TW201228804A - Biaxially oriented ethylene-polymer multi-layer film - Google Patents

Abstract

The purpose of the present invention is to provide a biaxially oriented ethylene-polymer film that is highly transparent, easy to tear, resistant to breakage when a bag made therefrom is dropped, and exhibits high flex resistance. The present invention relates to a biaxially oriented ethylene-polymer multi-layer film characterized in that: a surface layer obtained from an ethylene polymer (A), the density of which is in the 910-938 kg/m3 range, is laminated to at least one surface of a base layer obtained from an ethylene-polymer composition (B) that contains at least 40% by mass of an ethylene/a-olefin random copolymer (b), the density of which is in the 895-920 kg/m3 range and is lower than that of the abovementioned ethylene polymer (A); and both the base layer and the surface layer are biaxially oriented.

Description

201228804 VI. Description of the Invention: [Technical Field to Be Invented by the Invention] The present invention relates to a biaxially stretched ethylene polymer multilayer thin medium which is superior in the strength of the bagging, and which is excellent in buckling resistance and easy to pull. [Prior Art] Ethylene·α-olefin random copolymer, so-called linear low-density polyethylene, (LLDPE), which is transparent, twin, olefinic, low-temperature heat compared to high-pressure low-density polyethylene A superior pressure resistance such as a sealability, a heat seal strength, and an impact resistance is widely used as a sealant for food packaging. One: The transparency of the ethylene/α-olefin random copolymer which is polymerized by the single-pointed angle, the low-temperature heat, the inclusion sealing property, and the hot viscosity are also superior. . . . , sealing as a method for improving the transparency of an ethylene·a-dilute random copolymer film, etc., it has been proposed to carry out three-dip stretching of acetamene·alkenene=copolymer under specific conditions. Branch (specialized company; will::, random copolymer and a mixture of ethylene or α. olefin random copolymer added with high ethylene or high and low density red thin film formed by the shrink film (patent Document 2). Glaze I stretched out

In addition, in order to have a temperature of 70 to 99 weight Q/y for the two extended LL cases, the low density polyethylene and the enamel have been extracted, and the linear low density of the catalyst is produced by the catalyst. Polyethylene: The range of 0.86~0.97g/cm3 made by the metallocene catalyst is the same as that of the first layer of the __ material and/or the material of the material 3 201228804 Layered multi-axial film for packaging (patent Document 3); having a density of less than 0.90 g/cm3 of ethylene (X-埽 smear plastomer copolymer 2〇~35 wt% and a twist of at least 0.912 g/cm3 and less than 〇 914 宫/(:1113 A biaxially stretched heat-shrinkable multilayer stretched film of a first outer layer and a second outer layer composed of a blend of VLDpE 65 to 8 % by weight (Patent Document 4). However, the biaxially stretched LLDPE obtained by the above method The film or the biaxially stretched multilayer LLDPE film has high transparency and tensile strength, and the tensile strength is also strong, so that it cannot be used as a film which is easy to be pulled. Further, as a superior buckling resistance A shaft-extending ethylene-based multilayer film has been proposed on at least one side of a biaxially stretched ethylene polymer film substrate layer having a density of 915 to 938 kg/m 3 so as to have a density of 89 〇 Kg/m 3 to 91 〇 Kg/m 3 . Biaxially extended E-wrap made of a hot-melt adhesive layer obtained from a vinyl-α-dilute smoke random copolymer In the case of the biaxially stretched ethylene-based polymer multilayer film described in Patent Document 5, although the buckling resistance (pinhole resistance) is excellent, the bagging strength is insufficient depending on the application. The invention has developed a baggage material having a superior strength in the baggage. Japanese Patent Laid-Open Publication No. SHO-58-90924, Japanese Patent Laid-Open Publication No. SHO-57-181828, No. 2002-534289 Japanese Patent Laid-Open Publication No. JP-A No. No. No. No. No. No. No. No. No. No. No. No. No. No. No. No. No. No. No. No. No. No. No. No. No. No. No. No. No. No. No. No. No. No. No. No. No. No. No. No. No. No. No. No. No. No. No. No. No. No. No. No. No. No. No. No. No. No. No. No. No. No. No. No. No. No. No. No. No. No. No. No. No. No. No. No. No. No. No. No. No. No. No..

S 100142656 4 201228804 (Problems to be Solved by the Invention) The present invention has been made in an effort to provide a biaxially stretched ethylene polymer film which is excellent in bagging strength and which is excellent in buckling resistance, cleavage resistance, and transparency. (Means for Solving the Problem) The present invention is a biaxially stretched ethylene polymer multilayer film characterized by having a mass of ethylene·α_anthracene random copolymer (b) 40 having a density of 895 to 920 kg/m 3 . At least one side of the base layer obtained from the ethylene-based polymer composition (%) or more, the laminate has a density of 910 to 938 Kg/m 3 and has a relatively random copolymerization of ethylene·α-olefin constituting the substrate layer. The surface layer obtained from the ethylene-based polymer (A) having a higher density of the substance (b) is formed by biaxially stretching the base layer and the surface layer together. (Effect of the Invention) The biaxially stretched ethylene polymer multilayer film of the present invention is excellent in bagging strength and excellent in buckling property, easy cracking property, chemical impact strength, transparency, and the like. [Embodiment] [Ethylene·α-olefin random copolymer (b)] An ethylene·α-olefin random copolymer belonging to a base material layer constituting the biaxially stretched ethylene polymer multilayer film of the present invention (b) The density is in the range of 895 to 920 Kg/m3, preferably 895 to 915 Kg/m3, more preferably 900 to 91 Å Kg/m3. The ethylene·α-olefin random copolymer (b) of the present invention is ethylene and an α-dilute hydrocarbon having a carbon number of 4 or more, for example, 1-butadiene, 1-heptene, 1-hexene, iota-dish, 4 _曱100142656 5 201228804 A random copolymer of an α-olefin such as a 1-pentene group, preferably an α-olefin having a carbon number of 6 or more. When the ethylene/olefin copolymer (1) of the present invention has a density in the above range, it may be one type or a mixture of two or more types. When the ethylene/heart olefin random copolymer having a density outside the above range is used, there is no improvement in the bag strength of the obtained biaxially stretched ethylene polymer multilayer film. The ethylene/olefin random copolymer (b) of the present invention has a melt flow rate (MFR: ASTM D1238, a load of 2160 g, and a temperature of 19 〇. 〇 is not particularly limited, and has a film formation month & force scraping. It is usually in the range of 0.1 to 10 g/l 〇 minute, preferably 0.5 to 5 g/l 〇 minutes. [Ethylene-based polymer composition (B)] A substrate which forms the biaxially stretched ethylene polymer multilayer film of the present invention. The ethylene-based polymer composition (B) of the layer contains the ethylene/α-olefin random copolymer (b) of 4 g% by mass or more, that is, the ethylene/olefin random copolymer (b) Separately, it is preferred to contain ethylene. Aromatic olefin random copolymer (b) 4 〇 to 85 i, although 〇 / 〇, more preferably 50 to 8 〇 mass%, optimally 65 to 75 mass 〇 / 〇 range of ethylene The other ethylene-based polymer contained in the ethylene-based polymer composition of the present invention may also include, for example, an ethylene·α-olefin copolymer having a density of from 915 to 970 kg/m 3 , preferably from 926 to 965 kg/m 3 . High-pressure low-density polyethylene with a density of 910~935Kg/m3, preferably 915~930Kg/m3 Two or more ethylene·α, smoky copolymer or B-baked 100142656 201228804 homopolymer, or two or more different ethylene·α-olefin copolymers or ethylene homopolymers and high-pressure method low-density polyethylene The above ethylene·α-olefin copolymer is ethylene and an olefin having a carbon number of 3 or more. For example, 1-butene, μ-heptene, 丨-hexene, 丨-octene, 4-methyl·丨-pentene Or a random copolymer of α-dilute hydrocarbon. The ethylene-based polymer composition (Β) of the present invention preferably has a density in the range of 900 to 925 Kg/m 3 , more preferably in the range of 904 to 922 kg/m 3 . In addition to the above range, the resulting bagging strength and buckling resistance of the biaxially stretched ethylene polymer multilayer film are not improved. The ethylene-based polymer composition (B) of the present invention has a film forming ability. The melting flow rate (MFR: ASTM D1238 'load 2160g' temperature 190 ° C) is not particularly limited, and is usually in the range of 〜5 to 1 〇g/1 〇 minute, preferably 0.8 to 5 g/l 〇 minute. In the ethylene·α-olefin random copolymer (b) or the ethylene-based polymer composition (B) of the present invention, Within the scope of the object of the present invention, additives or other polymers which are commonly used, such as antioxidants, weather stabilizers, antistatic agents, antifogging agents, anti-blocking agents, slip agents, nucleating agents, pigments, etc., may be added as needed. [Ethylene-based polymer (A)] The ethylene-based polymer (8) which forms at least one surface layer of the biaxially-oriented ethylene polymer of the present invention, preferably two surfaces, has a density of 915 to 938.

KgW, preferably in the range of 92 Å to 935 Kg/m3, has a density higher than that of the ethylene/hydrocarbon random copolymer (b) constituting the substrate layer. 100142656 201228804 In the case where an ethylene-based polymer having a density outside the above range is used, the bagging strength of the biaxially stretched ethylene polymer multilayer film is not improved. The ethylene-based polymer (A) of the present invention is provided before the film forming ability, and the melt flow rate (MFR: ASTMD1238, load: 2,160 g, temperature: 190 ° C) is not particularly limited, and is usually 〇5 to 1 〇g. /1 〇 minutes, preferably in the range of 0.8 to 5 g/10 minutes. The density of the U-composite (A) of the present invention is measured by a density gradient tube as will be described later. The ethylene-based polymer (A) of the present invention is particularly preferably an ethylene copolymer composition (A4) or an ethylene copolymer composition (A-2) obtained by mixing ethylene-based polymers having different densities. [Ethylene copolymer composition (A-1) The ethylene copolymer composition (Α_ι) of the present invention is an ethylene·α-olefin copolymer having a density of from 895 to 925 Kg/m, preferably from 900 to 920 Kg/m3. (al) an ethylene copolymer composition composed of a component of the ethylene-based polymer (a2) having a composition and a density of 926 to 970 Kg/m3, preferably 930 to 965 Kg/m3, preferably ethylene/α-olefin random The copolymer (ai) component is 5 to 95 parts by weight, more preferably 2 to 15 parts by weight, and the ethylene-based polymer (a2) component is 95 to 5 parts by weight, more preferably 80 to 20 parts by weight [(al)+(a2) The range of = 100 parts by weight. The ethylene copolymer composition (A) of the present invention is obtained before the film forming ability, and the melt flow rate thereof (MFR: ASTM D1238, load 100142656 8 201228804 2160 g, temperature 190) °C) is not particularly limited and is usually in the range of from 0.5 to 10 g/10 min, preferably from 0.8 to 5 g/10 min. [Ethylene copolymer composition (A-2)] The ethylene copolymer composition of the present invention (A-2) is an ethylene·α-olefin random copolymer (al) having a density of 895 to 925 Kg/m 3 , preferably 900 to 920 Kg/m 3 , and a density of 926 to 970 Kg/m 3 , preferably 930~965 An ethylene copolymer composition composed of a high molecular weight low density polyethylene (a3) having a Kg/m3 range of a vinyl polymer (a2) component and a density of 910 to 935 Kg/m3, preferably 915 to 930 Kg/m3. The ethylene copolymer composition (A-2) is preferably (al), (aq and (a3), and the ethylene/α-olefin random copolymer (al) component is preferably 5 to 95 parts by weight, more preferably It is preferably in the range of 20 to 80 parts by weight and the ethylene-based polymer (a2) component is 95 to 5 parts by weight, more preferably 40 to 70 parts by weight [(al) + (a2) = 100 parts by weight]. The composition (A-2) is preferably an ethylene·α-dilute hydrocarbon random copolymer (al) component + an ethylene polymer (a2) component of 50 to 95 parts by weight, preferably 60 to 90 parts by weight, and a high pressure method. The low-density polyethylene (a3) is in the range of 50 to 5 parts by weight, preferably 30 to 10 parts by weight of [[(al)+(a2)]+(a3)=100 parts by weight]. The ethylene copolymer composition of the present invention The material (A-2) is removed before the film forming ability, and the melt flow rate (MFR: ASTM D1238, load 2160 g, temperature 190 ° C) is not particularly limited, and is usually 〇.5~l〇g/10 Minutes, preferably in the range of 0.8 to 5 g/l 〇 minutes. [Ethylene·α-olefin The copolymer (ai) is a composition of the ethylene copolymer composition (Α·1) or an ethylene copolymer composition of at least one surface layer (100. a component of the B-dilute hydrocarbon copolymer (4), having a density of 895 to 925 Kg/m3, preferably _~9 胤3 of ethylene and a carbon number of 4 or more of α-ene, such as 丨·butene, A random copolymer of an α-olefin such as 1-heptene, 1-hexene, i.octene or 4-methyl-1-pentene, preferably an α-olefin having 6 or more carbon atoms. In the case where the invented B#·α_dilute hydrocarbon copolymer (10) has a density in the above range, one or a mixture of two or more kinds may be used. The melt flow rate (MFR: ASTMD1238, load 2160g, temperature 190°〇) of the ethylene·α-olefin copolymer (ai) of the present invention is a composition of the ethylene-based polymer (a2) to be described later (A- 1) Or when it is a composition (A-2) which is lower than the ethylene-based polymer (a2) and the polyethylene (a3), the film formation ability is not particularly limited, and usually It is in the range of 0.01 to 10 g/10 min, preferably 0.2 to 5 g/10 min. Further, the molecular weight distribution of the ethylene·α-olefin copolymer (al) (the ratio of the weight average molecular weight Mw to the number average molecular weight Μη: The Mw/Mn is usually in the range of 1.5 to 4.0, preferably 1.8 to 3.5. The Mw/Mn can be measured by gel permeation chromatography (GPC). The copolymer (a 1 ) can be prepared by a conventionally known production method using a Ziegler catalyst, a single catalyst, or the like, preferably by a single-catalyst (metallocene catalyst) copolymerization. The catalyst containing the metallocene & is preferably a (a) transition metal metallocene compound, (dead) organic alumina compound And (c) a carrier formed, and if necessary, may be formed by a component such as 100142656 201228804 and (d) an organoaluminum compound and/or an organoboron compound. Further, a catalyst for olefin polymerization containing such a metallocene compound And a method of preparing an ethylene-and-alkene copolymer (al) using a catalyst is described in, for example, Japanese Patent Laid-Open No. Hei 8-269270. [Ethylene polymer (a2)] _ > (1) Ethylene of the ethylene copolymer composition (A) or the other component of the ethylene copolymer composition (A-2) which constitutes at least one surface layer of the biaxially stretched 6 olefin polymer layer film of the present invention (4) a polymer (a2) having a homopolymer of ethylene having a density of 926 to 970 Kg/m, preferably 930 to 5 kg/m3, or an α-olefin having a slave number of 3 or more, such as propylene or ruthenium-butene. a random copolymer of α-olefin such as heptene, 1-hexene, 1-octene, 4-methyl·ι-pentene, etc. The ethylene-based polymer (a2) of the present invention is in the above range The density may be one or a mixture of two or more. The flow rate of the melt of the fine mesh (a2) (mpr: ASTM D1238, load 21) 60 g, a temperature of 19 〇. The composition of the ethylene-based polymer (al) and the ethylene-based polymer (al) and the high-pressure low-density polyethylene (a3) described later. The composition (A_2) is not particularly limited as long as it has a film forming ability, and is usually in the range of 〇·〇1 to l〇〇g/l 〇 minute, preferably 0.1 to 80 g/10 minutes. In the ethylene-based polymer (a2), a vinyl polymer (a2-l) component having a density of 926 to 945 kg/m3, preferably 935 to 945 kg/m3, and a density of 946 to 970 kg/m3, preferably 950, are further used in combination. ~965Kg/m3 Fan 100142656 11 201228804 The ethylene-based polymer (a2-2) component, low-density component and high-density component can provide biaxially stretched ethylene polymerization which can be more easily cracked in both the longitudinal and transverse directions. Multi-layer film. When the ethylene-based polymer (a2-l) component and the ethylene-based polymer (a2-2) component are used as the ethylene-based polymer (a2), it is preferable to set the ethylene-based polymer (a2-l) component to 1~ 99 parts by weight, preferably 30 to 70 parts by weight, and the ethylene-based polymer (a2-2) component is 99 to 1 part by weight, preferably 70 to 30 parts by weight [(a2-l)+(a2-2)=100 The ratio of parts by weight]. Further, the molecular weight distribution (the ratio of the weight average molecular weight Mw to the number average molecular weight 4 Mn: Mw/Mn) of the ethylene-based polymer (a2) is usually in the range of 1.5 to 4.0, preferably 1.8 to 3.5. This Mw/Mn can be measured by gel permeation chromatography (GPC). The above-mentioned B (four) polymer ship (a2)' can be modulated by a conventionally known manufacturing method using a Ziegler catalyst, a single-catalyst or the like. In particular, a vinyl polymer (a2_1) is used as the ethylene-based compound (a2), which is preferably a polymer obtained by a single-catalyst (metallocene catalyst). The catalyst containing the metallocene compound is preferably formed by (4) a dipentametal compound of a transition metal, (b) an organic oxide compound, and (4) a carrier, and may further comprise such an ingredient and (4) an organoaluminum compound and / or formed by organic compounds. In addition, a catalyst for a catalyst for the polymerization of a dilute metal compound containing such a metallocene compound, and a catalyst for the use of a catalyst for the ethylene/α-olefin copolymer (4) are described in, for example, Japanese Patent Laid-Open No. Hei 8-269270. in. 100142656

S 12 201228804 On the other hand, when the ethylene-based polymer (a2_2) is used as the ethylene-based polymer (a2), it may be a polymer obtained by a single-catalyst (metallocene catalyst) or may be borrowed. The so-called high-density polyethylene baking produced by the Ziegler catalyst, etc., known to the public. [High-pressure method low-density polyethylene (a3)] is a high-pressure method of forming another component of the ethylene copolymer composition (A-2) of at least one surface layer of the multilayer film forming the biaxially stretched ethylene polymer of the present invention. The low density polyethylene (a3) has a density of 910 to 935 Kg/m3, preferably 915 to 930 Kg/m3. The high-pressure method low-density polyethylene is a homopolymer of ethylene polymerized under high pressure, or a copolymer of a vinyl compound such as 5% by weight or less of other α-. olefin or vinyl acetate, and is low in entry. A vinyl polymer in the category of density polyethylene. When the high-pressure method low-density polyethylene having a density of less than 910 Kg/m3 is formed into a biaxially stretched multilayer film as the ethylene copolymer composition (A-2), the obtained film is likely to be stuck and has high tensile strength. However, there is a possibility that the object of the present invention cannot be achieved. The melt flow rate (MFR: ASTM D1238, load 2160g, temperature 190 °C) of the high-pressure process low-density polyethylene (a3) is made into the above-mentioned ethylene-based polymer (al) and ethylene-based polymer 〇1) The composition (A-2) is not particularly limited as long as it has a film forming ability, and is usually in the range of usually 0.1 to 30 g/10 min, preferably 1 to 10 g/l. The ethylene copolymer composition (A·1) and the ethylene copolymer composition (A-2) of the present invention can be obtained by separately obtaining an ethylene·α-olefin random copolymer (ai) and B 100142656 13 201228804 olefin system. After the polymer (a2) and the high-pressure process low-density polyethylene (a3), dry blending is performed by a Hanschel combiner, a drum mixer, a V-blender, or the like, or after the dry blending A single-axis extruder, a multi-axis extruder, a Banbury mixer, etc. are obtained by melt-kneading. The ethylene copolymer composition (A-1) of the present invention may be subjected to various known polymerization methods by separately polymerizing ethylene·α-olefin random copolymers by using a plurality of polymerizers in a continuous multistage polymerization process. (al) a method of preparing an ethylene copolymer composition (A-1) after mixing with the ethylene-based polymer (a2); using an aggregator, first polymerizing an ethylene/α-olefin random copolymer (al) Or a method of polymerizing the ethylene-based polymer (a2), followed by polymerizing the ethylene-based polymer (a2) or the ethylene-α-olefin random copolymer (al). The ethylene-based polymer (A), the ethylene copolymer composition (A-1), the ethylene copolymer composition (A-2), or the ethylene·α-olefin copolymer (al) constituting the composition of the present invention, In the ethylene-based polymer (a2) or the high-pressure-process low-density polyethylene (a3), an antioxidant, a weathering stabilizer, an antistatic agent, and an antifogging which are generally used may be blended as needed within a range not impairing the object of the present invention. Additives or other polymers of agents, anti-blocking agents, slip agents, nucleating agents, pigments, and the like. [Biaxially stretched ethylene polymer multilayer film] The biaxially stretched ethylene polymer multilayer film of the present invention is characterized by comprising an ethylene·α-dilute hydrocarbon random copolymer having the above-mentioned degree in the range of 895 to 915 kg/m 3 (b) at least one side of the base material layer obtained by disposing the ethylene-based polymer composition (B) of 40% by mass or more, and the laminate has a density of 910 to 93 8 Kg/m 3 and has

100142656 14 S 201228804 The surface layer obtained from the ethylene polymer (A) having a higher density than the ethylene/α-olefin random copolymer (b) constituting the base material layer, and the base layer and the surface layer are simultaneously subjected to Obtained by one axis extension. In the biaxially stretched vinyl-based multilayer film of the present invention, a surface layer obtained by laminating the ethylene-based polymer (A) having a density of from 910 to 938 kg/m3 may be laminated on both surfaces of the base material layer. When a surface layer composed of a vinyl polymer (4) having a density in the range of 910 to 938 kg/m3 is laminated on both surfaces, the density may be in the above range, and the density may be the same density or a different density. The thickness of the biaxially stretched ethylene polymer multilayer film of the present invention may be determined depending on the application. Generally, the thickness of the biaxially stretched ethylene polymer film substrate layer is about 10 to 20 (^m, preferably about 15 to 130 μm). The thickness is in the range of about 0.2 to 60 μm, preferably about 0.4 to 40 μm, and the total thickness of the biaxially stretched ethylene polymer multilayer film is in the range of about 10 to 32 μm, preferably about μ to 23 μm. The biaxially stretched ethylene polymer film substrate layer of the biaxially stretched ethylene polymer multilayer film may be one layer or more, or may be a plurality of layers of the intermediate layer and the laminate layer. The biaxially stretched ethylene polymerization of the present invention The multilayer film can be used to improve the printability or adhesion to other substrates including other thermoplastic resin films described later, and can be applied to the other side of the biaxially stretched ethylene polymer multilayer film (if the substrate layer is The second layer or more is the surface of the laminated layer. If the two sides are hot-melt adhesive layers 100142656 15 201228804, it is a surface thereof, and surface activity such as corona treatment, flame treatment, electropolymerization treatment, primer treatment, etc. is performed. The biaxially-stretched ethylene polymer multilayer film of the present invention may be laminated with a thermoplastic resin film on at least one side depending on various applications. As such a thermoplastic resin film, for example, polyolefin (polyethylene) may be exemplified. , polypropylene, poly 4-mercapto-1-pentene, polybutene, etc.), polyester (polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate) Ester, etc., polyamine (nylon-6, nylon-66, polydecylamine, etc.), polyvinyl chloride, polyimine, ethylene/vinyl acetate copolymer or its alkali compound, polyvinyl alcohol, a film obtained by using polyacrylonitrile, polycarbonate, polystyrene, an ionic polymer, or a mixture thereof, etc. Further, the thermoplastic resin film may be an unstretched film, an extended film, or a borrowed film. a laminate obtained by one or two or more types of co-extrusion molding, extrusion lamination, dry lamination, thermal lamination, etc. Among them, a biaxially stretched thermoplastic film, particularly polypropylene, is preferably used. Biaxial extension heat composed of polyethylene terephthalate and polyamidamine In the biaxially stretched ethylene polymer multilayer film of the present invention, it may be laminated with a substrate composed of paper, aluminum foil, or the like. [Method for Producing Biaxially Stretched Ethylene Polymer Multilayer Film] The axially extending ethylene polymer multilayer film is formed by, for example, 40% by mass or more of the ethylene/α-olefin random copolymer (b) having a density of 895 to 915 Kg/m 3 in the substrate layer formed by various known methods. Ethylene 100142656 16 201228804 The composition of the composite (B), and the above-mentioned density of the surface layer formed in the range of 9lQ to 938 kappa 3, and having a looseness of the ethylene/α diluted hydrocarbon random copolymer (b) constituting the substrate layer Further density of the material, polymerization, and the formation of the warp, by the tubular method or the flat method (triangulation method), according to the above range in the longitudinal direction _ (t) direction - axial extension. The two-axis extension may be a simultaneous two-axis extension or a successive two-axis extension. Among these methods, the axially extending ethylene polymer obtained by the flat method is more preferable because it has superior transparency. In the case of the flat type, the multilayer sheet which is usually formed by molding is usually stretched in the longitudinal direction at a temperature range of 90 to 125 C, usually 2 〇 to 7 〇, preferably 2.3 to 5.5 times. 9〇~13〇<t temperature range, obtained in the horizontal direction by 5.G~12.G times, preferably 6()~1() 5 times extension. The two-axis extension rear view application can also be heat-fixed in the temperature range of 8 〇 14 (rc). The solid/dish degree can be changed according to the heat shrinkage rate of the target. On the single side of the polymer multilayer film, when laminating the thermoplastic resin phase, various known methods can be employed, for example, on the substrate layer or the surface layer of the biaxially stretched ethylene polymer multilayer film as needed or twice corona treated. a method of dry laminating with a thermoplastic resin film after coating a urethane type adhesive or an isocyanate adhesive; or a laminated surface or a "^", :, a hetero layer and a thermoplastic resin film, A method of extrusion lamination using a high pressure method low density polyethylene. [Examples] - The present invention is described by way of example "But the invention is not a mosquito, etc. 100142656 17 201228804 Examples. Various tests of the present invention The method and the evaluation method are as follows: (1) Melt flow rate (g/l〇min) Measured according to ASTM D1238's weight 2i60g, temperature 190. (2) Density (Kg/m3) Ethylene polymer strands obtained from MFR (12: After treatment for 2 hours), after 1 hour of slow cooling to room temperature (23. 〇), it is measured by D method (density gradient tube) according to JIS K7112. (3) Fog value (%) Haze Meter (NDH-2000, manufactured by Nippon Denshoku Industries Co., Ltd.), and measured the haze of the biaxially stretched ethylene polymer multilayer film i sheet according to JIS K7136. (4) The tensile test consisted of a biaxially stretched ethylene polymer multilayer film according to the length direction. In the flow direction (MD) and the width direction (TD) of the film, a test piece of a short sheet shape of 15 mm width and 200 mm length was cut out, and a Young's ratio (MPa) was measured in accordance with JIS K7127 using a TENSILON RT1225 model manufactured by ORIENTEC Co., Ltd. (5) Pulling strength (g/each piece) Using a light-weight tensile tester (manufactured by Toyo Seiki Seisakusho Co., Ltd.), a biaxially stretched ethylene polymer multilayer film was cut out to have a length of 63.5 mm (long side) and A rectangular test piece having a width of 50 mm (short side) at a right angle to the direction of the cracking direction was cut into a 12.7 mm slit from the side at the center of the short side, and subjected to a tensile test 100142656 18 201228804 to obtain a tensile strength (g/). Every 1 piece) (6) Impact strength (kg · cm) Use East A film impact tester manufactured by Seiki Co., Ltd., using a 0.5-diameter hemisphere having a front end shape, and a square test piece of 1.00 mm square was cut out from a biaxially stretched ethylene polymer multilayer film, and the impact strength was measured at an ambient temperature of 23 ° C. (7) Heat shrinkage ratio (%) A square test piece of 100 mm width was cut out from a biaxially stretched ethylene polymer multilayer film, and allowed to stand in an oven at 100 ° C for 15 minutes. Thereafter, the test piece was taken out from the oven and allowed to stand at an ambient temperature of 23 ° C for 30 minutes or more, and then the length of each side of the square test piece was measured as the amount of change. The heat shrinkage ratio is calculated by the following formula. Heat shrinkage value = (100 - A) / 100xl00 A: Length of the square side after standing in the oven (8) Heat seal strength Using a Toyo Seiki heat seal tester, cut by a biaxially stretched ethylene polymer multilayer film A test piece of 1 mm wide and 150 mm long was folded, and then heat-sealed by a heater at 80 ° C to 140 ° C, a pressure of 0.2 MPa, and a sealing time of 1 second, and then cut by a sealed test piece. The peeling strength was measured using a 15 mm test piece using TENSILONRT 1225 type manufactured by ORIENTEC. (9) Financial Flexibility (units/m2) Using a Gelvo Flex Tester manufactured by Tester Industries, a 210 mm wide and 297 mm long test piece was cut from a two-axis extended ethylene 100142656 19 201228804 polymer multilayer film, and the flexion angle was 440 degrees. The buckling speed was 40 times/min, and after 3000 buckling tests were carried out in various environments of 0° C. and -30° C., the test piece was prepared from the buckling test, and the AGERES seal check needle was used by Mitsubishi Gas Chemical Co., Ltd. Number of holes (pieces / m2). (10) Burr strength Using a TENSILON RT1225 model manufactured by ORIENTEC, a test piece of 60 mm width and 200 to 300 mm was cut out from a biaxially stretched ethylene polymer multilayer film, and the spur strength was measured in accordance with JIS Z1707. (11) Bag dropping test condition A: As a laminate for the bag dropping test, a biaxially stretched polyethylene terephthalate film (thickness: 12 μm) and a biaxially stretched polyamide film (thickness: 15 μm) were prepared. And a biaxially stretched ethylene polymer multilayer film, the biaxially stretched polyethylene terephthalate S film and the biaxially stretched ethylene polymer multilayer film are laminated using a laminator, and then the two axes are laminated using a laminator The stretched ethylene polymer multilayer film was bonded to the side of the biaxially stretched polyimide film to obtain a laminate. The layered system is a biaxially stretched poly(ethylene dicarboxylate) film/biaxially stretched polyimide film/two-axis extended B-polymer multilayer film. Further, the anchoring agent is used in TAKELAC A31 ΤΑΚΕΝΑΤΕ, ΤΑΚΕΝΑΤΕ Α 3 (manufactured by Mitsui Chemicals Co., Ltd.), and a mixture of acetic acid vinegar (manufactured by Hiroshima Kazuyoshi Co., Ltd.) as a solvent. The obtained biaxially stretched ethylene polymer multilayer film of the laminated body is used in the inside of the packaging bag, and 100142656 20 201228804 standing pouch (standing P〇uch) having a south direction of 225 mm, a lateral direction of 140 mm, and a bottom height of 41 mm is formed by using a bag making machine. ). χ, the seal width is 5mm. Fill the pouch with 500ml of water, and then enter the a a 义 ― ― ― ― ― 罝 硬 硬 硬 硬 硬 硬 硬 硬 硬 硬 硬 硬 硬 硬 硬A standard bag of this kind is at 5. . After standing for 24 hours in the environment, the bag "from 15 〇 Cm, from the bottom, began to fall from the face, as the two groups, = 'group is repeated for the upper limit, calculate the prepared 2 () bag, 'The number of bags that did not break the bag after Yuchuan Group Luo was used, and (4) was used as the bag breaking rate. Conditions Β In the conditional wipes, except for using a bag making machine to form an upright bag having a height direction of 150 mm, a wheel direction of 95 mm, and a bottom height of 29 mm, the bean was carried out in the same manner as in Condition A, and the bag breaking rate was obtained. 〃 Condition C. After obtaining a laminate in the same manner as in Condition a, the obtained multilayered ethylene polymer multilayer film of the laminate was used in a packaging bag, and a three-dimensional seal of 175 mm in the longitudinal direction and 125 mm in the transverse direction was formed using a bag making machine. bag. Also, the sealing width is l〇mm. Fill the water in the three-way bag made of 2〇_, into: after degassing, seal the mouth. Prepare 2 such bags, at 5. [After leaving 24 hours in the environment, '1 bag, from 100cm high, falling in the horizontal direction, adding 500g of the same size as the bag size and starting from the face as a group - 2G group The upper limit is repeatedly dropped, and the number of times the bag is broken is calculated. The number of times of the 20 bags that were prepared was broken up, and the average value was taken as the average number of times of bag breaking. The polymers and compositions used in the examples and comparative examples of the present invention are as follows. (1) Ethylene·α-olefin random copolymer (al) 100142656 21 201228804 (1) Ethylene·1-hexene random copolymer (al-l): a polymer using a metallocene catalyst, density: 905 Kg/ M3, MFR ·· 0.5g/10 minutes. (2) Ethylene·1-hexene random copolymer (al-2): a polymer using a metallocene catalyst, density: 918 Kg/m3, MFR: 3.8 g/10 min. (H) Ethylene polymer (a2-l) (1) Ethylene·1-hexene random copolymer (a2-M): a polymer using a metallocene catalyst, density: 930 kg/m3, MFR: 60 g /10 minutes. (iii) Ethylene polymer (a2-2) (1) Ethylene/propylene/1-butene random copolymer (a2-2-l): Polymer using Ziegler catalyst, density: 958 Kg/ M3, MFR: 0.9 g/10 min. (iv) High-pressure process low-density polyethylene (a3) (1) High-pressure process low-density polyethylene (a3-l): density: 917 Kg/m3, MFR: 7 g/10 min. (v) Ethylene polymer composition (A-2) (1) Ethylene polymer composition (A-2-1) The above ethylene·1-hexene random copolymer (a1), ethylene·1- Hexene random copolymer (a2-; M), ethylene/propylene/1-butene random copolymer 02-2-1) and high-pressure low-density polyethylene (a3-l) according to 36:24:25: After the dry doping ratio of 15 parts by weight, the mixture was melt-kneaded at a temperature of 190 ° C and an extrusion amount of 50 kg/hr using a two-axis extruder (46 ηηπιφ) manufactured by Ikei Iron Works Co., Ltd. to obtain an ethylene polymer. Composition (A-2-1) ° The obtained ethylene polymer composition (A-2-1) density: 927 Kg/m3, 100142656 22 201228804 MJFR: 2.0 g/10 min. 〇i) ethylene·α-olefin random copolymer (1) ethylene·1-hexene random copolymer (bi) (same as (3) above): polymer density using a metallocene catalyst : 9〇5 Kg/m3, MFR: 0.5g/10 minutes. (2) Ethylene·p-hexene random copolymer (b_2” polymer using a metallocene catalyst' density: 903 Kg/m3, MFR: 3.8 g/10 min. (3) Ethylene·1-hexene Synthetic copolymer (b_3): a polymer using a metallocene catalyst, density: 913 Kg/m3, MFR: 3.8 g/l 〇min. (4) Ethylene·1-hexene random copolymer (b_4): Polymer using a metallocene catalyst 'density: 918 Kg/m3, MFR: 3.8 g/l 〇 minute. (vii) ethylene-based polymer composition (b) (1) ethylene-based polymer composition (B- 1) The ethylene polymer composition (A_2_1} : 5 〇 mass % and the ethylene·1-hexene random copolymer (b_2): 50 f% by weight dry-mixing to obtain a vinyl polymer composition (IV) The amount of the ethylene-α-olefin random copolymer (b) contained in the polymer composition (b) was 68% by mass [(al-l) + (b-2)] ' Density: 915 Kg/m3 MFR : 2 9g / 1〇 minutes. (2) Ethylene polymer composition (B_2) The above ethylene polymer composition (Α_2·1): 8〇胄% by weight and the above ethylene·1-hexene random Copolymer (4): 20% by mass for dry doping to obtain ethylene-based polymer The product (Μ). The ethylene-based polymer composition (Β_2) contains 100142656 23 201228804 The amount of ethylene/α-dilute hydrocarbon random copolymer (b) is 45.6 mass ° / 〇 [(al-l) + (b-2)], density: 922 Kg/m3, MFR: 2.3 g/10 min. (3) Ethylene polymer composition (B-3) The above ethylene polymer composition (A-2-1): 60% by mass and the above ethylene·1-hexene random copolymer (b-2): 40% by mass is dry-doped to obtain a vinyl-based polymer composition (B-3). A vinyl-based polymer composition (B) -3) The amount of the ethylene·α-olefin random copolymer (b) contained was 61.6% by mass [(al-1)+(b-2)], density: 917 Kg/m3, MFR: 2.7 g/10 (4) Ethylene polymer composition (B-4) The above ethylene polymer composition (A-2-1): 40% by mass and the above ethylene·1-hexene random copolymer (b-2) : 60% by mass is dry-doped to obtain a vinyl-based polymer composition (B-4). The ethylene-α-olefin random copolymer (b) contained in the ethylene-based polymer composition (B-4) The amount is 74.4% by mass [(al-l)+(b-2)], the density is 913 Kg/m3, and the MFR is 2.3 g/10 minutes. (5) Ethylene-based polymer composition (B-5) The ethylene polymer composition (A-2-1): 50% by mass and the above ethylene·1-hexene random copolymer (b-3): 50% by mass, dry doping to obtain a vinyl polymer composition (B_5). The amount of the ethylene·α-dilute hydrocarbon random copolymer (b) contained in the ethylene-based polymer composition (B-5) was 68% by mass [(al-l)+(b-3)], and the density was: 920Kg/m3, MFR: 2.9g/10 minutes. (6) Ethylene polymer composition (B-6) The above ethylene polymer composition (A-2-1): 50% by mass and ethylene·1_

100142656 24 S 201228804 Diluted random copolymer (b, 4): 5 G mass% was dry-doped to obtain a vinyl polymer composition (B-6). The amount of the ethylene·α·olefin-free random copolymer (b) contained in the ethylene-based polymer composition (B_6) is 68 mass (10)...^+(4))], and the density is 915 Kg/m 3 'MFR: 2.9 g/1. (^^4. [Example 1] The ethylene polymer composition (B)) was used as the ethylene-based polymer composition (8) for the ethylene-diethyl ether polymer film substrate layer, and the above ethylene polymerization was carried out. The body composition (A-2-1) is used as a vinyl polymer (A) for surface layer, and is melt-extruded by a biaxially stretched film forming machine equipped with three extruders, and shaped by a T sub-mold. Quenching by cooling|quenching to obtain a two-layer sheet having a thickness of about 2 mm (layer ratio of A-2-l/Bl/A-2-l=5/90/5). The sheet was heated to 112 °C. And extending 5 times in the flow direction (longitudinal direction) of the film, heating the sheet 5 times longer to 12 〇t: and extending 10 times in the direction orthogonal to the flow direction (horizontal direction) to obtain a thickness of 40 μm The biaxially stretched ethylene polymer multilayer film was measured for physical properties and the like of the biaxially stretched ethylene polymer multilayer film by the method described above. The results are shown in Table 1. [Example 2] In addition to the use in Substituting Example 1. The ethylene polymer composition (B-J) was subjected to the same procedure as in Example i except that the ethylene polymer composition (B-J) was used, and the biaxially-stretched ethylene polymer multilayer thin layer was obtained. The measurement was carried out by the method described above. Physical properties of the biaxially stretched ethylene polymer multilayer film, etc. No. 100142656 25 201228804 The results are shown in Table 1. [Example 3] In addition to the ethylene polymer composition (B-1) used in the replacement of Example 1, the above ethylene was used. Other than the polymer composition (B-3), a biaxially stretched ethylene polymer multilayer film was obtained in the same manner as in Example 1. The physical properties of the obtained biaxially stretched ethylene polymer multilayer film were measured by the method described above. Table 1 is the same as Example 1 except that the ethylene polymer composition (B-1) used in Example 1 was used instead of the above ethylene polymer composition (B-4). The biaxially stretched ethylene polymer multilayer film was obtained, and the physical properties of the obtained biaxially stretched ethylene polymer multilayer film were measured by the method described above. The results are shown in Table 1. [Example 5] The ethylene-based polymer (A) for the surface layer used in Example 1 was used, except that the ethylene-based polymer composition (A-2-1) and the ethylene·1-hexene random copolymer (al-2) were used. The biaxially stretched ethylene polymer multilayer film was obtained in the same manner as in Example 1. The physical properties and the like of the obtained biaxially stretched ethylene polymer multilayer film were measured by the methods described above. The results are shown in Table 1. [Example 6] The ethylene polymer composition (B-1) used in Example 1 was subjected to the same procedure as in Example 1 and 100142656 26 201228804 except that the ethylene polymer composition (B-5) was used to obtain a biaxially stretched ethylene polymerization. Multi-layer film. The physical properties and the like of the obtained biaxially stretched ethylene polymer multilayer film were measured by the methods described above. The results are shown in Table 1. [Example 7] A second axis was obtained in the same manner as in Example 1 except that the ethylene polymer composition (B-1) used in Example 1 was used instead of the above ethylene polymer composition (B-6). The ethylene polymer multilayer film is stretched. The physical properties and the like of the obtained biaxially stretched ethylene polymer multilayer film were measured by the methods described above. The results are shown in Table 1. [Comparative Example 1] The same procedure as in Example 1 was carried out except that the ethylene polymer composition (B-1) used in Example 1 was used instead of the above ethylene polymer composition (A-2-1). A biaxially stretched ethylene polymer multilayer film. The physical properties and the like of the obtained biaxially stretched ethylene polymer multilayer film were measured by the method described above. The results are shown in Table 1. [Comparative Example 2] The same procedure as in Example 1 was carried out except that the ethylene polymer composition (B-1) used in Example 5 was used instead of the above ethylene polymer composition (A-2-1). A biaxially stretched ethylene polymer multilayer film. The physical properties and the like of the obtained biaxially stretched ethylene polymer multilayer film were measured by the method described above. The results are shown in Table 1. [Reference Example 1] 100142656 27 201228804 As Reference Example 1, the buckling resistance of a 60 μm thick non-stretched film composed of a vinyl hexa-hexene random copolymer having a density of 920 kg/m 3 was measured by the method described above. As a result, it was 750 / m 2 at 0 ° C, and the film was broken at -30 ° C and could not be measured. 100142656 28 201228804

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cdCDAI 3 0/0 face si/μ νφ music [m# 乐let recommended^3ί ^«Beer meal $ 波Αΰ 95932:001 201228804 It can be discerned from the results shown in Table 1, the density of the substrate layer is 905Kg/ Methylethylene·1-hexene random copolymer* (al_1) 36% by mass of ethylene polymer composition (A-2-1) biaxially stretched ethylene polymer multilayer film (Comparative Examples 1 and 2) The bag breaking rate under A is 88% and 100%, the bag breaking rate under condition b is 30% and 52%, and the average bag breaking times under condition c is ^$ times and 2.2 times, and the bagging strength is poor; Here, as shown in Examples 1 to 7, there is an ethylene-based polymer composition containing 40% by mass or more of an ethylene.α__fried random copolymer (b) having a density of 895 to 920 kg/m3 ( Β) The obtained biaxially stretched ethylene polymer multilayer film of the base material layer has an average number of times of bag breaking under condition C of 3.8 or more, and the bagging strength is excellent. Further, in the ethylene·α·olefin random copolymer (b) constituting the base material layer, the ratios of the first embodiment (b-2), the sixth embodiment (b-3), and the seventh embodiment (b-4). It is discriminated that when the hexene-b-hexene random copolymer (b-2) [density: 903 Kg/m3] having a low density in the range of 895 to 920 kg/m3 is used, the bagging strength is further improved. superior. In the above, a biaxially stretched ethylene polymer multilayer film comprising a vinyl polymer composition (Bq) containing 68% by mass of an ethylene phthalate random copolymer having a density of 905 Kg/m 3 is used in the substrate layer. The bag breaking rate under conditions A and b was 0%, and the average number of broken bags under condition C was 25.8, and the bagging strength was excellent. (Industrial Applicability) The biaxially stretched ethylene polymer multilayer film of the present invention has excellent bagging strength of 100142656 30 201228804, and is superior in buckling resistance, puncture resistance, transparency, and superior heat sealing property. Therefore, it is suitable for a package in which the contents are liquid or powder. 100142656 31

Claims (1)

201228804 VII. Patent application scope: 1. A biaxially stretched ethylene polymer multilayer film characterized by ethylene-containing random copolymer (b) 40 having a density of 895-920 Kg/m3. quality. / at least one side of the base layer obtained from the ethylene-based polymer composition (Β), the laminate has a density ranging from 91 〇 to 938 kg/m 3 and has a lower ethylene/α-olefin than the base layer. The surface layer obtained from the ethylene ruthenium polymer (Α) having a higher density of the copolymer (13) is obtained, and the base layer and the surface layer are biaxially stretched together. 2. The two-axis-stretched ethylene polymer multilayer film according to the first aspect of the patent application, wherein the surface layer obtained from the ethylene-based polymer (layer) is laminated on both surfaces of the base material layer. 3. The biaxially stretched ethylene polymer multilayer film according to claim 1 or 2, wherein the biaxially stretched ethylene polymer multilayer film has a stretching ratio of 3 to 14 times in the longitudinal direction (MD), and the transverse direction (TD) The stretching ratio is 3-14 times the range. 4. The two-axis extended ethylene polymer multilayer film of the first aspect of the patent application, wherein the density of the ethylene-based polymer composition (B) is in the range of 900 to 925 Kg/m3. 5. The two-axis extended ethylene polymer multilayer film as described in the first paragraph of the patent application, wherein the 'ethylene polymer (A) is an ethylene-based (X-olefin random copolymer) having a density of 895 to 925 Kg/m3. An ethylene copolymer composition (A-1) composed of a component of the ethylene-based polymer (a2) having a density of 926 to 970 kg/m3. 100142656 32 201228804 6. A 2-axis extension of ethylene as claimed in claim 1 Polymer multilayer film 'In the ethylene-based polymerization system, the ethylene-α-olefin random copolymer (al) having a density of 895 to 925 Kg/m 3 and the ethylene-based polymer having a density of 926 to 97 Å Kg/m 3 (a2) An ethylene copolymer composition (A-2) composed of a high-pressure process low-density polyethylene (a3) having a composition and a density of 910 to 935 kg/m3. 7. In the claims 1, 2 and 4 to 6 Any one of the two-axis extended ethylene polymer multilayer film formed by laminating a thermoplastic resin film on at least one side of the biaxially stretched ethylene polymer multilayer film. 8. The biaxially stretched ethylene according to the patent application 帛3 item The polymer multilayer film is at least one side of the biaxially stretched ethylene polymer multilayer film 9. Laminating a thermoplastic resin film. 9. As stated in the patent scope, item 7 of the two-axis extended ethylene polymer multilayer film, in which the 'thermoplastic resin film is formed by biaxial stretching. The 8-axis two-axis extended ethylene polymer multilayer film 'where the thermoplastic resin film is biaxially stretched. U. For example, the patent of the patent _ 7th axis extends the ethylene polymer multilayer film, wherein the thermoplastic resin is Any of a variety of vinegar, polyamine or polypropylene. 12. Shishen β patent, the second axis of the second extension of the ethylene polymer multilayer film, wherein the thermoplastic resin is a polyester, polyamine or polypropylene The type of armor material is composed of a two-axis extended ethylene polymer multilayer thin crucible which is formed by using a biaxially stretched ethylene polymer multilayer film as a hot melt adhesive layer. 100142656 33 201228804 14. A package The material is composed of a biaxially stretched ethylene polymer multilayer film of the eighth item of the patent application range in which a biaxially stretched ethylene polymer multilayer film is used as a hot melt adhesive layer. The packaging material is composed of a biaxially stretched ethylene polymer multilayer film of the ninth application patent range which uses a biaxially stretched ethylene polymer multilayer film as a hot melt adhesive layer. 100142656 34 201228804 IV. Designated representative figure : (1) The representative representative of the case is: No (2) The symbol of the symbol of the representative figure is simple: Yichuan, V. If there is a chemical formula in this case, please disclose the chemical formula that best shows the characteristics of the invention: None 100142656 201228804 • Invention patent Check the annual % and Guang Hung ^ --- S - I (The format and order of this manual, please do not change anything, ※ mark part" Do not ~ heart ※ application number _ · 100142656 G〇〇 «U) l > ※ application曰:100/11/22 ※". Classification: QM cans, invention name · (Chinese / English) cold you _ wheel:: biaxially stretched vinyl polymer multilayer film and packaging materials using the same II. Abstract: The object of the present invention is to provide a drop A biaxially stretched ethylene polymer film excellent in bag strength and excellent in buckling resistance, easy cracking property, and transparency. The present invention relates to a biaxially stretched ethylene polymer multilayer film characterized by having a vinyl polymerization of 40% by mass or more of an ethylene·α-olefin random copolymer (b) having a density of 895 to 920 kg/m 3 . At least one side of the substrate layer obtained from the bulk composition (1)), the laminate has a density ranging from 910 to 938 Kg/m 3 and has a higher density than the ethylene·α-olefin random copolymer (b) constituting the substrate layer. The surface layer obtained from the ethylene polymer (A) having a high density is formed by biaxially stretching the base layer and the surface layer together. III. English Abstracts of the Invention: 100142656 1 201228804 • The invention patent says that the year of inspection and the Guanghun Hungarian ^ ---S— I (The format and order of this manual, please do not change anything, ※ mark part) Do not ~ heart ※ application number _· 100142656 G〇〇«U)l> ※Application曰:100/11/22 ※”.Classification: QM cans, invention name··(Chinese/English) Cold you _ Wheel:: Two-axis extended ethylene polymerization BACKGROUND OF THE INVENTION 1. SUMMARY OF THE INVENTION An object of the present invention is to provide a biaxially stretched ethylene polymer film which is superior in bagging strength and which is excellent in buckling resistance, puncture resistance and transparency. The present invention relates to a biaxially-stretched ethylene polymer multilayer film characterized by comprising an ethylene-based polymer containing 40% by mass or more of an ethylene·α-olefin random copolymer (b) having a density of 895 to 920 kg/m 3 . At least one side of the substrate layer obtained by the composition (1)) has a density of 910 to 938 Kg/m 3 and a higher density of the ethylene·α-olefin random copolymer (b) constituting the substrate layer. Density of ethylene The surface layer obtained by the combination (A) is formed, and the base layer and the surface layer are biaxially stretched together. III. Abstract of the invention: 100142656 1 201228804 IV. Designated representative figure: (1) The representative representative figure of the case is: none (2) A brief description of the symbol of the representative figure: Benefit 4 5. If there is a chemical formula in this case, please disclose the chemical formula that best shows the characteristics of the invention: Yi 100142656