Laminate and package

Abstract

To provide a package that can prevent the evaporation of its contents when storing food and beverages with volatile components or products containing liquid with volatile components, and a laminate that enables the production of the package.SOLUTION: A laminate includes two or more resin layers. Of the two or more resin layers, at least one resin layer X contains polyolefin and cycloolefin copolymers.SELECTED DRAWING: None

Description

Technical Field

[0001] The present invention relates to a laminate and a package.

Background Art

[0002] In a resin container for accommodating products containing food and drink, products containing liquid components, etc., a barrier property against water vapor (moisture) may be required in order to prevent water vapor from entering from the outside or moisture from evaporating from the contents. Since polyolefins such as polyethylene and polypropylene are themselves difficult to permeate water vapor, a resin layer using these resins can meet the above requirements, but there are also known packages, etc. that impart a water vapor barrier property due to a specific composition (for example, Patent Document 1).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] On the other hand, for products containing alcohol, etc. that are more volatile than water, and food and drink, there is also a demand for a package with a high barrier property to prevent evaporation of the contents, but the conventional packages have not yet been sufficient in terms of such performance. An object of the present invention is to provide a package that can suppress evaporation of the contents when accommodating food and drink containing volatile components or products containing a liquid containing volatile components, and a laminate that can manufacture the package.

Means for Solving the Problems

[0005] According to the present invention, the following laminates, etc. are provided. 1. A laminate including two or more resin layers, Of the two or more resin layers, at least one resin layer X contains a polyolefin and a cycloolefin copolymer. Laminated structure. 2. The laminate according to claim 1, wherein the polyolefin of the resin layer X is one or more selected from polyethylene and polypropylene. 3. The laminate according to claim 1 or 2, wherein the cyclic olefin constituting the cycloolefin copolymer of the resin layer X is one or more selected from norbornene, compounds having a norbornene skeleton, tetracyclododecene, and compounds having a tetracyclododecene skeleton. 4. The laminate according to any one of 1 to 3, wherein the acyclic olefin constituting the cycloolefin copolymer of the resin layer X is one or more selected from ethylene and propylene. 5. The laminate according to any one of 1 to 4, wherein the mass ratio of cyclic olefin to acyclic olefin in the cycloolefin copolymer of the resin layer X is 30 to 90:70 to 10. 6. The laminate according to any one of 1 to 5, wherein the resin layer X contains 30 to 99% by mass of polyolefin and 1 to 70% by mass of cycloolefin copolymer. 7. The laminate according to any one of 1 to 5, wherein the resin layer X contains 40 to 95% by mass of polyolefin and 5 to 60% by mass of cycloolefin copolymer. 8. The laminate according to any one of 1 to 7, wherein the resin layer X consists substantially only of a polyolefin and a cycloolefin copolymer. 9. The laminate according to any one of 1 to 8, wherein at least one of the inner layers whose surface is not exposed to the outside is a resin layer X among the resin layers constituting the laminate. 10. A laminate according to any one of 1 to 9, comprising a base layer, a resin layer X, and a base layer in that order. 11. A laminate according to any one of 1 to 10, comprising an oxygen barrier layer. A laminate according to any one of 1 to 11, comprising 12.1 or two or more adhesive layers. 13. A laminate according to any one of 1 to 12, comprising a base layer, resin layer X, adhesive layer, oxygen barrier layer, adhesive layer, resin layer X, and base layer in this order. 14. A laminate according to any one of 1 to 13, comprising a release layer on its surface. 15. The laminate according to 14, wherein the release layer is a mixed layer of polypropylene and polyethylene. 16. The laminate according to 14, wherein the release layer is a single layer of polyethylene. 17. A laminate according to any one of 14 to 16, wherein the resin layer adjacent to the release layer is a base layer which is a mixed layer of polypropylene and polyethylene. 18. A laminate according to any one of 14 to 17, comprising a release layer, a substrate layer, a resin layer X, an adhesive layer, an oxygen barrier layer, an adhesive layer, a resin layer X, and a substrate layer in this order. A package made using a laminate as described in any of sections 19.1 to 18. 20. The packaging body according to 19, having a flange portion. 21. A packaging according to 19 or 20, for containing food or beverages containing volatile components. 22. A package for containing alcoholic beverages, as described in any of items 19-21. 23. Packaging as described in 19 or 20, for the purpose of containing daily necessities or cosmetics. [Effects of the Invention]

[0006] According to the present invention, a packaging body that can suppress the evaporation of contents when it contains food or beverages containing volatile components or products containing liquids containing volatile components, and a laminate that can be used to manufacture such a packaging body can be provided. [Brief explanation of the drawing]

[0007] [Figure 1] This is a top view (a) and a cross-sectional view (b) of an example of a packaging body according to one aspect of the present invention. [Modes for carrying out the invention]

[0008] The laminate and packaging according to the present invention will be described below. In this specification, "x~y" represents a numerical range of "x or more, y or less". If there are multiple lower limits such as "x or more" or multiple upper limits such as "y or less" with respect to a single technical matter, these upper and lower limits can be arbitrarily selected and combined.

[0009] 1. Laminate A laminate according to one aspect of the present invention comprises two or more resin layers, wherein at least one of the two or more resin layers (hereinafter also referred to as "resin layer X") comprises a polyolefin and a cycloolefin copolymer.

[0010] The above-described laminate, by comprising a resin layer X containing polyolefin and cycloolefin copolymer, exhibits excellent barrier properties against volatile components such as alcohol. As a result, when food and beverages containing volatile components or products containing liquids containing volatile components are stored for a certain period in a package (packaging container) made of this laminate, evaporation of the contents can be minimized, making it possible to maintain the quality of the contents for a long period of time. Furthermore, because the resin layer X contains a cycloolefin copolymer, the laminate as a whole possesses high rigidity. Molded articles (e.g., packaging) obtained from such laminates also exhibit excellent rigidity and are therefore resistant to deformation by external forces. Furthermore, because the resin layer X is not composed solely of cycloolefin copolymer, but is a mixed layer of cycloolefin copolymer and polyolefin, the laminate possesses both excellent appearance and high moldability. If the resin layer X were composed solely of cycloolefin copolymer, there would be concerns about defects such as poor appearance of the laminate and difficulty in molding the laminate; however, these concerns can be resolved by using polyolefin in combination. The following describes the various components of the above-mentioned laminate.

[0011] (Resin layer X) There are no particular restrictions on the arrangement of the resin layer X in the laminate, and it may be used as any layer. In one embodiment, when the laminate is used as a packaging body, the resin layer on the surface in contact with the contents is not the resin layer X. In one embodiment, the resin layers on the front and back surfaces of the laminate are not the resin layer X, and at least one of the inner layers whose surfaces are not exposed to the outside is the resin layer X.

[0012] The resin layer X is not particularly limited as long as it is a resin layer containing a polyolefin and a cycloolefin copolymer. There are no particular restrictions on the polyolefin, and for example, polyethylene, polypropylene, polybutene, etc. can be used. In one embodiment, one or more selected from polyethylene and polypropylene are used as the polyolefin. As the polyethylene, low-density polyethylene (LDPE), high-density polyethylene (HDPE), linear ethylene-α-olefin copolymer, etc. can be used. As the polypropylene, homopolypropylene (hPP), random polypropylene (rPP), block polypropylene, etc. can be used.

[0013] Also, when considering environmental compatibility, a biomass-derived resin (biomass plastic) may be used as the polyolefin. Examples of the biomass plastic include biopolypropylene, bioethylene, etc. As the polyolefin, a resin derived from fossil fuel and a biomass plastic may be used in combination. Note that, as part or all of the other resin components (cycloolefin copolymer and resin components of "other components" described later) in the resin layer X, and part or all of the resin components constituting each layer other than the resin layer X of the laminate according to one aspect of the present invention, a biomass plastic may be used.

[0014] The cycloolefin copolymer is a copolymer of a cyclic olefin (also referred to as a cycloalkene or cycloolefin) monomer and an acyclic olefin monomer.

[0015] Examples of cyclic olefins include the compounds shown below, and one or more of these may be used as monomers. Note that the structural formulas below show only the skeleton of the cyclic olefin, and substituents (e.g., alkyl groups having 1 to 30 carbon atoms) may be present at substituted positions. [ka]

[0016] In one embodiment, the cyclic olefin is one or more selected from norbornene, compounds having a norbornene skeleton, tetracyclododecene (dimethanooctahydronaphthalene), and compounds having a tetracyclododecene skeleton.

[0017] Examples of acyclic olefins include ethylene, propylene, and butene, and one or more of these may be used. In one embodiment, the acyclic olefin is one or more selected from ethylene and propylene.

[0018] In one embodiment, the cycloolefin copolymer is a copolymer comprising norbornene or a compound having a norbornene skeleton as a cyclic olefin and ethylene or propylene as an acyclic olefin.

[0019] In cycloolefin copolymers, the monomer ratios of each monomer are, for example, cyclic monomer:acyclic olefin monomer (mass ratio) = 30-90:70-10, 40-85:60-15, and 55-80:45-20.

[0020] The cycloolefin copolymer may also be a hydrogenated product. Commercially available cycloolefin copolymers can be used, such as TOPAS® manufactured by Polyplastics Co., Ltd. or Apel® manufactured by Mitsui Chemicals, Inc.

[0021] The polyolefin content in the resin layer X is, for example, 30% by mass or more, 40% by mass or more, or 50% by mass or more, and for example, 99% by mass or less, 95% by mass or less, or 90% by mass or less. The content of cycloolefin copolymer in the resin layer X is, for example, 1% by mass or more, 5% by mass or more, or 10% by mass or more, and for example, 70% by mass or less, 60% by mass or less, or 50% by mass or less. When the content of each component in resin layer X is within the range described above, the effects of improving the appearance of the laminate and improving its moldability are more significant.

[0022] In one embodiment, the mass ratio of polyolefin to cycloolefin copolymer in the resin layer X is 30-99:1-70, 40-95:5-60, or 50-90:10-50.

[0023] The resin layer X may or may not contain other components in addition to the polyolefin and cycloolefin copolymer described above. Examples of other components include resins such as thermoplastic resins, additives such as antioxidants, lubricants, and antistatic agents, and colorants.

[0024] In one embodiment, the resin layer X consists only of a polyolefin and a cycloolefin copolymer, or substantially only of these. In the latter case, it may contain unavoidable impurities. In one embodiment, 80% or more by mass of the resin layer X is a polyolefin and cycloolefin copolymer, 90% or more by mass, 95% or more by mass, 99% or more by mass, 99.9% or more by mass, or 100% by mass.

[0025] In one embodiment, the resin layer X does not contain inorganic fillers such as talc. In one embodiment, the resin layer X does not contain petroleum resin. In one embodiment, the resin layer X does not contain a thermoplastic elastomer.

[0026] There are no particular restrictions on the thickness of the resin layer X, but for example, it can be 100-800 μm, 150-650 μm, or 200-700 μm. The ratio of the thickness of the resin layer X to the total thickness of the laminate is, for example, 30% or more, or 40% or more, and for example, 70% or less, or 60% or less.

[0027] (Laminated structure) A laminate according to one aspect of the present invention is a laminated structure of two or more layers, comprising at least one resin layer X. The laminate is not particularly limited as long as it contains a resin layer X, and may be a laminated structure of two or three or more layers, or may contain multiple resin layers X. When multiple resin layers X are included, the compositions of the multiple resin layers X may be the same or different. Also, the thicknesses of the multiple resin layers X may be the same or different.

[0028] In one embodiment, the laminate includes one or more base layers, and at least one of these base layers is a resin layer X. Hereinafter, the base layer that is the resin layer X will also be referred to as the "first base layer," and the other base layers will also be referred to as the "second base layer."

[0029] There are no particular restrictions on the material of the second base layer, but polyolefins are usually used, for example, polyethylene or polypropylene can be used. As polyethylene, low-density polyethylene (LDPE), high-density polyethylene (HDPE), linear ethylene-α-olefin copolymer, etc. can be used. As polypropylene, homopolypropylene (hPP), random polypropylene (rPP), block polypropylene, etc. can be used. The second base layer may be a layer made of one of the above resins alone, or it may be a mixed layer of two or more types.

[0030] There are no particular restrictions on the thickness of the second base layer, but it should be, for example, 50% or less, 40% or less, or 35% or less of the total thickness of the laminate. For example, if the total thickness of the laminate is 1000 μm, then the second base layer should be 500 μm or less, 400 μm or less, or 350 μm or less. There are also no particular restrictions on the lower limit of the thickness, and it may be greater than 0%, 1% or more, 5% or more, 10% or more, or 20% or more of the total thickness of the laminate. The thickness of the second substrate layer is, for example, 50 to 500 μm, or 100 to 400 μm.

[0031] The laminate may contain multiple second base layers. If it contains multiple second base layers, the compositions of the multiple second base layers may be the same or different. Also, the thicknesses of the multiple second base layers may be the same or different.

[0032] Other layers used in a laminate according to one aspect of the present invention include, for example, an oxygen barrier layer, an adhesive layer, and a release layer. In one embodiment, the laminate includes one or more layers selected from the group consisting of an adhesive layer and an oxygen barrier layer.

[0033] The oxygen barrier layer is a layer that possesses oxygen barrier properties, and when used as a container, it can suppress the oxidative degradation of the contents. Examples of materials used in the oxygen barrier layer include ethylene vinyl alcohol copolymer resin (EVOH), MX nylon (MXNy), polyvinylidene chloride resin (PVDC), and polyacrylonitrile resin (PAN). One of these may be used alone, or two or more may be used in combination. Furthermore, the oxygen barrier layer can also be formed by a coating method. In this case, the materials that can be used include, for example, inorganic materials such as silica, alumina, aluminum, and silicon nitride; organic materials such as polyvinyl alcohol (PVA); and organic-inorganic hybrid materials such as silica / PVA, selected from the group of materials that can be used.

[0034] The thickness of the oxygen barrier layer is typically 1 μm or more, preferably 5 μm or more. It is also typically 150 μm or less, preferably 130 μm or less. In a laminate according to one aspect of the present invention, a plurality of oxygen barrier layers may be provided. When a plurality of oxygen barrier layers are included, the compositions of the plurality of oxygen barrier layers may be the same or different. Furthermore, the thicknesses of the plurality of oxygen barrier layers may be the same or different.

[0035] The adhesive layer is a layer used as needed to improve the adhesion between each layer of the multilayer sheet. Examples of usable materials include urethane elastomers, styrene elastomers, maleic anhydride-modified polyethylene, maleic anhydride-modified polypropylene, or ethylene vinyl acetate (EVA), with maleic anhydride-modified polypropylene being preferred.

[0036] The thickness of the adhesive layer is usually 1 μm or more, preferably 3 μm or more. It is also usually 20 μm or less, preferably 10 μm or less. In a laminate according to one aspect of the present invention, a plurality of adhesive layers may be provided. When a plurality of adhesive layers are included, the compositions of the plurality of adhesive layers may be the same or different. Furthermore, the thicknesses of the plurality of adhesive layers may be the same or different.

[0037] The release layer (also called the "release function layer") is typically provided on the outermost layer that comes into contact with the contents when the laminate is used as packaging. The release layer is, for example, a layer on which a lid material (the "lid material" will be described in detail later) attached by heat sealing or the like is easily peeled off. The ease of peeling of the release layer may be achieved by cohesive peeling of the release layer, or by peeling of the release layer from the underlying layer (interlaminar delamination).

[0038] There are no particular restrictions on the material of the release layer, but polyolefins are usually used, for example, polyethylene or polypropylene can be used. As for polyethylene, low-density polyethylene (LDPE), high-density polyethylene (HDPE), linear ethylene-α-olefin copolymer, etc. can be used. As for polypropylene, homopolypropylene (hPP), random polypropylene (rPP), block polypropylene, etc. can be used. The release layer may be a layer made of one of the above resins alone, or it may be a mixed layer of two or more resins.

[0039] In one embodiment, the release layer may be a mixed layer of polypropylene and polyethylene, where the polypropylene content is, for example, 60 to 80% by mass, and the polyethylene content is, for example, 20 to 40% by mass. In this case, the release layer may be a mixed layer of, for example, homopolypropylene (hPP), random polypropylene (rPP), and low-density polyethylene (LDPE). When the above configuration is adopted as the release layer, a second base layer, which is a mixed layer of polypropylene and polyethylene, may be used as the resin layer located beneath it, with the polypropylene content being, for example, 70 to 90% by mass, and the polyethylene content being, for example, 10 to 30% by mass. In this case, the second base layer may be, for example, a mixed layer of homopolypropylene (hPP) and low-density polyethylene (LDPE). With the above configuration, the peeling layer is more likely to undergo cohesive peeling, resulting in excellent peelability.

[0040] In one embodiment, the release layer may be a single layer of polyethylene only, or for example, a resin layer made only of high-density polyethylene (HDPE). When the above configuration is adopted as the release layer, a second base layer, which is a mixed layer of polypropylene and polyethylene, may be used as the resin layer located beneath it, with the polypropylene content being, for example, 70 to 90% by mass, and the polyethylene content being, for example, 10 to 30% by mass. In this case, the second base layer may be, for example, a mixed layer of homopolypropylene (hPP), low-density polyethylene (LDPE), and high-density polyethylene (HDPE). With the above configuration, the delamination layer becomes more prone to interlayer delamination, resulting in excellent delamination properties.

[0041] In one embodiment, the laminate does not contain a layer containing a metal component.

[0042] An example of a laminated structure for a multilayer sheet according to one aspect of the present invention is the structure shown below. (1) Second base layer / first base layer (resin layer X) (2) Second base material layer / first base material layer (resin layer X) / second base material layer (3) Second base layer / First base layer (resin layer X) / Oxygen barrier layer / First base layer (resin layer X) / Second base layer (4) Second base layer / First base layer (resin layer X) / Adhesive layer / Oxygen barrier layer / Adhesive layer / First base layer (resin layer X) / Second base layer (11) Release layer / First substrate layer (resin layer X) (12) Release layer / Second base layer / First base layer (Resin layer X) (13) Release layer / Second base layer / First base layer (resin layer X) / Second base layer (14) Release layer / Second base layer / First base layer (resin layer X) / Oxygen barrier layer / First base layer (resin layer X) / Second base layer (15) Release layer / Second base layer / First base layer (resin layer X) / Adhesive layer / Oxygen barrier layer / Adhesive layer / First base layer (resin layer X) / Second base layer (The " / " symbol indicates the layer interface.)

[0043] In one embodiment, the thickness of the laminate is, for example, 100 μm or more, 150 μm or more, 200 μm or more, or 350 μm or more, and for example, 2500 μm or less, 2000 μm or less, 1500 μm or less, or 1200 μm or less.

[0044] The method for manufacturing the laminate according to one aspect of the present invention is not particularly limited. The above-mentioned resin layers may be formed by simultaneous extrusion, or, for example, an oxygen barrier layer or the like may be formed by a coating method.

[0045] 2.Packaging A package (e.g., a packaging container) according to one aspect of the present invention is composed of a laminate according to the above-described aspect of the present invention. Figure 1 illustrates a packaging according to one aspect of the present invention. The container 1 has a flange portion 3 that surrounds the storage portion 2 in the container 1. A lid material (not shown) can be attached to the upper surface of the flange portion 3, thereby sealing any contents enclosed in the storage portion 2. The shape of the packaging is not limited to the example in Figure 1; the container's compartment can be circular, square, oval, or any other shape. A bag-like shape is also acceptable.

[0046] The material of the lid material attached to the flange of the packaging is not particularly limited and may be, for example, a film (resin film). For example, by using a laminate film as the lid material, it can be attached to the flange of the packaging by heat sealing or the like. By peeling the lid material from the flange of the packaging, the packaging can be opened and the contents can be removed from the packaging.

[0047] The method for manufacturing a packaging body according to one aspect of the present invention is not particularly limited. For example, a method of molding a laminate according to one aspect of the present invention can be used, such as vacuum forming, pressure forming, vacuum pressure forming, or injection molding. Vacuum forming and vacuum pressure forming are preferred.

[0048] 3. Uses of packaging A packaging material according to one aspect of the present invention can be used as a packaging material for food and beverages, daily necessities, pharmaceuticals, medical products, cosmetics, industrial materials, electronic components, etc. In one embodiment, the packaging is for containing food or beverages that contain volatile components such as alcohol as their contents, for example, it is for containing alcoholic beverages. In one embodiment, the packaging is for a product containing a liquid with volatile components such as alcohol or acetone as its contents, and is, for example, for a product containing alcohol wipes (e.g., alcohol disinfectant wipes) or nail polish remover. [Examples]

[0049] Examples of the present invention will be described below, but the present invention is not limited to these examples.

[0050] The materials used in the examples and comparative examples are as follows: <Polypropylene> hPP1: Homopolypropylene (commercial product, melt flow rate (MFR) = 0.5g / 10min) rPP1: Random polypropylene (commercial product, melt flow rate (MFR) = 2g / 10min) <Polyethylene> LDPE1: Low-density polyethylene (commercial product, melt flow rate (MFR) = 4.5g / 10min) LDPE2: Low-density polyethylene (commercial product, melt flow rate (MFR) = 0.35 g / 10 min) HDPE1: High-density polyethylene (commercial product, melt flow rate (MFR) = 13g / 10min) HDPE2: High-density polyethylene (commercial product, melt flow rate (MFR) = 0.35g / 10min) <Cycloolefin copolymer> COC1: Copolymer of norbornene and ethylene (commercial product, melt flow rate (MFR) = 2g / 10min, monomer ratio (mass ratio) of norbornene monomer to ethylene monomer = 60:40)

[0051] Example 1 (1) Manufacturing of laminates A laminate consisting of three layers—a first layer (thickness 50 μm), a second layer (thickness 200 μm), and a third layer (thickness 300 μm)—was manufactured using a distributor-type co-extrusion multilayer sheet manufacturing apparatus. The structure of each layer is as follows: First layer (extraction layer): Mixed layer of hPP1 (50% by mass), rPP1 (20% by mass), and LDPE1 (30% by mass). Second layer (second base layer): Mixed layer of hPP1 (80% by mass) and LDPE2 (20% by mass). Third layer (first base layer): Mixed layer of hPP1 (80% by mass) and COC1 (20% by mass)

[0052] (2) Evaluation of the laminate The following evaluations were performed on the obtained laminate. The results are shown in Table 1. (i) Evaporation suppression effect of beverages containing volatile components A laminate was vacuum-formed to obtain a container (packaging) with a roughly cylindrical recess. When viewed from above, the recess has a pear shape with a maximum horizontal length of 34 mm and a maximum vertical length of 42 mm, and a maximum height (depth) of 18 mm. The container is also provided with a flange surrounding the recess. 5 mL of commercially available whiskey (White Horse: 40% ABV) was filled into the container, a lid material was adhered to the flange, and the recess was sealed with the lid material. The container was then stored for two weeks in a high-temperature, low-humidity environment (40°C, 28% RH). The mass was measured before and after storage, and the amount of whiskey evaporated (%) was calculated using the following formula. Whiskey evaporation rate (%) = [{(Mass of the whiskey container before storage) - (Mass of the whiskey container after storage)} / (Mass of the whiskey container before storage)] × 100

[0053] (ii) Stiffness (tensile modulus) The tensile modulus was measured in accordance with JIS K 7161. The measurement was performed in the extrusion direction (MD direction).

[0054] Example 2 In the third layer, the laminate was manufactured and evaluated using the same method as in Example 1, except that the proportion of COC1 was set to 40% by mass and the proportion of hPP1 was set to 60% by mass. The results are shown in Table 1.

[0055] Comparative Example 1 The laminate was manufactured and evaluated using the same method as in Example 1, except that LDPE2 was used instead of COC1 in the third layer. The results are shown in Table 1.

[0056] [Table 1]

[0057] Example 3 A laminate consisting of three layers—a first layer (thickness 10 μm), a second layer (thickness 240 μm), and a third layer (thickness 300 μm)—was manufactured using a distributor-type co-extrusion multilayer sheet manufacturing apparatus. The structure of each layer is as follows: First layer (release layer): HDPE1 (100% by mass) Second layer (second base layer): Mixed layer of hPP1 (80% by mass), LDPE2 (11% by mass), and HDPE2 (9% by mass). Third layer (first base layer): Mixed layer of hPP1 (80% by mass) and COC1 (20% by mass) The resulting laminate was evaluated using the same method as in Example 1. The results are shown in Table 2.

[0058] Example 4 In the third layer, the laminate was manufactured and evaluated using the same method as in Example 3, except that the proportion of COC1 was set to 40% by mass and the proportion of hPP1 was set to 60% by mass. The results are shown in Table 2.

[0059] Comparative Example 2 The laminate was manufactured and evaluated using the same method as in Example 3, except that LDPE2 was used instead of COC1 in the third layer. The results are shown in Table 2.

[0060] [Table 2]

[0061] (1) From Tables 1 and 2, it can be seen that the packaging obtained from the laminate of the present invention having a cycloolefin copolymer-containing layer has a low evaporation rate of contents and a high evaporation suppression effect for alcoholic beverages. In particular, in Example 2, the evaporation rate was reduced to about half that of Comparative Example 1, and it can be seen that approximately twice the barrier performance was achieved. The same is true when comparing Example 3 and Comparative Example 2. (2) From Tables 1 and 2, it can be seen that the laminate of the present invention having a cycloolefin copolymer-containing layer has a higher tensile modulus and higher rigidity compared to the laminates of Comparative Examples 1 and 2. (3) In Examples 1 to 4, the appearance of the obtained laminates was comparable to that of the laminates of Comparative Examples 1 and 2, which did not contain cycloolefin copolymers, and was good. Furthermore, when molding the containers for evaluation (i) using the laminates of Examples 1 to 4, there were no problems with moldability, and the appearance of the obtained containers was also good. (4) In Examples 1 and 2, when the lid material was removed from the container prepared in (i) evaluation, the release layer underwent cohesive delamination, resulting in excellent release properties. In Examples 3 and 4, when the lid material was removed from the container prepared in (i) evaluation, the release layer underwent interlayer delamination, resulting in excellent release properties. [Industrial applicability]

[0062] A packaging according to one aspect of the present invention can be used for packaging food and beverages, daily necessities, pharmaceuticals, medical products, cosmetics, industrial materials, electronic components, and the like. [Explanation of symbols]

[0063] 1: Container 2: Containment area 3: Flange section

Claims

1. A laminate including two or more resin layers, At least one resin layer X of the two or more resin layers contains a polyolefin and a cycloolefin copolymer; Laminate.

2. The laminate according to claim 1 , wherein the polyolefin of the resin layer X is at least one selected from the group consisting of polyethylene and polypropylene.

3. 3. The laminate according to claim 1, wherein the cyclic olefin constituting the cycloolefin copolymer of the resin layer X is one or more selected from norbornene, a compound having a norbornene skeleton, tetracyclododecene, and a compound having a tetracyclododecene skeleton.

4. 3. The laminate according to claim 1, wherein the non-cyclic olefin constituting the cycloolefin copolymer of the resin layer X is at least one selected from the group consisting of ethylene and propylene.

5. 3. The laminate according to claim 1, wherein the mass ratio of cyclic olefin to non-cyclic olefin in the cycloolefin copolymer of the resin layer X is 30-90:70-10.

6. 3. The laminate according to claim 1, wherein the content of the polyolefin in the resin layer X is 30 to 99% by mass, and the content of the cycloolefin copolymer in the resin layer X is 1 to 70% by mass.

7. 3. The laminate according to claim 1, wherein the content of the polyolefin in the resin layer X is 40 to 95% by mass, and the content of the cycloolefin copolymer in the resin layer X is 5 to 60% by mass.

8. 3. The laminate according to claim 1, wherein the resin layer X consists essentially of a polyolefin and a cycloolefin copolymer.

9. 3. The laminate according to claim 1, wherein at least one of the inner layers, the surface of which is not exposed to the outside, among the resin layers constituting the laminate is a resin layer X.

10. The laminate according to claim 1 or 2, comprising a substrate layer, a resin layer X, and a substrate layer in this order.

11. 3. The laminate of claim 1 or 2, comprising an oxygen barrier layer.

12. 3. The laminate of claim 1 or 2, comprising one or more adhesive layers.

13. 3. The laminate according to claim 1, comprising, in this order, a substrate layer, a resin layer X, an adhesive layer, an oxygen barrier layer, an adhesive layer, a resin layer X, and a substrate layer.

14. The laminate according to claim 1 or 2, which comprises a release layer on a surface thereof.

15. 15. The laminate of claim 14, wherein the release layer is a blend of polypropylene and polyethylene.

16. 15. The laminate of claim 14, wherein the release layer is a single layer of polyethylene.

17. The laminate according to claim 14 , further comprising a base layer which is a mixed layer of polypropylene and polyethylene as a resin layer adjacent to the release layer.

18. 15. The laminate of claim 14, comprising, in this order, a release layer, a substrate layer, a resin layer X, an adhesive layer, an oxygen barrier layer, an adhesive layer, a resin layer X, and a substrate layer.

19. A package produced using the laminate according to claim 1 or 2.

20. 20. The package of claim 19 having a flange.

21. 20. The package of claim 19 for containing food or drink containing volatile components.

22. 20. The package of claim 19 for containing alcoholic beverages.

23. 20. The package of claim 19, for containing daily necessities or cosmetics.

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