Package with IC tag

Abstract

To provide a package with an IC tag, appearance design property of which is not damaged because of the IC tag attached, and which holds operability of the IC tag.SOLUTION: An IC tag 10 is installed closer to an inner layer side than a metal flake-containing layer 3 of a laminate having a plastic film 2 and the metal flake-containing layer 3, the total light transmittance of the laminate compliant with JIS K7361-1:1997 is 10.0% or lower, the metal flake is a non-leafing type having an average length of 1-10 μm, and the ratio of the average length to the average thickness of the metal flake (average length / average thickness) is 25-100.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a package with an IC tag.

Background Art

[0002] IC tags, also called RFID tags, electronic tags, non-contact tags, etc., are becoming popular in various industries and fields for purposes such as traceability and efficient management of products due to the convenience of being able to read and write various information data related to products non-contact by radio waves during the sale of products in retail stores and their distribution processes. IC tags are generally attached to individual articles by sticking or tying them to the surface of the article itself or the package after wrapping the article.

[0003] However, when an IC tag is attached to a package, if the IC tag is in an exposed state, it may impair the design properties such as various patterns and textures that give a decorative effect to the appearance of the package. When emphasizing such design properties, it is preferable that the IC tag is attached in a state where it is hidden and not visible from the outside on the appearance of the package.

[0004] When the package has a paper base material, since paper generally has high light-shielding properties, the IC tag can be easily hidden on the appearance of the package by providing the IC tag inside the base material. On the other hand, when a plastic film is used as the base material, since the plastic film generally has higher light transmittance than paper, even if the IC tag is provided inside the base material, the IC tag may not be sufficiently hidden on the appearance of the package.

[0005] As a means for imparting light-shielding properties to a packaging material having a plastic film as a base material, for example, as described in Patent Document 1, it is known to provide a metal layer such as an aluminum foil or an aluminum vapor deposition film.

Prior Art Documents

Patent Documents

[0006] Patent Document 1 Japanese Patent Application Laid-Open No. 2001-121649 Summary of the Invention Problems to be Solved by the Invention

[0007] However, when an IC tag is attached to a packaging material having a metal layer as described above, the information recorded on the IC tag may not be readable by an RFID reader due to the influence of the metal on communication by weak electromagnetic waves or the like. Therefore, in a package with an IC tag, there is a need for a means that can conceal the IC tag without preventing the reading of the recorded information of the IC tag by an RFID reader, that is, without disturbing the operability of the IC tag.

[0008] Further, in the flexible packaging material having the metal layer, when an IC tag is provided on the inner layer side of the metal layer, usually, due to an IC tag having a thickness of about several hundred μm to several mm, the flexible packaging material becomes thicker at the portion where the IC tag is provided than its surroundings, and the surface on the outer layer side of the metal layer appears distorted. Due to the highly reflective metal layer, the distortion is emphasized, and it may even appear as if there is a step. Such an appearance is not preferable because it impairs the designability of the package with an IC tag.

[0009] The present invention has been made to solve the above problems, and an object thereof is to provide a package with an IC tag in which the designability of the appearance is not impaired by the attachment of the IC tag, and the operability of the IC tag is maintained. Means for Solving the Problems

[0010] The present invention is based on finding a packaged body with an IC tag in which a layer containing a predetermined metal flake is provided on the packaged body, so that the recording information of the IC tag can be read by an RFID reader without impairing the designability of the appearance by the IC tag.

[0011] That is, in the present invention, an IC tag is installed on the inner layer side of a laminate having a plastic film and a metal flake-containing layer, relative to the metal flake-containing layer. The total light transmittance of the laminate measured in accordance with JIS K7361-1:1997 is 10.0% or less. The metal flake is of a non-leafing type, has an average length of 1 to 10 μm, and the ratio of the average length to the average thickness of the metal flake (average length / average thickness) is 25 to 100. The present invention provides a packaged body with an IC tag.

Advantages of the Invention

[0012] According to the present invention, it is possible to provide a packaged body with an IC tag in which the designability of the appearance is not impaired by the attachment of the IC tag, and the operability of the IC tag is maintained. That is, the packaged body with an IC tag of the present invention is designed to achieve both good designability of the appearance and maintenance of the operability of the hidden IC tag.

Brief Description of the Drawings

[0013]

Figure 1

Figure 2

Figure 3

Figure 4

Embodiments for Carrying Out the Invention

[0014] Hereinafter, the metal-coated package with an IC tag of the present invention will be described in detail. In this specification, the notation of the numerical range of "AA to BB" means "AA or more and BB or less".

[0015] The package with an IC tag of the present invention is one in which the IC tag is installed on the inner layer side of a laminate having a plastic film and a metal flake-containing layer, relative to the metal flake-containing layer. The laminate has a total light transmittance of 10.0% or less as measured in accordance with JIS K7361-1:1997. Further, the metal flakes are of the non-leafing type, have an average length of 1 to 10 μm, and the ratio of the average length to the average thickness of the metal flakes (average length / average thickness) is 25 to 100. By having such a metal flake-containing layer, it is possible to maintain the operability of the IC tag and prevent the design of the appearance from being impaired by the IC tag.

[0016] [Metal flake-containing layer] In the package with an IC tag of the present invention (hereinafter, sometimes simply referred to as the package), the IC tag is concealed from the outer layer side by the metal flake-containing layer. Such a concealed state is also effective in suppressing the act of falsifying the recorded information by illegally replacing the IC tag. The metal flake-containing layer may be formed over the entire area of the region visible from the outside of the package, or may be formed only in a part thereof. Patterns such as pictures, characters (product names, product displays, quality displays, etc.), figures, symbols, patterns, and patterns may be formed by the metal flake-containing layer. However, since the metal flake-containing layer is formed for the purpose of concealing the IC tag, it is formed in a wider area including at least the area where the IC tag is provided. Further, the metal flake-containing layer may be composed of one layer or may be composed of two or more layers.

[0017] Examples of the material of the metal flakes include metals and alloys such as aluminum, gold, silver, brass, titanium, chromium, nickel, nickel chromium, and stainless steel. As the material, one of these may be used alone, or two or more thereof may be used in combination. Among these, for example, when a white pigment-containing layer is provided on the outer layer side of the metal flake-containing layer as described later, aluminum and silver are preferable because a color tone close to white is easily obtained.

[0018] As the metal flakes, non-leafing type ones are used. In the process of applying and forming the metal flake-containing layer, non-leafing type metal flakes are less likely to float near the surface of the coating film, and in the metal flake-containing layer, they have a low orientation and the metal flakes are easily laminated in the thickness direction. As a result, multiple reflections can occur between the metal flakes, increasing the proportion of diffused light. Thereby, compared with the metal layer formed by the vapor deposition film or foil as described above, the distortion and step on the outer layer side surface of the package due to the thickness of the IC tag installed on the inner layer side of the metal flake-containing layer are less noticeable. In addition, by increasing the proportion of diffused light, the metal flake-containing layer can be made to have a color tone close to white, and when a pattern layer is formed on the outer layer side of the metal flake-containing layer, there is also an advantage that the color of the pattern is less likely to be impaired. Also, the lamination of the metal flakes in the thickness direction within the metal flake-containing layer also leads to a decrease in the total light transmittance of the laminate.

[0019] Non-leafing type metal flakes can be obtained, for example, by mixing a metal or alloy powder of the above material with a solvent and spreading and / or pulverizing the powder using a media stirring mill, ball mill, attritor, or the like. The metal flakes produced in this way have wavy irregularities on the surface, which is preferable because the proportion of diffused light increases. The length, thickness and aspect ratio of the metal flakes can be adjusted by the size, spreading and / or grinding time, load, etc. of media balls, beads, etc. For example, by increasing the spreading and grinding time and increasing the load and burden, the length of the resulting metal flakes becomes shorter and the thickness becomes thinner.

[0020] Non-leafing type metal flakes are those not surface-treated with long-chain saturated fatty acids such as palmitic acid, stearic acid and behenic acid. For example, those surface-treated with unsaturated fatty acids such as linoleic acid, or those not surface-treated are used. From the viewpoint of chemical resistance, etc., the metal flakes are preferably resin-coated. The resin-coated metal flakes can be produced, for example, by the methods described in JP-A-62-253668, JP-A-64-40566, JP-A-2003-213157, JP-A-2012-241039, etc.

[0021] On the other hand, when a layer containing leafing type metal flakes is applied and formed, the metal flakes tend to float and orient on the surface of the coating film, and most of the incident light from the surface of the coating film is specularly reflected by the metal flakes, so multiple reflections within the layer are less likely to occur. Therefore, when an IC tag is installed on the inner layer side of the layer, it is difficult to suppress the recognition of distortion and steps on the outer layer side surface of the layer due to the thickness of the IC tag. In addition, when a leafing type metal flake is applied and formed, it is not preferable also in that the orientation of the metal flake suppresses the volatilization of the solvent from the surface of the coating film and the amount of residual solvent in the coating film tends to increase.

[0022] The metal flakes have an average length of 1 to 10 μm, preferably 2 to 7 μm, more preferably 3 to 5 μm. From the perspective of ease of handling of the fine metal flakes, the average length is preferably 1 μm or more. Further, if the average length is 10 μm or less, in the metal flake-containing layer, the orientation is low, the metal flakes are likely to be laminated in the thickness direction, and the ratio of diffused light due to multiple reflections is likely to increase. The average length of the metal flakes is determined as the average value of the lengths of any 20 metal flakes observed with an optical microscope or an electron microscope in the plane direction of the metal flake-containing layer. Note that the length of one metal flake means the maximum length in the plane direction of the metal flake.

[0023] Also, the metal flakes preferably have an average thickness of 0.01 to 0.50 μm, more preferably 0.03 to 0.30 μm, and even more preferably 0.05 to 0.15 μm. If the average thickness is 0.01 μm or more, sufficient concealment by individual metal flakes can be obtained, and it is easy to reduce the total light transmittance of the laminate. Further, if the average thickness is 0.50 μm or less, the metal flakes are likely to be laminated in the thickness direction within the metal flake-containing layer, the ratio of diffused light due to multiple reflections between the metal flakes can be increased, and the total light transmittance of the laminate is likely to decrease. The average thickness of the metal flakes is determined as the average value of the thicknesses of any 20 metal flakes observed with an optical microscope or an electron microscope in the cross-section in the thickness direction of the metal flake-containing layer. Note that the thickness of one metal flake means that the cross-sectional image of the metal flake is divided into five regions with equal lengths in the length direction, and the thicknesses (t 1 、t 2 、t 3 、t 4 、t 5 ) of the central parts of each region are measured, and the value obtained by averaging t 1 ~t 5 .

[0024] The average length / average thickness of the metal flakes (hereinafter referred to as the aspect ratio) is 25 to 100, preferably 27 to 70, and more preferably 30 to 50. If the aspect ratio of the metal flakes is 25 or more, the orientation within the metal flake-containing layer is not overly disrupted, the metal flakes are likely to be laminated in the thickness direction, the proportion of diffused light due to multiple reflections between the individual metal flakes can be increased, and the total light transmittance of the laminate is likely to decrease. Also, when the aspect ratio is 100 or less, it is possible to suppress defects such as adjacent metal flakes coming into contact due to disruption of the orientation of the metal flakes, which would affect the operability of the IC tag like a metal foil or a metal vapor deposition film.

[0025] The content of the metal flakes in the metal flake-containing layer is preferably 20 to 60% by mass, more preferably 30 to 55% by mass, and even more preferably 35 to 50% by mass. If the content is 20% by mass or more, the IC tag installed on the inner layer side relative to the metal flake-containing layer is sufficiently concealed in terms of appearance. Also, if the content is 60% by mass or less, the influence on the operability of the IC tag due to contact between adjacent metal flakes is sufficiently suppressed, and good adhesion is easily obtained between the metal flake-containing layer and the layer adjacent thereto.

[0026] From the viewpoint of good adhesion and the like between the metal flake-containing layer and the layer adjacent thereto, it is preferable that the metal flake-containing layer contains a binder resin. Examples of the binder resin include polyolefin resins such as polyethylene resins and chlorinated polypropylene resins, poly(meth)acrylic resins, polyvinyl chloride resins, polyvinyl acetate resins, vinyl chloride-vinyl acetate copolymers, polystyrene resins, styrene-butadiene copolymers, vinylidene fluoride resins, polyvinyl alcohol resins, polyvinyl acetal resins, polyvinyl butyral resins, polybutadiene resins, polyester resins, polyamide resins, alkyd resins, epoxy resins, unsaturated polyester resins, thermosetting poly(meth)acrylic resins, melamine resins, urea resins, polyurethane resins, phenol resins, xylene resins, maleic acid resins, cellulose resins such as nitrocellulose, ethyl cellulose, acetyl butyl cellulose, and ethyl oxyethyl cellulose, rubber resins such as chlorinated rubber and cyclized rubber, petroleum resins, natural resins such as rosin and casein, and the like. Further, from the viewpoint of environmental conservation, it is also preferable to include, for example, so-called biodegradable plastics and the like made from plants such as trees, rice bran, and seeds. These may be used alone or in combination of two or more.

[0027] In the metal flake-containing layer, if necessary, optional additives such as fillers, stabilizers, plasticizers, antioxidants, light stabilizers such as ultraviolet absorbers, dispersants, thickeners, desiccants, lubricants, antistatic agents, crosslinking agents, and the like can be added.

[0028] The metal flake-containing layer may be a single layer, or a plurality of metal flake-containing layers having the same composition or different compositions may be laminated. By laminating a plurality of layers, the amount of metal flakes laminated in the thickness direction increases, and the ratio of diffused light due to the multiple reflections can be increased. The total thickness of the metal flake-containing layer is preferably 0.5 to 5.0 μm, more preferably 0.7 to 4.0 μm, and still more preferably 1.0 to 3.0 μm. If the thickness is 0.5 μm or more, the metal flakes are likely to be laminated in the thickness direction within the metal flake-containing layer, the proportion of diffused light due to multiple reflections between the metal flakes can be increased, and the total light transmittance of the laminate is likely to be decreased. Further, when the thickness is 5.0 μm or less, thickening of the entire package is suppressed, which is preferable in terms of production efficiency and processability. In addition, when a plurality of metal flake-containing layers are laminated, from the viewpoint of suppressing interface reflection between the layers, the difference in refractive index of the binder resin in each layer is preferably within 0.03, more preferably within 0.01.

[0029] The strength of diffusion in the metal flake-containing layer is L calculated from the spectral spectrum of total light reflection (SCI: Specular Component Include) in the plane direction of the metal flake-containing layer * a * b * The L value in the color system * (L * SCI), and L calculated from the spectral spectrum of diffused light reflection (SCE: Specular Component Exclude) * a * b * The L value in the color system * (L * SCE), and the ratio (L * SCE / L * SCI) can be indicated by.

[0030] SCI is the total reflected light including the light in the specular reflection direction, which is measured by closing the light trap after irradiating the sample surface with light from all directions using an integrating sphere. In contrast, SCE is the reflected light excluding the light in the specular reflection direction corresponding to the specular reflection direction, which is measured by opening the light trap corresponding to the specular reflection direction. Also, L * a * b * The color system is a color system that numerically represents the color space standardized by the International Commission on Illumination (CIE) in 1976 and is adopted in JIS Z8781-4:2013. Therefore, the L value (L * SCI) based on total internal reflection and the L value (L * SCE) based on diffused reflection light, and the ratio (L * SCE / L * SCI), which is a parameter indicating the ratio of diffused reflection light to total reflected light, can be said to be an index representing the intensity of diffused light in the metal flake-containing layer. * SCE / L * SCI) is a parameter indicating the ratio of diffused reflection light to total reflected light, and can be said to be an index representing the intensity of diffused light in the metal flake-containing layer.

[0031] Regarding the in-plane direction of the metal flake-containing layer, the L * SCE / L * SCI is usually obtained by measuring SCI and SCE from the inner layer side of the package because the metal flake-containing layer can be visually recognized from the inner layer side of the package. The L * SCI and L * SCE in this specification are average values obtained from the measured values of SCI and SCE at 20 locations within the sample surface. Note that the SCI and the SCE are preferably measured from the inner layer side of the packaging material with a black backing defined in "Optical System of Reflection Densitometer" of ISO 5 / 4 arranged on the outer layer side of the package. Typical measuring devices for SCI and SCE have a configuration compliant with geometric condition c of JIS Z8722:2009. The measurement conditions for SCE in this specification are as follows: light source of integrating sphere spectrophotometer: D65, position of light receiver: +8° with respect to the normal of the sample surface, opening angle of light receiver: 10°, position of light trap: -8° with respect to the normal of the sample surface, and field angle: 10°. Specifically, a handy type spectrophotometer ("CM-700d", manufactured by Konica Minolta Inc.) etc. can be used to measure SCI and SCE simultaneously.

[0032] General metal pigments are designed to increase the ratio of specularly reflected light and impart high gloss, that is, a strong metallic luster, and it is difficult to make the L * SCE / L * SCI small and 0.85 or more. The L * SCE / L *Even if the SCI is less than 0.85, when the IC tag is provided on the inner layer side rather than the metal layer made of the metal pigment, on the outer layer side of the metal layer, the distortion and step due to the thickness of the IC tag are likely to be prominent. Also, for example, when there is a white pigment-containing layer and further a pattern layer on the outer layer side of the metal layer, on the appearance of the metal layer, bright spots (shining points) that shine brightly in the plane are likely to be visually recognized. It is presumed that the white pigment-containing layer and the pattern layer are not necessarily of uniform thickness, and the portions where the metal layer is transparent are visually recognized as shining points due to local thickness unevenness or the like.

[0033] On the other hand, according to the metal flake-containing layer having a large proportion of diffuse reflection, low glossiness, and weak metallic luster, the distortion and step on the outer layer side surface of the package due to the thickness of the IC tag installed on the inner layer side rather than the metal flake-containing layer are less likely to be prominent. Also, as described above, even when the white pigment-containing layer and the pattern layer provided on the outer layer side of the metal flake-containing layer have local thickness unevenness, the visual recognition of the shining points is suppressed. From such a viewpoint, the L * SCE / L * The SCI is preferably 0.85 or more, more preferably 0.87 or more, and even more preferably 0.90 or more. The L * SCE / L * The fact that the SCI is 0.85 or more is also effective from the viewpoint of the concealability of the IC tag from the outer layer side of the package. The L * SCE / L * The upper limit of the SCI is not particularly limited, but is generally about 0.95. In addition, the L * From the viewpoint of the concealability of the IC tag from the outer layer side of the package, the SCI of the packaging material of the present invention is preferably 70 or more, more preferably 80 or more. The L * The upper limit of the SCI is not particularly limited, but is generally about 90.

[0034] [Plastic film] The plastic film serves as a base material of the package (laminate). The plastic film can be formed from one or more resins selected from, for example, polyolefin resins such as polyethylene (PE) - based and polypropylene (PP) - based resins, cyclic polyolefin resins, polystyrene resins, acrylonitrile - styrene copolymer (AS) resins, acrylonitrile - butadiene - styrene copolymer (ABS) resins, poly (meth) acrylic resins, polycarbonate resins, polyvinyl alcohol resins, ethylene - vinyl alcohol copolymer (EVOH), saponified ethylene - vinyl ester copolymer, polyester resins such as polyethylene terephthalate (PET), polybutylene terephthalate (PBT), and polyethylene naphthalate (PEN), polyamide resins such as various nylons (Ny), polyurethane resins, acetal resins, cellulose resins, polyvinylidene chloride resins (PVDC), etc. From the perspective of recyclability, it is preferably formed from only one type. Also, the plastic film may be a composite film in which two or more resin films are laminated.

[0035] The plastic film may be uniaxially stretched or biaxially stretched. Also, it may be formed by the inflation method or the melt extrusion coating method.

[0036] As the plastic film, from the perspective of heat resistance, etc., polyester resins, polyamide resins, etc. are preferable. Specific examples include a single polyester film, a single polyamide film such as nylon, and a composite film containing one or more of a polyester film and a polyamide film. Examples of the composite film include PET / Ny / PET, a co - extruded stretched film having a PET / Ny structure from the outer layer side, and a film in which one or more of a polyester film and a polyamide film are laminated with one or more of an ethylene - vinyl alcohol copolymer film and a polyvinylidene chloride film.

[0037] From the viewpoints of recyclability and cost, etc., it is preferable that the plastic film is not a blend of two or more resins or an opaque plastic film containing a pigment. In particular, when a pattern layer is formed on the inner layer side thereof, a highly transparent one is preferable in consideration of the visibility from the appearance of the pattern layer. It is preferable that the plastic film has a total light transmittance of 85% or more in accordance with JIS K7361-1:1997, more preferably 90% or more. Also, from the viewpoint of transparency, it is preferable that the haze in accordance with JIS K7136:2000 is 2% or less, more preferably 1% or less, still more preferably 0.5% or less.

[0038] The thickness of the plastic film is not particularly limited and can be appropriately set according to the use of the package, but usually it is preferably about 5 to 50 μm, more preferably 10 to 40 μm, still more preferably 12 to 25 μm. Also, from the viewpoints of good coating applicability of each layer formed thereon and good visibility of the pattern layer, etc., it is preferable that the arithmetic mean roughness Ra at a cut-off value of 0.8 mm measured in accordance with JIS B0601:1994 is 0.1 μm or less on both surfaces, more preferably 0.05 μm or less.

[0039] [Laminate] The laminate has the plastic film and the metal flake-containing layer. The laminate refers to one that does not contain the IC tag. The laminate may have, for example, a white pigment-containing layer on the outer layer side of the metal flake-containing layer. Also, it may have a pattern layer on the outer layer side of the white pigment-containing layer.

[0040] The total light transmittance of the laminate measured in accordance with JIS K7361-1:1997 is 10.0% or less, more preferably 8.0% or less, still more preferably 7.0% or less. If the total light transmittance is 10.0% or less, sufficient concealment of the IC tag from the outer layer side of the package can be achieved, and distortion and steps on the outer layer side surface of the package due to the thickness of the IC tag are less likely to be noticeable. It is also preferable from the viewpoint of suppressing light deterioration of the packaged product. The lower limit of the total light transmittance is not particularly limited, but is preferably 0.5% or more from the viewpoint of suppressing thickening of the entire package.

[0041] The total light transmittance preferably satisfies the above numerical range when measured from either the inner layer side or the outer layer side of the laminate. The total light transmittance of the laminate in this specification is the average value of the measured values at 20 locations in the plane of the laminate. Note that the measurement of the total light transmittance may be performed on the laminate before the IC tag is installed, or in the package with the IC tag installed, outside the IC tag installation area of the laminate.

[0042] (White pigment-containing layer) When the laminate has a white pigment-containing layer, the white pigment-containing layer is preferably provided on the outer layer side of the metal flake-containing layer. The white pigment-containing layer is effective, for example, when a design without gloss or a calm design is required in terms of the appearance of the package. Regular reflection from the metal flake-containing layer on the inner layer side of the white pigment-containing layer is further suppressed, and the concealment of the IC tag installed on the inner layer side of the metal flake-containing layer is increased.

[0043] Examples of the white pigment include titanium dioxide, barium sulfate, magnesium oxide, calcium carbonate, zinc oxide, lead white, etc. Among these, titanium dioxide is preferable from the viewpoint of concealment. The crystal structure of titanium dioxide includes anatase type, rutile type, and brookite type. Among these, the rutile type or brookite type with low photocatalytic activity is preferable, and the general-purpose rutile type is more preferable.

[0044] From the viewpoint of increasing diffused light and enhancing hiding power, the average primary particle diameter of the white pigment is preferably 150 to 500 nm, more preferably 250 to 450 nm. The average primary particle diameter of the white pigment in this specification can be calculated, for example, from an image taken by a transmission electron microscope. The same applies to the average primary particle diameters of various other pigments and inorganic particles.

[0045] The content of the white pigment in the white pigment-containing layer is preferably 3 to 50% by mass, more preferably 5 to 30% by mass, and still more preferably 7 to 20% by mass. When the content is 3% by mass or more, the total light transmittance of the laminate is likely to be within the above range, which is preferable for enhancing the hiding power from the outer layer side of the IC tag installed on the inner layer side rather than the metal flake-containing layer. Also, when the content is 50% by mass or less, good adhesion can be easily obtained between the white pigment-containing layer and the layer adjacent thereto.

[0046] The white pigment-containing layer preferably contains a binder resin. As the binder resin, the same ones as those contained in the metal flake-containing layer described above can be used.

[0047] The white pigment-containing layer preferably contains inorganic fine particles having an average primary particle diameter of 1 to 100 nm. The inorganic fine particles suppress the sedimentation of the white pigment in the white pigment-containing layer, and good adhesion can be easily obtained between the white pigment-containing layer and the layer adjacent thereto below it. The average primary particle diameter of the inorganic fine particles is more preferably 2 to 50 nm, and still more preferably 5 to 30 nm.

[0048] Examples of the inorganic fine particles include silica, alumina, zirconia, etc. Among these, silica is preferable because of its excellent transparency. Also, from the viewpoint of the operability of the IC tag, silica and alumina, which are excellent in insulation, are preferable. From the perspective of suppressing the sedimentation of the above-mentioned white pigment, etc., the content of the inorganic fine particles in the white pigment-containing layer is preferably 1 to 20 parts by mass, more preferably 2 to 15 parts by mass, and still more preferably 3 to 10 parts by mass with respect to 100 parts by mass of the white pigment.

[0049] In the white pigment-containing layer, if necessary, optional additives such as fillers, stabilizers, plasticizers, antioxidants, light stabilizers such as ultraviolet absorbers, dispersants, thickeners, desiccants, lubricants, antistatic agents, crosslinking agents, etc. can be added.

[0050] The white pigment-containing layer may be a single layer, or a plurality of white pigment-containing layers of the same composition or different compositions may be laminated. By laminating a plurality of layers, the concealability of the IC tag can be further enhanced. The thickness of the white pigment-containing layer is preferably 0.5 to 5.0 μm, more preferably 0.7 to 4.0 μm, and still more preferably 1.0 to 3.0 μm. When the thickness is 0.5 μm or more, the total light transmittance of the laminate is likely to be within the above range, which is preferable for enhancing the concealability from the outer layer side of the IC tag installed on the inner layer side with respect to the metal flake-containing layer. Also, when the thickness is 5.0 μm or less, thickening of the entire package is suppressed, which is preferable in terms of production efficiency and processability.

[0051] The total thickness of the white pigment-containing layer and the metal flake-containing layer is preferably 2.0 to 6.0 μm, more preferably 3.0 to 5.0 μm, and still more preferably 3.5 to 4.5 μm. When the total thickness is 2.0 μm or more, the total light transmittance of the laminate is likely to be within the above range, which is preferable for enhancing the concealability from the outer layer side of the IC tag installed on the inner layer side with respect to the metal flake-containing layer. Also, when the total thickness is 6.0 μm or less, thickening of the entire package is suppressed, which is preferable in terms of production efficiency and processability.

[0052] Further, the ratio (t1 / t2) of the thickness (t1) of the white pigment-containing layer to the thickness (t2) of the metal flake-containing layer is preferably from 0.2 to 2.0, more preferably from 0.3 to 1.8. By setting t1 / t2 to 0.2 or more, regular reflection by the metal flake-containing layer is likely to be suppressed, and it is easy to obtain a package having a non-glossy design or a calm design. Also, by setting t1 / t2 to 2.0 or less, it is easy to enhance the concealability from the outer layer side of the IC tag installed on the inner layer side rather than the metal flake-containing layer.

[0053] (Pattern layer) When the laminate has a pattern layer, from the viewpoint of emphasizing the design property, it is preferable that the pattern layer is provided on the further outer layer side of the white pigment-containing layer provided on the outer layer side of the metal flake-containing layer. The pattern constituting the pattern layer is a broad concept including characters (product names, product displays, quality displays, etc.), figures, photographs, symbols, patterns, patterns, solid printing, etc., and in the present invention, it is distinguished from the metal flake-containing layer and the white pigment-containing layer. That is, even when the metal flake-containing layer and the white pigment-containing layer represent a pattern such as a character or a figure, they are not included in the pattern layer. The pattern layer may be composed of one layer or may be composed of two or more layers. Also, the pattern layer may be full-surface printing or partial printing. The pattern layer can be formed, for example, by single-color or multicolor printing using process colors, or can also be formed by other special printing or the like.

[0054] As the colorant for the pattern layer, general-purpose dyes and pigments (for example, inorganic pigments such as lead yellow, titanium yellow, rose pink, cadmium red, ultramarine blue, cobalt blue; organic pigments such as quinacridone red, isoindolinone yellow, phthalocyanine blue; general-purpose black pigments such as carbon black, titanium black; dyes; pearl pigments, etc.) can be used. The pattern layer preferably contains a binder resin. As the binder resin, the same ones as the binder resin contained in the metal flake-containing layer described above can be used. The thickness of the pattern layer is not particularly limited, and it is preferably about 1 to 5 μm, more preferably 1 to 3 μm.

[0055] The metal flake-containing layer, the white pigment-containing layer, and the pattern layer can be formed, for example, on a plastic film, a sealant layer described later, etc. by a known printing method such as a gravure printing method, an offset printing method, a letterpress printing method, or a silk screen printing method.

[0056] [IC tag] As the IC tag installed on the laminate, a label type having an adhesive or a seal part on one side is preferably used. The IC tag is attached by sticking it to the laminate. The size of the IC tag is not particularly limited and varies depending on the purpose of use of the IC tag. However, a rectangular shape with a side length of several mm to about one hundred and several tens of mm, or a disc shape with a diameter of several mm to about one hundred and several tens of mm is common. The thickness is smaller than the side length or diameter, and is preferably 0.1 to 20 mm, more preferably 0.2 to 5 mm, and even more preferably 0.3 to 2 mm.

[0057] By installing the IC tag on the inner layer side rather than the metal flake-containing layer, it is difficult to be visually recognized from the outer layer side of the package, and the distortion or step on the outer layer side surface of the package due to the thickness of the IC tag is not noticeable, and it does not affect the designability of the appearance of the package. Also, in this way, since the IC tag is in a state of being concealed from the outer layer side, the act of falsifying the recorded information by illegally replacing it can be suppressed.

[0058] [Laminated structure] Examples of the laminated structure of the packaged body with an IC tag include, for example, those having the plastic film, the metal flake-containing layer, and the IC tag in this order from the outer layer side (Type 1). Also included are those having the metal flake-containing layer, the plastic film, and the IC tag in this order from the outer layer side (Type 2). Also included are those having the metal flake-containing layer, the IC tag, and the plastic film in this order from the outer layer side (Type 3).

[0059] Typical embodiments of the packaged body with an IC tag having a laminated structure corresponding to each of Types 1 to 3 are shown in FIGS. 1 to 4. In each figure, the top is the outer layer side and the bottom is the inner layer side. As long as the laminate in the packaged body 1 with an IC tag has a plastic film 2 and a metal flake-containing layer 3, other layers may be included as constituent layers. In any case, the IC tag 10 is installed on the inner layer side of the metal flake-containing layer 3. FIGS. 1 to 4 illustrate embodiments that also have a white pigment-containing layer 4 and a pattern layer 5. Also, for example, a sealant layer may be provided on the innermost layer, and an intermediate substrate having light transmissivity may be provided between the plastic film 2 and the sealant layer. Also, a top coat layer may be provided on the outermost layer, and a gas barrier layer or the like may be provided. These layers may be adhered via an adhesive layer.

[0060] The packaged body 1 with an IC tag shown in FIG. 1 has, in order from the outer layer side, a laminate in which a plastic film 2, a pattern layer 5, a white pigment-containing layer 4, and a metal flake-containing layer 3 are laminated, and an IC tag 10. This corresponds to the embodiment of Type 1, and the pattern layer 5 can be formed by reverse printing on the inner layer side surface of the plastic film 2. Since the plastic film 2 functions as a protective layer for the pattern layer 5, it is useful in that the durability of the pattern layer 5 can be enhanced even without a top coat layer. When the object to be packaged is food, a liquid substance, or the like, it is preferable to provide a sealant layer on the innermost layer of the package 1 in order to avoid direct contact between the object to be packaged and the IC tag 10.

[0061] The packaged body 1 with an IC tag shown in FIG. 2 has, in order from the outer layer side, a laminate in which a pattern layer 5, a plastic film 2, a white pigment-containing layer 4, and a metal flake-containing layer 3 are laminated, and an IC tag 10. This corresponds to the above-described type 1, and the pattern layer 5 can be formed by surface printing on the outer layer side surface of the plastic film 2. Therefore, the pattern layer 5 can be easily formed on demand. From the viewpoint of protecting the pattern layer 5, it is preferable to provide a top coat layer on the outer layer side of the pattern layer 5. Also, as described above, from the viewpoint of avoiding direct contact between the object to be packaged and the IC tag 10, it is preferable to provide a sealant layer on the innermost layer of the package 1.

[0062] The packaged body 1 with an IC tag shown in FIG. 3 has, in order from the outer layer side, a laminate in which a pattern layer 5, a white pigment-containing layer 4, a metal flake-containing layer 3, and a plastic film 2 are laminated, and an IC tag 10. This corresponds to the above-described type 2. Similar to the case of the packaged body 1 shown in FIG. 2 described above, the pattern layer 5 can be formed by surface printing on the outer layer side surface of the plastic film 2 and can be easily formed on demand. Similarly, it is preferable to provide a top coat layer on the outer layer side of the pattern layer 5 and to provide a sealant layer on the innermost layer of the package 1.

[0063] The packaged body 1 with an IC tag shown in Fig. 4 has a laminate in which a pattern layer 5, a white pigment-containing layer 4, a metal flake-containing layer 3, and a plastic film 2 are laminated in this order from the outer layer side, and has an IC tag 10 on the outer layer side of the plastic film 2. This is an aspect corresponding to the above type 3. Similar to the case of the packaged body 1 shown in Fig. 2 described above, the pattern layer 5 can be formed by surface printing on the outer layer side surface of the plastic film 2 and is easy to form on demand. Similarly, it is preferable to provide a top coat layer on the outer layer side of the pattern layer 5. In this packaged body 1, the IC tag 10 can be prevented from directly contacting the object to be packaged by the plastic film 2.

[0064] As the laminated structure of the packaged body with an IC tag of the present invention, the following (1) to (12) can be further exemplified. In the following (1) to (12), the left layer is the outer layer side, and " / " means the boundary of each layer. In addition, the location where the IC tag can be installed is represented by " / / ", and when there are a plurality of " / / ", any of these locations may be used. Among the following (1) to (12), (1) to (8) correspond to the above type 1, and (9) to (12) correspond to the above type 2 or 3. From the viewpoint of the design property of the appearance by the pattern of the pattern layer, it is preferable that at least a part of the layer provided on the outer layer side of the pattern layer has light transmissivity in the plane.

[0065] (1) Plastic film / Pattern layer / White pigment-containing layer / Metal flake-containing layer / / Intermediate base material layer / / Sealant layer (2) Plastic film / Gas barrier layer / Pattern layer / White pigment-containing layer / Metal flake-containing layer / / Sealant layer (3) Plastic film / Gas barrier layer / Pattern layer / White pigment-containing layer / Metal flake-containing layer / / Intermediate base material layer / / Sealant layer (4) Plastic film / Pattern layer / White pigment-containing layer / Metal flake-containing layer / / Gas barrier layer / / Intermediate base material layer / / Sealant layer (5) Topcoat layer / Pattern layer / Plastic film / White pigment-containing layer / Metal flake-containing layer / / Intermediate substrate layer / / Sealant layer (6) Topcoat layer / Pattern layer / Plastic film / Gas barrier layer / White pigment-containing layer / Metal flake-containing layer / / Sealant layer (7) Topcoat layer / Pattern layer / Plastic film / Gas barrier layer / White pigment-containing layer / Metal flake-containing layer / / Intermediate substrate layer / / Sealant layer (8) Topcoat layer / Pattern layer / Plastic film / White pigment-containing layer / Metal flake-containing layer / / Gas barrier layer / / Intermediate substrate layer / / Sealant layer (9) Topcoat layer / Pattern layer / White pigment-containing layer / Metal flake-containing layer / / Plastic film / / Intermediate substrate layer / / Sealant layer (10) Topcoat layer / Pattern layer / White pigment-containing layer / Metal flake-containing layer / / Plastic film / / Gas barrier layer / / Sealant layer (11) Topcoat layer / Pattern layer / White pigment-containing layer / Metal flake-containing layer / / Plastic film / / Gas barrier layer / / Intermediate substrate layer / / Sealant layer (12) Topcoat layer / Pattern layer / White pigment-containing layer / Metal flake-containing layer / / Plastic film / / Gas barrier layer / / Intermediate substrate layer / / Sealant layer

[0066] (Sealant layer) Examples of the material constituting the sealant layer include polyolefin resins such as low-density PE (LDPE), linear low-density PE (LLDPE), medium-density PE (MDPE), high-density PE (HDPE), ethylene-vinyl acetate copolymer, propylene homopolymer, ethylene-propylene block copolymer, and ethylene-propylene random copolymer. One or more of these resins can be used. The sealant layer may be composed of a single layer or multiple layers of two or more layers. In addition, the sealant layer is preferably an unstretched film made of any of the above resins in order to suppress shrinkage during heat sealing.

[0067] For example, when the package is a retort pouch, from the perspective of heat resistance, polypropylene-based resins such as a propylene homopolymer, an ethylene-propylene block copolymer, and an ethylene-propylene random copolymer, and HDPE are preferred. When using the polypropylene-based resin, it is preferably used appropriately according to the purpose. For example, when the package is for frozen foods and cold resistance is emphasized, an ethylene-propylene block copolymer is preferred. Also, from the perspective of transparency, an ethylene-propylene random copolymer is preferred, and from the perspective of heat resistance, a propylene homopolymer is preferred.

[0068] Further, when the package is a lid of a container with a lid, the sealant layer preferably has easy peelability. Easy peelability means, for example, when the sealant layer of the lid of a container with a lid is joined to the container body, the property that the lid can be easily peeled from the container body when the container with a lid is opened. A sealant layer having easy peelability can be formed by mixing two or more resins, one resin (a resin having good adhesion to the container body) and another resin (a resin having poor adhesion to the container body and being incompatible with the one resin). Such resins vary depending on the material of the container with a lid and cannot be generally stated. For example, in the case of a container with a lid made of PP, a resin obtained by mixing PP as the one resin and one or more selected from PE, polybutene, and polystyrene as the other resin can form a sealant layer having easy peelability. In this case, the sealant layer may have a multilayer structure, and only the innermost layer (the layer on the side joined to the container body) of the sealant layer may have easy peelability.

[0069] The thickness of the sealant layer is not particularly limited and is appropriately set according to the use of the package, the type and properties of the packaged product, etc. Usually, it is preferably about 10 to 200 μm. For example, when the package is a pouch (especially a retort pouch), the thickness of the sealant layer is more preferably 20 to 150 μm, and even more preferably 30 to 100 μm. When the package is a container with a lid, the thickness of the sealant layer is more preferably 15 to 80 μm, and even more preferably 20 to 60 μm.

[0070] (Top coat layer) The top coat layer is formed for the purpose of preventing and protecting scratches and dirt on the surface of the pattern layer. In some cases, it may also be formed for the purpose of enhancing the design by imparting a glossy or matte feeling to the pattern of the pattern layer. The top coat layer can be formed by a known top coat agent (overcoat agent). Examples of the top coat agent include OP varnish (gloss varnish) that imparts a glossy feeling and matte OP varnish for dulling, and they can be selected and used according to each purpose. The top coat layer can be formed, for example, by gravure printing, offset printing, letterpress printing, flexographic printing, silk screen printing, etc. Among these, gravure printing is preferred. The thickness of the top coat layer is preferably about 0.2 to 10 μm, more preferably 0.5 to 8.0 μm, and even more preferably 0.7 to 5.0 μm.

[0071] (Gas barrier layer) The gas barrier layer is formed for the purpose of suppressing the permeation of oxygen, water vapor, etc. The gas barrier layer is formed, for example, on the plastic film or the intermediate base material layer. The gas barrier layer may be composed of a single layer or multiple layers of two or more layers. From the viewpoints of suppressing bright spots in appearance, visibility of the pattern layer, operability of the IC tag, etc., the gas barrier layer is a single layer of an inorganic oxide vapor deposition film or a composite layer formed with a gas barrier coating film on the vapor deposition film, and it is preferable that the vapor deposition film is disposed on the plastic film or the intermediate base material layer side. From the viewpoint of improving the adhesion of the gas barrier layer, the surface on which the gas barrier layer is formed is preferably subjected to surface treatment in advance, such as corona discharge treatment, ozone treatment, low-temperature plasma treatment using oxygen gas, nitrogen gas, etc., glow discharge treatment, oxidizing agent treatment, application of an anchor coating agent, etc.

[0072] 〔Vapor deposition film〕 As the vapor deposition film which is an example of the gas barrier layer, it is preferably an inorganic oxide from the viewpoints of suppressing bright spots, visibility of the pattern layer, operability of the IC tag, and cost. Examples of the elements constituting the inorganic substance from which the inorganic oxide is derived include silicon (Si), aluminum (Al), magnesium (Mg), etc. The vapor deposition film can be formed by, for example, physical vapor deposition (PVD) methods such as vacuum vapor deposition, sputtering, ion plating, etc., chemical vapor deposition (CVD) methods such as plasma chemical vapor deposition, thermal chemical vapor deposition, photo chemical vapor deposition, etc.

[0073] The film thickness of the vapor deposition film varies depending on the forming material, required gas barrier performance, etc., but usually, it is preferably about 5 to 200 nm, more preferably 5 to 150 nm, and even more preferably 10 to 100 nm. In the case of inorganic oxides such as silicon oxide and aluminum oxide, it is preferably about 5 to 100 nm, more preferably 5 to 50 nm, and even more preferably 10 to 30 nm.

[0074] 〔Gas barrier coating film〕 The gas barrier coating film which is an example of the gas barrier layer is, for example, of the general formula R 1 n M(OR 2 ) m (In the formula, R 1 , R 2R is an organic group having 1 to 8 carbon atoms, M is a metal atom. n represents an integer of 0 or more, m represents an integer of 1 or more, and n + m is the valence of M.) One or more alkoxides represented by the formula, a polyvinyl alcohol-based resin and / or an ethylene-vinyl alcohol copolymer are polycondensed by a sol-gel method in the presence of a sol-gel method catalyst, an acid, water and an organic solvent to obtain a coating solution, and the coating solution is applied and heat-treated at 50 to 300 ° C. for 0.05 to 60 minutes to form the coating film. As the coating method, for example, it can be carried out by coating means such as roll coating such as a gravure roll coater, spray coating, spin coating, dipping, brushing, bar coating, applicator, etc. It is preferable that the dry film thickness of the coating film is about 0.01 to 30 μm, more preferably 0.05 to 20 μm, and still more preferably 0.1 to 10 μm, by one or a plurality of coatings. From the viewpoint of improving the gas barrier property, the gas barrier coating film is preferably formed on the surface of the vapor deposition film.

[0075] (Intermediate substrate layer) The intermediate substrate layer is provided as needed for improving the strength of the package and the processability, and as a substrate for forming other layers. Examples of the constituent material of the intermediate substrate layer include plastic films. As the plastic film as the intermediate substrate layer, the same ones as the plastic films on the outer layer side described above can be used.

[0076] (Adhesive layer) From the viewpoint of improving the bonding strength between the layers, each constituent layer of the package may be laminated via an adhesive layer. A known adhesive for dry lamination can be used for forming the adhesive layer. Examples of the dry lamination adhesive include polyvinyl acetate adhesives, polyacrylate adhesives, cyanoacrylate adhesives, ethylene copolymer adhesives, cellulose adhesives, polyester adhesives, polyamide adhesives, polyimide adhesives, amino resin adhesives such as urea resins and melamine resins, phenolic resin adhesives, epoxy adhesives, polyurethane adhesives (e.g., curable types of polyols and isocyanate compounds), reactive (meth)acrylic adhesives, rubber adhesives such as chloroprene rubber, nitrile rubber, and styrene-butadiene rubber, silicone adhesives, and inorganic adhesives such as alkali metal silicates and low melting point glasses. The thickness of the adhesive layer is preferably 0.5 to 100 μm, more preferably 1 to 50 μm.

[0077] [Package] The form of the packaged article with an IC tag of the present invention is not particularly limited as long as it is based on a plastic film. Examples include flexible packages such as packaging bags, and plastic molded articles. The package may be not only the final product but also an intermediate product. Further, it may be a raw roll of a sheet-like laminate before forming these. Specific examples of the flexible package include bags such as pillows, gusset bags, three-side seal bags, four-side seal bags, standing pouches, and zip-lock bags, lids, labels, and the like. Specific examples of the plastic molded article include tube containers such as laminated tubes, vacuum formed articles such as food trays, blow molded articles such as bottles, and injection molded articles.

Examples

[0078] Hereinafter, the present invention will be described in detail with reference to examples, but the present invention is not limited thereto.

[0079] [Production of Packaged Article with IC Tag (1)] (Example 1-1) After subjecting one surface of a plastic film (a transparent PET film with a thickness of 12 μm and an arithmetic mean roughness Ra of 0.05 μm or less on both surfaces) to corona discharge treatment, a vapor deposition film of silicon oxide with a thickness of 10 nm was formed. Further, after performing plasma treatment with a mixed gas of oxygen and argon, a coating liquid mainly composed of ethyl silicate and polyvinyl alcohol was applied with a gravure roll coater to form a gas barrier coating film with a dry film thickness of 300 nm, and a gas barrier layer composed of the vapor deposition film and the gas barrier coating film was formed. Next, the step of applying and drying a coating liquid for forming a metal flake-containing layer having the following formulation on the gas barrier layer was repeated twice, and a metal flake-containing layer (metal flake content: 39.5% by mass) with a total dry film thickness of 3.0 μm (1.5 μm + 1.5 μm) was formed. Also, a polyurethane-based adhesive (a curing type of polyol and isocyanate compound; the same applies hereinafter) was applied and dried on an intermediate base material layer (a stretched Ny film with a thickness of 15 μm) to form an adhesive layer with a thickness of 3 μm. The adhesive layer formed on this intermediate base material layer was laminated to the surface of the metal flake-containing layer by dry lamination. A label-type IC tag (approx. 30 mm × approx. 100 mm, thickness approx. 1 mm) was attached to the surface of the intermediate base material layer. Next, a polyurethane-based adhesive was applied and dried on a sealant layer (a single-layer film of CPP: an unstretched polypropylene-based resin (ethylene-propylene block copolymer) with a thickness of 70 μm) to form an adhesive layer with a thickness of 3 μm. The adhesive layer formed on this sealant layer was laminated to the surface of the intermediate base material layer where the IC tag was attached by dry lamination to obtain a packaged body with an IC tag.

[0080] <Coating liquid for forming metal flake-containing layer> · 100 parts by mass of a composition containing metal flakes and mineral spirits (metal flake content: 85% by mass) (Metal flakes: non-leafing type aluminum flakes, average length 3.2 μm, average thickness 0.08 μm, aspect ratio 40) · Binder resin (polyurethane resin, melting point 140 °C) 130 parts by mass · Dilution solvent appropriate amount

[0081] The lamination structure of the package is, from the outer layer side, in the order of plastic film / gas barrier layer (vapor deposition film / gas barrier coating film) / metal flake-containing layer / adhesive layer / intermediate base material layer / IC tag / adhesive layer / sealant layer.

[0082] (Example 2-1) In Example 1-1, for the coating liquid for forming the metal flake-containing layer, the metal flakes were changed to those shown in Table 1 below, and also, the step of coating and drying was performed only once to form a metal flake-containing layer with a dry film thickness of 1.5 μm. Otherwise, in the same manner as in Example 1-1, a package with an IC tag was obtained.

[0083] (Example 3-1) In Example 1-1, the metal flakes in the coating liquid for forming the metal flake-containing layer were changed to those shown in Table 1 below. Otherwise, in the same manner as in Example 1-1, a package with an IC tag was obtained.

[0084] (Comparative Examples 1-1 and 2-1) In Example 2-1, the metal flakes in the coating liquid for forming the metal flake-containing layer were changed to those shown in Table 1 below. Otherwise, in the same manner as in Example 2-1, a package with an IC tag was obtained.

[0085] (Comparative Example 3-1) In Example 1-1, on the gas barrier layer, instead of the metal flake-containing layer, a metal vapor deposition film (aluminum) with a thickness of 100 nm was formed by vacuum vapor deposition. Otherwise, in the same manner as in Example 1-1, a package with an IC tag was obtained.

[0086] [Various Measurements and Evaluations] For each of the packages of the above Examples and Comparative Examples, the following various measurements and evaluations were performed. The results are summarized in Table 1 below.

[0087] (Total Light Transmittance) In accordance with JIS K7361-1:1997, the total light transmittance was measured from the outer layer side of the package (outside the installation area of the IC tag; laminate) using a haze meter ("HM-150", manufactured by Murakami Color Technology Laboratory Co., Ltd.). For each package (laminate), 20 measurements were taken, and the average value of the total light transmittance was calculated.

[0088] (L * SCI / L * SCE) With a black backing defined by the "Optical System of Reflection Densitometer" of ISO 5 / 4 arranged on the outer layer side of the package (outside the installation area of the IC tag; laminate), using a spectrophotometer ("CM-700d", manufactured by Konica Minolta Japan Inc.), from the inner layer (sealant layer) side of the package, L * SCI and L * SCE were measured (light source: D65, viewing angle: 10°). For each package (laminate), 20 measurements were taken, and the average values of L * SCI and L * SCE were calculated. Table 1 shows L * SCE / L * SCI and L * SCI. L * SCE / L * The larger the values of L

[0089] (Appearance evaluation (1)) In a room with multiple fluorescent lamps on the ceiling, the package was tilted at various angles and observed from the outer layer side. Whether a step due to the thickness of the IC tag was visible on the outer layer surface was determined by the presence of an IC tag on the inner layer side of the package. The judgment criteria were set as "A" for those where the step was not prominent, "B" for those where the step was slightly visible, and "C" for those where the step was prominent. Table 1 shows the judgment results.

[0090] (Operability of the IC tag) The package was placed on a wooden table with the outer layer side facing up. Then, a handy type RFID reader ("BHT-1281QULWB-CE", manufactured by Denso Wave Incorporated; reading output 10.0 dBm (weakest)) was brought close to the sample piece vertically downward from about 200 cm above it, and the operability of the IC tag was evaluated by measuring the readable distance of the recorded information of the IC tag. Each package was measured 5 times. It can be said that the smaller the readable distance, the better the operability of the IC tag. When the minimum readable distance in all 5 measurements was 100 cm or more, it was judged as "A", when it was 10 cm or more and less than 100 cm, it was judged as "B", when it was less than 10 cm, it was judged as "C", and when it was unreadable, it was judged as "D". Table 1 shows the judgment results.

[0091]

Table 1

[0092] As can be seen from the results shown in Table 1, the package of the example was hardly recognized to have an IC tag on the inner layer side in terms of appearance, and it was confirmed that the IC tag operates well. On the other hand, when the aspect ratio of the metal flakes was less than 25 (Comparative Example 1-1), and in the case of the leafing type (Comparative Example 2-1), the presence of the IC tag on the inner layer side was recognized in terms of appearance. Also, in the conventional example (Comparative Example 3-1) where the light was blocked by the metal vapor deposition layer, the step due to the IC tag was conspicuous in terms of appearance, and the operability of the IC tag was inferior. From the above, it was recognized that the package of the example was not impaired in the designability of the appearance due to the attachment of the IC tag, and the operability of the IC tag was maintained.

[0093] [Fabrication of Package with IC Tag (2)] (Example 1-2) In Example 1-1, before forming the metal flake-containing layer on the gas barrier layer, a coating solution for forming a white pigment-containing layer with the following formulation was applied and dried to form a white pigment-containing layer with a dry film thickness of 1.2 μm. Otherwise, in the same manner as in Example 1-1, a packaged body with an IC tag was obtained.

[0094] <Coating solution for forming white pigment-containing layer> · 10 parts by mass of titanium oxide particles (average primary particle diameter: 300 nm) · 0.5 parts by mass of inorganic fine particles (silica, average primary particle diameter: 20 nm) · 100 parts by mass of a binder resin (polyurethane-based resin, melting point: 140°C) · An appropriate amount of a diluting solvent

[0095] The laminated structure of the packaged body is, from the outer layer side, plastic film / gas barrier layer (vapor deposition film / gas barrier coating film) / white pigment-containing layer / metal flake-containing layer / adhesive layer / intermediate base material layer / IC tag / adhesive layer / sealant layer in this order.

[0096] (Example 2-2) In Example 2-1, before forming the metal flake-containing layer on the gas barrier layer, the step of applying and drying the same coating solution for forming a white pigment-containing layer as in Example 1-2 was repeated twice to form a white pigment-containing layer with a total dry film thickness of 2.5 μm (1.0 μm + 1.5 μm). Otherwise, in the same manner as in Example 2-1, a packaged body with an IC tag was obtained.

[0097] (Example 3-2) In Example 3-1, before forming the metal flake-containing layer on the gas barrier layer, the same coating solution for forming a white pigment-containing layer as in Example 1-2 was applied and dried to form a white pigment-containing layer with a dry film thickness of 1.2 μm. Otherwise, in the same manner as in Example 3-1, a packaged body with an IC tag was obtained.

[0098] (Comparative Example 1-2) In Comparative Example 1-1, before forming the metal flake-containing layer on the gas barrier layer, the same coating liquid for forming a white pigment-containing layer as in Example 1-2 was applied and dried to form a white pigment-containing layer with a dry film thickness of 1.2 μm. Otherwise, in the same manner as in Comparative Example 1-1, a packaged body with an IC tag was obtained.

[0099] (Comparative Example 2-2) In Comparative Example 2-1, before forming the metal flake-containing layer on the gas barrier layer, the same coating liquid for forming a white pigment-containing layer as in Example 1-2 was applied and dried to form a white pigment-containing layer with a dry film thickness of 1.2 μm. Otherwise, in the same manner as in Comparative Example 2-1, a packaged body with an IC tag was obtained.

[0100] (Comparative Example 3-2) In Comparative Example 3-1, before forming the metal vapor deposition film on the gas barrier layer, the same coating liquid for forming a white pigment-containing layer as in Example 1-2 was applied and dried to form a white pigment-containing layer with a dry film thickness of 1.2 μm. Otherwise, in the same manner as in Comparative Example 3-1, a packaged body with an IC tag was obtained.

[0101] [Appearance Evaluation (2)] Regarding each of the above-described packaged bodies of the examples and comparative examples, in a room equipped with a plurality of fluorescent lamps on the ceiling, the packaged bodies were tilted at various angles and observed from the outer layer side. In terms of appearance, those in which no bright spots were visually recognized were determined as "A", those in which bright spots were slightly visually recognized were determined as "B", and those in which bright spots were prominent were determined as "C", and the results are shown together with Table 1 above.

[0102] As can be seen from the results shown in Table 1, it was confirmed that the packaged bodies of the examples also had the effect of suppressing the visibility of bright spots when they had a white pigment-containing layer on the outer layer side of the metal flake-containing layer.

Explanation of Reference Numerals

[0103] 1 Packaged body with an IC tag 2 Plastic film 3 Metal flake-containing layer 4 White pigment-containing layer 5 Pattern layer 10 IC tags

Claims

1. An IC tag is installed on the inner layer side of a laminate having a plastic film and a metal flake-containing layer, relative to the metal flake-containing layer, the laminate has, in this order from the outer layer, the metal flake-containing layer, the plastic film, and the IC tag, the total light transmittance of the laminate measured in accordance with JIS K7361-1:1997 is 10.0% or less, the metal flakes are of the non-leafing type, have an average length of 1 to 10 μm, and the ratio of the average length to the average thickness of the metal flakes (average length / average thickness) is 25 to 100, an IC tag-equipped package (however, excluding packages having a plastic film on the outer layer side relative to the metal flake-containing layer).

2. An IC tag is installed on the inner layer side of a laminate having a plastic film and a metal flake-containing layer, relative to the metal flake-containing layer, the laminate has, in this order from the outer layer, the metal flake-containing layer, the IC tag, and the plastic film, the total light transmittance of the laminate measured in accordance with JIS K7361-1:1997 is 10.0% or less, the metal flakes are of the non-leafing type, have an average length of 1 to 10 μm, and the ratio of the average length to the average thickness of the metal flakes (average length / average thickness) is 25 to 100, an IC tag-equipped package (however, excluding packages having a plastic film on the outer layer side relative to the metal flake-containing layer).

3. The IC tag-equipped package according to claim 1 or 2, wherein the content of the metal flakes in the metal flake-containing layer is 20 to 60% by mass.

4. The IC tag-equipped package according to any one of claims 1 to 3, wherein the thickness of the metal flake-containing layer is 0.5 to 5.0 μm.

5. The IC tag-equipped package according to any one of claims 1 to 4, having a white pigment-containing layer on the outer layer side relative to the metal flake-containing layer.

6. The IC tag-equipped package according to claim 5, wherein the total thickness of the metal flake-containing layer and the white pigment-containing layer is 2.0 to 6.0 μm.

7. The IC tag-equipped package according to claim 5 or 6, having a pattern layer on the outer layer side relative to the white pigment-containing layer.

8. The IC tag-equipped package according to any one of claims 1 to 7, wherein the innermost layer is a sealant layer.

Images