Extrusion Laminate Film

Abstract

To provide an extrusion laminate film capable of obtaining a laminate excellent in gas barrier property, adhesiveness, film appearance, and productivity.SOLUTION: A laminate comprising at least adjacent substrate layer / (A) layer / (B) layer / (C) layer / (D) layer / (E) layer, wherein the (A) layer and the (E) layer are polyolefin (a) and polyolefin (e), respectively satisfying (i) to (iii), (B) layer and (D) layer are respectively an adhesive resin (b) and an adhesive resin (d), (C) layer is composed of an ethylene / vinyl alcohol copolymer (c) that satisfies (iv) to (v). (i) Melt mass flow rate (MFRPO) measured according to JIS K6922-1 (1997) is 1.0 g / 10 min or more and 10.0 g / 10 min or less (ii) Fusion tension (MSPO) measured at a temperature of 190°C and a take-up speed of 10 m / min is 3 mN or more and 50 mN or less (iii) Product of MFRPO(g / 10 minute) and MSPO(mN), MFRPO×MSPO is 70 or more and 250 or less (iv) Ethylene content C2 is 50 mol% or less (v) MFREVOH measured according to ISO1133 at 190°C. is 1.0 g / 10 minutes or more and 8.0 g / 10 minutes or less.SELECTED DRAWING: None

Description

[Technical Field]

[0001] The present invention relates to an extrusion laminate film that is excellent in gas barrier properties, adhesiveness, film appearance, and productivity. [Background technology]

[0002] Ethylene-vinyl alcohol copolymer (hereinafter sometimes abbreviated as EVOH) is used in various applications as a packaging material made of thermoplastic resin for food, beverages, pharmaceuticals, etc., to prevent deterioration of the contents. EVOH has excellent gas barrier properties, aroma retention, and solvent resistance. However, EVOH is poor in lamination formability and moisture resistance, so its application to extrusion laminate film has not been practical.

[0003] In this situation, in order to improve lamination formability and moisture resistance, a method of sandwich laminating a multilayer film consisting of polyethylene, an adhesive resin, and EVOH with a polyethylene-based resin (see, for example, Patent Document 1) and a method of co-extrusion laminating a polyethylene-based resin, an acid-modified polyolefin, and EVOH (see, for example, Patent Document 2) have been proposed.

[0004] However, the former requires the molding of a multilayer film containing EVOH in a separate process, resulting in high manufacturing costs and poor productivity, while the latter uses conventional polyethylene for extrusion lamination, which has low stretchability and cannot be molded at high speed, resulting in poor productivity.

[0005] Furthermore, methods for improving the stretchability of EVOH during co-extrusion lamination include increasing the melt mass flow rate of the polyethylene or increasing the molding temperature of the polyethylene, but both methods result in migration of the polyethylene around the edges of the laminate film or large neck-in, resulting in significant edge loss and poor productivity.

[0006] Under these circumstances, there has been a demand for an extrusion laminate film that is excellent in gas barrier properties, adhesiveness, and film appearance, and that can be produced with high productivity. [Prior art documents] [Patent documents]

[0007] [Patent Document 1] Japanese Patent Application Laid-Open No. 1992-234645 [Patent Document 2] Japanese Patent Application Laid-Open No. 2001-322624 Summary of the Invention [Problem to be solved by the invention]

[0008] The present invention has been made in view of the above circumstances, and has as its object to provide an extrusion laminate film that exhibits excellent gas barrier properties, adhesiveness, film appearance, and productivity. [Means for solving the problem]

[0009] As a result of intensive research to solve the above problems, the inventors of the present invention discovered that a specific extrusion laminate film exhibits excellent gas barrier properties, adhesiveness, film appearance, and productivity, and thus completed the present invention.

[0010] That is, the present invention relates to an extrusion laminate film that is a laminate comprising at least a base layer / (A) layer / (B) layer / (C) layer / (D) layer / (E) layer that are adjacent to each other, wherein the (A) layer and the (E) layer are composed of polyolefin (a) and polyolefin (e) that satisfy (i) to (iii), the (B) layer and the (D) layer are composed of adhesive resin (b) and adhesive resin (d), and the (C) layer is composed of ethylene-vinyl alcohol copolymer (c) that satisfies (iv) to (v). (i) Melt mass flow rate (MFR) measured according to JIS K6922-1 (1997) PO ) is 1.0g / 10min or more and 10.0g / 10min or less (ii) Melt tension (MS) measured at a temperature of 190°C and a take-up speed of 10 m / min PO ) is 3mN or more and 50mN or less (iii) MFR PO (g / 10 min) and MS PO (mN) product MFR PO ×MS PO is between 70 and 250 (iv) Ethylene content C2 is 50 mol% or less (v) MFR at 190°C measured according to ISO 1133 EVOH is 1.0g / 10min or more and 8.0g / 10min or less [Effects of the Invention]

[0011] According to the present invention, it is possible to provide a laminate excellent in adhesiveness, film appearance, and productivity. [Brief explanation of the drawings]

[0012] [Figure 1] FIG. 2 is a diagram showing the relationship between C2 and DEVOH in formula (1). DETAILED DESCRIPTION OF THE INVENTION

[0013] The extrusion laminate film, which is one embodiment of the present invention, will be described in detail below.

[0014] The present invention relates to an extrusion laminate film, which is a laminate comprising at least a base layer / (A) layer / (B) layer / (C) layer / (D) layer / (E) layer, which are adjacent to each other, wherein the (A) layer and the (E) layer are composed of polyolefin (a) and polyolefin (e) satisfying (i) to (iii), the (B) layer and the (D) layer are composed of adhesive resin (b) and adhesive resin (d), and the (C) layer is composed of ethylene-vinyl alcohol copolymer (c) satisfying (iv) to (v). (i) Melt mass flow rate (MFR) measured according to JIS K6922-1 (1997) PO ) is 1.0g / 10min or more and 10.0g / 10min or less (ii) Melt tension (MS) measured at a temperature of 190°C and a take-up speed of 10 m / min PO ) is 3mN or more and 50mN or less (iii) MFR PO (g / 10 min) and MS PO (mN) product MFR PO ×MS PO is between 70 and 250 (iv) Ethylene content C2 is 50 mol% or less (v) MFR at 190°C measured according to ISO 1133 EVOH is 1.0g / 10min or more and 8.0g / 10min or less

[0015] In the extrusion laminate film of the present invention, Layer (A) and Layer (E) are composed of polyolefin (a) and polyolefin (e), respectively, where the polyolefin (a) constituting Layer (A) and the polyolefin (e) constituting Layer (E) may independently be the same or different.

[0016] The polyolefins (a) and (e) are not particularly limited and include homopolymers or copolymers of α-olefins having 2 to 12 carbon atoms, such as ethylene, propylene, and 1-butene, and copolymers of these α-olefins, and copolymers of ethylene with vinyl esters and / or acrylic esters. More specific examples include ethylene homopolymers such as high-pressure low-density polyethylene and high-density polyethylene, ethylene-1-butene copolymers, ethylene-1-hexene copolymers, ethylene-1-octene copolymers, ethylene-4-methyl-1-pentene copolymers, ethylene-vinyl acetate copolymers, ethylene-acrylic ester copolymers, and ethylene-methacrylic ester copolymers, propylene homopolymers, propylene-ethylene copolymers, propylene-1-butene copolymers, poly-1-butene, poly-1-hexene, and poly-4-methyl-1-pentene. The polyolefins (a) may be used alone or in combination of two or more. Among these, low-density polyethylene is preferred from the viewpoint of moldability.

[0017] Such low density polyethylene is composed of high pressure low density polyethylene, linear low density polyethylene, or a composition thereof.

[0018] An example of a method for producing high-pressure low-density polyethylene is high-pressure radical polymerization, and such a resin can be conveniently selected from commercially available products, such as those sold by Tosoh Corporation under the trade name Petrothene.

[0019] Linear low-density polyethylene can be obtained by copolymerizing ethylene and α-olefins using high-, medium-, or low-pressure ionic polymerization methods with Ziegler-Natta, Phillips, or metallocene catalysts.

[0020] Examples of the α-olefin used in the linear low-density polyethylene include propylene, 1-butene, 4-methyl-1-pentene, 3-methyl-1-butene, 1-pentene, 1-hexene, 1-heptene, 1-octene, 1-nonene, 1-decene, 1-undecene, and 1-dodecene, and one or more of these may be used.

[0021] Such linear low-density polyethylene can be conveniently selected from commercially available products, such as those available from Tosoh Corporation under the trade names Nipolon-L, Nipolon-Z, and Lumitack.

[0022] The melt mass flow rates (hereinafter referred to as "MFR") of the polyolefins (a) and (e) constituting the present invention measured according to JIS K6922-1 (1997) are PO ") is in the range of 1.0 g / 10 min or more and 10.0 g / 10 min or less, more preferably 1.0 g / 10 min or more and 6.0 g / 10 min or less, and most preferably 3.0 g / 10 min or more and 5.0 g / 10 min or less, because this provides excellent productivity. PO A range of less than 1.0 g / 10 min is undesirable because stretchability is poor, and a range of more than 10.0 g / min is undesirable because migration becomes large.

[0023] The melt tension (hereinafter referred to as "MS") of the polyolefin (a) and polyolefin (e) constituting the present invention measured at a temperature of 190°C and a take-up speed of 10 m / min was also measured. PO ") is in the range of 3 mN or more and 50 mN or less, more preferably 10 mN or more and 45 mN or less, and most preferably 15 mN or more and 40 mN or less, in order to achieve excellent productivity. PO If the tension is less than 3 mN, lamination processability will be poor, which is not preferred, and if it exceeds 50 mN, stretchability will be poor, which is not preferred.

[0024] MS in the present invention PO is a value measured at an extrusion speed of 10 m / min, a take-up speed of 10 m / min, and a set temperature of 190°C using a capillary viscometer with a barrel diameter of 9.55 mm, equipped with a die having a length of 8 mm, a diameter of 2.095 mm, and an inlet angle of 90°, and equipped with a heat-retaining chamber.

[0025] MFR of polyolefin (a) and polyolefin (e) constituting the present invention PO (g / 10 min) and MS PO (mN) product MFR PO ×MS PO In view of excellent productivity, the MFR is in the range of 70 to 250, more preferably 70 to 200, and most preferably 90 to 160. PO ×MS PO If the value is less than 70, lamination processability will be poor, which is not preferred, and if it exceeds 250, stretchability will be poor, which is not preferred.

[0026] The density of polyolefin (a) and polyolefin (e) measured according to JIS K6922-1 (1997) (hereinafter simply referred to as density) is not particularly limited, and since they have excellent moldability, they are preferably 910 to 930 kg / m 3 is preferably in the range of 914 to 925 kg / m 3 The range is.

[0027] The polyolefin (a) and polyolefin (e) in the present invention may be blended with other thermoplastic resins as long as the object is achieved.

[0028] When mixing the thermoplastic resin with the polyolefin (a) and polyolefin (e) constituting the laminate of the present invention, a pellet mixture obtained by mixing polyolefin pellets and thermoplastic resin pellets in a solid state may be used, but a mixture melt-kneaded using a single-screw extruder, twin-screw extruder, kneader, Banbury extruder, etc. is preferred because it provides a product of stable quality. When using a melt-kneading device, the melting temperature is preferably from the melting point of the polyolefin to about 300°C.

[0029] Furthermore, if necessary, additives commonly used in polyolefin resins, such as antioxidants, light stabilizers, antistatic agents, lubricants, and antiblocking agents, may be added to the polyolefin (a) and polyolefin (e) constituting the laminate of the present invention, within the scope of not impairing the object of the present invention.

[0030] In the extrusion laminate film of the present invention, the (B) layer and the (D) layer are composed of adhesive resin (b) and adhesive resin (d), respectively. Here, the adhesive resin (b) constituting the (B) layer and the adhesive resin (d) constituting the (D) layer may independently be the same or different.

[0031] The adhesive resins (b) and (d) are not particularly limited as long as the intended purpose is achieved, and examples thereof include known adhesive resins used in molding applications. Examples of such adhesive resins include acid-modified polyolefins modified with unsaturated carboxylic acids such as maleic acid or maleic anhydride, or their anhydrides, or boronic acids; homopolymers of α-olefins having 2 to 12 carbon atoms such as ethylene, propylene, and 1-butene, such as polyamide-grafted polyolefins, or modified copolymers thereof; copolymers of ethylene and unsaturated carboxylic acid esters such as vinyl esters and / or acrylic acid esters, methacrylic acid esters, and glycidyl methacrylate; saponified ethylene-vinyl ester copolymers; and copolymers of ethylene and unsaturated carboxylic acids such as acrylic acid and methacrylic acid. Among these, from the standpoints of adhesion and cost, it is preferable to use at least maleic anhydride-modified polyolefins (hereinafter sometimes abbreviated as "MAH-PE").

[0032] Such maleic anhydride-modified polyolefins are not particularly limited, and may be copolymers of olefin components and maleic anhydride, or may be polyolefins graft-modified with maleic anhydride. Furthermore, there are no particular limitations on the method for producing such resins.

[0033] The olefin component constituting the maleic anhydride-modified polyolefin is not particularly limited, and examples thereof include ethylene, propylene, 1-butene, 1-hexene, 1-octene, vinyl esters such as vinyl acetate and vinyl benzoate, acrylic acid, methacrylic acid, acrylic acid esters such as methyl acrylate and ethyl acrylate, methacrylic acid esters such as methyl methacrylate, ethyl methacrylate and glycidyl methacrylate, and unsaturated carboxylic acids such as acrylic acid and methacrylic acid, and these may be used alone or in combination of two or more.

[0034] The maleic anhydride content of such maleic anhydride-modified polyolefin is preferably 0.10 to 1.2% by weight, more preferably 0.40 to 1.0% by weight, and most preferably 0.40 to 0.80% by weight, as this provides excellent adhesiveness and film appearance.

[0035] Such resins can be conveniently selected from commercially available products, and for example, copolymers of olefin components and maleic anhydride are commercially available from Dow Chemical Japan Co., Ltd. under the trade name Amplify, and from SK Sogo Chemical Japan Co., Ltd. under the trade names Rotader, Bondine, and OREVAC T. Furthermore, polyolefins grafted with maleic anhydride are commercially available from Mitsui Chemicals, Inc. under the trade name Admer and Modic, from Dow Chemical Japan Co., Ltd. under the trade name Fusabond, from SK Sogo Chemical Japan Co., Ltd. under the trade name OREVAC G, and from Addivant Japan LLC under the trade name Polybond.

[0036] From the viewpoints of adhesiveness and film appearance, the adhesive resin (b) and the adhesive resin (d) are preferably polyolefin compositions containing at least a polyolefin and a maleic anhydride-modified polyolefin.

[0037] From the viewpoints of adhesiveness and film appearance, the polyolefin composition contains 50 to 90 parts by weight of polyolefin and 10 to 50 parts by weight of maleic anhydride-modified polyolefin (total of polyolefin and maleic anhydride-modified polyolefin is 100 parts by weight), and more preferably contains 65 to 85 parts by weight of polyolefin and 15 to 35 parts by weight of maleic anhydride-modified polyolefin (total of polyolefin and maleic anhydride-modified polyolefin is 100 parts by weight).

[0038] The polyolefin is not particularly limited, and examples thereof include homopolymers of α-olefins having 2 to 12 carbon atoms such as ethylene, propylene, and 1-butene, copolymers thereof, and copolymers of ethylene with vinyl esters and / or acrylic esters.

[0039] Examples of suitable polyolefins include ethylene homopolymers such as high-pressure low-density polyethylene and high-density polyethylene, ethylene-based polymers such as ethylene-1-butene copolymers, ethylene-1-hexene copolymers, ethylene-1-octene copolymers, ethylene-4-methyl-1-pentene copolymers, ethylene-vinyl acetate copolymers, ethylene-acrylate copolymers, and ethylene-methacrylate copolymers, propylene homopolymers, propylene-ethylene copolymers, propylene-1-butene copolymers, poly-1-butene, poly-1-hexene, and poly-4-methyl-1-pentene. Polyolefins may be used singly or in combination of two or more. Among these, at least one selected from the group consisting of high-pressure low-density polyethylene, ethylene-vinyl acetate copolymers, high-density polyethylene, ethylene-1-butene copolymers, ethylene-1-hexene copolymers, and polypropylene is preferred from the standpoint of moldability, and these compositions are most preferred due to their excellent moldability.

[0040] High-pressure radical polymerization can be used as a method for producing high-pressure low-density polyethylene, and such resins can be conveniently selected from commercially available products, such as those available from Tosoh Corporation under the trade name Petrocene. Methods for producing high-density polyethylene, ethylene-1-butene copolymers, and ethylene-1-hexene copolymers are not particularly limited, and examples include high-, medium-, or low-pressure ionic polymerization methods using Ziegler-Natta catalysts, Phillips catalysts, or metallocene catalysts, and such resins can be conveniently selected from commercially available products, such as those available from Tosoh Corporation under the trade names Nipolon Hard, Nipolon-L, Nipolon-Z, and Lumitac.

[0041] The method for producing ethylene-vinyl acetate copolymer is not particularly limited, but examples include well-known production methods such as high-pressure radical polymerization, solution polymerization, and latex polymerization. Such resins can be conveniently selected from commercially available products, and ethylene-vinyl acetate copolymers are commercially available from Tosoh Corporation under the trade name Ultrathene.

[0042] The method for mixing such a polyolefin composition is not particularly limited, and a pellet mixture in which polyolefin pellets and maleic anhydride-modified polyolefin pellets are mixed in a solid state may be used, but a melt-kneaded mixture is preferred from the viewpoint of quality stability.

[0043] The melt-kneading method is not particularly limited as long as it can uniformly disperse each component, and can be produced using a melt-kneading device that is commonly used for resin mixing. Examples of melt-kneading devices include a single-screw extruder, a multi-screw extruder, a Banbury mixer, a pressure kneader, a rotary roll, and a Labo Plastomill. The melting temperature is preferably from the melting point of the polyolefin to about 260°C.

[0044] The melt mass flow rates (hereinafter referred to as "MFR") of the adhesive resins (b) and (d) constituting the present invention were measured according to JIS K6922-1 (1997). ADD ") is preferably in the range of 1.0 g / 10 min or more and 10.0 g / 10 min or less, more preferably 1.0 g / 10 min or more and 6.0 g / 10 min or less, and most preferably 3.0 g / 10 min or more and 5.0 g / 10 min or less, because this provides excellent productivity.

[0045] The adhesive resin (b) and adhesive resin (d) constituting the present invention were measured at a temperature of 190°C and a take-up speed of 10 m / min. The melt tension (hereinafter referred to as "MS ADD ") is preferably in the range of 3 mN or more and 50 mN or less, more preferably 10 mN or more and 45 mN or less, and most preferably 15 mN or more and 40 mN or less, in order to achieve excellent productivity.

[0046] MS in the present invention ADD is a value measured at an extrusion speed of 10 m / min, a take-up speed of 10 m / min, and a set temperature of 190°C using a capillary viscometer with a barrel diameter of 9.55 mm, equipped with a die having a length of 8 mm, a diameter of 2.095 mm, and an inlet angle of 90°, and equipped with a heat-retaining chamber.

[0047] MFR of adhesive resin (b) and adhesive resin (d) constituting the present invention ADD(g / 10 min) and MS ADD (mN) product MFR ADD ×MS ADD In view of excellent productivity, the range of 70 or more and 250 or less is preferable, the range of 70 or more and 200 or less is more preferable, and the range of 90 or more and 160 or less is most preferable.

[0048] The adhesive resin (b) and adhesive resin (d) constituting the present invention may contain other thermoplastic resins as long as the present object is achieved. When mixing the thermoplastic resin with the adhesive resin (b) and adhesive resin (d) constituting the present invention, a pellet mixture obtained by mixing pellets of a polyolefin composition and pellets of a thermoplastic resin in a solid state may be used, but a mixture melt-kneaded using a single-screw extruder, twin-screw extruder, kneader, Banbury extruder, etc. is preferred because it produces a product of stable quality. When using a melt-kneading device, the melting temperature is preferably from the melting point of the polyolefin composition to about 300°C.

[0049] Furthermore, if necessary, additives commonly used in polyolefin resins, such as antioxidants, light stabilizers, antistatic agents, lubricants, and antiblocking agents, may be added to the adhesive resin (b) and adhesive resin (d) constituting the present invention, within the scope that does not impair the object of the present invention.

[0050] The ethylene content C2 of the ethylene-vinyl alcohol copolymer (c) constituting the present invention is 50 mol % or less, preferably 20 to 35 mol %, because it has excellent gas barrier properties. This further improves the gas barrier properties. Here, C2 (mol %) refers to the content of ethylene components in the monomer units contained in the ethylene-vinyl alcohol copolymer (c).

[0051] There are no particular limitations on the method for producing the ethylene-vinyl alcohol copolymer (c). For example, a copolymer of ethylene and a fatty acid vinyl ester can be produced according to a known method, and then EVOH can be produced by hydrolyzing the copolymer.

[0052] In addition to ethylene units and vinyl alcohol units, EVOH may contain small amounts of other structural units.

[0053] Such resins can be conveniently selected from commercially available products, and are commercially available, for example, under the trade names EVAL from Kuraray Co., Ltd., and Soarnol and G-Soarnol from Mitsubishi Chemical Corporation.

[0054] The melt mass flow rate of such ethylene-vinyl alcohol copolymer (c) at 190°C (temperature: 190°C, load: 2.16 kg, hereinafter referred to as "MFR") measured in accordance with ISO 1133 EVOH From the viewpoint of formability and film appearance, the MFR is in the range of 1.0 g / 10 min or more and 8.0 g / 10 min or less, more preferably 1.0 g / 10 min or more and 6.0 g / 10 min or less, and most preferably 1.0 g / 10 min or more and 3.0 g / 10 min or less. EVOH A stretching rate of less than 1.0 g / 10 min is undesirable because of poor stretchability, and a stretching rate of more than 8.0 g / min is undesirable because of poor film appearance.

[0055] Furthermore, the melt mass flow rate of the ethylene-vinyl alcohol copolymer (c) at 210°C (temperature 210°C, load 2.16 kg) measured in accordance with ISO 1133 is preferably in the range of 2.5 to 20.0 g / 10 min, more preferably 2.5 to 15.0 g / 10 min, and most preferably 2.5 to 7.5 g / 10 min, from the viewpoints of formability and film appearance.

[0056] The density of ethylene-vinyl alcohol copolymer (c) at 20°C measured in accordance with ISO1183-3 (hereinafter referred to as "D EVOH ") is 1190 kg / m from the viewpoint of film appearance and adhesiveness. 3 Less than 1100-1180 kg / m is preferable. 3 More preferably, it is 1140 to 1180 kg / m 3 It is most preferable that:

[0057] In addition, the ethylene content C2 (mol%) and density D of the ethylene-vinyl alcohol copolymer (c) were found to be excellent in terms of film appearance and adhesiveness. EVOH (kg / m 3 ) preferably satisfies the following formula (1), and more preferably satisfies the following formula (2): D EVOH <-4.265×C2+1325 (1) D EVOH <-4.265×C2+1315 (2)

[0058] In the extrusion laminate film of the present invention, from the viewpoint of migration, the MFR of the ethylene-vinyl alcohol copolymer (c) is EVOH MFR of polyolefin (a) versus (g / 10 min) PO (g / 10 min) and MFR of adhesive resin (b) ADD (g / 10 min) Root Mean Square [(MFR PO 2 +MFR ADD 2 ) / 2] 0.5 Ratio of RT MFR is preferably in the range of 0.20 or more and 5.0 or less, more preferably in the range of 0.25 or more and 4.0 or less, and most preferably in the range of 0.4 or more and 2.5 or less. This makes it possible to reduce migration and provides excellent productivity.

[0059] The substrate layer constituting the present invention is not particularly limited and can be selected appropriately depending on the application. Examples include layers formed from synthetic polymers, woven fabrics, nonwoven fabrics, metal foils, paper, cellophane, etc. Examples include layers formed from synthetic polymers such as polyester resins such as polyethylene terephthalate and polybutylene terephthalate, polyamide resins such as nylon 6 and nylon 66, polyethylene resins such as high-density polyethylene, low-density polyethylene, linear low-density polyethylene, ethylene-ethyl acrylate copolymer, ethylene-methacrylic acid copolymer, ethylene-vinyl acetate copolymer, ethylene-vinyl alcohol copolymer, and ionomer, polypropylene resins, polybutene, acrylic resins, polyvinyl alcohol, polymethylpentene, polyvinyl chloride, polyvinylidene chloride, polystyrene, polycarbonate, polyurethane, and cellulose resins. The synthetic polymer constituting the substrate layer may be the same as or different from the polyolefin (a) and polyolefin (e). Furthermore, these polymer films and sheets may be further treated with aluminum vapor deposition, alumina vapor deposition, silicon dioxide vapor deposition, or acrylic. These polymer films and sheets may also be printed with urethane ink, etc. Examples of metal foils include aluminum foil and copper foil, and examples of paper include kraft paper, fine paper, stretched paper, glassine paper, and paperboard such as cup base paper and photographic paper base paper. These substrates may be used alone or in combination of two or more.

[0060] The laminate of the present invention is characterized by comprising at least adjacent layers: base layer / (A) layer / (B) layer / (C) layer / (D) layer / (E), and may also comprise other layers, such as layer (F). Specific examples include base layer / (A) layer / (B) layer / (C) layer / (D) layer / (E), layer (F) / base layer / (A) layer / (B) layer / (C) layer / (D) layer / (E), and base layer / (A) layer / (B) layer / (C) layer / (D) layer / (E) layer. The symbol / between layers indicates that the layers are adjacent.

[0061] Examples of Layer (F) include layers formed from synthetic polymers, woven fabrics, nonwoven fabrics, metal foils, paper, cellophane, etc. Examples include layers formed from synthetic polymers, such as polyester resins (e.g., polyethylene terephthalate, polybutylene terephthalate), polyamide resins (e.g., nylon 6, nylon 66), polyethylene resins (e.g., high-density polyethylene, low-density polyethylene, linear low-density polyethylene, ethylene-ethyl acrylate copolymer, ethylene-methacrylic acid copolymer, ethylene-vinyl acetate copolymer, ethylene-vinyl alcohol copolymer, ionomer), polypropylene resins, polybutene, acrylic resins, polyvinyl alcohol, polymethylpentene, polyvinyl chloride, polyvinylidene chloride, polystyrene, polycarbonate, polyurethane, and cellulose resins. Furthermore, these polymer films and sheets may be further treated with aluminum vapor deposition, alumina vapor deposition, silicon dioxide vapor deposition, or acrylic. Furthermore, these polymer films and sheets may be further printed with urethane ink, etc. Examples of metal foils include aluminum foil and copper foil, and examples of papers include kraft paper, fine paper, stretch paper, glassine paper, and paperboard such as cup base paper and photographic paper base paper.

[0062] In the extrusion laminate film of the present invention, it is preferred that the polyolefin (a) and polyolefin (e) constituting the (A) layer and the (E) layer are the same component, and that the adhesive resin (b) and adhesive resin (d) constituting the (B) layer and the (D) layer are the same component.

[0063] The extrusion lamination method for obtaining the laminate of the present invention is not particularly limited, and examples include various extrusion lamination methods such as tandem lamination, in which each layer is laminated in order, and coextrusion lamination, in which several layers are laminated simultaneously. Among these, from the viewpoint of cost, it is preferable to simultaneously form Layer (A), Layer (B), Layer (C), Layer (D), and Layer (E) by coextrusion lamination. Furthermore, the most preferred method is a three-kind, five-layer extrusion lamination method in which Layer (A) and Layer (E) are made of the same component, and Layer (B) and Layer (D) are made of the same component. In such an extrusion lamination method, the resin temperature is preferably in the range of 180 to 280°C, and the surface temperature of the cooling roll is preferably in the range of 10 to 50°C.

[0064] In addition, in extrusion lamination, immediately after forming the polyolefin (a) constituting the (A) layer adjacent to the substrate layer into an extruded layer in a molten state, the substrate adhesive surface of the layer is exposed to an oxygen-containing gas or an ozone-containing gas, and then the layer is laminated to the substrate, which is preferable because it provides excellent adhesion to the substrate layer. When improving the adhesion between the thermoplastic resin and the substrate by using an ozone-containing gas, the amount of ozone gas to be treated is 1 / m of the film made of the thermoplastic resin extruded from the die. 2 It is preferable to spray 0.5 mg or more of ozone per 1000 particles.

[0065] In the extrusion lamination method for obtaining the laminate of the present invention, in order to further improve the adhesion between the thermoplastic resin layer and the substrate layer, heat treatment can be performed for 10 hours or more at a temperature at which the resin of each layer does not foam, for example, a temperature of 30°C to 60°C. If necessary, the adhesive surface of the substrate layer may be subjected to a known surface treatment such as corona treatment, flame treatment, or plasma treatment. If necessary, an anchor coating agent may be applied to the substrate layer.

[0066] The extrusion laminated film of the present invention has excellent film appearance, adhesiveness, and gas barrier properties against oxygen and the like, and can be suitably used for packaging materials and containers made of thermoplastic resins for foods, beverages, pharmaceuticals, etc., which require these properties. [Example]

[0067] The present invention will be described below with reference to examples and comparative examples, but the present invention is not limited to these.

[0068] (1) Melt mass flow rate (MFR) The MFR was measured in accordance with JIS K6922-1 (1997) or ISO1133. (2) Density The density was measured in accordance with JIS K6922-1 (1997) or ISO1183-3.

[0069] (3) Melt tension (MS) In a thermostatic chamber set to 23°C, the temperature was set to 190°C, and 18 g of polyolefin or adhesive resin was filled into a capillary viscometer (Toyo Seiki Seisakusho, product name: Capilograph) with a barrel diameter of 9.55 mm, equipped with a die having a length of 8 mm, a diameter of 2.095 mm, and an inlet angle of 90°, and a heat-retaining chamber. The piston descending speed was set to 10 mm / min, and the take-up speed was set to 10 m / min, and the load (mN) required for take-up was measured as the melt tension (MS).

[0070] (4) Film appearance The film appearance was evaluated by visually inspecting the molten film extruded from the T-die at a processing speed of 50 m / min to obtain the thicknesses (10 / 5 / 5 / 5 / 10 μm) described in the examples. A rating of × was given when unevenness in appearance occurred due to gelation at the interface between the EVOH and the polyolefin composition; △ when there was no unevenness in appearance due to gelation but the film was opaque; ◯ when there was no unevenness in appearance and the film was transparent but had many fisheyes; and ◎ when there was no unevenness in appearance and the film was transparent and had few fisheyes. A rating of △ to ◎ indicated that the film appearance was good.

[0071] (5) Migration The rotation speed of each extruder was set to obtain the thicknesses (10 / 5 / 5 / 5 / 10 μm) described in the examples at a processing speed of 50 m / min, and the molten film extruded from the T-die was visually measured. The molten film immediately below the die was observed, and the width of the EVOH layer that had not wrapped around at both ends of the molten film was measured. The sum of the widths at both ends of the molten film was taken as the migration (mm). The smaller the migration, the better the productivity, and a value of less than 70 was considered good.

[0072] (6) Maximum processing speed / stretchability The maximum processing speed was determined by increasing the rotation speed and processing speed of each extruder in conjunction with each other so that the thickness of the extruded laminate film would be the thickness described in the examples (10 / 5 / 5 / 5 / 10 μm), and the processing speed at which the film broke was defined as the maximum processing speed (m / min). The higher the maximum processing speed, the better the stretchability and productivity. A maximum processing speed of less than 50 was rated as "X", 50 to 75 was rated as "△", 75 to 100 was rated as "〇", and 100 or more was rated as "◎". Stretchability was determined to be good when rated as "△" to "◎". In addition, when resonance occurred and lamination processing was not possible, the stretchability was also determined to be "X".

[0073] (7) Neck-in The difference between the T-die opening width of the extrusion lamination molding machine and the coating width of the extrusion laminate film obtained in the examples was taken as neck-in, and this value (mm) was measured. The smaller the neck-in, the better the productivity.

[0074] (8) Seal strength / interlayer adhesion The extrusion laminate film obtained in the examples was cut into two pieces measuring 100 mm wide and 100 mm long. The (E) layers of the laminate film were then placed together and heat-sealed using a heat seal tester TP-701B (manufactured by Tester Sangyo Co., Ltd.) with a set temperature of 160°C, double-sided heating, air pressure of 0.2 MPa, and a sealing time of 1 second using a 10 mm wide, 300 mm long seal bar. This test piece was cut into a 15 mm wide piece and subjected to a peel test using a tensile tester Tensilon RTE-1210 (manufactured by Orientec Co., Ltd.) at a tensile speed of 300 mm / min and T-peel, to measure the seal strength (N / 15 mm). The higher the seal strength, the better the interlayer adhesion.

[0075] Example 1 The polyolefin (A) constituting the (A) layer and the (E) layer is MFR PO is 8.0g / 10min, density is 925kg / m 3 , M.S. PO The adhesive resin (B) constituting the (B) layer and the (D) layer was 80 parts by weight of a polyolefin (A1) having an MFR of 7.0 g / 10 min and a density of 930 kg / m. 3 20 parts by weight of maleic anhydride-modified polyethylene (manufactured by SK Sogo Chemical Japan Co., Ltd., trade name OREVAC G OE850, M1) having an MAH content of 0.60% by weight was blended, and the resulting mixture was melt-kneaded at a resin temperature of 160°C in a single-screw extruder (manufactured by Placo Co., Ltd., diameter 40 mm) to obtain a polyolefin resin composition (MFR ADD 7.8g / 10min, density 926kg / m 3 , M.S. ADD 31 mN, MAH content 0.12 wt%) (B1) was used as the ethylene-vinyl alcohol copolymer (C) constituting the (C) layer. EVOH 2.0g / 10min, ethylene content 32mol%, density 1160kg / m 3 an ethylene-vinyl alcohol copolymer (manufactured by Kuraray Co., Ltd., product name EVAL SP482B) (C1) having a MFR of 4.1 g / 10 min at 210 °C; 2 Kraft paper (manufactured by Chuetsu Package Co., Ltd., unbleached kraft paper) was used.

[0076] First, (A1) was fed into a single-screw extruder (manufactured by Sumitomo Heavy Industries Modern Co., Ltd.) with a 40 mm diameter screw set at 260°C, (B1) was fed into a single-screw extruder (manufactured by Sumitomo Heavy Industries Modern Co., Ltd.) with a 40 mm diameter screw set at 260°C, and (C1) was fed into a single-screw extruder (manufactured by Sumitomo Heavy Industries Modern Co., Ltd.) with a 40 mm diameter screw set at 260°C. They were extruded through a T-die at a processing speed of 50 m / min and an extrusion rotation speed set so that the thicknesses of (A1), (B1), (C1), (B1), and (A1) were 10 μm, 5 μm, 5 μm, 5 μm, and 10 μm, respectively, and the resulting molten film was evaluated for migration and film appearance. Next, three types of five-layer extrusion lamination molding was started on kraft paper at a processing speed of 20 m / min and an air gap length of 110 mm, so that (A1), (B1), (C1), (B1), and (A1) had thicknesses of 10 μm, 5 μm, 5 μm, 5 μm, and 10 μm, respectively.The extrusion rotation speed and processing speed were increased in tandem to evaluate the maximum processing speed. Then, a 5-layer extrusion laminate of three materials was formed on kraft paper at a processing speed of 50 m / min with an air gap length of 110 mm, with thicknesses of (A1), (B1), (C1), (B1), and (A1) of 10 μm, 5 μm, 5 μm, 5 μm, and 10 μm, respectively. This resulted in an extrusion laminate film consisting of kraft paper, polyolefin (A1) ((A) layer), adhesive resin (B1) ((B) layer), ethylene-vinyl alcohol copolymer (C1) ((C) layer), adhesive resin (B1) ((D) layer), and polyolefin (A1) ((E) layer). The resulting extrusion laminate film was evaluated for film appearance, migration, neck-in, and seal strength. The results are shown in Table 1.

[0077] Example 2 The polyolefin (A) constituting the layers (A) and (E) has an MFR of 3.7 g / 10 min and a density of 923 kg / m 3 30 parts by weight of high-pressure low-density polyethylene (manufactured by Tosoh Corporation, trade name Petrothene 225), MFR 4.0 g / 10 min, density 922 kg / m 3A low-density polyethylene composition (MFR) was prepared by melt-kneading the mixture at a resin temperature of 160°C in a single-screw extruder (manufactured by Placo Corporation, diameter 40 mm) with 70 parts by weight of high-pressure low-density polyethylene (Petrothene 190, product name, manufactured by Tosoh Corporation). PO 3.9g / 10min, density 922kg / m 3 , M.S. PO 33 mN) (A2) was blended with 80 parts by weight of polyolefin (A2) and 20 parts by weight of maleic anhydride-modified polyethylene (M1) as adhesive resin (B) constituting layers (B) and (D), and melt-kneaded at a resin temperature of 160°C in a single-screw extruder (manufactured by Placo Co., Ltd., diameter 40 mm) to obtain a polyolefin resin composition (MFR ADD 4.4g / 10min, density 924kg / m 3 , M.S. ADD Except for using a polymer film with a viscosity of 33 mN and an MAH content of 0.12 wt% (B2), migration, film appearance, and maximum processing speed were evaluated in the same manner as in Example 1, and then an extrusion laminate film was obtained. The obtained extrusion laminate film was used to evaluate neck-in and seal strength. The results are shown in Table 1.

[0078] Example 3 The polyolefin (A) constituting the layers (A) and (E) has an MFR of 1.6 g / 10 min and a density of 919 kg / m 3 50 parts by weight of high-pressure low-density polyethylene (manufactured by Tosoh Corporation, trade name Petrothene 360), MFR 4.0 g / 10 min, density 905 kg / m 3 A polyolefin resin composition (MFR) was prepared by blending 50 parts by weight of linear low-density polyethylene (manufactured by Tosoh Corporation, trade name Nipolon-Z HF310R) and melt-kneading it at a resin temperature of 160°C in a single-screw extruder (manufactured by Placo Corporation, caliber 40 mm). PO 2.5g / 10min, density 912kg / m 3 , M.S. PO43 mN) (A3) was blended with 80 parts by weight of polyolefin (A3) and 20 parts by weight of maleic anhydride-modified polyethylene (M1) as adhesive resin (B) constituting layers (B) and (D), and melt-kneaded at a resin temperature of 160°C in a single-screw extruder (manufactured by Placo Co., Ltd., diameter 40 mm) to obtain a polyolefin resin composition (MFR ADD 3.1g / 10min, density 916kg / m 3 , M.S. ADD Except for using a polymer film with a viscosity of 41 mN and an MAH content of 0.12 wt% (B3), migration, film appearance, and maximum processing speed were evaluated in the same manner as in Example 1, and then an extrusion laminate film was obtained. The obtained extrusion laminate film was used to evaluate neck-in and seal strength. The results are shown in Table 1.

[0079] Example 4 The polyolefin (A) constituting the layers (A) and (E) has an MFR of 3.7 g / 10 min and a density of 923 kg / m 3 70 parts by weight of high-pressure low-density polyethylene (manufactured by Tosoh Corporation, trade name Petrothene 225), MFR 4.0 g / 10 min, density 922 kg / m 3 The mixture was blended with 30 parts by weight of a high-pressure low-density polyethylene (trade name: Petrothene 190, manufactured by Tosoh Corporation), and melt-kneaded at a resin temperature of 160°C in a single-screw extruder (manufactured by Placo Corporation, caliber 40 mm) to give a low-density polyethylene composition (MFR PO 3.8g / 10min, density 923kg / m 3 , M.S. PO 46 mN) (A4) was blended with 80 parts by weight of polyolefin (A4) and 20 parts by weight of maleic anhydride-modified polyethylene (M1) as adhesive resin (B) constituting layers (B) and (D), and melt-kneaded at a resin temperature of 160°C in a single-screw extruder (manufactured by Placo Co., Ltd., diameter 40 mm) to obtain a polyolefin resin composition (MFR ADD 4.3g / 10min, density 924kg / m 3 , M.S. ADDExcept for using a polymer film with a viscosity of 43 mN and an MAH content of 0.12 wt% (B4), migration, film appearance, and maximum processing speed were evaluated in the same manner as in Example 1, and then an extrusion laminate film was obtained. The obtained extrusion laminate film was used to evaluate neck-in and seal strength. The results are shown in Table 1.

[0080] Example 5 The polyolefin (A) constituting the (A) layer and the (E) layer is MFR PO is 4.0g / 10min, density is 922kg / m 3 , M.S. PO A polyolefin resin composition (MFR) was prepared by blending 80 parts by weight of a high-pressure low-density polyethylene (Petrothene 190, manufactured by Tosoh Corporation) (A5) having a viscosity of 20 mN as the adhesive resin (B) constituting the (B) layer and the (D) layer with 20 parts by weight of a maleic anhydride-modified polyethylene (M1). The resulting mixture was melt-kneaded at a resin temperature of 160°C in a single-screw extruder (Placo Corporation, 40 mm diameter). ADD 4.5g / 10min, density 924kg / m 3 , M.S. ADD Except for using a 22 mN copolymer (B5) with an MAH content of 0.12 wt%, migration, film appearance, and maximum processing speed were evaluated in the same manner as in Example 1, and then an extrusion laminate film was obtained. The resulting extrusion laminate film was evaluated for neck-in and seal strength. The results are shown in Table 1.

[0081] Example 6 The adhesive resin (B) constituting the (B) layer and the (D) layer has an MFR of 13.0 g / 10 min and a density of 919 kg / m 3 A polyolefin resin composition (MFR) was prepared by blending 80 parts by weight of high-pressure low-density polyethylene (manufactured by Tosoh Corporation under the trade name of Petrothene 212) and 20 parts by weight of maleic anhydride-modified polyethylene (M1), and melt-kneading the mixture in a single-screw extruder (manufactured by Placo Corporation, 40 mm diameter) at a resin temperature of 160°C. ADD 11.5g / 10min, density 921kg / m 3 , M.S. ADDExcept for using a 16 mN copolymer (B6) containing 0.12% by weight of MAH, migration, film appearance, and maximum processing speed were evaluated in the same manner as in Example 2, and then an extrusion laminate film was obtained. The resulting extrusion laminate film was evaluated for neck-in and seal strength. The results are shown in Table 1.

[0082] Example 7 (C) Layer is made of ethylene-vinyl alcohol copolymer (C) and MFR EVOH 5.5g / 10min, ethylene content 44mol%, density 1140kg / m 3 An extrusion laminate film was obtained in the same manner as in Example 2, except that an ethylene-vinyl alcohol copolymer (manufactured by Kuraray Co., Ltd., trade name: EVAL E105B) (C2) having a MFR of 13.0 g / 10 min at 210°C was used. The obtained extrusion laminate film was evaluated for film appearance, oxygen permeability, and seal strength. The results are shown in Table 1.

[0083] Example 8 (C) Layer is made of ethylene-vinyl alcohol copolymer (C) and MFR EVOH 1.9g / 10min, ethylene content 33mol%, density 1180kg / m 3 The migration, film appearance, and maximum processing speed were evaluated in the same manner as in Example 2, except that an ethylene-vinyl alcohol copolymer (manufactured by Mitsubishi Chemical Corporation, trade name: Soarnol G GC3304B) (C3) with a MFR of 4.0 g / 10 min at 210°C was used, and then an extrusion laminate film was obtained. The neck-in and seal strength of the obtained extrusion laminate film were evaluated. The results are shown in Table 1.

[0084] Example 9 (C) Layer is made of ethylene-vinyl alcohol copolymer (C) and MFR EVOH 1.7g / 10min, ethylene content 32mol%, density 1190kg / m 3Except for using an ethylene-vinyl alcohol copolymer (manufactured by Kuraray Co., Ltd., under the trade name of EVAL F171B) (C4) with a MFR of 4.1 g / 10 min at 210°C, migration, film appearance, and maximum processing speed were evaluated in the same manner as in Example 2, and then an extrusion laminate film was obtained. The neck-in and seal strength of the obtained extrusion laminate film were evaluated. The results are shown in Table 1.

[0085] [Table 1]

[0086] Comparative Example 1 The polyolefin (A) constituting the (A) layer and the (E) layer is MFR PO is 13.0g / 10min and density is 919kg / m 3 , M.S. PO Except for using a high-pressure low-density polyethylene (manufactured by Tosoh Corporation, trade name Petrothene 212) (A6) with a compressive strength of 13 mN, migration, film appearance, and maximum processing speed were evaluated in the same manner as in Example 1, and then an extrusion laminate film was obtained. The obtained extrusion laminate film was used to evaluate neck-in and seal strength. The results are shown in Table 2. Migration was significant, and productivity was poor.

[0087] Comparative Example 2 The polyolefin (A) constituting the (A) layer and the (E) layer is MFR PO is 2.0g / 10min, density is 922kg / m 3 , M.S. PO The migration, film appearance, and maximum processing speed were evaluated in the same manner as in Example 1, except that a high-pressure low-density polyethylene (Petrothene 180, product name, manufactured by Tosoh Corporation) (A7) with a strain rate of 54 mN was used. However, because laminate molding could not be performed at a processing speed of 50 m / min, necking could not be evaluated, and an extrusion laminate film could not be obtained. The results are shown in Table 2. The stretchability was poor, and productivity was poor.

[0088] Comparative Example 3 The polyolefin (A) constituting the (A) layer and the (E) layer is MFR PO is 4.0g / 10min, density is 905kg / m 3 , M.S. PO The migration and film appearance were evaluated in the same manner as in Example 1, except that a linear low-density polyethylene (manufactured by Tosoh Corporation, trade name Nipolon-Z HF310R) (A8) with a stretch strength of 5 mN was used. However, because resonance occurred and lamination molding was not possible, evaluation of the maximum processing speed and neck-in was not possible, and an extrusion laminate film could not be obtained. The results are shown in Table 2. The stretchability was poor, and productivity was poor.

[0089] Comparative Example 4 The polyolefin (A) constituting the (A) layer and the (E) layer is MFR PO is 8.0g / 10min and density is 919kg / m 3 , M.S. PO The migration, film appearance, and maximum processing speed were evaluated in the same manner as in Example 1, except that a high-pressure low-density polyethylene (Petrothene 203, product name, manufactured by Tosoh Corporation) (A9) with a strain rate of 36 mN was used. However, because lamination molding at a processing speed of 50 m / min was not possible, necking could not be evaluated, and an extrusion laminate film could not be obtained. The results are shown in Table 2. The stretchability was poor, and productivity was poor.

[0090] Comparative Example 5 The polyolefin (A) constituting the (A) layer and the (E) layer is MFR PO is 3.7g / 10min and density is 923kg / m 3 , M.S. POThe migration, film appearance, and maximum processing speed were evaluated in the same manner as in Example 1, except that a high-pressure low-density polyethylene (Petrothene 225, product name, manufactured by Tosoh Corporation) (A10) with a strain rate of 105 mN was used. However, because lamination molding at a processing speed of 50 m / min was not possible, necking could not be evaluated, and an extrusion laminate film could not be obtained. The results are shown in Table 2. The stretchability was poor, and productivity was poor.

[0091] Comparative Example 6 (C) Layer is made of ethylene-vinyl alcohol copolymer (C) and MFR EVOH 8.5g / 10min, ethylene content 35mol%, density 1180kg / m 3 The migration, film appearance, and maximum processing speed were evaluated in the same manner as in Example 1, except that an ethylene-vinyl alcohol copolymer (manufactured by Kuraray Co., Ltd., under the trade name EVAL C109B) (C5) with a MFR of 21.0 g / 10 min at 210°C was used, and then an extrusion laminate film was obtained. The obtained extrusion laminate film was evaluated for neck-in and seal strength. The results are shown in Table 2. The film appearance was poor.

[0092] [Table 2]

[0093] The ethylene content C2 (mol%) and density D of the ethylene-vinyl alcohol copolymer (c) described in the examples EVOH (kg / m 3 ) is shown in Figure 1. As shown in this figure, Example 8, which satisfies formula (1) described in the specification, is superior in interlayer adhesion and film appearance to Examples 7 and 9, which do not satisfy formula (1). Furthermore, Example 2, which satisfies formula (2), is even more superior in interlayer adhesion and film appearance.

[0094] Regarding the slope of formula (1) to formula (2), C2 is 27 mol%, D EVOH is 1210 kg / m 3Ethylene-vinyl alcohol copolymer (Kuraray Co., Ltd., product name EVAL L171B), C2 is 32 mol%, D EVOH is 1190kg / m 3 Ethylene-vinyl alcohol copolymer (C4), C2 is 35 mol%, D EVOH is 1180kg / m 3 Ethylene-vinyl alcohol copolymer (C5), C2 is 38 mol%, D EVOH is 1170kg / m 3 Ethylene-vinyl alcohol copolymer (manufactured by Kuraray Co., Ltd., trade name EVAL H171B), C2 is 44 mol%, D EVOH is 1140kg / m 3 Ethylene-vinyl alcohol copolymer (C2), C2 is 48 mol%, D EVOH is 1120kg / m 3 C2 and D of ethylene-vinyl alcohol copolymer (product name EVAL G156B, manufactured by Kuraray Co., Ltd.) EVOH was calculated from the correlation. [Industrial Applicability]

[0095] The extrusion laminate film of the present invention can be used for laminates that require film appearance, adhesiveness, and gas barrier properties, and is particularly suitable for use in laminates used as packaging materials for foods, beverages, pharmaceuticals, etc.

Claims

1. An extrusion laminate film comprising a laminate including at least a base material layer / (A) layer / (B) layer / (C) layer / (D) layer / (E) layer, which are adjacent to each other, wherein the (A) layer and the (E) layer are composed of a polyolefin (a) and a polyolefin (e) that satisfy (i) to (iii), respectively, the (B) layer and the (D) layer are composed of an adhesive resin (b) and an adhesive resin (d), respectively, and the (C) layer is composed of an ethylene-vinyl alcohol copolymer (c) that satisfies (iv) to (v). (i) Melt mass flow rate (MFR) measured according to JIS K6922-1 (1997) ＰＯ ) is 1.0 g / 10 min or more and 10.0 g / 10 min or less (ii) Melt tension (MS) measured at a temperature of 190°C and a take-up speed of 10 m / min ＰＯ ) is 3mN or more and 50mN or less (iii) MFR ＰＯ (g / 10 min) and MS ＰＯ (mN) product MFR ＰＯ ×MS ＰＯ is between 90 and 250 (iv) Ethylene content C ２ is 50 mol% or less (v) MFR at 190°C measured according to ISO 1133 ＥＶＯＨ is 1.0 g / 10 min or more and 8.0 g / 10 min or less

2. MFR of polyolefin (a) and / or polyolefin (e) ＰＯ 2. The extrusion laminate film according to claim 1, wherein the viscosity is 1.0 g / 10 min or more and 6.0 g / 10 min or less.

3. 3. The extrusion laminate film according to claim 1, wherein the polyolefin (a) and / or the polyolefin (e) comprises low-density polyethylene.

4. 4. The extrusion laminate film according to claim 1, wherein the adhesive resin (b) and / or the adhesive resin (d) satisfies (vi) to (viii). (vi) Melt mass flow rate (MFR) measured according to JIS K6922-1 (1997) ＡＤＤ ) is 1.0 g / 10 min or more and 10.0 g / 10 min or less (vii) Melt tension (MS) measured at a temperature of 190°C and a take-up speed of 10 m / min ＡＤＤ ) is 3mN or more and 50mN or less (viii) MFR ＡＤＤ (g / 10 min) and MS ＡＤＤ (mN) product MFR ＡＤＤ ×MS ＡＤＤ is between 70 and 250

5. MFR of ethylene-vinyl alcohol copolymer (c) ＥＶＯＨ (g / 10 min) of the polyolefin (a) and / or the polyolefin (e) ＰＯ (g / 10 min) and the MFR of adhesive resin (b) and / or adhesive resin (d) ＡＤＤ (g / 10 min) [(MFR ＰＯ ２ +MFR ＡＤＤ ２ ) / 2] ０．５ Ratio of RT ＭＦＲ 5. The extrusion laminate film according to claim 1, wherein the tensile strength is 0.20 or more and 5.0 or less.

6. 6. The extrusion laminate film according to claim 1, wherein the adhesive resin (b) and / or the adhesive resin (d) contains a maleic anhydride-modified polyolefin.

7. C of ethylene vinyl alcohol copolymer (c) ２ (mol%) and density D at 20 ° C. measured according to ISO 1183-3 ＥＶＯＨ (kg / m ３ 7. The extrusion laminate film according to claim 1, wherein the following formula (1) is satisfied: D ＥＶＯＨ <-4.265×C ２ +1325 (1)

8. The method for producing an extrusion laminate film according to any one of claims 1 to 7, characterized in that the (A) layer / (B) layer / (C) layer / (D) layer / (E) layer are simultaneously formed by coextrusion lamination molding.

Images