JP7379917B2 - Packaging materials, packaging containers and lids - Google Patents

Description

The present invention relates to a packaging material, a packaging container, and a lid.

Packaging materials are sometimes decorated with high-brightness metallic luster in order to create a sense of luxury and luxury for the packaged item and create an aesthetic appearance. As such a decoration means, for example, forming a metal layer such as a metal vapor deposition film or metal foil is generally performed.

However, packaging materials using metal layers have a problem of increased cost. In addition, among the metal layers, metal vapor-deposited films cannot be manufactured in-line with other layers that make up the packaging material, resulting in poor manufacturing efficiency, and among the metal layers, metal foils are difficult to handle. There is a problem.
Furthermore, when packaging materials using a metal layer are heated in a microwave oven, the microwaves in the microwave may reflect off the surface of the metal layer, creating sparks, which may cause damage to the microwave or an accident. However, there is also the problem that the contents inside the packaging container cannot be sufficiently heated.

For this reason, for example, Patent Document 1 proposes a packaging material in which a glossy layer is formed with an ink containing a high-brightness aluminum paste at a predetermined concentration instead of a metal layer.

JP 2017-81589 Publication

However, although the packaging material in which a glossy layer is formed with aluminum paste as in Patent Document 1 has a certain degree of metallic luster, depending on the environment in which the packaging material is observed (particularly in an indoor environment with multiple lights), the metallic luster may change. There were many cases where I felt like something was missing.

The present invention was made to solve the above technical problem, and provides a packaging material that has an excellent design due to metallic luster without using a metal layer, and a packaging container and lid using the packaging material. The purpose is to provide the body.

That is, the present invention provides the following [1] to [3].
[1] At least a plastic film, a glitter print layer, and a sealant layer are laminated in this order from the outer layer side, the glitter print layer contains a glitter pigment and a binder resin, and the following condition 1 is provided. Packaging material that satisfies (2) and (2).
<Condition 1>
Diffuse light reflection SCE is measured from the outer layer side of the packaging material, and when the L ^* value of the L ^* a ^* b ^* color system calculated from the spectrum of the diffuse light reflection SCE is defined as L ^* SCE, L ^* SCE is 40 or more.
<Condition 2>
G60/L ^* SCE is less than 1.00, where G60 is the 60 degree specular gloss measured from the outer layer side of the packaging material according to JIS Z8741:1997.
[2] A packaging container at least partially formed of the packaging material described in [1] above.
[3] A lid formed of the packaging material according to [1] above.

According to the present invention, it is possible to provide a packaging material, a packaging container, and a lid that have an excellent design due to metallic luster without using a metal layer.

FIG. 1 is a schematic cross-sectional view showing an example of the laminated structure of the packaging material of the present invention. FIG. 1 is a schematic cross-sectional view showing an example of the laminated structure of the packaging material of the present invention. FIG. 1 is a schematic cross-sectional view showing an example of the laminated structure of the packaging material of the present invention. FIG. 3 is an image diagram of a cross section of a glitter print layer 3a of a packaging material of an example. FIG. 3 is an image diagram of a cross section of a glitter print layer 3a of a packaging material of a comparative example. It is a sectional view showing an example of the pouch for microwave ovens among the packaging containers of the present invention. It is a top view showing an example of a container with a lid among packaging containers of the present invention. 8 is a sectional view taken along the line IV-IV in FIG. 7. FIG. FIG. 3 is a schematic cross-sectional view showing another example of the laminated structure of the packaging material of the present invention. It is a schematic plan view which shows another example of the pouch for microwave ovens of the packaging containers of this invention. 11 is a sectional view taken along line XI-XI in FIG. 10. FIG.

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

[Packaging material]
The packaging material of the present invention has a structure in which at least a plastic film, a glitter print layer, and a sealant layer are laminated in this order from the outer layer side, and the glitter print layer contains a glitter pigment and a binder resin. , which satisfies conditions 1 and 2 below.
<Condition 1>
Diffuse light reflection SCE is measured from the outer layer side of the packaging material, and when the L ^* value of the L ^* a ^* b ^* color system calculated from the spectrum of the diffuse light reflection SCE is defined as L ^* SCE, L ^* SCE is 40 or more.
<Condition 2>
G60/L ^* SCE is less than 1.00, where G60 is the 60 degree specular gloss measured from the outer layer side of the packaging material according to JIS Z8741:1997.

<Laminated structure>
1 to 3 schematically show the laminated structure in the thickness direction of the packaging material 1 of the present invention. In FIGS. 1 to 3, the upper side is the outer layer side, and the lower side is the inner layer side. The packaging material 1 only needs to have at least the plastic film 2, the glitter print layer 3a, and the sealant layer 4 laminated in this order from the outer layer side, and may also include other layers as constituent layers.
For example, as shown in FIGS. 1 to 3, an intermediate base material layer 5 may be provided between the glitter print layer 3a and the sealant layer 4, which is laminated on both sides with an adhesive layer 6 interposed therebetween. . Further, as shown in FIG. 2, a pattern printing layer 3b may be provided on the outer layer side of the glitter printing layer 3a, or as shown in FIG. 3, a pattern printing layer 3b may be provided in parallel with the glitter printing layer 3a. It may have. Further, as shown in FIG. 3, a solid printing layer 3d may be provided on the inner layer side of the glitter printing layer 3a.

Further, in the packaging material 1, a gas barrier layer (not shown) may be formed between the plastic film 2 and the glitter print layer 3a or between the glitter print layer 3a and the sealant layer 4.
Specifically, the packaging material of the present invention can be exemplified by the following laminated structures (1) to (4). Note that in (1) to (4) below, the layer on the left side is the outer layer side, and "/" means the boundary between each layer.
(1) Plastic film/Glitter printed layer/Intermediate base material layer/Sealant layer (2) Plastic film/Gas barrier layer/Glitter printed layer/Sealant layer (3) Plastic film/Gas barrier layer/Glitter printed layer/Intermediate base Material layer/Sealant layer (4) Plastic film/Glitter printed layer/Gas barrier layer/Intermediate base material layer/Sealant layer In addition, from the viewpoint of making the Glitter print layer 3a visible from the outside, from the Glitter print layer 3a. The layer formed on the outer layer side shall have light transmittance at least in part within the plane of the layer. In addition, the gas barrier layers (2) and (3) are a single layer of a vapor-deposited film of an inorganic oxide, 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, an inorganic It is preferable that the vapor-deposited oxide film is placed on the plastic film side. Further, the gas barrier layer (4) is a single layer of a vapor deposited film, or a composite layer in which a gas barrier coating film is formed on a vapor deposited film (in the composite layer, the vapor deposited film is disposed on the intermediate base layer side). It is preferable.

The packaging material of the present invention is required to satisfy Condition 1 below.
<Condition 1>
Diffuse light reflection SCE is measured from the outer layer side of the packaging material, and when the L ^* value of the L ^* a ^* b ^* color system calculated from the spectrum of the diffuse light reflection SCE is defined as L ^* SCE, L ^* SCE is 40 or more.

Diffuse light reflection SCE is reflected light other than the reflected light passing through the light trap, which is measured by applying light to the sample surface from all directions using an integrating sphere and opening the light trap corresponding to the specular reflection direction.
When people visually recognize objects, they often view them at angles where there is no specularly reflected light. Therefore, the diffuse light reflection SCE excluding specular reflection light is useful as a parameter for evaluating the appearance of an object. Further, the L ^* value of the L ^* a ^* b ^* color system is an index of lightness. 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.
Note that the L ^* a ^* b ^* color system was standardized by the Commission Internationale de l'Eclairage (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 perceived. L ^* SCE is preferably 45 or more, more preferably 50 or more, and even more preferably 55 or more.
If 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, more preferably 75 or less.

A typical SCE measurement device has a configuration that complies with geometric condition c of JIS Z8722:2009. More specifically, a typical SCE measurement device uses D65 as the light source of an integrating sphere spectrophotometer, the position of the receiver is +8 degrees with respect to the normal to the sample, and the aperture angle of the receiver is 10 degrees, the light trap position is −8 degrees to the sample normal, and the viewing angle is 2 degrees or 10 degrees. In this specification, the viewing angle is 10 degrees.
An example of a measuring device that satisfies the above conditions is a handy spectrophotometer manufactured by Konica Minolta (trade name "CM-700d").

In this specification, L ^* SCE is the average value of measurement values at 20 locations.
In addition, when the packaging material has light transmittance, L ^* SCE and specular gloss are determined by preparing a sample in which a black plate is attached to the surface of the packaging material on the sealant layer side via a transparent adhesive layer, and It is preferable to measure from the plastic film side. The refractive index of the transparent adhesive layer of the sample can be such that the refractive index difference between the refractive index of the layer on the sealant layer side of the packaging material and the refractive index of the black plate is within 0.05, and preferably the refractive index difference is 0. It is .00. In this specification, the refractive index means the refractive index at a wavelength of 589 nm.
Further, it is preferable that the 20 locations where L ^* SCE and specular gloss are measured are locations where the laminated structure of the packaging material, etc. is the same. For example, in the case of the packaging material in FIG. 1, the laminated structure is the same at all locations, but in the packaging material in FIG. 2, there are locations that do not have the pattern printing layer 3b and locations that have the pattern printing layer 3b . In such a case, it is preferable to first perform measurements at 20 locations only, which do not have the pattern-printed layer 3b. In addition, in the packaging material shown in FIG. 2, measurements may be performed at 20 locations only at locations where the pattern printing layer 3b is present, but in that case, the measurement is performed at locations where the pattern printing layer 3b has approximately the same color and approximately the same density. It is preferable. In addition, when a part of the packaging material is textured such as embossing, it is preferable to measure at 20 locations where the texture is applied or at 20 locations where the texture is not processed. In addition, it is preferable to measure the 20 measurement points so that the measurement spots do not overlap, but if the area of the area where the lamination structure etc. is the same is small, the measurement should be performed so that some of the measurement spots overlap. It's okay.
Further, it is preferable that the laminated structure of the L ^* SCE measurement point and the laminated structure of the specular gloss measurement point be the same.
As a result of the measurement as described above, if the packaging material satisfies Conditions 1 and 2 in at least one of the locations where the laminated structure, etc. of the packaging material is the same, the packaging material falls within the scope of the present invention. For example, in the packaging material shown in FIG. 2, either "measurement results at 20 locations where the pattern printing layer 3b does not exist" or "measurement results at 20 locations where the pattern printing layer 3b has approximately the same color and approximately the same density" If conditions 1 and 2 are satisfied, the invention falls within the scope of the present invention.

The packaging material of the present invention is further required to satisfy Condition 2 below.
<Condition 2>
G60/L ^* SCE is less than 1.00, where G60 is the 60 degree specular gloss measured from the outer layer side of the packaging material according to JIS Z8741:1997.

G60, which is part of the parameters of condition 2, is widely used as an index for evaluating glossiness. However, as described above, when people visually recognize an object, they often view it at an angle where there is no specularly reflected light, so the appearance of the object and the value of G60 may not correlate with each other. Therefore, in the present invention, the basic index of metallic luster is L ^* SCE. The large L ^* SCE is considered to be because the glitter pigment in the glitter print layer is tilted at a predetermined ratio.
However, since SCE is all light excluding specular reflection components, the intensity of diffusion of light excluding specular reflection components cannot be compared. For example, as shown in Figure 4, the ratio of glitter pigments in the glitter print layer is tilted is high, and as shown in Figure 5, the ratio of glitter pigments in the glitter print layer to be tilted is high. In some cases, the L ^* SCE value may ^be about the same as when the brightness pigment is at a moderate level. .
On the other hand, since G60 is an index of the strength of regular reflection, it is considered that the magnitude of G60 can be an index of the proportion of glitter pigments arranged in parallel in the glitter print layer. Furthermore, as mentioned above, if the ratio of the glitter pigments being tilted exceeds a predetermined ratio, the L ^* SCE values tend to be about the same, but G60 becomes smaller as the ratio of the glitter pigments being tilted increases. . However, since the absolute value of G60 is affected by the material of the glitter pigment, the absolute value of G60 cannot be said to be an indicator of the proportion of glitter pigments arranged in parallel in the glitter print layer.
Therefore, in the present invention, "G60/L ^* SCE", which is the ratio of G60 to L ^* SCE, is used as an index of the proportion of glitter pigments arranged in parallel in the glitter print layer.

FIG. 4 is an image diagram of the cross section of the glitter print layer 3a of the packaging material that satisfies condition 2 (cross section of the glitter print layer 3a of the example), and FIG. 5 shows the glitter print of the packaging material that does not satisfy condition 2. It is an image diagram of a cross section of layer 3a (cross section of glittering printed layer 3a of a comparative example).
As shown in FIG. 4, in the cross section of the glitter print layer 3a that satisfies condition 2, there is a large proportion of the glitter pigment y tilted, while as shown in FIG. In the cross section 3a, the proportion of the glittering pigment y being tilted is small.
Comparing the angular distribution of reflected light when external light is incident on the glitter print layer 3a in FIGS. 4 and 5, it is found that in the glitter print layer 3a in FIG. In contrast to the fact that the reflected light is concentrated in a narrow range near the direction of reflection, the angular range of the reflected light is widened in the glitter print layer 3a of FIG. Note that the solid line arrows in FIGS. 4 and 5 indicate incident light, the dotted line arrows indicate regularly reflected light of the incident light, and the dashed-dotted line arrows indicate the angular range of the reflected light.
In other words, a glittering printed layer that does not satisfy Condition 2 will have a strong metallic luster when observed in a very narrow area near the specular reflection direction, but a metallic luster will be felt when observed away from the specular reflection direction. I can't. On the other hand, in the case of a glitter print layer that satisfies Condition 2, the brightness based on the reflection of the glitter print layer can be detected even when observed away from the vicinity of the specular reflection direction.
Furthermore, most environments in which people observe packaging materials are indoors, and indoor environments often have multiple light sources. In other words, a person observes the packaging material based on the reflected light from a plurality of light sources. However, even if there are multiple light sources and multiple specular reflection directions, the angular range near each specular reflection direction is narrow. Therefore, even if a plurality of light sources are present, a glitter print layer that does not satisfy condition 2 has a narrow angle range in which metallic luster can be perceived.
On the other hand, with a glitter printing layer that satisfies Condition 2, it is possible to observe reflected light that deviates from the vicinity of the specular reflection direction. Metallic luster can be felt over a wide range within the surface, making it possible to achieve an extremely high level of design. This effect can be felt more markedly in flexible packaging in which the base material and intermediate base material are plastic films.
In other words, the packaging material of the present invention that satisfies the above conditions is effective in all environments (environments where luxury products such as cosmetics are displayed using spot light sources, indoor environments where multiple light sources are present, etc.). However, it can be particularly effective in indoor environments where multiple light sources exist (particularly in retail stores such as supermarkets, convenience stores, drug stores, etc.).

In addition, since the packaging material of the present invention has the glitter print layer formed on the inner layer side of the plastic film, if the surface shape of the plastic film is smooth, the surface shape of the glitter print layer as seen from the viewer side becomes smooth. The above-mentioned effects can be obtained even though the surface shape of the glitter printing layer seen from the viewer side is smooth. In other words, the packaging material of the present invention can give the viewer a sense of metallic luster from a wide angle, even though it looks almost smooth, and can achieve a design that cannot be achieved with conventional packaging materials.

G60/L ^* SCE is preferably 0.90 or less, more preferably 0.85 or less.
In addition, if G60/L ^* SCE is too small, the glitter pigment in the glitter print layer will tilt too much and the diffusion will become too strong, and the brightness will not turn on and off depending on the viewing angle, making it difficult to perceive metallic luster. There are cases. Therefore, G60/L ^* SCE is preferably 0.2 or more, more preferably 0.3 or more, even more preferably 0.4 or more, and even more preferably 0.5 or more. More preferred.

<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 glitter print layer 3a can be visually recognized from the outside.
Specifically, polyolefin resins such as polyethylene (PE) and polypropylene (PP), cyclic polyolefin resins, polystyrene resins, acrylonitrile-styrene copolymer (AS) resins, and acrylonitrile-butadiene-styrene copolymers. (ABS) resin, poly(meth)acrylic resin, polycarbonate resin, polyvinyl alcohol resin, ethylene-vinyl alcohol copolymer (EVOH), saponified ethylene-vinyl ester copolymer, polyethylene terephthalate (PET), and Polyester resins such as butylene terephthalate (PBT) and polyethylene naphthalate (PEN), polyamide resins such as various nylons (Ny), polyurethane resins, acetal resins, cellulose resins, polyvinylidene chloride resins (PVDC), etc. can be mentioned. The plastic film may be uniaxially stretched or biaxially stretched. Alternatively, 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 processing. Examples of resins constituting the plastic film having excellent heat resistance include polyester resins and polyamide resins.
Specific examples of plastic films with excellent heat resistance include single polyester films, single polyamide films such as nylon, and composite films containing one or more of polyester films and polyamide films. Examples of the composite film include a coextruded stretched film having a structure of PET/Ny/PET and PET/Ny from the outer layer side. Further, as the composite film, it is also preferable to combine one or more types of polyester film and polyamide film with one or more types of ethylene-vinyl alcohol copolymer film and polyvinylidene chloride film.

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

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

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

<Glitter printing layer>
The packaging material of the present invention has a glitter print layer containing a glitter pigment and a binder resin between the plastic film and the sealant layer.
The glitter 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, a pattern printing layer 3b may be provided on a part of the outer layer side of the glitter printing layer 3a. Further, as shown in FIG. 3, the packaging material may have a glitter print layer 3a and a pattern print layer 3b arranged in parallel at the same position in the thickness direction of the packaging material.
Furthermore, pictures such as letters, figures, symbols, designs, patterns, etc. may be formed using the glitter printing layer 3a.

The thickness of the glitter printing layer is preferably 0.1 to 8.0 μm, more preferably 0.3 to 5.0 μm, from the viewpoint of sufficiently impressing metallic luster. .

<<Glitter pigment>>
The glitter pigment preferably contains at least one selected from metal scales and pearl pigments.

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

A white pearl pigment is obtained by covering a scale-like base material such as mica, aluminum, or 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 at about 15 μm and reflects almost all wavelengths of light, so it appears 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, exceeding 0.15 μm. Depending on the thickness, reflected light and transmitted light change, producing various interference colors. Sometimes called iris-colored pearls.
Colored pearl pigments are chromatic, and the coating layer is made of a colored high refractive index material such as ferric oxide, and the white pearl pigment is further surrounded by a colored high refractive index material such as ferric oxide or other colored material. There are those coated with pigments, and those with pigments and other coloring agents added to the coating layer.

The pearl pigment preferably has an average length of 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 lengths of any 20 particles (pearl pigments or metal scales) observed using an optical microscope or an electron microscope from the plane direction of the packaging material. It is required as. Note that the length of one pearl pigment and metal scale means the maximum length of one pearl pigment and metal scale in the plane direction.

Further, 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 metal scales is determined as the average value of the thickness of 20 arbitrary particles (pearl pigment or metal scales) obtained by observing the cross section of the packaging material using an optical microscope or an electron microscope. The thickness of one pearl pigment and metal scale is determined by dividing the cross-sectional image of one pearl pigment and metal scale into five regions of equal length in the length direction, and calculating the thickness of the central part of each region ( t ₁ , t ₂ , t ₃ , t ₄ , t ₅ ) and mean the average of t ₁ to t ₅ .

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

Examples of the material of the metal scales include metals and alloys such as aluminum, gold, silver, brass, titanium, chromium, nickel, nickel-chromium, and stainless steel.
Metal scales include, for example, those obtained by vacuum-depositing the metal or alloy on a plastic film, peeling the metal thin film from the plastic film, crushing and stirring the peeled metal thin film, or powder of the metal or alloy. and a solvent, and spread and/or crush the powder using a media stirring mill, ball mill, attritor, etc., or those whose surfaces are coated with a resin can be used. can.

The metal scales are preferably non-leafing type metal scales. With non-leafing type metal scales, the metal scales are uniformly dispersed within the layer during the formation process of the glitter print layer, so even if the metal scales are tilted in the glitter print layer, the spacing between the metal scales may become narrower. Therefore, it is possible to suppress the generation of sparks and heat generation of the packaging material when heated in a microwave oven.
Non-leafing type metal scales are metal scales whose surface has not been treated with stearic acid, such as metal phosphorus pieces whose surface has been treated with a surface treatment agent other than stearic acid such as oleic acid, and metal phosphorus whose surface has not been surface treated. Examples include pieces.

The surface of the metal scale is preferably coated with a resin. Resin-coated metal scales prevent the spacing between the metal scales from narrowing even if the metal scales are tilted in the glitter printing layer, which reduces the generation of sparks and heat generation of the packaging material when heated in a microwave oven. It can be suppressed.
Resin-coated metal scales can be produced, for example, by the methods described in JP-A-62-253668, JP-A-64-40566, JP-A-2003-213157, and JP-A-2012-241039. .

From the viewpoint of uniform dispersibility in the glitter printing layer, the metal scales preferably have an average length of 1 to 50 μm, more preferably 2 to 40 μm, and still more preferably 5 to 30 μm. In addition, from the viewpoint of ease of handling and obtaining high metallic luster, the average thickness is preferably 0.01 to 5 μm, more preferably 0.02 to 3 μm, and even more preferably 0.05 to 1 μm.

The content of metal scales in the glitter print layer should be 3% by mass or more and 50% by mass or less of the total solid content of the glitter print layer, from the viewpoint of satisfying condition 1 and improving microwave resistance. is preferable, more preferably 3% by mass or more and less than 40% by mass, still more preferably 10% by mass or more and less than 30% by mass.

The aspect ratio (average length/average thickness) of the luster pigments such as pearl pigments and metal scales is preferably less than 30, more preferably 25 or less. By setting the aspect ratio of the glitter pigment to less than 30, the glitter pigment becomes more likely to tilt within the glitter print layer, making it easier to satisfy Condition 2.
Note that if the aspect ratio of the glitter pigment is too small, the glitter pigment may tilt excessively within the glitter print layer, making it impossible to obtain a sufficient metallic luster. Therefore, the aspect ratio of the glitter pigment is preferably 10 or more, more preferably 15 or more.

Examples of the binder resin in the glitter 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 resins. 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, Alkyd resin, epoxy resin, unsaturated polyester resin, thermosetting poly(meth)acrylic resin, melamine resin, urea resin, polyurethane resin, phenolic resin, xylene resin, maleic acid resin, nitro resin Examples include cellulose resins such as cellulose, ethyl cellulose, acetyl butyl cellulose, and ethyloxyethyl cellulose, rubber resins such as chlorinated rubber 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 coloring agent may be contained in the glitter printing layer in order to improve the design.
As colorants, general-purpose dyes and pigments (e.g., inorganic pigments such as yellow lead, titanium yellow, Bengara, cadmium red, ultramarine blue, and cobalt blue, and organic pigments such as quinacridone red, isoindolinone yellow, and phthalocyanine blue) are used. can be used. Note that from the viewpoint of microwave resistance, it is preferable that a colorant with low insulation properties such as carbon black be used in a very small amount.
When the colorant is a pigment, the average particle diameter is preferably 250 nm or less. By setting the average particle diameter of the pigment to 250 nm or less, light diffusion by the pigment can be suppressed and metallic luster can be easily improved. The average particle diameter of the pigment is determined as the mass average value d50 in particle size distribution measurement using a laser light diffraction method.

The content of the colorant is preferably 10 to 70 parts by weight, more preferably 20 to 60 parts by weight, and even more preferably 30 to 50 parts by weight, based on 100 parts by weight of the bright pigment. preferable.

The glitter printing layer preferably contains inorganic particles (hereinafter sometimes referred to as "inorganic fine particles") having an average particle diameter of 1 to 100 nm.
By containing inorganic fine particles in the glitter print layer, the glitter pigment is suppressed from sinking below the glitter print layer, and the glitter pigment is easily arranged uniformly in the glitter print layer. Condition 2 can be easily satisfied by multiple reflections.
The average particle diameter of the inorganic fine particles is more preferably 2 to 50 nm, and even more preferably 5 to 30 nm. The average particle diameter of the inorganic fine particles is determined as the mass average value d50 in particle size distribution measurement using a laser light diffraction method.

The content of inorganic fine particles in the glitter printing layer is preferably 10 to 70 parts by mass, more preferably 15 to 50 parts by mass, and more preferably 20 to 35 parts by mass, based on 100 parts by mass of the glitter pigment. It is more preferable that it is part.

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

The glitter printing layer may contain fillers, stabilizers, plasticizers, antioxidants, light stabilizers such as ultraviolet absorbers, dispersants, thickeners, desiccants, lubricants, antistatic agents, etc., as necessary. Any additives such as crosslinking agents and crosslinking agents can be added.

The glitter printing layer 3a, the pattern printing layer 3b, and the solid printing layer 3d (hereinafter, these may be collectively referred to as "printing layers"), which will be described later, are, for example, on the plastic film 2, the sealant layer 4, etc. It can be formed by a known printing method such as a gravure printing method, an offset printing method, a letterpress printing method, or a silk screen printing method.
The printing layer is preferably formed by back printing on the inner layer side surface of the plastic film 2 or the gas barrier layer. Alternatively, it may be formed by surface printing on the surface of the outer layer side of the intermediate base material layer 5 or the sealant layer 4, and then bonding it to the plastic film 2 or the gas barrier layer via an adhesive layer. . Furthermore, the packaging material 1 may be printed entirely or partially.

<Picture printing layer>
The packaging material of the present invention may have a pattern printing layer 3b between the plastic film 2 and the sealant layer 4. For example, the pattern printing layer 3b may be formed on the outer layer side of the glitter printing layer 3a (FIG. 2), or it may be formed in parallel with the glitter printing layer 3a at the same position in the thickness direction of the packaging material. Yes (Figure 3). In addition, in order to prevent the arrangement of the glitter pigments from being excessively disturbed by the solvent contained in the coating solution for forming the pattern printing layer, the pattern printing layer is formed in parallel with the glitter printing layer, or the pattern printing layer is formed in parallel with the glitter printing layer. It is preferable to form it on the outer layer side.

The pattern printing layer 3b is preferably a printing layer formed of a color that can be distinguished from the glitter printing layer 3a, and has a broad concept including characters, figures, symbols, designs, patterns, solid printing, etc. The coloring agent for the pattern printing layer 3b may be a general-purpose dye or pigment (for example, inorganic pigments such as yellow lead, titanium yellow, Bengara, cadmium red, ultramarine blue, cobalt blue, etc., 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.

In addition, as shown in FIG. 2, by forming the pattern printing layer 3b on the outer layer side of the glitter printing layer 3a and configuring the pattern printing layer 3b to have light transparency, areas where metallic luster is felt. This is preferable because it can increase the color tone and improve the design.
In addition, as a means of increasing the color in areas where metallic luster is felt, there is also a method of adding a coloring agent into the glitter printing layer, but it is also possible to add a light-transmitting pattern printing layer on the outer layer side of the glitter printing layer. Preferably, the means for forming In the method of forming a light-transmitting pattern printing layer on the outer layer side of the glitter printing layer, most of the colorants are almost certainly exposed to outside light, and the light reflected by the glitter printing layer does not regenerate the pattern printing layer. Since it passes through, the amount of coloring agent used can be reduced when trying to impart the same color. In addition, since the pattern printing layer usually expresses the color tone with multiple colorants, by creating a structure in which the light reflected by the glitter printing layer passes through the pattern printing layer again, each colorant is uniformly illuminated. It is preferable in that it can apply the same amount of color and suppress color unevenness. Furthermore, the method of forming a light-transmitting pattern printing layer on the outer layer side of the glitter printing layer is also suitable in that it is easy to increase the content of the glitter pigment in the glitter printing layer.

The colorant for the light-transparent pattern printing layer includes general-purpose dyes and pigments (for example, inorganic pigments such as yellow lead, titanium yellow, Bengara, cadmium red, ultramarine blue, and cobalt blue, quinacridone red, isoindolinone yellow, 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 due to the glitter printing layer may be reduced. Furthermore, since pigments with a large average particle diameter have strong diffusion, there is a concern that the metallic luster may be reduced.
For this reason, the coloring agent for the pattern printing layer having light transparency is preferably a pigment having an average particle diameter of 100 nm or more and less than 380 nm.

The content of the colorant in the light-transmitting pattern printing layer is preferably 3 to 50 parts by weight, more preferably 5 to 20 parts by weight, and more preferably 7 to 20 parts by weight, based on 100 parts by weight of the binder resin. More preferably, the amount is 15 parts by mass.
The thickness of the light-transmitting pattern printing layer is preferably 0.1 to 1.0 μm, more preferably 0.1 to 0.6 μm, and still more preferably 0.2 to 0.4 μm.

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

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. It 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 one or more types of colorants selected from white pigments such as titanium oxide such as titanium dioxide, barium sulfate, magnesium oxide, calcium carbonate, zinc oxide, and lead white.
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.

<Sealant layer>
The inner layer side of the sealant layer 4 comes into direct contact with the packaged item and plays a role in protecting the packaged item. In particular, when the packaging material 1 is used to form a packaging container for a liquid, the sealant layer 4 is preferably made of a material that does not allow the liquid to penetrate. Further, it is preferable that the innermost layer of the sealant layer 4 has heat sealability for forming a pouch.

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

In order to increase heat resistance from the viewpoint of heating in a microwave oven and retort processing, the sealant layer is preferably composed of a resin with excellent heat resistance. Specifically, the sealant layer is made of a resin having excellent heat resistance. Propylene-based resins such as polymers, ethylene-propylene random copolymers, and HDPE are preferred.
Moreover, it is preferable to use the propylene-based resin properly depending on the purpose. Specifically, ethylene-propylene block copolymers are preferable when cold resistance is important (for example, packaging materials for frozen foods), and ethylene-propylene random copolymers are preferable when transparency is important. If sexiness is important, propylene homopolymer is preferred. Further, in the case of a container equipped with an automatic steaming mechanism, an ethylene-propylene block copolymer is preferable from the viewpoint that the seal strength decreases at high temperatures, making it easier to release steam.

Furthermore, when the packaging material 1 forms a lid of a container with a lid, the sealant layer 4 preferably has easy-peel properties.
Easy peel property refers to the property that, for example, when the sealant layer 4 of the packaging material 1 of the lid of a lidded container is bonded to the container body, the lid is easily peeled off from the container body when the lidded container is opened. say.
A sealant layer having easy peel properties is made of two or more resins, one resin (resin that has good adhesion to the container body) and another resin (resin that does not have good adhesion to the container body, and It can be formed by mixing one resin and an incompatible resin. Such resins differ depending on the material of the container, so it cannot be generalized, but if the container is made of PP, one resin (a resin with good adhesion to the container body), PP, and the other resin. By forming a sealant layer from a resin mixed with 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 first resin), Easy peelability can be imparted to PP containers.
Note that the sealant layer may have a multilayer structure, and easy peelability may be imparted only to the side of the sealant layer that is 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 depending on the use of the packaging material 1 and the type and properties of the packaged item, but it 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, and even more preferably 30 to 100 μm. Further, in the case of a container with a lid, the thickness of the sealant layer 4 is more preferably 15 to 80 μm, and still more preferably 20 to 60 μm.

<Gas barrier layer>
A gas barrier layer can be provided anywhere 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. Furthermore, it may also provide light-shielding properties that block 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 two or more layers.
When the gas barrier layer is formed on the outer layer side of the glitter print layer 3a, like the plastic film 2, it is made of a light-transmitting material so that the glitter print layer 3a can be visually recognized from the outside. .

The gas barrier layer can be formed as a vapor deposited film or a coated film by a known method. Note that the surface on which the gas barrier layer is to be formed may be subjected to a surface treatment 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, oxidizing agent treatment, and application of an anchor coating agent.

[Vapor deposited film]
Examples of vapor deposited films that are examples of gas barrier layers include silicon (Si), aluminum (Al), magnesium (Mg), calcium (Ca), potassium (K), tin (Sn), sodium (Na), and boron ( B), titanium (Ti), lead (Pb), zirconium (Zr), yttrium (Y), or other inorganic materials or oxides thereof. Among these, when the packaging material is for use in a microwave oven, silicon oxide, aluminum oxide, magnesium oxide, etc. Inorganic oxides such as are preferred.
Methods for forming the deposited film include, for example, physical vapor deposition (PVD) methods such as vacuum evaporation, sputtering, and ion plating, and chemical vapor deposition (CVD) methods such as plasma chemical vapor deposition, thermal chemical vapor deposition, and photochemical vapor deposition. Laws etc.
The vapor deposited film disposed on the outer layer side of the printed layer such as the glitter printed layer is preferably a vapor deposited film of an inorganic oxide from the viewpoint of visibility of the printed layer.

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

[Gas barrier coating film]
A gas barrier coating film, which is an example of a gas barrier layer, has the general formula R ¹ _n M (OR ² ) _m (wherein R ¹ and R ² are organic groups having 1 to 8 carbon atoms, and M is a metal atom). n is an integer of 0 or more, m is an integer of 1 or more, and n+m is the valence of M.) at least one alkoxide represented by A coating solution obtained by polycondensing an alcohol copolymer by a sol-gel method in the presence of a sol-gel catalyst, an acid, water, and an organic solvent is applied, and the coating solution is heated at 50 to 300°C to 0. It can be formed by heat treatment for 0.05 to 60 minutes.
The coating method may be, for example, roll coating such as a gravure roll coater, spray coating, spin coating, dipping, brush coating, bar coating, applicator, or other coating means. The dry 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 applications.
The gas barrier coating film is preferably formed on the surface of the deposited film from the viewpoint of improving gas barrier properties.

Examples of the packaging material having a gas barrier layer include the following laminated structures (1') to (6'). Note that in (1') to (6') below, the layer on the left side is the outer layer side, and "/" means the boundary between each layer.
(1') Plastic film/Inorganic oxide vapor deposited film/Glitter printed layer/Sealant layer (2') Plastic film/Inorganic oxide vapor deposited film/Gas barrier coating film/Glitter printed layer/Sealant layer (3') ) Plastic film/Glitter printed layer/Vapor deposited film/Intermediate base material layer/Sealant layer (4') Plastic film/Glitter print layer/Gas barrier coating film/Vapor deposited film/Intermediate base material layer/Sealant layer (5') Plastic film / Vapor deposited film of inorganic oxide / Bright printing layer / Adhesive layer / Intermediate base material layer / Adhesive layer / Sealant layer (6') Plastic film / Vapor deposited film of inorganic oxide / Gas barrier coating film / Bright printing layer/adhesive layer/intermediate base material layer/adhesive layer/sealant layer The vapor-deposited films (3') and (4') are preferably vapor-deposited films of inorganic oxides.

<Intermediate base material layer>
The intermediate base material layer may be used as necessary to improve the strength and processability of the packaging material 1, to change the texture of the packaging material, or to be used as a base material for forming other layers. This is a layer provided by Examples of the constituent material of the intermediate base layer include 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 glitter print layer 3a can be used.
In the case of paper, the packaging material 1 can be given properties such as shapeability, bending resistance, and rigidity, such as high-size bleached or unbleached kraft paper, pure white roll paper, paperboard, etc. 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 soft 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 order to increase the heat resistance of the packaging material in consideration of heating in a microwave oven and retort treatment, it is preferable that the intermediate base material layer has excellent heat resistance. Specific examples of the intermediate base material layer having excellent heat resistance include paper and the various plastic films exemplified as plastic films having excellent heat resistance.

<Adhesive layer>
In the packaging material 1, each constituent layer may be laminated with an adhesive layer 6 interposed therebetween from the viewpoint of improving the bonding strength between each layer. The adhesive layer can be formed by a method using a known dry laminating adhesive.

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

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

<Thermosoftening resin layer>
As shown in FIG. 9, the packaging material 1 may have a heat-softening resin layer 7 in a part of the region between the plastic film and the sealant layer.
The thermosoftening resin layer 7 is formed in a part of the vicinity of the edge of the packaging material 1 as shown in FIG. By being composed of a resin that loses a certain level of strength in a high-temperature environment, when heated in a microwave oven and the pressure inside the packaging container increases, part of the sealant layer will break and the heat-softening resin layer will break. A part of the material undergoes interfacial delamination or cohesive failure, allowing steam to escape. The details will be explained in the second embodiment A of the automatic steaming mechanism.

Thermoplastic resins, that is, resins that have a specified strength in a temperature environment below room temperature but whose specified strength decreases in a high temperature environment, have a melting point of 60 to 110°C, preferably 60 to 90°C. Examples of resins include ethylene-vinyl acetate copolymer resins, polyamides, nitrified cotton, and polyethylene wax, and mixed resins of polyamide, nitrated cotton, and polyethylene wax are preferred. As the resin containing polyamide, nitrified cotton, and polyethylene wax, MWOP varnish (softening point: 105° C.) manufactured by DIC Graphics Corporation can be used.

The thickness of the thermosoftening resin layer is preferably 1 to 5 μm. By setting the thickness of the heat-softening resin layer to 1 μm or more, the heat-softening resin layer and the sealant layer can be easily destroyed when heated in a microwave oven. Further, by setting the thickness of the thermosoftening resin layer to 5 μm or less, when the film-like packaging material is rolled up, it is possible to suppress the formation of a bulge in a part and the stretching of the packaging material in that part.

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

The heat-generating printed layer is a printed layer containing a conductive agent.
Examples of the conductive agent include one or more selected from conductive polymers and conductive particles.
Examples of conductive polymers include polyaniline, polythiophene, and polyacetylene. Conductive particles include carbon black and metal particles.
When using conductive particles as the conductive agent, the heat-generating print layer preferably contains a binder resin. Further, even when using a conductive polymer as a conductive agent, other resins may be contained in order to adjust the conductivity.
As the resin other than the conductive polymer for the heat-generating print layer, the same resins as those exemplified as the binder resin for the glitter print layer can be used.

The thickness of the heat-generating printed 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, 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 adjusted as appropriate depending on the form of the packaging material.
Further, it is preferable that the heat generating printed layer has a resistance value of 0.1 kΩ to 50 kΩ when measured with a distance of 5 mm between the terminals of a 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 glitter print layer. By having a transparent matte layer, the design can be improved by the gloss matte effect, and the slippage of the hand when opening the packaging container can be suppressed.

In order to prevent the hand from slipping when opening the packaging container, the transparent matte layer should be applied to at least a portion of the plastic film near the edge of the surface opposite to the glitter print layer. It is preferable that it be formed. Near the edge refers to an area within 3 mm from the edge of the packaging material.
In addition, from the viewpoint of further suppressing slippage, it is preferable to further emboss the area where the transparent mat layer is formed.

The transparent matte layer preferably contains a matting agent and a binder resin.
As the matting agent, particles made of inorganic substances such as silica, alumina, calcium carbonate, aluminosilicate, barium sulfate, etc. are preferable. Also, among these, silica is preferred because of its excellent transparency.
Examples of the shape of the matting agent include spherical, polyhedral, scaly, and irregular shapes. Among these, an amorphous shape is preferable from the viewpoint of suppressing slippage.

The average particle diameter of the matting agent is preferably 0.1 to 15.0 μm, more preferably 1.0 to 10.0 μm, even more preferably 2.0 to 7.5 μm, 2. Even more preferably, the thickness is 7 to 5.0 μm. The average particle diameter of the particles of the matting agent is measured as a mass average value d50 in particle size distribution measurement using a laser light diffraction method.

The matting agent preferably has an oil absorption of 250 [g/100g] or more. By using a matting agent with an oil absorption of 250 g/100 g or more, the matting agent absorbs water and prevents the formation of a thin film of water on the surface of the transparent mat layer, which prevents slipping of wet hands. It can be easily suppressed.
The oil absorption amount of the matting agent is preferably 270 [g/100g] or more, more preferably 280 [g/100g] 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 will become too strong and it will be difficult to control the matte feeling, so it should be 600 [g/100 g] or less. It is preferably at most 500 [g/100g], more preferably at most 400 [g/100g].
The oil absorption was measured according to JIS K5101-13-2, "Pigment test method - Part 13: Oil absorption - Section 2: Boiled linseed 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 40.0% by mass. More preferably, it is 30.0% by mass.

As the binder resin for the transparent mat layer, a general-purpose thermoplastic resin or a 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 of polyol and isocyanate is preferred.

The thickness of the transparent matte 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.

The above-mentioned packaging material of the present invention can be used for various packaging materials, but it can be suitably used for food and cosmetic packaging materials, etc., since it can give an impression of the high quality of the contents to the purchaser. .

[Packaging container]
The packaging container of the present invention is at least partially formed of the packaging material of the present invention described above.
By forming at least a portion of the packaging container with the packaging material of the present invention, a packaging container with a high-class feel due to metallic luster can be obtained even if metal itself is not used.
The packaging material of the present invention may be applied to a desired portion of the packaging container where it is desired to impart a luxurious feel due to metallic luster. The packaging material may be used for.

The type and use of the packaging container of the present invention are not particularly limited, but when selling the contents contained in the packaging container, the packaging container can impress the purchaser with the luxury of the contents. For example, it can be suitably used for food containers, cosmetic containers, etc.
Examples of packaging containers include pouches and containers with lids, as well as cups and trays. These packaging containers partially include the above-mentioned packaging material. That is, these packaging containers may be formed of a packaging material containing paper as an intermediate base material layer.
The specific shape of the pouch includes, for example, the shape of a microwave oven pouch shown in FIG. 6, which will be described later. Note that the pouch may be a retort container (a container sterilized at high temperature and high pressure), and may also be a packaging container for a microwave oven or a container other than a retort container.
A specific shape of the container with a lid includes a container main body having a storage part, and a lid body joined to the container body so as to seal the storage part, and the lid body Examples include those made of packaging material.
The packaging container can be suitably used in a microwave oven as described above. Moreover, 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 microwave ovens.

When the packaging container is a microwave oven container or a retort container, the packaging material constituting the container preferably has a laminated structure of any one of (1) to (4) above.
In this case, as the plastic film, it is preferable to use a single polyester film, a single polyamide film such as nylon, or a composite film containing one or more types of polyester film and polyamide film.
In this case, 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 types of polyester film and polyamide film, and paper.
Further, in this case, as the sealant layer, propylene-based resins such as propylene homopolymer, ethylene-propylene block copolymer, ethylene-propylene random copolymer, etc., and HDPE are preferable.
More specifically, in the case of a retort container or a microwave oven container, the packaging material constituting the container preferably has a laminated structure of any one of the following (A1) to (A14). Note that "/" means the boundary between each layer. Furthermore, in (A1) to (A14), PET is preferably a stretched film. Moreover, ONy means stretched nylon.

(A1) PET/Glitter print layer/ONy/Ethylene-propylene block copolymer (A2) PET/Gas barrier layer/Glitter print layer/ONy/Ethylene-Propylene block copolymer (A3) PET/Glitter print layer /Gas barrier layer/ONy/Ethylene-propylene block copolymer (A4) PET/Glitter print layer/PET/Ethylene-Propylene block copolymer (A5) PET/Gas barrier layer/Glitter print layer/PET/Ethylene-Propylene Block copolymer (A6) PET/Glitter printed layer/Gas barrier layer/PET/Ethylene-propylene block copolymer (A7) Coextruded stretched film (PET/Ny/PET)/Glitter printed layer/PET/Ethylene- Propylene block copolymer (A8) coextruded stretched film (PET/Ny/PET)/gas barrier layer/glitter printing layer/PET/ethylene-propylene block copolymer (A9) coextruded stretched film (PET/Ny/PET) )/Glitter printed layer/Gas barrier layer/PET/Ethylene-propylene block copolymer (A10) coextruded stretched film (PET/Ny)/Gas barrier layer/Printed layer with glitter print layer/Adhesive layer/PET/ Adhesive layer/Ethylene-propylene block copolymer (A11) coextruded stretched film (PET/Ny)/Printed layer with glitter printing layer/Adhesive layer/Gas barrier layer/PET/Adhesive layer/Ethylene-propylene block Copolymer (A12) PBT/Glitter printed layer/ONy/Ethylene-propylene block copolymer (A13) PBT/Gas barrier layer/Glitter printed layer/ONy/Ethylene-Propylene block copolymer (A14) PBT/Glitter Gas barrier layer / gas barrier layer / ONy / ethylene-propylene block copolymer The gas barrier layers of A2, 5, 8, 10 and 13 are a single layer of a vapor deposited film of an inorganic oxide or a vapor deposited film of an inorganic oxide. A composite layer in which a gas barrier coating film is formed (in the composite layer, the vapor-deposited film of the inorganic oxide is disposed on the PET or coextruded stretched film side) is preferable. In addition, the gas barrier layers of A3, 6, 9, 11 and 14 are a single layer of a vapor deposited film, or a composite layer in which a gas barrier coating film is formed on a vapor deposited film (in this composite layer, the vapor deposited film is on the ONy or PET side). It is preferable that the

In the case of a microwave oven container, the ethylene-propylene block copolymer forming the sealant layers (A1) to (A14) above may be a polyethylene resin such as LDPE, LLDPE, MDPE, or HDPE.
In addition, when adopting the structure of the automatic steaming mechanism of the second embodiment A or B described later in a container for a microwave oven, the above-mentioned heat softening resin layer is provided in a part between the plastic film and the sealant layer. Alternatively, a heat-generating printed layer may be formed.

<Pouch>
FIG. 6 shows an example of a pouch that is an embodiment of the packaging container of the present invention. The pouch 10 in FIG. 6 is for use in a microwave oven, and is a standing type pouch formed by heat-sealing a body part 11 and a bottom part 12. As shown in FIG. 6, the body 11 includes a pair of main sheets 13 consisting of a front main sheet 13a and a back main sheet 13b, which are arranged to face each other. The vicinity of side edges 14 of the sheets 13 are heat-sealed to each other. A bottom sheet 16 forming the bottom portion 12 is arranged between the lower edges 15 of the pair of main sheets 13.
Then, a storage space 17 for accommodating the contents is formed in a region surrounded by the pair of main sheet 13 and bottom sheet 16. The bottom sheet 16 is bent into a convex shape toward the accommodation space 17, and the vicinity of its periphery is heat-sealed together with the lower part of the overlapping main sheet 13. Since the bottom sheet 16 maintains the shape of the lower ends of the pair of main sheets 13, the pouch 10 is given independence and can be made into a standing pouch.
In the pouch 10 of FIG. 6, an opening 19 is formed between the upper edge 18 of the front main surface sheet 13a and the back main surface sheet 13b, and the contents can be accommodated through the opening 19. After storing 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 taking out the contents from the pouch 10, the pouch 10 is opened by tearing the vicinity of the upper edge 18 from the notch 23.

The front main sheet 13a, the back main sheet 13b, and the bottom sheet 16 of this pouch 10 can be formed from the packaging material 1. All of these sheets may be formed of the packaging material 1 having the glitter print layer 3a containing metal scales, or only one sheet requiring metallic luster may be formed of the packaging material 1. Good too. FIG. 6 shows that the front main surface sheet 13a is formed of the packaging material 1 having a laminated structure as shown in FIG. 2, and has a glitter print layer 3a and a pattern print layer 3b. .
Note that sheets other than the sheet in which the packaging material 1 is used may be, for example, the packaging material 1 in which the glitter print layer 3a containing metal scales is not formed, or the sheet does not include a print layer. .

<Automatic steaming mechanism>
If the container is for use in a microwave oven, when the pressure inside the pouch increases due to steam generated from cooking the food, etc. inside, the steam inside 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 steaming mechanism is preferably formed near the periphery of the container.

A first embodiment of the automatic steaming mechanism will be described with reference to FIG. The microwave pouch shown in FIG. 6 has a first unsealed area 21 that is not heat-sealed near the upper side edge 14 of the container (pouch). The first unsealed region 21 reaches the side edge 14 and has an opening 22 . Further, the first unsealed area 21 projects toward the accommodation space 17 side. Further, the heat seal portion 25 extends toward the accommodation space 17 so as to surround the first unsealed region 21 extending toward the accommodation space 17, forming an overhang portion 25a. More specifically, the first unsealed region 21 and the accommodation space 17 are separated from each other, and a projecting portion 25a is formed so as to be connected to a heat sealing portion 25 for sealing the pouch. .
In the microwave oven pouch shown in FIG. 6, the automatic steaming mechanism 20 is formed by the opening 22, the first unsealed area 21, and the heat-sealed part (projection part 25a) projecting toward the housing space 17 as described above. has been done. Specifically, when the pressure inside the container increases due to heating, the overhanging portion 25a of the heat seal portion 25 receives a strong load, and the overhanging region 25 peels off first. The space 17 and the first unsealed area 21 communicate with each other, allowing steam to escape to the outside.
Further details of the automatic steaming mechanism of the type shown in FIG. 6 are described in JP2015-120550A, JP2016-74457A, and JP2016-74458A.

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

A second embodiment A of the automatic steaming mechanism will be described with reference to FIGS. 9 to 11.
The packaging container (pouch) 10 shown in FIG. 10 has an edge of the packaging material shown in FIG. It is made into a pouch by heat-sealing the area around it. 11 is a cross-sectional view taken along line XI-XI of the heat-sealed portion 25 around the edge of the packaging container 10 in FIG.
As shown in FIG. 10, the heat-softening resin layer 7 is formed in at least a partial area of the heat-sealing portion 25 of the packaging container 10, extending from the inner edge to the outer edge of the heat-sealing portion 25 for sealing the pouch. It is necessary that the The heat-softening resin layer 7 provided at such a position is heated in a microwave oven to a high temperature, thereby reducing its strength.
As shown in FIG. 11, when the heat-softening resin layer 7 is heated in a microwave oven or the like and the internal pressure increases due to the expansion of the air in the packaging container 10 or the water vapor contained in the contents, the thermoplastic resin layer 7 A part of the sealant layer 4 is destroyed, and a part of the heat-softening resin layer 7 undergoes interfacial peeling or cohesive failure starting from an arbitrary point "A" of the sealant layer 4 (the broken line with symbol B indicates the sealant (The figure shows a virtual line where the layer 4 breaks and a virtual line where the thermoplastic resin layer 7 shows interfacial peeling or cohesive failure.) As a result, air and water vapor escape from the broken portion, and the internal pressure of the packaging container 10 can be reduced.
Note that the automatic steaming 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 equipped with the second embodiment A of the automatic steaming mechanism, it is preferable to select a resin that is easily disintegrated as the resin constituting the sealant layer. Specifically, polyethylene films such as LDPE and LLDPE (copolymer of butene-1 and ethylene) are preferred. Further, it is preferable that the packaging material constituting the container equipped with the second embodiment A of the automatic steaming mechanism has a laminated structure of any one of the following (B1) to (B4). Note that "/" means the boundary between each layer. Furthermore, in (B1) to (B4), PET is preferably a stretched film. Moreover, ONy means stretched nylon.

(B1) PET/glitter printing layer/thermosoftening resin layer/sealant layer (polyethylene film)
(B2) PET/gas barrier layer/glossy printing layer/thermosoftening resin layer/sealant layer (polyethylene film)
(B3) ONy/Glitter printing layer/Thermosoftening resin layer/Sealant layer (polyethylene film)
(B4) ONy/Gas barrier layer/Glitter printed layer/Thermosoftening resin layer/Sealant layer (polyethylene film)
The gas barrier layers B2 and B4 are a single layer of a vapor-deposited film of an inorganic oxide, 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, a vapor-deposited film of an inorganic oxide is formed on a vapor-deposited film of an inorganic oxide). (disposed on the PET or ONy side) is preferable.

Furthermore, as a second embodiment B of the automatic steaming mechanism, there is a method of using a packaging material having a heat-generating printed layer in a part of the region between the plastic film and the sealant layer.
In the second embodiment B of the automatic vaporization mechanism, the heat-sealed portion Among them, the sealed state of the part corresponding to the heat generating area is released, and automatic vaporization can be performed.
The automatic steaming mechanism of the second embodiment B can be applied to pouches and containers with lids, which will be described later.

As for the packaging material constituting the container equipped with the second embodiment B of the automatic steaming mechanism, the resin constituting the sealant layer is preferably one containing propylene as a main component. Specifically, a film made of a mixed resin of propylene and polyethylene is preferred. Further, it is preferable that the packaging material constituting the container equipped with the second embodiment B of the automatic steaming mechanism has a laminated structure of any one of the following (B1') to (B4'). Note that "/" means the boundary between each layer. Furthermore, in (B1') to (B4'), PET is preferably a stretched film. Moreover, ONy means stretched nylon.

(B1') PET/Glitter printed layer/Heat-generating printed layer/Sealant layer (film made of mixed resin of propylene and polyethylene)
(B2') PET/gas barrier layer/glossy printed layer/heat-generating printed layer/sealant layer (film made of mixed resin of propylene and polyethylene)
(B3') ONy/Glitter printed layer/Heat-generating printed layer/Sealant layer (film made of mixed resin of propylene and polyethylene)
(B4') ONy/Gas barrier layer/Glitter printed layer/Heat-generating printed layer/Sealant layer (film made of mixed resin of propylene and polyethylene)
The gas barrier layers B2' and B4' are a single layer of a vapor-deposited inorganic oxide film, 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, a vapor-deposited inorganic oxide film is formed on a vapor-deposited film of an inorganic oxide) It is preferred that the membrane is PET or placed on the ONy side).

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

It is preferable that the lid body 33 of this lidded container 30 is formed of the packaging material 1 of the present invention. Note that FIG. 7 shows that the lid 33 is formed of the packaging material 1 having a laminated structure as shown in FIG. .

The lid 33 has easy-peel properties, as described in the description of the sealant layer 4 of the packaging material 1 above, from the viewpoint of making it easier to peel off the lidded container 30 from the container body 32 and open the lidded container 30. It is preferable.
Specifically, the lid 33 and the container body 32 are joined at a joining line 35 of the flange portion 34 of the container body 32. For example, the joining line 35 may be formed by heat sealing the lid 33 and the flange portion 34, or may be formed from a separate component such as an adhesive layer.

When the lidded container 30 is used in a microwave oven, when the pressure inside the lidded container 30 increases due to steam generated by cooking the food contained in the container body 32, the lidded container 30 It is preferable to include an automatic steaming mechanism (a third embodiment of the automatic steaming mechanism) that automatically releases the steam inside the container 30 to the outside and prevents the lidded container 30 from bursting.
For example, the flange portion 34 has a protrusion 34a that protrudes toward the center of the container body 32, and the joining line 35 also has a protrusion formed in a convex shape toward the center of the container along this protrusion 34a. It has a line 35a. By forming the joining line 35 in such a form, as the pressure inside the lidded container 30 increases due to heating, the joining line 35 is likely to peel off from the protruding line 35a, and the container body 32 accommodating part 31 and the outside can be communicated with each other, and the steam inside the lidded container 30 can be released to the outside.
Note that in the lidded container 30 shown in FIGS. 7 and 8, the protrusions 34a are formed on the opposing long sides of the flange portion 34, but two protrusions 34a are not necessarily formed. It's okay.
In the case of the third embodiment of the automatic steaming mechanism, the sealant layer of the lid is preferably a film made of a mixed resin of polypropylene and polyethylene.

In addition, as the lid body 33 constituting the lidded container 30, the packaging material shown in FIG. 9 (a packaging material having a heat-softening resin layer in a part of the vicinity of the edge between the plastic film and the sealant layer) By using this, steam can be released when heated in a microwave oven for the same reason as explained in the second embodiment A of the automatic steaming mechanism described above.
In addition, by using a packaging material that has a heat-generating printed layer between the plastic film and the sealant layer and partially near the edge as the lid that constitutes the container with a lid, the above-mentioned automatic steaming mechanism can be realized. For the same reason as explained in the second embodiment B, steam can be released when heated in a microwave oven.

Examples of materials for the container body constituting the lidded container are shown in X1 to X5. For frozen foods, X2 or X4 is preferred.
X1: PP+PE (PE in small amount (5 to 40 mass% PE, remainder PP))
X2: PE
X3: Paper (PP on the surface of the flange part)
X4: Paper (PE on the surface of the flange part)
X5:PP

Further, examples of materials for the innermost layer of the lid constituting the lidded container are shown in Y1 to Y3. Note that Y2 preferably has a PP layer closer to the outer layer than PP+PE. Moreover, it is preferable that Y3 has a PE layer on the outer 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 5-40% by mass, PP is the balance))
Y3: PP+PE (PE is the main component (PP is 5-40% by mass, PE is the balance))

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

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

It is preferable that the packaging material constituting the lid body has a laminated structure of any one of the above-mentioned (1) to (4).
In addition, 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 types of polyester film and polyamide film. preferable.
In addition, when the lid is used for a microwave oven or a retort container, the intermediate base material layer may include a single polyester film, a single polyamide film such as nylon, a composite film containing one or more types of polyester film and polyamide film, and , it is preferable to use paper.
Further, 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 peelability as the sealant layer. Such a film varies depending on the type of container, but if the container is made of propylene resin, which is a general-purpose resin, it is preferable to use a film made of a resin mixed with PP and one or more types selected from PE, polybutene, and polystyrene. . Note that the sealant layer may have a multilayer structure, and easy peelability may be imparted only to the side of the sealant layer that is joined to the container body (the innermost layer in the packaging material).

More specifically, the packaging material constituting the microwave oven lid preferably has one of the following laminated structures (C1) to (C10). Note that "/" means the boundary between each layer. Furthermore, in (C1) to (C10), PET is preferably a stretched film. Moreover, ONy means stretched nylon.
(C1) PET/Glitter printed layer/ONy/Sealant layer with easy peel properties (C2) PET/Gas barrier layer/Glitter print layer/ONy/Sealant layer with easy peel properties (C3) PET/Glitter Printing layer/Gas barrier layer/ONy/Sealant layer with easy peel properties (C4) PET/Glitter print layer/PET/Sealant layer with easy peel properties (C5) PET/Gas barrier layer/Glitter print layer/PET /Sealant layer with easy peel properties (C6) PET/Glitter printed layer/Gas barrier layer/PET/Sealant layer with easy peel properties (C7) ONy/Glitter printed layer/ONy/Easy peel properties Sealant layer (C8) ONy/Gas barrier layer/Glitter printed layer/ONy/Sealant layer with easy peel properties (C9) ONy/Glitter print layer/Gas barrier layer/ONy/Sealant layer with easy peel properties (C10 ) ONy/glitter printed layer/EVOH/sealant layer with easy peel properties (C11) ONy/EVOH/glitter print layer/sealant layer with easy peel properties The gas barrier layers of C2, 5 and 8 are inorganic oxidized A single layer of a vapor-deposited film of a substance, 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 placed on the PET or ONy side). is preferred. Further, the gas barrier layers of C3, 6 and 9 are a single layer of a vapor deposited film or a composite layer in which a gas barrier coating film is formed on a vapor deposited film (in the composite layer, the vapor deposited film is placed on the ONy or PET side). It is preferable to have

In addition, when adopting the structure of the second embodiment A or B of the automatic vaporization mechanism described above for the lid body, the above-mentioned heat-softening resin layer or heat-generating printing is applied to a part between the plastic film and the sealant layer. All you have to do is form a layer.

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

1. Production of packaging material [Example 1]
After corona discharge treatment was performed on one surface of a 12 μm thick plastic film (PET film, Ra of both surfaces is 0.05 μm or less), a 10 nm thick silicon oxide vapor deposition film was formed. Furthermore, 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 using a gravure roll coater to form a gas barrier coating film with a dry thickness of 300 nm. did.
Next, the following Ink 1 for Glitter Printed Layer was gravure printed on the entire surface of the gas barrier layer and dried to form a Glitter Printed Layer with a dry thickness of 1.5 μm.
Next, a white pigment ink was gravure printed on the entire surface of the glitter print layer and dried to form a white solid print layer with a dry thickness of 1.5 μm.
Next, a coating solution for forming an adhesive layer containing a polyol and an isocyanate compound was applied onto the intermediate base layer (stretched Ny, thickness 15 μm) and dried to form a polyurethane adhesive layer with 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 solution for forming an adhesive layer containing a polyol and an isocyanate compound is applied onto the sealant layer (CPP, a single layer film of ethylene-propylene block copolymer, thickness 70 μm), and dried to form a polyurethane-based film with a thickness of 3 μm. An adhesive layer was formed. Next, a sealant layer with an adhesive layer formed thereon was dry-laminated on the surface of the intermediate base material to obtain the packaging material of Example 1.
The packaging material of Example 1 consisted of, from the outer layer side, a plastic film, a vapor deposited film, a gas barrier coating film, a printing layer (a bright printing layer, a white solid printing layer), an adhesive layer, an intermediate base material layer, an adhesive layer, and It has a sealant layer.

<Ink 1 for glitter printing layer>
・Composition containing metal scales and mineral spirit: 9 parts by mass (the content of metal scales is 85% by mass)
(Metal scales: non-leafing type aluminum scales, aspect ratio 20, average thickness 0.20μm)
・Organic yellow pigment: 3 parts by mass (average particle diameter: 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, n-propyl acetate, ethyl acetate, and isopropanol)
・Solvent 2: 6 parts by mass (mineral spirit)

[Example 2]
The packaging material of Example 2 was prepared in the same manner as in Example 1, except that the metal scales of Ink 1 for glitter printing layer were changed to non-leafing type aluminum scales (aspect ratio 28, average thickness 0.15 μm). Obtained.

[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 metal scales and mineral spirit in Ink 1 for glitter printing layer was changed from 9 parts by mass to 16 parts by mass. Ta.

[Example 4]
After corona discharge treatment was performed on one surface of a 12 μm thick plastic film (PET film, Ra of both surfaces is 0.05 μm or less), a 10 nm thick silicon oxide vapor deposition film was formed. Furthermore, 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 using a gravure roll coater to form a gas barrier coating film with a dry 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 transmittance.
Next, glitter printing ink 2 (an ink with the same formulation as the above-mentioned glitter printing layer ink 1 except that the organic yellow pigment was removed) is applied to the entire surface of the light-transmitting pattern printing layer. was gravure printed and dried to form a glitter printed layer with a dry thickness of 1.5 μm.
Next, a white pigment ink was gravure printed on the entire surface of the glitter print layer and dried to form a white solid print layer with a dry thickness of 1.5 μm.
Next, a coating solution for forming an adhesive layer containing a polyol and an isocyanate compound was applied onto the intermediate base layer (stretched Ny, thickness 15 μm) and dried to form a polyurethane adhesive layer with 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 solution for forming an adhesive layer containing a polyol and an isocyanate compound is applied onto the sealant layer (CPP, a single layer film of ethylene-propylene block copolymer, thickness 70 μm), and dried to form a polyurethane-based film with a thickness of 3 μm. An adhesive layer was formed. Next, a sealant layer with an adhesive layer formed thereon was dry-laminated on the surface of the intermediate base material to obtain the packaging material of Example 4.
The packaging material of Example 4 included, from the outer layer side, a plastic film, a vapor deposited film, a gas barrier coating film, a printing layer (a picture printing layer with light transparency, a glitter printing layer, a white solid printing layer), an adhesive layer, 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 diameter: 150 nm)
・Binder resin: 20 parts by mass (polyurethane resin, melting point 140°C)
・Solvent 1 (mixed solvent of propylene glycol monomethyl ether, n-propyl acetate, ethyl acetate, and isopropanol): 70 parts by mass

[Comparative example 1]
The packaging material of Comparative Example 1 was prepared in the same manner as in Example 1, except that the metal scales of Ink 1 for glitter printing layer were changed to non-leafing type aluminum scales (aspect ratio 45, average thickness 0.07 μm). Obtained.

[Comparative example 2]
A packaging material of Comparative Example 2 was obtained in the same manner as in Example 1, except that Ink 1 for glitter print layer was changed to Ink 2 for glitter print layer below.

<Ink for glitter printing layer 2>
・White pearl pigment (average length 15 μm, average thickness 0.2 μm): 10 parts by mass ・Colored pearl pigment (colored pearl pigment whose mica coating layer 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 acetic acid) Mixed solvent of propyl, ethyl acetate, and isopropanol): 60 parts by mass

[Comparative example 3]
The packaging material of Comparative Example 3 was prepared in the same manner as in Example 1, except that the metal scales of Ink 1 for glitter printing layer were changed to non-leafing type aluminum scales (aspect ratio 50, average thickness 0.10 μm). Obtained.

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 was attached to the CPP side surface of the packaging materials of Examples 1 to 4 and Comparative Examples 1 to 3 through a transparent adhesive layer, and the packaging materials of Examples 1 to 4 and Comparative Examples 1 to 3 were transparent. A sample was prepared in which an adhesive layer and a black plate were laminated in this order. The sample used was one in which the difference in refractive index between CPP, transparent adhesive, and black plate was within 0.05. The refractive index difference between the CPP and the transparent adhesive layer and the refractive index difference between the transparent adhesive layer and the black plate were both within 0.05.
Next, L ^* SCE was measured from the plastic film side of the sample using a spectrophotometer (manufactured by Konica Minolta, trade name "CM-700d"). Measurements were made at 20 locations for each sample, and the average value was taken as the L ^* SCE of the packaging materials of Examples 1 to 4 and Comparative Examples 1 to 3. Note that the light source was D65 and the viewing angle was 10 degrees.

2-2. 60 degree specular gloss The 60 degree specular gloss of the sample prepared in 2-1 was measured from the plastic film side in accordance with JIS Z8741:1997. Using a gloss meter (Tetsutani Co., Ltd., product name: micro-gloss 60° The ratio (G60/L ^* SCE) with L ^* SCE calculated in was calculated.

2-3. Aesthetic appearance due to metallic luster In a room equipped with a plurality of fluorescent lamps on the ceiling, the curtains were closed to block the incidence of external light, and the samples of Examples 1 to 4 and Comparative Examples 1 to 3 were examined under the illumination of the plurality of fluorescent lamps. The packaging material was observed from the plastic film side while being tilted in various directions, and the aesthetic appearance due to metallic luster was evaluated.
Metallic luster can be felt at many points within the surface of the packaging material even when observed from all directions, and 3 points were given as good aesthetics based on the metallic luster, and 2 points were given as unsatisfactory. There were many viewing directions in which metallic luster could not be felt at many points within the surface, and 20 subjects evaluated the results, with 1 point being given to those where the aesthetic appearance based on metallic luster was not sufficient, and the average score was calculated. . The results are shown in Table 1.
<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 have a metallic luster from all directions, and are extremely excellent in design. In addition, the packaging material of Example 4 does not contain a colorant in the glitter print layer, but contains a colorant in the light-transmitting pattern print layer located on the outer layer side of the glitter print layer. The in-plane color seemed more uniform than the packaging materials 1 to 3. 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 or holes were formed due to localized overheating. Ta.

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 6 Adhesive layer 7 Thermosoftening 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 steaming mechanism 21 First unsealed area 22 Opening 23 Second unsealed area 24 Notch 25 Heat seal part 25a Overhang part 30 Container with lid 31 Storage part 32 Container main body 33 Lid body 34 Flange part 35 Joining line

Claims (8)

At least, a plastic film, a glitter print layer, and a sealant layer are laminated in this order from the outer layer side, and the glitter print layer contains a glitter pigment and a binder resin, and satisfies the following conditions 1 and 2. Packaging materials that meet your needs.
<Condition 1>
Diffuse light reflection SCE is measured from the outer layer side of the packaging material, and when the L ^* value of the L ^* a ^* b ^* color system calculated from the spectrum of the diffuse light reflection SCE is defined as L ^* SCE, L ^* SCE is 65.0 or higher.
<Condition 2>
G60/L ^* SCE is 0.84 or more and less than 1.00, where G60 is the 60 degree specular gloss measured from the outer layer side of the packaging material according to JIS Z8741:1997. The packaging material according to claim 1, wherein G60/L ^* SCE is 0.84 or more and 0.90 or less. The packaging material according to claim 1 or 2, wherein the glitter pigment includes one or more selected from metal scales and pearl pigments. A packaging container at least partially 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, comprising a container body having a storage part and a lid joined to the container body so as to seal the storage part, the lid being made of the packaging material. 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 formed of the packaging material according to any one of claims 1 to 3.