JP2003073600A - Forgery preventive ink, forgery-proof printed matter, and method for judging authenticity of the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a forgery preventive ink with which a latent image such as concealed letters capable of being hardly forged with a color copying machine, can be formed at a low cost and which enables authentic judgment with a simple apparatus, and to provide a forgery-proof printed matter and a method for judging authenticity. SOLUTION: A polarizing pigment, a polarizing cholesteric polymer liquid crystal pigment, comprises at least a binder and the pigment having a flaky shape. The forgery preventive ink contains the polarizing pigment comprising a dextro-rotatory pigment and/or a levo-rotatory pigment. A forgery-proof printed matter 1 has a forgery preventive printed layer 21 formed on a base material 11 via a black colored layer 22 by using the forgery preventive ink. The method for judging authenticity is carried out on the forgery-proof printed matter 1 by using an authenticity judging filter comprising a circularly polarizing plate.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an anti-counterfeit ink for displaying hidden characters and patterns which cannot be copied by a copying machine or the like, and an anti-counterfeit printed matter printed using this ink. , Gift certificates, vouchers, tickets, banknotes, passports, identification cards, securities, cards, etc. can be added to products requiring anti-counterfeiting, and authenticity can be determined using a dedicated verification medium. The present invention relates to anti-counterfeit printed matter.

[0002]

2. Description of the Related Art Conventionally, there are various methods for forming a latent image. For example, use a gap between lines to insert hidden characters, and hide the lines to show hidden characters. There is pencil out printing (decomat) where pencil dust adheres to the printed area and hidden characters appear when rubbed. Since these latent image images are easily seen, they are used for play rather than as full-scale latent images. Further, for example, an irreversible thermosensitive coloring ink is an ink that develops color when heat is applied, and there is one using a white or colorless transparent ink, but it is effective as a latent image, but for displaying a latent image. The heat source device is required, and it is not possible to erase what was once displayed as a latent image, so that its use is limited. Also,
There is a method of displaying a latent image by printing a white ink containing a filler harder than a metal such as titanium oxide on white paper and rubbing it with a coin, etc. It can be eliminated, but its use is limited because it can be displayed only once. On the other hand, a reversible thermosensitive ink (thermochromic ink) is a medium that can be repeatedly displayed. The thermochromic ink is an ink that reversibly develops color when heat is applied, and when heat is applied, the color is developed or decolored, and when left for a while, it returns to its original state. This ink is also used as a latent image or in the form of hiding the image, but its use is limited due to poor resistance, particularly heat resistance. Further, there is a photochromic ink as a medium that can be repeatedly displayed, and this photochromic ink is an ink that develops color when irradiated with light, especially ultraviolet rays, and is used as a latent image because it has a white or colorless transparent ink. However, its application is limited due to its poor resistance, especially its light resistance. Fluorescent ink is an ink issued by irradiating ultraviolet rays, and is used as a latent image because it has white or colorless transparent ink. This fluorescent ink is classified into an organic type and an inorganic type. The organic type emits light when it is contained in a printing ink in a very small amount, but its use is limited due to its weak light resistance. Further, it is necessary to add a large amount of the inorganic type to the printing ink (about 10 to 20%), and the latent image will be visually recognizable, so it is necessary to devise the design and the like. Furthermore, halftone dots and line moire (interference fringes)
The method of forming a latent image by using the method is to partially change the pitch or angle of halftone dots or lines to form a transparent film of halftone dots or lines arranged in order on the latent image. Occurs, and an image appears. In this case, a simple display medium can be repeatedly used, but a complicated image cannot be formed. Also,
A latent image with magnetic ink is formed by pattern-wise magnetizing a magnetic layer having a magnetically recordable coercive force (about 300 Oe or more), and iron powder is sprinkled on the magnetic layer to form a magnetized portion. This is a method of displaying an image by utilizing the property of collecting iron powder. In this method, the process of displaying a latent image is complicated, and rewriting of the image is possible, so that the application is limited. In addition, a latent image is formed by forming an image with an ink that absorbs infrared light by utilizing the infrared region, covering the image so that it is not visible, and providing a layer that transmits light in the infrared region. However, in order to display this latent image, an infrared camera or the like is necessary, which is a large scale for the device. Ink that is white or colorless in the visible region but has absorption in the infrared region (I
V ink), but this also requires an infrared camera or the like as described above.

On the other hand, with the recent widespread use of copying machines using electrophotographic technology, if a recent color copying machine is used, it is extremely difficult for anyone to easily distinguish a manuscript or a copy. It can be easily created. Thus, while color copying is convenient, there is an increasing problem that securities such as stock certificates, bonds, promissory notes and checks, and printed matter such as admission tickets and boarding passes are easily forged. As a means for restraining such copying and improving security, forgery prevention technology by various copying is applied to the securities and the like. For example, copy protection technology using the base material itself such as watermarked paper, colored paper, and paper with chips, printing of tint block, color pattern, stick color pattern, logo line, and special ink such as fluorescent ink, decolorizing ink, etc. There is a copy protection technique by special printing using the above, and a copy protection technique called a digital watermark created by including information indicating that the print document is a copy prohibited object. However, these techniques have problems that they are complicated and the cost is high.

[0004]

SUMMARY OF THE INVENTION The present invention solves the problems of the prior art, which is difficult to counterfeit by a commercially available color copying machine.
Anti-counterfeiting ink and anti-counterfeit printed matter and its authenticity determination method that enables latent image formation such as hidden characters and patterns to be formed at a low price, and that the latent image can be identified with a simple device. To provide.

[0005]

In order to achieve the above object in the present invention, first, in the invention of claim 1, at least a binder and a flake-like polarizing pigment are contained, and the polarized light Either a right-polarizing pigment that reflects a right-handed polarized light of the incident light or a left-polarized pigment that reflects a left-handed polarized light of the incident light. It is an anti-counterfeit ink which is characterized in that it is only.

According to the invention of claim 2, at least:
A binder and a flake-shaped polarizing pigment are contained, and the polarizing pigment includes a right-polarizing pigment that reflects a part of the right-handed polarized light of the incident light and a left-handed rotating of the incident light. Of the anti-counterfeiting ink containing at least both of the left-polarizing pigment that reflects a part of the polarized light, and the right-polarizing pigment and the left-polarizing pigment are mixed. .

In the invention of claim 3, the right polarizing pigment and the left polarizing pigment have different hues from each other, and the anti-counterfeit ink according to claim 2 is used. .

Further, in the invention of claim 4, the right polarizing pigment and the left polarizing pigment have the same hue as each other, and the anti-counterfeit ink according to claim 2 is provided. .

Further, in the invention of claim 5, the anti-counterfeit ink is characterized in that the right polarizing pigment and the left polarizing pigment have similar hues to each other.

Further, in the invention of claim 6, the right-polarizing pigment is a right-polarizing cholesteric polymer liquid crystal pigment in which the direction of rotation of the twist axis is right-handed.
The anti-counterfeit ink according to any one of 1 to 5.

Further, in the invention of claim 7, the left-polarizing pigment is a left-polarizing cholesteric polymer liquid crystal pigment whose twist axis rotates in a left-hand direction.
The anti-counterfeit ink according to any one of 1 to 5.

Further, in the invention of claim 8, the anti-counterfeit ink according to any one of claims 1 to 7 is characterized in that it contains a solvent for dilution and is liquefied by coating. .

According to a ninth aspect of the invention, the anti-counterfeit ink according to any one of the first to seventh aspects is characterized in that a UV curable resin is used as the binder.

Further, in the invention of claim 10, an anti-counterfeit print layer is formed on at least a part of the substrate, and the anti-counterfeit print layer contains at least a binder and a flake-like polarizing pigment. The polarizing pigment contains a right-polarizing pigment that reflects a right-handed polarized light of the incident light or a left-handed polarized light that reflects a left-handed polarized light of the incident light. The anti-counterfeit printed matter is characterized in that only one of the polarizing pigments is used.

Further, in the invention of claim 11, an anti-counterfeit print layer is formed on at least a part of the base material, and the anti-counterfeit print layer contains at least a binder and a flake-like polarizing pigment. The polarizing pigment contains a right-polarizing pigment that reflects a right-handed polarized light of incident light and a left-polarized light that reflects a left-handed polarized light of the incident light. The anti-counterfeit printed material is characterized in that the right polarizing pigment and the left polarizing pigment are mixed and include at least both of a pigment.

Further, in the invention of claim 12, the right polarizing pigment and the left polarizing pigment have different hues from each other, and the anti-counterfeit printed matter according to claim 11 is provided. .

Further, in the invention of claim 13, the right polarizing pigment and the left polarizing pigment have the same hue as each other, and the anti-counterfeit printed matter according to claim 11 is provided. .

Further, in the invention of claim 14, the anti-counterfeit printed matter according to claim 11, wherein the right polarizing pigment and the left polarizing pigment have similar hues to each other.

According to the fifteenth aspect of the present invention, a colored printing layer is provided between the forgery prevention printing layer and the substrate, and a part or all of the colored printing layer is the forgery prevention printing. 15. Covered with layers.
Which is the anti-counterfeit printed matter.

According to a sixteenth aspect of the invention, the forgery-preventing printed matter according to the fifteenth aspect is characterized in that the color system of the color printing layer is a black system.

According to a seventeenth aspect of the present invention, the anti-counterfeit print layer is formed on an image using at least one of letters and patterns, and the colored print layer is also anti-counterfeit. The image having the same size as that of the printing layer is formed to have the same size, and corresponding portions of the images of the anti-counterfeiting printing layer and the colored printing layer are formed so as to substantially overlap each other. Item 15 is the anti-counterfeit printed matter.

In the invention of claim 18, the anti-counterfeit print layer is formed on an image using at least one of letters and patterns, and the colored print layer is the anti-counterfeit print layer. The anti-counterfeit printed matter according to claim 15 or 16, wherein the image is the same as the printed layer and smaller than the image of the anti-counterfeit printed layer.

According to the eighteenth invention, the tenth invention is
To the anti-counterfeiting printed layer of the anti-counterfeiting printed matter according to any one of claims 1 to 18 by visually observing the anti-counterfeiting printed layer through an authenticity determination filter using at least a circularly polarizing plate as an optical filter. This is a method for determining the authenticity of an anti-counterfeit printed matter, which is characterized by performing the authenticity determination by utilizing the presence or absence of an optical effect caused by.

Further, in the eighteenth aspect of the present invention, both the optical image by the optical filter using the right polarizing plate and the optical image by the optical filter using the left polarizing plate are visually observed through the true / false determination filter. The method for determining the authenticity of an anti-counterfeit printed matter according to claim 19, wherein:

The colored printing layer according to claim 15 is
It is a layer printed with an ink containing a coloring material regardless of whether it is chromatic or achromatic. In addition, the term "blackish" as used in claim 16 means that the hue is black or looks blackish, and even if a coloring material having a hue far from black is partially used, it looks almost blackish as a whole. If Furthermore, the characters or patterns described in claims 17 and 18 include characters, numbers, symbols, pictures, or figures.

[0026]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described in detail below with reference to the drawings. FIG. 1 is a plan view showing an embodiment of an anti-counterfeit printed matter in which an anti-counterfeit printed layer is provided on a paper substrate using the anti-counterfeit ink of the present invention, and FIG. FIG. 3 is a cross-sectional view of the X plane, and FIG.
FIG. 4 is a schematic view of a case where a clockwise authenticity determination filter is placed on the anti-counterfeit printed matter, FIG. 4 is a schematic view when the phenomenon of FIG. 3 is viewed from a cross section, and FIG. FIG. 7 is a schematic view of the appearance when a counterclockwise authenticity determination filter is placed on the anti-counterfeit printed matter, and FIG. 6 is a schematic view of the phenomenon of FIG. FIG. 7 is a plan view showing an embodiment in which the anti-counterfeit ink of the present invention is printed on a paper substrate, and FIG. 8 is a cross-sectional view of the anti-counterfeit printed product of FIG. FIG. 9 is a schematic view of the appearance when a genuineness / counterfeit determination filter is placed on the forgery-prevented printed matter of FIG.
FIG. 10 is a sectional view taken along the line BB of FIG. 9.

The anti-counterfeit printed matter 1 of the present invention is shown in FIG.
2 includes a base material 11 and a forgery prevention printing unit 2, and the forgery prevention printing unit 2 has, for example, a right polarization property as shown in FIG. 2 as a cross-sectional view taken along the line XX of FIG. The anti-counterfeit print layer 21 and the colored layer 22 containing a pigment are included. In addition, the anti-counterfeit printed matter 1 having the latent image of the present invention changes in color by changing the viewing angle. That is, as shown in FIG. 2, upon receiving natural light 25, the anti-counterfeiting printing section 2 exhibits different colors at the A viewpoint 26 and the B viewpoint 27, and further, in the portion on the colored layer 22, the color change becomes clear. It is a thing.

Further, the anti-counterfeit printed matter 1 of the present invention is, for example, a case where the anti-counterfeit printed matter 1 shown in FIG. 1 has a right-turning authenticity determination filter 3 as shown in the plan view of FIG. , The anti-counterfeit layer reflects a part of the incident light through the right-turning authenticity determination filter 3, and the hue 2 of the right polarizing pigment is
3 can be visually recognized.

FIG. 4 is a schematic view of the phenomenon of FIG. 3 described above by means of a cross-sectional view. Natural light 31 passes through the right-handed true / false determination filter 3 to become right-handed light 32, 33. Since the prevention layer 21 contains the right polarizing pigment,
Of the incoming right-handed light 32, 33, only the right-handed light 33 having a wavelength equal to the twist pitch is reflected on the surface of the anti-counterfeiting printing layer 21, and the reflected light C34 can be visually recognized.

FIG. 5 is a schematic view of how the counterclockwise authenticity determination filter 4 shown in FIG. 1 looks when the counterclockwise authenticity determination filter 4 is placed. For example, the counterclockwise authenticity determination filter 4 is shown. Through the, the forgery prevention printing unit 2 can transmit all of the incident light and visually recognize the hue 24 of the colored layer thereunder.

FIG. 6 is a schematic view of the phenomenon of FIG. 5 described above with a sectional view. For example, the natural light 31 passes through the counterclockwise true / false determination filter 4 so that the counterclockwise light 35,
36, but the anti-counterfeiting print layer 21 at this time contains the right-polarizing pigment, and therefore the incident left-handed light 35.
Are all transmitted, and the reflected light D3 of the colored layer 22 therebelow is
7 can be visually recognized.

Furthermore, the anti-counterfeit printed matter 5 shown in FIG.
Is composed of the base material 41 and the forgery prevention printing section 6, and the forgery prevention printing section 6 has a right polarization pigment and a left polarization property having different hues as shown in FIG. 8 as a cross section of the Y-Y plane of FIG. The anti-counterfeit print layer 42 containing a pigment and the black layer 45 are included. As described above, the anti-counterfeit printed matter 5 having the latent image of the present invention changes in color by changing the viewing angle. That is, upon receiving the natural light 51, the anti-counterfeit printing section 6 exhibits different colors at the C viewpoint 52 and the D viewpoint 53, and further, the color change becomes clear in the portion on the black layer 45.

Further, FIG. 9 is a schematic view of how the anti-counterfeit printed matter 5 shown in FIG. 7 looks when a genuine / counterfeit determination filter is put on it. The forgery prevention printing unit 6 can visually recognize the hue 43 of the right polarizing pigment. On the other hand, the anti-counterfeiting printing unit 6 can visually recognize the hue 44 of the left polarizing pigment through the counterclockwise true / false determination filter 8. Further, FIG. 10 is a schematic view of the phenomenon of FIG.
For example, the natural light 51 passes through the right-turning true / false determination filter 7 to become right-turning lights 54 and 55. Of the lights 54 and 55, only the right-turned light 54 having a wavelength equal to the twist pitch is reflected on the surface of the anti-counterfeiting printing layer 42, and the reflected light E56 can be visually recognized.
On the other hand, the natural light 51 passes through the counterclockwise rotation authenticity determination filter 8 to become counterclockwise rotation lights 57 and 58. Of the lights 57 and 58, the left-handed light 57 having a wavelength equal to the twist pitch is reflected on the surface of the anti-counterfeiting printing layer 42, and the reflected light F59 can be visually recognized.

The cholesteric polymer liquid crystal pigment, which is the main component of the right and left polarizing pigments, is a three-dimensionally crosslinkable liquid crystal substance having a chiral phase, and is three-dimensionally crosslinked to obtain a desired particle size. It is a pigment obtained by crushing. The light reflected by this pigment is circularly polarized light. Among the above-mentioned liquid crystalline substances, the cholesteric liquid crystal has a twisted structure, and the refractive index of light periodically changes along the twist axis, so that it selectively reflects light having a wavelength equal to the pitch. Therefore, it is possible to create a desired cholesteric color by controlling the pitch. Further, in the liquid crystal having a twisted structure, each molecule is arranged in layers, and the optical characteristics are formed only when the molecules are uniformly arranged in the layer. In this case, the molecule changes its preferential direction from layer to layer, resulting in a twisted structure. The orientation of each molecule is a known method,
It can be controlled, for example, by an alignment layer or an electric or magnetic field. In addition, a typical method of immobilization is to combine a three-dimensional crosslinkable liquid crystal substance having a chiral phase and a polyfunctional polymerizable compound, and three-dimensionally crosslink by ultraviolet irradiation to fix a twisted structure. Polymer liquid crystal can be made.

As the starting material for the cholesteric polymer liquid crystal, all cholesteric liquid crystal materials having a twisted structure having a pitch equal to the wavelength of light from ultraviolet rays to infrared rays are preferable. That is, a liquid crystal substance having a chiral phase can be manufactured by adding a chiral substance to a nematic, smectic or discotic structure. The type and molecular weight of the chiral substance determines the pitch of the twisted structure, and thus the wavelength of the reflected light. The twisting direction of the structure may be leftward or rightward. Further, the starting material has a polymerizable group, a polycondensable group or a group effective for polyaddition, and at least a part of these groups exhibits difunctionality, trifunctionality and polyfunctionality, and for example,
It is preferable to have a methacryloxy group, an acryloxy group and the like, and a three-dimensional crosslinkable liquid crystal polyorganosiloxane is preferable.

Further, in the method for producing the cholesteric polymer liquid crystal pigment, for example, a mixed solution of a three-dimensional crosslinkable liquid crystal polyorganosiloxane and a photopolymerization initiator is added to a metal support,
The liquid crystal molecules are aligned on a plastic support or a glass support while heating and applying a shearing force using a doctor. Next, the liquid crystal layer is irradiated with ultraviolet rays to be three-dimensionally crosslinked. The three-dimensionally crosslinked liquid crystal layer is peeled from the support and pulverized with a universal mill or the like to obtain a flake pigment. The size of the pigment has a particle size of 5 μm to 5 mm and 1 to 10
It has a thickness of 0 μm, preferably 5 to 50 μm. The support may optionally have an alignment layer of, for example, polyimide or polyvinyl alcohol. Further, as a method for aligning liquid crystal molecules, it is possible to shear between two sheets, and preferably polyethylene terephthalate is used.

The above anti-counterfeit ink can be an ink for various printing methods such as gravure printing and screen printing depending on the types of binders, dispersants and auxiliaries. The anti-counterfeit ink preferably contains, for example, 10 to 50% by weight of the cholesteric polymer liquid crystal pigment.

The right rotation true / false determination filter and the left rotation true / false determination filter according to the present invention are circularly polarizing plates, and the PVA-stretched film is made of PVA-containing iodine.
Polymer polycrystal types such as iodine type, dichroic dye type, metal or metal compound-containing type, polyene type, etc. are considered, and especially 1 / A is used for a polarizing film using a PVA-iodine type, dichroic dye type film. This is a stack of 4λ wavelength retardation films, and the right or left rotation direction is determined by advancing or retarding the retardation by 1 / 4λ.

[0039]

EXAMPLES Next, the present invention will be specifically described with reference to examples. Example 1 PETG (ethylene-1,4-cycloxylene dimethylene terephthalate) having a thickness of 188 μm
Anti-counterfeiting ink A consisting of the following [Composition 1 of anti-counterfeiting printing layer containing right-polarizing pigment] on the sheet of process black ink for screen printing with a thickness of about 2 μm by the screen printing method. Was printed by screen printing with a thickness of about 10 μm to obtain a counterfeit-proof printed matter. [Composition 1 of anti-counterfeiting printing layer containing right-polarizing pigment] Cholesteric polymer liquid crystal pigment (right twist structure) (Wacker Chemical Co., Ltd.) 10 parts by weight Screen ink medium (SS NSA medium Toyo Ink Mfg. Co., Ltd.) 90 Parts by weight

Looking at the anti-counterfeit printed matter obtained above,
A band of glossy ink was printed, and the black ink part had a more glossy feeling, and a color shift from green to blue could be confirmed by changing the visual angle. Further, the anti-counterfeiting print layer having a glossy feeling can be visually recognized when viewed through the right-handed authenticity determination filter, and the black layer can be visually recognized when viewed through the left-handed authenticity / counterfeit judging filter. As described above, the effect of OVI ink as well as the fact that it is possible to further determine the authenticity by the filter further enhances the anti-counterfeit effect. When the OVI ink was viewed with the genuineness / counterfeit determination filter, it looked black regardless of whether it was rotated left or right.

Example 2 A process black ink for a screen was printed on a high-quality paper having a basis weight of 90 g / m 2 in a thickness of about 2 μm by a screen printing method, and the following [right-polarizing pigment having different hues was used]. And the composition of the anti-counterfeit print layer containing a mixture of the left polarizing pigment and the anti-counterfeit ink B was printed at a thickness of about 10 μm by a screen printing method to obtain an anti-counterfeit print. [Composition of anti-counterfeit print layer containing mixture of right-polarizing pigment and left-polarizing pigment having the same hue] Cholesteric polymer liquid crystal pigment (right twist structure) (Wacker Chemical Co., Ltd.) 10 parts by weight cholesteric polymer liquid crystal Pigment (left twist structure) (Wacker Chemical Co., Ltd.) 10 parts by weight Screen Ink Medium (SS NSA Medium Toyo Ink Co., Ltd.) 80 parts by weight

Looking at the anti-counterfeit printed matter obtained above,
A band of glossy ink was printed, and the black ink part had a more glossy feeling, and a color shift from red to blue could be confirmed by changing the visual angle. In addition, when viewed through the right-handed authenticity judgment filter, the glossy red anti-counterfeit printing layer was visible, and when viewed through the counter-clockwise true-counterfeit judgment filter, the glossy blue anti-counterfeit printed layer was visible. . As mentioned above, OVI (Optica
l Variable Ink) In addition to the effect as ink, it is possible to further judge whether the filter is true or false, which further enhances the effect of preventing forgery. When the OVI ink was viewed with the genuineness / counterfeit determination filter, it looked black regardless of whether it was rotated left or right.

Example 3 A high-quality paper having a basis weight of 90 g / m 2 was printed with a process indigo ink for a screen in a thickness of about 2 μm by a screen printing method, and the following [right-polarizing pigment having the same hue] was printed thereon. And the composition of the anti-counterfeit print layer containing a mixture of the left-polarizing pigment and the anti-counterfeit ink C was printed by a screen printing method to a thickness of about 10 μm to obtain an anti-counterfeit print. [Composition of anti-counterfeiting printing layer containing mixture of right and left polarizing pigments having the same hue] Cholesteric polymer liquid crystal pigment (right twist structure) (Wacker Chemical Co., Ltd.) 5 parts by weight cholesteric polymer liquid crystal Pigment (left twist structure) (Wacker Chemical Co., Ltd.) 5 parts by weight Screen ink medium (SS NSA Medium Toyo Ink Co., Ltd.) 90 parts by weight

Looking at the anti-counterfeit printed matter obtained above,
A band of glossy ink was printed, and in particular, the indigo ink part had a more glossy feeling, and a color shift from green to blue could be confirmed by changing the visual angle. Further, when viewed through the right-handedness determination filter, the green glossy anti-counterfeiting print layer can be visually recognized, and when viewed through the left-handed trueness / counterfeit determination filter, the glossy green anti-counterfeit printing layer can be visually recognized. As described above, the effect of OVI ink as well as the fact that it is possible to further determine the authenticity by the filter further enhances the anti-counterfeit effect. When the OVI ink was viewed with the genuineness / counterfeit determination filter, it looked black regardless of whether it was rotated left or right.

[0045]

Since the present invention has the above-mentioned constitution, it has the following effects. That is, the polarizing pigment is a polarizing cholesteric polymer liquid crystal pigment, contains at least a binder and the flake-shaped polarizing pigment, the polarizing pigment is either a right polarizing pigment or a left polarizing pigment, only one, Alternatively, the anti-counterfeit print layer is formed by using the anti-counterfeit print layer formed by using the anti-counterfeit print ink containing both of them to form an anti-counterfeit print layer.
Color shift occurs depending on the viewing angle, which is the same effect as a VD (Optical Variable Device) image, it is difficult to forge by a commercially available color copying machine, and the formation of these latent images of characters and patterns is inexpensive. Further, it is possible to provide a forgery-prevented printed material and a method for determining its authenticity, which enables a simple device to determine whether the latent image is a genuine product or a forged product.

In the present invention, by providing a black print layer between the anti-counterfeit print layer and the base material, the color shift depending on the visual angle is reproduced more vividly, and the anti-counterfeit print product having an excellent OVD effect is obtained. Can be

Therefore, the present invention provides an anti-counterfeit ink for displaying hidden characters and patterns that cannot be copied by a copying machine or the like, and an anti-counterfeit printed matter printed with this ink, for example, a gift certificate. , A cash voucher, ticket, banknote, passport, identification card, securities, card, etc., added to products requiring anti-counterfeiting, and using a dedicated verification medium, as an anti-counterfeit printed matter,
It has excellent practical effects.

[Brief description of drawings]

FIG. 1 is a front view showing an embodiment of an anti-counterfeit printed material according to the present invention.

FIG. 2 is a sectional view taken along line XX of FIG. 1, showing an embodiment of the anti-counterfeit printed material of the present invention.

FIG. 3 is an explanatory diagram showing from the front an embodiment of authenticity determination of an anti-counterfeit printed matter of the present invention.

4 is a sectional view taken along line XX of FIG. 3, showing an embodiment of authenticity determination of the anti-counterfeit printed matter of the present invention.

FIG. 5 is an explanatory view showing, in a front view, another embodiment of authenticity determination of the anti-counterfeit printed matter of the present invention.

FIG. 6 is a sectional view taken along line XX of FIG. 5, showing another embodiment of authenticity determination of the anti-counterfeit printed matter of the present invention.

FIG. 7 is an explanatory view showing another embodiment of the anti-counterfeit printed material of the present invention on the front side.

FIG. 8 shows another embodiment of the anti-counterfeit printed material of the present invention, and is a sectional view taken along the line YY of FIG. 7.

FIG. 9 is an explanatory view showing another embodiment of the authenticity determination, which is another embodiment of the anti-counterfeit printed matter of the present invention, on the front side.

FIG. 10 is another embodiment of the anti-counterfeit printed matter of the present invention,
FIG. 10 is a cross-sectional view taken along the line BB of FIG. 9, showing another embodiment of the authenticity determination.

[Explanation of symbols] 1,5 ... Counterfeit-proof printed matter 2, 6 ... Anti-counterfeiting printing department 3,7 ........ Right rotation true / false judgment filter 4,8 ... Counterclockwise true / false judgment filter 11,41 ... Base material 21, 42 ... Anti-counterfeit print layer 22, 45 ... Colored layer 23, 43 ... Hue of right polarizing pigment 24 ... Hue of colored layer 25, 31, 51 ... Natural light 26 ... Reflected light A 27 ... Reflected light B 32, 33, 54, 55 ... Incident light with right rotation 34 ... Reflected light C 35, 36, 58, 59 ... Left-handed incident light 37 ... Reflected light D 44 ... Hue of left polarizing pigment 56 ... Reflected light E 57 ... Reflected light F

   ─────────────────────────────────────────────────── ─── Continued front page    F-term (reference) 2C005 HA02 HA04 HB02 HB10 HB13                       JA09 JB11 KA40 KA51 KA57                       LA23                 2H113 AA01 AA03 AA06 BB02 BB08                       BB22 BC02 BC09 BC10 CA34                       CA39 CA46 DA41                 3E041 AA01 AA03 BA09 BB03 DB01                 4J039 BD04 BE01 EA06 GA03 GA04                       GA13

Claims (20)

[Claims] 1. A right polarizing pigment containing at least a binder and a flake-like polarizing pigment, wherein the polarizing pigment reflects a part of right-handed polarized light of incident light. Alternatively, the anti-counterfeit ink is characterized in that only one of the left-polarizing pigments that reflects a part of the left-handed polarized light of the incident light is reflected. 2. At least a binder and a flake-shaped polarizing pigment are contained, and the polarizing pigment is a right polarizing pigment which reflects a part of the right-handed polarized light in incident light, A counterfeit characterized by including at least both a left-polarizing pigment that reflects a part of the left-handed polarized light of the incident light, wherein the right-polarizing pigment and the left-polarizing pigment are mixed. Prevention ink. 3. The right polarizing pigment and the left polarizing pigment have different hues from each other.
Anti-counterfeit ink described in. 4. The anti-counterfeit ink according to claim 2, wherein the right polarizing pigment and the left polarizing pigment have the same hue. 5. The anti-counterfeit ink, wherein the right polarizing pigment and the left polarizing pigment have similar hues to each other. 6. The anti-counterfeit ink according to claim 1, wherein the right-polarizing pigment is a right-polarizing cholesteric polymer liquid crystal pigment whose twist axis rotates in a right-handed direction. . 7. The anti-counterfeit ink according to claim 1, wherein the left-polarizing pigment is a left-polarizing cholesteric polymer liquid crystal pigment whose twist axis rotates in a left-handed direction. 8. The anti-counterfeit ink according to any one of claims 1 to 7, wherein the anti-counterfeit ink also contains a diluent solvent and is liquefied by coating. 9. The anti-counterfeit ink according to claim 1, wherein a UV curable resin is used as the binder. 10. An anti-counterfeit printing layer is formed on at least a part of a base material, and the anti-counterfeit printing layer contains at least a binder and a flake-like polarizing pigment. Either a right-polarizing pigment that reflects a right-handed polarized light of the incident light or a left-polarized pigment that reflects a left-handed polarized light of the incident light. Anti-counterfeit printed matter characterized by being only. 11. An anti-counterfeit printing layer is formed on at least a part of a substrate, and the anti-counterfeit printing layer contains at least a binder and a flake-like polarizing pigment. The functional pigment includes at least both a right polarizing pigment that reflects a right-handed polarized light of the incident light and a left-polarized pigment that reflects a left-handed polarized light of the incident light. The anti-counterfeit printed matter, wherein the right polarizing pigment and the left polarizing pigment are mixed. 12. The right polarizing pigment and the left polarizing pigment have different hues from each other.
The anti-counterfeit printed matter according to 1. 13. The right polarizing pigment and the left polarizing pigment have the same hue as each other.
Anti-counterfeit printed matter described in. 14. The right polarizing pigment and the left polarizing pigment have similar hues to each other.
The anti-counterfeit printed matter according to 1. 15. Between the anti-counterfeit print layer and the substrate,
The anti-counterfeit printed matter according to any one of claims 10 to 14, wherein the anti-counterfeit printed layer is provided with a colored printed layer, and part or all of the colored printed layer is covered with the anti-counterfeit printed layer. . 16. The forgery-preventing printed matter according to claim 15, wherein the color system of the color printing layer is a black system. 17. The anti-counterfeit print layer is formed on an image using at least one of letters and patterns, and the colored print layer has the same image as the anti-counterfeit print layer. 2. The anti-counterfeiting printing layer and the color-based printing layer are formed so as to substantially overlap with each other in corresponding portions of the image formed in a size.
The anti-counterfeit printed matter according to any one of 5 and 16. 18. The anti-counterfeit print layer is formed on an image using at least one of letters and patterns, and the colored print layer is the same image as the anti-counterfeit print layer and The anti-counterfeit printed matter according to claim 15, which is formed to be smaller than the image of the anti-counterfeit printed layer. 19. The visual inspection of the anti-counterfeit printed layer of the anti-counterfeit printed article according to claim 10 through at least a genuine / counterfeit determination filter using a circularly polarizing plate as an optical filter, A genuineness / counterfeit determination method for an anti-counterfeit printed matter, which is characterized by performing genuineness / counterfeit determination by utilizing at least the presence or absence of an optical effect caused by the polarization property of the polarizing pigment. 20. When visually observed through the authenticity determination filter, an optical image by an optical filter using a right polarizing plate,
The authenticity determination method for a forgery-prevented printed matter according to claim 19, wherein both of optical images obtained by an optical filter using a left polarizing plate are used.