JP2004037564A - Forgery preventive sheet - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a forgery preventive sheet having high forgery preventing effects and high tampering preventing effects constituted so that the size and the shape of masking information can be freely changed, it is impossible or difficult to see the printed masking information(image and letter, etc.) with naked eyes, the design property is not damaged, and the images and the letters can be easily read and seen when the latent images are irradiated with ultraviolet ray emitted from a UV lamp. <P>SOLUTION: As to the forgery preventive sheet, the masking information formed with undistinguishable white toner homochromatic with the white sheet is printed on the prescribed part of the white sheet surface, the white toner contains fluorescent material. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a sheet for preventing forgery, and more particularly, to a sheet for receipts, securities, various cards, and the like having a high anti-counterfeiting effect and a high falsification preventing effect of concealment (confidential) information (stealth information). is there.
[0002]
[Prior art]
Conventionally, a colorless fluorescent ink (hidden ink) is used under normal light, which contains a fluorescent material that emits light by ultraviolet rays. For example, images and characters are printed using this fluorescent ink in a hidden information entry column of a card or the like. Then, the printed images and characters are not visible to the naked eye, but when this latent image is irradiated with ultraviolet light by a UV lamp (commonly called black light), the fluorescent material emits light and the images and characters are read or viewed. Possible anti-counterfeit sheets are known.
[0003]
[Problems to be solved by the invention]
However, conventionally, concealed (confidential) information such as images and characters are formed by hand using fluorescent ink on the sheet surface of a card or the like, or the fluorescent ink is applied to the sheet surface of a card or the like and then dried as necessary. The concealment (confidential) information such as images and characters is printed and formed, so that the efficiency is low in the case of handwriting, while the productivity is excellent in the printing method, There is a problem that the degree of freedom of the size and shape is small, and the size and shape are limited to those having a predetermined size and shape.
SUMMARY OF THE INVENTION In view of the conventional problems, it is an object of the present invention to be able to freely change the size and shape of concealed (confidential) information, and to have a high anti-counterfeiting and tampering prevention effect. An object of the present invention is to provide an inexpensive forgery prevention sheet applicable to an IC card, a rewritable card, and the like.
[0004]
[Means for Solving the Problems]
That is, in order to solve the above-mentioned problem, the forgery prevention sheet according to claim 1 of the present invention is a cover sheet that uses a white toner of the same color system that is difficult to distinguish from the white sheet in a predetermined portion of the white sheet surface. Wherein the white toner contains a fluorescent material.
[0005]
The anti-counterfeit sheet of the present invention contains a white pigment of the same color and a binder resin component, which are difficult to distinguish from the white sheet, as a main component in a predetermined portion of a white sheet surface such as paper or synthetic paper, and a fluorescent material. Concealment information is printed by an electrophotographic method using a white toner containing Since the concealment information is printed by the electrophotographic method, the size and shape of the concealment information can be freely changed, and the printed images and characters use the same color white toner that is difficult to distinguish from the white sheet. Because it is printed on the white sheet surface, it is invisible or difficult to see, so the design is not impaired. When this latent image is irradiated with ultraviolet light using a UV lamp, the fluorescent material emits light and images, characters, etc. Can be easily read and viewed, so that the forgery and tampering prevention effects are high.
[0006]
The forgery prevention sheet according to claim 2 of the present invention is the forgery prevention sheet according to claim 1, wherein the fluorescent material is a white fluorescent material of the same color system that is difficult to distinguish from the white sheet. I do.
[0007]
If a white fluorescent material of the same color, which is difficult to distinguish from the white sheet, is used as the fluorescent material, it becomes more unrecognizable or difficult to recognize, and the forgery and tampering prevention effects are improved.
[0008]
The forgery prevention sheet according to claim 3 of the present invention is the forgery prevention sheet according to claim 1 or 2, wherein the white toner is provided on at least a portion of the sheet surface where the hiding information is formed by the white toner. A toner receiving layer containing the same kind of binder resin component as the binder resin component is formed, and concealment information using white toner is printed on a predetermined portion of the toner receiving layer.
[0009]
Since the toner receiving layer formed on the sheet surface contains the same kind of binder resin component as the binder resin component of the white toner, the fixing property of the white toner to the toner receiving layer is improved, and the image and the character are suitably formed. Can be formed.
[0010]
The sheet according to claim 4 of the present invention contains at least an image forming component of the same type as the image forming component of the white toner on a sheet surface of a portion where an image or a character is formed by the white toner. Characterized in that a toner receiving layer is formed.
[0011]
Since the toner receiving layer formed on the sheet surface contains an image forming component (white pigment) of the same type as the image forming component (white pigment) of the white toner, images and characters formed on the toner receiving layer surface are The visibility becomes more difficult together with the fixing property, and the forgery prevention effect is further enhanced.
[0012]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail.
FIG. 1 is an explanatory view showing an example of the forgery prevention sheet of the present invention.
The anti-counterfeit sheet 1 according to the present invention includes a white sheet (receipt, securities, various cards, etc.) such as paper or synthetic paper, and a white pigment of the same color that is difficult to distinguish from the white sheet 2 The concealment information 3 is printed by an electrophotographic method using a white toner containing a white sheet 2 and a binder resin component as a main component, and a white fluorescent material of the same color that is difficult to distinguish from the white sheet 2.
Since the concealment information 3 is printed by an electrophotographic method, the size and shape of the concealment information 3 can be freely changed, and the printed images and characters 3 of the same color system that are difficult to distinguish from the white sheet 2 Since the white toner is printed on the surface of the white sheet 2 using the white toner, it is invisible or difficult to see. Therefore, even if the concealment information 3 is printed, the design property is not impaired, and the forgery and tampering prevention effects are high. . When the latent image 3 is irradiated with ultraviolet light by a UV lamp, a white fluorescent material emits light so that images and characters 3 can be easily read and viewed.
[0013]
FIG. 2 is a sectional explanatory view showing a section of another example of the forgery prevention sheet of the present invention.
The forgery prevention sheet (card) 1A of the present invention is obtained by laminating an unillustrated oversheet material such as a transparent vinyl chloride resin on a thermoplastic resin such as an opaque vinyl chloride resin or a polyethylene terephthalate resin called a center core material (not shown). A white toner receiving layer 4 of the same color, which is difficult to distinguish from the white card substrate 2A, is formed on a predetermined portion of the upper surface of the standard size white sheet (card substrate) 2A. A predetermined portion of the surface of the toner receiving layer 4 contains, as main components, a white pigment of the same color and a binder resin component which are difficult to distinguish from the white card substrate 2A, and a white of the same color which is difficult to distinguish from the white card substrate 2A. The concealment information 3 is printed by an electrophotographic method using a white toner containing the above fluorescent material.
Since the concealment information 3 is printed by the electrophotographic method, the size and shape of the concealment information 3 can be freely changed, and the printed image / character 3 is difficult to distinguish from the white card base material 2A. Since it is printed on the surface of the white toner receiving layer 4 using the same color white toner, it is invisible or difficult to see. Therefore, even if the concealment information 3 is printed, the design property is not impaired and the forgery is prevented. High effect and tampering prevention effect. When the latent image 3 is irradiated with ultraviolet light by a UV lamp, a white fluorescent material emits light so that images and characters 3 can be easily read and viewed. The concealment information 3 improves the adhesiveness with the white toner receiving layer 4, so that the concealment information 3 does not peel off even if it is rubbed, for example.
Next, electrophotographic printing will be described.
Electrophotographic printing generally uses a photoconductive insulator (such as a photo-condrum) to apply a uniform electrostatic charge to the photoconductive insulator by corona discharge or the like. An electrostatic latent image is formed by irradiating a light image on the insulator, then the latent image is developed and visualized using toner fine powder, and the toner image is transferred to paper or the like, and then pressurized, heated, and solvent A method of fixing a toner image on a recording medium such as paper by means of evaporation, irradiation of light or the like to obtain a copy (for example, US Pat. No. 2,297,691), or a method of forming a light image on a photoconductive insulator. There is a method of irradiation.
Conventionally, as these toners, particles obtained by dispersing a color pigment or color dye such as carbon black as an image forming component in a binder resin component made of a natural or synthetic polymer and finely pulverized to about 5 to 20 μm are used. Have been. Such a toner is usually used alone or mixed with a carrier substance (carrier) such as iron powder or glass beads.
[0014]
Examples of the binder resin component of the white toner used in the present invention include natural and / or synthetic polymers conventionally used as the binder resin component of the toner.
Specific examples of the binder resin component used in the present invention include, for example, polyester, polyethylene, polystyrene and styrene copolymer (for example, styrene-acryl resin, styrene-butadiene resin, etc.), acrylate and methacrylate resins, polyvinyl chloride resin, acetic acid Vinyl resin, vinyl chloride / vinyl acetate copolymer resin, vinyl chloride / vinyl acetate / maleic acid copolymer resin, vinyl butyral resin, polyvinyl alcohol resin, polyurethane resin, polyimide resin, polyamide resin, polyether resin, epoxy resin, etc. Can be mentioned. These may be used in combination of two or more.
[0015]
Among these, a transparent thermoplastic binder resin component can be preferably used in the present invention.
In particular, when the binder resin component of the white toner has transparency that allows the white pigment, which is the image forming component of the toner, to be seen through, the chromaticity of the concealment information 3 printed by the electrophotographic method is improved, and the concealment information 3 becomes white. The opaque information 3 becomes invisible or more difficult to see with the naked eye because it becomes a white of the same color system that is difficult to discriminate from the sheet, and thus can be used more preferably in the present invention.
[0016]
The white pigment of the white toner used in the present invention may be of the same color that is difficult to distinguish from the white sheet used in the present invention, and natural products and / or synthetic products can be used. Specifically, for example, titanium dioxide (anatase or rutile), zinc oxide, zinc sulfide, lithopone, lead pigment (lead carbonate, basic lead sulfate, basic lead silicate, basic lead silicosulfate, dibasic suboxide) Lead phosphate, etc.), antimony oxide, zirconium oxide, zircon, kaolin, clay, calcium carbonate, barium sulfate, silicates (such as talc obtained from steatite, asbestin, etc.), mica, hydrated alumina, pumice, asbestos, Examples thereof include calcium sulfate, sodium aluminosilicate, and sodium potassium aluminosilicate. These may be used in combination of two or more.
The content and particle size of the white pigment in the white toner are not particularly limited, so that the white sheet used in the present invention has the same color that is difficult to distinguish from the white sheet, and the white sheet and the smoothness and gloss are not uncomfortable. It is preferable to design it.
[0017]
The fluorescent material of the white toner used in the present invention may be an organic fluorescent material, an inorganic fluorescent material, or a mixture of two or more thereof, and a known fluorescent material can be used.
Specific examples of the organic fluorescent material include fluorescent dyes such as donor-acceptor type, cyanine type, acyclic or cyclic polyene type, and stilbene, 4,4′-diaminostilbene, biphenyl, Examples thereof include fluorescent whitening agents such as derivatives of a 5-membered heterocyclic ring (triazole, oxazole, imidazole, etc.) and derivatives of a 6-membered heterocyclic ring (coumarin, naphthalimide, s-triazine, etc.) or a mixture of two or more thereof.
[0018]
As the inorganic fluorescent material, specifically, oxides, sulfides, silicates, tungstates, oxylates of metals such as zinc, cadmium, calcium, barium, magnesium, aluminum, yttrium, etc. having high purity And the like, to which trace amounts of activators and fluxes such as manganese, silver, copper, lead, and europium are added, and fired at a high temperature, or a mixture of two or more of these. .
[0019]
In the present invention, a fluorescent pigment obtained by blending a fluorescent dye with a synthetic resin having transparency, such as an acrylic resin, a vinyl chloride resin, or an alkyd resin, can also be used.
Among these fluorescent materials, the white color fluorescent material of the same color that is difficult to distinguish from the white sheet makes the concealment information 3 invisible or more difficult to see with the naked eye, and improves the forgery and tampering prevention effects. It can be preferably used in the invention.
[0020]
The blending amount of the fluorescent material in the white toner used in the present invention is not particularly limited, but preferably 0.1 to 5 parts by mass, more preferably 0.1 to 5 parts by mass of the fluorescent material with respect to 100 parts by mass of the white toner. It is desirable to mix 2 to 4 parts by mass. If the amount is less than 0.1 part by mass, the amount of fluorescent light is so small that light emission cannot be confirmed. If the amount exceeds 5 parts by mass, the amount of fluorescent light does not increase, which is uneconomical.
[0021]
The white toner used in the present invention may further contain a small amount of commonly used additive components such as a charge controlling agent, a tackifier, a viscosity modifier, an antioxidant, an ultraviolet absorber, a stabilizer, and a lubricant, if necessary. It can be contained.
[0022]
The kind and molecular weight of the binder resin component of the white toner used in the present invention, the content of the binder resin component and the white pigment in the white toner, and the like are adjusted according to the characteristics, design, and electrophotographic method of the forgery prevention sheet of the present invention. The adjustment is optimally performed as described above, and is not particularly limited. However, the content of the binder resin component in the white toner is usually 50 to 95% by mass.
[0023]
The white toner used in the present invention can be produced by a conventionally known method. That is, a binder resin component, a white pigment, a fluorescent material and, if necessary, a charge control agent, for example, are kneaded and uniformly dispersed by, for example, a pressure kneader, a roll mill, an extruder, and finely pulverized by, for example, a jet mill, The desired toner can be obtained by classification using a classifier such as an air classifier. The particle size of the white toner used in the present invention may be the same as the particle size of a conventionally known toner, and is specifically about 3 to 20 μm, and preferably about 10 μm.
[0024]
Examples of the white sheet material used in the present invention include woven fabrics, nonwoven fabrics, mats, and papers made of inorganic or organic fibers such as glass fiber, alumina fiber, polyester fiber, and polyamide fiber (for example, high-quality paper, medium-quality paper, and synthetic paper). Paper, various recycled paper, art paper, coated paper, mirror coated paper, condenser paper, paraffin paper, other papers, and paper with an overcoat layer (protective layer), or a combination of these, or Composite sheets, polyamide-based resin sheets, polyester-based resin sheets, polyolefin-based resin sheets, polyimide-based resin sheets, ethylene-vinyl alcohol copolymer sheets, polyvinyl alcohol-based resin sheets, and polychlorinated resin sheets formed by impregnating these with resin varnish. Vinyl resin sheet, polyvinylidene chloride resin sheet, Plastic sheets such as styrene resin sheet, polycarbonate resin sheet, acrylonitrile butadiene styrene copolymer resin sheet, polyethersulfone resin sheet, or corona discharge treatment, plasma treatment, ultraviolet irradiation treatment, electron beam irradiation treatment, frame A known surface treatment such as a surface treatment such as a plasma treatment and an ozone treatment can be used.
[0025]
The method and means for forming the white toner receiving layer on the white sheet surface are not particularly limited. However, the method of forming a white toner-receiving layer by applying a white pigment and / or a coating liquid of an ultraviolet curable paint containing a white pigment to a white sheet surface by applying the coating solution to the white sheet surface is as follows. It is easy to apply. After coating on a white sheet surface by a known method, it can be dried if necessary, and can easily form a white toner receiving layer by irradiating ultraviolet rays, and further improves the fixability of the white toner. Because it can be used, it can be preferably used.
When a white toner receiving layer is formed using a white pigment of a white toner and / or a coating liquid of an ultraviolet curable paint containing the same kind of white pigment and / or white pigment as the white pigment, a white sheet and a white sheet can be obtained. This is preferable because it becomes more difficult to identify the white toner receiving layer.
[0026]
The UV-curable paint for forming the white toner receiving layer is based on a conventionally known UV-curable paint, which applies a curing means by forming a resin by a polymerization reaction of a binder resin component generated by ultraviolet irradiation, and Contains polymerizable oligomers (prepolymers) and / or photopolymerizable monomers and photopolymerization initiators as essential components, and further includes various additives such as antistatic agents, photopolymerization accelerators, stabilizers, and waxes as necessary. be able to.
[0027]
Further, when the ultraviolet curable paint contains a binder resin component of the same kind as the binder resin component constituting the white toner used in the present invention, the phase melting property of the white toner and the white toner receiving layer 4 during heating and melting. Is very high, and the fixability of the white toner is remarkably improved. The content form of the binder resin component contained in the ultraviolet-curable paint may be in the form of a photopolymerizable oligomer or monomer that forms the binder resin component by a photopolymerization reaction, or the binder resin component constituting the white toner may be fine particles. And then disperse it in the paint or make them coexist.
Particularly preferred are photopolymerizable oligomers or photopolymerizable monomers which form a styrene acrylic thermoplastic resin component or an epoxy acrylic thermoplastic resin component by polymerization, or fine particles of this resin component. When the white toner receiving layer 4 containing these resin components is provided, the fixability of the white toner is remarkably superior to those of other resins.
[0028]
If the content of the binder resin component in the UV-curable coating composition is less than 50% by mass, a predetermined white toner fixing property cannot be obtained, while if it exceeds 95% by mass, the suitability as a printing ink is impaired. The content is preferably 50 to 95% by mass, more preferably 60 to 90% by mass, and particularly preferably 70 to 80% by mass.
The content of the white pigment and / or the content of the white pigment in the ultraviolet-curable paint is not particularly limited, but it is important to adjust the white toner receiving layer so that the white toner receiving layer is difficult to distinguish from the white sheet.
[0029]
Further, when the amount of the photopolymerizable monomer is large, the hardness of the white toner receiving layer 4 becomes too high, so that the white toner receiving layer 4 is fixed on the sheet surface or peeled off by rubbing. is there. Furthermore, when fine particles of the binder resin component are contained, if the content is high, the suitability as a printing ink is reduced. Therefore, the content is preferably 20% by mass or less.
[0030]
The photopolymerization initiator may be a conventionally known radical polymerization type, and examples thereof include benzoethers, acetophenones, ketals, and thioxanthones. Specifically, 4,4 bisdimethylaminobenzophenone, -Hydroxycyclohexylphenyl ketone, 2,2-dimethoxy-2-phenylacetophenone, 2-hydroxy-2-methyl-1-phenylpropan-1-one, and methyl benzoylbenzoate.
[0031]
The description of the above embodiments is for describing the present invention, and does not limit the invention described in the claims or reduce the scope thereof. The configuration of each part of the present invention is not limited to the above embodiment, and various modifications can be made within the technical scope described in the claims.
[0032]
【The invention's effect】
The anti-counterfeit sheet according to the first aspect of the present invention mainly includes a predetermined portion of a white sheet surface such as a color sheet (colored paper) and a white pigment of the same color and a binder resin component which are difficult to distinguish from the white sheet. The concealment information is printed by electrophotography using a white toner that contains a fluorescent material and contains as a component, so that the size and shape of the concealment information can be freely changed, and furthermore, the printed images and characters are printed. Are printed on the white sheet surface using the same color white toner that is difficult to distinguish from the white sheet, so they are invisible or difficult to see, and thus the design is not impaired. Irradiation with ultraviolet light causes the fluorescent material to emit light, so that images and characters can be easily read and viewed, which has a remarkable effect that the effect of preventing forgery and tampering is high.
[0033]
The forgery prevention sheet according to claim 2 of the present invention is the forgery prevention sheet according to claim 1, wherein the fluorescent material is a white fluorescent material of the same color system that is difficult to distinguish from the white sheet. In addition to the same effect as the forgery prevention sheet described in 1, the concealment information becomes more invisible or difficult to see, and further has a further remarkable effect that the forgery and tampering prevention effects are improved.
[0034]
The forgery prevention sheet according to claim 3 of the present invention is the forgery prevention sheet according to claim 1 or 2, wherein the white toner is provided on at least a portion of the sheet surface where the hiding information is formed by the white toner. A toner receiving layer containing a binder resin component of the same type as the binder resin component is formed, and opaque information using white toner is printed on a predetermined portion of the toner receiving layer. The fixing property to the layer is enhanced, and even if it is rubbed, the concealment information is not peeled off, and an even more remarkable effect that images and characters can be suitably formed can be obtained.
[0035]
The sheet according to claim 4 of the present invention contains at least an image forming component of the same type as the image forming component of the white toner on a sheet surface of a portion where an image or a character is formed by the white toner. Since the toner receiving layer is formed, the image and the characters formed on the surface of the toner receiving layer have a more remarkable effect that the visibility becomes more difficult as well as the fixability, and the effect of preventing forgery is further enhanced.
[Brief description of the drawings]
FIG. 1 is an explanatory view showing an example of a forgery prevention sheet of the present invention.
FIG. 2 is an explanatory sectional view showing a section of another example of the forgery prevention sheet of the present invention.
[Explanation of symbols]
1 Forgery prevention sheet 1A Forgery prevention sheet (card)
2 White sheet 2A White sheet (card base material)
3 Letter 4 White toner receiving layer

Claims (4)

A sheet in which concealment information using a white toner of the same color that is difficult to distinguish from the white sheet is printed on a predetermined portion of the white sheet surface, wherein the white toner contains a fluorescent material. Features a forgery prevention sheet. 2. The sheet according to claim 1, wherein the fluorescent material is a white fluorescent material of the same color that is difficult to distinguish from the white sheet. At least a toner receiving layer containing a binder resin component of the same type as the binder resin component of the white toner is formed on a sheet surface of a portion where the concealment information by the white toner is formed. 3. The sheet according to claim 1, wherein concealment information using white toner is printed on a predetermined portion. At least a toner receiving layer containing an image forming component of the same type as the image forming component of the white toner is formed on a sheet surface of a portion where the concealment information by the white toner is formed. The sheet according to claim 3, wherein

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