Film, laminate film, packaging bag, pellets, and recycled film

Abstract

To provide a film, a laminate film, a packaging bag, pellets and a recycled film which have excellent adhesiveness, and are capable of satisfying recyclability and barrier property.SOLUTION: Provided is a film 10 containing a polyolefin-based resin which is not acid-modified, an acid-modified polyolefin-based resin, and an ethylene-vinyl alcohol copolymer (EVOH), where a first resin layer 11 containing the polyolefin-based resin which is not acid-modified, a third resin layer 13 containing the acid-modified polyolefin-based resin, and a second resin layer 12 containing the ethylene-vinyl alcohol copolymer (EVOH) may be laminated in this order.SELECTED DRAWING: Figure 1

Description

[Technical Field]

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

[0002] Paragraph 0012 of Patent Document 1 and paragraph 0010 of Patent Document 2 describe a laminate film 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. It is also suggested 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. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2010-265020 [Patent Document 2] Japanese Patent Application Laid-Open No. 2013-39932 Summary of the Invention [Problem to be solved by the invention]

[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. [Means for solving the problem]

[0006] The present invention includes the following aspects. The film of the first embodiment contains a non-acid-modified polyolefin resin, an acid-modified polyolefin resin, and an ethylene-vinyl alcohol copolymer (EVOH).

[0007] The film of the second embodiment has 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.

[0008] 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. 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. 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.

[0009] A sixth aspect is 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. In a seventh aspect, in any one of the first to sixth aspects, the film is subjected to a stretching treatment.

[0010] The laminated film of the eighth embodiment 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 comprises the film of the first to seventh embodiments. The laminated film of the ninth aspect has a sealant film laminated on one side of the film of the first to seventh aspects via a biaxially oriented polyethylene resin layer.

[0011] In a packaging bag according to a tenth aspect, at least one member is formed from the laminated film according to the eighth or ninth aspect. An eleventh aspect is the tenth aspect, wherein the packaging bag is a stand-up pouch. The pellets of the twelfth embodiment are made by recycling the films of the first to seventh embodiments. The pellets of the thirteenth embodiment are made by recycling the laminated film of the eighth or ninth embodiment. The recycled film of the fourteenth embodiment is made using the pellets of the twelfth embodiment. The recycled film of the fifteenth embodiment is made using the pellets of the thirteenth embodiment. [Effects of the Invention]

[0012] 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. [Brief explanation of the drawings]

[0013] [Figure 1] FIG. 1 is a cross-sectional view showing a first example of a film according to an embodiment. [Figure 2] FIG. 2 is a cross-sectional view showing a second example of the film of the embodiment. [Figure 3] FIG. 1 is a cross-sectional view showing an example of a laminated film. [Figure 4] FIG. 1 is a front view showing an example of a packaging bag. DETAILED DESCRIPTION OF THE INVENTION

[0014] The present invention will be described below based on preferred embodiments.

[0015] The film of the 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.

[0016] 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 may be mixed in the same resin layer, and the remaining one may be laminated as a separate resin layer. These three resins may each be laminated as a separate resin layer.

[0017] 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. Examples of the vinyl ester monomer include vinyl carboxylates such as vinyl formate, vinyl acetate, vinyl butyrate, and vinyl benzoate.

[0018] The greater the proportion of vinyl alcohol units in EVOH, the better the barrier properties, but the lower the moisture resistance, so it is preferable for EVOH to have an appropriate ethylene content. The ethylene content of EVOH is, for example, 20 to 60 mol%. The saponification degree of EVOH is not limited to 100 mol%, but is preferably, for example, 80 mol% or more.

[0019] 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 unmodified polyolefin resin and EVOH are mixed together, a microscopic dispersion state resembling a sea-island structure is likely to be formed. When unmodified polyolefin resin, acid-modified polyolefin resin, and EVOH are mixed together, uniform dispersion is easily achieved.

[0020] 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.

[0021] 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.

[0022] 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 stretched, HDPE is preferred from the viewpoint of heat resistance.

[0023] 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.

[0024] 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.

[0025] 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.

[0026] From the viewpoint of recyclability, the thinner the thickness of the second resin layer 12 containing EVOH, the better, and it may be 10 μm or less, or even 6 μm or less, and more preferably 4 μm or less. From the viewpoint of barrier properties, the thickness of the second resin layer 12 may be 1 μm or more, or even 2 μm or more. The thickness of the second resin layer 12 is preferably 1 to 5 μm, and more preferably 2 to 3 μm.

[0027] 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 barrier films 10 and 20.

[0028] 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.

[0029] 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.

[0030] 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 unmodified polyolefin resin or EVOH.

[0031] 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.

[0032] 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.

[0033] 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 used in the polyethylene 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 resin layer may consist solely of a polyethylene resin, or may contain other resins. At least a portion of the polyethylene resin may be recycled polyethylene.

[0034] 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.

[0035] 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.

[0036] The olefin monomer used in the polyolefin resin may be one or more of ethylene and / or α-olefin. The radical polymerization initiator may be an organic peroxide or an aliphatic azo compound.

[0037] The thickness of the film of the embodiment is not particularly limited, but may be, for example, about 10 to 200 μm, or may be 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 4 to 24 μm.

[0038] The film of the embodiment may be the multilayer film 10, 20 described above, or may be a single layer film in which three types of resins, unmodified polyolefin resin, acid-modified polyolefin resin, and EVOH, are mixed in the same resin layer.

[0039] The film of the 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 transverse 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.

[0040] In the case of biaxial stretching, the stretching ratio 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.

[0041] 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.

[0042] The film of the embodiment may be bonded to another resin film to form a laminate film. The laminate film of the embodiment is a laminate containing the film of the embodiment and another resin film. For example, in the case of a laminate film in which a sealant film is laminated on a base film, at least one of the base film and the sealant film may contain the film of the embodiment.

[0043] The base film is laminated on the outer side of the sealant film in the thickness direction of the laminated 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.

[0044] 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.

[0045] 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.

[0046] The film 33 may be a single-layer film containing the above three resins, or may be the above-mentioned multilayer films 10 and 20. The film 33 may be formed from a resin composition obtained by melt-kneading the films 10 and 20, and used in the laminate film 30.

[0047] The intermediate resin layer 32 is a resin layer (biaxially oriented polyethylene resin layer) containing a biaxially oriented polyethylene resin (BOPE). The BOPE-containing intermediate resin layer 32 is adjacent to the sealant film 31, so that sufficient strength can be obtained and hand tearability can be improved.

[0048] 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. As the polyethylene resin used for BOPE, any of LDPE, LLDPE, MDPE, and HDPE can be used. From the viewpoints of physical strength and heat resistance, it is preferable to use HDPE for the intermediate resin layer 32.

[0049] 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.

[0050] 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, approximately 0.1 to 10 μm, approximately 1 to 6 μm, or approximately 3 to 4 μm.

[0051] 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 resin and polyolefin resin. The extruded resin may be a polyethylene-based resin. The thickness of the adhesive layers 34, 35 using the extruded resin may be about 3 to 30 μm, about 5 to 25 μm, or about 7 to 20 μm.

[0052] 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.

[0053] 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.

[0054] 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.

[0055] 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 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 laminated film of the embodiment. The specific resin may be any one of polyolefin resin, polyethylene resin, polypropylene resin, etc.

[0056] The laminated film of the embodiment can be used to produce a packaging bag. At least one member of the packaging bag of the embodiment may be formed from the laminated film of the 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 cm 3 ~5000cm 3 The degree of

[0057] 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, and the like. The pouring outlet may be a film-molded or spout-type.

[0058] 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.

[0059] The packaging bag 100 has one body member 101 arranged at the front and one at the back. 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.

[0060] The method for recycling the film of the embodiment and the laminate film or packaging bag of the embodiment 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. The laminate film or packaging bag can also be recycled into the same type of product, such as a laminate film or packaging bag, by recycling. For example, the pellets of the embodiment are produced by recycling the film of the embodiment or the laminate film of the embodiment. These pellets are then used to produce 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.

[0061] The film of the embodiment contains an unmodified polyolefin resin, an acid-modified polyolefin resin, and EVOH, and therefore has excellent compatibility with EVOH. The film of the 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 unmodified polyolefin resin, the acid-modified polyolefin resin, and EVOH are mixed in the same resin layer.

[0062] The EVOH contained in the film of the embodiment generates heat when exposed to a laser, making it possible to perform laser processing. 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.

[0063] In the laminated film of the embodiment, when a resin layer other than the film of the 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 embodiment are polyethylene-based resins, it is preferable to laminate a polyethylene-based resin as a resin layer other than the film of the embodiment.

[0064] 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. [Example]

[0065] The present invention will be explained in more detail below using examples, but the present invention is not limited to these examples.

[0066] <Film layer structure> In Example 1, three layers of HDPE 18 μm / aPE 3 μm / EVOH 4 μm were laminated and stretched in the MD direction at a stretch ratio of 5 times. 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 in the MD direction at a stretch ratio of 5 times. In Comparative Example 1, a single layer film of HDPE 25 μm thick was used. In Comparative Example 2, two layers of HDPE 20 μm / EVOH 4 μm were laminated.

[0067] In the explanation of the layer structure, the numbers in μm indicate thickness. HDPE stands for high-density polyethylene, EVOH for ethylene-vinyl alcohol copolymer, and aPE for acid-modified polyethylene resin.

[0068] <Oxygen barrier properties 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, and the oxygen gas permeability was 10cc / m 2 If it was less than 1 / day 1 / atm, it was rated as good (○), and if it was more than that, it was rated as bad (×).

[0069] <Film recyclability> The compositions obtained by melt-kneading each film were molded into single-layer films, and the cut surfaces were observed under an electron microscope and photographed. Films with no visible sea-island structure and a uniform appearance were rated as good (○), while films with a non-uniform sea-island structure were rated as poor (×).

[0070] <Film adhesion> When the film was a multilayer film, good adhesion between the layers was evaluated as good (◯), and poor adhesion between the layers was evaluated as poor (×).When the film to be evaluated was a single-layer film, it was evaluated as good (◯).

[0071] <Evaluation results> The evaluation results for Example 1 were oxygen barrier property: ◯, recyclability: ◯, and adhesion: ◯. 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: ×, recyclability: ◯, and adhesion: ◯. The evaluation results for Comparative Example 2 were: oxygen barrier property: ◯, recyclability: ×, and adhesion: ×.

[0072] The measurement results of the oxygen barrier properties of each film were 9.5 cc / m for Examples 1 and 2 and Comparative Example 2. 2 ·day·atm, but in Comparative Example 1 it was 500cc / m 2 ·day·atm or more. [Explanation of symbols]

[0073] 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

1. A film comprising a non-acid-modified polyolefin resin, an acid-modified polyolefin resin, and an ethylene-vinyl alcohol copolymer (EVOH).

2. A film 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.

3. 3. 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.

4. The film according to claim 2, wherein 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 film is laminated by coextrusion.

5. 3. The film according to claim 2, wherein the second resin layer has a thickness of 6 μm or less.

6. 3. The film according to claim 1, 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.

7. 3. The film according to claim 1, wherein the film is subjected to a stretching treatment.

8. A laminated film comprising a base film and a sealant film laminated thereon, wherein at least one of the base film and the sealant film comprises the film according to claim 1 or 2.

9. 3. A laminated film comprising the film according to claim 1 or 2, and a sealant film laminated on one side thereof via a biaxially oriented polyethylene resin layer.

10. A packaging bag, wherein at least one member is formed from the laminated film according to claim 8.

11. 11. The packaging bag according to claim 10, wherein the packaging bag is a stand-up pouch.

12. Pellets made by recycling the film according to claim 1 or 2.

13. Pellets produced by recycling the laminated film according to claim 8.

14. A recycled film made using the pellets of claim 12.

15. A recycled film made using the pellets of claim 13.

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