JP5870506B2 - Anti-counterfeit sheet and anti-counterfeit medium - Google Patents

Description

  The present invention relates to a forgery prevention technique using fine particles.

  The anti-counterfeit technology for preventing counterfeiting of articles requires two aspects from its application. First, at first glance, it cannot be recognized that the article has anti-counterfeiting technology, and that the consumer who uses the article is genuine from the viewpoint of the safety of the article. It is easy to authenticate when confirming.

  Currently, anti-counterfeiting techniques that are widely used include a watermark technique and a hologram that can be visually checked for authenticity. These techniques have the advantage that authentication can be performed easily because they can be visually confirmed, but the development of a new anti-counterfeiting technique is desired because of the demand for further improvement of the anti-counterfeiting effect.

  Therefore, anti-counterfeiting technology that performs authenticity determination by observing using a simple magnifying instrument such as a loupe has attracted attention (Patent Documents 1 and 2). These techniques can exhibit a higher anti-counterfeiting effect than anti-counterfeiting techniques that can be visually confirmed. In addition, there is an advantage that identification can be easily performed without requiring a special device or the like for authenticity determination.

  A technique using fine particles called taggant particles (tracking additives) has been proposed as an anti-counterfeiting technique that requires a magnifying device when performing such authentication. In the anti-counterfeit medium using taggant particles, the position of the taggant particles varies depending on the individual, so that it is difficult to confirm the taggant particles themselves and it is difficult to duplicate them. Therefore, it is possible to exhibit an excellent anti-counterfeit effect, and it becomes possible to identify an individual.

  Taggant particles are known to have information that can be identified by magnifying and observing, for example, characters, symbols, marks, etc., special shapes, and special color information (Patent Document 3).

  However, there is a problem that the function of preventing forgery for an article that requires higher security may be insufficient. For example, when using fine particles made of metal or fine particles having a color, the fine particles are easily found due to a color difference between the color of the fine particles and the color of the article.

  In addition, when fine particles having color are mixed with ink to form ink, there is a problem that the color of the original ink changes due to the influence of a dye or the like contained in the fine particles. In addition, when ink-made fine particles are printed on the surface of a print medium such as paper or a card, there is a problem that the color of the fine particles and the print medium is different and the position of the fine particles is easily found. .

  As described above, if fine particles are easily found, the possibility of being imitated / replicated increases. Therefore, there is a demand for fine particles that cannot be found at first glance.

  Furthermore, when fine particles that have been converted to ink are printed on the surface of the medium, the fine particles are directed in an arbitrary direction. There is a problem that the displayed identification information cannot be recognized because the displayed portion does not always face the viewer.

JP 2008-230228 A JP 2009-193069 A JP 2001-288698 A

  This invention is made | formed in view of the said subject, and it aims at providing the fine particle which has the high anti-counterfeit function excellent in confidentiality.

  In order to solve the above problems, the present invention provides fine particles having identification information that can be observed by enlarging and that can be identified based on a shape, wherein the fine particles are transparent. Provided is a fine particle characterized by containing a resin material.

According to the present invention, since the fine particles have transparency, it is difficult to recognize the fine particles contained in the article, and the fine particles having excellent confidentiality can be obtained.
Further, when the fine particles having transparency are used in the ink, the original color of the ink is not affected. In addition, when the fine particles having transparency are fixed and fixed to a print medium, the fine particles are assimilated and integrated with the pattern or color displayed on the print medium. Fine particles having an excellent high anti-counterfeit function can be obtained. Further, since the fine particles have transparency, when fine particles having identification information in part are used, even if the portion having identification information in the fine particles does not face the viewer side. The identification information can be recognized.
Further, since the identification information can be observed by being enlarged, and the identification based on the shape is possible, the authenticity determination can be easily performed.

  The present invention provides an anti-counterfeit ink characterized by containing the fine particles. When the anti-counterfeit ink contains fine particles having transparency, an anti-counterfeit ink having a high anti-counterfeit function with excellent secrecy can be produced. Further, since the fine particles have transparency, the original color of the ink is not changed.

  The present invention provides an anti-counterfeit toner comprising the fine particles. When the anti-counterfeit toner contains fine particles having transparency, it becomes possible to produce an anti-counterfeit toner having a high anti-counterfeit function with excellent secrecy. Further, since the fine particles have transparency, the original color of the toner is not changed.

  The present invention provides an anti-counterfeit sheet having a fine particle-containing layer in which the fine particles are dispersed in a transparent resin. Thereby, it becomes possible to produce the forgery prevention sheet which has the high anti-counterfeit function which is excellent in secrecy.

  The present invention provides at least a base portion and a convex portion or a concave portion formed on the surface of the base portion, which can be observed by magnifying and has identification information that can be identified based on the shape. There is provided an anti-counterfeit sheet comprising an identification portion including one, the base portion and the identification portion being transparent and including a resin material. Thereby, it becomes possible to produce the forgery prevention sheet which has the high anti-counterfeit function which is excellent in secrecy.

  The present invention provides an anti-counterfeit medium comprising the fine particles or the anti-counterfeit sheet. As a result, it is possible to provide a high anti-counterfeit function with excellent confidentiality, and it is possible to produce an anti-counterfeit medium that can easily determine authenticity.

  According to the present invention, there is an effect that it is possible to provide fine particles having a high anti-counterfeit function excellent in confidentiality.

It is a schematic perspective view which shows an example of the fine particle of this invention. It is a schematic diagram which shows an example of the fine particle of this invention. It is a schematic diagram which shows the other example of the fine particle of this invention. It is a schematic diagram which shows the other example of the fine particle of this invention. It is a schematic sectional drawing which shows an example of the sheet for forgery prevention of this invention. It is a schematic sectional drawing which shows the other example of the sheet for forgery prevention of this invention. It is a schematic sectional drawing which shows the other example of the sheet for forgery prevention of this invention. It is a schematic sectional drawing which shows the other example of the sheet for forgery prevention of this invention. It is a schematic sectional drawing which shows the other example of the sheet for forgery prevention of this invention. It is a schematic sectional drawing which shows the other example of the sheet for forgery prevention of this invention. It is a schematic diagram which shows an example of the inspection method of the forgery prevention sheet of this invention. It is the schematic which shows the other example of the sheet for forgery prevention of this invention. It is the schematic which shows the other example of the sheet for forgery prevention of this invention. It is a schematic perspective view which shows the other example of the sheet for forgery prevention of this invention. It is a schematic perspective view which shows the other example of the sheet for forgery prevention of this invention. It is a schematic sectional drawing which shows the other example of the sheet for forgery prevention of this invention. It is a schematic diagram which shows an example of the forgery prevention medium of this invention. It is a schematic diagram which shows the other example of the forgery prevention medium of this invention.

  Hereinafter, the fine particles, the anti-counterfeit ink, the anti-counterfeit toner, the anti-counterfeit sheet and the anti-counterfeit medium of the present invention will be described in detail.

I. Fine particles The fine particles of the present invention are fine particles that can be observed by enlarging and have identification information that can be identified based on the shape, and the fine particles have transparency. And a resin material.

Since such fine particles of the present invention have transparency, it is difficult to recognize the fine particles contained in the article, and the fine particles can be made excellent in confidentiality.
Furthermore, since the fine particles have transparency, when used in ink, the fine color of the original ink is not affected. In addition, when the fine particles having transparency are fixed and fixed to a print medium, the pattern or color displayed on the print medium is not hidden by the fine particles, so that it is concealed. Fine particles having an excellent high anti-counterfeit function can be obtained.
Further, since the fine particles have transparency, when fine particles having identification information in part are used, even if the portion having identification information in the fine particles does not face the viewer side. The identification information can be recognized.
Further, since it is possible to observe by enlarging and identification based on the shape is possible, it is possible to easily determine the authenticity.
Hereinafter, each structure in the fine particle of this invention is demonstrated.

A. Transparency The fine particles of the present invention have transparency.
The transparency in the present invention is not particularly limited as long as the fine particles of the present invention have a transparency that can exhibit a desired function, and specifically, the total light transmittance in the visible region. Is preferably 10% or more. Especially, it is preferable that it is 30% or more, and it is especially preferable that it is 50% or more.
The total light transmittance is a value measured according to JIS K 7150.

B. Material The fine particles of the present invention include a resin material. Hereinafter, the material used for the fine particles of the present invention will be described.

1. Resin Material The resin material is not particularly limited as long as it can produce the above-described transparent fine particles. For example, epoxy acrylate resin, urethane acrylate resin, polyamic acid resin, polyimide Photo-curing resin materials such as resins, unsaturated polyester resins, acrylic urethane resins, epoxy-modified acrylic resins, epoxy-modified unsaturated polyester resins, alkyd resins, phenol resins, and other thermosetting resin materials, acrylic ester resins, acrylamide resins And thermoplastic resin materials such as nitrocellulose resin and polystyrene resin, and photosensitive resin materials. Further, as the photosensitive resin material, either a positive photosensitive resin or a negative photosensitive resin can be used. Among the materials described above, a photocurable resin material and a photosensitive resin material are preferable, and a photocurable resin material is particularly preferable. This is because by using the photocurable resin material, fine particles having identification information that can be identified based on the shape can be formed with high definition.

  The refractive index of the fine particles of the present invention varies depending on the type and blending amount of the material constituting the fine particles, and in the present invention, particularly if the fine particles can achieve a desired anti-counterfeit function. It is not limited. The refractive index of the fine particles of the present invention is appropriately adjusted according to the use of the fine particles.

  For example, when the fine particle-containing layer in which the fine particles of the present invention are dispersed in a transparent resin is formed, the identification information possessed by the fine particles can be visually recognized if the fine particles and the transparent resin have the same refractive index. Although it becomes impossible, identification information that can be identified based on the shape of the fine particles is less likely to be recognized when the difference in refractive index between the resin material of the fine particles and the transparent resin is smaller. Therefore, when it is desired to improve confidentiality, it is preferable that the difference in refractive index between the resin material of fine particles and the transparent resin is small. Specifically, the difference in refractive index between the resin material of fine particles and the transparent resin is preferably in the range of 0 to 0.1.

2. Functional material The resin material used in the present invention preferably contains a functional material. This is because the identification information other than the form can be easily given to the fine particles, so that the authenticity determination can be easily performed.
Examples of the functional material include an ultraviolet light emitting material, an infrared light emitting material, an infrared reflecting material, an infrared absorbing material, a quantum dot material, and a magnetic material. Among these, an ultraviolet light emitting material, an infrared light emitting material, an infrared reflecting material, an infrared absorbing material and the like are preferably used. This is because identification can be performed using a simple instrument, and identification by light emission, light reflection, and absorption is possible, so that authenticity determination is facilitated.
Furthermore, when the fine particle-containing layer in which the fine particles of the present invention are dispersed in a transparent resin, for example, is formed, since the fine particles contain a resin material, the difference in refractive index between the fine particles and the transparent resin is small. Then, the interface between the fine particles and the transparent resin becomes difficult to see, and it may be difficult to recognize the identification information of the fine particles. Even in such a case, the identification information can be recognized when the fine particles contain the functional material.
Hereinafter, each functional material will be described.

(A) Ultraviolet light emitting material As the ultraviolet light emitting material, a material that emits fluorescence by absorbing ultraviolet light can be used. As the ultraviolet light-emitting material, either a material that emits light by absorption in a short wavelength region (about 200 nm to 300 nm) or a material that emits light by absorption in a long wavelength region (about 300 nm to 400 nm) can be used. This ultraviolet light emitting material is excited by ultraviolet light and has a spectrum peak emitted when returning to a lower energy level in the wavelength range such as blue, green, red, etc., and should be selected appropriately according to the purpose. Can do. Specific examples include Ca ₂ B ₅ O ₉ Cl: Eu ²⁺ , CaWO ₄ , ZnO: Zn, Zn ₂ SiO ₄ : Mn, Y ₂ O ₂ S: Eu, ZnS: Ag, YVO ₄ : Eu, Y _2. O ₃ : Eu, Gd ₂ O ₂ S: Tb, La ₂ O ₂ S: Tb, Y ₃ Al ₅ O ₁₂ : Ce, Sr ₅ (PO ₄ ) ₃ Cl: Eu, 3 (Ba, Mg) O · 8Al ₂ O ₃ : Eu, Zn ₂ GeO ₄ : Mn, Y (P, V) O ₄ : Eu, 0.5MgF ₂ · 3.5MgO · GeO ₂ : Mn, ZnS: Cu, ZnS: Mn and the like. These may be used alone or in combination of two or more. Note that the composition of the ultraviolet light-emitting material is expressed by connecting the main component and the activator or the light emission center with “:”.

  The particle size of such an ultraviolet light emitting material is preferably 500 nm or less, and more preferably 100 nm or less. It is because the transparency which the said fine particle has can be maintained when it is made to contain in the fine particle of this invention if it is in the said range.

  The content of the ultraviolet light emitting material in the fine particles is not particularly limited as long as it can be distinguished by light emission and the fine particles of the present invention have the above-described transparency. Specifically, It can be about 1% by mass to 50% by mass.

(B) Infrared light emitting material As the infrared light emitting material used in the present invention, a material that emits fluorescence by absorbing infrared light can be used. The infrared light emitting material is excited by infrared light (about 800 nm to 1200 nm) and emits visible light (about 400 nm to 800 nm), and can be appropriately selected depending on the purpose. Specific examples include YF ₃ : Yb + Er, YF ₃ : Yb + Tm, BaFCl: Yb + Er, and the like. In addition, the said infrared luminescent material has described the composition by connecting a main component, an activator, or a luminescent center by ":".

  The particle size of such an infrared light emitting material is preferably 500 nm or less, and more preferably 100 nm or less. It is because the transparency which the said fine particle has can be maintained when it is made to contain in the fine particle of this invention if it is in the said range.

  The content of the infrared light emitting material in the fine particles is not particularly limited as long as it can be distinguished by light emission and the fine particles of the present invention have the above-described transparency. Specifically, It can be about 1% by mass to 50% by mass.

(C) Infrared reflective material As the infrared reflective material, a material having wavelength selective reflectivity with respect to infrared light can be used, and examples thereof include a multilayer structure material, an infrared reflective pigment, and a liquid crystal material having a cholesteric structure. it can. The wavelength of infrared rays reflected by the infrared reflecting material is not particularly limited, but is usually 800 nm to 2500 nm.

Examples of the multilayer structure material include a multilayer structure material composed of a layer having an infrared reflection surface (infrared reflection layer) formed at intervals that reflect infrared rays. The multilayer structure material reflects infrared light having a specific wavelength by Bragg reflection of each layer (infrared reflective layer).
Specifically, the infrared reflective layer can be formed using a multilayer liquid crystal material having a fixed cholesteric structure such as a crosslinked cholesteric liquid crystal.

As the infrared reflective pigment, powder and particles of an infrared reflective material are used, and any of inorganic pigments and organic pigments can be used. Examples of inorganic pigments include composite metal oxides such as titanium oxide (TiO ₂ ), zinc oxide, zinc sulfide, lead white, antimony oxide, zirconium oxide, indium tin oxide (ITO), and antimony-doped tin oxide (ATO). , Metals such as aluminum, gold, and copper. Further, as an inorganic pigment, a transparent support material such as natural or synthetic mica, another foliar silicate, glass flake, flaky silicon dioxide or aluminum oxide described in JP-A-2004-4840, and a metal oxide An interference pigment made of a coating can also be used. On the other hand, examples of the organic pigment include pigments described in JP-A-2005-330466 and JP-A-2002-249676, and examples thereof include azo, anthraquinone, phthalocyanine, perinone / perylene, Indigo / thioindigo, dioxazine, quinacridone, isoindolinone, isoindoline, diketopyrrolopyrrole, azomethine, and azomethine azo organic dyes can be used.

  Examples of the liquid crystal material having a cholesteric structure (so-called cholesteric liquid crystal material) include a chiral nematic liquid crystal material obtained by mixing a nematic liquid crystal with a chiral agent, or a polymer cholesteric liquid crystal material.

  The particle size of such an infrared reflecting material is preferably 500 nm or less, and more preferably 100 nm or less. It is because the transparency which the said fine particle has can be maintained when it is made to contain in the fine particle of this invention if it is in the said range.

  The content of the infrared reflecting material in the fine particles is not particularly limited as long as it can be identified by infrared reflection and the fine particles of the present invention have the above-described transparency. In this case, the content may be about 0.1% by mass to 50% by mass.

(D) Infrared absorbing material The infrared absorbing material is not particularly limited as long as it is a material that can absorb infrared rays (800 nm to 1100 nm). Among them, an infrared absorbing material that absorbs a wavelength range of 800 nm to 1100 nm and has a sufficient light transmittance in the visible light range, that is, in a wavelength range of 380 nm to 780 nm is preferable.

  Examples of infrared absorbing materials include polymethine compounds, cyanine compounds, phthalocyanine compounds, naphthalocyanine compounds, naphthoquinone compounds, anthraquinone compounds, dithiol compounds, immonium compounds, diimonium compounds, aminium compounds, Pyryllium compounds, cerium compounds, squarylium compounds, copper complexes, nickel complexes, dithiol metal complexes, benzenedithiol metal complex anions disclosed in JP 2007-163644 and cyanine dye cations Organic infrared absorbing materials such as counterion conjugates, and composite tungsten oxide, tin oxide, indium oxide, magnesium oxide, titanium oxide, chromium oxide, dioxide oxide disclosed in JP-A-2006-154516 Koniumu, nickel oxide, aluminum oxide, zinc oxide, iron oxide, ammonium, lead oxide, bismuth oxide, lanthanum oxide, tungsten oxide, and inorganic infrared absorbing material such as indium tin oxide (ITO). An infrared absorption material can be used individually or in combination of 2 or more types. The “system compound” refers to an anthraquinone derivative in the case of an anthraquinone compound, for example.

  The infrared absorbing material is preferably selected as appropriate depending on the type of resin used. For example, when a photocurable resin material or a photosensitive resin material is used, an inorganic near-infrared absorbing material such as composite tungsten oxide can be suitably used as the infrared absorbing material.

  The particle size of such an infrared absorbing material is preferably 500 nm or less, and more preferably 100 nm or less. It is because the transparency which the said fine particle has can be maintained when it is made to contain in the fine particle of this invention if it is in the said range.

  The content of the infrared absorbing material in the fine particles is not particularly limited as long as it can be identified by absorption of infrared rays, but specifically, it is in the range of 0.1% by mass to 10% by mass. It is preferable. This is because, if the content of the infrared absorbing material is within the above range, a sufficient infrared absorbing function can be exhibited, and a sufficient amount of visible light can be transmitted to obtain the above-described transparent fine particles. .

(E) Quantum dot material Quantum dot material is a nanometer-sized fine particle of semiconductor, and due to the quantum confinement effect (quantum size effect) in which electrons and excitons are confined in a small crystal of nanometer size, It exhibits specific optical and electrical properties and is also called a semiconductor nanoparticle or a semiconductor nanocrystal.
The quantum dot material used in the present invention is not particularly limited as long as it is a nanometer-sized fine particle of a semiconductor and produces a quantum confinement effect (quantum size effect). For example, there are semiconductor fine particles whose emission color is regulated by their own particle size and semiconductor fine particles having a dopant.

  The quantum dot material may be composed of a single semiconductor compound or may be composed of two or more kinds of semiconductor compounds. For example, a core composed of a semiconductor compound and a shell composed of a semiconductor compound different from the core. It may have a core-shell type structure. As a typical example, a core made of CdSe, a ZnS shell provided around the core, and a protective material (also referred to as a capping material) provided around the core can be exemplified. This quantum dot material has a different emission color depending on its particle size. For example, in the case of a quantum dot composed only of a core made of CdSe, the particle size is 2.3 nm, 3.0 nm, 3.8 nm. The peak wavelengths of the fluorescence spectrum at 4.6 nm are 528 nm, 570 nm, 592 nm, and 637 nm.

  Specifically, the core material of the quantum dot material includes MgS, MgSe, MgTe, CaS, CaSe, CaTe, SrS, SrSe, SrTe, BaS, BaSe, BaTe, ZnS, ZnSe, ZnTe, CdS, CdSe, CdTe. II-VI semiconductor compounds such as HgS, HgSe and HgTe, AlN, AlP, AlAs, AlSb, GaAs, GaP, GaN, GaSb, InN, InAs, InP, InSb, TiN, TiP, TiAs and TiSb Examples thereof include semiconductor compounds such as III-V group semiconductor compounds, group IV semiconductors such as Si, Ge and Pb, or semiconductor crystals containing semiconductors. Alternatively, a semiconductor crystal including a semiconductor compound containing three or more elements such as InGaP can be used.

Further, as a quantum dot material composed of semiconductor fine particles having a dopant, a semiconductor crystal obtained by doping the semiconductor compound with a rare earth metal cation or a transition metal cation such as Eu ³⁺ , Tb ³⁺ , Ag ⁺ , or Cu ⁺ is used. Can also be used. Among these, semiconductor crystals such as CdS, CdSe, CdTe, InP, and InGaP are preferable from the viewpoints of ease of fabrication, controllability of the particle size for obtaining light emission in the visible region, and fluorescence quantum yield.

When a core-shell type quantum dot material is used, the semiconductor constituting the shell is a material having a higher band gap than the semiconductor compound forming the core so that excitons are confined in the core. Luminous efficiency can be increased.
Examples of the core-shell structure (core / shell) having such a bandgap relationship include CdSe / ZnS, CdSe / ZnSe, CdSe / CdS, CdTe / CdS, InP / ZnS, Gap / ZnS, Si / ZnS, Examples include InN / GaN, InP / CdSSe, InP / ZnSeTe, InGaP / ZnSe, InGaP / ZnS, Si / AlP, InP / ZnSTe, InGaP / ZnSTe, and InGaP / ZnSSe.

  The size of the quantum dot may be appropriately controlled depending on the material constituting the quantum dot so that light having a desired wavelength can be obtained. As the particle size of the quantum dot decreases, the energy band gap increases. That is, as the crystal size decreases, the light emission of the quantum dots shifts to the blue side, that is, to the high energy side. Therefore, by changing the size of the quantum dot, the emission wavelength can be adjusted over the entire wavelength range of the ultraviolet region, the visible region, and the infrared region.

  In general, the particle size (diameter) of the quantum dots is preferably in the range of 0.5 nm to 20 nm, and particularly preferably in the range of 1 nm to 10 nm. The narrower the quantum dot size distribution, the clearer the emission color.

  The shape of the quantum dot is not particularly limited, and may be, for example, a spherical shape, a rod shape, a disk shape, or other shapes. When the particle dot is not spherical, the particle size of the quantum dot can be a true spherical value having the same volume.

  Information such as the particle size, shape, and dispersion state of the quantum dots can be obtained by a transmission electron microscope (TEM). The crystal structure and particle size of the quantum dots can be known by X-ray crystal diffraction (XRD). Furthermore, the information regarding the particle size and surface of a quantum dot can also be obtained by an ultraviolet-visible (UV-Vis) absorption spectrum.

  The content of the quantum dot material in the fine particles is not particularly limited as long as it can be distinguished by light emission and the fine particles of the present invention have the above-described transparency. Specifically, , About 0.1% by mass to about 50% by mass.

(F) Magnetic material Magnetic materials include nuclear magnetic resonance (NMR), nuclear quadrupole resonance (NQR), electron spin resonance (ESR), ferromagnetic resonance, antiferromagnetic resonance, ferrimagnetic resonance, domain wall resonance, spin wave. Those exhibiting magnetic resonance such as resonance and spin echo resonance can be used.

Since the resonance frequency is determined by the magnetic rotation ratio γ, which is an intrinsic parameter of the nucleus, and the magnetic field strength of the external magnetic field, the presence of the fine particles of the present invention can be achieved by selecting the resonance frequency at which the magnetic material exhibits magnetic resonance. Can be recognized, and authenticity determination can be performed.
For example, when fine particles containing a magnetic material and fine particles not containing a magnetic material are irradiated with electromagnetic waves having a frequency at which the magnetic material exhibits nuclear magnetic resonance, resonance absorption occurs in the fine particles containing the magnetic material, resulting in magnetic Resonance absorption does not occur in fine particles that do not contain a material. Therefore, the existence of fine particles can be recognized by observing this resonance absorption, and authenticity determination can be performed. Further, in the obtained NMR spectrum, the position, intensity, half-value width, shape, etc. of the signal differ depending on the structure and energy state of the substance, so that it can be identified by the type of magnetic material used.

  As the magnetic material, powder or particles of magnetic material are used. Examples of the magnetic material include fine particles exhibiting magnetic resonance described in JP-A-2005-309418.

  The particle size of such a magnetic material is preferably 500 nm or less, and more preferably 100 nm or less. This is because within the above range, the transparency of the fine particles can be maintained when contained in the fine particles of the present invention.

  The content of the magnetic material in the fine particles is not particularly limited as long as it can be identified by magnetic resonance and the fine particles of the present invention have the above-described transparency. It is preferably about 1% by mass to 30% by mass, and particularly preferably about 5% by mass to 20% by mass. If the content of the magnetic material is less than the above range, identification may be difficult, and if it is more than the above range, it may be difficult to form a three-dimensional shape on the surface of the fine particles. is there.

(G) Others In addition to the functional materials described above, other functional materials may be contained in the resin material used in the present invention depending on the application.

C. Identification Information Next, identification information in the present invention will be described. The identification information of the present invention can be observed by enlarging and can be identified based on the shape.
In the present invention, “being able to be observed by enlarging” means that it is difficult to observe visually and can be observed when enlarging using an enlarging means. In the present invention, “identification information that can be identified based on shape” refers to information having a unique shape, and does not include information consisting only of intangible information such as color. To do.

The type of such identification information is not limited as long as it can be identified based on the shape, and examples include the outer shape of the fine particles and the uneven shape formed on the surface of the fine particles.
Hereinafter, each identification information will be described.

1. External Shape The external shape of the fine particles of the present invention is not particularly limited as long as it can be identified by magnifying and observing. The external shape of the fine particles of the present invention may be a planar solid shape or a curved solid shape.
Hereinafter, description will be made separately for each shape.

(A) Planar three-dimensional shape The planar three-dimensional shape indicates a shape in which the front surface and the back surface are configured by a plane, or a shape configured by only a plane.

1 (a), (b), (c), and (d) are schematic perspective views showing an example of a planar solid shape of the fine particles of the present invention.
A fine particle 1 shown in FIG. 1A has a planar solid shape 2 (column) that can be identified by magnifying and observing an enlarged surface 5 and a back surface 6. Moreover, the fine particle 1 shown in FIG.1 (b) has the plane solid shape 2 (square pillar) which can identify by enlarging and observing that the surface 5 and the back surface 6 are planes. .
A fine particle 1 shown in FIG. 1C has a planar solid shape 2 (stereoscopic shape of D, N, and P) that has a front surface 5 and a back surface 6 that are flat and can be identified by magnifying and observing. Have.
A fine particle 1 shown in FIG. 1D is composed of only a flat surface, and has a planar solid shape 2 (square pyramid) that can be identified by magnifying and observing.

Thus, in the present invention, the planar solid shape 2 is a shape in which the front surface 5 and the back surface 6 are flat as shown in FIGS. 1A, 1B, 1C, and 1D, and only the flat surface. Including the shape composed of
The planar solid shape is not particularly limited as long as it is a shape as described above, and is appropriately determined according to the application. For example, a columnar body and a cone as shown in FIG. 1 and a truncated cone and the like (not shown) are exemplified.

  As a shape when the fine particles having such a planar solid shape are viewed in plan, for example, a geometric shape such as a circle, a polygon, a person, an animal, a plant, food, a tool, a vehicle, a building, a landscape, Arbitrary shapes, such as a character, a number, a code | symbol, a symbol, etc., can be mentioned. Specifically, it is a circle in FIG. 1 (a), a polygon in FIGS. 1 (b) and 1 (d), and a character in FIG. 1 (c).

(B) Curved solid shape Curved solid shape refers to a shape in which either the front surface or the back surface has a curved surface.

2A and 2B are schematic views showing an example of the fine particles of the present invention. FIG. 2A is a top view, and FIG. 2B is a cross-sectional view taken along the line AA in FIG. FIG. The fine particles 1 shown in FIGS. 2A and 2B have a front surface 5 and a back surface 6, the surface 5 has a curved surface, and a curved solid shape 3 that can be identified by magnifying and observing. (Three-dimensional shape of teapot).
2C and 2D are schematic views showing other examples of the fine particles of the present invention. FIG. 2C is a perspective view, and FIG. 2D is a side view. The fine particles 1 shown in FIGS. 2C and 2D have a front surface 5 and a back surface 6, the surface 5 has a curved surface, and a curved solid shape 3 that can be identified by magnifying and observing. (Three-dimensional shape of D · N · P).

Thus, in the present invention, the curved three-dimensional shape 3 is a shape in which either the front surface 5 or the back surface 6 (the front surface 5 in FIG. 2) has a curved surface, as shown in FIGS. 2 (b) and 2 (d). Point to. When the front surface 5 has a curved surface, the back surface 6 is usually a flat surface.
The curved three-dimensional shape is not particularly limited as long as the shape is as described above, and is appropriately determined according to the application.

  Examples of the shape of the fine particles 1 having such a curved three-dimensional shape 3 when viewed in plan include geometric shapes such as circles and polygons, people, animals, plants, food, tools, vehicles, buildings, and landscapes. Or it can be made into arbitrary shapes, such as a symbol, such as a character, a number, a code | symbol, and a mark. Specifically, the teapot (tool) is shown in FIGS. 2A and 2B, and characters are shown in FIGS. 2C and 2D.

(C) Size The size of the outer shape is not particularly limited as long as it can be identified by magnifying and observing, but is preferably 300 μm or less, and is preferably 250 μm or less. It is more preferable. This is because if the outer shape is too large, it can be visually observed and the forgery prevention effect may be reduced. The size of the outer shape is preferably observable using a simple magnifying glass such as a magnifying glass, specifically 50 μm or more. This is because if it is possible to observe with a simple instrument such as a simple magnifier, the authenticity can be easily determined. In addition, when the size of the outer shape is 50 μm or less, it is difficult to determine the authenticity with a simple magnifying device, but it can be identified by using an advanced magnifying device such as a microscope. Becomes difficult and the effect of preventing forgery is enhanced. Therefore, the lower limit of the size of the outer shape is appropriately selected according to the use of the fine particles of the present invention, such as when concealment and difficulty of imitation are more important than ease of authentication.

(D) Light diffusion characteristics The three-dimensional curved surface shape formed by the fine particles of the present invention can be confirmed by measuring the light diffusion characteristics. The planar solid shape has one normal direction, while the curved solid shape has a normal direction different depending on the position. Therefore, the brightness of the reflected light differs between the planar solid shape and the curved solid shape. Further, the change in brightness of reflected light when the incident angle of light is changed is different between the planar solid shape and the curved solid shape.

The curved solid shape can be confirmed by a destructive or non-destructive inspection method.
Examples of the destructive inspection method include a method of confirming by cutting fine particles with a cutter, a razor, a microtome, etc., and magnifying and observing with a loupe or a microscope.
Non-destructive inspection methods include a method of confirming by performing contact-type or non-contact-type shape measurement. The contact-type shape measurement includes, for example, a technique using a stylus-type shape measuring instrument that measures a shape by bringing a needle into contact with a fine particle and moving it. Non-contact type shape measurement uses, for example, white light with less coherence as a light source and an iso-optical interferometer such as a Mirau type or a Michelson type, and the optical path position (interference) of each CCD pixel corresponding to the measurement surface. There is a method using a scanning white interferometer that measures the shape by a method of finding the position where the intensity is maximum by scanning the interferometer objective lens vertically.

  The light diffusing characteristic in the outer shape is not particularly limited as long as a desired anti-counterfeit effect can be obtained, and is appropriately adjusted according to the application. Hereinafter, the description will be divided into two applications.

  When the fine particles of the present invention are used on the surface of a resin-made medium, the fine particles having a planar solid shape as identification information are preferable. Since the surface roughness of the surface of the resin medium and the surface (plane) of the fine particles having a planar solid shape are similar, the light diffusion characteristics are similar and the light reflection / diffusion range is almost equal. It becomes difficult to confirm the fine particles themselves. Therefore, an excellent anti-counterfeit effect can be obtained.

  On the other hand, when the fine particles of the present invention are used on the surface of a paper medium, the fine particles preferably have a curved three-dimensional shape as identification information. Paper has a large surface roughness, but if the fine particles have a curved three-dimensional shape, the light reflection / diffusion range is widened, so that the light diffusion characteristics of the paper can be approached, and the confirmation of the fine particles themselves can be made. Can be difficult. Therefore, an excellent anti-counterfeit effect can be obtained.

2. Concave and convex shape The concave and convex shape in the fine particle of the present invention is formed on the surface of the fine particle and has at least one of a concave portion and a convex portion.

3A and 3B are schematic views showing other examples of the fine particles of the present invention. FIG. 3A is a top view, and FIG. 3B is a cross-sectional view taken along line BB in FIG. It is line sectional drawing. The fine particles 1 shown in FIGS. 3A and 3B have concave portions 4 (stars) that can be identified by magnifying and observing on the surface 5, and further have a planar solid shape 2. Yes.
4 (a) and 4 (b) are schematic views showing other examples of the fine particles of the present invention, FIG. 4 (a) is a top view, and FIG. 4 (b) is C in FIG. 4 (a). FIG. The fine particles 1 shown in FIGS. 4 (a) and 4 (b) have a concave portion 4 (TEA characters) that can be identified by magnifying and observing the surface 5, and a curved three-dimensional shape 3 (teapot). (Three-dimensional shape).

In addition, when the fine particles having the uneven shape of the present invention are inked and printed on the surface of the medium, the fine particles are directed in an arbitrary direction, but the fine particles have transparency, so the uneven shape in the fine particles. Even if the portion where the is formed does not face the viewer, the identification information by the displayed uneven shape can be recognized.
Hereinafter, the uneven shape will be described.

(A) Shape The uneven shape of the fine particle of the present invention is not particularly limited as long as it can be formed on the surface of the fine particle and can be identified by magnifying and observing.

For example, the concavo-convex shape may be a columnar shape as shown in FIGS. 3A and 3B and FIGS. 4A and 4B, and may be a cone shape although not shown.
Examples of the shape of the concavo-convex shape in plan view include a polygon such as a triangle and a quadrangle, a geometric shape such as a circle and an ellipse, and symbols such as letters, numbers, codes, and marks.
The concave / convex shape may be a concave portion 4 as shown in FIGS. 3A and 3B and FIGS. 4A and 4B, or may be a convex portion although not shown. In addition, the recessed part may penetrate.
In the concavo-convex shape, the lower bottom surface of the concave portion and the upper bottom surface of the convex portion may be flat or curved.

(B) Size The size of such a concavo-convex shape is not particularly limited as long as it can be identified by magnifying and observing, but it can be observed with a simple magnifier such as a loupe. Specifically, since it can be the same as the size of the outer shape described above, description thereof is omitted here.

The height of the convex portion or the depth of the concave portion constituting the concavo-convex shape is not particularly limited as long as it can be identified based on the concavo-convex shape described above, but it is fine with excellent confidentiality. From the viewpoint of obtaining particles, the height of the convex portion and the depth of the concave portion are preferably smaller.
Specifically, the height of the convex portion and the depth of the concave portion differ depending on the size of the outer shape, and are preferably 1/10 or less with respect to the size of the outer shape. / 30 or less is preferable.
If the height of the convex part or the depth of the concave part is in the above range, it is possible to obtain fine particles that are difficult to recognize the concave / convex shape and excellent in secrecy. On the other hand, when the height of the convex part of the fine particles or the depth of the concave part is extremely smaller than the above range, it becomes difficult to give the fine particles desired identification information by the convex part or concave part, In addition, when the height of the convex portion of the fine particle or the depth of the concave portion is extremely larger than the above range, the fine particle itself can be easily found when the fine particle is used on the surface of the article. This is because it is easy to recognize the uneven shape as the identification information, and thus there is a risk of forgery or duplication.

(C) Light diffusion characteristics The uneven shape differs in brightness of reflected light depending on whether it is a convex part or a concave part. Further, in the concavo-convex shape, the change in brightness of reflected light when the incident angle of light is changed is different between the case where the lower bottom surface of the concave portion and the upper bottom surface of the convex portion are flat surfaces.
The light diffusing property in the uneven shape is not particularly limited as long as a desired anti-counterfeiting effect can be obtained, and is appropriately adjusted according to the application.

  The method for measuring the light diffusing characteristic can be the same as the light diffusing characteristic of the outer shape described above, and the description thereof is omitted here.

D. Fine particle The particle diameter of the fine particle of the present invention is not particularly limited as long as it can be observed by enlarging, but is specifically preferably 300 μm or less, and more preferably 250 μm or less. . This is because if the particle size of the fine particles is too large, it can be visually observed, and the position of the fine particles is specified when used in the anti-counterfeit medium, so that the anti-counterfeit effect may be reduced. Further, the particle diameter of the fine particles is preferably observable using a simple magnifier such as a magnifying glass, specifically 50 μm or more. This is because if it is possible to observe with a simple instrument such as a simple magnifier, the authenticity can be easily determined. If the particle size of the fine particles is 50 μm or less, it is difficult to judge the authenticity using a simple magnifying device, but it can be identified by using an advanced magnifying device such as a microscope, and the particle size of the fine particles can be reduced. In this case, manufacturing becomes difficult and the effect of preventing forgery is enhanced. Therefore, the lower limit of the particle size of the fine particles is appropriately selected according to the use of the fine particles of the present invention, such as when concealment and imitation difficulty are more important than ease of authentication.

  The particle size is generally used to indicate the particle size of the particle, and is a value measured by a laser method in the present invention. The laser method is a method of measuring an average particle size, a particle size distribution, and the like by dispersing particles in a solvent and thinning and calculating scattered light obtained by applying a laser beam to the dispersion solvent. The particle size is a value measured using a particle size analyzer Microtrac UPA Model-9230 manufactured by Leeds & Northrup as a particle size measuring device by a laser method.

The thickness of the fine particles of the present invention is not particularly limited as long as it can provide an anti-counterfeit effect that makes it difficult to find fine particles at first glance, From the viewpoint of obtaining excellent fine particles, a thinner one is preferable. Specifically, it is preferably in the range of 0.1 μm to 5 μm, and more preferably in the range of 1 μm to 3 μm.
The thickness of the fine particles mentioned above refers to the thickness of the fine particles in a cross section substantially perpendicular to the back surface of the fine particles. For example, the thickness H of the fine particles as shown in FIG.
Here, the “substantially vertical cross section” indicates that the angle formed by the substantially vertical cross section and the back surface of the fine particles is within a range of 90 ° ± 10 °.

In the present invention, it is more preferable that the particle size (L) of the fine particles and the thickness (H) of the fine particles satisfy L / 50 <H <L / 10. If the thickness is too small relative to the particle size, the fine particles will be easily broken, whereas if the thickness is too thick relative to the particle size, it is not the front and back surfaces having the identification information of the fine particles and has no identification information. This is because the side surfaces (thickness portions) of the fine particles face the surface of the anti-counterfeit medium, that is, the observer side, which may make identification difficult.
The particle size (L) of the fine particles refers to the particle size of the fine particles in plan view from the surface side of the fine particles. For example, as shown to Fig.4 (a), when the fine particle 1 has the major axis L1 and the minor axis L2, let the major axis L1 of a microparticle be a particle size of a microparticle. Further, the thickness (H) of the fine particles refers to the thickness of the fine particles in a cross section substantially perpendicular to the back surface of the fine particles, as described above. For example, it refers to the thickness H of fine particles as shown in FIG.
The particle size (L) and thickness (H) of the fine particles can be measured by the destructive or non-destructive inspection method described above.

E. Applications The fine particles of the present invention are suitable for anti-counterfeiting applications, such as gold vouchers, gift cards, credit cards, ID cards, passports, driver's licenses, brand products, automobile parts, precision equipment parts, home appliances, cosmetics, pharmaceuticals. , Foods, OA supplies, sports equipment, CDs, DVDs, software, tobacco, liquor, etc.

II. Anti-counterfeit Ink The anti-counterfeit ink in the invention contains the fine particles. When the anti-counterfeit ink has fine particles having transparency, it becomes possible to produce an anti-counterfeit ink having a high anti-counterfeit function excellent in confidentiality. Further, since the fine particles have transparency, the original color of the ink is not changed.
Hereinafter, each configuration in the anti-counterfeit ink of the present invention will be described.

A. Fine Particles The fine particles used in the present invention can be the same as those described in detail in the section “I. Fine Particles”, and will not be described here.

  As the fine particles, one type of fine particles may be used, or two or more types of fine particles may be used. For example, one type of fine particles having the same outer shape may be used, or two or more types of fine particles having different outer shapes may be used. One kind of fine particles having the same outer shape and the same uneven shape may be used, or two or more kinds of fine particles having the same outer shape and different uneven shapes may be used. Good. When two or more kinds of fine particles are used, the fine particles can be used in combination so as to express a predetermined meaning.

  The content of the fine particles in the anti-counterfeit ink is not particularly limited as long as the anti-counterfeit ink of the present invention is used as an anti-counterfeit medium, and authenticity can be determined with fine particles. It can be about 0.01 mass% to 50 mass%.

B. Transparent resin component The anti-counterfeit ink of the present invention is usually one in which the above-mentioned fine particles are dispersed in a transparent resin component.

The light transmittance of the transparent resin component used in the present invention is such that fine particles can be observed when a fine particle-containing layer in which fine particles are dispersed in a transparent resin is formed using the anti-counterfeit ink of the present invention. If it is, it will not specifically limit, However, When a transparent resin component is formed into a film with predetermined thickness, it is preferable that the total light transmittance in a visible region is 10% or more.
In addition, the said total light transmittance is the value measured based on JISK7105.

  The transparent resin component is not particularly limited as long as it satisfies the above light transmittance, and for example, any of a photocurable resin component, a thermosetting resin component, and a thermoplastic resin component can be used. Among these, curable resin components such as a photocurable resin component and a thermosetting resin component are preferable, and a photocurable resin component is particularly preferable. By using a photocurable resin component, it becomes possible to apply the anti-counterfeit ink of the present invention to a support having low heat resistance, and the options for use are widened. In addition, when the fine particle-containing layer in which fine particles are dispersed in a transparent resin is formed using the anti-counterfeit ink of the present invention, production efficiency can be improved.

C. Functional material The anti-counterfeit ink of the present invention contains functional materials such as an ultraviolet light emitting material, an infrared light emitting material, an infrared reflecting material, an infrared absorbing material, and a quantum dot material in addition to the fine particles and the transparent resin component. You may do it.

  For example, when the anti-counterfeiting ink contains an ultraviolet light emitting material or an infrared light emitting material, and the fine particles do not contain an ultraviolet light emitting material or an infrared light emitting material, the position of the fine particles is specified by the presence or absence of light emission. This makes it possible to easily determine the authenticity and improve the anti-counterfeit effect. In addition, when the anti-counterfeit ink contains an ultraviolet light emitting material or an infrared light emitting material, and the fine particles also contain an ultraviolet light emitting material or an infrared light emitting material, the position of the fine particles is specified by the wavelength of light emission. This makes it possible to easily determine the authenticity and improve the anti-counterfeit effect.

  When the anti-counterfeit ink contains an infrared reflecting material or an infrared absorbing material, and the fine particles do not contain an infrared reflecting material or an infrared absorbing material, the position of the fine particles depends on the presence or absence of infrared absorption or reflection. This makes it possible to determine the authenticity and to improve the effect of preventing forgery. Further, when the anti-counterfeit ink contains an infrared reflecting material or an infrared absorbing material, and the fine particles also contain an infrared reflecting material or an infrared absorbing material, the fine particles may be absorbed depending on the wavelength of infrared rays to be absorbed or reflected. This makes it possible to specify the position of the image, facilitates authenticity determination, and improves the anti-counterfeit effect.

  When the anti-counterfeit ink contains a quantum dot material, and the fine particles do not contain a quantum dot material, the position of the fine particles can be specified by the presence or absence of light emission, and authenticity determination is easy. In addition, it is possible to improve the forgery prevention effect. In addition, when the anti-counterfeit ink contains a quantum dot material and the fine particles also contain a quantum dot material, the position of the fine particles can be specified by the wavelength of light emission, and authenticity determination can be performed. It becomes easy and it becomes possible to improve the forgery prevention effect.

  The functional material can be the same as that described in the above-mentioned section “I. Fine particles”, and thus the description thereof is omitted here.

  The content of the ultraviolet light emitting material in the anti-counterfeit ink is not particularly limited as long as it can be identified by light emission, and can be about 1% by mass to 50% by mass.

  The content of the infrared light emitting material in the anti-counterfeit ink is not particularly limited as long as it can be identified by light emission, and can be about 1% by mass to 50% by mass.

  The content of the infrared reflective material in the anti-counterfeit ink is not particularly limited as long as identification by infrared reflection is possible, and can be about 0.1% by mass to 50% by mass.

  The content of the infrared absorbing material in the anti-counterfeit ink is not particularly limited as long as it can be identified by absorbing infrared rays, but is preferably in the range of 0.1% by mass to 10% by mass. . This is because if the content of the infrared absorbing material is within the above range, a sufficient infrared absorbing function can be exhibited and a sufficient amount of visible light can be transmitted.

  The content of the quantum dot material in the anti-counterfeit ink is not particularly limited as long as it can be identified by light emission, and can be about 0.1% by mass to 50% by mass.

D. Solvent The anti-counterfeit ink of the present invention may contain a solvent. The solvent is not particularly limited as long as the fine particles and the transparent resin component are dispersed, and is appropriately selected according to the application method of the anti-counterfeit ink. Moreover, a solvent may be used individually by 1 type and may be used in mixture of 2 or more types.
For example, when used as an ink for gravure printing, toluene, ethyl acetate, methyl ethyl ketone, isopropyl alcohol and the like can be mentioned. When used as offset printing ink or silk screen printing ink, high-boiling petroleum solvents (hydrocarbons having 15 or more carbon atoms (C15 or more)) can be used.

  The solid content concentration of the anti-counterfeit ink of the present invention is not particularly limited as long as the anti-counterfeit ink can be applied to the anti-counterfeit medium, and can be about 20% by mass to 85% by mass.

III. Anti-Counterfeit Toner The anti-counterfeit toner according to the invention contains the fine particles. When the anti-counterfeit toner has fine particles having transparency, it becomes possible to produce an anti-counterfeit toner having a high anti-counterfeit function with excellent secrecy. Further, since the fine particles have transparency, the original color of the toner is not changed.

The anti-counterfeit toner of the present invention only needs to contain the above fine particles, and may be either a dry toner or a wet toner, and can be a general composition. The anti-counterfeit toner of the present invention can contain, for example, a main resin, a secondary resin, a colorant, a charge control agent, a fluidity control agent and the like.
The main resin is not particularly limited as long as it has light transmittance and the above fine particles are dispersed. The light transmittance of the main resin can be the same as the light transmittance of the transparent resin component in the forgery prevention ink described above. Styrene-acrylic and polyester are mainly used as the main resin. Polypropylene, polyethylene, and WAXs are used as the secondary resin. The main resin and auxiliary resin may be used alone or in combination of two or more.
Carbon, cyan pigment, magenta pigment, yellow pigment, etc. are used as the colorant. Charge control agents include positive and negative systems, and include those containing metals, resin systems, and quaternary ammonium salts. Silica or the like is used as the flow control agent.

  The fine particles can be the same as the fine particles in the above-described anti-counterfeit ink, and thus description thereof is omitted here.

  The anti-counterfeit toner of the present invention may further contain a functional material such as an ultraviolet light emitting material, an infrared light emitting material, an infrared reflecting material, an infrared absorbing material, or a quantum dot material. The functional material can be the same as the functional material in the forgery prevention ink described above.

IV. Anti-counterfeit Sheet The anti-counterfeit sheet of the present invention has two aspects.
Hereinafter, each aspect will be described.

A. 1st aspect The anti-counterfeit sheet | seat in this aspect has a fine particle content layer by which the said fine particle was disperse | distributed in transparent resin.

The anti-counterfeit sheet according to this aspect will be described with reference to the drawings.
FIG. 5 is a schematic cross-sectional view showing an example of the anti-counterfeit sheet according to this embodiment. The anti-counterfeit sheet 10 shown in FIG. 5 includes a fine particle-containing layer 12 in which predetermined fine particles 1 are dispersed in a transparent resin 11.

  In this aspect, since it has the fine particle content layer containing the fine particles described above, it is possible to obtain a forgery prevention medium having an excellent anti-counterfeit effect by using the anti-counterfeit sheet of this aspect. In addition, when the fine particles have a curved solid shape or an uneven shape as identification information, the fine particles have transparency even if the curved solid shape or uneven shape of the curved solid shape does not face the observer side. Thus, it is possible to recognize a curved surface having a three-dimensional curved surface or an uneven shape.

  FIG. 6 is a schematic sectional view showing another example of the anti-counterfeit sheet according to this embodiment. In the anti-counterfeit sheet 10 shown in FIG. 6, a release layer 13, an adhesive layer 14, and a fine particle-containing layer 12 in which predetermined fine particles 1 are dispersed in a transparent resin 11 are sequentially laminated.

  FIG. 7 is a schematic cross-sectional view showing another example of the anti-counterfeit sheet according to this embodiment. The anti-counterfeit sheet 10 shown in FIG. 7 has a base material 15 and a fine particle-containing layer 12 formed on the base material 15 in which predetermined fine particles 1 are dispersed in a transparent resin 11. An adhesive layer 14 and a release layer 13 are sequentially laminated on the containing layer 12 side.

  FIG. 8 is a schematic cross-sectional view showing another example of the anti-counterfeit sheet according to this embodiment. The anti-counterfeit sheet 10 shown in FIG. 8 is formed on a base material 15, a fine particle-containing layer 12 formed on the base material 15, in which predetermined fine particles 1 are dispersed in a transparent resin 11, and a fine particle-containing layer 12. The adhesive layer 14 and the release layer 13 are laminated in this order on the substrate 15 side.

  FIG. 9 is a schematic cross-sectional view showing another example of the anti-counterfeit sheet according to this embodiment. In the anti-counterfeit sheet 10 shown in FIG. 9, a release layer 13, an adhesive layer 14, a hologram layer 17, and a fine particle-containing layer 12 in which predetermined fine particles 1 are dispersed in a transparent resin 11 are sequentially laminated. Has been.

  FIG. 10 is a schematic sectional view showing another example of the anti-counterfeit sheet according to this embodiment. The anti-counterfeit sheet 10 shown in FIG. 10 includes a base material 15, a fine particle-containing layer 12 formed on the base material 15, in which predetermined fine particles 1 are dispersed in a transparent resin 11, and a fine particle-containing layer 12. It has a hard coat layer 16 formed thereon, and a hologram layer 17, an adhesive layer 14, and a release layer 13 are laminated in this order on the substrate 15 side.

Thus, the anti-counterfeit sheet according to this aspect may have other configurations in addition to the fine particle-containing layer.
Hereinafter, each structure in the anti-counterfeit sheet according to this embodiment will be described.

1. Fine particle-containing layer The fine particle-containing layer in this embodiment is one in which the above-mentioned fine particles are dispersed in a transparent resin.
The fine particles can be the same as the contents described in the above section “I. Fine particles”, and thus the description thereof is omitted here.

  As the fine particles, one type of fine particles may be used, or two or more types of fine particles may be used. For example, one type of fine particles having the same outer shape may be used, or two or more types of fine particles having different outer shapes may be used. One kind of fine particles having the same outer shape and the same uneven shape may be used, or two or more kinds of fine particles having the same outer shape and different uneven shapes may be used. Good. When two or more kinds of fine particles are used, the fine particles can be used in combination so as to express a predetermined meaning.

The light transmittance of the transparent resin used in this embodiment is not particularly limited as long as the fine particles in the fine particle-containing layer can be observed, but when the layer made of the transparent resin is formed with the same thickness as the fine particle-containing layer In addition, the total light transmittance in the visible region is preferably 10% or more.
In addition, the said total light transmittance is the value measured based on JISK7105.

The transparent resin is not particularly limited as long as it satisfies the above-described light transmittance. For example, any of a photocurable resin, a thermosetting resin, and a thermoplastic resin can be used. Among them, a curable resin such as a photocurable resin or a thermosetting resin is preferable, and a photocurable resin is particularly preferable. For example, as shown in FIGS. 7, 8, and 10, when the fine particle-containing layer 12 is formed on the base material 15, a base material having low heat resistance is also used by using a photocurable resin. This is because it is possible to do so and the options for use are expanded. Moreover, it is because the production efficiency of the anti-counterfeit sheet can be improved.
The transparent resin can be obtained by solidifying the transparent resin component described in the above section “II. Anti-counterfeiting ink”.

The content of the fine particles in the fine particle-containing layer is not particularly limited as long as the authenticity determination by the fine particles is possible when the anti-counterfeit sheet according to this aspect is used as an anti-counterfeit medium. It is preferable that at least one fine particle is contained per 1 cm ^{2 of the} particle-containing layer.

  In addition, when the fine particle-containing layer is formed on the substrate, the fine particle-containing layer may be formed on the whole surface of the substrate or may be formed in a pattern. When the pattern shape of the fine particle-containing layer is a shape that represents a predetermined meaning, the fine particles can be used as hidden information, and the forgery prevention effect can be enhanced.

The film thickness of the fine particle-containing layer is not particularly limited as long as it is possible to determine the authenticity by the fine particles when the anti-counterfeit sheet of this embodiment is used as an anti-counterfeit medium. Is appropriately selected according to the layer structure of the sheet for use and the type of transparent resin contained in the fine particle-containing layer. For example, as shown in FIGS. 7, 8, and 10, when the fine particle-containing layer 12 is formed on the base material 15, the film thickness of the fine particle-containing layer 12 may be relatively thin. On the other hand, as illustrated in FIG. 5, when the fine particle-containing layer 12 is formed alone, the fine particle-containing layer is preferably relatively thick from the viewpoint of self-supporting property. Moreover, when the transparent resin contained in a fine particle content layer is curable resin, it is preferable that the film thickness of a fine particle content layer is comparatively thin from a viewpoint of suppressing a crack.
Specifically, the film thickness of the fine particle-containing layer can be about 0.1 μm to 500 μm, and is preferably in the range of 1 μm to 100 μm.

Examples of the method for forming the fine particle-containing layer include a method in which the forgery prevention ink described above is applied and solidified. For example, as shown in FIGS. 7, 8, and 10, when the fine particle-containing layer 12 is formed on the base material 15, the anti-counterfeit ink is applied on the base material 15 and solidified. The fine particle-containing layer 12 can be formed.
Further, as illustrated in FIG. 5, when the fine particle-containing layer 12 is formed alone, the anti-counterfeit ink is applied on the substrate and solidified, and then the fine particle-containing layer 12 is removed from the substrate. By peeling, the fine particle-containing layer 12 can be obtained alone. The substrate used at this time may or may not have light transparency, and for example, a glass substrate, a resin substrate, or the like can be used.

Any method can be used as a method of applying the anti-counterfeit ink.
Further, the solidification method of the anti-counterfeit ink is appropriately selected according to the type of the transparent resin. In the case of a curable resin, a curing method using light or heat is used. In the case of a thermoplastic resin, a cooling method is used.

2. Base Material In this aspect, the fine particle-containing layer 12 may be formed on the base material 15 as illustrated in FIGS. 7, 8, and 10. This is because the strength of the anti-counterfeit sheet of this embodiment can be increased and can be easily handled. Among these, when the transparent resin contained in the fine particle-containing layer is a curable resin, the fine particle-containing layer is preferably relatively thin from the viewpoint of suppressing cracking of the fine particle-containing layer. It is preferable that a fine particle-containing layer is formed. In addition, when the anti-counterfeit sheet of this aspect is applied to an anti-counterfeit medium, as illustrated in FIG. 7, the base material 15 is disposed so as to be on the surface side of the fine particle-containing layer 12. Can also protect the fine particle-containing layer with the substrate. In the case of the layer structure illustrated in FIG. 8, an opaque base material can also be used.

The base material used in this embodiment may or may not have optical transparency, and is appropriately selected depending on the formation position of the base material. When the anti-counterfeit sheet of this aspect is applied to an anti-counterfeit medium, as illustrated in FIG. 7, the base material 15 is disposed on the surface side of the fine particle-containing layer 12, As illustrated in FIG. 10, when the base material 15 is disposed on the surface side of the hologram layer 17, the base material preferably has light transmittance.
On the other hand, when the anti-counterfeit sheet of this aspect is applied to an anti-counterfeit medium, as illustrated in FIG. 8, when the base material 15 is disposed so as to be on the back side from the fine particle-containing layer 12. The base material may or may not have optical transparency.

  When the substrate has light transmittance, the light transmittance is not particularly limited as long as the fine particles in the fine particle-containing layer can be observed, but the total light transmittance in the visible region is 10% or more. Is preferred.

  Moreover, it is preferable that a base material has flexibility. This is because the anti-counterfeit sheet according to this aspect can be applied to various forms of anti-counterfeit media.

  As such a base material, a general resin base material can be used. Examples thereof include resin base materials such as polyethylene terephthalate, polyvinyl chloride, polycarbonate, polypropylene, polyethylene, polystyrene, polyarylate, triacetyl cellulose, diacetyl cellulose, polymethyl methacrylate, polyimide, and polyamide.

The surface of the substrate is preferably subjected to an easy adhesion treatment in order to improve the adhesion with the fine particle-containing layer. The easy adhesion treatment is not particularly limited as long as the fine particle-containing layer and the substrate can be adhered, for example, physical treatment such as plasma treatment, corona discharge treatment, glow discharge treatment, flame treatment, or Examples thereof include chemical treatment using chromic acid, a silane coupling agent, a primer agent, and the like.
Among these, chemical treatment using a primer agent is preferable. In any case, the primer agent is suitable for treatment at the time of production of the substrate and for treatment of the surface of the substrate after production. A commercially available substrate can be used as the substrate treated with the primer agent. In addition, the primer agent for treating the surface of the substrate after production may be any one that can be in close contact with the anti-counterfeit ink.

  The thickness of the base material is appropriately selected according to the use and type of the anti-counterfeit sheet of the present invention, and can be set to about 1 μm to 800 μm, preferably in the range of 10 μm to 50 μm. .

3. Adhesive layer In this aspect, the adhesive layer 14 may be laminated | stacked on the fine particle content layer 12, as illustrated in FIGS. This is because the anti-counterfeit sheet according to this aspect can be attached via the adhesive layer.

  When the fine particle-containing layer is formed on the substrate, the adhesive layer may be laminated on the substrate side, or may be laminated on the fine particle-containing layer side. When a hard coat layer to be described later is formed on the fine particle-containing layer, an adhesive layer is disposed on the surface opposite to the hard coat layer. Moreover, when the fine particle content layer and the hologram layer are laminated | stacked, the adhesion layer is arrange | positioned at the hologram layer side.

  The material of the pressure-sensitive adhesive layer is not particularly limited as long as the anti-counterfeit sheet of the present invention can be attached via the pressure-sensitive adhesive layer. For example, thermoplastic, thermosetting, photo-curing, and elastomeric materials can be used. Any of them can be used, and is appropriately selected according to the use and type of the anti-counterfeit sheet. When the anti-counterfeit sheet is used as a transfer foil, an adhesive layer having heat sealability is used.

The film thickness of the pressure-sensitive adhesive layer is not particularly limited as long as the anti-counterfeit sheet of the present invention can be attached via the pressure-sensitive adhesive layer, and can be, for example, about 1 μm to 100 μm.
A known method can be used as a method for forming the adhesive layer.

4). Peeling layer In this aspect, the adhesive layer 14 and the peeling layer 13 may be laminated | stacked in order on the fine particle content layer 12, so that it may illustrate in FIGS. It is because handling of the anti-counterfeit sheet of this embodiment is facilitated by laminating the adhesive layer and the release layer.
The anti-counterfeit sheet of this embodiment is used by peeling off the release layer when applied to an anti-counterfeit medium.

  The release layer is not particularly limited as long as it has releasability. For example, a general resin substrate can be used.

5. Hard Coat Layer In this embodiment, as illustrated in FIGS. 8 and 10, the hard coat layer 16 may be formed on the fine particle-containing layer 12. This is because the fine particle-containing layer can be protected by the hard coat layer.
When the anti-counterfeit sheet of this embodiment is applied to the anti-counterfeit medium, the hard coat layer is such that the hard coat layer 16 is on the surface side of the fine particle-containing layer 12 as illustrated in FIGS. Placed in.

  The hard coat layer is light transmissive. The light transmittance of the hard coat layer is not particularly limited as long as fine particles in the fine particle-containing layer can be observed, but the total light transmittance in the visible region is preferably 10% or more, and more preferably 50% or more. It is preferable that it is especially 80% or more.

  The material of the hard coat layer is not particularly limited as long as it satisfies the above light transmittance and can protect the fine particle-containing layer, and for example, a photocurable resin can be used.

The film thickness of the hard coat layer is not particularly limited as long as the fine particle-containing layer can be protected, and can be, for example, about 1 μm to 100 μm.
As a method for forming the hard coat layer, a known method can be used.

6). Hologram Layer In this embodiment, as illustrated in FIGS. 9 and 10, a hologram layer 17 may be laminated on the fine particle-containing layer 12. This is because the hologram layer can enhance the forgery prevention effect.

The type of the hologram layer is not particularly limited, and may be a relief hologram layer or a volume hologram layer. The relief hologram layer is excellent in productivity, while the volume hologram layer is excellent in the forgery prevention effect.
A known hologram layer can be used.

  The hologram layer is arranged so that the hologram layer 17 is on the back side of the fine particle-containing layer 12 as illustrated in FIGS. 9 and 10 when the anti-counterfeit sheet of this aspect is applied to the anti-counterfeit medium. Is done. Thereby, a fine particle content layer can be utilized as a protective layer of a hologram layer.

7). Anti-counterfeit Sheet The anti-counterfeit sheet according to this aspect may be a single sheet or a long sheet.

  In addition, the shape of the anti-counterfeit sheet according to this aspect is not particularly limited, and may be a rectangle, a polygon, a circle, an ellipse, or any other shape. When the shape of the anti-counterfeit sheet of the present invention is a shape that represents a predetermined meaning, fine particles can be used as hidden information.

As the method for inspecting the anti-counterfeit sheet according to this aspect, as illustrated in FIG. 11, there is a method in which the anti-counterfeit sheet 10 is irradiated with light by the LED illumination 21 and an image is acquired by the camera (line sensor) 22. be able to. In FIG. 11, the LED illumination 21 is disposed on the opposite side of the camera 22 with respect to the anti-counterfeit sheet 10 and the transmitted light is observed. You may arrange | position LED illumination on the same side and observe reflected light.
In the anti-counterfeit sheet inspection apparatus, the position of fine particles can be mapped, stored in a database, and collated.
In the inspection, if there is a region that does not contain fine particles in the fine particle-containing layer, a laser marking device is used to mark the region that does not contain fine particles, and the anti-counterfeit sheet is You may exclude when making it into a shape.

  In the fine particle-containing layer in this embodiment, the fine particles 1 are dispersed in the transparent resin 11 as shown in FIG. When anti-counterfeiting is attempted in this way, the anti-counterfeiting effect that the fine particles cannot be found at first glance can be imparted by the fine particles being dispersed in the transparent resin, It may be difficult to identify the fine particles dispersed in the transparent resin based on the shape. In such a case, by using a resin material having a refractive index different from the refractive index of the transparent resin for the fine particles, the fine particles can be identified based on the shape while maintaining confidentiality.

B. Second aspect The anti-counterfeit sheet according to the present aspect is formed on the surface of the base part and the surface of the base part, and can be observed by enlarging and can be identified based on the shape. And a discriminating portion having at least one of a convex portion or a concave portion having the above-mentioned, the base portion and the discriminating portion are transparent and include a resin material.
According to this aspect, it is possible to predefine the number and position of the identification parts formed on the base part having a certain area. Therefore, by controlling the identification information to a higher degree, the anti-counterfeit sheet can be easily confirmed and the anti-counterfeit medium having an excellent anti-counterfeit effect can be produced.

The anti-counterfeit sheet according to this aspect will be described with reference to the drawings. 12 (a) and 12 (b) are schematic views showing an example of the anti-counterfeit sheet according to the present embodiment, FIG. 12 (a) is a perspective view, and FIG. 12 (b) is FIG. 12 (a). It is the DD sectional view taken on the line. As illustrated in FIG. 12, the anti-counterfeit sheet 10 of this aspect includes a base portion 31 and a plurality of convex portions 32 a that are formed on the surface of the base portion 31 and have a planar solid shape 2 (square prism) as identification information. And an identification unit 32 provided.
13 (a) and 13 (b) are schematic views showing another example of the anti-counterfeit sheet according to this embodiment, FIG. 13 (a) is a perspective view, and FIG. 13 (b) is shown in FIG. It is the EE sectional view taken on the line of a). As illustrated in FIG. 13, the anti-counterfeit sheet 10 according to this aspect includes a base portion 31 and a plurality of concave portions 32 b that are formed on the surface of the base portion 31 and have a planar solid shape 2 (square prism shape) as identification information. And an identification unit 32.

  In this aspect, the convex portion or the concave portion constituting the identification portion has identification information that can be observed by enlarging and can be identified based on the shape, and has the same identification information as the fine particles described above. Therefore, the anti-counterfeit sheet according to this aspect can produce an anti-counterfeit medium having an excellent anti-counterfeit effect.

1. Identification part The identification part of this aspect is formed on the surface of the base part, can be observed by magnifying, and has at least a convex part or a concave part having identification information that can be identified based on the shape One is provided. Moreover, the identification part has transparency and includes a resin material.
Hereinafter, each structure in an identification part is demonstrated.

(A) Transparency The transparency of the identification part in the present embodiment can be the same as that described in the section “I. Fine particles A. Transparency”, and thus the description thereof is omitted here.

(B) Identification information The identification information in this aspect is not particularly limited as long as it can be observed by enlarging and can be identified based on the shape.

The type of the identification information is not limited as long as it can be identified based on the shape, and examples thereof include an outer shape of the convex portion or the concave portion and an uneven shape formed on the surface of the convex portion or the concave portion.
The outer shape and the concavo-convex shape are the same as the contents described in the above-mentioned section “I. Fine Particles C. Identification Information”, and thus description thereof is omitted here.

One type or two or more types of convex portions or concave portions having identification information may be used, and are appropriately selected according to the use of the anti-counterfeit sheet.
Specifically, in FIG. 14, the identification unit 32 includes two types of convex portions 32 a, that is, a convex portion 32 a having a planar solid shape 2 (square column) and a convex portion 32 a having a planar solid shape 2 (column). .
Furthermore, in FIG. 15, the identification part 32 is provided with two types, the convex part 32a which has the planar solid shape 2 (square prism), and the recessed part 32b which has the planar solid shape 2 (square prism).

(C) Convex part or recessed part An identification part is provided with at least one of the convex part or recessed part which has identification information. The identification part may have a convex part 32a as shown in FIG. 12, may have a concave part 32b as shown in FIG. 13, and has a convex part 32a and a concave part 32b as shown in FIG. You may do it.

  The size of the convex portion or the concave portion is not particularly limited as long as it can be observed by enlarging the identification information of the convex portion or the concave portion. Specifically, the size of the convex portion or the concave portion is preferably 300 μm or less, and more preferably 250 μm or less. This is because if the convex portion or the concave portion is too large, it can be visually observed and the forgery prevention effect may be reduced. Moreover, it is preferable that the size of a convex part or a recessed part is observable using simple expansion tools, such as a magnifying glass, specifically, it is preferable that it is 50 micrometers or more. This is because if it is possible to observe with a simple magnifying device, the authenticity can be easily determined. Further, if the convex portion or the concave portion is too small, it becomes difficult for the convex portion or the concave portion to have desired identification information, or observation with a simple magnifier is difficult, and it is necessary to use a more advanced magnifier. This is because the determination may be complicated.

  As the height of the convex portion or the depth of the concave portion, the convex portion or the concave portion can be formed on the surface of the base portion, and the convex portion or the concave portion can have the identification information. There is no particular limitation as long as the height of the convex portion or the depth of the concave portion can provide an anti-counterfeit effect that is difficult to find. The height of the convex part and the depth of the concave part are appropriately adjusted depending on the size of the convex part and the concave part, but in particular, from the viewpoint of obtaining a forgery-preventing sheet excellent in secrecy, it may be smaller. preferable. Specifically, it is preferably 1/10 or less, more preferably 1/30 or less, with respect to the size of the convex part and the concave part.

  On the other hand, considering the ease of forming the convex portion or the concave portion, the size of the convex portion or the concave portion (u), the height of the convex portion (x), or the depth of the concave portion (y) is x / u ≧ 1 respectively. / 100 or y / u ≧ 1/100, preferably x / u ≧ 1/30 or y / u ≧ 1/30, more preferably x / u ≧ 1/20 or y / u ≧ 1/20 In particular, it is preferable that x / u ≧ 1/10 or y / u ≧ 1/10.

In addition, the height of a convex part is a convex part from the surface of the part in which the convex part 32a of the forgery prevention sheet 10 is not formed so that it may illustrate in FIG.12 (b), FIG.16 (a), (c). It refers to the distance x to the top of 32a.
Further, as illustrated in FIGS. 13 (b), 16 (b), and (d), the depth of the recess is determined from the surface of the portion where the recess 32b of the anti-counterfeit sheet 10 is not formed to the bottom of the recess 32b. To the distance y.
The height (x) of the convex portion or the depth (y) of the concave portion can be measured by the destructive or non-destructive inspection method described above.
The size (u) of the convex portion or concave portion is the maximum distance in plan view of the convex portion or concave portion. For example, when the shape in plan view is the shape shown in FIG. 4A, the distance L1 is indicated.
The size (u) of the convex portion or the concave portion can be measured by the destructive or nondestructive inspection method described above.

In this embodiment, there may be one convex portion or concave portion, or a plurality of convex portions or concave portions.
The number of convex portions or concave portions of the identification portion is not particularly limited as long as it is 1 or more, and is appropriately selected depending on the use of the anti-counterfeit medium in which the anti-counterfeit sheet is used. It is preferably within the range of 10 to 1,000,000,000, more preferably within the range of 100 to 1,000,000.
When the number of convex portions or concave portions included in the identification portion is less than the above range, it may be difficult to identify the positions of the convex portions or concave portions or to recognize the identification information itself included in the convex portions or concave portions. . In addition, about the number of a convex part or a recessed part, it can select suitably by the use of the sheet for forgery prevention of this aspect.

  The arrangement of the convex part or the concave part in the identification part is not particularly limited as long as the convex part or the concave part as the identification information can be recognized, and may be arranged so as to have regularity. May be arranged.

(D) Material Since the resin material used for the identification portion in this embodiment can be the same as that described in the section “I. Fine Particles B. Material”, the description here is omitted. .

(E) Others The identification part in this aspect is not particularly limited as long as it can be observed by enlarging the identification information of each convex part or concave part of the identification part with a simple instrument. It may be formed on a part of the surface of the prevention sheet or may be formed on the entire surface of the forgery prevention sheet.

  The method for forming the identification part of this aspect is not particularly limited as long as it is a manufacturing method that can form a desired identification part on the surface of the base part. A transfer part having a shape fitting with the identification information is formed to produce an original plate, and a resin layer is formed. Subsequently, the identification information of the identification part is formed on the resin layer surface by bringing the resin layer surface and the transfer part of the original plate into close contact with each other. Examples include a method of solidifying a resin layer to which identification information is shaped and peeling an original from a cured resin layer to form an identification portion.

2. Base part The base part in this aspect has the identification part mentioned above on the surface.
The base portion has transparency and includes a resin material.

As the thickness of the base portion in this aspect, the above-described identification portion can be formed on the surface of the base portion, and the thickness is such that the anti-counterfeit sheet of this aspect can be used as a desired anti-counterfeit medium. Although not particularly limited as long as it is present, specifically, it is preferably in the range of 1 μm to 800 μm, and more preferably in the range of 10 μm to 50 μm. If the thickness of the base is too thick, it may be difficult to process the anti-counterfeit sheet, or the anti-counterfeit medium may not be used.
In addition, as thickness of the base part in this aspect, the thickness z of the part in which the identification part 32 of the anti-counterfeit sheet 10 is not formed is illustrated as illustrated in FIGS. 12 (b) and 13 (b). It is.

  The transparency of the base portion and the resin material in the present embodiment can be the same as those described in the section “I. Fine particles”, and thus the description thereof is omitted here.

  As long as the identification part is formed on the surface of the base part, for example, the base part and the identification part may be formed integrally, or the base part and the identification part may be formed separately. In particular, it is more preferable that the base portion and the identification portion are integrally formed. This is because the anti-counterfeit sheet of this embodiment can be produced by a simple method.

3. Others The anti-counterfeit sheet of this aspect is not particularly limited as long as it has the above-described identification part and base part, and has the same structure as the structure other than the fine particle-containing layer shown in the first aspect. It can be appropriately selected and used.

When the anti-counterfeit sheet according to this aspect is fixed and fixed to the surface of the article to prevent forgery, identification based on the shape is possible.
When the anti-counterfeit sheet according to this aspect is used on the surface of the resin medium, the anti-counterfeit sheet according to this aspect can be easily obtained if the difference in refractive index between the identification part and the base part and the resin medium is small. A high anti-counterfeiting function that is not found and has excellent confidentiality can be realized.

  The anti-counterfeit sheet according to this aspect may be a single sheet or may be long like the anti-counterfeit sheet according to the first aspect.

C. Application The anti-counterfeit sheet of the present invention can be used as it is as a label or as a transfer foil. In addition, when the anti-counterfeit sheet has a hologram layer, it can also be used as a hologram label or a hologram transfer foil. Furthermore, the anti-counterfeit sheet can also be used as a laminate film on the anti-counterfeit medium.
Since the anti-counterfeit sheet itself can be light transmissive, it can be applied to various anti-counterfeit media.

Furthermore, when applying the anti-counterfeit sheet of the present invention to an anti-counterfeit medium, the anti-counterfeit sheet may be fixed to the surface of the anti-counterfeit medium, and the anti-counterfeit medium is composed of a plurality of layers. The anti-counterfeit sheet may be embedded in the anti-counterfeit medium, and when the anti-counterfeit medium is made of paper, the anti-counterfeit sheet may be cut into a thin strip and embedded in paper. When the anti-counterfeit sheet is fixed to the surface of the anti-counterfeit medium, the anti-counterfeit sheet may be attached as it is, or may be transferred by performing a transfer foil process. An example of the transfer method is a thermal transfer method.
The anti-counterfeit medium will be described in the section “V. Anti-counterfeit medium” described later, and will not be described here.

V. Anti-Counterfeit Medium The anti-counterfeit medium in the present invention has the fine particles or the anti-counterfeit sheet.

  17A and 17B are schematic views showing an example of the forgery prevention medium of the present invention. FIG. 17A is a top view, and FIG. 17B is a FF line in FIG. It is sectional drawing. In the anti-counterfeit medium 40 shown in FIGS. 17A and 17B, the fine particle-containing layer 12 in which the fine particles 1 described above are dispersed in the transparent resin 11 is formed on the support 41.

  18A to 18C are schematic views showing other examples of the anti-counterfeit medium of the present invention. FIG. 18A is a top view, and FIG. 18B is a G- FIG. 18C is a perspective view showing a laminated structure of the forgery prevention medium. In the anti-counterfeit medium 40 shown in FIGS. 18A to 18C, the first resin layer 42 and the fine particle 1 described above are dispersed on the support 41 from the fine particle-containing layer 12 dispersed in the transparent resin 11. The anti-counterfeit sheet 10 and the second resin layer 43 are laminated, and the anti-counterfeit sheet 10 is embedded in the anti-counterfeit medium 40. When the anti-counterfeit sheet is embedded in the anti-counterfeit medium, the anti-counterfeit sheet can be prevented from being peeled off and misused.

  In the anti-counterfeit medium according to the present invention, the fine particles having transparency, or the anti-counterfeit sheet having the base portion and the identification portion having transparency, can recognize the fine particles or the identification portion included in the article. Therefore, it is possible to provide a high anti-counterfeiting function, and it is possible to produce a forgery-preventing medium that can easily determine the authenticity.

Hereinafter, each structure in the forgery prevention medium of this invention is demonstrated.
The fine particles can be the same as those described in the above-mentioned section “I. Fine particles”, and the anti-counterfeit sheet having a transparent base portion and an identification portion is described in “IV. Since it can be the same as that described in the section “B. Second Aspect” of forgery prevention, description thereof is omitted here.

  In the case of using fine particles, as a method for fixing and fixing the fine particles on the support, a method of applying the above-described anti-counterfeiting ink on the support and solidifying, or the above-described anti-counterfeiting on the support A method of transferring toner and a method of sticking or embedding the above-described anti-counterfeit sheet on a support can be used.

As a method of sticking the anti-counterfeit sheet on the support, it may be stuck as it is or transferred. Furthermore, when the anti-counterfeit medium is composed of a plurality of layers, the anti-counterfeit sheet may be embedded between the constituent layers of the anti-counterfeit medium.
Here, as a method of embedding the anti-counterfeit sheet, for example, a method of laminating a desired constituent layer on a support of an anti-counterfeit medium and adhering each layer by an adhesive layer, an adhesive layer, thermocompression bonding or the like can be mentioned. .
Note that the anti-counterfeit sheet laminated in the anti-counterfeit medium may be provided in part or in the entirety. Further, other constituent layers in the forgery prevention medium are appropriately selected according to the type of the forgery prevention medium.

  The support used in the present invention is appropriately selected according to the use of the anti-counterfeit medium of the present invention. The support may or may not have optical transparency. Examples of the material for the support include glass, resin, metal, paper, and the like.

Moreover, when the support body, the 1st resin layer, the forgery prevention sheet, and the 2nd resin layer are laminated | stacked, the 1st resin layer does not need to have a light transmittance. In particular, when a functional layer (for example, an image receiving layer or a hologram layer) capable of recording or having arbitrary information is formed between the support and the first resin layer, the first resin layer transmits light. It is preferable to have properties. When the first resin layer has light transmittance, the light transmittance can be the same as the light transmittance of the base material constituting the anti-counterfeit sheet. As the first resin layer, for example, a general resin substrate can be used.
On the other hand, the second resin layer is light transmissive. The light transmittance of the second resin layer can be the same as the light transmittance of the base material constituting the anti-counterfeit sheet. As the second resin layer, for example, a general resin substrate can be used.

  Applications of the anti-counterfeit medium of the present invention include, for example, cash vouchers, gift cards, credit cards, ID cards, passports, driver's licenses, brand products, automobile parts, precision equipment parts, home appliances, cosmetics, pharmaceuticals, foods, OA supplies. Goods, sporting goods, CD, DVD, software, tobacco, liquor, etc.

  The present invention is not limited to the above embodiment. The above-described embodiment is an exemplification, and the present invention has any configuration that has substantially the same configuration as the technical idea described in the claims of the present invention and that exhibits the same effects. Are included in the technical scope.

  Hereinafter, the present invention will be specifically described with reference to examples.

[Example 1]
(Formation of sacrificial layer and fine particle formation layer)
A water-soluble polymer film (PVA) was applied on a glass substrate, and a fine particle material (water-insoluble material: resist material) was applied.

(Exposure development)
Thereafter, exposure phenomenon processing was performed by photolithography so that only a desired pattern shape remained on the water-soluble polymer film.

(Particle collection process)
After the pattern formation, the water-soluble polymer film was dissolved to separate the particles from the base material, and the particles were collected.

[Example 2]
(Formation of sacrificial layer and fine particle formation layer)
A water-soluble polymer film (gelatin) was applied on a PET substrate, and a fine particle material (non-water-soluble material: printing ink) was applied. At this time, the pattern was printed directly.

(Particle collection process)
After the pattern formation, the water-soluble polymer film was dissolved to separate the particles from the base material, and the particles were collected.

DESCRIPTION OF SYMBOLS 1 ... Fine particle 2 ... Planar solid shape 3 ... Curved solid shape 4 ... Concave part 5 ... Front surface 6 ... Back surface 10 ... Forgery prevention sheet 11 ... Transparent resin 12 ... Fine particle content layer 31 ... Base part 32 ... Identification part 40 ... Counterfeit Prevention medium H ... Thickness L1, L2 ... Particle size

Claims (3)

An anti-counterfeit sheet having a fine particle-containing layer in which fine particles having identification information that can be observed by enlarging and that can be identified based on a shape are dispersed in a transparent resin, ,
The fine particles have transparency, include a resin material,
The anti-counterfeit sheet, wherein the identification information is an outer shape of the fine particles or an uneven shape formed on the surface of the fine particles. The base,
An identification part that is formed on the surface of the base part and can be observed by magnifying and has at least one of a convex part or a concave part having identification information that can be identified based on the shape; An anti-counterfeit sheet having
The base portion and the identification portion have transparency, and include a resin material,
The forgery-preventing sheet, wherein the size of the convex portion or the concave portion is in the range of 50 μm to 300 μm.   An anti-counterfeit medium comprising the anti-counterfeit sheet according to claim 1.