JP2000129596A - Paper for preventing falsification - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a paper for preventing falsification, capable of visually checking the traces of falsification even if the falsification is attempted. SOLUTION: A water-insoluble and organic solvent-soluble fluorescent dye particle is added to a paper. The dye particle can not be visually checked under an ordinary illumination. The trace of falsification can be detected by the appearance of a specific hue at a part, in which falsification is attempted by an organic solvent, by irradiation with an ultraviolet light. The paper has an effect of making a person trying falsification give up the falsification.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to anti-counterfeit paper. More specifically, the present invention relates to anti-counterfeit paper in which traces can be visually recognized even if an attempt is made to falsify using an organic solvent.

[0002]

2. Description of the Related Art Banknotes, gift certificates, passports, stock certificates, checks, and the like are provided with various counterfeiting prevention measures so as not to be illegally forged. One of the anti-counterfeit measures is that the anti-counterfeit means cannot be visually recognized under natural light or ordinary lighting, but can be visually recognized by using a special device. Based on this idea, for example,
There have been proposed anti-counterfeit papers and anti-counterfeit prints using fluorescent dyes and fluorescent pigments that emit various colors by irradiation with ultraviolet rays, and materials used for these.

For example, anti-counterfeit prints in which characters or patterns are printed on the surface of paper with an ink containing a fluorescent pigment and a vehicle as main components as disclosed in Japanese Patent Application No. 1-68299 and others have been widely known. I have.

Further, Japanese Patent Application Laid-Open No. 58-54099 and Japanese Patent Publication No. 56-16328 are characterized in that a fiber is dyed and mixed with a fiber which has not been subjected to fluorescent dyeing. A method for producing forgery prevention paper has been proposed. JP-A-6-128807 and the like have proposed a method for producing a fluorescent coloring fiber in which an oxide fluorescent pigment is added during spinning.

The applicant of the present invention has disclosed in Japanese Patent Laid-Open No. 7-16661.
In No. 98, anti-counterfeit paper is proposed, which emits a fluorescent color when irradiated with ultraviolet light and has strips that have the ability to adhere to the base paper in the paper making process. Was.

On the other hand, even if tampering is performed using various chemicals,
In the past, various anti-counterfeit papers that can be easily determined to have been tampered have been proposed. For example, Japanese Patent No. 78774 and Japanese Patent No. 77962 propose a security paper in which manganese ferrocyanide is included in the paper, and when the characters described in the money amount column are erased by ink erasing, the paper turns brown. is there.

Further, Japanese Patent No. 136286 proposes a tamper-proofing paper in which a substance which changes color by an oxidizing agent, a tannin and a penetrant are processed into paper, and if the tamper is attempted by erasing the ink, a color which does not disappear is obtained. There is.

Further, Japanese Patent No. 1414483 proposes a safety paper which contains a reactive fluorescent dye based on a water-soluble metal salt of pyrene sulfonic acid in a paper, and exhibits a fluorescent color when the ink is erased or falsified with a weak alkali. There is.

Japanese Patent Application Laid-Open No. 57-21660 discloses that even if a microcapsule containing a solvent for an erasable ink is contained on the surface of a paper and attempted to be tampered with an eraser or the like, the capsule is broken by the pressure and the ink is broken. There is a proposal of a forgery prevention paper in which paper is eluted and permeated into a paper layer so that traces of tampering remain.

[0010] Also, JP-A-63-182496 discloses that
A color-developing layer containing a leuco dye, a phenolic substance and a binder as main components is provided on the paper surface, and even if an attempt is made to falsify with an organic solvent, the leuco dye and the phenolic substance are eluted by the permeation of the solvent, and the two react chemically to form a color. There is a proposal for falsification prevention paper.

[0011]

As described above, various forgery prevention means are known. However, those who try to forgery are not endless, and there is a demand for forgery prevention paper which always employs new forgery prevention means. is the current situation. The present invention has been made in such a background, and the present invention uses a water-insoluble and organic solvent-soluble fluorescent dye, and has a tamper-proof configuration completely different from those of these conventionally proposed anti-counterfeit papers. It is an object of the present invention to develop a new type of anti-counterfeit paper in which traces can be visually recognized.

[0012]

The gist of the present invention is a forgery prevention paper characterized in that the paper contains fluorescent dye particles which are insoluble in water and soluble in an organic solvent. As used in the present invention, the “ordinary light source” means a light source of natural light, an incandescent lamp, or a fluorescent lamp, and the “fluorescent dye” means a dye that emits a specific light in a visible light region by irradiation with ultraviolet rays. However, a fluorescent whitening agent intended for a whitening effect is also included in this category.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The fluorescent dye particles used in the present invention must be water-insoluble and organic solvent-soluble. If the dye is water-soluble, the dye particles are dissolved in water during the production of paper, and the object of the present invention cannot be achieved. Further, if the solvent is not soluble in the organic solvent, the trace of the tampering cannot be visually recognized when the tampering is attempted with the solvent.

As the fluorescent dye particles used in the present invention, any one can be used as long as it is water-insoluble and soluble in an organic solvent. However, it has been developed for coumarin-based, oxazole-based and pyrazoline-based synthetic resins. Fluorescent dyes for fluorescent whitening are mentioned as an example. These fluorescent dyes are colorless under the ordinary light source when they are filled with fluorescent dye particles themselves in a container, but emit blue-white light when irradiated with ultraviolet light. This type of fluorescent dye is sold by dye manufacturers, but one example is (trade name "Mikawhite ATN conc.", Manufactured by Nippon Kayaku Co., Ltd .: colorless and ultraviolet light under a normal light source. Irradiates with reddish white), (trade name "Leucop"
her EF 2N ", manufactured by Clariant Co., Ltd .: colorless under a normal light source, slightly bluish white when irradiated with ultraviolet light, (trade name" TBO ", manufactured by Sumitomo Seika Co., Ltd .: normal) Colorless under a light source, and bluish white when irradiated with ultraviolet light).

In the present invention, it is also possible to use aminoketone-based dyes which emit fluorescent light in various hues when irradiated with ultraviolet light, and have a chromatic color under the ordinary light source when the fluorescent dye particles themselves are filled in a container. . This type of fluorescent dye is also sold by dye manufacturers, but one example is (trade name "Yellowfluor G", Sumitomo Chemical Co., Ltd.)
Production: yellow under a normal light source, yellow when irradiated with ultraviolet rays, (trade name “Kayaset Flavine”
FN ", manufactured by Nippon Kayaku Co., Ltd.): Yellow under a normal light source, and yellow when irradiated with ultraviolet rays.
set Flavine FG ", manufactured by Nippon Kayaku Co., Ltd .: yellow under a normal light source, and yellow by irradiation with ultraviolet rays. (trade name" Kayaset Yellow SF "
-G ", manufactured by Nippon Kayaku Co., Ltd.): yellow under a normal light source, and yellow when irradiated with ultraviolet rays.
set Orange SF-R ", manufactured by Nippon Kayaku Co., Ltd .: orange color under a normal light source, and orange color when irradiated with ultraviolet light." (trade name "Kayaset Red")
SF-B ", manufactured by Nippon Kayaku Co., Ltd .: Red under a normal light source, and red when irradiated with ultraviolet rays.
yaset RedSF-4G ", manufactured by Nippon Kayaku Co., Ltd .: red under a normal light source, and red when irradiated with ultraviolet rays.

In the present invention, these water-insoluble and organic solvent-soluble fluorescent dyes are used in the form of particles. Although the size of the particles is usually 200 μm or less, in the present invention, when the fluorescent dye particles are chromatic under a normal light source,
By making it impossible to visually recognize the fact that the sheet is included in the sheet under a normal light source, the forgery prevention effect can be enhanced accordingly. In this case, the particle diameter varies depending on the hue, but a particle diameter of 50 μm or less is used. However, as described later, in the case of a forgery prevention paper having a structure in which the dye particles are present in the inner layer and not in the outer layer by laminating three layers, the dye is covered by the outer layer.
A dye having a relatively large particle size of about μm can be used. The amount of the water-insoluble and organic solvent-soluble fluorescent dye particles added to the paper varies depending on the type of the dye, the use as the forgery prevention paper, and the like.
It is in the range of 1-0.5% by weight.

In the present invention, any method may be adopted as a method of incorporating the water-insoluble and organic solvent-soluble fluorescent dye particles into the paper. Hereinafter, an example will be described. In the present invention, these fluorescent dyes may be used alone or in combination of two or more. Production Example 1 Water-insoluble and organic after preparation of slurry to form paper
Papermaking by adding solvent-soluble fluorescent dye particles to the slurry
In producing the anti-counterfeit paper of the present invention, softwood bleached kraft pulp (NBKP), hardwood bleached kraft pulp (LBKP), softwood bleached sulphite pulp (NBS) are usually used.
P), a slurry mainly composed of paper pulp such as thermomechanical pulp (TMP) is prepared, and various internal fillers, dry paper strength enhancer, sizing agent, fixing agent, retention improver, drainage An auxiliary agent for papermaking such as an enhancer, an antifoaming agent, a dye, and a coloring pigment is appropriately used in combination, and usually has a freeness of 550 to 250 m.
1C. S. F. A slurry is prepared, and the above-mentioned water-insoluble and organic solvent-soluble fluorescent dye particles are added thereto, and the paper is made using a well-known paper machine such as a round paper machine or a fourdrinier paper machine.

Commercially available high-quality papers include water-soluble 4,4'-diaminostilbene disulfonic acid derivatives, stilbentriazinyl derivatives, 4,4'-bistriazinylaminostilbene, 2,2'-disulfonic acid derivatives, and the like. The apparent whiteness of the paper is improved by fixing the pulp with a water-soluble stilbene-based fluorescent whitening agent or the like. In this case, these fluorescent whitening agents are distributed in a state of covering the surfaces of the cellulose fibers constituting the paper uniformly. Fluorescent whitening agents also have the property of emitting blue-white or blue-violet light when irradiated with ultraviolet light.
The entire surface emits blue-white or blue-violet light.

In the present invention, the water-insoluble and organic solvent-soluble fluorescent dye does not elute due to the action of water in the paper-making process, and therefore exists in the form of particles in the paper. By setting the particle size of the fluorescent dye to an appropriate size, the presence thereof cannot be visually recognized under normal illumination, and the presence of the fluorescent dye can be made visible by irradiating with ultraviolet light. It is considered that the reason for this is that under normal illumination, the particles cannot be visually recognized due to the small particle size, but can be visually recognized by irradiating with ultraviolet rays by themselves emitting strong light. In the anti-counterfeit paper of the present invention, in order to make the water-insoluble and organic solvent-soluble fluorescent dye particles visible by ultraviolet irradiation,
It is necessary that the above-mentioned water-soluble fluorescent whitening agent is not used, or that it is used in a small amount that does not inhibit the effect of the present invention even if used.

Production Example 2 During the flow of the slurry for forming paper to the paper machine,
An aqueous suspension of soluble and organic solvent-soluble fluorescent dye particles
Using a slurry that does not contain the water-insoluble and organic solvent-soluble fluorescent dye particles of Production Example 1 and uses a well-known paper machine such as a round paper machine or a fourdrinier paper machine. When making a paper, in a flow box of a fourdrinier paper machine or in a vat of a round paper machine, use a pump or the like in a state in which fluorescent dye particles that are water-insoluble and organic solvent-soluble are suspended in water. Add and make paper.

In the present invention, the forgery prevention paper is formed by laminating at least three or more layers,
Preferably, only the inner layer contains the water-insoluble and organic solvent-soluble fluorescent dye particles. The reason is that if the water-insoluble and organic solvent-soluble fluorescent dye particles are present in a state of being exposed on the paper surface, the dye particles themselves have no self-adhesiveness, so in the case of gravure printing, This is because there is no problem, but the problem that the dye particles drop off during offset printing is likely to occur. In order to manufacture a multi-layered paper having three or more layers, for example, when forming a three-layer paper using a three-tank type circular paper machine, an inner layer (in this case, a center layer) is used. Only the above method may be used to allow the presence of water-insoluble and organic solvent-soluble fluorescent dye particles. In the anti-counterfeit paper of this configuration, the fluorescent dye contained in the inner layer is dissolved by the permeation of the organic solvent and diffuses to the paper surface by the capillary phenomenon, so that the object of the present invention is hindered even if the fluorescent dye is contained in the inner layer. Nothing to do.

Production Example 3 When paper is made with a fourdrinier paper machine, water is not applied to the wet paper web on the papermaking net.
Sprinkle soluble and organic solvent-soluble fluorescent dye particles
Method When using a Fourdrinier paper machine to make a paper using the slurry to which the water-insoluble and organic solvent-soluble fluorescent dye particles of Production Example 1 are not added, the wet paper on the fourdrinier paper machine Water-insoluble and organic solvent-soluble fluorescent dye particles are sprinkled on the paper over the entire surface or in a streak shape using a sprinkler or the like, and thereafter the paper is made according to a conventional method.

Production Example 4 When paper is made with a fourdrinier paper machine, water is not applied to the wet paper web on the papermaking net.
An aqueous suspension of soluble and organic solvent-soluble fluorescent dye particles
Sprinkling Method When making a paper using a Fourdrinier paper machine by using the slurry of Production Example 1 to which the water-insoluble and organic solvent-soluble fluorescent dye particles are not added, a paper web of a fourdrinier paper machine is used. Water-insoluble and organic solvent-soluble fluorescent dye particles are suspended in water on a wet paper and sprinkled on the entire surface or in a streak form using a sprinkler or a nozzle sprayer. Thereafter, papermaking is performed according to a conventional method.

Production Example 5 A water-insoluble and organic solvent-soluble fluorescent
Method of Using Photo-Dye Particles In combination with the slurry of Production Example 1 to which no water-insoluble and organic solvent-soluble fluorescent dye particles are added, and using a fourdrinier paper machine, a size press is used. Then, water-insoluble and organic solvent-soluble fluorescent dye particles are suspended in a size press solution such as modified starch, polyacrylamide, polyvinyl alcohol, etc., and applied to the surface of a wet paper, followed by papermaking according to a conventional method.

Production Example 6 Water-based paint using a coater such as an air knife coater
Water-insoluble and organic solvent-soluble fluorescent dye when coating
Charge particles using a slurry without addition of fluorescent dye particles of water-insoluble and organic solvent soluble manner as in Preparation Example 1 used in combination, after the paper using a Fourdrinier paper machine and cylinder paper machine, art paper and coat Water-insoluble and organic solvent-soluble fluorescent dye particles are added to a coating liquid for paper production or the like, and paper is produced using a coating machine such as an air knife coater or a blade coater.

Production Example 7 When printing on paper, water-insoluble in water-based ink and organic
Method of adding solvent-soluble fluorescent dye particles Water-insoluble and organic solvent-soluble fluorescent dye particles are added to an aqueous ink, and predetermined characters or patterns are printed on paper using a printing machine. At this time, it is necessary to use a paper that does not use a fluorescent whitening agent for the above-described reason. Printing may be performed during papermaking with a papermaking machine (on-machine printing using a flexographic printing machine or the like), or may be performed using a gravure printing machine or the like after papermaking (off-machine printing). ). For example, if a character "VOID" is printed, if the character is falsified with an organic solvent, the character "VOID" can be made to emerge, and this character can be visually recognized by irradiation of ultraviolet rays.

In the present invention, of the various methods described above, the yield of water-insoluble and organic solvent-soluble fluorescent dye particles is good (due to the small particle size of the fluorescent dye when added to the slurry, the dye is removed from the papermaking net). Easy to leak)
And, because it does not contaminate the paper machine, etc., when using a water-insoluble and organic solvent-soluble fluorescent dye particles in combination with the size press solution, or when applying an aqueous paint using a coater such as an air knife coater It is preferable to adopt a method of using the fluorescent dye particles in combination, or a method of adding water-insoluble and organic solvent-soluble fluorescent dye particles to the aqueous ink when printing on paper.

Examples are described below, but are based on parts by weight, g / m ²
Means a value in terms of solid content.

EXAMPLE 1 350 parts of 20 parts by weight of NBKP and 80 parts by weight of LBKP
C. S. F. 10 parts by weight of clay, 0.3 parts by weight of a paper strength agent (trade name "Polystron 191", manufactured by Arakawa Chemical Industry Co., Ltd.), a sizing agent (trade name "Size Pine E", Arakawa 1.0 parts by weight manufactured by Chemical Industry Co., Ltd.)
An appropriate amount of a sulfuric acid band was added to prepare a slurry. Into this slurry, water-insoluble and organic solvent-soluble fluorescent dye particles having an average particle diameter of about 50 μm (trade name “Kayaset Ye”)
llow SF-G ", manufactured by Nippon Kayaku Co., Ltd.)
8 parts by weight were added and dispersed. Using this slurry, anti-counterfeit paper having a basis weight of 100 g / m ^{2 was formed on} a fourdrinier paper machine according to a conventional method. At this time, polyvinyl alcohol of 0.2 was used with a size press installed in the middle of the drying zone.
A weight% aqueous solution was applied. Although the presence of the fluorescent dye particles could not be visually recognized in the obtained anti-counterfeit paper even when observed under fluorescent lamp illumination, fine fluorescent dye particles that developed yellow when irradiated with ultraviolet light (black light) in a dark room were removed. I could see it.

Example 2 350 parts of 20 parts by weight of NBKP and 80 parts by weight of LBKP
C. S. F. 10 parts by weight of clay, 0.3 parts by weight of a paper strength agent (trade name "Polystron 191", manufactured by Arakawa Chemical Industry Co., Ltd.), a sizing agent (trade name "Size Pine E", Arakawa 1.0 parts by weight manufactured by Chemical Industry Co., Ltd.)
An appropriate amount of a sulfuric acid band was added to prepare a slurry. Using this slurry in a Fourdrinier paper machine according to a conventional method, the basis weight is 100 g / m.
During the papermaking of paper No. ² , a water-insoluble and organic solvent-soluble fluorescent dye particle having an average particle diameter of about 250 μm was added to a 0.2% by weight aqueous solution of polyvinyl alcohol by a size press installed in the middle of a drying zone during papermaking. Product name "Kayase
A liquid in which 0.04% by weight of “t Red SF-4G” (manufactured by Nippon Kayaku Co., Ltd.) was dispersed was applied and dried in accordance with a conventional method to produce anti-counterfeit paper. Although the presence of the fluorescent dye particles could not be visually recognized in the obtained anti-counterfeit paper even under fluorescent lamp illumination, fine fluorescent dye particles that developed a red color when irradiated with ultraviolet light (black light) in a dark room were removed. I could see it.

EXAMPLE 3 350 parts of 20 parts by weight of NBKP and 80 parts by weight of LBKP
C. S. F. 10 parts by weight of clay, 0.3 parts by weight of a paper strength agent (trade name "Polystron 191", manufactured by Arakawa Chemical Industry Co., Ltd.), a sizing agent (trade name "Size Pine E", Arakawa 1.0 parts by weight manufactured by Chemical Industry Co., Ltd.)
An appropriate amount of a sulfuric acid band was added to prepare a slurry. Using this slurry in a Fourdrinier paper machine according to a conventional method, the basis weight is 100 g / m.
² base paper was made. Next, kaolin (trade name “UW
-90 ", 75 parts by weight manufactured by Engelhard Co., Ltd., 25 parts by weight of calcium carbonate (trade name" TP-222HS ", manufactured by Okutama Industry Co., Ltd.), starch as a binder (trade name" MC-3000 ", Shikishima) Starch Co., Ltd. 6
Parts by weight, SBR latex (trade name "Nipol LX40
7C ", manufactured by Nippon Zeon Co., Ltd.) A water-based paint (concentration: 35% by weight) mainly comprising 12 parts by weight was prepared according to a conventional method, and a water-insoluble and organic solvent-soluble material having an average particle size of about 150 μm was prepared. Fluorescent dye particles (trade name “TBO”, manufactured by Sumitomo Seika Co., Ltd.) were added in an amount of 0.06% by weight based on the solid content of the paint. This paint was applied to both sides of the base paper in an amount of 15 g / m ² using an air knife coater, dried, and then subjected to a super calender treatment to produce anti-counterfeit paper. Although the presence of the fluorescent dye particles was not visible even when the obtained anti-counterfeit paper was observed under fluorescent lamp illumination, the fine fluorescent dye particles that developed a blue-white color when irradiated with ultraviolet rays (black light) in a dark room Was visible.

Example 4 The same water-based paint (concentration: 35% by weight) as in Example 3 was prepared, and water-insoluble and organic solvent-soluble fluorescent dye particles (trade name "Kayaset Yellow SF-
G ", manufactured by Nippon Kayaku Co., Ltd.) and (trade name" TB
O ", manufactured by Sumitomo Seika Co., Ltd.) and (trade name" Kaya
set Red SF-4G ”, manufactured by Nippon Kayaku Co., Ltd.)
Was added in an amount of 0.03% by weight based on the solid content of the paint. This paint was applied to both sides of the base paper in an amount of 15 g / m ² using an air knife coater, dried, and then subjected to a super calender treatment to produce anti-counterfeit paper. The anti-counterfeit paper obtained did not show the presence of the fluorescent dye particles even when observed under fluorescent light illumination. However, when it was irradiated with ultraviolet light (black light) in a dark room, it became yellow, red and blue-white. Fluorescent dye particles could be visually recognized.

COMPARATIVE EXAMPLE As a comparative example, a normal high-quality paper to which a stilbene-based fluorescent whitening agent (water-soluble and insoluble in an organic solvent) is internally added will be described.

Representative organic solvents were dropped on the surface of the anti-counterfeit paper obtained in each of the examples and the high-quality paper of the comparative example. Table 1 shows the results of observation by irradiating ultraviolet light (black light) under fluorescent lamp illumination in a room. In addition, it was confirmed that the same result was obtained under natural light and under illumination by an incandescent lamp.

[0034]

[Table 1]

When a large amount of the water-insoluble and organic solvent-soluble fluorescent dye particles themselves used in Examples 1 and 2 are gathered, they appear to be colored under ordinary illumination. If it is distributed in a very small amount, its presence becomes invisible under normal illumination (use of a very large amount makes the hue unique to the dye appear pale). This is due to the presence of small amounts of fine dye particles that exceed the resolution limit of the human eye. However, when the anti-counterfeit papers obtained in these examples are irradiated with ultraviolet light in a dark room, they emit a fluorescent color peculiar to the dye and can be visually recognized as fine particles. Although the water-insoluble and organic solvent-soluble fluorescent dye particles themselves used in Example 3 were colorless even when collected in a large amount, the anti-counterfeit paper of Example 3 was irradiated with ultraviolet rays in a dark room, and the dye-specific dye particles were not dyed. It emits a fluorescent color,
It can be visually recognized as fine particles.

When various organic solvents are dropped on the surface of the anti-counterfeit paper obtained in these examples, the dye contained in the paper is eluted by the action of the organic solvent and diffuses to the surroundings by capillary action. When the dripping surface was observed under fluorescent lamp illumination after the solvent was evaporated, in Examples 1 and 2, the hue caused by the dye used was visible except in the case of petroleum ether dripping. In Example 3, since the dye used was colorless, the dropping surface appeared to have no change. In Example 4, spot-like and different hues were visible.

Furthermore, when these papers were irradiated with ultraviolet light (black light) under fluorescent lamp illumination, in Examples 1 and 2, except for the case of petroleum ether dripping, the portion corresponding to the dripping surface was fluoresced to a color unique to each dye. It looked colored.

As a reference, the result of dropping water instead of the organic solvent was shown, but no change was observed in any case. Also, no change was observed in the case of the high-quality paper of the comparative example.

The above is the result of irradiating ultraviolet light under fluorescent lamp illumination and under fluorescent lamp illumination. The same results are obtained even when irradiating ultraviolet light under incandescent lamp illumination or natural light, or under incandescent lamp illumination or natural light. It was confirmed that the result was obtained. In addition, there are various water-insoluble and organic solvent-soluble fluorescent dyes other than those described above, and the solubility in an organic solvent is also different. Therefore, various fluorescent dyes may be used depending on the performance required for the forgery prevention paper.

[0040]

The anti-counterfeit paper of the present invention is constituted as described above and has remarkable effects as described below. 1) Passports, traveler's checks, checks, bills, identification cards, and the like are often written using a ball-point pen using oil-soluble ink, but the anti-counterfeit paper of the present invention uses such a type of anti-counterfeit print. It can be suitably used for applications. Traces of tampering with an organic solvent can be easily recognized by irradiation of ultraviolet light even in a bright room, and there is also an effect that a tamper gives up tampering by coloring. 2) In addition, the scribing lottery paper (printing the hit or miss, printing this surface with aluminum powder and concealing it,
This method can be suitably used for a method in which a purchaser determines whether or not an aluminum powder is printed by rubbing the printed aluminum powder with a nail or the like. In other words, in the distribution process before the lottery is sold, remove the aluminum powder printing part using an organic solvent, read the omission, steal only the winning lottery, and perform the aluminum powder printing again for the offense. The prevention effect is great. 3) In addition, since the types of fluorescent dyes that are insoluble in water and soluble in organic solvents are abundant, for example, the types and amounts of the fluorescent dyes are changed for each lot and added to paper. The anti-counterfeit paper of the present invention can also be suitably used in applications where it can be determined whether the product is a lot.

 ──────────────────────────────────────────────────続 き Continuing from the front page (72) Inventor Yoshihiko Fukumuro 501 Honjuku, Nagaizumi-cho, Sunto-gun, Shizuoka Prefecture F-term (reference) 4L055 AG96 AH02 AJ01 BD12 BD18 FA12 GA45

Claims (6)

[Claims] An anti-counterfeit paper characterized in that the paper contains fluorescent dye particles which are water-insoluble and organic solvent-soluble. 2. The forgery prevention paper according to claim 1, wherein the fact that the fluorescent dye particles are contained in the paper cannot be visually recognized under a normal light source. 3. The anti-counterfeit paper according to claim 1, wherein the paper contains the fluorescent dye particles that emit different colors when irradiated with ultraviolet rays. 4. The anti-counterfeit paper is formed by laminating at least three or more layers, and the inner layer only contains the water-insoluble and organic solvent-soluble fluorescent dye particles. Any one of claims 1 to 3
Anti-counterfeit paper as described in paragraph. 5. The anti-counterfeit paper according to claim 1, wherein the water-insoluble and organic solvent-soluble fluorescent dye is present near the surface of the paper. 6. The forgery prevention paper according to claim 5, wherein the water-insoluble and organic solvent-soluble fluorescent dye is formed in a character or pattern.