Laminate for packaging material, packaging container and packaging article

Abstract

To provide laminates for packaging materials, packaging containers and packaging articles that can improve hygiene and quality even when the content rate of recycled resin is sufficiently high.SOLUTION: In a laminate for packaging materials that has an outer layer base material and a sealant layer, the sealant layer is a polyolefin resin film that contains recycled resin, the content of the recycled resin in the laminate for packaging materials is 10% by volume or more, or 10% by mass or more, and the recycled resin is chemical recycled resin.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present disclosure relates to a laminate for packaging materials, a packaging container, and a packaging article. [Background technology]

[0002] Packaging materials used in packaging bags and the like are required to have various properties depending on the application. Therefore, in order to simultaneously satisfy such various performance requirements, the packaging material is generally composed of a laminate including an outer layer base material and a sealant layer. Known examples of such laminates for packaging materials include a laminate including a first layer including an inner liner and a second layer including an outer sheath, where the outer sheath is made of post-consumer resin (hereinafter also referred to as "PCR") that may contain contaminants such as paper, ink, and food residues (see, for example, Patent Document 1 below). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Special Publication No. 2022-552096 Summary of the Invention [Problem to be solved by the invention]

[0004] However, the laminate described in Patent Document 1 above has the following problems when the PCR content is increased in the case where the PCR is a recycled resin containing contaminants, that is, a so-called material recycled resin. That is, in the laminate described in Patent Document 1, foreign matter such as impurities, gels, and aggregates may appear on the surface, and there is room for improvement in terms of hygiene. Furthermore, in the laminate described in Patent Document 1, odorous components generated due to thermal degradation of the polyolefin resin were detected, and there was also room for improvement in terms of quality.

[0005] An object of the present disclosure is to provide a laminate for packaging materials, a packaging container, and a packaging article that can improve hygiene and quality even when the content of recycled resin is sufficiently high. [Means for solving the problem]

[0006] One aspect of the present disclosure provides a laminate for packaging materials comprising an outer layer base material and a sealant layer, wherein the sealant layer is a polyolefin resin film containing a recycled resin, the content of the recycled resin in the laminate for packaging materials is 10% by volume or more or 10% by mass or more, and the recycled resin is a chemically recycled resin. According to the above-mentioned laminate for packaging material, the sealant layer is required to have particularly high hygiene and quality since it comes into contact with the contents contained in the packaging container obtained by using the laminate for packaging material. In contrast, in the laminate for packaging material of the present disclosure, the recycled resin of the polyolefin resin film used as the sealant layer is a chemically recycled resin, which is a recycled resin produced by once reducing the molecular weight of a discarded resin through a process performed according to the material characteristics, such as a process of monomerizing the resin via gasification, oilification, and refined naphtha, or a process of monomerizing the resin by depolymerization, and then polymerizing the resin. For this reason, the chemically recycled resin is less likely to be mixed with foreign matter such as impurities, gels, and aggregates, compared with the material recycled resin, which is a resin obtained by cleaning and crushing a resin product such as a recovered used packaging material, and then melting the resin product with heat to recycle it into a raw material. In addition, unlike the material recycled resin, the chemically recycled resin is not affected by heat treatment such as melting after the recycling process, and is therefore less likely to be thermally deteriorated. Therefore, it is possible to achieve both improved hygiene and quality by making the content of recycled resin in the packaging laminate 10% by volume or more or 10% by mass or more. That is, the packaging laminate of the present disclosure can improve hygiene and quality even if the content of recycled resin is sufficiently high.

[0007] The higher the content (usage ratio) of recycled resin in the laminate for packaging material, the more the environmental load can be reduced, and the content of recycled resin is preferably 20% by mass or more, more preferably 25% by mass or more, even more preferably 30% by mass or more, and particularly preferably 40% by mass or more. Here, if it is not easy to calculate the mass ratio (mass%) after the laminate for packaging material is made into a packaging material, the unit of the content of recycled resin may be "volume %" so that it can be calculated by the film thickness ratio. In other words, the ratio of the film thickness of the layer using recycled resin to the film thickness of the entire laminate can be used as the content of recycled resin (volume %). The density of polyethylene and polypropylene that constitute most of the packaging material is 0.86 to 0.97 g / cm 3 The range of the recycled resin content specified in volume percent generally satisfies the value specified in mass percent. That is, the recycled resin content in the packaging laminate is preferably 20 volume percent or more, more preferably 25 volume percent or more, even more preferably 30 volume percent or more, and particularly preferably 40 volume percent or more.

[0008] In the above-mentioned laminate for packaging material, the thickness of the sealant layer may be greater than the thickness of the outer layer base material, and the content of the recycled resin in the sealant layer may be 20% by volume or more or 20% by mass or more. In the above-mentioned laminate for packaging material, the sealant layer accounts for a large proportion of the laminate for packaging material, and by using a polyolefin resin film containing recycled resin as the sealant layer, the content of recycled resin can be easily increased.

[0009] The above-mentioned packaging laminate may further comprise an intermediate substrate between the outer layer substrate and the sealant layer. In this case, the outer layer base material is reinforced by the intermediate base material, thereby making it possible to further improve the strength of the laminate.

[0010] In the laminate for packaging materials, the recycled resin may be a post-consumer recycled resin (PCR). PCR can reduce the cost of laminates because large quantities are available on the market. The recycled resin may be a combination of PCR and post-industrial recycled resin (PIR).

[0011] The above-mentioned packaging laminate may further comprise a gas barrier layer between the outer layer base material and the sealant layer. In this case, the gas barrier property of the laminate is further improved, so that when the laminate is used to produce a packaging container and contents are placed in the packaging container, deterioration of the contents due to gases such as oxygen can be effectively suppressed.

[0012] The packaging material laminate may further include a second sealant layer on the surface of the outer layer base material opposite to the sealant layer. This packaging laminate is suitable as a packaging material for producing tube containers. The above-mentioned packaging material laminate further includes an adhesive layer between the outer layer base material and the sealant layer, and the adhesive layer is an adhesive layer formed using an adhesive, and the adhesive may be a urethane-based adhesive, a polyester-based adhesive, a polyamide-based adhesive, an epoxy-based adhesive, or an isocyanate-based adhesive.

[0013] Another aspect of the present disclosure provides a packaging container obtained by using the above-mentioned laminate for packaging materials. According to the above packaging container, as already described, in the packaging laminate, a polyolefin resin film containing a recycled resin is used as a sealant layer, and the recycled resin is a chemically recycled resin, which is less likely to be mixed with foreign matter such as impurities, gels, and aggregates than material recycled resin. In addition, unlike material recycled resin, chemically recycled resin is not affected by heat treatment such as heat melting after the recycling process, so it is less likely to be thermally deteriorated. Therefore, the packaging container obtained by using the above packaging laminate can safely contain contents such as food even if the content of the recycled resin in the packaging laminate is sufficiently high to 10% by volume or more or 10% by mass or more. In addition, since the quality of the packaging laminate can be improved, the packaging container obtained by using the packaging laminate can have improved properties such as strength.

[0014] Yet another aspect of the present disclosure provides a packaging article comprising the above-described packaging container and a content contained within the packaging container. According to the above-mentioned packaging article, as already described, the chemically recycled resin as the recycled resin contained in the sealant layer of the laminate is less likely to be mixed with foreign matter such as impurities, gels, and aggregates than the materially recycled resin. Moreover, unlike the materially recycled resin, the chemically recycled resin is not affected by heat treatment such as heat melting after the recycling process, and is therefore less likely to undergo thermal degradation. Therefore, the above-mentioned packaging article can be safely stored with the contents such as food contained therein even if the content of the recycled resin in the packaging laminate is sufficiently increased to 10% by volume or more or 10% by mass or more. Furthermore, since the quality of the packaging laminate can be improved, the packaging article equipped with a packaging container obtained using the packaging laminate can have improved properties such as strength. Effect of the Invention

[0015] According to the present disclosure, there are provided a laminate for packaging materials, a packaging container, and a packaging article that can improve hygiene and quality even when the content of recycled resin is sufficiently high. [Brief description of the drawings]

[0016] [Figure 1] FIG. 1 is a cross-sectional view showing one embodiment of a packaging laminate according to the present disclosure. [Diagram 2] FIG. 2 is a cross-sectional view showing another embodiment of the packaging laminate according to the present disclosure. [Diagram 3] FIG. 3 is a cross-sectional view showing another embodiment of the packaging material laminate according to the present disclosure. [Figure 4] FIG. 4 is a cross-sectional view of one embodiment of a packaging article according to the present disclosure. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0017] Hereinafter, preferred embodiments of the present disclosure will be described in detail. In the drawings, the same or corresponding parts are denoted by the same reference numerals, and duplicated explanations will be omitted.

[0018] <Laminated body for packaging materials> First, an embodiment of the packaging laminate according to the present disclosure will be described with reference to Figures 1 to 3. Figures 1 to 3 are cross-sectional views showing various embodiments of the packaging laminate according to the present disclosure.

[0019] As shown in FIG. 1, a laminate for packaging material (hereinafter also referred to as “laminate”) 100 includes an outer layer base material 10 and a sealant layer 30. The laminate 100 may further include an intermediate substrate 20 between the outer layer substrate 10 and the sealant layer 30 . The content of recycled resin in the packaging laminate 100 is 10% by volume or more or 10% by mass or more. Here, the sealant layer 30 is made of a polyolefin resin film containing recycled resin, and the recycled resin is a chemically recycled resin.

[0020] The laminate 100 may further include a printed layer 50 as shown in FIG. As shown in FIG. 2, the laminate 100 may further include a gas barrier layer 60 together with the printed layer 50, or may further include the gas barrier layer 60 instead of the printed layer 50. When the laminate 100 is used for a tube container, as shown in FIG. 3, the laminate 100 may further include a second sealant layer 40 on the side of the outer layer base material 10 opposite the sealant layer 30 .

[0021] According to the laminate 100, even if the content of recycled resin is made sufficiently high, hygiene and quality can be improved.

[0022] (Outer layer base material) The outer layer substrate 10 may be a film substrate made of a resin material. Examples of such resin materials include polyester films such as polyethylene terephthalate (PET) and polyethylene naphthalate (PEN), polyolefin resins such as polyethylene and polypropylene, polystyrene, polyamides such as nylon 66, polycarbonate, polyacrylonitrile, polyimide, and other engineering plastics. The resin material is preferably a resin material having mechanical strength and dimensional stability. The resin material is processed into a film and used as the film substrate.

[0023] The resin material may be a non-recycled resin, a recycled resin, or a mixture thereof. When using recycled resin for the outer layer base material 10, which does not come into contact with the contents, material recycled resin may be used, but from the standpoints of hygiene and quality, it is preferable to use chemically recycled resin. The non-recycled resin may be a petroleum-derived resin obtained using a petroleum-derived raw material monomer, a biomass-derived resin obtained using a biomass-derived raw material monomer, or a mixture thereof, but from the viewpoint of reducing the environmental burden, a biomass-derived resin is preferable. The chemically recycled resin may be composed of a single chemically recycled resin, or may be composed of a mixture of multiple types of chemically recycled resins.

[0024] Furthermore, the outer layer base material 10 may have a single layer or a multi-layer structure. In the case of a multi-layer structure, the outer layer base material 10 is formed from a layer configuration of two or more layers, at least one of which contains a chemically recycled resin. In addition, the outer layer substrate 10 may be a layer obtained by co-extrusion multilayer formation of a layer made of ethylene-vinyl alcohol copolymer or a layer made of polyamide using an adhesive resin or the like as necessary, and stretching the formed film. For example, a three-kind five-layer substrate made of chemically recycled resin / adhesive resin / ethylene-vinyl alcohol copolymer / adhesive resin / chemically recycled resin, a three-kind three-layer substrate made of chemically recycled resin / adhesive resin / ethylene-vinyl alcohol copolymer, a multi-layer substrate made of petroleum-derived (natural) resin / chemically recycled resin / petroleum-derived (natural) resin, or petroleum-derived (natural) resin / other polyolefin / chemically recycled resin / other resin / petroleum-derived (natural) resin, etc. may be mentioned. In the multi-layer substrate 10, the same type of material may have different specific gravities depending on the function.

[0025] The outer layer base material 10 may further contain additives such as a filler, an antistatic agent, a plasticizer, a lubricant, a light-shielding pigment, and an antioxidant, as necessary. When the outer layer base material 10 contains a light-shielding pigment, the outer layer base material 10 can function as a light-shielding layer.

[0026] The outer layer base material 10 may be an unstretched film or a stretched film. The stretched film may be a uniaxially stretched film or a biaxially stretched film. The outer layer base material 10 may be composed of either a stretched film or an unstretched film. When the outer layer base material 10 is uniaxially stretched, it is possible to improve the tearability and heat resistance of the laminate 100. When the outer layer base material 10 is a biaxially stretched film, it is possible to improve the mechanical strength and dimensional stability of the laminate 100.

[0027] When an adhesive layer is provided on the surface of the outer layer base material 10, in order to enhance adhesion to the adhesive layer, the surface on the adhesive layer side may be subjected to various pretreatments such as corona treatment, plasma treatment, ozone treatment, and flame treatment, or a coating layer such as an easy-adhesion layer may be provided.

[0028] The thickness of the outer layer substrate 10 is not particularly limited, and is, for example, 10 μm or more and 100 μm or less. From the viewpoint of reducing materials to reduce the environmental load and from the viewpoint of obtaining excellent heat resistance, impact resistance, and gas barrier properties, the thickness of the outer layer substrate 10 may be 15 μm or more, 20 μm or more, 25 μm or more, 30 μm or more, or 40 μm or more. The thickness of the outer layer substrate 10 may also be 60 μm or less, or 50 μm or less.

[0029] (Sealant layer) The sealant layer 30 is made of a polyolefin resin film containing a polyolefin resin such as polyethylene and polypropylene, and the polyolefin resin contains a chemically recycled resin. Polyethylene is a resin containing ethylene as a structural unit. Examples of polyethylene include ethylene homopolymers and copolymers of ethylene and other monomers. The proportion of ethylene in polyethylene is, for example, 80 mol % or more. Examples of other monomers include α-olefins, vinyl acetate, acrylic esters, and the like. The α-olefin may be an olefin having a carbon number in the range of 3 to 20. Examples of the α-olefin include propylene, 1-butene, 1-pentene, 1-hexene, 1-octene, 1-decene, 1-dodecene, 1-tetradecene, 1-hexadecene, 1-octadecene, 1-eicosene, 3-methyl-1-butene, 4-methyl-1-pentene, and 6-methyl-1-heptene. Examples of polyethylene include high density polyethylene (HDPE), medium density polyethylene (MDPE), low density polyethylene (LDPE), linear low density polyethylene (LLDPE), very low density polyethylene (VLDPE), ethylene-vinyl acetate copolymer, ionomer resin, ethylene-acrylic acid copolymer, ethylene-methyl acrylate copolymer, ethylene-methacrylic acid copolymer, ethylene-propylene copolymer, etc. These may be used alone or in combination of two or more.

[0030] Polypropylene is a resin containing propylene as a constituent unit, and may not contain ethylene as a constituent unit, and may be a copolymer of propylene alone or with ethylene or various α-olefins. Examples of polypropylene include homopolypropylene, block polypropylene, and random polypropylene.

[0031] The sealant layer 30 preferably has a melting point lower than that of the outer layer base material 10. In this case, when the laminate 100 is heat-sealed, it is possible to heat-seal the sealant layer 30 while suppressing melting of the outer layer base material 10. Furthermore, by heating the laminate 100, the outer layer base material 10 and the sealant layer 30 can be easily separated, and material recycling can be easily performed for each of the outer layer base material 10 and the sealant layer 30.

[0032] The sealant layer 30 may further contain additives, such as a flame retardant, a slip agent, an antiblocking agent, an antioxidant, a light stabilizer, a tackifier, an antistatic agent, and a light-shielding pigment, as necessary. When the sealant layer 30 contains a light-shielding pigment, the sealant layer 30 can function as a light-shielding layer.

[0033] The sealant layer 30 may be composed of a single layer or multiple layers. When the sealant layer 30 is composed of a single layer, a polyolefin resin film containing a chemically recycled resin (chemically recycled polyolefin resin) as the recycled resin is used for the sealant layer 30. In this case, petroleum-derived polyolefin resin or biomass-derived polyolefin resin may be contained. The sealant layer 30 is the layer that comes into contact with the contents when the contents are placed in a packaging container obtained by using the laminate 100. When the sealant layer 30 is a polyolefin resin film containing chemically recycled polyolefin resin, it contains less foreign matter such as impurities, gels, and aggregates, and therefore can further reduce the possibility that foreign matter such as impurities, gels, and aggregates will migrate to the contents as a result of heating during retort treatment or boiling treatment of the packaging container. Therefore, the laminate 100 can be used safely to package contents such as food. When the sealant layer 30 is composed of multiple layers, all of the layers may be polyolefin resin films containing chemically recycled polyolefin resin, or the sealant layer 30 may have a multi-layer structure of a non-recycled polyolefin resin film and a polyolefin resin film containing chemically recycled polyolefin resin. When the plurality of layers is three layers, the plurality of layers may consist of a first outer layer, a middle layer, and a second outer layer. For example, the first outer layer and the second outer layer may be made of a non-recycled polyolefin resin film, and the intermediate layer may be made of a recycled polyolefin resin film. The sealant layer 30 may be colored white or the like. For example, a white sealant containing a titanium oxide-based white pigment may be used. The sealant layer 30 is not limited to a white sealant, and may be composed of a sealant of another color by containing a pigment other than the white pigment.

[0034] The thickness of the sealant layer 30 is not particularly limited and is appropriately adjusted depending on the application of the laminate 100. The thickness of the sealant layer 30 may be, for example, 10 μm or more, 25 μm or more, 30 μm or more, 40 μm or more, or 50 μm or more. The thickness of the sealant layer 30 may be 100 μm or less, 80 μm or less, 60 μm or less, or 50 μm or less.

[0035] (Second sealant layer) As the second sealant layer 40, the same material as the sealant layer 30 can be used. The thickness of the second sealant layer 40 may be the same as or different from the thickness of the sealant layer 30. The material constituting the second sealant layer 40 may also be the same as or different from the material constituting the sealant layer 30.

[0036] (Intermediate substrate) The intermediate base material 20 is a base material that reinforces the outer layer base material 10, and can further improve the strength of the laminate 100. The intermediate substrate 20 may be a film substrate made of the same resin material as that used for the outer layer substrate 10. That is, examples of the resin material include polyester films such as polyethylene terephthalate (PET) and polyethylene naphthalate (PEN), polyolefin resins such as polyethylene and polypropylene, polystyrene, polyamides such as nylon 66, polycarbonate, polyacrylonitrile, polyimide, and other engineering plastics. The resin material is preferably a resin material having mechanical strength and dimensional stability. The resin material is processed into a film and used as the film substrate. The film substrate may be an unstretched film or a stretched film.

[0037] The intermediate substrate 20 may be a single layer or a laminate of multiple layers. When the intermediate substrate 20 is composed of a single layer, the intermediate substrate 20 may be a recycled polyolefin resin film or a non-recycled polyolefin resin film. When the intermediate substrate 20 is composed of multiple layers, all of the layers may be recycled polyolefin resin films, or may be non-recycled polyolefin resin films, or some of the layers may be non-recycled polyolefin resin films and the remaining layers may be recycled polyolefin resin films. In addition, as long as the content of recycled resin in the laminate 100 is 10% by volume or more or 10% by mass or more, materials other than those mentioned above can be used as the material constituting the intermediate substrate 20. For example, polyethylene terephthalate resin can be used as the material constituting the intermediate substrate 20, although the polyolefin resin ratio in the packaging material is reduced. In addition, if polyethylene terephthalate resin produced by chemical recycling is used as the material constituting the intermediate substrate 20, the content of recycled resin can be improved. In addition, nylon resin film or the like can also be used as the intermediate substrate 20. Furthermore, nylon resin film produced by chemical recycling may be used as the nylon resin film. When the plurality of layers is three layers, the plurality of layers may consist of a first outer layer, a middle layer, and a second outer layer. Here, the first and second outer layers may be made of non-recycled polyolefin resin films, and the intermediate layer may be made of recycled polyolefin resin films. In this case, the possibility that foreign matter such as impurities, gels, and aggregates will migrate from the intermediate substrate 20 through the sealant layer 30 to the contents due to heating during retort or boiling treatment of the packaging container can be further reduced. For this reason, the laminate 100 can be used safely to package contents such as food.

[0038] The thickness of the intermediate substrate 20 is not particularly limited and is appropriately adjusted depending on the application of the laminate 100. The thickness of the intermediate substrate 20 may be, for example, 10 μm or more, 25 μm or more, 30 μm or more, 40 μm or more, or 50 μm or more. The thickness of the intermediate substrate 20 may be 100 μm or less, 80 μm or less, 60 μm or less, or 50 μm or less.

[0039] (Adhesive layer) Examples of the adhesive layer include an adhesive layer formed using an adhesive agent and an adhesive layer containing an adhesive resin (hereinafter, also referred to as an "adhesive resin layer").

[0040] Examples of the adhesive include known adhesives such as urethane adhesives, polyester adhesives, polyamide adhesives, epoxy adhesives, and isocyanate adhesives.

[0041] The adhesive may or may not contain a biomass-derived component, but from the viewpoint of reducing the environmental load, it is preferable that the adhesive contains a biomass-derived component. Specific examples of the biomass-derived component include the "DIC Dry BM Series" manufactured by DIC Corporation and the "ECOAD Series" manufactured by Toyo Ink Co., Ltd.

[0042] The adhesive may be an adhesive containing an organic solvent or an adhesive containing no organic solvent, but from the viewpoint of reducing the environmental load, an adhesive containing no organic solvent (solvent-free adhesive) is preferable.

[0043] The adhesive resin layer may be an extruded or non-extruded resin layer. The adhesive resin is a heat-sealable adhesive thermoplastic resin, and may be any resin that can melt and fuse to each other by heat. For example, acid-modified polyolefin resins obtained by modifying polyolefin resins such as low-density polyethylene, medium-density polyethylene, high-density polyethylene, linear low-density polyethylene, polypropylene, ethylene-propylene copolymer, methylpentene polymer, polyethylene or polypropylene with unsaturated carboxylic acids such as acrylic acid, methacrylic acid, maleic acid, maleic anhydride, fumaric acid, itaconic acid, and the like, and other resins can be used. The thickness of the adhesive layer is not particularly limited and may be, for example, 1 μm or more. By making the thickness of the adhesive layer 1 μm or more, sufficient adhesive strength can be obtained. The thickness of the adhesive layer may be 2 μm or more. The thickness of the adhesive layer may be 50 μm or less, 5 μm or less, or 3 μm or less.

[0044] (Printing layer) The printed layer 50 may be provided between layers or on the outside of the laminate 100 as shown in FIG. 2 or FIG. 3. When the printed layer 50 is provided between layers, the printed layer 50 is provided on the surface (outer surface) opposite to the sealant layer 30 side as shown in FIG. 2 or FIG. 3, for example. The printed layer 50 may be provided on the surface (inner surface) of the sealant layer 30 side of the outer layer substrate 10. When the printed layer 50 is provided on the inner surface of the outer layer substrate 10, the printed layer 50 is protected by the outer layer substrate 10, so that the printed layer 50 can be prevented from deteriorating. When the printed layer 50 is provided on the outer surface of the outer layer substrate 10 and the printed layer 50 is the outermost layer of the laminate 100, the printed layer 50 can be easily removed when recycling after disposal of the packaging body including the laminate 100. In addition, when the laminate 100 includes an intermediate substrate 20 as shown in FIG. 2 or FIG. 3, the printed layer 50 may be provided on the intermediate substrate 20. Here, the printed layer 50 may be provided between the outer layer substrate 10 and the intermediate substrate 20 as shown in FIG. 2 or FIG. 3, or may be provided between the intermediate substrate 20 and the sealant layer 30.

[0045] Furthermore, when the laminate 100 includes the second sealant layer 40, the printed layer 50 may be provided on the second sealant layer 40. When the printed layer 50 is provided on the second sealant layer 40, providing the printed layer 50 on the surface (outer surface) of the second sealant layer 40 opposite the outer layer base material 10 makes it possible to easily remove the printed layer 50 when recycling the package including the laminate 100 after disposal. The print layer 50 is a layer that displays characters, pictures, etc., and can be formed using ink.

[0046] As the ink, for example, inks obtained by adding various pigments, plasticizers, drying agents, stabilizers, etc. to a binder resin such as a urethane-based, acrylic-based, nitrocellulose-based, or rubber-based ink can be used.

[0047] The ink may be either water-based or oil-based, but is preferably water-based. Water-based inks use water or alcohol as a solvent, and therefore can further reduce the environmental impact. In particular, when the adhesive is a solventless adhesive, the use of water-based ink as the ink can significantly reduce the environmental impact. In addition, the ink may be biomass ink or not, but from the viewpoint of reducing the environmental impact, it is preferable that the ink is biomass ink. Here, biomass ink refers to ink containing components obtained from biological resources (biomass) such as cotton, pulp, rice bran, vegetable oil, and angiosperm seeds. The ink may be recycled ink made by collecting and recycling used ink, or may be non-recycled ink. From the viewpoint of environmental impact, however, recycled ink is preferable. Furthermore, easily recyclable inks can be used as the ink. By using easily recyclable inks, it becomes possible to easily recycle the packaging after it has been discarded. Specifically, an example of an easily recyclable ink is "SunSpectro Solvawash" manufactured by DIC Corporation.

[0048] (Gas barrier layer) The laminate 100 may include a gas barrier layer 60 together with the printed layer 50 as shown in Fig. 2 or 3, or may include the gas barrier layer 60 instead of the printed layer 50. The gas barrier layer 60 may be provided on at least one surface of the outer layer substrate 10. Furthermore, when the laminate 100 includes an intermediate substrate 20, the gas barrier layer 60 may be provided on at least one surface of the intermediate substrate 20 as shown in Fig. 2 or 3. The gas barrier layer 60 is a layer that improves the gas barrier properties of the laminate 100 . The gas barrier layer 60 has a barrier property against gases such as water vapor or oxygen.

[0049] As the gas barrier layer 60, for example, a vapor deposition layer such as a vapor deposition layer of a metal or a vapor deposition layer of an inorganic compound can be used. Metals include aluminum and silicon. Inorganic oxides include aluminum oxide and silicon oxide (silica). When the gas barrier layer 60 is a vapor-deposited layer of a metal such as aluminum, the gas barrier layer 60 can function as a light-shielding layer. The gas barrier layer 60 may further include an overcoat layer on the deposition layer. As the overcoat layer, a coating layer obtained using a composition containing a water-soluble polymer and silicon alkoxide, or a coating layer made of a resin such as urethane can be used.

[0050] (Other layers) The laminate 100 may further include a layer containing a resin other than polyolefin resin (non-polyolefin resin) so long as the recycled resin content is 10% by volume or more or 10% by mass or more. Examples of non-polyolefin resins include polyamide resins such as nylon, and polyester resins such as polyethylene terephthalate (PET).

[0051] (Laminate) (A) Recycled resin content In the laminate 100, the content of recycled resin in the laminate 100 is 10% by volume or more or 10% by mass or more. When the recycled resin content in the polyolefin resin film containing recycled resin is 100 volume % (100 mass %), the recycled resin content in the laminate 100 can be determined as the ratio of the total thickness of the film to the total thickness of the laminate 100. However, when the recycled resin content in the polyolefin resin film containing recycled resin is X mass % (less than 100 mass %) and the thickness of the film is Y1 (μm), the recycled resin content of the film thickness Y2 (μm) is calculated as X / 100×Y1 (μm). The content of recycled resin in the laminate 100 is preferably 20% by volume or more or 20% by mass or more, more preferably 25% by volume or more or 25% by mass or more, even more preferably 30% by volume or more or 30% by mass or more, and particularly preferably 40% by volume or more or 40% by mass or more.

[0052] In the present disclosure, the above-mentioned recycled resin is a chemical recycled resin and does not include material recycled resin. The chemically recycled resin may be a post-consumer recycled resin (PCR), a post-industrial recycled resin (PIR), or a mixture thereof, but is preferably a PCR. Since PCR can be secured in large quantities on the market, if the chemically recycled resin is a PCR, the cost of the laminate 100 can be reduced.

[0053] (B) Odor components In a total ion chromatogram obtained by subjecting laminate 100 to mass analysis using purge-and-trap gas chromatography-mass spectrometry, when the ratio of the peak area of ​​nonanal as an indicator of odor components to the sum of the peak area values ​​of all aliphatic hydrocarbon components is R1 (%) and the ratio of the peak area of ​​decanal to the sum of the peak area values ​​of all aliphatic hydrocarbon components is R2 (%), R1 is preferably less than 1.5%, more preferably 1.0% or less, and particularly preferably 0.5% or less. Furthermore, R2 is preferably less than 3.5%, more preferably 2.5% or less, and particularly preferably 1.5% or less. It is preferable that R1 is less than 1.5% and R2 is less than 3.5%, in which case thermal degradation is suppressed overall in the laminate 100, and the quality of the laminate 100 can be further improved. Specifically, the above mass spectrometry is carried out by cutting out a 1.0 gram sample from the laminate 100, placing this sample in a 20 mL vial together with a collector of odor components, heating it at 60°C for 1 hour to adsorb the volatile components from the sample onto the collector, and then analyzing the volatile components in the collector using a purge-and-trap gas chromatograph mass spectrometer.

[0054] (C) Fisheye Fisheyes refer to foreign matter such as gelled or charred spots that look like fish eyes and are found on film. If a fisheye has a diameter of 1 mm or more, it is considered a defective product. The number of fisheyes with a diameter of 0.5 mm or more but less than 1 mm is 100 per m 2 Less than or equal to 50 pieces / m 2 Less than 10 pieces / m 2 It would be better if it was less than this.

[0055] (D) Variation in kinetic friction On the surface of the sealant layer 30 of the laminate 100, the variation (in-plane variation) σ of the kinetic friction force refers to the standard deviation of the kinetic friction force. σ is preferably less than 0.45, more preferably less than 0.35, and particularly preferably less than 0.2. When σ is less than 0.45, the transportability of the laminate 100 can be improved when the layer having σ of less than 0.45 is placed on the transport roller side. In addition, on the surface of the layer, there are regions where the dynamic friction force received from the transport roller is large and regions where it is small, and the difference in stress between the regions is small, so that the residual distortion in the layer is reduced, and the decrease in the strength of the laminate 100 caused by the residual distortion can be suppressed. From the viewpoint of the strength of the laminate, σ is preferably 0.1 or more, more preferably 0.2 or more, and particularly preferably 0.3 or more. The dynamic friction coefficient is measured for the laminate 100 using a multi-function static and dynamic friction tester TL201Tt (manufactured by Trinity Lab Co., Ltd.) and a tactile probe. The standard deviation σ of the dynamic friction force is a value obtained based on JIS K 7125-ISO8295, and specifically, is determined by placing the laminate 100 on a test table with the sealant layer 30 facing down, and moving a tactile probe at a sliding speed of 10 mm / sec while contacting the laminate 100 with a load of 50 grams.

[0056] (E) Impurities The laminate 100 is analyzed by a Fourier transform infrared spectrophotometer (FT-IR: Fourier transform infrared spectroscopy) using an attenuated total reflection (ATR) measurement method. When an ATR spectrum is obtained, the 2915 cm -1 Absorption coefficients of CH inverse symmetric stretching of methylene groups near 1720 cm from polyesters and polyurethanes -1 The ratio R3 of the absorption coefficients for C=O stretching near the polyolefin is preferably less than 0.1, more preferably less than 0.05, and particularly preferably 0.01 or less, as an index showing that there are few resin components other than polyolefin. In the above analysis, a diamond prism is used as the prism to be brought into close contact with the laminate 100, and the angle of incidence with respect to the surface of the laminate 100 is set to 45°.

[0057] Furthermore, when the laminate 100 includes the outer layer base material 10 and the sealant layer 30, both the outer layer base material 10 and the sealant layer 30 may be recycled polyolefin resin films.

[0058] <Packaged goods> Next, an embodiment of a packaging article according to another aspect of the present disclosure will be described with reference to Fig. 4. Fig. 4 is a cross-sectional view showing one embodiment of a packaging article according to another aspect of the present disclosure. As shown in FIG. 4, the packaged article 500 includes a packaging bag 400 as a packaging container, and a content C accommodated in the packaging bag 400. The packaging bag 400 is obtained by using a pair of laminates 100. The packaging bag 400 is obtained, for example, by placing the sealant layers 30 of the pair of laminates 100 facing each other and bonding the peripheral portions. The packaging bag 400 is composed of a storage section that accommodates the content C, and an adhesive section provided around the storage section. The adhesive section is a portion formed by bonding the sealant layers 30 of the opposing laminates 100 to each other, and the storage section is a portion where the sealant layers 30 of the opposing laminates 100 are not bonded to each other.

[0059] According to the packaging item 500, the chemically recycled resin as the recycled resin contained in the laminate 100 is less likely to be contaminated with foreign matter such as impurities, gels, and aggregates, compared to materially recycled resin, which is a resin obtained by cleaning and crushing resin products such as collected used packaging materials, and then heating and melting them to re-materialize them. In addition, unlike materially recycled resin, the chemically recycled resin is not affected by heat treatment such as heating and melting after the recycling process, and is therefore less likely to be thermally deteriorated. Therefore, the packaging item 500 can safely contain the contents C such as food even if the content of the recycled resin in the laminate 100 is sufficiently high to 10% by volume or more or 10% by mass or more. In addition, since the laminate 100 can improve the quality, the packaging item 500 equipped with the packaging bag 400 obtained using the packaging laminate 100 can improve properties such as strength.

[0060] (Contents) The contents C are not particularly limited and may be appropriately selected depending on the application of the packaging bag 400. The contents C are not particularly limited, and examples of the contents C include food, shampoo, rinse, body soap, detergent, and the like.

[0061] (packaging bag) The pair of laminates 100 constituting the packaging bag 400 may have the same configuration as each other, or may have different configurations from each other.

[0062] The packaging bag 400 may have a half-cut line, and may further have an easy-open processed part at both ends or one end of the half-cut line. Examples of the easy-open processed part include a group of scars, and a V-shaped, U-shaped, or I-shaped notch.

[0063] In the adhesive portion of the packaging bag 400, the sealant layers 30 of the pair of laminates 100 may be directly bonded to each other by heat sealing (see FIG. 4), or may be bonded to each other by an adhesive.

[0064] (Method of manufacturing packaging articles) Next, an example of a method for producing a packaged article 500 using the laminate 100 will be described.

[0065] First, a pair of laminates 100 is prepared. Then, the sealant layers 30 of the pair of laminates 100 are placed opposite each other, and the sealant layers 30 are bonded together. At this time, a part of the peripheral portion of the laminate is bonded to form a U-shape to form a bonded portion, and a non-bonded portion (unbonded portion) is also formed. In this manner, a packaging bag having an opening formed by the unbonded portion is obtained.

[0066] Next, the contents C are filled in through the opening of the packaging bag. Thereafter, the sealant layers 30 of the laminate 100 are bonded together at the unbonded portions, so that the unbonded portions also become bonded portions. In this manner, a packaged article 500 including the packaging bag 400 and the contents C contained therein can be manufactured.

[0067] Although the preferred embodiments of the present disclosure have been described above, the present disclosure is not limited to the above embodiments. For example, in the packaged article 500 shown in Fig. 4, the packaging bag 400 is formed using a pair of laminates 100, but the laminates 200 may be used instead of the laminates 100. The packaging bag may also be manufactured by folding one laminate 100, 200 with the sealant layer 30 on the inside and bonding the overlapping peripheral portions together.

[0068] 4, the packaging bag 400 may be a standing pouch-shaped packaging bag, a two-sided bag, a three-sided bag, a four-sided bag, a palm-shaped bag, or a gusset bag. The packaging bag 400 may be provided with a stopper or a synthetic resin fastener that can be repeatedly sealed by fitting a strip-shaped protrusion and a strip-shaped groove.

[0069] In the above embodiment, the packaging container is configured as a packaging bag, but the packaging container may be a tube container. When the packaging container is a tube container, the laminate 100 includes a second sealant layer 40 that is adhered to the outer layer base material 10.

[0070] The embodiments of the present disclosure have been described above, and the outline of the present disclosure is as follows. [1] A laminate for packaging materials comprising an outer layer base material and a sealant layer, the sealant layer being a polyolefin resin film containing a recycled resin, the content of the recycled resin in the laminate for packaging materials being 10% by volume or more or 10% by mass or more, and the recycled resin being a chemically recycled resin. [2] The laminate for packaging materials according to [1], wherein the content of the recycled resin in the laminate for packaging materials is 20% by volume or more or 20% by mass or more. [3] The laminate for packaging materials according to [1] or [2], wherein the thickness of the sealant layer is greater than the thickness of the outer layer base material, and the content of the recycled resin contained in the sealant layer is 20% by volume or more or 20% by mass or more. [4] The laminate for packaging materials according to any one of [1] to [3], further comprising an intermediate substrate between the outer layer substrate and the sealant layer. [5] The packaging laminate according to any one of [1] to [4], further comprising a gas barrier layer between the outer layer base material and the sealant layer. [6] The laminate for packaging materials according to any one of [1] to [5], further comprising a second sealant layer on a surface of the outer layer base material opposite to the sealant layer side. [7] An adhesive layer is further provided between the outer layer base material and the sealant layer, The adhesive layer is an adhesive layer formed using an adhesive, The laminate for packaging materials according to any one of [1] to [6], wherein the adhesive is a urethane-based adhesive, a polyester-based adhesive, a polyamide-based adhesive, an epoxy-based adhesive, or an isocyanate-based adhesive. [8] A packaging container obtained by using the laminate for packaging material according to any one of [1] to [7]. [9] A packaging article comprising the packaging container described in [8] and contents contained in the packaging container. EXAMPLES

[0071] The present disclosure will be described more specifically with reference to the following examples, but the present disclosure is not limited to these examples.

[0072] Example 1 A petroleum-derived biaxially oriented PET film (thickness 35 μm) was prepared as the outer layer substrate, and a chemically recycled low-density polyethylene (PCR ChemiR 100%-LDPE) film (thickness 50 μm) was prepared as the sealant layer. Note that "PCR ChemiR 100%-LDPE" means that the content of post-consumer chemical recycled resin (PCR ChemiR) in the sealant layer is 100% by volume (100% by mass). Then, a printed layer was formed on one surface of the outer layer substrate using aqueous flexographic ink, and then a dry lamination adhesive (urethane-based adhesive) was applied to the surface of the printed layer to form an adhesive layer with a thickness of 3 μm (dry film thickness). A sealant layer was then bonded to the adhesive layer to produce a packaging laminate (outer layer substrate / printed layer / adhesive layer / sealant layer).

[0073] Example 2 A petroleum-derived biaxially oriented PET film (35 μm thick) was prepared as the outer layer substrate, a biaxially oriented PET film (35 μm thick) was prepared as the intermediate substrate, and a chemically recycled low-density polyethylene (PCR ChemiR 100%-LDPE) film (50 μm thick) was prepared as the sealant layer. Note that "PCR ChemiR 100%-LDPE" means that the content of post-consumer chemical recycled resin (PCR ChemiR) in the sealant layer is 100% by volume (100% by mass). A 10-nm-thick aluminum oxide layer was then deposited on one side of the substrate, and a 300-nm-thick organic-inorganic hybrid layer was formed as an overcoat layer on the deposited layer. The organic-inorganic hybrid layer was formed using a composition containing polyvinyl alcohol resin and tetraethoxysilane. Next, a printing layer was formed on one surface of the outer layer substrate using aqueous flexographic ink, and then a dry lamination adhesive (urethane adhesive) was applied to the surface of the printing layer to form a first adhesive layer with a thickness of 3 μm (dry film thickness), and the overcoat layer of the intermediate substrate was bonded to the first adhesive layer. Next, a dry lamination adhesive (urethane adhesive) was applied to the surface of the intermediate substrate opposite the overcoat layer to form a second adhesive layer with a thickness of 3 μm (dry film thickness), and a sealant layer was bonded to the second adhesive layer to produce a packaging laminate (outer layer substrate / printing layer / first adhesive layer / overcoat layer / vapor deposition layer / intermediate substrate / second adhesive layer / sealant layer).

[0074] Example 3 The outer layer substrate was changed from a petroleum-derived biaxially oriented PET film (thickness 35 μm) to a biomass-derived biaxially oriented PET film (thickness 35 μm), the sealant layer was changed from a chemically recycled low-density polyethylene (PCR ChemiR 100%-LDPE) film (thickness 50 μm) to a chemically recycled low-density polyethylene (PCR ChemiR 40%-LDPE) film (thickness 50 μm), and the adhesive was changed from a dry lamination adhesive (urethane-based adhesive) to a solvent-free adhesive (polyester-based) to form an adhesive layer with a thickness of 1.5 μm (after drying). Except for this, a packaging laminate (outer layer substrate / printed layer / adhesive layer / sealant layer) was produced in the same manner as in Example 1. It should be noted that "PCR ChemiR 40%-LDPE" means that the content of post-consumer chemical recycled resin (PCR ChemiR) in the sealant layer is 40% by mass.

[0075] Example 4 The intermediate substrate was changed from a petroleum-derived biaxially oriented PET film (thickness 35 μm) to a petroleum-derived polyamide film (nylon 6: thickness 35 μm), and the sealant layer was changed from a chemically recycled low-density polyethylene (PCR Chemi R 100%-LDPE) film (thickness 50 μm) to a petroleum-derived low-density polyethylene (LDPE) film (thickness 20 μm), a chemically recycled low-density polyethylene (PCR Chemi R 100%-LDPE) film (thickness 20 μm), and a petroleum-derived low-density polyethylene (LDPE) film (thickness 20 μm). Except for this, a laminate for packaging materials (outer layer substrate / printing layer / first adhesive layer / overcoat layer / vapor deposition layer / intermediate substrate / second adhesive layer / sealant layer) was produced in the same manner as in Example 2.

[0076] Example 5 The outer layer substrate was changed from a petroleum-derived biaxially oriented PET film (thickness 35 μm) to a petroleum-derived polyamide film (nylon 6: thickness 35 μm), and the sealant layer was changed from a chemically recycled low-density polyethylene (PCR Chemi R 100%-LDPE) film (thickness 50 μm) to a petroleum-derived low-density polyethylene (LDPE) film (thickness 20 μm), a chemically recycled low-density polyethylene (PCR Chemi R 100%-LDPE) film (thickness 20 μm), and a petroleum-derived low-density polyethylene (LDPE) film (thickness 20 μm). Except for this, a packaging laminate (outer layer substrate / printing layer / first adhesive layer / overcoat layer / vapor deposition layer / intermediate substrate / second adhesive layer / sealant layer) was produced in the same manner as in Example 2.

[0077] Example 6 The outer layer base material is made from petroleum-derived biaxially oriented PET film (thickness 35 μm), The intermediate substrate was changed from a petroleum-derived biaxially oriented PET film (thickness 35 μm) to a petroleum-derived oriented polypropylene film (OPP: thickness 35 μm), the intermediate substrate was changed from a petroleum-derived biaxially oriented PET film (thickness 35 μm) to a petroleum-derived oriented polypropylene film (OPP: thickness 35 μm), and the sealant layer was changed from a chemically recycled low-density polyethylene (PCR ChemiR 100%-LDPE) film (thickness 50 μm) to an unstretched polypropylene (PCR ChemiR 40%-CPP) film (thickness 50 μm) containing 40% by mass of chemically recycled polypropylene. Except for this, a laminate for packaging material (outer layer substrate / printed layer / first adhesive layer / overcoat layer / vapor deposition layer / intermediate substrate / second adhesive layer / sealant layer) was produced in the same manner as in Example 2. The deposition layer on the OPP film intermediate substrate was formed by depositing silicon oxide to a thickness of 10 nm, and the overcoat layer was an organic-inorganic hybrid layer formed using a composition containing polyvinyl alcohol resin, tetraethoxysilane, and a silane coupling agent.

[0078] Example 7 A packaging laminate (outer layer substrate / printed layer / first adhesive layer / overcoat / vapor deposition layer / intermediate substrate / second adhesive layer / sealant layer) was produced in the same manner as in Example 2, except that the outer layer substrate was changed from a petroleum-derived biaxially oriented PET film (thickness 35 μm) to a petroleum-derived oriented polypropylene film (OPP: thickness 25 μm) and the intermediate substrate was changed from a petroleum-derived biaxially oriented PET film (thickness 35 μm) to a petroleum-derived oriented polypropylene film (OPP: thickness 25 μm). The deposition layer on the OPP film intermediate substrate was formed by depositing silicon oxide to a thickness of 10 nm, and the overcoat layer was an organic-inorganic hybrid layer formed using a composition containing polyvinyl alcohol resin, tetraethoxysilane, and a silane coupling agent.

[0079] Example 8 The outer layer substrate was changed from a petroleum-derived oriented polypropylene film (OPP: thickness 25 μm) to a biomass-derived oriented polypropylene film (OPP: thickness 25 μm), and the sealant layer was changed from a chemically recycled low-density polyethylene (PCR Chemi R 100%-LDPE) film (thickness 50 μm) to a petroleum-derived low-density polyethylene (LDPE) film (thickness 20 μm), a chemically recycled low-density polyethylene (PCR Chemi R 100%-LDPE) film (thickness 20 μm), and a petroleum-derived low-density polyethylene (LDPE) film (thickness 20 μm). Except for this, a laminate for packaging material (outer layer substrate / printing layer / first adhesive layer / overcoat layer / vapor deposition layer / intermediate substrate / second adhesive layer / sealant layer) was produced in the same manner as in Example 7.

[0080] Example 9 As the outer layer substrate, a petroleum-derived biaxially stretched PET film (30 μm thick) was prepared, as the sealant layer, a three-layer co-extrusion film of petroleum-derived low-density polyethylene (LDPE) film (20 μm thick), chemically recycled low-density polyethylene (PCR ChemiR 100%-LDPE) film (40 μm thick), and petroleum-derived low-density polyethylene (LDPE) film (20 μm thick) was prepared, and as the second sealant layer (outer sealant layer), a petroleum-derived low-density polyethylene (LDPE) film (80 μm thick) was prepared. Note that "PCR ChemiR 100%-LDPE" means that the content of post-consumer chemically recycled resin (PCR ChemiR) in the PCR ChemiR 100%-LDPE film of the sealant layer is 100% by volume (100% by mass). Then, a printed layer was formed on one side of the second sealant layer (outer sealant layer) using aqueous flexographic ink, and then a dry lamination adhesive (urethane adhesive) was applied to one side of the outer layer substrate to form a first adhesive layer having a thickness of 3 μm (dry film thickness), and the outer layer substrate and the surface of the second sealant layer (outer sealant layer) opposite to the printed layer were bonded together using the first adhesive layer. Next, a dry lamination adhesive (urethane adhesive) was applied to the other side of the outer layer substrate to form a second adhesive layer having a thickness of 3 μm (dry film thickness), and the sealant layer was bonded to the second adhesive layer to produce a packaging laminate (printed layer / second sealant layer (outer sealant layer) / first adhesive layer / outer layer substrate / second adhesive layer / sealant layer).

[0081] Example 10 The outer layer substrate was changed from a petroleum-derived biaxially oriented PET film (thickness 30 μm) to a petroleum-derived oriented polypropylene film (OPP: thickness 30 μm), and the second sealant layer (outer sealant layer) was changed from a petroleum-derived low-density polyethylene (LDPE) film (thickness 80 μm) to a petroleum-derived low-density polyethylene (LDPE) film (thickness 20 μm), chemically recycled low-density polyethylene (PCR Chemi R 100%-LDPE) film (thickness 40 μm), and a petroleum-derived low-density polyethylene (LDPE) film (thickness 20 μm). Except for this, a laminate for packaging material (printing layer / second sealant layer (outer sealant layer) / first adhesive layer / outer layer substrate / second adhesive layer / sealant layer) was produced in the same manner as in Example 9. The deposition layer on the OPP film of the outer layer substrate was formed by depositing silicon oxide to a thickness of 10 nm, and the overcoat layer was an organic-inorganic hybrid layer formed using a composition containing polyvinyl alcohol resin, tetraethoxysilane, and a silane coupling agent.

[0082] Comparative Example 1 A petroleum-derived biaxially oriented PET film (thickness 35 μm) was prepared as the outer layer substrate, and a low-density polyethylene (PCRMR100%-LDPE) film (thickness 60 μm) made from recycled low-density polyethylene (LDPE) resin made from used polyethylene bags was prepared as the sealant layer. Note that "PCRMR100%-LDPE" means that the content of post-consumer mechanically recycled resin (PCRMR) in the outer layer substrate is 100% by volume (100% by mass). Then, a printing layer was formed on one surface of the outer layer substrate using water-based flexographic ink, a dry laminating adhesive (urethane-based adhesive) was applied to the surface of the printing layer to form an adhesive layer with a thickness of 3 μm (dry film thickness), and a sealant layer was bonded to the adhesive layer to produce a packaging laminate (outer layer substrate / printed layer / adhesive layer / sealant layer).

[0083] Comparative Example 2 A packaging laminate (outer layer substrate / printed layer / adhesive layer / sealant layer) was produced in the same manner as in Comparative Example 1, except that the outer layer substrate was changed from a petroleum-derived biaxially oriented PET film (thickness 35 μm) to a petroleum-derived biaxially oriented PET film (thickness 50 μm), and the sealant layer was changed from a PCRMR100%-LDPE film (thickness 60 μm) to a low-density polyethylene (PCRMR40%-LDPE) film (thickness 60 μm) obtained by washing used polyethylene bags and mixing low-density polyethylene (PCRMR-LDPE) pellets obtained by mechanical recycling with petroleum-derived LDPE pellets in a ratio of 40:60 (mass ratio). "PCRMR40%-LDPE" means that the content of post-consumer mechanically recycled resin (PCRMR) in the sealant layer is 40% by mass. In this case, the volume of the layer made of recycled material can be calculated by taking into account the density of the mixed resin, and the film thickness ratio can be calculated using this. Note that the density of the mixed resins is the same, and mass% is volume%. In addition, the density of the PCRMR40%-LDPE film used in the sealant layer is low (0.920 g / cm 3 ) was decided.

[0084] Comparative Example 3 A petroleum-derived biaxially oriented PET film (thickness 35 μm) was prepared as the outer layer substrate, a petroleum-derived biaxially oriented PET film (thickness 35 μm) was prepared as the intermediate substrate, and a three-layer co-extruded film of petroleum-derived low-density polyethylene (LDPE) film (thickness 20 μm), low-density polyethylene (PCRMR100%-LDPE) film (thickness 20 μm) recycled from used polyethylene bags, and a petroleum-derived low-density polyethylene (LDPE) film (thickness 20 μm) was prepared as the sealant layer. Then, a printed layer was formed on one surface of the outer layer substrate using an aqueous flexographic ink, a laminating adhesive (urethane adhesive) was applied to the surface of the printed layer to form a first adhesive layer having a thickness of 3 μm (dry film thickness), and an intermediate substrate was bonded to the first adhesive layer. Next, a dry laminating adhesive (urethane adhesive) was applied to the surface of the intermediate substrate opposite to the first adhesive layer to form a second adhesive layer having a thickness of 3 μm (dry film thickness), and a sealant layer was bonded to the second adhesive layer to produce a packaging laminate (outer layer substrate / printed layer / first adhesive layer / intermediate substrate / second adhesive layer / sealant layer).

[0085] Comparative Example 4 The outer layer substrate was changed from a petroleum-derived biaxially oriented PET film (thickness 35 μm) to a petroleum-derived biaxially oriented polypropylene film (OPP: thickness 35 μm), the intermediate layer was changed from a petroleum-derived biaxially oriented PET film (thickness 35 μm) to a petroleum-derived biaxially oriented polypropylene film (OPP: thickness 35 μm), and the sealant layer was changed from a petroleum-derived low-density polyethylene (LDPE) film (thickness 20 μm) and a used polyethylene bag to a low-density polyethylene (PCRMR100%-LDPE) film (thickness 20 μm) and a petroleum-derived low-density polyethylene (LDPE) film (thickness 20 μm) three-layer co-extrusion film made of a petroleum-derived low-density polyethylene (LDPE) film (thickness 20 μm) to a low-density polyethylene (PCRMR100%-LDPE) film (thickness 50 μm) made of a used polyethylene bag. A laminate for packaging material (outer layer substrate / printing layer / first adhesive layer / intermediate substrate / second adhesive layer / sealant layer) was produced in the same manner as in Comparative Example 3.

[0086] Comparative Example 5 As the outer layer substrate, a petroleum-derived biaxially oriented PET film (thickness 50 μm) was prepared, as the sealant layer, a low-density polyethylene (PCRMR40%-LDPE) film (thickness 80 μm) was prepared by washing used polyethylene bags and mixing low-density polyethylene (PCRMR-LDPE) pellets obtained by mechanical recycling with petroleum-derived LDPE pellets in a ratio of 40:60 (mass ratio), and as the second sealant layer (outer sealant layer), a low-density polyethylene (PCRMR40%-LDPE) film (thickness 80 μm) was prepared by washing used polyethylene bags and mixing low-density polyethylene (PCRMR-LDPE) pellets obtained by mechanical recycling with petroleum-derived LDPE pellets in a ratio of 40:60 (mass ratio). Note that "PCRMR40%-LDPE" means that the content of post-consumer mechanically recycled resin (PCRMR) in the sealant layer or the second sealant layer is 40% by mass. In this case, the volume of the sealant layer or the second sealant layer can be calculated taking into account the density of the mixed resin, and the film thickness ratio can be calculated using this. Note that the densities of the mixed resins are the same, and mass% is volume%. In addition, the density of the PCRMR-LDPE40% film used for the outer layer substrate is low (0.920 g / cm 3 ) was decided. Then, a printed layer was formed on one side of the second sealant layer (outer sealant layer) using aqueous flexographic ink, and then a dry lamination adhesive (urethane adhesive) was applied to one side of the outer layer substrate to form a first adhesive layer having a thickness of 3 μm (dry film thickness), and the outer layer substrate and the surface of the second sealant layer (outer sealant layer) opposite to the printed layer were bonded together using the first adhesive layer. Next, a dry lamination adhesive (urethane adhesive) was applied to the other side of the outer layer substrate to form a second adhesive layer having a thickness of 3 μm (dry film thickness), and the sealant layer was bonded to the second adhesive layer to produce a packaging laminate (printed layer / second sealant layer (outer sealant layer) / first adhesive layer / outer layer substrate / second adhesive layer / sealant layer).

[0087] (Reference example 1) A petroleum-derived biaxially oriented PET film (thickness: 25 μm) was prepared as the outer layer substrate, and a petroleum-derived LDPE film (thickness: 60 μm) was prepared as the sealant layer. Then, a printing layer was formed on one surface of the outer layer substrate using aqueous flexographic ink, and a laminating adhesive (urethane-based adhesive) was applied to the surface of the printed surface to form an adhesive layer 3 μm thick (dry film thickness). A sealant layer was then bonded to the adhesive layer to produce a packaging laminate (outer layer substrate / printed layer / adhesive layer / sealant layer).

[0088] <Recycled resin content> For the laminates for packaging materials of the Examples, Comparative Examples and Reference Examples prepared as described above, the content of recycled resin in the laminates for packaging materials was calculated based on the following formula. Recycled resin content = 100 x total thickness of layers containing recycled resins / total thickness of laminate for packaging material However, when the layer containing the recycled resin is a layer containing a recycled resin and a resin derived from petroleum or biomass, the value obtained by multiplying the thickness of this layer by the content (mass%) of the recycled resin in the layer was used as the thickness value of the layer containing the recycled resin.

[0089] <Evaluation> The laminates for packaging materials of the Examples, Comparative Examples and Reference Examples prepared as described above were subjected to the following evaluations: Evaluation 1 (generation of odorous components), Evaluation 2 (fish eyes), Evaluation 3 (impurities) and Evaluation 4 (variation in dynamic friction force). Here, Evaluation 1 is an evaluation on quality, and Evaluations 2 and 3 are evaluations on hygiene.

[0090] (1) Rating 1 (Odor component generation) First, the laminate for packaging materials was analyzed using purge-and-trap gas chromatography mass spectrometry. Specifically, a 1.0 gram sample was cut out from the laminate for packaging materials, and this sample was placed in a 20 mL vial together with a collector for odor components, and heated at 60°C for 1 hour to adsorb the volatile components from the sample onto the collector. The volatile components in the collector were then analyzed using a purge-and-trap gas chromatography mass spectrometry device, and a total ion chromatogram was obtained. Next, in the total ion chromatogram obtained as described above, the ratio R1 of the peak area of ​​nonanal to the sum of the peak area values ​​of all the aliphatic hydrocarbon components, and the ratio R2 of the peak area of ​​decanal to the sum of the peak area values ​​of all the aliphatic hydrocarbon components, as indicators of odor components, were calculated. The evaluation was carried out based on the following evaluation criteria. The results are shown in Tables 1 to 3. (Evaluation Criteria) ◎ R1 is less than 1.5% and R2 is less than 0.35% ○ R1 is less than 1.5% and R2 is 0.35% or more, or R1 is 1.5% or more and R2 is less than 0.35% × R1 is 1.5% or more and R2 is 0.35% or more

[0091] (2) Rating 2 (Fisheye) A sample measuring 1 m x 1 m was cut out from the packaging laminate, and the sample was placed on a black table with the sealant layer facing up. Protrusions (protruding foreign matter) with a diameter of 0.5 mm or more and less than 1 mm were counted visually as fisheye 1, and protrusions (protruding foreign matter) with a diameter of 1 mm or more were counted visually as fisheye 2, and the number of protrusions (protruding foreign matter) was counted visually as fisheye 2, and the evaluation was performed based on the following evaluation criteria. The results are shown in Tables 1 to 3. (Evaluation Criteria) ◎ N1 is 10 or less and N2 is 0 ○ N1 is 11 to 99 and N2 is 0 × N1 is 100 or more or N2 is 1 or more

[0092] (3) Rating 3 (impurities) The laminate for packaging material was analyzed by Fourier transform infrared spectroscopy (FT-IR) using attenuated total reflection (ATR) to obtain an ATR spectrum. At this time, a diamond prism was used as the prism to be attached to the laminate for packaging material, and the angle of incidence to the surface of the laminate for packaging material was set to 45°. In addition, the 2915 cm spectrum, which is derived from polyethylene, -1 Absorption coefficients of CH inverse symmetric stretching of methylene groups near 1720 cm from polyesters and polyurethanes -1 The ratio R3 of the absorption coefficients of the C═O stretching near the nucleus was calculated and evaluated based on the following evaluation criteria. The results are shown in Tables 1 to 3. (Evaluation Criteria) ◎ R3 is less than 0.05 ○ R3 is 0.05 or more and less than 0.1 × R3 is 0.1 or more

[0093] (4) Rating 4 (variation in dynamic friction force) The kinetic friction force of the laminate for packaging materials was measured using a multi-function static and kinetic friction tester TL201Tt (manufactured by Trinity Lab Co., Ltd.) and a tactile tester. Specifically, the packaging laminate was placed on a test table with the sealant layer facing up, and a tactile probe was moved at a sliding speed of 10 mm / sec while being in contact with the packaging laminate (on the outer layer substrate side) with a load of 50 grams, and the standard deviation of the dynamic frictional force was obtained, and this standard deviation σ of the dynamic frictional force was taken as the variation in the dynamic frictional force. Evaluation was then performed based on the following evaluation criteria. The results are shown in Tables 1 to 3. (Evaluation Criteria) A σ is less than 0.35 B σ is 0.35 or more and less than 0.45 C σ is 0.45 or more

[0094] [Table 1] [Table 2] [Table 3]

[0095] The results shown in Tables 1 to 3 show that in all of the packaging laminates of Examples 1 to 10 using chemically recycled resin, even when the recycled resin content was increased to 10% by volume or more or 10% by mass or more, almost no odorous components were generated and the amount of foreign matter and impurities was small. In contrast, in the laminates for packaging materials of Comparative Examples 1 to 5, which used material recycled resin, when the recycled resin content was increased to 10% by volume or more or 10% by mass or more, at least one of the following occurred: an increased amount of odorous components, an increased number of fish eyes, and an increased amount of impurities.

[0096] In the above examples and comparative examples, the polyolefin resin is polyethylene. However, even if polypropylene is used as the polyolefin resin, the results are similar in terms of odor components, fish eyes, impurities, and dynamic friction coefficient due to the similarity of the resin structure.

[0097] From the above, it was confirmed that according to the laminate for packaging material of the present disclosure, hygiene and quality can be improved even if the content of recycled resin is sufficiently increased. [Explanation of symbols]

[0098] 10...outer layer substrate, 20...intermediate substrate, 30...sealant layer, 60...gas barrier layer, 100...laminate, 400...packaging bag (packaging container), 500...packaged article, C...contents.

Claims

1. A packaging laminate comprising an outer layer base material and a sealant layer, the sealant layer is a polyolefin resin film containing recycled resin, The content of the recycled resin in the laminate for packaging material is 10% by volume or more or 10% by mass or more, The laminate for packaging materials, wherein the recycled resin is a chemically recycled resin.

2. An adhesive layer is further provided between the outer layer base material and the sealant layer, The adhesive layer is an adhesive layer formed using an adhesive, 2. The laminate for packaging materials according to claim 1, wherein the adhesive is a urethane adhesive, a polyester adhesive, a polyamide adhesive, an epoxy adhesive, or an isocyanate adhesive.

Images