JP2019006097A - Laminate and packaging bag containing the same - Google Patents

Abstract

To provide a laminate that can reduce environmental load.SOLUTION: A laminate at least contains a substrate layer, a barrier layer, and a sealant layer in the stated order. The substrate layer contains polyethylene terephthalate having biomass-derived ethylene glycol as a diol unit and fossil fuel-derived terephthalic acid as a dicarboxylic acid unit. The barrier layer contains a metal foil.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a laminate including at least a base material layer, a barrier layer, and a sealant layer in this order. Furthermore, it is related with a packaging bag provided with this laminated body.

  A bag made of a soft packaging material such as PET or nylon is used as a bag for storing fluid contents such as liquid and powder and solid contents such as confectionery. Such a bag is configured, for example, as described in Patent Document 1, by forming a seal portion by thermally welding a front surface film and a back surface film facing each other. In this case, the accommodating part for accommodating the contents is defined as a space surrounded by the film and the seal part.

Japanese Patent Laid-Open No. 9-254997

  In recent years, with the increasing demand for the establishment of a recycling-oriented society, in the materials field as well as energy, it is desired to move away from fossil fuels. For example, it is desired to reduce the amount of fossil fuel used by using biomass-derived raw materials for the production of laminates.

  An object of this invention is to provide the packaging bag and laminated body which can solve such a subject effectively.

  The present invention is a laminate comprising at least a base material layer, a barrier layer, and a sealant layer in this order, wherein the base material layer includes biomass-derived ethylene glycol as a diol unit, and fossil fuel-derived terephthalic acid Is a laminate including polyethylene terephthalate having a dicarboxylic acid unit, and the barrier layer includes a metal foil.

  In the laminate according to the present invention, a plurality of through holes penetrating the base material layer may be formed in the base material layer.

  The present invention is a packaging bag comprising the laminate described above.

  ADVANTAGE OF THE INVENTION According to this invention, the laminated body which can reduce environmental impact can be provided.

It is a schematic cross section which shows an example of the laminated body by this invention. It is a schematic cross section which shows an example of the laminated body by this invention. It is a schematic cross section which shows an example of the laminated body by this invention. It is a schematic cross section which shows an example of the laminated body by this invention. It is a top view which shows an example of the base material layer of the laminated body by this invention. It is the elements on larger scale of the base material layer shown in FIG. It is a model front view which shows an example of the packaging bag by this invention. It is a model front view which shows an example of the packaging bag by this invention. It is a top view which shows an example of the laminated body by this invention.

<Laminate>
The laminate according to the present invention includes at least a base material layer, a barrier layer, and a sealant layer in this order. Moreover, the some through-hole which penetrates a base material layer may be formed in the base material layer. The laminate may further include an adhesive layer, a printing layer, other layers, and the like. When the laminate includes two or more adhesive layers and other layers, each may have the same composition or a different composition.

  The laminate according to the present invention will be described with reference to the drawings. Examples of schematic cross-sectional views of the laminate according to the present invention are shown in FIGS.

  The laminate 10 shown in FIG. 1 includes a base material layer 11, an anchor coat layer 141 that constitutes the adhesive layer 14, an adhesive resin layer 142 that constitutes the adhesive layer 14, and a metal foil 121 that constitutes the barrier layer 12. The anchor coat layer 141 constituting the adhesive layer 14, the adhesive resin layer 142 constituting the adhesive layer 14, and the sealant layer 13 are provided in this order. In the packaging bag provided with the laminated body 10, the sealant layer 13 is located on the inner surface side.

  As shown in FIG. 2, in the laminate 10, a plurality of through holes 31 that penetrate the base material layer 11 may be formed in the base material layer 11.

  3 includes a base material layer 21, an adhesive layer 241 that constitutes the adhesive layer 24, a metal foil 221 that constitutes the barrier layer 22, and an adhesive layer 241 that constitutes the adhesive layer 14. The sealant layer 23 is provided in this order. In the packaging bag provided with the laminated body 20, the sealant layer 23 is located on the inner surface side.

  As shown in FIG. 4, in the laminate 20, a plurality of through holes 31 that penetrate the base material layer 21 may be formed in the base material layer 21.

  Hereinafter, each layer which comprises a laminated body is demonstrated.

[Base material layer]
The base material layer 11 includes biomass-derived polyethylene terephthalate (hereinafter also referred to as PET). Biomass-derived PET is PET having biomass-derived ethylene glycol as diol units and fossil fuel-derived terephthalic acid as dicarboxylic acid units. The base material layer may further include fossil fuel-derived PET in which fossil fuel-derived ethylene glycol is a diol unit and fossil fuel-derived terephthalic acid is a dicarboxylic acid unit. The following biomass degree should just be implement | achieved as the whole base material layer. In the present invention, since the base material layer contains biomass-derived PET, the amount of PET derived from fossil fuel can be reduced and the environmental load can be reduced compared to the conventional case.

In the present invention, “biomass degree” (carbon concentration derived from biomass) is a value obtained by measuring the content of carbon derived from biomass by measurement of radioactive carbon (C14). Since carbon dioxide in the atmosphere contains C14 at a constant ratio (105.5 pMC), the C14 content in plants that grow by incorporating carbon dioxide in the atmosphere, for example, corn, is also about 105.5 pMC. It is known. It is also known that fossil fuel contains almost no C14. Therefore, the ratio of carbon derived from biomass can be calculated by measuring the ratio of C14 contained in all carbon atoms in PET. In the present invention, in the case where the content of C14 in PET was P _C14, the content P _{bio Bio} carbon from biomass, can be obtained as follows.
P _bio (%) = P _C14 /105.5×100

PET is a polymer in which ethylene glycol containing 2 carbon atoms and terephthalic acid containing 8 carbon atoms are polymerized at a molar ratio of 1: 1. The carbon content P _bio of the origin is 20%. In the present invention, the content of biomass-derived carbon by radioactive carbon (C14) measurement is preferably 10% or more and 20% or less, and preferably 10% or more and 19% with respect to the total carbon in biomass-derived PET. It may be the following. When the content of carbon derived from biomass in biomass-derived PET is 10% or more, it is suitable as a carbon offset material. In addition, the biomass-derived carbon content in the fossil fuel-derived PET produced using fossil fuel-derived ethylene glycol and the fossil fuel-derived dicarboxylic acid is 0%, and the biomass degree of the fossil fuel-derived PET Becomes 0%.

  In this invention, the biomass degree of a base material layer is 5% or more, Preferably it is 10% or more, More preferably, it is 15% or more. If the degree of biomass of the base material layer is 5% or more, the amount of PET derived from fossil fuel can be reduced and the environmental load can be reduced compared to the conventional case.

  When the base material layer is a stretched PET film, the PET film used for the base material layer has a tensile strength in the MD direction, preferably 150 MPa or more and 300 MPa or less, more preferably 200 MPa or more and 300 MPa or less, preferably in the TD direction. Is 150 MPa or more and 300 MPa or less, more preferably 150 MPa or more and 300 MPa or less, and the tensile elongation is MD direction, preferably 50% or more and 250% or less, more preferably 70% or more and 200% or less, and TD direction. And preferably 50% or more and 250% or less, more preferably 60% or more and 200% or less. The tensile strength and tensile elongation can be measured according to JIS K 7127.

  The base material layer preferably has a thickness of 5 μm or more and 40 μm or less, more preferably 8 μm or more and 25 μm or less. If the thickness of the base material layer is in the above range, the molding process is easy and it can be suitably used as a packaging material.

  Next, the through holes formed in the base material layer shown in FIGS. 2 and 4 will be described with reference to FIGS. 2 and 4 to 6. Here, FIG. 5 is a plan view showing an example of the base material layer, and FIG. 6 is a partially enlarged view of the base material layer shown in FIG.

  As shown in FIGS. 2 and 4 to 6, the base material layers 11 and 21 are formed with a plurality of through-holes 31 that penetrate the base material layers 11 and 21 and constitute the plurality of scar groups 30. . In addition, the some scar group 30 is provided in the position corresponding to the predetermined position of each packaging bag, when a some packaging bag is produced from the laminated bodies 10 and 20. FIG.

  As shown in FIGS. 5 and 6, a plurality of through holes 31 are arranged in a first direction D1 which is the longitudinal direction of the laminate and a second direction D2 orthogonal to the first direction D1. The width W of the scar group 30 in the first direction D1, that is, the existence range of the through holes 31, is, for example, 5 mm or more and 20 mm or less. Further, the length L of the scar group 30 in the second direction D2, that is, the existence range of the through holes 31, is, for example, not less than 10 mm and not more than 35 mm.

  As shown in FIGS. 2 and 4, the through hole 31 penetrates the base material layers 11 and 21. Such a through-hole 31 can be formed in the base material layers 11 and 21 by processing the PET film which comprises the base material layers 11 and 21, for example using the rotary die roll provided with the cutting blade. In addition, the specific structure of the through hole 31 is not particularly limited as long as the ease of breaking the packaging bag in which the laminates 10 and 20 are used can be increased.

[Adhesive layer]
The adhesive layer is a layer provided when two arbitrary layers are bonded, and can be provided, for example, between the base material layer and the barrier layer, or between the barrier layer and the sealant layer.

  The adhesive resin layer constituting the adhesive layer of the laminate shown in FIGS. 1 and 2 can be formed by a conventionally known method such as a melt extrusion laminating method or a sand laminating method. Examples of the thermoplastic resin that can be used for the adhesive resin layer include a polyethylene resin, a polypropylene resin, or a cyclic polyolefin resin, or a copolymer resin, a modified resin, or a mixture (including alloy) containing these resins as a main component. ) Can be used. Examples of polyolefin resins include low density polyethylene (LDPE), medium density polyethylene (MDPE), high density polyethylene (HDPE), linear (linear) low density polyethylene (LLDPE), polypropylene (PP), and metallocene catalysts. Ethylene-α / olefin copolymer, ethylene / polypropylene random or block copolymer, ethylene-vinyl acetate copolymer (EVA), ethylene-acrylic acid copolymer (EAA), ethylene Ethyl acrylate copolymer (EEA), ethylene-methacrylic acid copolymer (EMAA), ethylene-methyl methacrylate copolymer (EMMA), ethylene / maleic acid copolymer, ionomer resin, and interlayer adhesion In order to improve the , It can be used acrylic acid, methacrylic acid, maleic acid, maleic anhydride, fumaric acid, and an acid-modified polyolefin resin modified with an unsaturated carboxylic acid such as itaconic acid. Further, a resin obtained by graft polymerization or copolymerization of an unsaturated carboxylic acid, an unsaturated carboxylic acid anhydride, or an ester monomer can be used as the polyolefin resin. These materials can be used alone or in combination of two or more. As the cyclic polyolefin-based resin, for example, cyclic polyolefins such as ethylene-propylene copolymer, polymethylpentene, polybutene, and polynorbornene can be used. These resins can be used alone or in combination. In addition, as said polyethylene-type resin, what used the above ethylene derived from biomass as a monomer unit can be used, and a biomass degree can further be improved.

  When the adhesive resin layer is laminated by the melt extrusion laminating method, an anchor coat layer formed by applying an anchor coat agent and drying it may be provided on the surface of the layer to be laminated. Examples of the anchor coating agent include an anchor coating agent made of any resin having a heat resistant temperature of 135 ° C. or higher, such as a vinyl-modified resin, an epoxy resin, a urethane resin, a polyester resin, or a polyethyleneimine. An anchor coating agent that is a cured product of a polyacrylic or polymethacrylic resin (polyol) having two or more hydroxyl groups and an isocyanate compound as a curing agent can be preferably used. Moreover, a silane coupling agent may be used in combination as an additive, and nitrified cotton may be used in combination in order to improve heat resistance.

  The anchor coat layer after drying has a thickness of 0.1 μm or more and 1 μm or less, preferably 0.3 μm or more and 0.5 μm or less. The adhesive layer after drying has a thickness of 1 μm to 10 μm, preferably 2 μm to 5 μm. The adhesive resin layer preferably has a thickness of 5 μm to 50 μm, preferably 10 μm to 30 μm.

  The adhesive layer constituting the adhesive layer of the laminate shown in FIGS. 3 and 4 can be formed by a conventionally known method, for example, a dry laminating method. When two layers are bonded by a dry laminating method, the adhesive layer is formed by applying an adhesive to the surface of the layer to be laminated and drying it. Examples of the adhesive to be applied include one-part or two-part cured or non-cured vinyl, (meth) acrylic, polyamide, polyester, polyether, polyurethane, epoxy, and rubber. It is possible to use an adhesive such as a solvent type, an aqueous type, or an emulsion type. As a two-component curable adhesive, a cured product of a polyol and an isocyanate compound can be used. As a coating method of the adhesive for laminating, for example, direct gravure roll coating method, gravure roll coating method, kiss coating method, reverse roll coating method, fountain method, transfer roll coating method, and other methods can be used. .

[Sealant layer]
The sealant layer is the innermost layer side when a package is used. The sealant layer is a layer formed of a thermoplastic resin that can be fused to each other by heat. The sealant layer may contain a fossil fuel-derived resin material or a biomass-derived resin material.

  The resin material forming the sealant layer is not particularly limited as long as it is a resin that can be fused to each other by heat. Specifically, for example, low density polyethylene (LDPE), medium density polyethylene (MDPE), high Density polyethylene (HDPE), linear (linear) low density polyethylene (LLDPE), ethylene-α-olefin copolymer polymerized using a metallocene catalyst, ethylene-polypropylene random or block copolymer, polypropylene, Ethylene-vinyl acetate copolymer (EVA), ethylene-acrylic acid copolymer (EAA), ethylene-ethyl acrylate copolymer (EEA), ethylene-methacrylic acid copolymer (EMAA), ethylene-methyl methacrylate Copolymer (EMMA), ionomer resin, heat sealable ethylene Alcohol resin, or methylpentene resin, ethylene-propylene copolymer, methylpentene polymer, polybutene polymer, polyolefin resin such as polyethylene, polypropylene or cyclic olefin copolymer, polyolefin resin such as acrylic acid, methacrylic acid, maleic acid Resin such as acid-modified polyolefin resin modified with unsaturated carboxylic acid such as maleic anhydride, fumaric acid, itaconic acid, polyvinyl acetate resin, poly (meth) acrylic resin, polyvinyl chloride resin, etc. Can be mentioned. These may be used alone or as a mixture of two or more. The sealant layer can be used as a resin film or sheet as described above, or a coating film thereof.

  When polyethylene is used as the resin material for forming the sealant layer, a raw material obtained by polymerizing ethylene derived from biomass in addition to ethylene obtained from fossil fuel may be used. Specifically, as the ethylene derived from biomass, for example, those described in JP 2012-251006 A can be used. By using polyethylene obtained by polymerizing ethylene derived from biomass as a material constituting the sealant layer, it can be formed with a layer made of a carbon neutral material. Can be reduced, and the environmental load can be reduced.

  Commercially available ethylene may be used as biomass-derived ethylene, for example, “C4LL-LL118 (d = 0.916, MFR = 1.0 g / 10 min)” made by Braschem Co. A low density polyethylene resin or a sugarcane-derived low density polyethylene resin of “SBC118 (d = 0.918, MFR = 8.1 g / 10 min)” can be used.

  In this embodiment, the sealant layer is a single layer, but two or more sealant layers may be provided. When two or more sealant layers are included, each may have the same composition or a different composition. For example, the sealant layer is composed of three layers in which a first layer, a second layer, and a third layer are sequentially laminated, and the first layer and the third layer are made of a fossil fuel-derived resin material, and the second layer This layer may be a resin material containing a biomass-derived resin material. In addition, when comprising a sealant layer by two or more layers, it can laminate | stack using a coextrusion method.

  The thickness of the sealant layer is preferably 10 or more and 80 μm or less, and more preferably 20 or more and 50 μm or less.

[Barrier layer]
The barrier layer includes a metal foil. A conventionally known metal foil can be used as the metal foil constituting the barrier layer. Aluminum foil is preferred from the viewpoints of gas barrier properties that prevent transmission of oxygen gas, water vapor, and the like, and light shielding properties that prevent transmission of visible light, ultraviolet light, and the like. The thickness of the metal foil is, for example, 5 μm or more and 15 μm or less.

[Other layers]
The laminate according to the present invention may further include a printed layer as another layer. The printed layer can be used to display decorations, contents, display of the best-before period, display of manufacturers, sellers, etc., and display of other characters and letters, numbers, pictures, figures, symbols, patterns, etc. It is a layer for forming a desired arbitrary printed pattern. A printing layer can be provided as needed, for example, can be provided between a base material layer and a barrier layer. The printing layer may be provided on the entire surface of the base material layer, or may be provided on a part thereof. A printing layer can be formed using a conventionally well-known pigment and dye, The formation method is not specifically limited.

  The printed layer preferably has a thickness of 0.1 μm to 10 μm, more preferably 1 μm to 5 μm, and still more preferably 1 μm to 3 μm.

<Method for producing laminate>
The manufacturing method of the laminated body by this invention is not specifically limited, It can manufacture using conventionally well-known methods, such as a melt extrusion laminating method.

  The laminate according to the present invention is provided with chemical functions, electrical functions, magnetic functions, mechanical functions, friction / abrasion / lubrication functions, optical functions, thermal functions, surface functions such as biocompatibility, etc. For the purpose, it is also possible to perform secondary processing. Examples of secondary processing include embossing, painting, adhesion, printing, metalizing (plating, etc.), machining, surface treatment (antistatic treatment, corona discharge treatment, plasma treatment, photochromism treatment, physical vapor deposition, chemical vapor deposition, Coating, etc.). Further, the laminate according to the present invention can be subjected to laminating processing (dry laminating or extrusion laminating), bag making processing, and other post-processing processing to produce a molded product.

<Packaging bag>
The packaging bag by this invention can be used conveniently, for example, when accommodating the contents which have fluidity | liquidity, such as powder. Such a packaging bag uses, for example, the above-mentioned laminated body, and folds it into two or three folds, or prepares two such laminated bodies, and laminates the surface and back side of the sealant layer of the front side laminated body. For example, side seal type, two-side seal type, three-side seal type, four-side seal type, envelope-attached seal type, joint-attached seal type ( Various types of packaging bags can be manufactured by heat-sealing by a heat-sealing form such as a pillow-sealed type, a pleated seal type, a flat bottom seal type, or a square bottom seal type. Further, a gusset-type packaging bag can be manufactured by performing heat sealing in a state where the folded-up laminate is inserted between the laminate on the front side and the laminate on the back side. In addition, all the laminated bodies which comprise a packaging bag may not be the said laminated body by this invention. That is, at least a part of the laminate constituting the packaging bag may be a laminate having a base material layer containing biomass-derived PET, and the other part of the laminate constituting the packaging bag is fossil fuel-derived PET. The laminated body containing the base material layer which consists of may be sufficient.

  In the above, as a heat sealing method, for example, a known method such as a bar seal, a rotary roll seal, a belt seal, an impulse seal, a high frequency seal, and an ultrasonic seal can be used.

  The packaging bag can have excellent gas barrier properties, light shielding properties, dead hold properties and hand cutting properties while exhibiting a high degree of biomass. For this reason, a packaging bag can be conveniently used as packaging of food-drinks, liquid detergents, cosmetics, and chemical products, for example.

  The packaging bag by this invention is demonstrated referring drawings. In the following example, first, an example in which a packaging bag is formed using a laminated body that is not provided with the scar group 30 shown in FIG. 1 or FIG. 3 will be described.

  In FIG. 7, the top view (form of a pillow bag) of the packaging bag 70 is shown. As shown in FIG. 7, the outline of the packaging bag 70 is such that the upper edge 71 and the lower edge 72 that face each other in the first direction D1 and the first that face each other in the second direction D2 orthogonal to the first direction D1. A side edge 73 and a second side edge 74.

  Further, the packaging bag 70 is formed with a seal portion in which the laminate sealant layer constituting the front surface 75 and the laminate sealant layer constituting the back surface 76 are joined by heat welding or the like. The seal portion includes an upper seal portion 71 a extending along the upper edge 71, a lower seal portion 72 a extending along the lower edge 72, and between the first side edge 73 and the second side edge 74, for example, the first side edge 73. And the second side edge 74, and a palm seal portion 77 extending from the upper edge 71 toward the lower edge 72. The joint seal part 77 is a part also called a back seal part.

  As shown in FIG. 7, the packaging bag 70 includes a laminate that is folded between the front surface 75 and the back surface 76, extends from the upper edge 71 to the lower edge 72 along the first direction D <b> 1, In the two directions D2, a pair of side gusset portions 78 facing each other is further provided. As shown in FIG. 7, the laminate between the front surface 75 and the back surface 76 is folded so that the folded portion 78a is positioned inside. Such a packaging bag can be suitably used as, for example, a powder packaging.

  Next, the example which forms a packaging bag using the laminated body in which the some scar group 30 shown in FIG. 2 or FIG. 4 was provided is demonstrated.

  In FIG. 8, the top view (form of pillow bag) of the packaging bag 50 is shown. As shown in FIG. 58, the outline of the bag 50 includes an upper edge 51 and a lower edge 52 that face each other, and a direction from the upper edge 51 toward the lower edge 52, and a first side edge 53 and a second side that face each other. And an edge 54.

  Further, the packaging bag 50 is formed with a seal portion in which the laminate sealant layer constituting the front surface 55 and the laminate sealant layer constituting the back surface 56 are joined by heat welding or the like. The seal portion includes an upper seal portion 51 a extending along the upper edge 51, a lower seal portion 52 a extending along the lower edge 52, and between the first side edge 53 and the second side edge 54, for example, the first side edge 53. And the second side edge 54, and a palm seal portion 57 extending from the upper edge 51 toward the lower edge 52. The joint seal part 57 is a part also called a back seal part.

  As shown in FIG. 8, an easy-open line 58 is formed on the laminated body constituting the surface 55. This easy-open line 58 includes the scar group 30 described above. As shown in FIG. 8, the easy-open line 58 is formed so as to extend in a direction (second direction D <b> 2) from the first side edge 53 toward the second side edge 54. Although not shown, an easy-open line 58 is also formed on the laminate constituting the back surface 56.

  For example, as shown in FIGS. 2 and 4, the scar group 30 constituting the easy-open line 58 penetrates the base material layer of the laminate, but does not penetrate the overcoat layer, the adhesive resin layer, and the barrier layer. It includes a plurality of through holes 31 formed. For this reason, the packaging bag 50 can have excellent hand cutting properties and excellent barrier properties. Note that the easy-open line 58 may be formed so as to overlap the palm seal part 57. Here, “overlapping” means that when the packaging bag 50 is viewed along the direction perpendicular to both the first direction D1 and the second direction D2, that is, along the thickness direction of the packaging bag 50, This means that the palm seal part 57 overlaps. In this case, the hand cutting property of the packaging bag 50 can be further improved.

  In such a packaging bag 50, for example, the laminates 10 and 20 shown in FIG. 9 are tri-folded so that imaginary lines (two-dot chain lines) Lc and Ld are creased to form a seal portion and separate into individual pieces. Can be obtained. Note that virtual lines La, Lb, Lc, and Ld shown in FIG. 9 correspond to the upper edge 51, the lower edge 52, the first side edge 53, and the second side edge 54 of the packaging bag 50 shown in FIG. . Thus, by providing the 1st side edge 53 in the presence range of the through-hole 31, the easy-open line 58 is formed in both the laminated body which comprises the surface 55, and the laminated body which comprises the back surface 56. FIG.

  EXAMPLES Next, although an Example demonstrates this invention further more concretely, this invention is not limited to description of a following example, unless the summary is exceeded.

[Example 1]
Biaxially stretched biomass-derived PET film (biomass) formed using terephthalic acid derived from fossil fuel and biomass-derived ethylene glycol (biomass polyester) as the base material layer described in FIGS. (Degree: 13%, thickness 12 μm). Subsequently, low-density polyethylene (manufactured by Nippon Polyethylene, LC701, thickness 15 μm) is applied as an adhesive resin layer to the surface located on the inner surface side of the biomass-derived PET film when the packaging bag is formed by an extrusion laminating method. Then, it was extruded at a resin temperature of 290 ° C. through an anchor coating agent, and an aluminum foil (6 μm) was laminated on the adhesive resin layer as a barrier layer. Subsequently, low-density polyethylene (manufactured by Nippon Polyethylene, LC701, thickness 15 μm) is used as an adhesive resin layer on the surface of the aluminum foil where the adhesive resin layer is not laminated, by an anchoring agent by extrusion lamination. Extruded at a resin temperature of 290 ° C., a linear low density polyethylene film (manufactured by Aicello, L-143K, thickness 40 μm) is laminated on the adhesive resin layer as a sealant layer, and the lamination shown in FIG. A body 10 was produced. The layer configuration of the laminate 10 is expressed as follows.
Bio-PET / AC / Contact / ALM / AC / Contact / PEF
“/” Represents a boundary between layers. The leftmost layer is a layer constituting the outer surface of the laminate, and the rightmost layer is a layer constituting the inner surface of the laminate.
“BioPET” means biomass-derived PET film. “AC” means an anchor coat layer. “Contact” means an adhesive resin layer. “ALM” means aluminum foil. “PEF” means an unstretched polyethylene film.

[Comparative Example 1]
A laminated body was produced in the same manner as in Example 1 except that a biaxially stretched PET film (produced by Saiichi Kogyo Co., Ltd., SSN, thickness 12 μm) on which an aluminum deposited film was formed was used as the barrier layer. did. The layer structure of the laminate is expressed as follows.
Bio PET / AC / contact / AL deposition PET / AC / contact / PEF
“AL vapor-deposited PET” means a PET film having an aluminum vapor-deposited film formed thereon.

[Comparative Example 2]
Biaxially stretched fossil fuel-derived PET film (biomass degree: 0%, manufactured by Toyobo, E5100, thickness) formed using terephthalic acid derived from fossil fuel and ethylene glycol derived from fossil fuel as the base material layer A laminate was produced in the same manner as in Example 1 except that 12 μm) was used. The layer structure of the laminate is expressed as follows.
Fossil PET / AC / contact / ALM / AC / contact / PEF
“Fossil PET” means a PET film derived from fossil fuel.

<Evaluation of gas barrier properties>
The oxygen permeability of the laminates obtained in Example 1, Comparative Example 1 and Comparative Example 2 was measured using the MOCON method in a 23 ° C. × 90% RH environment according to JISK7126-1. Further, the water vapor permeability of the laminates obtained in Example 1, Comparative Example 1 and Comparative Example 2 was measured using the MOCON method in a 40 ° C. × 90% RH environment in accordance with JISK7129B.

  The results of the performance evaluation are shown in Table 1. As shown in Table 1, the evaluation results showed that the gas barrier property was better in Example 1 than in Comparative Example 1. Moreover, also in Example 1 of the biomass-derived product capable of reducing the environmental load, the gas barrier property was good as in Comparative Example 2 of the fossil fuel-derived product.

<Evaluation of light shielding properties>
The total light transmittance of the laminate was measured by making light incident on the laminate obtained in Example 1, Comparative Example 1 and Comparative Example 2 from the base material layer side. The measurement was performed according to JISK7361 using HazeMeter manufactured by Murakami Color Research Laboratory.

  The results of the performance evaluation are shown in Table 1. As shown in Table 1, the evaluation results were better in light shielding property in Example 1 than in Comparative Example 1. Moreover, also in Example 1 of the biomass-derived product capable of reducing the environmental load, the light shielding property was good as in Comparative Example 1 of the fossil fuel-derived product.

<Evaluation of dead hold property>
Five laminates obtained in Example 1, Comparative Example 1 and Comparative Example 2 were prepared. Subsequently, each laminated body was bent at 180 degrees, and the bent state was maintained by hand for about 5 seconds. Next, after releasing the folded state by releasing the hand, the angle formed by the folded portion was immediately measured with a protractor. The average value was taken as the return angle after bending 180 degrees. The measurement was performed at a temperature of 23 ° C. and a humidity of 55%.
(Evaluation criteria)
○: Return angle is less than 30 degrees.
X: The return angle is 30 degrees or more.

The results of the performance evaluation are shown in Table 1. As shown in Table 1, the evaluation results were better in the dead hold property in Example 1 than in Comparative Example 1. Moreover, also in Example 1 of the biomass-derived product capable of reducing the environmental load, the dead hold property was good as in Comparative Example 2 of the fossil fuel-derived product.

[Example 2]
In the case of Example 1 except that a plurality of through-holes were formed using a rotary die roll provided with a cutting edge on the prepared biomass-derived PET film as the base material layer described in FIGS. 2 and 4 above. A laminate was produced in the same manner as described above. The layer structure of the laminate is expressed as follows.
Bio-PET / AC / Contact / ALM / AC / Contact / PEF

[Comparative Example 3]
Biaxially stretched fossil fuel-derived PET film (biomass degree: 0%, manufactured by Toyobo, E5100, thickness) formed using terephthalic acid derived from fossil fuel and ethylene glycol derived from fossil fuel as the base material layer A laminate was produced in the same manner as in Example 2 except that 12 μm) was used. The layer structure of the laminate is expressed as follows.
Fossil PET / AC / contact / ALM / AC / contact / PEF

<Manufacture of pillow bags>
The sealant layers of the laminates obtained in Example 2 and Comparative Example 3 were heat-sealed to produce a pillow bag shown in FIG.

<Evaluation of cutting ability>
Using the laminates obtained in Example 2 and Comparative Example 3, five pillow bags shown in FIG. 8 each prepared in the same manner as described above were prepared. Then, the hand cutting property when cutting the packaging bag along the scar group was confirmed.
(Evaluation criteria)
◯: All five samples could be cut without applying excessive force.
X: Even one sample could not be cut unless excessive force was applied.

The results of the performance evaluation test are shown in Table 2. As shown in Table 2, the evaluation results were good in hand cutting properties as in Comparative Example 3 of the fossil fuel-derived product in Example 2 of the biomass-derived product capable of reducing the environmental load.

DESCRIPTION OF SYMBOLS 10 Laminated body 11 Base material layer 12 Barrier layer 13 Sealant layer 20 Laminated body 21 Base material layer 22 Barrier layer 23 Sealant layer 31 Through-hole 50 Packaging bag

Claims (3)

At least a laminate comprising a base material layer, a barrier layer, and a sealant layer in this order,
The base material layer includes polyethylene terephthalate having biomass-derived ethylene glycol as a diol unit and fossil fuel-derived terephthalic acid as a dicarboxylic acid unit,
The said barrier layer is a laminated body containing metal foil.   The laminate according to claim 1, wherein a plurality of through holes penetrating the base material layer are formed in the base material layer.   A packaging bag comprising the laminate according to claim 1.