Laminated films and packaging

Abstract

To provide a laminated film that does not contain benzenes and has good adhesion and solvent release properties, and a packaging body constructed using the laminated film. [Solution] A laminated film comprising an adhesive layer (C), a resin layer (A) provided on one side of the adhesive layer (C), and a resin layer (B) provided on the other side of the adhesive layer (C), wherein the adhesive layer (C) contains an olefin-based adhesive and an ester-based adhesive, the resin layer (A) contains polyvinyl chloride or polyvinylidene chloride, if the resin layer (A) contains polyvinyl chloride, the resin layer (B) contains a resin other than polyvinyl chloride, and if the resin layer (A) contains polyvinylidene chloride, the resin layer (B) contains a resin other than polyvinylidene chloride.

Description

[Technical Field]

[0001] This invention relates to laminated films and packaging materials. [Background technology]

[0002] A press-through package (also referred to herein as "PTP") is a packaging body in which a bottom material with a recess and a sheet-like lid material are heat-sealed, and a storage compartment is formed by the recess and the lid material, and is widely used for packaging tablets.

[0003] Typically, laminated films, composed of multiple layers of resin, are used as the resin film for forming the base material of PTP (Press-Through Packaging). This is because it is difficult to achieve the various properties required for the base material with a single layer of resin film.

[0004] Laminated films are conventionally manufactured by applying an adhesive diluted with a solvent to one side of one resin film, removing the solvent from the formed coating layer and drying it to create an adhesive layer, and then laminating one side of the other resin film to the surface of this adhesive layer. This method of forming an adhesive layer by drying an adhesive diluted with a solvent and then bonding the resin films together using this adhesive layer is called dry lamination and is widely used. Dry lamination is an excellent method because it can efficiently produce laminated films with high adhesive strength.

[0005] Adhesives used in laminated films should not only have good adhesion but also possess the property of being able to quickly separate the resin layers to be bonded together in the laminated film when needed (solvent release properties). For example, urethane-based adhesives diluted with toluene have good adhesion and solvent release properties (see Patent Document 1). [Prior art documents] [Patent Documents]

[0006] [Patent Document 1] Patent No. 6819293 [Overview of the Initiative] [Problems that the invention aims to solve]

[0007] However, using benzenes such as toluene as solvents to dilute adhesives presents a problem: they are harmful to the human body. Furthermore, the release of benzenes into the atmosphere can have adverse effects on the environment.

[0008] The present invention aims to provide a laminated film that does not contain benzenes and has good adhesion and solvent release properties, and a packaging body constructed using the laminated film. [Means for solving the problem]

[0009] To solve the above problems, the present invention adopts the following configuration. [1] A laminated film comprising an adhesive layer (C), a resin layer (A) provided on one side of the adhesive layer (C), and a resin layer (B) provided on the other side of the adhesive layer (C), wherein the adhesive layer (C) contains an olefin-based adhesive and an ester-based adhesive, the resin layer (A) contains polyvinyl chloride or polyvinylidene chloride, and if the resin layer (A) contains polyvinyl chloride, the resin layer (B) contains a resin other than polyvinyl chloride, and if the resin layer (A) contains polyvinylidene chloride, the resin layer (B) contains a resin other than polyvinylidene chloride.

[0010] [2] The laminated film according to [1], wherein the resin layer (A) contains polyvinyl chloride, the resin layer (B) contains polyvinylidene chloride, polyethylene, or polypropylene, and the resin layer (A) contains polyvinylidene chloride, the resin layer (B) contains polyvinyl chloride, polyethylene, or polypropylene.

[0011] [3] When the resin layer (A) contains polyvinyl chloride, the resin layer (B) contains polyvinylidene chloride, low-density polyethylene, linear low-density polyethylene, metallocene-catalyzed linear low-density polyethylene or polypropylene random copolymer. When the resin layer (A) contains polyvinylidene chloride, the resin layer (B) contains polyvinyl chloride, low-density polyethylene, linear low-density polyethylene, metallocene-catalyzed linear low-density polyethylene or polypropylene random copolymer. The laminated film according to [2].

[0012] [4] The laminated film according to any one of [1] to [3], wherein the mass ratio of the olefin-based adhesive to the ester-based adhesive in the adhesive layer (C) is 9:1 to 5:5. [5] The laminated film according to any one of [1] to [4], wherein the olefin-based adhesive is a modified polyolefin. [6] The laminated film according to any one of [1] to [5], wherein the laminated film has a laminated structure of the resin layer (A), the adhesive layer (C), and the resin layer (B) two or more times.

[0013] [7] The laminated film according to any one of [1] to [6], wherein the laminated film is a laminated film for a blister pack. [8] A package constituted by using the laminated film according to any one of [1] to [7]. [9] The package according to [8], wherein the package includes a lid material and a bottom material, the package is constituted by sealing the lid material and the bottom material, and the bottom material is constituted by using the laminated film. [Effect of the Invention]

[0014] According to the present invention, there are provided a laminated film containing no benzenes and having good adhesiveness and solvent peelability, and a package constituted by using the laminated film. [Brief Description of the Drawings]

[0015] [Figure 1] It is a cross-sectional view schematically showing an example of a laminated film according to an embodiment of the present invention. [Figure 2A] It is a cross-sectional view schematically showing another specific example of a laminated film according to an embodiment of the present invention. [Figure 2B] It is a cross-sectional view schematically showing another specific example of a laminated film according to an embodiment of the present invention. [Figure 2C] It is a cross-sectional view schematically showing another specific example of a laminated film according to an embodiment of the present invention. [Figure 2D] It is a cross-sectional view schematically showing another specific example of a laminated film according to an embodiment of the present invention. [Figure 3] It is a perspective view schematically showing an example of a package according to an embodiment of the present invention. [Figure 4] It is a cross-sectional view taken along line IV-IV of the package shown in FIG. 3.

Mode for Carrying Out the Invention

[0016] <<Laminated Film (I)>> The laminated film according to an embodiment of the present invention is a laminated film including an adhesive layer (C), a resin layer (A) provided on one surface of the adhesive layer (C), and a resin layer (B) provided on the other surface of the adhesive layer (C), wherein the adhesive layer (C) contains an olefin-based adhesive and an ester-based adhesive, the resin layer (A) contains polyvinyl chloride or polyvinylidene chloride, when the resin layer (A) contains polyvinyl chloride, the resin layer (B) contains a resin other than polyvinyl chloride, and when the resin layer (A) contains polyvinylidene chloride, the resin layer (B) contains a resin other than polyvinylidene chloride.

[0017] In this specification, the laminated film of the present embodiment may be referred to as "laminated film (I)". The laminated film (I) can have good adhesion and solvent release properties because the adhesive layer (C) contains olefin-based adhesives and ester-based adhesives, does not contain benzenes, and the combination of resins contained in the resin layers (A) and (B) to which the adhesive layer (C) is bonded is a specific combination.

[0018] In this specification, "benzenes" is a comprehensive term encompassing benzene and other components that have a benzene ring skeleton and can act as solvents. Examples of these other components include toluene, ethylbenzene, and xylene.

[0019] The laminated film (I) is suitable as a laminated film for blister packs. It is preferable that the laminated film (I) is transparent throughout.

[0020] The thickness (overall thickness) of the laminated film (I) is not particularly limited, but is preferably 100 μm to 400 μm, and may be, for example, 200 μm to 250 μm or 250 μm to 300 μm. When the thickness of the laminated film (I) is greater than or equal to the lower limit, the strength of the laminated film (I) is increased. When the thickness of the laminated film (I) is less than or equal to the upper limit, the laminated film (I) can be made thinner and molded more easily. Furthermore, when the thickness of the laminated film (I) is within this range, the properties related to the molded product of the laminated film (I), such as the oxygen barrier properties, water vapor barrier properties, moldability, and extrusion properties of the recesses of the base material which is the molded product of the laminated film (I), are improved in a well-balanced manner. Here, "extrusion properties of the recessed area of ​​the base material" refers to the characteristic that, for example, even if unintended pressure is applied to the recessed area during everyday handling, the recessed area will not collapse and the packaged goods will not be ejected, while at the same time, when you want to remove the packaged goods, you can remove them smoothly without having to press the recessed area with excessive pressure.

[0021] Next, we will explain the properties of the laminated film (I) in more detail.

[0022] <Coating adhesion between resin layer (A) and resin layer (B)> The adhesion of the coating between resin layer (A) and resin layer (B) can be evaluated in accordance with JIS K 5600-5-6 (cross-cut method). For example, a test piece measuring 100 mm or more in width and 100 mm or more in length is prepared from a long piece of the laminated film (I). Immediately afterward, the test piece is subjected to humidity control treatment by being left to stand for 30 minutes or more in an environment of 23°C and 50% relative humidity. The test piece is placed on a hard, flat surface with the resin layer (B) side facing upwards. Then, cuts are manually made using a cutting tool specified in the JIS standard, penetrating to the surface of the resin layer (A) side. To form a grid pattern, an equal number of parallel cuts are made in a direction 90° to the cuts, overlapping the cuts (for example, the number of cuts in each direction of the grid pattern is 6). Apply a transparent pressure-sensitive adhesive tape (tape with an adhesive strength of 10±1N per 25mm width) to the surface with the cut, and rub the tape firmly with your fingertips to ensure proper contact with the coating film. Leave the tape in place for 5 minutes, then grasp the end of the tape, and with the angle between the test piece and the tape being 60°, pull the tape away in 1.0 second. After the above operation, the adhesion between resin layer (A) and resin layer (B) can be evaluated based on the surface condition of the cross-cut portion where peeling has occurred.

[0023] The surface condition of the cross-cut portion after the above operation is preferably such that even if the coating peels along the edges of the cuts and / or at the intersections, the affected area of ​​the cross-cut portion is clearly more than 5% but not more than 15%; more preferably, even if there is small peeling of the coating at the intersections of the cuts, the affected area of ​​the cross-cut portion is clearly not more than 5%; and even more preferably, the edges of the cuts are perfectly smooth and there is no peeling at any of the grid lines.

[0024] The adhesion between resin layer (A) and resin layer (B) can be easily adjusted, for example, by adjusting the type and amount of olefin-based adhesive and ester-based adhesive contained in adhesive layer (C), as well as the thickness of adhesive layer (C).

[0025] <Peel strength between resin layer (A) and resin layer (B)> When a test piece with a width of 15 mm is cut from the laminated film (I), the resin layer (A) in the test piece is fixed at room temperature, and the resin layer (B) is pulled from one end towards the other end, so that the angle between the surface of resin layer (A) that was bonded to resin layer (B) via the adhesive layer (C) and the surface of resin layer (B) that was bonded to resin layer (A) via the adhesive layer (C) is 180°, and the resin layer (B) is peeled from resin layer (A) for a distance of 100 mm at a peeling speed of 50 mm / min (so-called 180° peeling), the peel strength between resin layer (A) and resin layer (B) is preferably 3 N / 15 mm or more, more preferably 5 N / 15 mm or more, and even more preferably 7 N / 15 mm or more. The greater the peel strength, the greater the structural stability of the laminated film (I). The upper limit of the peel strength between resin layer (A) and resin layer (B) is not particularly limited. For example, a laminated film (I) having a peel strength of 15 N / 15 mm or less can be more easily realized. In one embodiment, the peel strength may be, for example, 3 to 15 N / 15 mm, 5 to 15 N / 15 mm, or 7 to 15 N / 15 mm. However, these are just examples of the peel strength.

[0026] In the laminated film (I), the direction in which the resin layer (B) is pulled (for example, the longitudinal direction of the test piece) when measuring the peel strength between the resin layer (A) and the resin layer (B) may be the same as either the MD or TD of the laminated film (I), and it is preferable that it be the same as the MD. That is, the peel strength may be either the peel strength measured when the resin layer (B) is pulled in the same direction as the MD of the laminated film (I) in the test piece, or the peel strength measured when the resin layer (B) is pulled in the same direction as the TD of the laminated film (I), and it is preferable that the peel strength measured when the resin layer (B) is pulled in the same direction as the MD of the laminated film (I).

[0027] In this specification, "MD" means the machine direction (also referred to as the resin flow direction). "TD" means the transverse direction, which is perpendicular to the machine direction (MD).

[0028] The peel strength between resin layer (A) and resin layer (B) can be easily adjusted, for example, by adjusting the type and amount of olefin-based adhesive and ester-based adhesive contained in adhesive layer (C), as well as the thickness of adhesive layer (C).

[0029] <Solvent release properties between resin layer (A) and resin layer (B)> When the laminated film (I) is immersed in acetone at room temperature, the time until the resin layer (A) and resin layer (B) separate (solvent peelability) is preferably 20 minutes or less, more preferably 15 minutes or less, and even more preferably 10 minutes or less. The shorter the time, the better the solvent peelability of the laminated film (I). When the laminated film (I) is immersed in acetone at 40°C, the time until the resin layer (A) and resin layer (B) separate (solvent peelability) is preferably 5 minutes or less, more preferably 3 minutes or less, and even more preferably 2 minutes or less. The shorter the time, the better the solvent peelability of the laminated film (I). The solvent release properties between resin layer (A) and resin layer (B) can be easily adjusted, for example, by adjusting the type and amount of olefin-based and ester-based adhesives contained in adhesive layer (C), as well as the thickness of adhesive layer (C).

[0030] Figure 1 is a schematic cross-sectional view showing an example of a laminated film (I). In addition, the diagrams used in the following explanation may be enlarged for convenience in order to make the features of the present invention easier to understand, and the dimensional ratios of each component may not be the same as in reality.

[0031] The laminated film 1 shown here comprises an adhesive layer (C) 12, a resin layer (A) 11 provided on one side of the adhesive layer (C) 12, and a resin layer (B) 13 provided on the other side of the adhesive layer (C) 12. In other words, the laminated film 1 is constructed by laminating the resin layer (A) 11, the adhesive layer (C) 12, and the resin layer (B) 13 in this order in the thickness direction.

[0032] The adhesive layer (C) 12 contains an olefin-based adhesive and an ester-based adhesive. The resin layer (A) 11 contains polyvinyl chloride or polyvinylidene chloride. If the resin layer (A) 11 contains polyvinyl chloride, the resin layer (B) 13 contains a resin other than polyvinyl chloride, and if the resin layer (A) 11 contains polyvinylidene chloride, the resin layer (B) 13 contains a resin other than polyvinylidene chloride.

[0033] One surface (sometimes referred to as the "second surface") 11b of the resin layer (A) 11 may be the same as one surface (sometimes referred to as the "second surface") 1b of the laminated film 1, or it may be the outermost layer (exposed surface). One surface (sometimes referred to as the "first surface") 13a of the resin layer (B) 13 may be the same as the other surface (sometimes referred to as the "first surface") 1a of the laminated film 1, or it may be the outermost layer (exposed surface). Either the first surface 1a or the second surface 1b of the laminated film 1 may be the sealing surface when heat-sealing with another film or molded body thereof, while the other may be the exposed surface of the package obtained by heat-sealing.

[0034] In a laminated film (I), the outermost layer refers to the outermost layer in the stacking direction of each layer constituting the laminated film, and the outermost surface, as described below, refers to the outermost surface (i.e., exposed surface) in the stacking direction of each layer constituting the laminated film.

[0035] Next, we will describe each layer that makes up the laminated film 1 in more detail.

[0036] <Resin layer (A) 11 and resin layer (B) 13> The resin layer (A) 11 may be a single layer or multiple layers, but a single layer is preferred. The resin layer (B) 13 may be a single layer or multiple layers, but a single layer is preferred.

[0037] The thickness of the resin layer (A) 11 is preferably 20 μm or more, and may be, for example, 80 μm or more, 100 μm or more, or 200 μm or more. When the thickness of the resin layer (A) 11 is equal to or greater than the lower limit, the structure of the resin layer (A) 11 is more stable, and the effects obtained by the laminated film (I) having the resin layer (A) 11 are further enhanced. On the other hand, in order to avoid the resin layer (A) 11 being excessively thick, it is preferable that the thickness of the resin layer (A) 11 be 300 μm or less. In one embodiment, the thickness of the resin layer (A) 11 may be, for example, 20 μm to 60 μm, 80 μm to 100 μm, 100 μm to 200 μm, or 200 μm to 300 μm. However, these are just examples of the thickness of the resin layer (A) 11.

[0038] The thickness of the resin layer (B) 13 is preferably 20 μm or more, and may be, for example, 80 μm or more, 100 μm or more, or 200 μm or more. When the thickness of the resin layer (B) 13 is equal to or greater than the lower limit, the structure of the resin layer (B) 13 becomes more stable, and the effects obtained by the laminated film (I) having the resin layer (B) 13 are further enhanced. On the other hand, in order to avoid the resin layer (B) 13 being excessively thick, it is preferable that the thickness of the resin layer (B) 13 be 300 μm or less. In one embodiment, the thickness of the resin layer (B) 13 may be, for example, 20 μm to 60 μm, 80 μm to 100 μm, 100 μm to 200 μm, or 200 μm to 300 μm. However, these are just examples of the thickness of the resin layer (B) 13.

[0039] <When resin layer (A) 11 contains polyvinyl chloride> First, we will explain the case where the resin layer (A) 11 contains polyvinyl chloride.

[0040] The resin layer (A) 11 may or may not contain other components other than polyvinyl chloride, as long as it does not impair the effects of the present invention. The other components contained in the resin layer (A) 11 may consist of only one type or two or more types. If there are two or more types, their combination and ratio can be arbitrarily selected according to the purpose.

[0041] The other components contained in the resin layer (A) 11 may be either resin components or non-resin components.

[0042] Of the other components contained in the resin layer (A) 11, the resin component is not particularly limited as long as it is a resin other than polyvinyl chloride. However, it is preferable that the resin component is other than polyvinylidene chloride.

[0043] Among the other components contained in the resin layer (A) 11, the non-resin components include, for example, various additives known in the field, such as antifogging agents, antiblocking agents, antioxidants, antistatic agents, crystal nucleating agents, inorganic particles, viscosity reducers, viscosity thickeners, heat stabilizers, lubricants, infrared absorbers, and ultraviolet absorbers.

[0044] In the resin layer (A) 11, the ratio of the polyvinyl chloride content to the total mass of the resin layer (A) 11 ([Polyvinyl chloride content in resin layer (A) 11 (parts by mass)] / [Total mass of resin layer (A) 11 (parts by mass)] × 100) is preferably 80% by mass or more, and may be, for example, 85% by mass or more, 90% by mass or more, 95% by mass or more, and 97% by mass or more. On the other hand, the aforementioned ratio is 100% by mass or less. The aforementioned ratio is typically the same as the ratio of the polyvinyl chloride content to the total content (parts by mass) of components that do not vaporize at room temperature in the resin composition described later ([Polyvinyl chloride content in the resin composition (parts by mass)] / [Total content of components that do not vaporize at room temperature in the resin composition (parts by mass)] × 100). The relationship between the content of a component in any of the layers constituting the laminated film and the content of that component in the composition for forming that layer is the same for layers other than the resin layer (A) 11, as will be described later.

[0045] In this specification, "room temperature" means a temperature that is neither cooled nor heated, i.e., a normal temperature, such as 15-25°C.

[0046] In the resin layer (A) 11, the ratio of polyvinylidene chloride content to the total mass of the resin layer (A) 11 is preferably 20% by mass or less, and may be, for example, 15% by mass or less, 10% by mass or less, 5% by mass or less, or 3% by mass or less. On the other hand, the aforementioned ratio is 0% by mass or more.

[0047] The resin layer (B) 13 contains a resin other than polyvinyl chloride. Examples of resins other than polyvinyl chloride contained in the resin layer (B) 13 include polyvinylidene chloride, polyethylene, and polypropylene.

[0048] Examples of polyethylene included in the resin layer (B) 13 include low-density polyethylene (LDPE), linear low-density polyethylene (LLDPE), metallocene-catalyzed linear low-density polyethylene (mLLDPE), medium-density polyethylene (MDPE), and high-density polyethylene (HDPE). Of these, low-density polyethylene (LDPE), linear low-density polyethylene (LLDPE), and metallocene-catalyzed linear low-density polyethylene (mLLDPE) are preferred.

[0049] In this specification, the densities of low-density polyethylene, linear low-density polyethylene, and metallocene-catalyzed linear low-density polyethylene are defined as 0.910 g / cm³. 3 More than 0.945g / cm 3 It is less than. The density of medium-density polyethylene (MDPE) is 0.945 g / cm³. 3 More than 0.955g / cm 3 It is less than. The density of high-density polyethylene (HDPE) is 0.955 g / cm³. 3 That's all.

[0050] Examples of polypropylene contained in the resin layer (B) 13 include homopolypropylene (hPP), propylene-ethylene random copolymer (also known as polypropylene random copolymer, rPP), propylene-ethylene block copolymer (also known as polypropylene block copolymer, bPP), and ethylene-propylene terpolymer (also known as ethylene-propylene terpolymer, EPT). Of these, propylene-ethylene random copolymer (also known as polypropylene random copolymer, rPP) is preferred.

[0051] In other words, the resin layer (B) 13 contains a resin other than polyvinyl chloride, preferably polyvinylidene chloride, polyethylene, or polypropylene, and more preferably polyvinylidene chloride, low-density polyethylene, linear low-density polyethylene, metallocene-catalyzed linear low-density polyethylene, or polypropylene random copolymer.

[0052] The resin layer (B) 13 may or may not contain any other components that are not polyvinylidene chloride, polyethylene, or polypropylene. The other components contained in the resin layer (B) 13 may consist of only one type or two or more types, and if there are two or more types, their combination and ratio can be arbitrarily selected according to the purpose.

[0053] The other components contained in the resin layer (B) 13 may be either resin components or non-resin components.

[0054] The resin component in the resin layer (B) 13 is not particularly limited as long as it is a resin that does not fall under any of polyvinylidene chloride, polyethylene, or polypropylene. However, it is preferable that the resin component is something other than polyvinyl chloride.

[0055] Among the other components contained in the resin layer (B) 13, the non-resin components include, for example, various additives known in the art, such as antifogging agents, antiblocking agents, antioxidants, antistatic agents, crystal nucleating agents, inorganic particles, viscosity reducers, viscosity thickeners, heat stabilizers, lubricants, infrared absorbers, and ultraviolet absorbers.

[0056] In the resin layer (B) 13, the ratio of the content of resins other than polyvinyl chloride to the total mass of the resin layer (B) 13 ([Content of resins other than polyvinyl chloride in resin layer (B) 13 (parts by mass)] / [Total mass of resin layer (B) 13 (parts by mass)] × 100) is preferably 80% by mass or more, and may be, for example, 85% by mass or more, 90% by mass or more, 95% by mass or more, and 97% by mass or more. On the other hand, the aforementioned ratio is 100% by mass or less.

[0057] In other words, in the resin layer (B) 13, the ratio of polyvinyl chloride content to the total mass of the resin layer (B) 13 is preferably 20% by mass or less, and may be, for example, 15% by mass or less, 10% by mass or less, 5% by mass or less, or 3% by mass or less. On the other hand, the aforementioned ratio is 0% by mass or more.

[0058] In the resin layer (B) 13, the ratio of the total content of polyvinylidene chloride, polyethylene, and polypropylene to the total mass of the resin layer (B) 13 is preferably 80% by mass or more, for example, 85% by mass or more, 90% by mass or more, 95% by mass or more, and 97% by mass or more. On the other hand, the aforementioned ratio is 100% by mass or less.

[0059] <When resin layer (A) 11 contains polyvinylidene chloride> Next, we will explain the case where the resin layer (A) 11 contains polyvinylidene chloride.

[0060] The resin layer (A) 11 may or may not contain other components other than polyvinylidene chloride, as long as it does not impair the effects of the present invention. The other components contained in the resin layer (A) 11 may consist of only one type or two or more types. If there are two or more types, their combination and ratio can be arbitrarily selected according to the purpose.

[0061] The other components contained in the resin layer (A) 11 may be either resin components or non-resin components.

[0062] Of the other components contained in the resin layer (A) 11, the resin component is not particularly limited as long as it is a resin other than polyvinylidene chloride. However, it is preferable that the resin component is other than polyvinyl chloride.

[0063] Among the other components contained in the resin layer (A) 11, the non-resin components include, for example, various additives known in the field, such as antifogging agents, antiblocking agents, antioxidants, antistatic agents, crystal nucleating agents, inorganic particles, viscosity reducers, viscosity thickeners, heat stabilizers, lubricants, infrared absorbers, and ultraviolet absorbers.

[0064] In the resin layer (A) 11, the ratio of the polyvinylidene chloride content to the total mass of the resin layer (A) 11 ([Polyvinylidene chloride content in resin layer (A) 11 (parts by mass)] / [Total mass of resin layer (A) 11 (parts by mass)] × 100) is preferably 80% by mass or more, and may be, for example, 85% by mass or more, 90% by mass or more, 95% by mass or more, and 97% by mass or more. On the other hand, the aforementioned ratio is 100% by mass or less.

[0065] In the resin layer (A) 11, the ratio of polyvinyl chloride content to the total mass of the resin layer (A) 11 is preferably 20% by mass or less, and may be, for example, 15% by mass or less, 10% by mass or less, 5% by mass or less, or 3% by mass or less. On the other hand, the aforementioned ratio is 0% by mass or more.

[0066] The resin layer (B) 13 contains a resin other than polyvinylidene chloride. Examples of resins other than polyvinylidene chloride contained in the resin layer (B) 13 include polyvinyl chloride, polyethylene, and polypropylene.

[0067] Examples of polyethylene included in the resin layer (B) 13 include low-density polyethylene (LDPE), linear low-density polyethylene (LLDPE), metallocene-catalyzed linear low-density polyethylene (mLLDPE), medium-density polyethylene (MDPE), and high-density polyethylene (HDPE). Of these, low-density polyethylene (LDPE), linear low-density polyethylene (LLDPE), and metallocene-catalyzed linear low-density polyethylene (mLLDPE) are preferred.

[0068] Examples of polypropylene contained in the resin layer (B) 13 include homopolypropylene (hPP), propylene-ethylene random copolymer (also known as polypropylene random copolymer, rPP), propylene-ethylene block copolymer (also known as polypropylene block copolymer, bPP), and ethylene-propylene terpolymer (also known as ethylene-propylene terpolymer, EPT). Of these, propylene-ethylene random copolymer (also known as polypropylene random copolymer, rPP) is preferred.

[0069] In other words, the resin layer (B) 13 contains a resin other than polyvinylidene chloride, preferably polyvinyl chloride, polyethylene, or polypropylene, and more preferably polyvinyl chloride, low-density polyethylene, linear low-density polyethylene, metallocene-catalyzed linear low-density polyethylene, or polypropylene random copolymer.

[0070] The resin layer (B) 13 may or may not contain any other components that are not polyvinyl chloride, polyethylene, or polypropylene. The other components contained in the resin layer (B) 13 may consist of only one type or two or more types, and if there are two or more types, their combination and ratio can be arbitrarily selected according to the purpose.

[0071] The other components contained in the resin layer (B) 13 may be either resin components or non-resin components.

[0072] The resin component in the resin layer (B) 13 is not particularly limited as long as it is a resin that does not fall under any of polyvinyl chloride, polyethylene, or polypropylene. However, it is preferable that the resin component is something other than polyvinylidene chloride.

[0073] Among the other components contained in the resin layer (B) 13, the non-resin components include, for example, various additives known in the art, such as antifogging agents, antiblocking agents, antioxidants, antistatic agents, crystal nucleating agents, inorganic particles, viscosity reducers, viscosity thickeners, heat stabilizers, lubricants, infrared absorbers, and ultraviolet absorbers.

[0074] In the resin layer (B) 13, the ratio of the content of resins other than polyvinylidene chloride to the total mass of the resin layer (B) 13 ([Content of resins other than polyvinylidene chloride in resin layer (B) 13 (parts by mass)] / [Total mass of resin layer (B) 13 (parts by mass)] × 100) is preferably 80% by mass or more, and may be, for example, 85% by mass or more, 90% by mass or more, 95% by mass or more, and 97% by mass or more. On the other hand, the aforementioned ratio is 100% by mass or less.

[0075] In other words, in the resin layer (B) 13, the ratio of polyvinylidene chloride content to the total mass of the resin layer (B) 13 is preferably 20% by mass or less, and may be, for example, 15% by mass or less, 10% by mass or less, 5% by mass or less, or 3% by mass or less. On the other hand, the aforementioned ratio is 0% by mass or more.

[0076] In the resin layer (B) 13, the ratio of the total content of polyvinyl chloride, polyethylene, and polypropylene to the total mass of the resin layer (B) 13 is preferably 80% by mass or more, and may be, for example, 85% by mass or more, 90% by mass or more, 95% by mass or more, and 97% by mass or more. On the other hand, the aforementioned ratio is 100% by mass or less.

[0077] <Adhesive layer> The adhesive layer (C) 12 contains an olefin-based adhesive and an ester-based adhesive.

[0078] Examples of the olefin-based adhesive include polyolefin resins (adhesive resins obtained using olefins as monomer components).

[0079] The polyolefin resin is a resin having structural units derived from olefins, and is preferably a modified polyolefin, more preferably an acid-modified polyolefin having acidic groups, or an acid-modified polyolefin having groups in which the acidic groups have been anhydroused. Examples of the polyolefin resin include ethylene copolymers, propylene copolymers, butene copolymers, and modified products of these copolymers (in other words, modified copolymers). The polyolefin resin is preferably a random copolymer, graft copolymer, or block copolymer in terms of improved adhesion.

[0080] The ethylene copolymer comprises a constituent unit derived from ethylene and a constituent unit derived from another monomer that does not correspond to either ethylene or propylene. Examples of the ethylene-based copolymer include ethylene-butene copolymers. Examples of the ethylene copolymer contained in the adhesive layer (C) 12 include these ethylene copolymers and their modified products (modified copolymers).

[0081] The propylene copolymer comprises a structural unit derived from propylene and a structural unit derived from another monomer that is neither ethylene nor propylene. Examples of the propylene copolymer include copolymers of propylene and vinyl group-containing monomers, and modified products thereof (modified copolymers). Examples of the propylene copolymer contained in the adhesive layer (C) 12 include maleic anhydride graft-modified linear low-density polypropylene and propylene-based thermoplastic elastomers.

[0082] Examples of the butene-based copolymer contained in the adhesive layer (C) 12 include copolymers of 1-butene and vinyl group-containing monomers, copolymers of 2-butene and vinyl group-containing monomers, and modified products (modified copolymers) of these copolymers.

[0083] The number-average molecular weight (Mn) of the olefin-based adhesive is preferably 10,000 or more. When the number-average molecular weight is above the lower limit, the adhesive strength of the olefin-based adhesive becomes greater.

[0084] In this specification, "number-average molecular weight" refers to the polystyrene equivalent value measured by gel permeation chromatography (GPC), unless otherwise specified.

[0085] In the adhesive layer (C) 12, the ratio of the olefin-based adhesive content to the total mass of the adhesive layer (C) 12 is preferably 50% by mass or more and 90% by mass or less, more preferably 70% by mass or more and 90% by mass or less, and even more preferably 80% by mass or more and 90% by mass or less. When the ratio is above the lower limit, the adhesion of the laminated film 1 is improved. When the ratio is below the upper limit, the solvent release properties of the laminated film 1 are improved.

[0086] The olefin-based adhesive contained in the adhesive layer (C) 12 may be one type or two or more types, and if there are two or more types, their combination and ratio can be arbitrarily selected according to the purpose.

[0087] Examples of the ester-based adhesive include polyester resins.

[0088] The polyester resin is a reaction product of a dicarboxylic acid and a glycol, and comprises structural units derived from the dicarboxylic acid and structural units derived from the glycol. Examples of the dicarboxylic acid include terephthalic acid, isophthalic acid, adipic acid, and sebacic acid. Examples of the glycol include ethylene glycol, neopentyl glycol, propylene glycol, and butanediol.

[0089] The number-average molecular weight (Mn) of the ester-based adhesive is preferably 10,000 or more. When the number-average molecular weight is above the lower limit, the adhesive strength of the olefin-based adhesive becomes greater.

[0090] In the adhesive layer (C) 12, the ratio of the ester-based adhesive content to the total mass of the adhesive layer (C) 12 is preferably 10% by mass or more and 50% by mass or less, more preferably 10% by mass or more and 30% by mass or less, and even more preferably 10% by mass or more and 20% by mass or less. When the ratio is above the lower limit, the solvent release properties of the laminated film 1 are improved. When the ratio is below the upper limit, the adhesion properties of the laminated film 1 are improved.

[0091] In the adhesive layer (C) 12, the ratio of the total content of the ester-based adhesive and the olefin-based adhesive to the total mass of the adhesive layer (C) 12 is preferably 80% by mass or more, and may be, for example, 85% by mass or more, 90% by mass or more, 95% by mass or more, and 97% by mass or more. On the other hand, the aforementioned ratio is 100% by mass or less.

[0092] The ester-based adhesive contained in the adhesive layer (C) 12 may be one type or two or more types, and if there are two or more types, their combination and ratio can be arbitrarily selected according to the purpose.

[0093] In the adhesive layer (C) 12, the mass ratio of the olefin-based adhesive to the ester-based adhesive is preferably 5:5 to 9:1, more preferably 7:3 to 9:1, and even more preferably 8:2 to 9:1. When the mass ratio is above the lower limit, the adhesion of the laminated film 1 is improved. When the mass ratio is below the upper limit, the solvent release properties of the laminated film 1 are improved.

[0094] The adhesive layer (C) 12 may or may not contain other components that are neither olefin-based adhesives nor ester-based adhesives, as long as they do not impair its adhesive properties. The other components contained in the adhesive layer (C) 12 may consist of only one type or two or more types, and if there are two or more types, their combination and ratio can be arbitrarily selected according to the purpose.

[0095] The other components included in the adhesive layer (C) 12 may be either resin components or non-resin components.

[0096] Of the other components contained in the adhesive layer (C) 12, the resin component is not particularly limited as long as it is a resin that does not fall under either olefin-based adhesives or ester-based adhesives.

[0097] Among the other components contained in the adhesive layer (C) 12, the non-resin component may include, for example, a solvent and the same non-resin component contained in the resin layer (A) 11. Examples of the aforementioned solvent include water.

[0098] When the other component is the solvent, the ratio of the solvent content (parts by mass) to the total mass (parts by mass) of the adhesive layer (C) 12 is preferably 5% by mass or more and 25% by mass or less, more preferably 10% by mass or more and 20% by mass or less, and even more preferably 15% by mass or more and 20% by mass or less. When the ratio is above the lower limit, good adhesion is achieved, and when the ratio is below the upper limit, good wettability to the substrate is achieved, resulting in a uniform coating film.

[0099] If the other component is a component other than a solvent, the ratio of the content (parts by mass) of the other component other than a solvent to the total mass (parts by mass) of the adhesive layer (C) 12 is preferably 25% by mass or less, and may be, for example, 20% by mass or less, 15% by mass or less, 10% by mass or less, or 5% by mass or less.

[0100] In laminated film 1, the amount of adhesive layer (C) 12 formed is 0.5 to 3.0 g / m². 2 Preferably, it is 0.5 to 1.5 g / m 2 , and 1.5~3.0g / m 2 Either of these is acceptable. When the amount formed is greater than or equal to the lower limit, the peel strength between resin layer (A) 11 and resin layer (B) 13 becomes greater. Furthermore, when a molded body such as a base material, described later, is made using the laminated film 1, even if the thickness of the adhesive layer (C) 12 becomes thinner in the molded part of the molded body, the high peel strength between resin layer (A) 11 and resin layer (B) 13 is maintained. When the amount formed of adhesive layer (C) 12 is less than or equal to the upper limit, the laminated film 1 becomes more effective in suppressing the so-called tunneling phenomenon, where tunnel-shaped voids form between resin layer (A) 11 and resin layer (B) 13, and the overflow of adhesive layer (C) 12 from the edge of the laminated film 1.

[0101] <Other layers> The laminated film 1 may or may not include any other layer that does not fall under any of the resin layer (A) 11, the adhesive layer (C) 12, or the resin layer (B) 13, as long as it does not impair the effects of the present invention. The types, placement positions, number, and thickness of the other layers mentioned above are not particularly limited and can be arbitrarily selected according to the purpose.

[0102] <Example of laminated film (I)> The laminated film (I) may have two or more laminated structures comprising a resin layer (A), an adhesive layer (C), and a resin layer (B).

[0103] Figures 2A to 2D are schematic cross-sectional views illustrating several other specific examples of the laminated film according to this embodiment.

[0104] As shown in Figure 2A, the laminated film 2 comprises a resin layer (A1) 211, an adhesive layer (C1) 221, a resin layer (B1) 231, an adhesive layer (C2) 222, a resin layer (A2) 212, an adhesive layer (C3) 223, a resin layer (B2) 232, an adhesive layer (C4) 224, and a resin layer (A3) 213. For example, resin layer (A1) 211 may contain polyvinyl chloride (PVC), resin layer (B1) 231 may contain polyvinylidene chloride (PVDC), resin layer (A2) 212 may contain low-density polyethylene, resin layer (B2) 232 may contain polyvinylidene chloride (PVDC), and resin layer (A3) 213 may contain polyvinyl chloride (PVC). However, the combination of resins contained in each layer is not limited to this.

[0105] As shown in Figure 2B, the laminated film 3 comprises a resin layer (A1) 311, an adhesive layer (C2) 321, a resin layer (B2) 331, an adhesive layer (C3) 322, a resin layer (A2) 312, an adhesive layer (C4) 323, and a resin layer (B3) 332. For example, resin layer (A1) 311 may contain polyvinyl chloride (PVC), resin layer (B2) 331 may contain low-density polyethylene, resin layer (A2) 312 may contain polyvinylidene chloride (PVDC), and resin layer (B3) 332 may contain polyvinyl chloride (PVC). Such a laminated film 3 is, for example, obtained by removing the adhesive layer (C1) 221 and the resin layer (B1) 231 from the laminated film 2. However, the combination of resins contained in each layer is not limited to this.

[0106] As shown in Figure 2C, the laminated film 4 may comprise a resin layer (A1) 411, an adhesive layer (C2) 421, a resin layer (B2) 431, an adhesive layer (C3) 422, and a resin layer (A2) 412. In other words, Figure 2C is obtained by removing the adhesive layer (C4) 323 and the resin layer (B3) 332 from Figure 2B. For example, resin layer (A1) 411 may contain polyvinyl chloride (PVC), resin layer (B2) 431 may contain low-density polyethylene, and resin layer (A2) 412 may contain polyvinylidene chloride (PVDC).

[0107] As shown in Figure 2D, the laminated film 5 may comprise a resin layer (A1) 511, an adhesive layer (C3) 521, and a resin layer (B2) 531. In other words, Figure 2D is obtained by removing the adhesive layer (C2) 421 and the resin layer (B2) 431 from Figure 2C. For example, resin layer (A1) 511 may contain polyvinyl chloride (PVC), and resin layer (B2) 531 may contain polyvinylidene chloride (PVDC).

[0108] The laminated film (I) is not limited to the embodiments described above, and some components may be modified, deleted, or added without departing from the spirit of the present invention.

[0109] <<Method for manufacturing laminated film (I)>> The laminated film (I) is obtained, for example, by forming a coating layer by applying an adhesive to one side of a resin layer (A) or a resin layer (B), using an olefin-based adhesive or an ester-based adhesive as the adhesive, and by bonding one side of the resin layer (B) to the exposed side of the coating layer (the side opposite to the side of the resin layer (A) or the resin layer (B)) if the coating layer is formed on the resin layer (A), or by bonding one side of the resin layer (A) if the coating layer is formed on the resin layer (B), thereby producing a laminate film, and allowing the laminate film to age (sometimes referred to as "coating process" in this specification).

[0110] When performing the aforementioned coating process, the heating temperature during the application of the olefin-based adhesive and the ester-based adhesive is preferably 15°C to 40°C, and more preferably 20°C to 30°C. When performing the coating process, the coating amounts of the olefin-based adhesive and the ester-based adhesive on the resin layer (A) or the resin layer (B) are preferably 0.5 g / m 2 ~3.0 g / m 2 and more preferably 1.0 g / m 2 ~2.0 g / m 2 . When performing the coating process, the conveyance speeds of the resin layer (A) and the resin layer (B) are preferably 30 m / min to 150 m / min, and more preferably 50 m / min to 100 m / min.

[0111] As described above, when manufacturing the laminated film (I), an adhesive may be applied to the resin layer (A), and then the resin layer (B) may be laminated on the exposed surface of the coated layer. Alternatively, an adhesive may be applied to the resin layer (B), and then the resin layer (A) may be laminated on the exposed surface of the coated layer. However, in the present embodiment, it is preferable to apply the adhesive to the resin layer having the rougher coated surface of the adhesive among the resin layer (A) and the resin layer (B). By doing so, the effect of suppressing the generation of voids between the resin layer (A) or the resin layer (B) and the adhesive layer (C) is enhanced.

[0112] The resin layer (A), the adhesive layer (C), and the resin layer (B) can also be manufactured by forming them into a film shape by a known method such as melt extrusion using the resin or resin composition as the forming material. The resin composition may be manufactured by adjusting the types and contents of the contained components so that the layer to be formed contains the target components in the target contents. For example, the ratio of the contents of the components that do not vaporize at room temperature in the resin composition is usually the same as the ratio of the contents of the components in the layer formed from this resin composition.

[0113] Examples of resin compositions for forming resin layer (A) include a resin composition comprising polyvinyl chloride and, if necessary, the other components. In this case, examples of resin compositions for forming resin layer (B) include a resin other than polyvinyl chloride (for example, polyvinylidene chloride, polyethylene, or polypropylene) and, if necessary, the other components.

[0114] Alternatively, an example of a resin composition for forming resin layer (A) is a resin composition comprising polyvinylidene chloride and, if necessary, the other components. In this case, an example of a resin composition for forming resin layer (B) is a resin composition comprising a resin other than polyvinylidene chloride (for example, polyvinyl chloride, polyethylene, or polypropylene) and, if necessary, the other components.

[0115] If the laminated film (I) includes the other layer, the desired laminate can be manufactured by laminating the other layer to any of the layers at an appropriate timing in the manufacturing method described above, depending on the type of the other layer, or by forming the other layer on the laminate film or laminated film obtained by the manufacturing method described above using a known method.

[0116] <<Packaging>> The packaging according to one embodiment of the present invention is constructed using the laminated film according to the above embodiment of the present invention. Therefore, the packaging of this embodiment does not contain benzenes and has good adhesion and solvent release properties.

[0117] A preferred example of a packaging body according to this embodiment is a packaging body comprising a lid material and a bottom material, wherein the packaging body is constructed by sealing the lid material and the bottom material, and the bottom material is constructed using the laminated film.

[0118] Figure 3 is a schematic perspective view showing an example of the packaging according to this embodiment. Figure 4 is a cross-sectional view of the packaging shown in Figure 3 along the line IV-IV. The packaging 101 shown here is a PTP (Press-Through Packaging) blister pack, and is composed of a lid material 8 and a bottom material 9. The planar shape of the packaging 101 is rectangular. The lid material 8 is preferably an aluminum sheet. The base material 9 is made using a laminated film according to the above-described embodiment of the present invention, and more specifically, it is a molded body of the laminated film.

[0119] The base material 9 has multiple recesses 91 that protrude from one side of the base material 9 (sometimes referred to as the "first side" in this specification) 9a and have openings on the other side of the base material 9 (sometimes referred to as the "second side" in this specification) 9b. In the packaging 101, the base material 9 is positioned with its second side 9b facing the lid material 8, and the first side 9a of the base material 9 is one of the outermost surfaces (exposed surfaces) of the packaging 101.

[0120] If the base material 9 is a molded body of the laminated film 1 shown in Figure 1, then either the first surface 1a (the first surface 13a of the resin layer (B) 13) or the second surface 1b (the second surface 11b of the resin layer (A) 11) of the laminated film 1 corresponds to the first surface 9a of the base material 9, and the other corresponds to the second surface 9b of the base material 9.

[0121] One side of the lid material 8 (sometimes referred to as the "first side" in this specification) 8a is the other outermost surface (exposed surface) of the packaging body 101, and in the packaging body 101, the lid material 8 is positioned with its other side (sometimes referred to as the "second side" in this specification) 8b facing the bottom material 9 side.

[0122] The packaging body 101 is constructed by sealing (heat sealing) the second surface 8b of the lid material 8 and the area of ​​the second surface 9b of the bottom material 9 where the recess 91 is not provided. The area of ​​the second surface 9b of the bottom material 9 where the recess 91 is provided is not sealed with the second surface 8b of the lid material 8, and in this area, the storage section 198 is formed by the second surface 9b of the bottom material 9 and the second surface 8b of the lid material 8. The contents 7 are sealed and stored in the storage compartment 198 of the packaging 101.

[0123] The opening of the recess 91 is circular or nearly circular (approximately circular). In this specification, "nearly circular" means a shape that is not circular but is approximately circular in nature, and cannot be clearly recognized as non-circular by visual inspection. The bottom surface of the recess 91 may be either flat or non-flat (e.g., curved). In the recess 91, when a cross-section is formed in a direction parallel to the surface of the flat portion (area without recess) of the base material 9, it is preferable that the opening of the recess 91 (cross-sectional opening) is similar in shape to the above-mentioned opening, that is, circular or nearly circular.

[0124] The inner diameter of the opening of the recess 91 is preferably 7.0 mm to 15.0 mm. The depth of the recess 91 is preferably 3.0 mm to 10.0 mm. If the bottom surface of the recess 91 is not flat, the depth at the deepest part of the recess is preferably within the above numerical range.

[0125] A slit 92 is formed on the first surface 9a side of the base material 9. More specifically, in the base material 9, multiple slits 92 are formed parallel to each other in the width direction of the packaging body 101. Each slit 92 is formed across the entire width of the packaging body 101. The presence of the slits 92 allows the packaging body 101 to be easily divided into specific numbers of storage compartments 198, thereby increasing the convenience of the packaging body 101.

[0126] The thickness of the flat portion of the base material 9 may be, for example, the same as the thickness of the laminated film described above. The thickness of the lid material 8 is preferably 15 μm to 90 μm, and more preferably 17 μm to 40 μm.

[0127] The contents of container 7 are preferably tablets. Examples of tablets include those that have physical properties similar to those of ordinary pharmaceuticals, such as hardness.

[0128] The packaging of this embodiment is not limited to the above-described form, and some components may be modified, deleted, or added without departing from the spirit of the present invention. For example, in the packaging 101, two rows of storage compartments 198 are provided in the width direction and four rows of storage compartments 198 are provided in the length direction. However, in the packaging of this embodiment, the number of storage compartments provided in the width direction and length direction is not limited to these. For example, in the packaging 101, the opening of the recess 91 in the base material 9 is circular or nearly circular (approximately circular), but in the packaging of this embodiment, the opening of the recess in the base material may have any other shape. Similarly, when a cross-section is formed in the recess in a direction parallel to the surface (first surface) of the flat portion (area without a recess) of the base material, the opening of the recess may be circular or nearly circular, or may have any other shape. The shape of the recess can be arbitrarily set according to the shape of the contents.

[0129] <<Manufacturing method for packaging>> The aforementioned packaging can be manufactured by heat-sealing the laminated film or a molded body thereof (e.g., a base material) and the object to be sealed (e.g., a lid material) while forming a storage compartment and storing the object to be packaged within the storage compartment.

[0130] Molded laminated films, such as base materials, can be manufactured by known methods. For example, the molding temperature is preferably 80°C to 160°C, and the molding pressure is preferably 0.1 MPa to 0.5 MPa.

[0131] When heat sealing a laminated film or its molded body with the object to be sealed, the sealing temperature is preferably 170°C to 270°C, the sealing pressure is preferably 0.15 MPa to 0.6 MPa, and the sealing time is preferably 4 seconds or less. [Examples]

[0132] Hereinafter, the present invention will be described in more detail with reference to specific examples. However, the present invention is not limited to the examples shown below.

[0133] [Example 1] [Contact Angle with Respect to PVC] An adhesive (S) was prepared by mixing an olefin-based adhesive (olefin-based, "SB-5030N" manufactured by Unitika Ltd.) (34.8 g), an ester-based adhesive (saturated copolymerized polyester, "KT-0507" manufactured by Unitika Ltd.) (3.9 g), and water (11.4 g).

[0134] A polyvinyl chloride (PVC) film ("Sumilite VSS-8142-ZUV" manufactured by Sumitomo Bakelite Co., Ltd.) (thickness 250 μm, width 1040 mm) was prepared. After dropping 2 μL of the adhesive (S) onto the surface of this PVC film, at the 1-second point, the contact angle (°) with respect to PVC was measured using an automatic contact angle meter ("DropMaster series DMs-401" manufactured by Kyowa Interface Science Co., Ltd.). The results are shown in Table 1.

[0135] [Manufacture of Laminated Film] As the resin film to be the resin layer (A), the above-mentioned PVC film (thickness 250 μm, width 1040 mm) was prepared.

[0136] The adhesive (S) transferred to the gravure roll in the first coating section was applied to the surface of the PVC film fed from the first feeding section to form an adhesive layer (C). At this time, the conveyance speed of the PVC film was 50 m / min, and the coating amount of the adhesive (S) was 1.0 g / m 2 was set.

[0137] Polyvinylidene chloride (PVDC) (Saran Latex L-574C, manufactured by Asahi Kasei Corporation) was prepared as the resin for the resin layer (B). Next, the PVDC transferred to the gravure roll in the second coating section was coated to a thickness of 25 μm onto the exposed surface of the adhesive layer (C) to produce a laminated film, which was then wound into a roll. The transport speed of the PVDC film and the winding speed of the laminated film were set to be the same as the transport speed of the PVC film. As described above, a resin layer (A) containing PVC (thickness 250 μm) and an adhesive layer (C) containing adhesive (S) (formation amount 1.0 g / m²) are formed. 2 A laminated film (I) (thickness 275 μm) was obtained by laminating a resin layer (B) (thickness 25 μm) containing PVDC in this order in the thickness direction.

[0138] <<Evaluation of Laminated Films>> The laminated film (I) obtained above was stored at room temperature for one month to stabilize the adhesive strength between resin layer (A) and resin layer (B).

[0139] <Coating adhesion between resin layer (A) and resin layer (B)> The adhesion of the coating between resin layer (A) and resin layer (B) was evaluated in accordance with JIS K 5600-5-6 (cross-cut method) as follows. A test specimen measuring 100 mm or more in width and 100 mm or more in length was prepared from the long laminated film (I). Immediately thereafter, the test specimen was subjected to humidity control treatment by being left to stand for 30 minutes or more in an environment of 23°C and 50% relative humidity. The test specimen was placed on a hard, flat surface with the resin layer (B) side facing upwards. Then, cuts were manually made using a cutting tool specified in the JIS standard, penetrating to the surface of the resin layer (A) side. To form a grid pattern, an equal number of parallel cuts were made in a direction 90° to the cuts, overlapping the cuts (the number of cuts in each direction of the grid pattern was 6). A transparent pressure-sensitive adhesive tape (with an adhesive strength of 10±1N per 25mm width) was applied to the surface with the cuts, and the tape was firmly rubbed with a fingertip to ensure proper contact with the coating film. After the tape was applied, it was left for 5 minutes, and the end of the tape was grasped, and the tape was pulled off in 1.0 second, with the angle between the test piece and the tape being 60°. After the above procedure, the adhesion of the coating between resin layer (A) and resin layer (B) was evaluated according to the following criteria. The results are shown in Table 1. [Evaluation Criteria] 0: The edges of the cut are perfectly smooth, and there is no peeling at any of the grid lines. 1: There are small areas of paint peeling at the intersections of the cuts. The area affected at the cross-cuts does not clearly exceed 5%. 2: The paint film is peeling along the edges of the cuts and / or at the intersections. The affected area at the cross-cut is clearly more than 5%, but never exceeds 15%. 3: The paint film is partially or completely peeling along the edges of the cuts, and / or peeling in various parts of the grain, partially or completely. The affected area in the cross-cut section is clearly more than 15% but not more than 35%. 4: The paint film is partially or completely peeling along the edges of the cuts, and / or several areas are partially or completely peeling. The affected area in the cross-cut section does not clearly exceed 35%. 5: There is peeling that cannot be evaluated even in the above 4.

[0140] <Solvent release properties between resin layer (A) and resin layer (B)> The laminated film obtained above was immersed in acetone at room temperature or 40°C, and the time until delamination occurred between resin layer (A) and resin layer (B) was measured. The results are shown in Table 1.

[0141] <<Manufacturing and Evaluation of Laminated Films>> [Example 2] Except for preparing adhesive (S) by mixing the olefin-based adhesive (31.0 g), the ester-based adhesive (7.8 g), and water (11.2 g), the contact angle was measured and the laminated film (I) was manufactured and evaluated in the same manner as in Example 1. The results are shown in Table 1.

[0142] [Example 3] Except for preparing adhesive (S) by mixing the olefin-based adhesive (19.6 g), the ester-based adhesive (19.6 g), and water (10.8 g), the contact angle was measured and the laminated film (I) was manufactured and evaluated in the same manner as in Example 1. The results are shown in Table 1.

[0143] [Comparative Example 1] Except for preparing adhesive (S) by mixing the aforementioned olefin-based adhesive (38.5 g) and water (11.5 g), the contact angle was measured and the laminated film (I) was manufactured and evaluated in the same manner as in Example 1. The results are shown in Table 2.

[0144] [Comparative Example 2] The contact angle was measured in the same manner as in Example 1, except that adhesive (S) was prepared by mixing the ester-based adhesive (40.0 g) and water (10.0 g). Also, in the same manner as in Example 1, an attempt was made to manufacture a laminated film (I), but repulsion occurred when coating the adhesive (S) onto the surface of the PVC film, so the manufacture of the laminated film (I) was discontinued. The results are shown in Table 2.

[0145] [Reference example 1] The laminated film (I) was manufactured and evaluated in the same manner as in Example 1, except that adhesive (S) was prepared by mixing urethane adhesive (BASF's "Emuldur 381 A") (25.0 g) and water (25.0 g), and the contact angle with PVC was not measured. The results are shown in Table 2.

[0146] [Table 1]

[0147]

Table 2

[0148] As is clear from the above results, in the laminated films of Examples 1 to 3, benzenes were not contained.

[0149] In the laminated films of Examples 1 to 3, the contact angle with respect to PVC was as small as 50° to 56°, and the wettability was good. In the laminated films of Examples 1 to 3, the evaluation results of the coating film adhesion between the resin layer (A) and the resin layer (B) were all 0, which was good.

[0150] In the laminated films of Examples 1 to 3, when immersed in acetone at room temperature, the time until the resin layer (A) and the resin layer (B) were peeled off was as short as 10 minutes to 20 minutes, and the solvent peelability was good. In the laminated films of Examples 1 to 3, when immersed in acetone at 40 °C, the time until the resin layer (A) and the resin layer (B) were peeled off was as short as 2 minutes to 5 minutes, and the solvent peelability was good.

[0151] On the other hand, in the laminated film of Comparative Example 1, peeling within the above time was difficult. In the laminated film of Comparative Example 2, the contact angle was as large as 82°, and repelling occurred when applying the adhesive (S), so the production of the laminated film was stopped. In the laminated film of Reference Example 1, benzenes were contained in the urethane-based adhesive.

[0152] [Example 4] <<Contact Angle with Respect to PVC>> Similar to the case of Example 1, the adhesive (S) was prepared, and the contact angle (°) with respect to PVC was measured. The results are shown in Table 3.

[0153] <<Manufacture of Laminated Film>> As the resin film to be the resin layer (A1), the aforementioned PVC film (thickness 100 μm, width 1280 mm) was prepared.

[0154] The adhesive (S) transferred to the gravure roll in the first coating section was applied to the surface of the PVC film unwound from the first dispensing section to form an adhesive layer (C1). The transport speed of the PVC film at this time was 50 m / min, and the amount of adhesive (S) applied was 1.0 g / m². 2 That's what I decided.

[0155] Polyvinylidene chloride (PVDC) (Saran Latex L-509C, manufactured by Asahi Kasei Corporation) was prepared as the resin for the resin layer (B1). Next, the PVDC transferred to the gravure roll in the second coating section was coated to a thickness of 25 μm onto the exposed surface of the adhesive layer (C) to produce a laminated film, which was then wound into a roll. The transport speed of the PVDC film and the winding speed of the laminated film were set to be the same as the transport speed of the PVC film. As described above, a resin layer (A) containing PVC (thickness 100 μm) and an adhesive layer (C1) containing adhesive (S) (formation amount 1.0 g / m²) are formed. 2 A laminated film was obtained by laminating a resin layer (B1) (thickness 25 μm) containing PVDC in this order in the thickness direction.

[0156] As the resin for the resin layer (A2), we prepared PE (polyethylene, "Sumikasen L-211" manufactured by Sumitomo Chemical Co., Ltd.). As the resin film to be the resin layer (B2), the aforementioned PVC film (thickness 100 μm, width 1280 mm) was prepared.

[0157] The adhesive (S) transferred to the gravure roll in the first coating section was applied to the PVDC coated surface of the laminated film unwound from the first dispensing section to form an adhesive layer (C2). The transport speed of the laminated film at this time was 50 m / min, and the amount of adhesive (S) applied was 1.0 g / m². 2 That's what I decided. Simultaneously, the adhesive (S) transferred to the gravure roll in the second coating section was also applied to the PVC film that would become the resin layer (B2) fed out from the second feeding section to form an adhesive layer (C3). The transport speed of the PVC film that would become the resin layer (B2) was set to 50 m / min, and the amount of adhesive (S) applied was 1.0 g / m². 2 That's what I decided.

[0158] The die temperature was set to 300°C or higher, and a laminated film was produced by sand laminating both adhesive layer (C2) and adhesive layer (C3) with the PE, and this was wound into a roll.

[0159] As described above, a resin layer (A1) containing PVC (thickness 100 μm) and an adhesive layer (C1) containing adhesive (S) (formation amount 1.0 g / m²) are formed. 2 ) and a resin layer (B1) (thickness 24 μm) containing PVDC and an adhesive layer (C2) (forming amount 1.0 g / m²) containing adhesive (S). 2 ) and a resin layer (A2) containing PE (thickness 30 μm) and an adhesive layer (C3) containing adhesive (S) (forming amount 1.0 g / m²) 2 A laminated film (I) (thickness 255 μm) was obtained by laminating a resin layer (B2) (thickness 100 μm) containing PVC in this order in the thickness direction.

[0160] <<Evaluation of Laminated Films>> The laminated film (I) obtained above was stored at room temperature for one month to stabilize the adhesive strength between the resin layer (B1) and the resin layer (A2).

[0161] <Peel strength between resin layer (B1) and resin layer (A2)> From the long laminated film (I), a small rectangular piece with a width of 15 mm and a length of 10 cm, whose length coincided with the MD, was cut out and used as a test specimen. At one end of this test specimen along its length, the resin layer (A2) was slightly peeled from the resin layer (B1) to form a gripping portion. Immediately thereafter, this test specimen was subjected to humidity control treatment by being left to stand for 30 minutes or more in an environment of 23°C and 50% relative humidity.

[0162] Using a universal material testing machine (Orientec Co., Ltd. "RTC-1210A"), the resin layer (A2) in the gripping portion of the test piece after humidity control treatment was fixed to the upper gripping part of the machine, and the resin layer (B1) was fixed to the lower gripping part. From this state, at room temperature, with the entire resin layer (B1) fixed, the resin layer (A2) was pulled from one end towards the other end (in the length direction of the test piece) via the upper gripping part, so that the angle between the surface of resin layer (B1) that was bonded to resin layer (A2) and the surface of resin layer (A2) that was bonded to resin layer (B1) was 180°, and a peel test (180° peel) was performed in which the resin layer (A2) was peeled from the resin layer (B1) over a distance of 100 mm at a peeling speed of 50 mm / min.

[0163] The above peel test was performed on a total of 10 test specimens, and the average of the integral mean load measured for each specimen was adopted as the peel strength (N / 15mm) between resin layer (B1) and resin layer (A2). The results are shown in Table 3.

[0164] <Solvent-removable properties between resin layer (B1) and resin layer (A2)> The laminated film obtained above was immersed in acetone at room temperature, and the time until the resin layer (B1) and resin layer (A2) delaminated was measured. The results are shown in Table 3.

[0165] <<Manufacturing and Evaluation of Laminated Films>> [Example 5] Except for preparing adhesive (S) by mixing the olefin-based adhesive (31.0 g), the ester-based adhesive (7.8 g), and water (11.2 g), the contact angle was measured and the laminated film (I) was manufactured and evaluated in the same manner as in Example 4. The results are shown in Table 3.

[0166] [Example 6] Except for preparing adhesive (S) by mixing the olefin-based adhesive (19.6 g), the ester-based adhesive (19.6 g), and water (10.8 g), the contact angle was measured and the laminated film (I) was manufactured and evaluated in the same manner as in Example 4. The results are shown in Table 3.

[0167] [Comparative Example 3] Except for preparing adhesive (S) by mixing the aforementioned olefin-based adhesive (38.5 g) and water (11.5 g), the contact angle was measured and the laminated film (I) was manufactured and evaluated in the same manner as in Example 4. The results are shown in Table 4.

[0168] [Comparative Example 4] The contact angle was measured in the same manner as in Example 4, except that adhesive (S) was prepared by mixing the ester-based adhesive (40.0 g) and water (10.0 g). Also, in the same manner as in Example 4, an attempt was made to manufacture a laminated film (I), but repulsion occurred when coating the adhesive (S) onto the surface of the PVC film, so the manufacture of the laminated film (I) was discontinued. The results are shown in Table 4.

[0169] [Reference example 2] Except for the fact that adhesive (S) for the adhesive layer (C1) was prepared by mixing urethane adhesive (BASF's "Emuldur 381 A") (25.0 g) and water (25.0 g), and adhesive (S) for the adhesive layers (C2) and (C3) were prepared by mixing polyethyleneimine (PEI) adhesive (Hakuto Co., Ltd.'s "Polymaster RP") and water, the contact angle was measured and the laminated film (I) was evaluated in the same manner as in Example 4. The results are shown in Table 4.

[0170] [Table 3]

[0171] [Table 4]

[0172] As is clear from the results above, the laminated films of Examples 4 to 6 did not contain benzenes.

[0173] In the laminated films of Examples 4 to 6, the contact angle with PVC was small, ranging from 50° to 56°, and the wettability was good. In the laminated films of Examples 4 to 6, the peel strength between the resin layer (B1) and the resin layer (A2) was 3N / 15mm to 10N / 15mm, indicating good adhesion.

[0174] In the laminated films of Examples 4 to 6, when immersed in acetone at room temperature, the time until the resin layer (B1) and resin layer (B2) separated was short, at 10 to 20 minutes, indicating good solvent peelability.

[0175] In contrast, the laminated film of Comparative Example 3 did not delaminate between the resin layer (B1) and the resin layer (B2) even when immersed in acetone at room temperature, indicating poor solvent release properties. In the laminated film of Comparative Example 4, the contact angle was large at 82°, and repulsion occurred when applying the adhesive (S), so the production of the laminated film was discontinued. In the laminated film of Reference Example 2, the urethane adhesive contained benzene compounds. [Industrial applicability]

[0176] The present invention can provide a laminated film that does not contain benzenes and has good adhesion and solvent release properties, and a packaging body constructed using the laminated film. [Explanation of Symbols]

[0177] 1, 2, 3, 4, 5... Laminated film 7. Items to be stored 8...Lid material 9...Bottom material 11...Resin layer (A) 12...Adhesive layer (C) 13...Resin layer (B) 91···Concave part 92···スリット 101···Packaging 198···Storage Department 211, 311, 411, 511... Resin layer (A1) 212, 312, 412... Resin layer (A2) 213···Resin layer (A3) 221...Next layer (C1) 222, 321, 421... then layer (C2) 223, 322, 422, 521... then layer (C3) 224, 323... then layer (C4) 231···Resin Layer (B1) 232,331,431,531...Resin layer (B2) 332···Resin Layer (B3)

Claims

1. A laminated film comprising an adhesive layer (C), a resin layer (A) provided on one side of the adhesive layer (C), and a resin layer (B) provided on the other side of the adhesive layer (C), The adhesive layer (C) comprises an olefin-based adhesive and an ester-based adhesive, The resin layer (A) contains polyvinyl chloride or polyvinylidene chloride, If the resin layer (A) contains polyvinyl chloride, then the resin layer (B) contains a resin other than polyvinyl chloride. A laminated film in which, if the resin layer (A) contains polyvinylidene chloride, the resin layer (B) contains a resin other than polyvinylidene chloride.

2. If the resin layer (A) contains polyvinyl chloride, then the resin layer (B) contains polyvinylidene chloride, polyethylene, or polypropylene. The laminated film according to claim 1, wherein if the resin layer (A) contains polyvinylidene chloride, the resin layer (B) contains polyvinyl chloride, polyethylene, or polypropylene.

3. If the resin layer (A) contains polyvinyl chloride, the resin layer (B) contains polyvinylidene chloride, low-density polyethylene, linear low-density polyethylene, metallocene catalyst linear low-density polyethylene, or polypropylene random copolymer. The laminated film according to claim 2, wherein if the resin layer (A) contains polyvinylidene chloride, the resin layer (B) contains polyvinyl chloride, low-density polyethylene, linear low-density polyethylene, metallocene catalyst linear low-density polyethylene, or polypropylene random copolymer.

4. The laminated film according to claim 1 or 2, wherein the mass ratio of the olefin-based adhesive to the ester-based adhesive in the adhesive layer (C) is 9:1 to 5:

5.

5. The laminated film according to claim 1 or 2, wherein the olefin-based adhesive is a modified polyolefin.

6. The laminated film according to claim 1 or 2, wherein the laminated film has two or more laminated structures comprising the resin layer (A), the adhesive layer (C), and the resin layer (B).

7. The laminated film according to claim 1 or 2, wherein the laminated film is a laminated film for blister packs.

8. A packaging body constructed using the laminated film described in claim 1 or 2.

9. The packaging comprises a lid and a bottom, The packaging is constructed by sealing the lid material and the bottom material, The packaging body according to claim 8, wherein the bottom material is constructed using the laminated film.

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