JP2020196533A - Packaging material, packaging container and lid body - Google Patents

Abstract

To provide a packaging material which has excellent designability based on metallic glossiness at high level without using a metal layer.SOLUTION: A packaging material has a structure such that at least a plastic film, a printing layer, an adhesive layer and a sealant layer are laminated in this order from an outer layer side, in which the printing layer and the adhesive layer are adjacent to each other, the packaging material has a brilliant printing layer containing a brilliant pigment and a binder resin as the printing layer, and satisfies the following conditions 1 and 2. <Condition 1> When diffused light reflection SCE from the outer layer side of the packaging material is measured and L* value of L*a*b* color system calculated from spectral spectra of the diffused light reflection SCE is represented by L*SCE, L*SCE is 40 or more. <Condition 2> When specular glossiness at 60 degrees from the outer layer side of the packaging material is measured according to JIS Z8741:1997, a coefficient of variation of the specular glossiness at 60 degrees calculated from the measured value is less than 0.100.SELECTED DRAWING: Figure 1

Description

The present invention relates to packaging materials, packaging containers and lids.

The packaging material may be decorated with a high-brightness metallic luster from the viewpoint of producing a sense of luxury and luxury of the object to be packaged to create an aesthetic appearance. As such a decorative means, for example, forming a metal layer such as a metal vapor deposition film or a metal foil is generally performed.

However, the packaging material using the metal layer has a problem that the cost increases. Further, among the metal layers, the metal vapor deposition film cannot be produced in-line with other layers constituting the packaging material, so that there is a problem that the production efficiency is poor, and the metal foil is difficult to handle in the metal layer. There is a problem.
Furthermore, when a packaging material using a metal layer is heated in a microwave oven, microwaves in the microwave oven are reflected on the surface of the metal layer, causing sparks, which may cause a malfunction or accident of the microwave oven. There is also a problem that the contents in the packaging container cannot be sufficiently heated.

Therefore, for example, Patent Document 1 proposes a packaging material in which a glossy layer is formed with an ink agent containing a high-brightness aluminum paste having a predetermined concentration instead of the metal layer.

JP-A-2017-81589

However, the packaging material in which the glossy layer is formed of aluminum paste as in Patent Document 1 has a certain metallic luster, but often does not have a high level of metallic luster.

The present invention has been made to solve the above technical problems, and is a packaging material having excellent design due to a high level of metallic luster without using a metal layer, and packaging using the packaging material. It is intended to provide a container and a lid.

That is, the present invention provides the following [1] to [3].
[1] At least, the plastic film, the printing layer, the adhesive layer, and the sealant layer are laminated from the outer layer side in this order, and the printing layer and the adhesive layer are adjacent to each other. A packaging material having a brilliant printing layer containing a brilliant pigment and a binder resin as a printing layer and satisfying the following conditions 1 and 2.
<Condition 1>
When the diffused light reflection SCE is measured from the outer layer side of the packaging material and the L ^* value of the L ^* a ^* b ^* color system calculated from the spectral spectrum of the diffused light reflection SCE is L ^* SCE, L ^* SCE Is over 40.
<Condition 2>
The 60-degree mirror glossiness was measured from the outer layer side of the packaging material in accordance with JIS Z8741: 1997, and the coefficient of variation of the 60-degree mirror glossiness calculated from the measured values was less than 0.100.
[2] A packaging container in which at least a part thereof is formed of the packaging material according to the above [1].
[3] A lid made of the packaging material according to the above [1].

According to the present invention, it is possible to provide a packaging material, a packaging container and a lid having excellent design due to a high level of metallic luster without using a metal layer.

It is the schematic sectional drawing which shows an example of the laminated structure of the packaging material of this invention. It is the schematic sectional drawing which shows an example of the laminated structure of the packaging material of this invention. It is the schematic sectional drawing which shows an example of the laminated structure of the packaging material of this invention. It is an image figure of the cross section of the brilliant printing layer 3a of the packaging material of an Example. It is an image figure of the cross section of the brilliant printing layer 3a of the packaging material of the comparative example. It is sectional drawing which shows an example of the pouch for the microwave oven in the packaging container of this invention. It is a top view which shows an example of the container with a lid among the packaging containers of this invention. FIG. 7 is a sectional view taken along line IV-IV of FIG. It is the schematic sectional drawing which shows another example of the laminated structure of the packaging material of this invention. It is a schematic plan view which shows another example of the pouch for the microwave oven in the packaging container of this invention. It is a sectional view of XI-XI of FIG.

Hereinafter, the packaging material of the present invention, and the packaging container and lid using the packaging material will be described in detail. In addition, the notation of the numerical range of "AA to BB" in this specification means "AA or more and BB or less".

[Packaging material]
The packaging material of the present invention comprises at least a structure in which a plastic film, a printing layer, an adhesive layer and a sealant layer are laminated from the outer layer side in this order, and the printing layer and the adhesive layer are adjacent to each other. The printing layer has a brilliant printing layer containing a brilliant pigment and a binder resin, and satisfies the following conditions 1 and 2.
<Condition 1>
When the diffused light reflection SCE is measured from the outer layer side of the packaging material and the L ^* value of the L ^* a ^* b ^* color system calculated from the spectral spectrum of the diffused light reflection SCE is L ^* SCE, L ^* SCE Is over 40.
<Condition 2>
The 60-degree mirror glossiness was measured from the outer layer side of the packaging material in accordance with JIS Z8741: 1997, and the coefficient of variation of the 60-degree mirror glossiness calculated from the measured values was less than 0.100.

<Laminated structure>
1 to 3 show an outline of a laminated structure of the packaging material 1 of the present invention in the thickness direction. In FIGS. 1 to 3, the upper side is the outer layer side and the lower side is the inner layer side. In the packaging material 1 of FIGS. 1 to 3, a plastic film 2, a printing layer (a printing layer having a brilliant printing layer 3a), an adhesive layer 6a, and a sealant layer 4 are laminated in this order from the outer layer side.
Further, the packaging material 1 of FIGS. 1 to 3 has an intermediate base material layer 5 and another adhesive layer 6b between the printing layer and the sealant layer 4. Further, the packaging material 1 of FIG. 2 has a pattern printing layer 3b on the outer layer side of the glittering printing layer 3a as a printing layer, and the packaging material 1 of FIG. 3 has a glittering printing layer 3a as a printing layer. It has a pattern printing layer 3b in parallel with the pattern printing layer 3b. Further, the packaging material 1 in FIG. 3 has a solid printing layer 3d on the inner layer side of the brilliant printing layer 3a as a printing layer.

Further, the packaging material 1 is used between the plastic film 2 and the printing layer (printing layer having the glittering printing layer 3a) or between the printing layer (printing layer having the glittering printing layer 3a) and the sealant layer 4. , A gas barrier layer (not shown) may be formed.
Specifically, the packaging material of the present invention can exemplify the laminated structure of the following (1) to (4). In the following (1) to (4), the layer on the left side is the outer layer side, and "/" means the boundary of each layer.
(1) Plastic film / Print layer having a glittering print layer / Adhesive layer / Intermediate base material layer / Adhesive layer / Sealant layer (2) Plastic film / Gas barrier layer / Print layer having a glittering print layer / Adhesive Layer / Sealant layer (3) Plastic film / Gas barrier layer / Printing layer with glitter printing layer / Adhesive layer / Intermediate base material layer / Adhesive layer / Sealant layer (4) Plastic film / Printing with glitter printing layer Layer / Adhesive layer / Gas barrier layer / Intermediate base material layer / Adhesive layer / Sealant layer From the viewpoint of making the glittering print layer visible from the outside, it is formed on the outer layer side of the glittering print layer 3a. The layers shall be light transmissive at least in part of the plane of each layer. Further, the gas barrier layers (2) and (3) are a single layer of an inorganic oxide vapor-deposited film or a composite layer in which a gas barrier coating film is formed on the inorganic oxide-deposited film (in the composite layer, inorganic). The oxide film is preferably arranged on the plastic film side). The gas barrier layer (4) is a single layer of a thin-film deposition film or a composite layer in which a gas barrier coating film is formed on the vapor-film deposition film (in the composite layer, the vapor-deposited film is arranged on the intermediate base material layer side). Is preferable.

The packaging material of the present invention needs to satisfy the following condition 1.
<Condition 1>
When the diffused light reflection SCE is measured from the outer layer side of the packaging material and the L ^* value of the L ^* a ^* b ^* color system calculated from the spectral spectrum of the diffused light reflection SCE is L ^* SCE, L ^* SCE Is over 40.

Diffuse light reflection SCE is measured by giving light to the sample surface from all directions using an integrating sphere and opening the light trap corresponding to the specular reflection direction, except for the reflected light emitted from the light trap. It is the reflected light of.
When a person visually recognizes an object, he or she often sees it at an angle where there is no specularly reflected light. Therefore, the diffused ray reflected SCE excluding the specularly reflected light is useful as a parameter for evaluating the appearance of an object. The L ^* value of the L ^* a ^* b ^* color system is an index of brightness. Therefore, it can be said that the L ^* value (L ^* SCE) calculated from the diffused light reflection SCE is useful as an evaluation parameter representing the metallic luster of an object.
The L ^* a ^* b ^* color system was standardized by the International Commission on Illumination (CIE) in 1976, and is adopted in JIS Z8781-4: 2013.

If L ^* SCE is less than 40 and condition 1 is not satisfied, sufficient metallic luster cannot be felt. The L ^* SCE is preferably 45 or more, more preferably 50 or more, and even more preferably 55 or more.
If the L ^* SCE is too large, the content of the glitter pigment becomes excessive, and the coating film strength of the glitter print layer tends to decrease. Therefore, L ^* SCE is preferably 80 or less, and more preferably 75 or less.

A typical SCE measuring device has a configuration conforming to the geometric condition c of JIS Z8722: 2009. More specifically, a typical SCE measuring device uses D65 as the light source of the integrating sphere spectrophotometer, the position of the receiver is +8 degrees with respect to the normal of the sample, and the opening angle of the receiver is It is 10 degrees, the position of the light trap is -8 degrees with respect to the normal of the sample, and the viewing angle is 2 degrees or 10 degrees. In this specification, the viewing angle is set to 10 degrees.
Examples of the measuring device satisfying the above conditions include a handheld spectrophotometer (trade name “CM-700d”) manufactured by Konica Minolta.

In the present specification, L ^* SCE is the average value of the measured values at 20 points.
When the packaging material has light transmittance, for L ^* SCE and mirror gloss, a sample is prepared in which a black plate is bonded to the surface of the packaging material on the sealant layer side via a transparent adhesive layer, and the sample is prepared. It is preferable to measure from the plastic film side of. As the refractive index of the transparent pressure-sensitive adhesive layer of the sample, one having a refractive index difference between the layer on the sealant layer side of the packaging material and the refractive index of the black plate within 0.05 can be used, and the refractive index difference is preferably 0. It is .00. In the present specification, the refractive index means a refractive index having a wavelength of 589 nm.
Further, it is preferable that the 20 points for measuring L ^* SCE and the mirror surface gloss are measured at the same points such as the laminated structure of the packaging material. For example, in the case of the packaging material of FIG. 1, the laminated structure is the same at any location, but in the packaging material of FIG. 2, there are a portion having no pattern printing layer 3b and a portion having a pattern printing layer 3b. .. In such a case, it is preferable to first measure 20 points only at the points that do not have the pattern printing layer 3b. Further, in the packaging material of FIG. 2, measurement may be performed at 20 points only at the place having the pattern printing layer 3b, but in that case, the measurement is performed at the place where the pattern printing layer 3b has substantially the same color and substantially the same density. Is preferable. Further, when a part of the packaging material is subjected to uneven processing such as embossing, it is preferable to measure at 20 points where the uneven processing is performed or 20 points where the uneven processing is not performed. It is preferable to measure the 20 measurement points so that the measurement spots do not overlap, but when the area of the region having the same laminated structure or the like is small, the measurement is performed so that some of the measurement spots overlap. You may.
Further, it is preferable that the laminated structure of the measurement points of L ^* SCE and the laminated structure of the measurement points of the mirror glossiness are the same.
As a result of the measurement as described above, if the laminated structure of the packaging material and the like satisfy the conditions 1 and 2 at least in any one of the same places, it is considered to belong to the scope of the present invention. For example, in the packaging material of FIG. 2, either "measurement results at 20 locations without the pattern printing layer 3b" or "measurement results at 20 locations where the pattern printing layer 3b has substantially the same color and substantially the same concentration". If conditions 1 and 2 are satisfied, it belongs to the scope of the present invention.

The packaging material of the present invention further needs to satisfy the following condition 2.
<Condition 2>
The 60-degree mirror glossiness was measured from the outer layer side of the packaging material in accordance with JIS Z8741: 1997, and the coefficient of variation of the 60-degree mirror glossiness calculated from the measured values was less than 0.100.

The coefficient of variation of the 60-degree mirror surface gloss is obtained by dividing the variation (σ) of the 60-degree mirror surface gloss by the average value of the 60-degree mirror surface gloss.
When the coefficient of variation of the 60-degree mirror surface gloss is 0.100 or more, it means that the uniformity of metallic luster in the surface of the packaging material is low. A general metal has excellent flatness, and the uniformity of metallic luster in the plane is high. Therefore, when the coefficient of variation of the 60-degree mirror surface gloss is 0.100 or more, even if condition 1 is satisfied, the uniformity of the metallic luster in the surface is low, so that the metallic luster has a high level and excellent luxury. I can't feel. That is, even if a predetermined metallic luster is obtained by satisfying the condition 1, if the condition 2 is not satisfied, an excellent design property due to a high level of metallic luster cannot be obtained.

The coefficient of variation of the 60-degree mirror glossiness is preferably 0.080 or less, more preferably 0.070 or less, further preferably 0.060 or less, and preferably 0.050 or less. Even more preferable.
If the coefficient of variation of the 60-degree mirror surface gloss is too small and the uniformity of the metallic luster in the surface is too high, even a slight scratch tends to be noticeable and the yield tends to decrease. Therefore, the coefficient of variation of the 60-degree mirror glossiness is preferably 0.030 or more, and more preferably 0.040 or more.

FIG. 4 is an image view of a cross section of the brilliant printing layer 3a of the packaging material satisfying the condition 2 (cross section of the brilliant printing layer 3a of the embodiment), and FIG. 5 is a brilliant printing of the packaging material not satisfying the condition 2. It is an image figure of the cross section of the layer 3a (the cross section of the brilliant printing layer 3a of the comparative example).
In the cross section of the bright print layer 3a of FIG. 4, the inclination of the bright pigment y is substantially uniform, whereas in the cross section of the bright print layer 3a of FIG. 5, the inclination of the bright pigment y is random. Therefore, the bright print layer 3a in FIG. 4 has a substantially uniform mirror glossiness value and the coefficient of variation of the mirror glossiness is small, whereas the bright print layer 3a in FIG. 5 has a mirror glossiness value. The difference is large, and the coefficient of variation of the mirror glossiness becomes large.

<Plastic film>
The plastic film 2 plays a role as a base material on the outer layer side of the packaging material 1, and is made of a light-transmitting material so that the glittering printing layer 3a can be visually recognized from the outside.
Specifically, polyethylene (PE) -based and polypropylene (PP) -based polyolefin resins, cyclic polyolefin resins, polystyrene resins, acrylonitrile-styrene copolymer (AS) resins, acrylonitrile-butadiene-styrene copolymers. (ABS) resin, poly (meth) acrylic resin, polycarbonate resin, polyvinyl alcohol resin, ethylene-vinyl alcohol copolymer (EVOH), ethylene-vinyl ester copolymer saponified product, polyethylene terephthalate (PET) and poly Polyester-based resins such as butylene terephthalate (PBT) and polyethylene naphthalate (PEN), polyamide-based resins such as various nylons (Ny), polyurethane-based resins, acetal-based resins, cellulose-based resins, polyvinylidene chloride-based resins (PVDC), etc. Can be mentioned. The plastic film may be uniaxially stretched or biaxially stretched. Further, it may be a composite film in which two or more of the above resin films are laminated. These plastic films may be formed by an inflation method or a melt extrusion coating method.

The plastic film preferably has excellent heat resistance from the viewpoint of heating in a microwave oven and retort treatment. Examples of the resin constituting the plastic film having excellent heat resistance include polyester-based resin and polyamide-based resin.
Specific examples of the plastic film having excellent heat resistance include a single polyester film, a single polyamide film such as nylon, and a composite film containing one or more polyester films and polyamide films. Examples of the composite film include PET / Ny / PET and a coextruded stretched film having a composition of PET / Ny from the outer layer side. Further, as the composite film, it is also preferable to combine one or more of polyester film and polyamide film with one or more of ethylene-vinyl alcohol copolymer film and polyvinylidene chloride film.

The thickness of the plastic film is not particularly limited and can be appropriately set depending on the intended use of the packaging material, but is usually preferably about 5 to 50 μm, more preferably 10 to 40 μm, still more preferably. Is 12 to 25 μm.

The total light transmittance of JIS K7361-1: 1997 is preferably 85% or more, and more preferably 90% or more for the plastic film. The haze of JIS K7136: 2000 is preferably 1.0% or less, more preferably 0.5% or less, and even more preferably 0.3% or less for the plastic film.

Both surfaces of the plastic film preferably have an arithmetic mean roughness Ra of 0.1 μm or less, more preferably 0.05 μm or less, at a cutoff value of 0.8 mm measured according to JIS B0601: 1994. .. By setting Ra on both surfaces of the plastic film to the above-mentioned range, the designability can be further improved.

<Print layer>
The packaging material of the present invention has a printing layer on the inner layer side of the plastic film. Further, the packaging material of the present invention has a brilliant printing layer containing a brilliant pigment and a binder resin as a printing layer.
The printing layer may be provided on the entire surface of the packaging material, or may be provided only on a part of the packaging material. Examples of the printing layer other than the brilliant printing layer include a pattern printing layer and a solid printing layer.

<< Bright print layer >>
The glittering printing layer 3a may be provided on the entire surface of the packaging material as shown in FIGS. 1 and 2, or may be provided only on a part of the packaging material as shown in FIG. .. Further, as shown in FIG. 2, the pattern printing layer 3b may be provided on a part of the outer layer side of the brilliant printing layer 3a. Further, as shown in FIG. 3, the glitter printing layer 3a and the pattern printing layer 3b may be provided in parallel at the same position in the thickness direction of the packaging material.
Further, a pattern such as a character, a figure, a symbol, a pattern, or a pattern may be formed by the glittering printing layer 3a.

The thickness of the brilliant print layer is preferably 0.1 to 8.0 μm, more preferably 0.3 to 5.0 μm, from the viewpoint of allowing the metallic luster to be sufficiently impressed. ..

The glitter pigment preferably contains one or more selected from metal scales and pearl pigments.

Examples of the pearl pigment include white pearl pigment, interference pearl pigment, colored pearl pigment and the like. Pearl pigments are suitable because they tend to improve the microwave resistance of the packaging material.

The white pearl pigment is obtained by covering a scale-like base material such as mica, aluminum, and glass with a coating layer made of a colorless high refractive index material such as titanium dioxide, and the thickness of the coating layer is 0.1 to 0. It is relatively small, about 15 μm, and reflects almost all wavelengths of light, so it looks white or silver.
In the interference pearl pigment, the coating layer is a colorless high refractive index material such as titanium dioxide, and the thickness of the coating layer is larger than that of the white pearl pigment, which is more than 0.15 μm. Depending on this thickness, the reflected light and the transmitted light change, and various interference colors are generated. Sometimes called iridescent pearls.
The colored pearl pigment is chromatic and the coating layer is a colored high refractive index material such as ferric oxide, and the periphery of the white pearl pigment is further colored high refractive index material such as ferric oxide or other colored material. There are those coated with a pigment, or those in which a pigment or other colorant is added to the coating layer.

The average length of the pearl pigment is preferably 5 to 70 μm, more preferably 10 to 40 μm.
The average length of the pearl pigment and the average length of the metal scales are the average values of the lengths of any 20 particles (pearl pigment or metal scales) observed with an optical microscope or an electron microscope from the plane direction of the packaging material. Is required as. The length of one pearl pigment and the metal scale means the maximum length of one pearl pigment and the metal scale in the plane direction.

The average thickness of the pearl pigment is preferably 0.01 to 1 μm, more preferably 0.02 to 0.7 μm, and even more preferably 0.05 to 0.5 μm.
The average thickness of the pearl pigment and the metal scale is determined as the average value of the thickness of any 20 particles (pearl pigment or metal scale) obtained by observing the cross section of the packaging material with an optical microscope or an electron microscope. The thickness of one pearl pigment and metal scale is obtained by dividing a cross-sectional image of one pearl pigment and metal scale into five regions having uniform lengths in the length direction, and the thickness of the central portion of each region ( It means that t ₁ , t ₂ , t ₃ , t ₄ , t ₅ ) are measured and t ₁ to t ₅ are averaged.

The content of the pearl pigment in the brilliant print layer is preferably 40 to 90% by mass, more preferably 50% by mass, of the total solid content of the brilliant print layer from the viewpoint of increasing the coating film strength while satisfying the condition 1. It is ~ 85% by mass, more preferably 60-80% by mass.

Examples of the material of the metal scale include metals and alloys such as aluminum, gold, silver, brass, titanium, chromium, nickel, nickel chromium, and stainless steel.
The metal scale is obtained, for example, obtained by peeling a metal thin film formed by vacuum-depositing the metal or alloy on a plastic film from the plastic film, crushing and stirring the peeled metal thin film, or a powder of the metal or alloy. And a solvent are mixed, and the powder obtained by spreading and / or pulverizing the powder with a medium stirring mill, a ball mill, an attritor or the like, or a resin-coated surface thereof can be used. it can.

The metal scale is preferably a non-leaving type metal scale. In the non-leaving type metal scales, the metal scales are uniformly dispersed in the layer during the formation process of the bright printing layer, so that the distance between the metal scales may be narrowed even if the metal scales are tilted in the bright printing layer. Since it is suppressed, it is possible to suppress the generation of sparks and the heat generation of the packaging material when heated in a microwave oven.
Non-leafing type metal scales are metal scales that have not been surface-treated with stearic acid. One piece etc. can be mentioned.

The metal scales preferably have a resin-coated surface of the metal scales. The resin-coated metal scales suppress the narrowing of the spacing between the metal scales even if the metal scales are tilted in the bright printing layer, so that sparks and heat generation of the packaging material when heated in a microwave oven are generated. Can be suppressed.
The resin-coated metal scales can be produced, for example, by the methods described in JP-A-62-253668, JP-A-64-450566, JP-A-2003-213157, and JP-A-2012-241039. ..

The metal scales preferably have an average length of 1 to 50 μm, more preferably 2 to 40 μm, still more preferably 5 to 30 μm, from the viewpoint of uniform dispersibility in the glittering printed layer. Further, from the viewpoint of obtaining handleability and high metallic luster, the average thickness is preferably 0.01 to 5 μm, more preferably 0.02 to 3 μm, and further preferably 0.05 to 1 μm.

The content of the metal scales in the brilliant printing layer shall be 3% by mass or more and 50% by mass or less of the total solid content of the brilliant printing layer from the viewpoint of improving the microwave oven resistance while satisfying the condition 1. It is more preferable that it is 3% by mass or more and less than 40% by mass, and further preferably 10% by mass or more and 30% by mass or less.

The aspect ratio (average length / average thickness) of the pearl pigment and the bright pigment such as metal scales is preferably 25 or more, and more preferably 40 or more. By setting the aspect ratio of the bright pigment to 20 or more, the bright pigment is less likely to tilt in the bright print layer, and the condition 2 can be easily satisfied.
Further, the aspect ratio of the bright pigment is preferably 400 or less, more preferably 200 or less. When the bright pigment is a metal scale, by setting the aspect ratio to 400 or less, when the metal scale is tilted, it becomes difficult for the adjacent metal scales to come into contact with each other, and the microwave oven resistance can be improved.

Examples of the binder resin in the brilliant printing layer include polyolefin resins such as polyethylene resins and chlorinated polypropylene resins, poly (meth) acrylic resins, polyvinyl chloride resins, polyvinyl acetate resins, and vinyl chloride-. Vinyl acetate copolymer, polystyrene resin, styrene-butadiene copolymer, vinylidene fluoride resin, polyvinyl alcohol resin, polyvinyl acetal resin, polyvinyl butyral resin, polybutadiene resin, polyester resin, polyamide resin, Alkid resin, epoxy resin, unsaturated polyester resin, thermosetting poly (meth) acrylic resin, melamine resin, urea resin, polyurethane resin, phenol resin, xylene resin, maleic acid resin, nitro Examples thereof include fibrous resins such as cellulose, ethyl cellulose, acetylbutyl cellulose and ethyloxyethyl cellulose, rubber resins such as rubber chloride and cyclized rubber, petroleum resins, natural resins such as rosin and casein. These may be used alone or in combination of two or more.

A colorant may be contained in the brilliant print layer in order to enhance the design.
As the colorant, general-purpose dyes and pigments (for example, inorganic pigments such as yellow lead, titanium yellow, petals, cadmium red, ultramarine blue, cobalt blue, and organic pigments such as quinacridone red, isoindolinone yellow, and phthalocyanine blue) are used. Can be used. From the viewpoint of microwave oven resistance, it is preferable to use a very small amount of a colorant having low insulating properties such as carbon black.
When the colorant is a pigment, the average particle size is preferably 250 nm or less from the viewpoint of suppressing diffusion by the colorant and maintaining metallic luster. The average particle size of the pigment is determined as the mass average value d50 in the particle size distribution measurement by the laser light diffraction method.

The content of the colorant is preferably 10 to 70 parts by mass, more preferably 20 to 60 parts by mass, and further preferably 30 to 50 parts by mass with respect to 100 parts by mass of the bright pigment. preferable.

It is preferable that the glittering printed layer contains inorganic particles having an average particle diameter of 1 to 100 nm (hereinafter, may be referred to as “inorganic fine particles”).
By containing the inorganic fine particles in the brilliant printing layer, the brilliant pigment is suppressed from sinking below the brilliant printing layer, and the brilliant pigment is easily uniformly arranged in the brilliant printing layer. Condition 2 can be easily satisfied.
The average particle size of the inorganic fine particles is more preferably 2 to 50 nm, and even more preferably 5 to 30 nm. The average particle size of the inorganic fine particles is determined as the mass average value d50 in the particle size distribution measurement by the laser light diffraction method.

The content of the inorganic fine particles in the bright printing layer is preferably 10 to 70 parts by mass, more preferably 15 to 50 parts by mass, and 20 to 35 parts by mass with respect to 100 parts by mass of the bright pigment. It is more preferably a part.

Examples of the inorganic fine particles include silica, alumina, zirconia and titania. Among these, silica having excellent transparency is preferable. Further, since silica and alumina are excellent in insulating properties, they are also preferable in that they can improve microwave oven resistance.

The glittering printed layer may contain, for example, a light stabilizer such as a filler, a stabilizer, a plasticizer, an antioxidant, an ultraviolet absorber, a dispersant, a thickener, a desiccant, a lubricant, and an antistatic agent. Any additive such as an agent or a cross-linking agent can be added.

<< Picture printing layer >>
The packaging material of the present invention may have a pattern printing layer 3b as a printing layer. The pattern printing layer 3b may be formed, for example, on the outer layer side of the brilliant printing layer 3a (FIG. 2) or may be formed in parallel with the brilliant printing layer 3a at the same position in the thickness direction of the packaging material. It can be done (Fig. 3). In addition, in order to prevent the arrangement of the glitter pigments from being disturbed by the solvent contained in the coating liquid for forming the pattern print layer, the pattern print layer may be formed in parallel with the glitter print layer or may be formed as an outer layer of the glitter print layer. It is preferable to form it on the side.

The picture print layer 3b is preferably a print layer formed from a color that can be distinguished from the glitter print layer 3a, and is a broad concept including characters, figures, symbols, patterns, patterns, solid printing, and the like. The colorant of the pattern printing layer 3b is a general-purpose dye and pigment (for example, an inorganic pigment such as yellow lead, titanium yellow, valve pattern, cadmium red, ultramarine blue, cobalt blue, quinacridone red, isoindolinone yellow, phthalocyanine blue, etc. Organic pigments) can be used.
The thickness of the pattern printing layer is not particularly limited, and is usually about 0.1 to 5 μm, preferably 1.0 to 5 μm, and more preferably 1.0 to 3 μm.

Further, as shown in FIG. 2, the pattern printing layer 3b is formed on the outer layer side of the brilliant printing layer 3a, and the pattern printing layer 3b is configured to have light transmission so that a metallic luster is felt. It is preferable in that it can increase the color and improve the design.
As a means for increasing the color of the portion where the metallic luster is felt, a means for adding a colorant to the glittering printing layer can be mentioned, but a pattern printing layer having light transmission is provided on the outer layer side of the glittering printing layer. The means of forming is preferred. In the means for forming the pattern printing layer having light transmission on the outer layer side of the glittering printing layer, most of the colorants are almost certainly exposed to the outside light, and the light reflected by the glittering printing layer regenerates the pattern printing layer. Since it passes through, the amount of the colorant used when trying to impart the same color can be reduced. In addition, since the pattern printing layer usually expresses color with a plurality of colorants, the light reflected by the brilliant printing layer is configured to re-pass through the pattern printing layer so that the light is evenly applied to each colorant. It is preferable in that it can be hit and color unevenness can be suppressed. Further, the means for forming the pattern printing layer having light transmission on the outer layer side of the bright printing layer is also suitable in that the content of the bright pigment in the bright printing layer can be easily increased.

The colorants of the pattern printing layer having light transmission are general-purpose dyes and pigments (for example, yellow lead, titanium yellow, petals, inorganic pigments such as cadmium red, ultramarine blue, cobalt blue, quinacridone red, isoindolinone yellow, etc. Organic pigments such as phthalocyanine blue).
Since the dye absorbs light of a specific wavelength, there is a concern that the intensity of light emitted by the anti-glitter printing layer by the brilliant printing layer may be reduced. Further, since the pigment having a large average particle size has strong diffusion, there is a concern that the metallic luster may be lowered.
Therefore, the colorant of the pattern printing layer having light transmission is preferably a pigment having an average particle diameter of 100 nm or more and less than 380 nm. The average particle size of the pigment can be measured by a laser light scattering method.

The content of the colorant in the pattern printing layer having light transmission is preferably 3 to 50 parts by mass, more preferably 5 to 20 parts by mass, and 7 to 20 parts by mass with respect to 100 parts by mass of the binder resin. It is more preferably 15 parts by mass.
The thickness of the pattern printing layer having light transmission is preferably 0.1 to 1.0 μm, more preferably 0.1 to 0.6 μm, and further preferably 0.2 to 0.4 μm.

<< Solid print layer >>
The packaging material of the present invention may have a solid printing layer 3d as a printing layer. As shown in FIG. 3, the solid printing layer is preferably formed on the inner layer side of the brilliant printing layer 3a.
By forming the solid printing layer, the appearance of the packaged object can be improved depending on the type of the packaged object and the like. The color of the solid print layer is not particularly limited, but it is preferably white, which does not impair the color of the brilliant print layer and has excellent hiding power. That is, the solid printing layer is preferably a white solid printing layer. The white solid printing layer may contain a small amount of dyes and pigments other than the white pigment as a colorant in order to adjust the color.

The solid printing layer may be formed only on a part of the surface of the packaging material, but from the viewpoint of facilitating the above-mentioned effect, it is formed on the entire surface of the packaging material as shown in FIG. Is preferable.
As the colorant for the solid printing layer, a general-purpose colorant can be used. In the case of a white solid printing layer, it is preferable to use at least one colorant selected from titanium oxide such as titanium dioxide, barium sulfate, magnesium oxide, calcium carbonate, zinc oxide, and white pigment such as white lead.
The thickness of the solid printing layer is not particularly limited, and is preferably about 1.0 to 5 μm, more preferably 1.0 to 3 μm.

<Adhesive layer>
The adhesive layer is arranged adjacent to the inner layer side of the print layer.
It is preferable that the adhesive layer is formed on a member different from the printing layer and then dry-laminated on the printing layer. For example, in the case of FIGS. 1 to 3, it is preferable to form the adhesive layer 6a on the intermediate base material 5 and then dry-laminate the adhesive layer 6a on the printing layer (printing layer having a brilliant printing layer). When there is no intermediate base material, it is preferable to form an adhesive layer on the sealant layer and then dry-laminate the adhesive layer on a printing layer (a printing layer having a brilliant printing layer). It is also preferable to form an adhesive layer on the inner layer side of the print layer (print layer having a brilliant print layer) by a transfer method. As a specific example of the transfer method, an adhesive layer is formed on a base material having releasability, and the adhesive layer is dry-laminated on a printing layer (a printing layer having a brilliant printing layer) and then releasable. A means for peeling off the base material can be mentioned.
As described above, by dry-laminating the adhesive layer on the print layer, the solvent of the coating liquid for forming the adhesive layer permeates into the bright print layer of the print layer, and the arrangement of the bright pigment may be disturbed. It is suppressed and the condition 2 can be easily satisfied.

Examples of the dry laminating adhesive include polyvinyl acetate adhesives, polyacrylic acid ester adhesives, cyanoacrylate adhesives, ethylene copolymer adhesives, cellulose adhesives, polyester adhesives, and polyamide adhesives. Adhesives, polyimide adhesives, amino resin adhesives such as urea resin and melamine resin, phenol resin adhesives, epoxy adhesives, polyurethane adhesives (for example, cured products of polyols and isocyanate compounds), reactions Examples thereof include mold (meth) acrylic acid-based adhesives, rubber-based adhesives such as chloroprene rubber, nitrile rubber, and styrene-butadiene rubber, silicone-based adhesives, and inorganic adhesives such as alkali metal silicate and low-melting point glass.

The adhesive layer can be arranged at yet another position in addition to the position adjacent to the inner layer side of the print layer.
For example, as shown in FIGS. 1 to 3, an adhesive layer may be arranged between the intermediate base material 5 and the sealant layer 4.

The thickness of the adhesive layer is preferably 0.5 to 100 μm, more preferably 1 to 50 μm.

<Sealant layer>
The sealant layer 4 has a surface on the inner layer side that comes into direct contact with the packaged object and plays a role of protecting the packaged object. In particular, when the packaging material 1 forms a packaging container for a liquid material, the sealant layer 4 is preferably made of a material that does not allow the liquid material to permeate. Further, it is preferable that the innermost layer of the sealant layer 4 has a heat-sealing property for pouching.

Examples of the material constituting the sealant layer 4 include low density PE (LDPE), linear low density PE (LLDPE), medium density PE (MDPE), high density PE (HDPE), and an ethylene-vinyl acetate copolymer. , Polyethylene homopolymer, ethylene-propylene block copolymer, polyethylene-propylene random copolymer and other polyolefin-based resins, and one or more of these resins can be used. The sealant layer 4 may be composed of a single layer or may be composed of two or more layers. The sealant layer is preferably a non-stretched film made of the above-mentioned resin in order to suppress shrinkage during heat sealing.

From the viewpoint of heating in a microwave oven and retort treatment, the sealant layer is preferably composed of a resin having excellent heat resistance in order to improve heat resistance. Specifically, propylene homopolymer and ethylene-propylene block copolymer weight Combined, propylene resins such as ethylene-propylene random copolymers and HDPE are preferred.
Further, it is preferable to use the propylene-based resin properly according to the purpose. Specifically, an ethylene-propylene block copolymer is preferable when cold resistance is important (for example, packaging material for frozen foods), and an ethylene-propylene random copolymer is preferable when transparency is important, and heat resistance is high. A propylene copolymer is preferable when sex is emphasized. Further, in the case of a container provided with an automatic ventilation mechanism, an ethylene-propylene block copolymer is preferable from the viewpoint that steam can be easily released by lowering the sealing strength at a high temperature.

Further, when the lid body of the container with a lid is formed by the packaging material 1, the sealant layer 4 preferably has an easy peel property.
The easy peeling property is, for example, that when the sealant layer 4 of the packaging material 1 of the lid of the container with a lid is joined to the container body, the lid is easily peeled off from the container body when the container with the lid is opened. Say.
The sealant layer having easy peeling property uses two or more kinds of resins, and one resin (resin having good adhesion to the container body) and another resin (adhesion to the container body is not good, and the above-mentioned It can be formed by mixing one resin and an incompatible resin). Since such a resin differs depending on the material of the container, it cannot be said unconditionally, but when the container is made of PP, PP, which is one resin (resin having good adhesion to the container body), and another By forming a sealant layer from a resin obtained by mixing one or more selected from PE, polybutene, and polystyrene, which are resins (resins that do not have good adhesion to the container body and are incompatible with the above-mentioned resin), Easy peelability can be imparted to a container made of PP.
The sealant layer may have a multi-layer structure, and easy peeling property may be imparted only to the side of the sealant layer to be joined to the container body (the innermost layer in the packaging material).

The thickness of the sealant layer 4 is not particularly limited and is appropriately set according to the use of the packaging material 1 and the type and properties of the object to be packaged, but is usually preferably about 10 to 200 μm. Further, in the case of a pouch (particularly a retort pouch), the thickness of the sealant layer 4 is more preferably 20 to 150 μm, still more preferably 30 to 100 μm. In the case of a container with a lid, the thickness of the sealant layer 4 is more preferably 15 to 80 μm, still more preferably 20 to 60 μm.

<Gas barrier layer>
The gas barrier layer can be provided between the plastic film 2 and the sealant layer 4, if necessary. The gas barrier layer plays a role of blocking the permeation of oxygen, water vapor, etc. between the object to be packaged by the packaging material 1 and the external environment of the packaging material 1. Further, it may be provided with a light-shielding property that blocks the transmission of visible light, ultraviolet rays, and the like. The gas barrier layer may be composed of only one layer or may be composed of a plurality of layers of two or more layers.
When the gas barrier layer is formed on the outer layer side of the brilliant print layer 3a, it is made of a light-transmitting material so that the brilliant print layer 3a can be visually recognized from the appearance like the plastic film 2. ..

The gas barrier layer can be formed as a vapor deposition film or a coating film by a known method. The surface on which the gas barrier layer is formed may be surface-treated in advance from the viewpoint of improving the adhesion of the gas barrier layer. Examples of the surface treatment include corona discharge treatment, ozone treatment, low temperature plasma treatment using oxygen gas, nitrogen gas, etc., glow discharge treatment, oxidant treatment, application of an anchor coating agent, and the like.

[Embedded film]
Examples of the vapor deposition film which is an example of the gas barrier layer include silicon (Si), aluminum (Al), magnesium (Mg), calcium (Ca), potassium (K), tin (Sn), sodium (Na), and boron (. It can be formed from inorganic substances such as B), titanium (Ti), lead (Pb), zirconium (Zr), and yttrium (Y), or oxides thereof. Among these, when the packaging material is for a microwave oven, silicon oxide, aluminum oxide, magnesium oxide, etc. can be sufficiently heated by microwaves of the microwave oven. Inorganic oxides such as are preferable.
Examples of the method for forming the vapor deposition film include physical vapor deposition (PVD) methods such as vacuum vapor deposition, sputtering, and ion plating, and chemical vapor deposition (CVD) such as plasma chemical vapor deposition, thermochemical vapor deposition, and photochemical vapor deposition. Law etc. can be mentioned.
The vapor-deposited film arranged on the outer layer side of the print layer having the brilliant print layer is preferably an inorganic oxide-deposited film from the viewpoint of visibility of the print layer.

The film thickness of the vapor-deposited film varies depending on the forming material, the required gas barrier performance, and the like, but is usually preferably about 5 to 200 nm, more preferably 5 to 150 nm, and further preferably 10 to 100 nm. In the case of an inorganic oxide such as a silicon oxide or an aluminum oxide, it is preferably about 5 to 100 nm, more preferably 5 to 50 nm, and further preferably 10 to 30 nm.

[Gas barrier coating film]
As an example of the gas barrier coating film, which is an example of the gas barrier layer, for example, the general formula R ¹ _n M (OR ² ) _m (in the formula, R ¹ and R ² are organic groups having 1 to 8 carbon atoms, and M is a metal atom. There are at least one alkoxide represented by (n is an integer of 0 or more, m is an integer of 1 or more, and n + m is the atomic value of M), a polyvinyl alcohol-based resin and / or ethylene-vinyl. A coating solution obtained by polycondensing the alcohol copolymer by the sol-gel method in the presence of a sol-gel method catalyst, acid, water and an organic solvent is applied, and the temperature is 0 to 300 ° C. It can be formed by heat treatment for 05 to 60 minutes.
The coating method can be, for example, a roll coating such as a gravure roll coater, a spray coating, a spin coating, dipping, a brush, a bar coating, an applicator or the like. The dry film thickness of the coating film is preferably about 0.01 to 30 μm, more preferably 0.05 to 20 μm, and even more preferably 0.1 to 10 μm after one or more coatings.
The gas barrier coating film is preferably formed on the surface of the vapor deposition film from the viewpoint of improving the gas barrier property.

As the packaging material having a gas barrier layer, for example, the following laminated configurations (1') to (6') can be exemplified. In the following (1') to (6'), the left layer is the outer layer side, and "/" means the boundary of each layer.
(1') Plastic film / Inorganic oxide vapor deposition film / Print layer with glitter printing layer / Adhesive layer / Sealant layer (2') Plastic film / Inorganic oxide vapor deposition film / Gas barrier coating film / Brightness Print layer with print layer / adhesive layer / sealant layer (3') Plastic film / print layer with glitter print layer / adhesive layer / vapor deposition film / intermediate base material layer / adhesive layer / sealant layer (4') ) Plastic film / Print layer with glitter printing layer / Adhesive layer / Gas barrier coating film / Vapor deposition film / Intermediate base material layer / Sealant layer (5') Plastic film / Vapor deposition film of inorganic oxide / Glossy printing layer Printing layer / adhesive layer / intermediate base material layer / adhesive layer / sealant layer (6') plastic film / inorganic oxide vapor deposition film / gas barrier coating film / printing layer having a glittering printing layer / adhesive Layer / Intermediate base material layer / Adhesive layer / Sealant layer The vapor-deposited films of (3') and (4') are preferably inorganic oxide vapor-deposited films.

<Intermediate base material layer>
The intermediate base material layer is used as necessary for the purpose of improving the strength of the packaging material 1, improving the processing suitability, changing the texture of the packaging material, or using it as a base material for forming another layer. It is a layer provided. Examples of the constituent material of the intermediate base material layer include a plastic film and paper.
In the case of a plastic film, the same one as the above-mentioned plastic film formed on the outer layer side of the brilliant print layer 3a can be used.
In the case of paper, characteristics such as shapeability, bending resistance, and rigidity can be imparted to the packaging material 1, for example, high-size bleached or unbleached kraft paper, pure white roll paper, paperboard, and various types. Processed paper, etc. can be used. The basis weight of the paper is usually preferably about 50 to 600 g / m ² , more preferably 60 to 500 g / m ² , and even more preferably 70 to 450 g / m ² . When the packaging material 1 is used for flexible packaging, it is preferably less than 150 g / m ² , and when it is used for paper containers such as paper cups and liquid paper containers, it is preferably 200 g / m ² or more.

In consideration of heating in a microwave oven and retort treatment, the intermediate base material layer preferably has excellent heat resistance in order to increase the heat resistance of the packaging material. Specific examples of the intermediate base material layer having excellent heat resistance include paper and various plastic films exemplified as plastic films having excellent heat resistance.

<Thermosetting resin layer>
As shown in FIG. 9, the packaging material 1 may have the thermosetting resin layer 7 in a part of the region between the plastic film and the sealant layer.
As shown in FIG. 9, the heat-softening resin layer 7 is formed in a part near the edge of the packaging material 1, and the heat-softening resin layer has a predetermined strength in a temperature environment of room temperature or lower. By being composed of a resin whose predetermined strength decreases in a high temperature environment, when the pressure inside the packaging container rises due to heating in a microwave oven, a part of the sealant layer is destroyed and the heat-softening resin layer is formed. Part of the air can be separated from the interface or coagulated and broken, allowing steam to escape. Details will be described in the second embodiment of the automatic ventilation mechanism.

A heat-softening resin, that is, a resin having a predetermined strength in a temperature environment below room temperature but having a predetermined strength in a high temperature environment, has a melting point of 60 to 110 ° C., preferably a melting point of 60 to 90 ° C. Examples thereof include an ethylene-vinyl acetate copolymer resin, polyamide, nitrified cotton and polyethylene wax, and a mixed resin of polyamide, nitrified cotton and polyethylene wax is preferable. As the resin containing polyamide, nitrocellulose and polyethylene wax, MWOP varnish (softening point: 105 ° C.) manufactured by DIC Graphics Corporation can be used.

The thickness of the thermosetting resin layer is preferably 1 to 5 μm. By setting the thickness of the thermosetting resin layer to 1 μm or more, the thermosetting resin layer and the sealant layer can be easily destroyed when heated in a microwave oven. Further, by setting the thickness of the thermosetting resin layer to 5 μm or less, when the film-shaped packaging material is rolled into a roll shape, a swelling occurs in a part thereof, and the stretching of the packaging material in that part can be suppressed.

The packaging material 1 may have a heat-generating printing layer in a part of the area between the plastic film and the sealant layer. With this configuration, the temperature rises faster in the region with the heat-generating print layer (heat-generating region) than in the region without the heat-generating printing layer (non-heating region), so that the heat-generating region in the heat-sealed portion The sealed state of the corresponding portion is eliminated, and automatic steaming can be performed (second embodiment B of the automatic steaming mechanism).

The heat-generating printing layer is a printing layer containing a conductive agent.
Examples of the conductive agent include one or more selected from conductive polymers and conductive particles.
Examples of the conductive polymer include polyaniline, polythiophene and polyacetylene. Examples of the conductive particles include carbon black and metal particles.
When conductive particles are used as the conductive agent, the heat-generating printing layer preferably contains a binder resin. Further, when a conductive polymer is used as the conductive agent, another resin may be contained in order to adjust the conductivity.
As the resin other than the conductive polymer of the heat-generating printing layer, the same resin as that exemplified as the binder resin of the glittering printing layer can be used.

The thickness of the heat-generating printing layer is preferably 0.1 μm or more, more preferably 0.5 to 10 μm. Further, the area of the heat generating region is preferably 1 mm ² or more, and more preferably 5 mm ² or more. The upper limit of the area of the heat generating region is not particularly limited, and may be appropriately adjusted according to the form of the packaging material.
Further, the heat-generating printing layer preferably has a resistance value of 0.1 kΩ to 50 kΩ measured with a distance of 5 mm between the terminals of the tester.

<Transparent matte layer>
The packaging material of the present invention may have a transparent matte layer on a part of the surface of the plastic film opposite to the glittering printing layer. By having the transparent mat layer, it is possible to improve the design by the gloss mat effect and suppress the slippage of the hand when opening the packaging container.

In order to prevent hand slippage when opening the packaging container, the transparent matte layer is a surface opposite to the glitter printing layer of the plastic film, and is provided on at least a part of the surface near the edge of the surface. It is preferably formed. The vicinity of the edge means a region within 3 mm from the edge of the packaging material.
From the viewpoint of further suppressing slippage, it is preferable to further emboss the portion where the transparent matte layer is formed.

The transparent mat layer preferably contains a matting agent and a binder resin.
As the matting agent, particles made of an inorganic substance such as silica, alumina, calcium carbonate, aluminosilicate, and barium sulfate are preferable. Among these, silica having excellent transparency is preferable.
Examples of the shape of the matting agent include spherical shape, polyhedron, scaly shape, and amorphous shape. Among these, an amorphous shape is preferable from the viewpoint of suppressing slippage.

The average particle size of the matting agent is preferably 0.1 to 15.0 μm, more preferably 1.0 to 10.0 μm, still more preferably 2.0 to 7.5 μm. It is even more preferably 7 to 5.0 μm. The average particle size of the particles of the matting agent is measured as a mass average value d50 in the particle size distribution measurement by the laser light diffraction method.

The matting agent preferably has an oil absorption of 250 [g / 100 g] or more. By using a matting agent with an oil absorption amount of 250 [g / 100g] or more, the matting agent absorbs water and it becomes difficult for a thin film of water to be formed on the surface of the transparent matte layer, so that the hand slips wet with water. It can be easily suppressed.
The oil absorption of the matting agent is preferably 270 [g / 100 g] or more, and more preferably 280 [g / 100 g] or more.
The upper limit of the oil absorption amount of the matting agent is not particularly limited, but if the oil absorption amount is too large, the cohesiveness of the matting agent becomes too strong and it becomes difficult to control the matte feeling, so that it may be 600 [g / 100 g] or less. It is more preferably 500 [g / 100 g] or less, and even more preferably 400 [g / 100 g] or less.
The oil absorption amount was measured by JIS K5101-13-2 "Pigment Test Method-Part 13: Oil Absorption Amount-Section 2: Boiled Amani Oil Method".

The content ratio of the matting agent to the total solid content of the transparent mat layer is preferably 2.0 to 50.0% by mass, more preferably 5.0 to 40.0% by mass, and 15.0 to 15.0 to 15.0 to 40.0% by mass. It is more preferably 30.0% by mass.

As the binder resin for the transparent mat layer, a general-purpose thermoplastic resin or curable resin can be used, and it is preferable to use a two-component curable resin. As the two-component curable resin, a two-component curable resin containing a polyol and an isocyanate is preferable.

The thickness of the transparent mat layer is preferably 1.0 to 15.0 μm, more preferably 1.5 to 10.0 μm, and even more preferably 1.8 to 6.0 μm.

Although the packaging material of the present invention described above can be used for various packaging materials, it can be suitably used for packaging materials for foods and cosmetics because it can impress the purchaser with a high-class feeling of the contents. ..

[Packaging container]
The packaging container of the present invention is at least partially formed of the above-mentioned packaging material of the present invention.
By forming at least a part of the packaging container with the packaging material of the present invention, a high-quality packaging container due to metallic luster can be obtained even if the metal itself is not used.
The packaging material of the present invention may be applied to a desired portion of the packaging container to which a feeling of luxury due to metallic luster is desired, and the entire packaging container may be formed of the packaging material, or only a part thereof. The packaging material may be used for.

The type and use of the packaging container of the present invention are not particularly limited, but can impress the purchaser with a sense of luxury of the contents when selling the contents contained in the packaging container. Yes, for example, it can be suitably used for food containers, cosmetic containers, and the like.
Examples of the packaging container include a pouch and a container with a lid, as well as a cup and a tray. These packaging containers include the above-mentioned packaging materials in part. That is, these packaging containers may be formed of a packaging material containing paper as an intermediate base material layer.
Specific examples of the shape of the pouch include the shape of the pouch for a microwave oven shown in FIG. 6, which will be described later. The pouch may be a retort container (a container that has been sterilized at high temperature and high pressure), and may be a packaging container for a microwave oven or a container other than the retort container.
As a specific shape of the container with a lid, a container body having an accommodating portion and a lid body joined to the container body so as to seal the accommodating portion are provided, and the lid body is said to be said. Examples thereof include those formed of a packaging material.
As described above, the packaging container can be suitably used for a microwave oven. The packaging container can also be used as a retort container. Of course, the packaging container can also be used as a retort container for a microwave oven.

When the packaging container is a container for a microwave oven or a retort container, the packaging material constituting the container preferably has a laminated structure according to any one of (1) to (4) described above.
At this time, as the plastic film, it is preferable to use a single polyester film, a single polyamide film such as nylon, a polyester film, and a composite film containing one or more of the polyamide films.
At this time, as the intermediate base material, it is preferable to use a single polyester film, a single polyamide film such as nylon, a composite film containing one or more of the polyester film and the polyamide film, and paper.
At this time, as the sealant layer, a propylene resin such as a propylene homopolymer, an ethylene-propylene block copolymer, or an ethylene-propylene random copolymer, or HDPE is preferable.
More specifically, in the case of a retort container or a container for a microwave oven, it is preferable that the packaging material constituting the container has a laminated structure according to any one of the following (A1) to (A14). In addition, "/" means the boundary of each layer. Further, in (A1) to (A14), PET is preferably a stretched film. In addition, ONy means stretched nylon.

(A1) PET / Print layer having a glittering printing layer / Adhesive layer / ONy / Adhesive layer / Ethylene-propylene block copolymer (A2) PET / Gas barrier layer / Printing layer having a glittering printing layer / Adhesive Layer / ONy / Adhesive layer / Ethylene-propylene block copolymer (A3) PET / Print layer with glitter printing layer / Adhesive layer / Gas barrier layer / ONy / Adhesive layer / Ethylene-propylene block copolymer ( A4) PET / print layer with glitter print layer / adhesive layer / PET / adhesive layer / ethylene-propylene block copolymer (A5) PET / gas barrier layer / print layer with glitter print layer / adhesive layer / PET / Adhesive layer / Ethylene-propylene block copolymer (A6) PET / Print layer with glitter printing layer / Adhesive layer / Gas barrier layer / PET / Adhesive layer / Ethylene-propylene block copolymer (A7) ) Co-extruded stretched film (PET / Ny / PET) / Print layer with glitter printing layer / Adhesive layer / PET / Adhesive layer / Ethylene-propylene block copolymer (A8) Co-extruded stretched film (PET / Ny) / PET) / Gas barrier layer / Print layer with brilliant print layer / Adhesive layer / PET / Adhesive layer / Ethylene-propylene block copolymer (A9) coextruded stretched film (PET / Ny / PET) / Glitter Printing with printing layer / Adhesive layer / Gas barrier layer / PET / Adhesive layer / Ethylene-propylene block copolymer (A10) co-extruded stretched film (PET / Ny) / Gas barrier layer / Printing with glittering printing layer Layer / Adhesive Layer / PET / Adhesive Layer / Ethylene-propylene Block Copolymer (A11) Coextruded Stretched Film (PET / Ny) / Printing Layer with Glittering Printing Layer / Adhesive Layer / Gas Barrier Layer / PET / Adhesive layer / Ethylene-propylene block copolymer (A12) PBT / Print layer with glitter printing layer / Adhesive layer / ONy / Adhesive layer / Ethylene-propylene block copolymer (A13) PBT / Gas barrier layer / Printing layer with glitter printing layer / adhesive layer / ONy / adhesive layer / ethylene-propylene block copolymer (A14) PBT / printing layer with glitter printing layer / adhesive layer / gas barrier layer / ONy / adhesion The gas barrier layer of the agent layer / ethylene-propylene block copolymer A2, 5, 8, 10 and 13 forms a gas barrier coating film on a single layer of an inorganic oxide vapor deposition film or an inorganic oxide vapor deposition film. (In the composite layer, steaming of inorganic oxides It is preferable that the film is formed on the PET or co-extruded stretched film side). Further, the gas barrier layers of A3, 6, 9, 11 and 14 are a single layer of a thin-film deposition film or a composite layer in which a gas barrier coating film is formed on the vapor-film deposition film (in the composite layer, the vapor-film deposition film is on the ONy or PET side. It is preferable that it is arranged in.

In the case of a container for a microwave oven, the ethylene-propylene block copolymer which is the sealant layer of (A1) to (A14) can be made of a polyethylene resin such as LDPE, LLDPE, MDPE, HDPE.
When the configuration of the automatic ventilation mechanism of the second embodiment described later is adopted in the container for a microwave oven, the above-mentioned thermosetting resin layer is formed in a part between the plastic film and the sealant layer. Just do it.

<Pouch>
FIG. 6 shows an example of a pouch which is an embodiment of the packaging container of the present invention. The pouch 10 of FIG. 6 is for a microwave oven, and is a standing type pouch formed by heat-sealing a body portion 11 and a bottom portion 12. As shown in FIG. 6, the body portion 11 includes a pair of main surface sheets 13 composed of a front main surface sheet 13a and a back main surface sheet 13b arranged so as to face each other, and a pair of superposed main surfaces. The vicinity of the side edge 14 of the sheet 13 is heat-sealed with each other. A bottom sheet 16 forming a bottom portion 12 is arranged between the lower edges 15 of the pair of main surface sheets 13.
Then, an accommodation space 17 for accommodating the contents is formed in the area surrounded by the pair of main surface sheets 13 and the bottom surface sheet 16. The bottom sheet 16 is bent convexly toward the accommodation space 17 side, and the vicinity of the peripheral edge thereof is heat-sealed together with the lower portion of the overlapping main surface sheets 13. By holding the shape of the lower ends of the pair of main surface sheets 13 by the bottom sheet 16, the pouch 10 is given independence and can be made into a standing type pouch.
In the pouch 10 of FIG. 6, an opening 19 is formed between the front main surface sheet 13a and the upper edge 18 of the back main surface sheet 13b, and the contents can be accommodated through the opening 19. After accommodating the contents, the packaging container can be sealed by heat-sealing the vicinity of the upper edge 18 where the opening 19 is formed. When the contents are taken out from the pouch 10, the vicinity of the upper edge 18 is torn from the notch 23 to open the package.

The front main surface sheet 13a, the back main surface sheet 13b, and the bottom surface sheet 16 of the pouch 10 can be formed of the packaging material 1. All of these sheets may be formed of a packaging material 1 having a glittering printing layer 3a containing metal scales, and only any sheet for which metallic luster is required is formed of the packaging material 1. May be good. In FIG. 6, it is shown that the front main surface sheet 13a is formed by the packaging material 1 having a laminated structure as shown in FIG. 2 so as to have the glitter printing layer 3a and the pattern printing layer 3b. ..
As the sheet other than the sheet in which the packaging material 1 is used, for example, a sheet in which the glittering printing layer 3a containing metal scales is not formed in the packaging material 1 or a sheet not containing the printing layer can be used. ..

<Automatic ventilation mechanism>
When the container is for a microwave oven, when the pressure inside the pouch rises due to the steam generated by cooking the contents such as food, the steam in the storage space is automatically released to the outside to prevent the pouch from bursting. It is preferable to have an automatic steaming mechanism. The automatic ventilation mechanism is preferably formed near the peripheral edge of the container.

The first embodiment of the automatic ventilation mechanism will be described with reference to FIG. The microwave oven pouch shown in FIG. 6 has a first unsealed region 21 that is not heat-sealed in the vicinity of the side edge 14 near the upper side of the container (pouch). The first unsealed region 21 reaches the side edge 14 and has an opening 22. Further, the first unsealed region 21 projects toward the accommodation space 17. Further, the heat-sealing portion 25 projects toward the accommodation space 17 so as to surround the first unsealed region 21 overhanging the accommodation space 17, forming the overhanging portion 25a. More specifically, the first unsealed region 21 and the accommodating space 17 are separated from each other, and an overhanging portion 25a is formed so as to be continuously provided with the heat sealing portion 25 for sealing the pouch. ..
In the pouch for a microwave oven shown in FIG. 6, the automatic ventilation mechanism 20 is formed by the above-mentioned opening 22, the first unsealed region 21, and the heat-sealed portion (overhanging portion 25a) protruding toward the accommodation space 17. Has been done. Specifically, when the pressure inside the container rises due to heating, the overhanging portion 25a of the heat sealing portion 25 receives a strong load, and the overhanging region 25 peels off first, so that the container is accommodated. The space 17 and the first unsealed region 21 communicate with each other, and steam can escape to the outside.
Further details of the automatic steaming mechanism of the type of FIG. 6 are described in JP-A-2015-120550, JP-A-2016-74457, and JP-A-2016-74458.

In the container 10 shown in FIG. 6, a second unsealed region 23 is formed on a side edge 14 opposite to the first unsealed region 21. The second unsealed region 23 is formed from the viewpoint of improving the yield of forming the opening 22 of the first unsealed region 21 when the plurality of retort containers 10 are continuously formed and then cut one by one. It is a thing and does not necessarily have to be formed.

A second embodiment A of the automatic ventilation mechanism will be described with reference to FIGS. 9 to 11.
The packaging container (pouch) 10 shown in FIG. 10 is an edge of the packaging material (a packaging material between the plastic film and the sealant layer having a heat-softening resin layer in a part near the edge) shown in FIG. It is a pouch made by heat-sealing the area around the part. Further, FIG. 11 is a cross-sectional view of the heat-sealed portion 25 around the edge portion of the packaging container 10 of FIG. 10 in XI-XI. Although omitted in FIGS. 9 and 11, an adhesive layer is formed between the thermosetting resin layer 7 and the brilliant printing layer 3a at the portion having the thermosetting resin layer 7. In places where the thermosetting resin layer 7 is not provided, it is assumed that an adhesive layer is formed between the sealant layer 4 and the brilliant printing layer 3a.
As shown in FIG. 10, the thermosetting resin layer 7 is formed from the inner edge to the outer edge of the heat-sealing portion 25 for sealing the pouch in at least a part region of the heat-sealing portion 25 of the packaging container 10. It needs to be done. The strength of the thermosetting resin layer 7 provided at such a position decreases as the thermosetting resin layer 7 is heated in a microwave oven to a high temperature.
As shown in FIG. 11, when the thermosetting resin layer 7 is heated in a microwave oven or the like and the internal pressure rises due to the expansion of the air in the packaging container 10 or the water vapor contained in the contents, the vicinity of the inner edge of the heat seal portion 25 A part of the sealant layer 4 is destroyed, and a part of the thermosetting resin layer 7 is interfacially peeled or coagulated and destroyed starting from an arbitrary portion "A" of the sealant layer 4 (the broken line of the symbol B is the sealant). A virtual line in which the layer 4 breaks and a virtual line in which the thermosetting resin layer 7 breaks at an interface or agglomerates are shown.) As a result, air and water vapor are released from the fractured portion, and the internal pressure of the packaging container 10 can be reduced.
The automatic ventilation mechanism of the second embodiment A can also be applied to a container with a lid, which will be described later.

As the packaging material constituting the container provided with the second embodiment A of the automatic ventilation mechanism, it is preferable to select a resin that easily disintegrates as the resin constituting the sealant layer. Specifically, polyethylene films such as LDPE and LLDPE (copolymer of butene-1 and ethylene) are preferable. Further, the packaging material constituting the container provided with the second embodiment A of the automatic ventilation mechanism preferably has a laminated structure according to any one of the following (B1) to (B4). In addition, "/" means the boundary of each layer. Further, in (B1) to (B4), PET is preferably a stretched film. In addition, ONy means stretched nylon.

(B1) PET / printing layer having a glittering printing layer / thermosetting resin layer / adhesive layer / sealant layer (polyethylene film)
(B2) PET / gas barrier layer / printing layer having a glittering printing layer / thermosetting resin layer / adhesive layer / sealant layer (polyethylene film)
(B3) ONy / Printing layer having a glittering printing layer / Thermosetting resin layer / Adhesive layer / Sealant layer (polyethylene film)
(B4) ONy / Gas barrier layer / Printing layer having a glittering printing layer / Thermosetting resin layer / Adhesive layer / Sealant layer (polyethylene film)
The gas barrier layers of B2 and B4 are a single layer of an inorganic oxide vapor deposition film or a composite layer in which a gas barrier coating film is formed on the inorganic oxide vapor deposition film (in the composite layer, the inorganic oxide vapor deposition film is formed. It is preferably arranged on the PET or ONy side).

Further, as a second embodiment B of the automatic ventilation mechanism, there is a means of using a packaging material having a heat generating printing layer in a part of a region between the plastic film and the sealant layer.
In the second embodiment B of the automatic ventilation mechanism, the temperature of the region having the heat-generating print layer (heat-generating region) rises faster than the region without the heat-generating printing layer (non-heating region), so that the heat-sealed portion Of these, the sealed state of the part corresponding to the heat generation area is eliminated, and automatic ventilation can be performed.
The automatic ventilation mechanism of the second embodiment B can be applied to a pouch and a container with a lid described later.

As the packaging material constituting the container provided with the second embodiment B of the automatic ventilation mechanism, it is preferable that the resin constituting the sealant layer contains propylene as a main component. Specifically, a film made of a mixed resin of propylene and polyethylene is preferable. Further, the packaging material constituting the container provided with the second embodiment B of the automatic ventilation mechanism preferably has a laminated structure according to any one of the following (B1') to (B4'). In addition, "/" means the boundary of each layer. Further, in (B1') to (B4'), PET is preferably a stretched film. In addition, ONy means stretched nylon.

(B1') PET / Bright printing layer / Heat generation printing layer / Sealant layer (film made of mixed resin of propylene and polyethylene)
(B2') PET / gas barrier layer / brilliant printing layer / heat-generating printing layer / sealant layer (film made of a mixed resin of propylene and polyethylene)
(B3') ONy / Bright printing layer / Heat generation printing layer / Sealant layer (film made of mixed resin of propylene and polyethylene)
(B4') ONy / Gas barrier layer / Glitter printing layer / Heat generation printing layer / Sealant layer (Film made of mixed resin of propylene and polyethylene)
The gas barrier layers of B2'and B4' are a single layer of an inorganic oxide vapor deposition film or a composite layer in which a gas barrier coating film is formed on the inorganic oxide vapor deposition film (in the composite layer, inorganic oxide vapor deposition is performed. The film is preferably placed on the PET or ONy side).

<Container with lid>
7 and 8 show an example of an embodiment of the container with a lid of the present invention. FIG. 7 is a top view, and FIG. 8 is a sectional view taken along line IV-IV of FIG. The container with a lid 30 shown in FIGS. 7 and 8 includes a container body 32 in which the storage portion 31 is formed, and a lid 33 joined to the container body 32 so as to seal the storage portion 31 of the container body 32. ing. In FIG. 7, the shape of the container body 32 is substantially rectangular, but is not particularly limited. The molding method of the container body 32 is not particularly limited, and may be, for example, a tray formed by injection molding or a container formed by deep drawing molding.
Further, since the material of the container body 32 is to be joined to the lid 33, it is usually a thermoplastic resin such as PP or PET, and in particular, when it is a container with a lid for a microwave oven, PP is preferably used from the viewpoint of heat resistance and the like.
A container body is also suitable in which most of the accommodating portion and the flange are made of paper and a thermoplastic resin layer is formed on the surface of the flange portion. The thermoplastic resin layer formed on the surface of the flange portion is preferably PP and PE alone or in combination.

It is preferable that the lid 33 of the container with a lid 30 is formed of the packaging material 1 of the present invention. In addition, in FIG. 7, it is shown that the lid 33 is formed by the packaging material 1 having a laminated structure as shown in FIG. 2 so as to have the glitter printing layer 3a and the pattern printing layer 3b. ..

The lid 33 has an easy peel property as described in the above description of the sealant layer 4 of the packaging material 1 from the viewpoint of peeling from the container body 32 to facilitate opening the container 30 with a lid. Is preferable.
Specifically, the lid 33 and the container body 32 are joined at the joining line 35 of the flange portion 34 of the container body 32. The joining line 35 may be formed by, for example, heat-sealing the lid 33 and the flange portion 34, or may be formed by a separate component such as an adhesive layer.

When the container 30 with a lid is used for a microwave oven, the container with a lid is attached when the pressure inside the container 30 with a lid rises due to steam generated by cooking food or the like contained in the container body 32. It is preferable to have an automatic steaming mechanism (third embodiment of the automatic steaming mechanism) that automatically releases the steam in the container 30 to the outside and prevents the container 30 with a lid from bursting.
For example, the flange portion 34 has a protruding portion 34a protruding toward the center of the container body 32, and the joining line 35 is also formed to protrude toward the center of the container along the protruding portion 34a. It has a line 35a. Since the joining line 35 is formed in such a form, it becomes easy to peel off from the protruding line 35a of the above joining lines 35 as the pressure inside the container 30 with a lid increases due to heating, and the container main body. The accommodating portion 31 of 32 can be communicated with the outside, and the steam in the container with a lid 30 can be released to the outside.
In the container with a lid 30 shown in FIGS. 7 and 8, the protruding portions 34a are formed on the opposite long sides of the flange portions 34, respectively, but the two protruding portions 34a are not necessarily formed. You may.
In the case of the third embodiment of the automatic ventilation mechanism, the sealant layer of the lid is preferably a film made of a mixed resin of polypropylene and polyethylene.

Further, as the lid 33 constituting the container 30 with a lid, the packaging material shown in FIG. 9 (a packaging material between the plastic film and the sealant layer and having a heat-softening resin layer in a part near the edge). By using the above, steam can be released when heated in a microwave oven for the same reason as described in the second embodiment A of the automatic steaming mechanism described above.
Further, by using a packaging material between the plastic film and the sealant layer and having a heat-generating printing layer in a part near the edge as the lid body constituting the container with a lid, the above-mentioned automatic steaming mechanism can be obtained. For the same reasons as described in the second embodiment B, steam can escape when heated in a microwave oven.

Examples of the material of the container body constituting the container with a lid are shown in X1 to X5. In the case of frozen foods, X2 or X4 is preferred.
X1: PP + PE (PE is a small amount (PE is 5 to 40% by mass, PP is the rest))
X2: PE
X3: Paper (PP on the surface of the flange)
X4: Paper (PE on the surface of the flange)
X5: PP

Further, examples of the material of the innermost layer of the lid body constituting the container with a lid are shown in Y1 to Y3. It is preferable that Y2 has a PP layer on the outer layer side of PP + PE. Further, Y3 preferably has a PE layer on the outer layer side of PP + PE.
Y1: PE (LDPE or LLDPE (copolymer of butene-1 and ethylene))
Y2: PP + PE (PP is the main component (PE is 5 to 40% by mass, PP is the rest))
Y3: PP + PE (PE is the main component (PP is 5 to 40% by mass, PE is the rest))

A container with a lid in which the above X1 to X4 and the above Y1 to Y2 are combined is preferable from the viewpoint of easy peelability. When combining X2 and X4 with Y1, the PEs are of different types. Types of PE include low density PE (LDPE), linear low density PE (LLDPE), medium density PE (MDPE), high density PE (HDPE).

<Lid body>
The lid of the present invention is formed of the above-mentioned packaging material of the present invention.

The packaging material constituting the lid preferably has a laminated structure according to any one of (1) to (4) described above.
When the lid is used for a microwave oven or a retort container, the plastic film may be a single polyester film, a single polyamide film such as nylon, or a composite film containing one or more polyester films and polyamide films. preferable.
When the lid is used for a microwave oven or as a retort container, the intermediate base material layer includes a single polyester film, a single polyamide film such as nylon, a composite film containing one or more polyester films and polyamide films, and a composite film. , It is preferable to use paper.
When the lid is used for a microwave oven or a retort container, it is preferable to use a film made of a resin having both heat resistance and easy peeling property as the sealant layer. Such a film differs depending on the type of container, but when the container is a propylene-based resin which is a general-purpose resin, it is preferable to use a film made of a resin in which PP is mixed with one or more selected from PE, polybutene and polystyrene. .. The sealant layer may have a multi-layer structure, and easy peeling property may be imparted only to the side of the sealant layer to be joined to the container body (the innermost layer in the packaging material).

More specifically, the packaging material constituting the lid for the microwave oven preferably has a laminated structure according to any one of the following (C1) to (C10). In addition, "/" means the boundary of each layer. Further, in (C1) to (C10), PET is preferably a stretched film. In addition, ONy means stretched nylon.
(C1) PET / Print layer with glitter print layer / Adhesive layer / ONy / Adhesive layer / Sealant layer with easy peelability (C2) PET / Gas barrier layer / Print layer with glitter print layer / Adhesive Agent layer / ONy / Adhesive layer / Sealant layer with easy peeling property (C3) PET / Printing layer with glittering printing layer / Adhesive layer / Gas barrier layer / ONy / Adhesive layer / Easy peeling property Sealant layer (C4) PET / Print layer with glitter print layer / Adhesive layer / PET / Adhesive layer / Sealant layer with easy peelability (C5) PET / Gas barrier layer / Print layer with glitter print layer / Adhesive layer / PET / Adhesive layer / Sealant layer with easy peeling property (C6) PET / Printing layer with glittering printing layer / Adhesive layer / Gas barrier layer / PET / Adhesive layer / Easy peeling property The sealant layer (C7) ONy / the printing layer having the glittering printing layer / the adhesive layer / ONy / the adhesive layer / the sealing layer having the easy peeling property (C8) ONy / the gas barrier layer / the glittering printing layer Print layer / Adhesive layer / ONy / Adhesive layer / Sealant layer with easy peel (C9) ONy / Print layer with glitter print layer / Adhesive layer / Gas barrier layer / ONy / Adhesive layer / Easy peel Sealant layer with properties (C10) ONy / Print layer with glitter print layer / Adhesive layer / EVOH / Adhesive layer / Sealant layer with easy peel properties C2, 5 and 8 gas barrier layers are inorganically oxidized. It is a single layer of a vapor-deposited film of an object or a composite layer in which a gas barrier coating film is formed on a vapor-deposited film of an inorganic oxide (in the composite layer, the vapor-deposited film of an inorganic oxide is arranged on the PET or ONy side). Is preferable. The gas barrier layers of C3, 6 and 9 are a single layer of a thin-film deposition film or a composite layer in which a gas barrier coating film is formed on the vapor-film deposition film (in the composite layer, the vapor-film deposition film is arranged on the ONy or PET side). It is preferable to have.

When the configuration of the second embodiment A or B of the above-mentioned automatic ventilation mechanism is adopted for the lid, the above-mentioned thermosetting resin layer or heat-generating printing is partially formed between the plastic film and the sealant layer. A layer may be formed.

Hereinafter, the present invention will be described in detail with reference to Examples, but the present invention is not limited thereto.

1. 1. Preparation of packaging material [Example 1]
A corona discharge treatment was applied to one surface of a plastic film having a thickness of 12 μm (PET film, Ra on both surfaces of 0.05 μm or less), and then a thin-film film of silicon oxide having a thickness of 10 nm was formed. Further, after plasma treatment with a mixed gas of oxygen and argon, a coating liquid containing ethyl silicate and polyvinyl alcohol as main components is applied with a gravure roll coater to form a gas barrier coating film having a dry film thickness of 300 nm. did.
Next, the following ink 1 for a glitter printing layer was gravure-printed on the entire surface of the gas barrier layer and dried to form a glitter printing layer having a dry film thickness of 1.5 μm.
Next, a white pigment ink was gravure-printed on the entire surface of the glitter printing layer and dried to form a white solid printing layer having a dry film thickness of 1.5 μm.
Next, a coating liquid for forming an adhesive layer containing a polyol and an isocyanate compound was applied onto an intermediate base material layer (stretched Ny, thickness 15 μm) and dried to form a polyurethane-based adhesive layer having a thickness of 3 μm. Next, an intermediate base material on which an adhesive layer was formed was dry-laminated on the surface of the white solid printing layer.
Next, a coating liquid for forming an adhesive layer containing a polyol and an isocyanate compound is applied onto a sealant layer (CPP, a single-layer film of ethylene-propylene block copolymer, thickness 70 μm), dried, and a polyurethane-based film having a thickness of 3 μm is applied. An adhesive layer was formed. Next, the sealant layer on which the adhesive layer was formed was dry-laminated on the surface of the intermediate base material to obtain the packaging material of Example 1.
From the outer layer side, the packaging material of Example 1 includes a plastic film, a vapor-deposited film, a gas barrier coating film, a printing layer (bright printing layer, a white solid printing layer), an adhesive layer, an intermediate base material layer, an adhesive layer, and the like. It has a sealant layer.

<Ink for brilliant printing layer 1>
-Composition containing metal scales and mineral spirit: 9 parts by mass (metal scale content is 85% by mass)
(Metal scales: non-leaving type aluminum scales, aspect ratio 41, average thickness 0.08 μm)
-Organic yellow pigment: 3 parts by mass (average particle size: 150 nm)
-Inorganic fine particles: 2 parts by mass (silica, average particle diameter: 20 nm)
-Binder resin: 20 parts by mass (polyurethane resin, melting point 140 ° C)
-Solvent 1: 70 parts by mass (mixed solvent of propylene glycol monomethyl ether, normal propyl acetate, ethyl acetate, isopropanol)
・ Solvent 2: 6 parts by mass (mineral spirit)

[Example 2]
The packaging material of Example 2 was obtained in the same manner as in Example 1 except that the ink 1 for the glitter printing layer was changed to the ink 2 for the glitter printing layer described below.

<Ink for brilliant print layer 2>
-White pearl pigment (average length 15 μm, average thickness 0.2 μm): 10 parts by mass ・ Colored pearl pigment (colored pearl pigment in which the coating layer of the mica is ferric oxide, average length 15 μm, average thickness 0.2 μm ): 20 parts by mass ・ Carbon black: 0.001 parts by mass ・ Anti-settling agent (fine particle silica): 0.1 parts by mass ・ Binder resin (polyurethane resin): 10 parts by mass ・ Solvent (propylene glycol monomethyl ether, normal acetate) Mixed solvent of propyl, ethyl acetate, isopropanol): 60 parts by mass

[Example 3]
The packaging material of Example 3 was obtained in the same manner as in Example 1 except that the amount of the composition containing the metal scales and mineral spirit of the glitter printing layer ink 1 was changed from 9 parts by mass to 16 parts by mass. It was.

[Example 4]
A corona discharge treatment was applied to one surface of a plastic film having a thickness of 12 μm (PET film, Ra on both surfaces of 0.05 μm or less), and then a thin-film film of silicon oxide having a thickness of 10 nm was formed. Further, after plasma treatment with a mixed gas of oxygen and argon, a coating liquid containing ethyl silicate and polyvinyl alcohol as main components is applied with a gravure roll coater to form a gas barrier coating film having a dry film thickness of 300 nm. did.
Next, the following pattern layer ink 1 was applied to the entire surface of the gas barrier layer and dried to form a pattern printing layer having a dry film thickness of 0.3 μm and having light transmission.
Next, the glitter printing ink 2 (an ink having the same formulation as the ink 1 except that the organic yellow pigment is removed from the above glitter print layer ink 1) is applied to the entire surface of the pattern printing layer having light transmission. Was gravure-printed and dried to form a brilliant printed layer having a dry film thickness of 1.5 μm.
Next, a white pigment ink was gravure-printed on the entire surface of the glitter printing layer and dried to form a white solid printing layer having a dry film thickness of 1.5 μm.
Next, a coating liquid for forming an adhesive layer containing a polyol and an isocyanate compound was applied onto an intermediate base material layer (stretched Ny, thickness 15 μm) and dried to form a polyurethane-based adhesive layer having a thickness of 3 μm. Next, an intermediate base material on which an adhesive layer was formed was dry-laminated on the surface of the white solid printing layer.
Next, a coating liquid for forming an adhesive layer containing a polyol and an isocyanate compound is applied onto a sealant layer (CPP, a single-layer film of ethylene-propylene block copolymer, thickness 70 μm), dried, and a polyurethane-based film having a thickness of 3 μm is applied. An adhesive layer was formed. Next, a sealant layer having an adhesive layer formed on the surface of the intermediate base material was dry-laminated to obtain a packaging material of Example 4.
From the outer layer side, the packaging material of Example 4 includes a plastic film, a vapor deposition film, a gas barrier coating film, a printing layer (a light-transmitting pattern printing layer, a brilliant printing layer, a white solid printing layer), an adhesive layer, and the like. It has an intermediate base material layer, an adhesive layer and a sealant layer.

<Ink 1 for pattern layer>
-Organic yellow pigment: 2 parts by mass (average particle size: 150 nm)
-Binder resin: 20 parts by mass (polyurethane resin, melting point 140 ° C)
-Solvent 1 (mixed solvent of propylene glycol monomethyl ether, normal propyl acetate, ethyl acetate, isopropanol): 70 parts by mass

[Comparative Example 1]
A coating liquid for forming an adhesive layer containing a polyol and an isocyanate compound is applied onto a white solid printing layer and dried to form a polyurethane-based adhesive layer having a thickness of 3 μm, and then an intermediate base material layer (an intermediate base material layer () is formed on the adhesive. A packaging material of Comparative Example 1 was obtained in the same manner as in Example 1 except that the stretched Ny (thickness 15 μm) was laminated.
The solvent ratio of the coating liquid for forming the adhesive layer is 60% by mass, and the solvent in the coating liquid is ethyl acetate.

[Comparative Example 2]
A coating liquid for forming an adhesive layer containing a polyol and an isocyanate compound is applied onto a white solid printing layer and dried to form a polyurethane-based adhesive layer having a thickness of 3 μm, and then an intermediate base material layer (an intermediate base material layer () is formed on the adhesive. A packaging material of Comparative Example 2 was obtained in the same manner as in Example 2 except that the stretched Ny (thickness 15 μm) was laminated.
The solvent ratio of the coating liquid for forming the adhesive layer is 60% by mass, and the solvent in the coating liquid is ethyl acetate.

2. 2. Measurement and Evaluation The following measurements and evaluations were performed on the packaging materials of Examples and Comparative Examples. The results are shown in Table 1.

2-1. L ^* SCE
A black plate is attached to the CPP-side surface of the packaging materials of Examples 1 to 4 and Comparative Examples 1 and 2 via a transparent adhesive layer, and the packaging materials of Examples 1 to 4 and Comparative Examples 1 and 2 are transparent. A sample in which the pressure-sensitive adhesive layer and the black plate were laminated in this order was prepared. As the sample, a CPP, a transparent adhesive, and a black plate having a refractive index difference of 0.05 or less were used. The difference in refractive index between the CPP and the transparent pressure-sensitive adhesive layer and the difference in refractive index between the transparent pressure-sensitive adhesive layer and the black plate were all within 0.05.
Next, L ^* SCE was measured from the plastic film side of the sample using a spectrocolorimeter (manufactured by Konica Minolta, trade name “CM-700d”). 20 points were measured for each sample, and the average value was taken as L ^* SCE of the packaging materials of Examples 1 to 4 and Comparative Examples 1 and 2. The light source was D65 and the viewing angle was 10 degrees.

Coefficient of variation of 2-2.60 degree mirror glossiness The 60 degree mirror glossiness was measured from the plastic film side of the sample prepared in 2-1 according to JIS Z8741: 1997. Using a gloss meter (Tetsutani Co., Ltd., trade name: micro-gloss 60 ° xs), each sample was measured at 20 points, and the variation in 60-degree mirror gloss (σ) and the average value of 60-degree mirror gloss were measured. Was calculated, and the value obtained by dividing the variation (σ) by the average value was used as the coefficient of variation of the 60-degree mirror glossiness of the packaging materials of Examples 1 to 4 and Comparative Examples 1 and 2.

2-3. Aesthetic appearance due to metallic luster Under the illumination of a three-wavelength fluorescent lamp, the packaging materials of Examples and Comparative Examples were observed from a direction slightly deviated from the specular reflection direction of the fluorescent lamp, and the aesthetic appearance due to metallic luster was evaluated.
You can feel a high level of metallic luster, and you can feel a metallic luster with 3 points that are extremely aesthetically pleasing based on the metallic luster and 2 points that cannot be said to be either. What is a high level metallic luster? Twenty subjects evaluated the score with one point that could not be said, and calculated the average score.
<Evaluation criteria>
A: Average score is 2.5 or more B: Average score is more than 2.0 and less than 2.5 C: Average score is 2.0 or less

From the results in Table 1, it can be confirmed that the packaging materials of Examples 1 to 4 can impart a high level of metallic luster without using a metal layer, and are extremely excellent in design. Since the packaging material of Example 4 has a small coefficient of variation in mirror gloss, it is particularly excellent in aesthetic appearance due to metallic luster. Further, since the packaging material of Example 4 does not contain a colorant in the glitter printing layer and contains a colorant in the light-transmitting pattern printing layer located on the outer layer side of the glitter printing layer, there is an example. The in-plane color was more uniform than that of the packaging materials 1 to 3. In addition, although not evaluated in the table, when the packaging materials of Examples 1 to 4 were heated in a microwave oven (600 W for 2 minutes), no sparks were generated and no holes were generated due to local overheating. It was.

1 Packaging material 2 Plastic film 3a Glitter printing layer 3b Pattern printing layer 3d White solid printing layer 4 Sealant layer 5 Intermediate base material layer 6a Adhesive layer 6b Adhesive layer 7 Heat-softening resin layer 10 Packaging container 11 Body 12 Bottom 13 Main surface sheet 14 Side edge 15 Lower edge 16 Bottom sheet 17 Storage space 18 Upper edge 19 Opening 20 Automatic ventilation mechanism 21 1st unsealed area 22 Opening 23 2nd unsealed area 24 Notch 25 Heat-sealed part 25a Overhanging part 30 Container with lid 31 Storage part 32 Container body 33 Lid body 34 Flange part 35 Joining line

Claims (8)

At least, the plastic film, the printing layer, the adhesive layer, and the sealant layer are laminated from the outer layer side in this order, and the printing layer and the adhesive layer are adjacent to each other as the printing layer. A packaging material having a glittering printing layer containing a glittering pigment and a binder resin and satisfying the following conditions 1 and 2.
<Condition 1>
When the diffused light reflection SCE is measured from the outer layer side of the packaging material and the L ^* value of the L ^* a ^* b ^* color system calculated from the spectral spectrum of the diffused light reflection SCE is L ^* SCE, L ^* SCE Is over 40.
<Condition 2>
The 60-degree mirror glossiness was measured from the outer layer side of the packaging material in accordance with JIS Z8741: 1997, and the coefficient of variation of the 60-degree mirror glossiness calculated from the measured values was less than 0.100. The packaging material according to claim 1, wherein the coefficient of variation is 0.030 or more and less than 0.100. The packaging material according to claim 1 or 2, which comprises at least one selected from metal scales and pearl pigments as the brilliant pigment. A packaging container in which at least a part is formed of the packaging material according to any one of claims 1 to 3. The packaging container according to claim 4, wherein the packaging container is a pouch. A container with a lid having a container body having an accommodating portion and a lid body joined to the container body so as to seal the accommodating portion, wherein the lid body is formed of the packaging material. Item 4. The packaging container according to item 4. The packaging container according to any one of claims 4 to 6, which is a retort container. A lid made of the packaging material according to any one of claims 1 to 3.