JP2019073643A - Adhesive sheet - Google Patents

Abstract

To provide an adhesive sheet capable of preventing information from being illegally read.SOLUTION: An adhesive sheet 10 of the present invention includes a substrate 1, an adhesive layer 2 provided on one surface side of the substrate 1, and an information carrying part 3 being a pattern formed by a luminescent agent which emits light by being irradiated with energy rays (excitation light L1). The energy rays are ultraviolet rays, and the luminescent agent emits light by being irradiated with ultraviolet rays.SELECTED DRAWING: Figure 2

Description

  The present invention relates to an adhesive sheet.

  In recent years, it has been widely practiced to obtain personal information from various cards or to obtain product information described in products and catalogs by reading printed barcodes by optical means (for example, patent Reference 1).

  Patent Document 1 discloses a bar code label having an adhesive label and a bar code provided on the surface of the adhesive label. This bar code is a white label printed with black bars at predetermined intervals.

  However, such barcodes can be easily read by the naked eye, so information may be read fraudulently.

JP-A-8-77314

  An object of the present invention is to provide a pressure-sensitive adhesive sheet capable of preventing unauthorized reading of information.

Such an object is achieved by the present invention described in the following (1) to (5).
(1) base material,
A pressure-sensitive adhesive layer provided on one side of the substrate;
And an information carrying portion which is a pattern formed of a light emitting agent which emits light by being irradiated with energy rays.

(2) The energy ray is ultraviolet light,
The pressure-sensitive adhesive sheet according to the above (1), wherein the light-emitting agent emits light when irradiated with ultraviolet light.

  (3) The pressure-sensitive adhesive sheet according to (1) or (2), wherein the information carrier unit is provided between the base and the pressure-sensitive adhesive layer.

  (4) The pressure-sensitive adhesive sheet according to any one of (1) to (3), wherein the information carrier unit is provided on the side opposite to the side of the pressure-sensitive adhesive layer facing the substrate.

  (5) The pressure-sensitive adhesive sheet according to any one of (1) to (4), wherein in a plan view of the pressure-sensitive adhesive sheet, a region where the information carrier is formed is smaller than the base material.

  According to the present invention, since the position of the information carrier (for example, a bar code or the like) can not be checked visually, it is possible to prevent the information from being read illegally.

FIG. 1 is a cross-sectional view showing a pressure-sensitive adhesive sheet (first embodiment) of the present invention. FIG. 2 is a cross-sectional view showing a state in which information of the information carrier of the pressure-sensitive adhesive sheet shown in FIG. 1 is read. FIG. 3 is a cross-sectional view showing a method of manufacturing the pressure-sensitive adhesive sheet shown in FIG. FIG. 4 is a cross-sectional view showing the method for producing the pressure-sensitive adhesive sheet shown in FIG. FIG. 5 is a cross-sectional view showing the method for producing the pressure-sensitive adhesive sheet shown in FIG. FIG. 6 is a plan view of the pressure-sensitive adhesive sheet shown in FIG. FIG. 7 is a cross-sectional view showing a pressure-sensitive adhesive sheet (second embodiment) of the present invention. FIG. 8 is a cross-sectional view showing a method of manufacturing the pressure-sensitive adhesive sheet shown in FIG. FIG. 9 is a cross-sectional view showing a method of manufacturing the pressure-sensitive adhesive sheet shown in FIG. FIG. 10 is a cross-sectional view showing a method of manufacturing the pressure-sensitive adhesive sheet shown in FIG.

Hereinafter, preferred embodiments of the present invention will be described in detail.
First Embodiment
FIG. 1 is a cross-sectional view showing a pressure-sensitive adhesive sheet (first embodiment) of the present invention. FIG. 2 is a cross-sectional view showing a state in which information of the information carrier of the pressure-sensitive adhesive sheet shown in FIG. 1 is read. FIG. 3 is a cross-sectional view showing a method of manufacturing the pressure-sensitive adhesive sheet shown in FIG. FIG. 4 is a cross-sectional view showing the method for producing the pressure-sensitive adhesive sheet shown in FIG. FIG. 5 is a cross-sectional view showing the method for producing the pressure-sensitive adhesive sheet shown in FIG. FIG. 6 is a plan view of the pressure-sensitive adhesive sheet shown in FIG.

  As shown in FIG. 1, the pressure-sensitive adhesive sheet 10 of the present invention comprises a substrate 1, a pressure-sensitive adhesive layer 2 provided on one surface (a lower surface in the drawing) of the substrate 1, and energy beams. And an information carrier 3 which is a pattern formed of a light emitting agent which emits light by being emitted.

  Thus, the configuration can be such that the information of the information carrier 3 can not be read unless the light emitting agent is irradiated with the energy beam. For example, when the light-emitting agent is a down conversion material described later, under the visible light environment, the information carrying unit 3 can not be visually recognized and the information of the information carrying unit 3 can not be read. In addition, when the ultraviolet light is irradiated as the excitation light L1, the light emission light L2 which is visible light can be read. Therefore, it is possible to prevent unauthorized reading of information.

  The "information carrier unit" is not particularly limited, but one-dimensional codes such as barcodes, two-dimensional codes such as QR codes (registered trademark), information such as characters, numbers, symbols, etc. Say what was carried.

  In addition, "information" is not particularly limited, but includes, for example, the price, the size, the place of manufacture, the name of a person or a company, the address, the age, etc. of a product.

  In the present specification, "ultraviolet light" refers to light having a wavelength of about 200 nm to 400 nm, "infrared light" refers to light having a wavelength of about 780 nm to 1500 nm, and "visible light". Refers to light with a wavelength greater than 400 nm and less than 780 nm.

  Moreover, the adhesive sheet 10 is laminated | stacked on the peeling liner 4 from the adhesive layer 2 side in the unused state shown in FIG. Then, the pressure-sensitive adhesive sheet 10 is peeled off from the release liner 4 and attached to an adherend.

(Peeling liner)
The release liner 4 is a sheet material that can be released from the pressure-sensitive adhesive layer 2 and protects the pressure-sensitive adhesive layer 2. The release liner 4 may, for example, be a film or paper.

  Examples of the film include polyethylene terephthalate and polypropylene, and examples of the paper include high-quality paper, kraft paper, glassine paper and the like.

  The release liner 4 is preferably coated with silicone or the like so as to be removable from the pressure-sensitive adhesive layer 2.

  In addition, the thickness of the release liner 4 is preferably, for example, 50 μm or more and 250 μm in consideration of handleability. Here, the thickness of the release liner 4 is an average value of thicknesses measured at 10 randomly selected locations.

Hereinafter, each part of the adhesive sheet 10 is demonstrated.
(Base material)
The substrate 1 is a portion having a function of supporting the pressure-sensitive adhesive layer 2.

  The substrate 1 is preferably one having light transmittance (visible light transmittance and ultraviolet transmittance) regardless of whether it is colored or colorless. Thus, the information carrier 3 can be read through the base 1.

  Examples of the constituent material of the substrate 1 include various resin materials, various metal materials, various ceramic materials, vegetable materials such as cellulose, and animal materials such as animal protein (for example, keratin).

  Examples of the constituent material of the substrate 1 include polyesters such as polyethylene terephthalate, polybutylene terephthalate and polyethylene naphthalate; acetates such as cellulose triacetate and cellulose diacetate; and resin materials such as polyolefins such as polyethylene and polypropylene.

Moreover, the base material 1 may contain components other than what was mentioned above. As such components, for example, colorants such as dyes and pigments, antioxidants such as anilides and phenols, modifiers, rust inhibitors, fillers, surface lubricants, corrosion inhibitors, heat stabilizers Lubricants, antistatic agents, polymerization inhibitors, crosslinking agents, catalysts, plasticizers, leveling agents, thickeners, softeners, dispersing agents and the like.
The base 1 may be a porous body or a laminate including a plurality of layers.

  In addition, the substrate 1 may be subjected to surface treatment for enhancing the adhesion to the pressure-sensitive adhesive layer 2.

  Examples of such surface treatment include polyester-based, polyurethane-based, acrylic-based primer coating, corona treatment and the like.

  The thickness of the substrate 1 is not particularly limited, but is preferably 15 μm or more and 500 μm or less, and more preferably 20 μm or more and 200 μm or less.

(Pressure-sensitive adhesive layer)
Examples of the pressure-sensitive adhesive forming the pressure-sensitive adhesive layer 2 include acrylics, polyurethanes, silicones, and synthetic rubbers.

  Among these, acrylics are preferable in terms of high transparency and excellent long-term storage stability.

  Examples of the acrylic pressure-sensitive adhesive include those obtained by crosslinking a polymer containing, as a component, a monomer imparting adhesiveness, a monomer imparting cohesive force, a monomer having a crosslinkable functional group, and the like.

  Examples of the tackifying monomer include ethyl acrylate, butyl acrylate, 2-ethylhexyl acrylate, lauryl methacrylate and the like.

  Examples of the monomer imparting cohesion include methyl acrylate, methyl methacrylate, styrene and vinyl acetate.

  Examples of the monomer having a crosslinkable functional group include monomers having a hydroxyl group such as 2-hydroxyethyl acrylate, 2-hydroxyethyl methacrylate, and 3-hydroxypropyl methacrylate, and monomers having a carboxyl group such as acrylic acid.

  As a crosslinking agent, an isocyanate type crosslinking agent, an epoxy type crosslinking agent, a metal chelate type crosslinking agent etc. are mentioned.

  As an isocyanate type crosslinking agent, biuret bodies, such as tolylene diisocyanate, hexamethylene diisocyanate, isophorone diisocyanate, xylylene diisocyanate, isocyanurate body, an adduct body, etc. are mentioned.

  As an epoxy type crosslinking agent, N, N, N ', N'-tetraglycidyl-m-xylene diamine, a 1,3-bis (N, N- diglycidyl aminomethyl) cyclohexane etc. are mentioned.

  Examples of the metal chelate type crosslinking agent include aluminum trisacetylacetonate, titanium tetraacetylacetonate and the like.

  The storage elastic modulus at a temperature of 23 ° C. and a frequency of 1 Hz of the pressure-sensitive adhesive layer 2 measured according to JIS K7244-6: 1999 is preferably 0.01 MPa or more and 0.1 MPa or less, and 0.02 MPa or more It is more preferable that it is 0.08 MPa or less. Thus, when the pressure-sensitive adhesive sheet 10 is peeled off from the adhered state in which the pressure-sensitive adhesive sheet 10 is adhered to the adherend 100, the pressure-sensitive adhesive layer 2 is deformed and the information carrier 3 is also deformed. Therefore, it is possible to make it difficult to read the information carrier unit 3 when the pressure-sensitive adhesive sheet 10 is peeled off and then attached again.

  The thickness of the pressure-sensitive adhesive layer 2 is not particularly limited, but is preferably 15 μm or more and 500 μm or less, and more preferably 20 μm or more and 200 μm or less.

(Information carrier)
The information carrier unit 3 is formed of an ink layer formed using an ink containing a light emitting agent that emits light by being irradiated with energy rays, and becomes an arbitrary pattern (in the present embodiment, a barcode). ing.

  As the ink, a water-based ink, a solvent-based ink, a UV curable ink, a latex ink or the like can be used.

  An aqueous ink is an ink in which a binder resin is dissolved in an aqueous solvent. The solvent-based ink is an ink in which a binder resin is dissolved in a solvent. The UV curable ink is an ink in which a binder resin is dissolved in a liquid monomer which is cured by UV irradiation. The latex ink is an ink in which a binder resin is dispersed in a dispersion medium.

  Examples of the binder resin include, but are not limited to, (meth) acrylic acid, (meth) acrylic acid ester, acrylonitrile, cyanoacrylate, acrylamide, olefin, styrene, vinyl acetate, vinyl chloride, vinyl alcohol, vinyl ether, vinyl pyrrolidone And homopolymers or copolymers of vinylpyridine, vinylcarbazole, vinylimidazole, and vinylidene chloride, fluororesins, and natural resins. Among them, at least one of (meth) acrylic resin and styrene- (meth) acrylic acid copolymer resin is preferable, and at least one of acrylic resin and styrene-acrylic acid copolymer resin is more preferable, and styrene -Acrylic acid copolymer resin is more preferable. The above-mentioned copolymer may be any form among a random copolymer, a block copolymer, an alternating copolymer, and a graft copolymer.

  The light emitting agent is, for example, a wavelength that emits light of a wavelength different from the wavelength of the received light (absorbed light), such as a material that performs upconversion light emission (upconversion material) or a material that performs downconversion light emission (downconversion material) There is a conversion luminescent agent charge.

  In the present specification, a material that emits upconversion light (upconversion material) is a material that is excited by absorbing light of a predetermined wavelength and has a function of emitting (emitting) light of a wavelength shorter than the wavelength. It means that. Further, in the present specification, the down conversion light emitting material (down conversion material) is excited by absorbing light of a predetermined wavelength, and has a function of emitting (emitting) light of a wavelength longer than the wavelength. It refers to the material.

  In particular, by using an up-conversion material as a light-emitting agent, for example, a long wavelength energy ray such as infrared light (hereinafter, also simply referred to as “light” or “excitation light L1 (see FIG. 2)”) Can emit visible light from the upconversion material.

  The upconversion material is not particularly limited as long as it has the function of being excited by absorbing light of a predetermined wavelength and emitting (emitting) light of a wavelength shorter than the wavelength, but the following conditions It is preferable to satisfy

  The upconversion material is preferably in particulate form. This facilitates handling of the upconversion material. Also, the use of special solvents to dissolve the upconversion material can be omitted.

  When the upconversion material is in the form of particles, the average particle diameter of the particles is preferably 10 nm or more and 200 nm or less, and more preferably 15 nm or more and 100 nm or less. Thereby, the luminous efficiency of the upconversion material can be further improved.

  The wavelength of light for exciting the upconversion material (excitation light L1) is preferably 780 nm or more and 4000 nm or less, more preferably 800 nm or more and 2500 nm or less, and still more preferably 820 nm or more and 1400 nm or less.

  Thereby, the luminous efficiency of the upconversion material can be further improved. It also broadens the selection of upconversion materials. In addition, as the light source of the light emitting and receiving device 200 (reader), one which is inexpensive and has a simple configuration and which is widely spread in general can be suitably used.

  The peak wavelength of light emission by the upconversion material is preferably 400 nm or more and 780 nm or less, and more preferably 420 nm or more and 730 nm or less. Thereby, the light emitted by the up conversion material can be made visible.

  The upconversion material may be composed of an organic material, but is preferably composed of a material containing an inorganic substance. Thereby, the durability of the sheet S containing the upconversion material can be further improved.

  Note that the upconversion material made of an organic material and the upconversion material made of a material containing an inorganic substance may be used in combination.

  Examples of the organic material (organic material capable of emitting upconversion light) constituting the upconversion material include 4- [N- (2-hydroxyethyl) -N- (methyl) aminophenyl] -4 ′-(6-hydroxy). Hexylsulfonyl) stilbene (APSS excitation light wavelength: 962 to 968 nm, emission color: yellowish green), and the like.

  Examples of the inorganic substance constituting the upconversion material (inorganic substance capable of emitting upconversion light) include, for example, inorganic substances containing lanthanoid ions and inorganic substances containing transition metal ions.

  Among them, when the upconversion material contains an inorganic substance containing a lanthanoid ion, the light emission efficiency of the upconversion material can be further improved.

In addition, when the upconversion material contains a transition metal ion (for example, Ti ²⁺ ) -containing inorganic substance, the cost of the upconversion material can be reduced while the luminous efficiency of the upconversion material is sufficient.

  Examples of the lanthanoid ion-containing inorganic substance capable of up conversion emission include halides and oxides doped with one or more lanthanoid ions, oxides (eg, rare earth oxides, zinc oxide, zirconium oxide, and complex oxides thereof) Substances), sulfides (for example, rare earth oxides etc.), and composite materials of these.

Examples of halides, oxides, and sulfides to which lanthanoid ions are doped include BaY ₂ F ₈ , KZnF ₃ , NaYF ₄ , NaYb (WO ₄ ) ₂ , Ga ₂ S ₃ -La ₂ O ₃ , and Y ₂ O. ₃ , Gd ₂ O ₃ , ZrO ₂ , ZnO, BaTiO ₃ , ZrF ₂ -SiO ₂ , ZnO-SiO _{2 and the} like.

Specific examples of the lanthanoid ion-containing inorganic substance capable of emitting upconversion light include Na: Y: Yb: Er doped NaYF ₄ (Y: Yb: Er = 78: 20: 2, excitation light wavelength: 980 nm, emission color: green ), Y: Yb: Er doped NaYF ₄ (Y: Yb: Er = 69: 30: 1, excitation light wavelength: 980 nm, emission color: blue), Y: Yb: Tm doped NaYF ₄ (Y: Yb: Tm = 78: 20: 2, excitation light wavelength: 980 nm, emission color: red, BaCl ₂ doped with Er ³⁺ (excitation light wavelength: 1535 nm, emission color: green), and the like.

Further, examples of the transition metal ion-containing inorganic substance capable of up conversion emission include Ti ²⁺ -doped MgCl ₂ (excitation light wavelength: 1060 to 1075 nm, emission color: reddish purple), and the like.

  Also, plural kinds of up-conversion materials different in conditions (for example, shape, composition, type of surface treatment, size, etc.) may be used.

  By using a down conversion material as a light emitting agent, for example, when light having a short wavelength such as ultraviolet light (excitation light L1) is irradiated to a material containing a light emitting agent, light in the wavelength region of visible light from the down conversion material It can be emitted (luminescent). Since the energy ray is ultraviolet light and the light emitting agent emits light by being irradiated with ultraviolet light, it is relatively easy to select the material of the light emitting agent and relatively inexpensive to obtain. It has the advantage of

  The downconversion material is preferably in particulate form. This facilitates handling of the down conversion material. Also, the use of special solvents for dissolving the downconversion material can be omitted.

  When the down conversion material is in the form of particles, the average particle diameter of the particles is preferably 10 nm or more and 200 nm or less, and more preferably 15 nm or more and 100 nm or less. Thereby, the light emission efficiency of the down conversion material can be further improved.

  The wavelength of light (excitation light) for exciting the down conversion material is preferably 200 nm or more and 400 nm or less, and more preferably 300 nm or more and 380 nm or less.

  Thereby, the light emission efficiency of the down conversion material can be further improved. It also broadens the choice of downconversion materials. Further, as a light source for emitting light of the down conversion material, one which is inexpensive and has a simple configuration and which is generally widely spread can be suitably used.

  The peak wavelength of light emission by the down conversion material is preferably 400 nm or more and 780 nm or less, and more preferably 420 nm or more and 730 nm or less. Thereby, light emission by the down conversion material can be made visible light.

  The down conversion material may be composed of an organic material, but is preferably composed of a material containing an inorganic substance. Thereby, the durability of the sheet S including the down conversion material can be further improved.

Examples of the down conversion material include Y ₂ O ₃ : Eu (emission wavelength: 620 to 630 nm), ZnS: Cu (emission wavelength: 530 to 540 nm), ZnS: Al (emission wavelength: 445 to 455 nm), and the like. .

  Also, plural kinds of down conversion materials different in conditions (for example, shape, composition, type of surface treatment, size, etc.) may be used.

  In the present invention, the upconversion material and the downconversion material may be used in combination.

  According to such an information carrying unit 3, the information carrying unit 3 can not be visually recognized under the visible light environment, and the information of the information carrying unit 3 can not be read. However, as shown in FIG. When the excitation light L1 is irradiated using the light emitting device 200, the emission light L2 can be read. Therefore, it is possible to prevent unauthorized reading of information.

  Further, in plan view of the pressure-sensitive adhesive sheet 10, the region 30 in which the information carrier 3 is formed is smaller than the base 1. As a result, if the position of the information carrier 3 is not known in advance, reading becomes difficult, and it is possible to prevent unauthorized reading of information more reliably.

  In plan view of the adhesive sheet 10, the area of the region 30 where the information carrier 3 is formed is preferably 5% to 50% of the area of the substrate 1, and 10% to 20% of the substrate 1 Is more preferred. Thereby, the area of the region 30 can be made sufficiently smaller than the area of the substrate 1. Therefore, reading becomes more difficult if the position of the information carrier 3 is not known in advance.

  Further, since the information carrier 3 is provided between the base 1 and the adhesive layer 2, when the adhesive sheet 10 is peeled off from the release liner 4, the information carrier 3 is on the outside. It is not exposed. Therefore, it is possible to prevent the information carrier unit 3 from being worn unintentionally and being unable to read information.

The adhesive sheet 10 of such this embodiment is manufactured as follows, for example.
First, as shown in FIG. 3, printing is performed on the substrate 1 using an ink containing a light emitting agent to form the information carrier 3. On the other hand, as shown in FIG. 4, the pressure-sensitive adhesive layer 2 is coated on the release liner 4. Then, as shown in FIG. 5, the base material 1 is laminated on the pressure-sensitive adhesive layer 2 from the information carrier 3 side, and thereafter, the pressure-sensitive adhesive layer 2 is cured.

Second Embodiment
FIG. 7 is a cross-sectional view showing a pressure-sensitive adhesive sheet (second embodiment) of the present invention. FIG. 8 is a cross-sectional view showing a method of manufacturing the pressure-sensitive adhesive sheet shown in FIG. FIG. 9 is a cross-sectional view showing a method of manufacturing the pressure-sensitive adhesive sheet shown in FIG. FIG. 10 is a cross-sectional view showing a method of manufacturing the pressure-sensitive adhesive sheet shown in FIG.

  Hereinafter, the second embodiment of the pressure-sensitive adhesive sheet of the present invention will be described with reference to these drawings, but differences from the above-described embodiment will be mainly described, and the same matters will not be described.

  The present embodiment is the same as the first embodiment except that the formation position of the information carrier is different.

  As shown in FIG. 7, the information carrier 3 is provided between the adhesive layer 2 and the release liner 4. That is, the information carrier 3 is provided on the side opposite to the side of the pressure-sensitive adhesive layer 2 facing the base 1. Thus, in the attached state, it is possible to prevent the information carrier unit 3 from being unintentionally worn away and being unable to read information. Furthermore, after peeling off the release liner 4 from the pressure-sensitive adhesive sheet 10A and attaching it to the adherend, when the pressure-sensitive adhesive sheet 10A is peeled off, the information carrier portion 3 is more easily deformed by the deformation of the pressure-sensitive adhesive layer 2. Therefore, it is possible to make it difficult to read the information carrier unit 3 when the pressure-sensitive adhesive sheet 10 is peeled off and then attached again.

  In such a configuration, when the adherend 100 is made of a material that transmits the excitation light L1 and the light emission light L2, the information carrier 3 is irradiated with the excitation light L1 through the adherend 100. The emitted light L2 can be received through the adherend 100. That is, the information can be read from the adherend 100 side.

  When light emission light L2 is received through the adherend 100, the base material 1 is preferably dark. Thereby, the light emission light L2 can be made to stand out, and information can be read more reliably.

The pressure-sensitive adhesive sheet 10A according to this embodiment is manufactured, for example, as follows.
As shown in FIG. 8, printing is performed on the release liner 4 using an ink containing a light emitting agent to form the information carrier 3. Then, when the information carrier 3 is fixed, the adhesive layer 2 is coated on the release liner 4 so as to cover the information carrier 3 as shown in FIG. And as shown in FIG. 10, the base material 1 is bonded on the adhesive layer 2, and the adhesive layer 2 is hardened.

  Although the preferred embodiments of the present invention have been described above, the present invention is not limited to these.

  For example, the pressure-sensitive adhesive sheet may have at least one intermediate layer between the substrate and the pressure-sensitive adhesive layer. For example, the substrate may have an adhesion enhancing layer (primer layer or the like) or the like.

  Moreover, although the said embodiment demonstrated the case where light-emitting agent light-emitted visible light, light (for example, infrared rays and an ultraviolet-ray) besides the visible light area may be light-emitted.

DESCRIPTION OF SYMBOLS 10 adhesive sheet 10A adhesive sheet 1 base material 2 adhesive layer 3 information carrying | support part 30 area | region 4 peeling liner 100 adherend 200 light receiving / emitting device L1 excitation light L2 emitted light

Claims (5)

A substrate,
A pressure-sensitive adhesive layer provided on one side of the substrate;
And an information carrying portion which is a pattern formed of a light emitting agent which emits light by being irradiated with energy rays. The energy beam is ultraviolet light,
The pressure-sensitive adhesive sheet according to claim 1, wherein the light-emitting agent emits light when irradiated with ultraviolet light.   The pressure-sensitive adhesive sheet according to claim 1, wherein the information carrier unit is provided between the base and the pressure-sensitive adhesive layer.   The pressure-sensitive adhesive sheet according to claim 1 or 2, wherein the information carrier unit is provided on the side opposite to the side facing the substrate of the pressure-sensitive adhesive layer.   The pressure-sensitive adhesive sheet according to any one of claims 1 to 4, wherein in a plan view of the pressure-sensitive adhesive sheet, a region where the information carrier is formed is smaller than the base material.

Images