Laminate and packaging bag

Abstract

To provide a packaging bag which suppresses deformation of a laminate due to heat sealing while maintaining oxygen barrier properties and water vapor barrier properties, and includes the laminate excellent in recyclability and a zipper tape.SOLUTION: A packaging bag including a laminate, the laminate including a base material, an adhesive layer, and a sealant layer, the laminate further including a vapor deposition film between the adhesive layer and the sealant layer, the laminate including the vapor deposition film on one surface of the sealant layer, the adhesive layer being a cured product of a two part curable adhesive containing a polyester polyol and an isocyanate compound, the polyester polyol is a polyester polyol obtained by polycondensation of an ortho-oriented polyvalent carboxylic acid or an anhydride thereof with a polyhydric alcohol, a polyester polyol having a glycerol skeleton, or a polyester polyol having an isocyanuric ring, the vapor deposition film is an aluminum vapor deposition film, the base material is a stretched resin film, and the base material and the sealant layer contain the same resin material.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a laminate and a packaging bag including the laminate. [Background technology]

[0002] Conventionally, resin films made of resin materials have been used as a constituent material for packaging bags. Furthermore, packaging bags are required to have various properties, such as oxygen barrier properties and water vapor barrier properties, depending on the contents to be filled, and therefore laminates made of multiple resin films are widely used. For example, resin films made of thermoplastic resins such as polypropylene and polyethylene alone cannot ensure sufficient strength for use as packaging bags, so they are laminated with resin films made of polyesters such as polyethylene terephthalate. Furthermore, in order to improve oxygen barrier properties and water vapor barrier properties, resin films made of polyamide or metal foils have been laminated, or vapor-deposited films have been formed on resin films (for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2009-202519 Summary of the Invention [Problem to be solved by the invention]

[0004] Some packaging bags have a zipper tape on the inside of the bag (hereinafter also referred to as a zippered packaging bag). When producing such a zippered packaging bag, the laminate and the zipper tape are heated to heat seal the laminate, and this heat sealing is performed by applying heat to the surface of the laminate opposite to the side where the zipper tape is heat sealed.

[0005] Generally, heat sealing between a laminate and a zipper tape requires heating for a longer period of time than heat sealing between laminates. The above-mentioned laminates with improved strength and barrier properties are characterized by a large number of layers and a large thickness because they include resin films made of polyester or polyamide, metal foil, etc. However, when such laminates are used to heat-seal the laminate and zipper tape, heating at a higher temperature than usual for a long period of time is required, which can cause the laminate, particularly the layer on the heated side, to melt and deform its surface, potentially damaging the appearance.

[0006] Furthermore, in recent years, along with the growing demand for the creation of a recycling-oriented society, attempts have been made to recycle and reuse packaging bags. However, when multiple different resin films are bonded together, it is difficult to separate the resin films, making them unsuitable for recycling, and there has been a demand for packaging bags that have a lower environmental impact.

[0007] In order to suppress deformation of the laminate due to the heat sealing described above and to improve recyclability, the present inventors attempted to produce a zippered packaging bag using a laminate with a small number of layers, which included an oriented polypropylene resin film, an adhesive layer made of a two-component curing urethane adhesive, an aluminum vapor-deposited film, and an unoriented polypropylene resin film. However, it has been found that zippered packaging bags are formed by a former or the like provided in a packaging machine during production and filling of the contents, and that the forming process imposes a large bending load on the packaging bag, resulting in a deterioration in the oxygen barrier property and water vapor barrier property of the zippered packaging bag.It has also been found that the heat generated when heat-sealing the laminate and the zipper tape further deteriorates the oxygen barrier property and water vapor barrier property of the zippered packaging bag.

[0008] The present invention has been made to solve the above problems, and the problem to be solved by the present invention is to provide a laminate that suppresses deformation of the laminate due to heat sealing while maintaining the oxygen barrier property and water vapor barrier property of the laminate, and that has excellent recyclability.

[0009] A further object of the present invention is to provide a packaging bag comprising the laminate and a zipper tape. [Means for solving the problem]

[0010] The present invention provides a packaging bag comprising a laminate, the laminate comprising a substrate, an adhesive layer, and a sealant layer, the laminate further comprising a vapor-deposited film between the adhesive layer and the sealant layer, the laminate comprising the vapor-deposited film on one side of the sealant layer, the adhesive layer being a cured product of a two-component curing adhesive containing a polyester polyol and an isocyanate compound, the polyester polyol being a polyester polyol obtained by polycondensation of an ortho-oriented polycarboxylic acid or an anhydride thereof with a polyhydric alcohol, a polyester polyol having a glycerol skeleton, or a polyester polyol having an isocyanuric ring, the vapor-deposited film being an aluminum vapor-deposited film, the substrate being a stretched resin film, the substrate and the sealant layer containing the same resin material, the same resin material being polypropylene, and the packaging bag comprising a zipper tape heat-sealed onto the sealant layer.

[0011] In the packaging bag according to the present invention, the sealant layer may be an unstretched resin film.

[0012] In the packaging bag according to the present invention, the content of the same resin material may be 90% by mass or more.

[0013] In the packaging bag according to the present invention, the thickness of the laminate may be 10 μm or more and 130 μm or less.

[0014] In the packaging bag according to the present invention, the adhesive layer may have a thickness of 0.5 μm or more and 6 μm or less.

[0015] In the packaging bag according to the present invention, the vapor-deposited film may have a thickness of 1 nm or more and 140 nm or less.

[0016] In the packaging bag according to the present invention, the substrate, the sealant layer, and the zipper tape may contain the same resin material, and the same resin material may be polypropylene. [Effects of the Invention]

[0017] According to the present invention, it is possible to provide a laminate that maintains the oxygen barrier property and water vapor barrier property of the laminate, suppresses deformation of the laminate due to heat sealing, and has excellent recyclability.

[0018] Furthermore, according to the present invention, a packaging bag can be provided that includes the laminate and a zipper tape. [Brief explanation of the drawings]

[0019] [Figure 1] 1 is a cross-sectional schematic view showing one embodiment of a laminate of the present invention. [Figure 2] 1 is a front view showing an example of a packaging bag including a laminate of the present invention and a zipper tape. [Figure 3] 3 is a cross-sectional view showing the packaging bag shown in FIG. 2 as viewed along line AA. [Figure 4] FIG. 1 is a front perspective view showing an example of a packaging bag including the laminate of the present invention and a zipper tape. [Figure 5] FIG. 1 is a rear perspective view showing an example of a packaging bag including the laminate of the present invention and a zipper tape. [Figure 6] 1 is a front view showing an example of a packaging bag including a laminate of the present invention and a zipper tape. DETAILED DESCRIPTION OF THE INVENTION

[0020] (Laminate) As shown in FIG. 1, the laminate 10 of the present invention comprises a substrate 11, an adhesive layer 12, and a sealant layer 13, and further comprises a vapor-deposited film 14 between the adhesive layer 12 and the sealant layer 13.

[0021] The substrate and the sealant layer of the laminate of the present invention contain the same resin material, which is polypropylene, thereby improving the recyclability of packaging bags including the laminate. In the present invention, the terms "same resin material" and "same resin material" mean that the resin classification is the same.

[0022] In the laminate, the content of the same resin material is preferably 90% by mass or more, more preferably 92% by mass or more, and even more preferably 94% by mass or more, which can further improve recyclability. The content of the same resin material in the laminate means the ratio of the same resin material to the sum of the contents of the resin materials in the layers constituting the laminate.

[0023] The laminate has an oxygen permeability of 0.05cc / m under an environment of 23°C and 90% relative humidity. 2 / day / atm or more 2.0cc / m 2 / day / atm or less is preferable, and 0.05cc / m 2 / day / atm or more 1.0cc / m 2 It is preferable that it is / day / atm or less. In the present invention, the oxygen permeability is measured in accordance with JIS K 7126.

[0024] The laminate has a water vapor permeability of 0.01 g / m at 40°C and 90% relative humidity. 2 / day / atm or more 2.0g / m 2 / day / atm or less is preferable, and 0.01 g / m 2 / day / atm or more 1.0g / m 2 It is preferable that it is / day / atm or less. In the present invention, the oxygen permeability is measured in accordance with JIS K 7129.

[0025] The thickness of the laminate is preferably 10 μm or more and 130 μm or less, and more preferably 15 μm or more and 110 μm or less, which can further suppress deformation of the laminate due to heat sealing.

[0026] (base material) The base material includes polypropylene. The polypropylene may be a homopolymer, a random copolymer, or a block copolymer. A polypropylene homopolymer is a polymer of only propylene, a polypropylene random copolymer is a random copolymer of propylene and an α-olefin other than propylene (e.g., ethylene, butene-1, 4-methyl-1-pentene, etc.), and a polypropylene block copolymer is a copolymer having a polymer block made of propylene and a polymer block made of the above-mentioned α-olefin other than propylene.

[0027] The substrate is a stretched resin film. This provides the packaging bag with sufficient strength and heat resistance. The stretched resin film may be a uniaxially stretched resin film or a biaxially stretched resin film. Furthermore, the stretched resin film may be a stretched polypropylene resin film made of polypropylene.

[0028] The substrate may be a laminate of two or more of the above-mentioned resin films. The resin film laminate can be produced by using a dry lamination method, a wet lamination method, an extrusion method, or the like.

[0029] The substrate may contain additives such as fillers, plasticizers, antistatic agents, ultraviolet absorbers, inorganic particles, organic particles, release agents, and dispersants, as long as the properties of the present invention are not impaired.

[0030] The substrate may have an image formed on its surface. It is preferable to form the image on the adhesive layer side of the substrate, since this can prevent the formed image from coming into contact with the outside air. The image to be formed is not particularly limited, and may be a character, a pattern, a symbol, or a combination thereof. The image formation can be performed using conventionally known inks, but is preferably performed using ink derived from biomass, which allows the laminate to be used to produce packaging bags with a lower environmental impact. The method for forming the image is not particularly limited, and examples thereof include conventionally known printing methods such as gravure printing, offset printing, and flexographic printing.

[0031] The substrate is preferably subjected to a surface treatment, which can improve adhesion to adjacent layers. The method of surface treatment is not particularly limited, and examples thereof include physical treatments such as corona discharge treatment, ozone treatment, low-temperature plasma treatment using oxygen gas and / or nitrogen gas, and glow discharge treatment, as well as chemical treatments such as oxidation treatment using chemicals.

[0032] The thickness of the substrate is preferably 5 μm or more and 50 μm or less, and more preferably 10 μm or more and 40 μm or less. This makes it possible to further suppress deformation of the laminate due to heat sealing. It also makes it possible to improve the mechanical strength and processability of the laminate.

[0033] (adhesive layer) The adhesive layer is a cured product of a two-component curing adhesive containing a polyester polyol and an isocyanate compound, where the polyester polyol is a polyester polyol obtained by polycondensation of an ortho-oriented polycarboxylic acid or its anhydride with a polyhydric alcohol, a polyester polyol having a glycerol skeleton, or a polyester polyol having an isocyanuric ring. When a laminate with a vapor-deposited film is applied to a packaging bag, bending loads are applied to the laminate by a molding machine or the like, which can cause cracks in the vapor-deposited film. By using the adhesive layer as a cured product of the two-component curing adhesive, the oxygen barrier property and water vapor barrier property of the laminate can be maintained even if cracks occur in the vapor-deposited film. This also eliminates the need for resin films or metal foils made of polyester or polyamide, allowing for a thinner laminate with fewer layers and reduced thermal load due to heat sealing between the laminate and zipper tape. This suppresses deformation of the laminate due to heat sealing.

[0034] The polyester polyol has two or more hydroxyl groups as functional groups in one molecule. The isocyanate compound has two or more isocyanate groups as functional groups in one molecule. The polyester polyol has, for example, a polyester structure or a polyester polyurethane structure as the main skeleton.

[0035] As a specific example of a two-component curing adhesive containing a polyester polyol and an isocyanate compound, the PASLIM series sold by DIC Corporation can be used.

[0036] The two-component curing adhesive may further contain a plate-like inorganic compound, a coupling agent, cyclodextrin and / or a derivative thereof, and the like.

[0037] As the polyester polyol having two or more hydroxyl groups in one molecule as functional groups, the following [Example 1] to [Example 3] can be used. [Example 1] Polyester polyol obtained by polycondensation of ortho-oriented polycarboxylic acid or its anhydride with polyhydric alcohol [Example 2] Polyester polyol with a glycerol skeleton [Example 3] Polyester polyol with isocyanuric ring Each polyester polyol will be described below.

[0038] The polyester polyol according to the first example is a polycondensate obtained by polycondensing a polycarboxylic acid component containing at least one or more of orthophthalic acid and its anhydride, and a polyhydric alcohol component containing at least one selected from the group consisting of ethylene glycol, propylene glycol, butylene glycol, neopentyl glycol, and cyclohexanedimethanol. In particular, polyester polyols in which the content of orthophthalic acid and its anhydride relative to the total amount of polycarboxylic acid components is 70 to 100 mass % are preferred.

[0039] The polyester polyol according to the first example essentially contains orthophthalic acid and its anhydride as polycarboxylic acid components, but other polycarboxylic acid components may be copolymerized within a range that does not impair the effects of this embodiment. Specific examples include aliphatic polycarboxylic acids such as succinic acid, adipic acid, azelaic acid, sebacic acid, and dodecanedicarboxylic acid, unsaturated bond-containing polycarboxylic acids such as maleic anhydride, maleic acid, and fumaric acid, alicyclic polycarboxylic acids such as 1,3-cyclopentanedicarboxylic acid and 1,4-cyclohexanedicarboxylic acid, aromatic polycarboxylic acids such as terephthalic acid, isophthalic acid, pyromellitic acid, trimellitic acid, 1,4-naphthalenedicarboxylic acid, 2,5-naphthalenedicarboxylic acid, 2,6-naphthalenedicarboxylic acid, naphthalic acid, biphenyldicarboxylic acid, 1,2-bis(phenoxy)ethane-p,p'-dicarboxylic acid, anhydrides of these dicarboxylic acids, and ester-forming derivatives of these dicarboxylic acids, and polybasic acids such as p-hydroxybenzoic acid, p-(2-hydroxyethoxy)benzoic acid, and ester-forming derivatives of these dihydroxycarboxylic acids. Among these, succinic acid, 1,3-cyclopentanedicarboxylic acid, and isophthalic acid are preferred. Two or more of the above other polycarboxylic acids may be used.

[0040] As a polyester polyol according to a second example, a polyester polyol having a glycerol skeleton represented by general formula (1) can be mentioned. [ka] In general formula (1), R1, R2, and R3 are each independently H (hydrogen atom) or a group represented by the following general formula (2). [ka]

[0041] In formula (2), n represents an integer of 1 to 5, X represents an arylene group selected from the group consisting of 1,2-phenylene groups, 1,2-naphthylene groups, 2,3-naphthylene groups, 2,3-anthraquinonediyl groups, and 2,3-anthracenediyl groups, which may have a substituent, and Y represents an alkylene group having 2 to 6 carbon atoms. However, at least one of R1, R2, and R3 represents a group represented by general formula (2).

[0042] In general formula (1), at least one of R1, R2, and R3 must be a group represented by general formula (2). In particular, it is preferable that all of R1, R2, and R3 are groups represented by general formula (2).

[0043] In addition, the compound may be a mixture of two or more of the following compounds: a compound in which any one of R1, R2, and R3 is a group represented by general formula (2); a compound in which any two of R1, R2, and R3 are groups represented by general formula (2); and a compound in which all of R1, R2, and R3 are groups represented by general formula (2).

[0044] X represents an arylene group selected from the group consisting of a 1,2-phenylene group, a 1,2-naphthylene group, a 2,3-naphthylene group, a 2,3-anthraquinonediyl group, and a 2,3-anthracenediyl group, which may have a substituent. When X is substituted with a substituent, it may be substituted with one or more substituents, and the substituent is bonded to any carbon atom on X that is different from the free radical. Examples of the substituent include a chloro group, a bromo group, a methyl group, an ethyl group, an i-propyl group, a hydroxyl group, a methoxy group, an ethoxy group, a phenoxy group, a methylthio group, a phenylthio group, a cyano group, a nitro group, an amino group, a phthalimido group, a carboxyl group, a carbamoyl group, an N-ethylcarbamoyl group, a phenyl group, and a naphthyl group.

[0045] In general formula (2), Y represents an alkylene group having 2 to 6 carbon atoms, such as an ethylene group, a propylene group, a butylene group, a neopentylene group, a 1,5-pentylene group, a 3-methyl-1,5-pentylene group, a 1,6-hexylene group, a methylpentylene group, or a dimethylbutylene group. Of these, a propylene group or an ethylene group is preferred, and an ethylene group is most preferred.

[0046] The polyester resin compound having a glycerol skeleton represented by general formula (1) can be synthesized by reacting glycerol with an aromatic polycarboxylic acid or an anhydride thereof in which a carboxylic acid is substituted at the ortho position, and a polyhydric alcohol component as essential components.

[0047] Examples of aromatic polycarboxylic acids or anhydrides thereof in which a carboxylic acid is substituted at the ortho position include orthophthalic acid or anhydride thereof, naphthalene 2,3-dicarboxylic acid or anhydride thereof, naphthalene 1,2-dicarboxylic acid or anhydride thereof, anthraquinone 2,3-dicarboxylic acid or anhydride thereof, and 2,3-anthracenecarboxylic acid or anhydride thereof. These compounds may have a substituent on any carbon atom of the aromatic ring, such as a chloro group, a bromo group, a methyl group, an ethyl group, an i-propyl group, a hydroxyl group, a methoxy group, an ethoxy group, a phenoxy group, a methylthio group, a phenylthio group, a cyano group, a nitro group, an amino group, a phthalimido group, a carboxyl group, a carbamoyl group, an N-ethylcarbamoyl group, a phenyl group, or a naphthyl group.

[0048] Furthermore, examples of the polyhydric alcohol component include alkylene diols having 2 to 6 carbon atoms, such as ethylene glycol, propylene glycol, butylene glycol, neopentyl glycol, 1,5-pentanediol, 3-methyl-1,5-pentanediol, 1,6-hexanediol, methylpentanediol, and dimethylbutanediol.

[0049] The polyester polyol according to the third example is a polyester polyol having an isocyanuric ring represented by the following general formula (3). [ka] In the general formula (3), R1, R2, and R3 each independently represent "-(CH2)n1-OH (wherein n1 represents an integer of 2 to 4)" or a structure of the general formula (4). [ka]

[0050] In general formula (4), n2 represents an integer of 2 to 4, n3 represents an integer of 1 to 5, X represents an arylene group selected from the group consisting of a 1,2-phenylene group, a 1,2-naphthylene group, a 2,3-naphthylene group, a 2,3-anthraquinonediyl group, and a 2,3-anthracenediyl group, which may have a substituent, and Y represents an alkylene group having 2 to 6 carbon atoms, provided that at least one of R1, R2, and R3 is a group represented by general formula (4).

[0051] In the general formula (3), the alkylene group represented by -(CH2)n1- may be linear or branched. Among these, n1 is preferably 2 or 3, and most preferably 2.

[0052] In the general formula (4), n2 represents an integer of 2 to 4, and n3 represents an integer of 1 to 5. X represents an arylene group selected from the group consisting of a 1,2-phenylene group, a 1,2-naphthylene group, a 2,3-naphthylene group, a 2,3-anthraquinonediyl group, and a 2,3-anthracenediyl group, which may have a substituent.

[0053] When X is substituted with a substituent, it may be substituted with one or more substituents, and the substituent is bonded to any carbon atom on X that is different from the free radical. Examples of the substituent include a chloro group, a bromo group, a methyl group, an ethyl group, an i-propyl group, a hydroxyl group, a methoxy group, an ethoxy group, a phenoxy group, a methylthio group, a phenylthio group, a cyano group, a nitro group, an amino group, a phthalimido group, a carboxyl group, a carbamoyl group, an N-ethylcarbamoyl group, a phenyl group, and a naphthyl group. The substituent for X is preferably a hydroxyl group, a cyano group, a nitro group, an amino group, a phthalimido group, a carbamoyl group, an N-ethylcarbamoyl group, or a phenyl group, and most preferably a hydroxyl group, a phenoxy group, a cyano group, a nitro group, a phthalimido group, or a phenyl group.

[0054] In general formula (4), Y represents an alkylene group having 2 to 6 carbon atoms, such as an ethylene group, a propylene group, a butylene group, a neopentylene group, a 1,5-pentylene group, a 3-methyl-1,5-pentylene group, a 1,6-hexylene group, a methylpentylene group, or a dimethylbutylene group. Of these, a propylene group or an ethylene group is preferred, and an ethylene group is most preferred.

[0055] In general formula (3), at least one of R1, R2, and R3 is a group represented by general formula (4). In particular, it is preferable that all of R1, R2, and R3 are groups represented by general formula (4).

[0056] In addition, the compound may be a mixture of two or more of the following compounds: a compound in which any one of R1, R2, and R3 is a group represented by general formula (4); a compound in which any two of R1, R2, and R3 are groups represented by general formula (4); and a compound in which all of R1, R2, and R3 are groups represented by general formula (4).

[0057] The polyester polyol having an isocyanuric ring represented by general formula (3) can be synthesized by reacting a triol having an isocyanuric ring, an aromatic polycarboxylic acid or an anhydride thereof in which a carboxylic acid is substituted at the ortho position, and a polyhydric alcohol component as essential components.

[0058] Examples of triols having an isocyanuric ring include alkylene oxide adducts of isocyanuric acid such as 1,3,5-tris(2-hydroxyethyl)isocyanuric acid and 1,3,5-tris(2-hydroxypropyl)isocyanuric acid.

[0059] Examples of aromatic polycarboxylic acids or anhydrides thereof in which a carboxylic acid is substituted at the ortho position include orthophthalic acid or anhydride, naphthalene 2,3-dicarboxylic acid or anhydride, naphthalene 1,2-dicarboxylic acid or anhydride, anthraquinone 2,3-dicarboxylic acid or anhydride, and 2,3-anthracene carboxylic acid or anhydride, etc. These compounds may have a substituent on any carbon atom of the aromatic ring.

[0060] Examples of the substituent include a chloro group, a bromo group, a methyl group, an ethyl group, an i-propyl group, a hydroxyl group, a methoxy group, an ethoxy group, a phenoxy group, a methylthio group, a phenylthio group, a cyano group, a nitro group, an amino group, a phthalimido group, a carboxyl group, a carbamoyl group, an N-ethylcarbamoyl group, a phenyl group, and a naphthyl group.

[0061] The polyhydric alcohol component may be an alkylene diol having 2 to 6 carbon atoms, such as ethylene glycol, propylene glycol, butylene glycol, neopentyl glycol, 1,5-pentanediol, 3-methyl-1,5-pentanediol, 1,6-hexanediol, methylpentanediol, or dimethylbutanediol. Among these, polyester polyol compounds having an isocyanuric ring, which use 1,3,5-tris(2-hydroxyethyl)isocyanuric acid or 1,3,5-tris(2-hydroxypropyl)isocyanuric acid as the triol compound having an isocyanuric ring, orthophthalic anhydride as the aromatic polycarboxylic acid or its anhydride in which the carboxylic acid is substituted at the ortho position, and ethylene glycol as the polyhydric alcohol, are particularly preferred because of their excellent oxygen barrier properties and adhesiveness.

[0062] The isocyanuric ring is highly polar and trifunctional, and can increase the polarity of the entire system and the crosslink density. From these perspectives, it is preferable that the adhesive resin contains 5% by mass or more of the isocyanuric ring based on the total solid content of the adhesive resin.

[0063] The oxidation resistance of the polyester polyol is preferably 20 mgKOH / g or more, and more preferably 50 mgKOH / g or more, which allows the oxygen barrier property and water vapor barrier property of the laminate to be better maintained.

[0064] The isocyanate compound has two or more isocyanate groups in the molecule. The isocyanate compound may be either aromatic or aliphatic, and may be either a low molecular weight compound or a high molecular weight compound. Furthermore, the isocyanate compound may be a blocked isocyanate compound obtained by addition reaction using a known isocyanate blocking agent by a known, conventional appropriate method. Among these, from the viewpoints of adhesiveness and retort resistance, polyisocyanate compounds having three or more isocyanate groups are preferred, and from the viewpoints of oxygen barrier property and water vapor barrier property, aromatic compounds are preferred.

[0065] Specific examples of the isocyanate compound include tetramethylene diisocyanate, hexamethylene diisocyanate, toluene diisocyanate, diphenylmethane diisocyanate, hydrogenated diphenylmethane diisocyanate, metaxylylene diisocyanate, hydrogenated xylylene diisocyanate, isophorone diisocyanate, and trimers of these isocyanate compounds, as well as adducts, biurets, and allophanates obtained by reacting these isocyanate compounds with low-molecular-weight active hydrogen compounds or alkylene oxide adducts thereof, or high-molecular-weight active hydrogen compounds. Examples of low molecular weight active hydrogen compounds include ethylene glycol, propylene glycol, metaxylylene alcohol, 1,3-bishydroxyethylbenzene, 1,4-bishydroxyethylbenzene, trimethylolpropane, glycerol, pentaerythritol, erythritol, sorbitol, ethylenediamine, monoethanolamine, diethanolamine, triethanolamine, and metaxylylenediamine. Examples of molecular weight active hydrogen compounds include polymeric active hydrogen compounds of various polyester resins, polyether polyols, and polyamides.

[0066] The two-component curing adhesive used to form the adhesive layer may contain a phosphate-modified compound, which can better maintain the oxygen barrier property and water vapor barrier property of the laminate. The phosphoric acid-modified compound is, for example, a compound represented by the following general formula (5) or (6). [ka] In general formula (5), R1, R2, and R3 are groups selected from a hydrogen atom, an alkyl group having 1 to 30 carbon atoms, a (meth)acryloyl group, a phenyl group which may have a substituent, and an alkyl group having 1 to 4 carbon atoms which has a (meth)acryloyloxy group, at least one of which is a hydrogen atom, and n is an integer of 1 to 4. [ka] In the formula, R4 and R5 are groups selected from a hydrogen atom, an alkyl group having 1 to 30 carbon atoms, a (meth)acryloyl group, a phenyl group which may have a substituent, and an alkyl group having 1 to 4 carbon atoms which has a (meth)acryloyloxy group; n is an integer of 1 to 4, x is an integer of 0 to 30, and y is an integer of 0 to 30, except when both x and y are 0.

[0067] More specific examples include phosphoric acid, pyrophosphoric acid, triphosphoric acid, methyl acid phosphate, ethyl acid phosphate, butyl acid phosphate, dibutyl phosphate, 2-ethylhexyl acid phosphate, bis(2-ethylhexyl) phosphate, isododecyl acid phosphate, butoxyethyl acid phosphate, oleyl acid phosphate, tetracosyl acid phosphate, 2-hydroxyethyl methacrylate acid phosphate, and polyoxyethylene alkyl ether phosphate, and one or more of these can be used.

[0068] The content of the phosphate-modified compound in the two-component curing adhesive is preferably 0.005% by mass to 10% by mass, and more preferably 0.01% by mass to 1% by mass. By keeping the content of the phosphate-modified compound within this range, the oxygen barrier property and water vapor barrier property of the laminate can be further maintained.

[0069] The two-component curing adhesive used to form the adhesive layer preferably contains a plate-like inorganic compound, which allows the oxygen barrier property and water vapor barrier property of the laminate to be better maintained. Examples of the plate-like inorganic compounds include kaolinite-serpentine group clay minerals (halloysite, kaolinite, endelite, dickite, nacrite, antigorite, chrysotile, etc.) and pyrophyllite-talc group clay minerals (pyrophyllite, talc, keroli, etc.).

[0070] The two-component curing adhesive used to form the adhesive layer may contain a coupling agent, which can better maintain the oxygen barrier property and water vapor barrier property of the laminate. Examples of the coupling agent include a silane-based coupling agent, a titanium-based coupling agent, or an aluminum-based coupling agent represented by the following general formula (7): These coupling agents may be used alone or in combination of two or more. [ka]

[0071] Examples of silane coupling agents include vinyltrichlorosilane, vinyltrimethoxysilane, vinyltriethoxysilane, β-(3,4-epoxycyclohexyl)ethyltrimethoxysilane, γ-glycidoxypropyltrimethoxysilane, γ-glycidoxypropylmethyldiethoxysilane, γ-glycidoxypropyltriethoxysilane, γ-methacryloxytrimethoxysilane, γ-methacryloxypropylmethyldimethoxysilane, γ-methacryloxypropyltrimethoxysilane, γ-methacryloxypropylmethyldiethoxysilane, γ-methacryloxypropyltriethoxysilane, N-β (aminoethyl)γ-aminopropylmethyldimethoxysilane, N-β(aminoethyl)γ-aminopropyltrimethoxysilane, N-β(aminoethyl)γ-aminopropyltriethoxysilane, γ-aminopropyltrimethoxysilane, γ-aminopropyltriethoxysilane, N-phenyl-γ-aminopropyltrimethoxysilane, γ-chloropropyltrimethoxysilane, γ-mercaptopropyltrimethoxysilane, 3-isocyanatepropyltriethoxysilane, 3-acryloxypropyltrimethoxysilane, and 3-triethoxysilyl-N-(1,3-dimethylbutylidene).

[0072] Examples of titanium-based coupling agents include isopropyl triisostearoyl titanate, isopropyl tri(N-aminoethyl-aminoethyl) titanate, isopropyl tridodecylbenzenesulfonyl titanate, isopropyl tris(dioctyl pyrophosphate) titanate, tetraoctyl bis(didodecyl phosphite) titanate, tetraoctyl bis(ditridecyl phosphite) titanate, bis(dioctyl pyrophosphate)oxyacetate titanate, bis(dioctyl pyrophosphate)ethylene titanate, isopropyl trioctainol titanate, isopropyl dimethacryl isostearoyl titanate, isopropyl isostearoyl diacryl titanate, diisostearoyl ethylene titanate, isopropyl tri(dioctyl phosphate) titanate, isopropyl tricumyl phenyl titanate, and dicumyl phenyl oxyacetate titanate.

[0073] Specific examples of aluminum-based coupling agents include acetoalkoxyaluminum diisopropylate, diisopropoxyaluminum ethyl acetoacetate, diisopropoxyaluminum monomethacrylate, isopropoxyaluminum alkyl acetoacetate mono(dioctyl phosphate), aluminum-2-ethylhexanoate oxide trimer, aluminum stearate oxide trimer, and alkyl acetoacetate aluminum oxide trimer.

[0074] The two-component curing adhesive used to form the adhesive layer preferably contains cyclodextrin and / or a derivative thereof, which allows the oxygen barrier property and water vapor barrier property of the laminate to be better maintained. Specifically, for example, cyclodextrin, alkylated cyclodextrin, acetylated cyclodextrin, hydroxyalkylated cyclodextrin, and the like, in which the hydrogen atoms of the hydroxyl groups of the glucose units of cyclodextrin are substituted with other functional groups, can be used. Branched cyclic dextrins can also be used. Furthermore, the cyclodextrin skeleton in cyclodextrin and cyclodextrin derivatives may be any of α-cyclodextrin consisting of six glucose units, β-cyclodextrin consisting of seven glucose units, and γ-cyclodextrin consisting of eight glucose units. These compounds may be used alone or in combination of two or more. Hereinafter, these cyclodextrins and / or their derivatives may be collectively referred to as dextrin compounds.

[0075] From the viewpoint of compatibility and dispersibility in the resin composition, it is preferable to use a cyclodextrin derivative as the cyclodextrin compound. From the viewpoint of the polarity of the various resins, the degree of substitution is preferably in the range of 0.1 to 14 per glucose, and more preferably in the range of 0.3 to 8 per glucose.

[0076] Examples of alkylated cyclodextrins include methyl-α-cyclodextrin, methyl-β-cyclodextrin, and methyl-γ-cyclodextrin, etc. These compounds may be used alone or in combination of two or more.

[0077] Examples of acetylated cyclodextrins include monoacetyl-α-cyclodextrin, monoacetyl-β-cyclodextrin, monoacetyl-γ-cyclodextrin, etc. These compounds may be used alone or in combination of two or more.

[0078] Examples of hydroxyalkylated cyclodextrins include hydroxypropyl-α-cyclodextrin, hydroxypropyl-β-cyclodextrin, and hydroxypropyl-γ-cyclodextrin, etc. These compounds may be used alone or in combination of two or more.

[0079] The thickness of the adhesive layer is preferably from 0.5 μm to 6 μm, more preferably from 0.8 μm to 5 μm, and even more preferably from 1 μm to 4.5 μm, which allows the oxygen barrier property and water vapor barrier property to be better maintained.

[0080] The adhesive layer can be formed by applying the adhesive to a substrate or the like and drying it using a conventionally known method such as direct gravure roll coating, gravure roll coating, kiss coating, reverse roll coating, Fontaine method, and transfer roll coating.

[0081] (sealant layer) The sealant layer contains polypropylene. The polypropylene may be the same as that used for the substrate. The sealant layer may be formed from an unstretched resin film or by melt extrusion of polypropylene.

[0082] The sealant layer is preferably subjected to the above-mentioned surface treatment.

[0083] The sealant layer may contain the above-mentioned additives as long as the properties of the present invention are not impaired.

[0084] The thickness of the sealant layer is preferably 5 μm or more and 120 μm or less, and more preferably 10 μm or more and 100 μm or less. This makes it possible to suppress deformation of the laminate due to heat sealing. It also makes it possible to improve the mechanical strength and processability. Furthermore, it makes it possible to improve the processability and puncture resistance of the laminate while maintaining the heat sealability of the sealant layer.

[0085] (evaporated film) The laminate further includes a vapor-deposited film between the substrate and the adhesive layer or between the adhesive layer and the sealant layer, thereby providing the laminate with oxygen barrier properties and water vapor barrier properties.

[0086] Examples of the vapor-deposited film include vapor-deposited films containing metals such as aluminum, and inorganic oxides such as aluminum oxide, silicon oxide, magnesium oxide, calcium oxide, zirconium oxide, titanium oxide, boron oxide, hafnium oxide, and barium oxide. Among these, aluminum vapor deposition films are preferred from the viewpoint of oxygen barrier properties and water vapor barrier properties.

[0087] As a method for forming a vapor-deposited film, a conventionally known method can be used, 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.

[0088] The thickness of the vapor-deposited film is preferably 1 nm or more and 140 nm or less, more preferably 5 nm or more and 60 nm or less, and even more preferably 5 nm or more and 40 nm or less. By keeping the thickness of the vapor-deposited film within the above numerical range, the occurrence of cracks and the like in the vapor-deposited film can be prevented. When the vapor-deposited film is an aluminum vapor-deposited film, the film thickness is preferably 1 nm or more and 100 nm or less, more preferably 5 nm or more and 60 nm or less, and even more preferably 10 nm or more and 40 nm or less. When the vapor-deposited film is a silicon oxide or aluminum oxide vapor-deposited film, the film thickness is preferably 1 nm or more and 140 nm or less, more preferably 5 nm or more and 30 nm or less, and even more preferably 5 nm or more and 20 nm or less.

[0089] Also, for example, a composite film consisting of two or more layers of vapor-deposited films of different inorganic oxides can be formed and used by combining physical vapor deposition and chemical vapor deposition. The degree of vacuum in the deposition chamber is 10 -2 ~10 -8 After oxygen is introduced, the pressure is preferably about 10 -1 ~10 -6A pressure of about mbar is preferred. The amount of oxygen introduced varies depending on the size of the deposition machine. An inert gas such as argon gas, helium gas, or nitrogen gas may be used as a carrier gas for the oxygen introduced, provided that this does not cause any problems. The film transport speed is preferably about 10 to 800 m / min, and particularly about 50 to 600 m / min.

[0090] (gas barrier layer) The laminate may have a gas barrier layer between any layers, for example, between the adhesive layer and the vapor-deposited film, which can improve the oxygen barrier property and water vapor barrier property of the laminate.

[0091] In one embodiment, the gas barrier layer comprises at least one resin composition, such as a hydrolyzate of a metal alkoxide or a hydrolyzed condensate of a metal alkoxide, obtained by polycondensing a mixture of a metal alkoxide and a water-soluble polymer by a sol-gel method in the presence of a sol-gel catalyst, water, an organic solvent, etc.

[0092] In one embodiment, the metal alkoxide is represented by the following general formula: R 1 n M(OR 2 ) m (wherein, R 1 , R 2 each 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 valence of M.

[0093] As the metal atom M, for example, silicon, zirconium, titanium, aluminum, etc. can be used. Also, R 1 and R 2 Examples of the organic group represented by the formula (I) include alkyl groups such as a methyl group, an ethyl group, an n-propyl group, an i-propyl group, an n-butyl group, and an i-butyl group.

[0094] Examples of metal alkoxides that satisfy the above general formula include tetramethoxysilane (Si(OCH3)4), tetraethoxysilane (mass %) Si(OC2H5)4), tetrapropoxysilane (Si(OC3H7)4), and tetrabutoxysilane (Si(OC4H9)4).

[0095] It is also preferable to use a silane coupling agent together with the metal alkoxide. As the silane coupling agent, known organoalkoxysilanes containing organic reactive groups can be used, but organoalkoxysilanes having epoxy groups are particularly preferred. Examples of organoalkoxysilanes having epoxy groups include γ-glycidoxypropyltrimethoxysilane, γ-glycidoxypropylmethyldiethoxysilane, and β-(3,4-epoxycyclohexyl)ethyltrimethoxysilane.

[0096] Two or more of the above silane coupling agents may be used, and the silane coupling agent is preferably used in an amount of about 1 to 20 parts by mass per 100 parts by mass of the total amount of the alkoxides.

[0097] As the water-soluble polymer, polyvinyl alcohol and ethylene-vinyl alcohol copolymer are preferred, and from the viewpoints of oxygen barrier property, water vapor barrier property, water resistance and weather resistance, it is preferred to use these in combination.

[0098] The content of the water-soluble polymer in the gas barrier layer is preferably 5 to 500 parts by mass per 100 parts by mass of the metal alkoxide, which can further improve the oxygen barrier property, water vapor barrier property, and strength of the gas barrier layer.

[0099] The thickness of the gas barrier layer is preferably from 0.01 μm to 100 μm, and more preferably from 0.1 μm to 50 μm, which effectively prevents cracks from occurring in the gas barrier layer while further improving its oxygen barrier property and water vapor barrier property.

[0100] The gas barrier layer can be formed by applying a composition containing the upper material onto a substrate by a conventionally known means such as roll coating using a gravure roll coater or the like, spray coating, spin coating, dipping, brush coating, bar coating, applicator or the like, and then polycondensing the composition by a sol-gel method. The sol-gel catalyst is preferably an acid or an amine compound. As the amine compound, a tertiary amine that is substantially insoluble in water and soluble in an organic solvent is preferred, such as N,N-dimethylbenzylamine, tripropylamine, tributylamine, tripentylamine, etc. Among these, N,N-dimethylbenzylamine is preferred. The sol-gel catalyst is preferably used in an amount of 0.01 to 1.0 part by mass, more preferably 0.03 to 0.3 part by mass, per 100 parts by mass of the metal alkoxide, which allows the gas barrier layer to be formed with a uniform thickness and further improves the catalytic effect.

[0101] The composition may further contain an acid, which is used as a catalyst in the sol-gel process, mainly for the hydrolysis of alkoxides, silane coupling agents, and the like. Examples of acids that can be used include mineral acids such as sulfuric acid, hydrochloric acid, and nitric acid, as well as organic acids such as acetic acid and tartaric acid. The amount of acid used is preferably 0.001 to 0.05 moles relative to the total molar amount of the alkoxide and the alkoxide portion (e.g., silicate portion) of the silane coupling agent. This allows the formed gas barrier layer to have a uniform thickness and further improves the catalytic effect.

[0102] The composition preferably contains water in an amount of 0.1 to 100 moles, more preferably 0.8 to 2 moles, per mole of the total molar amount of alkoxides, which can improve the oxygen barrier property and water vapor barrier property of the gas barrier layer and also enable the hydrolysis reaction to proceed quickly.

[0103] The composition may also contain an organic solvent, such as methyl alcohol, ethyl alcohol, n-propyl alcohol, isopropyl alcohol, or n-butanol.

[0104] An embodiment of the method for forming the gas barrier layer will be described below. First, a composition is prepared by mixing a metal alkoxide, a water-soluble polymer, a sol-gel catalyst, water, an organic solvent, and optionally a silane coupling agent, etc. A polycondensation reaction gradually proceeds in the composition. Next, the composition is applied onto the vapor-deposited film by the above-mentioned conventionally known method and dried. This drying further promotes the polycondensation reaction of the alkoxide and the water-soluble polymer (and the silane coupling agent if the composition contains one), forming a composite polymer layer. Finally, the composition is heated at a temperature of 20 to 250°C, preferably 50 to 220°C, for 1 second to 10 minutes to form a gas barrier layer.

[0105] (Method of manufacturing laminate) The method for producing the laminate of the present invention is not particularly limited, and it can be produced by a conventionally known method such as melt extrusion lamination, dry lamination, or sand lamination.

[0106] The laminate of the present invention can also be subjected to secondary processing for the purpose of imparting surface functions such as chemical functions, electrical functions, magnetic functions, mechanical functions, friction / wear / lubrication functions, optical functions, thermal functions, and biocompatibility. Examples of secondary processing include embossing, painting, bonding, printing, metallizing (plating, etc.), machining, and surface treatments (antistatic treatment, corona discharge treatment, plasma treatment, photochromism treatment, physical vapor deposition, chemical vapor deposition, coating, etc.). Furthermore, the laminate of the present invention can also be subjected to lamination (dry lamination or extrusion lamination), bag-making, and other post-processing to produce molded products.

[0107] (packaging bag) The packaging bag of the present invention comprises the laminate and a zipper tape, the zipper tape being positioned on the sealant layer. The substrate and zipper tape of the packaging bag contain the same resin material, which is polypropylene. This improves recyclability. The zipper tape may contain the same polypropylene as the substrate. An example of the packaging bag of the present invention will be described with reference to the drawings.

[0108] Fig. 2 is a front view showing an example of the packaging bag of the present invention. The flat bag 20 shown in Fig. 2 comprises body material films 21, 21' (using the above laminate) and zipper tape 23, and has a through-hole 22 at the top of the flat bag 20. The zipper tape is a member provided to reseal the packaging bag after it has been opened.

[0109] FIG. 3 is a cross-sectional view of the packaging bag 20 shown in FIG. 2 as viewed along line AA. As shown in FIG. 3, the zipper tape 23 includes a male tape 24 attached to the inner surface of the body material film 21 and a female tape 25 attached to the inner surface of the body material film 21' so as to face the male tape 24. The male tape 24 and the female tape 25 are configured to be interlockable with each other. In this case, by interlocking the male tape 24 with the female tape 25, the packaging bag 20 can be resealed after opening. Furthermore, by disengaging the male tape 24 from the female tape 25, the contents can be removed again. Although not shown, the male tape 24 may be attached to the body material film 21' and the female tape 25 may be attached to the body material film 21.

[0110] Next, a method for manufacturing the flat bag 20 will be described with reference to FIG. First, the body material films 21, 21' are prepared and positioned so that the sealant layers of the body material films 21, 21' face each other. Next, the zipper tape 23 is inserted between the body material films 21, 21' toward the top, and each of the body material films 21, 21' and the zipper tape 23 are heat-sealed. Next, the bottom of the body material films 21, 21' is heat-sealed. A point seal bar is used to crush the protrusions of the male tape 24 and female tape 25 of the zipper tape 23 located in the heat-sealed portions on both sides of the body material films 21, 21'. Next, a side seal bar is used to heat-seal the heat-sealed portions on both sides of the body material films 21, 21'. Next, the male tape 24 is removed from the female tape 25 of the zipper tape 23 to open the bag, and contents are filled through the opening at the top. Next, the male tape 24 and female tape 25 are re-engaged to close the opening, and the top of the body material films 21, 21' is heat-sealed. Finally, the through holes 22 are formed to complete the flat bag 20. Here, the hatched areas in Fig. 2 represent the heat-sealed areas. Alternatively, the flat bag 20 may be manufactured by first heat-sealing the upper portions of the body material films 21, 21', filling the contents, and then heat-sealing the lower portions of the body material films 21, 21'.

[0111] Figures 4 and 5 are front and back perspective views showing another example of the packaging bag of the present invention. Pillow bag 30 shown in Figures 4 and 5 includes body material film 31 (using the above laminate) and zipper tape 33, and has a through-hole 32 at the top of pillow bag 30. Zipper tape 33 can be the same as zipper tape 23 described in Figures 2 and 3.

[0112] Next, a method for manufacturing the pillow bag 30 will be described with reference to FIGS. First, the body material film 31 is prepared, and the zipper tape 33 is heat-sealed near the upper center of the sealant layer of the body material film 31. Next, the left and right ends of the body material film 31 are folded toward the center so that the zipper tape 33 is positioned on the inside, and the sealant layers are heat-sealed together. Next, the inner surface of the folded portion of the tubular body material film 31 is heat-sealed to the zipper tape 33. Next, the bottom of the body material film 31 is heat-sealed. Next, the male tape of the zipper tape 33 is removed from the female tape to open the bag, and contents are filled through the top opening. Next, the male tape and female tape are re-engaged to seal the opening, and the top of the body material film 31 is heat-sealed. Finally, a through-hole 32 is formed, completing the pillow bag 30. The shaded areas in Figures 4 and 5 indicate the heat-sealed areas. Alternatively, the pillow bag 30 may be manufactured by first heat-sealing the upper part of the body material film 31, filling the contents, and then heat-sealing the lower part of the body material film 31.

[0113] Fig. 6 is a front view showing another example of the packaging bag of the present invention. Stand pouch 40 shown in Fig. 6 comprises body material films (using the above-mentioned laminate) 41, 41', a base material film (which may be the same as or different from the body material film) 44, and zipper tape 43, and has through-hole 32 at the top of stand pouch 40. The zipper tape 43 may be the same as zipper tape 23 described in Figs. 2 and 3.

[0114] Next, a method for manufacturing the stand pouch 40 will be described with reference to FIG. First, body material films 41 and 41' are prepared and positioned so that the sealant layers of the body material films 41 and 41' face each other. Next, a bottom material film 44 is folded inward and inserted between the lower parts of the body material films 41 and 41' to form a gusset, and the lower part of the boat-bottom shape, including the peripheral portion, is heat-sealed. Next, a bottom material film 42 is folded inward and inserted between the lower parts of the body material films 41 and 41' to form a gusset, and the body material films 41 and 41' are heat-sealed to the bottom material film 42 using a boat-bottom-shaped heat-sealing hot plate. A point seal bar is used to crush the protrusions of the male and female tapes of the zipper tape 43 located in the heat-sealed portions on both sides of the body material films 41 and 41'. Next, a side seal bar is used to heat-seal the heat-sealed portions on both sides of the body material films 41 and 41'. Next, the male tape of the zipper tape 43 is removed from the female tape, opening the bag, and contents are filled through the opening at the top. Next, the male tape and female tape are re-engaged to close the opening, and the tops of the body material films 41, 41' are heat-sealed. Finally, a through hole 42 is formed to produce the stand-up pouch 40. Here, the shaded area in Figure 6 indicates the heat-sealed area. Alternatively, the stand pouch 40 may be manufactured by first heat-sealing the top of the body material film 41, filling the contents, and then heat-sealing the bottom of the body material film 31 and the base material film 44 together.

[0115] The contents to be filled into the packaging bag are not particularly limited, and the contents may be solids, liquids, powders, or gels. The contents may also be food or non-food.

[0116] (Other aspects) Another aspect of the present invention is a coating composition comprising a substrate, an adhesive layer, and a sealant layer, and further comprising a vapor-deposited film between the adhesive layer and the sealant layer, wherein the adhesive layer is a cured product of a two-component curing adhesive containing a polyester polyol and an isocyanate compound, and the polyester polyol is a polyester polyol obtained by polycondensing an ortho-oriented polycarboxylic acid or an anhydride thereof with a polyhydric alcohol, a polyester polyol having a glycerol skeleton, or a polyester polyol having an isocyanuric ring, The laminate is characterized in that the substrate is a stretched resin film, the substrate and the sealant layer contain the same resin material, and the same resin material is polypropylene. In the laminate according to another aspect of the present invention, the sealant layer may be an unstretched resin film. In the laminate according to another aspect of the present invention, the content of the same resin material may be 90% by mass or more. In the laminate according to another aspect of the present invention, the thickness of the laminate may be 10 μm or more and 130 μm or less. In the laminate according to another aspect of the present invention, the adhesive layer may have a thickness of 0.5 μm or more and 6 μm or less. In the laminate according to another aspect of the present invention, the vapor-deposited film may have a thickness of 1 nm or more and 140 nm or less. In the laminate according to another aspect of the present invention, the vapor-deposited film may be an aluminum vapor-deposited film. Another aspect of the present invention is a packaging bag comprising the above-described laminate and a zipper tape, wherein the zipper tape is located on the sealant layer, and the substrate, the sealant layer, and the zipper tape contain the same resin material, which is polypropylene. [Example]

[0117] The present invention will now be described in more detail with reference to examples, but the present invention is not limited to these examples.

[0118] [Example 1] A biaxially oriented polypropylene resin film having a thickness of 30 μm was prepared as a substrate, and a printing layer having a thickness of 1 μm was formed on the biaxially oriented polypropylene resin film by gravure printing.

[0119] Next, an unstretched polypropylene resin film (manufactured by Toray Processing Films Co., Ltd., trade name: VM-CPP 2703, thickness: 30 μm) with a 50 nm thick aluminum vapor deposition film on one side was prepared, and the printed side of the biaxially stretched polypropylene resin film and the vapor deposition side of the unstretched polypropylene resin film were laminated via a two-component curing adhesive containing polyester polyol and an isocyanate compound (manufactured by DIC Corporation, trade name: PASLIM VM NSRD011 / NSRD006). The thickness of the adhesive layer formed by the two-component curing adhesive was 2.5 μm.

[0120] The thickness of the laminate thus obtained was 63.5 μm and the weight was 57.5 g / m 2 The proportion of polypropylene in the laminate was 93.9% by mass.

[0121] Next, using the laminate obtained in this example and a zipper tape containing polypropylene (manufactured by Takiron C.I. Co., Ltd., product name: Zipper Tape MX-13F, MX general-purpose grade), a flat bag 20 as shown in Fig. 2 was produced (processing conditions: sealing temperature 175°C, sealing time 0.30 seconds). The body material film (laminate) was not deformed by heat sealing.

[0122] [Example 2] A laminate was produced in the same manner as in Example 1.

[0123] Next, using the laminate obtained in this example and a zipper tape containing polypropylene (manufactured by Takiron C.I. Co., Ltd., product name: Zipper Tape MX-13FS, MX soft grade), a flat bag 20 as shown in Fig. 2 was produced (processing conditions: sealing temperature 175°C, sealing time 0.30 seconds). The body material film (laminate) was not deformed by heat sealing.

[0124] [Comparative Example 1] A polyethylene terephthalate (PET) resin film with a thickness of 12 μm was prepared as a substrate, and a printing layer with a thickness of 1 μm was formed on the PET resin film by gravure printing.

[0125] Next, a 7 μm thick aluminum foil was prepared, and the printed layer of PET resin film and the aluminum foil were laminated via a two-component curing adhesive (manufactured by Rock Paint Co., Ltd., product name: Adlock, main agent: RU-77T, curing agent: H-7). The thickness of the adhesive layer formed by the two-component curing adhesive was 3 μm.

[0126] Next, a 60 μm thick polyethylene resin film was prepared, and the aluminum foil and the polyethylene resin film were laminated together using a two-component curing adhesive (manufactured by Rock Paint Co., Ltd., product name: Adlock, base agent: RU-77T, curing agent: H-7). The thickness of the adhesive layer formed by the two-component curing adhesive was 3 μm.

[0127] The thickness of the laminate thus obtained was 86 μm.

[0128] Next, using the laminate obtained in this comparative example and a zipper tape containing polypropylene (manufactured by Takiron C.I. Co., Ltd., product name: Zipper Tape MX-13F, MX soft grade), a flat bag 20 as shown in Fig. 2 was produced (processing conditions: sealing temperature 175°C, sealing time 0.45 seconds). The body material film (laminate) was not deformed by heat sealing.

[0129] Comparative Example 2 A laminate was produced in the same manner as in Example 1, except that the two-component curing adhesive of Example 1 (manufactured by DIC Corporation, trade name: PASLIM VM NSRD011 / NSRD006) was replaced with the two-component curing adhesive of Comparative Example 1 (manufactured by Rock Paint Co., Ltd., trade name: Adlock, base agent: RU-77T, curing agent: H-7). The thickness of the adhesive layer formed with the adhesive was 2.5 μm.

[0130] Next, using the laminate obtained in this comparative example and a zipper tape containing polypropylene (manufactured by Takiron C.I. Co., Ltd., product name: Zipper Tape MX-13F, MX general-purpose grade), a flat bag 20 as shown in Fig. 2 was produced (processing conditions: sealing temperature 175°C, sealing time 0.30 seconds). The body material film (laminate) was not deformed by heat sealing.

[0131] Comparative Example 3 A biaxially oriented polypropylene resin film having a thickness of 30 μm was prepared as a substrate, and a printing layer having a thickness of 1 μm was formed on the biaxially oriented polypropylene resin film by gravure printing.

[0132] Next, a PET resin film (thickness 12 μm) with an aluminum vapor deposition film was prepared, and the printed layer of the biaxially stretched polypropylene resin film and the PET resin film were laminated via a two-component curing adhesive (manufactured by Rock Paint Co., Ltd., product name: Adlock, base agent: RU-77T, curing agent: H-7). The thickness of the adhesive layer formed by the two-component curing adhesive was 3 μm.

[0133] Next, a 30 μm thick unstretched polypropylene resin film was prepared, and the PET resin film of the biaxially stretched polypropylene resin film and the unstretched polypropylene resin film were laminated via a two-component curing adhesive (manufactured by Rock Paint Co., Ltd., trade name: Adlock, base agent: RU-77T, curing agent: H-7). The thickness of the adhesive layer formed by the two-component curing adhesive was 3 μm.

[0134] The thickness of the laminate thus obtained was 79 μm.

[0135] Next, using the laminate obtained in this comparative example and a zipper tape containing polypropylene (manufactured by Takiron C.I. Co., Ltd., product name: Zipper Tape MX-13F, MX soft grade), a flat bag 20 as shown in Fig. 2 was produced (processing conditions: sealing temperature 175°C, sealing time 0.45 seconds). The body material film (laminate) was deformed by heat sealing.

[0136] <<Oxygen Barrier Test>> The laminates obtained in the above Examples and Comparative Examples were cut into A4 size pieces, and the oxygen permeability (cc / m) was measured using OXTRAN 2 / 20 manufactured by MOCON, USA, at 23°C and a relative humidity of 90%. 2 The measurement results are summarized in Table 1.

[0137] <<Water vapor barrier test>> The laminates obtained in Example 1 and Comparative Examples 1 to 3 were cut into A4 size pieces, and the water vapor permeability (g / m) was measured at 40°C and a relative humidity of 90% using a PERMATRAN 3 / 31 manufactured by MOCON, USA. 2 The measurement results are summarized in Table 1.

[0138] <<Flexibility load test>> The laminates obtained in the above examples and comparative examples were subjected to a bending load (stroke: 155 mm, bending movement: 440°) five times in accordance with ASTM F 392 using a Gelbo Flex Tester (manufactured by Tester Sangyo Co., Ltd., product name: BE1006BE). After applying a flexural load, the oxygen permeability and water vapor permeability were measured in the same manner as in the oxygen barrier property test and water vapor barrier property test. The measurement results are summarized in Table 1.

[0139] [Table 1] [Explanation of symbols]

[0140] 10: Laminate 11: Base material 12: Adhesive layer 13: Sealant layer 14: Vapor deposition film 20: Flat bag 21,21': Body material film 22:Through hole 23: Zipper tape 24: Male tape 25: Female tape 30: Pillow bag 31: Body material film 32:Through hole 33: Zipper tape 40: Stand-up pouch 41, 41': Body material film 42:Through hole 43: Zipper tape 44: Base film

Claims

1. A packaging bag including a laminate, the laminate comprises a substrate, an adhesive layer, and a sealant layer; the laminate further comprises a vapor-deposited film between the adhesive layer and the sealant layer; the laminate has the vapor-deposited film on one surface of the sealant layer, the adhesive layer is a cured product of a two-component curing adhesive containing a polyester polyol and an isocyanate compound, the polyester polyol is a polyester polyol obtained by polycondensation of an ortho-oriented polycarboxylic acid or an anhydride thereof with a polyhydric alcohol, a polyester polyol having a glycerol skeleton, or a polyester polyol having an isocyanuric ring; the vapor-deposited film is an aluminum vapor-deposited film, the substrate is a stretched resin film, the substrate and the sealant layer contain the same resin material; the same resin material is polypropylene, A packaging bag comprising a zipper tape heat-sealed onto the sealant layer.

2. The packaging bag according to claim 1 , wherein the sealant layer is an unstretched resin film.

3. The packaging bag according to claim 1 or 2, wherein the content of the same resin material is 90% by mass or more.

4. The packaging bag according to any one of claims 1 to 3, wherein the thickness of the laminate is 10 µm or more and 130 µm or less.

5. The packaging bag according to any one of claims 1 to 4, wherein the adhesive layer has a thickness of 0.5 µm or more and 6 µm or less.

6. The packaging bag according to any one of claims 1 to 5, wherein the thickness of the vapor-deposited film is 1 nm or more and 140 nm or less.

7. the substrate, the sealant layer, and the zipper tape contain the same resin material; The packaging bag according to any one of claims 1 to 6, wherein the same resin material is polypropylene.

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