Laminated film, packaging bag, packaging body, and method for manufacturing laminated film

Abstract

The laminated film of the present application is sequentially laminated with: a prescribed layer; an adhesive layer containing an adhesive component and polyvalent metal particles or polyvalent metal compound particles mixed in the adhesive component; and a sealant layer, the ratio of the maximum diameter of the agglomerates to the minimum diameter of the agglomerates formed from the polyvalent metal particles or the polyvalent metal compound particles being 14.0 or less.

Description

TECHNICAL FIELD

[0001] The present application relates to a laminated film, a packaging bag, a packaging body, and a method for manufacturing a laminated film.

[0002] This application claims priority based on Japanese Patent Application No. 2020-174465 filed on October 16, 2020, Japanese Patent Application No. 2020-213930 filed on December 23, 2020, Japanese Patent Application No. 2021-103474 filed on June 22, 2021, Japanese Patent Application No. 2021-103478 filed on June 22, 2021, and Japanese Patent Application No. 2021-103481 filed on June 22, 2021, the contents of which are incorporated herein. BACKGROUND

[0003] Packaging materials used in the packaging of a packaged product are required to have a function of suppressing deterioration in the quality of the packaged product. For example, a packaging bag constituted by adhering a pair of laminated films is known as a packaging material. Such a packaging bag is required to have excellent sealing properties in order to prevent deterioration in the quality of the packaged product.

[0004] As an example of a packaged product, food products can be given. When food products containing sulfur-containing amino acids such as meat products and egg products are subjected to boiling sterilization or retort sterilization, a peculiar off-flavor is sometimes generated. This off-flavor is caused by sulfur compounds such as hydrogen sulfide generated by the hydrolysis of sulfur-containing amino acids. In order to reduce such retort off-flavor, in Patent Literatures 1 and 2, a layer containing a polyvalent metal compound is provided in a packaging bag.

[0005] PRIOR ART DOCUMENTS

[0006] PATENT LITERATURE

[0007] Patent Literature 1: Japanese Patent Application Publication No. 2014-61682

[0008] Patent Literature 2: Japanese Patent Application Publication No. 2017-94533 SUMMARY

[0009] PROBLEMS TO BE SOLVED BY THE INVENTION

[0010] However, the above-described prior art has the following problems.

[0011] Packaged products of a packaging body are diverse, and the packaged product contains various components. A specific component among them sometimes reacts with a component constituting each layer of a laminated film forming a packaging bag, and affects the lamination strength. For example, the layer formed of a polyvalent metal compound of Patent Literature 1 can be affected by the contained components of the packaged product, and can affect the lamination strength between the layers of the laminated film.

[0012] The present application has been made in view of the above problems, and provides a laminated film, a packaging bag, and a packaging body, which can reduce high-temperature cooking odor and have good lamination strength.

[0013] Means for solving the technical problem

[0014] To achieve the above object, the present application employs the following means.

[0015] That is, the laminated film of the present application sequentially laminates a prescribed layer, an adhesive layer containing an adhesive component and polyvalent metal particles or polyvalent metal compound particles mixed in the adhesive component, and a sealant layer, the ratio of the maximum diameter of the above-mentioned agglomerates to the minimum diameter of the above-mentioned polyvalent metal particles or the above-mentioned polyvalent metal compound particles forming the agglomerates being 14.0 or less.

[0016] In addition, in the laminated film of the present application, the average agglomerate diameter of the above-mentioned agglomerates can be 150 nm or less.

[0017] In addition, in the laminated film of the present application, the above-mentioned agglomerates of 10 to 200% of the average particle diameter in the above-mentioned agglomerates can be 60 or more.

[0018] In addition, in the laminated film of the present application, the above-mentioned agglomerates having a diameter of 3.0 μm or more can be absent.

[0019] In addition, in the laminated film of the present application, with respect to the above-mentioned agglomerates having a diameter equivalent to the average agglomerate diameter, the agglomerate distance, which is the average value of the distance between adjacent above-mentioned agglomerates, can be 3.0 μm or less.

[0020] In addition, in the laminated film of the present application, the above-mentioned prescribed layer can be a base film having a barrier layer.

[0021] In addition, in the laminated film of the present application, the above-mentioned base film can have a nylon layer.

[0022] In addition, in the laminated film of the present application, the above-mentioned adhesive layer can contain 0.5% by mass or more and 10% by mass or less of the above-mentioned polyvalent metal particles or the above-mentioned polyvalent metal compound particles.

[0023] In addition, in the laminated film of the present application, the average particle diameter of the above-mentioned polyvalent metal particles or the above-mentioned polyvalent metal compound particles can be 10 nm or more and 45 nm or less.

[0024] In addition, in the laminated film of the present application, the specific surface area of the above-mentioned polyvalent metal particles or the above-mentioned polyvalent metal compound particles can be 1 m 2 / g or more.

[0025] Further, in the laminated film of the present application, the adhesive layer can further contain a dispersant for dispersing the multivalent metal particles or the multivalent metal compound particles in the adhesive component.

[0026] Further, in the laminated film of the present application, the adhesive component can be a cured product of a two-component curable adhesive.

[0027] Further, the packaging bag of the present application is a packaging bag formed by attaching a film, wherein the film contains the laminated film according to any one of the above.

[0028] Further, the packaging body of the present application is provided with the packaging bag described above and a packaged product housed in the packaging bag.

[0029] Further, in the packaging body of the present application, the packaged product can contain a sulfur compound.

[0030] Further, in the laminated film of the present application, in the adhesive layer, the number of the aggregates of 9 μm or more formed of the multivalent metal particles or the multivalent metal compound particles in a range of 500 μm x 500 μm is 30 or less.

[0031] Further, in the laminated film of the present application, the distance between the aggregates can be 100 μm or more.

[0032] Further, in the laminated film of the present application, the prescribed layer can be a base film having a barrier layer.

[0033] Further, in the laminated film of the present application, the base film can have a nylon layer.

[0034] Further, in the laminated film of the present application, the adhesive layer can contain 0.5 mass% or more and 10 mass% or less of the multivalent metal particles or the multivalent metal compound particles.

[0035] Further, in the laminated film of the present application, the average particle diameter of the multivalent metal particles or the multivalent metal compound particles can be 10 nm or more and 45 nm or less.

[0036] Further, in the laminated film of the present application, the specific surface area of the multivalent metal particles or the multivalent metal compound particles can be 1 m 2 / g or more.

[0037] Further, in the laminated film of the present application, the adhesive layer can further contain a dispersant for dispersing the multivalent metal particles or the multivalent metal compound particles in the adhesive component.

[0038] Further, in the laminated film of the present application, the adhesive component can be a cured product of a two-component curable adhesive.

[0039] Further, in the laminated film of the present application, a light-transmitting portion in which visible light transmits in the thickness direction can be provided, and the prescribed layer can be a base film having a barrier layer, and in the light-transmitting portion, the haze measured according to the haze measurement method prescribed in JIS-K-7136 can be 1.10 or less relative to the haze measured using the measurement method in the light-transmitting portion when the adhesive layer does not contain the multivalent metal particles and the multivalent metal compound particles.

[0040] Further, in the laminated film of the present application, the ratio of the solid content of the multivalent metal particles or the multivalent metal compound particles to the total mass of the solid content of the multivalent metal particles or the multivalent metal compound particles and the solid content of the adhesive in the adhesive layer can be 0.5 mass% or more and 10 mass% or less.

[0041] Further, in the laminated film of the present application, the average particle diameter of the multivalent metal particles or the multivalent metal compound particles can be 10 nm or more and 50 nm or less.

[0042] Further, in the laminated film of the present application, in the adhesive layer, the distribution of the aggregates formed by the multivalent metal particles or the multivalent metal compound particles can be such that the number of the aggregates having the average particle diameter of 10% or more and 200% or less of the average particle diameter present within a 50-μm square region in the width direction is 50 or more.

[0043] Further, in the laminated film of the present application, in the adhesive layer, the average diameter of the aggregates formed by the multivalent metal particles or the multivalent metal compound particles, as observed from the direction orthogonal to the thickness direction, can be 20 nm or more and 120 nm or less.

[0044] Further, in the laminated film of the present application, the specific surface area of the multivalent metal particles or the multivalent metal compound particles can be 1 m 2 / g or more.

[0045] Further, in the laminated film of the present application, the adhesive layer can further contain a dispersant that disperses the multivalent metal particles or the multivalent metal compound particles in the adhesive component.

[0046] Further, in the laminated film of the present application, the adhesive component can be a cured product of a two-component curable adhesive.

[0047] Further, in the laminated film of the present application, in the adhesive layer, the maximum diameter of the aggregates formed by the multivalent metal particles or the multivalent metal compound particles, as observed from the direction orthogonal to the thickness direction, can be 1.0 μm or less.

[0048] In addition, in the laminated film of the present application, the above-mentioned base film can have a nylon layer.

[0049] In addition, in the packaging body of the present application, the above-mentioned film can include the laminated film of any one of the above-mentioned embodiments.

[0050] In addition, in the packaging body of the present application, the above-mentioned packaging bag and the packaged article housed in the above-mentioned packaging bag can be provided.

[0051] In addition, in the packaging body of the present application, the above-mentioned packaged article can contain a sulfur compound.

[0052] In addition, the method for manufacturing a laminated film of the present application is a method for manufacturing a laminated film, the laminated film sequentially laminating: a base film having a barrier layer; an adhesive layer containing an adhesive component and polyvalent metal particles or polyvalent metal compound particles mixed in the above-mentioned adhesive component; and a sealant layer, the laminated film having a light-transmitting portion through which visible light is transmitted in the thickness direction, wherein, in the above-mentioned light-transmitting portion, the ratio of the haze measured according to the haze measurement method prescribed in JIS-K-7136 to the haze measured using the above-mentioned measurement method in the above-mentioned light-transmitting portion when the above-mentioned polyvalent metal particles and the above-mentioned polyvalent metal compound particles are not contained in the above-mentioned adhesive layer is 1.10 or less, and the process of forming the above-mentioned adhesive layer has a coating liquid preparation process of preparing a coating liquid obtained by mixing the above-mentioned polyvalent metal particles or the above-mentioned polyvalent metal compound particles in an adhesive that forms the above-mentioned adhesive component after curing, and in the above-mentioned coating liquid preparation process, dispersion treatment using a bead mill is performed in a state where the above-mentioned polyvalent metal particles or the above-mentioned polyvalent metal compound particles, a dispersant, and a solvent are mixed.

[0053] Effects of the Invention

[0054] The laminated film, the packaging bag, the packaging body, and the method for manufacturing a laminated film according to the present application are excellent in lamination strength while reducing high-temperature cooking off-flavor. BRIEF DESCRIPTION OF DRAWINGS

[0055] Figure 1 is a schematic cross-sectional view showing an example of a laminated film of the first embodiment of the present application.

[0056] Figure 2 is a schematic cross-sectional view showing an example of a laminated film of the second embodiment of the present application.

[0057] Figure 3 is a schematic cross-sectional view showing an example of a laminated film of the third embodiment of the present application.

[0058] Figure 4 is a schematic front view showing an example of a packaging bag and a packaging body of the fourth embodiment of the present application.

[0059] Figure 5A schematic perspective view for showing a manufacturing method of the packaging bag of the fourth embodiment of the present application.

[0060] Figure 6 A schematic perspective view for showing one example of the packaging bag and the packaging body of the fifth embodiment of the present application.

[0061] Figure 7 An example of an image of SEM image observation of Example 2.

[0062] Figure 8 An example of an image of SEM image observation of Comparative Example 5.

[0063] Figure 9 A schematic cross-sectional view for showing one example of the laminated film of the sixth embodiment of the present application.

[0064] Figure 10 A schematic cross-sectional view for showing one example of the laminated film of the seventh embodiment of the present application.

[0065] Figure 11 A schematic cross-sectional view for showing one example of the laminated film of the eighth embodiment of the present application.

[0066] Figure 12 A schematic front view for showing one example of the packaging bag and the packaging body of the ninth embodiment of the present application.

[0067] Figure 13 A schematic perspective view for showing a manufacturing method of the packaging bag of the ninth embodiment of the present application.

[0068] Figure 14 A schematic perspective view for showing one example of the packaging bag and the packaging body of the tenth embodiment of the present application.

[0069] Figure 15 An example of an image of OM image observation of Comparative Example 3.

[0070] Figure 16 A schematic cross-sectional view for showing one example of the laminated film of the eleventh embodiment of the present application.

[0071] Figure 17 A schematic cross-sectional view for showing one example of the laminated film of the twelfth embodiment of the present application.

[0072] Figure 18 A schematic front view for showing one example of the packaging bag and the packaging body of the thirteenth embodiment of the present application.

[0073] Figure 19 A schematic perspective view for showing a manufacturing method of the packaging bag of the thirteenth embodiment of the present application.

[0074] Figure 20A schematic perspective view showing one example of a packaging bag and a packaging body of the fourteenth embodiment of the present application.

[0075] Figure 21 Examples of photographic images of the laminated film of Example 2.

[0076] Figure 22 Examples of photographic images of the laminated film of Comparative Example 5. DETAILED DESCRIPTION

[0077] Embodiments of the present application will be described below with reference to the drawings. In all the drawings, the same or equivalent components are denoted by the same symbols even when the embodiments are different, and common descriptions are omitted. The positional relationship of up and down, left and right, and the like is based on the positional relationship shown in the drawings unless specifically limited.

[0078] Hereinafter, when a plurality of preferable numerical ranges are exemplified under a specific numerical range, the combination of the upper limit value and the lower limit value is not limited to the exemplified combination as long as it is included in the preferable maximum numerical range, unless specifically limited. For example, when "x1 or more and x4 or less" and "x2 or more and x3 or less" are exemplified as preferable ranges of a quantity X with x1 < x2 < x3 < x4, each numerical range such as "more than x1 and less than x4", "x2 or more and x4 or less", "x3 or more and x4 or less", and the like is also a preferable range.

[0079] [First Embodiment]

[0080] A laminated film of the first embodiment of the present application will be described.

[0081] Figure 1 A schematic cross-sectional view showing one example of a laminated film of the first embodiment of the present application.

[0082] Figure 1 The laminated film 50 of the present embodiment shown in the drawing has a substrate film (a prescribed layer) 10, an adhesive layer 20, and a sealant layer 30. The substrate film 10, the adhesive layer 20, and the sealant layer 30 in the laminated film 50 are sequentially laminated. The substrate film 10, the adhesive layer 20, and the sealant layer 30 each have a light-transmitting property of transmitting visible light. Therefore, the laminated film 50 has a light-transmitting portion through which visible light is transmitted in the thickness direction (the upward and downward direction in the drawing). Figure 1 In the example shown in the drawing, the light-transmitting portion is the entire laminated film 50. In addition, the laminated film 50 can also not have a light-transmitting portion.

[0083] The haze of the light-transmitting portion of the laminated film 50 is 30% or less as measured by the haze measurement method prescribed by JIS-K-7136. Hereinafter, the haze prescribed by JIS-K-7136 will be simply referred to as "haze".

[0084] The base material film 10 has a resin layer 12 and a barrier layer 14. In addition, the base material film 10 can also not have the barrier layer 14.

[0085] The resin layer 12 is composed of, for example, a resin film.

[0086] As the resin film, for example, a polyester film formed of polyethylene terephthalate (PET), polyethylene naphthalate (PEN), or the like; a polyolefin film formed of polyethylene, polypropylene, or the like; a polystyrene film; a polyamide film formed of polyamide such as 66-nylon; a polycarbonate film; an acrylonitrile film; a polyimide film; and an engineering plastic film formed of an engineering plastic, or the like can be given.

[0087] The resin film constituting the resin layer 12 can use one of the above alone, and can also use two or more in combination.

[0088] For example, the resin layer 12 can be composed by laminating a plurality of the same resin film.

[0089] The resin film can be either a stretched film or an unstretched film. The resin film can also be a multilayer film in which at least one stretched film and at least one unstretched film are laminated.

[0090] The resin layer 12 can also have a film that is arbitrarily stretched in a biaxial direction. At this time, the mechanical strength and the dimensional stability can be improved.

[0091] The resin layer 12, particularly from the viewpoint of balancing strength and softness, is more preferably composed of one or both of a polyester film and a biaxially stretched polypropylene film.

[0092] The resin layer 12, particularly from the viewpoint of improving strength and reducing cost, is more preferably composed of one or both of a polypropylene film and a polyethylene terephthalate film.

[0093] The resin layer 12, particularly from the viewpoint of improving strength, is more preferably composed of a nylon film. The nylon film is excellent in softness, and thus it is difficult to generate a pinhole. Therefore, when a packaging bag using the laminated film 50 is used to form a packaging body, it is possible to suppress generation of a pinhole in the laminated film 50 and deterioration of the packaged product. This effect is particularly useful when the packaged product is a food product.

[0094] The thickness of the resin layer 12 can be a thickness corresponding to the use or the desired characteristics, and is not particularly limited. The thickness of the resin layer 12 can be, for example, 3 μm or more and 100 μm or less, and is more preferably 6 μm or more and 50 μm or less.

[0095] The resin layer 12 can also contain an appropriate additive. As the additive, at least one selected from a filler, an antistatic agent, a plasticizer, a lubricant, and an antioxidant, or the like can be given.

[0096] The surface 12a of the resin layer 12 is a surface that forms an outer surface of the laminated film 50 when the packaging bag is formed.

[0097] The surface 12b of the resin layer 12 is a surface on the side opposite to the surface 12a in the thickness direction, and is a bonding surface with the barrier layer 14 described later.

[0098] The laminated film 50 can also be subjected to an appropriate surface treatment. For example, the surface 12b can be subjected to an appropriate surface treatment that improves the adhesion of the barrier layer 14. As examples of the surface treatment, at least one treatment selected from chemical reagent treatment, solvent treatment, corona treatment, plasma treatment, and ozone treatment can be cited.

[0099] The barrier layer 14 is a layer having barrier properties against at least oxygen and water vapor. The barrier layer 14 is laminated on the surface 12b of the resin layer 12.

[0100] The number of layers of the barrier layer 14 is not particularly limited as long as it contains at least one layer having barrier properties.

[0101] For example, as an example in which the barrier layer 14 is formed by a single layer, an evaporation layer formed of an inorganic substance, a barrier film formed of a resin having barrier properties, or the like can be cited.

[0102] For example, as an example in which the barrier layer 14 is composed of multiple layers, a barrier film formed by applying an inorganic substance having barrier properties on the surface of a resin film or the like can be cited.

[0103] As the inorganic substance that can be used in the barrier layer 14, silicon dioxide, aluminum, silicon, or the like can be cited. Such an inorganic substance can be evaporated on the surface of the resin layer 12 when the barrier layer 14 is formed by a single layer.

[0104] As the barrier film that can be used in the barrier layer 14, a nylon-based barrier film, an ethylene-vinyl alcohol-based barrier film, or the like can be cited. Such a barrier film can be laminated on the resin layer 12 by extrusion lamination, dry lamination, wet lamination, or the like when the barrier layer 14 is formed by a single layer.

[0105] For example, when the barrier layer 14 uses a barrier film on which an inorganic substance is applied, as the inorganic substance, silicon dioxide, aluminum, silicon, or the like can be used. At this time, the barrier film can be laminated on the resin layer 12 by dry lamination or the like.

[0106] The barrier layer 14 can use one of the above examples alone, or two or more of them in combination.

[0107] The layer thickness of the barrier layer 14 is not particularly limited. For example, when the barrier layer 14 is formed by an evaporation layer, the layer thickness can be 5 nm or more and 100 nm or less.

[0108] The barrier layer 14 can be formed, for example, by a vacuum evaporation method, a sputtering method, an ion plating method, a plasma vapor deposition method (CVD), a dry lamination method, an extrusion lamination method, or the like.

[0109] The adhesive layer 20 is a layer that adheres the barrier layer 14 to a sealant layer 30 described later.

[0110] The adhesive layer 20 contains an adhesive component and polyvalent metal particles or polyvalent metal compound particles mixed in the adhesive component.

[0111] As the adhesive component, for example, a cured product of a urethane-based adhesive, a polyester-based adhesive, a polyamide-based adhesive, an epoxy-based adhesive, an isocyanate-based adhesive, or the like can be given.

[0112] The adhesive component in the adhesive layer 20 is more preferably formed of a two-component curable adhesive from the viewpoint of easily suppressing deterioration of the polyvalent metal particles or polyvalent metal compound particles described later.

[0113] Such a deterioration suppression effect has a tendency to be more pronounced when a two-component curable urethane-based adhesive is used. Therefore, in the two-component curable adhesive, it is particularly preferable to use a urethane-based adhesive.

[0114] The polyvalent metal particles are particles formed of a metal that generates a polyvalent ion (hereinafter referred to as a polyvalent metal). The polyvalent metal compound particles are particles formed of a compound of a polyvalent metal.

[0115] The polyvalent metal particles or polyvalent metal compound particles are used for the purpose of capturing a substance that causes a high-temperature cooking odor (hereinafter sometimes referred to as an odor origin substance), such as a sulfur compound, and the like, in the adhesive layer 20. As the sulfur compound that is the odor origin substance, hydrogen sulfide, mercaptans, sulfur dioxide, sulfur trioxide, and the like can be given.

[0116] The principle by which the odor origin substance can be captured by the polyvalent metal particles and polyvalent metal compound particles is not clear in theory, but it can be determined by experiments that it is effective for reducing the odor origin substance.

[0117] The polyvalent metal particles and polyvalent metal compound particles mixed in the adhesive layer 20 have a capturing action of a compound that causes a high-temperature cooking odor, and are not particularly limited as long as they can stably exist inside the adhesive component of the adhesive layer 20.

[0118] As the polyvalent metal particles, for example, particles of alkaline earth metals such as beryllium, magnesium, calcium; particles of transition metals such as titanium, zirconium, chromium, manganese, iron, cobalt, nickel, copper, zinc; and particles of aluminum, or the like can be used.

[0119] The multivalent metal particles can have an oxide film formed on the surface thereof or can be surface-coated in order to easily and stably exist inside the adhesive layer 20.

[0120] As the multivalent metal compound particles, for example, particles of oxides, hydroxides, carbonates, organic acid salts (e.g., acetates), inorganic acid salts, and the like of multivalent metals can be given. As the multivalent metal compound particles, for example, particles of ammonium complexes of multivalent metal oxides, secondary amine to quaternary ammonium complexes of multivalent metal oxides, or carbonates or organic acid salts thereof can also be used.

[0121] From the viewpoint of easily and more stably existing inside the adhesive layer 20, it is more preferable to use the multivalent metal compound particles.

[0122] As the multivalent metal compound particles, from the viewpoints of stability in the adhesive component and ease of production, particles of zinc compounds, aluminum compounds, magnesium compounds, and the like are more preferable. From the viewpoints of ease of handling and cost, as the multivalent metal compound particles, particles of zinc oxide, aluminum oxide, magnesium oxide, and the like are particularly preferable.

[0123] Hereinafter, for simplicity, the multivalent metal particles or the multivalent metal compound particles mixed in the adhesive component will sometimes be referred to as "additive particles".

[0124] In the adhesive layer 20, one or two or more kinds of additive particles mixed in the adhesive component can be used.

[0125] The content of the additive particles in the adhesive layer 20 is not particularly limited.

[0126] The more the content of the additive particles, the more the amount of the odor origin substance captured increases, and thus the high-temperature cooking odor is more easily suppressed. On the other hand, when the content of the additive particles increases, there is a possibility that the laminate strength of the adhesive layer 20 easily decreases or the transparency of the laminate film 50 decreases.

[0127] For example, from the viewpoint of easily balancing the laminate strength of the adhesive layer 20 and the transparency of the laminate film and the reducing effect of the high-temperature cooking odor, the content of the additive particles in the adhesive layer 20 is more preferably 0.5% by mass or more and 10% by mass or less, and further preferably 1.5% by mass or more and 5% by mass or less.

[0128] When the content of the additive particles is less than 1% by mass, there is a possibility that the suppressing effect of the high-temperature cooking odor becomes too low.

[0129] When the content of the additive particles exceeds 10% by mass, there is a possibility that the laminate strength of the adhesive layer 20 becomes too low or the transparency of the laminate film becomes too low.

[0130] The distribution of the additive particles in the adhesive layer 20 is more preferably less biased. For example, when the distribution of the additive particles is concentrated in a particular portion due to aggregation or the like, the transparency in the laminated film 50 tends to become uneven. The distribution of the additive particles in the adhesive layer 20 can also be a cause of reducing the haze or reducing the lamination strength.

[0131] In particular, in the adhesive layer 20, when a large aggregate of the additive particles is formed, a granular unevenness is easily formed and becomes conspicuous. In particular, when the granular unevenness is arranged adjacent to each other, a striped unevenness is easily formed and becomes more conspicuous. For example, when the laminated film 50 is used in a packaging bag, and the contents of the packaging bag are visible from the outside through a light-transmissive portion, it is preferable that the granular unevenness or the striped unevenness is not visible.

[0132] For example, from the viewpoint of improving the lamination strength of the adhesive layer 20, the ratio of the maximum diameter of the aggregate to the minimum diameter of the aggregate is preferably 14.0 times or less. In addition, the average aggregate diameter of the aggregate is preferably 150 nm or less.

[0133] The diameter of the aggregate is measured by cutting the laminated film 50 with a microtome and observing the cross section with an SEM. The measurement method is to continuously take 5 pictures at a magnification of 10 μm along the adhesive layer 20. The maximum length of the aggregate diameter (major axis) included in the 5 taken pictures is taken as the "maximum diameter of the aggregate". The minimum length of the aggregate diameter included in the 5 taken pictures is taken as the "minimum diameter of the aggregate". The value obtained by dividing the "maximum diameter of the aggregate" by the "minimum diameter of the aggregate" becomes the "ratio of the maximum diameter of the aggregate to the minimum diameter of the aggregate". The "average aggregate diameter of the aggregate" is obtained by adding all the aggregate diameters (major axes) included in the 5 taken pictures and dividing by the number of aggregates.

[0134] Here, the "aggregate" is used in a broad sense and refers to an "appearance of a lump" when observed in the thickness direction using a microscope or the like. The "appearance of a lump" is formed due to the aggregation phenomenon of the additive particles, or is visible as a lump due to a high distribution density when observed in the thickness direction from a certain region, and is not particularly distinguished.

[0135] For example, it is considered that the additive particles capture the odor source substance by adsorbing and permeating the odor source substance into the adhesive layer 20.

[0136] In order for the additive particles to efficiently capture the odor source substance, the larger the specific surface area of the additive particles is, the more preferable it is. Here, the specific surface area indicates the surface area per unit mass of the additive particles. For example, the specific surface area of the additive particles can be 1 m 2 / g or more, and more preferably 5 m 2 / g or more.

[0137] When the specific surface area is increased, the particle diameter of the additive particles becomes too small, for example, and becomes liable to scatter into the environment, so attention is required at the time of handling. From the viewpoint of making the handling of the additive particles easy in the manufacturing process, the specific surface area of the additive particles can be 100 m 2 / g or less, and more preferably 50 m 2 / g.

[0138] When the average particle diameter of the primary particles that are the additive particles is too large, since aggregates exceeding 3.0 μm are liable to be formed, the average particle diameter of the additive particles is more preferably small. However, when the average particle diameter is small to some extent in the additive particles, the maximum diameter of the aggregates varies depending on the mixing method in the manufacturing process, and the correlation of the size of the average particle diameter with the maximum diameter of the aggregates weakens.

[0139] Hereinafter, the average particle diameter of the primary particles that are the additive particles is simply expressed as the average particle diameter of the additive particles unless otherwise specified. The average particle diameter is the area equivalent circle diameter obtained from an image in which the powder is enlarged 500,000 to 2,000,000 times using a transmission electron microscope (TEM), and is calculated from the following general formula. It is expressed by the formula: average particle diameter = sum of area equivalent circle diameters of measured particles / number of measured particles (the number of measured particles is at least 100 or more).

[0140] The average particle diameter of the additive particles is not particularly limited, and can be, for example, 5 nm or more and 100 nm or less, more preferably 10 nm or more and 60 nm or less, and further preferably 20 nm or more and 45 nm or less.

[0141] For example, when the average particle diameter of the additive particles is less than 5 nm, there is a possibility that the manufacturing cost is increased or the handling in the manufacturing process becomes difficult.

[0142] For example, when the average particle diameter of the additive particles exceeds 100 nm, since the specific surface area is reduced, there is a possibility that the capturing effect of the odor origin substance is reduced.

[0143] In order to reduce the size of the aggregates of the additive particles in the binder component, a dispersant of 1 part by mass or more and 50 parts by mass or less with respect to 100 parts by mass of the additive particles can also be contained in the adhesive layer 20.

[0144] The kind of the dispersant is not particularly limited as long as the additive particles can be dispersed in the liquid binder component used for forming the binder component.

[0145] For example, as the dispersing agent, (poly)ester salts, polyether phosphates, alkyl sulfate salts, alkylbenzenesulfonic acid salts, alkylnaphthalenesulfonic acid salts, alkylsulfosuccinic acid salts, alkyl diphenyl ether disulfonic acid salts, alkyl phosphates, aromatic phosphates, polyoxyethylene alkyl ethers, polyoxyethylene alkylphenol ethers, polyoxyethylene alkyl esters, alkylallyl sulfate salts, polyoxyethylene alkyl phosphates, sorbitan alkyl esters, glycerin fatty acid esters, sorbitan fatty acid esters, sucrose fatty acid esters, polyethylene glycol fatty acid esters, polyoxyethylene sorbitan alkyl esters, polyoxyethylene alkylallyl ethers, polyoxyethylene derivatives, polyoxyethylene sorbitol fatty acid esters, polyoxy fatty acid esters, polyoxyethylene alkylamines, vinyl chloride-vinyl acetate copolymers, and the like can be given. These dispersing agents can be used alone, and two or more kinds thereof can be used in combination.

[0146] The laminating strength of the adhesive layer 20 is measured according to JIS Z 0238:1998 using a tensile testing machine by T-peel method (crosshead speed: 300 mm / min).

[0147] The laminating strength of the adhesive layer 20 is, for example, preferably 6 N / 15 mm width or more, and more preferably 7 N / 15 mm width or more.

[0148] The thickness of the adhesive layer 20 is not particularly limited as long as the laminating strength is good when the laminate film 50 is formed into a packaging bag and the reduction effect of the odor-causing substance is good.

[0149] The thickness of the adhesive layer 20 is, for example, preferably 0.01 μm or more and 5 μm or less, and more preferably 0.03 μm or more and 3 μm or less.

[0150] When the thickness of the adhesive layer 20 is less than 0.01 μm, there is a possibility that the laminating strength is reduced and the amount of captured odor-causing substance is too small.

[0151] When the thickness of the adhesive layer 20 exceeds 5 μm, there is a possibility that the laminate film 50 becomes too thick.

[0152] The sealant layer 30 is a layer for adhering the laminate film 50 to another laminate film by heat fusion. The sealant layer 30 is not particularly limited as long as it can be fused by heat and fused and adhered to the sealant layer of another laminate film.

[0153] As the material of the sealant layer 30, for example, resins such as low-density polyethylene, medium-density polyethylene, high-density polyethylene, linear (thread-like) low-density polyethylene, polypropylene, ethylene-vinyl acetate copolymer, ionomer resin, ethylene-acrylic acid copolymer, ethylene-methyl acrylate copolymer, ethylene-methacrylic acid copolymer, and ethylene-propylene copolymer can be given. The resin used in the sealant layer 30 can use any one of the resins exemplified alone, and two or more kinds thereof can be used in combination.

[0154] For example, when a packaging body subjected to boiling sterilization or retort sterilization is formed by the lamination of the film 50, from the viewpoint of maintaining sufficient adhesion, a polypropylene resin that does not stretch is more preferably contained as the sealant layer 30.

[0155] The sealant layer 30 can be formed by extruding a resin composition onto the adhesive layer 20 while laminating the resin composition, or a sheet of the film after film formation can be attached to the adhesive layer 20.

[0156] The thickness of the sealant layer 30 can be, for example, 10 μm or more and 150 μm or less, and is more preferably 30 μm or more and 80 μm or less.

[0157] Next, an example of a method for manufacturing the laminated film 50 will be described.

[0158] First, a base film 10 in which the barrier layer 14 is laminated on a resin film that forms the resin layer 12 is prepared.

[0159] Subsequently, the adhesive layer 20 and the sealant layer 30 are sequentially laminated on the barrier layer 14 of the base film 10.

[0160] As the lamination method, for example, dry lamination can be used.

[0161] For example, a coating liquid in which the additive particles are mixed in an adhesive that forms the adhesive layer 20 after curing is prepared, the coating liquid is coated on the surface of the barrier layer 14 of the base film 10 and dried by a dry lamination machine, and the resin film that forms the sealant layer 30 and the base film 10 are heat-bonded using a hot roller.

[0162] The coating method of the coating liquid is not particularly limited. For example, the coating liquid can be coated using a coating machine such as a roll coater, a reverse roll coater, a gravure coater, a microgravure coater, a blade coater, a bar coater, a wire bar coater, a die coater, a dip coater, or a spin coater.

[0163] Furthermore, as the lamination method, a solventless laminator can be used, and a coating liquid in which the additive particles are mixed in the adhesive component of the adhesive layer 20 can also be used.

[0164] When the coating liquid is prepared, it is preferable to mix the additive particles in the adhesive that forms the adhesive component, and to sufficiently stir the additive particles so that the size of the aggregates of the additive particles is 3.0 μm or less. By stirring, the additive particles are dispersed in the coating liquid.

[0165] To reduce the size of the aggregate of the additive particles, it is more preferable to add a dispersant to the coating liquid. The dispersant can be directly added to the adhesive together with the additive particles, but it is more preferable to prepare the coating liquid by mixing and stirring the particle dispersion liquid in which the additive particles and the dispersant are dispersed in the solvent and the adhesive after the formation of the particle dispersion liquid. At this time, the dispersion of the additive particles in the coating liquid can be facilitated.

[0166] The additive particles are more preferably subjected to a physical defibrillation treatment in a state in which the additive particles, the dispersant, and the solvent are mixed. Thereby, the defibrillation and dispersion of the additive particles in the coating liquid can be facilitated.

[0167] As the physical defibrillation treatment, a high-pressure homogenizer, an ultrahigh-pressure homogenizer, a ball mill, a roll mill, a chopper, a planetary mill, a jet mill, a mortar, a grinder, a juicer mixer, a homogenizer, an ultrasonic homogenizer, a micro jet high-pressure homogenizer, underwater opposed jets, and the like can be given.

[0168] By using one or more of the above-described means, the dispersion treatment of the defibrillated additive particles in the coating liquid is performed, and the growth of the aggregate in the coating liquid can be suppressed.

[0169] By performing the dispersion treatment, the generation of the precipitate in the coating liquid can also be suppressed, and thus the additive particles can be efficiently dispersed in the coating liquid.

[0170] After the coating liquid is prepared, it is more preferable to perform a filtration treatment before coating.

[0171] The laminated film 50 can suppress the permeation of oxygen and water vapor, which have permeated the resin layer 12, through the adhesive layer 20 and the sealant layer 30, because it has the barrier layer 14 having a barrier property against oxygen and water vapor. Thus, the permeation of oxygen and water vapor and the like into the packaging bag can be suppressed. Therefore, in a packaging body in which the packaging bag formed of the laminated film 50 contains a packaged product, the deterioration of the packaged product due to at least one of oxygen and water vapor can be suppressed. The deterioration of the polyvalent metal particle or the polyvalent metal compound particle due to at least one of the permeated oxygen and water vapor from the outside can also be similarly suppressed.

[0172] The laminated film 50 can adsorb the odor source substance such as a sulfur compound, which has permeated the sealant layer 30 and penetrated into the adhesive layer 20, because it has the adhesive layer 20 containing the polyvalent metal particle or the polyvalent metal compound particle between the base film 10 and the sealant layer 30. Thus, in a packaging body in which the packaging bag formed of the laminated film 50 contains a packaged product, the odor source substance such as a sulfur compound originating from the packaged product penetrates into the adhesive layer 20, and is captured by the polyvalent metal particle or the polyvalent metal compound particle. As a result, the high-temperature cooking odor in the packaged product can be reduced.

[0173] By containing the multivalent metal particles or the multivalent metal compound particles, the decrease in the lamination strength of the adhesive layer 20 can be suppressed. Since the multivalent metal particles or the multivalent metal compound particles are mixed in the adhesive component of the adhesive layer 20, the deterioration of the multivalent metal particles or the multivalent metal compound particles due to the reaction with the components such as acetic acid or amino acid contained in the packaged article can also be suppressed. Thus, the reduction effect of the off-flavor origin substance and the difficulty in the decrease in the lamination strength over time can be achieved.

[0174] As explained above, according to the laminated film 50 of the present embodiment, a laminated film which can reduce high-temperature cooking off-flavor and which has good lamination strength can be provided.

[0175] [Second Embodiment]

[0176] A laminated film of the second embodiment of the present application will be explained.

[0177] Figure 2 A schematic cross-sectional view showing an example of the laminated film of the second embodiment of the present application.

[0178] Figure 2 In the laminated film 60 of the present embodiment shown, a base material film (a prescribed layer) 10A is provided instead of the base material film 10 in the laminated film 50 of the first embodiment.

[0179] The base material film 10A has the adhesive layer 16 and the intermediate layer 18 in this order between the barrier layer 14 and the adhesive layer 20. The following explanation will focus on aspects different from the first embodiment.

[0180] The adhesive layer 16 is a layer which adheres the barrier layer 14 and the intermediate layer 18.

[0181] The adhesive layer 16 uses one or more of the materials exemplified as the adhesive component in the adhesive layer 20. The adhesive layer 16 can be formed of the same material as the adhesive layer 20 in the laminated film 60, or can be formed of a different material.

[0182] The adhesive layer 16 can not contain the additive particles, or can contain the additive particles.

[0183] When the adhesive layer 16 contains the additive particles, the laminated film 60 is an example in which the laminated film has a plurality of adhesive layers containing the additive particles.

[0184] When the adhesive layer 16 contains the additive particles, the kind, the content, the specific surface area, the layer thickness, and the average particle diameter of the additive particles in the adhesive layer 16 are not particularly limited.

[0185] For example, the kind, the content, the specific surface area, the layer thickness, and the average particle diameter of the additive particles in the adhesive layer 16 are more preferably the same kind and the preferable numerical range as exemplified for the adhesive layer 20 in the laminated film 50.

[0186] The kind, content, specific surface area, layer thickness, and average particle diameter of the adhesive layer 20 in the laminated film 60 are also the same.

[0187] When the additive particles are contained in the adhesive layer 16, the maximum diameter and distribution of the additive particle aggregates in the laminated film 60 are not particularly limited.

[0188] The maximum diameter of the additive particle aggregates in the laminated film 60 is more preferably in the preferable range of the adhesive layer 20, 16 in the laminated film 60, respectively, than the adhesive layer 20 in the laminated film 50.

[0189] The distribution of the additive particle aggregates in the laminated film 60 is more preferably in the preferable range of the adhesive layer 20, 16 in the laminated film 60, respectively, than the adhesive layer 20 in the laminated film 50.

[0190] The intermediate layer 18 is a resin layer disposed between the barrier layer 14 and the sealant layer 30. The intermediate layer 18 is adhered to the barrier layer 14 via the adhesive layer 16 and adhered to the sealant layer 30 via the adhesive layer 20.

[0191] The material of the intermediate layer 18 is not particularly limited.

[0192] The kind of the intermediate layer 18 can be appropriately selected depending on the use of the laminated film 60. If a resin film having at least one property selected from the group consisting of excellent oxygen barrier property, water vapor barrier property, mechanical strength, bending resistance, puncture resistance, impact resistance, abrasion resistance, cold resistance, heat resistance, chemical resistance, and light resistance is selected as the intermediate layer 18, the property is improved in the laminated film 60.

[0193] For example, as a preferable material of the intermediate layer 18, a film of nylon, polyethylene terephthalate, polyamide, polyethylene, polypropylene, polyvinyl chloride, polycarbonate, polyvinyl alcohol, ethylene-propylene copolymer, ethylene-vinyl acetate copolymer saponate, or the like, or a resin film having a vapor-deposited layer can be mentioned.

[0194] For example, by using nylon as the intermediate layer 18, the softness is improved, and the occurrence of pinholes can be suppressed even when a large external force is applied. Thus, when a packaging body is formed using a packaging bag using the laminated film 50, the occurrence of pinholes in the laminated film 60 can be suppressed, and deterioration of the packaged product can be suppressed. This effect is particularly useful when the packaged product is a food product.

[0195] The laminated film 60 of the present embodiment can be manufactured in the same manner as the laminated film 50, except that the substrate film 10 is replaced with a substrate film 10A on which the adhesive layer 16 and the intermediate layer 18 are laminated on the barrier layer 14.

[0196] The adhesive layer 16 can be manufactured in the same manner as the adhesive layer 20 of the first embodiment, particularly when the adhesive layer 16 contains additive particles.

[0197] The laminated film 60 according to the present embodiment has the same configuration as the laminated film 50 of the first embodiment, except that the adhesive layer 16 and the intermediate layer 18 are laminated between the barrier layer 14 and the adhesive layer 20, and thus can provide a laminated film that can reduce high-temperature cooking odor while having good lamination strength.

[0198] In particular, according to the laminated film 60, the properties of the laminated film 60 can be improved in correspondence with the properties of the intermediate layer 18 because the intermediate layer 18 is contained.

[0199] Further, when the multivalent metal particles or the multivalent metal compound particles are contained in the adhesive layer 16, the layers that capture odor origin substances exist in two layers, and thus the odor origin substance reduction effect can be improved.

[0200] [Third Embodiment]

[0201] A laminated film according to the third embodiment of the present application will be described.

[0202] Figure 3 A schematic cross-sectional view showing an example of the laminated film according to the third embodiment of the present application.

[0203] Figure 3 The laminated film 70 of the present embodiment shown is provided with a substrate film (a prescribed layer) 10B instead of the substrate film 10A in the laminated film 60 of the second embodiment. The laminated film 70 has the resin layer 12, the adhesive layer 16, the intermediate layer 18, the adhesive layer 16B, and the intermediate layer 18B laminated in this order. The following description will focus on aspects different from the second embodiment.

[0204] The adhesive layer 16 is a layer that adheres the resin layer 12 and the intermediate layer 18. The adhesive layer 16B is a layer that adheres the intermediate layer 18 and the intermediate layer 18B.

[0205] The adhesive layers 16, 16B use one or more of the materials exemplified as the adhesive component in the adhesive layer 20. The adhesive layers 16, 16B can be formed of the same material as the adhesive layer 20 in the laminated film 70, or can be formed of a different material.

[0206] The adhesive layers 16, 16B can contain no additive particles, or can contain additive particles.

[0207] When the adhesive layers 16, 16B contain additive particles, the laminated film 70 is an example in which the laminated film has a plurality of adhesive layers containing additive particles.

[0208] When the additive particles are contained in the adhesive layers 16, 16B, the kind, content, specific surface area, layer thickness, and average particle diameter of the additive particles in the adhesive layers 16, 16B are not particularly limited.

[0209] For example, the kind, content, specific surface area, layer thickness, and average particle diameter of the additive particles in the adhesive layers 16, 16B are more preferably the same kind and preferable range of values as exemplified for the adhesive layer 20 in the laminated film 50.

[0210] The kind, content, specific surface area, layer thickness, and average particle diameter of the adhesive layer 20 in the laminated film 70 are also the same.

[0211] When the additive particles are contained in the adhesive layers 16, 16B, the maximum diameter and distribution of the additive particle aggregates in the laminated film 70 are not particularly limited.

[0212] The maximum diameter of the additive particle aggregates in the laminated film 70 is more preferably the preferable range of values of the adhesive layers 16, 16B in the laminated film 70, respectively, as the adhesive layer 20 in the laminated film 50.

[0213] The distribution of the additive particle aggregates in the laminated film 70 is more preferably the preferable range of values of the adhesive layers 16, 16B in the laminated film 70, respectively, as the adhesive layer 20 in the laminated film 50.

[0214] The intermediate layer 18 is a resin layer disposed between the resin layer 12 and the intermediate layer 18B. The intermediate layer 18 is adhered to the resin layer 12 via the adhesive layer 16 and adhered to the intermediate layer 18B via the adhesive layer 16B.

[0215] The material of the intermediate layer 18 is not particularly limited.

[0216] The kind of the intermediate layer 18 can be appropriately selected depending on the use of the laminated film 70. If a resin film having at least one property selected from the group consisting of excellent oxygen barrier property, water vapor barrier property, mechanical strength, bending resistance, puncture resistance, impact resistance, abrasion resistance, cold resistance, heat resistance, chemical resistance, and light resistance is selected, the property is improved in the laminated film 70.

[0217] For example, as the preferable material of the intermediate layer 18, a film of nylon, polyethylene terephthalate, polyamide, polyethylene, polypropylene, polyvinyl chloride, polycarbonate, polyvinyl alcohol, ethylene-propylene copolymer, ethylene-vinyl acetate copolymer saponate, or the like, or a resin film having a vapor-deposited layer can be mentioned.

[0218] For example, by using nylon as the intermediate layer 18, the softness is improved, and even if a large external force is applied, the occurrence of pinholes can be suppressed. Therefore, when a package is formed using the packaging bag using the laminated film 70, the deterioration of the packaged product due to the occurrence of pinholes in the laminated film 70 can be suppressed. This effect is particularly useful when the packaged product is a food product.

[0219] The intermediate layer 18B is a layer disposed between the intermediate layer 18 and the sealant layer 30. The intermediate layer 18B is adhered to the intermediate layer 18 via the adhesive layer 16B and is adhered to the sealant layer 30 via the adhesive layer 20.

[0220] For example, an aluminum film sheet can be used as the intermediate layer 18, 18B. The aluminum film sheet has the property of being difficult to pass through gas or liquid, and blocking light. Therefore, when a package is formed using the packaging bag using the laminated film 70, the deterioration of the packaged product can be suppressed. In addition, since the odor does not escape, the flavor can be suppressed from running away and deteriorating. This effect is particularly useful when the packaged product is a food product.

[0221] According to the laminated film 70 of the present embodiment, a laminated film that can reduce high-temperature retort off-flavor while having good lamination strength can be provided.

[0222] [Fourth Embodiment]

[0223] A packaging bag and a package of the fourth embodiment of the present application will be described.

[0224] Figure 4 A schematic front view showing an example of a packaging bag and a package of the fourth embodiment of the present application.

[0225] As shown in Figure 4 The package 200 of the present embodiment has the packaging bag 100 of the present embodiment and a packaged product 110 housed inside the packaging bag 100.

[0226] The packaging bag 100 has a seal portion 101 in which the edges of a pair of laminated films 50 cut into a substantially rectangular shape are adhered, and a housing portion 102 formed between the pair of laminated films 50 surrounded by the seal portion 101. That is, the side end portion, the lower end portion, and the upper end portion of the packaging bag 100 are sealed by the seal portion 101.

[0227] The housing portion 102 is formed by sandwiching a pair of laminated films 50 to form a housing space surrounded by the seal portion 101, and a packaged product 110 such as a food product is housed therein.

[0228] For example, the package 200 can also be a retort food in which the packaged product 110 formed of a food product is heat sterilized and sealed with the packaging bag 100.

[0229] A pair of laminated films 50 are formed by cutting the laminated film 50 of the first embodiment to an appropriate size.

[0230] A pair of laminated films 50 are overlapped with their respective sealant layers 30 facing each other. Each sealant layer 30 is thermally fused together at the outer periphery of the pair of laminated films 50, thereby forming a sealing portion 101.

[0231] The packaging bag 100 has an opening portion 120. For example, the opening portion 120 has a pair of easy-open processing portions 124 formed in the sealing portion 101 at the side end and a semi-tangent line 121 forming a cleaving track between the pair of easy-open processing portions 124.

[0232] The easy-opening processing section 124 is not particularly limited as long as it allows the packaging bag 100 to be easily opened. For example, the easy-opening processing section 124 can be formed by a group of traces formed by a collection of micro-recesses formed on the surface of the sealing section 101. For example, the easy-opening processing section 124 can also be a cut that extends through the thickness direction at the end edge of the sealing section 101. The shape of the cut is not particularly limited, and can be, for example, a V-shaped, U-shaped, or I-shaped cut.

[0233] For example, the semi-tangent 121 can be formed by laser processing.

[0234] The manufacturing method of the packaging bag 100 and the packaging body 200 is described.

[0235] Figure 5 This is a schematic perspective view illustrating a method for manufacturing a packaging bag according to a fourth embodiment of the present invention.

[0236] Prepare a pair of laminated films 50 to be cut according to the shape of packaging bag 100.

[0237] After that, as Figure 5 As shown, the sealant layers 30 of each laminated film 50 are made to face each other, and the sealant layers 30 at the lower end and side end of each laminated film 50 are thermally melted and bonded together.

[0238] Thus, a sealing portion 101 is formed on the lower end and the side end. A receiving portion 102 is formed inside each of the U-shaped laminated films 50 surrounded by the sealing portion 101.

[0239] An opening is formed at the upper end of the packaging bag 100, which connects to the receiving part 102.

[0240] Next, the packaged item 110 is filled into the unsealed packaging bag 100 from the upper end. Then, the sealant layers 30 of the stacked films 50 facing each other are thermally fused together at the upper end, forming a sealing portion 101 at the upper end as well. In this way, a package can be manufactured. Figure 4 The package shown is 200.

[0241] In the packaging bag 100 of the present embodiment, the accommodation portion 102 is formed by the same laminate film 50 as in the first embodiment.

[0242] Each laminate film 50 has the barrier layer 14, and thus can suppress the penetration of oxygen and water vapor from the outside to the inside, and can suppress the deterioration of the members and the packaged product 110 on the inside of the barrier layer 14 due to oxygen and water vapor.

[0243] Each laminate film 50 contains the polyvalent metal particles or polyvalent metal compound particles in the adhesive layer 20 on the inside (the packaged product side) of the barrier layer 14. Thus, the high-temperature cooking odor origin substances such as sulfur compounds generated from the packaged product 110 can be adsorbed for a long period of time. Therefore, the packaging bag 100 can suppress the accumulation of the high-temperature cooking odor origin substances inside the packaged product 110 in the accommodation portion 102.

[0244] As a result, the high-temperature cooking odor generated when the packaging body 200 is opened can be reduced.

[0245] The packaged product 110 sometimes contains components (deterioration origin components) that deteriorate the capturing action of the high-temperature cooking odor due to the deterioration of the polyvalent metal particles or polyvalent metal compound particles depending on the kind thereof. For example, acids such as acetic acid contained in various foods easily deteriorate the polyvalent metal particles or polyvalent metal compound particles.

[0246] In the present embodiment, since the polyvalent metal particles or polyvalent metal compound particles are mixed in the adhesive component and are covered by the adhesive component, the chemical reaction of the polyvalent metal particles or polyvalent metal compound particles with the deterioration origin components is suppressed, for example, and thus the polyvalent metal particles or polyvalent metal compound particles are difficult to deteriorate.

[0247] As described above, according to the packaging bag 100 and the packaging body 200 of the present embodiment, since the laminate film 50 of the first embodiment is provided, the packaging bag and the packaging body that can reduce the high-temperature cooking odor and have a good lamination strength can be provided as in the first embodiment. Further, even if the laminate film 60 of the second embodiment or the laminate film 70 of the third embodiment is used instead of the laminate film 50, the same effects are obtained.

[0248] [Fifth Embodiment]

[0249] A packaging bag and a packaging body of the fifth embodiment of the present application will be described.

[0250] Figure 6 A schematic perspective view showing an example of a packaging bag and a packaging body of the fifth embodiment of the present application.

[0251] As Figure 6As shown, the package 210 of the present embodiment is provided with the packaging bag 150 and the packaged article 110 as in the fourth embodiment.

[0252] The packaging bag 150 is a self-standing bag provided with a pair of the laminated film 50 and a bottom tape adhered to the lower end portion of each laminated film 50. The bottom tape 152 is composed of a laminated film having the same layer configuration as the laminated film 50.

[0253] The packaging bag 150 and the package 210 of the present embodiment are formed in the shape of a self-standing bag by including the bottom tape 152, and are otherwise configured similarly to the packaging bag 100 and the package 200 of the fourth embodiment.

[0254] The package 210 can be manufactured by using a known self-standing bag manufacturing method using a pair of the laminated film 50 and the bottom tape 152, after the packaging bag 150 having the opening formed in the upper end portion is manufactured, the packaged article 110 is filled from the upper end portion, the upper end portion is sealed, and the seal portion 101 is formed.

[0255] The packaging bag 150 and the package 210 of the present embodiment are provided with the laminated film 50 as in the fourth embodiment, and thus have the same effects as the fourth embodiment. Further, even if the laminated film 60 of the second embodiment or the laminated film 70 of the third embodiment is used instead of the laminated film 50, the same effects are obtained.

[0256] Further, in each of the above embodiments, an example in which the entire laminated film 50, 60 is the light-transmitting portion is described.

[0257] However, by providing a printing layer at an appropriate portion of the laminated film 50, 60, a light-blocking portion can be formed on a portion of the laminated film 50, 60, and a light-transmitting portion can be formed on a portion of the laminated film 50, 60.

[0258] For example, when the packaging bag 100 is formed using a pair of the laminated film 50 as in the fourth embodiment, a light-blocking portion formed of a printing layer can be formed on one or both of the pair of the laminated film 50.

[0259] For example, in the laminated film 50, 60, the printing layer can be provided between the resin layer 12 and the barrier layer 14.

[0260] The printing layer is, for example, a layer composed of an ink in which various pigments, plasticizers, drying agents, stabilizers, and the like are added to an adhesive resin such as urethane-based, acrylic-based, nitrocellulose-based, or rubber-based. By the printing layer, characters, patterns, and the like can be displayed. As a printing method, for example, a known printing method such as offset printing, gravure printing, flexographic printing, screen printing, inkjet printing, and the like can be used.

[0261] The surface 12b of the resin layer 12 forming the print layer can also be subjected to a corona treatment or an ozone treatment as a pretreatment in advance. In this case, the adhesion of the print layer to the resin layer 12 can be improved.

[0262] The layers of the laminated film of the above-described first and second embodiments are examples. For example, the laminated film can also have any layer or film between the adhesive layer 20 and the sealant layer 30 or between the resin layer 12 and the barrier layer 14, within a range that does not significantly impair the function of the laminated film.

[0263] In the above-described explanation of the second embodiment, examples in which the adhesive layer 20 of the laminated film 60 contains the multivalent metal particles or multivalent metal compound particles and examples in which both the adhesive layers 20 and 16 of the laminated film 60 contain the multivalent metal particles or multivalent metal compound particles are explained. However, the multivalent metal particles or multivalent metal compound particles can be contained only in the adhesive layer 16.

[0264] In the above-described explanation of the second embodiment, an example in which the intermediate layer is one layer is explained. However, the laminated film can also include two or more intermediate layers.

[0265] The resin layer 12, the adhesive layer 16, the intermediate layer 18, the adhesive layer 16, the aluminum-containing barrier layer 14, the adhesive layer 20, and the sealant layer 30 can also be sequentially laminated.

[0266] The resin layer 12, the adhesive layer 16, the aluminum-containing barrier layer 14, the adhesive layer 20, and the sealant layer 30 can also be sequentially laminated.

[0267] The barrier layer 14, the adhesive layer 16, the intermediate layer 18, the adhesive layer 20, and the sealant layer 30 can also be sequentially laminated.

[0268] The resin layer 12, the adhesive layer 16, the intermediate layer 18, the adhesive layer 20, and the sealant layer 30 can also be sequentially laminated.

[0269] The intermediate layer 18, the adhesive layer 20, and the sealant layer 30 can also be sequentially laminated.

[0270] The resin layer 12, the adhesive layer 20, and the sealant layer 30 can also be sequentially laminated.

[0271] The intermediate layer 18, the barrier layer 14, the adhesive layer 20, and the sealant layer 30 can also be sequentially laminated.

[0272] The sealant layer 30 can also be configured in the same manner as the resin layer 12.

[0273] The laminated film can also be configured in a manner in which light-blocking properties are imparted by light-blocking printing.

[0274] The solid printing layer can also be provided on the resin layer 12 or the barrier layer 14. For example, when the resin layer 12, the adhesive layer 16, the intermediate layer 18, the adhesive layer 20, and the sealant layer 30 are sequentially stacked, the solid printing layer provided in the resin layer 12 is disposed between the resin layer 12 and the adhesive layer 16.

[0275] In addition, for example, when the resin layer 12, the barrier layer 14, the adhesive layer 16, the intermediate layer 18, the adhesive layer 20, and the sealant layer 30 are sequentially stacked, the solid printing layer provided in the barrier layer 14 is disposed between the barrier layer 14 and the adhesive layer 16.

[0276] In the above-described fourth embodiment, an example in which the packaging bag 100 and the packaging body 200 are formed using the pair of laminated films 50 is described.

[0277] However, as shown in FIG. 6, instead of the pair of laminated films 50, a pair of laminated films 60, 70 can be used to form the packaging bag 100A and the packaging body 200A. Figure 4 5 As shown in FIG. 6, the packaging bag 100A and the packaging body 200A can be manufactured in the same manner as the packaging bag 100 and the packaging body 200 except that the pair of laminated films 60 is used instead of the pair of laminated films 50.

[0278] The packaging bag 100A and the packaging body 200A have the same effects as the laminated film 60 because the pair of laminated films 60 is provided.

[0279] In the above-described fourth embodiment, an example in which the packaging bag 150 and the packaging body 210 are formed using the pair of laminated films 50 is described.

[0280] However, as shown in FIG. 7, instead of the pair of laminated films 50, a pair of laminated films 60, 70 can be used to form the packaging bag 150A and the packaging body 210A.

[0281] As shown in FIG. 7, the packaging bag 150A and the packaging body 210A can be manufactured in the same manner as the packaging bag 150 and the packaging body 210 except that the pair of laminated films 60 is used instead of the pair of laminated films 50. Figure 6 The packaging bag 150A and the packaging body 210A have the same effects as the laminated film 60 because the pair of laminated films 60 is provided.

[0282] In the above-described fourth and fifth embodiments, an example in which the packaging bag and the packaging body are formed using the pair of laminated films 50 is described. However, as long as the laminated film 50 is used in a part of the outer periphery of the packaging bag and the packaging body, the laminated film of the other outer periphery can have a different layer configuration from the laminated film 50.

[0283] In the above-described fourth and fifth embodiments, an example in which the packaging bag and the packaging body are formed using the pair of laminated films 50 is described. However, as long as the laminated film 50 is used in a part of the outer periphery of the packaging bag and the packaging body, the laminated film of the other outer periphery can have a different layer configuration from the laminated film 50.

[0284] In the above-described fourth and fifth embodiments, an example in which the packaging bag and the packaging body are formed using the pair of laminated films 50 is described. However, as long as the laminated film 50 is used in a part of the outer periphery of the packaging bag and the packaging body, the laminated film of the other outer periphery can have a different layer configuration from the laminated film 50.​

[0285] For example, when the multivalent metal particles or the multivalent metal compound particles contained in the one laminated film 50 can suppress the high-temperature cooking odor, the other laminated films can not contain the multivalent metal particles or the multivalent metal compound particles.

[0286] In the above fourth and fifth embodiments, the examples of the four-side seal bag and the stand-up pouch for the packaging bag are described, but the shape of the packaging bag is not limited to these, and other bag shapes known in the art can also be used.

[0287] For example, the shape of the packaging bag can also be a two-side seal bag, a three-side seal bag, or a clamshell bag.

[0288] For example, the packaging bag can also have a synthetic resin zipper that can be repeatedly sealed by fitting a container spigot or a belt-shaped protruding portion into a belt-shaped recessed portion.

[0289] The packaging bag can also have any one or more of the functions of a high-temperature cooking packaging material, a boiling packaging material, a microwave oven packaging material, and the like.

[0290] In the above fourth and fifth embodiments, the example in which the packaged article 110 is a food product is described, but the packaged article 110 is not limited to a food product.

[0291] The packaged article 110 can also be curry, chow mein, noodle sauce, liquid seasoning, pasta sauce, side dish, soup, stock for a one-pot dish, and pet food.

[0292] [Embodiments]

[0293] Hereinafter, Examples 1 to 31 of the embodiments of the present application will be described together with Comparative Examples 1 to 20. Examples 1 to 22 and Comparative Examples 1 to 14 constitute the configuration of the second embodiment of the present application.

[0294] Examples 23 to 31 and Comparative Examples 15 to 20 constitute the configuration of the third embodiment of the present application.

[0295] First, the particle dispersion liquids used in the production of the laminated films of Examples 1 to 31 and Comparative Examples 1 to 20 will be described. Each of the particle dispersion liquids is used to produce an adhesive containing multivalent metal compound particles.

[0296] The composition and dispersion treatment of the particle dispersion liquids used in the production of the laminated films of Examples 1 to 31 and Comparative Examples 1 to 20 are shown in the following [Table 1].

[0297] [Table 1]

[0298]

[0299] [Particle Dispersion Liquid 11Aa]

[0300] As shown in [Table 1], the particle dispersion liquid 11Aa was produced by dispersing microparticles of zinc oxide (ZnO) as a multivalent metal oxide (hereinafter referred to as zinc oxide particles) in ethyl acetate.

[0301] The particle dispersion liquid 11Aa was produced as follows.

[0302] First, zinc oxide particles were added to ethyl acetate as a solvent to form a mixed liquid. As the zinc oxide particles, FINEX-30 (trade name; manufactured by Sakai Chemical Industry Co., Ltd.) having an average particle diameter of 35 nm was used. The amount of FINEX (registered trademark)-30 added was an amount in which the solid content concentration of the mixed liquid reached 30 mass%.

[0303] Subsequently, a dispersant A containing a polyester amide amine salt, an alkylcyclohexane, and propylene glycol monomethyl ether acetate was added to the mixed liquid. The dispersant A was a dispersant in which an amide amine acid of a high-molecular-weight polyester acid was a main component.

[0304] The amount of the dispersant A added was 5 mass parts based on 100 mass parts of the solid content of the zinc oxide particles in the mixed liquid.

[0305] The mixed liquid was subjected to a dispersion treatment using a planetary ball mill ([Table 1] is described as “bead mill”).

[0306] Thus, the particle dispersion liquid 11Aa in which the zinc oxide particles were dispersed in the solvent was produced.

[0307] [Particle dispersion liquid 11Ba]

[0308] The particle dispersion liquid 11Ba was produced in the same manner as the particle dispersion liquid 11Aa except that the amount of the dispersant added was 40 mass parts.

[0309] [Particle dispersion liquid 11Ca]

[0310] The particle dispersion liquid 11Ca was produced in the same manner as the particle dispersion liquid 11Aa except that the amount of the dispersant added was 20 mass parts.

[0311] [Particle dispersion liquids 12Aa, 12Ba]

[0312] The particle dispersion liquid 12Aa was produced in the same manner as the particle dispersion liquid 11Aa except that a dispersant B containing a phosphate ester was used instead of the dispersant A as a dispersant. The dispersant B was a polyether phosphate compound-based dispersant.

[0313] The particle dispersion liquid 12Ba was produced in the same manner as the particle dispersion liquid 12Aa except that the amount of the dispersant added was 40 mass parts.

[0314] [Particle dispersion liquids 13Aa, 13Ba]

[0315] Particle dispersion liquid 13Aa was prepared in the same manner as particle dispersion liquid 11Aa except that a dispersant C containing a vinyl chloride-vinyl acetate copolymer, acetone and methanol was used as a dispersant instead of dispersant A.

[0316] Particle dispersion liquid 13Ba was prepared in the same manner as particle dispersion liquid 13Aa except that the amount of the dispersant added was 40 parts by mass.

[0317] [Particle dispersion liquids 14Aa, 14Ba, 14Ca]

[0318] Particle dispersion liquid 14Aa was prepared in the same manner as particle dispersion liquid 11Aa except that zinc oxide particles FINEX (registered trademark) -50 (trade name; manufactured by Sakai Chemical Industry Co., Ltd.) having an average particle diameter of 20 nm in primary particles were used instead of FINEX-30 (registered trademark) having an average particle diameter of 35 nm in primary particles.

[0319] Particle dispersion liquid 14Ba was prepared in the same manner as particle dispersion liquid 14Aa except that the amount of the dispersant added was 40 parts by mass.

[0320] Particle dispersion liquid 14Ca was prepared in the same manner as particle dispersion liquid 14Aa except that the amount of the dispersant added was 20 parts by mass.

[0321] [Particle dispersion liquids 15Aa, 15Ba]

[0322] Particle dispersion liquid 15Aa was prepared in the same manner as particle dispersion liquid 11Aa except that zinc oxide particles FINEX (registered trademark) -20 having an average particle diameter of 60 nm in primary particles were used instead of FINEX (registered trademark) -30.

[0323] Particle dispersion liquid 15Ba was prepared in the same manner as particle dispersion liquid 15Aa except that the amount of the dispersant added was 40 parts by mass.

[0324] [Particle dispersion liquids 100a, 200a, 300a, 400a]

[0325] Particle dispersion liquid 100a was prepared in the same manner as particle dispersion liquid 11Aa except that no dispersant was added.

[0326] Particle dispersion liquid 200a was prepared in the same manner as particle dispersion liquid 100a except that aluminum oxide (AI2O3) particles (hereinafter referred to as aluminum oxide particles) manufactured by Fuji Photo Film Co., Ltd. and Mitsui & Co., Ltd. were used instead of zinc oxide particles. The average particle diameter of the aluminum oxide particles was 45 nm.

[0327] Particle dispersion liquid 300a was prepared in the same manner as particle dispersion liquid 100a except that magnesium oxide (MgO) particles (hereinafter referred to as magnesium oxide particles) manufactured by Stream Chemicals Co., Ltd. were used instead of zinc oxide particles.

[0328] Particle dispersion liquid 400a was prepared in the same manner as particle dispersion liquid 100a except that FINEX (registered trademark) -50 was used instead of FINEX (registered trademark) -30.

[0329] [Particle dispersion liquids 11Ab, 11Bb, 11Cb]

[0330] Particle dispersion liquid 11Ab was prepared in the same manner as particle dispersion liquid 11Aa except that the dispersion treatment using a planetary ball mill was not performed and the mixed solution was stirred using a stirring blade for 10 minutes (described as "stirring only" in [Table 1]).

[0331] Particle dispersion liquid 11Bb was prepared in the same manner as particle dispersion liquid 11Ab except that the amount of the dispersant added was 40 parts by mass.

[0332] Particle dispersion liquid 11Cb was prepared in the same manner as particle dispersion liquid 11Ab except that the amount of the dispersant added was 20 parts by mass.

[0333] [Particle dispersion liquids 14Ab, 14Bb]

[0334] Particle dispersion liquid 14Ab was prepared in the same manner as particle dispersion liquid 14Aa except that the dispersion treatment using a planetary ball mill was not performed and the mixed solution was stirred using a stirring blade for 10 minutes.

[0335] Particle dispersion liquid 14Bb was prepared in the same manner as particle dispersion liquid 14Ab except that the amount of the dispersant added was 40 parts by mass.

[0336] [Particle dispersion liquids 100b, 200b, 300b, 400b]

[0337] Particle dispersion liquid 100b was prepared in the same manner as particle dispersion liquid 100a except that the dispersion treatment using a planetary ball mill was not performed and the mixed solution was stirred using a stirring blade for 10 minutes.

[0338] Particle dispersion liquid 200b was prepared in the same manner as particle dispersion liquid 200a except that the dispersion treatment using a planetary ball mill was not performed and the mixed solution was stirred using a stirring blade for 10 minutes.

[0339] The particle dispersion liquid 300b was prepared in the same manner as the particle dispersion liquid 300a except that the dispersion treatment using the planetary ball mill was not performed and the mixed liquid was stirred using the stirring blade for 10 minutes.

[0340] The particle dispersion liquid 400b was prepared in the same manner as the particle dispersion liquid 400a except that the dispersion treatment using the planetary ball mill was not performed and the mixed liquid was stirred using the stirring blade for 10 minutes.

[0341] The manufacturing conditions and evaluation results of Examples 1 to 31 and Comparative Examples 1 to 20 are shown in the following [Table 2].

[0342] [Table 2]

[0343]

[0344] [Example 1]

[0345] In Example 1, as the resin layer 12, Toyobo Ester (registered trademark) Film E5100 (trade name; manufactured by Toyobo Co., Ltd.) which is a biaxially-stretched polyethylene terephthalate film was used. The thickness of E5100 was 12 μm, the length was 500 m, and the width was 600 mm.

[0346] The one surface 12b of the resin layer 12 was subjected to corona treatment, and a barrier layer 14 formed of SiOx was formed on the surface 12b subjected to the corona treatment using a vacuum evaporation machine.

[0347] Specifically, an evaporation material in which metal silicon powder and silica powder were mixed was prepared, and the surface 12b was subjected to evaporation in such a manner that an evaporation layer in which the element ratio of O / Si was 1.5 (x = 1.5) was formed using the vacuum evaporation machine. The thickness of the barrier layer 14 was 50 nm.

[0348] Subsequently, Emblem (registered trademark) ON (trade name; manufactured by Unitika Co., Ltd.) which is a nylon film having a thickness of 15 μm was laminated using a dry laminator as a nylon film on the barrier layer 14, and a two-component curable polyurethane-based adhesive A626 / A50 (trade name; manufactured by Mitsui Chemicals, Inc.) was applied. Thus, the adhesive layer 16 and the intermediate layer 18 were formed.

[0349] A coating liquid for forming the adhesive layer 20 was prepared using the particle dispersion liquid 11Aa as follows.

[0350] The above-mentioned A626 and A50 as the two-component curable polyurethane-based adhesive were mixed in a mass ratio of 8:1, diluted with ethyl acetate, and formed into an adhesive having a solid content concentration of 30 mass%. Thereafter, the particle dispersion liquid 11Aa was added to the adhesive, and adjusted so that the ratio of the solid content of the zinc oxide particles to the total mass of the solid content of the adhesive and the solid content of the zinc oxide particles was 1.5 mass%.

[0351] Hereinafter, the "ratio of the solid content of the polyvalent metal compound particles to the total mass of the solid content of the adhesive and the solid content of the polyvalent metal compound particles" will be referred to as the "amount of particles in the coating liquid" for simplicity. This is described as "amount of particles" in [Table 2].

[0352] Thereafter, the mixture of the adhesive and the particle dispersion liquid 11Aa was stirred with a stirring wing for 30 minutes. Thereafter, the mixture was filtered with a filter membrane having a pore diameter of 3 μm, thereby obtaining the coating liquid 11Aa used in Example 1. In the particle dispersion liquid 11Aa subjected to the dispersion treatment, the zinc oxide particles were difficult to aggregate, and thus most of the zinc oxide particles in the mixture passed through the filter membrane.

[0353] Thereafter, the coating liquid 11Aa was applied to the intermediate layer 18 using a dry laminator, and a polyolefin-based non-stretching co-extruded film having a thickness of 80 μm was attached as the sealant layer 30.

[0354] Thus, a laminated film 60 having a laminated structure as shown in Figure 2 was obtained. That is, the laminated film 60 had, in order, the sealant layer 30 formed of a polyolefin-based non-stretching co-extruded film, the adhesive layer 20 containing zinc oxide particles, the intermediate layer 18 formed of a nylon film, the adhesive layer 16 not containing zinc oxide particles, the barrier layer 14, and the resin layer 12.

[0355] The amount of particles of the zinc oxide particles in the adhesive layer 20 was also 1.5 mass% as the amount of particles in the coating liquid.

[0356] Thereafter, the laminated film 60 of Example 1 was attached so that the sealant layers 30 faced each other, and a packaging bag 100A of Example 1 of a three-side sealed bag as shown in Figure 5 was produced.

[0357] Thereafter, the contents 110 were housed in the packaging bag 100A and sealed, and a packaging body 200A of Example 1 was produced.

[0358] As the contents 110, a cysteine aqueous solution containing 0.03 mass% of cysteine was used.

[0359] [Examples 2 to 22]

[0360] As shown in [Table 2], the laminated film 60, the packaging bag 100A, and the packaging body 200A were produced in the same manner as in Example 1 except that each of the coating liquids described in the columns was used instead of the coating liquid 11Aa.

[0361] The particle amount of the zinc oxide particles in the coating liquid 11Aa was 1.5 mass%, while the particle amount of the zinc oxide particles in the coating liquid 11Aa+ was 9.5 mass%, the particle amount of the zinc oxide particles in the coating liquid 11Aa- was 0.8 mass%, and the particle amount of the zinc oxide particles in the coating liquid 11Aa++ was 11 mass%.

[0362] The particle amount of the zinc oxide particles in the coating liquid 11Ca was 3.0 mass%, while the particle amount of the zinc oxide particles in the coating liquid 11Ca+ was 5.0 mass%.

[0363] The particle amount of the zinc oxide particles in the coating liquid 14Ca was 3.0 mass%, while the particle amount of the zinc oxide particles in the coating liquid 14Ca+ was 5.0 mass%.

[0364] The particle amount of the zinc oxide particles in the coating liquid 100a was 1.5 mass%, while the particle amount of the zinc oxide particles in the coating liquid 100a+ was 9.5 mass%.

[0365] [Example 23]

[0366] In Example 23, as the resin layer 12, Toyobo Ester (registered trademark) Film E5100 (trade name; manufactured by Toyobo Co., Ltd.) was used, which is a biaxially-stretched polyethylene terephthalate film. The thickness of E5100 was 12 μm, the length was 500 m, and the width was 600 mm.

[0367] On the resin layer 12, a two-component curable polyurethane-based adhesive A525 / A52 (trade name; manufactured by Mitsui Chemicals, Inc.) was coated using a dry laminator, and a nylon film Emblem (registered trademark) ON (trade name; manufactured by Unitika Ltd.) having a thickness of 15 μm was laminated as the intermediate layer 18. Thus, the adhesive layer 16 and the intermediate layer 18 were formed.

[0368] Next, on the intermediate layer 18, the adhesive was again coated, and an aluminum film sheet having a thickness of 7 μm was laminated as the intermediate layer 18B. Thus, the adhesive layer 16B and the intermediate layer 18B were formed.

[0369] Using the particle dispersion liquid 11Aa, a coating liquid for forming the adhesive layer 20 was prepared as follows.

[0370] The above-mentioned A525 and A52 as the two-component curable polyurethane-based adhesive were mixed in a mass ratio of 8:1, diluted with ethyl acetate, and formed into an adhesive having a solid content concentration of 30 mass%. Thereafter, the particle dispersion liquid 11Aa was added to the adhesive, and adjusted so that the ratio of the solid content of the zinc oxide particles to the total mass of the solid content of the adhesive and the solid content of the zinc oxide particles was 1.5 mass%.

[0371] Hereinafter, the "ratio of the solid content of the polyvalent metal compound particles to the total mass of the solid content of the adhesive and the solid content of the polyvalent metal compound particles" will be referred to as the "amount of particles in the coating liquid" for simplicity. This is described as "amount of particles" in [Table 2].

[0372] Thereafter, the mixture of the adhesive and the particle dispersion liquid 11Aa was stirred with a stirring blade for 30 minutes. Thereafter, the mixture was filtered with a filter membrane having a pore diameter of 3 μm, thereby obtaining the coating liquid 11Aa used in Example 19. In the particle dispersion liquid 11Aa subjected to the dispersion treatment, the zinc oxide particles were difficult to aggregate, and thus most of the zinc oxide particles in the mixture passed through the filter membrane.

[0373] Thereafter, the coating liquid 11Aa was applied to the intermediate layer 18B using a dry laminator, and a polyolefin-based non-stretching co-extruded film having a thickness of 80 μm was attached as the sealant layer 30.

[0374] Thus, a laminate 70 having the layered structure shown in Figure 3 was obtained. That is, the laminate 70 had, in order, the sealant layer 30 formed of a polyolefin-based non-stretching co-extruded film, the adhesive layer 20 containing zinc oxide particles, the intermediate layer 18B formed of an aluminum foil, the adhesive layer 16B not containing zinc oxide particles, the intermediate layer 18 formed of a nylon film, the adhesive layer 16 not containing zinc oxide particles, and the resin layer 12.

[0375] The amount of particles of the zinc oxide particles in the adhesive layer 20 was also 1.5 mass% as the amount of particles in the coating liquid.

[0376] Thereafter, the laminate 70 of Example 1 was attached so that the sealant layers 30 faced each other, and a three-side sealed bag of the packaging bag 100A of Example 1 shown in Figure 5 was produced.

[0377] Thereafter, the packaged article 110 was housed in the packaging bag 100A and sealed, and a packaging body 200A of Example 1 was produced.

[0378] As the packaged article 110, a cysteine aqueous solution containing 0.03 mass% of cysteine was used.

[0379] [Examples 24 to 31]

[0380] The laminated film 70, the packaging bag 100A, and the packaging body 200A of Comparative Examples 3 to 14 were produced in the same manner as in Comparative Example 2, except that the coating liquid described in each column was used.

[0381] [Comparative Examples 1 to 14]

[0382] The laminated film 60, the packaging bag 100A, and the packaging body 200A of Comparative Example 1 were produced in the same manner as in Example 1, except that the polyurethane-based adhesive was used alone to form the adhesive layer, and the multivalent metal particles and the multivalent metal compound particles were not used.

[0383] The laminated film 60, the packaging bag 100A, and the packaging body 200A of Comparative Example 2 were produced in the same manner as in Example 9, except that the coating liquid 100bN (the particle amount of the zinc oxide particles was 1.5 mass%) was used instead of the coating liquid 100a. The coating liquid 100bN was formed in the same manner as the coating liquid 100a, except that the adhesive and the particle dispersion liquid 100b were stirred for 30 minutes, and then filtration was not performed using a filter membrane.

[0384] The laminated film 60, the packaging bag 100A, and the packaging body 200A of Comparative Examples 3 to 14 were produced in the same manner as in Comparative Example 2, except that the coating liquid described in each column was used.

[0385] The particle amount of the zinc oxide particles in the coating liquid 100bN was 1.5 mass%, the particle amount of the zinc oxide particles in the coating liquid 100bP was 3.0 mass%, and the particle amount of the zinc oxide particles in the coating liquid 100b+ was 9.5 mass%.

[0386] The particle amount of the aluminum oxide particles in the coating liquid 200b was 1.5 mass%, and the particle amount of the aluminum oxide particles in the coating liquid 200b+ was 9.5 mass%.

[0387] The particle amount of the magnesium oxide particles in the coating liquid 300b was 1.5 mass%, and the particle amount of the magnesium oxide particles in the coating liquid 300b+ was 9.5 mass%.

[0388] [Comparative Examples 15 to 20]

[0389] The laminated film 70, the packaging bag 100A, and the packaging body 200A of Comparative Example 15 were produced in the same manner as in Example 23, except that the coating liquid 11Ab (the particle amount of the zinc oxide particles was 1.5 mass%) was used instead of the coating liquid 11Aa. The coating liquid 11Ab was formed in the same manner as the coating liquid 11Aa, except that the adhesive and the particle dispersion liquid 11Ab were stirred for 30 minutes, and then filtration was not performed using a filter membrane.

[0390] Comparative Examples 16 to 20 were produced in the same manner as in Example 23, except that each of the coating liquids described in the respective columns was used.

[0391] [Method of Evaluation]

[0392] In order to evaluate each of the examples and comparative examples, SEM image observation was performed, and hydrogen sulfide (H2S) concentration and lamination strength were measured.

[0393] The SEM image observation results were obtained by cutting the laminated film with a microtome and observing the cross section with an SEM. Five 10-μm images were continuously taken at a magnification of 10,000 along the adhesive layer 20. The maximum length (maximum diameter of the aggregate) of the aggregate diameter (length) included in the five taken images was recorded in the "Maximum Aggregate Diameter" column of [Table 2]. The minimum length (minimum diameter of the aggregate) of the aggregate diameter included in the five taken images was recorded in the "Minimum Aggregate Diameter" column of [Table 2]. The value obtained by dividing the "Maximum Aggregate Diameter" by the "Minimum Aggregate Diameter" (the ratio of the maximum diameter of the aggregate to the minimum diameter of the aggregate) was recorded in the "Ratio" column of [Table 2]. The value obtained by adding up all the aggregate diameters (lengths) included in the five taken images and dividing by the number of aggregates (the average aggregate diameter of the aggregates) was recorded in the "Average Aggregate Diameter" column of [Table 2]. The number of aggregates having a size of 10 to 200% of the average particle diameter of the aggregates included in the five taken images was recorded in the "Aggregate Number 1" column of [Table 2]. The number of aggregates having a diameter (length) of 3 μm or more included in the five taken images was recorded in the "Aggregate Number 2" column of [Table 2]. The average distance between adjacent aggregates of the aggregates having a diameter (length) of 10 to 200% of the average aggregate diameter included in the five taken images was recorded in the "Distance Between Aggregates" column of [Table 2].

[0394] In the hydrogen sulfide concentration measurement, the package containing the cysteine aqueous solution in each of the examples and comparative examples was used as a test sample.

[0395] Each of the test sample packages was subjected to high-temperature cooking treatment at 120°C for 60 minutes. After the high-temperature cooking treatment, the package was stored in a refrigerator for one week. The aqueous solution in each of the packages after the storage was collected, and the hydrogen sulfide concentration was obtained using the methylene blue method (wavelength: 668 nm). In the calculation of the hydrogen sulfide concentration, a standard curve prepared in advance was used. The measurement results of the hydrogen sulfide concentration are shown in [Table 2].

[0396] As a sample to be tested for the determination of the laminate strength, the packaging bag corresponding to the packaging bag before the high-temperature retort treatment and the packaging bag after the high-temperature retort treatment in each of the examples and comparative examples were used.

[0397] The packaging bag corresponding to the packaging bag before the high-temperature retort treatment was aged at 45°C for 4 days. Thereafter, the laminate strength between the nylon layer and the sealant layer was determined in accordance with JIS Z0238:1998. Specifically, the universal tensile material tester (trade name; manufactured by A&D Company, Ltd.) was used to determine the laminate strength of each sample to be tested by the T-type peeling method (crosshead speed: 300 mm / min). The determination results are shown in the column of "laminate strength before treatment" in [Table 2].

[0398] The sample to be tested using the packaging bag after the high-temperature retort treatment was determined for the laminate strength (N / 15 mm width) in the same manner as the packaging bag corresponding to the packaging bag before the high-temperature retort treatment. The determination results are shown in the column of "laminate strength after treatment" in [Table 2]. In [Table 2], (N / 15 mm width) is expressed as (N).

[0399] [Results of Evaluation]

[0400] As shown in [Table 2], in the laminate film of Examples 1 to 31, the "multiplicity" in the adhesive layer 20 was 2.86 to 13.33. In addition, the "average aggregate diameter" was 25 nm to 110 nm. In addition, the "aggregate number 1" was 60 to 5000, and the "aggregate number 2" was 0. In addition, the "inter-aggregate distance" was 0.3 to 2.7 μm.

[0401] In addition, in the laminate film of Examples 1 to 19 and 21 to 30, the laminate strength after the high-temperature retort treatment was 8 N / 15 mm width or more. Furthermore, in the laminate film of Examples 20 and 31, the laminate strength after the high-temperature retort treatment was 6 N / 15 mm width or more.

[0402] In Examples 1 to 31, the "multiplicity" was 2.86 to 13.33. In Comparative Examples 2 to 20, the "multiplicity" was 77.78 to 180.00. In Comparative Examples 2 to 20, both the results of the adsorption effect of the high-temperature retort odor and the laminate strength after the high-temperature retort treatment were poor, and thus it was found that the adsorption effect of the high-temperature retort odor was improved and the laminate strength after the high-temperature retort treatment was good when the "multiplicity" was 14.0 times or less. It is considered that this is because there were no coarse aggregates in Examples 1 to 31, and thus a large interface could not be formed, and the laminate strength was difficult to deteriorate.

[0403] In Examples 1 to 31, the "average aggregate diameter" was 25 nm to 110 nm. In Comparative Examples 2 to 20, the "average aggregate diameter" was 2000 nm (2.0 μm) to 3500 nm (3.5 μm). In Comparative Examples 2 to 20, both the results of the adsorption effect of the high-temperature cooking odor and the laminated strength after the high-temperature cooking treatment were poor. When the aggregate diameter is small, the surface area becomes wide and the adsorption effect improves, and thus it is known that the "average aggregate diameter" of 150 nm or less improves the adsorption effect of the high-temperature cooking odor and the laminated strength after the high-temperature cooking treatment is good.

[0404] In Examples 1 to 31, the "inter-aggregate distance" was 0.3 μm to 2.7 μm. In Comparative Examples 2 to 20, the "inter-aggregate distance" was 15 μm to 40 μm. In Comparative Examples 2 to 20, both the results of the adsorption effect of the high-temperature cooking odor and the laminated strength after the high-temperature cooking treatment were poor.

[0405] When the inter-aggregate distance is small, the number of aggregates is large. That is, since the size of the aggregates is reduced one by one, the surface area becomes wide, the adsorption effect improves, it is difficult to form a large interface, and the laminated strength is difficult to deteriorate, and thus it is known that the "inter-aggregate distance" of 3.0 μm or less improves the adsorption effect of the high-temperature cooking odor and the laminated strength after the high-temperature cooking treatment is good.

[0406] When Comparative Example 1 and Examples 19 and 20 are compared, the "aggregate number 1" in Example 20 in which the particle amount was 11 mass% was 500, the "aggregate number 1" in Example 1 in which the particle amount was 1.5 mass% was 80, and the "aggregate number 1" in Example 19 in which the particle amount was 0.8 mass% was 65. When Comparative Example 2 and Example 3 are compared, the "aggregate number 1" in Example 3 in which the particle amount was 5.0 mass% was 250, and the "aggregate number 1" in Example 2 in which the particle amount was 3.0 mass% was 150. When Comparative Example 9 and Example 11 are compared, the "aggregate number 1" in Example 11 in which the particle amount was 9.5 mass% was 200, and the "aggregate number 1" in Example 9 in which the particle amount was 1.5 mass% was 60. When Comparative Example 13 and Example 14 are compared, the "aggregate number 1" in Example 14 in which the particle amount was 5.0 mass% was 300, and the "aggregate number 1" in Example 13 in which the particle amount was 3.0 mass% was 200.

[0407] That is, it is known that the number of "aggregate number 1" increases when the particle amount of the additive particles is large.

[0408] In Examples 1 to 31, the "aggregate number 1" which is the number of aggregates having a size of 10 to 200% of the average particle diameter was 60 or more, while in Comparative Examples 1 to 20, the maximum was 0 to 10. Here, when the "aggregate number 1" is 60 or more, the dispersibility is improved, and the adsorption of high-temperature cooking odor is facilitated.

[0409] It is considered that the aggregates having a size of 10 to 200% of the average particle diameter are preferably 60 or more.

[0410] In Examples 1 to 31, the "aggregate number 2" which is the number of aggregates having a diameter (major axis) of 3 μm or more in the aggregates was 0, while in Comparative Examples 1 to 20, the minimum number of "aggregate number 2" was 0 to 2. Here, when there are no aggregates having a diameter (major axis) of 3 μm or more, the cohesion of the film of the adhesive layer is difficult to reduce.

[0411] It is considered that it is preferable that there are no aggregates having a diameter (major axis) of 3 μm or more.

[0412] When Comparative Example 1 and Examples 19 and 20 are compared, the hydrogen sulfide concentration in Example 20 in which the particle amount was 11 mass% was 0.0 mg / L, the hydrogen sulfide concentration in Example 1 in which the particle amount was 1.5 mass% was 0.03 mg / L, and the hydrogen sulfide concentration in Example 19 in which the particle amount was 0.8 mass% was 0.2 mg / L. When Comparative Example 2 and Example 3 are compared, the hydrogen sulfide concentration in Example 3 in which the particle amount was 5.0 mass% was 0.01 mg / L, and the hydrogen sulfide concentration in Example 2 in which the particle amount was 3.0 mass% was 0.02 mg / L. When Comparative Example 9 and Example 11 are compared, the hydrogen sulfide concentration in Example 11 in which the particle amount was 9.5 mass% was 0.01 mg / L, and the hydrogen sulfide concentration in Example 9 in which the particle amount was 1.5 mass% was 0.03 mg / L. When Comparative Example 13 and Example 14 are compared, the hydrogen sulfide concentration in Example 14 in which the particle amount was 5.0 mass% was 0.01 mg / L, and the hydrogen sulfide concentration in Example 13 in which the particle amount was 3.0 mass% was 0.02 mg / L.

[0413] That is, it is known that the adsorption effect of high-temperature cooking odor is high when the particle amount of the additive particles is large.

[0414] When the particle amount is 0.5 mass% or more, the adsorption effect of high-temperature cooking odor is sufficient, but it is considered that the particle amount is preferably 1.0 mass% or more.

[0415] When Comparative Example 1 and Example 20 are compared, the laminate strength after high-temperature cooking treatment in Example 1 in which the particle amount was 1.5 mass% was 8 N / 15 mm width, and the laminate strength after high-temperature cooking treatment in Example 20 in which the particle amount was 11 mass% was 6 N / 15 mm width.

[0416] That is, when the amount of the additive particles is large, the adsorption effect of the high-temperature cooking odor is high, but the aggregates of the additive particles are easily formed, and even when the dispersibility is high, the adhesion of the particles increases, and the cohesion of the film as a film decreases (the film becomes weak), and thus it is considered that the amount of the additive particles is preferably 10% by mass or less.

[0417] When comparing Comparative Example 12 and Example 21, the hydrogen sulfide concentration in Example 12 in which the average particle diameter of the primary particles of the additive particles is 20 nm is 0.03 mg / L, and the hydrogen sulfide concentration in Example 21 in which the average particle diameter of the primary particles of the additive particles is 60 nm is 0.06 mg / L. When comparing Comparative Example 15 and Example 22, the hydrogen sulfide concentration in Example 15 in which the average particle diameter of the primary particles of the additive particles is 20 nm is 0.03 mg / L, and the hydrogen sulfide concentration in Example 22 in which the average particle diameter of the primary particles of the additive particles is 60 nm is 0.06 mg / L.

[0418] That is, it is also possible that the average particle diameter of the primary particles of the additive particles is 60 nm, but since the surface area decreases as the average particle diameter increases, it is considered that the average particle diameter is preferably 45 nm or less.

[0419] Example 1 and Example 23, Example 4 and Example 24, Example 9 and Example 25, Example 10 and Example 26, Example 12 and Example 27, Example 15 and Example 28, Example 16 and Example 29, Example 19 and Example 30, and Example 20 and Example 31 differ in that the aluminum film sheet is not placed in the intermediate layer in the former, but is placed in the intermediate layer in the latter. Since the reactivity of aluminum is low, the results are the same in terms of the adsorption effect of the high-temperature cooking odor and the laminate strength after the high-temperature cooking treatment, regardless of the presence or absence of the aluminum film sheet.

[0420] Figure 7 An example of the image observed from the SEM image of Example 2. Figure 8 An example of the image observed from the SEM image of Comparative Example 5. Figure 7 P1 indicates an aggregate. Figure 8 P2 indicates an aggregate, the adhesive layer 20 is described as Adhesive 2, the intermediate layer 18 is described as NY, and the sealant layer 30 is described as PP.

[0421] [Comprehensive Evaluation]

[0422] As for the high-temperature cooking odor (described as "odor" in [Table 2]), it was determined to be good (described as "A" in [Table 2]) when the hydrogen sulfide concentration was 0.04 mg / L or less, to be slightly good (described as "B" in [Table 2]) when the hydrogen sulfide concentration was more than 0.04 mg / L and 0.25 mg / L or less, and to be poor (described as "C" in [Table 2]) when the hydrogen sulfide concentration was more than 0.25 mg / L.

[0423] As for the laminating strength (described as "strength" in [Table 2]), it was determined to be good (described as "A" in [Table 2]) when the laminating strength after the high-temperature cooking treatment was 7 N / 15 mm width or more, to be slightly good (described as "B" in [Table 2]) when the laminating strength after the high-temperature cooking treatment was 6 N / 15 mm width or more and less than 7 N / 15 mm width, and to be poor (described as "C" in [Table 2]) when the laminating strength after the high-temperature cooking treatment was less than 6 N / 15 mm width.

[0424] As for the comprehensive evaluation, it was determined to be good (described as "A" in [Table 2]) when both of the evaluations of the high-temperature cooking odor and the laminating strength were good (described as "A" in [Table 2]), to be slightly good (described as "B" in [Table 2]) when either of the evaluations of the high-temperature cooking odor and the laminating strength was good (described as "A" in [Table 2]) and the other was slightly good (described as "B" in [Table 2]), and to be poor (described as "C" in [Table 2]) when both of the evaluations of the high-temperature cooking odor and the laminating strength were slightly good (described as "B" in [Table 2]) or either of the evaluations of the high-temperature cooking odor and the laminating strength was poor (described as "C" in [Table 2]).

[0425] As shown in [Table 2], the comprehensive evaluation of Examples 1 to 18 and 23 to 29 was A. The comprehensive evaluation of Examples 19 to 22, 30, and 31 was B.

[0426] Comparative Example 1 had a comprehensive evaluation of C because the evaluation of the odor was C.

[0427] Comparative Examples 2 to 8 and 12 to 20 had a comprehensive evaluation of C because the evaluations of the high-temperature cooking odor and the strength were B.

[0428] Comparative Examples 9 to 11 had a comprehensive evaluation of C because the evaluation of the strength was C.

[0429] Hereinafter, embodiments of the present application will be described with reference to the drawings. In all the drawings, even when the embodiments are different, the same or equivalent components are denoted by the same symbols, and common descriptions are omitted. There are cases where the same or equivalent components are denoted by different symbols even when they are the same or equivalent to the above-described embodiments. In addition, the positional relationship of up, down, left, right, and the like is based on the positional relationship shown in the drawings unless particularly limited.

[0430] Hereinafter, when a plurality of preferable numerical ranges are exemplified in a specific numerical range, a combination of an upper limit value and a lower limit value is not limited to the exemplified combination as long as it is included in the preferable maximum numerical range, unless specifically limited. For example, when "x1 or more and x4 or less" and "x2 or more and x3 or less" are exemplified as preferable ranges of a quantity X, with x1 < x2 < x3 < x4, each numerical range such as "more than x1 and less than x4", "x2 or more and x4 or less", "x3 or more and x4 or less" is also a preferable range.

[0431] [Sixth Embodiment]

[0432] A laminated film of the sixth embodiment of the present application will be described.

[0433] Figure 9 A schematic cross-sectional view showing an example of the laminated film of the sixth embodiment of the present application.

[0434] Figure 9 The laminated film 350 of the present embodiment shown has a substrate film (a prescribed layer) 310, an adhesive layer 320, and a sealant layer 330. The substrate film 310, the adhesive layer 320, and the sealant layer 330 in the laminated film 350 are sequentially laminated. The substrate film 310, the adhesive layer 320, and the sealant layer 330 each have a light-transmitting property of transmitting visible light.

[0435] Therefore, the laminated film 350 has a light-transmitting portion in which visible light is transmitted in the thickness direction (the upward and downward direction in the drawing). Figure 9 In the example shown, the light-transmitting portion is the entirety of the laminated film 350. Further, the laminated film 350 can also not have a light-transmitting portion.

[0436] The light-transmitting portion of the laminated film 350 has a haze of 30% or less as measured according to the haze measurement method prescribed in JIS-K-7136. Hereinafter, the haze prescribed in JIS-K-7136 will be simply referred to as "haze".

[0437] The substrate film 310 has a resin layer 312 and a barrier layer 314. Further, the substrate film 310 can also not have the barrier layer 314.

[0438] The resin layer 312 is composed of, for example, a resin film.

[0439] As the resin film, for example, a polyester film formed of polyethylene terephthalate (PET), polyethylene naphthalate (PEN), or the like; a polyolefin film formed of polyethylene, polypropylene, or the like; a polystyrene film; a polyamide film formed of 66-nylon or the like; a polycarbonate film; an acrylonitrile film; a polyimide film; and an engineering plastic film formed of other engineering plastics, or the like can be given.

[0440] The resin film constituting the resin layer 312 can be one of the above-described resins alone, or two or more of the above-described resins in combination.

[0441] For example, the resin layer 312 can be constituted by laminating a plurality of the same resin film.

[0442] The resin film can be either a stretched film or an unstretched film. The resin film can also be a multilayer film in which at least one stretched film and at least one unstretched film are laminated.

[0443] The resin layer 312 can also have a film that is arbitrarily stretched in a biaxial direction. In this case, the mechanical strength and dimensional stability can be improved.

[0444] The resin layer 312, particularly from the viewpoint of balancing strength and flexibility, is more preferably provided with one or both of a polyester film and a biaxially stretched polypropylene film.

[0445] The resin layer 312, particularly from the viewpoint of improving strength and reducing cost, is more preferably provided with one or both of a polypropylene film and a polyethylene terephthalate film.

[0446] The resin layer 312, particularly from the viewpoint of improving strength, is more preferably provided with a nylon film. A nylon film is excellent in flexibility, and thus it is difficult to cause a pinhole. Therefore, when a packaging bag using the laminated film 350 is used to form a packaging body, it is possible to suppress the occurrence of a pinhole in the laminated film 350, and thus deterioration of the packaged product. This effect is particularly useful when the packaged product is a food product.

[0447] The thickness of the resin layer 312 can be a thickness corresponding to the use or the desired characteristics, and is not particularly limited. The thickness of the resin layer 312 can be, for example, 3 μm or more and 100 μm or less, and is more preferably 6 μm or more and 50 μm or less.

[0448] The resin layer 312 can also contain an appropriate additive. As the additive, at least one selected from the group consisting of a filler, an antistatic agent, a plasticizer, a lubricant, and an antioxidant, and the like can be cited.

[0449] The surface 312a of the resin layer 312 is a surface that forms the outer surface of the laminated film 350 when the packaging bag is formed.

[0450] The surface 312b of the resin layer 312 is a surface on the side opposite to the surface 312a in the thickness direction, and is a bonding surface with the barrier layer 314 described later.

[0451] The laminated film 350 can also be subjected to an appropriate surface treatment. For example, the surface 312b can be subjected to an appropriate surface treatment that improves the adhesion of the barrier layer 314. As examples of the surface treatment, at least one selected from the group consisting of a chemical agent treatment, a solvent treatment, a corona treatment, a plasma treatment, and an ozone treatment can be cited.

[0452] The barrier layer 314 is a layer having barrier properties against at least oxygen and water vapor. The barrier layer 314 is laminated on the surface 312b of the resin layer 312.

[0453] The number of layers of the barrier layer 314 is not particularly limited as long as it contains at least one layer having barrier properties.

[0454] For example, as an example in which the barrier layer 314 is formed of a single layer, there are an evaporation layer formed of an inorganic substance, a barrier film formed of a resin having barrier properties, and the like.

[0455] For example, as an example in which the barrier layer 314 is formed of a plurality of layers, there are a barrier film formed by applying an inorganic substance having barrier properties on the surface of a resin film or the like.

[0456] As the inorganic substance that can be used in the barrier layer 314, there are silicon dioxide, aluminum, silicon, and the like. Such an inorganic substance can be evaporated on the surface of the resin layer 312 when the barrier layer 314 is formed of a single layer.

[0457] As the barrier film that can be used in the barrier layer 314, there are a nylon-based barrier film, an ethylene-vinyl alcohol-based barrier film, and the like. Such a barrier film can be laminated on the resin layer 312 by extrusion lamination, dry lamination, wet lamination, or the like when the barrier layer 314 is formed of a single layer.

[0458] For example, when the barrier film on which an inorganic substance is applied is used as the barrier layer 314, as the inorganic substance, there are silicon dioxide, aluminum, silicon, and the like. At this time, the barrier film can be laminated on the resin layer 312 by dry lamination or the like.

[0459] The barrier layer 314 can be used alone or in combination with two or more of the above examples.

[0460] The thickness of the barrier layer 314 is not particularly limited. For example, when the barrier layer 314 is formed of an evaporation layer, the thickness can be 5 nm or more and 100 nm or less.

[0461] The barrier layer 314 can be formed, for example, by a vacuum evaporation method, a sputtering method, an ion plating method, a plasma vapor deposition method (CVD), a dry lamination method, an extrusion lamination method, or the like.

[0462] The adhesive layer 320 is a layer that adheres the barrier layer 314 to a sealant layer 330 described later.

[0463] The adhesive layer 320 contains an adhesive component and a multivalent metal particle or a multivalent metal compound particle mixed in the adhesive component.

[0464] As the adhesive component, for example, a urethane-based adhesive, a polyester-based adhesive, a polyamide-based adhesive, an epoxy-based adhesive, and an isocyanate-based adhesive, or the like, can be given.

[0465] The adhesive component in the adhesive layer 320 is more preferably formed of a two-component curable adhesive from the viewpoint of easily suppressing deterioration of the multivalent metal particles or the multivalent metal compound particles described later.

[0466] Such a deterioration suppression effect has a tendency to be more remarkably exhibited when a two-component curable urethane-based adhesive is used. Therefore, in the two-component curable adhesive, a urethane-based adhesive is particularly preferably used.

[0467] The multivalent metal particles are particles formed of a metal that generates a multivalent ion (hereinafter referred to as a multivalent metal). The multivalent metal compound particles are particles formed of a compound of the multivalent metal.

[0468] The purpose of using the multivalent metal particles or the multivalent metal compound particles is to capture substances (hereinafter sometimes referred to as odor origin substances) such as sulfur compounds and the like, which cause a high-temperature cooking odor, in the adhesive layer 320.

[0469] The principle by which the multivalent metal particles and the multivalent metal compound particles can capture the odor origin substances is not clear in theory, but it can be determined through experiments that they are effective in reducing the odor origin substances.

[0470] The multivalent metal particles and the multivalent metal compound particles mixed in the adhesive layer 320 have a capturing effect of the compounds that cause a high-temperature cooking odor, and there is no particular limitation as long as they are stably present in the interior of the adhesive component of the adhesive layer 320.

[0471] As the multivalent metal particles, for example, particles of alkaline earth metals such as beryllium, magnesium, calcium, and the like; particles of transition metals such as titanium, zirconium, chromium, manganese, iron, cobalt, nickel, copper, zinc, and the like; and particles of aluminum, or the like, can be used.

[0472] The multivalent metal particles can be formed with an oxide film on the surface or can be surface-coated in a manner that is easily stably present in the interior of the adhesive layer 320.

[0473] As the multivalent metal compound particles, for example, particles of oxides, hydroxides, carbonates, organic acid salts (for example, acetates), inorganic acid salts, and the like, of the multivalent metal can be given. As the multivalent metal compound particles, for example, particles of an ammonium complex of a multivalent metal oxide, a secondary amine to quaternary ammonium complex of a multivalent metal oxide, or a carbonate or an organic acid salt thereof can also be used.

[0474] From the viewpoint of more stably existing inside the adhesive layer 320, it is more preferable to use the polyvalent metal compound particles.

[0475] As the polyvalent metal compound particles, from the viewpoints of stability in the adhesive component and ease of manufacture, it is more preferable to use particles of a zinc compound, an aluminum compound, a magnesium compound, or the like. From the viewpoints of ease of handling and cost, as the polyvalent metal compound particles, it is particularly preferable to use particles of zinc oxide, aluminum oxide, magnesium oxide, or the like.

[0476] Hereinafter, for simplicity, the polyvalent metal particles or the polyvalent metal compound particles mixed in the adhesive component are sometimes referred to as "additive particles".

[0477] In the adhesive layer 320, one or two or more kinds of additive particles mixed in the adhesive component can be used.

[0478] The content of the additive particles in the adhesive layer 320 is not particularly limited.

[0479] The more the content of the additive particles, the more the amount of the odor origin substance captured increases, and thus the high-temperature cooking odor is more easily suppressed. On the other hand, when the content of the additive particles increases, there is a possibility that the laminate strength of the adhesive layer 320 easily decreases or the transparency of the laminate film 350 decreases.

[0480] For example, from the viewpoint of easily balancing the laminate strength of the adhesive layer 320 and the transparency of the laminate film and the reducing effect of the high-temperature cooking odor, the content of the additive particles in the adhesive layer 320 is more preferably 0.5% by mass or more and 10% by mass or less, and further preferably 1.5% by mass or more and 5% by mass or less.

[0481] When the content of the additive particles is less than 1% by mass, there is a possibility that the suppressing effect of the high-temperature cooking odor becomes too low.

[0482] When the content of the additive particles exceeds 10% by mass, there is a possibility that the laminate strength of the adhesive layer 320 becomes too low or the transparency of the laminate film becomes too low.

[0483] The distribution of the additive particles in the adhesive layer 320 is more preferably less biased. For example, when the distribution of the additive particles is concentrated in a particular portion due to agglomeration or the like, the transparency in the laminate film 350 easily becomes uneven. The distribution of the additive particles in the adhesive layer 320 can also be a cause of reducing the haze or reducing the laminate strength.

[0484] In particular, in the adhesive layer 320, when large aggregates of the additive particles are formed, it is easy to become conspicuous as a granular unevenness. In particular, when the granular unevenness is arranged adjacent to each other, it is easy to form a striped unevenness and become more conspicuous. For example, when the laminated film 350 is used in a packaging bag, when the contents of the packaging bag are visible from the outside through a light-transmitting portion, it is preferable that the granular unevenness or the striped unevenness is not visible.

[0485] For example, from the viewpoint of improving the lamination strength of the adhesive layer 320, it is preferable that the number of aggregates of the additive particles in the range of 500 μm x 500 μm is 30 or less, and is 9.0 μm or more. In addition, it is preferable that the distance between the aggregates is 100 μm or more.

[0486] Here, the "aggregate" is used in a broad sense, and refers to an "appearance lump" when observed in the thickness direction using a microscope or the like. The "appearance lump" is formed due to the aggregation phenomenon of the additive particles, or is visible as a lump due to the high distribution density when observed in the thickness direction from a certain region, and is not particularly distinguished.

[0487] For example, it is considered that the additive particles capture the odor source substance by adsorbing and permeating the odor source substance in the adhesive layer 320.

[0488] In order for the additive particles to efficiently capture the odor source substance, it is more preferable that the specific surface area of the additive particles is larger. Here, the specific surface area indicates the surface area per unit mass of the additive particles. For example, the specific surface area of the additive particles can be 1 m 2 / g or more, and more preferably 5 m 2 / g or more.

[0489] When the specific surface area is increased, the particle diameter of the additive particles becomes too small, and for example, it becomes easy to scatter into the environment, and thus attention is required at the time of handling. From the viewpoint of making the handling of the additive particles easy in the manufacturing process, the specific surface area of the additive particles can also be 100 m 2 / g or less, and more preferably 50 m 2 / g.

[0490] When the average particle diameter of the primary particles of the additive particles is too large, it is easy to form aggregates exceeding 9.0 μm, and thus it is more preferable that the average particle diameter of the additive particles is small. However, when the average particle diameter is somewhat small in the additive particles, the maximum diameter of the aggregates varies depending on the mixing method in the manufacturing process, and the correlation between the size of the average particle diameter and the maximum diameter of the aggregates is weakened.

[0491] The average particle diameter of the additive particles is not particularly limited and is, for example, 5 nm or more and 100 nm or less, more preferably 10 nm or more and 60 nm or less, and further preferably 20 nm or more and 45 nm or less.

[0492] The average particle diameter of the additive particles is not particularly limited and is, for example, 5 nm or more and 100 nm or less, more preferably 10 nm or more and 60 nm or less, and further preferably 20 nm or more and 45 nm or less.

[0493] For example, when the average particle diameter of the additive particles is less than 5 nm, there is a possibility that the manufacturing cost increases or the handling in the manufacturing process becomes difficult.

[0494] For example, when the average particle diameter of the additive particles exceeds 100 nm, there is a possibility that the capturing effect of the odor origin substance decreases due to the decrease in the specific surface area.

[0495] In order to reduce the size of the agglomerates of the additive particles in the adhesive component, 1 part by mass or more and 50 parts by mass or less of a dispersant with respect to 100 parts by mass of the additive particles can also be contained in the adhesive layer 320.

[0496] The kind of the dispersant is not particularly limited as long as the additive particles can be dispersed in the liquid adhesive component used for forming the adhesive component.

[0497] For example, as the dispersant, (poly)ester salts, polyether phosphates, alkyl sulfate salts, alkylbenzenesulfonic acid salts, alkylnaphthalenesulfonic acid salts, alkylsulfosuccinic acid salts, alkyl diphenyl ether disulfonic acid salts, alkyl phosphate salts, aromatic phosphates, polyoxyethylene alkyl ethers, polyoxyethylene alkylphenol ethers, polyoxyethylene alkyl esters, alkylallyl sulfate salts, polyoxyethylene alkyl phosphates, sorbitan alkyl esters, glycerin fatty acid esters, sorbitan fatty acid esters, sucrose fatty acid esters, polyethylene glycol fatty acid esters, polyoxyethylene sorbitan alkyl esters, polyoxyethylene alkylallyl ethers, polyoxyethylene derivatives, polyoxyethylene sorbitol fatty acid esters, polyoxy fatty acid esters, polyoxyethylene alkylamines, vinyl chloride-vinyl acetate copolymers, and the like can be given. These dispersants can be used alone, and two or more kinds thereof can also be used in combination.

[0498] The lamination strength of the adhesive layer 320 is measured according to JIS Z 0238:1998 using a T-type peeling method (crosshead speed: 300 mm / minute) using a tensile tester.

[0499] The laminating strength of the adhesive layer 320 is, for example, 6 N / 15 mm width or more, and more preferably 7 N / 15 mm width or more.

[0500] The thickness of the adhesive layer 320 is not particularly limited as long as the laminating strength is good when the laminate film 350 is formed into a packaging bag, and the reduction effect of the odor-causing substance is good.

[0501] The thickness of the adhesive layer 320 is, for example, 0.01 μm or more and 5 μm or less, and more preferably 0.03 μm or more and 3 μm or less.

[0502] When the thickness of the adhesive layer 320 is less than 0.01 μm, there is a possibility that the laminating strength will decrease and the amount of captured odor-causing substances will be too small.

[0503] When the thickness of the adhesive layer 320 exceeds 5 μm, there is a possibility that the laminate film 350 will become too thick.

[0504] The sealant layer 330 is a layer for adhering the laminate film 350 to another laminate film by heat fusion bonding. The sealant layer 330 is not particularly limited as long as it can be fused by heat and fusion-bonded to a sealant layer in another laminate film.

[0505] As the material of the sealant layer 330, for example, low-density polyethylene, medium-density polyethylene, high-density polyethylene, linear (thread-like) low-density polyethylene, polypropylene, ethylene-vinyl acetate copolymer, ionomer resin, ethylene-acrylic acid copolymer, ethylene-methyl acrylate copolymer, ethylene-methacrylic acid copolymer, ethylene-propylene copolymer, and the like can be given. The resin used in the sealant layer 330 can use any one of the exemplified resins alone, and two or more can be used in combination.

[0506] For example, when a packaging body subjected to boiling sterilization or high-temperature retort sterilization is formed by the laminate film 350, from the viewpoint of maintaining sufficient adhesion, it is more preferable that the sealant layer 330 contain a polypropylene resin that is not stretched.

[0507] The sealant layer 330 can be formed by extruding a resin composition onto the adhesive layer 320 and laminating the resin composition, or a sheet of the film can be adhered to the adhesive layer 320.

[0508] The thickness of the sealant layer 330 is, for example, 10 μm or more and 150 μm or less, and more preferably 30 μm or more and 80 μm or less.

[0509] Next, an example of a method for manufacturing the laminate film 350 will be described.

[0510] First, the base material film 310 on which the barrier layer 314 is laminated on the resin film forming the resin layer 312 is prepared.

[0511] Subsequently, the adhesive layer 320 and the sealant layer 330 are sequentially laminated on the barrier layer 314 of the base material film 310.

[0512] As the lamination method, for example, dry lamination can be used.

[0513] For example, a coating liquid in which the additive particles are mixed in an adhesive forming the adhesive layer 320 after curing is prepared, the coating liquid is coated on the surface of the barrier layer 314 of the base material film 310 by a dry lamination machine, and the resin film forming the sealant layer 330 and the base material film 310 are heat-pressed using a hot roller.

[0514] The coating method of the coating liquid is not particularly limited. For example, the coating liquid can be coated using a roll coater, a reverse roll coater, a gravure coater, a microgravure coater, a blade coater, a bar coater, a wire bar coater, a die coater, a dip coater, a spin coater, or the like.

[0515] Further, as the lamination method, a solventless lamination machine can be used, and a coating liquid in which a solventless adhesive additive particle is mixed in an adhesive component of the adhesive layer 320 can also be used.

[0516] When the coating liquid is prepared, it is preferable to mix the additive particles in an adhesive forming an adhesive component, and to sufficiently stir in a manner that the size of the aggregate of the additive particles reaches 9.0 μm or less. By stirring, the additive particles are dispersed in the coating liquid.

[0517] In order to reduce the size of the aggregate of the additive particles, it is more preferable to add a dispersant to the coating liquid. The dispersant can be directly added to the adhesive together with the additive particles, but it is more preferable to prepare the coating liquid by mixing and stirring the particle dispersion liquid in which the additive particles and the dispersant are dispersed in a solvent, and the adhesive after the particle dispersion liquid. At this time, the dispersion of the additive particles in the coating liquid can be promoted.

[0518] The additive particles are more preferably subjected to a physical defibration treatment in which the additive particles are finely divided in a state in which the additive particles, the dispersant, and the solvent are mixed. Thereby, the fine division and dispersion of the additive particles in the coating liquid can be promoted.

[0519] As the physical defibration treatment, high-pressure homogenizer, ultrahigh-pressure homogenizer, ball mill, roll mill, chopper, planetary mill, jet mill, attritor, grinder, juicer mixer, homogenizer, ultrasonic homogenizer, microfluidic high-pressure homogenizer, underwater opposed impact, and the like can be exemplified.

[0520] By using one or more of the above-described means, the dispersion treatment of dispersing the fine added material particles in the coating liquid is performed, and the growth of the agglomerates in the coating liquid can be suppressed.

[0521] By performing the dispersion treatment, the generation of the precipitates in the coating liquid can also be suppressed, and thus the added material particles can be efficiently dispersed in the coating liquid.

[0522] After the coating liquid is prepared, it is more preferable to perform the filtration treatment before coating.

[0523] The laminated film 350 can suppress the permeation of oxygen and water vapor, which have permeated the resin layer 312, through the adhesive layer 320 and the sealant layer 330, because it has the barrier layer 314 having barrier properties against oxygen and water vapor. Thus, the permeation of oxygen and water vapor and the like into the packaging bag can be suppressed. In the packaging body in which the packaging bag formed of the laminated film 350 contains the packaged article, the deterioration of the packaged article due to at least one of oxygen and water vapor can be suppressed. The deterioration of the polyvalent metal particle or the polyvalent metal compound particle due to at least one of the permeated oxygen and water vapor from the outside can also be similarly suppressed.

[0524] The laminated film 350 can adsorb the odor source substances such as sulfur compounds, which have permeated the sealant layer 330 and penetrated into the adhesive layer 320, because it has the adhesive layer 320 containing the polyvalent metal particle or the polyvalent metal compound particle between the base film 310 and the sealant layer 330. Thus, in the packaging body in which the packaging bag formed of the laminated film 350 contains the packaged article, the odor source substances such as sulfur compounds originating from the packaged article penetrate into the adhesive layer 320, and are captured by the polyvalent metal particle or the polyvalent metal compound particle. As a result, the high-temperature cooking odor in the packaged article can be reduced.

[0525] By containing the polyvalent metal particle or the polyvalent metal compound particle, the reduction in the lamination strength of the adhesive layer 320 can be suppressed. Since the polyvalent metal particle or the polyvalent metal compound particle is mixed in the adhesive component of the adhesive layer 320, the polyvalent metal particle or the polyvalent metal compound particle can also be inhibited from deteriorating by reacting with the components such as acetic acid or amino acid contained in the packaged article. Thus, the reduction effect of the odor source substances and the reduction in the lamination strength over time are difficult.

[0526] As described above, according to the laminated film 350 of the present embodiment, a laminated film in which the high-temperature cooking odor can be reduced and which has a good lamination strength can be provided.

[0527] [Seventh Embodiment]

[0528] The laminated film of the seventh embodiment of the present application will be described.

[0529] Figure 10A schematic cross-sectional view showing one example of the laminated film of the seventh embodiment of the present application.

[0530] Figure 10 In the laminated film 360 of the present embodiment shown, a base material film (a prescribed layer) 310A is provided instead of the base material film 310 in the laminated film 350 of the sixth embodiment.

[0531] The base material film 310A has, in order from the barrier layer 314, the adhesive layer 316 and the intermediate layer 318 between the barrier layer 314 and the adhesive layer 320. The following description focuses on aspects different from the sixth embodiment.

[0532] The adhesive layer 316 is a layer that adheres the barrier layer 314 and the intermediate layer 318.

[0533] The adhesive layer 316 uses one or more of the materials exemplified as the adhesive component in the adhesive layer 320. The adhesive layer 316 can be formed of the same material as the adhesive layer 320 in the laminated film 360, or can be formed of a different material.

[0534] The adhesive layer 316 can contain no additive particles, or can contain additive particles.

[0535] When the adhesive layer 316 contains additive particles, the laminated film 360 is an example in which the laminated film has a plurality of adhesive layers containing additive particles.

[0536] When the adhesive layer 316 contains additive particles, the kind, content, specific surface area, layer thickness, and average particle diameter of the additive particles in the adhesive layer 316 are not particularly limited.

[0537] For example, the kind, content, specific surface area, layer thickness, and average particle diameter of the additive particles in the adhesive layer 316 are more preferably the same kind and the preferable numerical range exemplified for the adhesive layer 320 in the laminated film 350.

[0538] The kind, content, specific surface area, layer thickness, and average particle diameter of the adhesive layer 320 in the laminated film 360 are also the same.

[0539] When the adhesive layer 316 contains additive particles, the maximum diameter and distribution of the aggregates of the additive particles in the laminated film 360 are not particularly limited.

[0540] The maximum diameter of the aggregates of the additive particles in the laminated film 360 is more preferably the preferable range for the adhesive layer 320, 316 in the laminated film 360, respectively, as the adhesive layer 320 in the laminated film 350.

[0541] The distribution of the aggregate of the additive particles in the laminated film 360 is more preferably the same as the preferable range of the adhesive layer 320 in the laminated film 350.

[0542] The intermediate layer 318 is a resin layer disposed between the barrier layer 314 and the sealant layer 330. The intermediate layer 318 is adhered to the barrier layer 314 via the adhesive layer 316 and is adhered to the sealant layer 330 via the adhesive layer 320.

[0543] The material of the intermediate layer 318 is not particularly limited.

[0544] The kind of the intermediate layer 318 can be appropriately selected depending on the use of the laminated film 360. If a resin film having at least one property of, for example, oxygen barrier property, water vapor barrier property, mechanical strength, bending resistance, puncture resistance, impact resistance, abrasion resistance, cold resistance, heat resistance, chemical resistance, and light resistance is excellent is selected, the property is improved in the laminated film 360.

[0545] For example, as a preferable material of the intermediate layer 318, a film of nylon, polyethylene terephthalate, polyamide, polyethylene, polypropylene, polyvinyl chloride, polycarbonate, polyvinyl alcohol, ethylene-propylene copolymer, and ethylene-vinyl acetate copolymer saponate, or a resin film having a vapor-deposited layer can be mentioned.

[0546] For example, by using nylon as the intermediate layer 318, the softness is improved, and the occurrence of pinholes can be suppressed even when a large external force is applied. Thus, when a packaging body is formed using a packaging bag using the laminated film 350, the occurrence of pinholes in the laminated film 360 can be suppressed, and deterioration of the packaged product can be suppressed. This effect is particularly useful when the packaged product is a food product.

[0547] The laminated film 360 of the present embodiment can be manufactured in the same manner as the laminated film 350 except that the base material film 310A in which the adhesive layer 316 and the intermediate layer 318 are laminated on the barrier layer 314 is formed instead of the base material film 310.

[0548] In particular, when the adhesive layer 316 contains the additive particles, the adhesive layer 316 can be manufactured in the same manner as the adhesive layer 320 of the sixth embodiment.

[0549] The laminated film 360 according to the present embodiment has the same configuration as the laminated film 350 of the sixth embodiment except that the adhesive layer 316 and the intermediate layer 318 are laminated between the barrier layer 314 and the adhesive layer 320, and thus a laminated film in which high-temperature cooking off-flavor can be reduced and which has good lamination strength can be provided.

[0550] In particular, according to the laminated film 360, the properties of the laminated film 360 can be improved in correspondence with the properties of the intermediate layer 318 because the intermediate layer 318 is included.

[0551] Further, when the multivalent metal particles or the multivalent metal compound particles are included in the adhesive layer 316, the effect of reducing the odor-causing substance can be improved because there are two layers in which the odor-causing substance is captured.

[0552] [The eighth embodiment]

[0553] The laminated film of the eighth embodiment of the present application will be described.

[0554] Figure 11 A schematic cross-sectional view showing an example of the laminated film of the eighth embodiment of the present application.

[0555] Figure 11 The laminated film 370 of the present embodiment shown is provided with a substrate film (a prescribed layer) 310B instead of the substrate film 310A in the laminated film 370 of the seventh embodiment. The laminated film 370 has the resin layer 312, the adhesive layer 316, the intermediate layer 318, the adhesive layer 316B, and the intermediate layer 318B laminated in this order. The following description will focus on aspects different from those of the seventh embodiment.

[0556] The adhesive layer 316 is a layer that adheres the resin layer 312 and the intermediate layer 318. The adhesive layer 316B is a layer that adheres the intermediate layer 318 and the intermediate layer 318B.

[0557] The adhesive layers 316, 316B use one or more of the materials exemplified as the adhesive component in the adhesive layer 320. The adhesive layers 316, 316B can be formed of the same material as the adhesive layer 320 in the laminated film 370, or can be formed of a different material.

[0558] The adhesive layers 316, 316B can include no additive particles, or can include additive particles.

[0559] When the adhesive layers 316, 316B include additive particles, the laminated film 370 is an example in which the laminated film has a plurality of adhesive layers that include additive particles.

[0560] When the adhesive layers 316, 316B include additive particles, the kind, the content, the specific surface area, the layer thickness, and the average particle diameter of the additive particles in the adhesive layers 316, 316B are not particularly limited.

[0561] For example, the kind, the content, the specific surface area, the layer thickness, and the average particle diameter of the additive particles in the adhesive layers 316, 316B are more preferably the same kind and the preferable numerical range exemplified for the adhesive layer 320 in the laminated film 350.

[0562] The kind, content, specific surface area, layer thickness, and average particle diameter of the adhesive layer 320 in the laminated film 370 are also the same.

[0563] When the additive particles are contained in the adhesive layers 316, 316B, the maximum diameter and distribution of the additive particle aggregates in the laminated film 370 are not particularly limited.

[0564] The maximum diameter of the additive particle aggregates in the laminated film 370 is more preferably in the preferable range of the adhesive layers 316, 316B in the laminated film 370, respectively, than the adhesive layer 320 in the laminated film 350.

[0565] The distribution of the additive particle aggregates in the laminated film 370 is more preferably in the preferable range of the adhesive layers 316, 316B in the laminated film 370, respectively, than the adhesive layer 320 in the laminated film 350.

[0566] The intermediate layer 318 is a resin layer disposed between the resin layer 312 and the intermediate layer 318B. The intermediate layer 318 is adhered to the resin layer 312 via the adhesive layer 316 and is adhered to the intermediate layer 318B via the adhesive layer 316B.

[0567] The material of the intermediate layer 318 is not particularly limited.

[0568] The kind of the intermediate layer 318 can be appropriately selected depending on the use of the laminated film 370. If a resin film having at least one property selected from the group consisting of excellent oxygen barrier property, water vapor barrier property, mechanical strength, bending resistance, puncture resistance, impact resistance, abrasion resistance, cold resistance, heat resistance, chemical resistance, and light resistance is selected as the intermediate layer 318, the property is improved in the laminated film 370.

[0569] For example, as a preferable material of the intermediate layer 318, a film of nylon, polyethylene terephthalate, polyamide, polyethylene, polypropylene, polyvinyl chloride, polycarbonate, polyvinyl alcohol, ethylene-propylene copolymer, ethylene-vinyl acetate copolymer saponate, or the like, or a resin film having a vapor-deposited layer can be mentioned.

[0570] For example, by using nylon as the intermediate layer 318, the softness is improved, and the occurrence of pinholes can be suppressed even when a large external force is applied. Thus, when a packaging body is formed using a packaging bag using the laminated film 370, the occurrence of pinholes in the laminated film 370 can be suppressed, and deterioration of the packaged product can be suppressed. This effect is particularly useful when the packaged product is a food product.

[0571] The intermediate layer 318B is a resin layer disposed between the intermediate layer 318 and the sealant layer 330. The intermediate layer 318B is adhered to the intermediate layer 318 via the adhesive layer 316B and is adhered to the sealant layer 330 via the adhesive layer 320.

[0572] For example, an aluminum film sheet can be used as the intermediate layer 318, 318B. The aluminum film sheet has a characteristic of being difficult to pass gas or liquid and to shield light. Therefore, when a packaging body is formed using the packaging bag using the laminated film 370, deterioration of the packaged product can be suppressed. In addition, since odor does not escape, flavor deterioration due to escape of aroma can be suppressed. This effect is particularly useful when the packaged product is food.

[0573] According to the laminated film 370 of the present embodiment, a laminated film that can reduce high-temperature retort odor while having good lamination strength can be provided.

[0574] [Ninth Embodiment]

[0575] A packaging bag and a packaging body of the ninth embodiment of the present application will be described.

[0576] Figure 12 A schematic front view showing an example of the packaging bag and the packaging body of the ninth embodiment of the present application.

[0577] As shown in Figure 12 the packaging body 500 of the present embodiment includes the packaging bag 400 of the present embodiment and a packaged product 410 housed inside the packaging bag 400.

[0578] The packaging bag 400 includes a sealed portion 401 in which edges of a pair of laminated films 350 cut into a substantially rectangular shape are adhered, and a housing portion 402 formed between the pair of laminated films 350 surrounded by the sealed portion 401. That is, the side end portion, the lower end portion, and the upper end portion of the packaging bag 400 are sealed by the sealed portion 401.

[0579] The housing portion 402 is sandwiched between the pair of laminated films 350 to form a housing space surrounded by the sealed portion 401, and the packaged product 410 such as food is housed therein.

[0580] For example, the packaging body 500 can also be a high-temperature retort food in which the packaged product 410 formed of food is heat sterilized and sealed with the packaging bag 400.

[0581] The pair of laminated films 350 are formed by cutting the laminated film 350 of the sixth embodiment into an appropriate size.

[0582] The pair of laminated films 350 are overlapped in a manner in which the respective sealant layers 330 face each other. The respective sealant layers 330 are heat-fusibly bonded at the outer peripheral portions of the pair of laminated films 350. Thereby, the sealed portion 401 is formed.

[0583] The packaging bag 400 has an opening portion 420. For example, the opening portion 420 has a pair of easy-open processing portions 424 formed in the sealing portion 401 at the side end and a semi-tangent line 421 forming a cutting track between the pair of easy-open processing portions 424.

[0584] The easy-opening processing section 424 is not particularly limited as long as it allows the packaging bag 400 to be easily opened. For example, the easy-opening processing section 424 can be formed by a group of traces formed by a collection of micro-recesses formed on the surface of the sealing section 401. For example, the easy-opening processing section 424 can also be a cut that extends through the thickness direction at the end edge of the sealing section 401. The shape of the cut is not particularly limited, and can be, for example, a V-shaped, U-shaped, or I-shaped cut.

[0585] For example, the semi-tangent 421 can be formed by laser processing.

[0586] The manufacturing methods of the packaging bag 400 and the packaging body 500 are described.

[0587] Figure 13 This is a schematic perspective view illustrating a method for manufacturing a packaging bag according to the ninth embodiment of the present invention.

[0588] Prepare a pair of laminated films 350 to be cut according to the shape of the packaging bag 400.

[0589] After that, as Figure 13 As shown, the sealant layers 330 of each laminated film 350 are made to face each other, and the sealant layers 330 at the lower end and side end of each laminated film 350 are thermally fused together.

[0590] Thus, a sealing portion 401 is formed on the lower end and the side end. A receiving portion 402 is formed inside each of the U-shaped laminated films 350 surrounded by the sealing portion 401.

[0591] An opening is formed at the upper end of the packaging bag 400, which connects to the receiving part 402.

[0592] Next, the packaged item 410 is filled into the upper part of the unsealed packaging bag 400. Then, the sealant layers 330 of the stacked films 350 facing each other are thermally fused together at the upper part, forming a sealing portion 401 at the upper part as well. In this way, a package can be manufactured. Figure 12 The package shown is 500.

[0593] In the packaging bag 400 of this embodiment, the receiving portion 402 is formed by the same laminated film 350 as in the sixth embodiment.

[0594] Each laminated membrane 350, due to the presence of a barrier layer 314, can suppress the permeation of oxygen and water vapor from the outside to the inside, and can suppress the deterioration of components and packaged contents 410 that are further inside the barrier layer 314 due to oxygen and water vapor.

[0595] Each laminated film 350 contains polyvalent metal particles or polyvalent metal compound particles in the adhesive layer 320, which is located further inside the barrier layer 314 (on the packaged item side). Therefore, it can adsorb sulfur compounds and other high-temperature cooking odor-generating substances produced by the packaged item 410 for an extended period. Thus, the packaging bag 400 can suppress the accumulation of high-temperature cooking odor-generating substances inside the packaged item 410 within the receiving section 402.

[0596] As a result, the high-temperature cooking odor generated when the package is opened can be reduced by 500 degrees Celsius.

[0597] The packaged material 410 may sometimes contain, depending on its type, components that degrade the trapping effect of polyvalent metal particles or polyvalent metal compound particles, thereby impairing their ability to capture off-flavors during high-temperature cooking (deterioration source components). For example, acids such as acetic acid contained in various foods are prone to degrading polyvalent metal particles or polyvalent metal compound particles.

[0598] In this embodiment, since the polyvalent metal particles or polyvalent metal compound particles are mixed in the adhesive component and covered by the adhesive component, the chemical reaction between the polyvalent metal particles or polyvalent metal compound particles and the deterioration-originating component can be suppressed, thus making it difficult for the polyvalent metal particles or polyvalent metal compound particles to deteriorate.

[0599] As explained above, the packaging bag 400 and packaging body 500 according to this embodiment, having the laminated film 350 of the sixth embodiment, can provide packaging bags and packaging bodies that can reduce the odor of high-temperature cooking while having good lamination strength, just like the sixth embodiment. Furthermore, even if the laminated film 360 of the seventh embodiment or the laminated film 370 of the eighth embodiment is used instead of the laminated film 350, the same effect is achieved.

[0600] [Tenth Implementation Method]

[0601] The packaging bag and packaging body according to the tenth embodiment of the present invention will be described.

[0602] Figure 14 This is a schematic perspective view showing an example of a packaging bag and packaging body according to the tenth embodiment of the present invention.

[0603] like Figure 14 As shown, the packaging body 510 of this embodiment includes a packaging bag 450 and a packaged item 410, which is the same as that in the ninth embodiment.

[0604] The packaging bag 450 is a stand-up bag having a pair of the laminated films 350 and a bottom tape 452 adhered to the lower end portions of the laminated films 350. The bottom tape 452 is formed of a laminated film having the same layers as the laminated film 350.

[0605] The packaging bag 450 and the packaging body 510 of the present embodiment are formed in the shape of a stand-up bag by including the bottom tape 452, and are otherwise configured similarly to the packaging bag 400 and the packaging body 500 of the ninth embodiment.

[0606] The packaging body 510 can be manufactured by using a known stand-up bag manufacturing method using a pair of the laminated films 350 and the bottom tape 452, after the packaging bag 450 having the opening formed in the upper end portion is manufactured, the contents 410 are filled from the upper end portion, the upper end portion is sealed, and the seal portion 401 is formed.

[0607] The packaging bag 450 and the packaging body 510 of the present embodiment have the laminated film 350 similarly to the ninth embodiment, and thus have the same effects as the ninth embodiment. Further, even if the laminated film 360 of the seventh embodiment or the laminated film 370 of the eighth embodiment is used instead of the laminated film 350, the same effects are obtained.

[0608] Further, in each of the above embodiments, the example in which the entire laminated film 350, 360 is the light-transmitting portion is described.

[0609] However, by providing the printing layer at an appropriate position of the laminated film 350, 360, the light-blocking portion can be formed on a part of the laminated film 350, 360, and the light-transmitting portion can be formed on a part of the laminated film 350, 360.

[0610] For example, when the packaging bag 400 is formed using a pair of the laminated films 350 as in the ninth embodiment, the light-blocking portion formed of the printing layer can be formed on one or both of the pair of the laminated films 350.

[0611] For example, in the laminated film 350, 360, the printing layer can be provided between the resin layer 312 and the barrier layer 314.

[0612] The printing layer is, for example, a layer formed of an ink in which various pigments, plasticizers, drying agents, stabilizers, and the like are added to an adhesive resin such as urethane-based, acrylic-based, nitrocellulose-based, or rubber-based. By the printing layer, characters, patterns, and the like can be displayed. As the printing method, for example, a known printing method such as offset printing, gravure printing, flexographic printing, screen printing, inkjet printing, or the like can be used.

[0613] The surface 312b of the resin layer 312 on which the printing layer is formed can be subjected to corona treatment or ozone treatment as pretreatment. At this time, the adhesion of the printing layer to the resin layer 312 can be improved.

[0614] The layers of the laminated film of the above-described sixth and seventh embodiments are examples. For example, the laminated film can further have an arbitrary layer or film between the adhesive layer 320 and the sealant layer 330, or between the resin layer 312 and the barrier layer 314, within a range that does not significantly impair the function of the laminated film.

[0615] In the above-described explanation of the seventh embodiment, examples in which the adhesive layer 320 of the laminated film 360 contains the polyvalent metal particles or polyvalent metal compound particles and examples in which both of the adhesive layers 320 and 316 of the laminated film 360 contain the polyvalent metal particles or polyvalent metal compound particles are explained. However, the polyvalent metal particles or polyvalent metal compound particles can be contained only in the adhesive layer 316.

[0616] In the above-described explanation of the seventh embodiment, an example in which the intermediate layer is one layer is explained. However, the laminated film can also include two or more intermediate layers.

[0617] The resin layer 312, the adhesive layer 316, the intermediate layer 318, the adhesive layer 316, the aluminum-containing barrier layer 314, the adhesive layer 320, and the sealant layer 330 can also be sequentially laminated.

[0618] The resin layer 312, the adhesive layer 316, the aluminum-containing barrier layer 314, the adhesive layer 320, and the sealant layer 330 can also be sequentially laminated.

[0619] The barrier layer 314, the adhesive layer 316, the intermediate layer 318, the adhesive layer 320, and the sealant layer 330 can also be sequentially laminated.

[0620] The resin layer 312, the adhesive layer 316, the intermediate layer 318, the adhesive layer 320, and the sealant layer 330 can also be sequentially laminated.

[0621] The intermediate layer 318, the adhesive layer 320, and the sealant layer 330 can also be sequentially laminated.

[0622] The resin layer 312, the adhesive layer 320, and the sealant layer 330 can also be sequentially laminated.

[0623] The intermediate layer 318, the barrier layer 314, the adhesive layer 320, and the sealant layer 330 can also be sequentially laminated.

[0624] The sealant layer 330 can also be configured in the same manner as the resin layer 312.

[0625] It can also be configured in a manner in which light shielding properties are imparted by light shielding printing.

[0626] The solid printing layer can also be disposed on the resin layer 312 or the barrier layer 314. For example, when the resin layer 312, adhesive layer 316, intermediate layer 318, adhesive layer 320 and sealant layer 330 are stacked in sequence, the solid printing layer disposed in the resin layer 312 can also be disposed between the resin layer 312 and the adhesive layer 316.

[0627] Alternatively, when resin layer 312, barrier layer 314, adhesive layer 316, intermediate layer 318, adhesive layer 320, and sealant layer 330 are stacked sequentially, the solid printing layer disposed in barrier layer 314 may also be disposed between barrier layer 314 and adhesive layer 316.

[0628] In the ninth embodiment described above, an example of forming a packaging bag 400 and a packaging body 500 using a pair of laminated films 350 was used.

[0629] However, as Figure 12 , 13 As shown, a pair of laminated films 360 and 370 can be used to form a packaging bag 400A and a packaging body 500A instead of a pair of laminated films 350.

[0630] The packaging bag 400A and the packaging body 500A can be manufactured in the same way as the packaging bag 400 and the packaging body 500, except that a pair of laminated films 360 are used instead of a pair of laminated films 350.

[0631] Packaging bag 400A and packaging body 500A have the same function as the laminated film 360 because they have a pair of laminated films 360.

[0632] In the ninth embodiment described above, an example of forming a packaging bag 450 and a packaging body 510 using a pair of laminated films 350 was used.

[0633] However, as Figure 14 As shown, a pair of laminated films 360 and 370 can be used to form a packaging bag 450A and a packaging body 510A instead of a pair of laminated films 350.

[0634] The packaging bag 450A and the packaging body 510A can be manufactured in the same way as the packaging bag 450 and the packaging body 510, except that a pair of laminated films 360 are used instead of a pair of laminated films 350.

[0635] Packaging bag 450A and packaging body 510A have the same function as the laminated film 360 because they have a pair of laminated films 360.

[0636] In the ninth and tenth embodiments described above, examples in which the packaging bag and the packaging body are formed using a pair of the laminated film 350 are described. However, as long as the laminated film 350 is used in a part of the outer peripheral portion of the packaging bag and the packaging body, the laminated film in the other outer peripheral portion can have a layer configuration different from that of the laminated film 350.

[0637] For example, when the polyvalent metal particles or the polyvalent metal compound particles contained in the one laminated film 350 can suppress the high-temperature cooking odor, the polyvalent metal particles or the polyvalent metal compound particles can not be contained in the other laminated film.

[0638] In the ninth and tenth embodiments described above, examples in which the packaging bag is a four-side sealed bag and a stand-up pouch are described, but the shape of the packaging bag is not limited to these, and can have other bag shapes known in the art.

[0639] For example, the shape of the packaging bag can be a two-side sealed bag, a three-side sealed bag, or a clutch bag.

[0640] For example, the packaging bag can have a synthetic resin zipper that can be repeatedly sealed by fitting a container spigot or a belt-shaped protruding portion into a belt-shaped recessed portion.

[0641] The packaging bag can have any one or a plurality of functions of a high-temperature cooking packaging material, a boiling packaging material, a microwave oven packaging material, and the like.

[0642] In the ninth and tenth embodiments described above, examples in which the packaged article 410 is a food are described, but the packaged article 410 is not limited to a food.

[0643] The packaged article 410 can also be curry, chow mein, noodle sauce, liquid seasoning, pasta sauce, side dish, soup, stock for one-pot cooking, and pet food.

[0644] Further, in the agglomerates formed by the polyvalent metal particles or the polyvalent metal compound particles in the range of 500 μm x 500 μm in the adhesive layer 320, the number of agglomerates of 9 μm or more can be 30 or less, and in the adhesive layer 320, the ratio of the minimum diameter of the agglomerates formed by the polyvalent metal particles or the polyvalent metal compound particles to the maximum diameter of the agglomerates can be 14.0 or less.

[0645] [Examples]

[0646] Next, Examples 1 to 31 of the embodiments of the present application are described together with Comparative Examples 1 to 20. Examples 1 to 22 and Comparative Examples 1 to 14 constitute the seventh embodiment of the present application.

[0647] Examples 23 to 31 and Comparative Examples 15 to 20 constitute the eighth embodiment of the present application.

[0648] First, the particle dispersion liquid used in the production of the laminated film of Examples 1 to 31 and Comparative Examples 1 to 20 will be described. Each particle dispersion liquid was used to produce an adhesive containing particles of a polyvalent metal compound.

[0649] The composition and dispersion treatment of the particle dispersion liquid used in the production of the laminated film of Examples 1 to 31 and Comparative Examples 1 to 20 are shown in the following [Table 3].

[0650] [Table 3]

[0651]

[0652] [Particle dispersion liquid 11Aa]

[0653] As shown in [Table 3], the particle dispersion liquid 11Aa was produced by dispersing microparticles of zinc oxide (ZnO) as a polyvalent metal oxide (hereinafter referred to as zinc oxide particles) in ethyl acetate.

[0654] The particle dispersion liquid 11Aa was produced as follows.

[0655] First, zinc oxide particles were added to ethyl acetate as a solvent to form a mixed solution. As the zinc oxide particles, FINEX-30 (trade name; manufactured by Sakai Chemical Industry Co., Ltd.) having an average particle diameter of 35 nm was used. The amount of FINEX (registered trademark)-30 added was an amount in which the solid content concentration of the mixed solution reached 30 mass%.

[0656] Subsequently, dispersant A containing a polyester amide amine salt, alkylcyclohexane, and propylene glycol monomethyl ether acetate was added to the mixed solution. Dispersant A is a dispersant in which an amide amine acid of a high-molecular-weight polyester acid is the main component.

[0657] The amount of dispersant A added was 5 parts by mass based on 100 parts by mass of the solid content of the zinc oxide particles in the mixed solution.

[0658] The mixed solution was subjected to dispersion treatment using a planetary ball mill ([Table 3] is described as "bead mill").

[0659] Thus, the particle dispersion liquid 11Aa in which the zinc oxide particles were dispersed in the solvent was produced.

[0660] [Particle dispersion liquid 11Ba]

[0661] The particle dispersion liquid 11Ba was produced in the same manner as the particle dispersion liquid 11Aa except that the amount of dispersant added was 40 parts by mass.

[0662] [Particle dispersion liquid 11Ca]

[0663] Particle dispersion liquid 11Ca was prepared in the same manner as the particle dispersion liquid 11Aa except that the amount of the dispersant added was 20 parts by mass.

[0664] [Particle dispersion liquids 12Aa, 12Ba]

[0665] Particle dispersion liquid 12Aa was prepared in the same manner as the particle dispersion liquid 11Aa except that a dispersant B containing a phosphate ester was used instead of the dispersant A as the dispersant. The dispersant B is a polyether phosphate ester compound-based dispersant.

[0666] Particle dispersion liquid 12Ba was prepared in the same manner as the particle dispersion liquid 12Aa except that the amount of the dispersant added was 40 parts by mass.

[0667] [Particle dispersion liquids 13Aa, 13Ba]

[0668] Particle dispersion liquid 13Aa was prepared in the same manner as the particle dispersion liquid 11Aa except that a dispersant C containing a vinyl chloride-vinyl acetate-based copolymer, acetone, and methanol was used instead of the dispersant A as the dispersant. The dispersant C is a dispersant in which a vinyl chloride-vinyl acetate copolymer resin is the main component.

[0669] Particle dispersion liquid 13Ba was prepared in the same manner as the particle dispersion liquid 13Aa except that the amount of the dispersant added was 40 parts by mass.

[0670] [Particle dispersion liquids 14Aa, 14Ba, 14Ca]

[0671] Particle dispersion liquid 14Aa was prepared in the same manner as the particle dispersion liquid 11Aa except that zinc oxide particles FINEX (registered trademark) -50 (trade name; manufactured by Sakai Chemical Industry Co., Ltd.) having an average particle diameter of 20 nm in terms of primary particles was used instead of FINEX-30 (registered trademark) having an average particle diameter of 35 nm in terms of primary particles.

[0672] Particle dispersion liquid 14Ba was prepared in the same manner as the particle dispersion liquid 14Aa except that the amount of the dispersant added was 40 parts by mass.

[0673] Particle dispersion liquid 14Ca was prepared in the same manner as the particle dispersion liquid 14Aa except that the amount of the dispersant added was 20 parts by mass.

[0674] [Particle dispersion liquids 15Aa, 15Ba]

[0675] Particle dispersion liquid 15Aa was prepared in the same manner as the particle dispersion liquid 11Aa except that zinc oxide particles FINEX (registered trademark) -20 having an average particle diameter of 60 nm in terms of primary particles was used instead of FINEX (registered trademark) -30.

[0676] Particle dispersion liquid 15Ba was prepared in the same manner as the particle dispersion liquid 15Aa except that the amount of the dispersant added was 40 parts by mass.

[0677] [Particle dispersion liquids 100a, 200a, 300a, 400a]

[0678] Particle dispersion liquid 100a was prepared in the same manner as the particle dispersion liquid 11Aa except that no dispersant was added.

[0679] Particle dispersion liquid 200a was prepared in the same manner as the particle dispersion liquid 100a except that, instead of the zinc oxide particles, aluminum oxide (AI2O3) particles (hereinafter referred to as aluminum oxide particles) manufactured by Fuji Photo Film Co., Ltd. and Gohsen Co., Ltd. were used. The average particle diameter of the aluminum oxide particles was 45 nm.

[0680] Particle dispersion liquid 300a was prepared in the same manner as the particle dispersion liquid 100a except that, instead of the zinc oxide particles, magnesium oxide (MgO) particles (hereinafter referred to as magnesium oxide particles) manufactured by Stream Chemicals Co., Ltd. were used. The average particle diameter of the magnesium oxide particles was 20 nm.

[0681] Particle dispersion liquid 400a was prepared in the same manner as the particle dispersion liquid 100a except that FINEX (registered trademark) -50 was used instead of FINEX (registered trademark) -30.

[0682] [Particle dispersion liquids 11Ab, 11Bb, 11Cb]

[0683] Particle dispersion liquid 11Ab was prepared in the same manner as the particle dispersion liquid 11Aa except that the dispersion treatment using the planetary ball mill was not performed and the mixed solution was stirred using the stirring blade for 10 minutes (described as "stirring only" in [Table 3]).

[0684] Particle dispersion liquid 11Bb was prepared in the same manner as the particle dispersion liquid 11Ab except that the amount of the dispersant added was 40 parts by mass.

[0685] Particle dispersion liquid 11Cb was prepared in the same manner as the particle dispersion liquid 11Ab except that the amount of the dispersant added was 20 parts by mass.

[0686] [Particle dispersion liquids 14Ab, 14Bb]

[0687] Particle dispersion liquid 14Ab was prepared in the same manner as the particle dispersion liquid 14Aa except that the dispersion treatment using the planetary ball mill was not performed and the mixed solution was stirred using the stirring blade for 10 minutes.

[0688] Particle dispersion liquid 14Bb was prepared in the same manner as the particle dispersion liquid 14Ab except that the amount of the dispersant added was 40 parts by mass.

[0689] [Particle dispersions 100b, 200b, 300b, 400b]

[0690] The particle dispersion 100b was prepared in the same manner as the particle dispersion 100a except that the dispersion treatment using a planetary ball mill was not performed and the mixed solution was stirred using a stirring blade for 10 minutes.

[0691] The particle dispersion 200b was prepared in the same manner as the particle dispersion 200a except that the dispersion treatment using a planetary ball mill was not performed and the mixed solution was stirred using a stirring blade for 10 minutes.

[0692] The particle dispersion 300b was prepared in the same manner as the particle dispersion 300a except that the dispersion treatment using a planetary ball mill was not performed and the mixed solution was stirred using a stirring blade for 10 minutes.

[0693] The particle dispersion 400b was prepared in the same manner as the particle dispersion 400a except that the dispersion treatment using a planetary ball mill was not performed and the mixed solution was stirred using a stirring blade for 10 minutes.

[0694] The manufacturing conditions and evaluation results of Examples 1 to 31 and Comparative Examples 1 to 20 are shown in the following [Table 4].

[0695] [Table 4]

[0696]

[0697] [Example 1]

[0698] In Example 1, as the resin layer 312, Toyobo Ester (registered trademark) Film E5100 (trade name; manufactured by Toyobo Co., Ltd.) which is biaxially stretched polyethylene terephthalate was used. The thickness of E5100 was 12 μm, the length was 500 m, and the width was 600 mm.

[0699] The one surface 312b of the resin layer 312 was subjected to corona treatment, and a barrier layer 314 formed of SiOx was formed on the surface 312b subjected to the corona treatment using a vacuum evaporation machine.

[0700] Specifically, an evaporation material in which metal silicon powder and silica powder were mixed was prepared, and the surface 312b was subjected to evaporation in such a manner that an evaporation layer in which the element ratio of O / Si was 1.5 (x = 1.5) was formed using a vacuum evaporation machine. The thickness of the barrier layer 314 was 50 nm.

[0701] Next, a two-component curable polyurethane adhesive A626 / A50 (trade name; manufactured by Mitsui Chemicals Co., Ltd.) is applied to the barrier layer 314 using a dry laminator, and a nylon film, Emblem (registered trademark) ON (trade name; manufactured by Unitika Co., Ltd.), is laminated to a thickness of 15 μm. This forms the adhesive layer 316 and the intermediate layer 318.

[0702] The coating liquid for forming the adhesive layer 320 is prepared using particle dispersion 11Aa as follows.

[0703] The two components, A626 and A50, used as a two-component curable polyurethane adhesive, were mixed at a mass ratio of 8:1 and diluted with ethyl acetate to form an adhesive with a solid content of 30% by mass. Then, a particle dispersion 11Aa was added to the adhesive, adjusting the ratio of the solid content of zinc oxide particles to the total mass of the adhesive and the solid content of the zinc oxide particles to 1.5% by mass.

[0704] For simplicity, the ratio of the solid content of polyvalent metal compound particles to the total mass of the solid content of the adhesive and the solid content of the polyvalent metal compound particles will be referred to as the "particle amount in the coating liquid". [Table 4] records it as "particle amount".

[0705] The mixture of binder and particle dispersion 11Aa was then stirred for 30 minutes using a stirring blade. The mixture was then filtered through a 3 μm pore size filter membrane to obtain the coating liquid 11Aa used in Example 1. In the dispersed particle dispersion 11Aa, since the zinc oxide particles are difficult to aggregate, most of the zinc oxide particles in the mixture permeated through the filter membrane.

[0706] Subsequently, a dry laminator coating liquid 11Aa is applied to the intermediate layer 318 as a sealant layer 330 to bond an 80μm thick polyolefin-based unstretched co-extruded film.

[0707] Thus, obtaining Figure 10 The laminated film 360 shown has a stacked structure. That is, the laminated film 360 sequentially comprises a sealant layer 330 formed from a polyolefin-based unstretched co-extruded film, an adhesive layer 320 containing zinc oxide particles, an intermediate layer 318 formed from a nylon film, an adhesive layer 316 without zinc oxide particles, a barrier layer 314, and a resin layer 312.

[0708] The amount of zinc oxide particles in adhesive layer 320 is 1.5% by mass, the same as the amount of particles in the coating liquid.

[0709] Next, the laminated film 360 of Example 1 is pasted together with the sealant layers 330 facing each other, to create a product as shown in the image.Figure 13 The packaging bag 400A of Example 1 of the three-edge sealed bag.

[0710] After that, the packaged article 410 is housed in the packaging bag 400A and sealed, and the packaging body 500A of Example 1 is manufactured.

[0711] As the packaged article 410, a cysteine aqueous solution containing 0.03 mass% of cysteine was used.

[0712] [Examples 2 to 22]

[0713] As shown in [Table 4], the laminated film 360, the packaging bag 400A, and the packaging body 500A were manufactured in the same manner as in Example 1 except that the coating liquid 11Aa was replaced with the coating liquid described in each column.

[0714] The particle amount of the zinc oxide particles in the coating liquid 11Aa was 1.5 mass%, the particle amount of the zinc oxide particles in the coating liquid 11Aa+ was 9.5 mass%, the particle amount of the zinc oxide particles in the coating liquid 11Aa- was 0.8 mass%, and the particle amount of the zinc oxide particles in the coating liquid 11Aa++ was 11 mass%.

[0715] The particle amount of the zinc oxide particles in the coating liquid 11Ca was 3.0 mass%, and the particle amount of the zinc oxide particles in the coating liquid 11Ca+ was 5.0 mass%.

[0716] The particle amount of the zinc oxide particles in the coating liquid 14Ca was 3.0 mass%, and the particle amount of the zinc oxide particles in the coating liquid 14Ca+ was 5.0 mass%.

[0717] The particle amount of the zinc oxide particles in the coating liquid 100a was 1.5 mass%, and the particle amount of the zinc oxide particles in the coating liquid 100a+ was 9.5 mass%.

[0718] [Example 23]

[0719] In Example 23, as the resin layer 312, Toyobo Ester (registered trademark) Film E5100 (trade name; manufactured by Toyobo Co., Ltd.) which is biaxially stretched polyethylene terephthalate was used. The thickness of E5100 was 12 μm, the length was 500 m, and the width was 600 mm.

[0720] On the resin layer 312, a two-component curable polyurethane-based adhesive A525 / A52 (trade name; manufactured by Mitsui Chemicals, Inc.) was coated using a dry laminator, and a nylon film Emblem (registered trademark) ON (trade name; manufactured by Unitika Ltd.) having a thickness of 15 μm was laminated as the intermediate layer 318. Thus, the adhesive layer 316 and the intermediate layer 318 were formed.

[0721] Next, an adhesive is applied again to the intermediate layer 318, and a 7μm thick aluminum film is laminated as the intermediate layer 318B. Thus, an adhesive layer 316B and an intermediate layer 318B are formed.

[0722] Using particle dispersion 11Aa, a coating liquid for forming adhesive layer 320 is prepared as follows.

[0723] The two components, A525 and A52, used as a two-component curable polyurethane adhesive, were mixed at a mass ratio of 8:1 and diluted with ethyl acetate to form an adhesive with a solid content of 30% by mass. Then, particle dispersion 11Aa was added to the adhesive, adjusting the ratio of the solid content of zinc oxide particles to the total mass of the adhesive and the solid content of the zinc oxide particles to 1.5% by mass.

[0724] For simplicity, the ratio of the solid content of polyvalent metal compound particles to the total mass of the solid content of the adhesive and the solid content of the polyvalent metal compound particles will be referred to as the "particle amount in the coating liquid". [Table 4] records it as "particle amount".

[0725] The mixture of binder and particle dispersion 11Aa was then stirred for 30 minutes using a stirring blade. The mixture was then filtered through a 3 μm pore size filter membrane to obtain the coating liquid 11Aa used in Example 19. In the dispersed particle dispersion 11Aa, since the zinc oxide particles are difficult to aggregate, most of the zinc oxide particles in the mixture permeated through the filter membrane.

[0726] Subsequently, a dry laminator coating liquid 11Aa is applied to the intermediate layer 318B as a sealant layer 330 to bond an 80μm thick polyolefin-based unstretched co-extruded film.

[0727] Thus, obtaining Figure 11 The laminated film 370 shown has a multilayer structure. Specifically, the multilayer film 370 sequentially comprises a sealant layer 330 formed from a polyolefin-based unstretched co-extruded film, an adhesive layer 320 containing zinc oxide particles, an intermediate layer 318B formed from aluminum foil, an adhesive layer 316B without zinc oxide particles, an intermediate layer 318 formed from a nylon film, an adhesive layer 316 without zinc oxide particles, and a resin layer 312.

[0728] The amount of zinc oxide particles in adhesive layer 320 is 1.5% by mass, the same as the amount of particles in the coating liquid.

[0729] Next, the laminated film 370 of Example 1 is pasted together with the sealant layers 330 facing each other, to create a product as shown in the image. Figure 13The packaging bag 400A of Example 1 of the three-seal bag.

[0730] After that, the contents 410 are housed in the packaging bag 400A and sealed to produce the packaging body 500A of Example 1.

[0731] As the contents 410, a cysteine aqueous solution containing 0.03 mass% of cysteine was used.

[0732] [Examples 24 to 31]

[0733] As shown in [Table 4], the laminated film 370, the packaging bag 400A, and the packaging body 500A were produced in the same manner as in Example 23 except that the coating liquid described in each column was used instead of the coating liquid 11Aa in Example 24 to 31.

[0734] [Comparative Examples 1 to 14]

[0735] In Comparative Example 1, the laminated film 360, the packaging bag 400A, and the packaging body 500A of Comparative Example 1 were produced in the same manner as in Example 1 except that the polyurethane-based adhesive was used alone to form the adhesive layer without using the multivalent metal particle and the multivalent metal compound particle.

[0736] In Comparative Example 2, the laminated film 360, the packaging bag 400A, and the packaging body 500A of Comparative Example 2 were produced in the same manner as in Example 9 except that the coating liquid 100bN (the particle amount of the zinc oxide particle was 1.5 mass%) was used instead of the coating liquid 100a. The coating liquid 100bN was formed in the same manner as the coating liquid 100a except that the particle dispersion liquid 100b was stirred for 30 minutes without filtering with the filter membrane.

[0737] In Comparative Examples 3 to 14, the stirring treatment was performed in the same manner as in Comparative Example 2 except that the coating liquid described in each column was used to produce the laminated film 360, the packaging bag 400A, and the packaging body 500A.

[0738] The particle amount of the zinc oxide particle in the coating liquid 100bN was 1.5 mass%, the particle amount of the zinc oxide particle in the coating liquid 100bP was 3.0 mass%, and the particle amount of the zinc oxide particle in the coating liquid 100b+ was 9.5 mass%.

[0739] The particle amount of the aluminum oxide particle in the coating liquid 200b was 1.5 mass%, and the particle amount of the aluminum oxide particle in the coating liquid 200b+ was 9.5 mass%.

[0740] The particle amount of the magnesium oxide particle in the coating liquid 300b was 1.5 mass%, and the particle amount of the magnesium oxide particle in the coating liquid 300b+ was 9.5 mass%.

[0741] [Comparative Examples 15 to 20]

[0742] In Comparative Example 15, the laminated film 370, the packaging bag 400A, and the packaging body 500A of Comparative Example 16 were produced in the same manner as in Example 23, except that the coating liquid 11Ab (the particle amount of the zinc oxide particles was 1.5 mass%) was used instead of the coating liquid 11Aa. The coating liquid 11Ab was formed in the same manner as the coating liquid 11Aa, except that the filtration with the filter membrane was not performed after the adhesive and the particle dispersion liquid 11Ab were stirred for 30 minutes.

[0743] In Comparative Examples 16 to 20, the stirring treatment was performed in the same manner as in Example 23, except that the coating liquid described in each column was used, respectively, to produce the laminated film 370, the packaging bag 400A, and the packaging body 500A.

[0744] [Method of Evaluation]

[0745] In order to evaluate each of the examples and the comparative examples, the OM image result, the hydrogen sulfide (H2S) concentration, and the lamination strength were measured.

[0746] The OM image observation result is observation of the adhesive layer containing the particles of the polyvalent metal compound from the resin layer side using an optical microscope.

[0747] The magnification of the optical microscope was 500 times, and the agglomerates within a range of 500 pm x 500 pm were observed. The number of agglomerates within a range of 500 pm x 500 pm of 9 pm or more was described in the column of "agglomerate number" of [Table 4]. The distance between the agglomerates was described in the column of "distance between agglomerates" of [Table 4]. The distance between the agglomerates was the average value of the distances of 10 arbitrary agglomerates.

[0748] Further, when the particles containing aluminum are contained in the adhesive layer or the barrier layer, or the like, the cross section of the laminated film can also be dissolved and removed using an alkali solution, and then optical observation can be performed.

[0749] In the measurement of the hydrogen sulfide concentration, the packaging body in which the aqueous solution of cysteine in each of the examples and the comparative examples was housed was used as a test sample.

[0750] Each of the packaging bodies of the test samples was subjected to high-temperature cooking treatment at 120°C for 60 minutes. After the high-temperature cooking treatment, the packaging bodies were stored in a refrigerator for 1 week. The aqueous solution in each of the packaging bodies after the collection was subjected to the measurement of the hydrogen sulfide concentration using the methylene blue method (wavelength: 668 nm). In the calculation of the hydrogen sulfide concentration, a standard curve prepared in advance was used. The measurement results of the hydrogen sulfide concentration are shown in [Table 4].

[0751] As the test sample for the measurement of the lamination strength, the packaging bag corresponding to the packaging bag before the high-temperature cooking treatment and the packaging bag after the high-temperature cooking treatment in each of the examples and the comparative examples were used.

[0752] The packaging bag corresponding to the one before the high-temperature retort treatment was aged at 45°C for 4 days. Thereafter, the lamination strength between the nylon layer and the sealant layer was measured in accordance with JIS Z0238:1998. Specifically, a universal tensile material tester (trade name; manufactured by A&D Company, Ltd.) was used to measure the lamination strength of each test sample by the T-peeling method (crosshead speed: 300 mm / min). The measurement results are shown in the column of "lamination strength before treatment" in [Table 4].

[0753] The test sample of the packaging bag after the high-temperature retort treatment was measured for the lamination strength (N / 15 mm width) in the same manner as the packaging bag corresponding to the one before the high-temperature retort treatment. The measurement results are shown in the column of "lamination strength after treatment" in [Table 4]. In [Table 4], (N / 15 mm width) is expressed as (N).

[0754] [Results of Evaluation]

[0755] As shown in [Table 4], in the laminated films of Examples 1 to 31, the number of agglomerates of 9 μm or more in the agglomerates formed of the polyvalent metal particles or the polyvalent metal compound particles in the range of 500 μm x 500 μm of the adhesive layer 320 was 6 or more and 23 or less, the hydrogen sulfide concentration was 0.2 mg / L or less. In addition, the distance between the agglomerates was 103 μm or more and 200 μm or less.

[0756] In addition, in the laminated films of Examples 1 to 31, the lamination strength after the high-temperature retort treatment was 6 N / 15 mm width or more.

[0757] In Examples 1 to 31, the number of agglomerates was 6 to 23. In Comparative Examples 2 to 20, the number of agglomerates was 80 to 156. In Comparative Examples 1 to 20, both the results of the adsorption effect of the high-temperature retort odor and the lamination strength after the high-temperature retort treatment were poor, and thus it was found that the number of agglomerates of 30 or less can improve the adsorption effect of the high-temperature retort odor and the lamination strength after the high-temperature retort treatment is good.

[0758] Comparative Example 1 and Example 4, the distance between the aggregates in Example 4 was 179 μm when the dispersant was 40 parts by mass, and the distance between the aggregates in Example 1 was 133 μm when the dispersant was 5 parts by mass. Comparative Example 5 and Example 6, the distance between the aggregates in Example 6 was 163 μm when the dispersant was 40 parts by mass, and the distance between the aggregates in Example 5 was 126 μm when the dispersant was 5 parts by mass. Comparative Example 7 and Example 8, the distance between the aggregates in Example 8 was 163 μm when the dispersant was 40 parts by mass, and the distance between the aggregates in Example 7 was 126 μm when the dispersant was 5 parts by mass. Comparative Example 12 and Example 15, the distance between the aggregates in Example 15 was 200 μm when the dispersant was 40 parts by mass, and the distance between the aggregates in Example 12 was 141 μm when the dispersant was 5 parts by mass.

[0759] That is, it is known that when the amount of dispersant is large, the distance between the aggregates is reduced, and the dispersibility of the additive particles (multivalent metal particles or multivalent metal compound particles) in the binder component is improved.

[0760] In Examples 1 to 31, the distance between the aggregates was 103 to 200 μm. In Comparative Examples 2 to 20, the distance between the aggregates was 40 to 56 μm. In Comparative Examples 1 to 20, both the adsorption effect of the odor of high-temperature cooking and the laminate strength after the high-temperature cooking treatment were poor, and thus it is known that when the distance between the aggregates is 100 μm or more, the adsorption effect of the odor of high-temperature cooking is improved and the laminate strength after the high-temperature cooking treatment is good.

[0761] Comparative Example 1 and Example 4, the distance between the aggregates in Example 4 was 179 μm when the dispersant was 40 parts by mass, and the distance between the aggregates in Example 1 was 133 μm when the dispersant was 5 parts by mass. Comparative Example 5 and Example 6, the distance between the aggregates in Example 6 was 163 μm when the dispersant was 40 parts by mass, and the distance between the aggregates in Example 5 was 126 μm when the dispersant was 5 parts by mass. Comparative Example 7 and Example 8, the distance between the aggregates in Example 8 was 163 μm when the dispersant was 40 parts by mass, and the distance between the aggregates in Example 7 was 126 μm when the dispersant was 5 parts by mass. Comparative Example 12 and Example 15, the distance between the aggregates in Example 15 was 200 μm when the dispersant was 40 parts by mass, and the distance between the aggregates in Example 12 was 141 μm when the dispersant was 5 parts by mass.

[0762] That is, it is known that when the amount of dispersant is large, the distance between the aggregates is reduced, and the dispersibility of the additive particles (multivalent metal particles or multivalent metal compound particles) in the binder component is improved.

[0763] Comparing Comparative Example 1 and Examples 19 and 20, the hydrogen sulfide concentration in Example 20 having a particle amount of 11 mass% was 0.01 mg / L, the hydrogen sulfide concentration in Example 1 having a particle amount of 1.5 mass% was 0.03 mg / L, and the hydrogen sulfide concentration in Example 19 having a particle amount of 0.8 mass% was 0.2 mg / L. Comparing Comparative Example 2 and Example 3, the hydrogen sulfide concentration in Example 3 having a particle amount of 5.0 mass% was 0.01 mg / L, and the hydrogen sulfide concentration in Example 2 having a particle amount of 3.0 mass% was 0.02 mg / L. Comparing Comparative Example 9 and Example 11, the hydrogen sulfide concentration in Example 11 having a particle amount of 9.5 mass% was 0.01 mg / L, and the hydrogen sulfide concentration in Example 9 having a particle amount of 1.5 mass% was 0.03 mg / L. Comparing Comparative Example 13 and Example 14, the hydrogen sulfide concentration in Example 14 having a particle amount of 5.0 mass% was 0.01 mg / L, and the hydrogen sulfide concentration in Example 13 having a particle amount of 3.0 mass% was 0.02 mg / L.

[0764] That is, when the particle amount of the additive particles is large, the adsorption effect on the high-temperature cooking odor is high.

[0765] When the particle amount is 0.5 mass% or more, the adsorption effect on the high-temperature cooking odor is sufficient, but it is considered preferable that the particle amount be 1.0 mass% or more.

[0766] Comparing Comparative Example 1 and Example 20, the laminate strength after the high-temperature cooking treatment in Example 1 having a particle amount of 1.5 mass% was 8 N / 15 mm width, and the laminate strength after the high-temperature cooking treatment in Example 20 having a particle amount of 11 mass% was 6 N / 15 mm width.

[0767] That is, when the particle amount of the additive particles is large, the adsorption effect on the high-temperature cooking odor is high, but when the particle amount of the additive particles exceeds 10 mass%, the laminate strength decreases, and thus it is considered preferable that the particle amount of the additive particles be 10 mass% or less.

[0768] Comparing Comparative Example 12 and Example 21, the hydrogen sulfide concentration in Example 12 having a primary particle of the additive particles having an average particle diameter of 20 nm was 0.03 mg / L, and the hydrogen sulfide concentration in Example 21 having a primary particle of the additive particles having an average particle diameter of 60 nm was 0.06 mg / L. Comparing Comparative Example 15 and Example 22, the hydrogen sulfide concentration in Example 15 having a primary particle of the additive particles having an average particle diameter of 20 nm was 0.03 mg / L, and the hydrogen sulfide concentration in Example 22 having a primary particle of the additive particles having an average particle diameter of 60 nm was 0.06 mg / L.

[0769] That is, it is also possible that the average particle diameter of the primary particles of the additive particles is 60 nm, but since the adsorption effect of the high-temperature cooking odor is somewhat poor when the average particle diameter is too large, it is considered that the average particle diameter is preferably 45 nm or less.

[0770] The difference between Example 1 and Example 23, between Example 4 and Example 24, between Example 11 and Example 25, between Example 10 and Example 26, between Example 12 and Example 27, between Example 15 and Example 28, between Example 16 and Example 29, between Example 16 and Example 30, and between Example 20 and Example 31 is that the aluminum film sheet was not put in the intermediate layer in the former, but was put in the intermediate layer in the latter. The results were the same in terms of the adsorption effect of the high-temperature cooking odor and the laminate strength after the high-temperature cooking treatment, regardless of the presence or absence of the aluminum film sheet.

[0771] Figure 15 Examples of images observed for the OM image of Comparative Example 3. In Comparative Example 3, as shown in Figure 15 , 9.6 μm, 10.3 μm, and 11.3 μm are shown as the aggregate P.

[0772] [Overall Evaluation]

[0773] Regarding the high-temperature cooking odor (described as "odor" in [Table 4]), it was determined to be good (described as "A" in [Table 4]) when the hydrogen sulfide concentration was 0.04 mg / L or less, to be somewhat good (described as "B" in [Table 4]) when the hydrogen sulfide concentration was more than 0.04 mg / L and 0.25 mg / L or less, and to be poor (described as "C" in [Table 4]) when the hydrogen sulfide concentration was more than 0.25 mg / L.

[0774] Regarding the laminate strength (described as "strength" in [Table 4]), it was determined to be good (described as "A" in [Table 4]) when the laminate strength after the high-temperature cooking treatment was 7 N / 15 mm width or more, to be somewhat good (described as "B" in [Table 4]) when the laminate strength after the high-temperature cooking treatment was 6 N / 15 mm width or more and less than 7 N / 15 mm width, and to be poor (described as "C" in [Table 4]) when the laminate strength after the high-temperature cooking treatment was less than 6 N / 15 mm width.

[0775] As a comprehensive evaluation, when both of the evaluations of the high-temperature cooking odor and the laminate strength were good (indicated as "A" in [Table 4]), it was determined to be good (indicated as "A" in [Table 4]). When either of the evaluations of the high-temperature cooking odor and the laminate strength was good (indicated as "A" in [Table 4]) and the other was slightly good (indicated as "B" in [Table 4]), it was determined to be slightly good (indicated as "B" in [Table 4]). When both of the evaluations of the high-temperature cooking odor and the laminate strength were slightly good (indicated as "B" in [Table 4]), or either of the evaluations of the high-temperature cooking odor and the laminate strength was poor (indicated as "C" in [Table 4]), it was determined to be poor (indicated as "C" in [Table 4]).

[0776] As shown in [Table 4], the comprehensive evaluations of Examples 1 to 18 and 23 to 29 were A. The comprehensive evaluations of Examples 19 to 22, 30, and 31 were B.

[0777] Comparative Example 1 had a comprehensive evaluation of C because the evaluation of the odor was C.

[0778] Comparative Examples 2 to 8 and 12 to 20 had a comprehensive evaluation of C because the evaluations of the high-temperature cooking odor and the strength were B.

[0779] Comparative Examples 9 to 11 had a comprehensive evaluation of C because the evaluation of the strength was C.

[0780] Hereinafter, embodiments of the present application will be described with reference to the drawings. In all the drawings, even when the embodiments are different, the same or equivalent components are denoted by the same symbols, and common descriptions are omitted. There are cases in which the same or equivalent components are denoted by different symbols even when they are the same as or equivalent to the above-described embodiments. In addition, positional relationships such as up and down, left and right, and the like are based on the positional relationships shown in the drawings unless otherwise specified.

[0781] Hereinafter, when a plurality of preferable numerical ranges are exemplified under a specific numerical range, combinations of upper limit values and lower limit values are not limited to the exemplified combinations as long as they are included in the preferable maximum numerical range if not particularly limited. For example, when "x1 or more and x4 or less" and "x2 or more and x3 or less" are exemplified as preferable ranges of a quantity X with x1 < x2 < x3 < x4, each numerical range such as "more than x1 and less than x4", "x2 or more and x4 or less", "x3 or more and x4 or less", and the like is also a preferable range.

[0782] [Eleventh Embodiment]

[0783] A laminated film of the eleventh embodiment of the present application will be described.

[0784] Figure 16 A schematic cross-sectional view showing an example of the laminated film of the eleventh embodiment of the present application.

[0785] Figure 16 The laminated film 50 of the present embodiment shown in the drawing has a base film 610, an adhesive layer 620, and a sealant layer 630. The base film 610, the adhesive layer 620, and the sealant layer 630 in the laminated film 50 are sequentially laminated. The base film 610, the adhesive layer 620, and the sealant layer 630 each have a light-transmitting property of transmitting visible light. Therefore, the laminated film 50 has a light-transmitting portion in which visible light is transmitted in the thickness direction (the upward and downward direction in the drawing). The light-transmitting portion in the laminated film 50 can be provided in at least a part thereof. Figure 16 In the example shown in the drawing, the light-transmitting portion is the entire laminated film 50.

[0786] The haze of the light-transmitting portion of the laminated film 50 is 30% or less, and more preferably 25% or less, as measured according to the haze measurement method prescribed in JIS-K-7136. Hereinafter, the haze prescribed in JIS-K-7136 is simply referred to as "haze".

[0787] The base film 610 has a resin layer 612 and a barrier layer 614.

[0788] The resin layer 612 is composed of, for example, a resin film.

[0789] As the resin film, for example, a polyester film formed of polyethylene terephthalate (PET), polyethylene naphthalate (PEN), or the like; a polyolefin film formed of polyethylene, polypropylene, or the like; a polystyrene film; a polyamide film formed of 66-nylon or the like; a polycarbonate film; an acrylonitrile film; a polyimide film; and an engineering plastic film formed of an engineering plastic, or the like can be given.

[0790] The resin film constituting the resin layer 612 can be used alone, or two or more kinds thereof can be used in combination.

[0791] For example, the resin layer 612 can be composed by laminating a plurality of the same resin film.

[0792] The resin film can be either a stretched film or an unstretched film. The resin film can also be a multilayer film in which at least one stretched film and at least one unstretched film are laminated.

[0793] The resin layer 612 can also have a film that is arbitrarily stretched in a biaxial direction. In this case, the mechanical strength and the dimensional stability can be improved.

[0794] The resin layer 612, particularly from the viewpoint of balancing strength and flexibility, is more preferably composed of one or both of a polyester film and a biaxially stretched polypropylene film.

[0795] The resin layer 612, particularly from the viewpoint of improving strength and reducing cost, is more preferably composed of one or both of a polypropylene film and a polyethylene terephthalate film.

[0796] The resin layer 612 is more preferably a nylon film from the viewpoint of improving strength, in particular. A nylon film is excellent in flexibility, and thus it is difficult to cause a pinhole. Therefore, when a packaging body is formed using the packaging bag using the laminate film 650, it is possible to suppress the occurrence of a pinhole in the laminate film 650 to cause deterioration of the packaged product. This effect is particularly useful when the packaged product is a food product.

[0797] The thickness of the resin layer 612 can be a thickness corresponding to the use or the desired properties, and is not particularly limited. The thickness of the resin layer 612 can be, for example, 3 μm or more and 100 μm or less, more preferably 6 μm or more and 50 μm or less.

[0798] If the haze of the light-transmitting portion of the laminate film 650 can be 30% or less, more preferably 25% or less, the resin layer 612 can further contain an appropriate additive. As the additive, at least one selected from the group consisting of a filler, an antistatic agent, a plasticizer, a lubricant, and an antioxidant, and the like can be cited.

[0799] The surface 612a of the resin layer 612 is a surface that forms the outer surface of the laminate film 650 when the packaging bag is formed.

[0800] The surface 612b of the resin layer 612 is a surface on the side opposite to the surface 612a in the thickness direction, and is a bonding surface with the barrier layer 614 described later.

[0801] If the haze of the light-transmitting portion of the laminate film 650 can be 30% or less, the laminate film 650 can be further subjected to an appropriate surface treatment. For example, the surface 612b can be subjected to an appropriate surface treatment for improving the adhesion of the barrier layer 614. As examples of the surface treatment, at least one selected from the group consisting of a chemical agent treatment, a solvent treatment, a corona treatment, a plasma treatment, and an ozone treatment can be cited.

[0802] The barrier layer 614 is a layer having at least a barrier property against oxygen and water vapor. The barrier layer 614 is laminated on the surface 612b of the resin layer 612.

[0803] The number of layers of the barrier layer 614 is not particularly limited as long as it contains at least one layer having a barrier property.

[0804] For example, as an example in which the barrier layer 614 is formed of a single layer, an evaporation layer formed of an inorganic substance, a barrier film formed of a resin having a barrier property, and the like can be cited.

[0805] For example, as an example in which the barrier layer 614 is composed of a plurality of layers, a barrier film formed by applying an inorganic substance having a barrier property on the surface of a resin film or the like can be cited.

[0806] As the inorganic substance that can be used in the barrier layer 614, silicon dioxide, aluminum, silicon, and the like can be given. Such an inorganic substance, when the barrier layer 614 is formed in a single layer, can be vapor-deposited on the surface of the resin layer 612.

[0807] As the barrier film that can be used in the barrier layer 614, a nylon-based barrier film, an ethylene-vinyl alcohol-based barrier film, and the like can be given. Such a barrier film, when the barrier layer 614 is formed in a single layer, can be laminated on the resin layer 612 by extrusion lamination, dry lamination, wet lamination, or the like.

[0808] For example, when a barrier film coated with an inorganic substance is used as the barrier layer 614, as the inorganic substance, silicon dioxide, aluminum, silicon, and the like can be used. At this time, the barrier film can be laminated on the resin layer 612 by dry lamination or the like.

[0809] The barrier layer 614 can be used alone by one of the above examples, or two or more can be used in combination.

[0810] The layer thickness of the barrier layer 614 is not particularly limited. For example, when the barrier layer 614 is formed by a vapor-deposited layer, the layer thickness can be 5 nm or more and 100 nm or less.

[0811] The barrier layer 614 can be formed, for example, by a vacuum vapor deposition method, a sputtering method, an ion plating method, a plasma vapor deposition method (CVD), a dry lamination method, an extrusion lamination method, or the like.

[0812] The adhesive layer 620 is a layer that adheres the barrier layer 614 to a sealant layer 30 described later.

[0813] The adhesive layer 620 contains an adhesive component and a multivalent metal particle or a multivalent metal compound particle mixed in the adhesive component.

[0814] As the adhesive component, for example, a cured product of a urethane-based adhesive, a polyester-based adhesive, a polyamide-based adhesive, an epoxy-based adhesive, an isocyanate-based adhesive, and the like can be given.

[0815] The adhesive component in the adhesive layer 620 is more preferably formed of a two-component curable adhesive from the viewpoint of easily suppressing deterioration of the multivalent metal particle or the multivalent metal compound particle described later.

[0816] Such a deterioration suppression effect has a tendency to be more significantly exhibited when a two-component curable urethane-based adhesive is used. Therefore, in the two-component curable adhesive, it is particularly preferable to use a urethane-based adhesive.

[0817] The multivalent metal particle is a particle formed of a metal that generates a multivalent ion (hereinafter referred to as a multivalent metal). The multivalent metal compound particle is a particle formed of a compound of a multivalent metal.

[0818] The purpose of using the multivalent metal particles or the multivalent metal compound particles is to capture substances (hereinafter sometimes referred to as odor origin substances) such as sulfur compounds and the like, which cause high-temperature cooking odor, in the adhesive layer 620. As the sulfur compounds which are the odor origin substances, hydrogen sulfide, mercaptans, sulfur dioxide, sulfur trioxide and the like can be given.

[0819] The principle by which the odor origin substances can be captured by the multivalent metal particles and the multivalent metal compound particles is not clear in theory, but it can be determined by experiments that they are effective for reducing the odor origin substances.

[0820] The multivalent metal particles and the multivalent metal compound particles mixed in the adhesive layer 620 have a capturing effect of the compounds which cause high-temperature cooking odor, and there is no particular limitation as long as they are stably present inside the adhesive component of the adhesive layer 620.

[0821] As the multivalent metal particles, for example, particles of alkaline earth metals such as beryllium, magnesium, calcium and the like; particles of transition metals such as titanium, zirconium, chromium, manganese, iron, cobalt, nickel, copper, zinc and the like; and particles of aluminum and the like can be used.

[0822] The multivalent metal particles can be formed with an oxide coating film on the surface or can be surface-coated in a manner that they are easily stably present inside the adhesive layer 620.

[0823] As the multivalent metal compound particles, for example, particles of oxides, hydroxides, carbonates, organic acid salts (for example, acetates), inorganic acid salts and the like of multivalent metals can be given. As the multivalent metal compound particles, for example, particles of ammonium complexes of multivalent metal oxides, secondary amine to quaternary ammonium complexes of multivalent metal oxides, or carbonates or organic acid salts of the same can also be used.

[0824] From the viewpoint of being more stably present inside the adhesive layer 620, it is more preferable to use the multivalent metal compound particles.

[0825] As the multivalent metal compound particles, from the viewpoint of stability in the adhesive component and ease of manufacture, it is more preferable to use particles of zinc compounds, aluminum compounds, magnesium compounds and the like. From the viewpoint of ease of handling and cost, as the multivalent metal compound particles, it is particularly preferable to use particles of zinc oxide, aluminum oxide, magnesium oxide and the like.

[0826] Hereinafter, for simplicity, the multivalent metal particles or the multivalent metal compound particles mixed in the adhesive component will sometimes be referred to as "additive particles".

[0827] In the adhesive layer 620, one or two or more kinds of the additive particles mixed in the adhesive component can be used.

[0828] The content of the additive particles in the adhesive layer 620 is not particularly limited as long as the haze of the light-transmissive portion in the laminated film 650 is 30% or less, more preferably 25% or less.

[0829] The more the content of the additive particles, the more the amount of the odor origin substance captured increases, and thus the high-temperature cooking odor is more easily suppressed. On the other hand, when the content of the additive particles increases, there is a possibility that the laminate strength of the adhesive layer 620 easily decreases or the transparency of the laminated film 650 decreases.

[0830] For example, from the viewpoint of the transparency of the laminated film, the content of the additive particles in the adhesive layer 620 is preferably 0.5% by mass or more and 10% by mass or less.

[0831] In addition, from the viewpoint of easily balancing the laminate strength of the adhesive layer 620 and the transparency of the laminated film and the reduction effect of the high-temperature cooking odor, the content of the additive particles in the adhesive layer 620 is more preferably 1% by mass or more and 10% by mass or less, and further preferably 1.5% by mass or more and 5% by mass or less.

[0832] When the content of the additive particles is less than 1% by mass, there is a possibility that the suppression effect of the high-temperature cooking odor becomes too low.

[0833] When the content of the additive particles exceeds 10% by mass, there is a possibility that the laminate strength of the adhesive layer 620 becomes too low or the transparency of the laminated film becomes too low.

[0834] The distribution of the additive particles in the adhesive layer 620 is more preferably less biased. For example, when the distribution of the additive particles is concentrated in a particular portion due to aggregation or the like, the transparency in the laminated film 650 easily becomes uneven. The distribution of the additive particles in the adhesive layer 620 also becomes a cause of increasing the haze or decreasing the laminate strength.

[0835] In particular, in the adhesive layer 620, when a large aggregate of the additive particles is formed, it easily becomes conspicuous as a granular unevenness. In particular, when the granular unevenness is arranged adjacent to each other, it easily becomes more conspicuous as a striped unevenness. For example, when the laminated film 650 is used in a packaging bag, and the contents of the packaging bag are visible from the outside through the light-transmissive portion, it is preferable that the granular unevenness or the striped unevenness is not visible.

[0836] For example, from the viewpoint of improving the transparency of the light-transmissive portion of the laminated film 650 and the laminate strength of the adhesive layer 620, the maximum diameter of the aggregate formed by the additive particles observed in a direction orthogonal to the thickness direction of the adhesive layer 620 is more preferably 1.0 μm or less, and further preferably 500 nm or less.

[0837] Here, the "agglomerate" is used in a broad sense and refers to an "lump" in appearance when observed using a microscope or the like in a direction orthogonal to the thickness direction. The "lump" in appearance is formed due to an agglomeration phenomenon of the additive particles, or is seen as a lump due to a high distribution density when observed in a direction orthogonal to the thickness direction from a certain region, and is not particularly distinguished.

[0838] For example, the maximum diameter of the agglomerate can be measured using a scanning electron microscope (cross-sectional SEM). Specifically, when a 50 μm rectangular region is photographed in the width direction with a magnification of 10,000 times for the cross-sectional SEM, the maximum diameter of the observed agglomerate is determined.

[0839] The measurement positions of the agglomerate size can be 500 m intervals in the winding direction (length direction) of the laminated film 650 and 200 mm intervals in the width direction. For example, if the laminated film has a length of 3,000 m and a width of 600 mm, 21 points can be measured, which are 6 points every 500 m in the length direction, the center in the width direction, and 3 points at a distance of 200 mm from the center.

[0840] However, when the maximum diameter of the agglomerate is measured in a packaging bag using the laminated film 650, the measurement can be performed at appropriate positions within the light-transmitting portion of the packaging bag.

[0841] The distribution of the agglomerates of the additive particles is preferably such that the number of agglomerates present within 10% or more and 200% or less of the average particle diameter in a 50 μm rectangular region in the width direction is 50 or more. At this time, the stripe unevenness becomes invisible, and the visibility of the packaged product can be improved when the laminated film 650 is used as a packaging bag.

[0842] For example, it is considered that the additive particles capture the odor source substances by adsorbing and permeating into the adhesive layer 620.

[0843] In order for the additive particles to efficiently capture the odor source substances, the specific surface area of the additive particles is more preferably larger. Here, the specific surface area indicates the surface area per unit mass of the additive particles. For example, the specific surface area of the additive particles can be 1 m 2 / g or more, and more preferably 5 m 2 / g or more.

[0844] When the specific surface area is increased, the particle diameter of the additive particles becomes too small, and for example, becomes easily scattered into the environment, and thus attention is required at the time of handling. From the viewpoint of making the handling of the additive particles easy in the manufacturing process, the specific surface area of the additive particles can be 100 m 2 / g or less, and more preferably 50 m 2 / g.

[0845] When the average particle diameter of the primary particles of the additive particles is too large, since it is easy to form agglomerates exceeding 1.0 μm, it is more preferable that the average particle diameter of the additive particles be small. However, when the average particle diameter of the additive particles is small to some extent, the maximum diameter of the agglomerates varies depending on the mixing method in the manufacturing process, and the correlation between the size of the average particle diameter and the maximum diameter of the agglomerates weakens.

[0846] Hereinafter, the average particle diameter of the primary particles of the additive particles will be simply expressed as the average particle diameter of the additive particles unless otherwise specified. The average particle diameter is the area equivalent circle diameter obtained from an image of a powder magnified 500,000 to 2,000,000 times using a transmission electron microscope (TEM), and is calculated from the following general formula. Formula: Average particle diameter = Sum of area equivalent circle diameters of measured particles / Number of measured particles (the number of measured particles is at least 100 or more).

[0847] The average particle diameter of the additive particles is not particularly limited as long as the haze is 30% or less, more preferably 25% or less, and can be, for example, 10 nm or more and 50 nm or less, more preferably 20 nm or more and 45 nm or less.

[0848] For example, when the average particle diameter of the additive particles is less than 10 nm, there is a possibility that the manufacturing cost increases or the handling in the manufacturing process becomes difficult.

[0849] For example, when the average particle diameter of the additive particles exceeds 50 nm, since the specific surface area decreases, there is a possibility that the capturing effect of the odor origin substance decreases.

[0850] In order to reduce the size of the agglomerates of the additive particles in the binder component, 1 part by mass or more and 50 parts by mass or less of a dispersant with respect to 100 parts by mass of the additive particles can also be contained in the adhesive layer 620.

[0851] The kind of the dispersant is not particularly limited as long as it is capable of dispersing the additive particles in the liquid binder component used for forming the binder component.

[0852] As the dispersing agent, for example, (poly)ester salts, polyether phosphates, alkyl sulfate salts, alkylbenzenesulfonic acid salts, alkylnaphthalenesulfonic acid salts, alkylsulfosuccinic acid salts, alkyl diphenyl ether disulfonic acid salts, alkyl phosphates, aromatic phosphates, polyoxyethylene alkyl ethers, polyoxyethylene alkylphenol ethers, polyoxyethylene alkyl esters, alkylallyl sulfate salts, polyoxyethylene alkyl phosphates, sorbitan alkyl esters, glycerin fatty acid esters, sorbitan fatty acid esters, sucrose fatty acid esters, polyethylene glycol fatty acid esters, polyoxyethylene sorbitan alkyl esters, polyoxyethylene alkylallyl ethers, polyoxyethylene derivatives, polyoxyethylene sorbitol fatty acid esters, polyoxy fatty acid esters, polyoxyethylene alkylamines, vinyl chloride-vinyl acetate copolymers, and the like can be given. These dispersing agents can be used alone, and two or more kinds thereof can be used in combination.

[0853] The laminating strength of the adhesive layer 620 is measured according to JIS Z 0238:1998 using a tensile testing machine by the T-type peeling method (crosshead speed: 300 mm / min).

[0854] The laminating strength of the adhesive layer 620 is preferably, for example, 7 N / 15 mm width or more after high-temperature retort.

[0855] The thickness of the adhesive layer 620 is not particularly limited as long as the laminating strength is good when the laminate film 650 is formed into a packaging bag and the reduction effect of the odor-causing substance is good.

[0856] The thickness of the adhesive layer 620 can be, for example, 0.01 μm or more and 5 μm or less, and more preferably 0.03 μm or more and 3 μm or less.

[0857] When the thickness of the adhesive layer 620 is less than 0.01 μm, there is a possibility that the laminating strength is reduced and the amount of captured odor-causing substance is too small.

[0858] When the thickness of the adhesive layer 620 exceeds 5 μm, there is a possibility that the laminate film 650 becomes too thick.

[0859] The sealant layer 630 is a layer for adhering the laminate film 650 to another laminate film by heat fusion. The sealant layer 630 is not particularly limited as long as it is fused by heat and fusion-bonded to the sealant layer of another laminate film.

[0860] As the material of the sealant layer 630, for example, resins such as low-density polyethylene, medium-density polyethylene, high-density polyethylene, linear (thread-like) low-density polyethylene, polypropylene, ethylene-vinyl acetate copolymer, ionomer resin, ethylene-acrylic acid copolymer, ethylene-methyl acrylate copolymer, ethylene-methacrylic acid copolymer, and ethylene-propylene copolymer can be given. The resin used in the sealant layer 630 can be any one of the resins exemplified alone, and two or more kinds thereof can be used in combination.

[0861] For example, when a packaging body subjected to boiling sterilization or high-temperature retort sterilization is formed by the lamination of the film 650, from the viewpoint of maintaining sufficient adhesiveness, a polypropylene resin that does not stretch is more preferably contained as the sealant layer 630.

[0862] The sealant layer 630 can be formed by extruding a resin composition onto the adhesive layer 20 while laminating the resin composition, or a film after the film has been cut into a sheet can be attached to the adhesive layer 620.

[0863] The thickness of the sealant layer 630 can be, for example, 10 μm or more and 150 μm or less, and is more preferably 30 μm or more and 80 μm or less.

[0864] Next, an example of a method for manufacturing the laminated film 650 will be described.

[0865] First, a base film 610 in which a barrier layer 614 is laminated on a resin film in which a resin layer 612 is formed is prepared.

[0866] Subsequently, the adhesive layer 620 and the sealant layer 630 are sequentially laminated on the barrier layer 614 of the base film 610.

[0867] As the lamination method, for example, dry lamination can be used.

[0868] For example, a coating liquid in which additive particles are mixed in an adhesive that forms the adhesive layer 620 after curing is prepared, the coating liquid is coated on the surface of the barrier layer 614 of the base film 610 and dried by a dry lamination machine, and the resin film in which the sealant layer 630 is formed is heat-pressed to the base film 610 using a hot roller.

[0869] The coating method of the coating liquid is not particularly limited. For example, the coating liquid can be coated using a coating machine such as a roll coater, a reverse roll coater, a gravure coater, a microgravure coater, a blade coater, a bar coater, a wire bar coater, a die coater, a dip coater, or a spin coater.

[0870] Further, as the lamination method, a solventless laminator can be used, and a coating liquid in which additive particles are mixed in an adhesive component of the adhesive layer 620 can also be used.

[0871] When the coating liquid is prepared, it is more preferable that the additive particles are mixed in an adhesive that forms the adhesive component, and the additive particles are dispersed in the coating liquid so that the size of the aggregates of the additive particles is 1.0 μm or less.

[0872] To reduce the size of the aggregates of the additive particles, it is more preferable to add a dispersant to the coating liquid. The dispersant can be directly added to the adhesive together with the additive particles, but it is more preferable to prepare the coating liquid by mixing the particle dispersion liquid in which the additive particles and the dispersant are dispersed in the solvent, for example, at 30% by volume, and the adhesive. At this time, the dispersion of the additive particles in the coating liquid can be facilitated.

[0873] The additive particles are more preferably subjected to a mechanical treatment for refining the additive particles in a state in which the additive particles, the dispersant, and the solvent are mixed. By this, the refinement and dispersion of the additive particles in the coating liquid can be facilitated.

[0874] As the mechanical treatment for refining, a high-pressure homogenizer, an ultrahigh-pressure homogenizer, a bead mill, a roll mill, a chopper, a planetary mill, a jet mill, a mortar, a grinder, a juicer mixer, a homogenizer, an ultrasonic homogenizer, a micro jet high-pressure homogenizer, underwater opposed jets, and the like can be given, and a bead mill in which the additive particles and the dispersant are dispersed in a solvent and beads are mixed to disperse the additive particles by the energy of the centrifugal force generated by high-speed rotation of the beads is particularly preferable.

[0875] By using one or more of the above-described means (a bead mill in the present embodiment) to perform a dispersion treatment in which the refined additive particles are dispersed in the coating liquid, the growth of the aggregates in the coating liquid can be suppressed.

[0876] By performing the dispersion treatment, the generation of the precipitates in the coating liquid can also be suppressed, and thus the additive particles can be efficiently dispersed in the coating liquid.

[0877] By efficiently dispersing the additive particles in the coating liquid to suppress the growth of the aggregates in the coating liquid, the increase in the haze can be suppressed. The ratio of the haze when the additive particles are contained to the haze when the additive particles are not contained is preferably 1.10 or less, and more preferably 1.00 or less. By making the ratio of the haze when the additive particles are contained to the haze when the additive particles are not contained 1.10 or less, the decrease in the transparency of the laminate 650 can be suppressed. In addition, by dispersing the additive particles to suppress the growth of the aggregates, the stripe unevenness can be suppressed.

[0878] After the coating liquid is prepared, it is more preferable to perform a filtration treatment before coating. For example, by making the pore diameter of the filter 1.0 μm or less, the aggregates after the filtration can be made 1.0 μm or less.

[0879] The laminated film 650 can suppress the permeation of oxygen and water vapor that have permeated the resin layer 612 through the adhesive layer 620 and the sealant layer 630, because it has the barrier layer 614 having barrier properties against oxygen and water vapor. Therefore, the permeation of oxygen and water vapor into the packaging bag can be suppressed. Thus, in a packaging body in which the packaging bag formed of the laminated film 650 contains a packaged product, the deterioration of the packaged product due to at least one of oxygen and water vapor can be suppressed. The deterioration of the polyvalent metal particle or polyvalent metal compound particle due to at least one of oxygen and water vapor that has permeated from the outside can also be similarly suppressed.

[0880] The laminated film 650 can adsorb odor origin substances such as sulfur compounds that have permeated the sealant layer 630 and permeated into the adhesive layer 620, because it has the adhesive layer 620 containing polyvalent metal particles or polyvalent metal compound particles between the base material film 610 and the sealant layer 630. Thus, in a packaging body in which the packaging bag formed of the laminated film 650 contains a packaged product, odor origin substances such as sulfur compounds originating from the packaged product permeate into the adhesive layer 620, and are captured by the polyvalent metal particles or polyvalent metal compound particles. As a result, the high-temperature cooking odor in the packaged product can be reduced.

[0881] The polyvalent metal particles or polyvalent metal compound particles are contained in such a manner that the haze in the light-transmissive portion of the laminated film 650 is 30% or less. This makes it possible to achieve high transparency, improved visibility of the packaged product through the laminated film 650, and suppression of unevenness in the form of stripes.

[0882] The polyvalent metal particles or polyvalent metal compound particles are contained in such a manner that the haze is 30% or less, more preferably 25% or less. This makes it possible to suppress a decrease in the lamination strength of the adhesive layer 620. Since the polyvalent metal particles or polyvalent metal compound particles are mixed in the adhesive component of the adhesive layer 620, it is also possible to suppress deterioration of the polyvalent metal particles or polyvalent metal compound particles due to a reaction with components such as acetic acid or cysteine contained in the packaged product. Thus, the effects of reducing odor origin substances and suppressing a decrease in the lamination strength over time are achieved.

[0883] As described above, the laminated film 650 according to the present embodiment makes it possible to provide a laminated film in which a packaged product is easily visible. Furthermore, the laminated film 650 according to the present embodiment makes it possible to provide a laminated film in which a high-temperature cooking odor is reduced and the lamination strength is good. In addition, the laminated film 650 according to the present embodiment makes it possible to suppress an increase in haze and unevenness in the form of stripes by implementing physical fiberization processing using a bead mill, dispersing the additive particles in the coating liquid efficiently to suppress the growth of aggregates in the coating liquid, and thus suppressing a decrease in the transparency and unevenness in the form of stripes of the laminated film 650.

[0884] [Twelfth Embodiment]

[0885] The laminated film of the twelfth embodiment of the present application will be described.

[0886] Figure 17 A schematic cross-sectional view showing an example of the laminated film of the twelfth embodiment of the present application.

[0887] Figure 17 In the laminated film 660 of the present embodiment, a base material film 610A is provided instead of the base material film 610 in the laminated film 650 of the eleventh embodiment. The laminated film 660 can be provided with a light-transmissive portion in at least a part thereof, and in the example shown in the figure, the entire laminated film 660 is a light-transmissive portion. Figure 17 In the example shown in the figure, the entire laminated film 660 is a light-transmissive portion.

[0888] The base material film 610A is provided with an adhesive layer 616 and an intermediate layer 618 in this order between the barrier layer 614 and the adhesive layer 620. The following description will focus on aspects different from those of the eleventh embodiment.

[0889] The adhesive layer 616 is a layer that adheres the barrier layer 614 and the intermediate layer 618.

[0890] The adhesive layer 616 uses one or more of the materials exemplified as the adhesive component in the adhesive layer 620. The adhesive layer 616 can be formed of the same material as the adhesive layer 620 in the laminated film 660, or can be formed of a different material.

[0891] The adhesive layer 616 can contain no additive particles, or can contain additive particles.

[0892] When the adhesive layer 616 contains additive particles, the laminated film 660 is an example in which a plurality of adhesive layers containing additive particles are provided.

[0893] When the adhesive layer 616 contains additive particles, the kind, content, specific surface area, layer thickness, and average particle diameter of the additive particles in the adhesive layer 616 are not particularly limited as long as the haze of the light-transmissive portion of the laminated film 660 is 30% or less, more preferably 25% or less.

[0894] For example, the kind, content, specific surface area, layer thickness, and average particle diameter of the additive particles in the adhesive layer 616 are more preferably the same kind and preferable numerical ranges as exemplified for the adhesive layer 620 in the laminated film 650.

[0895] The kind, content, specific surface area, layer thickness, and average particle diameter of the adhesive layer 620 in the laminated film 660 are also the same.

[0896] When the adhesive layer 616 contains additive particles, the maximum diameter and distribution of the additive particle agglomerates in the laminated film 660 are not particularly limited as long as the haze of the light-transmissive portion of the laminated film 660 is 30% or less, more preferably 25% or less.

[0897] The maximum diameter of the aggregate of the additive particles in the laminated film 660 is more preferably the preferable range of the adhesive layer 620, 616 in the laminated film 660, respectively, as the adhesive layer 620 in the laminated film 650.

[0898] The distribution of the aggregate of the additive particles in the laminated film 660 is more preferably the preferable range of the adhesive layer 620, 616 in the laminated film 660, respectively, as the adhesive layer 620 in the laminated film 650.

[0899] The intermediate layer 618 is a resin layer disposed between the barrier layer 614 and the sealant layer 630. The intermediate layer 618 is adhered to the barrier layer 614 via the adhesive layer 616 and adhered to the sealant layer 630 via the adhesive layer 620.

[0900] The material of the intermediate layer 618 is not particularly limited as long as the intermediate layer 618 is a light-transmitting resin layer in which the haze of the laminated film 660 can be 30% or less, more preferably 25% or less.

[0901] The kind of the intermediate layer 618 can be appropriately selected depending on the use of the laminated film 660. If a resin film in which at least one of oxygen barrier property, water vapor barrier property, mechanical strength, bending resistance, puncture resistance, impact resistance, abrasion resistance, cold resistance, heat resistance, chemical resistance, and light resistance is excellent is selected, for example, the property is improved in the laminated film 660.

[0902] For example, as the preferable material of the intermediate layer 618, a film of nylon, polyethylene terephthalate, polyamide, polyethylene, polypropylene, polyvinyl chloride, polycarbonate, polyvinyl alcohol, ethylene-propylene copolymer, and ethylene-vinyl acetate copolymer saponate, and the like can be given.

[0903] For example, by using nylon as the intermediate layer 618, the softness is improved, and the occurrence of pinholes can be suppressed even when a large external force is applied. Therefore, when a packaging body is formed using a packaging bag using the laminated film 650, the occurrence of pinholes in the laminated film 660 can be suppressed, and deterioration of the packaged product can be suppressed. This effect is particularly useful when the packaged product is a food product.

[0904] The laminated film 660 of the present embodiment can be manufactured in the same manner as the laminated film 650 except that the base material film 610A in which the adhesive layer 616 and the intermediate layer 618 are laminated on the barrier layer 614 is formed instead of the base material film 610.

[0905] In particular, when the adhesive layer 616 contains the additive particles, the adhesive layer 616 can be manufactured in the same manner as the adhesive layer 620 of the eleventh embodiment.

[0906] The laminated film 660 according to the present embodiment has the same configuration as the laminated film 650 of the eleventh embodiment except that the adhesive layer 616 and the intermediate layer 618 are laminated between the barrier layer 614 and the adhesive layer 620, and thus can provide a laminated film in which the high-temperature retort odor can be reduced, the lamination strength is good, and further the transparency can be suppressed from decreasing by suppressing an increase in haze, and the packaged article is easy to see.

[0907] In particular, according to the laminated film 660, the properties of the laminated film 660 can be improved in correspondence with the properties of the intermediate layer 618 because the intermediate layer 618 is included.

[0908] Further, when the multivalent metal particles or the multivalent metal compound particles are included in the adhesive layer 616, the layer that captures the odor source substance exists in two layers, and thus the odor source substance reduction effect can be improved.

[0909] [Thirteenth Embodiment]

[0910] A packaging bag and a packaging body according to the thirteenth embodiment of the present application will be described.

[0911] Figure 18 A schematic front view showing an example of the packaging bag and the packaging body according to the thirteenth embodiment of the present application.

[0912] As shown in Figure 18 , the packaging body 800 according to the present embodiment includes the packaging bag 700 according to the present embodiment and the packaged article 710 housed inside the packaging bag 700.

[0913] The packaging bag 700 includes a sealing portion 701 in which edges of a pair of the laminated films 650 cut into a substantially rectangular shape are adhered, and a housing portion 702 formed between the pair of the laminated films 650 surrounded by the sealing portion 701. That is, the side end portion, the lower end portion, and the upper end portion of the packaging bag 700 are sealed by the sealing portion 701.

[0914] The housing portion 702 is sandwiched between the pair of the laminated films 650 to form a housing space surrounded by the sealing portion 701, and the packaged article 710 such as a food is housed therein.

[0915] For example, the packaging body 800 can also be a retort food in which the packaged article 710 formed of a food is heat sterilized and sealed with the packaging bag 700.

[0916] The pair of the laminated films 650 are formed by cutting the laminated film 650 according to the eleventh embodiment into an appropriate size.

[0917] The pair of the laminated films 650 are overlapped in a manner in which the respective adhesive layers 630 face each other. The respective adhesive layers 630 are heat-fusibly bonded at the outer peripheral portions of the pair of the laminated films 650. Thereby, the sealing portion 701 is formed.

[0918] The packaging bag 700 has an opening portion 720. For example, the opening portion 720 has a pair of easy-open processing portions 724 formed in the sealing portion 701 at the side end and a semi-tangent line 721 forming a cutting track between the pair of easy-open processing portions 724.

[0919] The easy-opening processing section 724 is not particularly limited as long as it allows the packaging bag 700 to be easily opened. For example, the easy-opening processing section 724 can be formed by a group of traces formed by a collection of micro-recesses formed on the surface of the sealing section 701. For example, the easy-opening processing section 724 can also be a cut that extends through the thickness direction at the end edge of the sealing section 701. The shape of the cut is not particularly limited, and can be, for example, a V-shaped, U-shaped, or I-shaped cut.

[0920] For example, the semi-tangent 721 can be formed by laser processing.

[0921] The manufacturing methods of the packaging bag 700 and the packaging body 800 are described.

[0922] Figure 19 This is a schematic perspective view illustrating a method for manufacturing a packaging bag according to the thirteenth embodiment of the present invention.

[0923] Prepare a pair of laminated films 650 to be cut according to the shape of the packaging bag 700.

[0924] After that, as Figure 19 As shown, the sealant layers 630 of each laminated film 650 are made to face each other, and the sealant layers 630 at the lower end and side end of each laminated film 650 are thermally melted and bonded together.

[0925] Thus, a sealing portion 701 is formed on the lower end and the side end. A receiving portion 702 is formed inside each of the U-shaped laminated films 650 surrounded by the sealing portion 701.

[0926] An opening is formed at the upper end of the packaging bag 700, which connects to the receiving part 702.

[0927] Next, the packaged item 710 is filled into the unsealed packaging bag 700 from the upper end. Then, the sealant layers 630 of the stacked films 650 facing each other are thermally fused together at the upper end, forming a sealing portion 701 at the upper end as well. In this way, a package can be manufactured. Figure 18 The package shown is 800.

[0928] In the packaging bag 700 of this embodiment, the receiving portion 702 is formed by the same laminated film 650 as in the eleventh embodiment.

[0929] Each laminated membrane 650, due to the presence of a barrier layer 614, can suppress the permeation of oxygen and water vapor from the outside into the inside, and can prevent the deterioration of components and packaged contents 710 that are further inside the barrier layer 614 due to oxygen and water vapor.

[0930] Each laminated film 650 contains polyvalent metal particles or polyvalent metal compound particles in the adhesive layer 620, which is located further inside the barrier layer 614 (on the packaged item side). Therefore, it can adsorb sulfur compounds and other high-temperature cooking odor-generating substances produced by the packaged item 710 for an extended period. Thus, the packaging bag 700 can suppress the accumulation of high-temperature cooking odor-generating substances inside the packaged item 710 within the receiving section 702.

[0931] As a result, the high-temperature cooking odor generated when the package is opened at 800°C can be reduced.

[0932] The packaged product 710 may sometimes contain, depending on its type, components that degrade the ability to capture off-flavors during high-temperature cooking (deterioration source components), thereby degrading the polyvalent metal particles or polyvalent metal compound particles. For example, acids such as acetic acid contained in various foods are prone to degrading polyvalent metal particles or polyvalent metal compound particles.

[0933] In this embodiment, since the polyvalent metal particles or polyvalent metal compound particles are mixed in the adhesive component and covered by the adhesive component, the chemical reaction between the polyvalent metal particles or polyvalent metal compound particles and the deterioration-originating component can be suppressed, thus making it difficult for the polyvalent metal particles or polyvalent metal compound particles to deteriorate.

[0934] As explained above, the packaging bag 700 and packaging body 800 according to this embodiment, having the laminated film 650 of the eleventh embodiment, can, like the eleventh embodiment, provide packaging bags and packaging bodies that can reduce the odor of high-temperature cooking, have good lamination strength, and make it easy to see the packaged items.

[0935] [Fourteenth Implementation]

[0936] The packaging bag and packaging body according to the fourteenth embodiment of the present invention will be described.

[0937] Figure 20 This is a schematic perspective view showing an example of a packaging bag and packaging body according to the fourteenth embodiment of the present invention.

[0938] like Figure 20 As shown, the packaging body 810 of this embodiment includes a packaging bag 750 and a packaged item 710, which is the same as that in the thirteenth embodiment.

[0939] The packaging bag 750 is a self-standing bag having a pair of the laminated films 650 and the bottom tape 752 attached to the lower end portions of the laminated films 650. The bottom tape 752 is formed of a laminated film having the same layers as the laminated film 650.

[0940] The packaging bag 750 and the packaging body 810 of the present embodiment are formed into a self-standing bag shape by including the bottom tape 752, and are otherwise configured similarly to the packaging bag 700 and the packaging body 800 of the thirteenth embodiment.

[0941] The packaging body 810 can be manufactured by using a known self-standing bag manufacturing method using a pair of the laminated films 650 and the bottom tape 752, after the packaging bag 750 having the opening formed in the upper end portion is manufactured, filling the packaging contents 710 from the upper end portion, sealing the upper end portion, and forming the seal portion 701.

[0942] The packaging bag 750 and the packaging body 810 of the present embodiment have the laminated film 650 similarly to the thirteenth embodiment, and thus have the same effects as the thirteenth embodiment.

[0943] Further, in each of the above embodiments, an example in which the entire laminated film 650, 660 is the light-transmitting portion is described.

[0944] However, by providing the printing layer at an appropriate position of the laminated film 650, 660 to form the light-blocking portion on a portion of the laminated film 650, 660, the light-transmitting portion can also be formed on a portion of the laminated film 650, 660.

[0945] For example, when the packaging bag 700 is formed using a pair of the laminated films 650 as in the thirteenth embodiment, the light-blocking portion formed of the printing layer can also be formed on one or both of the pair of the laminated films 650.

[0946] For example, in the laminated film 650, 660, the printing layer can also be provided between the resin layer 612 and the barrier layer 614.

[0947] The printing layer is, for example, a layer formed of an ink in which various pigments, plasticizers, drying agents, stabilizers, and the like are added to an adhesive resin such as urethane-based, acrylic-based, nitrocellulose-based, or rubber-based. By the printing layer, characters, patterns, and the like can be displayed. As the printing method, for example, a known printing method such as offset printing, gravure printing, flexographic printing, screen printing, inkjet printing, or the like can be used.

[0948] The surface 612b of the resin layer 612 on which the printing layer is formed can also be subjected to corona treatment or ozone treatment as a pretreatment in advance. At this time, the adhesion of the printing layer to the resin layer 612 can be improved.

[0949] The layer configuration of the laminated film in the first and twelfth embodiments described above is an example. For example, the laminated film may have any layer or film between the adhesive layer 620 and the sealant layer 630, or between the resin layer 612 and the barrier layer 614, without seriously impairing the function of the laminated film.

[0950] In the description of the twelfth embodiment above, examples were described in which the adhesive layer 620 of the laminated film 660 contains polyvalent metal particles or polyvalent metal compound particles, and examples were described in which both the adhesive layers 620 and 616 of the laminated film 660 contain polyvalent metal particles or polyvalent metal compound particles. However, polyvalent metal particles or polyvalent metal compound particles may also be contained only in the adhesive layer 616.

[0951] In the description of the twelfth embodiment above, an example with a single intermediate layer was used. However, the laminated film may also contain two or more intermediate layers.

[0952] In the thirteenth embodiment described above, an example of forming a packaging bag 700 and a packaging body 800 using a pair of laminated films 650 was used.

[0953] However, as Figure 18 and Figure 19 As shown, a pair of laminated films 660 can be used instead of a pair of laminated films 650 to form a packaging bag 700A and a packaging body 800A.

[0954] The packaging bag 700A and the packaging body 800A can be manufactured in the same way as the packaging bag 700 and the packaging body 800, except that a pair of laminated films 660 are used instead of a pair of laminated films 650.

[0955] Packaging bag 700A and packaging body 800A have the same function as laminated film 660 because they have a pair of laminated films 660.

[0956] In the fourteenth embodiment described above, an example of forming a packaging bag 750 and a packaging body 810 using a pair of laminated films 650 was illustrated.

[0957] However, as Figure 20 As shown, a pair of laminated films 660 can be used instead of a pair of laminated films 650 to form a packaging bag 750A and a packaging body 810A.

[0958] The packaging bag 750A and the packaging body 810A can be manufactured in the same way as the packaging bag 750 and the packaging body 810, except that a pair of laminated films 660 are used instead of a pair of laminated films 650.

[0959] Packaging bag 750A and packaging body 810A have the same function as laminated film 660 because they have a pair of laminated films 660.

[0960] In the above-described thirteenth and fourteenth embodiments, examples in which the packaging bag and the packaging body are formed using a pair of the laminated film 650 are described. However, as long as the laminated film 650 is used in a part of the outer peripheral portion of the packaging bag and the packaging body, the laminated film in the other outer peripheral portion can have a layer configuration different from that of the laminated film 650.

[0961] For example, when the polyvalent metal particles or the polyvalent metal compound particles contained in one laminated film 650 can suppress the high-temperature cooking odor, the polyvalent metal particles or the polyvalent metal compound particles can not be contained in the other laminated film.

[0962] For example, when the contents of the packaged article can be seen by forming a light-transmitting portion in one laminated film 650, the light-transmitting portion can not be formed in the other laminated film 650.

[0963] In the above-described thirteenth and fourteenth embodiments, examples in which the packaging bag is a four-side sealed bag and a stand-up pouch are described, but the shape of the packaging bag is not limited to these and can have other bag shapes known in the art.

[0964] For example, the shape of the packaging bag can be a two-side sealed bag, a three-side sealed bag, or a clutch bag.

[0965] For example, the packaging bag can have a synthetic resin-made zipper that can be repeatedly sealed by fitting a container spout plug or a belt-shaped protruding portion into a belt-shaped recessed portion.

[0966] In the above-described thirteenth and fourteenth embodiments, examples in which the packaged article 710 is a food are described, but the packaged article 710 is not limited to a food.

[0967] Further, in the light-transmitting portion, the ratio of the haze measured according to the haze measurement method prescribed in JIS-K-7136 to the haze measured according to the measurement method in the light-transmitting portion when the polyvalent metal particles and the polyvalent metal compound particles are not contained in the adhesive layer 620 can be 1.10 or less, and in the adhesive layer 620, the ratio of the minimum diameter of the aggregate formed by the polyvalent metal particles or the polyvalent metal compound particles to the maximum diameter of the aggregate can be 14.0 times or less.

[0968] [Examples]

[0969] Next, Examples 1 to 19 of the twelfth embodiment of the present application are described together with Comparative Examples 1 to 17.

[0970] First, the particle dispersion liquids used in the production of the laminated films of Examples 1 to 19 and Comparative Examples 2 to 17 are described together. Each of the particle dispersion liquids is used to produce an adhesive containing polyvalent metal compound particles.

[0971] The composition and dispersion treatment of the particle dispersion liquid used in the production of the laminated film of Examples 1 to 19 and Comparative Examples 2 to 17 are shown in the following [Table 5].

[0972] [Table 5]

[0973]

[0974] [Particle dispersion liquid 11Aa]

[0975] As shown in [Table 5], the particle dispersion liquid 11Aa was produced by dispersing microparticles of zinc oxide (ZnO) as a multivalent metal oxide (hereinafter referred to as zinc oxide particles) in ethyl acetate as a solvent.

[0976] The particle dispersion liquid 11Aa was produced as follows.

[0977] First, zinc oxide particles were added to ethyl acetate as a solvent to form a mixed liquid. As the zinc oxide particles, FINEX-30 (trade name; manufactured by Sakai Chemical Industry Co., Ltd.) having an average particle diameter of 35 nm and a specific surface area of 30 m 2 / g was used. The amount of FINEX (registered trademark)-30 added was an amount in which the solid content concentration of the mixed liquid reached 30 mass%.

[0978] Subsequently, a dispersant A containing a polyester amide amine salt, an alkylcyclohexane, and propylene glycol monomethyl ether acetate was added to the mixed liquid. The dispersant A was a dispersant in which an amide amine acid of a high-molecular-weight polyester acid was the main component.

[0979] The amount of the dispersant A added was 5 mass parts based on 100 mass parts of the solid content of the zinc oxide particles in the mixed liquid.

[0980] The mixed liquid was subjected to a dispersion treatment using a bead mill ([Table 5] is described as “bead mill”).

[0981] Thus, the particle dispersion liquid 11Aa in which the zinc oxide particles were dispersed in the solvent was produced.

[0982] [Particle dispersion liquid 11Ba]

[0983] The particle dispersion liquid 11Ba was produced in the same manner as the particle dispersion liquid 11Aa except that the amount of the dispersant added was 40 mass parts.

[0984] [Particle dispersion liquid 11Ca]

[0985] The particle dispersion liquid 11Ca was produced in the same manner as the particle dispersion liquid 11Aa except that the amount of the dispersant added was 20 mass parts.

[0986] [Particle dispersion liquids 12Aa and 12Ba]

[0987] Particle dispersion liquid 12Aa was prepared in the same manner as particle dispersion liquid 11Aa except that a phosphoric acid ester-containing dispersant B was used instead of dispersant A as the dispersant. Dispersant B is a polyether phosphoric acid ester compound-based dispersant.

[0988] Particle dispersion liquid 12Ba was prepared in the same manner as particle dispersion liquid 12Aa except that the amount of dispersant added was 40 parts by mass.

[0989] [Particle dispersion liquids 13Aa, 13Ba]

[0990] Particle dispersion liquid 13Aa was prepared in the same manner as particle dispersion liquid 11Aa except that a dispersant C containing a vinyl chloride-vinyl acetate-based copolymer, acetone, and methanol was used instead of dispersant A as the dispersant. Dispersant C is a dispersant in which a vinyl chloride-vinyl acetate copolymer resin is the main component.

[0991] Particle dispersion liquid 13Ba was prepared in the same manner as particle dispersion liquid 13Aa except that the amount of dispersant added was 40 parts by mass.

[0992] [Particle dispersion liquids 14Aa, 14Ba, 14Ca]

[0993] Particle dispersion liquid 14Aa was prepared in the same manner as particle dispersion liquid 11Aa except that the average particle diameter of the zinc oxide particles was 20 nm and the specific surface area was 50 m 2 / g.

[0994] Particle dispersion liquid 14Ba was prepared in the same manner as particle dispersion liquid 14Aa except that the amount of dispersant added was 40 parts by mass.

[0995] Particle dispersion liquid 14Ca was prepared in the same manner as particle dispersion liquid 14Aa except that the amount of dispersant added was 20 parts by mass.

[0996] [Particle dispersion liquids 15Aa, 15Ba]

[0997] Particle dispersion liquid 15Aa was prepared in the same manner as particle dispersion liquid 11Aa except that the average particle diameter of the zinc oxide particles was 60 nm and the specific surface area was 25 m 2 / g.

[0998] Particle dispersion liquid 15Ba was prepared in the same manner as particle dispersion liquid 15Aa except that the amount of dispersant added was 40 parts by mass.

[0999] [Particle dispersion liquids 100a, 200a, 300a, 400a]

[1000] Particle dispersion liquid 100a was prepared in the same manner as particle dispersion liquid 11Aa except that no dispersant was added.

[1001] Particle dispersion liquid 400a was prepared in the same manner as the particle dispersion liquid 100a except that the average particle diameter of the zinc oxide particles was 20 nm and the specific surface area was 50 m 2 / g.

[1002] Particle dispersion liquid 200a was prepared in the same manner as the particle dispersion liquid 100a except that, instead of the zinc oxide particles, aluminum oxide (AI2O3) particles (hereinafter referred to as aluminum oxide particles) manufactured by Fuji Photo Film Co., Ltd. and Gohsen Co., Ltd. were used. The average particle diameter of the aluminum oxide particles was 45 nm and the specific surface area was 27 m 2 / g.

[1003] Particle dispersion liquid 300a was prepared in the same manner as the particle dispersion liquid 100a except that, instead of the zinc oxide particles, magnesium oxide (MgO) particles (hereinafter referred to as magnesium oxide particles) manufactured by Stream Chemicals Co., Ltd. were used. The average particle diameter of the magnesium oxide particles was 20 nm and the specific surface area was 50 m 2 / g.

[1004] [Particle dispersion liquids 11Ab, 11Bb, 11Cb]

[1005] Particle dispersion liquid 11Ab was prepared in the same manner as the particle dispersion liquid 11Aa except that the dispersion treatment using the bead mill was not performed and the mixed solution was stirred using the stirring blade for 10 minutes (described as "stirring only" in [Table 5]).

[1006] Particle dispersion liquid 11Bb was prepared in the same manner as the particle dispersion liquid 11Ab except that the amount of the dispersant added was 40 parts by mass.

[1007] Particle dispersion liquid 11Cb was prepared in the same manner as the particle dispersion liquid 11Ab except that the amount of the dispersant added was 20 parts by mass.

[1008] [Particle dispersion liquids 14Ab, 14Bb]

[1009] Particle dispersion liquid 14Ab was prepared in the same manner as the particle dispersion liquid 14Aa except that the dispersion treatment using the bead mill was not performed and the mixed solution was stirred using the stirring blade for 10 minutes.

[1010] Particle dispersion liquid 14Bb was prepared in the same manner as the particle dispersion liquid 14Ab except that the amount of the dispersant added was 40 parts by mass.

[1011] [Particle dispersion liquids 100b, 200b, 300b, 400b]

[1012] Particle dispersion liquid 100b was prepared in the same manner as the particle dispersion liquid 100a except that the dispersion treatment using the bead mill was not performed and the mixed solution was stirred using the stirring blade for 10 minutes.

[1013] Particle dispersion liquid 200b was prepared in the same manner as particle dispersion liquid 200a except that the dispersion treatment using a planetary bead mill was not performed and the mixed liquid was stirred using a stirring blade for 10 minutes.

[1014] Particle dispersion liquid 300b was prepared in the same manner as particle dispersion liquid 300a except that the dispersion treatment using a planetary bead mill was not performed and the mixed liquid was stirred using a stirring blade for 10 minutes.

[1015] Particle dispersion liquid 400b was prepared in the same manner as particle dispersion liquid 400a except that the dispersion treatment using a planetary bead mill was not performed and the mixed liquid was stirred using a stirring blade for 10 minutes.

[1016] The manufacturing conditions and evaluation results of Examples 1 to 19 and Comparative Examples 1 to 17 are shown in the following [Table 6], [Table 7].

[1017] [Table 6]

[1018]

[1019] [Table 7]

[1020]

[1021] [Example 1]

[1022] In Example 1, as the resin layer 612, Toyobo Ester (registered trademark) Film E5100 (trade name; manufactured by Toyobo Co., Ltd.) which is biaxially stretched polyethylene terephthalate was used. The thickness of E5100 was 12 μm, the length was 500 m, and the width was 600 mm.

[1023] The one surface 12b of the resin layer 612 was subjected to corona treatment, and a barrier layer 614 formed of SiOx was formed on the surface 12b subjected to the corona treatment using a vacuum evaporation machine.

[1024] Specifically, an evaporation material in which metal silicon powder and silica powder were mixed was prepared, and the surface 12b was subjected to evaporation in such a manner that an evaporation layer in which the element ratio of O / Si was 1.5 (x = 1.5) was formed using a vacuum evaporation machine. The thickness of the barrier layer 614 was 50 nm.

[1025] Subsequently, a two-component curable polyurethane-based adhesive A626 / A50 (trade name; manufactured by Mitsui Chemicals, Inc.) was applied to the barrier layer 614 using a dry laminator, and Emblem (registered trademark) ON (trade name; manufactured by Unitika Ltd.) which is a nylon film having a thickness of 15 μm was laminated. Thus, an adhesive layer 616 and an intermediate layer 618 were formed.

[1026] The coating liquid for forming the adhesive layer 620 was prepared using the particle dispersion liquid 11Aa as follows.

[1027] The above-mentioned A626 and A50 as the two-component curable polyurethane-based adhesive were mixed in a mass ratio of 8:1, diluted with ethyl acetate, and an adhesive having a solid content concentration of 30 mass% was formed. Thereafter, the particle dispersion liquid 11Aa was added to the adhesive, and adjusted in a manner such that the ratio of the solid content of the zinc oxide particles to the total mass of the solid content of the adhesive and the solid content of the zinc oxide particles was 1.5 mass%.

[1028] Hereinafter, the "ratio of the solid content of the polyvalent metal compound particles to the total mass of the solid content of the adhesive and the solid content of the polyvalent metal compound particles" will be referred to as the "amount of particles in the coating liquid" for simplicity. This is described as "amount of particles" in [Table 6].

[1029] Thereafter, the mixed liquid of the adhesive and the particle dispersion liquid 11Aa was stirred with a stirring wing for 30 minutes. Thereafter, the mixed liquid was filtered with a filter membrane having a pore diameter of 1 μm, and a coating liquid 11Aa used in Example 1 was obtained. In the particle dispersion liquid 11Aa subjected to the dispersion treatment, since the zinc oxide particles were difficult to aggregate, most of the zinc oxide particles in the mixed liquid passed through the filter membrane.

[1030] Thereafter, the coating liquid 11Aa was coated on the intermediate layer 618 using a dry laminator, and a polyolefin-based non-stretching co-extruded film having a thickness of 80 μm was attached as the sealant layer 630.

[1031] Thus, a laminated film 660 having the laminated structure shown in Figure 17 was obtained. That is, the laminated film 660 had, in order, the sealant layer 630 formed of a polyolefin-based non-stretching co-extruded film, the adhesive layer 620 containing zinc oxide particles, the intermediate layer 618 formed of a nylon film, the adhesive layer 616 not containing zinc oxide particles, the barrier layer 614, and the resin layer 612.

[1032] The amount of particles of the zinc oxide particles in the adhesive layer 620 was also 1.5 mass% as the amount of particles in the coating liquid.

[1033] Thereafter, the laminated film 660 of Example 1 was attached in a manner such that the sealant layers 630 faced each other, and a packaging bag 700A of Example 1 of a three-side sealed bag as shown in Figure 19 was produced.

[1034] Thereafter, the contents 710 were housed in the packaging bag 700A and sealed, and a packaging body 800A of Example 1 was produced.

[1035] As the wrapped article 710, a cysteine aqueous solution containing 0.03 mass% of cysteine was used.

[1036] [Examples 2 to 19]

[1037] In Example 2, in addition to the coating liquid 11Ca using a particle dispersion liquid in which the particle amount of the zinc oxide particles in the coating liquid 11Aa was 3.0 mass% and the addition amount of the dispersant was 20 parts by mass, the laminated film 660, the packaging bag 700A, and the packaging body 800A were produced in the same manner as in Example 1.

[1038] In Example 3, in addition to the coating liquid 11Ca+ using a particle dispersion liquid in which the particle amount of the zinc oxide particles was 5.0 mass%, the laminated film 660, the packaging bag 700A, and the packaging body 800A were produced in the same manner as in Example 2.

[1039] In Example 4, in addition to the coating liquid 11Ba using a particle dispersion liquid in which the addition amount of the dispersant was 40 parts by mass, the laminated film 660, the packaging bag 700A, and the packaging body 800A were produced in the same manner as in Example 1.

[1040] In Example 5, in addition to the coating liquid 12Aa using a particle dispersion liquid in which the addition amount of the dispersant B as the dispersant was 5 parts by mass, the laminated film 660, the packaging bag 700A, and the packaging body 800A were produced in the same manner as in Example 1.

[1041] In Example 6, in addition to the coating liquid 12Ba using a particle dispersion liquid in which the addition amount of the dispersant was 40 parts by mass, the laminated film 660, the packaging bag 700A, and the packaging body 800A were produced in the same manner as in Example 5.

[1042] In Example 7, in addition to the coating liquid 13Aa using a particle dispersion liquid in which the addition amount of the dispersant C as the dispersant was 5 parts by mass, the laminated film 660, the packaging bag 700A, and the packaging body 800A were produced in the same manner as in Example 1.

[1043] In Example 8, in addition to the coating liquid 13Ba using a particle dispersion liquid in which the addition amount of the dispersant was 40 parts by mass, the laminated film 660, the packaging bag 700A, and the packaging body 800A were produced in the same manner as in Example 7.

[1044] In Example 9, in addition to the coating liquid 100a using a particle dispersion liquid to which no dispersant was added, the laminated film 660, the packaging bag 700A, and the packaging body 800A were produced in the same manner as in Example 1.

[1045] In Example 10, the laminated film 660, the packaging bag 700A, and the packaging body 800A were produced in the same manner as in Example 1, except that the coating liquid 11Aa+ using the particle dispersion liquid in which the particle amount of the zinc oxide particles was 9.5 mass% was used instead of the coating liquid 11Aa.

[1046] In Example 11, the laminated film 660, the packaging bag 700A, and the packaging body 800A were produced in the same manner as in Example 9, except that the coating liquid 100a+ using the particle dispersion liquid in which the particle amount of the zinc oxide particles was 9.5 mass% was used instead of the coating liquid 100a.

[1047] In Example 12, the laminated film 660, the packaging bag 700A, and the packaging body 800A were produced in the same manner as in Example 1, except that the coating liquid 14Aa using the particle dispersion liquid in which the zinc oxide particles having an average particle diameter of 20 nm and a specific surface area of 50 m 2 / g were dispersed was used instead of the coating liquid 14Aa.

[1048] In Example 13, the laminated film 660, the packaging bag 700A, and the packaging body 800A were produced in the same manner as in Example 12, except that the coating liquid 14Ca using the particle dispersion liquid in which the particle amount of the zinc oxide particles was 3.0 mass% and the amount of the dispersant added was 20 mass parts was used instead of the coating liquid 14Ca.

[1049] In Example 14, the laminated film 660, the packaging bag 700A, and the packaging body 800A were produced in the same manner as in Example 13, except that the coating liquid 14Ca+ using the particle dispersion liquid in which the particle amount of the zinc oxide particles was 5.0 mass% was used instead of the coating liquid 14Ca.

[1050] In Example 15, the laminated film 660, the packaging bag 700A, and the packaging body 800A were produced in the same manner as in Example 12, except that the coating liquid 14Ba using the particle dispersion liquid in which the amount of the dispersant added was 40 mass parts was used instead of the coating liquid 14Ba.

[1051] In Example 16, the laminated film 660, the packaging bag 700A, and the packaging body 800A were produced in the same manner as in Example 12, except that the coating liquid 400a using the particle dispersion liquid in which the dispersant was not added was used instead of the coating liquid 400a.

[1052] In Example 17, the laminated film 660, the packaging bag 700A, and the packaging body 800A were produced in the same manner as in Example 9, except that the coating liquid 200a using the particle dispersion liquid in which the aluminum oxide particles having an average particle diameter of 45 nm and a specific surface area of 27 m 2 / g were dispersed was used instead of the coating liquid 200a.

[1053] In Example 18, the laminated film 660, the packaging bag 700A, and the packaging body 800A were produced in the same manner as in Example 12, except that the coating liquid 14Ba using the particle dispersion liquid in which the aluminum oxide particles having an average particle diameter of 20 nm and a specific surface area of 50 m 2The laminated film 660, the packaging bag 700A, and the packaging body 800A were produced in the same manner as in Example 9, except that the coating liquid 300a was used.

[1054] In Example 19, the laminated film 660, the packaging bag 700A, and the packaging body 800A were produced in the same manner as in Example 1, except that the coating liquid 11Aa- was used, which used a particle dispersion liquid in which the particle amount of the zinc oxide particles was 0.8 mass%.

[1055] Each of the particle dispersion liquids used in Examples 2 to 19 was subjected to dispersion treatment, whereby the polyvalent metal compound particles were difficult to aggregate. Therefore, in the filtration process at the time of producing each of the coating liquids, most of the polyvalent metal compound particles passed through the filter. Thus, the content of the polyvalent metal compound particles in the adhesive layer 620 of the laminated film 660 was the same as the particle amount in the coating liquid.

[1056] [Comparative Examples 1 to 17]

[1057] In Comparative Example 1, the laminated film, the packaging bag, and the packaging body of Comparative Example 1 were produced in the same manner as in Example 1, except that no polyvalent metal particles and no polyvalent metal compound particles were used, and thus no dispersion treatment using a bead mill was performed, and only a polyurethane-based adhesive was used to form the adhesive layer.

[1058] In Comparative Example 2, the laminated film, the packaging bag, and the packaging body of Comparative Example 2 were produced in the same manner as in Example 9, except that the coating liquid 100b was used instead of the coating liquid 100a.

[1059] In Comparative Example 3, the laminated film, the packaging bag, and the packaging body of Comparative Example 3 were produced in the same manner as in Comparative Example 2, except that the coating liquid 100b+ was used, which used a particle dispersion liquid in which the particle amount of the zinc oxide particles was 3.0 mass%.

[1060] In Comparative Example 4, the laminated film, the packaging bag, and the packaging body of Comparative Example 4 were produced in the same manner as in Example 1, except that the coating liquid 11Ab was used instead of the coating liquid 11Aa.

[1061] In Comparative Example 5, the laminated film, the packaging bag, and the packaging body of Comparative Example 5 were produced in the same manner as in Comparative Example 4, except that the coating liquid 11Cb was used, which used a particle dispersion liquid in which the particle amount of the zinc oxide particles was 3.0 mass%, and the addition amount of the dispersant was 20 mass parts.

[1062] In Comparative Example 6, the laminated film, the packaging bag, and the packaging body of Comparative Example 6 were produced in the same manner as in Comparative Example 4, except that the coating liquid 11Bb was used, which used a particle dispersion liquid in which the addition amount of the dispersant was 40 mass parts.

[1063] In Comparative Example 7, a laminated film, a packaging bag, and a packaging body of Comparative Example 7 were produced in the same manner as in Example 17, except that the coating liquid 200b was used instead of the coating liquid 200a.

[1064] In Comparative Example 8, a laminated film, a packaging bag, and a packaging body of Comparative Example 8 were produced in the same manner as in Example 18, except that the coating liquid 300b was used instead of the coating liquid 300a.

[1065] In Comparative Example 9, a laminated film, a packaging bag, and a packaging body of Comparative Example 9 were produced in the same manner as in Comparative Example 2, except that the coating liquid 100b++ using a particle dispersion liquid in which the particle amount of zinc oxide particles was 9.5 mass% was used.

[1066] In Comparative Example 10, a laminated film, a packaging bag, and a packaging body of Comparative Example 10 were produced in the same manner as in Comparative Example 7, except that the coating liquid 200b+ using a particle dispersion liquid in which the particle amount of aluminum oxide particles was 9.5 mass% was used.

[1067] In Comparative Example 11, a laminated film, a packaging bag, and a packaging body of Comparative Example 11 were produced in the same manner as in Comparative Example 8, except that the coating liquid 300b+ using a particle dispersion liquid in which the particle amount of magnesium oxide particles was 9.5 mass% was used.

[1068] In Comparative Example 12, a laminated film, a packaging bag, and a packaging body of Comparative Example 12 were produced in the same manner as in Example 12, except that the coating liquid 14Ab was used instead of the coating liquid 14Aa.

[1069] In Comparative Example 13, a laminated film, a packaging bag, and a packaging body of Comparative Example 13 were produced in the same manner as in Comparative Example 12, except that the coating liquid 14Bb using a particle dispersion liquid in which the addition amount of the dispersant was 40 mass parts was used.

[1070] In Comparative Example 14, a laminated film, a packaging bag, and a packaging body of Comparative Example 14 were produced in the same manner as in Example 16, except that the coating liquid 400b was used instead of the coating liquid 400a.

[1071] In Comparative Example 15, a laminated film, a packaging bag, and a packaging body of Comparative Example 15 were produced in the same manner as in Example 1, except that the coating liquid 11Aa++ using a particle dispersion liquid in which the particle amount of zinc oxide particles was 11 mass% was used.

[1072] In Comparative Example 16, a laminated film, a packaging bag, and a packaging body of Comparative Example 16 were produced in the same manner as in Example 1, except that the coating liquid 15Aa using a particle dispersion liquid in which the average particle diameter of zinc oxide particles was 60 nm and the specific surface area was 25 m 2 / g was used.

[1073] In Comparative Example 17, a laminated film, a packaging bag, and a packaging body of Comparative Example 17 were produced in the same manner as in Comparative Example 16 except that the coating liquid 15Bb using the particle dispersion liquid in which the amount of the dispersant used was 40 parts by mass was used.

[1074] [Measurement items]

[1075] In order to evaluate each of the examples and the comparative examples, the haze, the ratio of the haze to the haze of Comparative Example 1 (haze ratio), the maximum diameter, the minimum diameter, and the average diameter of the aggregate, the hydrogen sulfide (H2S) concentration, and the lamination strength were measured.

[1076] The haze was measured according to JIS-K-7136 using the laminated film of each of the examples and the comparative examples as a test sample. The haze was measured using a haze meter NDH 2000 (trade name; manufactured by Nippon Denshoku Industries Co., Ltd.). A halogen lamp of 5V9W was used as a light source, and a silicon photometer was used as a light receiving element. The measurement area was a rectangular area of 4 cm x 4 cm. The measurement positions in the winding direction (lengthwise direction) of the laminated film were two positions near the start position and the end position of the coating of the coating liquid. The distance between the start position and the end position of the coating was 500 mm. The measurement positions in the widthwise direction at each measurement position in the winding direction were three positions including the central portion and two positions each of which was 200 mm apart from the central portion on both sides.

[1077] The size of the aggregate was measured using a scanning electron microscope by photographing a cross-sectional image at a magnification of 10,000 times along the adhesive layer for 50 μm continuously using the laminated film of each of the examples and the comparative examples as a test sample.

[1078] In the hydrogen sulfide concentration measurement, the packaging body in which the cysteine aqueous solution of each of the examples and the comparative examples was housed was used as a test sample.

[1079] Each of the test sample packaging bodies was subjected to a high-temperature cooking treatment at 120°C for 60 minutes. After the high-temperature cooking treatment, the packaging body was stored in a refrigerator for one week. The aqueous solution in each of the packaging bodies after the collection was subjected to the measurement of the hydrogen sulfide concentration using the methylene blue method (wavelength: 668 nm). In the calculation of the hydrogen sulfide concentration, a standard curve prepared in advance was used. The results of the measurement of the hydrogen sulfide concentration are shown in [Table 7].

[1080] As a test sample for the measurement of the lamination strength, the packaging bag before the high-temperature cooking treatment and the packaging bag after the high-temperature cooking treatment in each of the examples and the comparative examples were used.

[1081] The packaging bag corresponding to the one before the high-temperature retort treatment was aged at 45°C for 4 days. Thereafter, the lamination strength between the nylon layer and the sealant layer was measured in accordance with JIS Z0238:1998. Specifically, the lamination strength of each test sample was measured using a universal tensile material tester (trade name; manufactured by A&D Company, Ltd.) using a T-type peeling method (crosshead speed: 300 mm / minute). The measurement results are shown in the "Lamination strength before high-temperature retort" column of [Table 7].

[1082] The test sample of the packaging bag after the high-temperature retort treatment was measured for the lamination strength (N / 15 mm width) in the same manner as the packaging bag corresponding to the one before the high-temperature retort treatment. The measurement results are shown in the "Lamination strength after high-temperature retort" column of [Table 7]. In [Table 7], (N / 15 mm width) is expressed as (N) only.

[1083] [Measurement results]

[1084] As shown in [Table 6] and [Table 7], the haze ratio of the laminated film 660 of Examples 1 to 19 in which the average particle diameter of the additive particles was 10 nm or more and 50 nm or less and the particle amount was 0.5% by mass or more and 10% by mass or less was 1.10 or less, and more specifically, the haze ratio was 1.00.

[1085] Generally, the haze increases as the particle amount increases, but the haze ratio of the laminated film 660 of Examples 1 to 19 was equivalent to that of the laminated film of Comparative Example 1 that did not contain the additive particles.

[1086] The average diameter of the aggregates observed in the laminated film 660 of Examples 1 to 19 was 20 nm or more and 120 nm or less, and the maximum diameter (major axis) was 250 nm or less. The "average diameter of the aggregates" is a value obtained by adding up the diameters (major axes) of the aggregates and dividing by the number of the aggregates. When the average particle diameter of the additive particles was taken into consideration, it was confirmed that the number of aggregates that existed within 10% or more and 200% or less of the average particle diameter in the width direction within a 50-μm rectangular region was 50 or more in the laminated film 660 of Examples 1 to 19 observed. That is, it was confirmed that a plurality of aggregates with a small maximum diameter, that is, fine aggregates were dispersed.

[1087] On the other hand, the haze ratio of the laminated film 660 of Comparative Examples 2 to 14 in which the dispersion treatment was only stirring was 1.12 to 1.32, and a good result was not obtained in comparison with the laminated film 660 of Examples 1 to 19.

[1088] The average diameter of the agglomerates observed in the laminated film 660 of Comparative Examples 2 to 14 was 2.0 μm or more, and the maximum diameter (major axis) was 3.0 μm or more. When the average particle diameter of the additive particles was taken into consideration, it was confirmed that the agglomerates observed in the laminated film 660 of Comparative Examples 2 to 15 were formed by the aggregation of 100 to several hundred additive particles.

[1089] Figure 21 An example of a photographic image of the laminated film of Example 2. Figure 22 An example of a photographic image of the laminated film of Comparative Example 5.

[1090] As shown in Figure 21 , no agglomerates exceeding 1 μm were observed in the laminated film of Example 2. As shown in Figure 22 , the size of the agglomerates observed in the laminated film of Comparative Example 5 exceeded 3.0 μm.

[1091] The adhesive layers of Examples 1 to 19 were produced by dispersing treatment using a bead mill in a state in which the additive particles, the dispersant, and the solvent were mixed in the coating liquid preparation step, and thus the agglomerates that adversely affect the haze were small as compared with Comparative Examples 2 to 14 in which the dispersing treatment was performed by stirring alone. Therefore, in the laminated film 660 having the adhesive layer produced by dispersing treatment using a bead mill and the method for producing the same, various particles capable of exhibiting high functions can be added without adversely affecting the haze.

[1092] In addition, in the laminated films of Examples 1 to 18, not only the haze ratio was 1.10 or less, but also the visibility, the odor, and the strength were all favorably evaluated. Example 19 in which the dispersing treatment was performed using a bead mill, the haze ratio was 1.10 or less, and the particle amount was 0.8 mass% did not obtain favorable evaluations in the odor and the strength. It is considered that this is because the particle amount was small, and thus the reduction of the odor and the strength assurance were insufficient.

[1093] On the other hand, in Comparative Example 15 in which the dispersing treatment was performed using a bead mill in a state in which the additive particles, the dispersant, and the solvent were mixed in the coating liquid preparation step, but the particle amount exceeded 10 mass%, the visibility did not obtain a favorable evaluation. In addition, in Comparative Examples 16 and 17 in which the dispersing treatment was performed using a bead mill in a state in which the additive particles, the dispersant, and the solvent were mixed in the coating liquid preparation step, but the average particle diameter of the additive particles exceeded 50 nm, the visibility was not favorable as compared with Examples 1 to 19, and the haze ratio was not a value satisfying 1.10 or less.

[1094] The packaging bags of each of the examples and the comparative examples had a laminate strength of 11 N / 15 mm width to 12 N / 15 mm width before high-temperature retort treatment, and were substantially equal.

[1095] On the other hand, the laminating strength after the high-temperature cooking treatment was reduced. Specifically, Examples 1 to 18 were reduced by 3 N / 15 mm width.

[1096] In addition, Example 19 was reduced by 5 N / 15 mm width.

[1097] Comparative Example 1, which did not contain the additive particles, was reduced by 2 N / 15 mm width, and Comparative Examples 2 to 17 were reduced by 3 N / 15 mm width to 8 N / 15 mm width.

[1098] As a result, it was found that the more the amount of the particles in the adhesive layer increased, the more the laminating strength tended to be reduced.

[1099] [Method of Evaluation and Evaluation Criteria]

[1100] The visibility, the high-temperature cooking odor, the laminating strength (before high-temperature cooking), the laminating strength (after high-temperature cooking), and the laminating strength (overall) were evaluated.

[1101] As for the visibility, a case where the haze ratio was 25% or less was judged as "A", a case where the haze ratio was more than 25% and 28% or less was judged as "B", and a case where the haze ratio was more than 28% was judged as "C".

[1102] As for the high-temperature cooking odor ([Table 7] is described as "odor"), a case where the hydrogen sulfide concentration was 0.04 mg / L or less was judged as "A", a case where the hydrogen sulfide concentration was more than 0.04 mg / L and 0.25 mg / L or less was judged as "B", and a case where the hydrogen sulfide concentration was more than 0.25 mg / L was judged as "C".

[1103] As for the laminating strength, a case where the laminating strength after the high-temperature cooking treatment was 7 N / 15 mm width or more was judged as "A", and a case where the laminating strength was less than 7 N / 15 mm width was judged as "B".

[1104] [Overall Evaluation]

[1105] As the overall evaluation, a case where all of the visibility, the high-temperature cooking odor, and the laminating strength (overall) were judged as "A" was judged as the overall evaluation "A", a case where two of them were judged as "A" and one of them was judged as "B" was judged as the overall evaluation "B", and a case where two or more of them were judged as "B" or a case where "C" was included was judged as the overall evaluation "C".

[1106] As shown in [Table 7], the overall evaluation of Examples 1 to 18 was judged as "A", and the overall evaluation of Example 19 was judged as "B". The haze ratio of Examples 1 to 19 was 1.10 or less, and good results were obtained as the visibility.

[1107] The high-temperature cooking odor of Examples 1 to 19 was improved compared to Comparative Example 1, and good results were obtained.

[1108] The laminate strength of Examples 1 to 19 was determined to be "B" or more, and good results were obtained.

[1109] That is, Examples 1 to 19 were good results in terms of visibility, high-temperature cooking odor, and laminate strength, and it was confirmed that effects capable of solving the technical problem of the present application were exhibited.

[1110] In addition, the present application also discloses the following.

[1111] [1] A laminate film which is a laminate film having a light-transmitting portion that transmits visible light in a thickness direction, the laminate film sequentially laminating:

[1112] a base film having a barrier layer;

[1113] an adhesive layer containing an adhesive component and polyvalent metal particles or polyvalent metal compound particles mixed in the adhesive component; and

[1114] a sealant layer,

[1115] In the light-transmitting portion, the haze measured according to the haze measurement method stipulated in JIS-K-7136 is 25% or less.

[1116] [2] The laminate film according to the above [1], wherein the ratio of the solid content of the above polyvalent metal particles or the above polyvalent metal compound particles to the total mass of the solid content of the above polyvalent metal particles or the above polyvalent metal compound particles and the solid content of the adhesive in the above adhesive layer is 0.5 mass% or more and 10 mass% or less.

[1117] [3] The laminate film according to the above [1] or [2], wherein the average particle diameter of the above polyvalent metal particles or the above polyvalent metal compound particles is 10 nm or more and 50 nm or less.

[1118] [4] The laminate film according to any one of the above [1] to [3], wherein, in the above adhesive layer, the distribution of the aggregates formed by the above polyvalent metal particles or the above polyvalent metal compound particles is such that the number of aggregates of 10% or more and 200% or less of the above average particle diameter existing within a 50 pm rectangular region in the width direction is 50 or more.

[1119] [5] The laminate film according to any one of the above [1] to [4], wherein, in the above adhesive layer, the average diameter of the aggregates formed by the above polyvalent metal particles or the above polyvalent metal compound particles, as observed from a direction orthogonal to the above thickness direction, is 20 nm or more and 120 nm or less.

[1120] [6] The laminated film according to any one of the above [1] to [5], wherein the specific surface area of the multivalent metal particles or the multivalent metal compound particles is 1 m 2 / g or more.

[1121] [7] The laminated film according to any one of the above [1] to [6], wherein the adhesive layer further contains a dispersant that disperses the multivalent metal p...

Claims

1. A laminated membrane, wherein the following components are stacked sequentially: The specified layers; An adhesive layer comprising an adhesive component and polyvalent metal particles or polyvalent metal compound particles mixed in the adhesive component; and sealant layer, The maximum diameter of the aggregate is less than 14.0 times the minimum diameter of the aggregate formed by the multivalent metal particles or the multivalent metal compound particles.

2. The laminated film according to claim 1, wherein, The average diameter of the aggregate is less than 150 nm.

3. The laminated film according to claim 1 or 2, wherein, The number of aggregates in the aggregate that are 10 to 200% of the average particle size is more than 60.

4. The laminated film according to claim 1 or 2, wherein, There were no aggregates with a diameter greater than 3.0 μm.

5. The laminated film according to claim 1 or 2, wherein, Regarding the condensate with a diameter equal to that of the average condensate, the distance between condensates, which is the average distance between adjacent condensates, is 3.0 μm or less.

6. The laminated film according to claim 1 or 2, wherein, The specified layer is a substrate film with a barrier layer.

7. The laminated film according to claim 6, wherein, The substrate film has a nylon layer.

8. The laminated film according to claim 1 or 2, wherein, The adhesive layer contains 0.5% by mass and 10% by mass of the polyvalent metal particles or the polyvalent metal compound particles.

9. The laminated film according to claim 1 or 2, wherein, The average particle size of the polyvalent metal particles or the polyvalent metal compound particles is greater than 10 nm and less than 45 nm.

10. The laminated film according to claim 1 or 2, wherein, The specific surface area of ​​the polyvalent metal particles or the polyvalent metal compound particles is 1 m². 2 / g or more.

11. The laminated film according to claim 1 or 2, wherein, The adhesive layer further includes a dispersant that disperses the multivalent metal particles or the multivalent metal compound particles in the adhesive components.

12. The laminated film according to claim 1 or 2, wherein, The adhesive component is a cured product of a two-component curing adhesive.

13. The laminated film according to claim 1, wherein, In the adhesive layer, the number of aggregates formed by the multivalent metal particles or the multivalent metal compound particles within a range of 500μm×500μm is 30 or less, and the number of aggregates larger than 9μm is 30 or less.

14. The laminated film according to claim 13, wherein, The inter-cluster distance is greater than 100 μm.

15. The laminated film according to claim 13 or 14, wherein, The specified layer is a substrate film with a barrier layer.

16. The laminated film according to claim 15, wherein, The substrate film has a nylon layer.

17. The laminated film according to claim 13 or 14, wherein, The adhesive layer contains 0.5% by mass and 10% by mass of the polyvalent metal particles or the polyvalent metal compound particles.

18. The laminated film according to claim 13 or 14, wherein, The average particle size of the polyvalent metal particles or the polyvalent metal compound particles is greater than 10 nm and less than 45 nm.

19. The laminated film according to claim 13 or 14, wherein, The specific surface area of ​​the polyvalent metal particles or the polyvalent metal compound particles is 1 m². 2 / g or more.

20. The laminated film according to claim 13 or 14, wherein, The adhesive layer further includes a dispersant that disperses the multivalent metal particles or the multivalent metal compound particles in the adhesive components.

21. The laminated film according to claim 13 or 14, wherein, The adhesive component is a cured product of a two-component curing adhesive.

22. The laminated film according to claim 1, It has a light-transmitting portion in the thickness direction that allows visible light to pass through. The specified layer is a substrate film with a barrier layer. In the light-transmitting portion, the ratio of the haze measured according to the haze measurement method specified in JIS-K-7136 to the haze measured by the same method in the light-transmitting portion when the adhesive layer does not contain the polyvalent metal particles and the polyvalent metal compound particles is 1.10 or less.

23. The laminated film according to claim 22, wherein, The ratio of the solid content of the polyvalent metal particles or the polyvalent metal compound particles to the total mass of the solid content of the polyvalent metal particles or the polyvalent metal compound particles and the solid content of the adhesive in the adhesive layer is more than 0.5% by mass and less than 10% by mass.

24. The laminated film according to claim 22 or 23, wherein, The average particle size of the polyvalent metal particles or the polyvalent metal compound particles is greater than 10 nm and less than 50 nm.

25. The laminated film according to claim 24, wherein, In the adhesive layer, the distribution of the aggregates formed by the multivalent metal particles or the multivalent metal compound particles is such that the number of aggregates existing in a 50 μm rectangular region in the width direction that are more than 10% and less than 200% of the average particle size is more than 50.

26. The laminated film according to claim 22 or 23, wherein, In the adhesive layer, the average diameter of the aggregates formed by the multivalent metal particles or the multivalent metal compound particles, as observed from a direction orthogonal to the thickness direction, is more than 20 nm and less than 120 nm.

27. The laminated film according to claim 22 or 23, wherein, The specific surface area of ​​the polyvalent metal particles or the polyvalent metal compound particles is 1 m². 2 / g or more.

28. The laminated film according to claim 22 or 23, wherein, The adhesive layer further includes a dispersant that disperses the multivalent metal particles or the multivalent metal compound particles in the adhesive components.

29. The laminated film according to claim 22 or 23, wherein, The adhesive component is a cured product of a two-component curing adhesive.

30. The laminated film according to claim 22 or 23, wherein, In the adhesive layer, the maximum diameter of the aggregate formed by the multivalent metal particles or the multivalent metal compound particles, as observed from a direction orthogonal to the thickness direction, is less than 1.0 μm.

31. The laminated film according to claim 22 or 23, wherein, The substrate film has a nylon layer.

32. A packaging bag, which is a packaging bag made of adhesive film, wherein, The membrane comprises a laminated membrane according to any one of claims 1 to 31.

33. A packaging body comprising the packaging bag of claim 32 and the packaged item contained in the packaging bag.

34. The packaging body according to claim 33, wherein, The packaged item contains sulfur compounds.

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