JP2011201026A - Laminated display body - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a laminated display body with a higher forgery preventing effect and with difficult re-inking of a special ink as a special printing with an infrared ray ink as a forgery preventing medium is applied but there exists a possibility of extracting and re-inking this ink to perform the forgery.SOLUTION: In the laminated display body, a first resin layer including an inorganic phosphor pigment excited by infrared rays and emitting a light in an infrared ray wavelength region is laminated on a substrate, and a second resin layer not including inorganic phosphor pigment is at least laminated between the substrate and the first resin layer.

Description

  The present invention relates to a multilayer display body having an anti-counterfeit medium, and relates to a multilayer display body in which an image for preventing forgery is concealed in an invisible state.

Conventionally, in order to prevent forgery and falsification of printed materials such as documents, cash vouchers, cards, etc., fluorescent light that can not be recognized with normal visible light, etc., but can be distinguished by emitting fluorescence only in the visible light region. There is a latent image technology.
In order to form this fluorescent latent image, it can be produced by printing using an ink that fluoresces with ultraviolet rays.

  However, this anti-counterfeiting method can be confirmed visually by purchasing inexpensive black light and irradiating it with ultraviolet rays, so that an unspecified number of people can recognize the existence of the anti-counterfeiting technology.

  On the other hand, in the medium that requires advanced anti-counterfeiting technology, the anti-counterfeiting effect that can be detected only by a very limited number of people is desired because only the above-mentioned fluorescent light-emitting ink has little anti-counterfeiting effect. Infrared absorbing ink and infrared emitting ink have been developed.

  Even if this infrared ray absorbing ink or infrared light emitting ink is irradiated with infrared rays, its effect cannot be observed with the naked eye, and it can be obtained only with a specific visualization device, and has a high anti-counterfeit effect. (See Patent Document 1 and Patent Document 2 below)

In addition, the infrared absorbers and infrared luminescent agents used in this infrared absorbing ink and infrared luminescent ink are limited in use for preventing counterfeiting and are generally difficult to obtain.
Therefore, by heating the part with special printing as described above, extracting it with a solvent, or scraping it off, a special ink component is extracted and re-inked. There was a case of counterfeiting that made it genuine.

  In such cases, printed matter such as banknotes and gift certificates are considered to be less likely to be re-inked because the infrared absorbing or infrared emitting ink loses its value. . However, with anti-counterfeiting printing or opening seals used on vouchers and product packages that have already been used and lost value, there is a high possibility that they will be re-inked and reprinted on imitations for abuse.

Further, in the case of anti-counterfeit printing applied to precious metals used in a specific distribution system, the precious metal material itself is valuable without the anti-counterfeit printing, and can be sold outside the distribution system.
On the other hand, if the anti-counterfeit printing ink can be collected from the precious metal of the distribution system, the anti-counterfeit printing ink is applied to the precious metal counterfeit (plated product, colored glossy product, etc.). There was a problem of being traded at the value of.

JP 2005-246719 A Japanese Patent No. 2992651

  The present invention has been made in order to solve the above-described problems, and an object of the present invention is to provide a laminated display body that has a high anti-counterfeit effect and is difficult to reink ink for forgery prevention.

In order to achieve the above object, a laminated display according to claim 1 of the present invention is
On the substrate, a first resin layer containing an inorganic phosphor pigment that is excited by infrared rays and emits light in an infrared wavelength region, and a second resin layer that does not contain the inorganic phosphor pigment between the substrate and the first resin layer Are stacked in this order from the surface side.

The laminated display according to claim 2 of the present invention is
The thickness of the first resin layer is smaller than the thickness of the second resin layer.

The laminated display according to claim 3 of the present invention is
The content of the inorganic phosphor pigment contained in the first resin layer is from 5% by weight to 25% by weight with respect to the resin solid content of the layer.

The laminated display according to claim 4 of the present invention is
The content of the inorganic phosphor pigment contained in the first resin layer is from 15% by weight to 25% by weight with respect to the resin solid content of the layer.

A laminated display according to claim 5 of the present invention is
The thickness of the first resin layer is 1.5 μm or more and 3 μm or less, and the thickness of the second resin layer is 1.2 times or more of the thickness of the first resin layer.

The laminated display body according to claim 6 of the present invention is
The substrate is made of a noble metal having an uneven portion on the surface, and the first resin layer and the second resin layer are formed on the uneven portion.

A laminated display according to claim 7 of the present invention is
The hardness of the first resin layer is smaller than the hardness of the second resin layer.

A laminated display according to claim 8 of the present invention is
The first resin layer and the second resin layer mainly include a resin crosslinked by heat, light, or a curing agent.

A laminated display according to claim 9 of the present invention is
The first resin layer includes a pigment that is excited by infrared rays and emits infrared rays on a longer wavelength side.

According to the laminated display according to the present invention, by forming a latent image on a medium using an ink containing an inorganic phosphor pigment that emits light in the infrared, whether or not it is a counterfeit product by detecting this infrared light emission. An anti-counterfeit effect that enables discrimination is obtained.
Furthermore, even if a third party scrapes off the layer containing the inorganic phosphor pigment or tries to re-ink it by solvent extraction, the layer not containing this pigment is also mixed at the same time, so the component ratio of the pigment Is greatly reduced and infrared emission cannot be detected, so that forgery is impossible.

It is sectional drawing which shows the basic layer structure of the laminated display body of this invention. It is a top view which shows the structure of Example 1 of the laminated display body of this invention. It is sectional drawing which shows between AA of the laminated display body of FIG. It is a top view which shows the structure of Example 2 of the laminated display body of this invention. It is sectional drawing which shows between BB of the laminated display body of FIG.

  Hereinafter, embodiments of a multilayer display body according to the present invention will be described in detail with reference to the drawings.

FIG. 1 is a cross-sectional view showing a basic layer structure of a multilayer display body of the present invention.
In the multilayer display body 10, the second resin layer 13 and the first resin layer 12 are laminated on the substrate 11 in this order.
The substrate 11 is an anti-counterfeit medium, and is a base material for a medium that requires an anti-counterfeit effect. As a specific medium, it is used for a cash voucher, a product package, a noble metal product, or the like. Various materials are used as the main material of the substrate, for example, plastic, metal, ceramic, or a composite thereof.

  The main material of the first resin layer 12 is an inorganic fluorescent pigment that emits infrared rays and a binder resin as a binder. Although the details will be described later, the first resin layer 12 is provided in order to obtain an anti-counterfeit effect, and can use the inorganic fluorescent pigment as ink to form a latent image pattern that cannot be seen under visible light. The latent image can be observed by irradiating infrared rays with a specific device and performing visualization.

  Here, visualization means that a latent image pattern that emits light in the infrared wavelength region is detected using a dedicated device, visualized as an image, and displayed on a monitor screen so that a human can recognize the latent image pattern. Indicates that Since the latent image pattern cannot be recognized at all by the human naked eye, this is very effective as a means for preventing forgery.

Examples of the inorganic fluorescent pigment that emits infrared light (hereinafter referred to as “inorganic fluorescent pigment”) include, for example, vanadate, molybdate, tungstate, phosphate, etc., neodymium (Nd) and ytterbium (Yb ) Or the like doped with a rare earth element as an activator, or a material obtained by substituting part of neodymium or ytterbium with yttrium (Y) or lanthanum (La). Examples of the inorganic fluorescent pigment are given below.
Ca ₁₀ (PO ₄ ) ₆ F ₂ : Nd, Yb
Ca ₈ La ₂ (PO ₄ ) ₆ O ₂ : Nd, Yb
YAlO ₃ : Nd, Yb
Y ₃ Al ₅ O ₁₂ : Nd, Yb
(Y, La, Lu) PO ₄ : Nd, Yb
(Nd, Yb) P ₃ O ₉
(Nd, Yb) P ₅ O ₁₄
(Li, Na, K) (Nd, Yb) P ₄ O ₁₂
K ₃ (Nd, Yb) P ₂ O ₈
Na (Nd, Yb) (WO ₄ ) ₂
Na ₅ (Nd, Yb) (WO ₄ ) ₄
Na (Nd, Yb) (MoO ₄ ) ₂
Na ₅ (Nd, Yb) (MoO ₄ ) ₄
Na ₂ (Nd, Yb) Mg ₂ (VO ₄ ) ₃
(Al, Cr) ₃ (Nd, Yb) (BO ₃ ) ₄
Na ₅ (Nd, Yb) ((Si, Ge) O ₃ ) ₄
Na ₃ (Nd, Yb) (Si, Ge) ₂ O ₇
(Nd, Yb) MgAl ₁₁ O ₁₉
(Y, La, Nd, Yb) VO ₄

Salts of elements such as sodium, potassium and calcium are strongly alkaline, weak against water and acid, and easily decomposed. However, from the viewpoint of preventing reinking, which is the object of the present invention, when a third party tries to dissolve and remove the resin layer with hot water or acid for the purpose of producing counterfeit products, the inorganic fluorescent material that is an infrared light emitting agent is used. It is desirable that the functional pigment is decomposed.
Therefore, in the present invention, among the inorganic fluorescent pigments listed above, compounds having sodium, potassium or calcium salts are preferred.

The binder resin used for the first resin layer 12 is preferably one having a strong adhesive force and excellent wear resistance.
Examples of such binder resins include polyurethane resins, polyester resins, acrylic resins, polycarbonate resins, polyvinyl butyral resins, polystyrene resins, acrylic silicone resins, alkyd resins, vinyl chloride-vinyl acetate copolymer resins, ethylene-vinyl acetate. One or more binder resins selected from copolymers, ethyl acrylate resins, epoxy resins, phenoxy resins, or modified products thereof, or epoxy acrylate, polyester acrylate, polyether acrylate, urethane acrylate, acrylic alkylate, alkyd acrylate A polyvalent acryloyl group pendant type ultraviolet curable resin, etc. is used.

These resins are resins that are excellent in adhesive strength with a plastic substrate or a magnetic layer, have high mechanical strength, and do not absorb infrared excitation light.
In addition, a lubricant, a leveling agent, a dispersing agent, an adhesion imparting agent, or the like can be appropriately added as an additive to the first resin layer 12 depending on the application.

  The main material of the second resin layer 13 is a binder resin serving as a binder, and does not include a pigment that emits infrared light. However, a lubricant, a leveling agent, a dispersant, an adhesion imparting agent, or the like may be appropriately added as an additive depending on the application.

  The binder resin used for the second resin layer 13 may be the same as or different from the resin used for the first resin layer 12, but may be bonded to the substrate 11 or the first resin layer 12. It is preferable to select one having sufficient properties.

  In the multilayer display body 10 of the present invention, the second resin layer 13 is laminated between the first resin layer 12 and the substrate 11 and does not contain an inorganic fluorescent pigment that is an infrared light emitting agent. As a result, the forgery prevention effect can be enhanced, and the reason is as follows.

  For example, a third party obtains the laminated display body of the present invention for the purpose of producing a counterfeit product, scrapes the first resin layer 12 on the surface layer by mechanical means, or dissolves it with hot water, and reinks it. Consider the case of trying to make it.

At this time, if the thickness of the first resin layer 12 of the surface layer is sufficiently thin, the second resin layer 13 as the lower layer is also made of the same resin material, and therefore the second resin layer 13 is also scraped off simultaneously when trying to scrape off. Or when it melt | dissolves with hot water etc., the 2nd resin layer 13 will also melt | dissolve simultaneously.
Therefore, only the first resin layer 12 cannot be collected, and as a result, a mixture of the first resin layer 12 and the second resin layer 13 is collected.

And even if this is re-inked, the content rate of the infrared light-emitting agent component in the said mixture will become smaller than that in the original first resin layer 12.
If the content of the infrared light emitting component is small, sufficient infrared light emission intensity that can be detected by an infrared sensor cannot be obtained. For this reason, it is impossible to create a counterfeit product.

  In order to obtain the above effects, it is possible to make it difficult to scrape only the first resin layer by appropriately selecting the thicknesses of the first resin layer 12 and the second resin layer. According to the inventors' experimental investigation, the thickness of the first resin layer 12 is preferably in the range of 1.5 μm to 3 μm. At this time, the thickness of the second resin layer 13 is preferably about 1.2 times that of the first resin layer 12, that is, in the range of 1.8 μm to 3.6 μm.

  In this case, it is technically difficult to scrape off only the first resin layer 12, and even if the second resin layer 13 is scraped off at the same time. The rate will drop significantly.

  In particular, if the binder resin is a curable resin such as a thermosetting resin or an ultraviolet curable resin, the crosslinking density is high and generally has a property insoluble in a solvent. Since it becomes difficult to take, it is more preferable for the use of forgery prevention.

  Moreover, the hardness of the binder resin of each resin layer can be selected so that the hardness of the second resin layer 13 is larger than the hardness of the first resin layer. In this case, since the thickness of the first resin layer is thin and the hardness is small, even if only this layer is to be scraped off, the second resin layer is inevitably scraped off. The effect that the content rate of a component falls and sufficient infrared light emission intensity | strength cannot be obtained is acquired.

Furthermore, if the hardness of the second resin layer 13 is larger than the hardness of the substrate 11, a function of protecting the substrate 11, that is, the forgery prevention medium from scratches and wear can be added.
Since the hardness of the resin layer and the substrate is determined by the material, for example, the substrate may be made of hard plastic and the resin layer may be made of a material such as polyurethane resin, and other combinations can be appropriately selected. The hardness may be measured by using a general hardness measuring means, for example, measurement of Vickers hardness or Rockwell hardness.

  The above layer configuration is an example, and layers used for other purposes can be added. For example, a printing pattern layer for displaying information on the outermost surface layer or a protective layer against water resistance, chemical resistance, scratch resistance, etc. may be selected as appropriate.

Next, the example implemented based on this invention is demonstrated.
FIG. 2 is a plan view showing the configuration of Example 1 of the multilayer display body of the present invention.
In the multilayer display body 20, a first resin layer pattern 22 and a second resin layer pattern 23 having a pattern as shown in the figure are formed on a substrate 21. This is a pattern formed by processing each of the first resin layer 12 and the second resin layer 13 using the multilayer display body 10 having the basic configuration shown in FIG.

  In this embodiment, the pattern of each resin layer is formed by a printing method. However, it is not particularly limited to this method, and a known pattern forming means may be used, depending on the material of the resin layer and the characteristics of the substrate 21. Select an appropriate method.

FIG. 3 is an enlarged view showing the layer configuration of the cross-sectional portion along the dotted line AA in FIG.
On the board | substrate 21, the 1st resin layer pattern 22 and the 2nd resin layer pattern 23 are pattern-formed like a figure. Since the 1st resin layer pattern 22 contains the inorganic fluorescent pigment which is an infrared luminescent agent, when it irradiates with infrared rays, it will light-emit by the function of the contained infrared luminescent agent component. Since the light emission pattern is observed only with a special infrared observation device, it can be used as a forgery prevention means.

Next, FIG. 4 is a top view which shows the structure of Example 2 of the laminated display body of this invention.
A laminated display body 100 shown in FIG. 4 has a resin layer laminated region 106 in which a second resin layer pattern 103 and a first resin layer pattern 102 are laminated on a substrate 101 that is a medium for preventing forgery. .

  A first stamp 104 processed into a groove shape is formed in the region of the resin layer stacked region 106, and a second stamp 105 processed in the same groove shape is formed outside the region of the resin layer stacked region 106. Is formed.

  The first stamp 104 is obtained by forming a groove-like pattern on the surface of the substrate 101 by a known processing method such as engraving, embossing, or etching. Similarly, the second stamp 105 forms a groove-like pattern on the surface of the substrate 101 by a known method.

  Further, the region including the first stamp 104 is formed by laminating the second resin layer pattern 103 and the first resin layer pattern 102 to form a resin layer pattern region 106. Here, as a method for forming the pattern of each resin layer, a known method such as a printing method may be used. However, as a printing method for the engraved portion, screen printing, tampo printing, an inkjet method, or the like is optimal.

  The first resin layer pattern 102 includes an inorganic fluorescent pigment that is an infrared light emitting agent, and emits light by the action of the contained infrared light emitting component when irradiated with infrared rays. This can be used as a forgery prevention means.

FIG. 5 is an enlarged view showing the layer configuration of a cross-sectional portion along the dotted line BB of the multilayer display body 100 shown in FIG. The uneven portions in FIG. 5 are engraved portions, and correspond to the portion between the dotted line parts BB in the first engraving 104 in FIG.
In the concave portion of the marking, the first resin layer pattern 102 and the second resin layer pattern 103 are laminated along the bottom and side walls of the concave portion of the substrate, but the film thickness is sufficiently thinner than the width of the concave and convex portion. Even if the resin layer is laminated, the uneven portions remain without being filled.

  This embodiment is particularly suitable for the purpose of applying a forgery preventing means to products made of noble metals. In this case, noble metals are used for the substrate 101. The noble metal is, for example, gold, silver, platinum, palladium, rhodium, iridium, ruthenium, osmium, etc. Among them, gold, silver, platinum, etc., which are highly decorative and rare, have a large amount of product circulation.

  Conventionally, in such precious metal products, the surface of the precious metal is often stamped for quality certification. However, forgery is easy only with the stamp, and the effectiveness as anti-counterfeiting means is low. Therefore, the laminated display body of the present example can obtain a more excellent anti-counterfeiting effect by adopting the configuration shown in FIG. I made it.

  That is, after forming a mark in a desired region, the first resin layer pattern 102 and the second resin layer pattern 103 are further laminated thereon to provide the following advantages compared to the prior art. Obtained.

The first advantage is the improvement of the anti-counterfeiting effect. Even if only the first resin layer pattern 102 containing the infrared light emitting agent is to be scraped off, it is difficult to scrape to the concave portion due to the unevenness, and if it is to be scraped off, Even the noble metal of the substrate is damaged, and the value as a noble metal product is lowered, so that it is substantially impossible to scrape off.

  The second advantage is that adhesion is improved as a result of an increase in the surface area of adhesion between the noble metal of the substrate and the second resin layer pattern 103 due to the unevenness of the marking.

  Furthermore, the third advantage is that information can be displayed by engraving. The first resin layer pattern can be printed on the engraved part without printing the pattern. The pattern image of the stamp can be observed in the infrared region observation due to the difference in the local film thickness when the resin layer is applied in the uneven portion and the optical difference such as the infrared light reflectance in this portion, and it is displayed as the stamp. Information such as the quality and weight of precious metals is now available.

  In this embodiment, the first resin layer pattern 102 is laminated on the first stamp 104 by solid printing, but a pattern different from the first stamp 104 may be formed by the first resin layer.

  The laminated display according to the present invention is most suitable for applications that require advanced anti-counterfeiting means, and can be used as anti-counterfeiting means such as banknotes, ID cards, high-grade wrapping paper, or precious metals.

DESCRIPTION OF SYMBOLS 10 ... Laminated display body 11 ... Board | substrate 12 ... 1st resin layer 13 ... 2nd resin layer 20 ... Laminated display body 21 ... Board | substrate 22 ... 1st resin layer pattern 23 ... Second resin layer pattern 100 ... Laminated display 101 ... Substrate 102 ... First resin layer pattern 103 ... Second resin layer pattern 104 ... First stamp 105 ... First Double stamp 106 ... Resin layer pattern area

Claims (9)

A first resin layer containing an inorganic phosphor pigment that is excited by infrared rays and emits light in the infrared wavelength region and a second resin layer not containing the inorganic phosphor pigment are laminated on the substrate in this order from the surface side. A laminated display body characterized by comprising: The thickness of the first resin layer is smaller than the thickness of the second resin layer,
The laminated display body according to claim 1. The content of the inorganic phosphor pigment contained in the first resin layer is 5 wt% or more and 25 wt% or less based on the resin solid content of the layer,
The laminated display body according to claim 1 or 2. The content of the inorganic phosphor pigment contained in the first resin layer is 15 wt% or more and 25 wt% or less based on the resin solid content of the layer,
The laminated display body according to claim 1 or 2. The thickness of the first resin layer is 1.5 μm or more and 3 μm or less,
And the thickness of said 2nd resin layer is 1.2 times or more of the thickness of 1st resin layer, The laminated display body as described in any one of Claim 1 to 4 characterized by the above-mentioned. The substrate is made of a noble metal having an uneven portion on the surface,
The first resin layer and the second resin layer are formed on the uneven portion,
The multilayer display body as described in any one of Claim 1 to 5. The hardness of the first resin layer is smaller than the hardness of the second resin layer,
The multilayer display body according to any one of claims 1 to 6. The first resin layer and the second resin layer mainly include a resin crosslinked by heat, light, or a curing agent,
The multilayer display body according to any one of claims 1 to 7. The multilayer display body according to any one of claims 1 to 8, wherein the first resin layer includes a pigment that is excited by infrared rays and emits infrared rays having longer wavelengths.

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