria.
○: Dust contamination cannot be confirmed.
Δ: Slight dust can be confirmed.
X: Many dusts can be confirmed.

-Evaluation of laminate properties (peel strength)-
Regarding the laminating property, with respect to the information recording medium 1 after lamination, the interface between the laminate film 1-U and the core substrate 1 and the laminate film 1-D and the core substrate 1 is peeled off with a cutter knife, and the portion is held. Evaluation was made according to the following criteria, depending on the situation when peeled by hand.
(Double-circle): It does not peel at all.
○: The laminate film is torn off immediately after peeling.
(Triangle | delta): Although the laminate film peels off, the image of the peeled surface is disordered and it seems that forgery is difficult.
X: The laminate film is easily peeled easily except the above.

-Light resistance evaluation-
In the light resistance evaluation, a laminate film 1 with a solid image printed side down was placed in a light resistance tester (Toyo Seiki Co., Ltd .: SUNTEST CPS +), and 760 W / mm with a Xe lamp in a 63 ° C. atmosphere. Irradiated for 100 hours at an intensity of m ² . Next, the image density of the solid image before and after the irradiation was measured, and the difference in image density was less than 0.1, ◯, 0.1 to 0.5, and 0.5 to 1.0. The following were evaluated as Δ, and those exceeding 1.0 as ×.

-Embossability evaluation-
The embossability evaluation is based on JIS X6302, and the information recording medium 1 cut into a card shape is embossed using an embossing machine (printed-tech international company: electric embosser E2) and then imprinted from the card surface. The height of the convex portion of the character (the height of the convex portion of the character measured from the surface of the card without the emboss to the highest point of the embossed character) was measured with a micrometer and evaluated according to the following criteria.
A: 0.46 to 0.48 mm
○: 0.40 to 0.46 mm
Δ: 0.36 to 0.40 mm
×: ~ 0.36mm
The above results are summarized in Table 1.

(Comparative Example 1)
The core base material sheet used in Example 1 without an adhesive layer was used as a card core base sheet (card core base sheet 2).
Evaluation of this card core substrate sheet 2 was carried out in the same manner as in Example 1, and an information recording medium 2 was obtained in the same manner as in Example 1 using this card core substrate sheet. In the evaluation of the obtained information recording medium 2, the adhesiveness is insufficient, the quality after lamination is poor, the laminate film 1-U and the card core substrate sheet 2, the laminate film 1-D and the card core. Many air bubbles remained between the base material sheets 2. These results are summarized in Table 1.

(Comparative Example 2)
Adhesion was carried out in the same manner as in Example 1 except that the cross-linked methacrylate copolymer fine particles, which were fine particles used in the adhesive layer coating solution A-1 for the card core substrate sheet of Example 1, were not used. The layer coating liquid A-2 was prepared, and using this, the core substrate sheet 3 for cards was produced in the same manner as in Example 1.
Evaluation of the card core substrate sheet 3 was performed in the same manner as in Example 1. However, the storage property was poor, and there was a portion where some sheets were tacked and could not be separated. Further, an information recording medium 3 was obtained in the same manner as in Example 1 by using the core base sheet 3 for card. In the evaluation of the information recording medium 3 obtained, the quality after lamination is poor, and there are many between the laminate film 1-U and the card core base sheet 3 and between the laminate film 1-D and the card core base sheet 3. Bubbles remained. These results are summarized in Table 1.

(Comparative Example 3)
Crosslinked methacrylic acid ester copolymer fine particles which are fine particles used in the adhesive layer coating solution A-1 for the card core substrate sheet of Example 1 having an average particle size of 40 μm (manufactured by Soken Chemical Co., Ltd .: MX4000) Except that the adhesive layer coating solution A-3 was prepared in the same manner as in Example 1 except that the adhesive layer coating solution A-3 was used. 4 was produced.
The card core substrate sheet 4 was evaluated in the same manner as in Example 1. However, in the evaluation of the information recording medium using the card core substrate sheet 4, after lamination, the image portion was discolored by fine particles. An image quality defect occurred. Further, an information recording medium 4 was obtained in the same manner as in Example 1 by using the core base sheet 4 for card. In the evaluation of the obtained information recording medium 4, slight bubbles remain in the vicinity of the fine particles between the laminate film 1-U and the card core substrate sheet 4 and between the laminate film 1-D and the card core substrate sheet 4. The part which was done was seen. These results are summarized in Table 1.

(Comparative Example 4)
A card core substrate sheet 5 was prepared in the same manner as in Example 1 except that a white PET film (Toray Industries, Inc .: Lumirror E20: thickness 250 μm) was used instead of the card core substrate sheet of Example 1. Produced.
Evaluation of the card core substrate sheet 5 is performed in the same manner as in Example 1, and two card core substrate sheets 5 are used in the same manner as in Example 1 to obtain an information recording medium 5. It was. In the evaluation of the obtained information recording medium 5, the adhesiveness was insufficient, and it was easily peeled off at the interface between the core base material of the card core sheet base material 5 and the adhesive layer. Further, the embossability was poor, and the height of the convex portion of the embossed letters was less than 0.36 mm. These results are summarized in Table 1.

(Comparative Example 5)
<Preparation of adhesive layer coating solution A-4>
Solution containing acrylic resin (manufactured by Soken Chemical Co., Ltd .: Thermolac M-45C, methyl ethyl ketone 55 wt% solution containing 45 wt% acrylic resin as solid content) 100 parts of crosslinked methacrylate copolymer as fine particles 50 parts of fine particles (manufactured by Soken Chemical Co., Ltd .: MX-2000, average particle size: 20 μm) and 50 parts of cyclohexanone as a solvent were added and mixed, and stirred sufficiently to prepare an adhesive layer coating solution A-4.

An adhesive layer is formed using the adhesive layer coating solution A-4 on the card core substrate sheet of Example 1, and the card core substrate sheet 6 having an adhesive layer of 15 μm is formed in the same manner as in Example 1. Produced.
Evaluation of the card core substrate sheet 6 was performed in the same manner as in Example 1, and the information recording medium 6 was obtained in the same manner as in Example 1 by using the card core substrate sheet 6. In the evaluation of the obtained information recording medium 6, the adhesiveness was insufficient. These results are summarized in Table 1.

(Comparative Example 6)
Crosslinked methacrylic acid ester copolymer fine particles, which are fine particles used in the adhesive layer coating solution A-1 for the card core substrate sheet of Example 1, have an average particle diameter of 3 μm (manufactured by Soken Chemical Co., Ltd .: MX300). Except that the adhesive layer coating solution A-6 was prepared in the same manner as in Example 1 except that the adhesive core coating sheet was used. 7 was produced.
The card core substrate sheet 7 was evaluated in the same manner as in Example 1. However, in the evaluation of the information recording medium using the card core substrate sheet 7, after lamination, the image portion was discolored due to fine particles. An image quality defect occurred. Further, an information recording medium 7 was obtained in the same manner as in Example 1 by using the core base sheet 7 for card. In the evaluation of the obtained information recording medium 7, many bubbles remain in the vicinity of the fine particles between the laminate film 1 -U and the card core substrate sheet 7 and between the laminate film 1 -D and the card core substrate sheet 7. did. These results are summarized in Table 1.

(Example 2)
<Preparation of adhesive layer coating liquid A-7>
50 parts of cyclohexanone, 0.1 part of a surfactant (manufactured by Nippon Oil & Fats Co., Ltd .: Elegan 264WAX) as a charge control agent, and fine particles of cross-linked methacrylate ester copolymer (manufactured by Soken Chemical Co., Ltd .: MX-3000, average particle diameter) And 30 parts by weight of polyester resin (Toyobo Co., Ltd .: Byron 300) containing 30% by weight of polyester resin as a solid content in a 50% by weight methyl ethyl ketone / 50% by weight toluene solution. 100 parts of the solution was added and sufficiently stirred to prepare an adhesive layer coating solution A-7.

<Preparation of core substrate for card>
The adhesive layer coating solution A-7 was applied to a B4 size white vinyl chloride sheet (manufactured by Taihei Chemical Products Co., Ltd .: Ebilon 8520, total thickness: 500 μm) using an applicator in the same manner as in Example 1. An adhesive layer having a thickness of 25 μm was formed on this, and this was cut into an A4 size (210 mm × 297 mm) to produce a card core substrate sheet 5.

<Preparation of Laminate Film 2 for Electrophotography>
(Preparation of image-receiving layer coating solution B-2)
10 parts of polyester resin (manufactured by Soken Chemical Co., Ltd .: Foret FF-4M, solid content 30% by mass in methyl ethyl ketone solution), cross-linked methacrylate copolymer fine particles (manufactured by Soken Chemical Co., Ltd .: MX-300, volume average) as a matting agent Particle size: 3 μm) 0.3 part, surfactant (manufactured by NOF Corporation: ELEGAN 264WAX) 0.4 part, 2- (2-hydroxy-5-methylphenyl) -2H-benzotriazole (Sumitomo) as UV absorber Chemical Co., Ltd .: Sumisorb 200) 0.3 parts, and antibacterial glass fine particles (Nippon Sheet Glass Co., Ltd .: Amoclin P-05, average particle size 5 μm) 0.05 parts as a mixed solvent of toluene 40 parts and methyl ethyl ketone 4 parts. Add to the solution and stir well to prepare coating solution B-2 that controls image-receiving layer, light resistance, chargeability and antibacterial functionality did.

<Manufacture and image formation of laminate film for electrophotography>
Film (made by Teijin DuPont Films, Inc.) in which a layer (thickness of about 16 μm) made of PETG resin in which a core is PET and ethylene glycol, terephthalic acid and 1,4-cyclohexanedimethanol components are copolymerized on both sides is formed The image-receiving layer coating liquid B-2 was applied to one side of the melnex 342 (total thickness: 102 μm) using a wire bar and dried at 70 ° C. for 60 seconds to form an image-receiving layer having a thickness of 0.5 μm. . Further, the image receiving layer coating solution B-2 was similarly applied to the other surface (untreated surface) of this substrate using a wire bar, dried at 70 ° C. for 60 seconds, and a film thickness of 0.5 μm. An image receiving layer and functionality control layer was formed. The film thus obtained was cut into A4 size to produce a laminate film 2.

  Next, a color copier DocuColor1255CP remodeling machine manufactured by Fuji Xerox Co., Ltd. (modified so that the surface temperature of the laminating film during fixing is in the range of 95 to 100 ° C. is applied to the surface of the image receiving layer of the laminate film 2. A laminate film 2-U in which nine color-sized mirror image images including a solid image are formed on one A4 size card-size image, and nine mirror-image characters only for character information are formed in the same manner. D was produced.

<Production of information recording medium>
In the same manner as in Example 1, the image forming surface of the laminate film 2-U is placed on one side of the card core substrate sheet 5 and the image forming surface of the laminate film 2-D is placed on the other side. The two layers were overlapped with each other, and both sides thereof were overlapped by being sandwiched by a set of pressing plate materials having a specular surface made of a SUS steel plate.
The laminate (pressing plate material 1 / laminate film 2-U / card core substrate sheet 4 / laminate film 2-D / pressing plate material 1) subjected to the above positioning and superposition is Lamination was performed by hot pressing for 45 seconds at a temperature of 115 ° C. and a pressure of 5 kgf / cm ² at a temperature of the pressing plate material, and after cooling to room temperature, the pressing plate material 1 was removed to obtain an information recording medium 5.

<Evaluation of card core substrate and information recording medium>
Evaluation of the card core substrate sheet 5 and the information recording medium 5 were evaluated in the same manner as in Example 1. The evaluation results are summarized in Table 1.

(Example 3)
Example 2 except that a polyester resin solution (byron 300 manufactured by Toyobo Co., Ltd .: Byron 300) was used instead of the polyester resin solution (byron 300 manufactured by Toyobo Co., Ltd.). The adhesive layer coating solution A-5 was prepared in the same manner as in Example 2, and the card core substrate sheet 6 was prepared in the same manner as in Example 2 and information recording was performed in the same manner as in Example 2 using this. Medium 6 was obtained.

<Evaluation of card core substrate and information recording medium>
Evaluation of the card core substrate sheet 6 and the information recording medium 6 were evaluated in the same manner as in Example 1. The evaluation results are summarized in Table 1.

Example 4
Example 2 except that a polyester resin (Toyobo Co., Ltd .: Byron GA6400) was used in place of the polyester resin (Toyobo Co., Ltd .: Byron 300) used for the adhesive layer of the card core substrate sheet of Example 2. In the same manner, the adhesive layer coating solution A-6 was prepared. Hereinafter, the card core substrate sheet 7 was prepared in the same manner as in Example 2, and the information recording medium was used in the same manner as in Example 2 by using this. 7 was obtained.

<Evaluation of card core substrate and information recording medium>
Evaluation of the card core substrate sheet 7 and the information recording medium 7 were evaluated in the same manner as in Example 1. The evaluation results are summarized in Table 1.

(Example 5)
Polyester resin used for the adhesive layer of the core substrate sheet for card of Example 2 (Toyobo Co., Ltd .: Byron 300, a solution containing polyester resin instead of Hitachi Chemical Co., Ltd .: ESBEL 9940B, methyl ethyl ketone 20% by weight / An adhesive layer coating solution A-7 was prepared in the same manner as in Example 2 except that 80 parts by weight of a toluene resin contained 40% by weight of a polyester resin as a solid content). A card core substrate sheet 8 was produced in the same manner as in Example 2, and an information recording medium 8 was obtained in the same manner as in Example 2 by using this.

<Evaluation of card core substrate and information recording medium>
Evaluation of the card core substrate sheet 8 and the information recording medium 8 were evaluated in the same manner as in Example 1. The evaluation results are summarized in Table 1.

(Examples 6 to 10)
As a card core substrate sheet, a vinyl chloride film inlet sheet in which nine IC chips and antennas are formed in an A4 size is laminated with a vinyl chloride sheet with a thickness of about 240 μm on both sides and a total thickness of 510 μm. Card core base materials 9 to 13 were produced on the front and back sides of the material sheet in the same manner as in Example 2 using the adhesive layer coating liquids used in Examples 1 to 5. In addition, information recording media 9 to 13 were obtained in the same manner as in Example 2 using these card core base materials 9 to 13.

(Example 11)
<Preparation of adhesive layer coating solution A-8>
Crosslinked methacrylic acid ester copolymer fine particles, which are fine particles used in the adhesive layer coating solution A-7 for the card core substrate sheet of Example 2, have an average particle diameter of 5 μm (manufactured by Soken Chemical Co., Ltd .: MX500). Except that the adhesive layer coating solution A-8 was prepared in the same manner as in Example 2 except that the thickness of the adhesive layer in Example 2 was changed to 4 μm. A material sheet 14 was produced. Also, using this, the information recording medium 14 was obtained in the same manner as in Example 2, and the same evaluation as in Example 1 was performed. The results are summarized in Table 1.

<Evaluation of card core substrate and information recording medium>
Evaluation of the card core base sheets 9 to 14 and information recording media 9 to 14 were evaluated in the same manner as in Example 1. The evaluation results are summarized in Table 1.

It is a schematic cross section which shows an example of the core sheet of this invention. It is a schematic cross section which shows an example of the information recording medium of this invention.

Explanation of symbols

10 (first) adhesive layer 20 core substrate 30 second adhesive layer 100 (first) laminate film 200, 200 ′ core sheet 300 second laminate film

Claims (3)

In a core substrate sheet for a card having a core substrate containing a polyvinyl chloride resin as a main component and an adhesive layer provided on at least one side of the core substrate,
The adhesive layer contains a resin component containing at least a polyester resin and fine particles having an average particle diameter of 5 μm or more and 35 μm or less, and a mass ratio of the fine particles to the resin component is 0.5 parts of the fine particles with respect to 1 part of the resin component. the core substrate sheet for card according to claim to 2 parts der Rukoto. The card core according to claim 1, further comprising: an image recording body including a substrate and an image receiving layer provided on the substrate, wherein image information is recorded and formed on the image receiving layer using an electrophotographic method; Including a base sheet,
An information recording medium, wherein any one surface of the image recording body and a surface on which the adhesive layer of the card core base sheet is provided are laminated.   The information recording medium according to claim 2 is manufactured through a process of laminating one of the surfaces of the image recording body and the surface on the side provided with the adhesive layer of the card core base sheet by thermocompression bonding. A method for manufacturing an information recording medium.

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