Laminate film and packaging body

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

Laminated film and packaging

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

[0002] Laminate films formed by laminating multiple resin layers are widely used as packaging materials. However, due to their high convenience, such laminate films for packaging applications are mass-produced and consumed around 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 must be resolved. In recent years, methods for reducing waste generation and for reusing (recycling) waste have been actively studied.

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

[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, such as to protect the contents. Therefore, some packaging uses a composite (multilayered) multilayer film molded body. In the field of packaging medicines, foods, and the like, PTPs (press-through packages) are widely used to package solid formulations (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 by 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 by bonding section 230 to manufacture the PTP.

[0006] Multilayer films and molded articles thereof used in packaging 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.

[0007] JP 2019-189333 A JP 2007-283569 A

[0008] When manufacturing PTPs, aluminum or the like is typically used as the material for the cover film. To reuse the entire PTP, it is considered to construct the cover film from the same type of resin as the molded body. However, if the cover film is constructed 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 heat of the adhesive portion 230 melts the cover film, causing the cover film to be taken up by the adhesive portion 230 (the cover film melts and becomes thread-like, adhering to the adhesive portion 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.

[0010] In order to solve the above problems, the present invention employs the following configurations. [1]. A laminate film for blister packs, the laminate film being configured 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 laminate film for blister packs according to [1], wherein the cured product of the ultraviolet-curable resin contained in the anchor coat layer and the printed layer has a melting point of 165°C or higher. [3]. The laminate film for blister packs according to [1] or [2], wherein the surface of the base 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 according to [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 resins in the laminate film is 80 mass% or more. [7]. A package comprising the laminate film for blister packs according to [1] or [2].

[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.

[0012] Fig. 1 is a cross-sectional view schematically showing an example of a laminate film according to one embodiment of the present invention. Fig. 2 is a perspective view schematically showing an example of a package according to one embodiment of the present invention. Fig. 3 is a cross-sectional view taken along line II of the package shown in Fig. 2. Fig. 4 is a diagram showing the results of thermomechanical analysis (TMA) of the laminate films of Examples 1 to 3 and Comparative Example 1. Fig. 5 is a diagram for explaining a method for producing a PTP.

[0013] <<Laminated Film (Lid Material)>> A laminated film according to one embodiment of the present invention is a laminated film for blister packs, which is configured 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 a package is produced by using the laminate film as a lid material for a blister pack, filling a base material with a solid agent, and heat-sealing the peripheral edges of the lid material and the base material, the laminate film (lid material) has high heat resistance, so that even if the lid material is closely attached to a roll (adhesive portion 230 in the manufacturing apparatus 200 shown in FIG. 5 ) for 1 second or more, 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) 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, the thickness of each layer, etc. 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, and the thickness of the anchor coat layer and the printed layer, etc. For example, the 1-second heat resistance temperature can be easily increased by selecting a material having a melting point of 165°C or higher as a component of the anchor coat layer and the printed layer, increasing the content of the 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 a laminate film can be performed 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 in accordance with JIS K 7196. Thermomechanical analysis of a laminate film can be performed, for example, by using a sample having a width of 4 mm, a length of 10 mm, and a thickness of 25 μm, 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, the thickness of each layer, etc. 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, etc. 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 thereof, and by 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 laminate film can be adjusted by adjusting the type, amount, or thickness of each layer constituting the laminate film. For example, 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 not only to thermoplastic resins but also to resins having common structural units, where the ratio of the amount (moles) of the common structural units to the total amount (moles) of the structural units in both resins 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 laminate film, the ratio of the total content (parts by mass) of the same type of thermoplastic resin in the laminate film to the total mass (parts by mass) of the resin in the laminate 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 this ratio is equal to or greater than the lower limit, the recyclability of the laminate film is further improved. When this ratio is equal to or less than the upper limit, the total thickness ratio 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 25 μm or more and 100 μm or less, more preferably 25 μm or more and 60 μm or less, and even more preferably 25 μm or more and 40 μm or less.

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

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

[0028] The base layer contains a thermoplastic resin. When the base layer contains a thermoplastic resin, the rigidity of the laminated film can be improved. 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. Furthermore, VLDPE refers to very low density polyethylene that does not fall into the category of 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 The densities of low density polyethylene (LDPE), linear low density polyethylene (LLDPE) and metallocene-catalyzed linear low density polyethylene (mLLDPE) are less than 0.91 g / cm ３ Above, 0.942g / cm ３ 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 constituents, 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 substrate 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 resin component is a resin other than a thermoplastic resin. Examples of the other non-resin component 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 laminate film is further improved. On the other hand, the ratio 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 in the resin composition for forming the base layer 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, which will be described later ([content (parts by mass) of the thermoplastic resin in the resin composition for forming the base layer] / [total content (parts by mass) of components that do not vaporize at room temperature in the 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 substrate layer can be further improved. When the thickness of the substrate layer is equal to or less than the upper limit, the substrate layer is further prevented from becoming excessively thick. Here, the "thickness of the substrate layer" means the thickness of the entire substrate layer. For example, the thickness of a substrate layer consisting of multiple layers means the total thickness of all layers constituting 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 this ratio is equal to or greater than the lower limit, the rigidity of the base layer can be further improved. When this ratio is equal to or less than the upper limit, the base layer is further prevented from becoming excessively thick.

[0041] The surface of the substrate layer facing the anchor coat layer (described later) is preferably corona-treated. When the surface of the substrate layer facing the anchor coat layer is corona-treated, radicals are generated on the surface, which becomes active, 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, the printed layer provided on the surface of the anchor coat layer opposite the substrate layer side can be further prevented from peeling from the laminate film.

[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 laminate film according to this embodiment further includes an anchor coat layer (anchor coat layer 12 in the laminate 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 more 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 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 resin component is a resin other than the cured product of the ultraviolet-curable resin. Examples of the other non-resin component 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 two or more types are contained, the combination and ratio thereof can be selected arbitrarily depending on the purpose.

[0054] The proportion 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 this proportion is equal to or greater than the lower limit, the heat resistance of the laminate film can be further improved. When this proportion is equal to or less than the upper limit, the thermosetting reaction can proceed without excess or deficiency. This proportion is usually the same as the proportion of the cured product of the ultraviolet-curable resin (parts by mass) relative 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, which will be described later.

[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; 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 laminate film is preferably 2% or more and 10% or less, more preferably 3% or more and 8% or less, and even more preferably 4% or more and 5% or less. When the ratio is equal to or more than the lower limit, the heat resistance of the laminate 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] <Printed 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 provides heat resistance to the laminate film. The printed layer is preferably the other outermost layer of the laminate film, and is preferably disposed on the other outermost side in the stacking direction of the layers constituting the laminate 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 used, the combination and ratio of the cured ultraviolet-curable resins can be selected as desired 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, manganese, etc. The printed layer may contain only one type of pigment, or two or more types of pigments. When two or more types of pigments 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 UV-curable resin and the pigment (i.e., it may consist of the cured product of the UV-curable resin and the pigment), or it may contain the cured product of the UV-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 UV-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% by mass, more preferably 0.5% by mass to 10% by mass, and even more preferably 1% by mass to 5% by mass. By setting this content to be equal to or greater than the lower limit, information about the solid agent contained in the package including the laminated film can be displayed more clearly. By setting this content to be equal to or less than the upper limit, excessive use of the pigment can be further suppressed.

[0070] The content ratio of the cured product of the ultraviolet-curable resin in the printing layer relative to the total mass of the printing 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 this ratio is equal to or greater than the lower limit, the heat resistance of the laminated film can be further improved. When this ratio is equal to or less than the upper limit, the thermosetting reaction can proceed without excess or deficiency. 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 printing layer, which will be described later.

[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% or more and 20% or less, more preferably 8% or more and 15% or less, and even more preferably 10% or more and 12% 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. 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 have other layers that do not fall under any of the substrate layer, anchor coat layer, and printed layer, such as an oxygen barrier layer, a water vapor barrier layer, a sealant layer, a gloss layer, etc., within a range that does not impair the effects of the present invention. The other layers are preferably layers containing a thermoplastic resin, and the presence of such other layers can improve the recyclability of the laminate 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] 1 is a cross-sectional view schematically illustrating an example of a laminate film according to the present embodiment. The laminate film 1 shown here is configured by laminating a substrate layer 11, an anchor coat layer 12, and a printing 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 base material layer 11 side; sometimes referred to as the "first surface" in this specification) is an exposed surface.

[0078] <<Method for Producing Laminated Film (Lidding Material)>> 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. Among these, the co-extrusion T-die method is particularly preferred because it is excellent in controlling the thickness of each layer.

[0079] Subsequent processes include dry lamination, extrusion lamination, hot melt lamination, wet lamination, thermal lamination, etc., in which single-layer sheets or films forming each layer are bonded together using an appropriate adhesive, and combinations of these methods are used. Lamination may also be performed using a coating method. The anchor coat layer described above can be laminated, for example, by applying a resin composition for forming the anchor coat layer (described later) and curing it by irradiating it with light such as ultraviolet light.

[0080] The above-described printed layer can be laminated, for example, by printing a resin composition for forming a printed layer 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] The resin composition (sometimes referred to herein as a "resin composition for forming a base layer") for forming the base layer (base layer 11 in the laminate film 1 shown in FIG. 1) may contain, for example, the thermoplastic resin 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, for example, contain 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 relative to the total mass of the resin composition for forming an anchor coat layer is preferably 0.01% by mass or more and 5% by mass or less, more preferably 0.05% by mass or more and 3% by mass or less, and even more preferably 0.1% by mass or more and 1% by mass or less. When this ratio is equal to or greater than the lower limit, the photopolymerization reaction of the anchor coat layer can be further promoted. When this ratio is equal to or less than the upper limit, the photopolymerization reaction of the anchor coat layer can be allowed to proceed without excess or deficiency. The above ratio is usually the same as the ratio of the content (parts by mass) of the photopolymerization initiator relative 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] The resin composition (sometimes referred to herein as a "resin composition for forming a printing layer") for forming a printing layer (printing layer 13 in the laminate film 1 shown in FIG. 1) may contain, for example, 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] The photopolymerization initiator contained in the resin composition for forming a printing layer may be the same as the photopolymerization initiator contained in the resin composition for forming an anchor coat layer described above. The photopolymerization initiator contained in the resin composition for forming a printing layer and the photopolymerization initiator contained in the resin composition for forming an anchor coat layer may be the same or different from each other.

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

[0091] Fig. 2 is a perspective view schematically showing one embodiment of a package according to the present invention, and Fig. 3 is a perspective cross-sectional view taken along line II of the package shown in Fig. 2. In Fig. 2 and subsequent figures, components that are the same as those shown in figures that have already been described are given the same reference numerals as in those figures, 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 a storage section 10a of the package 10. The package 10 is a PTP (packaging container) serving as a blister pack, and a solid dosage form 100 can be hermetically stored in the storage section 10a.

[0093] The other surface 2b of the molded film 2 is adhered 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 adhered 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 laminate film 1 and the molded film 2. The slit 10b is an optional configuration and does not necessarily have to be formed, but the formation of the slit 10b allows the package 10 to be easily divided into sections each containing a specific number of solid agents 100 in the storage section 10a, thereby improving the convenience of the package 10.

[0095] Here, the package 10 is shown with a protrusion 2c having a dome-shaped top wall, but the outer shape of the protrusion 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 protrusion 2c may be a truncated cone-shaped protrusion 2c having a circular, flat top wall. Furthermore, when viewed from above the package 10 from the protrusion 2c side, the outer shape of the protrusion 2c may be a polygonal shape such as a triangle, square, pentagon, or hexagon, or may be an oval shape. Examples of the solid dosage form 100 include medicines such as capsules and tablets, granular foods, etc.

[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 this 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 body 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] <<Method for manufacturing package>> The package of the present embodiment can be manufactured by using the above-described laminate film and bonding the laminate films together or the laminate film and another film, etc., so as to form the desired solid drug storage section.

[0102] For example, the package 10 shown in Figures 2 and 3 can be manufactured using a known PTP packaging machine. More specifically, first, a protruding portion 2c is formed in a resin film by plug forming, air-assisted plug forming, pressure forming, plug-assisted pressure forming, vacuum forming, or the like, to produce a molded film 2. Next, the solid agent 100 to be preserved is filled into the protruding portion 2c of the molded film 2, and then the laminated film 1 and the molded film 2 are overlapped to bond the laminated film 1 and the molded film 2. Next, if necessary, a slit 10b is formed in the laminated film 1 and the molded film 2 using a perforation blade, a half-cut blade, or the like. In this manner, 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 material layer containing a thermoplastic resin, and is excellent in heat resistance.

[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] <Production of Laminated Film (Lidding Material)> A laminated film having the configuration shown in FIG. 1 was produced by the following procedure. Specifically, a biaxially oriented polypropylene film (PP2) (Futamura Chemical Co., Ltd., "FOH-L", thickness 25 μm) was prepared as the thermoplastic resin constituting the base layer. A UV inkjet undercoat liquid (AC1) (Fujifilm Corporation, "Uvijet MK702") was prepared as the UV curable resin constituting the anchor coat layer. A UV inkjet ink (AC2) (Fujifilm Corporation, "Uvijet MKA52") was prepared as the UV curable resin constituting the printing layer.

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

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

[0108] On the exposed surface of the AC1 obtained above, AC2 was printed using a UV inkjet printing device ("UV inkjet for flexible packaging Jet Press 540WV" manufactured by Fujifilm Corporation), and at the same time, ultraviolet light having 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 by the following procedure: That is, polypropylene (PP3) ("E122V" manufactured by Prime Polymer Co., Ltd.) was prepared as a resin constituting the molded film.

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

[0112] A molded film was produced using the monolayer film obtained above. Specifically, two rows of solid drug storage compartments, each with five compartments per row, 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] <Production and Evaluation of Package> (1-Second Heat Resistance Temperature) A solid agent (zeolite, φ7 mm × 2.1 mm) was filled into the molded film (base material) obtained above, and the molded film (base material) was placed opposite the laminated film (lid material) obtained above. A package was produced by heat-sealing the peripheral edges of the lid material and base material using a sealing machine ("FBP-300E" manufactured by CKD Corporation) under conditions of 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 was not taken by the roll (the lid material did not melt into threads and adhere to the roll) even when the lid material was 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 a temperature of 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. Note that when the thermal expansion coefficient (%) at a temperature of 165°C is a negative value, this indicates that the laminated film has shrunk as a result of the 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 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 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] A laminated film and a package were produced in the same manner as in Example 1, except that the thickness of the printed layer was changed to 7 μm, and the package was evaluated. The results are shown in Table 1. The thermomechanical analysis curve is shown in Figure 4.

[0120] [Comparative Example 1] A laminated film and a package were produced in the same manner as in Example 1, except that a printed layer was not provided, and the package was evaluated. The results are shown in Table 1. The thermomechanical analysis curve is shown in Figure 4.

[0121]

[0122] As is clear from the above results, in the packages 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 package 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] The packages of Examples 1 to 3, which were provided with a printed layer and an anchor coat layer, had a high 1-second heat resistance temperature of 165°C to 172°C, a high 5% thermal expansion temperature of 167°C to 172°C, and a low thermal expansion coefficient of -10% to 1.5% at a temperature of 165°C, and thus excellent heat resistance. In particular, in Examples 1 to 3, there was a tendency for the 1-second heat resistance temperature to increase as the thickness of the printed layer increased.

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

[0125] As is clear from FIG. 4, the laminated films (lid materials) of Examples 1 to 3 had excellent heat resistance, with the softening temperature shifted to a higher temperature by 6 to 12°C due to the presence of the printing layer and anchor coat layer.

[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 was not shifted to the higher temperature side, and the heat resistance was poor.

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

[0128] DESCRIPTION OF SYMBOLS 1...Laminated film 1a...First surface of laminated film 11...Base material layer 12...Anchor coat layer 13...Printed layer 2...Molded film 2a...First surface of molded film 2b...Second surface of molded film 2c...Protruding portion of molded film 10...Package 10a...Storage portion of package 10b...Slit of package 100...Solid agent 200...Manufacturing apparatus 210...Molding portion 220...Storage portion 230...Adhesive portion

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, A laminate film for blister packs, wherein the content of the thermoplastic resin in the base material layer is 80 mass % or more relative to the total mass of the base material layer.

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 material layer facing the anchor coat layer has been 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.