Laminates and packaging bags

Abstract

To provide a laminate that offers wear resistance in addition to recyclability, and a packaging bag.SOLUTION: A laminate has, at one end in its thickness direction, a polyethylene resin layer (an innermost layer 11a), and at the other end in the thickness direction, a biaxially stretched polypropylene resin layer (an outermost layer 11b), which has a coat layer 11c on its outer face. A film included in the laminate is composed solely of polypropylene resin or polyethylene resin.SELECTED DRAWING: Figure 2

Description

Technical Field

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

Background Art

[0002] As a conventional packaging bag, a standing pouch having self-standing property in which a two-folded bottom member is disposed between a pair of body members is used. Paragraph 0010 of Patent Document 1 describes using a laminate film having a sealant as the innermost layer and a stretched film as a base material.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] The composite film used for conventional packaging bags has a heat-adhesive resin (sealant) layer such as polyethylene (PE) on the inner surface, and a base material such as polyethylene terephthalate (PET) or nylon (Ny) having higher heat resistance than the sealant is laminated on the outer surface. When heat-bonding the composite film, the sealant is melted and the inner surface of the composite film is joined. However, a packaging bag containing different resins has a problem that it is difficult to recycle as a plastic container packaging.

[0005] In recent years, in order to facilitate recycling, a mono-material container packaging using a single or the same kind of resin has been proposed. For example, using biaxially stretched polypropylene (BO-PP) as a base material is also described in Patent Document 1. The combination of BO-PP and PE has excellent productivity because of the melting point difference between BO-PP and PE. However, compared with the combination of PET or Ny and PE, it is difficult to obtain abrasion resistance.

[0006] This invention has been made in view of the above circumstances, and aims to provide a laminate and packaging bag that are recyclable and also have abrasion resistance. [Means for solving the problem]

[0007] The present invention includes the following embodiments. A first aspect of the present invention is a laminate in which a polyethylene resin layer is disposed at one end in the thickness direction, and a biaxially oriented polypropylene resin layer having a coating layer on its outer surface is disposed at the other end in the thickness direction, characterized in that the film contained in the laminate consists only of a polypropylene resin or a polyethylene resin.

[0008] A second aspect of the present invention is a laminate of the first aspect, characterized in that the coating layer is present only on a part of the outer surface of the biaxially oriented polypropylene resin layer. A third aspect of the present invention is a laminate according to the first or second aspect, characterized in that the coating layer is a coating layer applied by gravure printing. A fourth aspect of the present invention is a laminate according to any one of the first to third aspects, characterized in that the coating layer consists of a two-component reaction type coating agent.

[0009] A fifth aspect of the present invention is a packaging bag characterized in that at least one component is formed from a laminate of any one of the first to fourth aspects. A sixth aspect of the present invention is a packaging bag according to the fifth aspect, characterized in that it is a standing pouch. A seventh aspect of the present invention is a packaging bag according to the sixth aspect, characterized in that the coating layer is present only on the lower part of the body member of the standing pouch. An eighth aspect of the present invention is a packaging bag according to any one of the fifth to seventh aspects, characterized in that it is used for sealing liquids. [Effects of the Invention]

[0010] According to the present invention, it is possible to provide laminates and packaging bags that offer abrasion resistance in addition to recyclability. [Brief explanation of the drawing]

[0011] [Figure 1] This is a front view illustrating an example of a packaging bag according to an embodiment. [Figure 2] This is a cross-sectional view along the line II-II in Figure 1. [Modes for carrying out the invention]

[0012] The present invention will be described below based on preferred embodiments.

[0013] The laminate of the embodiment consists solely of a polyolefin resin film. Examples of polyolefin resins include polypropylene resins and polyethylene resins.

[0014] A polyethylene resin layer is arranged at one end in the thickness direction of the laminate. A biaxially oriented polypropylene resin layer with a coating layer on its outer surface is arranged at the other end in the thickness direction of the laminate.

[0015] The laminate in this embodiment may consist only of a polyethylene resin layer at one end and a biaxially oriented polypropylene resin layer at the other end. Between these, other films, such as a polypropylene resin layer or a polyethylene resin layer, may be laminated. The number of film (resin layers) in the laminate is not particularly limited and may be two, three, four or more.

[0016] Figure 1 shows the external appearance of the packaging bag 10 according to the embodiment. Figure 2 is a cross-sectional view taken along the line II-II in Figure 1. The front and back of the packaging bag 10 are perpendicular to the plane of the paper in Figure 1, and left and right in Figure 2.

[0017] The packaging bag 10 is formed from a barrel member 11 and a bottom member 12. The laminate used for the barrel member 11 or the bottom member 12 may be collectively referred to as the laminates 11, 12. Although not particularly shown, it is also possible to form the packaging bag 10 using only the front and rear barrel members 11 by omitting the bottom member 12.

[0018] The barrel member 11 includes at least an innermost layer 11a, an outermost layer 11b, and a coat layer 11c. This barrel member 11 is formed from the laminate of the above-described embodiment. The innermost layer 11a is a polyethylene-based resin layer, and the outermost layer 11b is a biaxially stretched polypropylene-based resin layer. Although not particularly shown, one or more other polypropylene-based resin layers or polyethylene-based resin layers may be laminated between the innermost layer 11a and the outermost layer 11b.

[0019] The bottom member 12 includes at least an innermost layer 12a and an outermost layer 12b. The bottom member 12 may not have a coat layer. The innermost layer 12a and the outermost layer 12b are preferably a polyethylene-based resin layer or a polypropylene-based resin layer. Although not particularly shown, one or more other polypropylene-based resin layers or polyethylene-based resin layers may be laminated between the innermost layer 12a and the outermost layer 12b. The outermost layer 12b may be a biaxially stretched polypropylene-based resin layer.

[0020] The ratio of the total weight of the polyethylene-based resin layer contained in the laminates 11, 12 or the polyethylene-based resin in the entire resin component is preferably 80% by weight or more, more preferably 90% by weight or more, and may be 100% by weight. The polyethylene-based resin layer may contain additives in addition to the resin component.

[0021] The ratio of the total weight of the polypropylene-based resin layer contained in the laminates 11, 12 or the polypropylene-based resin in the entire resin component is preferably 80% by weight or more, more preferably 90% by weight or more, and may be 100% by weight. The polypropylene-based resin layer may contain additives in addition to the resin component.

[0022] The laminated body member 11 of this embodiment has a coating layer 11c on the outer surface of the outermost layer 11b. This improves the abrasion resistance of the body member 11. Furthermore, since the film contained in the body member 11 consists only of polypropylene resin or polyethylene resin, it is possible to improve recyclability compared to cases where PET or Ny is used as the base material.

[0023] The coating layer 11c may be formed from a coating agent such as a varnish or paint containing a resin component. The coating agent may contain a resin and a solvent, or it may contain a solvent-free resin. The resin used in the coating agent is not particularly limited, but examples include one or more of the following: urethane resin, acrylic resin, vinyl chloride-vinyl acetate copolymer resin, epoxy resin, polymethylpentene resin, cyclic olefin resin, unsaturated polyester resin, alkyd resin, polyimide resin, polyamide-imide resin, polyamide resin, nitrocellulose (nitrate cotton) resin, etc.

[0024] The type of coating agent is not particularly limited, but examples include a one-component type in which the composition is supplied in a pre-mixed state, and a two-component reaction type in which the main component and additives are supplied separately and mixed at the time of use. The coating agent may be supplied in a concentrated state, or it may be diluted at the time of use to obtain an appropriate concentration or viscosity. The solvent of the coating agent can be appropriately selected considering the performance when applied. The coating agent may contain a curing agent, crosslinking agent, etc., for curing the resin.

[0025] The coating layer only needs to be placed on the outer surface of the biaxially oriented polypropylene resin layer in areas where abrasion resistance is required, and it is not necessary to laminate the coating layer over the entire surface of the biaxially oriented polypropylene resin layer. For example, the coating layer 11c may be present only on the lower part of the body member 11 of the standing pouch. Here, the lower part of the body member 11 may include the area where the body member 11 overlaps with the bottom member 12, or it may include the area above the fold line 13. It is preferable to place the coating layer 11c in the area where the body member 11 bulges when the contents are filled.

[0026] The coating layer 11c may be positioned to avoid sealing areas such as the body sealing area 14 and the bottom sealing area 15. Since the contents are not filled into the sealing areas, wear is less likely to occur. Also, since the sealing areas are heated during heat bonding, the coating layer 11c on the sealing areas must be heat resistant. On the other hand, forming the coating layer 11c in the area including the sealing areas simplifies the shape of the area and makes alignment during bag making easier.

[0027] The method for forming the coating layer 11c is not particularly limited, but it is preferably applied by gravure printing. Gravure printing transfers ink filled into an intaglio plate to a substrate, allowing for highly reproducible printing even on resin films, and making it easy to apply thick layers of ink. Since it is widely used for printing on food packaging and the like, the coating layer 11c may be applied together with the printing of the laminates 11 and 12.

[0028] The laminates 11 and 12 are resin films mainly composed of polyolefin resin (polypropylene resin or polyethylene resin), but various designs are possible in addition to those described above.

[0029] Polyethylene resins may be homopolymers of ethylene or copolymers mainly composed of ethylene. Examples of monomers other than ethylene (comonomers) include one or more α-olefins such as 1-butene, 1-hexene, and 1-octene, cyclic olefins such as norbornene, and vinyl monomers such as vinyl acetate, vinyl chloride, and acrylic acid. When polyethylene resins are copolymerized with monomers having ester groups such as vinyl acetate, some of the ester groups may be saponified, resulting in a copolymer containing vinyl alcohol.

[0030] The proportion of ethylene in the constituent monomers of the polyethylene resin is preferably 50% by weight or more, and may be, for example, 80 to 100% by weight. The ethylene or comonomer may be a compound derived from fossil resources such as petroleum, or a compound derived from biomass such as plants. The resin contained in the polyethylene resin layer may consist solely of polyethylene resin. At least a portion of the polyethylene resin may also contain recycled polyethylene resin.

[0031] The polypropylene resin mentioned above may be a homopolymer of propylene (homoPP), or a random copolymer (randomPP) or block copolymer (blockPP) of propylene-ethylene copolymer, etc. Examples of monomers other than propylene (comonomers) include one or more α-olefins such as ethylene, 1-butene, 1-hexene, and 1-octene, and vinyl monomers such as vinyl acetate, vinyl chloride, and acrylic acid. When comonomers are used in the polypropylene resin, there may be one or more comonomers.

[0032] The proportion of propylene in the constituent monomers of the polypropylene resin is preferably 50% by weight or more, and may be, for example, 80 to 100% by weight. The propylene or comonomer may be a compound derived from fossil resources such as petroleum, or a compound derived from biomass such as plants. The resin contained in the polypropylene resin layer may consist only of polypropylene resin. At least a portion of the polypropylene resin may also contain recycled polypropylene resin.

[0033] The films contained in the laminates 11 and 12 may contain additives other than resin. The additives are not particularly limited, but examples include antioxidants, lubricants, antiblocking agents, flame retardants, UV absorbers, light stabilizers, antistatic agents, colorants, and crosslinking agents. The additives may be components compatible with the resin or components incompatible with the resin.

[0034] The innermost layers 11a and 12a can be used to join the laminates 11 and 12. Preferably, the innermost layers 11a and 12a are formed from an unstretched polyolefin resin. Specific examples of materials for forming the innermost layers 11a and 12a include, for example, linear low-density polyethylene (LLDPE), low-density polyethylene (LDPE), and polypropylene resins. The material forming the innermost layers 11a and 12a may be a single polyolefin resin or a blend of two or more polyolefin resins. The thickness of the innermost layers 11a and 12a is not particularly limited, but for example, it may be around 60 to 180 μm.

[0035] The outermost layers 11b and 12b may be the base material of the laminates 11 and 12. Specific examples of materials forming the outermost layers 11b and 12b include, for example, linear low-density polyethylene (LLDPE), low-density polyethylene (LDPE), medium-density polyethylene (MDPE), high-density polyethylene (HDPE), and polypropylene resins. The material forming the outermost layers 11b and 12b may be a single polyolefin resin or a blend of two or more polyolefin resins. The thickness of the outermost layers 11b and 12b is not particularly limited, but for example, it may be about 10 to 50 μm.

[0036] The proportion of the innermost layers 11a and 12a to the total thickness of the laminates 11 and 12 is preferably 50% or more, and may be around 60%, 70%, 80%, 90%, 95%, or an intermediate value. The proportion of the total thickness of the polyolefin resin layers to the total thickness of the laminates 11 and 12 is preferably 50% or more, and may be around 60%, 70%, 80%, 90%, 95%, 99%, or an intermediate value.

[0037] Each layer of film contained in the laminates 11 and 12 may be joined via an adhesive layer by dry lamination or the like, or it may be joined without an adhesive layer by co-extrusion, thermal lamination or the like.

[0038] The adhesive layer may be formed from an adhesive or from an anchor coating agent. The material used to form the adhesive layer is not particularly limited, but examples include urethane compounds, epoxy compounds, isocyanate compounds, polyethyleneimine, and organotitanium compounds such as titanium alkoxide. The thickness of the adhesive layer using an adhesive or anchor coating agent can be, for example, approximately 0.1 to 10 μm, 1 to 6 μm, or 3 to 4 μm.

[0039] The adhesive layer may be formed from an extruded resin. The material of the extruded resin is not particularly limited, but examples include adhesive resins and polyolefin resins. The thickness of the adhesive layer using the extruded resin can be approximately 3 to 30 μm, 5 to 25 μm, or 7 to 20 μm.

[0040] To impart barrier properties to the laminates 11 and 12, a thin film of a metal such as aluminum, or an inorganic compound such as silica or alumina may be laminated. For example, a barrier layer made of the above-mentioned metal or inorganic compound may be formed on at least one side of any of the films included in the laminates 11 and 12 by vapor deposition, plating, or the like.

[0041] The laminates 11 and 12 may have a printed layer (not shown). For example, a printed layer may be laminated on the inner or outer surface of the outermost layers 11b and 12b. The printed layer can be formed by printing ink in a solid or patterned manner using printing methods such as gravure printing, letterpress printing, offset printing, screen printing, or inkjet printing. The thickness of the printed layer is not particularly limited, but is typically around 0.5 to 10 μm. The printed layer may be formed over the entire surface of the laminate or on a part of the surface of the laminate. Two or more printed layers may be stacked on top of each other.

[0042] The ink used to form the printed layer may contain a coloring agent such as a pigment or dye, and a binder. The binder is not particularly limited, but examples include polyamide, polyurethane, polyester, polyvinyl chloride, polyvinyl acetate, vinyl chloride-vinyl acetate copolymer, acrylic polymer, polybutadiene, and cyclocompound rubber. The ink may also contain a solvent such as water, organic solvent, or vegetable oil. After printing, the ink can be dried by the evaporation of the solvent or curing of the ink. Heating or ultraviolet irradiation may be used to accelerate the drying of the ink.

[0043] For monomaterial containers and packaging made of polyolefin resin (polypropylene resin or polyethylene resin), it is preferable that the total weight of the polyolefin resin is 80% or more by weight of the total weight of the laminates 11 and 12, and the total weight of materials other than polyolefin resin is 20% or less by weight, and more preferably that the total weight of the polyolefin resin is 90% or more by weight, and the total weight of materials other than polyolefin resin is 10% or less by weight. This makes it possible to realize a monomaterial material of polyolefin resin even if adhesives or the like are used in the laminates 11 and 12.

[0044] Laminates having a coating layer can be used to manufacture packaging bags. The packaging bag only needs to have at least one component made from a laminate having a coating layer. The use of the packaging bag is not particularly limited, including disposable, refillable, storage, and storage of goods, but it is particularly suitable for applications where the contents are refilled once or multiple times into a main container used when the contents are consumed. In this case, the main container can be made durable for long-term use, and the packaging of the refill container can be simplified. Furthermore, recycling becomes easier when disposing of the refill container after the contents have been used up.

[0045] Laminates having a coating layer may have a portion for opening or cutting the packaging bag. The portion for opening or cutting may have a structure processed in the thickness direction of the film, such as a perforation, notch, or half-cut groove, or it may have a shape that suggests opening or cutting within the surface of the film, such as a thinly protruding spout, or it may be indicated by arrows, lines, dots, etc., printed on it. Cutting the packaging bag is not limited to cutting the opening portion, but may also be used to cut between or around packaging bags in areas where two or more packaging bags are formed in a continuous manner, or in areas where tags or display portions are continuous around the perimeter of the packaging bag.

[0046] Specific examples of packaging bags are not limited to three-sided sealed bags, four-sided sealed bags, pillow bags, flat bags, gusset bags, and standing pouches. The packaging bag 10 shown in Figure 1 is a standing pouch formed from a pair of body members 11 and a bottom member 12 that is folded in half along a fold line 13.

[0047] The packaging bag 10 has two body members 11, one at the front and one at the back. The planar shapes of the front and back body members 11 may be the same. The bottom member 12 is folded in along a fold line 13 so that its outer surfaces face each other. Above the fold line 13, body seal portions 14 are formed on the left and right sides, and the inner surfaces of the front and back body members 11 are joined together.

[0048] The bottom member 12 is sandwiched between the front and rear body members 11 with the fold line 13 facing upwards. Below the fold line 13, a bottom seal portion 15 is formed where the inner surface of the bottom member 12 is joined to the inner surface of the body member 11. The bottom seal portion 15 joins the area of ​​the bottom member 12 demarcated by the fold line 13 to the body member 11 on the same side in the front-to-back direction. At the side end 15a, the body seal portion 14 and the bottom seal portion 15 may overlap. By spreading the bottom member 12 relative to the fold line 13, the packaging bag 10 can be made to stand on its own.

[0049] If the packaging bag 10 has a body member 11 and a bottom member 12, the coating layer 11c of the embodiment may be used on either the body member 11 or the bottom member 12, or on both. From the viewpoint of improving abrasion resistance, it is preferable to use the coating layer 11c on the body member 11. It is also suitable for packaging bags 10 used to enclose liquids.

[0050] The dimensions of the packaging bag 10 are not particularly limited, but for example, when used as a refillable container, the height in the vertical direction is about 100-500 mm, the width in the horizontal direction is about 70-300 mm, and the filling volume is about 100 cm. 3 ~5000cm 3 The degree can be mentioned. The state of the contents can be fluids such as liquids, powders, or granules, or solids such as articles. The type of contents is not particularly limited, but can be detergents, chemicals, cosmetics, pharmaceuticals, beverages, seasonings, inks, paints, fuels, etc.

[0051] The packaging bag 10 may have a filling opening, a spout, etc. For example, the top of the packaging bag 10 may be open between the front and rear body members 11, allowing it to be used for filling or dispensing contents. After filling with contents, the body members 11 may be joined together to seal the packaging bag 10. When opening the packaging bag 10, the area where the body members 11 were joined can be easily torn. Although not specifically shown, the spout may be formed as a thin projection at the top or corner of the packaging bag 10. The spout may be made of film or be of the spout type. When a spout is installed diagonally at a corner, biaxial stretching is advantageous in terms of drop strength, etc.

[0052] The method for recycling the laminates 11, 12 or packaging bags 10 of the embodiment after use is not particularly limited, but can be appropriately selected depending on the condition at the time of collection, etc. Since the laminates 11, 12 of the embodiment can have a high proportion of polyolefin resin, both chemical recycling and mechanical recycling are possible. By recycling the laminates 11, 12 or packaging bags 10 of the embodiment, it is also possible to regenerate similar products such as laminates 11, 12 or packaging bags 10. The recycled material may be used in products such as paints, molded products, and hydrocarbon oils.

[0053] Although the present invention has been described above based on preferred embodiments, the present invention is not limited to the embodiments described above, and various modifications are possible without departing from the spirit of the invention. Modifications include the addition, substitution, omission, and other changes to the components.

[0054] The laminates 11 and 12 of the embodiment are laminated films mainly composed of polyolefin resin and are not limited to packaging laminates such as pouches, bags, containers, and packaging films, but can be used for various applications. If the laminates 11 and 12 are flexible laminated films, a flexible packaging bag 10 can be formed. The packaging bag 10 may be formed from the laminates 11 and 12 alone, or it may be combined with auxiliary components such as labels, tags, straws, and outer boxes. From a recycling standpoint, it is preferable that the auxiliary components can be separated from the packaging bag 10. [Examples]

[0055] The present invention will be described in more detail below as examples, but it is not limited to these examples.

[0056] <Fabrication of laminates> In Example 1, a film was laminated with a layer configuration of BO-PP 15 μm / VM-BO-PP 12 μm / PE 120 μm, each having a printed layer. A two-component reaction type coating layer based on vinyl chloride acetate was then formed on the outermost BO-PP layer or the printed layer to create a laminate. Example 2 was the same as Example 1, except that the coating layer was a two-component acrylic urethane type. Example 3 was the same as Example 1, except that the coating layer was a two-component reaction type based on vinyl chloride / acrylic polyol. Example 4 was the same as Example 1, except that the coating layer was a one-component nitrate cotton type.

[0057] Comparative Example 1 involved laminating a film with a layer configuration of Ny 15 μm / VM-PET 12 μm / PE 120 μm to create a laminate. Comparative Example 2 involved laminating a film with an MDO-PE25μm / PE110μm layer configuration to create a laminate. Comparative Example 3 involved laminating a film with a layer configuration of BO-PP 15 μm / VM-BO-PP 12 μm / PE 120 μm to create a laminate.

[0058] In the above layer configuration, PE represents polyethylene, PP represents polypropylene, PET represents polyethylene terephthalate, Ny represents nylon, BO- represents biaxially oriented, MDO- represents uniaxially oriented, and VM- represents aluminum vapor deposition.

[0059] <Evaluation of recyclability> The recyclability of the laminate was evaluated as good (○) if the laminate contained only PP or PE films, and poor (×) if it contained films other than PP or PE.

[0060] <Productivity Evaluation> The productivity of the packaging bags was evaluated based on the melting points of PE (135°C), PP (160°C), and Ny (260°C). A good (○) rating was given when the melting point of the outermost base material was higher than that of the innermost sealant, and a bad (×) rating was given when the melting points of the sealant and base material were the same.

[0061] <Evaluation of wear resistance> Using the target laminate, twelve standing pouches were prepared with a body width of 140 mm, a body height of 235 mm, and a bottom fold of 40 mm. These pouches were then filled with 430 g of liquid to create sample packaging bags. Six samples in two rows were packed upright inside a cardboard box measuring 20 cm deep, 35 cm wide, and 25 cm high. In each row, adjacent samples were placed diagonally, partially overlapping and slightly offset, resulting in a so-called sashimi-like arrangement. The abrasion resistance of the packaging bags was evaluated according to JIS Z0232, by conducting a Z-axis random vibration test for 3 hours (level 1). After the test, the appearance of the samples was visually inspected, and the evaluation was rated as good (○) if there was no abrasion on the body, acceptable (△) if slight abrasion was observed on the body, and poor (×) if abrasion was observed on the body.

[0062] <Evaluation Results> The evaluation results for Example 1 were: Recyclability: ○, Productivity: ○, Wear resistance: ○. The evaluation results for Example 2 were: recyclability: ○, productivity: ○, and wear resistance: ○. The evaluation results for Example 3 were: recyclability: ○, productivity: ○, and wear resistance: ○. The evaluation results for Example 4 were: Recyclability: ○, Productivity: ○, Wear resistance: △. The evaluation results for Comparative Example 1 were: Recyclability: ×, Productivity: ○, Wear resistance: ○. The evaluation results for Comparative Example 2 were: Recyclability: ○, Productivity: ×, Wear resistance: ○. The evaluation results for Comparative Example 3 were: Recyclability: ○, Productivity: ○, Wear Resistance: ×. [Explanation of symbols]

[0063] 10...Packaging bag, 11...Body member, 11a, 12a...Innermost layer, 11b, 12b...Outermost layer, 11c...Coating layer, 12...Bottom member, 13...Fold line, 14...Body seal section, 15...Bottom seal section, 15a...Side edge.

Claims

1. A laminate comprising a polyethylene resin layer at one end in the thickness direction and a biaxially oriented polypropylene resin layer having a coating layer on its outer surface at the other end in the thickness direction, wherein the film contained in the laminate consists only of polypropylene resin or polyethylene resin, and the resin used as the coating agent for the coating layer is one or more selected from the group consisting of urethane resin, acrylic resin, vinyl chloride-vinyl acetate copolymer resin, epoxy resin, polymethylpentene resin, cyclic olefin resin, unsaturated polyester resin, alkyd resin, polyimide resin, polyamide-imide resin, polyamide resin, and nitrocellulose resin.

2. The laminate according to claim 1, characterized in that the coating layer is present only on a part of the outer surface of the biaxially oriented polypropylene resin layer.

3. The laminate according to claim 1, characterized in that the coating agent consists of a two-component reaction type.

4. A packaging bag characterized in that at least one component is formed from a laminate according to any one of claims 1 to 3.

5. The packaging bag according to claim 4, characterized in that it is a standing pouch.

6. The packaging bag according to claim 5, characterized in that the coating layer is present only on the lower part of the body member of the standing pouch.

7. The packaging bag according to claim 4, characterized in that it is a packaging bag containing liquid.

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