Printed resin film, laminate comprising the printed resin film, packaging container comprising the laminate, laminate comprising a polyester film, and packaging container comprising the laminate

Abstract

To provide a print resin film capable of reducing an environmental load and enabling a manufacture of a packaging container extremely superior in sanitary property.SOLUTION: A print resin film includes a polyester film and a print layer. The polyester film includes: a first polyester layer containing a chemically recycled polyester as a major constituent; a second polyester layer containing at least one kind selected from a group composed of a chemically recycled polyester, a mechanically recycled polyester, a fossil fuel polyester and a biomass polyester; and a third polyester layer containing a chemically recycled polyester as a major constituent. An area ratio of an area with molecular weight 1,000 or less in a molecular weight distribution curve obtained by measurement of GPC of the polyester film is 1.8% or less of a whole peak area.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a printed resin film, a laminate including the printed resin film, and a packaging container including the laminate. The present invention also relates to a laminate including a polyester film, and a packaging container including the laminate. [Background technology]

[0002] Conventionally, films made of resin materials (resin films) have been used as substrates (hereinafter referred to as substrates for packaging materials) constituting laminates used in the manufacture of packaging containers such as packaging bags, etc. As such films, for example, polyester films are widely used because they are excellent in mechanical properties, chemical stability, heat resistance, and transparency, and are inexpensive.

[0003] The fossil fuel polyesters used in the manufacture of polyester film are copolymers of dicarboxylic acids and diols, which are produced from the fossil fuel petroleum. In recent years, with the aim of reducing the environmental burden, such as by cutting carbon dioxide emissions, packaging containers have been produced using polyester obtained by mechanically recycling polyester contained in used packaging containers (hereinafter referred to as mechanically recycled polyester) instead of fossil fuel polyester (see Patent Document 1).

[0004] However, the degree of contamination of packaging containers varies depending on the contents filled in them and the storage environment. It is possible that consumers may be concerned about hygiene when using packaging containers made of mechanically recycled polyester. Therefore, from the viewpoint of hygiene, the use of chemically recycled polyester is being considered. Chemically recycled polyester is obtained by decomposing polyester contained in used packaging containers to the monomer level, removing contaminants, and then polymerizing it again, which is more hygienic. [Prior art documents] [Patent documents]

[0005]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0006] The laminate used in the production of the above-described packaging container includes at least a base material composed of a polyester film and a sealant layer, and is stored in a rolled-up state. When the polyester film used as the base material or the like contains a low molecular weight polymer, when the rolled laminate is stored, the low molecular weight polymer migrates to the sealant layer side, and the low molecular weight polymer may mix into the contents filled in the packaging container, which may impair the hygiene of the contents. The inventors have found a new problem.

[0007] The present invention has been made to solve the above problems. The problem to be solved by the present invention is to provide a printed resin film that can reduce the environmental load and enable the production of a packaging container with extremely excellent hygiene. Another problem to be solved by the present invention is to provide a laminate including the printed resin film. Another problem to be solved by the present invention is to provide a packaging container including the laminate.

[0008] Another problem to be solved by the present invention is to provide a laminate including a polyester film that can reduce the environmental load and enable the production of a packaging container with extremely excellent hygiene. Another problem to be solved by the present invention is to provide a packaging container including the laminate.

Means for Solving the Problems

[0009] The printed resin film of the present invention includes a polyester film and a printed layer, wherein the polyester film, A first polyester layer containing chemically recycled polyester as a main component; A second polyester layer including at least one selected from the group consisting of chemically recycled polyester, mechanically recycled polyester, fossil fuel polyester, and biomass polyester; A third polyester layer containing chemically recycled polyester as a main component; Equipped with The polyester film is characterized in that the area ratio of the region with a molecular weight of 1,000 or less in the molecular weight distribution curve obtained by GPC measurement of the polyester film is 1.8% or less of the total peak area.

[0010] In the printed resin film of the present invention, the polyester film may have a melting point of 250° C. or lower.

[0011] In the printed resin film of the present invention, the crystallization temperature of the polyester film may be 196° C. or lower.

[0012] In the printed resin film of the present invention, the static friction coefficient of the surface of the polyester film on which the printed layer is not formed may be 0.35 or more.

[0013] In the printed resin film of the present invention, the polyester content in each layer of the polyester film may be 90% by mass or more and 100% by mass or less.

[0014] In the printed resin film of the present invention, the chemically recycled polyester, the mechanically recycled polyester, the fossil fuel polyester, and the biomass polyester may be polyethylene terephthalate.

[0015] The laminate of the present invention comprises the printed resin film and and a sealant layer or an adhesive layer provided on the inner side of the printed resin film.

[0016] The laminate of the present invention includes a base layer and a sealant layer or an adhesive layer, The base layer is a polyester film, The polyester film is A first polyester layer containing chemically recycled polyester as a main component; A second polyester layer including at least one selected from the group consisting of chemically recycled polyester, mechanically recycled polyester, fossil fuel polyester, and biomass polyester; A third polyester layer containing chemically recycled polyester as a main component; Equipped with the area ratio of the region of molecular weight of 1,000 or less in the molecular weight distribution curve obtained by GPC measurement of the polyester film is 1.8% or less of the total peak area; The sealant layer or adhesive layer is provided on the inner side of the base layer.

[0017] The laminate of the present invention may further include an intermediate layer between the substrate layer and the sealant layer or the adhesive layer.

[0018] The laminate of the present invention further comprises a printed layer, The base layer and the printed layer may be composed of the above-mentioned printed resin film.

[0019] The laminate of the present invention includes a base layer, an intermediate layer, and a sealant layer or an adhesive layer in this order. the intermediate layer comprises a support layer; The support layer is a polyester film, The polyester film is A first polyester layer containing chemically recycled polyester as a main component; A second polyester layer including at least one selected from the group consisting of chemically recycled polyester, mechanically recycled polyester, fossil fuel polyester, and biomass polyester; A third polyester layer containing chemically recycled polyester as a main component; Equipped with the area ratio of the region of molecular weight of 1,000 or less in the molecular weight distribution curve obtained by GPC measurement of the polyester film is 1.8% or less of the total peak area; The sealant layer or adhesive layer is provided on the inside of the intermediate layer.

[0020] The laminate of the present invention further comprises a printed layer, The support layer and the printing layer may be composed of the above-mentioned printing resin film.

[0021] The packaging container of the present invention is characterized by comprising the above-mentioned laminate. Effect of the Invention

[0022] According to the present invention, it is possible to provide a printed resin film that can reduce the environmental load and enable the production of packaging containers that are extremely hygienic. According to the present invention, a laminate including the printed resin film can be provided. According to the present invention, a packaging container including the laminate can be provided.

[0023] According to the present invention, it is possible to provide a laminate including a polyester film, which can reduce the environmental load and enable the production of a packaging container that is extremely hygienic. According to the present invention, a packaging container including the laminate can be provided. [Brief description of the drawings]

[0024] [Figure 1] FIG. 1 is a schematic cross-sectional view showing one embodiment of a printed resin film 10 of the present invention. [Diagram 2] FIG. 1 is a schematic cross-sectional view showing one embodiment of a laminate 20 of the present invention. [Diagram 3] FIG. 1 is a schematic cross-sectional view showing one embodiment of a laminate 20 of the present invention. [Figure 4] FIG. 1 is a schematic cross-sectional view showing one embodiment of a laminate 20 of the present invention. [Diagram 5] FIG. 1 is a schematic cross-sectional view showing one embodiment of a laminate 20 of the present invention. [Figure 6] FIG. 1 is a schematic cross-sectional view showing one embodiment of a laminate 20 of the present invention. [Figure 7] FIG. 1 is a schematic cross-sectional view showing one embodiment of a laminate 20 of the present invention. [Figure 8] FIG. 1 is a schematic cross-sectional view showing one embodiment of a laminate 20 of the present invention. [Figure 9] FIG. 1 is a perspective view showing one embodiment of a standing pouch 30 produced using a laminate 20 of the present invention. [Figure 10] 1 is a front view showing one embodiment of a pillow bag 40 produced using a laminate 20 of the present invention. [Figure 11] FIG. 1 is a front view showing one embodiment of a three-sided sealed bag 50 produced using a laminate 20 of the present invention. [Figure 12] FIG. 1 is a front view showing one embodiment of a four-side sealed bag 60 produced using a laminate 20 of the present invention. [Figure 13] FIG. 1 is a schematic cross-sectional view showing one embodiment of a lid material 70 produced using a laminate 20 of the present invention. [Figure 14] 1 is a partial cross-sectional view showing one embodiment of a laminate tube 80 produced using a laminate 20 of the present invention. [Figure 15] FIG. 1 is a perspective view showing one embodiment of a paper container 90 manufactured using the laminate 20 of the present invention. [Figure 16] 1 is a perspective view showing one embodiment of a paper cup 100 manufactured using a laminate 20 of the present invention. [Figure 17] FIG. 17 is a schematic diagram for explaining a method of manufacturing the paper cup 100 shown in FIG. [Figure 18] FIG. 2 is a diagram showing a molecular weight distribution curve in the region of molecular weight of 1,000 or less obtained in the examples. [Figure 19] FIG. 1 is a diagram showing an example of a method for measuring puncture strength. [Figure 20] FIG. 2 is a diagram showing an example of a method for measuring seal strength. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0025] An embodiment of the present invention will be described with reference to Figures 1 to 20. In the drawings attached to this specification, the scale and aspect ratios have been appropriately changed and exaggerated from those of the actual objects for the convenience of illustration and ease of understanding.

[0026] In addition, terms used in this specification that specify shapes, geometric conditions, and the degree thereof, such as "parallel," "orthogonal," and "same," as well as values ​​of length and angle, are not to be bound by strict meanings, but are to be interpreted to include a range within which similar functions can be expected.

[0027] In this specification, the term "inside" refers to the side of the contents when the packaging container is manufactured, and the term "outside" refers to the side opposite the inside.

[0028] (Printed resin film 10) As shown in FIG. 1, a printed resin film 10 of the present invention comprises a polyester film 11 and a printed layer 12. As shown in FIG. 1, the polyester film 11 includes at least a first polyester layer 13, a second polyester layer 14, and a third polyester layer 15. In one embodiment, the printed resin film 10 can include a paper substrate layer between the polyester film 11 and the printed layer 12 (not shown). In one embodiment, the printed resin film 10 may have one or more adhesive layers, such as an adhesive layer, an adhesive resin layer, or an anchor coat layer, between the polyester film 11 and the paper base layer (not shown).

[0029] (Polyester film 11) Polyester film 11 is A first polyester layer 13 containing chemically recycled polyester as a main component; A second polyester layer 14 including at least one selected from the group consisting of chemically recycled polyester, mechanically recycled polyester, fossil fuel polyester, and biomass polyester; and a third polyester layer 15 containing chemically recycled polyester as a main component. This can improve the environmental load reduction of the printed resin film 10 including the polyester film 11 and the laminate 20 including the polyester film 11, and can provide the same puncture strength, retort resistance, and gas barrier properties as conventional fossil fuel polyester films. When a packaging container is produced using the polyester film 11 of the present invention, the first polyester layer 13 may be placed either on the inside or the outside.

[0030] As long as the characteristics of the present invention are not impaired, multiple polyester layers such as a fourth, fifth and sixth polyester layers (referred to as other polyester layers) may be provided on the first polyester layer 13 or under the third polyester layer 15, so that the polyester film 11 has a structure of four or more layers. The other polyester layer may contain chemically recycled polyester as a main component, or may contain chemically recycled polyester and at least one selected from the group consisting of mechanically recycled polyester, fossil fuel polyester, and biomass polyester.

[0031] In this specification, the term "polyester" refers to a material obtained by a polycondensation reaction between a diol compound and a dicarboxylic acid compound. Examples of dicarboxylic acid compounds include malonic acid, succinic acid, glutaric acid, adipic acid, suberic acid, sebacic acid, dodecanedioic acid, eicosanedioic acid, pimelic acid, azelaic acid, methylmalonic acid, ethylmalonic acid, adamantanedicarboxylic acid, norbornenedicarboxylic acid, cyclohexanedicarboxylic acid, decalindicarboxylic acid, terephthalic acid, isophthalic acid, phthalic acid, 1,4-naphthalenedicarboxylic acid, 1,5-naphthalenedicarboxylic acid, 2,6-naphthalenedicarboxylic acid, 1,8-naphthalenedicarboxylic acid, 4,4'-diphenyldicarboxylic acid, 4,4'-diphenyletherdicarboxylic acid, 5-sodiumsulfoisophthalic acid, phenylendanedicarboxylic acid, anthracenedicarboxylic acid, phenanthrenedicarboxylic acid, 9,9'-bis(4-carboxyphenyl)fluorene acid, and ester derivatives thereof. Examples of the diol compound include ethylene glycol, 1,2-propanediol, 1,3-propanediol, butanediol, 2-methyl-1,3-propanediol, hexanediol, neopentyl glycol, cyclohexanedimethanol, cyclohexanediethanol, decahydronaphthalenedimethanol, decahydronaphthalenediethanol, norbornanedimethanol, norbornanediethanol, tricyclodecanedimethanol, tricyclodecaneethanol, tetracyclododecanedimethanol, tetracyclododecanediethanol, decalindimethanol, decalindiethanol, Examples of the copolymer include 5-methylol-5-ethyl-2-(1,1-dimethyl-2-hydroxyethyl)-1,3-dioxane, cyclohexanediol, bicyclohexyl-4,4'-diol, 2,2-bis(4-hydroxycyclohexylpropane), 2,2-bis(4-(2-hydroxyethoxy)cyclohexyl)propane, cyclopentanediol, 3-methyl-1,2-cyclopentadiol, 4-cyclopentene-1,3-diol, adamantanediol, paraxylene glycol, bisphenol A, bisphenol S, styrene glycol, trimethylolpropane, and pentaerythritol. Furthermore, the polyester may contain a monomer other than the dicarboxylic acid compound and the diol compound, so long as the characteristics of the present invention are not impaired.

[0032] In addition, in this specification, "chemically recycled polyester" refers to a material obtained by collecting used polyester (e.g., at least one polyester selected from the group consisting of fossil fuel polyester, biomass polyester, chemically recycled polyester, and mechanically recycled polyester) containers, crushing, washing, separating foreign matter, and forming them into flakes or pellets, which are then depolymerized using ethylene glycol to decompose into bis-β-hydroxyethyl terephthalate (BHET), and polyester is polymerized again using BHET as a raw material. In addition, in this specification, "mechanically recycled polyester" refers to polyester (for example, at least one polyester selected from the group consisting of fossil fuel polyester, biomass polyester, chemically recycled polyester, and mechanically recycled polyester) containers, etc., which are collected, crushed, washed, separated from foreign matter, etc., and then regenerated into flakes or pellets. Note that the decomposition method, etc. is not limited to this. Moreover, the term "fossil fuel polyester" refers to a polyester in which a diol derived from a fossil fuel is used as a diol unit and a dicarboxylic acid derived from a fossil fuel is used as a dicarboxylic acid unit. The term "biomass polyester" refers to a polyester that contains ethylene glycol derived from biomass as a diol unit and a dicarboxylic acid derived from a fossil fuel as a dicarboxylic acid unit, or that contains ethylene glycol derived from biomass and a diol derived from a fossil fuel as diol units and a dicarboxylic acid derived from a fossil fuel as a dicarboxylic acid unit. Carbon dioxide in the atmosphere contains a certain percentage of C14 (105.5 pMC), so it is known that the C14 content in plants that grow by absorbing carbon dioxide from the atmosphere, such as corn, is also about 105.5 pMC. It is also known that fossil fuels contain almost no C14. Therefore, the percentage of carbon derived from biomass can be calculated by measuring the percentage of C14 in the total carbon atoms in polyester. Taking polyethylene terephthalate as an example, polyethylene terephthalate is a polymer of ethylene glycol containing 2 carbon atoms and terephthalic acid containing 8 carbon atoms in a molar ratio of 1:1. Therefore, if only biomass-derived ethylene glycol is used, the weight ratio of biomass-derived components in polyester is 31.25%, so the theoretical value of the biomass degree is 31.25%.

[0033] Moreover, "containing chemically recycled polyester as a main constituent" means that the first polyester layer or the second polyester layer contains 50% by mass or more of chemically recycled polyester relative to 100% by mass of the solid content contained in the first polyester layer or the second polyester layer.

[0034] The content of the chemically recycled polyester in the first polyester layer 13 is preferably 80% by mass or more and 100% by mass or less, and more preferably 90% by mass or more and 100% by mass or less. The first polyester layer 13 preferably contains polyester in an amount of 90% by mass or more and 100% by mass or less, and more preferably contains polyester in an amount of 95% by mass or more and 100% by mass or less.

[0035] Among the chemically recycled polyesters contained in the first polyester layer 13, chemically recycled polyethylene terephthalate is particularly preferred from the viewpoints of transparency and ease of recovery of used polyethylene terephthalate containers, which are the raw material. The first polyester layer 13 may contain two or more types of chemically recycled polyesters.

[0036] Within the range that does not impair the characteristics of the present invention, the first polyester layer 13 may contain a resin material other than chemically recycled polyester (hereinafter referred to as other resin materials). For example, fossil fuel polyester, biomass polyester, mechanically recycled polyester, (meth)acrylic resin, polyolefin, vinyl resin, cellulose resin, ionomer resin, and the like can be mentioned.

[0037] In the first polyester layer 13, the content of the resin material other than polyester is preferably 10% by mass or less, preferably 5% by mass or less, preferably 1% by mass or less, and particularly preferably not contained.

[0038] Also, within the range that does not impair the characteristics of the present invention, the first polyester layer 13 can contain additives. Examples of the additives include oxygen absorbers, plasticizers, ultraviolet stabilizers, antioxidants, anti-coloring agents, matting agents, deodorants, flame retardants, weathering agents, antistatic agents, friction reducers, slip agents, mold release agents, antioxidants, ion exchangers, antiblocking agents, and coloring agents.

[0039] The thickness of the first polyester layer 13 is preferably 1 μm or more and 12 μm or less, and preferably 2 μm or more and 6 μm or less. Thereby, an appropriate thickness and a layer ratio close to a symmetric shape are realized, and the film-forming property and the stability of physical properties are improved.

[0040] The second polyester layer 14 contains chemically recycled polyester and at least one selected from the group consisting of mechanically recycled polyester, fossil fuel polyester, and biomass polyester.

[0041] The content of the chemically recycled polyester in the second polyester layer 14 is not particularly limited as long as it satisfies the area ratio of the region of molecular weight of 1,000 or less in the molecular weight distribution curve obtained by GPC measurement of the polyester film 11 described below, but is preferably 20% by mass or more and 99% by mass or less, and more preferably 50% by mass or more and 99% by mass or less. The second polyester layer 14 may contain two or more types of chemically recycled polyesters.

[0042] The sum of the contents of the mechanically recycled polyester, fossil fuel polyester and biomass polyester in the second polyester layer 14 is not particularly limited as long as it satisfies the area proportion of the region with a molecular weight of 1,000 or less in the molecular weight distribution curve obtained by GPC measurement of the polyester film 11 described below, but is preferably 1% by mass or more and 80% by mass or less, and more preferably 1% by mass or more and 50% by mass or less.

[0043] The second polyester layer 14 preferably contains polyester in an amount of 90% by mass or more and 100% by mass or less, and more preferably contains polyester in an amount of 95% by mass or more and 100% by mass or less.

[0044] The chemically recycled polyester and at least one polyester selected from the group consisting of mechanically recycled polyester, fossil fuel polyester, and biomass polyester contained in the second polyester layer 14 are preferably polyethylene terephthalate, which improves the transparency of the polyester film 11 and facilitates the recovery of used containers.

[0045] As long as the characteristics of the present invention are not impaired, the second polyester layer 14 may contain a resin material other than polyester, such as (meth)acrylic resin, polyolefin, vinyl resin, cellulose resin, and ionomer resin.

[0046] In the second polyester layer 14, the content of resin materials other than polyester is preferably 10% by mass or less, more preferably 5% by mass or less, and even more preferably 1% by mass or less, and particularly preferably none.

[0047] Furthermore, the second polyester layer 14 may contain additives, provided that the properties of the present invention are not impaired. Examples of additives include oxygen absorbers, plasticizers, UV stabilizers, antioxidants, coloring inhibitors, matting agents, deodorants, flame retardants, weather resistance agents, antistatic agents, friction reducers, slip agents, release agents, antioxidants, ion exchange agents, antiblocking agents, and colorants.

[0048] The thickness of the second polyester layer 14 is preferably 1 μm or more and 12 μm or less, more preferably 2 μm or more and 6 μm or less, which realizes an appropriate thickness and a layer ratio that is nearly symmetrical, thereby improving the film-forming property and the stability of physical properties.

[0049] The content of the chemically recycled polyester in the third polyester layer 15 is preferably 80% by mass or more and 100% by mass or less, and more preferably 90% by mass or more and 100% by mass or less. The third polyester layer 15 preferably contains polyester in an amount of 90% by mass or more and 100% by mass or less, and more preferably contains polyester in an amount of 95% by mass or more and 100% by mass or less.

[0050] Among the chemically recycled polyesters contained in the third polyester layer 15, chemically recycled polyethylene terephthalate is particularly preferred from the viewpoints of transparency and ease of recovery of used containers. The third polyester layer 15 may contain two or more types of chemically recycled polyesters.

[0051] As long as the characteristics of the present invention are not impaired, the third polyester layer 15 may contain a resin material other than chemically recycled polyester (hereinafter referred to as other resin material), such as fossil fuel polyester, biomass polyester, mechanically recycled polyester, (meth)acrylic resin, polyolefin, vinyl resin, cellulose resin, and ionomer resin.

[0052] In the third polyester layer 15, the content of resin materials other than polyester is preferably 10% by mass or less, more preferably 5% by mass or less, and even more preferably 1% by mass or less, and particularly preferably none.

[0053] Furthermore, the third polyester layer 15 may contain additives, provided that the properties of the present invention are not impaired. Examples of the additives include oxygen absorbers, plasticizers, UV stabilizers, antioxidants, coloring inhibitors, matting agents, deodorants, flame retardants, weather resistance agents, antistatic agents, friction reducers, slip agents, release agents, antioxidants, ion exchange agents, antiblocking agents, and colorants.

[0054] The thickness of the third polyester layer 15 is preferably 1 μm or more and 12 μm or less, more preferably 2 μm or more and 6 μm or less, which realizes an appropriate thickness and a layer ratio that is nearly symmetrical, thereby improving the stability of film-forming properties and physical properties.

[0055] The configuration of the third polyester layer 15 may be the same as or different from the configuration of the first polyester layer 13.

[0056] The polyester film 11 is characterized in that the area ratio of the region with a molecular weight of 1,000 or less in the molecular weight distribution curve obtained by measuring the polyester film 11 by GPC (gel permeation chromatography) is 1.8% or less of the total peak area. Since such polyester film 11 has a reduced content of components with a molecular weight of 1,000 or less (hereinafter also referred to as low molecular weight components), it is possible to suppress the inclusion of low molecular weight components in the contents filled in the packaging container, and to improve the hygiene of the packaging container manufactured using the printed resin film of the present invention. It is more preferable that the area ratio of the region having a molecular weight of 1,000 or less is 1.7% or less of the total peak area. From the viewpoint of hygiene, it is preferable that the area ratio of the region having a molecular weight of 1,000 or less is smaller relative to the total peak area, but the area ratio of the region having a molecular weight of 1,000 or less may be, for example, 0.01% or more of the total peak area.

[0057] The GPC measurement of the polyester film 11 is carried out in accordance with JIS K 7252-1:2008. Specifically, 10 g of the polyester film 11 is cut out and weighed in a 30 mL vial, and a HFIP / chloroform mixture is added to the vial, which is then left to stand for 12 hours to dissolve. After allowing to stand, add chloroform to dilute and prepare a 0.1% solution. This solution is filtered using a 0.45 μm hydrophilic PTFE membrane filter cartridge (Millex-LH, manufactured by Merck Millipore), and the obtained filtrate is subjected to GPC measurement under the following conditions. (Measurement conditions) Columns used: Agilent Technologies, 2 PLgel 5μ MIXED (7.5mm x 300mm) Column temperature: 40℃ Mobile phase: Chloroform (Fujifilm Wako Pure Chemical Industries, Ltd., for liquid chromatography) ·Flow rate: 1.0mL / min ·Injection volume: 2.5μL Detection: 254nm (UV-Visible detector) Molecular weight calibration: Monodisperse polystyrene (Agilent Technologies, PS-1) Equipment: 515 HPLC pump, 717plus automatic injection device, UV-visible detector (Waters)

[0058] The melting point of the polyester film 11 is preferably 250° C. or less, and more preferably 248.5° C. or less, which allows the polyester film 11 to be formed at a high speed, that is, improves the film formability.

[0059] The melting point of the polyester film 11 is preferably 230° C. or higher, and more preferably 240° C. or higher, so that the heat resistance of the polyester film 11 can be improved.

[0060] The crystallization temperature of the polyester film 11 is preferably 196° C. or lower, and more preferably 195° C. or lower, which can improve the stretching stability of the polyester film 11, that is, improve the film-forming properties. The crystallization temperature of the polyester film 11 is preferably 185° C. or higher, and more preferably 190° C. or higher, so that the heat resistance of the polyester film 11 can be improved.

[0061] In this specification, the "melting point" and "crystallization temperature" are measured by differential scanning calorimetry (DSC) in accordance with JIS K 7121:2012 as follows. First, (1) a polyester film sample (5 mg) is heated from 20°C to 300°C at a rate of 10°C / min. (2) It is then held at 300°C for 5 minutes. (3) It is then cooled from 300°C to 20°C at a rate of -10°C / min. (4) It is then held at 20°C for 5 minutes. (5) It is again heated from 20°C to 300°C at a rate of 10°C / min. This gives a melting curve. The main peak in the temperature-lowering stage of this melting curve was taken as the crystallization temperature, and the main peak in the second temperature-up stage was taken as the melting point.

[0062] The static friction coefficient of the non-printed surface of the polyester film 11 is preferably 0.35 or more, and more preferably 0.40 or more, which can suppress excessive slippage on the surface of the packaging container manufactured using the printed resin film of the present invention and improve the stacking stability when stacked. The static friction coefficient of the non-printed surface of the polyester film 11 is preferably 0.60 or less, and more preferably 0.50 or less, which stabilizes the running performance in a packaging machine and improves the high-speed filling and packaging performance. The static friction coefficient of the polyester film 11 can be measured in accordance with JIS K 7125:1999 as follows.

[0063] First, the printed resin film 10 is cut to prepare a test piece of 200 mm×150 mm. Next, this test piece is attached and fixed to the sliding table of the tester with cellophane tape so that the polyester film 11 faces upward. Next, the printed resin film 10 is cut to prepare a test piece of 70 mm x 100 mm. The test piece is then wrapped around a 63 mm×63 mm×6.3 mm metal thread (weight 200 g) with the printed layer on the inside and the polyester film 11 on the outside. Next, the polyester films 11 are placed on the fixed printed resin film 10 so that the polyester films 11 are in contact with each other. Next, in an environment of 23° C. and a relative humidity of 50%, the metal thread around which the test piece is wound is slid at a speed of 100 mm / min, and the friction is measured using a friction meter.

[0064] In the printed resin film 10 according to the present invention, the content of the cyclic trimer in the polyester film 11 is preferably 0.510% by mass to 1.030% by mass, more preferably 0.600% by mass to 1.010% by mass, and even more preferably 0.650% by mass to 1.000% by mass. By setting the content of the cyclic trimer within this range, it is possible to suitably produce the polyester film 11 having the above-mentioned melting point and crystallization temperature, and the printed resin film having the above-mentioned static friction coefficient.

[0065] The content of the cyclic trimer in the polyester film 11 can be measured by the following method. Approximately 0.1 g of a sample is taken from the polyester film 11 and dissolved in a mixture of hexafluoroisopropanol (HFIP) and chloroform. Acetonitrile is added to this solution to precipitate the polymer, and the precipitate is then filtered. The filtrate is evaporated to dryness, and the resulting residue is dissolved in dimethylformamide (DMF). This solution is analyzed by high performance liquid chromatography (HPLC) to measure the content of cyclic trimers. The measurement conditions are as follows: (Measurement conditions) Equipment: Shimadzu Corporation, LC-20 Column used: Nomura Chemical Co., Ltd., Develosil ODS-HG-3 3μ (4.6×150mm) Column temperature: 40℃ Mobile phase: 0.5% acetic acid aqueous solution / acetonitrile (gradient) ·Flow rate: 1.0mL / min ·Injection volume: 15μL Detection: 254nm (UV-Visible detector) Equipment: Shimadzu Corporation, LC-20

[0066] The polyester film 11 may be a stretched film or an unstretched film, but is preferably a stretched film from the viewpoints of heat resistance, strength, and transparency. The stretched film may be a uniaxially stretched film or a biaxially stretched film. From the viewpoint of dimensional stability, it is preferably a biaxially stretched film.

[0067] The polyester film 11 may be subjected to a surface treatment, which can improve adhesion between adjacent layers. The surface treatment method is not particularly limited, and examples thereof include corona treatment, ozone treatment, and frame treatment.

[0068] The thickness of the polyester film 11 is preferably 3 μm or more and 25 μm or less, more preferably 6 μm or more and 25 μm or less, even more preferably 7 μm or more and 16 μm or less, and even more preferably 9 μm or more and 16 μm or less, which can improve the printability, heat resistance, and strength of the polyester film 11.

[0069] (Method of manufacturing polyester film 11) The polyester film 11, in which the area ratio of the region with a molecular weight of 1,000 or less in the molecular weight distribution curve obtained by GPC measurement is 1.8% or less of the total peak area, can be produced by appropriately selecting the types of monomers and oligomers as raw materials and / or appropriately adjusting the contents of the monomers and oligomers as raw materials. In addition, since the low molecular weight components act as wax, the friction of the polyester film 11 can be adjusted by adjusting the content of the low molecular weight components. In one embodiment, the crystallization temperature and melting point of the polyester film 11 can be adjusted by using, for example, a compound containing isophthalic acid as the dicarboxylic acid compound. The method for producing the film is not particularly limited, and the film can be produced by utilizing a conventionally known method, for example, a T-die method.

[0070] The polyester film 11 is preferably produced by co-extrusion film formation, and the co-extrusion film formation can be carried out, for example, by utilizing a T-die method or the like. As long as the characteristics of the present invention, particularly the area ratio of the region of molecular weight of 1,000 or less in the molecular weight distribution curve obtained by GPC measurement of the polyester film 11 described later, are satisfied, a thermoplastic resin may be interposed between the first polyester layer 13 and the second polyester layer 14, and / or between the second polyester layer 14 and the third polyester layer 15, and coextrusion film formation may be performed.

[0071] (Print layer 12) The printed resin film 10 of the present invention includes a printed layer 12 on at least one surface of the first polyester layer and the third polyester layer of a polyester film 11 . The printed layer 12 may be provided on the inside or outside of the polyester film 11 . Furthermore, when the printed resin film 10 of the present invention comprises a paper substrate, the printed layer may be formed on this paper substrate.

[0072] The image formed on the print layer is not particularly limited, and may represent characters, patterns, symbols, combinations thereof, or the like. Moreover, it may be formed on a part of the surface, or on the entire surface.

[0073] The image formed as the print layer 12 is not particularly limited, and may represent characters, patterns, symbols, combinations thereof, or the like. The printed layer 12 may be formed on a part of the surface of the polyester film 11 or on the entire surface.

[0074] The printing layer 12 can be formed by appropriately selecting and using a conventionally known ink. In consideration of the environmental load, ink made from raw materials derived from biomass may be used. As the ink containing a raw material derived from biomass, commercially available inks can be used, for example, the LP Bio series manufactured by Toyo Ink Co., Ltd. and the Finart BM series manufactured by DIC Graphics Corporation.

[0075] The method for forming the printed layer 12 is not particularly limited, and examples of the method include conventionally known printing methods such as gravure printing, offset printing, and flexographic printing.

[0076] (Paper base material) The printed resin film 10 of the present invention can include a paper base material between the polyester film 11 and the printed layer 12. This makes it possible to use the printed resin film 10 to produce packaging containers such as paper containers and paper cups. The paper substrate may be provided on the inside or outside of the polyester film 11 .

[0077] The paper substrate can be appropriately selected from among fine paper, art paper, coated paper, resin coated paper, cast coated paper, paperboard, synthetic paper, and impregnated paper depending on the application.

[0078] The thickness of the paper base material is preferably changed depending on the application. For example, the thickness of the paper base material is 30 g / m 2 More than 400g / m 2 It can be as follows:

[0079] The paper substrate can be laminated onto the polyester film 11 via one or more adhesive layers, such as an adhesive layer, an adhesive resin layer, or an anchor coat layer.

[0080] (adhesive layer) The adhesive layer is a layer provided between the polyester film 11 and the paper substrate of the printed resin film 10 of the present invention, or between any layers of the laminate 20 of the present invention described below. The adhesive layer can be formed by applying a conventionally known adhesive (laminating adhesive) and drying it.

[0081] The laminating adhesive may be a one-component curing type or a two-component curing type. The laminating adhesive may be any of a solvent-based, water-based, and emulsion-based adhesive. Examples of adhesives for lamination include vinyl-based adhesives, (meth)acrylic-based adhesives, polyamide-based adhesives, polyester-based adhesives, polyether-based adhesives, polyurethane-based adhesives, epoxy-based adhesives, and rubber-based adhesives.

[0082] The coating method is not particularly limited, and examples thereof include direct gravure roll coating, gravure roll coating, kiss coating, reverse roll coating, Fontaine method, and transfer roll coating.

[0083] The thickness of the adhesive layer is preferably 0.1 μm or more and 10 μm or less, and more preferably 1 μm or more and 5 μm or less.

[0084] (Adhesive resin layer) The adhesive resin layer is a layer provided between the polyester film 11 and the paper substrate of the printing resin film 10 of the present invention, or between any layers of the laminate 20 of the present invention described below. The adhesive resin layer is a layer formed by melt extrusion lamination using a thermoplastic resin. Examples of the thermoplastic resin include low density polyethylene, medium density polyethylene, high density polyethylene, linear low density polyethylene, ethylene-acrylic acid copolymer, ethylene-ethyl acrylate copolymer, ethylene-methacrylic acid copolymer, ethylene-methyl methacrylate copolymer, ethylene-maleic acid copolymer, ionomer resin, resin obtained by graft polymerizing or copolymerizing an unsaturated carboxylic acid, an unsaturated carboxylic acid anhydride, or an ester monomer with a polyolefin resin, and resin obtained by graft-modifying maleic anhydride with a polyolefin resin. The adhesive resin layer may contain two or more types of thermoplastic resin.

[0085] In one embodiment, the thickness of the adhesive resin layer is preferably 0.1 μm or more and 10 μm or less, and more preferably 1 μm or more and 5 μm or less. In one embodiment, the thickness of the adhesive resin layer is preferably 5 μm or more and 100 μm or less, and more preferably 10 μm or more and 50 μm or less.

[0086] (Anchor coat layer) The anchor coat layer is a layer provided between the polyester film 11 and the paper substrate of the printed resin film 10 of the present invention, or between any layers of the laminate 20 of the present invention described below. The anchor coat layer can be formed by applying a conventionally known anchor coat agent and drying it.

[0087] The anchor coating agent may be any resin having a heat resistance of 135°C or higher, such as a vinyl modified resin, an epoxy resin, a urethane resin, or a polyester resin. In particular, an anchor coating agent made of a polyacrylic or polymethacrylic resin having two or more hydroxyl groups in the structure and an isocyanate compound as a curing agent can be preferably used. A silane coupling agent may be added to the anchor coating agent as an additive. Nitrocellulose may be added to the anchor coating agent to improve heat resistance.

[0088] The thickness of the anchor coat layer is preferably 0.1 μm or more and 2 μm or less, and more preferably 0.2 μm or more and 1 μm or less.

[0089] (Laminate 20) In one embodiment, as shown in Fig. 2, the laminate 20 of the present invention includes the above-mentioned printed resin film 10 and a sealant layer 21 located on the inner side of the printed resin film 10. The sealant layer 21 may constitute the innermost layer of the laminate 20. The printed resin film 10 may constitute the outermost layer of the laminate 20. The laminate 20 may have a polyester film 11 that constitutes the outermost layer (Fig. 2), or a printed layer 12 that constitutes the outermost layer (not shown). 3, the laminate 20 of the present invention may include a first sealant layer 22 on the inner side of the printed resin film 10, and a second sealant layer 23 on the outer side of the printed resin film 10. The first sealant layer 22 may constitute the innermost layer or the outermost layer of the laminate 20. The second sealant layer 23 may constitute the innermost layer or the outermost layer of the laminate 20. In one embodiment, as shown in FIG. 4, the laminate 20 of the present invention includes a vapor-deposited film 24 between the printed resin film 10 and the sealant layer 21. The sealant layer 21 may constitute the innermost layer of the laminate 20. The printed resin film 10 may constitute the outermost layer of the laminate 20. The polyester film 11 may constitute the outermost layer of the laminate 20 (FIG. 4), or the printed layer 12 may constitute the outermost layer (not shown). The laminate 10 may include an adhesive layer between the printed layer 12 and the vapor-deposited film 24 (not shown). The vapor-deposited film 24 may be provided on the outer side of the printed resin film 10 (not shown). The laminate 20 of the present invention may also include a gas barrier coating film adjacent to the vapor-deposited film 24 (not shown). 5, the laminate 20 of the present invention includes a base layer 25 and a sealant layer 21, and the sealant layer 21 is provided on the inside of the base layer 25. The sealant layer 21 may constitute the innermost layer of the laminate 20. The base layer 25 may constitute the outermost layer of the laminate 20. As shown in FIG. 6, the laminate 20 of the present invention may include a printed layer 12. In one embodiment, as shown in Fig. 7, the laminate 20 of the present invention includes a base layer 25, an intermediate layer 26, and a sealant layer 21 in this order, and the sealant layer 21 is provided on the inner side of the intermediate layer. As shown in Fig. 7, the laminate 20 of the present invention may include an intermediate layer 26 between the base layer 25 and the sealant layer 21. The sealant layer 21 may constitute the innermost layer of the laminate 20. The base layer 25 may constitute the outermost layer of the laminate 20. As shown in Fig. 8, the laminate 20 of the present invention may include a printed layer 12. The laminate 20 of the present invention may have one or more adhesive layers between any of the layers (not shown). The laminate 20 of the present invention may have an optional layer (not shown) between the printed resin film 10 and the sealant layer 21 and on the outer side of the printed resin film 10. In the laminate of the present invention and the packaging container including the laminate of the present invention, the number of layers does not need to include the printed layer, the vapor deposition film, the gas barrier coating film, the adhesive layer, the adhesive resin layer, and the anchor coat layer. For example, when the laminate includes a printed layer, a base layer, and a sealant layer, the number of layers of the laminate may be counted as two. Hereinafter, each layer of the laminate of the present invention will be described, but as the printed resin film 10, adhesive layer and adhesive resin layer have been described above, a description thereof will be omitted here.

[0090] (Sealant layer 21) The sealant layer 21 includes a resin material that exhibits heat fusion properties. Examples of the resin material that exhibits heat fusion properties include low-density polyethylene (LDPE: density 0.910 to 0.925), medium-density polyethylene (MDPE: density 0.926 to 0.940), high-density polyethylene (HDPE: density 0.941 or higher), linear low-density polyethylene (LLDPE: density 0.910 to 0.925), ethylene-α-olefin copolymer, polypropylene (homopolymer, block polymer, random polymer), ethylene-vinyl acetate copolymer (EVA), ethylene-acrylic acid copolymer (EAA), ethylene-ethyl acrylate copolymer (EEA), ethylene-methacrylic acid copolymer, and the like. Examples of the resin material include ethylene-vinyl alcohol copolymer (EMAA), ethylene-methyl methacrylate copolymer (EMMA), ionomer resin, heat-sealable ethylene-vinyl alcohol resin, or copolymerized resin, polyolefin resin such as methylpentene resin, ethylene-propylene copolymer, methylpentene polymer, polybutene polymer, polyethylene, polypropylene, and cyclic olefin copolymer, acid-modified polyolefin resin obtained by modifying polyolefin resin with unsaturated carboxylic acid such as acrylic acid, methacrylic acid, maleic acid, maleic anhydride, fumaric acid, and itaconic acid, vinyl resin, and (meth)acrylic resin. The sealant layer 21 may contain two or more of the above resin materials. Examples of the sealant layer 21 include a heat seal layer and a hot melt layer using a hot melt adhesive containing the above-mentioned resin material.

[0091] When polyethylene is used for the sealant layer 21, biomass polyethylene may be used as the polyethylene. This can further reduce the environmental impact in the production of the laminate 20 of the present invention. Here, biomass polyethylene is produced using biomass ethanol as a raw material. The method for producing biomass polyethylene is not particularly limited, and it can be obtained by a conventionally known method. Biomass polyethylene can be produced using biomass ethanol as a raw material, and it is particularly preferable to use fermented ethanol derived from biomass obtained from a plant raw material. The plant raw material is not particularly limited, and conventionally known plants can be used. For example, corn, sugar cane, beet, and manioc can be mentioned.

[0092] As long as the properties of the present invention are not impaired, the sealant layer 21 may contain additives, such as oxygen absorbers, plasticizers, ultraviolet stabilizers, antioxidants, coloring inhibitors, matting agents, deodorants, flame retardants, weather resistance agents, antistatic agents, friction reducers, slip agents, mold release agents, antioxidants, ion exchange agents, antiblocking agents, and colorants.

[0093] The thickness of the sealant layer 21 is preferably adjusted appropriately depending on the application of the laminate 20, and can be, for example, 7 μm or more and 50 μm or less. Furthermore, the sealant layer 21 may be a single layer or a multi-layer.

[0094] The laminate 20 of the present invention may have a sealant layer 21 on the inner surface of the printed resin film 10, or may have sealant layers (a first sealant layer 22 and a second sealant layer 23) on both the inner and outer surfaces of the printed resin film 10. By providing sealant layers 21 on both sides of the printed resin film, it becomes possible to produce packaging containers such as laminated tubes, labels, and paper containers. The composition and thickness of the first and second sealant layers may be the same or different.

[0095] The laminate 20 of the present invention may include a sealant layer 21 on the inner surface of the base layer 25, or may include sealant layers (a first sealant layer and a second sealant layer) on the inner and outer surfaces of the base layer 25. By providing the sealant layer 21 on both sides of the base material layer, it becomes possible to produce packaging containers such as laminate tubes, labels, and paper containers. The composition and thickness of the first and second sealant layers may be the same or different.

[0096] The sealant layer 21 can be formed by melt-extruding the above-mentioned resin material onto the printed resin film 10 and then cooling it. An anchor coat layer may be formed on the printed resin film 10, and the above-mentioned resin material may be melt-extruded onto the anchor coat layer. The sealant layer 21 can be formed by laminating a film made of the above-mentioned resin material onto the printed resin film 10 via an adhesive layer using a dry lamination method. The sealant layer 21 can be formed by laminating a film made of the above-mentioned resin material onto the printed resin film 10 via an adhesive resin layer by utilizing a melt extrusion lamination method. The sealant layer 21 can be formed on the printed resin film 10 using a hot melt adhesive or a pressure sensitive adhesive.

[0097] The sealant layer 21 can be formed by melt-extruding the resin material onto the base layer 25 or the support layer, and then cooling it. Alternatively, an anchor coat layer may be formed on the base layer 25 or the support layer, and the resin material may be melt-extruded onto the anchor coat layer. The sealant layer 21 can be formed by laminating a film made of the above-mentioned resin material to the base material layer 25 or support layer via an adhesive layer or anchor coat layer using a dry lamination method. The sealant layer 21 can be formed by laminating a film made of the above-mentioned resin material to the base material layer 25 or the support layer via an adhesive resin layer by utilizing a melt extrusion lamination method. The sealant layer 21 can be formed on the printed resin film 10 using a hot melt adhesive or a pressure sensitive adhesive.

[0098] The laminate of the present invention may include an adhesive layer instead of the sealant layer 21. The adhesive layer contains an adhesive. Examples of the adhesive contained in the adhesive layer include natural rubber, synthetic rubber such as styrene butadiene rubber, acrylonitrile-butadiene rubber, and polyisobutylene rubber, acrylic resin, silicone resin, and polypropylene. The adhesive layer may contain two or more types of the above adhesives.

[0099] (Deposition film 24) The laminate 20 of the present invention may have a vapor-deposited film 24. This can improve the gas barrier properties, specifically the oxygen barrier properties and water vapor barrier properties. The deposited film 24 may be a deposited film of one or more inorganic substances or inorganic oxides, such as silicon (Si), aluminum (Al), magnesium (Mg), calcium (Ca), potassium (K), tin (Sn), sodium (Na), boron (B), titanium (Ti), lead (Pb), zirconium (Zr), yttrium (Y), etc. The deposited film 24 may be configured with two or more layers, which may be made of the same material or different materials.

[0100] The thickness of the vapor-deposited film 24 is preferably 10 nm or more and 200 nm or less, and more preferably 20 nm or more and 100 nm or less.

[0101] The method for forming the vapor deposition film 24 is not particularly limited, and examples thereof include physical vapor deposition methods (PVD methods) such as vacuum deposition, sputtering, and ion plating, and chemical vapor deposition methods (CVD methods) such as plasma chemical vapor deposition, thermal chemical vapor deposition, and photochemical vapor deposition.

[0102] (Gas barrier coating film) The laminate 20 of the present invention can be provided with a gas barrier coating film adjacent to the vapor deposition film 24. The gas barrier coating film functions as a layer that suppresses the permeation of oxygen gas, water vapor, and the like.

[0103] The gas barrier coating film is represented by the general formula R 1 n M(OR 2 ) m (In the formula, R 1 , R 2 represents an organic group having 1 to 8 carbon atoms, M represents a metal atom, n represents an integer of 0 or more, m represents an integer of 1 or more, and n+m represents the atomic valence of M.) and the above-mentioned polyvinyl alcohol resin and / or ethylene-vinyl alcohol copolymer, and further, the gas barrier composition is obtained by polycondensation by a sol-gel method in the presence of a sol-gel catalyst, an acid, water, and an organic solvent.

[0104] The above general formula R 1 n M(OR 2 ) m As the alkoxide represented by the formula (I), at least one of a partial hydrolyzate of an alkoxide and a condensate of hydrolysis of an alkoxide can be used. In addition, as the partial hydrolyzate of an alkoxide, it is not necessary that all alkoxy groups are hydrolyzed, and one or more alkoxy groups may be hydrolyzed, or a mixture thereof. As the condensate of hydrolysis of an alkoxide, a dimer or more of a partially hydrolyzed alkoxide, specifically, a dimer to hexamer, is used.

[0105] The above general formula R 1 n M(OR 2 ) mIn the alkoxide represented by , as the metal atom represented by M, silicon, zirconium, titanium, aluminum, and others can be used. In this embodiment, preferable metals include, for example, silicon, titanium, and the like. Also, in the present invention, as a method of using the alkoxide, it can be used alone or by mixing alkoxides of two or more different metal atoms in the same solution.

[0106] Also, in the above general formula R 1 n M(OR 2 ) m In the alkoxide represented by , specific examples of the organic group represented by R 1 include, for example, alkyl groups such as methyl group, ethyl group, n-propyl group, i-propyl group, n-butyl group, i-butyl group, sec-butyl group, t-butyl group, n-hexyl group, n-octyl group, and others. Also, in the above general formula R 1 n M(OR 2 ) m In the alkoxide represented by , specific examples of the organic group represented by R 2 include, for example, methyl group, ethyl group, n-propyl group, i-propyl group, n-butyl group, sec-butyl group, and others. Note that these alkyl groups in the same molecule may be the same or different.

[0107] When preparing the above gas barrier composition, for example, a silane coupling agent or the like may be added. As the above silane coupling agent, a known organoalkoxysilane containing an organic reactive group can be used. In this embodiment, in particular, an organoalkoxysilane having an epoxy group is preferably used, and specifically, for example, γ-glycidoxypropyltrimethoxysilane, γ-glycidoxypropylmethyldiethoxysilane, or β-(3,4-epoxycyclohexyl)ethyltrimethoxysilane can be used. The above silane coupling agent may be used alone or as a mixture of two or more.

[0108] (Substrate layer 25) The base layer 25 serves to hold each layer. The base layer 25 is preferably one that can impart strength to the laminate 20 as a packaging container. As the base layer 25, a resin film (which may be a stretched film or an unstretched film) containing at least one or two or more resin materials such as polyester (chemically recycled polyester, mechanically recycled polyester, fossil fuel polyester, biomass polyester), (meth)acrylic resin, polyolefin such as polyethylene, polypropylene, and polymethylpentene, vinyl resin, cellulose resin, ionomer resin, and polyamide such as nylon 6, nylon 6,6, and polymetaxylylene adipamide (MXD6) can be used. The resin film is preferably a stretched film. The stretched film may be a uniaxially stretched film or a biaxially stretched film. From the viewpoint of dimensional stability, a biaxially stretched film is preferable. As the base layer 25, a laminated film of the above-mentioned materials may be used. The base material layer 25 may be the above-mentioned paper base material.

[0109] In one embodiment, the base layer 25 is a resin film containing polyester. In one embodiment, the base layer 25 is a resin film containing polyester as a main constituent, and the polyester content is preferably 90% by mass or more, and more preferably 95% by mass or more. It is preferable that the base layer 25 contains recycled polyester as the polyester, which can further reduce the environmental impact of the packaging container formed of the laminate 20 of the present invention. The above-mentioned polyester film 11 may be used as the base layer 25. This can further reduce the environmental load and effectively prevent migration of low molecular weight polymers to the sealant layer 21, thereby further improving the hygiene of the packaging container produced from the laminate 20 of the present invention.

[0110] When the laminate 20 of the present invention includes a printed layer 12, the base layer 25 and the printed layer 12 may be composed of the above-mentioned printed resin film 10.

[0111] As long as the characteristics of the present invention are not impaired, the base layer 25 may contain additives, such as oxygen absorbers, plasticizers, ultraviolet stabilizers, antioxidants, coloring inhibitors, matting agents, deodorants, flame retardants, weather resistance agents, antistatic agents, friction reducers, slip agents, mold release agents, antioxidants, ion exchange agents, antiblocking agents, and colorants. The thickness of the base layer 25 is not particularly limited, and is preferably changed appropriately depending on the application of the laminate 20.

[0112] The laminate 20 of the present invention may have the above-mentioned vapor-deposited film 24 on one surface of the base layer 25. The laminate 20 may have a gas barrier coating film on the vapor-deposited film 24.

[0113] The base material layer 25 can be laminated via an adhesive layer.

[0114] (Middle class 26) The laminate 20 of the present invention may include an intermediate layer 26 between the base layer 25 and the sealant layer 21. The intermediate layer 26 is a layer including a support layer intended to improve the strength, etc., of the laminate 20, a gas barrier layer intended to improve the gas barrier properties of the laminate 20, and a metal foil, etc. It is preferable that the intermediate layer 26 includes a support layer.

[0115] (Support layer) The support layer is a layer provided for the purpose of improving the strength and stiffness of the laminate 20. As the support layer, for example, a resin film (which may be a stretched film or an unstretched film) containing one or more resin materials such as polyester (chemically recycled polyester, mechanically recycled polyester, fossil fuel polyester, biomass polyester), (meth)acrylic resin, polyolefin such as polyethylene, polypropylene, and polymethylpentene, vinyl resin, cellulose resin, ionomer resin, and polyamide such as nylon 6, nylon 6,6, and polymetaxylylene adipamide (MXD6) can be used. The resin film is preferably a stretched film. The stretched film may be a uniaxially stretched film or a biaxially stretched film. From the viewpoint of dimensional stability, a biaxially stretched film is preferable. A laminated film of the above-mentioned material may be used as the support layer. As the support layer, the above-mentioned paper base material may be used.

[0116] In one embodiment, the support layer is a resin film comprising polyester. In one embodiment, the support layer is a resin film containing polyester as a main component, and the polyester content is preferably 90% by mass or more, and more preferably 95% by mass or more. The support layer preferably contains recycled polyester as the polyester, which can further reduce the environmental impact of the packaging container formed of the laminate 20 of the present invention. The above-mentioned polyester film 11 may be used as the support layer. This can further reduce the environmental load and effectively prevent migration of low molecular weight polymers to the sealant layer 21, thereby further improving the hygiene of the packaging container manufactured from the laminate 20 of the present invention.

[0117] When the laminate 20 of the present invention includes a printed layer 12, the support layer and the printed layer 12 may be composed of the above-mentioned printed resin film 10.

[0118] The support layer may contain additives, as long as they do not impair the properties of the present invention. Examples of the additives include oxygen absorbers, plasticizers, ultraviolet stabilizers, antioxidants, coloring inhibitors, matting agents, deodorants, flame retardants, weather resistance agents, antistatic agents, friction reducers, slip agents, mold release agents, antioxidants, ion exchange agents, antiblocking agents, and colorants. The thickness of the support layer is not particularly limited, and it is preferable to change it appropriately depending on the application of the laminate 20.

[0119] The laminate 20 of the present invention may have the above-mentioned vapor-deposited film on one side of the support layer. The laminate 20 may have a gas barrier coating film on the vapor-deposited film 24.

[0120] The support layer can be laminated via an adhesive layer.

[0121] (Gas barrier layer) In one embodiment, the gas barrier layer contains a gas barrier resin. Examples of the gas barrier resin include ethylene-vinyl alcohol copolymer (EVOH), polyvinyl alcohol, polyacrylonitrile, polyamides such as nylon 6, nylon 6,6, and polymetaxylylene adipamide (MXD6), polyesters, polyurethanes, and (meth)acrylic resins. The gas barrier layer may contain two or more types of gas barrier resins. The gas barrier layer may contain a resin other than the gas barrier resin, and may contain the above-mentioned additives. The thickness of the gas barrier layer made of a gas barrier resin is preferably 3 μm to 30 μm, more preferably 5 μm to 20 μm. By making the thickness of the gas barrier layer 7 μm or more, the oxygen barrier property and water vapor barrier property of the laminate 20 of the present invention can be further improved. The gas barrier layer can be formed by laminating a film made of the above-mentioned gas barrier resin via an adhesive layer.

[0122] (Metal foil) The laminate 20 of the present invention may include a metal foil, which can further improve the oxygen barrier property and water vapor barrier property. The metal constituting the metal foil is not particularly limited, and metal foils made of aluminum, magnesium, etc. can be used. The thickness of the metal foil is preferably 3 μm or more and 100 μm or less, and more preferably 6 μm or more and 25 μm or less. By making the thickness of the metal foil 3 μm or more, the oxygen barrier property and water vapor barrier property of the laminate 20 of the present invention can be further improved. The metal foil can be laminated via an adhesive layer.

[0123] (An example of layer structure) An example of the layer structure of the laminate is shown below. In the following example, the left side means the outside and the right side means the inside. In the following example, the symbol " / " means the boundary between each layer. In the following example, "substrate" means the base layer, "adhesive" means the adhesive resin layer, "Ad" means the adhesive layer, "AC" means the anchor coat layer, "vapor deposition" means the vapor deposition film, "foil" means the metal foil, "hi" means the heat seal layer, "adhesive" means the adhesive layer, "ho" means the hot melt layer, "coat" means the gas barrier coating film, "support" means the support layer, and "print" means the printing layer. In the following example, "CR-PEs" means polyester film 11, "PET" means polyethylene terephthalate, "ONY" means oriented nylon, "OPP" means oriented polypropylene, "CPP" means unoriented polypropylene, "PVC" means polyvinyl chloride, "PE" means polyethylene, "PEF" means polyethylene film, "Al" means aluminum, "MO" means metal oxide, and "MOR" means metal alkoxide.

[0124] The two-layer laminate may have, for example, the following structure. (1) Group (CR-PEs) / Ad / H(PEF) (2) Group (CR-PEs) / H(PE) (3) Group (CR-PEs) / AC / H(PE) (4) Base (CR-PEs) / AC / Adhesive (PE) / Arginine (PEF) Base (CR-PEs) / Adhesive (Adhesive) (5) Base (CR-PEs) / Modified (MO) / Coated (MOR) / Ad / Phenyl (PEF) (6) Base (CR-PEs) / Steam (MO) / Coating (MOR) / PVC (PE) (7) Base (CR-PEs) / Steamed (MO) / Painted (MOR) / AC / Hi (PE) (8) Group (CR-PEs) / Steamed (MO) / Painted (MOR) / AC / Contacted (PE) / Hi (PEF) (9) Base (CR-PEs) / Vapor (Al) / Adhesive (Adhesive) (10) Group(CR-PEs) / Al(Al) / Al(PE) (11) Group(CR-PEs) / Al(Al) / AC / PE(PE)

[0125] The two-layer laminate including the printed layer may have, for example, the following structure. (1) Group (CR-PEs) / Indium / Ad / He(PEF) (2) Group (CR-PEs) / mark / hi (PE) (3) Group (CR-PEs) / Ind / AC / Hi(PE) (4) Group (CR-PEs) / mark / AC / contact (PE) / hi (PEF) (5) Group (CR-PEs) / Printing / Adhesive (Adhesive) (6) Printing / Base (CR-PEs) / Steam (Al) / Adhesive (Adhesive) (7)Mark / Group(CR-PEs) / Al(Al) / Hi(PE) (8)Mark / Group(CR-PEs) / Al(Al) / AC / (PE)

[0126] Examples of the laminate having three or more layers include the following structures: In the following structure, the base layer is a polyester film 11. (1) Base (CR-PEs) / Al / foil (Al) / Al / support (ONY) / Al / Hg (PEF) (2) Base (CR-PEs) / Al / foil (Al) / Al / Pb (CPP) (3) Group (CR-PEs) / Ad / vaporization (Al) / support (PET) / Ad / hi (PEF) (4) CR-PEs / Ad / ONY / Ad / PEF (5) Base (CR-PEs) / Ad / Coated (MOR) / Steamed (MO) / Supported (PET) / Ad / Hi (CPP) (6) Group (CR-PEs) / Ad / vaporization (Al) / support (PET) / Ad / hi (CPP) (7) Base (CR-PEs) / Al / Support (ONY) / Al / Foil (Al) / Al / Pb (CPP) (8) Group (CR-PEs) / AC / Contact (PE) / Foil (Al) / Al (PE) (9) Group (CR-PEs) / AC / Contact (PE) / Foil (Al) / AC / Hi (PE) (10) Group (CR-PEs) / AC / Contact (PE) / Evaporation (Al) / Support (PET) / AC / Contact (PE) / Heat (PEF) (11) Group (CR-PEs) / AC / Contact (PE) / Foil (Al) / AC / Contact (PE) / Hi (PEF) (12) Base (CR-PEs) / Ad / Support (PET) / Ad / He (PEF) / He (Hot melt adhesive) (13) Base (CR-PEs) / Steamed (MO) / Painted (MOR) / Ad / Supported (ONY) / Ad / Hi (CPP) (14) Base (CR-PEs) / Steam (MO) / Coating (MOR) / Ad / Support (ONY) / Ad / Hydrogen (PEF) (15) Base (CR-PEs) / Steamed (MO) / Painted (MOR) / Ad / Painted (MOR) / Steamed (MO) / Supported (PET) / Ad / Hi (CPP) (16) Base (CR-PEs) / Steamed (MO) / Painted (MOR) / Ad / Steamed (Al) / Supported (PET) / Ad / Hi (CPP) (17) Base (CR-PEs) / Steam (MO) / Coating (MOR) / Al / Support (ONY) / Al / Foil (Al) / Al / Pb (CPP) (18) Base (CR-PEs) / Steam (MO) / Coating (MOR) / Ad / Support (PET) / Ad / PEF / Hot melt adhesive (19) PEF / Al / base (CR-PEs) / Al / foil (Al) / Al / PEF (20) PEF / Ad / MOR / MO / CR-PEs / Ad / PEF (21) Al (PE) / base (CR-PEs) / Al / support (PEF) / Al / foil (Al) / Al (PEF) (22) PEG / Ad / base (CR-PEs) / Ad / support (PEF) / Ad / support (PET) / steamed (MO) / coated (MOR) / Ad / PEG (PEF) (23) PEG / Ad / base (CR-PEs) / Ad / support (PEF) / Ad / coated (MOR) / steamed (MO) / support (PET) / Ad / PEG (PEF)

[0127] Examples of the laminate having three or more layers and a printed layer include the following structure: In the following structure, the base layer is a polyester film 11. (1) Base (CR-PEs) / Insulation / Al / Foil (Al) / Al / Support (ONY) / Al / H (PEF) (2) Base (CR-PEs) / Insulation / Al / Foil (Al) / Al / Ph (CPP) (3) Group (CR-PEs) / Mark / Ad / Steam (Al) / Support (PET) / Ad / Hi (PEF) (4) CR-PEs / India / Ad / China / ONY / Ad / Humanities / PEF (5) Base (CR-PEs) / Mark / Ad / Coating (MOR) / Steaming (MO) / Support (PET) / Ad / Hi (CPP) (6) Group (CR-PEs) / Mark / Ad / Evaporation (Al) / Support (PET) / Ad / Hi (CPP) (7) Base (CR-PEs) / Indium / Al / Support (ONY) / Al / Foil (Al) / Al / Aluminum (CPP) (8) Base (CR-PEs) / Insulation / AC / Glue (PE) / Foil (Al) / Plastic (PE) (9) Base (CR-PEs) / Insulation / AC / Bond (PE) / Foil (Al) / AC / Al (PE) (10) Group (CR-PEs) / Mark / AC / Contact (PE) / Evaporation (Al) / Support (PET) / AC / Contact (PE) / Hi (PEF) (11) Group (CR-PEs) / Mark / AC / Contact (PE) / Foil (Al) / AC / Contact (PE) / Hi (PEF) (12) CR-PEs / Ind / Ad / PET / Ad / PEF / Hot melt adhesive (13) PEF / Al / base (CR-PEs) / Al / Al foil (Al) / Al / PEF (14) PEF / Ad / MOR / MO / CR-PEs / Ad / PEF (15) PE / CR-PEs / Al / PEF / Al / Al foil / PEF (16) PEF / Ad / CR-PEs / Indium / Ad / PEF / Ad / PET / MOR / Ad / PEF (17) PEF / Ad / CR-PEs / Ad / Support (PEF) / Ad / MOR / MO / Support (PET) / Ad / PEF

[0128] Examples of the laminate having three or more layers include the following structure: In the following structure, the support layer of the intermediate layer is a polyester film 11. (1) Base (paper) / Al / Foil (Al) / Al / Support (CR-PEs) / Al / PVC (2) Base (ONY) / Al / Support (CR-PEs) / Al / Foil (Al) / Al / Phenyl (PEF) (3) Base (PET) / Steamed (MO) / Painted (MOR) / Ad / Support (CR-PEs) / Ad / Hi (PEF) (4) Paper / Ad / Support (CR-PEs) / Ad / H (CPP) (5) OPP / Ad / CR-PEs / Ad / CPP (6) ONY / Ad / CR-PEs / Ad / CPP (7) Base (PET) / Ad / Support (CR-PEs) / Ad / Hi (PEF) / Hot melt adhesive (8) OPP / Ad / CR-PEs / Ad / PEF (9) Base (PET) / Steamed (MO) / Painted (MOR) / Ad / Support (CR-PEs) / Ad / Hi (CPP) (10) Aluminum (PE) / Base (paper) / Adhesive (PE) / AC / Foil (Al) / Aluminum / Support (CR-PEs) / AC / Adhesive (PE) / Aluminum (PEF) (11) Base (paper) / Adhesive (PE) / Support (CR-PEs) / Top layer (PE) (12) Base (paper) / Adhesive (PE) / Support (CR-PEs) / AC / Top layer (PE) (13) Base (OPP) / Adhesive (Ad) / Support (CR-PEs) / Adhesive (Ad) / Top layer (OPP) (14) Base (PET) / Adhesive (Ad) / Vapor deposition (Al) / Support (CR-PEs) / Adhesive (Ad) / Top layer (PEF) (15) Base (ONY) / AC / Adhesive (PE) / Vapor deposition (Al) / Support (CR-PEs) / AC / Adhesive (PE) / Top layer (PEF) (16) Base (paper) / Adhesive (Ad) / Coating (MOR) / Vapor deposition (MO) / Support (CR-PEs) / Adhesive (Ad) / Top layer (CPP) (17) Base (OPP) / Adhesive (Ad) / Coating (MOR) / Vapor deposition (MO) / Support (CR-PEs) / Adhesive (Ad) / Top layer (CPP) (18) Base (PET) / Vapor deposition (MO) / Coating (MOR) / Adhesive (Ad) / Coating (MOR) / Vapor deposition (MO) / Support (CR-PEs) / Adhesive (Ad) / Top layer (PEF) (19) Base (ONY) / Adhesive (Ad) / Coating (MOR) / Vapor deposition (MO) / Support (CR-PEs) / Adhesive (Ad) / Top layer (CPP) (20) Base (PET) / Adhesive (Ad) / Coating (MOR) / Vapor deposition (MO) / Support (CR-PEs) / Adhesive (Ad) / Top layer (PEF) / Hot melt adhesive (Hot melt adhesive) (21) Base (OPP) / Adhesive (Ad) / Coating (MOR) / Vapor deposition (MO) / Support (CR-PEs) / Adhesive (Ad) / Top layer (PEF) (22) Base (PET) / Adhesive (Ad) / Coating (MOR) / Vapor deposition (MO) / Support (CR-PEs) / Adhesive (Ad) / Top layer (CPP) (23) Base (paper) / Adhesive (PE) / Coating (MOR) / Vapor deposition (MO) / Support (CR-PEs) / AC / Top layer (PE) (24) Base (OPP) / Adhesive (Ad) / Coating (MOR) / Vapor deposition (MO) / Support (CR-PEs) / Adhesive (Ad) / Top layer (OPP) (25) Base (PET) / Adhesive (Ad) / Support (CR-PEs) / Top layer (PE) (26) Base (PET) / Adhesive (Ad) / Support (CR-PEs) / AC / Top layer (PE) (27) Top layer (PE) / Base (paper) / Adhesive (PE) / Support (CR-PEs) / Adhesive (Ad) / Top layer (PEF) (28) Top layer (PE) / Base (paper) / Adhesive (PE) / Support (CR-PEs) / Top layer (PE) (29) PE / Base (Paper) / Attachment (PE) / Support (CR-PEs) / AC / PE

[0129] Examples of the laminate having three or more layers and a printed layer include the following structure: In the following structure, the support layer of the intermediate layer is a polyester film 11. (1) Print / Base (paper) / Ad / Foil (Al) / Ad / Support (CR-PEs) / Ad / PVC (2) Base (ONY) / Insulation / Al / Support (CR-PEs) / Al / Foil (Al) / Al / PEF (3) Seal / base (paper) / Ad / support (CR-PEs) / Ad / hi (CPP) (4) Japan (OPP) / India / Ad / China (CR-PEs) / Ad / China (CPP) (5) Base (ONY) / Ad / Support (CR-PEs) / Ad / Hi (CPP) (6) PET / Ad / CR-PEs / Ad / PEF / Hot melt adhesive (7) OPP / India / Ad / China (CR-PEs) / Ad / Human (PEF) (8) PE / print / base (paper) / bond (PE) / AC / foil (Al) / Al / support (CR-PEs) / AC / bond (PE) / PEF (9) Seal / Base (Paper) / Connection (PE) / Support (CR-PEs) / Hi (PE) (10) Seal / Base (Paper) / Connection (PE) / Support (CR-PEs) / AC / Hi (PE) (11) OPP / Ad / CR-PEs / Ind / Ad / H(OPP) (12) Base (PET) / Mark / Ad / Evaporation (Al) / Support (CR-PEs) / Ad / Hi (PEF) (13) Base (ONY) / mark / AC / contact (PE) / vaporization (Al) / support (CR-PEs) / AC / contact (PE) / Hi (PEF) (14) Seal / Base (Paper) / Ad / Coated (MOR) / Steamed (MO) / Support (CR-PEs) / Ad / Hi (CPP) (15) Base (OPP) / Mark / Ad / Coating (MOR) / Steaming (MO) / Support (CR-PEs) / Ad / Hi (CPP) (16) Base (ONY) / Ad / Painted (MOR) / Steamed (MO) / Supported (CR-PEs) / Ad / Hi (CPP) (17) Base (PET) / Printing / Ad / Coating (MOR) / Steam (MO) / Support (CR-PEs) / Ad / H (PEF) / H (Hot melt adhesive) (18) OPP / Ink / Ad / MOR / Steam / CR-PEs / Ad / PEF (19) Base (PET) / Mark / Ad / Coat (MOR) / Map (MO) / Support (CR-PEs) / Ad / Hi (CPP) (20) Printing / Base (Paper) / Adhesive (PE) / Coating (MOR) / Steaming (MO) / Support (CR-PEs) / Heat (PE) (21) Seal / Base (Paper) / Contact (PE) / Coating (MOR) / Steaming (MO) / Support (CR-PEs) / AC / Hi (PE) (22) Base (OPP) / Printing / Ad / Coating (MOR) / Steam (MO) / Support (CR-PEs) / Ad / Hi (OPP) (23) Group(PET) / Ad / Mark / Support(CR-PEs) / Hi(PE) (24) Base (PET) / Ad / Support (CR-PEs) / Hi (PE) (25) Group(PET) / Ad / Mark / Support(CR-PEs) / AC / Hi(PE) (26) Base (PET) / Ad / Support (CR-PEs) / AC / Hi (PE) (27) HI(PE) / Seal / Base(Paper) / Connection(PE) / Support(CR-PEs) / Ad / HI(PEF) (28) Hi(PE) / Seal / Base(Paper) / Connection(PE) / Support(CR-PEs) / Hi(PE) (29) Hi(PE) / Seal / Base(Paper) / Connection(PE) / Support(CR-PEs) / AC / Hi(PE)

[0130] In the laminate having three or more layers, both the base layer and the intermediate support layer may be made of the polyester film 11 .

[0131] (packaging container) According to the laminate 20 of the present invention, it is possible to produce a packaging container that reduces the environmental load and has high hygienic properties. Examples of packaging containers include packaging bags (pouches), lids, laminated tubes, paper containers, paper cups, and label materials. The contents filled in the packaging container are not particularly limited, and may be liquid, powder, or gel. In addition, the contents may be food or non-food.

[0132] (Pouch) Examples of packaging bags include standing pouches, pillow bags (palm-sealed bags), two-sided sealed bags, three-sided sealed bags, four-sided sealed bags, side sealed bags, envelope-sealed bags, pleated sealed bags, flat-bottom sealed bags, square-bottom sealed bags, and gusseted bags.

[0133] Fig. 9 is a diagram simply illustrating an example of the configuration of a standing pouch 30. As shown in Fig. 9, the standing pouch 30 includes a body portion 31 and a bottom portion 32. The hatched portions indicate heat-sealed portions (the same applies to the following figures). The body 31 of the standing pouch 30 is composed of the laminate 20. The bottom 32 of the standing pouch 30 may be composed of the laminate 20 or may be composed of a different material.

[0134] In one embodiment, the laminate 20 constituting the body 31 of the standing pouch 30 comprises, from the outside to the inside, a polyester film 11 (substrate layer 25), a printed layer 12, an adhesive layer, a metal foil, an adhesive layer, a stretched resin film (support layer), an adhesive layer, and a sealant layer 21 which is an unstretched resin film made of polyethylene, polypropylene, or the like. In one embodiment, the laminate 20 constituting the body 31 of the standing pouch 30 comprises, from the outside to the inside, a polyester film 11 (substrate layer 25), a printed layer 12, an adhesive layer, a metal foil, an adhesive layer, and a sealant layer 21 which is an unstretched resin film made of polyethylene, polypropylene, or the like. The polyester film 11 included in the laminate 20 may have the first polyester layer 13 on the inside or the outside. The bottom 32 of the standing pouch 30 may also be made of the laminate 20 having the above-mentioned configuration. The laminate 20 constituting the standing pouch 30 is merely an example and is not limited thereto.

[0135] In one embodiment, the laminate 20 constituting the body 31 of the standing pouch 30 comprises, from the outside to the inside, a polyester film 11 (substrate layer 25), an adhesive layer, a metal foil, an adhesive layer, a stretched resin film (support layer), an adhesive layer, and a sealant layer 21 which is an unstretched resin film made of polyethylene, polypropylene, or the like. In one embodiment, the laminate 20 constituting the body 31 of the standing pouch 30 comprises, from the outside to the inside, a polyester film 11 (substrate layer 25), an adhesive layer, a metal foil, an adhesive layer, and a sealant layer 21 which is an unstretched resin film made of polyethylene, polypropylene, or the like. The polyester film 11 included in the laminate 20 may have the first polyester layer 13 on the inside or the outside. The bottom 32 of the standing pouch 30 may also be made of the laminate 20 having the above-mentioned configuration. The laminate 20 constituting the standing pouch 30 is merely an example and is not limited thereto.

[0136] In one embodiment, the body 31 of the standing pouch 30 can be formed by bagging the laminate 20 of the present invention so that the sealant layer 21 is on the inside.

[0137] In one embodiment, the bottom 32 of the standing pouch 30 can be formed by inserting the laminate 20 of the present invention between the side sheets of a bag and heat sealing it. More specifically, the laminate 20 can be folded in a V shape so that the sealant layer 21 is on the outside, and inserted between the body parts 31 of a bag and heat sealing it.

[0138] The heat sealing can be performed by any known method, such as bar sealing, rotary roll sealing, belt sealing, impulse sealing, high frequency sealing, ultrasonic sealing, etc.

[0139] FIG. 10 is a front schematic view showing an example of a pillow bag 40, which is one embodiment of a packaging bag, and can be produced by forming the laminate 20 into a bag so that the sealant layer 21 is the innermost layer, and then heat-sealing two opposing sides.

[0140] In one embodiment, the laminate 20 constituting the pillow bag 40 comprises, from the outside to the inside, a polyester film 11 (substrate layer 25), a printed layer 12, an adhesive layer, and a sealant layer 21 which is an unstretched resin film made of polyethylene, polypropylene, or the like. In one embodiment, the laminate 20 constituting the pillow bag 40 comprises, from the outside to the inside, a polyester film 11 (substrate layer 25), a printed layer 12, an adhesive layer, metal foil, and a sealant layer 21 formed by melt extruding polyethylene, polypropylene, or the like. In one embodiment, the laminate 20 constituting the pillow bag 40 comprises, from the outside to the inside, a polyester film 11 (substrate layer 25), a printed layer 12, an adhesive layer, a metal foil, an adhesive layer, and a sealant layer 21 formed by melt extruding polyethylene, polypropylene, or the like. In one embodiment, the laminate 20 constituting the pillow bag 40 comprises, from the outside to the inside, a polyester film 11 (substrate layer 25), a printed layer 12, an adhesive layer, a metal foil, an adhesive layer, and a sealant layer 21 which is an unstretched resin film made of polyethylene, polypropylene, or the like. The polyester film 11 included in the laminate 20 may have the first polyester layer 13 on the inside or the outside. The above-described laminate 20 constituting the pillow bag 40 is merely an example, and is not limited thereto.

[0141] In one embodiment, the laminate 20 constituting the pillow bag 40 comprises, from the outside to the inside, a polyester film 11 (substrate layer 25), an adhesive layer, and a sealant layer 21 which is an unstretched resin film made of polyethylene, polypropylene, or the like. In one embodiment, the laminate 20 constituting the pillow bag 40 comprises, from the outside to the inside, a polyester film 11 (substrate layer 25), an adhesive layer, metal foil, and a sealant layer 21 formed by melt extrusion of polyethylene, polypropylene, or the like. In one embodiment, the laminate 20 constituting the pillow bag 40 comprises, from the outside to the inside, a polyester film 11 (substrate layer 25), an adhesive layer, metal foil, an adhesive layer, and a sealant layer 21 formed by melt extrusion of polyethylene, polypropylene, or the like. In one embodiment, the laminate 20 constituting the pillow bag 40 comprises, from the outside to the inside, a polyester film 11 (substrate layer 25), an adhesive layer, a metal foil, an adhesive layer, and a sealant layer 21 which is an unstretched resin film made of polyethylene, polypropylene, or the like. The polyester film 11 included in the laminate 20 may have the first polyester layer 13 on the inside or the outside. The above-described laminate 20 constituting the pillow bag 40 is merely an example, and is not limited thereto.

[0142] FIG. 11 is a schematic front view showing an example of a three-sided sealed bag 50, which can be produced by overlapping two laminates 20 with their sealant layers 21 facing each other, and heat-sealing the three sides. FIG. 12 is a schematic front view showing an example of the four-side seal type bag 60, which can be manufactured by overlapping two laminates 20 so that the sealant layers 21 face each other and heat-sealing the four sides.

[0143] In one embodiment, the laminate 20 constituting the three-side seal type bag 50 or the four-side seal type bag 60 includes, from the outside to the inside, a polyester film 11 (base material layer 25), a printing layer 12, an adhesive layer, a metal foil, and a sealant layer 21 formed by melt-extruding polyethylene, polypropylene, or the like. In one embodiment, the laminate 20 constituting the three-side seal type bag 50 or the four-side seal type bag 60 includes, from the outside to the inside, a polyester film 11 (base material layer 25), a printing layer 12, an adhesive layer, a metal foil, an adhesive layer, and a sealant layer 21 formed by melt-extruding polyethylene, polypropylene, or the like. In one embodiment, the laminate 20 constituting the three-side seal type bag 50 or the four-side seal type bag 60 includes, from the outside to the inside, a polyester film 11 (base material layer 25), a printing layer 12, an adhesive layer, a vapor deposition film, a polyester film (support layer), an adhesive layer, and a sealant layer 21 which is an unstretched resin film made of polyethylene, polypropylene, or the like. The "polyester film" may have the same configuration as the "polyester film 11" or a different configuration. The same applies to the following configurations. In one embodiment, the laminate 20 constituting the three-side seal type bag 50 or the four-side seal type bag 60 includes, from the outside to the inside, a polyester film 11 (base material layer 25), a printing layer 12, an adhesive layer, a metal foil, an adhesive layer, and a sealant layer 21 which is an unstretched resin film made of polyethylene, polypropylene, or the like. The polyester film 11 included in the laminate 20 may have the first polyester layer 13 on the inside or on the outside. The above laminate 20 constituting the three-side seal type bag 50 or the four-side seal type bag 60 is merely an example and is not limited thereto.

[0144] In one embodiment, the laminate 20 constituting the three-sided sealed bag 50 or the four-sided sealed bag 60 comprises, from the outside to the inside, a polyester film 11 (substrate layer 25), an adhesive layer, a metal foil, and a sealant layer 21 formed by melt extruding polyethylene, polypropylene, or the like. In one embodiment, the laminate 20 constituting the three-sided sealed bag 50 or the four-sided sealed bag 60 comprises, from the outside to the inside, a polyester film 11 (substrate layer 25), an adhesive layer, metal foil, an adhesive layer, and a sealant layer 21 formed by melt extruding polyethylene, polypropylene, or the like. In one embodiment, the laminate 20 constituting the three-sided sealed bag 50 or the four-sided sealed bag 60 comprises, from the outside to the inside, a polyester film 11 (base material layer 25), an adhesive layer, a vapor deposition film, a polyester film (support layer), an adhesive layer, and a sealant layer 21 which is an unstretched resin film made of polyethylene, polypropylene, or the like. In one embodiment, the laminate 20 constituting the three-sided sealed bag 50 or the four-sided sealed bag 60 comprises, from the outside to the inside, a polyester film 11 (substrate layer 25), an adhesive layer, a metal foil, an adhesive layer, and a sealant layer 21 which is an unstretched resin film made of polyethylene, polypropylene, or the like. The polyester film 11 included in the laminate 20 may have the first polyester layer 13 on the inside or the outside. The above-described laminate 20 constituting the three-side sealed bag 50 or the four-side sealed bag 60 is merely an example, and is not limited thereto.

[0145] (Lid material 70) The laminate 20 of the present invention can be used for a lid material 70 shown in FIG. As shown in FIG. 13, the laminate 20 of the present invention is heat-sealed to a container body 71 with the sealant layer 21 facing inside. The shape of the container body 71 may be a cup shape or a cylindrical shape with a bottom as shown in FIG. 13, but is not limited to this.

[0146] In one embodiment, the laminate 20 constituting the lid material 70 comprises, from the outside to the inside, a polyester film (substrate layer 25), an adhesive layer, a printing layer 12, a polyester film 11 (support layer), and a sealant layer 21 formed by melt extruding polyethylene, polypropylene, or the like. In one embodiment, the laminate 20 constituting the lid material 70 comprises, from the outside to the inside, a polyester film (substrate layer 25), a printing layer 12, an adhesive layer, a polyester film 11 (support layer), and a sealant layer 21 formed by melt extruding polyethylene, polypropylene, or the like. In one embodiment, the laminate 20 constituting the lid material 70 comprises, from the outside to the inside, a polyester film (substrate layer 25), an adhesive layer, a printing layer 12, a polyester film 11 (support layer), an adhesive layer, and a sealant layer 21 formed by melt extruding polyethylene, polypropylene, or the like. In one embodiment, the laminate 20 constituting the lid material 70 comprises, from the outside to the inside, a polyester film (base material layer 25), a printing layer 12, an adhesive layer, a polyester film 11 (support layer), an adhesive layer, and a sealant layer 21 formed by melt extruding polyethylene, polypropylene, or the like. In one embodiment, the laminate 20 constituting the lid material 70 comprises, from the outside to the inside, a polyester film 11 (substrate layer 25), a printing layer 12, an adhesive layer, and a sealant layer 21 which is an unstretched resin film made of polyethylene, polypropylene, or the like. The polyester film 11 included in the laminate 20 may have the first polyester layer 13 on the inside or the outside. The laminate 20 constituting the lid member 70 is merely an example, and is not limited thereto.

[0147] In one embodiment, the laminate 20 constituting the lid material 70 comprises, from the outside to the inside, a polyester film (base layer 25), an adhesive layer, a polyester film 11 (support layer), and a sealant layer 21 formed by melt extrusion of polyethylene, polypropylene, or the like. In one embodiment, the laminate 20 constituting the lid material 70 comprises, from the outside to the inside, a polyester film (base layer 25), an adhesive layer, a polyester film 11 (support layer), an adhesive layer, and a sealant layer 21 formed by melt extruding polyethylene, polypropylene, or the like. In one embodiment, the laminate 20 constituting the lid material 70 comprises, from the outside to the inside, a polyester film 11 (substrate layer 25), an adhesive layer, and a sealant layer 21 which is an unstretched resin film made of polyethylene, polypropylene, or the like. The polyester film 11 included in the laminate 20 may have the first polyester layer 13 on the inside or the outside. The laminate 20 constituting the lid member 70 is merely an example, and is not limited thereto.

[0148] (Laminated tube 80) The laminate 20 of the present invention can be used as a material for forming a laminate tube 80 . Fig. 14 is a partial cross-sectional view showing an example of a laminate tube 80. As shown in Fig. 14, the laminate tube 80 includes a head portion 81 and a cylindrical body portion 82 formed of the laminate 20 of the present invention.

[0149] As shown in FIG. 14, the head portion 81 includes a spout portion 83 and a shoulder portion 84 . The tubular body 82 is connected to a shoulder 84 of the head 81 .

[0150] In one embodiment, the laminate 20 that constitutes the cylindrical body 82 included in the laminate tube 80 includes, from the outside toward the inside, a second sealant layer 23 formed by melt-extruding polyethylene, polypropylene, or the like, a polyester film 11 (base material layer 25), a printing layer 12, an adhesive layer, a polyethylene film (support layer), an adhesive layer, a metal foil, an adhesive layer, and a first sealant layer 22 that is an unstretched resin film made of polyethylene, polypropylene, or the like. In one embodiment, the laminate 20 that constitutes the cylindrical body 82 included in the laminate tube 80 includes, from the outside toward the inside, a second sealant layer 23 that is an unstretched resin film made of polyethylene, polypropylene, or the like, an adhesive layer, a polyester film 11 (base material layer 25), a printing layer 12, an adhesive layer, a metal foil, an adhesive layer, and a first sealant layer 22 that is an unstretched resin film made of polyethylene, polypropylene, or the like. In one embodiment, the laminate 20 that constitutes the cylindrical body 82 included in the laminate tube 80 includes, from the outside toward the inside, a second sealant layer 23 that is an unstretched resin film made of polyethylene, polypropylene, or the like, an adhesive layer, a polyester film 11 (base material layer 25), a printing layer 12, an adhesive layer, a polyethylene film (support layer), an adhesive layer, a polyester film (support layer), a vapor deposition film, a gas barrier coating film, an adhesive layer, and a first sealant layer 22 that is an unstretched resin film made of polyethylene, polypropylene, or the like. In one embodiment, the laminate 20 that constitutes the cylindrical body 82 included in the laminate tube 80 includes, from the outside toward the inside, a second sealant layer 23 that is an unstretched resin film made of polyethylene, polypropylene, or the like, an adhesive layer, a polyester film 11 (base material layer 25), a printing layer 12, an adhesive layer, a polyethylene film (support layer), an adhesive layer, a gas barrier coating film, a vapor deposition film, a polyester film (support layer), an adhesive layer, and a first sealant layer 22 that is an unstretched resin film made of polyethylene, polypropylene, or the like. The polyester film 11 included in the laminate 20 may have the first polyester layer 13 on the inside or the outside. The laminate 20 constituting the cylindrical body 82 of the laminate tube 80 is merely an example, and is not limited thereto.

[0151] In one embodiment, the laminate 20 constituting the cylindrical body 82 of the laminated tube 80 comprises, from the outside to the inside, a second sealant layer 23 formed by melt extruding polyethylene, polypropylene, or the like, a polyester film 11 (substrate layer 25), an adhesive layer, a polyethylene film (support layer), an adhesive layer, a metal foil, an adhesive layer, and a first sealant layer 22 which is an unstretched resin film composed of polyethylene, polypropylene, or the like. In one embodiment, the laminate 20 constituting the cylindrical body 82 of the laminated tube 80 comprises, from the outside to the inside, a second sealant layer 23 which is an unstretched resin film made of polyethylene, polypropylene or the like, an adhesive layer, a polyester film 11 (substrate layer 25), an adhesive layer, a metal foil, an adhesive layer, and a first sealant layer 22 which is an unstretched resin film made of polyethylene, polypropylene or the like. In one embodiment, the laminate 20 constituting the cylindrical body 82 of the laminate tube 80 comprises, from the outside to the inside, a second sealant layer 23 which is an unstretched resin film made of polyethylene, polypropylene or the like, an adhesive layer, a polyester film 11 (substrate layer 25), an adhesive layer, a polyethylene film (support layer), an adhesive layer, a polyester film (support layer), a vapor deposition film, a gas barrier coating film, an adhesive layer, and a first sealant layer 22 which is an unstretched resin film made of polyethylene, polypropylene or the like. In one embodiment, the laminate 20 constituting the cylindrical body 82 of the laminate tube 80 comprises, from the outside to the inside, a second sealant layer 23 which is an unstretched resin film made of polyethylene, polypropylene or the like, an adhesive layer, a polyester film 11 (substrate layer 25), an adhesive layer, a polyethylene film (support layer), an adhesive layer, a gas barrier coating film, a vapor deposition film, a polyester film (support layer), an adhesive layer, and a first sealant layer 22 which is an unstretched resin film made of polyethylene, polypropylene or the like. The polyester film 11 included in the laminate 20 may have the first polyester layer 13 on the inside or the outside. The laminate 20 constituting the cylindrical body 82 of the laminate tube 80 is merely an example, and is not limited thereto.

[0152] In one embodiment, the cylindrical body portion 82 can be produced by overlapping the first sealant layer 22 and the second sealant layer 23 at both ends of the laminate 20 and heat-sealing the overlapped portion. However, this is not limited to this, and the first sealant layers 22 at both ends or the second sealant layers 23 at both ends may be heat-sealed to each other.

[0153] The method for producing the head 81 is not particularly limited, and the head 81 can be produced by a conventionally known method. For example, the head 81 can be produced by a compression molding method or an injection molding method, and can be joined to one open end of the cylindrical body 82. After joining the head portion 81, the other open end is filled with contents, and the open end is heat sealed to form a bottom seal portion 85, thereby obtaining a laminate tube 80. The spout portion 83 may be provided with threads for screwing the cap 86 onto it.

[0154] (Paper container 90) The laminate 20 of the present invention can be used as a material for forming a paper container 90. Figure 15 is a perspective view showing an example of the paper container 90. The paper container 90 has a body 91, a bottom 92, and an upper portion 93. FIG. 15 shows a paper container 90 having a rectangular tubular body 91, but the present invention is not limited to this.

[0155] In one embodiment, the upper portion 93 includes a pair of opposing inclined plates 94 and a pair of fold-out portions 95 positioned between and folded between the inclined plates 94 . The pair of inclined plates 94 each have a margin 96 at the upper end, and are bonded to each other. In one embodiment, one of the inclined plates 94 provided on the upper portion 93 is provided with a pouring outlet 97 and a cap 98 can be attached, but this is not limited to this and the configuration may not include the pouring outlet 97.

[0156] In one embodiment, the laminate 20 constituting the paper container 90 comprises, from the outside to the inside, a second sealant layer 23 formed by melt extruding polyethylene, polypropylene, or the like, a printed layer 12, a paper base material, an adhesive layer, a polyester film 11 (support layer), an adhesive layer, and a first sealant layer 22 which is an unstretched resin film composed of polyethylene, polypropylene, or the like. The polyester film 11 included in the laminate 20 may have the first polyester layer 13 on the inside or the outside. The laminate 20 constituting the cylindrical body 82 of the paper container 90 is merely an example, and is not limited to this.

[0157] In one embodiment, the laminate 20 constituting the paper container 90 comprises, from the outside to the inside, a second sealant layer 23 formed by melt extruding polyethylene, polypropylene, or the like, a paper base material, an adhesive layer, a polyester film 11 (support layer), an adhesive layer, and a first sealant layer 22 which is an unstretched resin film composed of polyethylene, polypropylene, or the like. The polyester film 11 included in the laminate 20 may have the first polyester layer 13 on the inside or the outside. The laminate 20 that constitutes the cylindrical body portion 82 provided in the paper container 90 is merely an example and is not limited thereto.

[0158] The paper container 90 can be manufactured by a conventionally known method of manufacturing a box. Further, the shape of the paper container is not limited to the gable-top type shown in FIG. 16, and can be appropriately changed according to the contents to be filled, such as the brick type.

[0159] (Paper cup 100) The laminate 20 of the present invention can be used as a material for constituting the paper cup 100. FIG. 16 is a perspective view showing an example of a paper cup 100 with a part cut away. As shown in FIG. 16, the paper cup 100 includes a body portion 101 and a bottom portion 102. Although FIG. 16 shows a cylindrical body portion 101 that gradually widens toward the opening, it is not limited thereto. In one embodiment, as shown in FIG. 16, the body portion 101 includes a flange portion 103 with the opening end rounded outward. In one embodiment, the paper cup 100 may include a lid material that adheres along the flange portion 103 (not shown).

[0160] In one embodiment, the laminate 20 that constitutes the paper cup 100 includes, from the outside toward the inside, a printing layer 12, a paper base material, an adhesive layer, a polyester film 11 (support layer), and a sealant layer 21 formed by melt-extruding polyethylene, polypropylene, or the like. In one embodiment, the laminate 20 that constitutes the paper cup 100 includes, from the outside toward the inside, a printing layer 12, a paper base material, an adhesive layer, a polyester film 11 (support layer), an adhesive layer, and a sealant layer 21 formed by melt-extruding polyethylene, polypropylene, or the like. In one embodiment, the laminate 20 constituting the paper cup 100 comprises, from the outside to the inside, a second sealant layer 23 formed by melt-extruding polyethylene, polypropylene, or the like, a printed layer 12, a paper base material, an adhesive layer, a polyester film 11 (support layer), and a first sealant layer 22 formed by melt-extruding polyethylene, polypropylene, or the like. In one embodiment, the laminate 20 constituting the paper cup 100 comprises, from the outside to the inside, a second sealant layer 23 formed by melt-extruding polyethylene, polypropylene, or the like, a printed layer 12, a paper base material, an adhesive layer, a polyester film 11 (support layer), an adhesive layer, and a first sealant layer 22 formed by melt-extruding polyethylene, polypropylene, or the like. The polyester film 11 included in the laminate 20 may have the first polyester layer 13 on the inside or the outside. The laminate 20 constituting the paper cup 100 is merely an example and is not limited to this.

[0161] In one embodiment, the laminate 20 constituting the paper cup 100 comprises, from the outside to the inside, a paper base material, an adhesive layer, a polyester film 11 (support layer), and a sealant layer 21 formed by melt extruding polyethylene, polypropylene, or the like. In one embodiment, the laminate 20 constituting the paper cup 100 comprises, from the outside to the inside, a paper base material, an adhesive layer, a polyester film 11 (support layer), an adhesive layer, and a sealant layer 21 formed by melt extruding polyethylene, polypropylene, or the like. In one embodiment, the laminate 20 constituting the paper cup 100 comprises, from the outside to the inside, a second sealant layer 23 formed by melt-extruding polyethylene, polypropylene, or the like, a paper base material, an adhesive layer, a polyester film 11 (support layer), and a first sealant layer 22 formed by melt-extruding polyethylene, polypropylene, or the like. In one embodiment, the laminate 20 constituting the paper cup 100 comprises, from the outside to the inside, a second sealant layer 23 formed by melt-extruding polyethylene, polypropylene, or the like, a paper base material, an adhesive layer, a polyester film 11 (support layer), an adhesive layer, and a first sealant layer 22 formed by melt-extruding polyethylene, polypropylene, or the like. The polyester film 11 included in the laminate 20 may have the first polyester layer 13 on the inside or the outside. The laminate 20 constituting the paper cup 100 is merely an example and is not limited to this.

[0162] An example of a method for manufacturing the paper cup 100 will now be described with reference to FIG. First, the laminate 20 of the present invention is cut out to produce a sector-shaped body blank 101', as shown in Fig. 17. Next, this body blank 101' is rolled into a cylindrical shape, and both ends 101'a are overlapped and heat-sealed in multiple states to form the body attachment portion 104. Next, the laminate 20 of the present invention is cut out to produce a circular bottom blank 102', and then the outer periphery of this blank is bent downward to form a bent portion 102'a. Next, the bent portion 102'a of the bottom blank 102' is fitted over the lower end of the body blank 101'a so as to be wrapped around it, and then heat-sealed, thereby obtaining the paper cup 100. If desired, the open end of the body may be rolled outwardly to form a flange 103 . EXAMPLES

[0163] Next, the present invention will be described in detail with reference to examples. However, the present invention is not limited to the description of the following examples as long as it does not depart from the gist of the present invention.

[0164] (Example 1-1) Chemically recycled polyethylene terephthalate and a blend resin of chemically recycled polyester and fossil fuel polyethylene terephthalate were co-extruded and then biaxially stretched to produce a polyester film 11 having a first polyester layer 13 made of chemically recycled polyester and having a thickness of 3 μm, a second polyester layer 14 made of the blend resin and having a thickness of 6 μm, and a third polyester layer 15 made of chemically recycled polyester and having a thickness of 3 μm.

[0165] A printed layer 12 was formed on the surface of the third polyester layer 15 of this polyester film 11 by gravure printing, to obtain a printed resin film 10 of the present invention.

[0166] (Comparative Example 1-1) Fossil fuel polyethylene terephthalate was extruded by the T-die method, and then biaxially stretched to produce a polyester film with a thickness of 12 μm.

[0167] A printed layer was formed on one surface of this polyester film by gravure printing to obtain a printed resin film.

[0168] <<Measurement of the composition ratio of low molecular weight components>> The polyester films obtained in the above Examples and Comparative Examples were prepared, and 10 g of each was cut out and weighed in a 30 mL vial. A HFIP / chloroform mixture was added to the vial, and the mixture was allowed to stand for 12 hours to dissolve. After standing, chloroform was added to dilute the solution to prepare a 0.1% solution. This solution was filtered using a 0.45 μm hydrophilic PTFE membrane filter cartridge (Millex-LH, manufactured by Merck Millipore), and the obtained filtrate was subjected to GPC measurement under the following conditions. In the obtained molecular weight distribution curve, the area ratio of the region of molecular weight of 1,000 or less was determined. The area ratio of the region of molecular weight of 1,000 or less is shown in Table 1. Note that the molecular weight distribution curve in the region of molecular weight of 1,000 or less is shown in FIG. (Measurement conditions) Column used: Agilent Technologies, 2xPLgel 5μ MIXED (7.5mm x 300mm) Column temperature: 40℃ Mobile phase: Chloroform (Fujifilm Wako Pure Chemical Industries, Ltd., for liquid chromatography) ·Flow rate: 1.0mL / min ·Injection volume: 2.5μL Detection: 254nm (UV-Visible detector) Molecular weight calibration: Monodisperse polystyrene (Agilent Technologies, PS-1) Equipment: 515 HPLC pump, 717plus automatic injection device, UV-visible detector (Waters)

[0169] <<Cyclic trimer content measurement>> The polyester films obtained in the above Examples and Comparative Examples were prepared. Approximately 0.1 g of a sample was taken from the polyester film, and this sample was dissolved in a mixture of hexafluoroisopropanol (HFIP) and chloroform. Acetonitrile was added to this solution to precipitate the polymer, and the precipitate was then filtered. The filtrate was evaporated to dryness, and the resulting residue was dissolved in dimethylformamide (DMF). This solution was analyzed by high performance liquid chromatography (HPLC) to measure the content of cyclic trimers. The measurement results are shown in Table 1. The measurement conditions were as follows. (Measurement conditions) Equipment: Shimadzu Corporation, LC-20 Column used: Nomura Chemical Co., Ltd., Develosil ODS-HG-3 3μ (4.6×150mm) Column temperature: 40℃ Mobile phase: 0.5% acetic acid aqueous solution / acetonitrile (gradient) ·Flow rate: 1.0mL / min ·Injection volume: 15μL Detection: 254nm (UV-Visible detector) Equipment: Shimadzu Corporation, LC-20

[0170] <<Crystallization temperature and melting point measurement>> The polyester films obtained in the above Examples and Comparative Examples were prepared, and 5 mg of each film was cut out to obtain samples. The sample was heated from 20°C to 300°C at a rate of 10°C / min and held at 300°C for 5 minutes. The sample was then cooled from 300°C to 20°C at a rate of -10°C / min. The sample was then held at 20°C for 5 minutes. The sample was then heated again from 20°C to 300°C at a rate of 10°C / min. This gave a melting curve. The main peak in the temperature-lowering stage of this melting curve was taken as the crystallization temperature, and the main peak in the second temperature-up stage was taken as the melting point. The crystallization temperature and melting point are shown in Table 1.

[0171] <<Measurement of static friction coefficient>> The printed resin films obtained in the above Examples and Comparative Examples were prepared, and each printed resin film was cut to prepare a test piece of 200 mm x 150 mm. Next, this test piece was attached and fixed to the sliding table of the tester with cellophane tape so that the polyester film (the first polyester layer in Example 1-1) faced upward. Next, a test piece cut to 70 mm x 100 mm from the printed resin film was wrapped around a 63 mm x 63 mm x 6.3 mm metal thread (weight 200 g) with the printed layer on the inside and the polyester film (first polyester layer for Example 1-1) on the outside. Next, the polyester films (the first polyester layer in Example 1-1) were placed on the fixed printed resin film so that the polyester films were in contact with each other. Next, the metal thread around which the test piece was wound was slid at a speed of 100 mm / min in an environment of 23° C. and 50% relative humidity, and the friction was measured using a friction measuring device (TR-2, manufactured by Toyo Seiki Co., Ltd.). The measurement results are shown in Table 1.

[0172] <<Hygiene evaluation>> The polyester films obtained in the above Examples and Comparative Examples were prepared, and the printed resin film was cut into test pieces of 200 mm x 200 mm. Next, 80 mL of ion-exchanged water was placed in a 100 mL glass flask, and the above test piece was placed therein. The opening of the glass flask was then covered with aluminum foil, and the glass flask was placed in a water bath and heated at 80° C. for 60 minutes. After the glass flask was cooled to room temperature, three panelists checked the change in taste of the ion-exchanged water before and after the above treatment. Since the taste of ion-exchanged water changes when low molecular weight components are mixed in, the polyester film, which did not change the taste of the ion-exchanged water, can suppress the mixing of low molecular weight components into the ion-exchanged water and is therefore excellent in hygiene. Hygiene was evaluated based on the following evaluation criteria. The evaluation results are shown in Table 2. Reference Example 1-1 was performed as described above without using a test piece. <Evaluation criteria> A: None of the three people noticed any change in taste. B: Two out of three people did not notice any change in taste. NG: More than two out of three people noticed a change in taste.

[0173] [Table 1]

[0174] [Table 2]

[0175] (Example 2-1) A polyester film 11 was prepared in the same manner as in Example 1-1. A two-component curing anchor agent (A3210 / A3075 manufactured by Mitsui Chemicals, Inc.) was coated on one side of the polyester film 11 to form an anchor coat layer. Then, an aluminum foil (7 μm) was bonded to the anchor coat layer through an adhesive resin layer (15 μm) while extruding fossil fuel low density polyethylene using a sand lamination method. Then, an anchor coat layer was formed by coating the surface of the aluminum foil with a two-component curing anchor agent. Then, a heat seal layer (30 μm) was formed by melt extrusion laminating fossil fuel low density polyethylene on the anchor coat layer. This resulted in a laminate 20 in which the polyester film 11 (base layer 25), the anchor coat layer, the adhesive resin layer, the aluminum foil, the anchor coat layer, and the heat seal layer were laminated in this order.

[0176] (Example 2-2) A polyester film 11 was prepared in the same manner as in Example 1-1. The polyester film 11 and a biaxially stretched nylon film (15 μm) were bonded together by a dry lamination method using a two-component curing adhesive (manufactured by Toyo-Morton: base agent TM556 / curing agent CAT56). Separately, an aluminum foil (7 μm) and a block polypropylene film (60 μm) as a heat seal layer were attached to each other by a dry lamination method using a two-component curing adhesive. The biaxially oriented nylon film side and the aluminum foil side of these dry laminate films were bonded together by a dry lamination method using a two-component curing adhesive. This resulted in a laminate 20 in which the polyester film 11 (substrate layer 25), an adhesive layer, a biaxially oriented nylon film, an adhesive layer, an aluminum foil, an adhesive layer, and a heat seal layer were laminated in this order.

[0177] (Example 2-3) A polyester film 11 was prepared in the same manner as in Example 1-1. The polyester film 11 and a polyethylene film serving as a heat seal layer were bonded together using a two-component curing adhesive. As a result, a laminate 20 was obtained in which the polyester film 11 (base layer 25), the adhesive layer, and the heat seal layer were laminated in this order.

[0178] (Comparative Example 2-1) A fossil fuel polyester film was prepared in the same manner as in Comparative Example 1-1. A laminate was obtained in the same manner as in Example 2-1, except that this fossil fuel polyester film was used as the base layer 25.

[0179] (Comparative Example 2-2) A fossil fuel polyester film was prepared in the same manner as in Comparative Example 1-1. A laminate was obtained in the same manner as in Example 2-2, except that this fossil fuel polyester film was used as the base layer 25.

[0180] (Comparative Example 2-3) A fossil fuel polyester film was prepared in the same manner as in Comparative Example 1-1. A laminate was obtained in the same manner as in Example 2-3, except that this fossil fuel polyester film was used as the base layer 25.

[0181] <<Measurement of puncture strength>> The puncture strength was measured according to JIS Z1707 7.4 using the laminates obtained in Example 2-1 and Comparative Example 2-1. A Tensilon universal material testing machine RTC-1310 manufactured by A&D was used as the measuring device. Specifically, as shown in FIG. 19, a semicircular needle 110 having a diameter of 1.0 mm and a tip shape radius of 0.5 mm was pierced from the polyester film side of the laminate 20 in a fixed state at a speed of 50 mm / min (50 mm per minute), and the maximum value of the stress until the needle 110 penetrated the laminate 20 was measured. The maximum value of the stress was measured and used as the puncture strength of the laminate 20. The environment during the measurement was a temperature of 23°C and a relative humidity of 50%. A similar test was also performed from the heat seal layer side of the laminate 20 to measure the puncture strength. The measurement results are shown in Table 3.

[0182] <<Seal strength measurement>> The laminate obtained in Example 2-1 and Comparative Example 2-1 was cut to a length of 100 mm and a width of 15 mm to obtain a test piece 120. The test piece 120 was used to measure the seal strength. The seal strength was measured in accordance with JIS K 7127:1999 under an environment of a temperature of 25°C and a relative humidity of 50%, and a tensile tester: SA-1150 manufactured by Orientec Co., Ltd. was used as the measuring device. Specifically, first, two test pieces 120 were prepared, the sealant surfaces were placed opposite each other, and one end was heat-sealed at a temperature of 140°C and a load of 1 kg for one second to form a sealed portion 121. Next, as shown in FIG. 20, the test pieces 120 were arranged so that they were in the opposite directions to each other in a direction perpendicular to the surface direction of the sealed portion 121 of the test piece 120, that is, in a T-shape, and then the end of the non-sealed portion of one test piece 120 and the end of the non-sealed portion of the other test piece 120 were fixed to grippers 122 and 123, respectively. The chuck distance (S) was set to 50 mm, and the gripping tools 122, 123 were pulled in opposite directions perpendicular to the surface direction of the seal portion 121 of the test piece 120 at a speed of 300 mm / min, and the maximum tensile stress was measured. This maximum tensile stress was taken as the seal strength. The measurement results are shown in Table 3. The heat sealing conditions were also changed to a temperature of 160° C., and the seal strength was measured in the same manner. The measurement results are shown in Table 3.

[0183] <<Suitability for retort processing>> The laminates obtained in Example 2-2 and Comparative Example 2-2 were cut into 130 mm x 180 mm squares, and two sheets of this were prepared. The sealant layers of the laminates were placed facing each other, and the outer periphery of three sides, excluding one short side, was heat-sealed with a 10 mm wide seal bar at a temperature of 180°C and a load of 1 kg for 1 second to form a packaging bag. A test piece with a width of 15 mm and a length of 100 mm was cut from the long side, and the seal strength of the test piece before retort treatment was measured in the same manner as above. A similar packaging bag was also prepared, 150cc of water was poured into it, and the unsealed short side was heat sealed under the same conditions as above to prepare a water-filled packaging bag. This was then retorted at 121°C and 0.2 MPa for 30 minutes, after which the water was removed and a test piece 15mm wide and 100mm long was cut out from the long side, and the seal strength of the test piece after retort treatment was measured in the same manner as above. The packaging bags were also visually observed before and after the retort treatment to check for any changes in the appearance of the polyester film of the packaging bag. The results are shown in Table 4.

[0184] <<Oxygen permeability measurement>> The oxygen permeability was measured using the laminates obtained in Example 2-3 and Comparative Example 2-3. The oxygen permeability was measured in accordance with JIS K7126 under an environment of 23°C temperature and 90% relative humidity, using an oxygen permeability measuring device (manufactured by MOCON [model name: OX-TRAN 2 / 21]). The measurement results are shown in Table 5.

[0185] <<Water vapor transmission rate measurement>> The water vapor permeability was measured using the laminates obtained in Example 2-3 and Comparative Example 2-3. The water vapor permeability was measured in an environment of a temperature of 40°C and a relative humidity of 90% in accordance with the JIS K7129 method, and a water vapor permeability measuring device (a measuring device manufactured by MOCON (model name: PERMATRAN 3 / 33)) was used as the measuring device. The measurement results are shown in Table 5.

[0186] [Table 3]

[0187] [Table 4]

[0188] [Table 5] [Explanation of symbols]

[0189] 10: Printed resin film 11: Polyester film 12: Printing layer 13: First polyester layer 14: Second polyester layer 15: Third polyester layer 20: Laminate 21: Sealant layer 22: First sealant layer 23: Second sealant layer 24: Evaporation film 25: Base material layer 26: Middle class 30: Standing pouch 31: Torso 32: Bottom 40: Pillow bag 50: Three-sided sealed bag 60: Four-sided sealed bag 70: Lid material 71: Container body 80: Laminated tube 81:Head 82: Cylindrical body 83: Outlet part 84:Shoulder 85: Bottom seal 86: Cap 90: Paper containers 91: Torso 92: Bottom 93: Top 94: Inclined plate 95: Folding section 96: Margin 97: Pour spout 98: Cap 100: Paper cup 101: Torso 101': Body blank 101'a: Both ends of the body blank 102: Bottom 102': Bottom blank 102'a: Bend 103: Flange part 104: Body sticker 110: Needle 120: Test piece 121: Seal part 122,123:Gripper

Claims

1. A printed resin film comprising a polyester film and a printed layer, The polyester film is A first polyester layer containing chemically recycled polyester as a main component; A second polyester layer including at least one selected from the group consisting of chemically recycled polyester, mechanically recycled polyester, fossil fuel polyester, and biomass polyester; A third polyester layer containing chemically recycled polyester as a main component; Equipped with A printed resin film, wherein the area ratio of a region having a molecular weight of 1,000 or less in a molecular weight distribution curve obtained by GPC measurement of the polyester film is 1.8% or less of the total peak area.

2. The printed resin film according to claim 1 , wherein the polyester film has a melting point of 250° C. or less.

3. The printed resin film according to claim 1 or 2, wherein the polyester film has a crystallization temperature of 196° C. or lower.

4. The printed resin film according to any one of claims 1 to 3, wherein the static friction coefficient of the surface of the polyester film on which the printed layer is not formed is 0.35 or more.

5. The printed resin film according to any one of claims 1 to 4, wherein the polyester content in each layer of the polyester film is 90% by mass or more and 100% by mass or less.

6. The printed resin film according to any one of claims 1 to 5, wherein the chemically recycled polyester, the mechanically recycled polyester, the fossil fuel polyester, and the biomass polyester are polyethylene terephthalate.

7. The printed resin film according to any one of claims 1 to 6, A sealant layer or an adhesive layer provided on the inner side of the printed resin film; A laminate comprising:

8. A laminate comprising a base layer and a sealant layer or an adhesive layer, The base layer is a polyester film, The polyester film is A first polyester layer containing chemically recycled polyester as a main component; A second polyester layer including at least one selected from the group consisting of chemically recycled polyester, mechanically recycled polyester, fossil fuel polyester, and biomass polyester; A third polyester layer containing chemically recycled polyester as a main component; Equipped with the area ratio of a region of a molecular weight of 1,000 or less in a molecular weight distribution curve obtained by GPC measurement of the polyester film is 1.8% or less of a total peak area; A laminate, wherein the sealant layer or the adhesive layer is provided on the inner side of the base layer.

9. The laminate according to claim 8 , further comprising an intermediate layer between the base layer and the sealant layer or the adhesive layer.

10. Further comprising a printing layer, The laminate according to claim 8 or 9, wherein the base layer and the printed layer are constituted by the printed resin film according to any one of claims 1 to 6.

11. A laminate including a base layer, an intermediate layer, and a sealant layer or an adhesive layer in this order, the intermediate layer comprises a support layer; the support layer is a polyester film, The polyester film is A first polyester layer containing chemically recycled polyester as a main component; A second polyester layer including at least one selected from the group consisting of chemically recycled polyester, mechanically recycled polyester, fossil fuel polyester, and biomass polyester; A third polyester layer containing chemically recycled polyester as a main component; Equipped with the area ratio of a region of a molecular weight of 1,000 or less in a molecular weight distribution curve obtained by GPC measurement of the polyester film is 1.8% or less of a total peak area; A laminate, wherein the sealant layer or the adhesive layer is provided on the inner side of the intermediate layer.

12. Further comprising a printing layer, The laminate according to claim 11, wherein the support layer and the printed layer are composed of the printed resin film according to any one of claims 1 to 6.

13. A packaging container comprising the laminate according to any one of claims 7 to 12.

Images