Adhesive tape for capsule containers and capsule toys

Abstract

To provide an adhesive tape for capsule containers that can suppress the deterioration of the quality of recycled material even when recycled together with the capsule container without separation, and to provide a capsule toy that can suppress the deterioration of the quality of recycled material even when the capsule container and the adhesive tape for capsule containers are recycled together without separation. [Solution] The adhesive tape for capsule containers of the present invention is an adhesive tape used for capsule containers containing a polyolefin-based resin material, and comprises a base material containing a polyolefin-based resin material, and an adhesive layer provided on one side of the base material, containing at least one selected from the group consisting of olefin-based adhesives and styrene-based adhesives. Furthermore, it is preferable that the adhesive tape for capsule containers is used to seal the capsule container.

Description

Technical Field

[0001] The present invention relates to an adhesive tape for a capsule container and a capsule toy.

Background Art

[0002] In recent years, against the backdrop of environmental issues and the reduction of plastic resource consumption, for example, as described in Patent Document 1, material recycling is practiced to obtain a resin material (recycled resin material) from used plastic molded containers.

[0003] Conventionally, capsule containers for housing toys, prizes, etc. and used in prize-winning game machines, vending machines, etc. are known. Such capsule containers are made of, for example, synthetic resin. Material recycling is also practiced for such capsule containers. Such capsule containers generally have a substantially spherical shape, and each half-container body obtained by dividing the capsule container into two halves is fitted at the opening. Further, since this capsule container easily disengages the fitting between the half-container bodies when deformed by an external load, the fitting may be reinforced with an adhesive tape after housing a prize.

[0004] Therefore, in order to collect used capsule containers and perform material recycling, it is necessary to separate and select the resin material of the capsule container and other materials, for example, the material constituting the adhesive tape. However, for a person who has purchased a prize or the like housed in a capsule container, separating the capsule container from waste such as an adhesive tape other than the capsule container is cumbersome. Therefore, waste other than the capsule container is often discarded together with the capsule container in a trash can or the like. Therefore, when recycling a capsule container, there is a problem that materials other than the capsule container are mixed into the recycled material, resulting in a decrease in the quality of the recycled material.

Prior Art Documents

Patent Documents

[0005] [Patent Document 1] Japanese Patent Publication No. 2003-155049 [Overview of the project] [Problems that the invention aims to solve]

[0006] The object of the present invention is to provide an adhesive tape for capsule containers that can suppress the deterioration of the quality of recycled material even when recycled together with the capsule container without separation, and to provide a capsule toy that can suppress the deterioration of the quality of recycled material even when the capsule container and the adhesive tape for capsule containers are recycled together without separation. [Means for solving the problem]

[0007] These objectives are achieved by the present invention as described in (1) to (8) below. (1) An adhesive tape used for capsule containers containing polyolefin resin material, A substrate containing a polyolefin-based resin material, An adhesive layer is provided on one side of the substrate and comprises at least one selected from the group consisting of olefin-based adhesives and styrene-based adhesives. Adhesive tape for capsule containers having the following properties.

[0008] (2) The adhesive tape for capsule containers described in (1) above, wherein the adhesive tape for capsule containers is used to seal the capsule container.

[0009] (3) The adhesive tape for capsule containers according to (1) or (2) above, wherein the adhesive tape for capsule containers is used to fix an article stored in the capsule container to the inner wall of the capsule container.

[0010] (4) The adhesive tape for capsule containers as described in (3) above, wherein the article is a packaging material containing polyolefin resin material in which the contents are stored.

[0011] (5) The adhesive tape for capsule containers according to any one of (1) to (4) above, wherein the thickness of the substrate is 20 μm or more and 80 μm or less.

[0012] (6) The adhesive tape for capsule containers according to any one of (1) to (5) above, wherein the thickness of the adhesive layer is 5 μm or more and 35 μm or less.

[0013] (7) The size of the capsule container is 48 mm or more and 90 mm or less in diameter, and is an adhesive tape for capsule containers as described in any of (1) to (6) above.

[0014] (8) Capsule container containing a polyolefin-based resin material, The article contained in the aforementioned capsule container, The adhesive tape for capsule containers described in any of (1) to (7) above, A capsule toy that has [something]. [Effects of the Invention]

[0015] According to the present invention, it is possible to provide an adhesive tape for capsule containers that can suppress the deterioration of the quality of recycled material even when recycled together with the capsule container without separation, and to provide a capsule toy that can suppress the deterioration of the quality of recycled material even when the capsule container and the adhesive tape for capsule containers are recycled together without separation. [Brief explanation of the drawing]

[0016] [Figure 1] This is a perspective view showing a preferred embodiment of the capsule toy of the present invention. [Figure 2] Figure 1 is a perspective view showing the capsule container of the capsule toy in an open state. [Figure 3] This is a schematic longitudinal cross-sectional view showing a preferred embodiment of the adhesive tape for capsule containers of the present invention. [Modes for carrying out the invention]

[0017] Hereinafter, preferred embodiments of the present invention will be described in detail. [1] Capsule toy First, the capsule toy of the present invention will be described.

[0018] FIG. 1 is a perspective view showing a preferred embodiment of the capsule toy of the present invention. FIG. 2 is a perspective view showing a state in which the capsule container of the capsule toy of FIG. 1 is opened.

[0019] The capsule toy 100 includes a capsule container 50 containing a polyolefin-based resin material, an article 30 housed in the capsule container 50, and an adhesive tape 10 for the capsule container.

[0020] Further, the adhesive tape 10 for the capsule container, which will be described later, has a base material 11 containing a polyolefin-based resin material, and an adhesive layer 12 provided on one surface of the base material 11 and containing at least one selected from the group consisting of an olefin-based adhesive and a styrene-based adhesive.

[0021] With such a configuration, it is possible to provide a capsule toy 100 that can suppress a decrease in the quality of recycled materials even when the capsule container 50 and the adhesive tape 10 for the capsule container are recycled together without separation.

[0022] Hereinafter, the "adhesive tape for the capsule container" will also be simply referred to as the "adhesive tape". The capsule toy 100, for example, as shown in FIG. 2, houses an article 30 such as a toy or a prize, and is used in a prize acquisition game machine, a vending machine, or the like.

[0023] FIG. 1 shows a state in which the capsule container 50 of the capsule toy 100 houses the article 30. In FIG. 1, the capsule container 50 is composed of a thin upper container body 51 and a lower container body 52 formed in a substantially hemispherical shape. For the sake of explanation, terms such as upper and lower are added to the upper container body or the lower container body, etc., but these are used for convenience of explanation to indicate the relative sides, and do not indicate the actual top and bottom directions.

[0024] As shown in Figure 2, the upper container body 51 is a thin-walled, approximately hemispherical member with a shape resembling a hollow sphere divided into two, and having a circular opening 55 at one end. The inner wall of the upper container body 51, extending from the opening end 56 that forms the opening 55 to a predetermined width, engages with the outer periphery 59 of the lower container body 52, which will be described later.

[0025] Furthermore, the lower container body 52 is a thin-walled, approximately hemispherical member with a circular opening 57 at one end, and is shaped like a hollow sphere divided into two. The outer circumferential surface of the lower container body 52, extending from the opening end 58 that forms the opening 57 to a predetermined width, is called the outer circumferential portion 59. The outer circumferential portion 59 is a cylindrical part whose outer diameter is slightly smaller than that of the opening 55. The upper container body 51 and the lower container body 52 engage when the outer circumferential portion 59 is fitted into the opening 55 of the upper container body 51 described above.

[0026] Furthermore, the upper container body 51 and the lower container body 52 may not be hemispherical in shape close to a perfect sphere, but rather flattened in shape with a flat surface on part of them. Also, engagement between the upper container body 51 and the lower container body 52 is performed, for example, by facing the opening 55 of the upper container body 51 and the opening 57 of the lower container body 52 toward each other and pressing the upper container body 51 and the lower container body 52 together from above and below.

[0027] Furthermore, for example, the engagement between the upper container body 51 and the lower container body 52 may be achieved by screwing the upper container body 51 and the lower container body 52 together while rotating them, by providing a groove in which the inner wall of the upper container body 51 and the outer circumference 59 of the lower container body 52 are screwed together. Alternatively, for example, instead of providing an outer circumference 59 on the lower container body 52, a fastener may be extended from the open end 58 of the lower container body 52 and fitted into a projection provided on the outer wall of the upper container body 51, thereby engaging the upper container body 51 and the lower container body 52. ​​Also, for example, the upper container body 51 and the lower container body 52 may be pre-connected by a hinge or the like before engagement.

[0028] The upper container 51 and the lower container 52 contain a polyolefin-based resin material. Examples of polyolefin-based resin materials include polypropylene and polyethylene. The capsule container 50 may also contain a resin material other than a polyolefin-based resin material. Examples of resin materials other than polyolefin-based resin materials include styrene-based resin materials.

[0029] Furthermore, the proportion of polyolefin-based resin material in the total mass of the capsule container 50 is preferably 70% by mass or more, more preferably 80% by mass or more, and even more preferably 90% by mass or more. This allows the effects described above to be exhibited more significantly.

[0030] Furthermore, the polyolefin-based resin material contained in the upper container 51 and the lower container 52 may be different from the polyolefin-based resin material contained in the adhesive tape 10, but it is preferable that the constituent monomers are the same. This makes it possible to more effectively suppress the deterioration of the quality of the recycled material even when the upper container 51 and the lower container 52 and the adhesive tape 10 are recycled together without being separated.

[0031] Furthermore, the polyolefin-based resin material contained in the upper container 51 and the polyolefin-based resin material contained in the lower container 52 may have the same or different constituent monomers.

[0032] After engagement, the upper container body 51 and the lower container body 52 may unintentionally disengage due to external forces. Therefore, in Figure 1, adhesive tape 10 is applied to seal the boundary 53 between the opening 55 of the upper container body 51 and the opening 57 of the lower container body 52. ​​This further reinforces the engagement between the upper container body 51 and the lower container body 52. ​​Thus, it is possible to more effectively prevent the upper container body 51 and the lower container body 52 from unintentionally disengaging. Furthermore, since both the adhesive tape 10 and the capsule container 50 contain at least one selected from the group consisting of a polyolefin-based resin material and a styrene-based adhesive that does not affect the olefin during recycling, even if the adhesive tape 10 and the capsule container 50 are recycled together without separation when recycling the capsule container 50, the deterioration of the quality of the recycled material can be further suppressed.

[0033] Furthermore, the adhesive tape 10 may be applied to a portion of the boundary 53 between the opening 55 of the upper container body 51 and the opening 57 of the lower container body 52, or the adhesive tape 10 may be applied so that the entire boundary 53 is covered. In addition, multiple pieces of adhesive tape 10 may be applied to the boundary 53, or parts of the adhesive tape 10 may be overlapped (for example, in a cross shape).

[0034] Furthermore, in Figure 2, the adhesive tape 10 is used to fix the article 30 stored in the capsule container 50 to the inner wall of the capsule container 50.

[0035] As a result, the article 30 is fixed to the capsule container 50, which more effectively prevents the article 30 from falling out when the capsule container 50 is opened. Furthermore, since both the adhesive tape 10 and the capsule container 50 contain at least one selected from the group consisting of a polyolefin-based resin material and a styrene-based adhesive that does not easily affect the olefin during recycling, even if the adhesive tape 10, packaging material 32, and capsule container 50 are recycled together without being separated when recycling the capsule container 50, the deterioration of the quality of the recycled material can be further suppressed. Note that in Figure 2, the article 30 is fixed to the inner wall of the lower container body 52, but the article 30 may also be fixed to the inner wall of the upper container body 51.

[0036] Furthermore, in Figure 2, the article 30 is a package 32 containing a polyolefin-based resin material, in which the contents 31 are housed. That is, the contents 31 are housed in the package 32 and then placed inside the capsule container 50. In Figure 2, the package 32 containing the contents 31 is fixed to the inner wall of the lower container body 52 by adhesive tape 10.

[0037] Because the contents 31 are contained within the packaging material 32, it is possible to more effectively prevent damage such as scratches caused by the contents 31 directly contacting the inner wall of the capsule container 50 during transportation or purchase. Furthermore, since the adhesive tape 10, the packaging material 32, and the capsule container 50 all contain at least one selected from the group consisting of polyolefin-based resin materials and styrene-based adhesives that do not significantly affect olefins during recycling, even if the adhesive tape 10, packaging material 32, and capsule container 50 are recycled together without separation during recycling, the deterioration of the quality of the recycled materials can be further suppressed. The contents 31 are not particularly limited, but examples include toys and prizes.

[0038] Furthermore, the adhesive tape 10 may also be used to seal the packaging material 32 containing the contents 31. In this case, it is possible to more effectively prevent the contents 31 from falling out of the packaging material 32. Also, even if the adhesive tape 10, packaging material 32, and capsule container 50 are recycled together without being separated, the deterioration of the quality of the recycled material can be further suppressed. Note that when the adhesive tape 10 is used to seal the packaging material 32 containing the contents 31, the packaging material 32 containing the contents 31 does not need to be fixed to the inner wall of the capsule container 50.

[0039] Furthermore, the size of the capsule container 50 is preferably 48 mm to 90 mm in diameter, more preferably 48 mm to 75 mm in diameter, and even more preferably 48 mm to 65 mm in diameter.

[0040] In this invention, the diameter of the capsule container 50 refers to the diameter of the circular area in plan view enclosed by the boundary 53.

[0041] This makes the curvature of the surface of the capsule container 50 more suitable for the application of the adhesive tape 10. As a result, handling is improved when applying the adhesive tape 10 and when peeling off the adhesive tape 10 when opening the capsule container 50.

[0042] [2] Adhesive tape for capsule containers Next, the adhesive tape for capsule containers of the present invention will be described.

[0043] Figure 3 is a schematic longitudinal cross-sectional view showing a preferred embodiment of the adhesive tape for capsule containers of the present invention.

[0044] The adhesive tape 10 is used in a capsule container 50 containing a polyolefin resin material, and comprises a base material 11 containing a polyolefin resin material, and an adhesive layer 12 provided on one side of the base material 11, containing at least one selected from the group consisting of olefin adhesives and styrene adhesives.

[0045] This configuration makes it possible to provide an adhesive tape 10 that can be recycled together with the capsule container 50 without separation, while suppressing the deterioration of the quality of the recycled material.

[0046] More specifically, both the base material 11 and the capsule container 50 contain a polyolefin-based resin material. This makes it possible to suppress the deterioration of the quality of the recycled material even when the capsule container 50 and the adhesive tape 10 are recycled together without being separated.

[0047] Furthermore, if the adhesive layer 12 contains an olefin-based adhesive, both the adhesive layer 12 and the capsule container 50 contain polyolefin-based resin materials. Therefore, even if the capsule container 50 and the adhesive tape 10 are recycled together without separation, a deterioration in the quality of the recycled material can be suppressed. Also, if the adhesive layer 12 contains a styrene-based adhesive, the styrene-based adhesive has little effect on the olefin during recycling. Therefore, even if the capsule container 50 and the adhesive tape 10 are recycled together without separation, a deterioration in the quality of the recycled material can be suppressed.

[0048] [2-1] Base material The base material 11 is a sheet-like component and has the function of supporting the adhesive layer 12. The base material 11 also contains at least a polyolefin-based resin material.

[0049] This makes it possible to provide an adhesive tape 10 that can be recycled together with the capsule container 50 without separation, while suppressing the deterioration of the quality of the recycled material.

[0050] Polyolefin resins are polymer compounds having a chemical structure obtained by polymerizing olefins containing carbon-carbon double bonds as monomers.

[0051] Such polyolefin resins generally possess excellent flexibility and transparency. Therefore, by having the base material 11 composed of a material containing a polyolefin resin, an adhesive tape 10 can be obtained that conforms well to curved surfaces and has high visibility of the attached capsule container 50.

[0052] Furthermore, because the base material 11 contains a polyolefin-based resin material, it is possible to achieve excellent adhesion between the base material 11 and the adhesive layer 12. It is also advantageous in terms of cost.

[0053] Examples of polyolefin resins constituting the base material 11 include polyethylene (PE), polypropylene (PP), polybutene (PB), ethylene-propylene copolymer, olefin elastomer (TPO), ethylene-vinyl acetate copolymer (EVA), ethylene-methyl methacrylate copolymer (EMMA), and olefin ternary copolymers such as ethylene-propylene-(5-ethylidene-2-norbornene). One or more of these can be selected and used in combination, but it is preferable that at least one of polypropylene and polyethylene be used, and more preferably polypropylene. Polypropylene may be, for example, stretched polypropylene (OPP). In that case, the transparency, dimensional stability, and curved surface conformability of the adhesive tape 10 can be improved.

[0054] Furthermore, it is preferable that the polyolefin-based resin material contained in the base material 11 has the same constituent monomers as the polyolefin-based resin material contained in the capsule container 50. This makes it possible to more effectively suppress the deterioration of the quality of the recycled material even when the capsule container 50 and the adhesive tape 10 are recycled together without being separated.

[0055] The content of polyolefin-based resin material in the base material 11 is preferably 70.0% by mass or more, more preferably 80.0% by mass or more, and even more preferably 90.0% by mass or more.

[0056] When the base material 11 is composed of a polyolefin-based resin material, the base material 11 may contain other resin materials other than polyolefin-based resins in addition to the polyolefin-based resin.

[0057] Examples of resin materials other than polyolefin resins included in the base material 11 include polyester resins such as polystyrene, polyethylene terephthalate (PET), polybutylene succinate, and polylactic acid; acetate resin, acrylonitrile-butadiene-styrene copolymer (ABS) resin, polyvinyl chloride (PVC), polyamide, polyimide, polycarbonate, and cellulose acetate. One or more of these can be selected and used in combination.

[0058] The content of resin materials other than polyolefins in the base material 11 is preferably 15.0% by mass or less, more preferably 10.0% by mass or less, and even more preferably 5.0% by mass or less.

[0059] The base material 11 may contain components other than resin materials. Examples of components other than resin materials include plasticizers, stabilizers, colorants, fillers, and flame retardants. However, the content of components other than resin materials in the base material 11 is preferably 10.0% by mass or less, more preferably 8.0% by mass or less, and even more preferably 7.0% by mass or less.

[0060] The thickness of the substrate 11 is not particularly limited, but is preferably 20 μm or more and 80 μm or less, more preferably 30 μm or more and 70 μm or less, and even more preferably 40 μm or more and 60 μm or less.

[0061] This improves the mechanical strength of the adhesive tape 10, the ease of handling when applying the adhesive tape 10, and the ease of handling when peeling off the adhesive tape 10 when opening the capsule container 50.

[0062] [2-2] Adhesive layer The adhesive layer 12 is provided on one side of the base material 11 and has the function of attaching the adhesive tape 10 to the capsule container 50 or the like. The adhesive layer 12 also contains at least one selected from the group consisting of olefin-based adhesives and styrene-based adhesives.

[0063] This makes it possible to suppress the deterioration of the quality of recycled materials even when the adhesive tape 10 and the capsule container 50 are recycled together without being separated.

[0064] Furthermore, it is preferable that the adhesive layer 12 contains an olefin-based adhesive. As a result, since both the adhesive layer 12 and the capsule container 50 contain polyolefin-based resin material, even if the adhesive tape 10 and the capsule container 50 are recycled together without being separated when recycling the capsule container 50, the deterioration of the quality of the recycled material can be more effectively suppressed.

[0065] The olefin-based adhesive is not particularly limited, but preferably contains, for example, an olefin-based polymer, a tackifier, and a plasticizer. Similarly, the styrene-based adhesive is not particularly limited, but preferably contains, for example, a styrene-based polymer, a tackifier, and a plasticizer.

[0066] [2-2-1] Olefin-based polymer Examples of olefin-based polymers include olefin-based elastomers. These olefin-based elastomers may be those polymerized using a Ziegranata catalyst, or those polymerized using a metallocene catalyst.

[0067] Examples of olefin-based elastomers include at least one selected from the group consisting of (1) α-olefin homopolymer elastomers having 4 to 10 carbon atoms, (2) ethylene-propylene copolymer elastomers, (3) ethylene-α-olefin copolymer elastomers having 4 to 10 carbon atoms, (4) propylene-α-olefin copolymer elastomers having 4 to 10 carbon atoms, and (5) ethylene-propylene-α-olefin copolymer elastomers having 4 to 10 carbon atoms. Ethylene-propylene copolymer elastomers and ethylene-α-olefin copolymer elastomers having 4 to 10 carbon atoms are copolymer elastomers that contain the most ethylene constituent units. Propylene-α-olefin copolymer elastomers having 4 to 10 carbon atoms are copolymer elastomers that contain the most propylene constituent units. The olefin-based elastomer is, for example, specifically, at least one olefin-based elastomer selected from the group consisting of polybutene elastomer, polyisobutylene elastomer, ethylene-propylene copolymer elastomer, ethylene-butene copolymer elastomer, ethylene-octene copolymer elastomer, and ethylene-propylene-butene copolymer elastomer. The olefin-based elastomer may be used alone or in combination of two or more types. The olefin-based elastomer may also be a block copolymer.

[0068] The olefin-based polymer may, if necessary, further contain at least one polyolefin resin from polyethylene and polypropylene in addition to the olefin-based elastomer. When the olefin-based polymer contains at least one of polyethylene and polypropylene, the content of these polyolefin resins should be less than that of the olefin-based elastomer. Specifically, for every 100 parts by mass of the total of the olefin-based elastomer and at least one of polyethylene and polypropylene, the amount of at least one of polyethylene and polypropylene is preferably less than 50% by mass, and more preferably 45% by mass or less. The polyethylene and polypropylene may be resins synthesized by known polymerization methods. For example, they may be resins synthesized with a metallocene catalyst, or resins polymerized using a Ziegranata catalyst.

[0069] The content of the olefin-based polymer is preferably 20% to 55% by mass, more preferably 23% to 53% by mass, and even more preferably 25% to 50% by mass, based on the total amount (100% by mass) of the adhesive layer 12.

[0070] [2-2-2] Styrene-based polymers Examples of styrene-based polymers include styrene elastomers. Specifically, examples of styrene elastomers include at least one styrene elastomer selected from the group consisting of styrene-isobutylene block copolymer, styrene-butadiene block copolymer, styrene-isoprene block copolymer, styrene-isobutylene-styrene block copolymer, styrene-butadiene-styrene block copolymer, styrene-isoprene-styrene block copolymer, styrene-ethylene-butylene block copolymer, styrene-ethylene-propylene block copolymer, styrene-ethylene-ethylene-propylene block copolymer, and styrene-butadiene-butene-styrene block copolymer. The styrene elastomer is not particularly limited, but a styrene block copolymer is preferred. The styrene elastomer may be used alone or in combination of two or more types.

[0071] The styrene-based polymer content is preferably 20% to 55% by mass, more preferably 23% to 53% by mass, and even more preferably 25% to 50% by mass, based on the total amount (100% by mass) of the adhesive layer 12.

[0072] [2-2-3] Tackifier The adhesive layer 12 may contain a tackifier. The tackifier is not particularly limited, but examples include at least one selected from petroleum resins, terpene resins, rosin resins, and styrene resins.

[0073] The tackifier content is preferably 20% to 70% by mass, more preferably 23% to 68% by mass, and even more preferably 25% to 65% by mass, based on the total (100% by mass) of the adhesive layer 12.

[0074] [2-2-4] Plasticizers The adhesive layer 12 may contain a plasticizer. The plasticizer is not particularly limited, but examples include natural oils (olive oil, camellia oil, castor oil, and tall oil, etc.), dialkyl dibasic acids (dibutyl phthalate, dioctyl phthalate, and dibutyl adipate, etc.), and liquid resins (liquid polybutene and liquid polyisoprene, etc.).

[0075] The plasticizer content is preferably 5% by mass or more and 40% by mass or less, more preferably 8% by mass or more and 38% by mass or less, and even more preferably 10% by mass or more and 35% by mass or less, based on the total (100% by mass) of the adhesive layer 12.

[0076] [2-2-5] Other ingredients The adhesive layer 12 may contain components other than those described above in [2-2-1] to [2-2-4]. Hereinafter, such components will also be referred to as "other components" in this section. Examples of other components include antioxidants, ultraviolet absorbers, stabilizers, colorants, fillers, and flame retardants. However, the content of other components in the adhesive layer 12 is preferably 10.0% by mass or less, more preferably 8.0% by mass or less, and even more preferably 7.0% by mass or less.

[0077] [2-2-6] Other conditions The thickness of the adhesive layer 12 is not particularly limited, but is preferably 5 μm or more and 35 μm or less, more preferably 8 μm or more and 30 μm or less, and even more preferably 11 μm or more and 25 μm or less.

[0078] This improves the mechanical strength of the adhesive tape 10, the ease of handling when applying the adhesive tape 10, and the ease of handling when peeling off the adhesive tape 10 when opening the capsule container 50.

[0079] The width of the adhesive tape 10 is not particularly limited, but is preferably 12 mm or more and 24 mm or less, more preferably 12 mm or more and 20 mm or less, and even more preferably 12 mm or more and 18 mm or less.

[0080] This improves the mechanical strength of the adhesive tape 10, the ease of handling when applying the adhesive tape 10, and the ease of handling when peeling off the adhesive tape 10 when opening the capsule container 50. In addition, it improves the sealing performance between the upper container body 51 and the lower container body 52.

[0081] Although preferred embodiments of the present invention have been described above, the present invention is not limited thereto.

[0082] For example, the adhesive tape of the present invention may have components other than a base material and an adhesive layer. For example, the adhesive tape may have at least one intermediate layer provided between the base material and the adhesive layer.

[0083] Furthermore, each layer constituting the adhesive tape may have a substantially uniform composition throughout, or it may have areas with different compositions. For example, one of the layers constituting the adhesive tape may be a laminate comprising multiple layers having areas with different compositions from each other, or it may be a layer composed of a gradient material whose composition changes in a gradient along the thickness direction. [Examples]

[0084] The present invention will be described in detail below based on specific examples, but the present invention is not limited thereto. In the following description, processes for which temperature conditions are not specifically indicated were performed at room temperature (23°C) and relative humidity of 50%. Similarly, for various measurement conditions for which temperature conditions are not specifically indicated, the values ​​are for room temperature (23°C) and relative humidity of 50%.

[0085] [3] Manufacturing of adhesive tape for capsule containers (Example 1) An olefin-based adhesive composition was obtained by melt-kneading each component at 160°C so that, on a solid content basis, the base polymer consisted of 30 parts by mass of olefin-based elastomer (ethylene-α-olefin copolymer (manufactured by Sumitomo Chemical Co., Ltd., "Excellen® FX307")), the tackifier consisted of 40 parts by mass of fully hydrogenated petroleum resin (manufactured by Arakawa Chemical Industries, Ltd., "Alcon P-100"), and the plasticizer consisted of 30 parts by mass of process oil (manufactured by Idemitsu Kosan Co., Ltd., "Diana Fresia"), respectively. The total amount of adhesive, tackifier, and plasticizer in the olefin-based adhesive composition was 100 parts by mass.

[0086] Next, the olefin-based adhesive composition obtained above was melt-coated onto a transparent biaxially oriented polypropylene substrate with a thickness of 50 μm at 160°C to form a coating film with a thickness of 20 μm. By cooling the coating film, an adhesive sheet was obtained in which an adhesive layer was formed on one side of the substrate.

[0087] (Examples 2-7 and Comparative Examples 1 and 2) An adhesive sheet was obtained in the same manner as in Example 1, except that the types and thicknesses of the components used were adjusted to achieve the configuration shown in Table 1.

[0088] Table 1 summarizes the composition of the adhesive sheets for each example and comparative example. In Table 1, the olefin-based polymer is denoted as "POE-1" for the olefin-based elastomer (ethylene-α-olefin copolymer (manufactured by Sumitomo Chemical Co., Ltd., "[Excellen® VL / FX] series")), the styrene-based polymer is denoted as "TPS-1" for the styrene-based elastomer (styrene-butadiene-styrene block copolymer (manufactured by Asahi Kasei Corporation, "[Asaprene® T] series")), the styrene-based polymer is denoted as "TPS-2" for the styrene-based elastomer (styrene-isoprene-styrene block copolymer (manufactured by Nippon Zeon Co., Ltd., "[Quintac®] series")), and the acrylic emulsion (manufactured by Toagosei Co., Ltd., "HV-C9500") is denoted as "Ac-1" for the acrylic adhesive. In addition, transparent biaxially oriented polypropylene as the substrate is denoted as "OPP", and polyethylene as the substrate is denoted as "PE".

[0089] [4] Rating The adhesive tapes of each of the above-mentioned embodiments and comparative examples were evaluated as follows.

[0090] [4-1] Sealing property The adhesive tapes from each of the above examples and comparative examples were cut to a size of 15 mm wide x 30 mm long to prepare test pieces. Next, a capsule container consisting of an upper container body and a lower container body as shown in Figure 1 was prepared, sealed without contents, and the test piece was attached to the boundary between the upper and lower container bodies. The capsule container was made of polypropylene and had a diameter of 65 mm. The sealed capsule container was dropped 1 m from the ground 10 times, and the condition of the capsule container was checked and evaluated based on the following criteria.

[0091] A: The upper and lower containers did not separate. C: The main container and the lower container separated.

[0092] [4-2] Recyclability First, crushed flakes consisting only of transparent polypropylene capsule containers were prepared. These crushed flakes were pelletized using a twin-screw extruder set to a molding temperature of 210°C, and test specimens measuring 5 cm × 5 cm × 1 mm were prepared from the resulting pellets, and the initial haze value was measured. Next, crushed flakes were prepared such that the blend ratio of the transparent polypropylene capsule containers to the tapes of each example and comparative example was 95:5 (mass%), and test specimens were prepared using the same procedure, and the haze value was measured. The rate of change in the haze value was checked and evaluated based on the following criteria. The smaller the haze change, the better the recyclability.

[0093] A: Haze change is less than 5% B: Haze change is between 5% and 10% C: Haze change is 10% or more

[0094] These results, along with the configuration of the adhesive tapes for each of the above embodiments and comparative examples, are summarized in Table 1.

[0095] [Table 1]

[0096] As is clear from Table 1, the adhesive tapes of each of the above embodiments exhibited excellent recyclability. Furthermore, the adhesive tapes of each of the above embodiments also exhibited excellent sealing properties. In contrast, satisfactory results could not be obtained with the adhesive tapes of each comparative example.

[0097] Furthermore, when adhesive sheets manufactured in the same manner as in the above-described examples and comparative examples were evaluated in the same manner as described above, except that the size of the capsule container was varied within the range of 48 mm to 90 mm, the same results as described above were obtained. [Explanation of Symbols]

[0098] 10: Adhesive tape for capsule containers (adhesive tape) 11: Base material 12: Adhesive layer 30: Goods 31:Contents 32: Packaging material 50: Capsule container 51: Upper container body 52: Lower container body 53: Boundary 55 :Aperture 56:Open end 57 :Aperture 58:Open end 59: Outer perimeter 100: Capsule toys

Claims

1. An adhesive tape used for capsule containers containing polyolefin resin material, A substrate containing a polyolefin-based resin material, An adhesive layer is provided on one side of the substrate and comprises at least one selected from the group consisting of olefin-based adhesives and styrene-based adhesives. Adhesive tape for capsule containers having the following properties.

2. The adhesive tape for capsule containers according to claim 1, wherein the adhesive tape for capsule containers is used to seal the capsule containers.

3. The adhesive tape for capsule containers according to claim 1, wherein the adhesive tape for capsule containers is used to fix an article stored in the capsule container to the inner wall of the capsule container.

4. The adhesive tape for capsule containers according to claim 3, wherein the article is a packaging material containing a polyolefin resin material in which the contents are housed.

5. The adhesive tape for capsule containers according to claim 1, wherein the thickness of the substrate is 20 μm or more and 80 μm or less.

6. The adhesive tape for capsule containers according to claim 1, wherein the thickness of the adhesive layer is 5 μm or more and 35 μm or less.

7. The size of the capsule container is 48 mm or more and 90 mm or less in diameter, as described in claim 1, for the adhesive tape for capsule containers.

8. A capsule container containing a polyolefin-based resin material, The article contained in the aforementioned capsule container, An adhesive tape for capsule containers according to any one of claims 1 to 7, A capsule toy that has [something].

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