Laminated film and package

Abstract

To provide a laminated film including a base material layer containing a cyclic olefin resin, in which dissolution of the surface of the laminated film is suppressed.SOLUTION: A laminated film comprising: a base material layer containing a cyclic olefin resin; and a first layer provided directly on a surface of the base material layer, wherein the first layer is formed by applying a resin composition (1) containing a binder resin and a solvent, wherein a content of an aromatic hydrocarbon-based solvent in the resin composition (1) is 50% by mass or less.SELECTED DRAWING: None

Description

[Technical Field]

[0001] The present invention relates to a laminated film and a packaging material. [Background technology]

[0002] A packaging format called PTP (Press Through Package) is used for packaging medicines such as tablets and capsules, foods, etc. This PTP package generally consists of a blister container with a recess in a resin sheet for accommodating the packaged item, and an aluminum film that serves as a lid to cover the recess from the back of the blister container after the capsule or the like is accommodated in the recess.

[0003] Before manufacturing PTP-packaged products, pharmaceutical companies conduct trial runs using only PTP packaging materials to check for any defects in the production line. As a result, a certain amount of PTP packaging waste is generated during these trial runs. Although some of this PTP packaging waste is recycled, it is mainly incinerated as industrial waste because it is difficult to separate the resin sheet from the aluminum lid material.

[0004] From the perspective of making effective use of limited resources and reducing greenhouse gas emissions, there is a demand for a blister container with a single resin composition (mono-material) and a lid material that can be separated and recycled.

[0005] From the viewpoint of recyclability, development is underway to replace aluminum films with easily recyclable olefin resin-based unstretched films for PTP packaging lid materials. For example, Patent Document 1 discloses an easily breakable film made of a base material layer containing a cyclic olefin resin as a PTP packaging lid material. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] International Publication No. 2024 / 029377 Summary of the Invention [Problem to be solved by the invention]

[0007] In general, when an olefin resin-based film is used as a lid material for PTP packaging, a printed layer is provided on the surface of the film to impart light-blocking properties or to display a product name, a design, etc. This printed layer is usually formed from a liquid ink composition containing a binder resin, a pigment, an organic solvent, etc.

[0008] In this regard, it has been found that when a printed layer is formed on the easily breakable film disclosed in Patent Document 1 using, for example, a liquid ink composition that uses toluene as a solvent, the cyclic olefin resin on the surface of the easily breakable film may dissolve. Such surface dissolution must be avoided from the viewpoint of appearance as well.

[0009] Therefore, an object of the present invention is to provide a laminate film having a substrate layer containing a cyclic olefin resin, in which dissolution of the surface of the laminate film is suppressed. Another object of the present invention is to provide a package using the above-mentioned laminated film as a lid material. [Means for solving the problem]

[0010] After extensive research, the inventors discovered that the above-mentioned problems can be solved by applying a resin composition containing 50% by mass or less of an aromatic hydrocarbon solvent onto the surface of a substrate layer containing a cyclic olefin resin to form a printed layer, etc., and thus completed the present invention. The gist and configuration of the present invention to solve the above problems is as follows.

[0011] [1] A substrate layer containing a cyclic olefin resin and a first layer provided directly on a surface of the substrate layer, The first layer is formed by applying a resin composition (1) containing a binder resin and a solvent, the resin composition (1) having an aromatic hydrocarbon solvent content of 50 mass% or less. A laminated film characterized by:

[0012] [2] The laminated film according to [1], wherein the first layer is provided directly on one surface of the base material layer and a heat seal layer is provided directly on the other surface of the base material layer, and the ratio of the thickness of the base material layer to the total thickness of the base material layer and the heat seal layer is 40% or more.

[0013] [3] The laminated film according to [1] or [2], wherein the cyclic olefin resin has a glass transition temperature of 60°C or higher.

[0014] [4] The laminated film according to any one of [1] to [3], wherein the solvent includes a solvent selected from an ester-based solvent and an alcohol-based solvent.

[0015] [5] The laminated film according to any one of [1] to [4], further comprising a second layer on the first layer.

[0016] [6] The laminated film according to [5], wherein the second layer is formed by applying a resin composition (2) containing a binder resin and a solvent, the resin composition (2) having an aromatic hydrocarbon solvent content of 50 mass% or less.

[0017] [7] The laminated film according to [2], wherein the substrate layer consists of only a first substrate layer containing the cyclic olefin resin and an inorganic filler, and a second substrate layer containing the cyclic olefin resin but not an inorganic filler.

[0018] [8] The laminated film according to [7], wherein the substrate layer is laminated in the order of the first substrate layer and the second substrate layer from the side in contact with the heat seal layer.

[0019] [9] The laminated film according to [7] or [8], wherein the content of the inorganic filler in the first base layer is 0.1% by mass or more and 10% by mass or less relative to the total mass of the base layer and the heat seal layer.

[0020]

[10] The laminated film according to any one of [1] to [9], which is a lid material for a package.

[0021]

[11] A container having a recess and a lid material, A packaging body, wherein the lid material is the laminated film according to any one of [1] to [9]. [Effects of the Invention]

[0022] According to the present invention, it is possible to provide a laminate film having a substrate layer containing a cyclic olefin resin, in which dissolution of the surface of the laminate film is suppressed. Furthermore, according to the present invention, it is possible to provide a package using the above-mentioned laminated film as a lid material. DETAILED DESCRIPTION OF THE INVENTION

[0023] In this specification, the term "easily breakable" means that the laminated film can be easily broken and torn off when force is applied.

[0024] In this specification, the expression "substantially free of" a certain component includes the case where the component is unavoidably mixed in as an impurity, specifically, the case where the component is contained in a proportion of 0.05% by mass or less.

[0025] The present invention will be described in detail below by way of example based on embodiments thereof.

[0026] <Laminated film> A laminate film according to one embodiment of the present invention (hereinafter sometimes referred to as "the laminate film according to the present embodiment") comprises a substrate layer containing a cyclic olefin resin and a first layer provided directly on the surface of the substrate layer. The laminate film according to the present embodiment is characterized in that the first layer is formed by coating a resin composition (1) containing a binder resin and a solvent, the resin composition (1) having an aromatic hydrocarbon solvent content of 50 mass% or less.

[0027] As a result of intensive research by the present inventors, it was found that the easily breakable film disclosed in Patent Document 1 has no or very low resistance to aromatic hydrocarbon solvents because it contains a cyclic olefin resin in its base layer. Furthermore, it was found that this may cause the cyclic olefin resin on the surface of the easily breakable film to dissolve when a layer such as a printed layer is formed using a composition containing a certain amount or more of an aromatic hydrocarbon solvent. Furthermore, as a result of further intensive research by the present inventors, it was found that when forming a layer such as the printed layer on a base layer containing a cyclic olefin resin, the dissolution can be significantly suppressed by setting the content of the aromatic hydrocarbon solvent in the composition for such formation to 50% by mass or less. Therefore, according to the laminated film of the present embodiment, it is possible to suppress surface dissolution, more specifically, surface dissolution of the cyclic olefin resin contained in the base layer.

[0028] In the laminated film of the present embodiment, the first layer is not limited to a printed layer, and the above-mentioned problems can be solved even if it is one of various functional layers described below.

[0029] The phrase "formed by applying a resin composition (1) containing a binder resin and a solvent, wherein the content of an aromatic hydrocarbon solvent is 50 mass % or less" is used in this specification for the purpose of identifying the laminate film, since it is practically not possible to directly identify the target laminate film by its structure.

[0030] (base material layer) The substrate layer in the laminate film of this embodiment contains a cyclic olefin resin. Such a substrate layer can contain the cyclic olefin resin as a main resin component. The main resin component refers to the resin component with the highest content among the resin components. Furthermore, the substrate layer may contain an olefin resin without a cyclic structure as needed, but preferably does not contain an olefin resin without a cyclic structure.

[0031] The cyclic olefin resin is not particularly limited and can be appropriately selected depending on the purpose. Examples thereof include norbornene polymers, vinyl alicyclic hydrocarbon polymers, and cyclic conjugated diene polymers.

[0032] Examples of norbornene-based polymers include ring-opening polymers of norbornene-based monomers (hereinafter sometimes referred to as "COP"), norbornene-based copolymers (hereinafter sometimes referred to as "COC"), and hydrogenated products of COP and COC.

[0033] The cyclic olefin resin is preferably a norbornene-based polymer, more preferably a hydrogenated product of COP and COC. The weight average molecular weight of the cyclic olefin resin is not particularly limited and can be appropriately selected depending on the purpose, but is preferably 5,000 to 500,000, more preferably 7,000 to 300,000.

[0034] A norbornene polymer is a polymer obtained by polymerizing a norbornene monomer, which is an alicyclic monomer having a norbornene ring. Examples of norbornene-based monomers include norbornene, tetracyclododecene, ethylidenenorbornene, vinylnorbornene, ethylidetetracyclododecene, dicyclopentadiene, dimethanotetrahydrofluorene, phenylnorbornene, methoxycarbonylnorbornene, methoxycarbonyltetracyclododecene, etc. The norbornene-based monomer may contain one type alone or two or more types.

[0035] The norbornene copolymer is a copolymer of a norbornene monomer and an olefin copolymerizable with the norbornene monomer. Examples of olefins copolymerizable with norbornene-based monomers include olefins having 2 to 20 carbon atoms, such as ethylene, propylene, and 1-butene; cycloolefins, such as cyclobutene, cyclopentene, and cyclohexene; and non-conjugated dienes, such as 1,4-hexadiene. The olefin copolymerizable with the norbornene-based monomer may contain one kind alone or two or more kinds.

[0036] The cyclic olefin resin may be a commercially available product or a synthetic product. Commercially available cyclic olefin resins include ring-opening polymers (COP) of norbornene-based monomers, such as "ZEONOR" manufactured by Zeon Corporation; and norbornene-based copolymers (COC), such as "APEL" manufactured by Mitsui Chemicals, Inc. and "TOPAS" manufactured by Polyplastics Co., Ltd.

[0037] The melt volume rate (MVR) of the cyclic olefin resin is not particularly limited and can be appropriately selected depending on the purpose. When measured under the measurement conditions of a temperature of 230°C and a load of 2.16 kg, it is, for example, 1.0 cm 3 / 10 minutes or more, or 2.0 cm 3 / 10 minutes or more is preferable, and for example, 50.0 cm 3 / 10 minutes or less, 20.0cm 3 / 10 minutes or less, 18.0cm 3 / 10 minutes or less, or 15.0 cm 3 When measured under the conditions of a temperature of 260°C and a load of 2.16 kg, the 3 / 10 minutes or more, or 2.0 cm 3 / 10 minutes or more is preferable, and for example, 50.0 cm 3 / 10 minutes or less, 20.0cm 3 / 10 minutes or less, 10.0cm 3 / 10 minutes or less, or 7.0 cm3 / 10 minutes or less is preferable. Here, the melt volume rate (MVR) is a value measured in accordance with JIS K7210.

[0038] The glass transition temperature of the cyclic olefin resin is not particularly limited and can be appropriately selected depending on the purpose, but is preferably 60°C or higher. When the glass transition temperature of the cyclic olefin resin is 60°C or higher, heat resistance can be improved. From the same viewpoint, the glass transition temperature of the cyclic olefin resin is more preferably 75°C or higher.

[0039] The glass transition temperature of the cyclic olefin resin is preferably 200° C. or lower, from the viewpoints of availability and the possibility of production by co-extrusion lamination with other resin layers.

[0040] The substrate layer may contain two or more types of cyclic olefin resins having different glass transition temperatures. Cyclic olefin resins with high glass transition temperatures may have low tensile strength and be easily cut or torn. Taking into consideration the balance between suitability for taking up and winding during slitting and the like, and laminate strength, the balance of physical properties can be adjusted by using a cyclic olefin resin with a high glass transition temperature in combination with a cyclic olefin resin with a low glass transition temperature. The glass transition temperature of the cyclic olefin resin with a high glass transition temperature is preferably 100°C or higher, more preferably 125°C or higher. The glass transition temperature of the cyclic olefin resin with a low glass transition temperature is preferably less than 100°C.

[0041] The glass transition temperature of the cyclic olefin resin can be measured using a differential scanning calorimeter (DSC) (for example, DSC-7020, manufactured by Hitachi High-Tech Science Corporation).

[0042] The base layer in the laminated film of the present embodiment may contain an inorganic filler. The inorganic filler is not particularly limited and can be appropriately selected depending on the purpose. Examples thereof include calcium carbonate, talc, silica, alumina, clay, antimony oxide, aluminum hydroxide, magnesium hydroxide, hydrotalcite, calcium silicate, magnesium oxide, potassium titanate, barium titanate, titanium oxide, calcium oxide, magnesium oxide, manganese dioxide, boron nitride, and aluminum nitride. The inorganic filler may be used alone or in combination of two or more kinds. The inorganic filler is preferably at least one selected from the group consisting of calcium carbonate, silica, alumina, aluminum hydroxide, barium titanate, talc, boron nitride, and aluminum nitride, and more preferably at least one selected from the group consisting of calcium carbonate, alumina, aluminum hydroxide, and talc.

[0043] The particle size, fiber length, fiber diameter, and other shapes of the inorganic filler are not particularly limited and can be appropriately adjusted depending on the intended use. The surface treatment state of the inorganic filler is also not particularly limited, and the surface may be modified with, for example, saturated fatty acid depending on the intended use.

[0044] The average thickness of the base layer is not particularly limited and can be appropriately selected depending on the purpose, but is preferably, for example, 5 μm or more, or 8 μm or more, and is preferably, for example, 40 μm or less, or 36 μm or less.

[0045] The base layer in the laminate film of the present embodiment may be a single layer or may be a plurality of layers. When the base layer is a plurality of layers, each of the plurality of layers contains a cyclic olefin resin.

[0046] When the base layer is a single layer, the content of the cyclic olefin resin having a glass transition temperature of 100°C or higher in the base layer is preferably 50% by mass or more, more preferably 75% by mass or more, and even more preferably 90% by mass or more, from the viewpoints of excellent breakability and rigidity of the laminate film.

[0047] When the base layer is composed of multiple layers, the content of the cyclic olefin resin having a glass transition temperature of 100°C or higher in the base layer is preferably 30% by mass or more, and more preferably 40% by mass or more, in terms of excellent breakability and rigidity of the laminate film.

[0048] When the laminate film of this embodiment includes a heat seal layer described later, the substrate layer is preferably a layer consisting only of a first substrate layer containing a cyclic olefin resin and an inorganic filler, and a second substrate layer containing the cyclic olefin resin but not containing an inorganic filler. By having the substrate layer be a layer consisting only of the first substrate layer containing a cyclic olefin resin and an inorganic filler, and the second substrate layer containing the cyclic olefin resin but not containing an inorganic filler, the printability and coatability of the laminate film are excellent.

[0049] The first base layer is a layer containing a cyclic olefin resin and an inorganic filler. The ratio of the thickness of the first base layer to the total thickness of the base layer and the heat seal layer is not particularly limited and can be appropriately selected depending on the purpose, but is preferably, for example, 10% or more, or 15% or more, and is preferably, for example, 90% or less, or 50% or less.

[0050] The average thickness of the first base layer is not particularly limited and can be selected appropriately depending on the purpose, but is preferably, for example, 2 μm or more, or 2.5 μm or more, and is preferably, for example, 38 μm or less, or 35 μm or less.

[0051] Examples of the inorganic filler in the first layer of the substrate include the same as those mentioned above.

[0052] The content of the inorganic filler in the first base layer is not particularly limited and can be selected appropriately depending on the purpose, but for example, it is preferably 0.1% by mass or more, or 5% by mass or more, relative to the total mass of the base layer and the heat seal layer, and is preferably 10% by mass or less, or 5% by mass or less. When the content of the inorganic filler in the first base layer is 0.1 mass % or more and 10 mass % or less relative to the total mass of the base layer and the heat seal layer, the laminated film has excellent breakability and is also good in terms of barrier properties and film formability.

[0053] The second base layer is a layer containing a cyclic olefin resin and no inorganic filler. The ratio of the thickness of the second base layer to the total thickness of the base layer and the heat seal layer is not particularly limited and can be appropriately selected depending on the purpose, but is preferably, for example, 10% or more, or 15% or more, and, for example, 90% or less, or 80% or less.

[0054] The average thickness of the second substrate layer is not particularly limited and can be selected appropriately depending on the purpose, but is preferably, for example, 2 μm or more, or 2.5 μm or more, and is preferably, for example, 38 μm or less, or 35 μm or less.

[0055] When the laminated film of this embodiment has a first layer provided directly on one side of the base layer and a heat seal layer provided directly on the other side of the base layer (described later), the base layer may be laminated in the order of the first base layer and the second base layer from the side in contact with the heat seal layer.

[0056] The substrate layer may further contain other components as necessary. The other components are not particularly limited and can be appropriately selected depending on the purpose, and may contain, for example, an antifogging agent, an antistatic agent, a heat stabilizer, a nucleating agent, an antioxidant, a lubricant, an antiblocking agent, a release agent, an ultraviolet absorber, a colorant, an extrusion modifier, etc., within a range that does not impair the purpose of the present invention.

[0057] (First layer) The first layer is a layer provided directly on the surface of the base layer. The first layer may be provided directly on one surface of the base layer or on both surfaces of the base layer.

[0058] The first layer is formed by applying a resin composition (1) containing a binder resin and a solvent, the resin composition (1) having an aromatic hydrocarbon solvent content of 50 mass % or less. The first layer may be a functional layer having a predetermined function, such as a printed layer, a removable primer layer, an adhesive layer, or a functional coating layer.

[0059] The average thickness of the first layer is not particularly limited and can be appropriately selected depending on the purpose, but is preferably selected from the range of 0.05 μm to 30 μm, and more preferably 0.1 μm or more and 10 μm or less.

[0060] The resin composition (1) contains a binder resin and a solvent. The resin composition (1) in the laminate film of this embodiment has an aromatic hydrocarbon solvent content of 50% by mass or less. Although the resin composition (1) in the laminate film of this embodiment contains a solvent, the aromatic hydrocarbon solvent content is 50% by mass or less, which suppresses dissolution on the surface of the laminate film. Furthermore, the resin composition (1) in the laminate film of this embodiment has an aromatic hydrocarbon solvent content of 50% by mass or less, which results in the laminate film having excellent blocking resistance. From the same viewpoint, the content of aromatic hydrocarbon solvent in the resin composition (1) in the laminate film of the present embodiment is preferably 40% by mass or less, 30% by mass or less, or 25% by mass or less. Furthermore, when the content of aromatic hydrocarbon solvent in the resin composition (1) in the laminate film of this embodiment is 20% by mass or less, curling of the laminate film can be more effectively suppressed. From the viewpoint of whether or not the laminate film curls, the content of aromatic hydrocarbon solvent in the resin composition (1) in the laminate film of this embodiment is more preferably 20% by mass or less, and it is particularly preferable that the resin composition (1) in the laminate film of this embodiment is substantially free of aromatic hydrocarbon solvent.

[0061] The binder resin in the resin composition (1) is not particularly limited and can be appropriately selected depending on the function to be imparted to the first layer. Examples include cellulose-based resins such as cellulose-based resins such as nitrocellulose, cellulose acetate propionate (CAP), and cellulose acetate butyronate (CAB); polyamide-based resins; (meth)acrylate resins; polystyrene-based resins; urethane-based resins such as polyurethane resins; acrylic resins; copolymer resins of vinyl chloride and other unsaturated double bond-containing monomers such as vinyl chloride-vinyl acetate copolymer resins; chlorinated polypropylene resins; ethylene-vinyl acetate copolymer resins; vinyl acetate resins; vinyl chloride-based resins such as polyvinyl chloride resins; polyester resins; alkyd resins; rosin-based resins; rosin-modified maleic acid resins; ketone resins; cyclized rubber; chlorinated rubber; butyral; petroleum resins; palm oil-derived fats, etc. These may be used alone or in combination of two or more.

[0062] The binder resin in the resin composition (1) may be a plant-derived resin. Examples of plant-derived resins include cellulose-based resins such as cellulose acetate propionate resin and nitrocellulose; polyamide resins using dimer acids or polymerized fatty acids derived from natural oils such as soybean oil, palm oil, and rice bran oil; biomass polyurethanes synthesized from plant-derived raw materials such as polycarboxylic acids (e.g., succinic acid, succinic anhydride, adipic acid, azelaic acid, sebacic acid, dimer acid, glutaric acid, and malic acid); polyols (e.g., ethylene glycol, 1,2-propanediol, 1,3-propanediol, 1,4-butanediol, neopentyl glycol, pentylene glycol, 1,10-dodecanediol, dimer diol, and isosorbide); and polyisocyanates (e.g., 1,5-pentamethylene diisocyanate and dimer diisocyanate); and rosin resins.

[0063] The content of the binder resin in the resin composition (1) is not particularly limited and can be appropriately selected depending on the function to be imparted to the first layer. For example, when the first layer is a printing layer, the content of the binder resin is preferably 1% by mass or more and 25% by mass or less, based on the total amount of the resin composition (1). Furthermore, the content of the binder resin in the resin composition (1) is more preferably 2% by mass or more and more preferably 15% by mass or less, based on the total amount of the resin composition (1).

[0064] The solvent in the resin composition (1) is not particularly limited and can be appropriately selected depending on the purpose. Examples of the solvent include alcohol solvents such as methyl alcohol, ethyl alcohol, normal propyl alcohol, isopropyl alcohol, and butyl alcohol; ketone solvents such as acetone, methyl ethyl ketone, and cyclohexanone; ethylene glycol (mono, di)methyl ether, ethylene glycol (mono, di)ethyl ether, ethylene glycol monopropyl ether, ethylene glycol monoisopropyl ether, monobutyl ether, diethylene glycol (mono, di)methyl ether, diethylene glycol (mono, di)ethyl ether, and diethylene glycol monoisopropyl ether. Examples of suitable solvents include glycol ether solvents such as diethyl ether, diethylene glycol monobutyl ether, triethylene glycol (mono-, di-)methyl ether, propylene glycol (mono-, di-)methyl ether, propylene glycol monopropyl ether, propylene glycol monobutyl ether, and dipropylene glycol (mono-, di-)methyl ether; aliphatic hydrocarbon solvents such as hexane, heptane, octane, and decane; ester solvents such as methyl acetate, ethyl acetate, normal propyl acetate, isopropyl acetate, butyl acetate, amyl acetate, ethyl formate, and butyl propionate; and aromatic hydrocarbon solvents such as toluene, xylene, Solvesso #100, and Solvesso #150. These may be used alone or in combination of two or more.

[0065] The solvent in the resin composition (1) may include a solvent selected from alcohol-based solvents and ester-based solvents, and may include alcohol-based solvents and ester-based solvents.

[0066] The content of the solvent in the resin composition (1) is not particularly limited and can be selected appropriately depending on the purpose. For example, when the first layer is a printing layer, the content is preferably 30% by mass or more and 80% by mass or less, more preferably 40% by mass or more, and more preferably 70% by mass or less, based on the total amount of the resin composition (1).

[0067] The resin composition (1) may contain an optional component (a). The optional component (a) is not particularly limited and can be appropriately selected depending on the function to be imparted to the first layer, and examples thereof include colorants, crosslinking agents, leveling agents, adhesives, antifoaming agents, plasticizers, infrared absorbers, ultraviolet absorbers, fragrances, flame retardants, organic beads, inorganic fillers, silicone additives, waxes, and coating agents.

[0068] The printed layer as the first layer is a layer on which a desired pattern is formed using a resin composition (1) (ink) in order to impart aesthetic appeal, various information related to the contents, and functionality to the laminated film of this embodiment.

[0069] When the first layer is a printing layer, the resin composition (1) (ink) is preferably a liquid printing ink used as a gravure printing ink or a flexographic printing ink. The liquid printing ink is roughly divided into organic solvent-based liquid printing inks, which use an organic solvent as the main solvent, and water-based liquid printing inks, which use water as the main solvent, but either may be used in the present invention.

[0070] When the first layer is a print layer, the resin composition (1) may contain a colorant. Examples of the colorant include inorganic pigments, organic pigments, and dyes that are commonly used in inks, paints, and recording agents. Among these, inorganic pigments and organic pigments are preferred as colorants.

[0071] Examples of inorganic pigments include white inorganic pigments such as titanium oxide, zinc oxide, zinc sulfide, barium sulfate, calcium carbonate, chromium oxide, silica, lithopone, antimony white, and gypsum. Among inorganic pigments, titanium oxide is particularly preferred. Titanium oxide exhibits a white color and is preferred in terms of coloring power, hiding power, chemical resistance, and weather resistance. From the viewpoint of printing performance, titanium oxide that has been treated with silica and / or alumina is preferred. Examples of inorganic pigments other than white include aluminum particles, mica, bronze powder, chrome vermilion, yellow lead, cadmium yellow, cadmium red, ultramarine, Prussian blue, red iron oxide, yellow iron oxide, iron black, and zircon. Aluminum is in powder or paste form, but it is preferably used in paste form from the standpoints of handleability and safety, and whether leafing or non-leafing aluminum is used is selected appropriately from the standpoints of brightness and concentration.

[0072] Examples of organic pigments include soluble azo pigments, insoluble azo pigments, azo pigments, phthalocyanine pigments, halogenated phthalocyanine pigments, anthraquinone pigments, anthanthrone pigments, dianthraquinonyl pigments, anthrapyrimidine pigments, perylene pigments, perinone pigments, quinacridone pigments, thioindigo pigments, dioxazine pigments, isoindolinone pigments, quinophthalone pigments, azomethine azo pigments, flavanthrone pigments, diketopyrrolopyrrole pigments, isoindoline pigments, indanthrone pigments, and carbon black pigments. Other examples include carmine 6B, lake red C, permanent red 2B, disazo yellow, pyrazolone orange, carmine FB, cromophtal yellow, cromophtal red, phthalocyanine blue, phthalocyanine green, dioxazine violet, quinacridone magenta, quinacridone red, indanthrone blue, pyrimidine yellow, thioindigo bordeaux, thioindigo magenta, perylene red, perinone orange, isoindolinone yellow, aniline black, diketopyrrolopyrrole red, daylight fluorescent pigments, etc. In addition, both non-acid-treated pigments and acid-treated pigments can be used.

[0073] These colorants may be used alone or in combination of two or more.

[0074] When the first layer is a printed layer, the content of the colorant is preferably 1% by mass to 60% by mass relative to the resin composition (1), and the solid content weight ratio in the resin composition (1) is preferably 10% by mass to 90% by mass.

[0075] When the first layer is a printing layer, the resin composition (1) may contain a curing agent. As the curing agent, a general-purpose curing agent for organic solvent-based gravure printing inks may be used, but an isocyanate-based curing agent is preferred.

[0076] The content of the curing agent is preferably 0.3 to 10.0% by mass, more preferably 1.0 to 7.0% by mass, based on the solid content in the resin composition (1) from the viewpoint of curing efficiency.

[0077] The removable primer layer as the first layer is a layer that can be easily removed from other layers by treatment with an alkali-containing solution (removal liquid). By having the removable primer layer as the first layer in the laminate film of this embodiment, when the laminate film of this embodiment is recycled to produce recycled plastic, the recyclability is improved and the quality of the recycled plastic can be improved.

[0078] When the first layer is a removable primer layer, the resin composition (1) may contain a resin capable of forming a film at room temperature. Examples of resins capable of forming a film at room temperature include polyesters; polyvinyl chloride; copolymers of vinyl chloride and other unsaturated double bond-containing monomers; homopolymers of (meth)acrylic acid esters; copolymers of (meth)acrylic acid esters and other unsaturated double bond-containing monomers; polystyrene; copolymers of styrene monomers and other unsaturated double bond-containing monomers; ketone-formaldehyde condensates or hydrogenated products thereof; polyfunctional epoxy resins; polyvinyl acetals; urethane resins; and the like. Examples of polyfunctional epoxy resins include bisphenol A novolac epoxy resins, bisphenol F novolac epoxy resins, bisphenol S novolac epoxy resins, biphenyl epoxy resins, and naphthalene epoxy resins. These resins capable of forming a film at room temperature may be used alone or in combination of two or more.

[0079] When the first layer is a removable primer layer, the resin composition (1) preferably contains a urethane resin. The urethane resin is a general term for a polymer compound having a urethane bond (-NHCOO-). The urethane resin can be obtained, for example, by reacting an aromatic polyester polyol with a polyisocyanate and, if necessary, a chain extender.

[0080] When the first layer is a removable primer layer, the resin composition (1) preferably contains polyvinyl alcohol. Polyvinyl alcohol is a colorless powder obtained by saponifying polyvinyl acetate. Polyvinyl alcohol is also a water-soluble thermoplastic resin and is a raw material for the synthetic fiber vinylon.

[0081] The adhesive layer as the first layer is, for example, a layer capable of bonding the substrate layer to any member. When the first layer is an adhesive layer, the resin composition (1) may contain an adhesive that can be used in a general-purpose lamination method. Examples of adhesives include vinyl resins, (meth)acrylic resins, polyamide resins, polyester resins, polyether resins, polyurethane resins, epoxy resins, and rubber resins. Such adhesives may be one-component or two-component, and may be curable or non-curable.

[0082] The functional coating layer as the first layer can be provided on the laminate film for purposes such as hard coating, silicone-based release, IR cut, waterproof and moisture-proof, antibacterial, UV cut, heat dissipation, photocatalysis, weather resistance, anti-fogging, fingerprint and stain resistance, self-repair, and water and oil repellency. Specific examples of the functional coating layer include a hard coating layer, adhesive layer, release layer, decorative layer, light-shielding layer, UV-shielding layer, antistatic layer, refractive index adjustment layer, and oligomer sealing layer. These functional coating layers may be colorless or colored.

[0083] When the first layer is a functional coating layer, the resin composition (1) may contain, depending on the purpose, various coating agents such as surface modifiers such as hard coating agents, self-repairing coating agents, fingerprint-resistant and stain-resistant coating agents, anti-fogging coating agents, silicone-based release agents, non-silicone-based release agents, waterproof and moisture-proof coating agents, water- and oil-repellent coating agents, photocatalytic coating agents, weather-resistant coating agents, and IR-cut coating agents, as well as various coating agents for electronic materials such as optical pressure-sensitive adhesives, polyimide varnishes, liquid crystal alignment film materials, electromagnetic wave shielding coating agents, fine wiring pastes, antistatic coating agents, high refractive index coating agents, and coating agents for optical lenses.

[0084] (heat seal layer) The film of this embodiment preferably includes a heat seal layer.

[0085] The heat seal layer contains a resin having heat sealability. The resin having heat-sealing properties is not particularly limited, and known resins can be selected depending on the purpose, and examples thereof include thermoplastic resins such as α-olefin resins, styrene resins, ester resins, acrylic resins, cyclic olefin resins, rosin-modified maleic acid resins, rosin-modified phenolic resins, nitrocellulose, cellulose acetate, cellulose acetyl propionate, cellulose acetyl butyrate, chlorinated rubber, cyclized rubber, vinyl chloride, vinylidene chloride, polyamide resins, vinyl chloride-vinyl acetate copolymers, polyester resins, ketone resins, butyral resins, chlorinated polypropylene resins, chlorinated polyethylene resins, chlorinated ethylene vinyl acetate resins, ethylene vinyl acetate resins, urethane resins, ethylene-vinyl alcohol resins, styrene-maleic acid resins, casein, and alkyd resins. These may be used alone or in combination of two or more.

[0086] The resin having heat sealing properties is preferably an α-olefin resin, since it can impart good heat sealing properties. Examples of α-olefin resins include homopolymers of α-olefin monomers such as polyethylene homopolymers and polypropylene homopolymers, and copolymers containing α-olefin monomers as the main component such as propylene-ethylene block copolymers, propylene-ethylene random copolymers, ethylene-butene-1 copolymers, and propylene-butene-1 copolymers. These may be used alone or in combination of two or more.

[0087] The thickness ratio of the heat seal layer is not particularly limited and can be selected appropriately depending on the purpose, but it is preferably, for example, 20% or more, 30% or more, and preferably, for example, 60% or less of the total thickness of the base layer and the heat seal layer.

[0088] The average thickness of the heat seal layer is not particularly limited and can be appropriately selected depending on the purpose, but is preferably, for example, 4 μm or more, or 6 μm or more, and is preferably, for example, 28 μm or less, or 25 μm or less.

[0089] The heat seal layer may be provided on the entire surface of the laminated film, or may be provided only on the portion that will be heat sealed when the package is produced.

[0090] The heat seal layer may further contain other components as necessary. The other components are not particularly limited and can be appropriately selected depending on the purpose, and examples thereof include lubricants such as wax and fillers (inorganic fillers, organic fillers), antifoaming agents, plasticizers, leveling agents, emulsifiers, dispersion stabilizers, surfactants, tackifiers, preservatives, antibacterial agents, rust inhibitors, antioxidants, crosslinking agents, curing agents, curing catalysts, light stabilizers, ultraviolet absorbers, photocatalytic compounds, dyes, inorganic pigments, organic pigments, extender pigments, and antistatic agents.

[0091] The heat seal layer can have improved blocking resistance by containing a filler such as an inorganic filler and / or an organic filler, and can also be prevented from flowing out of the heat seal layer and becoming thin when the laminate of the present invention is stored at high temperatures, for example. The inorganic filler is not particularly limited and can be appropriately selected depending on the purpose, and examples thereof include the same ones as those exemplified for the base layer. The organic filler is not particularly limited and can be appropriately selected depending on the purpose. Examples thereof include urethane beads, acrylic beads, and melamine beads. These may be used alone or in combination of two or more. Among these, it is preferable to use either or both of silica and acrylic beads as the filler.

[0092] The shapes of the inorganic and organic fillers are not particularly limited and can be selected appropriately depending on the purpose, but spherical shapes are preferred because they are less susceptible to deformation due to heat and can provide stable anti-blocking effects regardless of the dispersion method in the coating film.The average particle diameters of the inorganic and organic fillers are not particularly limited and can be selected appropriately depending on the purpose, but an example is 0.5 μm to 10 μm.

[0093] The heat seal layer can improve blocking resistance by containing wax. The wax is not particularly limited and can be appropriately selected depending on the purpose, and examples thereof include polyolefin waxes such as fatty acid amide wax, carnauba wax, polyethylene wax, and polypropylene wax; paraffin wax; Fischer-Tropsch wax; beeswax; microcrystalline wax; oxidized polyethylene wax; amide wax; coconut oil fatty acid; soybean oil fatty acid; etc. These may be used alone or in combination of two or more. Among these, it is preferable to use polyethylene wax as the wax, since it can improve blocking resistance without reducing heat sealability.

[0094] The wax content is not particularly limited and can be appropriately selected depending on the purpose. From the viewpoint of the balance between heat sealability and blocking resistance, the wax content in the heat seal layer is preferably 0.1% by mass or more, or 3% by mass or more, and is preferably 20% by mass or less, or 15% by mass or less, based on the total mass of the resin having heat sealability.

[0095] The heat seal layer can be formed by co-extrusion of a resin composition containing a resin having heat sealability and a substrate layer, or by coating a resin composition containing a resin having heat sealability onto a substrate layer.

[0096] The method for applying the resin composition containing a resin having heat sealability to the substrate layer is not particularly limited and can be appropriately selected depending on the purpose, and examples thereof include gravure coating, reverse coating, kiss coating, air knife coating, Mayer bar coating, roll coating, and dip coating. A resin composition containing a resin having heat-sealing properties is applied to a substrate layer, and then dried to form a heat-seal layer. The drying temperature is 50°C to 180°C, and the drying time is about 0.5 seconds to 1 minute. The drying method is not particularly limited, but hot air drying is an example. If necessary, a corona discharge treatment or other post-treatment may be performed.

[0097] Specific embodiments of the laminate film of the present embodiment including a heat seal layer are not particularly limited, but examples thereof include the following laminate films. A laminated film in which the first layer, the base layer, and the heat seal layer are laminated in this order. A laminated film in which the second layer, the first layer, the base layer, and the heat seal layer are laminated in this order. A laminated film in which another layer, a second layer, a first layer, a base layer, and a heat seal layer are laminated in this order. A laminated film in which the first layer, the base layer, the first layer, and the heat seal layer are laminated in this order. A laminated film in which the second layer, the first layer, the base layer, the first layer, and the heat seal layer are laminated in this order. A laminated film in which another layer, a second layer, a first layer, a base layer, a first layer, and a heat seal layer are laminated in this order.

[0098] In the laminated film of the present embodiment, it is preferable that the first layer is provided directly on one surface of the base material layer, and the heat seal layer is provided directly on the other surface of the base material layer.

[0099] In the laminate film of the embodiment, when the first layer is provided directly on one side of the base layer and the heat seal layer is provided directly on the other side of the base layer, the ratio of the thickness of the base layer to the total thickness of the base layer and the heat seal layer is preferably 40% or more. In the laminate film of the preferred embodiment, the ratio of the thickness of the base layer to the total thickness of the base layer and the heat seal layer is 40% or more, so that the laminate film has excellent breakability and can be suitably used as a lid material for PTP packaging. From the same viewpoint, the ratio of the thickness of the base layer to the total thickness of the base layer and the heat seal layer is more preferably 45% or more, or 47% or more.

[0100] The ratio of the thickness of the base layer to the total thickness of the base layer and the heat seal layer is preferably 95% or less, and more preferably 90% or less.

[0101] (Second layer) The laminated film of the present embodiment may further include a second layer on the first layer. The second layer may be a layer having a predetermined function, such as an OP varnish layer, a barrier coat layer, or a printed layer.

[0102] The average thickness of the second layer is not particularly limited and can be appropriately selected depending on the purpose, but is preferably selected from the range of 0.05 μm to 30 μm, for example. The average thickness of the second layer is more preferably 0.1 μm or more and 10 μm or less.

[0103] The method for providing the second layer is not particularly limited, and known methods can be used. The second layer is preferably a layer formed by coating a resin composition (2) containing a binder resin and a solvent, and more preferably a layer formed by coating a resin composition (2) containing a binder resin and a solvent, the content of which is 50 mass% or less of an aromatic hydrocarbon solvent. When the second layer is a layer formed by coating a resin composition (2) containing a binder resin and a solvent, the content of which is 50 mass% or less of an aromatic hydrocarbon solvent, dissolution of the laminate film surface can be more effectively suppressed.

[0104] The phrase "formed by applying a resin composition (2) containing a binder resin and a solvent, wherein the content of an aromatic hydrocarbon solvent is 50 mass % or less" is used in this specification for the purpose of identifying the laminate film, since it is practically not possible to directly identify the target laminate film by its structure.

[0105] The “binder resin,” “solvent,” “aromatic hydrocarbon solvent,” “binder resin content,” and “solvent content” in the resin composition (2) may be the same as those exemplified in the resin composition (1). The resin composition (2) may also contain an optional component (b). The optional component (b) is not particularly limited and can be appropriately selected depending on the function to be imparted to the second layer, and examples thereof include the same components as the optional component (a).

[0106] From the viewpoint of suppressing dissolution on the surface of the laminated film or improving the blocking resistance of the laminated film, the resin composition (2) preferably has an aromatic hydrocarbon solvent content of 50 mass % or less, 40 mass % or less, 30 mass % or less, or 25 mass % or less, and it is particularly preferable that the resin composition (2) is substantially free of aromatic hydrocarbon solvents.

[0107] The second layer, an OP varnish layer, is a coating for protecting the surface of the lid material from scratches and / or heat. When the second layer is an OP varnish layer, the resin composition (2) preferably contains a resin having a polymer skeleton such as a cellulose skeleton, a benzene ring skeleton, an isocyanuric ring skeleton, or an alicyclic skeleton, with the glass transition temperature of the polymer being 100°C or higher.

[0108] When the second layer is an OP varnish layer, the resin composition (2) preferably contains an inorganic filler from the viewpoint of imparting heat resistance to the OP varnish layer. The inorganic filler is not particularly limited, but examples thereof include the same fillers as those exemplified for the base layer.

[0109] The primary particle size of the inorganic filler is preferably 5 nm to 200 nm, more preferably 10 nm to 100 nm. If the primary particle size is 5 nm or more, the inorganic filler in the dispersion is well dispersed, and if it is 200 nm or less, the strength of the OP varnish layer is good.

[0110] In order to provide the OP varnish layer with the properties of preventing scratches on the coated film, preventing blocking during laminate formation, and providing processability during bag making after the laminate is created, it is preferable that the resin composition (2) further contains at least one of wax, silicone additives, and organic beads. Examples of waxes include amide wax, polypropylene wax, polyethylene wax, paraffin wax, carnauba wax, and rice wax. Examples of silicon additives include ethylene oxide (EO) adducts of dimethylsiloxane and modified silicon. Examples of organic beads include organic beads made of acrylic, nylon, urethane, or epoxy.

[0111] The barrier coat layer as the second layer is a layer that has a barrier property against water vapor and / or oxygen. When the second layer is a barrier coat layer, the resin composition (2) may contain a resin having barrier properties against water vapor and / or oxygen. Examples of resins having barrier properties include polyvinyl alcohol (PVOH), ethylene vinyl alcohol (EVOH), polysaccharides, acrylic acid- or methacrylic acid-based polymers, starch or starch derivatives, cellulose nanofibers (CNF), nanocrystalline cellulose (NCC), chitosan, or other cellulose derivatives, hemicellulose, polyvinylidene chloride (PVDC), etc.

[0112] When the second layer is a barrier coat layer, the resin composition (2) may contain an inorganic substance. Examples of the inorganic substance include silica, alumina, aluminum flakes, glass flakes, hydrous silicates (phyllosilicate minerals, etc.), kaolinite-serpentine group clay minerals (halloysite, kaolinite, endelite, dickite, nacrite, etc., antigorite, chrysotile, etc.), pyrophyllite-talc group (pyrophyllite, talc, kerolite, etc.), smectite group clay minerals (montmorillonite, beidellite, nontronite, saponite, etc.), and the like. nite, hectorite, sauconite, stevensite, etc.), vermiculite group clay minerals (vermiculite, etc.), mica or mica group clay minerals (muscovite, phlogopite, etc. mica, margarite, tetrasilylic mica, taeniolite, etc.), chlorite group (cookite, sudoite, clinochlore, chamosite, nimite, etc.), hydrotalcite, plate-like inorganic compounds such as plate-like barium sulfate, boehmite, and aluminum polyphosphate.

[0113] The second layer, the printed layer, is a layer on which a desired pattern is formed using ink (e.g., resin composition (2)) in order to impart aesthetic appeal, various information related to the contents, and functionality to the laminated film of this embodiment. The specific embodiment of the printed layer as the second layer is not particularly limited, but examples thereof include the same ones as those exemplified for the first layer.

[0114] (Other layers) The laminated film of this embodiment may further include other layers on the second layer. The other layers may be layers having a specific function, such as a barrier coat layer or an OP varnish layer. Specific embodiments of the barrier coat layer and the OP varnish layer in the other layers are not particularly limited, but may include, for example, the same layers as those exemplified for the second layer.

[0115] The other layer may be a single layer or multiple layers.

[0116] The average thickness of the other layers is not particularly limited and can be appropriately selected depending on the purpose, but is preferably selected from the range of 0.05 μm to 30 μm, for example. The average thickness of the other layers is more preferably 0.1 μm or more and 10 μm or less, for example.

[0117] From the viewpoint of improving the blocking resistance of the laminated film, the other layer is preferably a layer formed by coating a resin composition (3) containing a binder resin and a solvent, the resin composition (3) having an aromatic hydrocarbon solvent content of 50 mass% or less. From the same viewpoint, the resin composition (3) preferably has an aromatic hydrocarbon solvent content of 40 mass % or less, 30 mass % or less, or 25 mass % or less, and it is particularly preferable that the resin composition (3) is substantially free of aromatic hydrocarbon solvents.

[0118] The "binder resin," "solvent," "aromatic hydrocarbon solvent," "binder resin content," and "solvent content" in the other layers may be the same as those exemplified for the first layer.

[0119] The resin composition (3) may contain an optional component (c). The optional component (c) is not particularly limited and can be appropriately selected depending on the function to be imparted to the other layers, and examples thereof include the same components as the optional component (a).

[0120] The phrase "formed by applying a resin composition (3) containing a binder resin and a solvent, wherein the content of an aromatic hydrocarbon solvent is 50 mass % or less" is used in this specification for the purpose of identifying the laminate film, since it is practically not possible to directly identify the target laminate film by its structure.

[0121] <Laminated film manufacturing method> The method for producing the laminated film of the present embodiment (hereinafter, sometimes referred to as the "production method of the present embodiment") is not particularly limited, but may be, for example, a coating step of coating a resin composition (1) containing a binder resin and a solvent, the resin composition (1) having an aromatic hydrocarbon solvent content of 50% by mass or less, directly onto the surface of a substrate layer to obtain a coated product; and a drying step of volatilizing the solvent in the coated material to dry the coated material.

[0122] The "cyclic olefin," "binder resin," "solvent," and "aromatic hydrocarbon solvent" in the production method of this embodiment may be the same as those exemplified for the laminated film of this embodiment.

[0123] The method for applying the resin composition (1) to the surface of the substrate layer is not particularly limited and can be appropriately selected depending on the purpose. Examples of the method include gravure coating, reverse coating, kiss coating, air knife coating, Mayer bar coating, roll coating, and dip coating.

[0124] The method for drying the coated product is not particularly limited, but may be, for example, hot air drying. As for the drying conditions, the drying temperature may be, for example, 50°C to 180°C, and the drying time may be, for example, 0.5 seconds to 1 minute.

[0125] <Applications of laminated film> The laminate film of this embodiment is not particularly limited in its use, but is particularly useful as a lid material for a package. As described above, the laminate film of this embodiment has a good appearance because dissolution of the laminate film surface is suppressed. Furthermore, a package using the laminate film of this embodiment as a lid material has excellent sealability.

[0126] <Package> A package according to one embodiment of the present invention (hereinafter sometimes referred to as "the package according to this embodiment") comprises a lid and a container having a recess, and the lid is a laminated film according to one embodiment of the present invention. The lid can be thermally bonded (heat sealed) to the opening of the container, and by heat sealing the lid and the container, an item can be placed in the recess and sealed.

[0127] The package of this embodiment uses a laminated film as the lid material, which is less susceptible to surface dissolution, and therefore has a good appearance and excellent sealing properties.

[0128] The resin constituting the container having a recess is not particularly limited, and any known heat-sealable olefin resin can be appropriately selected depending on the purpose.

[0129] There are no particular limitations on the method for manufacturing a container having a recess, and any known method can be selected as appropriate depending on the purpose. For example, there is a method in which a container having a recess capable of containing an object is molded from a sheet-like film using a mold having a specific shape (for example, a shape corresponding to the object to be contained).

[0130] The packaging body of this embodiment can be manufactured by a known method, for example, by placing the contents in a container having a recess, covering it with a lid, degassing or replacing the air with an inert gas or the like, and heat-sealing the contacting portions of the lid and the container.

[0131] There are no particular limitations on the heat sealing, and it can be carried out using a known heat sealing packaging machine as appropriate depending on the purpose. There are no particular limitations on the molding heating temperature in the heat sealing, and it can be selected appropriately depending on the purpose, and it can be, for example, 80°C to 180°C. Furthermore, the molding time in the heat sealing can be, for example, 0.1 seconds to 5.0 seconds. [Example]

[0132] The present invention will be described in more detail below with reference to examples, but the present invention is not limited to the following examples in any way.

[0133] In the examples, the following cyclic olefin resins, non-toluene inks, and non-toluene OP varnishes were used. Cyclic olefin resin (1)... Ring-opening polymer of norbornene monomer (MVR: 4cm 3 / 10 minutes (260℃, 2.16kg), density: 1.02g / cm 3 , glass transition temperature: 158℃) Cyclic olefin resin (2)...Ring-opening polymer of norbornene monomer (MVR: 12cm 3 / 10 minutes (230℃, 2.16kg), density: 1.02g / cm 3 , glass transition temperature: 78°C) Non-toluene white ink: Finart R794 White S, manufactured by DIC Graphics Corporation (Contains polyurethane resin and vinyl chloride-vinyl acetate copolymer resin as binder resins, and ethyl acetate, normal propyl acetate, and isopropyl alcohol as solvents.) Non-toluene crimson ink: Finart F115 crimson, manufactured by DIC Graphics Corporation (Contains polyurethane resin and vinyl chloride-vinyl acetate copolymer resin as binder resins, and ethyl acetate, normal propyl acetate, isopropyl alcohol, and normal propyl alcohol as solvents.) Non-toluene OP varnish XS-907 Medium manufactured by DIC Graphics Corporation (Contains vinyl chloride-vinyl acetate copolymer resin and alkyd resin as binder resins, and ethyl acetate, normal propyl acetate, and methyl ethyl ketone as solvents.)

[0134] <Preparation of a film having a substrate layer and a heat seal layer> 50 parts by mass of cyclic olefin resin (1), 30 parts by mass of cyclic olefin resin (2), and 20 parts by mass of a masterbatch containing 40% by mass of talc as an inorganic filler were mixed to prepare a resin composition for the first substrate layer. 50 parts by mass of the cyclic olefin resin (1) and 50 parts by mass of the cyclic olefin resin (2) were mixed to prepare a resin composition for the second substrate layer. MFR: 6 g / 10 min (230 °C, 21.18 N), density: 0.89 g / cm 3 The polypropylene was used as the resin for the heat seal layer (resin having heat sealability). Using a coextrusion method, the resin for the heat seal layer, the resin composition for the first substrate layer, and the resin composition for the second substrate layer were extruded from a T-die at an extrusion temperature of 250°C so that the heat seal layer, the first substrate layer, and the second substrate layer were laminated in that order, with the thickness ratios of each layer being 50%, 30%, and 20%, respectively, and then cooled on a water-cooled metal cooling roll at 50°C. After cooling, the film was subjected to a corona discharge treatment so that the wet tension of the second substrate layer was 40 mN / m, then wound onto a roll and aged in an aging chamber at 40°C for 24 hours to produce a film (hereinafter sometimes referred to as "coextruded film 1") having a substrate layer (consisting only of a first substrate layer containing a cyclic olefin resin and an inorganic filler, and a second substrate layer containing the cyclic olefin resin but no inorganic filler) and a heat seal layer. The total thickness of coextruded film 1 was 30 μm, and the talc content relative to the total mass of coextruded film 1 was 2.4 mass%.

[0135] <Examples 1 to 7, Comparative Example 1: Preparation and Evaluation of Laminated Films> Resin composition (1) was prepared by diluting the non-toluene white ink with toluene as necessary to obtain the aromatic hydrocarbon solvent content shown in Table 1. Resin composition (1) was directly applied onto the substrate layer of co-extruded film 1 using a bar coater #7 and dried with a dryer to form a first layer on the surface of the substrate layer. In this way, a laminated film was produced.

[0136] (evaluation) The surface condition of the resulting laminated film and the presence or absence of curling were observed and evaluated according to the following criteria. The results are shown in Table 1.

[0137] -Surface condition- A: No dissolution was observed on the surface of the laminated film (no change on the surface of the laminated film). B: Slight dissolution is observed on the surface of the laminated film. C: Significant dissolution is observed on the surface of the laminated film.

[0138] -Whether or not there is curl- A: The laminated film does not curl after drying. B: After drying, curling occurred in part of the laminated film. C: After drying, the laminated film curled entirely.

[0139] [Table 1]

[0140] Table 1 shows that Example 7, in which the content of aromatic hydrocarbon solvent in resin composition (1) is 50% by mass, has a better evaluation result for the surface condition than Comparative Example 1, in which the content of aromatic hydrocarbon solvent in resin composition (1) is 60% by mass, i.e., dissolution of the laminate film surface is suppressed. Furthermore, it can be seen that Example 1-6, in which the content of aromatic hydrocarbon solvent in resin composition (1) is 40% by mass or less, further suppresses dissolution of the laminate film surface.

[0141] Furthermore, Example 1-3, in which the content of aromatic hydrocarbon solvent in the resin composition (1) was 20% by mass or less, showed excellent results in the evaluation of the presence or absence of curl, indicating that curling of the laminated film was suppressed.

[0142] <Examples 8-10, Comparative Examples 2 and 3: Preparation and Evaluation of Laminated Films> The toluene-free white ink was diluted with toluene so that the content of the aromatic hydrocarbon solvent became 60 mass % to prepare a toluene-containing white ink. The non-toluene crimson ink was diluted with toluene so that the content of aromatic hydrocarbon solvent was 60 mass % to prepare a toluene-containing crimson ink. The toluene-free OP varnish was diluted with toluene so that the content of the aromatic hydrocarbon solvent became 60 mass % to prepare a toluene-containing OP varnish. The various compositions used in Examples 8-10 and Comparative Examples 2 and 3 are as shown in Table 2. In Example 10 and Comparative Example 3, the resin composition (1) shown in Table 2 was directly applied onto the substrate layer of the co-extruded film using a bar coater #7 and then dried using a dryer to form a first layer on the surface of the substrate layer, thereby producing a laminated film. In Examples 8 and 9 and Comparative Example 2, the resin composition (1) shown in Table 2 was applied directly onto the base layer of the co-extruded film 1 using bar coater #7 and dried with a dryer to form a first layer, then the resin composition (2) shown in Table 2 was applied directly onto the first layer using bar coater #7 and dried with a dryer to form a second layer, and then the OP varnish composition shown in Table 2 was applied directly onto the second layer using bar coater #7 and dried with a dryer to form an OP varnish layer, thereby producing a laminated film.

[0143] (evaluation) The surface condition of the obtained laminated film was observed and evaluated according to the following criteria. In addition, tests were conducted according to the following procedures, and blocking resistance was evaluated according to the following criteria. The results are shown in Table 2.

[0144] -Surface condition- A: No dissolution was observed on the surface of the laminated film (no change on the surface of the base layer). B: Slight dissolution is observed on the surface of the laminated film. C: Significant dissolution is observed on the surface of the laminated film.

[0145] -Blocking resistance- The laminated film was then placed on top of each other so that the printed and non-printed surfaces were in contact with each other, and subjected to a pressure of 2 kgf / cm 2 The laminated films were then peeled off and the state of the films was evaluated using the following three-level scale: A, B, C. A Peels off without resistance. B: Resistance is felt when peeling off. No peeling marks are observed. C: There is strong resistance when peeling off, and peeling marks are observed.

[0146] [Table 2]

[0147] From Table 2, it can be seen that Example 10, in which a non-toluene white ink was used as the resin composition (1), had superior evaluation results for the surface condition compared to Comparative Example 3, in which a toluene-containing white ink was used as the resin composition (1), i.e., dissolution of the laminated film surface was suppressed.

[0148] Furthermore, Example 10, which used a non-toluene white ink as the resin composition (1), showed better evaluation results for blocking resistance than Comparative Example 3, which used a toluene-containing white ink as the resin composition (1), and it was found that Example 10 had good blocking resistance.

[0149] Examples 8 and 9, which used non-toluene white ink as resin composition (1) and non-toluene red ink as resin composition (2), had superior evaluation results for the surface condition compared to Comparative Example 2, which used toluene-containing white ink as resin composition (1) and toluene-containing red ink as resin composition (2), indicating that dissolution of the laminated film surface was suppressed.

[0150] Furthermore, Examples 8 and 9, which used non-toluene white ink as resin composition (1) and non-toluene red ink as resin composition (2), showed better evaluation results for blocking resistance than Comparative Example 2, which used toluene-containing white ink as resin composition (1) and toluene-containing red ink as resin composition (2), demonstrating good blocking resistance. Furthermore, Example 8, which used a non-toluene OP varnish as the OP varnish composition, showed even better evaluation results for blocking resistance compared to Example 9, which used a toluene-containing OP varnish as the OP varnish composition, demonstrating particularly good blocking resistance. [Industrial Applicability]

[0151] According to the present invention, it is possible to provide a laminate film having a substrate layer containing a cyclic olefin resin, in which dissolution of the surface of the laminate film is suppressed. Furthermore, according to the present invention, it is possible to provide a package using the above-mentioned laminated film as a lid material.

Claims

1. a substrate layer containing a cyclic olefin resin; and a first layer provided directly on a surface of the substrate layer, The laminated film, characterized in that the first layer is formed by coating a resin composition (1) containing a binder resin and a solvent, the resin composition (1) having an aromatic hydrocarbon solvent content of 50 mass% or less.

2. 2. The laminated film according to claim 1, wherein the first layer is provided directly on one surface of the base material layer, and a heat seal layer is provided directly on the other surface of the base material layer, and the ratio of the thickness of the base material layer to the total thickness of the base material layer and the heat seal layer is 40% or more.

3. The laminated film according to claim 1 or 2, wherein the cyclic olefin resin has a glass transition temperature of 60°C or higher.

4. The laminated film according to claim 1 or 2, wherein the solvent comprises a solvent selected from an ester-based solvent and an alcohol-based solvent.

5. The laminated film according to claim 1 or 2, further comprising a second layer on the first layer.

6. 6. The laminate film according to claim 5, wherein the second layer is formed by coating a resin composition (2) containing a binder resin and a solvent, the resin composition (2) having an aromatic hydrocarbon solvent content of 50 mass% or less.

7. The laminate film according to claim 2 , wherein the substrate layer consists of only a first substrate layer containing the cyclic olefin resin and an inorganic filler, and a second substrate layer containing the cyclic olefin resin but not containing an inorganic filler.

8. The laminated film according to claim 7 , wherein the base material layers are laminated in the order of the first base material layer and the second base material layer from the side that contacts the heat seal layer.

9. 9. The laminate film according to claim 7, wherein the content of the inorganic filler in the first substrate layer is 0.1% by mass or more and 10% by mass or less with respect to the total mass of the substrate layer and the heat seal layer.

10. The laminated film according to claim 1 or 2, which is a lid material for a package.

11. A container having a recess and a lid material, A packaging body, wherein the lid material is the laminated film according to claim 1 or 2.

Images