Film, laminated film, packaging bag, pellet, and recycled film

Abstract

The present invention provides a film, laminated film, packaging bag, pellet, and recycled film that have excellent adhesion and can achieve both recyclability and barrier properties. More specifically, the film of the present invention contains a polyolefin-based resin without acid modification, an acid-modified polyolefin-based resin, and an ethylene-vinyl alcohol copolymer (EVOH). In the film 10 of the present invention, a first resin layer 11 containing a polyolefin-based resin without acid modification, a third resin layer 13 containing an acid-modified polyolefin-based resin, and a second resin layer 12 containing an ethylene-vinyl alcohol copolymer (EVOH) may be laminated in this order.

Description

Films, laminated films, packaging bags, pellets, and recycled films

[0001] The present invention relates to a film, a laminated film, a packaging bag, a pellet, and a recycled film.

[0002] Patent Documents 1 and 2 describe laminate films in which a polyolefin resin such as low-density polyethylene, linear low-density polyethylene, ethylene-vinyl acetate copolymer, polypropylene, or the like is laminated as a sealant layer on a substrate such as biaxially oriented polypropylene, biaxially oriented polyamide, biaxially oriented polyester, etc. They also suggest that a metal layer, a ceramic layer, an ethylene-vinyl alcohol copolymer (EVOH), or the like may be laminated to improve the barrier properties of the laminate film.

[0003] Japanese Patent Publication No. 2010-265020 Japanese Patent Publication No. 2013-039932

[0004] Packaging bags containing different resins are difficult to recycle as plastic containers and packaging. In recent years, mono-material containers and packaging using a single resin have been proposed to facilitate recycling. However, films using only polyethylene have poor barrier properties, which means their applications are severely limited.

[0005] The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a film, a laminated film, a packaging bag, pellets, and a recycled film that have excellent adhesion and are capable of achieving both recyclability and barrier properties.

[0006] In order to solve the above problems, one aspect of the present invention includes the following aspects.

[0007] The first embodiment is a film containing a non-acid-modified polyolefin resin, an acid-modified polyolefin resin, and an ethylene-vinyl alcohol copolymer (EVOH).

[0008] The second aspect is a film in which a first resin layer containing a non-acid-modified polyolefin-based resin, a third resin layer containing an acid-modified polyolefin-based resin, and a second resin layer containing an ethylene-vinyl alcohol copolymer (EVOH) are laminated in this order.

[0009] In a third aspect, in the second aspect, the first resin layer is laminated on both sides of the second resin layer with the third resin layer interposed therebetween.

[0010] In a fourth aspect, in the second or third aspect, the third resin layer is adjacent to the first resin layer, and the third resin layer is adjacent to the second resin layer, and they are laminated by co-extrusion.

[0011] A fifth aspect is any one of the second to fourth aspects, wherein the thickness of the second resin layer is 6 μm or less.

[0012] A sixth aspect is any one of the first to fifth aspects, wherein the non-acid-modified polyolefin resin is a non-acid-modified polyethylene resin, and the acid-modified polyolefin resin is an acid-modified polyethylene resin.

[0013] In a seventh aspect, in any one of the first to sixth aspects, the film is subjected to a stretching treatment.

[0014] An eighth aspect is a laminated film in which a sealant film is laminated on a base film, and at least one of the base film and the sealant film includes the film of any one of the first to seventh aspects.

[0015] The ninth embodiment is a laminated film in which a sealant film is laminated on one side of the film of any one of the first to seventh embodiments via a biaxially oriented polyethylene resin layer.

[0016] A tenth aspect is a packaging bag having at least one member formed from the laminate film of the eighth or ninth aspect.

[0017] An eleventh aspect is the tenth aspect, wherein the packaging bag is a stand-up pouch.

[0018] A twelfth aspect is a pellet made by recycling the film of any one of the first to seventh aspects.

[0019] A thirteenth aspect is a pellet made by recycling the laminated film of the eighth or ninth aspect.

[0020] A fourteenth aspect is a recycled film made using the pellets of the twelfth aspect.

[0021] A fifteenth aspect is a recycled film made using the pellets of the thirteenth aspect.

[0022] According to the present invention, it is possible to provide a film, a laminated film, a packaging bag, pellets, and a recycled film that have excellent adhesion and are capable of achieving both recyclability and barrier properties.

[0023] Fig. 1 is a cross-sectional view showing a first example of a film of the present embodiment; Fig. 2 is a cross-sectional view showing a second example of a film of the present embodiment; Fig. 3 is a cross-sectional view showing an example of a laminated film of the present embodiment; Fig. 4 is a front view showing an example of a packaging bag of the present embodiment.

[0024] The present invention will be described below based on preferred embodiments.

[0025] The film of this embodiment contains a polyolefin resin that is not acid-modified, an acid-modified polyolefin resin, and an ethylene-vinyl alcohol copolymer (EVOH). In the following description, a resin that is not acid-modified may be referred to as "unmodified." For example, an unmodified polyolefin resin refers to a polyolefin resin that is not acid-modified.

[0026] The unmodified polyolefin resin, the acid-modified polyolefin resin, and the EVOH may be mixed in the same resin layer. Any two of these three types may be mixed in the same resin layer, and the remaining one may be laminated as a separate resin layer. These three types of resins may each be laminated as a separate resin layer.

[0027] EVOH can be obtained by copolymerizing ethylene with a vinyl ester monomer, saponifying the resulting copolymer, and converting the vinyl ester units to vinyl alcohol units, etc. Examples of the vinyl ester monomer include vinyl carboxylates such as vinyl formate, vinyl acetate, vinyl butyrate, and vinyl benzoate.

[0028] The greater the proportion of vinyl alcohol units in EVOH, the better the barrier properties, but the lower the moisture resistance. Therefore, it is preferable for EVOH to have an appropriate ethylene content. Examples of the ethylene content of EVOH include 20 to 60 mol%. The saponification degree of EVOH is not limited to 100 mol%, but is preferably 80 mol% or more.

[0029] By using an acid-modified polyolefin resin in the film, the compatibility between the unmodified polyolefin resin and EVOH can be improved. For example, when the unmodified polyolefin resin and EVOH are mixed, a dispersion state resembling a microscopic sea-island structure is likely to be obtained. When the unmodified polyolefin resin, the acid-modified polyolefin resin, and EVOH are mixed and mixed, uniform dispersion is easily achieved.

[0030] Examples of unmodified polyolefin resins include unmodified polyethylene resins, unmodified polypropylene resins, etc. Examples of acid-modified polyolefin resins include acid-modified polyethylene resins, acid-modified polypropylene resins, etc.

[0031] When the unmodified polyolefin resin is an unmodified polyethylene resin, the acid-modified polyolefin resin is preferably an acid-modified polyethylene resin. When the unmodified polyolefin resin is an unmodified polypropylene resin, the acid-modified polyolefin resin is preferably an acid-modified polypropylene resin. This can improve the compatibility of the three resins.

[0032] The polyethylene resin in the unmodified polyethylene resin or acid-modified polyethylene resin is not particularly limited, but examples include low-density polyethylene (LDPE), linear low-density polyethylene (LLDPE), medium-density polyethylene (MDPE), high-density polyethylene (HDPE), etc. When the film is to be stretched, HDPE is preferred from the viewpoint of heat resistance.

[0033] 1 includes a first resin layer 11 containing an unmodified polyolefin resin, a third resin layer 13 containing an acid-modified polyolefin resin, and a second resin layer 12 containing EVOH, laminated in this order. In the illustrated example, the first resin layer 11 is laminated on one side of the second resin layer 12 with the third resin layer 13 interposed therebetween.

[0034] 2, the first resin layer 11 is laminated on both sides of the second resin layer 12, with the third resin layer 13 interposed therebetween. In this case, five layers, namely, the first resin layer 11 / the third resin layer 13 / the second resin layer 12 / the third resin layer 13 / the first resin layer 11, are laminated in this order.

[0035] In these films 10 and 20, the third resin layer 13 may be adjacent to the first resin layer 11, and the third resin layer 13 may be adjacent to the second resin layer 12, and laminated by coextrusion, thereby improving adhesion between the layers.

[0036] From the viewpoint of recyclability, the thickness of the second resin layer 12 containing EVOH is preferably as thin as possible, and is preferably 10 μm or less, more preferably 6 μm or less, and even more preferably 4 μm or less. From the viewpoint of barrier properties, the thickness of the second resin layer 12 is preferably 1 μm or more, more preferably 2 μm or more. The thickness of the second resin layer 12 is, for example, 1 to 5 μm or 2 to 3 μm.

[0037] Although the films 10 and 20 are multilayer films, when they are melt-kneaded, the unmodified polyolefin resin, the acid-modified polyolefin resin, and the EVOH are easily mixed into the same resin composition, which makes it easier to recycle the films 10 and 20 that have barrier properties.

[0038] The proportion of the unmodified polyolefin resin in the first resin layer 11 is preferably 50% by weight or more, and may be, for example, 80 to 100% by weight or 90 to 100% by weight. The unmodified polyolefin resin contained in the first resin layer 11 may be one type or a blend of two or more types. The first resin layer 11 may be a resin layer that does not contain an acid-modified polyolefin resin or EVOH.

[0039] The proportion of EVOH in the second resin layer 12 is preferably 50% by weight or more, and may be, for example, 80 to 100% by weight or 90 to 100% by weight. The EVOH contained in the second resin layer 12 may be one type or a blend of two or more types. The second resin layer 12 may be a resin layer that does not contain an unmodified polyolefin resin or an acid-modified polyolefin resin.

[0040] The proportion of the acid-modified polyolefin resin in the third resin layer 13 is preferably 50% by weight or more, and may be, for example, 80 to 100% by weight or 90 to 100% by weight. The acid-modified polyolefin resin contained in the third resin layer 13 may be one type or a blend of two or more types. The third resin layer 13 may be a resin layer that does not contain an unmodified polyolefin resin or EVOH.

[0041] Each of the resin layers included in the films 10 and 20, i.e., the first resin layer 11, the second resin layer 12, and the third resin layer 13, may contain additives other than resin. Examples of additives include, but are not limited to, antioxidants, lubricants, antiblocking agents, flame retardants, UV absorbers, light stabilizers, antistatic agents, colorants, and crosslinking agents. The additives may be either components that are compatible with the resin or components that are incompatible with the resin.

[0042] The polyethylene-based resin used in the first resin layer 11 and / or the third resin layer 13 may be a homopolymer of ethylene or a copolymer mainly composed of ethylene. Examples of monomers (comonomers) other than ethylene include one or more of 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 a comonomer is used in the polyethylene-based resin, the comonomer may be one or more of different types.

[0043] The proportion of ethylene in the constituent monomers of the polyethylene-based resin is preferably 50% by weight or more, and may be, for example, 80 to 100% by weight. The ethylene or comonomer used in the polyethylene-based resin may be a compound derived from a fossil resource such as petroleum, or may be a compound derived from biomass such as plants. The polyethylene-based resin layer may consist solely of a polyethylene-based resin, or may contain other resins. At least a portion of the polyethylene-based resin may be recycled polyethylene.

[0044] The acid-modified polyolefin resin is a resin obtained by modifying an unmodified polyolefin resin with an acid-modified monomer. The acid modification of the unmodified polyolefin resin may be performed by copolymerizing the acid-modified monomer with an olefin monomer, or by melt-kneading the acid-modified monomer with the unmodified polyolefin resin in the presence of a radical polymerization initiator to graft-modify the unmodified polyolefin resin.

[0045] The acid-modified monomer may be one or more unsaturated carboxylic acids and / or unsaturated carboxylic acid anhydrides. Examples of unsaturated carboxylic acids include acrylic acid, methacrylic acid, crotonic acid, maleic acid, fumaric acid, citraconic acid, mesaconic acid, and itaconic acid. Examples of unsaturated carboxylic acid anhydrides include maleic anhydride, citraconic anhydride, and itaconic anhydride.

[0046] The olefin monomer used in the polyolefin resin may be one or more monomers containing ethylene and / or α-olefin. The radical polymerization initiator may be an organic peroxide or an aliphatic azo compound.

[0047] The thickness of the film of this embodiment is not particularly limited, but may be, for example, about 10 to 200 μm, or may be, for example, about 10 to 50 μm. The thickness of the first resin layer 11 is not particularly limited, but may be, for example, about 4 to 24 μm. The thickness of the third resin layer 13 is not particularly limited, but may be, for example, about 2 to 24 μm.

[0048] The film of this embodiment may be the multilayer film 10, 20 described above, or may be a single layer film in which three types of resin, i.e., unmodified polyolefin resin, acid-modified polyolefin resin, and EVOH, are mixed in the same resin layer.

[0049] The film of this embodiment may be an unstretched film or may be stretched. When stretched, the stretching direction is not particularly limited, and may be the machine direction (MD) or the cross direction (TD). Biaxial stretching in the MD and TD directions is also possible. The stretching ratio is preferably 2 to 10 times, and more preferably 3 to 6 times.

[0050] In the case of biaxial stretching, the stretching ratios in each stretching direction may be the same, or the stretching ratio in the MD direction may be different from the stretching ratio in the TD direction. The stretching direction in uniaxial or biaxial stretching may be an oblique direction intersecting the MD direction and the TD direction. In the case of uniaxial stretching, stretching in the MD direction is preferred in consideration of processability and printability.

[0051] When the multilayer films 10 and 20 are stretched, they are preferably stretched in the same direction after lamination by coextrusion. This allows the thickness of the second resin layer 12 containing EVOH to be reduced. By reducing the amount of EVOH used, which is relatively expensive, the material costs of the films 10 and 20 can be reduced.

[0052] The film of the present embodiment may be bonded to another resin film to form a laminated film. The laminated film of the present embodiment is a laminate including the film of the present embodiment and another resin film. For example, in the case of a laminated film in which a sealant film is laminated on a base film, at least one of the base film and the sealant film may include the film of the present embodiment.

[0053] The base film is laminated on the outer side of the sealant film in the thickness direction of the laminate film. Resins used for the base film include LDPE, LLDPE, MDPE, HDPE, polypropylene-based resins, etc. The thickness of the base film is not particularly limited, but may be, for example, about 10 to 50 μm.

[0054] Resins used for the sealant film include LDPE, LLDPE, unstretched polyolefin resins, adhesive resins, etc. The thickness of the sealant film is not particularly limited, but may be, for example, about 50 to 180 μm. The sealant film may be a single-layer film or a multi-layer film.

[0055] 3, a sealant film 31 is laminated on one side of a film 33 containing an unmodified polyolefin resin, an acid-modified polyolefin resin, and EVOH, via an intermediate resin layer 32. At least one of the intermediate resin layer 32 and / or the film 33 may be a substrate film.

[0056] The film 33 may be a single-layer film containing the above three resins, or may be the above-mentioned multilayer film 10, 20. The film 33 may be formed from a resin composition obtained by melt-kneading the films 10, 20 and used in the laminate film 30.

[0057] The intermediate resin layer 32 is a resin layer (biaxially oriented polyethylene resin layer) containing biaxially oriented polyethylene resin (BOPE). The intermediate resin layer 32 containing BOPE is adjacent to the sealant film 31, so that sufficient strength can be obtained and hand tearability can be improved.

[0058] The proportion of BOPE in the intermediate resin layer 32 is preferably 50% by weight or more, and may be, for example, 80 to 100% by weight or 90 to 100% by weight. Examples of polyethylene resins used in BOPE include LDPE, LLDPE, MDPE, and HDPE. From the viewpoints of physical strength and heat resistance, it is preferable to use HDPE for the intermediate resin layer 32.

[0059] Adhesive layers 34, 35 may be provided between the layers of the laminated film 30. In the illustrated example, the adhesive layer 34 is laminated between the sealant film 31 and the intermediate resin layer 32, and the adhesive layer 35 is laminated between the intermediate resin layer 32 and the film 33.

[0060] The adhesive layers 34, 35 may be formed from an adhesive or an anchor coating agent. Materials for forming the adhesive or anchor coating agent are not particularly limited, but include urethane compounds, epoxy compounds, isocyanate compounds, polyethyleneimine, and organic titanium compounds such as titanium alkoxide. The thickness of the adhesive layers 34, 35 may be, for example, about 0.1 to 10 μm, about 1 to 6 μm, or about 3 to 4 μm.

[0061] At least one of the adhesive layers 34, 35 may be formed from an extruded resin. The material of the extruded resin is not particularly limited, but examples thereof include adhesive resins and polyolefin-based resins. The extruded resin may also be a polyethylene-based resin. Examples of thicknesses of the adhesive layers 34, 35 using extruded resin include approximately 3 to 30 μm, approximately 5 to 25 μm, and approximately 7 to 20 μm.

[0062] When the sealant film 31 and the intermediate resin layer 32 are laminated by thermal lamination or the like, the adhesive layer 34 may be omitted. When the intermediate resin layer 32 and the film 33 are laminated by thermal lamination or the like, the adhesive layer 35 may be omitted. Regardless of the presence or absence of the adhesive layers 34, 35, at least one of the films laminated between the layers may be subjected to a surface treatment such as ozone treatment, plasma treatment, corona treatment, discharge treatment, or flame treatment.

[0063] The laminated film 30 may have a printed layer. For example, a printed layer may be laminated on the inner or outer surface of the intermediate resin layer 32 or the film 33. Two or more printed layers may be superimposed. The printed layer may be formed using a solvent-based ink or a solventless ink. Printing using a solvent-based ink may include a drying step. Printing using a solventless ink may include a curing step.

[0064] The laminate film 30 may have a barrier layer such as a metal layer or a ceramic layer. Since the EVOH contained in the film 33 has barrier properties, the laminate film 30 may not have a metal layer or a ceramic layer. Since EVOH can be melt-kneaded with polyolefin resins, the recyclability of the laminate film 30 is improved.

[0065] For mono-material container packaging, the total amount of the specific resins is preferably 80% by weight or more and the total amount of materials other than the specific resins is preferably 20% by weight or less, and more preferably 90% by weight or more and the total amount of materials other than the specific resins is 10% by weight or less, based on the total weight of the laminate film of this embodiment. The specific resin may be any one of polyolefin resins, polyethylene resins, polypropylene resins, etc.

[0066] The laminated film of this embodiment can be used to produce a packaging bag. At least one component of the packaging bag of this embodiment may be formed from the laminated film of this embodiment. The packaging bag can be used for disposable use, refill use, storage, or for storing goods. The dimensions of the packaging bag are not particularly limited, but may be, for example, a vertical height of about 100 to 500 mm, a horizontal width of about 70 to 300 mm, and a filling capacity of 100 to 5,000 cm. ３ The degree of

[0067] The contents may be fluids such as liquids, powders, or particles, or solids such as articles. The packaging bag may be used to enclose a liquid. Specific examples of the contents include detergents, medicines, cosmetics, pharmaceuticals, beverages, seasonings, inks, paints, and fuels. The packaging bag may have a filling opening, a pouring outlet, or the like. The pouring outlet may be a film-formed or spout-type.

[0068] Specific examples of packaging bags include, but are not limited to, three-sided sealed bags, four-sided sealed bags, pillow bags, flat bags, gusseted bags, stand-up pouches, etc. Fig. 4 shows an example of a packaging bag 100. The packaging bag 100 is a stand-up pouch formed from a pair of body members 101 and a bottom member 102 folded in half along a fold line 103.

[0069] The packaging bag 100 has two body members 101 arranged at the front and rear. The bottom member 102 is folded along a fold line 103 so that the outer surfaces face each other. Above the fold line 103, the front and rear body members 101 are joined to each other at left and right body seals 104. Below the fold line 103, a bottom seal 105 is formed in which the inner surface of the bottom member 102 is joined to the inner surface of the body member 101.

[0070] The method for recycling the film of this embodiment and the laminate film or packaging bag using the same after use is not particularly limited, but can be appropriately selected depending on the condition at the time of collection, etc., and either chemical recycling or mechanical recycling is possible. It is also possible to recycle the laminate film or packaging bag into the same type of product, such as a laminate film or packaging bag, by recycling the laminate film or packaging bag. For example, the pellets of this embodiment are made by recycling the film or laminate film of this embodiment. These pellets are then used to make recycled film. The recycled film can be used to manufacture laminate films, packaging bags, etc. Furthermore, materials obtained by recycling these films, recycled films, laminate films, or packaging bags may be used in products such as paints, molded products, and hydrocarbon oils.

[0071] The film of this embodiment contains an unmodified polyolefin resin, an acid-modified polyolefin resin, and EVOH, and therefore has excellent compatibility with EVOH. The film of this embodiment and a laminated film or packaging bag using the film may be melt-kneaded and recycled as a resin material. A film-forming process such as extrusion molding can produce a single-layer film in which the three types of polyolefin resin, acid-modified polyolefin resin, and EVOH are mixed in the same resin layer.

[0072] The EVOH contained in the film of this embodiment generates heat when exposed to a laser, making laser processing possible. In the case where the second resin layer 12 containing EVOH is present on one surface of the film (for example, the configuration shown in FIG. 1), the film may be one in which a metal or metal oxide is vapor-deposited on the EVOH surface.

[0073] In the laminated film of the present embodiment, when a resin layer other than the film of the present embodiment is laminated, it is preferable to laminate a polyolefin-based resin. When the unmodified polyolefin-based resin and the acid-modified polyolefin-based resin used in the film of the present embodiment are polyethylene-based resins, it is preferable to laminate a polyethylene-based resin as a resin layer other than the film of the present embodiment.

[0074] While the present invention has been described above based on preferred embodiments, the present invention is not limited to the above-described embodiments and various modifications can be made without departing from the spirit of the present invention. Modifications include addition, substitution, omission, and other changes of components.

[0075] The present invention will be explained in more detail below using examples, but the present invention is not limited to these examples.

[0076] <Layer structure of film> In Example 1, three layers of HDPE 18 μm / aPE 3 μm / EVOH 4 μm were laminated and stretched at a stretch ratio of 5 in the MD direction. In Example 2, five layers of HDPE 8 μm / aPE 3 μm / EVOH 3 μm / aPE 3 μm / HDPE 8 μm were laminated and stretched at a stretch ratio of 5 in the MD direction. In Comparative Example 1, a single layer film of HDPE 25 μm was used. In Comparative Example 2, two layers of HDPE 20 μm / EVOH 4 μm were laminated.

[0077] In the explanation of the layer structure, the numerical values ​​in μm indicate thickness, HDPE indicates high density polyethylene, EVOH indicates ethylene-vinyl alcohol copolymer, and aPE indicates acid-modified polyethylene resin.

[0078] <Oxygen Barrier Property of Film> The oxygen gas permeability of each film was measured under conditions of a temperature of 30°C and a humidity of 70% RH. ２ If it was less than .times.day.atm, it was rated as good (.largecircle.), and if it was more than that, it was rated as bad (x).

[0079] <Film recyclability> The compositions obtained by melt-kneading each film were molded into single-layer films, and the cut surfaces were observed with an electron microscope and photographed. A film with a uniform sea-island structure and no visible sea-island structure was rated as good (◯), and a film with a non-uniform sea-island structure was rated as poor (×).

[0080] <Film Adhesion> When the film was a multilayer film, good interlayer adhesion was evaluated as good (◯), and poor interlayer adhesion was evaluated as poor (×). When the film to be evaluated was a single-layer film, it was evaluated as good (◯).

[0081] <Evaluation Results> The evaluation results for Example 1 were oxygen barrier property: good, recyclability: good, and adhesion: good. The evaluation results for Example 2 were oxygen barrier property: good, recyclability: good, and adhesion: good. The evaluation results for Comparative Example 1 were oxygen barrier property: bad, recyclability: good, and adhesion: good. The evaluation results for Comparative Example 2 were oxygen barrier property: good, recyclability: bad, and adhesion: bad.

[0082] The oxygen barrier properties of each film were measured as follows: Examples 1 and 2, and Comparative Example 2: 9.5 cc / m ２ ·day·atm, but in Comparative Example 1 it was 500cc / m ２ ・day・atm or more.

[0083] 10, 20, 33...film, 11...first resin layer, 12...second resin layer, 13...third resin layer, 30...laminated film, 31...sealant film, 32...intermediate resin layer, 34, 35...adhesive layers, 100...packaging bag, 101...body member, 102...bottom member, 103...fold line, 104...body seal portion, 105...bottom seal portion.

Claims

A film comprising a non-acid-modified polyolefin resin, an acid-modified polyolefin resin, and an ethylene-vinyl alcohol copolymer (EVOH). 　 A film characterized by comprising a first resin layer containing a non-acid-modified polyolefin resin, a third resin layer containing an acid-modified polyolefin resin, and a second resin layer containing an ethylene-vinyl alcohol copolymer (EVOH) laminated in this order. 　 The film according to claim 2 , wherein the first resin layer is laminated on both sides of the second resin layer with the third resin layer interposed therebetween. 　 The film according to claim 2 or 3, characterized in that the third resin layer is adjacent to the first resin layer and the third resin layer is adjacent to the second resin layer, and the films are laminated by coextrusion.

5. The film according to claim 2, wherein the second resin layer has a thickness of 6 μm or less. 　 The film according to any one of claims 1 to 5, wherein the non-acid-modified polyolefin resin is a non-acid-modified polyethylene resin, and the acid-modified polyolefin resin is an acid-modified polyethylene resin. 　 The film according to any one of claims 1 to 6, characterized in that the film has been subjected to a stretching treatment. 　 A laminated film in which a sealant film is laminated on a base film, wherein at least one of the base film and the sealant film comprises the film according to any one of claims 1 to 7. 　 A laminated film, comprising the film according to any one of claims 1 to 7, and a sealant film laminated on one side thereof via a biaxially oriented polyethylene resin layer. 　 A packaging bag, characterized in that at least one member thereof is formed from the laminated film according to claim 8 or 9. 　 The packaging bag according to claim 10, wherein the packaging bag is a stand-up pouch. 　 Pellets produced by recycling the film according to any one of claims 1 to 7. 　 Pellets produced by recycling the laminated film according to claim 8 or 9. 　 A recycled film made using the pellets of claim 12. 　 A recycled film made using the pellets of claim 13.

Images