Laminated film and package

Abstract

This laminated film includes a functional layer and a sealant layer as one outermost layer. The functional layer includes a plate-shaped filler and a cyclic olefin copolymer. The sealant layer includes polypropylene-based resin.

Description

Laminated film and packaging

[0001] This application claims priority from Japanese Patent Application No. 2024-015675, filed February 5, 2024, the contents of which are incorporated herein by reference.

[0002] Traditionally, so-called press-through pack (hereinafter referred to as PTP) packaging has been used for packaging pharmaceuticals, food, etc., in which the contents are placed in a pocket formed by molding a plastic sheet, and then heat-sealed with a lid made of aluminum foil coated with an adhesive. Polyvinyl chloride resin has primarily been used as the plastic sheet due to its transparency, formability, rigidity, and cost. However, when the contents are hygroscopic, polyvinyl chloride resin has poor moisture-proofing properties. Therefore, polyvinylidene chloride resin, which has excellent moisture-proofing properties, has been used to address this issue, but these have been expensive and have been problematic in terms of cost.

[0003] In recent years, environmental concerns have led to a lack of use of polyvinyl chloride resins and polyvinylidene chloride resins due to the generation of chlorine-containing gases during incineration. Meanwhile, with recent improvements in molding machines, polypropylene sheets, which were previously difficult to mold, have been attracting attention for their moisture resistance, low cost, and ease of processing, and are now being used for a variety of applications, including press-through packaging. In recent years, there has been a demand for sheets with high reliability and water vapor barrier properties to accelerate the development of moisture-sensitive pharmaceuticals and new drugs. In such cases, a method of improving water vapor barrier properties by adding petroleum resins to polypropylene resins has been implemented (e.g., Patent Document 1). Meanwhile, methods have also been implemented using high-density polyethylene resins and cyclic olefin resins, which are considered to have high water vapor barrier properties among polyolefin resins (e.g., Patent Document 2).

[0004] Japanese Patent Publication No. 59-143613 Publication No. 6-84063

[0005] However, when a petroleum resin is added to a polypropylene resin, although the transparency and moldability after molding are good, the water vapor barrier property is insufficient compared to a laminate sheet obtained by coating a polyvinylidene chloride resin on a polyvinyl chloride resin sheet. Furthermore, when a high-density polyethylene resin or a cyclic olefin resin is used, the water vapor barrier property is improved, but is only at the same level as a laminate sheet obtained by coating a polyvinylidene chloride resin. Furthermore, compared to a laminate sheet laminated with polychlorotrifluoroethylene, a high-barrier resin, the water vapor barrier property is insufficient, so there has been a demand for a packaging sheet that is inexpensive and has even better barrier properties.

[0006] Furthermore, when a cyclic olefin resin is used, there is a problem that the sealing property and impact resistance are insufficient compared to a laminated sheet in which polychlorotrifluoroethylene is laminated to a polyvinyl chloride resin.

[0007] The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a laminated film that is excellent in moisture resistance, low cost, and ease of processing, as well as in sealing properties and impact resistance, and a package using the laminated film.

[0008] In order to solve the above problems, the present invention employs the following configurations. [1]. A laminate film comprising a functional layer and a sealant layer as one of the outermost layers, wherein the functional layer contains a flake-like filler and a cyclic olefin copolymer, and the sealant layer contains a polypropylene-based resin. [2]. The laminate film according to [1], wherein the sealant layer further contains a cyclic olefin copolymer. [3]. The laminate film according to [1] or [2], wherein the functional layer further contains a pigment. [4]. The laminate film according to [3], wherein the pigment is titanium oxide. [5]. The laminate film according to any one of [1] to [4], wherein the flake-like filler is talc. [6]. The laminate film according to any one of [1] to [5], wherein the laminate film further comprises an outer layer as the other outermost layer, and wherein the outer layer contains a polypropylene-based resin. [7]. The laminate film according to [6], wherein the outer layer further contains a cyclic olefin copolymer. [8]. The laminate film according to any one of [1] to [7], wherein the laminate film is a laminate film for a blister pack packaging. [9]. A packaging body constructed using the laminate film according to any one of [1] to [8].

[0009] According to the present invention, there are provided a laminated film that is excellent in moisture resistance, low cost, and ease of processing, as well as excellent in sealability and impact resistance, and a package using the laminated film.

[0010] 1 is a cross-sectional view schematically showing an example of a laminated film according to an embodiment of the present invention. 2 is a perspective view schematically showing an example of a packaging body according to an embodiment of the present invention. 3 is a cross-sectional view taken along line II of the packaging body shown in FIG.

[0011] <<Laminated Film>> A laminated film according to one embodiment of the present invention is a laminated film comprising a functional layer and a sealant layer as one of the outermost layers, wherein the functional layer contains a plate-like filler and a cyclic olefin copolymer, and the sealant layer contains a polypropylene-based resin.

[0012] The present invention will be described in detail below with reference to the drawings. In the drawings used in the following description, for the sake of convenience, the essential parts may be shown enlarged in order to make the features of the present invention easier to understand, and the dimensional proportions of the components may not necessarily be the same as in reality.

[0013] FIG. 1 is a cross-sectional view schematically illustrating an example of the laminated film of the present embodiment.

[0014] The laminated film 1 shown here is constructed by laminating a sealant layer 11, a functional layer 12, and an outer layer 13 in this order in the thickness direction. Each layer will be described below.

[0015] <Sealant Layer> The laminate film of the present embodiment has a sealant layer (for example, sealant layer 11 in the laminate film 1 shown in FIG. 1 ). Providing the sealant layer in the laminate film can improve the moisture resistance, sealing property, and impact resistance of the laminate film or a package formed using the laminate film.

[0016] The sealant layer is one of the outermost layers of the laminate film, and is disposed on one of the outermost layers in the stacking direction of the layers constituting the laminate film. A package can be constructed by sealing the laminate film to another film or sheet using the sealant layer therein. The exposed surface of the sealant layer (the surface opposite to the functional layer side) is the sealing surface for heat sealing to another film or sheet. The sealant layer is preferably transparent.

[0017] The sealant layer contains a polypropylene-based resin. By including a polypropylene-based resin in the sealant layer, the sealant layer can have improved sealing properties and impact resistance. The sealant layer may be a non-easy peel type sealant layer (complete seal type sealant layer) or an easy peel type sealant layer (easy peel layer), but is preferably a non-easy peel type sealant layer (complete seal type sealant layer).

[0018] The polypropylene-based resin contained in the sealant layer is not particularly limited as long as it has a structural unit derived from propylene, and may be a propylene homopolymer or a propylene-based copolymer having a structural unit derived from propylene and a structural unit derived from a monomer other than propylene.

[0019] An example of a homopolymer of propylene is polypropylene (homopolypropylene, hPP).

[0020] A propylene-based copolymer has structural units derived from propylene and structural units derived from a monomer other than propylene. However, among olefin copolymers having structural units derived from propylene and structural units derived from ethylene, copolymers in which the number of structural units derived from ethylene is greater than the number of structural units derived from propylene are classified as ethylene-based copolymers.

[0021] Examples of propylene copolymers include propylene-ethylene random copolymers (also known as polypropylene random copolymers (rPP)), propylene-ethylene block copolymers (also known as polypropylene block copolymers (bPP)), and ethylene-propylene terpolymers (also known as ethylene propylene terpolymers, EPT).

[0022] The sealant layer may contain only one type of polypropylene resin, or two or more types. When two or more types are contained, the combination and ratio thereof can be selected arbitrarily depending on the purpose.

[0023] In the sealant layer, the ratio of the content (parts by mass) of the polypropylene-based resin to the total mass (parts by mass) of the sealant layer ([content (parts by mass) of the polypropylene-based resin in the sealant layer] / [total mass (parts by mass) of the sealant layer]×100) is preferably 10% by mass or more, more preferably 20% by mass or more, and even more preferably 30% by mass or more, and may be, for example, 40% by mass or more or 50% by mass or more. When this ratio is equal to or greater than the lower limit, the sealing property and impact resistance of the sealant layer can be further improved. On the other hand, this ratio is 90% by mass or less. This ratio is usually the same as the ratio of the content (parts by mass) of the polypropylene-based resin to the total content (parts by mass) of components that do not vaporize at room temperature in the resin composition for forming a sealant layer, which will be described later ([content (parts by mass) of the polypropylene-based resin in the resin composition for forming a sealant layer]) / [total content (parts by mass) of components that do not vaporize at room temperature in the resin composition for forming a sealant layer]×100).

[0024] In this specification, "room temperature" means a temperature that is neither particularly cold nor hot, that is, an ordinary temperature, and examples thereof include temperatures of 15 to 25°C.

[0025] The sealant layer may further contain a cyclic olefin copolymer, which can further improve the moisture resistance of the sealant layer.

[0026] From the viewpoint of formability into a packaging body, the cyclic olefin copolymer is preferably a copolymer of a cyclic olefin monomer and an olefin other than the above-mentioned cyclic olefin monomer. The ratio of the cyclic olefin monomer in the cyclic olefin copolymer is preferably 50% by mass or more and 80% by mass or less, more preferably 60% by mass or more and 70% by mass or less.

[0027] The cyclic olefin monomer may be one or more selected from the group consisting of norbornene, derivatives of norbornene, addition products of dicyclopentadiene and ethylene, and addition products of derivatives of dicyclopentadiene and ethylene. The olefin may be one or more selected from the group consisting of ethylene, propylene, and butadiene.

[0028] The cyclic olefin copolymer may be a copolymer of an addition reaction product of cyclopentadiene or a derivative thereof with norbornene or a derivative thereof and one or more unsaturated monomers selected from ethylene, butadiene, or styrene derivatives, or a hydrogenated product thereof.

[0029] The cyclic olefin copolymer may be a copolymer of an addition reaction product of dicyclopentadiene or a derivative thereof with ethylene and one or more unsaturated monomers selected from ethylene, butadiene or styrene derivatives, or a hydrogenated product thereof.

[0030] The cyclic olefin copolymer preferably has a glass transition temperature of 140° C. or lower, more preferably 100° C. or lower, and even more preferably 90° C. or lower. When the glass transition temperature is within the above range, dimensional variation in a package formed using the laminate film can be further reduced, and the barrier properties of the package can be further improved.

[0031] The cyclic olefin copolymer preferably has an MFR (melt flow rate) of 0.2 g / 10 min or more and 12 g / 10 min or less. When the MFR is within this range, melt extrudability can be further improved.

[0032] In this specification, unless otherwise specified, "MFR" refers to a value measured in accordance with JIS K 6922-1.

[0033] When the sealant layer contains the cyclic olefin copolymer, the ratio of the content (parts by mass) of the cyclic olefin copolymer to the total mass (parts by mass) of the sealant layer ([content (parts by mass) of the cyclic olefin copolymer in the sealant layer] / [total mass (parts by mass) of the sealant layer]×100) is preferably 10% by mass or more, more preferably 20% by mass or more, and even more preferably 30% by mass or more, and may be, for example, 40% by mass or more or 50% by mass or more. When the ratio is equal to or greater than the lower limit, the moisture resistance of the sealant layer can be further improved. On the other hand, the ratio is 90% by mass or less. The ratio is usually the same as the ratio of the content (parts by mass) of the cyclic olefin copolymer to the total content (parts by mass) of components that do not vaporize at room temperature in the resin composition for forming a sealant layer, which will be described later ([content (parts by mass) of the cyclic olefin copolymer in the resin composition for forming a sealant layer]) / [total content (parts by mass) of components that do not vaporize at room temperature in the resin composition for forming a sealant layer] × 100. When the sealant layer and the composition for forming a sealant layer do not contain the cyclic olefin copolymer, the content of the cyclic olefin copolymer in the sealant layer and the composition for forming a sealant layer is 0 part by mass.

[0034] The sealant layer may contain, for example, only the polypropylene-based resin, or only the polypropylene-based resin and the cyclic olefin copolymer (i.e., it may consist of the polypropylene-based resin, or the polypropylene-based resin and the cyclic olefin copolymer). Alternatively, it may contain the polypropylene-based resin, or the polypropylene-based resin and the cyclic olefin copolymer, and components other than these (sometimes referred to herein as "other components") (i.e., it may consist of the polypropylene-based resin and the other components, or the polypropylene-based resin, the cyclic olefin copolymer, and the other components).

[0035] The other components that the sealant layer may contain are not particularly limited and may be selected arbitrarily depending on the purpose, and may be, for example, either a resin component (sometimes referred to as "other resin components" in this specification) or a non-resin component (sometimes referred to as "other non-resin components" in this specification).

[0036] The other resin component is not particularly limited as long as it is a resin other than the polypropylene resin and the cyclic olefin copolymer.

[0037] Examples of the other non-resin components include additives known in the art, such as pigments, antifogging agents, antiblocking agents, antioxidants, antistatic agents, crystal nucleating agents, inorganic particles, viscosity reducers, thickeners, heat stabilizers, lubricants, infrared absorbers, and ultraviolet absorbers.

[0038] The sealant layer may contain only one type of other component, or two or more types. When two or more types are contained, the combination and ratio thereof can be selected arbitrarily depending on the purpose.

[0039] The sealant layer may consist of one layer (single layer) or two or more layers. When the sealant layer consists of multiple layers, these multiple layers may be the same or different from each other, and the combination of these multiple layers is not particularly limited as long as it does not impair the effects of the present invention.

[0040] In this specification, not limited to the case of a sealant layer, "multiple layers may be the same or different" means "all layers may be the same, all layers may be different, or only some layers may be the same," and further, "multiple layers are different" means "at least one of the constituent materials and thicknesses of each layer is different from each other."

[0041] The thickness of the sealant layer is preferably 1 μm or more and 50 μm or less, more preferably 5 μm or more and 45 μm or less, and even more preferably 10 μm or more and 40 μm or less. When the thickness is equal to or greater than the lower limit, the moisture resistance, sealing property, and impact resistance of the sealant layer can be further improved. When the thickness is equal to or less than the upper limit, the sealant layer is further prevented from becoming excessively thick. Here, the "thickness of the sealant layer" means the thickness of the entire sealant layer. For example, the thickness of a sealant layer consisting of multiple layers means the total thickness of all layers that make up the sealant layer.

[0042] The ratio of the thickness of the sealant layer to the thickness of the laminated film is preferably 1% or more and 20% or less, more preferably 2% or more and 15% or less, and even more preferably 3% or more and 10% or less. When this ratio is equal to or greater than the lower limit, the moisture resistance, sealing property, and impact resistance of the sealant layer can be further improved. When this ratio is equal to or less than the upper limit, the sealant layer is further prevented from becoming excessively thick.

[0043] <Functional Layer> The laminate film of the present embodiment includes a functional layer (for example, functional layer 12 in the laminate film 1 shown in FIG. 1 ). By including a functional layer in the laminate film, it is possible to improve the moisture resistance of the laminate film or a package formed using the laminate film.

[0044] The functional layer is disposed between the sealant layer and the outer layer in the laminated film, and is preferably transparent.

[0045] The functional layer contains a plate-like filler. When the functional layer contains the filler, the filler inhibits water vapor from passing through the functional layer, reducing the amount of water vapor that passes through the functional layer. Furthermore, since the filler is plate-like, it has a larger flat surface than fillers of other shapes, which increases the water vapor blocking ability. In this way, the moisture resistance of the functional layer can be improved.

[0046] The plate-like filler is not particularly limited, but preferably has an aspect ratio of 5 to 2000, more preferably 10 to 1000, and even more preferably 15 to 500. By setting the aspect ratio to the lower limit or more, the flat surfaces of the filler become sufficiently wide, thereby further improving the moisture resistance of the laminated film. Furthermore, by setting the aspect ratio to the upper limit or less, the dispersibility of the plate-like filler in the functional layer can be further improved.

[0047] The average particle size of the plate-like filler is not particularly limited, but is preferably 0.1 μm or more and 50 μm or less, and more preferably 1 μm or more and 30 μm or less. By setting the average particle size to be equal to or greater than the lower limit, the moisture resistance of the functional layer can be further improved. By setting the average particle size to be equal to or less than the upper limit, the transparency of the functional layer can be further improved.

[0048] In this specification, the term "average particle size", not limited to the case of a plate-like filler, means, unless otherwise specified, the particle size at 50% accumulation of particles (D50) when the particle size distribution of particles is measured on a volume basis by a laser diffraction particle size distribution measurement method.

[0049] Examples of the constituent material of the platy filler include organic materials and inorganic materials, and among these, inorganic materials are preferred. By using an inorganic material as the constituent material of the platy filler, the heat resistance and dimensional stability of the functional layer can be further improved. Examples of organic materials include wood flour, pulp, ground cloth, and cured thermosetting resin powder, and examples of inorganic materials include talc, mica, clay, montmorillonite, silica, etc., and multiple materials may be used in combination. Among these, talc is preferred. Talc has high dispersibility in the functional layer and can further improve the moisture resistance of the functional layer.

[0050] The plate-like filler particles are preferably arranged in a direction parallel to the surface of the functional layer, which more effectively prevents water vapor from penetrating the functional layer in the thickness direction of the functional layer, thereby further improving the moisture resistance of the functional layer.

[0051] In the functional layer, the content of the flake filler relative to the total mass of the functional layer is preferably 1% by mass or more and 50% by mass or less, more preferably 10% by mass or more and 45% by mass or less, and even more preferably 20% by mass or more and 40% by mass or less. By setting this ratio to be equal to or greater than the lower limit, the moisture resistance of the functional layer can be further improved. By setting this ratio to be equal to or less than the upper limit, the transparency and moldability of the functional layer can be further improved.

[0052] The functional layer further contains a cyclic olefin copolymer, which can improve the moisture resistance of the functional layer.

[0053] The cyclic olefin copolymer contained in the functional layer may be the same as the cyclic olefin copolymer contained in the sealant layer described above. The cyclic olefin copolymer contained in the functional layer and the cyclic olefin copolymer contained in the sealant layer may be the same or different from each other.

[0054] In the functional layer, the ratio of the content (parts by mass) of the cyclic olefin copolymer to the total mass (parts by mass) of the functional layer ([content (parts by mass) of the cyclic olefin copolymer in the functional layer] / [total mass (parts by mass) of the functional layer] × 100) is preferably 20% by mass or more, more preferably 30% by mass or more, and even more preferably 40% by mass or more, and may be, for example, 50% by mass or more or 60% by mass or more. When this ratio is equal to or greater than the lower limit, the moisture resistance of the functional layer can be further improved. On the other hand, this ratio is 99% by mass or less. This ratio is usually the same as the ratio of the content (parts by mass) of the cyclic olefin copolymer to the total content (parts by mass) of components that do not vaporize at room temperature in the resin composition for forming a functional layer, which will be described later ([content (parts by mass) of the cyclic olefin copolymer in the resin composition for forming a functional layer]) / [total content (parts by mass) of components that do not vaporize at room temperature in the resin composition for forming a functional layer] × 100).

[0055] The functional layer may, for example, contain only the flake-like filler and the cyclic olefin copolymer (i.e., may consist of the flake-like filler and the cyclic olefin copolymer), or may contain the flake-like filler, the cyclic olefin copolymer, and components other than these (sometimes referred to as "other components" in this specification) (i.e., may consist of the flake-like filler, the cyclic olefin copolymer, and the other components).

[0056] The other components that the functional layer may contain are not particularly limited and can be selected arbitrarily depending on the purpose, and may be, for example, either a resin component (sometimes referred to as "other resin components" in this specification) or a non-resin component (sometimes referred to as "other non-resin components" in this specification).

[0057] The other resin component is not particularly limited as long as it is a resin component other than the cyclic olefin copolymer.

[0058] The other non-resin components are not particularly limited as long as they are non-resin components other than the flake-like filler, and include additives known in the art. Examples of the additives include pigments, antifogging agents, antiblocking agents, antioxidants, antistatic agents, crystal nucleating agents, inorganic particles, viscosity reducers, thickeners, heat stabilizers, lubricants, infrared absorbers, and ultraviolet absorbers. Among these, pigments are preferred.

[0059] The pigment contained in the functional layer is a component for adjusting the color of the functional layer. For example, if the functional layer contains a plate-like filler such as talc, the functional layer may become light brown, which may lead to children mistaking the laminated film for confectionery or the like. Therefore, if the functional layer further contains a white pigment such as titanium oxide, the color of the functional layer becomes white, thereby preventing children from mistaking it for confectionery or the like.

[0060] The pigment contained in the functional layer may be a known one. Examples of the pigment include titanium oxide, zinc oxide, white lead, etc. Among these, titanium oxide is preferred from the viewpoint of making the color of the functional layer white, as described above.

[0061] In the functional layer, the content of the pigment relative to the total mass of the functional layer is preferably 0.1% by mass or more and 10% by mass or less, more preferably 0.5% by mass or more and 8% by mass or less, and even more preferably 1% by mass or more and 6% by mass or less. By setting this content to be equal to or greater than the lower limit, the color of the functional layer can be more easily adjusted. By setting this content to be equal to or less than the upper limit, excessive use of the pigment can be further suppressed.

[0062] The functional layer may contain only one type of other component, or two or more types. When two or more types are contained, the combination and ratio thereof can be selected arbitrarily depending on the purpose.

[0063] The functional layer may consist of one layer (single layer) or two or more layers. When the functional layer consists of multiple layers, these multiple layers may be the same or different from each other, and the combination of these multiple layers is not particularly limited as long as it does not impair the effects of the present invention.

[0064] The thickness of the functional layer is preferably 150 μm or more and 450 μm or less, more preferably 200 μm or more and 400 μm or less, and even more preferably 250 μm or more and 350 μm or less. When the thickness is equal to or greater than the lower limit, the moisture resistance of the functional layer can be further improved. When the thickness is equal to or less than the upper limit, the functional layer is further prevented from becoming excessively thick. Here, the "thickness of the functional layer" means the thickness of the entire functional layer. For example, the thickness of a functional layer consisting of multiple layers means the total thickness of all layers that make up the functional layer.

[0065] The ratio of the thickness of the functional layer to the thickness of the laminated film is preferably 50% to 99%, more preferably 60% to 97%, and even more preferably 70% to 95%. When the ratio is equal to or greater than the lower limit, the moisture resistance of the functional layer can be further improved. When the ratio is equal to or less than the upper limit, the functional layer is further prevented from becoming excessively thick.

[0066] <Outer layer> The laminate film of the present embodiment preferably has an outer layer (outer layer 13 in the laminate film 1 shown in FIG. 1 ). Providing an outer layer in the laminate film can further improve the moisture resistance and impact resistance of the laminate film or a package formed using the laminate film.

[0067] In a laminate film having a sealant layer, a functional layer, and an outer layer, the outer layer is disposed on the opposite side of the functional layer from the sealant layer side. In a laminate film having an outer layer, the outer layer is preferably the other outermost layer, and is preferably disposed on the other outermost side opposite the sealant layer side in the stacking direction of the layers constituting the laminate film. In other words, the surface of the outer layer opposite the sealant layer side is preferably the exposed surface in the multilayer film. The outer layer is preferably transparent.

[0068] The outer layer may contain a polypropylene-based resin. Examples of the polypropylene-based resin contained in the outer layer include the same polypropylene-based resins as those contained in the sealant layer described above. The polypropylene-based resins contained in the outer layer and the sealant layer may be the same or different from each other.

[0069] In the outer layer, the ratio of the content (parts by mass) of the polypropylene-based resin to the total mass (parts by mass) of the outer layer ([content (parts by mass) of the polypropylene-based resin in the outer layer] / [total mass (parts by mass) of the outer layer]×100) is preferably 1% by mass or more, more preferably 10% by mass or more, and even more preferably 20% by mass or more, and may be, for example, 30% by mass or more or 40% by mass or more. When the ratio is equal to or greater than the lower limit, the impact resistance of the outer layer can be further improved. On the other hand, the ratio is 99% by mass or less. The ratio is usually the same as the ratio of the content (parts by mass) of the polypropylene-based resin to the total content (parts by mass) of components that do not vaporize at room temperature in the resin composition for forming the outer layer, which will be described later ([content (parts by mass) of the polypropylene-based resin in the resin composition for forming the outer layer]) / [total content (parts by mass) of components that do not vaporize at room temperature in the resin composition for forming the outer layer]×100).

[0070] The outer layer may further contain a cyclic olefin copolymer. Examples of the cyclic olefin copolymer contained in the outer layer include the same cyclic olefin copolymers as those contained in the sealant layer described above. The cyclic olefin copolymers contained in the outer layer and the cyclic olefin copolymers contained in the sealant layer may be the same or different from each other.

[0071] When the outer layer contains the cyclic olefin copolymer, the ratio of the content (parts by mass) of the cyclic olefin copolymer in the outer layer to the total mass (parts by mass) of the outer layer ([content (parts by mass) of the cyclic olefin copolymer in the outer layer] / [total mass (parts by mass) of the outer layer]×100) is preferably 1% by mass or more, more preferably 10% by mass or more, and even more preferably 20% by mass or more, and may be, for example, 30% by mass or more or 40% by mass or more. When the ratio is equal to or greater than the lower limit, the moisture resistance of the outer layer can be further improved. On the other hand, the ratio is 99% by mass or less. The ratio is usually the same as the ratio of the content (parts by mass) of the cyclic olefin copolymer to the total content (parts by mass) of components that do not vaporize at room temperature in the resin composition for forming the outer layer, which will be described later ([content (parts by mass) of the cyclic olefin copolymer in the resin composition for forming the outer layer] / [total content (parts by mass) of components that do not vaporize at room temperature in the resin composition for forming the outer layer]×100). When the outer layer and the composition for forming an outer layer do not contain the cyclic olefin copolymer, the content of the cyclic olefin copolymer in the outer layer and the composition for forming an outer layer is 0 part by mass.

[0072] The outer layer may contain, for example, only the polypropylene-based resin, or only the polypropylene-based resin and the cyclic olefin copolymer (i.e., it may consist of the polypropylene-based resin, or the polypropylene-based resin and the cyclic olefin copolymer). Alternatively, it may contain the polypropylene-based resin, or the polypropylene-based resin and the cyclic olefin copolymer, and components other than these (sometimes referred to herein as "other components") (i.e., it may consist of the polypropylene-based resin and the other components, or the polypropylene-based resin, the cyclic olefin copolymer, and the other components).

[0073] The other components contained in the outer layer include the same components as those contained in the sealant layer described above.

[0074] The outer layer may consist of one layer (single layer) or two or more layers. When the outer layer consists of multiple layers, these multiple layers may be the same or different from each other, and the combination of these multiple layers is not particularly limited as long as it does not impair the effects of the present invention.

[0075] In this specification, not only in the case of the outer layer, "multiple layers may be the same or different from one another" means "all layers may be the same, all layers may be different, or only some layers may be the same," and further, "multiple layers are different from one another" means "at least one of the constituent materials and thicknesses of each layer is different from one another."

[0076] The thickness of the outer layer is preferably 1 μm or more and 50 μm or less, more preferably 5 μm or more and 45 μm or less, and even more preferably 10 μm or more and 40 μm or less. When the thickness is equal to or greater than the lower limit, the moisture resistance and impact resistance of the outer layer can be further improved. When the thickness is equal to or less than the upper limit, the outer layer is further prevented from becoming excessively thick. Here, the "thickness of the outer layer" means the thickness of the entire outer layer. For example, the thickness of an outer layer consisting of multiple layers means the total thickness of all layers that make up the outer layer.

[0077] The ratio of the thickness of the outer layer to the thickness of the laminated film is preferably 1% or more and 20% or less, more preferably 2% or more and 15% or less, and even more preferably 3% or more and 10% or less. When this ratio is equal to or greater than the lower limit, the moisture resistance and impact resistance of the outer layer can be further improved. When this ratio is equal to or less than the upper limit, the outer layer is further prevented from becoming excessively thick.

[0078] <Other Layers> The laminate film may have other layers that do not fall under any of the sealant layer, functional layer, and outer layer, as long as the effects of the present invention are not impaired. The type, number, and position of the other layers provided in the laminate film are not particularly limited and can be selected as desired depending on the purpose. In particular, it is preferable that the other layer is arranged between the sealant layer and the outer layer. For example, the other layer provided in the laminate film may be only one type, or may be two or more types, and if there are two or more types, the combination and ratio thereof can be selected as desired depending on the purpose.

[0079] The other layers may be one layer (single layer) or two or more layers per type. When the other layers are multiple layers, the multiple layers may be the same or different from each other, and the combination of the multiple layers is not particularly limited as long as it does not impair the effects of the present invention.

[0080] The thickness of the other layer can be set arbitrarily depending on the type of the other layer, and is not particularly limited.

[0081] When the laminated film includes the other layer, it may further include an adhesive layer for adhering the other layer to other layers.

[0082] <Characteristics of Laminated Film> Since the laminated film contains a plate-like filler, a cyclic olefin copolymer, a polypropylene-based resin, etc., it is superior in cost reduction and ease of processing compared to films containing halogen-based materials such as chlorine and fluorine.

[0083] In this specification, "ease of processing" means that the laminated film does not contain halogen, and therefore no special equipment for processing halogen is required.

[0084] The thickness of the laminate film is preferably 150 μm or more and 450 μm or less, more preferably 200 μm or more and 400 μm or less, and even more preferably 250 μm or more and 350 μm or less. When the thickness of the laminate film is equal to or more than the lower limit, the moisture resistance, sealing property, and impact resistance of the laminate film can be further improved. When the thickness of the laminate film is equal to or less than the upper limit, the tablet storage section of the package can be more easily formed.

[0085] The laminated film is suitable as a laminated film for blister pack packaging.

[0086] [Sheet moisture permeability] The sheet moisture permeability of the laminated film measured in accordance with JIS K7129 (Method B) was 0.27 g / m ２ day or less, and 0.25 g / m ２ More preferably, it is 0.23 g / m or less. ２ On the other hand, the sheet moisture permeability of the laminated film is 0 g / m or less. ２ That is, the oxygen permeability of the laminated film is 0 to 0.27 g / m ２ ・day, 0-0.25g / m ２ day, and 0 to 0.23 g / m ２ ・It may be either day.

[0087] The sheet moisture permeability of the laminated film can be obtained, for example, by measuring the amount of water vapor permeating through the laminated film, as in the examples described later.

[0088] The water vapor permeability of a laminate film can be adjusted by adjusting the type, amount, or thickness of the components contained in any of the layers constituting the laminate film. For example, the water vapor permeability of the laminate film can be easily reduced by adjusting the type and content of the flake filler and cyclic olefin copolymer in the functional layer of the laminate film. However, this is just one example, and the water vapor permeability of the laminate film can also be adjusted by adjusting other layers.

[0089] [Pocket Moisture Permeability] The pocket moisture permeability of the package is preferably 1.2 mg / 10 pockets-day or less, more preferably 1.0 mg / 10 pockets-day or less, and even more preferably 0.8 mg / 10 pockets-day or less. On the other hand, the pocket moisture permeability of the package is 0 pockets-day or more. That is, the pocket moisture permeability of the package may be any of 0 to 1.2 pockets-day, 0 to 1.0 pockets-day, and 0 to 0.8 pockets-day.

[0090] The pocket moisture permeability of the package can be obtained, for example, by measuring the amount of water vapor permeating through the tablet storage section of the package, as in the examples described later.

[0091] The water vapor permeation rate of the tablet storage section of the package can be adjusted by adjusting the type, amount, or thickness of the components contained in any of the layers constituting the laminate film that makes up the package. For example, the water vapor permeation rate of the tablet storage section of the package can be easily reduced by a method similar to that used to reduce the water vapor permeation rate of the laminate film described above. However, this is just one example, and the water vapor permeation rate of the tablet storage section of the package can also be adjusted by adjusting other layers.

[0092] [Molding Temperature Range] The molding temperature range of the laminated film is preferably 8°C or higher, more preferably 12°C or higher, and even more preferably 16°C or higher.

[0093] The forming temperature range of the laminate film can be adjusted by adjusting the type, amount, or thickness of the components contained in any of the layers constituting the laminate film. For example, the forming temperature range of the laminate film can be easily reduced by using a sealant layer and an outer layer containing a polypropylene-based resin. However, this is just one example, and the forming temperature range of the laminate film can also be adjusted by adjusting other layers.

[0094] [Film color] It is preferable that the laminated film is transparent to make it easier to see from the outside of the packaging body made using the laminated film, but if it is not transparent, it is preferable that it is white to prevent children from mistaking the laminated film for sweets, etc.

[0095] The color of the laminate film can be adjusted by adjusting the type, amount, or thickness of the components contained in any of the layers constituting the laminate film. For example, if a plate-like filler such as talc is added to the functional layer of the laminate film, the laminate film may turn light brown, which may lead to children mistaking it for confectionery or the like. Therefore, if a white pigment such as titanium oxide is further added to the functional layer of the laminate film, the color of the laminate film becomes white, preventing children from mistaking it for confectionery or the like. However, this is just one example, and the color of the laminate film can also be adjusted by adjusting other layers.

[0096] [Tablet Removal Shipping Weight] The tablet removal shipping weight of the package is preferably 6N or more and 24N or less, more preferably 8N or more and 22N or less, and even more preferably 10N or more and 20N or less.

[0097] The tablet removal load of the package can be obtained, for example, by vertically pushing the tip of the tablet storage section of the package with a pushing pin and measuring the maximum load applied until the tablet storage section is fully pushed in, as in the examples described below.

[0098] The maximum load applied until the tablet storage portion of the package is sufficiently pressed in can be adjusted by adjusting the type, amount, or thickness of the components contained in any of the layers constituting the laminate film that makes up the package. For example, by making the sealant layer and outer layer of the laminate film layers containing a polypropylene-based resin, the maximum load applied until the tablet storage portion of the package is sufficiently pressed in can be easily reduced. However, this is just one example, and the maximum load applied until the tablet storage portion of the package is sufficiently pressed in can also be adjusted by adjusting other layers.

[0099] [Impact Resistance] The impact resistance of the laminated film can be confirmed by, for example, whether the laminated film does not break when folded in both mountain and valley directions, as in the examples described later.

[0100] The impact resistance of a laminate film can be adjusted by adjusting the type, amount, or thickness of the components contained in any of the layers constituting the laminate film. For example, the impact resistance of the laminate film can be easily adjusted by making the sealant layer and outer layer of the laminate film layers containing polypropylene-based resins. However, this is just one example, and the impact resistance of the laminate film can also be adjusted by adjusting other layers.

[0101] [Sealability] The sealability of the package can be evaluated by, for example, subjecting the package to a water immersion leak test, as in the examples described later.

[0102] The sealability of the package can be adjusted by adjusting the type, amount, or thickness of the components contained in any of the layers constituting the laminate film that constitutes the package. For example, the sealability of the package can be easily adjusted by adjusting the type and content of the polypropylene-based resin in the sealant layer of the laminate film. However, this is just one example, and the sealability of the package can also be adjusted by adjusting other layers.

[0103] [Slit Dividability] The slit divisibility of a package can be evaluated by, for example, forming a slit in the package, folding the slit portion in a mountain fold and a valley fold, and then tearing the slit, as in the examples described later.

[0104] The slit divisibility of the package can be adjusted by adjusting the type, amount or thickness of the components contained in any of the layers constituting the laminated film that constitutes the package.

[0105] <<Method for Producing Laminated Film>> The laminated film can be produced, for example, by a feed block method in which resins or resin compositions, etc., which are materials for forming each layer, are melt-extruded using several extruders; a coextrusion T-die method such as a multi-manifold method; an air-cooled or water-cooled coextrusion inflation method; or the like.

[0106] The laminated film can also be produced by coating the surface of another layer that will form one of the layers with a resin or resin composition, etc., and drying it as needed to form a laminated structure in the laminated film, and then, as needed, further laminating other layers so as to form the desired arrangement.

[0107] Alternatively, the laminate film can be produced by separately preparing two or more films for forming two or more of the layers, laminating them together using an adhesive by dry lamination, extrusion lamination, hot melt lamination, or wet lamination, and then laminating other layers as needed to form the desired configuration. In this case, an adhesive capable of forming the adhesive layer may be used. For example, a laminate film having an outer layer may be produced by laminating a laminate film having a sealant layer with an outer layer or a laminate film having an outer layer by any of the methods described above. The outer layer before lamination may be biaxially stretched as needed.

[0108] The laminated film can also be produced by laminating two or more films, which have been separately prepared in advance, by thermal lamination or the like without using an adhesive, and then laminating other layers as necessary to achieve the desired arrangement. For example, a laminated film having a sealant layer and an outer layer or a laminated film having an outer layer may be laminated together without using an adhesive, unlike the above.

[0109] When producing the laminated film, two or more of the above-mentioned methods for forming any of the layers in the laminated film (in other words, the film) may be combined.

[0110] The resin composition used as a material for forming any layer in the laminated film may be produced by adjusting the types and contents of the components contained therein so that the layer to be formed contains the desired components in the desired amounts. For example, the ratio of the contents of the components that do not vaporize at room temperature in the resin composition is usually the same as the ratio of the contents of the components in the layer formed from this resin composition.

[0111] Examples of resin compositions (sometimes referred to herein as "sealant layer-forming compositions") for forming a sealant layer (for example, sealant layer 11 in the laminate film 1 shown in FIG. 1) include resin compositions containing the polypropylene resin, the cyclic olefin copolymer, and, if necessary, the other components.

[0112] Examples of resin compositions (sometimes referred to in this specification as "compositions for forming functional layers") for forming functional layers (for example, functional layer 12 in the laminate film 1 shown in Figure 1) include resin compositions containing the plate-like filler, the cyclic olefin copolymer, the pigment, and, if necessary, the other components.

[0113] Examples of the resin composition (sometimes referred to in this specification as an "outer layer forming composition") for forming an outer layer (for example, outer layer 13 in the laminate film 1 shown in FIG. 1) include resin compositions containing the polypropylene resin, the cyclic olefin copolymer, and, if necessary, the other components.

[0114] <<Packaging>> A packaging according to one embodiment of the present invention is constructed using the laminate film of the present invention. Because the packaging according to this embodiment uses the laminate film of the present invention, it has excellent moisture resistance, low cost, and ease of processing, as well as excellent sealability and impact resistance.

[0115] The packaging of the present invention is suitable for use in various applications requiring moisture resistance, low cost, easy processing, as well as sealability and impact resistance. For example, it is suitable as a packaging or packaging container for packaging food, medicines, etc., and is more preferably for packaging pharmaceuticals.

[0116] Fig. 2 is a perspective view schematically showing one embodiment of the package of the present invention, and Fig. 3 is a cross-sectional view of the package shown in Fig. 2 taken along line II. In Fig. 2 and subsequent figures, the same components as those shown in figures already described are designated by the same reference numerals as in those figures, and detailed description thereof will be omitted.

[0117] The package 10 shown here is configured to include a molded film 2 and a cover film 101. The molded film 2 is formed with a protruding portion 2c that constitutes the storage portion 10a of the package 10. The molded film 2 is a molded product of the above-mentioned laminated film (for example, the laminated film 1 shown in FIG. 1). The package 10 is a PTP (press-through package) film (packaging container) serving as a blister pack, and the storage portion 10a can hermetically store tablets 102.

[0118] One surface (sometimes referred to herein as the "second surface") 2b of the molding film 2 is adhered to one surface (sometimes referred to herein as the "first surface") 101a of the cover film 101. However, the molding film 2 protrudes in a partial area toward the other surface (sometimes referred to herein as the "first surface") 2a, and the second surface 2b of this protruding portion 2c is not adhered to the first surface 101a of the cover film 101, and the second surface 2b of the molding film 2 and the first surface 101a of the cover film 101 form the storage section 10a.

[0119] The cover film 101 may be made of, for example, aluminum.

[0120] A slit 10b is formed in the molding film 2 and the cover film 101. The slit 10b is an optional configuration and does not necessarily have to be formed, but by forming the slit 10b, the package 10 can be easily divided into specific numbers of tablets 102 to be accommodated in the storage sections 10a, thereby improving the convenience of the package 10.

[0121] Here, the packaging body 10 is shown as one in which the outer shape of the storage section 10a is a truncated cone, but the outer shape of the storage section 10a is not limited to this and can be selected arbitrarily depending on the shape of the tablets 102 to be stored. For example, when the packaging body 10 is viewed in a plan view looking down from the forming film 2 side, the outer shape of the storage section 10a may be a polygonal shape such as a triangle, a rectangle, a pentagon, or a hexagon, or may be an oval shape.

[0122] Also, here, the packaging body 10 is shown as having eight storage sections 10a, but the number of storage sections 10a is not limited to this, and may be one, or two or more (except when there are eight).

[0123] <<Method for manufacturing package>> The package of this embodiment can be manufactured by using the laminate film and bonding the laminate films together or the laminate film and another film, etc., so as to form the desired storage section.

[0124] For example, the package 10 shown in Fig. 2 can be manufactured using a known PTP packaging machine. More specifically, first, a protrusion is formed in the laminate film 1 by vacuum forming, pressure forming, plug forming, or the like to produce the molded film 2. Next, the protrusion 2c of the molded film 2 is filled with tablets 102 to be stored, and then the cover film 101 is overlapped with the laminated film 1 to bond the molded film 2 and the cover film 101 together. Next, if necessary, a slit 10b is formed in the molded film 2 and the cover film 101 using a perforation blade, a half-cut blade, or the like. In this manner, the package 10 is obtained.

[0125] The present invention will be described in more detail below with reference to specific examples, although the present invention is not limited to the examples shown below.

[0126] Example 1 <<Production of Laminated Film>> A laminated film having the structure shown in FIG. 1 was produced according to the following procedure.

[0127] The resins and additives used in the examples and comparative examples are as follows: PP: Polypropylene resin ("E122V" manufactured by Prime Polymer Co., Ltd.) COC: Cyclic olefin copolymer ("8007F-04" manufactured by Polyplastics Co., Ltd.) TL: Talc (plate-like filler, "Micro Ace L-1" manufactured by Nippon Talc Co., Ltd., aspect ratio: 50, average particle size: 5.0 μm) PG: Titanium oxide (pigment, "PEONY WHITE" manufactured by DIC Corporation)

[0128] The PP (50 parts by mass) and the COC (50 parts by mass) were mixed to produce a resin composition for forming a sealant outer layer.

[0129] The COC (67.2 parts by mass), the TL (28.8 parts by mass), and the PG (4 parts by mass) were mixed together to produce a resin composition for forming a functional layer.

[0130] The die temperature was set to 250°C, and the resin composition for forming the sealant / outer layer, the resin composition for forming the functional layer, and the resin composition for forming the sealant / outer layer were co-extruded in this order (co-extrusion T-die method) to obtain a laminated film (thickness 300 μm) composed of a sealant layer (first layer) (thickness 15 μm), a functional layer (second layer) (thickness 270 μm), and an outer layer (third layer) (thickness 15 μm) laminated in this order in the thickness direction.

[0131] <<Evaluation of Laminated Films>> The films produced in the Examples and Comparative Examples were evaluated for the following items by the methods described below. The results are shown in Table 1.

[0132] <Moisture permeability of sheet> The moisture permeability of the film prepared in each example and comparative example was evaluated by measuring the amount of water vapor transmitted through the film. The amount of water vapor transmitted through the film was measured using a PERMATRAN-W (registered trademark) 3 / 33 manufactured by MOCON in accordance with the method described in JIS K7129 (Method B) (moisture absorption conditions: 40°C / 90%).

[0133] <Pocket moisture permeability> Test specimens were prepared using the films prepared in the Examples and Comparative Examples. Specifically, a roll of film with a width of 100 mm was first prepared. Two rows of tablet storage compartments, each with five tablets per row, protruding in the thickness direction were formed on the film using a PTP packaging machine (manufactured by CKD Corporation, "FBP-300E"). The film was cut to a length of approximately 50 mm to prepare a first test specimen. The tablet storage compartment was a recess with an inner diameter of 10.0 mm and a depth of 4.5 mm.

[0134] The ten tablet storage compartments of the first test piece were each filled with zeolite (φ7.0 mm × 3.0 mm), and the openings of the tablet storage compartments were sealed with aluminum cover films to obtain a second test piece. The second test piece was left in an atmosphere of 40°C and 90% RH for 24 hours, after which the weight change of the zeolite was measured. The pocket moisture permeability was evaluated by obtaining the amount of water vapor transmitted through the tablet storage compartment of the second test piece from this weight change.

[0135] <Molding Temperature Range> The moldability of packages containing the films produced in the Examples and Comparative Examples was evaluated. Specifically, for each of the films in the Examples and Comparative Examples, a total of 10 storage sections (φ10.0 mm × 4.5 mm) were formed using a PTP packaging machine (CKD Corporation's "FBP-300E"), with five storage sections along the longitudinal direction and two storage sections along the lateral direction. The criteria for determining whether or not the film could be molded were that the pocket thickness (thinnest layer) of the film was 80 μm or more, the pocket was free of whitening (a phenomenon in which the pocket side portions are forcibly stretched and become partially white), and the pocket height was 4.5 mm or more. The molding temperature range that satisfied these criteria was measured as the moldable temperature range.

[0136] <Film Color> The films produced in the examples and comparative examples were visually observed and the color of the films was evaluated.

[0137] <Tablet Removal Load> The tablet removal load of the tablet storage section of the first test piece was measured. A cylindrical pusher pin with a diameter of 5 mm was attached to a compression tester, and the tip of the tablet storage section was pushed vertically with the pusher pin under a compression condition of 10 mm / min. The maximum load applied until the tablet storage section was sufficiently pushed in was measured. If the value of the measured maximum load converted per 100 μm was low, the tablet removal property was evaluated as good.

[0138] <Impact Resistance> The impact resistance of the films produced in the Examples and Comparative Examples was evaluated according to the following criteria: [Evaluation Criteria] A: Does not break when folded in both directions. B: Breaks when folded in both directions.

[0139] <Sealing property> A water immersion leak test (pressure inside container: 66.7 kPa, time: 30 seconds) was carried out on the second test piece, and the sealing property was evaluated according to the following criteria. [Evaluation criteria] A: No water seepage into the pocket B: Water seepage into the pocket

[0140] <Slit Dividability> Slits (140 mm deep) were made on the surfaces of the first test piece side and the cover film side of the second test piece using a slit blade, and after manually folding in a mountain direction and a valley direction, the second test piece was torn along the slit line, and the slit divideability was evaluated according to the following criteria. [Evaluation criteria] A: Can be divided without stretching or catching, etc. B: Difficult to divide due to stretching, catching, etc., or cannot be divided.

[0141] Comparative Example 1 A resin film having a single layer structure was produced according to the following procedure.

[0142] The COC (70 parts by mass) and the TL (30 parts by mass) were mixed together to produce a resin composition for forming a resin film.

[0143] The resin composition for forming a resin film was molded into a single layer film to obtain a resin film (first layer) (thickness: 300 μm).

[0144] This resin film was evaluated in the same manner as in Example 1. The results are shown in Table 1.

[0145] Comparative Example 2 A two-layer laminated film was produced according to the following procedure.

[0146] A laminated film (thickness 301 μm) was obtained by laminating a first layer (thickness 51 μm) and a second layer (thickness 250 μm) in the thickness direction using a PCTFE sheet ("Aclar UltRx2000" manufactured by Honeywell) and a PVC sheet ("VSS-F120" manufactured by Sumitomo Bakelite Co., Ltd.) by dry lamination.

[0147] This laminated film was evaluated in the same manner as in Example 1. The results are shown in Table 1.

[0148]

[0149] As is clear from the above results, the laminate film of Example 1 was superior in terms of cost reduction and ease of processing to the laminate film of Comparative Example 2 because none of the layers contained halogen-based materials such as chlorine or fluorine.

[0150] The laminated film of Example 1 has a sheet moisture permeability of 0.20 g / m2 even though none of the layers contains halogen-based materials such as chlorine or fluorine. ２ The moisture permeability of the laminated film of Comparative Example 2 (sheet moisture permeability: 0.15 g / m²) was low at 0.8 mg / 10 pockets per day. ２ ·day, pocket moisture permeability: 0.6 mg / 10 pockets·day).

[0151] The laminated film of Example 1 had a first layer containing polypropylene as one outermost layer and a third layer containing polypropylene as the other outermost layer, and therefore had better impact resistance and sealability than the single-layer film of Comparative Example 1.

[0152] The laminated film of Example 1 had a wide molding temperature range (FBP-300E) of 20°C, which was wider than the monolayer film of Comparative Example 1 (4°C) and the laminated film of Comparative Example 2 (15°C).

[0153] The laminated film of Example 1 contained titanium oxide in the second layer, so the film was white in color, which was a color more suitable for PTP packaging than the single-layer film of Comparative Example 1 (light brown).

[0154] The laminated film of Example 1 had a good tablet removal loading weight of 12 N, exhibiting better tablet removal properties than the single-layer film of Comparative Example 1 (20 N) and similar tablet removal properties to the laminated film of Comparative Example 2 (12 N).

[0155] The laminated film of Example 1, the single layer film of Comparative Example 1, and the laminated film of Comparative Example 2 all had excellent slit divisibility.

[0156] INDUSTRIAL APPLICABILITY The present invention can be used to produce a laminated film that is excellent in moisture resistance, low cost, and ease of processing, as well as excellent in sealability and impact resistance, and to produce a package using the laminated film.

[0157] DESCRIPTION OF SYMBOLS 1... Laminated film 11... Sealant layer 12... Functional layer 13... Outer layer 2... Molded film 2a... First surface of molded film 2b... Second surface of molded film 2c... Protruding portion of molded film 10... Package 10a... Storage portion of package 10b... Slit of package 101... Cover film 101a... First surface of cover film 102... Tablet

Claims

1. A laminated film comprising a functional layer and a sealant layer as one of the outermost layers, the functional layer includes a flake-like filler and a cyclic olefin copolymer, the sealant layer contains one or more polypropylene-based resins selected from the group consisting of homopolypropylene, propylene-ethylene random copolymer, propylene-ethylene block copolymer, and ethylene-propylene terpolymer, the laminated film further includes an outer layer as the other outermost layer, the outer layer contains a polypropylene-based resin, the outer layer further comprises a cyclic olefin copolymer, The laminate film is a laminate film for blister pack packaging.

2. The laminate film according to claim 1 , wherein the sealant layer further comprises a cyclic olefin copolymer.

3. The laminate film according to claim 1 , wherein the functional layer further comprises a pigment.

4. The laminated film according to claim 3 , wherein the pigment is titanium oxide.

5. The laminated film according to claim 1 , wherein the platy filler is talc.

6. A packaging body constructed using the laminated film according to any one of claims 1 to 5.