Alcohol-resistant laminate film for packaging materials and method for manufacturing the same, alcohol-resistant packaging

Abstract

To provide a laminate film for an alcohol resistant packaging material that exhibits excellent alcohol resistance without metal foil, furthermore, to provide a manufacturing method of the laminate film and a package using the laminate film.SOLUTION: A laminate film for an alcohol resistance packaging material is characterized that the laminate film has no metal foil, the laminate film has a base material layer 2 and a sealant layer 3, and the base material layer comprises a layer 21 made of a polyester resin having a silica vapor-deposited film 22.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] This invention relates to an alcohol-resistant laminate film for packaging materials and a method for producing the same. It also relates to an alcohol-resistant packaging in which the alcohol-resistant laminate film is used. [Background technology]

[0002] Laminating films used for sealing alcohol-containing products require various functions, but among them, alcohol resistance (the ability to prevent alcohol evaporation) is particularly necessary.

[0003] Patent Document 1 relates to an alcohol-resistant laminate (alcohol-resistant laminate film for packaging materials in the present invention) in which peeling of the interface between the metal foil layer and the adhesive layer can be suppressed by alcohol (Patent Document 1

[0013] ). Patent Document 1 discloses a laminate having, in this order, a base resin layer, a base adhesive layer, a metal foil layer, a first adhesive layer, a barrier layer other than the metal foil layer, a second adhesive layer, and a sealant layer (Patent Document 1 [Claim 1]).

[0004] Patent Document 2 relates to an alcohol-resistant laminate (alcohol-resistant laminate film for packaging materials in the present invention) that can suppress peeling at the interface between the inorganic barrier layer and the adhesive layer due to alcohol (Patent Document 2

[0013] ). Patent Document 2 discloses a laminate having a base resin layer, an inorganic barrier layer, a first urethane adhesive layer, a second urethane adhesive layer, and a sealant layer in that order (Patent Document 2 [Claim 1]). [Prior art documents] [Patent Documents]

[0005] [Patent Document 1] Japanese Patent Publication No. 2020-192769 [Patent Document 1] Japanese Patent Publication No. 2020-152078 [Overview of the project] [Problems that the invention aims to solve]

[0006] The laminate described in Patent Document 1 has a metal foil layer and therefore has high alcohol resistance. As described in Patent Document 1, it is essential to include a metal foil layer in order to obtain a laminate film for packaging materials that has high alcohol resistance. On the other hand, in recent years, there has been a growing demand for easily recyclable products, such as monomaterial products made from the same material, from an environmental perspective. Therefore, there is a need for metal foil-free, alcohol-resistant laminate films for packaging materials.

[0007] The laminate described in Patent Document 2 can use a metal foil layer, a vapor-deposited film layer, etc., as the inorganic barrier layer, and it is stated that using a metal foil layer is preferable from the viewpoint of barrier properties (Patent Document 2

[0023] ). As described in Patent Document 2, even if a vapor-deposited film or the like could be used as a barrier layer for an alcohol-resistant laminate, it was generally preferred to use a metal foil layer from the standpoint of barrier properties.

[0008] Therefore, the present invention aims to provide a laminate film for packaging materials that has excellent alcohol resistance without the presence of metal foil. Furthermore, it aims to provide a method for manufacturing the laminate film and a package using the laminate film. [Means for solving the problem]

[0009] In other words, the present invention is (1) A laminate film for alcohol-resistant packaging materials, The aforementioned laminate film does not have a metal foil, The laminate film has a base layer and a sealant layer, The substrate layer comprises a layer made of polyester resin having a silica vapor-deposited film. A laminate film for packaging materials characterized by the following features; (2) The laminate film for the alcohol-resistant packaging material has a surface layer, the base material layer, and the sealant layer in this order, wherein the surface layer is a layer made of a thermoplastic resin, and the laminate film for the alcohol-resistant packaging material according to (1) is characterized thereby; (3) The laminate film for the alcohol-resistant packaging material according to (2), wherein the silica vapor deposition film of the base material layer is disposed on the surface layer side; (4) The laminate film for the alcohol-resistant packaging material according to (1) or (2), wherein each layer is laminated via an adhesive; (5) The laminate film for the alcohol-resistant packaging material according to (1) or (2), wherein the base material layer has a coating film on the silica vapor deposition film; (6) The laminate film for the alcohol-resistant packaging material according to any one of (1) or (2), wherein the sealant layer includes a vapor deposition film; (7) A method for manufacturing the laminate film for the alcohol-resistant packaging material according to (2) or (3), comprising a step 1 of providing an adhesive between the surface layer and the silica vapor deposition film of the base material layer, and a step 2 of providing an adhesive between the base material layer and the sealant layer, wherein in the step 1, after a coating step of applying an adhesive to the surface layer, the adhesive is provided through a bonding step of bonding the surface layer and the silica vapor deposition film of the base material layer, and the method for manufacturing the laminate film for the alcohol-resistant packaging material is characterized thereby; (8) An alcohol-resistant package formed by bagging the laminate film for the alcohol-resistant packaging material according to any one of (1) to (3), wherein a content containing alcohol is enclosed, and the alcohol-resistant package is characterized thereby; which is the gist thereof.

Advantages of the Invention

[0010] The present invention can provide a laminate film for an alcohol-resistant packaging material that has excellent alcohol resistance and is easy to recycle in the recycling process because it does not have a metal foil layer.

Brief Description of the Drawings

[0011] [Figure 1] It is a schematic cross-sectional view showing an embodiment of the laminate film for an alcohol-resistant packaging material according to the present invention. [Figure 2] It is a schematic cross-sectional view showing another embodiment of the laminate film for an alcohol-resistant packaging material according to the present invention. [Figure 3] It is a schematic cross-sectional view showing another embodiment of the laminate film for an alcohol-resistant packaging material according to the present invention. [Figure 4] It is a schematic cross-sectional view showing another embodiment of the laminate film for an alcohol-resistant packaging material according to the present invention.

Modes for Carrying Out the Invention

[0012] Hereinafter, the present invention will be described in detail, but the present invention is not limited thereto, and various forms can be adopted as long as the gist of the present invention is not exceeded and the same effects can be achieved.

[0013] In this specification, the terms "seal layer" and "sealant layer" are distinguished. First, the "seal layer" refers to a layer that melts by heat and seals when the laminate film is heat-sealed to form a bag. The "sealant layer" refers to a layer including the seal layer and the vapor deposition film provided on the seal layer. However, when the sealant layer does not have a vapor deposition film, it refers to only the seal layer.

[0014] [Laminate Film for Alcohol-Resistant Packaging Material] The laminate film for an alcohol-resistant packaging material (hereinafter, laminate film) in the present invention is characterized in that it does not have an essential metal foil as a laminate film for packaging alcohol-containing substances.

[0015] The laminate film in the present invention comprises at least a base layer and a sealant layer, wherein the base layer is made of a polyester resin having a silica vapor-deposited film.

[0016] In this specification, the term "substrate layer" may also be described as "layer made of silica vapor-deposited film / polyester resin" or "layer made of polyester resin / silica vapor-deposited film".

[0017] A typical configuration of the laminate film of the present invention is (I) a layer made of polyester resin / silica vapor-deposited film / adhesive layer / sealant layer.

[0018] Figure 1 is a schematic cross-sectional view showing a typical configuration of the laminate film of the present invention: (I) a layer 21 made of polyester resin / silica vapor-deposited film 22 / adhesive layer 4 / sealant layer 3.

[0019] The laminate film of the present invention will be described in detail below with reference to the drawings, but the present invention is not limited thereto and can take various forms within the scope of achieving similar effects.

[0020] As shown in Figure 1, it is preferable that the silica vapor-deposited film 22 is positioned facing the sealant layer 3. This arrangement prevents the silica vapor-deposited film 22 from being damaged from the outside, resulting in a laminate film 1 with high alcohol resistance.

[0021] Figure 2 is a schematic cross-sectional view showing a derivative configuration (Configuration (II)) of a typical configuration (I) of the laminate film of the present invention, and is a schematic cross-sectional view showing a surface layer 5 / adhesive layer 4 / silica vapor-deposited film 22 / layer 21 made of polyester resin / adhesive layer 4 / sealant layer 3.

[0022] As shown in Figure 2, by providing a surface layer 5 on the silica vapor-deposited film 22, it is possible to create a laminate film 1 with high alcohol resistance even when printing is performed on the laminate film 1. This is because applying the printing process to the surface layer 5 prevents damage to the silica vapor-deposited film 22 caused by the printing process. Furthermore, by providing the surface layer 5, the silica vapor-deposited film 22 is not subjected to external damage, resulting in a laminate film with high alcohol resistance. Furthermore, as will be described in detail later in the [Method for Manufacturing Alcohol-Resistant Laminate Film for Packaging], the adhesive layer 4 between the surface layer 5 and the silica vapor-deposited film 22 can be formed by applying an adhesive to the surface layer 5, thereby creating a laminate film 1 with high alcohol resistance. This is because, after applying the adhesive to the surface layer 5, it is bonded to the side with the silica vapor-deposited film 22, preventing damage to the silica vapor-deposited film 22 from the adhesive.

[0023] Figure 3 is a schematic cross-sectional view showing a derivative configuration (Configuration (III)) of a typical configuration (I) of the laminate film of the present invention, and is composed in the following order: polyester resin layer 21 / silica vapor-deposited film 22 / adhesive layer 4 / vapor-deposited film 32 / sealing layer 31.

[0024] The difference between configuration (III) and configuration (I) is that the sealant layer 3 consists of a seal layer 31 with a vapor-deposited film 32. Thus, since configuration (III) has two vapor-deposited films (silica vapor-deposited film 22 and vapor-deposited film 32), it has alcohol resistance comparable to that of a laminate film with a metal foil layer, even without a metal foil layer.

[0025] Furthermore, as shown in Figure 3, it is preferable that the silica vapor-deposited film 22 of the substrate layer 2 and the vapor-deposited film 32 of the sealant layer 3 are arranged to face each other. With this arrangement, the vapor-deposited film is not exposed to the outside. Therefore, the vapor-deposited film is not damaged from the outside, and a laminate film with high alcohol resistance can be made.

[0026] Figure 4 is a schematic cross-sectional view showing a derived configuration (configuration (IV)) of configuration (II), and is composed in the following order: surface layer 5 / adhesive layer 4 / silica vapor-deposited film 22 / layer 21 made of polyester resin / adhesive layer 4 / vapor-deposited film 32 / seal layer 31.

[0027] The difference between configuration (IV) and configuration (II) is that the sealant layer 3 consists of a seal layer 31 with a vapor-deposited film 32. Thus, since configuration (IV) has two vapor-deposited films (silica vapor-deposited film 22 and vapor-deposited film 32), it has alcohol resistance comparable to that of a laminate film with a metal foil layer, even without a metal foil layer.

[0028] Furthermore, as shown in Figure 4, it is preferable that the vapor-deposited film 32 of the sealant layer 3 is positioned opposite the substrate layer 2. This arrangement prevents the vapor-deposited film 32 from being damaged from the outside, resulting in a laminate film with high alcohol resistance.

[0029] [Base material layer] The base layer comprises a layer made of polyester resin having a silica vapor-deposited film. Preferably, a coating film is also present on the silica vapor-deposited film, if necessary.

[0030] When a coating film is present, the substrate layer is preferably composed of a polyester resin layer, a silica vapor-deposited film, and a coating film in that order. With this configuration, when printing is performed on the substrate layer, printing is performed on the coating film, resulting in good print quality, and in particular enabling solid white printing.

[0031] The silica vapor-deposited film of the substrate layer may be provided on only one side of the layer made of polyester resin, or on both sides, and is not particularly limited.

[0032] The water vapor permeability of the substrate layer is 1.0 g / (m²). 2 d) Preferably less than or equal to 0.5 / (m 2 • d) It is even more preferable that it be less than or equal to 1.0 cc / (m³). Also, the oxygen permeability should be 1.0 cc / (m³). 2d) Preferably less than or equal to 0.5 cc / (m 2 d) It is even more preferable that the values ​​be less than or equal to the following. Furthermore, the measurement of water vapor transmission shall be based on JIS Z 7129, and the measurement of oxygen transmission shall be based on JIS K 7126-2.

[0033] The water vapor permeability of the substrate layer is 1.0 g / (m²). 2 d) Below, the oxygen permeability is 1.0 cc / (m³). 2 d) Examples of plastic films that meet the following criteria include plastic films manufactured by Mitsubishi Chemical (product name: Techbarrier).

[0034] The base layer may be treated with tear-resistant or antistatic treatments as needed. In addition to the polyester resin layer, silica vapor-deposited film, and coating film, the base layer may also include other layers as needed.

[0035] (A layer made of polyester resin) The layer made of polyester resin may be any layer that contains polyester resin as its main component, and may also contain resin components other than polyester resin.

[0036] The term "main component resin" refers to the resin that makes up the largest proportion of the resins constituting the polyester layer. For example, it refers to the resin that accounts for 50% or more by mass, especially 70% or more by mass, and among those, 80% or more by mass (including 100% by mass) of the resins constituting the polyester film.

[0037] The polyester resin may be either homopolyester or copolymer polyester. Typical polyester resins include polyethylene terephthalate resin, polybutylene terephthalate resin, and polyethylene naphthalate resin. Among these, polyethylene terephthalate is particularly preferred due to its excellent alcohol resistance, printability, mechanical strength, and versatility.

[0038] Furthermore, the polyester resin layer can be formed from a mixture of multiple polyester resins, or it can be a multilayer structure formed by laminating multiple polyester resins.

[0039] The polyester resin layer may be stretched or unstretched, and is not particularly limited; however, from the viewpoint of heat resistance and impact resistance, it is preferable that the layer be biaxially stretched.

[0040] The polyester resin layer is most preferably made of biaxially oriented polyethylene terephthalate, in terms of processability, heat resistance, and impact resistance.

[0041] The thickness of the polyester resin layer is not particularly limited, but is usually in the range of 5 to 300 μm, and preferably 10 to 50 μm. A thickness of 5 μm or more is preferable because it provides good mechanical strength and alcohol resistance, while a thickness of 300 μm or less is preferable because it provides good flexibility and improves handling.

[0042] (Silica vapor-deposited film) The vapor-deposited film of the substrate layer is characterized by the selection of a silica vapor-deposited film from among various vapor-deposited films such as silica vapor-deposited films, aluminum vapor-deposited films, and alumina vapor-deposited films. As shown in the examples described later, by using a silica vapor-deposited film for the substrate layer, it is possible to create a laminate film with the best alcohol resistance.

[0043] The thickness of the silica vapor-deposited film is not particularly limited, but is usually in the range of 0.01 to 1 μm, and preferably 0.01 to 0.5 μm. A thickness of 0.01 μm or more provides good alcohol resistance, while a thickness of 1 μm provides good transparency and flexibility.

[0044] The silica particles used in silica vapor-deposited films are not particularly limited. Their shape can be spherical, lumpy, rod-shaped, flattened, or any other shape. Furthermore, there are no particular restrictions on the hardness, specific gravity, color, etc., of the particles. Two or more types of particles may be used in combination as needed, and those skilled in the art can appropriately determine suitable values.

[0045] The average particle size is not particularly limited, but is preferably in the range of 0.01 to 5 μm, and more preferably 0.01 to 3 μm. Within that range, it is even more preferably 0.5 to 2.5 μm. If it exceeds 5 μm, the surface roughness of the substrate film becomes too rough, which may cause problems when forming various surface functional layers in subsequent processes.

[0046] (Coating film) By applying a coating film on the silica vapor-deposited film of the base layer, a laminate film with even higher alcohol resistance can be created. This is because the coating film protects the silica vapor-deposited film. Furthermore, since the coating film has printability, printing on the coating film results in good print quality, and solid white printing becomes possible.

[0047] The coating film is not particularly limited, but examples include polyurethane resins such as polyurethane resin, polyurethane urea resin, acrylic-modified urethane resin, and acrylic-modified urethane urea resin; vinyl chloride-vinyl acetate copolymer resins; rosin-based resins such as rosin-modified maleic acid resin; polyamide resins; polyester resins; chlorinated olefin resins such as chlorinated polypropylene resin, polyethyleneimine resins, polybutadiene resins, and organotitanium resins. These resins can be dissolved in solvents such as water, methanol, ethanol, 2-propanol, ethyl acetate, methyl ethyl ketone, and toluene, and then applied by gravure or roll coating to form a coating film.

[0048] The thickness of the coating film is not particularly limited, but is usually in the range of 0.005 to 5 μm, and preferably 0.01 to 3 μm. A thickness of 0.005 μm or more is preferable because it allows for a uniform thickness and sufficient adhesion.

[0049] [Sealant layer] The sealant layer refers to a layer that includes a seal layer and a vapor-deposited film provided on the seal layer. However, if the sealant layer does not have a vapor-deposited film, it refers to the seal layer alone.

[0050] (Seal layer) The sealing layer can be the same as the sealant layer commonly used in laminate films for alcohol-resistant packaging materials. Examples include polyester resins and polyolefin resins. Among these, polyester resins are preferred. By using polyester resins for both the sealing layer and the base layer, a laminate film made of a single resin can be produced, making it suitable for recycling. Furthermore, polyester resins have particularly excellent alcohol resistance compared to other resins.

[0051] Specific examples of polyester resins include homopolyethylene terephthalate resins, homopolybutylene terephthalate resins, and glycol-modified polyethylene terephthalate (PETG) resins, which are copolymer polyethylene terephthalate resins. However, there are no particular limitations as long as the resin has sealing properties.

[0052] Specific examples of polyolefin resins include low-density polyethylene, medium-density polyethylene, high-density polyethylene, linear low-density polyethylene, ethylene-vinyl acetate copolymer, polypropylene, propylene-ethylene copolymer, and polybutene. Among polyolefin resins, polypropylene and high-density polyethylene are preferred due to their excellent alcohol resistance.

[0053] Furthermore, the sealing layer can be formed from a layer of mixed resins, or it can be a multilayer sealing layer formed by laminating multiple resins.

[0054] When polyethylene terephthalate is used in the sealing layer, it is preferable to use polyethylene terephthalate that has good sealing properties at low temperatures. For example, it is preferable that the sealing strength at 140°C (sealing conditions: 0.2 MPa, 2 seconds) is 10 N / 15 mm or more.

[0055] The sealing layer may contain various additives such as antioxidants, tackifiers, fillers, and other additives as needed.

[0056] The thickness of the seal layer is not particularly limited, but is preferably 5 to 100 μm, and more preferably 10 to 30 μm. A thickness of 5 μm or more provides good sealing performance, while a thickness of 100 μm or less provides good flexibility. Furthermore, a thickness of 30 μm or less is particularly preferable because it can prevent alcohol from evaporating from the edges of the seal layer.

[0057] (Vaporized film) The sealant layer preferably includes a vapor-deposited film. The presence of a vapor-deposited film provides the laminate film with high alcohol resistance.

[0058] Examples of vapor-deposited films include aluminum vapor-deposited films, alumina vapor-deposited films, silica vapor-deposited films, and binary vapor-deposited films of silica and alumina, but among these, aluminum vapor-deposited films are particularly preferred. Using an aluminum vapor-deposited film allows for the creation of a laminate film with excellent alcohol resistance.

[0059] The thickness of the deposited film is not particularly limited, but is usually in the range of 0.1 to 1 μm, and preferably 0.01 to 0.5 μm. A thickness of 0.01 μm or more provides good alcohol resistance, while a thickness of 1 μm provides good transparency and flexibility.

[0060] [Surface layer] The laminate film of the present invention may be provided with a surface layer as needed. By providing a surface layer, the laminate film can be made to have high alcohol resistance even when printing is performed on the laminate film. This is because printing on the surface layer prevents damage to the silica vapor-deposited film caused by the printing process. Furthermore, by providing a surface layer, the silica vapor-deposited film is not subjected to external damage, resulting in a laminate film with high alcohol resistance.

[0061] The surface layer is not particularly limited, but is preferably a layer made of a thermoplastic resin. Examples of thermoplastic resins include low-density polyethylene resin, high-density polyethylene resin, linear low-density polyethylene resin, polyolefin resins such as polypropylene resin and ethylene-α-olefin copolymer resin, polyester resins such as polyethylene terephthalate resin and polybutylene terephthalate resin, ethylene-vinyl alcohol copolymer resin, polymethyl methacrylate resin, ethylene-vinyl acetate copolymer resin, ionomer resin, polybutene resin, nylon resin, polyamide resin, polystyrene resin, and polycarbonate resin. Among these, polyethylene terephthalate resin is particularly preferred. Using polyethylene terephthalate allows for the creation of a laminate film with excellent alcohol resistance, printability, heat resistance, and pitch characteristics.

[0062] The surface layer can be formed from a layer of the thermoplastic resins listed above, or it can be a multilayer structure formed by laminating multiple thermoplastic resins.

[0063] The thickness of the surface layer is not particularly limited, but is usually in the range of 5 to 100 μm, preferably 10 to 50 μm. A thickness of 5 μm or more provides sufficient protection for the silica vapor-deposited film, preventing external damage. A thickness of 200 μm or less provides good flexibility.

[0064] [Adhesive layer] An adhesive layer can be provided as needed, and it is preferable to provide it between each layer as shown in Figures 1 to 4.

[0065] While there are no particular restrictions on the adhesive layer, a laminate film similar to those commonly used as alcohol-resistant packaging laminate films can be appropriately adopted.

[0066] Specifically, for example, polyvinyl acetate adhesives, polyacrylic acid ester adhesives, cyanoacrylate adhesives, ethylene copolymer adhesives, cellulose adhesives, polyester adhesives, polyether adhesives, polyamide adhesives, polyimide adhesives, amino resin adhesives, phenolic resin adhesives, epoxy adhesives, urethane adhesives, rubber adhesives, and silicone adhesives can be used.

[0067] Furthermore, the adhesive layer can also be formed by mixing the multiple adhesives listed above.

[0068] Furthermore, the adhesive in this invention includes dry laminating adhesives, anchor coating agents, primers, and the like.

[0069] [printing] The laminate film of the present invention can be printed as needed. The areas to be printed are not particularly limited, but for example, when printing is applied to a typical configuration (I) of the laminate film of the present invention, the printing can be applied between the substrate layer and the sealant layer. If a coating layer is provided on the silica vapor-deposited film of the substrate layer, the printing can be applied on the coating layer.

[0070] Furthermore, when printing is applied to the laminate film of configuration (II), the printing can be applied to the surface layer. By printing on the surface layer, it is possible to create a laminate film with high alcohol resistance without damaging the silica vapor-deposited film.

[0071] [Method for manufacturing alcohol-resistant laminate film for packaging materials] A typical configuration of the laminate film of the present invention (I) When manufacturing a layer made of polyester resin / silica vapor-deposited film / adhesive layer / sealant layer, it is preferable to include a coating step of applying an adhesive to the surface of the substrate layer having the silica vapor-deposited film or to the sealant layer, and a bonding step of bonding the surface of the substrate layer having the silica vapor-deposited film and the sealant layer via the adhesive.

[0072] A typical configuration of the laminate film of the present invention (II) When manufacturing a laminate film consisting of a surface layer / adhesive layer / silica vapor-deposited film / polyester resin layer / adhesive layer / sealant layer, it is preferable to include a step 1 of providing an adhesive between the surface layer and the silica vapor-deposited film of the base layer, and a step 2 of providing an adhesive between the base layer and the sealant layer. Furthermore, it is particularly preferable that in step 1, after a coating step of applying the adhesive to the surface layer, the adhesive is provided through a bonding step of bonding the surface layer and the silica vapor-deposited film of the base layer.

[0073] In step 1, by applying the adhesive to the surface layer rather than the side of the substrate layer with the silica vapor-deposited film, it is possible to create a laminate film with excellent alcohol resistance without damaging the silica vapor-deposited film with the adhesive (specifically, damage caused by the application of the adhesive using a gravure roll, etc.).

[0074] Hereafter, the surface with a vapor-deposited film will be referred to as the vapor-deposited surface, and the surface without a vapor-deposited film will be referred to as the non-vapor-deposited surface.

[0075] As described in step 1 above, when a vapor-deposited surface and a non-vapor-deposited surface are provided via an adhesive, it is preferable to apply the adhesive to the non-vapor-deposited surface and then bond the non-vapor-deposited surface and the vapor-deposited surface together. Since the laminate film produced by this manufacturing method does not cause damage to the vapor-deposited film by the adhesive (specifically, damage during adhesive application by gravure rolls, etc.), it is possible to produce a laminate film with excellent alcohol resistance.

[0076] [Alcohol-resistant packaging] When manufacturing packaging for alcohol-containing substances using the laminate film of the present invention, the sealant layer can be positioned on the inner surface of the bag, and the bag can be manufactured by heat sealing.

[0077] The type of bag is not particularly limited; for example, flat bags such as three-sided sealed bags, four-sided sealed bags, or pillow-type bags, as well as self-standing bags such as standing pouches, and even gusseted bags, are all acceptable.

[0078] [Contents] The laminate film of the present invention can be suitably used as a packaging material for packaging contents containing alcohol.

[0079] Alcohols are not particularly limited and include monohydric alcohols such as methyl alcohol, ethyl alcohol, propyl alcohol (including various isomers), butyl alcohol, and amyl alcohol, as well as polyhydric alcohols such as ethylene glycol, polymethylene glycol, and glycerin.

[0080] Furthermore, while there are no particular restrictions on the alcohol concentration of the contents, for example, if the contents are a liquid containing alcohol, it is usually around 10-60%. If the contents are sheets or similar products containing alcohol, it is usually around 10-95%. Depending on the purpose, the contents may also contain other substances besides alcohol.

[0081] Specific examples of contents include alcohol-containing disinfectants, alcohol-impregnated sheets, alcoholic beverages, and alcohol-containing foods. [Examples]

[0082] The present invention will be specifically described by examples and comparative examples, but the present invention is not limited thereto.

[0083] <Example 1> A laminated film with a structure of polyethylene terephthalate / silica vapor deposition film / adhesive layer / aluminum vapor deposition film / polyethylene terephthalate was produced. [Production method] First, an adhesive was applied to the silica vapor deposition film surface of a base material layer (Tech Barrier HX, 12 μm, Mitsubishi Chemical Corporation) composed of polyethylene terephthalate / silica vapor deposition film at an application amount of 3.0 - 4.0 g / m 2 and dried. Next, the aluminum vapor deposition film surface of a sealant layer (VM-HSPET, 20 μm, Oike Pack Material Co., Ltd.) composed of aluminum vapor deposition film / polyethylene terephthalate was bonded to the silica vapor deposition film surface of the base material layer provided with the adhesive so that they faced each other. Then, an aging treatment was performed at a temperature of 40°C for 3 days to obtain a laminated film. The bonding was carried out by hand lamination (all the bonding steps described below were also carried out by hand lamination.).

[0084] < Reference example 2 > A laminated film with a structure of polyethylene terephthalate / adhesive layer / silica vapor deposition film / polyethylene terephthalate / adhesive layer / polypropylene was produced. [Production method] First, an adhesive was applied to the surface layer composed of a polyethylene terephthalate film (12 μm) at an application amount of 3.0 - 4.0 g / m 2 and dried. Next, the silica vapor deposition film surface of a base material layer (Tech Barrier HX, 12 μm, Mitsubishi Chemica l Corporation) composed of silica vapor deposition film / polyethylene terephthalate was bonded to the adhesive surface of the polyethylene terephthalate film provided with the adhesive so that they faced each other. Next, an adhesive was applied to the polyethylene terephthalate side of the base material layer at an application amount of 3.0 - 4.0 g / m and dried. Next, a sealant layer composed of a polypropylene film (P1128, 30 μm, Toyobo Co., Ltd.) was bonded to the adhesive surface of the polyethylene terephthalate film provided with the adhesive so that they faced each other. Next, an adhesive was applied to the polyethylene terephthalate 2 side of the base material layer at an application amount of 3.0 - 4.0 g / m[[ID=�3]] and dried. Next, a sealant layer composed of a polypropylene film (P1128, 30 μm, Toyobo Co., Ltd.) The adhesive surface of the substrate layer with adhesive was bonded together. Then, it was left at a temperature of 40°C for 3 days. A laminate film was obtained by performing an aging process.

[0085] <Example 3> A laminate film was fabricated with the following composition: polyethylene terephthalate / silica vapor-deposited film / adhesive layer / silica + alumina vapor-deposited film / polyethylene terephthalate. [Production method] A laminate film was obtained in the same manner as in Example 1, except that the sealant layer was made of silica-alumina vapor-deposited film / polyethylene terephthalate (Ecosial VE034, 30 μm, Toyobo Co., Ltd.).

[0086] < Reference example 3 > The composition is polyethylene terephthalate / silica vapor-deposited film / adhesive layer / high-density polyethylene. We manufactured the laminating film. [Production method] The sealant layer was made of high-density polyethylene (HS31, 30 μm, Tamapoly Co., Ltd.). A laminate film was obtained in the same manner as in Example 1, except for one other factor.

[0087] < Reference example 4 > Lamination consisting of polyethylene terephthalate / silica vapor-deposited film / adhesive layer / polypropylene We produced a Nate film. [Production method] The sealant layer was made of polypropylene (P1128, 30 μm, Toyobo Co., Ltd.). A laminate film was obtained in the same manner as in Example 1, except for [specific detail].

[0088] <Comparative Example 1> A laminate film was manufactured with the following composition: polyethylene terephthalate / adhesive layer / alumina vapor-deposited film / polyethylene terephthalate / adhesive layer / polypropylene. [Production method] A laminate film was obtained in the same manner as in Example 2, except that the base layer was made of an alumina vapor-deposited film / polyethylene terephthalate (Ecosial VA608, 12 μm, Toyobo Co., Ltd.).

[0089] <Comparative Example 2> A laminate film was fabricated with the following composition: polyethylene terephthalate / alumina vapor-deposited film / adhesive layer / polyethylene terephthalate. [Production method] A laminate film was obtained in the same manner as in Example 1, except that the base layer was made of an alumina vapor-deposited film / polyethylene terephthalate (Ecosial VA608, 12 μm, Toyobo Co., Ltd.) and the sealant layer was made of heat-sealable polyethylene terephthalate (DE046, 30 μm, Toyobo Co., Ltd.).

[0090] <Comparative Example 3> A laminate film was fabricated with the following composition: polyethylene terephthalate / alumina vapor-deposited film / adhesive layer / polyethylene terephthalate. [Production method] A laminate film was obtained in the same manner as in Example 1, except that the base layer was made of an alumina vapor-deposited film / polyethylene terephthalate (Ecosial VA608, 12 μm, Toyobo Co., Ltd.) and the sealant layer was made of heat-sealable polyethylene terephthalate (DE046, 20 μm, Toyobo Co., Ltd.).

[0091] <Comparative Example 4> A laminate film was fabricated with the following composition: polyethylene terephthalate / alumina vapor-deposited film / adhesive layer / high-density polyethylene. [Production method] A laminate film was obtained in the same manner as in Example 1, except that the base layer was made of an alumina vapor-deposited film / polyethylene terephthalate (Ecoseal VA608, 12 μm, Toyobo Co., Ltd.) and the sealant layer was made of high-density polyethylene (HS31, 30 μm, Tamapoly Co., Ltd.).

[0092] <Comparative Example 5> A laminate film was fabricated with the following composition: polyethylene terephthalate / alumina vapor-deposited film / adhesive layer / polypropylene. [Production method] A laminate film was obtained in the same manner as in Example 1, except that the base layer was made of an alumina vapor-deposited film / polyethylene terephthalate (Ecosial VA608, 12 μm, Toyobo Co., Ltd.) and the sealant layer was made of polypropylene (P1128, 30 μm, Toyobo Co., Ltd.).

[0093] Alcohol resistance evaluation The fabricated laminate film was positioned so that the sealant layer faced the inside of the bag, and a bag measuring 90mm x 100mm was manufactured. 10-11g of a 46wt% ethanol aqueous solution was filled into this bag as the liquid content. The bag containing the liquid content was then allowed to decompose at 65°C for 6 days, and the percentage reduction in the liquid content after 6 days was measured. This measurement was repeated twice, and the average weight reduction percentage was calculated and evaluated. The evaluation criteria were: Less than 1.00%: ◎ 1.00% or more and less than 3.00%: ○ 3.00% or more: × That's what I decided.

[0094] Example 1 、3、 Comparative Examples 1-5 and Reference Examples 2-4 Table 1 shows the composition and alcohol resistance evaluation results. (Note: This is a reference example.) 1 The results of a similar test conducted with a laminate film containing metal foil are shown. Reference example 1 Composition: Polyethylene terephthalate (12μm) / Aluminum foil (7μm) / CP (30μm), Bag size: 60mm x 75mm

[0095] [Table 1]

[0096] Water vapor permeability evaluation The manufactured laminate film was subjected to a measurement of the water vapor transmission rate g / m³ based on the JIS K7129 (2019) infrared sensor method. 2 ·d) was measured. The testing device used was MOCON PERMATRAN-W 3 / 34G (Hitachi High-Tech Science Co., Ltd.), but the lower limit of the testing device was 0.1 g / (m 2 • d) Since the value is less than 0.1g / (m 2 If the measurement result was less than d), it was indicated as "<0.1". The evaluation criteria were: 0.1g / (m 2 ·d) Less than: ◎ 0.1g / (m 2 ·d) More than 0.2g / (m 2 •d) Less than: ○ 0.2g / (m 2 ·d) or more: × That's what I decided.

[0097] Example 1, Reference example 2. 4 The composition and water vapor permeability evaluation results for Comparative Example 5 are shown in Table 2.

[0098] [Table 2]

[0099] From Table 1, laminate films having silica vapor-deposited film / PET are alumina vapor-deposited film / P Compared to laminate films with ET, the average weight loss rate (%) is suppressed. This can be understood ( Reference example 3 Comparison with Comparative Example 4, Reference example 4 (and comparison with Comparative Example 5). Also, Using an alumina vapor-deposited film / PET as the sealant layer suppresses the average weight loss rate (%). Therefore, it can be understood that this is the most preferable (Examples 1 and 3) , Reference examples 3 and 4 (Compared to)

[0100] From Table 2, laminate films having silica vapor-deposited film / PET are alumina vapor-deposited film / P Compared to laminate films with ET, the water vapor transmission rate is g / (m³). 2 ·d) is suppressed It can be understood that this is the case (Example 1, Reference example 2. 4 (Comparison with Comparative Example 5). Furthermore, when an alumina vapor-deposited film / PET is used for the sealant layer, the water vapor transmission rate is g / (m). 2 ·d) is suppressed, and it can be understood that this is the most preferable (Example 1 and Reference example 4 (Compared to) [Explanation of Symbols]

[0101] 1. Laminating film 2 Base material layer 21 Layer made of polyester resin 22 Silica vapor-deposited film 3. Sealant layer 31 sealing layer 32 Deposited film 4 Adhesive layer 5 Surface layer

Claims

1. A laminate film for alcohol-resistant packaging materials, The aforementioned laminate film does not have a metal foil, The laminate film has a base layer and a sealant layer, The substrate layer comprises a layer made of polyester resin having a silica vapor-deposited film. The sealant layer comprises a vapor-deposited film. A laminate film for packaging materials that is alcohol-resistant and features the following characteristics.

2. The aforementioned alcohol-resistant packaging laminate film is The surface layer, the substrate layer, and the sealant layer are in this order. The aluminum-resistant Laminating film for collapsible packaging materials.

3. The silica vapor-deposited film of the substrate layer is characterized in that it is arranged on the surface layer side. The alcohol-resistant laminating film for packaging materials described above.

4. The alcohol-resistant material according to claim 1 or 2, characterized in that each layer is laminated with an adhesive in between. Laminating film for packaging materials.

5. The substrate layer is characterized by having a coating film on the silica vapor-deposited film. Or the alcohol-resistant packaging laminate film described in 2.

6. A method for manufacturing an alcohol-resistant laminate film for packaging materials according to claim 2 or 3, Step 1 involves providing an adhesive between the silica vapor-deposited film of the surface layer and the substrate layer, The process includes step 2 of providing an adhesive between the base material layer and the sealant layer, In step 1, after the coating step of applying adhesive to the surface layer, silica vaporization of the surface layer and the substrate layer is performed. Aluminum-resistant material characterized by having an adhesive applied after a bonding process in which a film is bonded to it. A method for manufacturing laminate film for collapsible packaging materials.

7. A laminate film for alcohol-resistant packaging materials according to any one of claims 1 to 3 is made into a bag. It became, An alcohol-resistant packaging material characterized by containing alcohol-based contents.

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