Laminated film and packaging

Abstract

The present invention provides: a laminate film (1) for blister packs, which is provided with a base material layer (11) containing a thermoplastic resin, and which has excellent heat resistance; and a packaging body (10) provided with the laminate film (1). This laminate film (1) is for blister packs and is formed by laminating the base material layer (11), an anchor coat layer (12), and a print layer (13), in this order in the thickness direction of these layers. The base material layer (11) contains a thermoplastic resin, and the anchor coat layer (12) and the print layer (13) contain a cured product of an ultraviolet curable resin.

Description

[Technical Field]

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

[0002] BACKGROUND ART Laminated films formed by laminating a plurality of resin layers are widely used as packaging materials. On the other hand, because of their high convenience, such laminated films for packaging applications are produced and consumed in large quantities all over the world every day, generating large amounts of waste after use. From the perspective of improving the global environment, waste generation is an important issue that needs to be resolved, and in recent years, methods for reducing the amount of waste generated as well as for reusing (recycling) waste have been actively studied.

[0003] For example, if the main constituent materials of the multiple resin layers in a laminated film are the same type, there is no need to separate and reuse each resin layer separately, and the entire laminated film can be easily reused, making it more useful. As such a laminated film, for example, a polyethylene laminate for packaging materials has been disclosed, which comprises at least an oriented polyethylene film, an adhesive layer, and a heat-sealable polyethylene layer, and the adhesive layer contains a solventless adhesive (see Patent Document 1).

[0004] Foods, medicines, and the like are generally packaged in packaging such as packaging bags and containers when sold. Such packaging is required to have various performance characteristics to protect the contents, etc. For this reason, some packaging uses composite (multilayered) multilayer film moldings. Furthermore, in the field of packaging pharmaceuticals, food, and the like, PTPs (press-through packages) are widely used to package solid agents (medicines such as capsules and tablets, granular foods, and the like). A typical PTP manufacturing device is a manufacturing device 200 as shown in Fig. 5. The manufacturing device 200 includes a molding section 210 for molding a film to obtain a molded body, a storage section 220 for storing the molded body, and an adhesive section 230 for bonding a cover film to the molded body.

[0005] As a method for manufacturing a PTP, for example, it can be manufactured using manufacturing apparatus 200. Specifically, a method can be mentioned in which a film is thermoformed in molding section 210 to produce a molded body having protruding molded portions, the molded body is housed in a roll having a plurality of recesses corresponding to the protruding molded portions, such as housing section 220, and a cover film is bonded in bonding section 230 to manufacture the PTP.

[0006] Multilayer films used in packaging and molded articles thereof are required to have impact resistance and gas barrier properties in order to provide the packaging with functions such as protecting the contents. For example, Patent Document 2 discloses a method for improving impact resistance and gas barrier properties by stretching a multilayer film made of a polymer material to orient crystals in the multilayer film. Patent Document 2 also discloses a multilayer film (multilayer film molded article) with improved oxygen barrier properties and a multilayer packaging article using the same. [Prior art documents] [Patent documents]

[0007] [Patent Document 1] Japanese Patent Application Publication No. 2019-189333 [Patent Document 2] Japanese Patent Application Laid-Open No. 2007-283569 Summary of the Invention [Problem to be solved by the invention]

[0008] When manufacturing PTPs, aluminum or the like is typically used as the material for the cover film. Here, in order to reuse the entire PTP, it is conceivable to form the cover film from the same type of resin as the molded body. However, if the cover film is formed from the same type of resin as the molded body, there is a problem in that when the cover film is adhered to the molded body, the cover film melts due to the heat of the adhesive joint 230, and the cover film is taken by the adhesive joint 230 (the cover film melts and becomes thread-like, adhering to the adhesive joint 230).

[0009] The present invention has been made in consideration of the above circumstances, and an object of the present invention is to provide a laminate film for blister packs that has a base layer containing a thermoplastic resin and has excellent heat resistance, and a packaging body that includes the same. [Means for solving the problem]

[0010] In order to solve the above problems, the present invention employs the following configuration. [1] A laminated film for blister packs, the laminated film being constructed by laminating a base layer, an anchor coat layer, and a printed layer in this order in the thickness direction, the base layer containing a thermoplastic resin, and the anchor coat layer and the printed layer containing a cured product of an ultraviolet-curable resin. [2] The laminated film for blister packs described in [1], wherein the melting point of the cured product of the ultraviolet-curable resin contained in the anchor coat layer and the printing layer is 165°C or higher. [3] The laminate film for blister packs according to [1] or [2], wherein the surface of the base material layer facing the anchor coat layer is corona-treated. [4]. The laminate film for blister packs according to [1] or [2], wherein the thermoplastic resin is one or more selected from the group consisting of polyethylene, polypropylene, and polyethylene terephthalate. [5] The laminate film for blister packs according to [1] or [2], wherein the ultraviolet-curable resin is one or more selected from the group consisting of ultraviolet-curable cation-curable epoxy resins, ultraviolet-curable radical-curable acrylic resins, ultraviolet-curable radical-curable urethane resins, ultraviolet-curable radical-curable vinyl ester resins, and ultraviolet-curable radical-curable polyester-alkyd resins. [6]. The laminate film for blister packs described in [1] or [2], wherein the ratio of the total content of the same type of thermoplastic resin in the laminate film to the total content of the resin in the laminate film is 80 mass% or more. [7]. A packaging body comprising the laminate film for blister packs described in [1] or [2]. [Effects of the Invention]

[0011] According to the present invention, there are provided a laminate film for blister packs which has a base layer containing a thermoplastic resin and has excellent heat resistance, and a packaging body which includes the same. [Brief explanation of the drawings]

[0012] [Figure 1] 1 is a cross-sectional view schematically illustrating an example of a laminated film according to one embodiment of the present invention. [Figure 2] 1 is a perspective view schematically illustrating an example of a packaging body according to an embodiment of the present invention. [Figure 3] 3 is a cross-sectional view of the packaging body shown in FIG. 2 taken along line II. [Figure 4] FIG. 2 is a diagram showing the results of thermomechanical analysis (TMA) of the laminated films of Examples 1 to 3 and Comparative Example 1. [Figure 5] 1A to 1C are diagrams for explaining a method for manufacturing a PTP. DETAILED DESCRIPTION OF THE INVENTION

[0013] <<Laminated film (covering material)>> A laminated film according to one embodiment of the present invention is a laminated film for blister packs, which is constructed by laminating a base layer, an anchor coat layer, and a printed layer in this order in the thickness direction, wherein the base layer contains a thermoplastic resin, and the anchor coat layer and the printed layer contain a cured product of an ultraviolet-curable resin.

[0014] The laminate film of this embodiment is for a blister pack. The laminate film may be used as a lid material or a base material of a blister pack, but is preferably used as a lid material.

[0015] (1 second heat resistance temperature) When the laminated film is used as a lid material for a blister pack, a solid agent is filled into a base material, and the peripheral edges of the lid material and the base material are heat-sealed to produce a package, the laminated film (lid material) has high heat resistance, so that even when the lid material is adhered to a roll (adhesive section 230 in the manufacturing apparatus 200 shown in Figure 5) for one second or more, the maximum temperature (one-second heat resistance temperature) at which the lid material is not taken up by the roll (the lid material does not melt into threads and adhere to the roll) is preferably 165°C or higher, more preferably 170°C or higher, and even more preferably 175°C or higher.

[0016] The 1-second heat resistance temperature of the laminate film can be adjusted, for example, by adjusting the type and content of the components contained in each layer constituting the laminate film, as well as the thickness of each layer. In particular, the 1-second heat resistance temperature of the laminate film can be easily adjusted by adjusting the type and content of the components contained in the anchor coat layer and the printed layer, as well as the thickness of the anchor coat layer and the printed layer. For example, the 1-second heat resistance temperature can be easily increased by selecting a material with a melting point of 165°C or higher as a component of the anchor coat layer and the printed layer, increasing the content of this material, and increasing the thickness of the anchor coat layer and the printed layer.

[0017] The temperature at which the laminated film exhibits a 5% thermal expansion coefficient during thermomechanical analysis (TMA) is preferably 165°C or higher, more preferably 168°C or higher, and even more preferably 170°C or higher. When the temperature is equal to or higher than the lower limit, the heat resistance of the laminated film is further improved.

[0018] During thermomechanical analysis of the laminated film, the coefficient of thermal expansion at a temperature of 165° C. is preferably 10% or less, more preferably 5% or less, and even more preferably 3% or less. When the displacement is equal to or less than the upper limit, the heat resistance of the laminated film is further improved.

[0019] Thermomechanical analysis of laminated films can be performed in accordance with JIS K 7196 by measuring the amount of thermal expansion of a sample from the difference in the amount of thermal expansion when a standard sample and a sample to be analyzed are heated at a constant rate. Thermomechanical analysis of a laminated film can be performed, for example, by using a sample 4 mm wide, 10 mm long, and 25 μm thick and measuring the displacement (amount of thermal expansion) of this sample in the machine direction (MD) of the film.

[0020] During thermomechanical analysis of the laminate film, the temperature at which the film exhibits a 5% thermal expansion coefficient and the thermal expansion coefficient at a temperature of 165°C can be adjusted, for example, by adjusting the type and content of the components contained in each layer constituting the laminate film and the thickness of each layer. In particular, these can be adjusted by adjusting the type and content of the components contained in the anchor coat layer and the printed layer and the thickness of the anchor coat layer and the printed layer. For example, by selecting a material with a melting point of 165°C or higher as the component contained in the anchor coat layer and the printed layer and increasing the content of this material and increasing the thickness of the anchor coat layer and the printed layer, the temperature at which the film exhibits a 5% thermal expansion coefficient can be easily increased and the thermal expansion coefficient at a temperature of 165°C can be easily reduced.

[0021] (Recyclability) The recyclability of the laminated film can be adjusted by adjusting the type, amount, or thickness of the components contained in each layer constituting the laminated film. For example, in a laminate film, the recyclability of the laminate film can be further improved by increasing the ratio of the total content of the same type of thermoplastic resin in the laminate film to the total content of the resin in the laminate film.

[0022] In this specification, the term "same type of resin" refers to resins having common structural units, and is not limited to thermoplastic resins. This term refers to resins in which the ratio of the amount (moles) of the common structural units to the total amount (moles) of the structural units is 20 mol% or more. For example, homopolypropylene (hPP), random copolymer polypropylene (rPP), block copolymer polypropylene (bPP), propylene-ethylene random copolymer, propylene-ethylene block copolymer, propylene-based elastomer, etc. are all considered to be of the same type because the ratio of the amount (moles) of structural units derived from propylene to the total amount (moles) of the structural units is 20 mol% or more. On the other hand, for example, ethylene-propylene random copolymers and ethylene-propylene block copolymers, etc., in which the ratio of the amount (moles) of structural units derived from propylene to the total amount (moles) of the structural units is less than 20 mol%, are not considered to be of the same type as the homopolypropylene, etc.

[0023] In this embodiment, in both resins of the same type, the ratio of the amount (moles) of common structural units to the total amount (moles) of structural units is preferably 30 mol% or more, more preferably 40 mol% or more, and even more preferably 50 mol% or more, and may be, for example, any of 60 mol% or more, 70 mol% or more, and 80 mol% or more.

[0024] In the laminated film, the ratio of the total content (parts by mass) of the same type of thermoplastic resin in the laminated film to the total mass (parts by mass) of the resin in the laminated film is preferably 80% by mass or more, more preferably 85% by mass or more and 95% by mass or less, and even more preferably 90% by mass or more and 95% by mass or less. When the ratio is equal to or greater than the lower limit, the recyclability of the laminate film is further improved. When the ratio is equal to or less than the upper limit, the ratio of the total thickness of the anchor coat layer and the printing layer can be further increased, and the heat resistance of the laminate film can be further improved.

[0025] The total thickness of the laminated film is not particularly limited, but is preferably, for example, 25 μm to 100 μm, more preferably 25 μm to 60 μm, and even more preferably 25 μm to 40 μm.

[0026] In the laminated film, it is preferable that all of the layers constituting it (for example, from the base layer to the printed layer) are unstretched layers (films). Such unstretched laminated films are particularly excellent in formability and are suitable for constituting, for example, packaging products.

[0027] <Base material layer> The laminate film according to this embodiment includes a base layer (base layer 11 in the laminate film 1 shown in FIG. 1). The base layer imparts rigidity to the laminate film.

[0028] The substrate layer contains a thermoplastic resin, which can improve the rigidity of the laminated film. The thermoplastic resin is preferably one or more selected from the group consisting of polyethylene, polypropylene, and polyethylene terephthalate.

[0029] Examples of the polyethylene include very low density polyethylene (VLDPE), metallocene-catalyzed linear very low density polyethylene (mVLDPE), low density polyethylene (LDPE), linear low density polyethylene (LLDPE), metallocene-catalyzed linear low density polyethylene (mLLDPE), and high density polyethylene (HDPE). Linear low-density polyethylene (LLDPE) and metallocene-catalyzed linear low-density polyethylene (mLLDPE) are both types of low-density polyethylene. In this specification, unless otherwise specified, LDPE refers to low-density polyethylene that does not fall into either LLDPE or mLLDPE. Also, VLDPE refers to ultra-low density polyethylene that does not fall under mVLDPE.

[0030] In this specification, the density of very low density polyethylene (VLDPE) and metallocene-catalyzed linear very low density polyethylene (mVLDPE) is 0.91 g / cm 3 is less than. The density of low-density polyethylene (LDPE), linear low-density polyethylene (LLDPE), and metallocene-catalyzed linear low-density polyethylene (mLLDPE) is 0.91 g / cm 3 More than 0.942g / cm 3 is less than. The density of high density polyethylene (HDPE) is 0.942 g / cm 3 That's all.

[0031] The polypropylene includes, for example, polypropylene (homopolypropylene, hPP).

[0032] The polyethylene terephthalate contains ethylene glycol and terephthalic acid as its main components, and examples thereof include C-PET, A-PET, and G-PET. Other dicarboxylic acid components and glycol components may be copolymerized within the scope of the present invention. Examples of the other dicarboxylic acid components include isophthalic acid, p-β-oxyethoxybenzoic acid, 2,6-naphthalenedicarboxylic acid, 4,4'-dicarboxybenzophenone, bis-(4-carboxyphenylethane), adipic acid, sebacic acid, 5-sodium sulfoisophthalic acid, and cyclohexane-1,4-dicarboxylic acid. Examples of the other glycol components include ethylene oxide adducts of propylene glycol, butanediol, neopentyl glycol, diethylene glycol, and bisphenol A, as well as polyethylene glycol, polypropylene glycol, and polytetramethylene glycol. Other oxycarboxylic acid components, such as p-oxybenzoic acid, may also be used.

[0033] The base layer may contain only one type of thermoplastic resin, or two or more types. When two or more types are contained, the combination and ratio thereof can be selected arbitrarily depending on the purpose.

[0034] The base layer more preferably contains polypropylene as the thermoplastic resin.

[0035] The base layer may contain only the thermoplastic resin (i.e., it may consist of the thermoplastic resin), or it may contain the thermoplastic resin and other components (sometimes referred to as "other components" in this specification) (i.e., it may consist of the thermoplastic resin and the other components).

[0036] The other components contained in the base layer are not particularly limited and can be selected arbitrarily depending on the purpose, and may be, for example, either a resin component or a non-resin component. The other component, which is a resin component, is a resin other than a thermoplastic resin. Examples of the other non-resin components include additives known in the art. Examples of the additives include antifogging agents, antiblocking agents, antioxidants, antistatic agents, crystal nucleating agents, inorganic particles, viscosity reducers, thickeners, heat stabilizers, lubricants, infrared absorbers, and ultraviolet absorbers.

[0037] The ratio of the content (parts by mass) of the thermoplastic resin in the base layer to the total mass (parts by mass) of the base layer ([content (parts by mass) of the thermoplastic resin in the base layer] / [total mass (parts by mass) of the base layer]×100) is preferably 80% by mass or more, more preferably 90% by mass or more, and even more preferably 95% by mass or more, and may be, for example, 97% by mass or more or 99% by mass or more. When the ratio is equal to or greater than the lower limit, the rigidity of the base layer is further improved, and the recyclability of the laminated film is further improved. On the other hand, the proportion is 100% by mass or less. The ratio is usually the same as the ratio of the content (parts by mass) of the thermoplastic resin to the total content (parts by mass) of components that do not vaporize at room temperature in the resin composition for forming the base layer described below ([content (parts by mass) of thermoplastic resin in resin composition for forming the base layer] / [total content (parts by mass) of components that do not vaporize at room temperature in resin composition for forming the base layer] × 100). When the above-mentioned ratio condition is satisfied, the thermoplastic resin may be one or more of polyethylene, polypropylene, and polyethylene terephthalate, but is preferably polypropylene.

[0038] The substrate layer may consist of one layer (single layer) or two or more layers. When the substrate layer consists of multiple layers, these multiple layers may be the same or different from each other, and the combination of these multiple layers is not particularly limited as long as it does not impair the effects of the present invention.

[0039] The thickness of the substrate layer is preferably 10 μm or more and 85 μm or less, more preferably 15 μm or more and 50 μm or less, and even more preferably 20 μm or more and 40 μm or less. When the thickness is equal to or greater than the lower limit, the rigidity of the base material layer can be further improved. When the thickness of the base material layer is equal to or less than the upper limit, the base material layer is further prevented from becoming excessively thick. Here, "thickness of the substrate layer" means the thickness of the entire substrate layer, and for example, the thickness of a substrate layer consisting of multiple layers means the total thickness of all layers that make up the substrate layer.

[0040] The ratio of the thickness of the base layer to the thickness of the laminated film is preferably 70% or more and 80% or less, more preferably 80% or more and 90% or less, and even more preferably 90% or more and 95% or less. When the ratio is equal to or greater than the lower limit, the rigidity of the base material layer can be further improved. When the ratio is equal to or less than the upper limit, the base material layer is further prevented from becoming excessively thick.

[0041] The surface of the substrate layer on the side of the anchor coat layer described below is preferably subjected to a corona treatment. When the surface of the base layer facing the anchor coat layer is corona-treated, radicals are generated on the surface, which becomes activated, facilitating adhesion of the anchor coat layer (described later) and further preventing peeling of the anchor coat layer from the laminate film. As a result, peeling of the printed layer provided on the surface of the anchor coat layer opposite the base layer side from the laminate film can be further prevented.

[0042] The wettability of the substrate layer after the corona treatment is preferably 40 dyne or more, more preferably 45 dyne or more, and even more preferably 50 dyne or more.

[0043] <Anchor coat layer> The laminated film according to this embodiment further includes an anchor coat layer (anchor coat layer 12 in the laminated film 1 shown in FIG. 1) between the substrate layer and a printed layer described below.

[0044] When a printed layer (described later) contains a pigment, it is difficult for the printed layer to adhere to a substrate layer containing a thermoplastic resin, resulting in the problem of the printed layer peeling off from the laminate film. On the other hand, by providing an anchor coat layer between the substrate layer and the printed layer in a laminate film, the printed layer adheres to the anchor coat layer, thereby preventing the printed layer from peeling off from the laminate film. The anchor coat layer also imparts heat resistance to the laminate film.

[0045] The anchor coat layer contains a cured product of an ultraviolet curable resin, which generally has a higher melting point than thermoplastic resins, and therefore can improve the heat resistance of the laminated film.

[0046] The melting point of the cured product of the ultraviolet curable resin is preferably 165°C or higher, and more preferably 165°C or higher and 170°C or lower. When the melting point is equal to or higher than the lower limit, the heat resistance of the laminated film can be further improved. When the melting point is equal to or lower than the upper limit, the formability of the laminated film can be further improved.

[0047] The thermal conductivity of the cured product of the ultraviolet curable resin is preferably 0.10 W / m·K or more and 0.30 W / m·K or less, more preferably 0.15 W / m·K or more and 0.30 W / m·K or less, and even more preferably 0.20 W / m·K or more and 0.30 W / m·K or less. When the thermal conductivity is equal to or greater than the lower limit, the formability of the laminated film can be further improved.When the thermal conductivity is equal to or less than the upper limit, the heat resistance of the laminated film can be further improved.

[0048] The ultraviolet-curable resin is preferably one or more selected from the group consisting of ultraviolet-curable cation-curable epoxy resins, ultraviolet-curable radical-curable acrylic resins, ultraviolet-curable radical-curable urethane resins, ultraviolet-curable radical-curable vinyl ester resins, and ultraviolet-curable radical-curable polyester-alkyd resins, of which ultraviolet-curable radical-curable acrylic resins are particularly preferred.

[0049] Examples of the ultraviolet-curable radical-curable acrylic resin contained in the anchor coat layer include photopolymerizable oligomers such as urethane acrylate, epoxy acrylate, acrylic acrylate, and polyester acrylate, and photopolymerizable monomers such as polyfunctional acrylate monomers and monofunctional acrylate monomers.

[0050] The anchor coat layer may contain only one type of cured product of ultraviolet curable resin, or two or more types. When two or more types are contained, the combination and ratio thereof can be selected arbitrarily depending on the purpose.

[0051] The anchor coat layer may contain only the cured product of the ultraviolet-curable resin (i.e., it may consist of the cured product of the ultraviolet-curable resin), or it may contain the cured product of the ultraviolet-curable resin and other components (sometimes referred to as "other components" in this specification) (i.e., it may consist of the cured product of the ultraviolet-curable resin and the other components).

[0052] The other components contained in the anchor coat layer are not particularly limited and can be selected arbitrarily depending on the purpose, and may be, for example, either a resin component or a non-resin component. The other component, which is a resin component, is a resin other than the cured product of the ultraviolet curable resin. Examples of the other non-resin components include additives known in the art. Examples of the additives include antifogging agents, antiblocking agents, antioxidants, antistatic agents, crystal nucleating agents, inorganic particles, viscosity reducers, thickeners, heat stabilizers, lubricants, infrared absorbers, and ultraviolet absorbers.

[0053] The anchor coat layer may contain only one type of other component, or two or more types. When there are two or more types, the combination and ratio thereof can be selected arbitrarily depending on the purpose.

[0054] The content ratio of the cured product of the ultraviolet curable resin in the anchor coat layer relative to the total mass of the anchor coat layer is preferably 60 to 95 mass%, more preferably 80 to 95 mass%, and even more preferably 90 to 95 mass%, and may be, for example, 80 to 95 mass%. When the ratio is equal to or greater than the lower limit, the heat resistance of the laminated film can be further improved, and when the ratio is equal to or less than the upper limit, the thermosetting reaction can proceed just right. The above ratio is usually the same as the ratio of the content (parts by mass) of the cured product of the ultraviolet-curable resin to the total content (parts by mass) of components that do not vaporize at room temperature in the resin composition for forming the anchor coat layer described below.

[0055] The anchor coat layer may consist of one layer (single layer) or two or more layers. When the anchor coat layer consists of multiple layers, these multiple layers may be the same or different from each other, and the combination of these multiple layers is not particularly limited as long as it does not impair the effects of the present invention.

[0056] The thickness of the anchor coat layer is preferably 0.5 μm or more and 5 μm or less, more preferably 1 μm or more and 4 μm or less, and even more preferably 2 μm or more and 3 μm or less. When the thickness is equal to or greater than the lower limit, the heat resistance of the laminated film can be further improved. When the thickness is equal to or less than the upper limit, the anchor coat layer can be further prevented from becoming excessively thick. Here, "thickness of the anchor coat layer" means the thickness of the entire anchor coat layer, and for example, the thickness of an anchor coat layer consisting of multiple layers means the total thickness of all layers that make up the anchor coat layer.

[0057] The ratio of the thickness of the anchor coat layer to the thickness of the laminated film is preferably 2% to 10%, more preferably 3% to 8%, and even more preferably 4% to 5%. When the ratio is equal to or greater than the lower limit, the heat resistance of the laminated film can be further improved. When the thickness is equal to or less than the upper limit, the anchor coat layer can be further prevented from becoming excessively thick.

[0058] <Print layer> The laminate film according to this embodiment further includes a printed layer (printed layer 13 in the laminate film 1 shown in FIG. 1). The outer layer imparts heat resistance to the laminate film. The printed layer is preferably the outermost layer on the other side of the laminated film, and is preferably disposed on the outermost side on the other side in the stacking direction of the layers constituting the laminated film.

[0059] The print layer contains a cured product of an ultraviolet curable resin, which generally has a higher melting point than thermoplastic resins, and therefore can improve the heat resistance of the laminated film.

[0060] The melting point of the cured product of the ultraviolet curable resin may be the same as the melting point of the cured product of the ultraviolet curable resin contained in the anchor coat layer, as described above.

[0061] The thermal conductivity of the cured product of the ultraviolet curable resin may be the same as the thermal conductivity of the cured product of the ultraviolet curable resin contained in the anchor coat layer, as described above.

[0062] The ultraviolet-curable resin is preferably one or more selected from the group consisting of ultraviolet-curable cation-curable epoxy resins, ultraviolet-curable radical-curable acrylic resins, ultraviolet-curable radical-curable urethane resins, ultraviolet-curable radical-curable vinyl ester resins, and ultraviolet-curable radical-curable polyester-alkyd resins, of which ultraviolet-curable radical-curable acrylic resins are particularly preferred.

[0063] Examples of the ultraviolet-curable radical-curable acrylic resin contained in the printing layer include photopolymerizable oligomers such as urethane acrylate, epoxy acrylate, acrylic acrylate, and polyester acrylate, and photopolymerizable monomers such as polyfunctional acrylate monomers and monofunctional acrylate monomers.

[0064] The printed layer may contain only one type of cured ultraviolet-curable resin, or two or more types. When two or more types are contained, the combination and ratio thereof can be selected arbitrarily depending on the purpose.

[0065] The printed layer may contain a pigment in addition to the cured product of the ultraviolet-curable resin. When the printed layer contains a pigment, information about the solid agent contained in the package including the laminate film can be clearly displayed.

[0066] Examples of pigments include titanium oxide, carbon black, copper, and manganese. The printed layer may contain only one type of pigment, or two or more types. When two or more types are contained, the combination and ratio thereof can be selected arbitrarily depending on the purpose.

[0067] The printing layer may contain only the cured product of the ultraviolet-curable resin and the pigment (i.e., it may consist of the cured product of the ultraviolet-curable resin and the pigment), or it may contain the cured product of the ultraviolet-curable resin and the pigment and other components (sometimes referred to as "other components" in this specification) (i.e., it may consist of the cured product of the ultraviolet-curable resin and the pigment and the other components).

[0068] The other components contained in the printing layer include the same components as those contained in the anchor coat layer described above.

[0069] In the printed layer, the content of the pigment relative to the total mass of the printed layer is preferably 0.1 to 15 mass%, more preferably 0.5 to 10 mass%, and even more preferably 1 to 5 mass%. By setting the ratio to be equal to or greater than the lower limit, it is possible to more clearly display information about the solid agent contained in the package including the laminated film. By setting the ratio to be equal to or less than the upper limit, excessive use of the pigment can be further suppressed.

[0070] The content of the cured ultraviolet-curable resin in the printed layer relative to the total mass of the printed layer is preferably 70% by mass or more and 95% by mass or less, more preferably 80% by mass or more and 90% by mass or less, and may be, for example, 70% by mass or more and 80% by mass or less, 80% by mass or more and 90% by mass or less, or 90% by mass or more and 95% by mass or less. When the ratio is equal to or greater than the lower limit, the heat resistance of the laminated film can be further improved, and when the ratio is equal to or less than the upper limit, the thermosetting reaction can proceed just right. This ratio is usually the same as the ratio of the content (parts by mass) of the cured product of the ultraviolet-curable resin to the total content (parts by mass) of components that do not vaporize at room temperature in the resin composition for forming the printing layer described below.

[0071] The printed layer may consist of one layer (single layer) or two or more layers. When the printed layer consists of multiple layers, these multiple layers may be the same or different from each other, and the combination of these multiple layers is not particularly limited as long as it does not impair the effects of the present invention.

[0072] The thickness of the printed layer is preferably 1 μm or more and 15 μm or less, more preferably 2 μm or more and 10 μm or less, and even more preferably 4 μm or more and 6 μm or less. When the thickness is equal to or greater than the lower limit, the heat resistance of the laminated film can be further improved. When the thickness is equal to or less than the upper limit, the printed layer can be further prevented from becoming excessively thick. Here, "thickness of the printed layer" means the thickness of the entire printed layer; for example, the thickness of a printed layer consisting of multiple layers means the total thickness of all layers that make up the printed layer.

[0073] The ratio of the thickness of the printed layer to the thickness of the laminated film is preferably 5% to 20%, more preferably 8% to 15%, and even more preferably 10% to 12%. When the ratio is equal to or greater than the lower limit, the heat resistance of the laminated film can be further improved. When the thickness is equal to or less than the upper limit, the printed layer can be further prevented from becoming excessively thick.

[0074] <Other layers> The laminate film may also include other layers that do not fall under any of the base layer, anchor coat layer, and printed layer, such as an oxygen barrier layer, a water vapor barrier layer, a sealant layer, and a gloss layer, as long as the effects of the present invention are not impaired. The other layer is preferably a layer containing a thermoplastic resin, and the presence of such another layer can improve the recyclability of the laminated film.

[0075] The present invention will be described in detail below with reference to the drawings. Note that the drawings used in the following description may show essential parts enlarged for the sake of convenience in order to make the features of the present invention easier to understand, and the dimensional proportions of each component may not necessarily be the same as in reality.

[0076] FIG. 1 is a cross-sectional view schematically showing an example of the laminated film of the present embodiment. The laminated film 1 shown here is configured by laminating a base layer 11, an anchor coat layer 12, and a print layer 13 in this order in the thickness direction.

[0077] One surface 11b of the base material layer 11 (the surface opposite to the printed layer 13 side) is an exposed surface. One surface 13a of the printed layer 13 (the surface opposite to the substrate layer 11 side, sometimes referred to as the "first surface" in this specification) is an exposed surface.

[0078] <<Laminated film (lid material) manufacturing method>> Next, an example of a method for producing the above-mentioned laminated film (lid material) will be described. The method for producing the above-mentioned laminated film is not particularly limited, but examples include a feed block method in which raw material resins and the like are melt-extruded using several extruders, a co-extrusion T-die method such as a multi-manifold method, an air-cooled or water-cooled co-extrusion inflation method, and a lamination method.Of these, the method for producing a film using the co-extrusion T-die method is particularly preferred because it provides excellent control over the thickness of each layer.

[0079] Subsequent processes include laminating single-layer sheets or films that form each layer together using an appropriate adhesive, such as dry lamination, extrusion lamination, hot-melt lamination, wet lamination, or thermal lamination, or a combination of these methods. Lamination may also be performed by a coating method. The anchor coat layer can be formed by, for example, applying a resin composition for forming an anchor coat layer, which will be described later, and curing it by irradiating it with light such as ultraviolet light.

[0080] The above-described print layer can be laminated, for example, by printing a print layer-forming resin composition and curing it by irradiating it with light such as ultraviolet light at the same time as printing.

[0081] The resin composition for forming the anchor coat layer and the resin composition for forming the print layer may be cured simultaneously by irradiation with light such as ultraviolet light.

[0082] The resin composition used as a material for forming any layer in the laminated film may be produced by adjusting the types and contents of the components contained therein so that the layer to be formed contains the desired components in the desired amounts. 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.

[0083] Examples of resin compositions for forming a substrate layer (substrate layer 11 in the laminate film 1 shown in FIG. 1 ) (sometimes referred to herein as "resin compositions for forming a substrate layer") include those containing the thermoplastic resins described above and, if necessary, other components. The other components are the components described above.

[0084] The resin composition (sometimes referred to herein as "anchor coat layer-forming resin composition") for forming the anchor coat layer (anchor coat layer 12 in the laminate film 1 shown in FIG. 1) may contain, for example, the ultraviolet-curable resin, and, if necessary, a photopolymerization initiator, and, if necessary, other components. The other components are the components described above.

[0085] Examples of the photopolymerization initiator include various derivatives of benzophenone, acetophenone, benzoin ether, and thioxanthone.

[0086] The anchor coat layer may contain only one type of photopolymerization initiator, or two or more types. When two or more types are contained, the combination and ratio thereof can be selected arbitrarily depending on the purpose.

[0087] In the resin composition for forming an anchor coat layer, the content ratio of the photopolymerization initiator to the total mass of the resin composition for forming an anchor coat layer is preferably 0.01 mass% or more and 5 mass% or less, more preferably 0.05 mass% or more and 3 mass% or less, and even more preferably 0.1 mass% or more and 1 mass% or less. When the ratio is equal to or greater than the lower limit, the photopolymerization reaction of the anchor coat layer can be further promoted. When the ratio is equal to or less than the upper limit, the photopolymerization reaction of the anchor coat layer can proceed just right. The ratio is usually the same as the ratio of the content (parts by mass) of the photopolymerization initiator to the total content (parts by mass) of components that do not vaporize at room temperature in the resin composition for forming an anchor coat layer, which will be described later.

[0088] Examples of resin compositions (sometimes referred to herein as "resin compositions for forming a printing layer") for forming a printing layer (printing layer 13 in the laminate film 1 shown in FIG. 1) include those containing the ultraviolet-curable resin, and optionally the photopolymerization initiator, optionally the pigment, and optionally other components. The other components are the components described above.

[0089] Examples of the photopolymerization initiator contained in the resin composition for forming a print layer include the same photopolymerization initiators as those contained in the resin composition for forming an anchor coat layer, as explained above. The photopolymerization initiator contained in the resin composition for forming a print layer and the photopolymerization initiator contained in the resin composition for forming an anchor coat layer may be the same as or different from each other.

[0090] <<Packaging>> The packaging body of this embodiment is provided with the laminate film for blister packaging of this embodiment described above. The packaging body of this embodiment includes the laminate film for blister packaging of this embodiment described above, and therefore has a base layer containing a thermoplastic resin, and is excellent in heat resistance.

[0091] FIG. 2 is a perspective view that schematically shows one embodiment of a package according to the present invention, and FIG. 3 is a cross-sectional perspective view of the package shown in FIG. 2 taken along line II. In FIG. 2 and subsequent figures, the same components as those shown in the figures already described are given the same reference numerals as in the figures already described, and detailed description thereof will be omitted.

[0092] 2 and 3 is configured to include a laminated film 1 (lid material) and a molded film 2 (base material). The molded film 2 is formed with a protruding portion 2c that constitutes the storage portion 10a of the package 10. The package 10 is a PTP (Packaging Container) serving as a blister pack, and the solid agent 100 can be sealed and stored in the storage section 10a.

[0093] The other surface 2b of the formed film 2 is bonded to one surface 1a of the laminate film 1. However, the package 1 protrudes toward the one surface 2a in a partial area, and the second surface 2b of this protruding portion 2c is not bonded to the first surface 1a of the laminate film 1, and the second surface 2b of the package 1 and the first surface 1a of the laminate film 1 form a storage section 10a.

[0094] A slit 10b is formed in the laminated film 1 and the molded film 2. The slit 10b is an optional configuration and does not necessarily have to be formed, but by forming the slit 10b, the package 10 can be easily divided into specific numbers of solid agents 100 to be stored in the storage sections 10a, thereby improving the convenience of the package 10.

[0095] Here, the package 10 is shown with the protruding portion 2c having a dome-shaped top wall, but the outer shape of the protruding portion 2c is not limited to this and can be selected arbitrarily depending on the shape of the solid dosage form 100 to be stored. For example, the protruding portion 2c may be a truncated cone-shaped protruding portion having a circular, flat top wall. Furthermore, the outer shape of the protruding portion 2c may be a polygonal shape such as a triangle, a rectangle, a pentagon, or a hexagon, or may be an oval shape when the package 10 is viewed from above the protruding portion 2c side. The solid agent 100 may be a medicine such as a capsule or tablet, or a granular food product.

[0096] In addition, although the packaging body 10 shown here has ten protrusions 2c, the number of protrusions 2c is not limited to this.

[0097] The material of the molded film 2 may be the same as the thermoplastic resin contained in the base layer described above.

[0098] In the molded film 2, the ratio of the total content (parts by mass) of the same type of thermoplastic resin in the molded film 2 to the total mass (parts by mass) of the resin in the molded film 2 is preferably 85% by mass or more, more preferably 90% by mass or more, and even more preferably 95% by mass or more. When the ratio is equal to or greater than the lower limit, the recyclability of the molded film 2 is further improved.

[0099] In the packaging body (lid material and base material), the ratio of the total content (parts by mass) of the same type of thermoplastic resin in the packaging body to the total mass (parts by mass) of the resin in the packaging body is preferably 85% by mass or more, more preferably 90% by mass or more, and even more preferably 95% by mass or more. When the ratio is equal to or greater than the lower limit, the recyclability of the packaging material is further improved.

[0100] The packaging body of this embodiment is suitable for use in various applications requiring heat resistance, such as packaging bags or containers for packaging food, medicines, etc., and is more preferably used for packaging pharmaceuticals. The packaging body may be a press-through package.

[0101] <<Packaging manufacturing method>> The package of this embodiment can be produced by using the above-mentioned laminated film and laminating the laminated films together or the laminated film and another film or the like so as to form the desired solid drug storage section.

[0102] For example, the package 10 shown in FIGS. 2 and 3 can be produced using a known PTP packaging machine. More specifically, first, the formed film 2 is produced by forming the protrusions 2c on a resin film by plug forming, air-assisted plug forming, pressure forming, plug-assisted pressure forming, vacuum forming, or the like. Next, the solid agent 100 to be stored is filled into the protruding portion 2c of the molded film 2, and then the laminated film 1 is placed on the molded film 2, and the laminated film 1 and the molded film 2 are bonded together. Next, if necessary, slits 10b are formed in the laminated film 1 and the formed film 2 using a perforation blade, a half-cut blade or the like. In this way, the package 10 is obtained.

[0103] The packaging body 10 of this embodiment is provided with the laminated film 1 described above, and therefore has a base layer containing a thermoplastic resin, and is excellent in heat resistance. [Example]

[0104] The present invention will be described in more detail below with reference to specific examples, although the present invention is not limited to the examples shown below.

[0105] [Example 1] <Manufacturing of laminated film (lid material)> A laminated film having the structure shown in FIG. 1 was produced according to the following procedure. That is, a biaxially stretched polypropylene film (PP2) ("FOH-L" manufactured by Futamura Chemical Co., Ltd., thickness 25 μm) was prepared as the thermoplastic resin constituting the base layer. As the ultraviolet curable resin constituting the anchor coat layer, a UV inkjet undercoat liquid (AC1) ("Uvijet MK702" manufactured by Fujifilm Corporation) was prepared. As the ultraviolet curable resin constituting the printing layer, UV inkjet ink (AC2) ("Uvijet MKA52" manufactured by Fujifilm Corporation) was prepared.

[0106] Using a corona treatment device ("HFSS-101" manufactured by Kasuga Electric Co., Ltd.), one surface of the PP2 was subjected to corona treatment under in-line conveyance conditions so that the wettability was 40 dyne or more.

[0107] The AC1 was coated on one side of the corona-treated PP2.

[0108] The exposed surface of the AC1 obtained above was printed with AC2 using a UV inkjet printing device ("UV Inkjet Jet Press 540WV for Flexible Packaging" manufactured by Fujifilm Corporation), and at the same time, ultraviolet light with a wavelength of 360 nm was irradiated to form an anchor coat layer (thickness 1 μm) and a printing layer (thickness 3 μm).

[0109] As a result, a laminated film (covering material, thickness 29 μm) was obtained in which the base layer, anchor coat layer, and printing layer were laminated in this order in the thickness direction, and the thicknesses of each of these layers were as shown in Table 1.

[0110] <Production of molded film (base material)> A molded film was produced according to the following procedure. That is, polypropylene (PP3) ("E122V" manufactured by Prime Polymer Co., Ltd.) was prepared as the resin constituting the molded film.

[0111] The PP3 was extruded to produce a monolayer film (thickness: 250 μm).

[0112] The monolayer film obtained above was used to produce a molded film. Specifically, two rows of solid drug storage compartments, each containing five solid drug storage compartments, were formed using a blister packaging machine (CKD Corporation, "FBP-300E") protruding in the thickness direction. The monolayer film was then cut to a length of approximately 50 mm to produce a molded film (base material). The solid drug storage compartments were recesses with an inner diameter of 10 mm and a depth of 5 mm.

[0113] <Packaging production and evaluation> (1 second heat resistance temperature) The formed film (base material) obtained above was filled with a solid agent (zeolite, φ7mm x 2.1mm), and placed opposite the laminated film (lid material) obtained above. A packaging body was produced by heat-sealing the peripheral edges of the lid material and base material using a sealing machine (CKD Corporation, "FBP-300E") at a sealing temperature of 140 to 175°C and a sealing time of 1 second.

[0114] When manufacturing the package, the maximum temperature (1-second heat resistance temperature) at which the lid material is not taken up by the roll (the lid material does not melt into threads and adhere to the roll) even when the lid material is in close contact with the roll (the adhesive part 230 in the manufacturing apparatus 200 shown in FIG. 5) for 1 second or more was confirmed. The results are shown in Table 1.

[0115] (Temperature showing 5% thermal expansion coefficient, thermal expansion coefficient at 165°C) The laminated film (lid material) obtained above was subjected to thermomechanical analysis in accordance with JIS K 7196 using a thermal analyzer ("TMA7100" manufactured by Hitachi High-Tech Science Corporation). From the obtained thermomechanical analysis curve, the temperature (°C) showing a 5% thermal expansion coefficient and the thermal expansion coefficient (%) at a temperature of 165°C were determined. The results are shown in Table 1. When the coefficient of thermal expansion (%) at a temperature of 165°C is a negative value, this indicates that the laminated film has shrunk as a result of thermomechanical analysis.

[0116] (Recyclability) The recyclability of the laminated film (lid material) obtained above was evaluated according to the following criteria. The results are shown in Table 1.

[0117] (Evaluation criteria) A: In the laminate film, the ratio of the total content of the same type of thermoplastic resin in the laminate film to the total content of the resin in the laminate film was 75% by mass or more and 99% by mass or less. B: In the laminate film, the ratio of the total content of the same type of thermoplastic resin in the laminate film to the total content of the resin in the laminate film was 5% by mass or more and 74% by mass or less.

[0118] [Example 2] Except for changing the thickness of the printed layer to 5 μm, a laminated film and a package were produced in the same manner as in Example 1, and the package was evaluated. The results are shown in Table 1.

[0119] [Example 3] Except for changing the thickness of the printed layer to 7 μm, a laminated film and a package were produced in the same manner as in Example 1, and the package was evaluated. The results are shown in Table 1. The thermomechanical analysis curve is shown in FIG.

[0120] [Comparative Example 1] Except for the fact that no printed layer was provided, a laminated film and a package were produced in the same manner as in Example 1, and the package was evaluated. The results are shown in Table 1. The thermomechanical analysis curve is shown in Figure 4.

[0121] [Table 1]

[0122] As is clear from the above results, in the packaging bodies of Examples 1 to 3 and Comparative Example 1, the ratio of the total content of the same type of thermoplastic resin in the laminate film (lid material) constituting the packaging body to the total content of the resin in the laminate film was 75% by mass or more and 99% by mass or less, and all of them had excellent recyclability.

[0123] Because the packages of Examples 1 to 3 were provided with a printing layer and an anchor coat layer, they had a high 1-second heat resistance temperature of 165°C to 172°C, a high temperature showing a 5% thermal expansion coefficient of 167°C to 172°C, and a low thermal expansion coefficient at a temperature of 165°C of -10% to 1.5%, demonstrating excellent heat resistance. In particular, in Examples 1 to 3, as the thickness of the printed layer increased, the 1-second heat resistance temperature also tended to increase.

[0124] In contrast, the packaging body of Comparative Example 1 did not have a printing layer or an anchor coat layer, so its 1-second heat resistance temperature was low at 160°C, the temperature at which it showed a 5% thermal expansion coefficient was low at 161°C, and the thermal expansion coefficient at a temperature of 165°C was high at 47%, resulting in poor heat resistance.

[0125] As is clear from FIG. 4, the laminated films (covering materials) of Examples 1 to 3, which had a print layer and an anchor coat layer, had softening temperatures shifted to the higher temperature side by 6 to 12° C., and were excellent in heat resistance.

[0126] In contrast, the laminated film (lid material) of Comparative Example 1 did not have a print layer or an anchor coat layer, and therefore the softening temperature did not shift to the higher temperature side, and the heat resistance was poor. [Industrial Applicability]

[0127] The present invention can be used for packaging used for preserving food, medicines, and the like. [Explanation of symbols]

[0128] 1. Laminated film 1a...First surface of laminated film 11...Base material layer 12. Anchor coat layer 13...printing layer 2. Forming film 2a... First surface of the forming film 2b: Second side of the forming film 2c...Protruding part of the forming film 10...Packaging 10a....Package storage section 10b...Slit of packaging body 100...Solid 200...Manufacturing equipment 210...Molding section 220... Storage unit 230...Adhesive part

Claims

1. A laminated film for blister packs, The laminated film is configured by laminating a base layer, an anchor coat layer, and a printing layer in this order in the thickness direction, the base layer contains a thermoplastic resin, the anchor coat layer and the printing layer contain a cured product of an ultraviolet curable resin, The content of the thermoplastic resin in the base material layer relative to the total mass of the base material layer is 80 mass% or more, A laminated film for blister packs, in which all layers are unstretched layers, or the substrate layer is a biaxially stretched film.

2. 2. The laminate film for blister packs according to claim 1, wherein the melting point of the cured product of the ultraviolet curable resin contained in the anchor coat layer and the printed layer is 165°C or higher.

3. The laminate film for blister packs according to claim 1 or 2, wherein the surface of the base layer facing the anchor coat layer is subjected to a corona treatment.

4. 3. The laminate film for blister packs according to claim 1, wherein the thermoplastic resin is one or more selected from the group consisting of polyethylene, polypropylene, and polyethylene terephthalate.

5. 3. The blister pack laminate film according to claim 1, wherein the ultraviolet-curable resin is one or more selected from the group consisting of ultraviolet-curable cation-curable epoxy resins, ultraviolet-curable radical-curable acrylic resins, ultraviolet-curable radical-curable urethane resins, ultraviolet-curable radical-curable vinyl ester resins, and ultraviolet-curable radical-curable polyester-alkyd resins.

6. 3. The laminate film for blister packs according to claim 1, wherein the ratio of the total content of the same type of thermoplastic resin in the laminate film to the total content of resins in the laminate film is 80% by mass or more.

7. A packaging body comprising the laminate film for blister packs according to claim 1 or 2.

Images