Lid material and blister pack package

Abstract

This lid material 1 for a blister pack package comprises a substrate layer 12, code printing parts 140 provided on one surface 12a of the substrate layer 12, and a sealant layer 11 provided on the other surface 12b of the substrate layer 12, wherein: the substrate layer 12 contains an olefin-based polymer and / or a polyester, and is colored; the code printing parts 140 are formed by an ultraviolet printing method; and the one surface 12a of the substrate layer 12 is visible between the code printing parts 140 adjacent to each other.

Description

Lid Material and Blister Pack Package

[0001] The present invention relates to a lid material and a blister pack package. The present application claims priority based on Japanese Patent Application No. 2025-052870 filed in Japan on March 27, 2025, the content of which is incorporated herein by reference.

[0002] A blister pack package (also referred to as a press-through package (PTP)) is constituted by heat-sealing a bottom material provided with a recessed portion and a sheet-shaped lid material, wherein the inside of the recessed portion serves as a storage portion, and is used for packaging various articles including daily necessities. For example, in a blister pack package for packaging tablets, a molded product of a transparent resin film is used as the bottom material, and an aluminum sheet is usually used as the lid material.

[0003] In recent years, for packages manufactured using resin films, methods for reusing (recycling) such packages have been actively studied. For example, in the case of a multi-layer resin film, if the main constituent materials of the plurality of resin layers are of the same or similar type, there is no need to separate each resin layer for separate reuse, and the entire resin film can be easily reused. Accordingly, development of such multi-layer resin films has been actively promoted.

[0004] Furthermore, in the case of a blister pack package containing tablets as stored items, if the lid material is formed of a resin film containing, as a main constituent material, a resin of the same or similar type as the resin included in the bottom material instead of a conventional aluminum sheet, the lid material and the bottom material can be reused at the same time, so that the reusability of the blister pack package becomes extremely high. Examples of the resin constituting the bottom material and the lid material include olefin-based polymers.

[0005] Incidentally, in a blister pack package containing tablets as a stored item, it may be necessary to provide various codes such as barcodes and two-dimensional codes for managing the package on the surface of the lid material opposite to the storage portion side. In such cases, a code printing section is usually formed by a printing method. As a lid material for constituting such a blister pack package, Patent Document 1 discloses a lid material containing an olefin polymer and having a gloss value at a specific measurement angle of not more than a fixed value. According to Patent Document 1, a package using this lid material is said to be excellent in the readability of the code printing section.

[0006] Japanese Unexamined Patent Application Publication No. 2023-172391

[0007] In the future, higher definition of various codes is expected, and it is predicted that further improvement in the readability of the code printing section will be required for the lid material of blister pack packages.

[0008] An object of the present invention is to provide a novel lid member that uses a resin film for constituting a blister pack package, and has a code printing section excellent in readability provided on the surface thereof.

[0009] In order to solve the above problems, the present invention adopts the following configuration. [1] A lid material for a blister pack package, the lid material comprising a base material layer, a code printing section provided on one surface of the base material layer, and a sealant layer provided on the other surface of the base material layer, wherein the base material layer contains one or both of an olefin polymer and a polyester, is colored, the code printing section is formed by an ultraviolet printing method, and one surface of the base material layer is visible between the code printing sections adjacent to each other. [2] The lid material according to [1], wherein the base material layer is white. [3] The lid material according to [1] or [2], wherein the lid material is provided with a surrounding portion that continuously or intermittently surrounds the code printing section on one surface side of the base material layer, and the height of the surrounding portion is 50 to 160% of the height of the code printing section.

[0010] [4] The lid material further comprises an overcoat layer covering the code printing portion on one side of the base material layer, according to any one of the items [1] to [3]. [5] CIE1976L ＊ a ＊ b ＊ In the color space, the lightness L of one surface of the substrate layer ＊ However, the lid material is 80 to 99, as described in any one of items [1] to [4]. [6] CIE1976L ＊ a ＊ b ＊ In the color space, the brightness L of the code printing area. ＊ The lid material according to any one of [1] to [5], wherein the ratio is 0.01 to 45. [7] The lid material according to any one of [1] to [6], wherein the base layer comprises one or more selected from the group consisting of ethylene polymers, propylene polymers, and polyethylene terephthalate.

[0011] [8] The lid material according to any one of [1] to [7], wherein the base layer comprises a biomass-derived resin or a biodegradable resin as at least one of the following: the olefin polymer, the polyester, and another resin that does not fall under either the olefin polymer or the polyester. [9] The lid material according to any one of [1] to [8], wherein the lid material does not include a layer mainly composed of aluminum.

[0012]

[10] The lid material according to any one of claims [1] to [9], wherein at least a portion of one surface of the base material layer is exposed between adjacent code printing portions, and the ratio of the area of ​​the exposed portion of one surface of the base material layer to the area of ​​the portion of one surface of the base material layer not provided with the code printing portion is 60% or more. (Basis: paragraphs 0025 and 0028 of the specification)

[11] The lid material according to any one of claims [1] to

[10] , further comprising a colorless, transparent or translucent anchor coat layer between one surface of the base material layer and the code printing portion. (Basis: paragraphs 0040 and 0042 of the specification)

[12] The lid material according to any one of claims [1] to

[11] , wherein a structure other than the code printing portion exists between adjacent code printing portions, and the structure is colorless, transparent or translucent. (Basis: paragraph 0042 of the specification)

[13] The lid material according to [3], wherein the minimum distance between the enclosed portion and the code printing portion is 0 to 3 mm. (Basis: paragraph 0118 of the specification)

[0013]

[14] A blister pack packaging comprising a lid material and a bottom material as described in any one of [1] to

[13] , and a seal.

[15] The blister pack packaging according to

[14] , wherein the bottom material comprises the olefin polymer or a resin of the same type as polyester.

[0014] According to the present invention, a novel lid material is provided for a blister pack packaging body, which is made of a resin film and has a highly readable code printed area on its surface.

[0015] This is a schematic plan view showing an example of a lid material according to one embodiment of the present invention. This is an enlarged cross-sectional view of the lid material shown in Figure 1 along the line II-II. This is a schematic plan view showing another example of a lid material according to one embodiment of the present invention. This is an enlarged cross-sectional view showing yet another example of a lid material according to one embodiment of the present invention. This is a schematic perspective view showing an example of a blister pack packaging according to one embodiment of the present invention. This is a cross-sectional view of the blister pack packaging shown in Figure 5 along the line V-V.

[0016] <<Lid Material>> A lid material according to one embodiment of the present invention is for a blister pack packaging, and the lid material comprises a base layer, a code printing portion provided on one surface of the base layer, and a sealant layer provided on the other surface of the base layer, the base layer contains either or both of an olefin polymer and polyester and is colored, the code printing portion is formed by ultraviolet printing (sometimes referred to as "UV printing" in this specification), and one surface of the base layer is visible between adjacent code printing portions (sometimes referred to as "code printing gaps" in this specification).

[0017] Typically, unlike conventional aluminum sheets, it is difficult to manufacture lid materials primarily composed of resin at high temperatures to avoid quality degradation. Therefore, for example, when forming a code print on a resin film that constitutes a lid material, printing methods that require high-temperature drying of the ink cannot be applied. In contrast, in the lid material of this embodiment, the base layer contains either an olefin polymer or polyester, or both, and although it contains resin, the code print is formed using ultraviolet printing (UV printing), which does not require high-temperature processing. As a result, even though the lid material has a code print, quality degradation is suppressed.

[0018] In this embodiment, the lid material has a colored base layer, and furthermore, in the space between adjacent code-printed sections (the code-printed gap), one side of the base layer (the side on which the code-printed section is provided) is visible, resulting in excellent readability of the code-printed section.

[0019] In the code-printed void in the lid material of this embodiment, the statement that one surface of the base material layer is visible means, in other words, that the color of the one surface of the base material layer can be identified by visual inspection. More specifically, in the code-printed void, either the one surface of the base material layer is exposed, or the one surface of the base material layer is not exposed, but there is some structure other than the code-printed area (for example, the anchor coat layer described later) covering the one surface of the base material layer, but the structure is colorless, transparent or translucent, and the one surface of the base material layer is visible through the structure. The statement that one surface of the base material layer is exposed means that the structure is not present.

[0020] The lid material of this embodiment contains either an olefin polymer or polyester, or both, in its base layer. By combining it with a bottom material containing the same type of resin, a blister pack packaging with high reusability can be constructed.

[0021] The present invention will be described below with reference to the drawings. For convenience, the drawings used in the following description may show enlarged versions of key parts to make the features of the present invention easier to understand, and the dimensional ratios of each component may not be the same as in reality.

[0022] Figure 1 is a schematic plan view showing an example of the lid material of this embodiment, and Figure 2 is an enlarged cross-sectional view of the lid material shown in Figure 1 along line II-II. In Figures 2 and beyond, the same components as those shown in the previously described figures are denoted by the same reference numerals as in those previously described figures, and their detailed descriptions are omitted.

[0023] The lid material 1 shown herein is for a blister pack package, and comprises a base material layer 12, a code printing part 140 provided on one surface of the base material layer 12 (which may be referred to as a "first surface" in the present specification) 12a, and a sealant layer 11 provided on the other surface of the base material layer 12 (the surface opposite to the code printing part 140 side, which may be referred to as a "second surface" in the present specification) 12b. The surface of the sealant layer 11 opposite to the base material layer 12 side (which may be referred to as a "second surface" in the present specification) 11b is an exposed surface, and serves as a sealing surface with a bottom material in a blister pack package. The lid material 1 further comprises a surrounding part 13 continuously surrounding the code printing part 140 on the one surface 12a side of the base material layer 12. Here, the surrounding part 13 is provided on the first surface 12a of the base material layer 12 similarly to the code printing part 140. The distance between the surrounding part 13 and the code printing part 140 is L １ .

[0024] The base material layer 12 contains either one or both of an olefin-based polymer and a polyester. The base material layer 12 is colored.

[0025] The code printing part 140 is formed by a UV printing method, and a code 14 for managing a blister pack package (the lid material 1) is formed by all of the plurality of code printing parts 140. Between mutually adjacent code printing parts 140, nothing is provided on the first surface 12a of the base material layer 12, and the entire region of the first surface 12a of the base material layer 12 is exposed. Since the colored base material layer 12 (the first surface 12a of the base material layer 12) is exposed in the code printing gap as described above, the readability of the code printing part of the lid material is improved.

[0026] The height H of the surrounding part 13 １３ is the height H of the code printing part 140 １４０ of 50 to 160% (50 ≦ H １３ / H １４０ × 100 ≦ 160), and it is preferably 80 to 120% of the height H of the code printing part 140 １４０ (80 ≦ H １３ / H １４０It is more preferable that × 100 ≤ 120.

[0027] The lid material 1 has multiple areas (code printing gaps) corresponding to the spaces between adjacent code printing sections 140, and in all of these areas (code printing gaps), the entire area of ​​the first surface 12a of the base material layer 12 is exposed. However, in the lid material of this embodiment, the state of the code printing gaps is not limited to this. In the lid material of this embodiment, it is sufficient that at least a portion of the first surface of the base material layer is exposed in all of the code printing gaps.

[0028] In this specification, "the first surface of the base layer is exposed in the code printing void" means that there is a region in the code printing void where there are no structures other than the code printing. For example, in a cross-section in the thickness direction of the lid material (in other words, the height direction of the code printing), as shown in Figure 2, the width of the code printing may widen as the code printing approaches the base layer, that is, it may flare outwards. In this embodiment, it is sufficient that there is a region between the flared portions of adjacent code printing sections where there are no structures other than the code printing.

[0029] Another method to improve the readability of the code printing area is to provide an auxiliary printing area of ​​a different color in the code printing gap. A lid material with an auxiliary printing area can be manufactured, for example, by forming the code printing area first and then the auxiliary printing area on the first surface of the base layer, or by forming the auxiliary printing area first and then the code printing area, or by forming the code printing area and the auxiliary printing area simultaneously. The auxiliary printing area can be formed, for example, by UV printing, similar to the code printing area. However, in this case, in addition to forming the code printing area, it is necessary to form the auxiliary printing area in close proximity to the code printing area, which complicates the manufacturing process of the lid material and requires extra effort and time. Furthermore, if the auxiliary printing area overlaps the code printing area, or if the code printing area overlaps the auxiliary printing area, the readability of the code printing area will decrease. The effect of the auxiliary printing area is maximized when it is provided in all code printing gaps, but since forming the auxiliary printing area is difficult, it is not practical to provide it in all code printing gaps.

[0030] In the code-printed void of the lid material of this embodiment, the ratio of the area of ​​the first surface of the base material layer exposed to the area of ​​the area of ​​the first surface of the base material layer not provided with a code print is preferably 60% or more, and more preferably 80% or more. The higher the ratio, the better the readability of the code print. On the other hand, the ratio is 100% or less.

[0031] The lid material of this embodiment is not limited to the lid material 1 shown in Figures 1 and 2, and some components of the lid material 1 may be changed, deleted, or added without departing from the spirit of the present invention.

[0032] For example, in the lid material 1 shown in Figure 1, the enclosure portion 13 continuously surrounds the code printing portion 140. However, in the lid material of this embodiment, one or more gaps of arbitrary size and shape are provided in the enclosure portion 13, connecting any region of the inner circumferential surface on the side of the enclosure portion 13 facing the code printing portion 140 with any region of the outer circumferential surface on the opposite side of the enclosure portion 140, along the entire height of the enclosure portion 13, so that the enclosure portion 13 intermittently (discontinuously) surrounds the code printing portion 140.

[0033] Figure 3 is a schematic plan view showing another example of the lid material of this embodiment. The lid material 2 shown here has an enclosure portion 23 on the first surface 12a side of the base layer 12 that intermittently (discontinuously) surrounds the code printing portion 140 (code 14). More specifically, the enclosure portion 23 has four elongated gap portions in a plan view that connect a specific area on the inner circumferential surface 23c on the side of the code printing portion (code 14) and a specific area on the outer circumferential surface 23d opposite to the side of the code printing portion (code 14) along the entire height of the enclosure portion 23. Each of these gap portions is provided by connecting, in the shortest possible distance, an area on the inner circumferential surface 23c of the enclosure portion 23 that would normally be a bend and an area on the outer circumferential surface 23d of the enclosure portion 23 that would normally be a corner. As a result, the enclosure portion 23 is divided into four areas: the first enclosure portion 231, the second enclosure portion 232, the third enclosure portion 233, and the fourth enclosure portion 234. In this way, the discontinuously provided enclosure portion 23 also provides the same advantageous effects as the continuously provided enclosure portion 13, which will be described later. The lid material 2 is the same as the lid material 1 shown in Figure 1, except that the enclosure portion 23 has gaps provided in this way.

[0034] In this embodiment, the configuration of the enclosure portion that intermittently (discontinuously) surrounds the code printing portion is not limited to that shown in Figure 3. For example, the void portion may be provided connecting an arbitrary area on the inner circumferential surface of the enclosure portion with an area on the outer circumferential surface of the enclosure portion that is not a corner portion, or it may be provided connecting an area on the inner circumferential surface of the enclosure portion that is not a bent portion with an arbitrary area on the outer circumferential surface of the enclosure portion. For example, the void portion may be provided in one to three locations in the enclosure portion, or in five or more locations. For example, the shape of the void portion may be a shape other than an elongated shape in plan view.

[0035] In the lid material of this embodiment, the configuration other than the enclosed portion can also be adjusted as appropriate according to the purpose. For example, the lid material 1 shown in Figure 1 has one code 14, but the number of codes on a single lid material of this embodiment may be two or more, and the number of codes can be adjusted as appropriate considering the use of the blister pack packaging, the type of contents to be stored, etc.

[0036] For example, the lid material of this embodiment may or may not include any other layer that does not correspond to the base layer, the code printing section, or the sealant layer.

[0037] An example of the aforementioned other layer is an overcoat layer covering the code printing area on one side (first side) of the base layer. That is, the lid material of this embodiment may further include an overcoat layer covering the code printing area on one side (first side) of the base layer.

[0038] Figure 4 is a schematic enlarged cross-sectional view showing an example of such a lid material. The lid material 3 shown here further includes an overcoat layer 15 covering the code printing portion 140 on the first surface 12a side of the base material layer 12. More specifically, the lid material 3 is provided in contact with the end of the code printing portion 140 opposite to the base material layer 12 side, and also includes an overcoat layer 15 provided on the surface 13a of the enclosure portion 13 opposite to the base material layer 12 side (sometimes referred to as the "first surface" in this specification).

[0039] In the lid material 3, the overcoat layer 15 may be provided over the entire surface 13a of the surrounding portion 13 opposite to the base material layer 12, or it may be provided only in a part of the area.

[0040] In this embodiment, the overcoat layer 15 is also provided on the surface 13a of the enclosed portion 13 opposite to the base material layer 12. However, in the lid material of this embodiment, the overcoat layer only needs to cover the code printing portion and does not need to be provided on the surface (first surface) opposite to the base material layer of the enclosed portion.

[0041] Here, the overcoat layer 15 is provided in contact with the first surface 12a of the base material layer 12, the inner circumferential surface of the enclosure 13, and the side surface of the code printing section 140. However, it is not necessary for the overcoat layer 15 to be in contact with any or all of the first surface 12a of the base material layer 12, the inner circumferential surface of the enclosure 13, and the side surface of the code printing section 140. It is sufficient for the overcoat layer 15 to be in contact with the end of the code printing section 140 that is opposite to the side of the base material layer 12.

[0042] Another example of the aforementioned other layers is an anchor coat layer provided between one surface (first surface) of the base layer and the code printing area. That is, the lid material of this embodiment may further include an anchor coat layer between one surface (first surface) of the base layer and the code printing area (in the lid material 1 shown in Figure 2, between one surface 12a of the base layer 12 and the code printing area 140).

[0043] The anchor coat layer may be provided between the first surface of the base material layer and the code printing portion, and may, for example, be provided over the entire surface of the first surface of the base material layer, or only in a part of it.

[0044] However, the anchor coat layer must be colorless, transparent, or translucent. In the lid material of this embodiment, not only the anchor coat layer, but also any structure provided between the first surface of the base material layer and the code printing section must be colorless, transparent, or translucent. Thus, in the lid material of this embodiment, between adjacent code printing sections (the code printing gap), the first surface of the base material layer is exposed, or even if a structure other than the code printing section is present, the structure is colorless, transparent, or translucent, and the first surface of the base material layer is visible through the structure. In the code printing gap of the lid material where the structure is provided, for the same reasons as when the first surface of the base material layer is exposed as described above, the ratio of the area where the first surface of the base material layer is visible to the area where the code printing section is not provided on the first surface of the base material layer is preferably 60% or more, more preferably 80% or more, while the ratio is 100% or less.

[0045] Next, each layer constituting the lid material of this embodiment will be described in more detail.

[0046] <Base Layer> The base layer is the main layer of the lid material in this embodiment, and enables the lid material to maintain its structure stably. The base layer is a resin layer containing either an olefin polymer or polyester, or both.

[0047] The base layer is colored in a different color from the code printing area, enabling high readability of the code printing area on the lid material. The base layer only needs to have at least one surface (the first surface) colored; however, the entire layer, including the interior, may be colored. The base layer is preferably white in order to particularly enhance the readability of the code printing area on the lid material.

[0048] In terms of improving the readability of the code printed on the lid material, CIE1976L ＊ a ＊ b ＊ The lightness L of one surface (first surface) of the substrate layer in the color space. ＊However, it is preferably 80 to 99, more preferably 85 to 99, and even more preferably 90 to 99. Brightness L of one surface of the base layer ＊ If the above numerical range is used, the overall brightness L of the substrate layer, including not only one surface but also its interior, is considered to be within the same range. ＊ The values ​​may be within the above range.

[0049] Not limited to the aforementioned one surface of the substrate layer, the color and brightness L of the substrate layer ＊ All of these can be easily adjusted by adjusting the type and amount of components contained in the base layer. In particular, by making the base layer contain the pigments described later and adjusting their type and amount, the color and lightness L of the base layer can be adjusted. ＊ It can be adjusted more easily.

[0050] The base layer may contain only one or both of an olefin polymer and / or polyester, or it may contain two or more types. If it contains two or more types, the combination and ratio thereof can be arbitrarily selected according to the purpose.

[0051] The base layer may or may not contain other components that are neither olefin polymers nor polyesters. The other components contained in the base layer may be one type or two or more types, and if there are two or more types, their combination and ratio can be arbitrarily selected according to the purpose.

[0052] In the base layer, the ratio of the total content of all components of the base layer (olefin polymer, polyester, and the other components) to the total mass of the base layer does not exceed 100% by mass. Similarly, in the resin composition for forming the base layer, which will be described later, the ratio of the total content of all components of the resin composition to the total mass of the resin composition does not exceed 100% by mass.

[0053] The olefin polymer contained in the base layer is a polymer (resin component) having structural units derived from an olefin, and may be a homopolymer of one olefin (alkene), or an olefin copolymer having structural units derived from two or more monomers (provided that at least one of them is an olefin). Preferred olefin polymers include, for example, ethylene polymers and propylene polymers.

[0054] The ethylene-based polymer contained in the base layer is a polymer (resin component) having structural units derived from ethylene, and may be polyethylene (PE, for example, a homopolymer of ethylene), or it may be an ethylene-based copolymer having structural units derived from ethylene and structural units derived from monomers other than ethylene. However, among olefin-based polymers having structural units derived from ethylene and structural units derived from propylene, copolymers in which the number of structural units derived from propylene is greater than the number of structural units derived from ethylene are classified as propylene-based copolymers.

[0055] Among the ethylene-based polymers contained in the base layer, examples of polyethylene (PE) include low-density polyethylene (LDPE), linear low-density polyethylene (LLDPE), metallocene-catalyzed linear low-density polyethylene (mLLDPE), medium-density polyethylene (MDPE), and high-density polyethylene (HDPE).

[0056] In this specification, the densities of low-density polyethylene (LDPE), linear low-density polyethylene (LLDPE), and metallocene-catalyzed linear low-density polyethylene (mLLDPE) are defined as 0.910 g / cm³. ３ Above, 0.945g / cm ３ It is less than 0.945 g / cm³. The density of medium-density polyethylene (MDPE) is 0.945 g / cm³. ３ Above, 0.955g / cm ３ It is less than 0.955 g / cm³. The density of high-density polyethylene (HDPE) is 0.955 g / cm³. ３ That's all.

[0057] The ethylene polymer contained in the base layer is preferably polyethylene.

[0058] The propylene polymer contained in the substrate layer is a polymer (resin component) having structural units derived from propylene, and may be a propylene homopolymer (homopolypropylene, hPP), or a propylene copolymer having structural units derived from propylene and structural units derived from monomers other than propylene.

[0059] Examples of the propylene copolymer contained in the substrate layer include propylene-ethylene random copolymer (also known as polypropylene random copolymer (rPP)) and propylene-ethylene block copolymer (also known as polypropylene block copolymer (bPP)).

[0060] In this specification, the term "polypropylene" encompasses homopolypropylene (hPP), propylene-ethylene random copolymer (rPP), and propylene-ethylene block copolymer (bPP).

[0061] The melt flow rate (MFR) of the propylene polymer contained in the base layer (in this specification, not limited to propylene polymers, this may be referred to as "MFR") is preferably 0.5 to 15 g / 10 min, and may be, for example, 0.5 to 6 g / 10 min, 4 to 11 g / 10 min, or 9 to 15 g / 10 min. Having the MFR of the propylene polymer within this range facilitates the multilayering of the lid material.

[0062] In this specification, MFR refers to the value measured in accordance with JIS K 7210-1:2014, not limited to propylene polymers. For propylene polymers, the MFR is preferably the value obtained when the test temperature is 230°C.

[0063] For the same reasons as in the case of MFR described above, the melting point of the propylene polymer contained in the substrate layer is preferably 155 to 162°C.

[0064] The propylene polymer contained in the base layer is preferably homopolypropylene, and more preferably homopolypropylene in which either the MFR or the melting point, or both, are within the above numerical range.

[0065] The olefin polymer contained in the substrate layer is preferably a propylene polymer.

[0066] The polyester contained in the base layer may be publicly known. Examples of the polyester include polyethylene terephthalate (PET), polybutylene terephthalate (PBT), polytrimethylene terephthalate (PTT), polyethylene naphthalate (PEN), polybutylene naphthalate (PBN), polybutylene succinate (PBS), polybutylene succinate adipate (PBSA), polybutylene adipate terephthalate (PBAT), polyethylene terephthalate succinate (PETS), poly(3-hydroxybutyrate-co-3-hydroxyhexanoate) (PHBH), and polyglycolic acid (PGA). Among these, polyethylene terephthalate is preferred as the polyester contained in the base layer because it allows for easier production of lid materials with good properties.

[0067] In terms of making it easier to manufacture lid materials with good properties, it is preferable that the base layer contains one or more resin components selected from the group consisting of ethylene polymers, propylene polymers, and polyethylene terephthalate.

[0068] When the base layer contains a propylene polymer as an olefin polymer, the ratio of the propylene polymer content to the total content of the olefin polymer and polyester in the base layer ([Content of propylene polymer in the base layer (parts by mass)] / ([Content of olefin polymer in the base layer (parts by mass)] + [Content of polyester in the base layer (parts by mass)] × 100) is preferably 80% by mass or more, and may be, for example, 85% by mass or more, 90% by mass or more, 95% by mass or more, and 98% by mass or more. On the other hand, the above ratio is 100% by mass or less.

[0069] The other components contained in the base layer may be either resin components or non-resin components.

[0070] Of the other components mentioned above, the resin component is not particularly limited as long as it does not fall under either an olefin polymer or a polyester.

[0071] Among the other components mentioned above, the non-resin component may include, for example, additives known in the art. Examples of such additives include antifogging agents, antiblocking agents, antioxidants, antistatic agents, nucleating agents, inorganic particles, viscosity reducers, viscosity thickeners, heat stabilizers, lubricants, infrared absorbers, ultraviolet absorbers, and colorants (e.g., dyes, pigments, etc.).

[0072] The base layer is colored, and from this point of view, it is preferable that the base layer contains a pigment as one of the other components. Preferred pigments include, for example, white pigments such as titanium dioxide (more specifically, titanium dioxide such as rutile-type titanium dioxide and anatase-type titanium dioxide), zinc oxide, zirconium oxide, magnesium oxide, calcium oxide, tin oxide, barium oxide, magnesium carbonate, calcium carbonate (more specifically, light calcium carbonate, heavy calcium carbonate, etc.), barium carbonate, zinc carbonate, aluminum hydroxide, calcium hydroxide, magnesium hydroxide, zinc hydroxide, barium sulfate, calcium sulfate, zinc oxide, zinc sulfide, mica, and lithopone.

[0073] In the base layer, the ratio of the total content of olefin polymer, polyester, and pigment to the total mass of the base layer (([Content of olefin polymer in the base layer (parts by mass)] + [Content of polyester in the base layer (parts by mass)] + [Content of pigment in the base layer (parts by mass)]) / [Total mass of the base layer (parts by mass)] × 100) is preferably 80% by mass or more, and may be, for example, 85% by mass or more, 90% by mass or more, 95% by mass or more, and 98% by mass or more. The effect obtained by using these components is enhanced when the ratio is above the lower limit. On the other hand, the ratio is 100% by mass or less. Here, for example, if the base layer does not contain olefin polymer, the content of olefin polymer in the base layer is 0 parts by mass. The same applies to polyester and pigment. The aforementioned ratio is typically the same as the ratio of the total content of olefin polymers, polyesters, and pigments to the total content (parts by mass) of components that do not vaporize at room temperature in the resin composition described later (([Content of olefin polymers in the resin composition (parts by mass)] + [Content of polyesters in the resin composition (parts by mass)] + [Content of pigments in the resin composition (parts by mass)]) / [Total content of components that do not vaporize at room temperature in the resin composition (parts by mass)] × 100). The relationship between the content of components in any of the layers constituting the lid material and the content of components in the resin composition for forming this layer is the same for layers other than the base layer, as described later.

[0074] In this specification, "room temperature" means a temperature that is neither cooled nor heated, i.e., an ordinary temperature, such as 15 to 25°C.

[0075] When the base layer contains a pigment, the ratio of the pigment content to the total content of the olefin polymer and polyester in the base layer ([Pigment content in the base layer (parts by mass)] / ([Olefin polymer content in the base layer (parts by mass)] + [Polyester content in the base layer (parts by mass)]) × 100) is preferably 3% by mass or more, for example, it may be 4% by mass or more, or 5% by mass or more. When the ratio is above the lower limit, the degree of coloring of the base layer becomes higher. On the other hand, in terms of suppressing the excessive use of pigment, the ratio is preferably 10% by mass or less.

[0076] When the base layer, the layers in the lid material other than the base layer, and the bottom material described later all contain the same type of resin, the ratio of the content of the same type of resin to the total mass of the base layer is preferably 60% by mass or more, and may be, for example, 70% by mass or more, 80% by mass or more, 90% by mass or more, or 95% by mass or more. The higher the ratio, the easier it is to monomaterialize the lid material and the blister pack packaging described later. On the other hand, the ratio is 100% by mass or less.

[0077] In this embodiment, "the same type of resin" means that when comparing resins having common structural units, the ratio of the amount (moles) of common structural units to the total amount (moles) of structural units in both resins is 20 mol% or more. For example, among propylene-based copolymers such as propylene-ethylene random copolymer (rPP) and propylene-ethylene block copolymer (bPP), those in which the ratio of the amount (moles) of structural units derived from propylene to the total amount (moles) of structural units is 20 mol% or more are the same type as homopolypropylene (hPP). For example, low-density polyethylene (LDPE), linear low-density polyethylene (LLDPE), metallocene-catalyzed linear low-density polyethylene (mLLDPE), medium-density polyethylene (MDPE), high-density polyethylene (HDPE), ethylene-methyl acrylate copolymer (EMA resin), ethylene-methyl methacrylate copolymer (EMMA resin), ethylene-vinyl alcohol copolymer (EVOH, EVA saponified), ethylene-vinyl acetate copolymer (EVA), ethylene-vinyl alcohol-vinyl acetate copolymer (EVA partially saponified), etc., are all of the same type because the ratio of the amount (moles) of constituent units derived from ethylene to the total amount (moles) of constituent units is 20 mol% or more. In this embodiment, for any of these resins of the same type, the ratio of the amount (moles) of common constituent units to the total amount (moles) of constituent units is preferably 30 mol% or more, more preferably 40 mol% or more, and even more preferably 50 mol% or more, for example, it may be 60 mol% or more, 70 mol% or more, or 80 mol% or more. On the other hand, the aforementioned ratio is less than 100 mol%.

[0078] The base layer preferably contains a biomass-derived resin (also known as biomass plastic) or a biodegradable resin as at least a portion of its resin components. More specifically, the base layer preferably contains a biomass-derived resin or a biodegradable resin as at least one of the following: the olefin polymer, the polyester, and another resin that does not fall under either the olefin polymer or the polyester (i.e., the other component which is a resin component). A lid material having such a base layer is preferable in that it has a low environmental impact. The biodegradable resin may be either a biomass-derived resin or a fossil fuel-derived resin.

[0079] Examples of biomass-derived resins include polyethylene (PE), polyethylene terephthalate (PET), polytrimethylene terephthalate (PTT), and polyamide (PA).

[0080] Examples of the aforementioned biodegradable resins include polyesters such as polybutylene succinate (PBS), polybutylene succinate adipate (PBSA), polybutylene adipate terephthalate (PBAT), polyethylene terephthalate succinate (PETS), poly(3-hydroxybutyrate-co-3-hydroxyhexanoate) (PHBH), and polyglycolic acid (PGA).

[0081] When the base layer contains a biomass-derived resin, the ratio of the biomass-derived resin content to the total resin content (total content of olefin polymers, polyesters, and other resins not belonging to either olefin polymers or polyesters; the same applies hereinafter) is preferably 10 to 100% by mass, for example, 30 to 100% by mass, 50 to 100% by mass, and 70 to 100% by mass, or 10 to 80% by mass, 10 to 60% by mass, and 10 to 40% by mass, or 30 to 80% by mass.

[0082] When the base layer contains a biodegradable resin, the ratio of the biodegradable resin content to the total resin content is preferably 10 to 100% by mass, for example, 30 to 100% by mass, 50 to 100% by mass, and 70 to 100% by mass, or 10 to 80% by mass, 10 to 60% by mass, and 10 to 40% by mass, or 30 to 80% by mass.

[0083] The base layer may consist of one layer (single layer) or of two or more layers. When the base layer consists of multiple layers, these layers may be identical or different, and the combination of these layers is not particularly limited as long as it does not impair the effects of the present invention. An example of a base layer consisting of multiple layers is a three-layer base layer comprising a colored base layer and uncolored, transparent base layers provided on both sides thereof. However, the base layer consisting of multiple layers is not limited to this.

[0084] In this specification, not only in the case of a base layer, "multiple layers may be identical or different from one another" means "all layers may be identical, all layers may be different, or only some layers may be identical." Furthermore, "multiple layers are different from one another" means "at least one of the constituent materials and thickness of each layer is different from the other."

[0085] The thickness of the base layer is not particularly limited, but is preferably 20 to 95 μm, more preferably 25 to 90 μm, and even more preferably 30 to 85 μm. A base layer thickness greater than or equal to the lower limit provides greater stability to the base layer structure. A base layer thickness less than or equal to the upper limit avoids excessive thickness, allowing for a thinner lid material. Here, "base layer thickness" refers to the total thickness of the base layer; for example, the thickness of a base layer consisting of multiple layers refers to the total thickness of all layers constituting the base layer. This also applies to layers other than the base layer, as will be discussed later.

[0086] <Sealant Layer> The sealant layer enables heat sealing of the lid material to other resin films or molded bodies thereof (e.g., bottom material). The sealant layer is preferably a resin layer containing resin.

[0087] The sealant layer may or may not contain other components besides the resin.

[0088] The resin contained in the sealant layer and the other components may each consist of only one type or two or more types. If there are two or more types, their combination and ratio can be arbitrarily selected according to the purpose.

[0089] In the sealant layer, the ratio of the total content of all components of the sealant layer (resin and the other components) to the total mass of the sealant layer does not exceed 100% by mass. Similarly, in the resin composition for forming the sealant layer, as described later, the ratio of the total content of all components of the resin composition to the total mass of the resin composition does not exceed 100% by mass.

[0090] The sealant layer preferably contains an α-olefin elastomer and an ethylene-vinyl acetate copolymer (EVA) as the resin. The seal strength between the lid material with such a sealant layer and the object to be sealed (e.g., the bottom material) will be higher.

[0091] The α-olefin elastomer (α-olefin thermoplastic elastomer) contained in the sealant layer is not particularly limited as long as it is a resin in which an α-olefin polymer such as polypropylene (PP) or polyethylene (PE) is used as the hard segment and a rubber component such as ethylene propylene thermopolymer (ethylene propylene terpolymer, EPM) or ethylene propylene rubber (EPDM) is used as the soft segment. In this specification, an α-olefin elastomer with polypropylene as the hard segment may be referred to as a "propylene elastomer," and an α-olefin elastomer with polyethylene as the hard segment may be referred to as an "ethylene elastomer."

[0092] The melt flow rate (MFR) of the α-olefin elastomer contained in the sealant layer is preferably 0.2 to 15 g / 10 min, more preferably 1 to 8 g / 10 min, and even more preferably 2 to 6 g / 10 min. Having the MFR of the α-olefin elastomer within this range results in higher sealing strength for the lid and bottom materials. The MFR of the α-olefin elastomer is preferably the value obtained when the test temperature is 190°C.

[0093] For the same reasons as in the case of MFR described above, the melting point of the α-olefin elastomer contained in the sealant layer is preferably 60 to 100°C.

[0094] The melt flow rate (MFR) of the ethylene-vinyl acetate copolymer contained in the sealant layer is preferably 0.2 to 20 g / 10 min, and may be, for example, 0.2 to 15 g / 10 min, 0.2 to 10 g / 10 min, or 0.2 to 5 g / 10 min. Having the MFR of the ethylene-vinyl acetate copolymer within this range results in higher sealing strength of the lid and bottom materials. The MFR of the ethylene-vinyl acetate copolymer is preferably the value obtained when the test temperature is 190°C.

[0095] The melting point of the ethylene-vinyl acetate copolymer contained in the sealant layer is preferably 47 to 96°C, and may be any of, for example, 58 to 96°C, 70 to 96°C, or 82 to 96°C. Having the melting point of the ethylene-vinyl acetate copolymer within this range results in higher sealing strength of the lid and bottom materials.

[0096] In the ethylene-vinyl acetate copolymer contained in the sealant layer, the ratio of the amount of constituent units derived from vinyl acetate (parts by mass) to the total amount (parts by mass) of constituent units in the ethylene-vinyl acetate copolymer (sometimes referred to as "vinyl acetate content" in this specification) is preferably 10 to 30% by mass, and more preferably 12 to 25% by mass. Having a vinyl acetate content within this range enhances the effects obtained by using the ethylene-vinyl acetate copolymer.

[0097] In the sealant layer, the total content ratio of α-olefin elastomer and ethylene-vinyl acetate copolymer relative to the total mass of the sealant layer is preferably 80% by mass or more, for example, 85% by mass or more, 90% by mass or more, 95% by mass or more, and 98% by mass or more. The effect obtained by using these components is enhanced when the ratio is above the lower limit. On the other hand, the ratio is 100% by mass or less.

[0098] In the sealant layer, the mass ratio of [content of α-olefin elastomer (parts by mass)] / [content of ethylene-vinyl acetate copolymer (parts by mass)] is preferably 95 / 5 to 40 / 60, for example, it may be any of 90 / 10 to 40 / 60 and 85 / 15 to 40 / 60, or any of 95 / 5 to 45 / 55 and 95 / 5 to 55 / 45, or any of 90 / 10 to 45 / 55 and 85 / 15 to 55 / 45. Having the mass ratio within this range increases the sealing strength of the lid and bottom materials.

[0099] When the sealant layer contains a propylene elastomer as an α-olefin elastomer, the ratio of the propylene elastomer content to the α-olefin elastomer content in the sealant layer is preferably 80% by mass or more, for example, 85% by mass or more, 90% by mass or more, 95% by mass or more, and 98% by mass or more. On the other hand, the ratio is 100% by mass or less.

[0100] When the sealant layer, the layers in the lid material other than the sealant layer, and the bottom material described later all contain the same type of resin, the ratio of the content of the same type of resin to the total mass of the sealant layer is preferably 60% by mass or more, and may be, for example, 70% by mass or more, 80% by mass or more, 90% by mass or more, or 95% by mass or more. The higher the ratio, the easier it is to monomaterialize the lid material and the blister pack packaging described later. On the other hand, the ratio is 100% by mass or less.

[0101] The other components contained in the sealant layer are non-resin components, and examples of such non-resin components include those similar to the other non-resin components contained in the substrate layer described above.

[0102] The sealant layer may consist of one layer (single layer) or of two or more layers. When the sealant layer consists of multiple layers, these layers may be identical or different, and the combination of these layers is not particularly limited as long as it does not impair the effects of the present invention. However, usually, a single layer of sealant is sufficient.

[0103] The thickness of the sealant layer is not particularly limited, but is preferably 2.5 to 21 μm, more preferably 3 to 20 μm, and even more preferably 3.5 to 19 μm. When the thickness of the sealant layer is above the lower limit, the structure of the sealant layer becomes more stable, and the sealing strength of the lid material and bottom material becomes higher. When the thickness of the sealant layer is below the upper limit, the thickness of the sealant layer is avoided, and the lid material can be made thinner.

[0104] <Code Printing Section> The code printing section (code printing layer) is formed by a UV printing method and is a UV-cured product of a UV-curable printing section forming composition. That is, the code printing section preferably contains a UV-cured product of a UV-curable component and a UV-cured product of a UV-curable resin. As the printing section forming composition, for example, a known UV-curable ink can be used.

[0105] The shape of each code printing section can be adjusted as appropriate according to the type of code formed by all the code printing sections. A code is a system of symbols or codes for representing information, and specific examples include barcodes and two-dimensional barcodes. In this specification, for example, a code printing section that forms a barcode may be referred to as a barcode printing section.

[0106] The code printing area is preferably colored, and more preferably colored in a different color from the base layer. The readability of such a code printing area is higher. The code printing area only needs to have at least its readable portion colored, and the entire area, including the interior, may be colored. In terms of particularly high readability of the code printing area on the lid material, the code printing area is preferably black.

[0107] In terms of improving the readability of the code printed on the lid material, CIE1976L ＊ a ＊ b ＊ In the color space, the brightness L of the code printing area. ＊ However, it is preferably 0.01 to 45, more preferably 0.01 to 40, and even more preferably 0.01 to 35. Brightness L of the code printing area ＊ If the value is within the above range, the overall brightness L will be calculated not only for the readable area of ​​the code print, but also for the interior of the code. ＊ The values ​​may be within the above range.

[0108] Color and brightness of the code printing area L ＊ All of these can be easily adjusted by adjusting the type and amount of components contained in the code printing area. In particular, by making the code printing area contain pigment and adjusting its type and amount, the color and brightness L of the code printing area can be adjusted. ＊ It can be adjusted more easily.

[0109] Height of the code printing area (for example, in the lid material 1 shown in Figure 2, the height of the code printing area 140 H) １４０ The code printing layer thickness (also referred to as the code printing layer thickness) is not particularly limited, but is preferably 1 to 10 μm, more preferably 2 to 9 μm, and even more preferably 3 to 8 μm. When the height of the code printing area is above the lower limit, the readability of the code printing area is improved. When the height of the code printing area is below the upper limit, the structure of the code printing area is more stable.

[0110] <Enclosed portion> The enclosed portion is a part that is visible between adjacent code printing portions (the code printing gaps) and is higher in height than one surface (first surface) of the base material layer. The enclosed portion suppresses defects that may occur in the lid material due to the presence of code printing portions in the lid material. The enclosed portion can be any configuration in the lid material of this embodiment.

[0111] If the lid material does not have a surrounding section, the code printing section protrudes from the first surface of the base material layer. This can lead to the code printing section being easily brought into contact with other objects, for example, during the manufacturing or use of the lid material or blister pack packaging, potentially causing damage such as abrasion or chipping. In contrast, if the lid material has a surrounding section, the surrounding section eliminates or reduces the degree to which the code printing section protrudes from the first surface of the base material layer, making it less likely for the code printing section to come into contact with other objects, thereby suppressing damage to the code printing section.

[0112] If the lid material does not have a surrounding section, the code-printed section protrudes from the first surface of the base material layer. As a result, when the lid material is laminated in its thickness direction, for example, by winding a long piece of lid material into a roll or stacking multiple pieces of lid material, the resulting laminate (roll, stacked body, etc.) will have the code-printed section and its surrounding area raised higher than other areas. This raised area becomes more pronounced as the degree of lamination increases. Such a laminate is inferior in terms of handling and appearance. In contrast, if the lid material has a surrounding section, the surrounding section eliminates or reduces the degree to which the code-printed section protrudes from the first surface of the base material layer, thereby suppressing these problems.

[0113] The enclosed portion only needs to be at a height greater than the height of one surface (first surface) of the base material layer on the lid material. For example, the base material layer may have a convex region corresponding to such an enclosed portion, and the enclosed portion may be part of the base material layer, or the enclosed portion may be provided separately from the base material layer on the first surface of the base material layer. It is preferable that the enclosed portion be provided separately from the base material layer on the first surface of the base material layer, as this makes it easier to form the enclosed portion. The enclosed portion 13 in the lid material 1 shown in Figure 2 is an example of one provided separately from the base material layer in this manner.

[0114] A base layer in which the enclosed portion is part of the base layer can be manufactured using a known method for manufacturing a resin layer having a convex region (or concave region).

[0115] An example of an enclosed area provided on the first surface of the base material layer, separate from the base material layer, is one formed by UV printing. With UV printing, the enclosed area can be easily formed in a simplified process, and furthermore, the deterioration of the quality of the lid material is suppressed, similar to when forming the code printing area.

[0116] The composition (constituent materials) of the enclosed area can be appropriately selected depending on, for example, the method of forming the enclosed area. For example, as described above, if the enclosed area is part of the substrate layer, the composition of the enclosed area is the same as the composition of the substrate layer. For example, as described above, if the enclosed area is provided separately from the substrate layer on the first surface of the substrate layer by UV printing or the like, the composition of the enclosed area is the composition of the printed layer, and may be the same as the composition of the code printed area, except that the types of components contributing to coloring, such as pigments, are different.

[0117] The enclosed area may or may not be colored. It is preferable for the enclosed area to be colored in order to improve the readability of the code printed on the lid material. If the enclosed area is colored, it is sufficient that at least the side opposite to the base material layer is colored, and the entire area, including the interior, may be colored.

[0118] While the color of the enclosed area is not particularly limited, it is preferable that it be the same color as the base layer, and more preferably white, in order to improve the readability of the code printed on the lid material and to enhance the appearance of the lid material. CIE1976L ＊ a ＊ b ＊ In the color space, the lightness L of the enclosed area on the side opposite to the substrate layer. ＊ However, it is preferable that it be between 90 and 99, and more preferably between 93 and 99.

[0119] The enclosing portion should enclose all the code printing portions as a whole (in other words, the entire code) on the side of the first surface of the base material layer (on the first surface) and in a direction parallel to the first surface of the base material layer. For example, the enclosing portion should be around the collection of all the code printing portions (code) at a distance from it (for example, L in Figures 1 and 2). １ The enclosed sections may be provided continuously without gaps, or they may be provided intermittently (discontinuously) with gaps in some areas. The enclosed section 13 in the lid material 1 shown in Figure 1 is an example of an enclosed section that continuously encloses the code printing section, and the enclosed section 23 in the lid material 2 shown in Figure 3 is an example of an enclosed section that intermittently encloses the code printing section.

[0120] The distance between the enclosed area and the code printing area (L in Figures 1 and 2) １ The minimum value of the distance is preferably 0 to 3 mm, more preferably 0.1 to 2.5 mm, and even more preferably 0.5 to 2 mm. When the minimum value of the distance is greater than or equal to the lower limit, the problem of the enclosed portion and the adjacent code printing portion overlapping during the manufacturing of the lid material can be easily suppressed, making the manufacturing of the lid material easier. When the minimum value of the distance is less than or equal to the upper limit, the above-mentioned effect obtained by the lid material having an enclosed portion is further enhanced. In Figures 1 and 2, L １ This indicates the distance between the inner circumferential surface of the enclosed area on the side of the code printing area and the longitudinal side of the code printing area. However, the distance between the enclosed area and the code printing area is not necessarily minimized at this point; the minimum distance may also occur between the inner circumferential surface of the enclosed area and the longitudinal end of the code printing area.

[0121] As explained above, the height of the enclosed area (H in Figures 2 to 4) １３ ) is the height of the code printing area (H in Figures 2 to 4). １４０ It is preferable that the height of the enclosed portion is 50 to 160% of the above. If the height of the enclosed portion is greater than or equal to the lower limit, the above-mentioned effects obtained by the lid material having an enclosed portion are further enhanced. If the height of the enclosed portion is less than or equal to the upper limit, the disadvantages caused by an excessive height of the enclosed portion are reduced. For example, if the height of the enclosed portion is too high, a large step difference will occur between the enclosed portion and the code printing portion in the thickness direction of the lid material (in other words, in the height direction of the enclosed portion and the code printing portion), causing the enclosed portion to protrude from the code printing portion, resulting in the same problems as when the code printing portion protrudes from the first surface of the base material layer.

[0122] To further enhance the advantageous effects described above, the height of the enclosed area may be, for example, 65-130% or 80-120% of the height of the code printing area.

[0123] For example, the height of the enclosed portion from the first surface of the base layer (the distance between the first surface of the base layer and the end of the enclosed portion opposite to the base layer) may be 80-120%, 90-110%, or 95-105% of the height of the code printing portion from the first surface of the base layer (the distance between the first surface of the base layer and the end of the code printing portion opposite to the base layer). When the height of the enclosed portion and the height of the code printing portion have this relationship from the first surface of the base layer, the same effect can be obtained as when the height of the enclosed portion is 50-160% of the height of the code printing portion.

[0124] The height of the enclosed area is preferably 2 to 8 μm, more preferably 3 to 7 μm, and even more preferably within this range, while also satisfying any of the relationships with the height of the code printing area described above.

[0125] The dimensions of the enclosed area in a direction parallel to the first surface of the base material layer (sometimes simply referred to as "the dimensions of the enclosed area" in this specification) can be set appropriately according to the size of a single code which is a collection of all the code printing areas, the number of codes provided on a single lid material, the size of a single lid material, etc. In this specification, the above-mentioned "dimensions of the enclosed area" means the length of a line segment created by drawing a straight line connecting any one point on the inner circumferential surface of the enclosed area and any one point on the outer circumferential surface of the enclosed area in a direction parallel to the first surface of the base material layer (in other words, when the enclosed area is viewed in a plan view from above on the side of its first surface), without crossing an area where the enclosed area is not provided. This is also true when a single lid material has two or more enclosed areas, and when two or more enclosed areas are fused together (in other words, the outer circumferential surfaces of two or more enclosed areas can be considered to be in contact with each other).

[0126] For example, if the size of a single code is a size commonly used in this field, the dimensions of the enclosure are preferably 1.5 mm or more, and may be, for example, 2 mm or more. The above-mentioned effect obtained by the lid material having an enclosure is enhanced when the dimensions of the enclosure are greater than or equal to the lower limit. On the other hand, the upper limit of the dimensions of the enclosure is less than the maximum value of the dimensions of the base material layer in a direction parallel to its first surface (for example, in the case of a long lid material, the length of the diagonal of the lid material when the base material layer is viewed from above in a plan view).

[0127] <Overcoat Layer> The overcoat layer covers the code printing area on one side (first surface) of the base material layer in the lid material, protecting the code printing area and preventing contamination of the code printing area. As described above, the overcoat layer is also provided on the side (first surface) opposite to the base material layer side of the enclosed area, and if the enclosed area is also covered, the enclosed area is also protected and contamination of the enclosed area is prevented. The overcoat layer has any configuration in the lid material of this embodiment.

[0128] The overcoat layer is preferably a resin layer containing a resin (which may be referred to as "coating resin" in this specification).

[0129] The overcoat layer may or may not contain other components besides the resin (coating resin).

[0130] The coating resin contained in the overcoat layer and the other components may each consist of only one type or two or more types, and if there are two or more types, their combination and ratio can be arbitrarily selected according to the purpose.

[0131] In the overcoat layer, the ratio of the coating resin content to the total mass of the overcoat layer is preferably 80% by mass or more, and may be, for example, 85% by mass or more, 90% by mass or more, 95% by mass or more, or 98% by mass or more. When the ratio is above the lower limit, the effect obtained by the lid material having an overcoat layer is further enhanced. On the other hand, the ratio is 100% by mass or less.

[0132] When the overcoat layer, the layers in the lid material other than the overcoat layer, and the bottom material described later all contain the same type of resin, the ratio of the content of the same type of resin to the total mass of the overcoat layer is preferably 60% by mass or more, and may be, for example, 70% by mass or more, 80% by mass or more, 90% by mass or more, or 95% by mass or more. The higher the ratio, the easier it is to monomaterialize the lid material and the blister pack packaging described later. On the other hand, the ratio is 100% by mass or less.

[0133] The other components included in the overcoat layer are non-resin components, and examples of such non-resin components include those similar to the other non-resin components included in the substrate layer described above.

[0134] The overcoat layer may consist of one layer (single layer) or of two or more layers. When the overcoat layer consists of multiple layers, these layers may be identical or different, and the combination of these layers is not particularly limited as long as it does not impair the effects of the present invention. However, usually, a single overcoat layer is sufficient.

[0135] The thickness of the overcoat layer covering areas other than the code printing area can be arbitrarily selected depending on the object being coated. For example, the thickness of the overcoat layer covering the enclosed area may be the same as the thickness of the overcoat layer covering the code printing area. The thickness of the overcoat layer covering the code printing area can be adjusted as appropriate.

[0136] <Anchor Coat Layer> The anchor coat layer is provided between the first surface of the base material layer and the code printing area, improving the adhesion between the code printing area and the first surface of the base material layer, and highly suppressing the peeling of the code printing area from the base material layer. In particular, the above effect of the anchor coat layer becomes more pronounced when the code printing area contains pigment. The anchor coat layer can have any configuration in the lid material of this embodiment, but it is preferable that the lid material of this embodiment is provided with an anchor coat layer.

[0137] In the case where the lid material of this embodiment is equipped with the anchor coat layer, the anchor coat layer of the lid material is colorless, transparent, or semi-transparent, and the first surface of the base material layer is visible through the anchor coat layer.

[0138] The anchor coat layer is preferably a resin layer containing a resin (which may be referred to as "undercoat resin" in this specification).

[0139] The anchor coat layer may or may not contain other components besides the resin (undercoat resin).

[0140] The base resin and other components included in the anchor coat layer may each consist of only one type or two or more types. If there are two or more types, their combination and ratio can be arbitrarily selected according to the purpose.

[0141] The anchor coat layer is preferably a UV-cured product of an ultraviolet (UV) curable anchor coat layer forming composition formed by a UV printing method. That is, the anchor coat layer preferably contains a UV-cured product of a UV-curable component, and more preferably the base resin contains a UV-cured product of a UV-curable resin. As the anchor coat layer forming composition, for example, a known UV-curable ink containing a UV-curable component can be used.

[0142] In the anchor coat layer, the ratio of the content of the base resin to the total mass of the anchor coat layer is preferably 80% by mass or more, and may be, for example, 85% by mass or more, 90% by mass or more, 95% by mass or more, or 98% by mass or more. When the ratio is above the lower limit, the effect obtained by the lid material having an anchor coat layer is further enhanced. On the other hand, the ratio is 100% by mass or less.

[0143] The other components contained in the anchor coat layer are non-resin components, and examples of such non-resin components include those similar to the other non-resin components contained in the substrate layer described above.

[0144] The anchor coat layer may consist of one layer (single layer) or of two or more layers. When the anchor coat layer consists of multiple layers, these layers may be identical or different, and the combination of these layers is not particularly limited as long as it does not impair the effects of the present invention. However, usually, a single anchor coat layer is sufficient.

[0145] The thickness of the anchor coat layer is not particularly limited, but is preferably 1 to 3 μm. A thickness of the anchor coat layer greater than or equal to the lower limit enhances the effects obtained by providing the anchor coat layer. A thickness of the anchor coat layer less than or equal to the upper limit avoids excessive thickness, allowing for a thinner lid material and facilitating the monomaterial construction of the lid material and the blister pack packaging described later.

[0146] <Other layers that do not fall under either the overcoat layer or the anchor coat layer (other layer (i))> The other layers that the resin film has, which do not fall under either the overcoat layer or the anchor coat layer (in this specification, they may be referred to as "other layer (i)"), can be arbitrarily selected according to the purpose and are not particularly limited, and may be, for example, a resin layer (a layer containing resin) or a non-resin layer (a layer not containing resin).

[0147] However, in order to facilitate the monomaterialization of the lid material and the blister pack packaging described later, it is preferable that the other layer (i) contains the same type of resin as the layers in the lid material other than the other layer (i) and the bottom material described later. In that case, the ratio of the content of the same type of resin to the total mass of the other layer (i) is preferably 60% by mass or more, and may be, for example, 70% by mass or more, 80% by mass or more, 90% by mass or more, and 95% by mass or more. On the other hand, the ratio is 100% by mass or less.

[0148] The lid material of this embodiment replaces the aluminum sheet used in conventional blister pack packaging. Therefore, it is preferable that the lid material of this embodiment does not include a layer (i) that mainly contains aluminum. In this specification, "a layer that mainly contains aluminum" refers to an aluminum-containing layer in which the ratio of the aluminum content (parts by mass) of the aluminum-containing layer to the total mass (parts by mass) of the lid material is 90 to 100% by mass.

[0149] It is preferable that at least the area of ​​the heat-sealed side of the lid material (the side opposite to the base layer of the sealant layer, the second side) that is actually heat-sealed does not have any other layer (i). The thickness of the other layer (i) provided on the lid material can be arbitrarily selected depending on the purpose and is not particularly limited. The other layer (i) provided on the lid material may consist of one layer (single layer) or of two or more layers. If it 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.

[0150] <Other components of the lid material> In the lid material, the total thickness of the base layer, the sealant layer, and the other layer (i) is not particularly limited, but is preferably 20 to 105 μm, more preferably 25 to 100 μm, and even more preferably 35 to 95 μm. When the total thickness is equal to or greater than the lower limit, the structure of the lid material is more stable. When the total thickness is equal to or less than the upper limit, the thickness of the lid material is avoided, and for example, in a blister pack, it becomes easier to remove the contents. Here, if the lid material does not have the other layer (i), the thickness of the other layer (i) is 0 μm.

[0151] The lid material is preferably unstretched. In a blister pack packaging with an unstretched lid material, it becomes easier to remove the contents.

[0152] <Example of a Lid Material> An example of a preferred lid material of this embodiment is a lid material for a blister pack packaging, wherein the lid material comprises a base layer, a code printing portion provided on one surface of the base layer, and a sealant layer provided on the other surface of the base layer, the base layer contains either or both of an olefin polymer and polyester and is colored, the sealant layer contains an α-olefin elastomer and an ethylene-vinyl acetate copolymer, the code printing portion is formed by ultraviolet printing, one surface of the base layer is visible between adjacent code printing portions, the lid material has a surrounding portion on one surface of the base layer that continuously or intermittently surrounds the code printing portion, the surrounding portion is formed by ultraviolet printing, and the height of the surrounding portion is 50 to 160% of the height of the code printing portion.

[0153] In such a preferred lid material, the base layer contains a propylene polymer as the olefin polymer, and the ratio of the propylene polymer content to the total content of the olefin polymer and the polyester in the base layer is one of 80-100% by mass, 85-100% by mass, 90-100% by mass, 95-100% by mass, and 98-100% by mass, and the mass ratio of [α-olefin elastomer content (parts by mass)] / [ethylene-vinyl acetate copolymer content (parts by mass)] in the sealant layer is 95 / 5 to 40 / 60. Preferably, the sealant layer contains a propylene elastomer as the α-olefin elastomer, and the ratio of the propylene elastomer content to the α-olefin elastomer content in the sealant layer is 80-100% by mass, 85-100% by mass, 90-100% by mass, 95-100% by mass, and 98-100% by mass.

[0154] In such preferred lid materials, CIE1976L ＊ a ＊ b ＊ In the color space, the lightness L of one surface of the substrate layer＊ However, the range is 80-99, CIE1976L ＊ a ＊ b ＊ In the color space, the brightness L of the code printing area. ＊ However, it is preferable that it is between 0.01 and 45.

[0155] In such preferred lid materials, it is preferable that in the base layer, the ratio of the content of propylene polymer to the total mass of the base layer is 60 to 100% by mass, 70 to 100% by mass, 80 to 100% by mass, 90 to 100% by mass, and 95 to 100% by mass, and in the sealant layer, the ratio of the content of propylene elastomer to the total mass of the sealant layer is 40% by mass or more, 60% by mass or more, and 70% by mass or more.

[0156] <<Method for Manufacturing the Lid Material>> The lid material of this embodiment can be manufactured, for example, by manufacturing an intermediate film comprising a base material layer and a sealant layer, providing a code printing section on the exposed surface of the base material layer (the first surface of the base material layer) in the intermediate film, and further, if necessary, providing one or more types selected from the group consisting of an anchor coat layer, a surrounding section, another layer (i), and an overcoat layer on the side of the first surface of the base material layer.

[0157] The aforementioned intermediate film can be manufactured, for example, by a feed block method in which several extruders are used to melt-extrude resins or resin compositions that will form each layer, a co-extrusion T-die method such as a multi-manifold method, or an air-cooled or water-cooled co-extrusion inflation method.

[0158] The resin composition that forms one of the layers in the lid material can be manufactured by adjusting the types and amounts of the constituent components so that the layer to be formed contains the desired components (constituent materials) in the desired amounts. For example, the ratio of the amounts of components that do not vaporize at room temperature in the resin composition is usually the same as the ratio of the amounts of those components in the layer formed from this resin composition.

[0159] Examples of resin compositions for forming a base layer (base layer forming composition) include resin composition (B) which contains either or both of an olefin polymer and / or polyester, and optionally the other components. Examples of resin compositions for forming a sealant layer (sealant layer forming composition) include resin composition (S) which contains the resin and optionally the other components.

[0160] Examples of resin compositions for forming an overcoat layer (overcoat layer forming composition) include a resin composition (C) comprising the coating resin, the other components as needed, and a solvent as needed. The solvent is a component that improves the fluidity of the resin composition (C) and makes it liquid, thereby enabling the resin composition (C) to be coated.

[0161] In this specification, unless otherwise specified, the term "solvent" refers not only to components capable of dissolving solutes in solution, but also to components that act as a dispersion medium in a dispersion.

[0162] When using the aforementioned resin composition, for example, a mixture of two or more components (dry blend, unmixed) may be directly fed into the extruder as the resin composition, or a pre-mixed mixture of two or more components may be fed into the extruder as the resin composition. The pre-mixed mixture can be obtained, for example, by melt-mixing two or more components using a twin-screw extruder or a Banbury mixer.

[0163] The anchor coat layer can be formed by known methods. For example, the first surface of the substrate layer is corona-treated to make the wettability of this surface preferably 35 dynes or more, 40 dynes or more, 45 dynes or more, or 50 dynes or more. Then, a UV-curable anchor coat layer forming composition for forming the anchor coat layer is extruded onto the first surface of the substrate layer after corona treatment by a UV printing method to form a printed layer for the anchor coat layer, and the anchor coat layer can be formed on the intermediate film by UV curing the printed layer for the anchor coat layer. Corona-treating the first surface of the substrate layer improves the adhesion between the first surface of the substrate layer and the anchor coat layer.

[0164] The code printing area can be formed by known methods. For example, a UV-curable printing area forming composition for forming the code printing area can be discharged onto the exposed surface in the intermediate film by a UV printing method to form a printing layer for the code printing area, and the code printing area can be formed on the intermediate film by UV curing the printing layer for the code printing area.

[0165] As described above, when manufacturing a lid material having an enclosed portion that is part of the base material layer, for example, the base material layer in the intermediate film may be adjusted to a shape having such an enclosed portion by a known method, and the code printing portion may be formed on the intermediate film in the same manner as described above. As described above, when manufacturing a lid material having an enclosed portion that is provided separately from the base material layer, for example, the code printing portion may be formed on the intermediate film in the same manner as described above, and further, the enclosed portion may be formed on the first surface side of the base material layer by a printing method such as UV printing using an enclosed portion forming composition for forming the enclosed portion. The order of forming the code printing portion and the enclosed portion is not particularly limited.

[0166] When manufacturing a lid material comprising an anchor coat layer and an enclosed portion provided separately from the base material layer, for example, in the same manner as described above, an anchor coat layer printable layer may be formed on the first surface of the base material layer by extruding a UV-curable anchor coat layer forming composition by a printing method, then a code printing portion printable layer may be formed on the exposed surface of the anchor coat layer printable layer (the surface opposite to the base material layer) by extruding a UV-curable printing portion forming composition by a printing method, and an enclosed portion printable layer may be formed by extruding a UV-curable enclosed portion forming composition by a printing method, and then the anchor coat layer, code printing portion printable layer and enclosed portion printable layer may be UV-cured simultaneously to form the anchor coat layer, code printing portion and enclosed portion at the same time.

[0167] In this case, the order in which the enclosed area printing layer and the code printing layer are formed is not particularly limited; either the enclosed area printing layer or the code printing layer may be formed first (or last), or they may be formed simultaneously. In this case, the order in which the anchor coat layer printing layer, the enclosed area printing layer, and the code printing layer are UV cured is not particularly limited; any of the anchor coat layer printing layer, the enclosed area printing layer, or the code printing layer may be formed first (or last), or some or all of them may be formed simultaneously.

[0168] A lid material with an overcoat layer can be manufactured, for example, by the following method. First, a code printing area is formed on the first surface of the base material layer in the intermediate film. The resulting material corresponds to a lid material without an overcoat layer. At this time, if necessary, either or both of the surrounding area and the anchor coat layer may be further formed on the first surface of the base material layer. Next, a liquid resin composition (C) is applied to the side of the first surface of the base material of the lid material in a known manner to cover the code printing area, and the lid material is dried as necessary to form an overcoat layer. In this way, a lid material having an overcoat layer covering the code printing area on the side of the first surface of the base material layer can be manufactured. This manufacturing method is suitable when forming an overcoat layer that is in contact with all of the following, as shown in Figure 4: the first surface of the base material layer, the inner surface of the surrounding area, and the side surface of the code printing area. Alternatively, a lid material with an overcoat layer covering the code printing area can be manufactured by applying a liquid resin composition (C) to the release treatment surface of the release film by a known method and drying it as needed to form an overcoat layer on the release film, and then bonding the exposed surface of this overcoat layer opposite to the release film side to the end of the lid material opposite to the base layer side of the code printing area. The release film can be removed from the overcoat layer before the lid material is used. This manufacturing method is suitable when forming an overcoat layer that does not come into contact with any or all of the first surface of the base layer, the inner circumferential surface of the enclosure, and the side surface of the code printing area, unlike the case shown in Figure 4.

[0169] <<Blister Packaging>> A blister pack packaging according to one embodiment of the present invention is composed of a lid material and a bottom material and a seal according to the above embodiment of the present invention. The lid material in the blister pack packaging of this embodiment is equipped with a code formed by a code printing section, so that the management of the blister pack packaging is made easy by obtaining the information recorded in the code.

[0170] The blister pack packaging of this embodiment can be made monomaterial by including the same type of resin as the lid material in the bottom material, more specifically, the same type of resin as the olefin polymer or polyester, and has high reusability.

[0171] Figure 5 is a schematic perspective view showing an example of a blister pack packaging according to this embodiment, and Figure 6 is a cross-sectional view of the blister pack packaging shown in Figure 5 along the line VI-VI. The blister pack packaging 101 shown here comprises a lid material 8 and a bottom material 9, and is constructed by sealing these together. The planar shape of the blister pack packaging 101 is rectangular. The lid material 8 is a lid material according to the above-described embodiment. The bottom material 9 is a molded resin film.

[0172] In this specification, when referring to both the lid material and the base material, the lid material may be referred to as "resin film for lid material," and the resin film used to form the base material by molding may be referred to as "resin film for base material."

[0173] In Figures 5 and 6, the distinction between each layer in the lid material and the distinction between each layer in the base material are both omitted.

[0174] The bottom material 9 has multiple recesses 91 that protrude from one side of the bottom material 9 (sometimes referred to as the "first side" in this specification) 9a and have openings on the other side of the bottom material 9 (sometimes referred to as the "second side" in this specification) 9b. In the blister pack packaging 101, the bottom material 9 is positioned with its second side 9b facing the lid material 8, and the first side 9a of the bottom material 9 is one of the outermost surfaces (exposed surfaces) of the blister pack packaging 101.

[0175] One side of the lid material 8 (sometimes referred to as the "first side" in this specification) 8a is the other outermost surface (exposed surface) of the blister pack packaging 101, and in the blister pack packaging 101, the lid material 8 is positioned with its other side (sometimes referred to as the "second side" in this specification) 8b facing the bottom material 9 side.

[0176] When the lid material 8 is the lid material 1 shown in Figures 1 and 2, the second surface 11b of the sealant layer 11 corresponds to the second surface 8b of the lid material 8, and the side of the enclosure 13 opposite to the base layer 12 corresponds to a part of the first surface 8a of the lid material 8. The code printing section 140 occupies a part of the first surface 8a of the lid material 8. When the lid material 8 is the lid material 3 shown in Figure 4, the side of the overcoat layer 15 opposite to the base layer 12 corresponds to the first surface 8a of the lid material 8.

[0177] The blister pack packaging 101 is constructed by sealing (heat sealing) the second surface 8b of the lid material 8 and the area of ​​the second surface 9b of the bottom material 9 where the recess 91 is not provided. The area of ​​the second surface 9b of the bottom material 9 where the recess 91 is provided is not sealed with the second surface 8b of the lid material 8, and in this area, the second surface 9b of the bottom material 9 and the second surface 8b of the lid material 8 form a storage section 198. The contents 7 are sealed and stored in the storage section 198 of the blister pack packaging 101.

[0178] The opening of the recess 91 is circular or nearly circular (approximately circular). In this specification, "approximately circular" means a shape that is not circular but is approximate to a circular shape to the extent that it cannot be clearly recognized as non-circular by visual inspection. The bottom surface of the recess 91 may be either flat or non-flat (e.g., curved). When a cross-section is formed in the recess 91 in a direction parallel to the surface of the flat portion of the bottom material 9 (the area where the recess 91 is not provided), it is preferable that the opening of the recess 91 (cross-sectional opening) is similar in shape to the above-mentioned opening, that is, approximately circular (circular or nearly circular).

[0179] The inner diameter of the opening of the recess 91 is preferably 8 to 15 mm. The depth of the recess 91 is preferably 3 to 8 mm. If the bottom surface of the recess 91 is not flat, the depth at the deepest part of the recess is preferably within the above numerical range.

[0180] A slit 92 is formed on the first surface 9a of the base material 9. More specifically, in the base material 9, multiple slits 92 are formed parallel to each other in the width direction of the blister pack packaging 101. Each slit 92 is formed over the entire width of the blister pack packaging 101. The presence of the slits 92 allows the blister pack packaging 101 to be easily divided into specific numbers of storage compartments 198, thereby increasing the convenience of the blister pack packaging 101.

[0181] The stored item 7 is preferably a tablet. Examples of tablets include those that have physical properties similar to ordinary pharmaceuticals, such as hardness.

[0182] The blister pack packaging of this embodiment is not limited to the blister pack packaging 101 shown in Figures 5 to 6, and some components of the blister pack packaging 101 may be changed, deleted, or added without departing from the spirit of the present invention. For example, in the blister pack packaging 101, two rows of storage compartments 198 are provided in the width direction and four rows of storage compartments 198 are provided in the length direction, but the number of storage compartments provided in the width direction and length direction of the blister pack packaging of this embodiment is not limited to these. For example, in the blister pack packaging 101, a slit 92 is provided in the bottom material 9, but the bottom material in the blister pack packaging of this embodiment does not have to have a slit. For example, in the blister pack packaging 101, the opening of the recess 91 in the bottom material 9 is circular or substantially circular (approximately circular), but in the blister pack packaging of this embodiment, the opening of the recess in the bottom material may be of any other shape. Similarly, when a cross-section is formed in the recess in a direction parallel to the surface (first surface) of the flat portion of the bottom material (the area where the recess is not provided), the opening of the recess may be circular or substantially circular, or it may be any other shape. The shape of the recess can be arbitrarily set according to the shape of the stored items.

[0183] Next, the base material constituting the blister pack packaging of this embodiment will be described in more detail.

[0184] ◎Bottom material, resin film for bottom material Examples of a resin film for forming the bottom material (resin film for bottom material) include a base layer and a sealant layer provided on one surface of the base layer (sometimes referred to as the "first surface" in this specification). The resin film (resin film for bottom material) may further include an outer layer provided on the other surface of the base layer (sometimes referred to as the "second surface" in this specification).

[0185] In this specification, when referring to both the lid material and the base material, the base material layer and sealant layer in the base material or resin film for the base material may be referred to as the "second base material layer" and the "second sealant layer," respectively. To distinguish the base material layer and sealant layer in the lid material or resin film for the lid material from the "second base material layer" and the "second sealant layer," they may be referred to as the "first base material layer" and the "first sealant layer," respectively.

[0186] The resin film for the base material may or may not include any other layer that does not correspond to the second base layer, the second sealant layer, or the outer layer. However, it is preferable that the resin film for the base material does not have any of the other layers on the side of the second sealant layer opposite to the second base layer (exposed surface, sealing surface), and it is preferable that there is no other layer between the second base layer and the second sealant layer.

[0187] <Second base material layer> The second base material layer is the main layer of the resin film for the base material, and it allows the resin film for the base material to maintain its structure stably, and enables the molded base material to constitute a blister pack packaging.

[0188] The second substrate layer preferably contains a propylene polymer, but may or may not contain other components that are not propylene polymers.

[0189] The propylene polymer contained in the second substrate layer and the other components may each consist of only one type or two or more types. If there are two or more types, their combination and ratio can be arbitrarily selected according to the purpose.

[0190] In the second base layer, the ratio of the total content of all components (propylene polymer and other components) in the second base layer to the total mass of the second base layer does not exceed 100% by mass. Similarly, in the resin composition for forming the second base layer, which will be described later, the ratio of the total content of all components in the resin composition to the total mass of the resin composition does not exceed 100% by mass.

[0191] The propylene polymer contained in the second base layer can be the same as the propylene polymer contained in the first base layer (homopolypropylene, propylene copolymer). The higher the homopolypropylene (hPP) content of the second base layer, the more stable the structure of the resin film for the base material becomes, and the higher the propylene copolymer content of the second base layer, the lower the molding temperature of the resin film for the base material can be, making it easier to mold the resin film.

[0192] The other components included in the second base layer may be either resin components or non-resin components.

[0193] Among the other components contained in the second substrate layer, the resin component is not particularly limited as long as it is not a propylene polymer. Among the other components contained in the second substrate layer, the non-resin component is, for example, the same as the non-resin component contained in the first substrate layer.

[0194] In the second base layer, the ratio of the content of the propylene polymer to the total mass of the second base layer is preferably 80% by mass or more, and may be, for example, 85% by mass or more, 90% by mass or more, 95% by mass or more, or 98% by mass or more. When the ratio is above the lower limit, the effect obtained by the inclusion of the propylene polymer in the second base layer is further enhanced. On the other hand, the ratio is 100% by mass or less. Here, "content of propylene polymer" refers to the total content of homopolypropylene and propylene copolymer. For example, if the second base layer does not contain a propylene copolymer, the content of propylene copolymer in the second base layer is 0 parts by mass.

[0195] A more preferable second base material layer, in that it provides an even greater effect in easily forming the resin film for the base material, is one in which the propylene polymer contains homopolypropylene and does not contain a propylene copolymer, or contains homopolypropylene and a propylene copolymer, and in the second base material layer, the ratio of the homopolypropylene content to the total mass of the second base material layer is 70 to 100% by mass, and in the second base material layer, the ratio of the propylene copolymer content to the total mass of the second base material layer is 0 to 30% by mass.

[0196] When the second base layer, the layers in the bottom material other than the second base layer, and the lid material all contain the same type of resin, the ratio of the content of the same type of resin to the total mass of the second base layer is preferably 60% by mass or more, and may be, for example, 70% by mass or more, 80% by mass or more, 90% by mass or more, or 95% by mass or more. The higher the ratio, the easier it is to monomaterialize the bottom material and the blister pack packaging described later. On the other hand, the ratio is 100% by mass or less.

[0197] The second base layer may consist of one layer (single layer) or of two or more layers. When the second base layer consists of multiple layers, these layers may be identical or different, and the combination of these layers is not particularly limited as long as it does not impair the effects of the present invention. However, usually, a single layer of the second base layer is sufficient.

[0198] The thickness of the second base material layer is not particularly limited, but is preferably 220 to 297 μm, more preferably 226 to 291 μm, and even more preferably 232 to 288 μm. When the thickness of the second base material layer is greater than or equal to the lower limit, the structure of the second base material layer becomes more stable. When the thickness of the second base material layer is less than or equal to the upper limit, the thickness of the second base material layer is avoided, and the resin film for the base material can be made thinner.

[0199] <Second sealant layer> The second sealant layer enables heat sealing of the bottom material to the lid material. The second sealant layer preferably contains homopolypropylene and an α-olefin elastomer, and may or may not contain ethylene-vinyl acetate copolymer (EVA). Furthermore, the second sealant layer may or may not contain other components that do not fall under homopolypropylene, α-olefin elastomer, or ethylene-vinyl acetate copolymer.

[0200] The homopolypropylene, α-olefin elastomer, ethylene-vinyl acetate copolymer, and the other components contained in the second sealant layer may each be present as a single type or as two or more types. If there are two or more types, their combinations and ratios can be arbitrarily selected according to the purpose.

[0201] In the second sealant layer, the ratio of the total content of all components of the second sealant layer (homopolypropylene, α-olefin elastomer, ethylene-vinyl acetate copolymer, and the other components) to the total mass of the second sealant layer does not exceed 100% by mass. Similarly, in the resin composition for forming the second sealant layer, as described later, the ratio of the total content of all components of the resin composition to the total mass of the resin composition does not exceed 100% by mass.

[0202] The homopolypropylene contained in the second sealant layer is the same as the homopolypropylene contained in the first substrate layer. The α-olefin elastomer and ethylene-vinyl acetate copolymer contained in the second sealant layer are the same as the α-olefin elastomer and ethylene-vinyl acetate copolymer contained in the first sealant layer, respectively.

[0203] The other components included in the second sealant layer may be either resin components or non-resin components.

[0204] Among the other components contained in the second sealant layer, the resin component is not particularly limited as long as it does not fall under any of homopolypropylene, α-olefin elastomer, or ethylene-vinyl acetate copolymer. Among the other components contained in the second sealant layer, the non-resin component is, for example, the same as the non-resin component contained in the first substrate layer.

[0205] The bottom material of a blister pack packaging is manufactured by heat molding a resin film for the bottom material. In this process, an auxiliary mold called a plug is pressed against the heated resin film for the bottom material to form a recess. However, in the second sealant layer of the resin film for the bottom material, if the content of homopolypropylene relative to the total mass of the second sealant layer is 50% by mass or more, adhesion of the recess of the bottom material to the plug is suppressed, and the recess tends to be formed normally with good reproducibility. To further enhance this effect, the aforementioned percentage may be, for example, 55% by mass or more, 60% by mass or more, 65% by mass or more, or 75% by mass or more. On the other hand, since the second sealant layer contains an α-olefin elastomer, it is preferable that the aforementioned percentage be 85% by mass or less.

[0206] In the second sealant layer, the proportion of α-olefin elastomer content relative to the total mass of the second sealant layer is preferably 15% by mass or more, which increases the sealing strength of the bottom material and lid material. On the other hand, because the second sealant layer contains homopolypropylene, the proportion is preferably 50% by mass or less, and may be, for example, 45% by mass or less, 40% by mass or less, 35% by mass or less, 30% by mass or less, and 25% by mass or less.

[0207] When using blister pack packaging, it is usually unnecessary to separate the lid from the bottom material, but sometimes the lid is intentionally separated from the bottom material. In this case, if the second sealant layer further contains ethylene-vinyl acetate copolymer, the peeled surface of the bottom material will have a superior appearance. To make this effect more pronounced, it is preferable that the ratio of ethylene-vinyl acetate copolymer content to the total mass of the second sealant layer is 10% by mass or more. On the other hand, it is preferable that the ratio be 40% by mass or less to obtain a good balance between the effect of increasing the seal strength of the bottom material and the lid material and the effect of having a superior appearance on the peeled surface of the bottom material.

[0208] In the second sealant layer, the total content ratio of homopolypropylene, α-olefin elastomer, and ethylene-vinyl acetate copolymer relative to the total mass of the second sealant layer is preferably 80% by mass or more, for example, 85% by mass or more, 90% by mass or more, 95% by mass or more, and 98% by mass or more. The effect obtained by using these resins is enhanced when the ratio is above the lower limit. On the other hand, the ratio is 100% by mass or less.

[0209] When the second sealant layer, the layers in the base material other than the second sealant layer, and the lid material all contain the same type of resin, the ratio of the content of the same type of resin to the total mass of the second sealant layer is preferably 60% by mass or more, and may be, for example, 70% by mass or more, 80% by mass or more, 90% by mass or more, or 95% by mass or more. The higher the ratio, the easier it is to monomaterialize the base material and the blister pack packaging described later. On the other hand, the ratio is 100% by mass or less.

[0210] The second sealant layer may consist of one layer (single layer) or of two or more layers. If the second sealant layer consists of multiple layers, these layers may be identical or different, and the combination of these layers is not particularly limited as long as it does not impair the effects of the present invention. However, usually, a single layer of the second sealant layer is sufficient.

[0211] The thickness of the second sealant layer is not particularly limited, but is preferably 3 to 30 μm, more preferably 9 to 24 μm, and even more preferably 12 to 18 μm. When the thickness of the second sealant layer is equal to or greater than the lower limit, the structure of the second sealant layer becomes more stable, and the sealing strength of the bottom material and lid material becomes higher. When the thickness of the second sealant layer is equal to or less than the upper limit, the thickness of the second sealant layer is avoided, and the resin film for the bottom material can be made thinner.

[0212] <Outer layer> The outer layer protects the structure of the resin film for the base material or the base material on the second sealant layer side from the outer layer. The outer layer may also be easier to form a printed layer corresponding to the other layers than the second base material layer.

[0213] In order to improve the properties of the resin film for the base material as a base material for blister pack packaging, it is preferable that the components of the outer layer are the same as those of the second sealant layer. For example, the components of the outer layer and their content (i.e., composition) may be the same as those of the second sealant layer.

[0214] If the composition of the outer layer is the same as that of the second sealant layer, the types and manner of composition of the components contained in the outer layer are the same as those of the second sealant layer, so a detailed explanation is omitted here.

[0215] The outer layer may consist of one layer (single layer) or of two or more layers. If the outer layer consists of multiple layers, these layers may be identical or different, and the combination of these layers is not particularly limited as long as it does not impair the effects of the present invention. However, usually, a single outer layer is sufficient.

[0216] The thickness of the outer layer is not particularly limited, but is preferably 3 to 30 μm, more preferably 9 to 24 μm, and even more preferably 12 to 18 μm. When the thickness of the outer layer is above the lower limit, the structure of the outer layer becomes more stable. When the thickness of the outer layer is below the upper limit, the thickness of the outer layer is avoided, and the resin film for the base material can be made thinner.

[0217] In terms of improving the properties of the resin film for the base material, it is preferable that the outer layer is identical to the second sealant layer in terms of its composition and thickness. Such a resin film for the base material has, for example, a high curl suppression effect.

[0218] <Other Layers> The other layers provided in the resin film for the base material can be arbitrarily selected according to the purpose and are not particularly limited; for example, they may be a resin layer or a non-resin layer. However, in terms of facilitating the monomaterialization of the base material and the blister pack packaging, it is preferable that the other layers contain the same type of resin as the layers other than the other layers in the base material and the lid material. In that case, the ratio of the content of the same type of resin to the total mass of the other layers is preferably 60% by mass or more, and may be, for example, 70% by mass or more, 80% by mass or more, 90% by mass or more, and 95% by mass or more. On the other hand, the ratio is 100% by mass or less. The thickness of the other layers provided in the resin film for the base material can also be arbitrarily selected according to the purpose and are not particularly limited. The other layers provided in the resin film for the base material may consist of one layer (single layer) or two or more layers. If there are multiple layers, these layers may be identical or different from each other, and the combination of these layers is not particularly limited as long as it does not impair the effects of the present invention.

[0219] <Other configurations of the resin film for the base material> The thickness of the resin film for the base material is not particularly limited, but is preferably 200 to 350 μm. When the thickness of the resin film for the base material is above the lower limit, the structure of the resin film for the base material becomes more stable. When the thickness of the resin film for the base material is below the upper limit, the thickness of the resin film for the base material is avoided, and the base material can be made thinner.

[0220] The resin film for the base material is preferably an unoriented film. An unoriented resin film for the base material has higher moldability.

[0221] <Other components of the base material> The base material is a heat-molded body of a resin film for base materials. The thickness of the flat portion of the base material may be the same as the thickness of the resin film for base materials described above.

[0222] <Example of a blister pack packaging> An example of a preferred blister pack packaging according to this embodiment is a blister pack packaging composed of a seal between a lid material and a bottom material, wherein the lid material comprises a first base material layer, a code printing portion provided on one surface of the first base material layer, and a first sealant layer provided on the other surface of the first base material layer, the first base material layer contains either or both of an olefin polymer and polyester and is colored, the code printing portion is formed by an ultraviolet printing method, one surface of the first base material layer is visible between adjacent code printing portions, and the bottom material is a molded body of a resin film for bottom material comprising a second base material layer and a second sealant layer provided on one surface of the second base material layer, the second base material layer contains a propylene polymer, and the second sealant layer contains homopolypropylene and an α-olefin elastomer.

[0223] A more preferred example of a blister pack packaging according to this embodiment is a blister pack packaging composed of a seal between a lid material and a bottom material, wherein the lid material comprises a first base material layer, a code printing portion provided on one surface of the first base material layer, and a first sealant layer provided on the other surface of the first base material layer, wherein the first base material layer contains a propylene polymer and is colored, the first sealant layer contains a propylene elastomer and an ethylene-vinyl acetate copolymer, the code printing portion is formed by ultraviolet printing, one surface of the first base material layer is visible between adjacent code printing portions, and in the first base material layer, the ratio of the content of the propylene polymer to the total mass of the first base material layer is one of 60 to 100% by mass, 70 to 100% by mass, 80 to 100% by mass, 90 to 100% by mass, and 95 to 100% by mass. In the first sealant layer, the ratio of the content of the propylene-based elastomer to the total mass of the first sealant layer is any of 40% by mass or more, 60% by mass or more, and 70% by mass or more. The base material is a molded body of a resin film for base material comprising a second base layer and a second sealant layer provided on one surface of the second base layer, the second base layer contains a propylene-based polymer, the second sealant layer contains homopolypropylene and a propylene-based elastomer, in the second base layer, the ratio of the content of the propylene-based polymer to the total mass of the second base layer is any of 60-100% by mass, 70-100% by mass, 80-100% by mass, 90-100% by mass, and 95-100% by mass, and in the second sealant layer, the ratio of the content of the homopolypropylene to the total mass of the second sealant layer is 60-85% by mass. A blister pack packaging is provided in which, in the second sealant layer, the ratio of the content of the propylene-based elastomer to the total mass of the second sealant layer is 15 to 40% by mass, provided that, in the second sealant layer, the ratio of the total content of the homopolypropylene and the propylene-based elastomer to the total mass of the second sealant layer does not exceed 100% by mass.

[0224] <<Method for Manufacturing Blister Packaging>> The blister pack packaging can be manufactured in the same way as known blister pack packaging, except that it uses a lid material according to the above-described embodiment of the present invention. For example, the blister pack packaging can be manufactured by heat-sealing the lid material and the bottom material while forming a storage compartment and storing the item to be packaged in the storage compartment.

[0225] The bottom material can be manufactured by known methods. For example, the bottom material can be manufactured by forming the recesses in the resin film for the bottom material using a known PTP packaging machine by plug molding, air-assisted plug molding, pressure molding, plug-assisted pressure molding, vacuum molding, etc.

[0226] The molding temperature of the resin film for the base material is preferably 125 to 145°C. When molding the resin film using a plug, the temperature of the heating plate is preferably within the above numerical range, and the plug temperature is preferably 15 to 25°C.

[0227] During heat sealing of the lid material and the bottom material, the sealing temperature is preferably 120 to 160°C, the sealing speed is preferably 3 to 12 m / min, and the sealing pressure is preferably 0.2 to 0.5 MPa.

[0228] When providing a slit in the base material (for example, a slit 92 in the case of base material 9 shown in Figures 5 and 6), the slit can be formed in the base material by a known method using a sewing blade or a half-cut blade.

[0229] Examples of resin compositions for forming a second base layer (composition for forming a second base layer) include a resin composition (B2) comprising a propylene polymer and, if necessary, the other components. Examples of resin compositions for forming a second sealant layer (composition for forming a second sealant layer) include a resin composition (S2) comprising homopolypropylene, an α-olefin elastomer, if necessary, an ethylene-vinyl acetate copolymer and, if necessary, the other components.

[0230] The resin composition for forming each layer in the resin film for the base material can be manufactured in the same manner as the resin composition for forming each layer in the resin film for the lid material, and can be used in the same manner.

[0231] The present invention will be described in more detail below with reference to specific examples. However, the present invention is not limited in any way to the examples shown below.

[0232] The raw materials used in each example or comparative example are as follows: hPP: Homopolypropylene (Sumitomo Chemical Co., Ltd. "Sumitomo Noblen® FS2011DG2", melting point 158°C, melt flow rate (230°C) 2.5 g / 10 min) TPO: α-olefin elastomer (propylene elastomer, Mitsui Chemicals, Inc. "Tafmer XM7080", melt flow rate (190°C) 3 g / 10 min, melting point 83°C) EVA: Ethylene-vinyl acetate copolymer (Mitsui-Dow Polychemicals, Inc. "Evaflex V5714C", melt flow rate (190°C) 2.7 g / 10 min, melting point 89°C, vinyl acetate content 16% by mass) White pigment masterbatch: DIC Corporation "PEONY WHITE F-11060, a masterbatch containing titanium(IV) oxide (50-60% by mass) and polyethylene (30-40% by mass).

[0233] [Example 1] <<Manufacturing of Lid Material>> <Manufacturing of Resin Composition> At room temperature, the TPO (50 parts by mass) and the EVA (50 parts by mass) were uniformly mixed to produce a resin composition (S11) for forming the first sealant layer.

[0234] A resin composition (B11) for forming the first base layer was produced by uniformly mixing the hPP (90 parts by mass) and the white pigment masterbatch (10 parts by mass, 5 to 6 parts by mass as titanium(IV) oxide, and 3 to 4 parts by mass as polyethylene) at room temperature.

[0235] <Manufacturing of Intermediate Film> By co-extruding the resin composition (S11) and the resin composition (B11) in this order, a first sealant layer (thickness 4 μm) and a first base layer (thickness 36 μm) are laminated in this order in the thickness direction, and an unstretched, long intermediate film (thickness 40 μm) is manufactured in which the first base layer is white.

[0236] <Manufacturing of Lid Material> Using a corona treatment device (HFSS-101 manufactured by Kasuga Electric Co., Ltd.), the entire surface of one side (first surface) of the first substrate layer in the intermediate film obtained above was subjected to corona treatment to make the wettability of this surface 36 dynes or higher.

[0237] Using a UV printing apparatus (Fujifilm's "UV Inkjet Digital Press Jet Press 540WV"), an inkjet primer containing a UV-curable resin (manufactured by Fujifilm) was dispensed onto the entire surface of one side (first surface) of the first substrate layer in the corona-treated intermediate film obtained above, thereby forming a printed layer for the anchor coat layer.

[0238] Furthermore, using the UV printing apparatus, a UV-curable inkjet ink (manufactured by Fujifilm Corporation) containing a UV-curable resin was ejected as a composition for forming the surrounding area to the region that would continuously surround the barcode printing area on the exposed surface of the anchor coat layer printing layer (the surface opposite to the first substrate layer), thereby forming the surrounding area printing layer. At the same time, a UV-curable inkjet ink (manufactured by Fujifilm Corporation) containing a UV-curable resin was ejected as a composition for forming the printing area to the region that would be surrounded by the surrounding area, thereby forming the barcode printing area printing layer. The UV printing speed was set to 30 m / min when forming the surrounding area printing layer and the barcode printing area printing layer.

[0239] Next, the printing layer for the anchor coat layer, the printing layer for the border area, and the printing layer for the barcode area on the intermediate film were simultaneously UV-cured. As a result, a colorless, transparent anchor coat layer (thickness 1-3 μm) was formed on one side (first surface) of the first substrate layer in the intermediate film, and a white border area (height 4-6 μm) and a black barcode area (height 4-6 μm) were formed on the side of this anchor coat layer opposite to the first substrate layer (UV printing was performed).

[0240] The minimum distance between the enclosed area and the barcode printing area was set to 1.5 mm, and the barcode type was limited to GS1 DataBar. The sum of the thickness of the anchor coat layer and the height of the enclosed area was approximately 7 μm, and the sum of the thickness of the anchor coat layer and the height of the barcode printing area was also approximately 7 μm.

[0241] Based on the above, a lid material with the configuration shown in Figures 1 and 2 was manufactured.

[0242] <<Manufacturing of base material>> <Manufacturing of resin composition> At room temperature, the hPP (80 parts by mass) and the TPO (20 parts by mass) were mixed to produce a resin composition (S21) for forming the second sealant layer.

[0243] <Manufacturing of resin film for base material> By co-extruding the resin composition (S21), the hPP, and the resin composition (S21) in this order, a long, unstretched resin film (resin film for base material) (300 μm thick) was manufactured, comprising a second sealant layer (15 μm thick), a second base material layer (270 μm thick), and an outer layer (15 μm thick) laminated in this order in the thickness direction.

[0244] <Manufacturing of the base material> Using a packaging machine (CKD Corporation's "FBP-300E"), the base material was manufactured by plug molding on the long resin film obtained above, under the following molding conditions, by forming numerous recesses with openings on the exposed surface of the second sealant layer. [Molding conditions] Molding mold: Lens-shaped, Size (opening diameter): 10 mm diameter, Depth: 5 mm Heating plate temperature: 134°C Plug temperature: 20°C

[0245] <<Manufacturing of Blister Pack Packaging>> The lid material and bottom material obtained above are sealed at a sealing temperature of 135°C, a sealing speed of 11 m / min, and a sealing pressure of 0.45 MPa (4.6 kgf / cm²). ２ The product was heat-sealed under the following conditions. At this time, the side of the bottom material on which the recess is open (i.e., the exposed side of the second sealant layer) was sealed with the exposed side of the first sealant layer of the lid material. As a result, a blister pack packaging was manufactured in which the numerous recesses of the bottom material were sealed by the lid material.

[0246] <<Evaluation of the lid material>> <Brightness L of one side of the base layer> ＊ , and the brightness L of the side opposite to the substrate layer side of the enclosed area ＊ Measurement > For one side (first surface) of the first base material layer in the lid material obtained above, a colorimeter (Konica Minolta "Spectrophotometer CM-26dG") was used to measure CIE1976L ＊ a ＊ b ＊ In the color space, lightness L ＊ , chromaticity a ＊ and chromaticity b ＊ The following was measured: Brightness L ＊ The measured values ​​are shown in Table 1. Similarly, the brightness L was measured for the side (first surface) opposite to the base material layer of the enclosed part in the lid material. ＊ , chromaticity a ＊ and chromaticity b ＊ The following was measured: Brightness L ＊ The measured values ​​are shown in Table 1.

[0247] <Brightness L of the code printing area> ＊ Measurement > For the code printed area in the lid material obtained above, a colorimeter (Konica Minolta "Spectrophotometer CM-26dG") was used to measure CIE1976L from the side opposite to the first substrate layer. ＊ a ＊ b ＊ In the color space, lightness L ＊ , chromaticity a ＊ and chromaticity b ＊ The following was measured: Brightness L ＊ The measured values ​​are shown in Table 1.

[0248] <Evaluation of the readability of the printed barcode> The readability of the printed barcode was evaluated using a multi-barcode verification machine (Munazo Co., Ltd.'s "TruCheck USB Omni") in accordance with ISO-IEC 15416:2016. Grades A to C were judged as passing, and grades D to F were judged as failing. The results are shown in Table 1.

[0249] <<Manufacturing of lid material, manufacturing of base material, manufacturing of blister pack packaging, and evaluation of lid material>> [Comparative Example 1] A comparative resin composition (BR1) for forming the first base layer was manufactured in the same manner as in Example 1, except that hPP (10 parts by mass) was used instead of the white pigment masterbatch (10 parts by mass). That is, a comparative resin composition (BR1) without white pigment was manufactured. Subsequently, a colorless, transparent or translucent comparative intermediate film, a lid material, and a blister pack packaging were manufactured in the same manner as in Example 1, except that the resin composition (BR1) was used instead of the resin composition (B11). The base material was manufactured in the same manner as in Example 1. The obtained lid material was evaluated in the same manner as in Example 1. The results are shown in Table 1.

[0250] [Comparative Example 2] A comparative intermediate film (thickness 40 μm) was manufactured in the same manner as in Comparative Example 1. An anchor coat layer, similar to that in Example 1, was provided on one side (first side) of the first base material layer in the obtained intermediate film. Subsequently, in addition to forming the white enclosure, a white printed area with the same composition as the white enclosure was formed (UV printing was performed) using the enclosure-forming composition in the area between adjacent barcode printed areas on the exposed surface of the anchor coat layer (the side opposite to the first base material layer), and a barcode printed area was formed (UV printing was performed) in the area where the white printed area becomes the auxiliary printed area as described above. A comparative lid material was manufactured in the same manner as in Example 1, except that the conditions for forming the white enclosure, the white auxiliary printed area, and the barcode printed area were all the same as in Example 1. From here on, a blister pack packaging was manufactured in the same manner as in Example 1, except that this comparative lid material was used. The bottom material was manufactured in the same manner as in Example 1. The obtained lid material was evaluated in the same manner as in Example 1. The results are shown in Table 1.

[0251]

[0252] As is clear from the above results, in Example 1, the code printed area on the surface of the lid material had excellent readability. In the lid material of Example 1, the code printed area was formed by UV printing, and in all adjacent code printed areas (all code printed gaps), almost the entire area of ​​one surface of the first base material layer was visible. That is, in all code printed gaps, the ratio of the area of ​​the visible area on the first surface of the first base material layer to the area of ​​the area where the code printed area is not provided was 80% or more. Furthermore, in the lid material of Example 1, the first base material layer was white.

[0253] In Example 1, the brightness L of one side (first surface) of the first substrate layer ＊ The value is 95, and the brightness of the code printing area is L ＊ The value was 25, and all were within an appropriate range.

[0254] In the blister pack packaging of Example 1, the first base material layer in the lid contains hPP as the main constituent material, and the first sealant layer contains TPO as the main constituent material, while the second base material layer in the bottom material is made of hPP, and the second sealant layer is made of hPP and TPO. In other words, the blister pack packaging was made monomaterial, resulting in high reusability.

[0255] In contrast, in Comparative Example 1, the code printed on the surface of the lid material was unreadable, resulting in poor readability. In the lid material of Comparative Example 1, the first base material layer was colorless and transparent or semi-transparent. As a result, in Comparative Example 1, the brightness L of one side (first surface) of the first base material layer was poor. ＊ It was not possible to measure it.

[0256] In Comparative Example 2, the code printing on the surface of the lid material was unreadable and had poor readability. In the lid material of Comparative Example 2, a white auxiliary printing area was formed on the first surface of the first substrate layer in the code printing gaps between all adjacent code printing areas (all code printing gaps) so that the first surface of the colorless, transparent or translucent first substrate layer would not be visible as much as possible. In all code printing gaps, the ratio of the area of ​​the visible area of ​​the first surface of the first substrate layer to the area of ​​the area where the code printing area is not provided was far below 60%. However, a part of the code printing area covered the surface of the white auxiliary printing area. Furthermore, as a result, the black of the code printing area and the white of the auxiliary printing area interfered with each other. As a result, in Comparative Example 2, the brightness L of one surface (first surface) of the first substrate layer ＊ The measurement was not possible. Thus, it was difficult to manufacture the lid material of Comparative Example 2 with good quality.

[0257] The present invention can be used in the manufacture of blister pack packaging in which the lid material has a code printing section, and blister pack packaging with high reusability is preferred.

[0258] 1, 2, 3, 8... Lid material, 8a... One side of the lid material (first side), 8b... The other side of the lid material (second side) 11... Sealant layer, 11b... The side of the sealant layer opposite to the base layer (second side) 12... Base layer (first base layer), 12a... One side of the base layer (first side), 12b... The other side of the base layer (second side) 13, 23... Enclosed section, 231... First enclosed section, 232... Second enclosed section, 233... Third enclosed section, 234... Fourth enclosed section, 23c... Inner circumferential surface of the enclosed section on the side with the code printing, 23d... Outer circumferential surface of the enclosed section opposite to the side with the code printing 14... Code, 140... Code printing section 15... Overcoat layer H １３ ...Height of the enclosed area H １４０ ...Height of the code printing area L １ ...Distance between the enclosed area and the code printing area 101...Blister pack packaging 198...Storage area 7...Storage items 9...Bottom material, 9a...One side of the bottom material (first side), 9b...The other side of the bottom material (second side), 91...Recess, 92...Slit

Claims

1. A lid material for a blister pack packaging, wherein the lid material comprises a base layer, a code printing portion provided on one surface of the base layer, and a sealant layer provided on the other surface of the base layer, the base layer contains either or both of an olefin polymer and polyester and is colored, the code printing portion is formed by ultraviolet printing, and one surface of the base layer is visible between adjacent code printing portions.

2. The lid material according to claim 1, wherein the base material layer is white.

3. The lid material according to claim 1 or 2, wherein the lid material is provided with a surrounding portion on one side of the base material layer that continuously or intermittently surrounds the code printing portion, and the height of the surrounding portion is 50 to 160% of the height of the code printing portion.

4. The lid material according to claim 1 or 2, wherein the lid material further comprises an overcoat layer covering the code printing portion on one side of the base material layer.

5. CIE1976L ＊ a ＊ b ＊ In the color space, the lightness L of one surface of the substrate layer ＊ The lid material according to claim 1 or 2, wherein the value is 80 to 99.

6. CIE1976L ＊ a ＊ b ＊ In the color space, the brightness L of the code printing area. ＊ The lid material according to claim 1 or 2, wherein the value is 0.01 to 45.

7. The lid material according to claim 1 or 2, wherein the base layer comprises one or more selected from the group consisting of ethylene polymers, propylene polymers, and polyethylene terephthalate.

8. The lid material according to claim 1 or 2, wherein the base layer includes a biomass-derived resin or a biodegradable resin as at least one of the following: the olefin polymer, the polyester, and another resin that does not fall under either the olefin polymer or the polyester.

9. The lid material according to claim 1 or 2, wherein the lid material does not include a layer containing aluminum as the main component.

10. A blister pack packaging comprising a lid material and a bottom material as described in claim 1 or 2, with a seal.

11. The blister pack packaging according to claim 10, wherein the bottom material contains the same type of resin as the olefin polymer or polyester.

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