Tube container and laminate

Abstract

To provide a tube container having a higher antiviral property, and a laminate used for it.SOLUTION: A tube container 1 comprises a body part 2 for storing contents and an injecting part 3 capable of injecting the stored contents. The body part 2 is formed by a laminate 10, and the laminate 10 comprises a base material layer 11, a first sealant layer 12 provided on one surface side of the base material layer 11, a second sealant layer 13 provided on the other surface side of the base material layer 11, and a protective layer 17 provided on a surface opposite to the base material layer 11 of the first sealant layer 12. The protective layer 17 contains a plurality of particles 18 having an antiviral property, and at least some the plurality of particles 18 are exposed from the surface of the protective layer 17.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a tube container and a laminate used therein. [Background technology]

[0002] Tube containers used for storing toothpaste, moisturizing cream, etc. are often stored in humid environments such as around the water in a bathroom, where bacteria and viruses attached to the surface of the container can easily grow. To avoid such problems, a tube container made of a material containing an antibacterial agent has been proposed (for example, see Patent Document 1). The tube container of Patent Document 1 is provided with an antibacterial function by incorporating an inorganic compound having antibacterial properties into the surface resin layer of the laminated material constituting the container. In particular, in recent years, infectious diseases caused by powerful viruses have become prevalent, and it is desired that such tube containers also have higher antiviral properties. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 10-146924 Summary of the Invention [Problem to be solved by the invention]

[0004] In order to solve the above problems, an object of the present invention is to provide a tube container having higher antiviral properties and a laminate used therein. [Means for solving the problem]

[0005] The present invention solves the above problems by the following solving means. Note that, for ease of understanding, the following description will be given with reference numerals corresponding to the embodiments of the present invention, but the present invention is not limited thereto.

[0006] The first invention is a tube container (1) having a body (2) for accommodating contents and a pouring part (3) from which the accommodated contents can be poured out, the body being formed of a laminate (10), the laminate comprising a base layer (11), a first sealant layer (12) provided on one side of the base layer, a second sealant layer (13) provided on the other side of the base layer, and a protective layer (17) provided on the first sealant layer on the side opposite to the base layer, the protective layer containing a plurality of particles (18) having antiviral properties, at least a portion of the plurality of particles being exposed from the surface of the protective layer.

[0007] A second invention is the tube container (1) of the first invention, wherein, when viewed from the surface side of the protective layer (17), the ratio of the total area of ​​the particles exposed from the surface of the protective layer to the area of ​​the surface of the protective layer is 1.5% or more and 10.0% or less.

[0008] A third invention is the tube container (1) of the first or second invention, wherein the weight ratio of the particles (18) contained in the protective layer (17) is 2% or more and 15% or less.

[0009] A fourth invention is a tube container (1) according to any one of the first to third inventions, wherein the average particle size of the particles (18) contained in the protective layer (17) is equal to or greater than the thickness of the protective layer.

[0010] A fifth invention is a tube container (1) according to any one of the first to fourth inventions, wherein the body portion (2) is formed by overlapping and joining one end edge of the laminate (10) to the other end edge, and the protective layer (17) is formed in a manner avoiding an area where the one end edge and the other end edge of the laminate overlap.

[0011] A sixth invention is a tube container (1) according to any one of the first to fourth inventions, wherein the body portion (2) is provided with a joining member (20) that joins one end edge and the other end edge of the laminate (10), and the protective layer (17) is formed to avoid the portions of the laminate where the joining members overlap.

[0012] A seventh invention is the tubular container (1) of any one of the first to sixth inventions, wherein at least a part of the layers constituting the laminate (10) contains a material derived from biomass.

[0013] The eighth invention is a laminate (10) comprising a base layer (11), a first sealant layer (12) provided on one side of the base layer, a second sealant layer (13) provided on the other side of the base layer, and a protective layer (17) provided on the first sealant layer on the side opposite to the base layer, wherein the protective layer contains a plurality of particles (18) having antiviral properties, and at least some of the plurality of particles are exposed from the surface of the protective layer. Effect of the Invention

[0014] According to the present invention, it is possible to provide a tube container having higher antiviral properties and a laminate used therein. [Brief description of the drawings]

[0015] [Figure 1] FIG. 2 is a cross-sectional view of a laminate used in the tube container of the embodiment. [Diagram 2] FIG. 2 is a diagram showing a tube container according to an embodiment. [Diagram 3] FIG. 11 is a cross-sectional view of another example of a laminate used in the tube container of the embodiment. [Figure 4] 4A to 4C are diagrams illustrating a joint portion of a body portion of a tube container according to an embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0016] The tube container and the laminate used therein of the present invention will be described below with reference to the drawings. FIG. 1 is a cross-sectional view of a laminate used in a tube container of this embodiment. FIG. 2 is a diagram showing a tube container of this embodiment. FIG. 3 is a cross-sectional view of another example of the laminate used in the tube container of this embodiment. Note that the figures shown below, including FIG. 1, are schematic diagrams, and the size and shape of each part are appropriately exaggerated to make them easier to understand. Furthermore, the words "sheet" and "film" are generally used in order of thickness, and this specification follows suit. However, since there is no technical meaning behind such distinction, these words can be used interchangeably. Furthermore, the numerical values ​​such as the dimensions of each component and the names of materials described in this specification are merely examples of an embodiment, and are not intended to be limiting, and may be appropriately selected and used.

[0017] In this specification, terms specifying shapes or geometric conditions, such as parallel and orthogonal, are intended to include not only their strict meanings but also states that have a similar optical function and have an error that can be regarded as parallel or orthogonal. In this specification, the sheet surface (film surface) refers to the surface of each sheet (film) that is in the planar direction of the sheet (film) when the sheet (film) is viewed as a whole.

[0018] <Laminate> The laminate 10 is a packaging material applied to a tube container used to store, for example, toothpaste, moisturizing cream, etc. As shown in Fig. 1, the laminate 10 of this embodiment includes a base layer 11, a first sealant layer 12, a second sealant layer 13, a first intermediate layer 14, a second intermediate layer 15, a barrier layer 16, and a protective layer 17. As shown in Fig. 2, in this embodiment, the laminate 10 forms the body 2 of a tube container 1, and the second sealant layer 13, the barrier layer 16, the second intermediate layer 15, the first intermediate layer 14, the base layer 11, the first sealant layer 12, and the protective layer 17 are laminated in this order from the inner surface side of the tube container 1. Each layer constituting the laminate 10 will now be described.

[0019] The base layer 11 is a layer that supports the first sealant layer 12, and may be, for example, a sheet of PET (polyethylene terephthalate) resin. In addition to the above-mentioned PET, the base layer 11 may also be made of OPP (biaxially oriented polypropylene), nylon, or the like. A printed layer (not shown) is provided on the surface of the base layer 11 (the surface on the first sealant layer 12 side), and can display the contents of the tube container 1, instructions for use, and the like.

[0020] The first sealant layer 12 is a layer provided on the outer side of the tube container 1 relative to the base layer 11, and has a heat sealability that has adhesive properties when heated. The first sealant layer 12 is formed to be transparent or nearly transparent so that the printed layer provided on the base layer 11 can be seen. An unstretched polyolefin resin film having heat sealability is preferably used as the resin film constituting the first sealant layer 12. In particular, in the present invention, an unstretched polyethylene-based resin film or an unstretched polypropylene-based resin film can be preferably used.

[0021] Examples of resins constituting the unstretched polyethylene resin film include low-density polyethylene (LDPE), medium-density polyethylene (MDPE), high-density polyethylene (HDPE), linear low-density polyethylene (LLDPE), etc. In addition to these homopolymers, copolymerized polyolefins in which part of the ethylene is replaced with other monomers may also be used.

[0022] Examples of resins constituting the unstretched polypropylene-based resin film (CPP film) include homopolypropylene, random polypropylene, block polypropylene, etc. Copolymer polypropylene in which a part of propylene is replaced with another monomer may also be used.

[0023] The unstretched polyolefin resin film may be a single layer or a multilayer. In the unstretched polyolefin resin film, various plastic compounding agents and additives can be added during film formation, for example, to improve or modify the processability, heat resistance, weather resistance, mechanical properties, dimensional stability, antioxidant properties, slipperiness, release properties, flame retardancy, antifungal properties, electrical properties, strength, and other properties of the film, and the amount of the additives can be arbitrarily added depending on the purpose, ranging from a very small amount to several tens of percent. Examples of common additives include crosslinking agents, antioxidants, ultraviolet absorbers, light stabilizers, fillers, reinforcing agents, antistatic agents, pigments, and modifying resins.

[0024] The unstretched polyolefin resin film can be obtained by known means, such as a method of forming a film from each of the above-mentioned resins alone using a film-forming method such as an extrusion method, a cast molding method, a T-die method, a cutting method, an inflation method, or the like, a method of forming a multilayer film using two or more types of various resins by co-extrusion, or a method of using two or more types of resins and mixing them before forming into a film.

[0025] From the viewpoint of being heat-sealed without gaps by heating, the thickness of the first sealant layer 12 is desirably 50 μm or more and 210 μm or less, and more desirably 100 μm or more and 180 μm or less. If the thickness of the first sealant layer 12 is 50 μm or more, for example, when the laminate 10 is used to produce a tube container 1 (see FIG. 2), sufficient heat seal strength can be maintained in joining the edges of the body 2. Furthermore, by making the thickness of the first sealant layer 12 210 μm or less, the stiffness of the original body roll can be maintained while minimizing the amount of plastic used.

[0026] The second sealant layer 13 is a layer disposed on the innermost side of the tube container 1 in the laminate 10, and has heat sealability, i.e., adhesive properties caused by heating, similar to the first sealant layer 12. The second sealant layer 13 is made of the same material as the first sealant layer 12 described above.

[0027] The first intermediate layer 14 is provided to supplement various functions required for the tube container 1. In this embodiment, the first intermediate layer 14 is provided on the surface of the base layer 11 opposite to the first sealant layer 12, and is provided to improve the design of the tube container 1. In addition, since the tube container 1 contains toothpaste and the like as the contents as described above, the first intermediate layer 14 may have a vapor barrier property that prevents the permeation of water vapor and a gas barrier property that prevents the permeation of gases such as oxygen gas so that the contents can be preserved while preventing deterioration of the contents.

[0028] Examples of the first intermediate layer 14 having such functions include a film obtained by depositing an inorganic material such as aluminum oxide onto a film of polyethylene terephthalate, nylon, polyamide, polyethylene, polypropylene, polyvinyl chloride, polyvinylidene chloride, polycarbonate, polyvinyl alcohol, ethylene-propylene copolymer, saponified ethylene-vinyl acetate copolymer, etc. The thickness of such a first intermediate layer 14 is preferably in the range of 12 μm to 25 μm.

[0029] The second intermediate layer 15 is provided to supplement various functions required for the tube container 1. In this embodiment, the second intermediate layer 15 is provided on the surface of the first intermediate layer 14 opposite to the base material layer 11, and is provided to adjust the total thickness of the laminate 10. In addition, the second intermediate layer 15 in this embodiment is formed of a biomass-derived material, for example, a biomass PE (polyethylene) resin, which can reduce the amount of fossil fuel used and reduce the environmental load. As the biomass-derived material, the above-mentioned biomass PE, biomass PP (polypropylene), etc. can be used. Here, biomass polyethylene is a polymer of a monomer containing ethylene derived from biomass. Since ethylene derived from biomass is used as the raw material monomer, the polymerized polyethylene is derived from biomass. Note that the raw material monomer of polyethylene does not have to contain 100% by mass of ethylene derived from biomass. The second intermediate layer 15 is not limited to biomass-derived materials, and may be formed from materials other than biomass-derived materials (materials derived from fossil fuels), or may be formed using both biomass-derived materials and fossil fuel-derived materials. Examples of materials that can be used are polyethylene and polypropylene.

[0030] The barrier layer 16 is a layer provided for preserving the contents while preventing deterioration, and has a vapor barrier property for preventing the transmission of water vapor and a gas barrier property for preventing the transmission of gases such as oxygen gas. For the barrier layer 16, for example, a metal foil such as aluminum foil, or a vapor deposition film in which a thin film of a metal such as aluminum or a metal oxide such as alumina or silica is formed on a base material by a vapor deposition method or the like can be used.

[0031] The protective layer 17 is provided on the side of the first sealant layer 12 opposite to the base material layer 11, and is the outermost layer of the tube container 1, and is provided to prevent scratches on the surface of the tube container 1. The protective layer 17 is formed to be transparent or nearly transparent so that the printed layer provided on the base material layer 11 can be seen. In addition, the protective layer 17 is endowed with antiviral properties that inactivate viruses, and can significantly suppress the proliferation of viruses attached to the surface of the tube container 1 in cases such as when the tube container 1 is stored in a high humidity environment. Therefore, the protective layer 17 is configured such that the base varnish, which is the base material, contains a plurality of antiviral particles 18. At least a part of the antiviral particles 18 contained in the protective layer 17 is exposed from the surface of the protective layer 17 as shown in Fig. 1, and this makes it possible to largely prevent the proliferation of viruses even if they adhere to the surface of the tube container 1 (protective layer 17).

[0032] As the base varnish which is the base material of the protective layer 17, for example, an ultraviolet-curing coating varnish, a gravure ink (varnish) such as urethane ink, an ultraviolet-curing resin containing a photosensitive monomer or a photopolymerization initiator, etc. can be used. The thickness of the protective layer 17 (layer of base varnish) is preferably formed in the range of 4 μm to 7 μm. If the thickness of the protective layer 17 is less than 4 μm, the thickness of the layer of base varnish becomes too thin, and the scratch resistance of the protective layer 17 cannot be sufficiently ensured, which is undesirable. Also, if the thickness of the protective layer 17 is thicker than 7 μm, it is difficult to expose the contained particles 18 from the surface of the protective layer 17, and the antiviral effect cannot be efficiently obtained, which is undesirable. Here, the thickness of the protective layer 17 refers to the thickness of the base varnish layer, and does not include the height of the particles 18 protruding from the surface of the protective layer 17 (base varnish layer).

[0033] In addition, the antiviral particles 18 contained in the protective layer 17 can be made of one or more types of inorganic antiviral agents containing metal ions such as silver, zinc, and copper, organic antiviral agents such as alcohol-based and surfactant-based antiviral agents, and photocatalytic materials such as titanium oxide and zinc oxide. The average particle diameter of the particles 18 is preferably 0.5 μm or more and 15 μm or less, and more preferably 5 μm or more and 12 μm or less. If the particle diameter of the particles 18 is less than 0.5 μm, the particles are too small and it becomes difficult to expose the particles from the surface of the base varnish (protective layer 17), and sufficient antiviral effect cannot be ensured, which is undesirable. Also, if the particle diameter of the particles 18 is greater than 15 μm, the unevenness of the surface of the tube container 1 (laminate 10) becomes too large, which is undesirable. Here, the particle diameter of the particles 18 refers to the diameter of the particles when they are spherical, the largest diameter when they are ellipsoidal, and the maximum dimension of the outer shape when they have other shapes.

[0034] Here, if the average particle diameter of the antiviral particles 18 is equal to or greater than the thickness of the protective layer 17 (base varnish layer), some of the particles 18 dispersed in the base varnish will be exposed from the surface of the protective layer 17 (base varnish layer) as shown in Fig. 1, and the antiviral effect can be sufficiently ensured on the surface of the tube container 1 (laminate 10). Also, if the average particle diameter of the antiviral particles 18 is larger than the thickness of the protective layer 17 (base varnish layer), the particles 18 can be more reliably exposed from the surface of the protective layer 17 (base varnish layer), and the antiviral effect can be more reliably ensured on the surface of the tube container 1 (laminate 10). Furthermore, if the average particle size of the antiviral particles 18 is small compared to the thickness of the protective layer 17 (layer of base varnish), the particles alone will sink within the protective layer 17 and will not be able to be exposed to the surface, but by adjusting the content of the particles in the protective layer 17, as shown in Fig. 3, multiple particles will overlap within the protective layer 17 (layer of base varnish), and some of the particles 18 will be able to be exposed from the surface of the protective layer 17. This makes it possible to ensure a sufficient antiviral effect on the surface of the tube container 1 (laminate 10), similar to the case shown in Fig. 1.

[0035] From the viewpoint of ensuring sufficient antiviral effect, when viewed from the surface side of the protective layer 17, the ratio of the total area of ​​the particles 18 exposed from the surface of the protective layer 17 to the surface area of ​​the protective layer 17 (hereinafter also referred to as the particle exposure ratio) is desirably 1.5% or more and 10.0% or less. From the same viewpoint as above, the weight ratio of the particles 18 contained in the protective layer 17 (weight ratio of the particles to the base varnish (material of the protective layer 17 other than the particles 18)) is desirably 10% or more and 15% or less when the average particle diameter of the particles 18 is less than the thickness of the protective layer 17 (layer of base varnish), and 2% or more and 10% or less when the average particle diameter of the particles 18 is equal to or greater than the thickness of the protective layer 17 (layer of base varnish).

[0036] The above-mentioned particle exposure ratio can be calculated as follows. Three samples of 10 mm×10 mm are cut out from the surface of the body 2 (laminate 10) of the tube container 1 at arbitrary positions, and the total area of ​​the particles 18 exposed from the surface of the protective layer 17 of each sample is calculated. 2 ) is calculated as the ratio of the total area of ​​the particles 18 exposed from the surface of the protective layer 17. The ratios obtained for the three samples are then averaged to obtain the above-mentioned particle exposed ratio. The samples were cut out from the tube container 1 in a manner that avoided the joint (see FIG. 4) of the body portion 2. The total area of ​​particles 18 exposed from the surface of the protective layer 17 of each sample was determined by photographing the protective layer 17 of each sample from the surface side in the thickness direction (normal direction) of the sample with a camera or the like and processing the image.

[0037] The weight ratio can be calculated as follows: Three samples of 10 mm x 10 mm are cut out from any location on the surface of the body 2 (laminate 10) of the tube container 1, and the total weight of the particles in each sample and the total weight of the base varnish (material other than the particles 18 in the protective layer 17) are measured, and the ratio of the total weight of the particles to the total weight of the base varnish in each sample is calculated. The ratios calculated for the three samples are then averaged to determine the weight ratio. The samples are cut out from the tube container 1 in a manner that avoids the joints (see FIG. 4) of the body 2. The total weight of the particles 18 and base varnish (material of the protective layer 17 other than the particles 18) of each sample can be measured by cutting out each sample, melting it, and separating the sample into the particles 18 and the other parts (base varnish).

[0038] <Tube container> Next, a tube container 1 using the above-mentioned laminate 10 will be described. Fig. 4 is a diagram illustrating a joint portion of a body portion of a tube container according to this embodiment. Fig. 4(A) is an enlarged view of the joint portion in the AA cross section of Fig. 2. Fig. 4(B) is a cross-sectional view corresponding to Fig. 4(A) showing another example of the joint portion of the body portion.

[0039] As shown in FIG. 2, the tube container 1 includes a body portion 2 for accommodating the contents, and a pouring portion 3 that is accommodated in the body portion 2 and enables the contents to be poured out. The body 2 is a portion that contains the contents of the tube container 1, and is formed using the laminate 10 described above. More specifically, the body 2 is formed into a cylindrical shape by bending the laminate 10 so that the protective layer 17 is on the outside, overlapping one end edge of the laminate 10 with the other end edge, and joining the overlapped portion by heat sealing, as shown in FIG. 4(A). The pouring part 3 is attached to one open end edge of the cylindrically formed laminate 10, and the other open end edge is folded and further heat sealed to form a bottom 2a in the body 2 (see FIG. 2), forming a storage part that contains the contents. The contents are filled from the other open end side of the cylindrical body 2 to which the pouring part 3 is attached, and after filling, the bottom 2a is formed by heat sealing, thereby sealing. Here, the protective layer 17 is formed to avoid the area where one edge and the other edge of the laminate 10 overlap. Therefore, as shown in Fig. 4(A), the first sealant layer 12 and the second sealant layer 13 can be in direct contact with each other at the area where one edge and the other edge overlap, and the bonding strength between the one edge and the other edge of the laminate 10 can be improved.

[0040] Also, as shown in FIG. 4(B), the body 2 may be formed by forming the laminate 10 into a cylindrical shape using a joining member 20. Specifically, the laminate 10 may be formed into a cylindrical shape by butting one end edge and the other end edge together, overlapping the joining member 20 from the front side so as to cover the one end edge and the other end edge of the laminate 10, and heat-sealing and joining the overlapped portion. In this case, the protective layer 17 is formed so as to avoid the portion of the one end edge and the other end edge of the laminate 10 that overlaps with the joining member 20. This allows the joining member 20 to directly contact the first sealant layer 12 of the laminate 10, thereby improving the joining strength between the laminate 10 and the joining member 20.

[0041] The pouring part 3 is a part capable of pouring out the contents contained in the body 2, and includes a shoulder part 4 and a mouth part 5. The shoulder part 4 is a member joined to the open end opposite the bottom part 2a of the cylindrically formed body 2, and the mouth part 5 is provided on the opposite side of the shoulder part 4 from the body 2, and is an opening capable of pouring out the contents contained in the body 2. A cap 6 capable of opening and closing the opening is detachably provided on the mouth part 5.

[0042] As described above, the tube container 1 and the laminate 10 of this embodiment provide the following advantages. (1) In the tube container 1 and the laminate 10, the protective layer 17 contains a plurality of particles 18 having antiviral properties, and at least a portion of the plurality of particles 18 is exposed from the surface of the protective layer 17, so that the antiviral effect can be sufficiently ensured on the surface of the tube container 1 (laminate 10). (2) When viewed from the surface side of the protective layer 17, the ratio of the total area of ​​the particles 18 exposed from the surface of the protective layer 17 to the area of ​​the surface of the protective layer 17 (particle exposure ratio) of the tube container 1 and the laminate 10 is 1.5% or more and 10.0% or less, so that the antiviral effect can be more efficiently and sufficiently ensured. (3) In the tube container 1 and the laminate 10, the weight ratio of the particles contained in the protective layer is 2% or more and 15% or less, so that the antiviral effect can be more efficiently and sufficiently ensured. (4) Since the average particle diameter of the particles contained in the protective layer of the tube container 1 and the laminate 10 is equal to or greater than the thickness of the protective layer, some of the multiple particles 18 dispersed in the protective layer 17 are exposed from the surface of the protective layer 17 (the layer of base varnish), thereby more reliably ensuring the antiviral effect on the surface of the tube container 1 (laminate 10). (5) In the tube container 1 and the laminate 10, the protective layer 17 is formed to avoid the area where one edge and the other edge of the laminate 10 overlap. Therefore, in the area where one edge and the other edge overlap, the first sealant layer 12 and the second sealant layer 13 can be in direct contact with each other, thereby improving the bonding strength between the one edge and the other edge of the laminate 10. (6) In the tube container 1 and the laminate 10, the protective layer 17 is formed to avoid the area where the joining member 20 of the laminate 10 overlaps, so that the joining member 20 can be brought into direct contact with the first sealant layer 12, thereby improving the joining strength between the laminate 10 and the joining member 20. (7) The tubular container 1 and the laminate 10 contain a biomass-derived material in the second intermediate layer 15 among the layers constituting the laminate 10, so that the amount of fossil fuel used can be reduced, thereby reducing the environmental burden. EXAMPLES

[0043] The present invention will be described in further detail below with reference to examples. [Example 1] The laminate of Example 1 uses a PET resin sheet having a thickness of 12 μm as the base layer 11. A printed layer is formed on one side of the base layer 11, and a polyethylene resin layer having a thickness of 25 μm and a polyethylene resin layer having a thickness of 35 μm are laminated in this order on the printed layer as the first sealant layer 12 via an anchor coat layer. In addition, a protective layer 17 is laminated on the surface of the first sealant layer 12 opposite the base layer 11 by a base varnish containing antiviral particles 18. Here, the particles 18 used in the protective layer 17 of Example 1 are an inorganic antiviral agent containing silver ions, and have an average particle diameter of 0.8 μm. In addition, an ultraviolet-curing coating varnish is used for the base varnish, and the thickness of the base varnish layer is formed to be 5.0 μm, and the weight ratio (addition amount) of the particles 18 contained in the protective layer 17 is 10%. In addition, when viewed from the surface side of the protective layer 17, the ratio of the total area of ​​the particles 18 exposed from the surface of the protective layer 17 to the surface area of ​​the protective layer 17 (particle exposure ratio) is 7.2%. A PET film (thickness 12 μm) on which a metal (aluminum) is vapor-deposited is laminated as a first intermediate layer 14 on the side of the base material layer 11 opposite the first sealant layer 12, with the vapor-deposited surface facing the base material layer 11. In addition, a polyethylene resin layer having a thickness of 20 μm and a biomass PE (polyethylene) resin layer having a thickness of 130 μm are laminated in this order as a second intermediate layer 15 on the side of the first intermediate layer 14 opposite the base material layer 11, with an anchor coat layer interposed therebetween. Furthermore, a metal foil (aluminum foil) having a thickness of 10 μm is laminated as a barrier layer 16 on the side of the second intermediate layer 15 opposite to the first intermediate layer 14. Moreover, a layer of polyethylene resin having a thickness of 25 μm and a layer of polyethylene resin having a thickness of 25 μm are laminated in this order as a second sealant layer 13 on the side of the barrier layer 16 opposite to the second intermediate layer 15. For bonding the barrier layer 16 to the second intermediate layer 15 and the second sealant layer 13, EMAA resin (ethylene-methacrylic acid copolymer resin) is used.

[0044] [Example 2] The laminate of Example 2 is similar to the laminate of Example 1, except that the antiviral particles 18 are changed to ether-based organic particles. The average particle diameter of the particles 18 of Example 2 is 5.0 μm, and the thickness of the base varnish layer is 5.0 μm. The weight ratio (addition amount) of the particles 18 contained in the protective layer 17 is 10%. In addition, when viewed from the surface side of the protective layer 17, the ratio of the total area of ​​the particles 18 exposed from the surface of the protective layer 17 to the surface area of ​​the protective layer 17 (particle exposure ratio) is 9.0%.

[0045] [Example 3] The laminate of Example 3 is similar to the laminate of Example 1, except that the antiviral particles 18 are changed to a material in which an organic antiviral agent and an inorganic material are mixed. The average particle diameter of the particles 18 of Example 3 is 12.0 μm, and the thickness of the base varnish layer is 5.0 μm. The weight ratio (addition amount) of the particles 18 contained in the protective layer 17 is 2.5%. In addition, when viewed from the surface side of the protective layer 17, the ratio of the total area of ​​the particles 18 exposed from the surface of the protective layer 17 to the surface area of ​​the protective layer 17 (particle exposure ratio) is 1.8%.

[0046] [Comparative Example] The laminate of the comparative example is similar to the laminate of Example 1, except that the protective layer 17 is only a layer of base varnish, ie, the base varnish does not contain antiviral particles 18.

[0047] The evaluation results of the antiviral properties of each of the laminates of the Examples and Comparative Examples are summarized in Table 1 below. [Table 1]

[0048] [Antiviral evaluation] Influenza A virus (H3N2, A / Hong Kong / 8 / 68; TC adapted ATCC1679) was used and the test virus suspension was obtained by culturing the virus in MDCK cells (canine kidney-derived cells). A sample of each Example and Comparative Example cut to 5 cm x 5 cm was placed in a sterilized petri dish, 0.4 ml of the above-mentioned test virus suspension was inoculated onto the sample, and the sample was covered with a sterile polyethylene film cut to 4 cm x 4 cm. The film was then lightly pressed so that the test virus suspension was spread over the entire film, and the petri dish was then covered with a lid. After storing these dishes for 24 hours under an environment of 25°C and a relative humidity of 90% or more, the test specimens were removed from the dishes, 10 ml of SCDPL medium was added to wash off the virus, and the virus infectivity was measured by the plaque assay. The antiviral activity value was calculated by the following formula (1).

[0049] Equation (1) R=Ut-At

[0050] where R is the antiviral activity value, and Ut is the viral infectivity (PFU / cm) of the unprocessed sample after standing for 24 hours. 2 ) and At is the viral infectivity (PFU / cm) of the antiviral processed product sample after standing for 24 hours. 2 ) is the average of the base 10 logarithms of

[0051] When the antiviral activity value R calculated by the above formula (1) is equal to or greater than the standard value (2.0) (R≧2.0), it indicates that the antiviral effect is sufficient. When the antiviral activity value R is less than the standard value (2.0) (R<2.0), it indicates that the antiviral effect is insufficient. This antiviral evaluation is stipulated in ISO21702. As can be seen from the evaluation results in Table 1, the sample of the comparative example had an antiviral activity value R of less than 2.0, and therefore had insufficient antiviral effect, whereas the samples of each Example all had an antiviral activity value R of 2.0 or more, and were therefore confirmed to have sufficient antiviral effect. In addition, the samples of each embodiment in which the antiviral effect was confirmed satisfied the preferred range of particle surface ratio (1.5% or more and 10.0% or less), and furthermore, it was confirmed that the weight ratio of particles 18 contained in protective layer 17 satisfied the preferred range (2% or more and 15% or less).

[0052] (Variations) The present invention is not limited to the above-described embodiment, and various modifications and variations are possible, and these are also within the scope of the present invention.

[0053] (1) The laminate 10 constituting the body 2 of the tube container 1 has been described as including the first intermediate layer 14, the second intermediate layer 15, and the barrier layer 16, but is not limited thereto. For example, the laminate 10 may omit one or more of the above layers or may have an additional functional layer depending on the intended use of the tube container 1, etc.

[0054] (2) Although the laminate 10 has been described as an example in which the second intermediate layer 15 is formed from a biomass-derived material, the laminate 10 is not limited thereto. In the laminate 10, layers other than the second intermediate layer 15, such as the base layer 11, the first sealant layer 12, and the second sealant layer 13, may be formed from a biomass-derived material. For example, the first sealant layer 12 may be formed from a biomass-derived polyethylene resin. [Explanation of symbols]

[0055] 1 tube container 10 Laminate 11 Base material layer 12 First sealant layer 13 Second sealant layer 14 First Middle Class 15 The second middle class 16 Barrier Layer 17 Protective layer 18 particles

Claims

1. A tube container having a body portion for accommodating contents and a pouring portion capable of pouring out the accommodated contents, The body portion is formed of a laminate, The laminate comprises: A base layer; A first sealant layer provided on one surface side of the base material layer; A second sealant layer provided on the other surface side of the base material layer; a protective layer provided on a surface of the first sealant layer opposite to the base layer, The protective layer is an outermost layer of the tube container, has a base varnish as a base material, and contains a plurality of particles having antiviral properties. At least a portion of the plurality of particles is exposed from a surface of the protective layer, when viewed from the surface side of the protective layer, a ratio of a total area of ​​the particles exposed from the surface of the protective layer to an area of ​​the surface of the protective layer is 1.5% or more and 10.0% or less; A tube container, wherein the weight ratio of the particles contained in the protective layer is 2% or more and 15% or less.

2. 2. The tube container according to claim 1, wherein the average particle size of the particles contained in the protective layer is equal to or greater than the thickness of the protective layer.

3. The body portion is formed by overlapping and joining one end edge of the laminate to the other end edge, 3. The tube container according to claim 1, wherein the protective layer is formed to avoid an area where one end edge and the other end edge of the laminate overlap each other.

4. The body portion includes a joining member that joins one end edge and the other end edge of the laminate, 3. The tube container according to claim 1, wherein the protective layer is formed to avoid an area where the joining members of the laminate overlap.

5. The tube container according to claim 1 , wherein at least a part of the layers constituting the laminate contains a material derived from biomass.

6. A base layer; A first sealant layer provided on one surface side of the base material layer; A second sealant layer provided on the other surface side of the base material layer; a protective layer provided on a surface of the first sealant layer opposite to the base layer, The protective layer is made of a base varnish and contains a plurality of particles having antiviral properties. At least a portion of the plurality of particles is exposed from a surface of the protective layer, when viewed from the surface side of the protective layer, a ratio of a total area of ​​the particles exposed from the surface of the protective layer to an area of ​​the surface of the protective layer is 1.5% or more and 10.0% or less; A laminate, wherein the weight ratio of the particles contained in the protective layer is 2% or more and 15% or less.

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