Film, multilayer film, and resin composition

Abstract

To provide a film comparatively excellent in rigidity, and impact resistance, a multilayer film, and a resin composition.SOLUTION: The film pertaining to the present invention is a film including at least one propylene-based polymer, and at least one ethylene-based polymer where the film has a sea-island type separation structure having a cross section containing an MD axis and an ND axis composed of a continuous phase and a discontinuous phase, and satisfies the following formulae (1)-(3). 15≤N2 (1) where, in the formula, N2 is a percentage (%) of an area occupied by the discontinuous phase in the cross section containing the MD axis and the ND axis. A1≤0.25 (2) where, in the formula, A1 is an average value (μm2) of areas per one discontinuous phase in the cross section containing the MD axis and the ND axis. L1≤0.195 (3) where, in the formula, L1 is an average value (μm) of circle-equivalent diameters per one discontinuous phase in the cross section containing the MD axis and the ND axis.SELECTED DRAWING: None

Description

[Technical Field]

[0001] The present invention relates to a film, a multilayer film, and a resin composition. [Background technology]

[0002] Various films are used as films for packaging foods and the like. Such films are required to have excellent transparency to ensure visibility of the contents. In addition, in recent years, there has been an increasing demand for reducing the volume of packaging materials from the perspective of reducing environmental impact, and this has led to a demand for thinner films. However, when films are made thinner, there is a problem that their rigidity, which is responsible for processability, and their impact resistance, which is responsible for protecting the contents, are reduced.

[0003] As a film that can be provided with rigidity and impact resistance, for example, Patent Document 1 discloses a film containing a propylene-based polymer and an ethylene-based polymer. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] International Publication No. 2019 / 086360 Summary of the Invention [Problem to be solved by the invention]

[0005] However, even with the above-mentioned films, there is still room for improvement in terms of rigidity and impact resistance, and there is a demand for films that are excellent in both rigidity and impact resistance.

[0006] The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a film, a multilayer film, and a resin composition that are relatively excellent in rigidity and impact resistance. [Means for solving the problem]

[0007] The film according to the present invention is a film containing at least one propylene-based polymer and at least one ethylene-based polymer, and has an islands-in-a-sea type phase-separated structure in a cross section including the MD axis and the ND axis, which is composed of a continuous phase and a discontinuous phase, and satisfies the following formulas (1) to (3): 15≦N2 (1) (In the formula, N2 represents the ratio (%) of the area occupied by the discontinuous phase in a cross section including the MD axis and the ND axis.) A1≦0.25 (2) (In the formula, A1 is the average value of the area per discontinuous phase in a cross section including the MD axis and the ND axis (μm 2 ) indicates. L1≦0.195 (3) (In the formula, L1 represents the average value (μm) of the circle-equivalent diameter per discontinuous phase in a cross section including the MD axis and the ND axis.)

[0008] The multilayer film according to the present invention includes the film described above.

[0009] The resin composition according to the present invention comprises a propylene polymer (1) having a melt flow rate of 0.1 g / 10 min or more and 20 g / 10 min or less, measured at a temperature of 230°C under a load of 2.16 kg, and a propylene polymer (2) having a melt flow rate of 0.1 g / 10 min or more and 5 g / 10 min or less, measured at a temperature of 190°C under a load of 2.16 kg, and a density of 880 kg / m 3 More than 910kg / m 3 an ethylene polymer (1) having a melt flow rate of 1 g / 10 min or more and 20 g / 10 min or less, as measured at a temperature of 190°C under a load of 2.16 kg, and a density of 910 kg / m 3 Super 930kg / m 3 an ethylene polymer (2) having a melt flow rate of 0.1 g / 10 min or more and 20 g / 10 min or less, measured at a temperature of 190°C under a load of 2.16 kg, and a density of 930 kg / m 3 Super 970kg / m 3 and an ethylene polymer (3) as follows: [Effects of the Invention]

[0010] According to the present invention, it is possible to provide a film, a multilayer film, and a resin composition that are relatively excellent in rigidity and impact resistance. [Brief explanation of the drawings]

[0011] [Figure 1] FIG. 1 is a TEM image of the film of Example 2. [Figure 2] FIG. 2 is a TEM image of the film of Comparative Example 1. DETAILED DESCRIPTION OF THE INVENTION

[0012] Hereinafter, embodiments of the present invention will be described, but the present invention is not limited to the following embodiments.

[0013] [film] The film according to the present embodiment contains at least one propylene-based polymer and at least one ethylene-based polymer, and has an islands-in-a-sea phase-separated structure in a cross section including the MD and ND axes, which is composed of a continuous phase and a discontinuous phase.

[0014] Here, the cross section including the MD axis and the ND axis refers to a cross section whose direction coincides with the plane determined by the axes of the MD and ND directions. In this specification, the film-forming direction (winding direction) is defined as the MD direction, the film thickness direction is defined as the ND direction, and the direction perpendicular to the MD and ND directions is defined as the TD direction.

[0015] The continuous phase is the sea portion of the islands-in-sea phase-separated structure and is formed from at least one propylene-based polymer, while the discontinuous phase is the island portion of the islands-in-sea phase-separated structure and is formed from at least one ethylene-based polymer.

[0016] The film according to this embodiment satisfies the following formula (1), and preferably satisfies the following formula (1'). 15≦N2 (1) 15≦N2≦60 (1')

[0017] In the formulas (1) and (1'), N2 represents the proportion (%) of the area occupied by the discontinuous phase in a cross section including the MD axis and the ND axis.

[0018] N2 can be controlled within the above range by using a predetermined material as the ethylene polymer and adjusting the content of the ethylene polymer relative to the total amount of the propylene polymer and the ethylene polymer.

[0019] When N2 is 15% or more, the area occupied by the discontinuous phase increases, and when the film breaks, the fracture surface becomes nonlinear and long because the crack propagates through the discontinuous phase. This makes the film less likely to break even when subjected to a large impact. In other words, such a film has excellent impact resistance. Furthermore, N2 is preferably 15% or more and 60% or less from the viewpoint of improving impact resistance.

[0020] The film according to this embodiment satisfies the following formula (2), and preferably satisfies the following formula (2'). A1≦0.25 (2) 0.05≦A1≦0.25 (2')

[0021] In the formulas (2) and (2'), A1 is the average area (μm ) per discontinuous phase in a cross section including the MD axis and the ND axis. 2 ) is shown.

[0022] A1 can be controlled within the above range by using a predetermined material as the ethylene polymer.

[0023] The film according to this embodiment satisfies the following formula (3), and preferably satisfies the following formula (3'). L1≦0.195 (3) 0.135≦L1≦0.195 (3')

[0024] In the formulas (3) and (3'), L1 represents the average value (μm) of the circle-equivalent diameter per discontinuous phase in a cross section including the MD axis and the ND axis.

[0025] L1 can be controlled within the above range by using a predetermined material as the ethylene polymer.

[0026] A1 is 0.25 μm 2 When A1 is 0.25 μm or less and L1 is 0.195 μm or less, the size of the discontinuous phase becomes small, so when the film breaks, the fracture surface becomes non-linear and long because the crack propagates through the discontinuous phase. This makes the film less likely to break even when subjected to a large impact. In other words, such a film has excellent impact resistance. Also, when A1 is 0.25 μm or less, the size of the discontinuous phase becomes small. 2 When L1 is 0.195 μm or less, the size of the soft and easily deformable discontinuous phase is small, so that the film is less likely to stretch even when pulled with a strong force. In other words, such a film has excellent rigidity.

[0027] From the viewpoint of improving impact resistance and rigidity, A1 is preferably 0.05 μm 2 More than 0.25μm 2 Furthermore, from the viewpoint of improving impact resistance and rigidity, L1 is preferably 0.135 μm or more and 0.195 μm or less.

[0028] The film according to this embodiment preferably satisfies the following formula (4), and more preferably satisfies the following formula (4'). 160≦N1 (4) 160≦N1≦400 (4')

[0029] In formulas (4) and (4'), N1 is the cross section of 100 μm including the MD axis and the ND axis. 2 The number of discontinuous phases contained in 2 ) is shown.

[0030] N1 can be controlled within the above range by using a predetermined material as the ethylene polymer and adjusting the content of the ethylene polymer relative to the total amount of the propylene polymer and the ethylene polymer.

[0031] N1 is 160 pieces / 100μm 2 By this, the number of discontinuous phases increases, and when the film breaks, the fracture surface becomes nonlinear and long because the crack propagates through the discontinuous phases. This makes the film less likely to break even when subjected to a large impact. In other words, such a film has better impact resistance. In addition, when N1 is 400 / 100 μm, 2 or less, the number of soft and easily deformable discontinuous phases is reduced, making the film less likely to stretch even when pulled with a strong force. In other words, such a film has superior rigidity.

[0032] The film according to this embodiment preferably satisfies the following formula (5), and more preferably satisfies the following formula (5'). L2≦0.075 (5) 0.050≦L2≦0.075 (5')

[0033] In formulas (5) and (5'), L2 represents the average minor axis length (μm) per discontinuous phase in a cross section including the MD and ND axes. The minor axis length refers to the length of the minor axis of an equivalent ellipse per discontinuous phase.

[0034] L2 can be controlled within the above range by using a predetermined material as the ethylene polymer.

[0035] When L2 is 0.075 μm or less, the length of the minor axis of the discontinuous phase is shortened, and the influence (reflection, scattering, refraction, etc.) on light traveling inside the film is reduced. This makes it easier for light to transmit. In other words, such a film has a relatively small haze value and therefore excellent transparency. Furthermore, from the viewpoint of improving transparency, L2 is preferably 0.050 μm or more and 0.075 μm or less.

[0036] N2, A1, L1 and L2 are cross sections including the MD axis and ND axis of the film (for example, 206.9 μm 2 ) can be calculated by photographing the film using a transmission electron microscope and analyzing the photographed image. 2 ) is photographed using a transmission electron microscope, the photographed image is analyzed to calculate the number of discontinuous phases (NO) contained in the cross section, and then NO is divided by, for example, 2.069, thereby obtaining the densitometric value.

[0037] From the viewpoint of improving rigidity and impact resistance, the film according to the present embodiment preferably comprises a propylene polymer (1) having a melt flow rate of 0.1 g / 10 min or more and 20 g / 10 min or less, measured at a temperature of 230°C under a load of 2.16 kg, and a propylene polymer (2) having a melt flow rate of 0.1 g / 10 min or more and 5 g / 10 min or less, measured at a temperature of 190°C under a load of 2.16 kg, and a density of 880 kg / m 3 More than 910kg / m 3 an ethylene polymer (1) having a melt flow rate of 1 g / 10 min or more and 20 g / 10 min or less, as measured at a temperature of 190°C under a load of 2.16 kg, and a density of 910 kg / m 3 Super 930kg / m 3 an ethylene polymer (2) having a melt flow rate of 0.1 g / 10 min or more and 20 g / 10 min or less, measured at a temperature of 190°C under a load of 2.16 kg, and a density of 930 kg / m 3 Super 970kg / m 3 and an ethylene polymer (3) as follows:

[0038] <Propylene polymer (1)> The propylene polymer (1) is a polymer containing more than 50% by mass of structural units derived from propylene, i.e., a propylene homopolymer or a propylene copolymer containing more than 50% by mass of structural units derived from propylene. Examples of structural units other than propylene contained in the propylene copolymer include structural units derived from ethylene and α-olefins having 4 to 12 carbon atoms.

[0039] Examples of the propylene-based copolymer include propylene-based random copolymers, such as propylene-ethylene random copolymers, propylene-α-olefin random copolymers, and propylene-ethylene-α-olefin terpolymers.

[0040] Examples of the α-olefins having 4 to 12 carbon atoms include 1-butene, 2-methyl-1-propene, 1-pentene, 2-methyl-1-butene, 3-methyl-1-butene, 1-hexene, 2-ethyl-1-butene, 2,3-dimethyl-1-butene, 2-methyl-1-pentene, 3-methyl-1-pentene, 4-methyl-1-pentene, 3,3-dimethyl-1-butene, 1-heptene, methyl-1-hexene, diethyl-1-propene, methyl-1-hexene, methyl-1-prop ... Examples include methyl-1-pentene, ethyl-1-pentene, trimethyl-1-butene, methylethyl-1-butene, 1-octene, methyl-1-pentene, ethyl-1-hexene, dimethyl-1-hexene, propyl-1-heptene, methylethyl-1-heptene, trimethyl-1-pentene, propyl-1-pentene, diethyl-1-butene, 1-nonene, 1-decene, 1-undecene, 1-dodecene, etc. Preferred are 1-butene, 1-pentene, 1-hexene, or 1-octene, and from the viewpoints of copolymerization properties, economy, etc., more preferred are 1-butene or 1-hexene, and even more preferred is 1-butene.

[0041] The propylene polymer (1) is preferably a propylene homopolymer or a propylene random copolymer, more preferably a propylene homopolymer or a propylene-ethylene random copolymer. The film according to this embodiment may contain only one type of propylene polymer (1), or may contain two or more types of propylene polymers (1) differing in the type or content of structural units.

[0042] When the propylene polymer (1) is a propylene-ethylene random copolymer, it contains structural units derived from ethylene in an amount of usually 0.1% by mass to 20% by mass, preferably 0.5% by mass to 10% by mass, more preferably 0.5% by mass to 6% by mass, and even more preferably 2% by mass to 6% by mass.

[0043] When the propylene polymer (1) is a propylene-ethylene-α-olefin terpolymer, it contains structural units derived from ethylene in an amount of usually 0.1 to 20% by mass, preferably 0.5 to 10% by mass, more preferably 0.5 to 5% by mass, and even more preferably 0.5 to 3% by mass. It also contains structural units derived from α-olefins in an amount of usually 0.1 to 20% by mass, preferably 0.5 to 10% by mass, more preferably 1 to 10% by mass, and even more preferably 3 to 10% by mass.

[0044] From the viewpoint of heat resistance, the melting point of the propylene polymer (1) is preferably 120° C. or higher and 170° C. or lower, more preferably 130° C. or higher and 170° C. or lower. The melting point is the temperature of the maximum peak of the melting endothermic curve measured using a differential scanning calorimeter.

[0045] The propylene polymer (1) has a melt flow rate (MFR) measured at 230°C under a load of 2.16 kg of 0.1 g / 10 min or more and 20 g / 10 min or less, preferably 0.1 g / 10 min or more and 10 g / 10 min or less, and more preferably 3 g / 10 min or more and 10 g / 10 min or less. The MFR of the propylene polymer is measured according to Method A specified in JIS K7210-1.

[0046] Examples of the method for producing the propylene polymer (1) include a method for homopolymerizing propylene in the presence of a Ziegler-Natta catalyst or a metallocene catalyst, and a method for copolymerizing propylene with an olefin other than propylene.

[0047] Ziegler-Natta catalysts include catalysts that use a combination of a titanium-containing solid transition metal component and an organometallic component, while metallocene catalysts include catalysts that use a combination of a transition metal compound of Groups 4 to 6 of the periodic table that has at least one cyclopentadienyl skeleton and a cocatalyst component.

[0048] Examples of the polymerization method include slurry polymerization and solution polymerization carried out in an inert hydrocarbon solvent, and liquid phase polymerization and gas phase polymerization carried out in the absence of a solvent.

[0049] In the production of the propylene polymer (1), the propylene polymer may be dried at a temperature equal to or lower than the melting point of the produced propylene polymer in order to remove residual solvents, ultralow molecular weight oligomers produced as by-products during the production, etc. Examples of the drying method include those described in JP-A-55-75410 and JP-A-2565753.

[0050] The propylene polymer (1) may be a propylene multistage polymer obtained by polymerizing the components constituting the propylene polymer (1) in two or more stages. The combination of components constituting the propylene multistage polymer may be a combination of propylene homopolymer components, a combination of a propylene homopolymer component and a propylene copolymer component, or a combination of propylene copolymer components. When at least two propylene polymer components are polymerized in multiple stages, the propylene multistage polymer is a propylene polymer composition containing at least two propylene polymer components.

[0051] The propylene-based multistage polymer preferably comprises a polymer component (A) containing 90% by mass or more of structural units derived from propylene, and a copolymer component (B) containing structural units derived from propylene and structural units derived from one or more selected from the group consisting of ethylene and α-olefins having 4 to 12 carbon atoms. The polymer component (A) is preferably a propylene homopolymer component. The copolymer component (B) is preferably a propylene copolymer component.

[0052] The content of structural units derived from propylene contained in polymer component (A) is 90% by mass or more and 100% by mass or less, preferably 95% by mass or more and 100% by mass or less. The content of structural units derived from ethylene contained in copolymer component (B) is usually 10% by mass or more and 50% by mass or less, preferably 15% by mass or more and 50% by mass or less, more preferably 20% by mass or more and 40% by mass or less. The content of copolymer component (B) contained in the propylene-based multistage polymer is usually 7% by mass or more and 70% by mass or less, preferably 10% by mass or more and 50% by mass or less, and more preferably 10% by mass or more and 40% by mass or less.

[0053] When the film according to the present embodiment contains two or more types of propylene polymers (1), the film preferably contains a propylene homopolymer and a propylene random copolymer. In another embodiment, the film may contain a propylene homopolymer or a propylene random copolymer as at least one type of propylene polymer (1) and a propylene multistage polymer as at least another type of propylene polymer (1), or may contain a propylene homopolymer as at least one type of propylene polymer (1) and a propylene multistage polymer as at least another type of propylene polymer (1).

[0054] <Ethylene-based polymers (1) to (3)> The ethylene polymers (1) to (3) are polymers containing more than 50% by mass of structural units derived from ethylene, i.e., ethylene homopolymers or ethylene copolymers containing more than 50% by mass of structural units derived from ethylene. Examples of structural units other than ethylene contained in the ethylene copolymers include structural units derived from propylene and α-olefins having 4 to 12 carbon atoms.

[0055] Examples of α-olefins having 4 to 12 carbon atoms include 1-butene, 1-pentene, 1-hexene, 1-heptene, 1-octene, 1-nonene, 1-decene, 4-methyl-1-pentene, and 4-methyl-1-hexene. Among these, α-olefins having 4 to 6 carbon atoms are preferred, and 1-hexene is more preferred. The structural unit derived from an α-olefin having 4 to 12 carbon atoms may be a structural unit derived from a single type of α-olefin, or may be a structural unit derived from two or more types of α-olefins.

[0056] The content of structural units derived from ethylene in the ethylene-based copolymer is preferably 70% by mass or more and 95% by mass or less, more preferably 75% by mass or more and 95% by mass or less, and even more preferably 80% by mass or more and 95% by mass or less.

[0057] The ethylene polymer (1) has a melt flow rate (MFR) measured at a temperature of 190°C under a load of 2.16 kg of 0.1 g / 10 min or more and 5 g / 10 min or less, preferably 0.1 g / 10 min or more and 4 g / 10 min or less. The density of the ethylene polymer (1) is 880 kg / m 3 More than 910kg / m 3 Preferably, it is 900 kg / m or less. 3 More than 910kg / m 3 The following is the result.

[0058] The ethylene polymer (2) has a melt flow rate (MFR) measured at a temperature of 190°C under a load of 2.16 kg of 1 g / 10 min or more and 20 g / 10 min or less, preferably 2 g / 10 min or more and 20 g / 10 min or less. The density of the ethylene polymer (2) is 910 kg / m 3 Super 930kg / m 3 Preferably, it is 910 kg / m or less. 3 Super 922kg / m 3 The following is the result.

[0059] The ethylene-based polymer (3) has a melt flow rate (MFR) measured at a temperature of 190 °C and a load of 2.16 kg of 0.1 g / 10 min or more and 20 g / 10 min or less, preferably 2 g / 10 min or more and 20 g / 10 min or less. Further, the density of the ethylene-based polymer (3) is 930 kg / m 3 more than 970 kg / m 3 or less, preferably 930 kg / m 3 more than 960 kg / m 3 or less.

[0060] The densities of the ethylene-based polymers (1) to (3) are measured according to Method A specified in JIS K7112-1980. Further, the MFRs of the ethylene-based polymers (1) to (3) are measured according to Method A specified in JIS K7210-1.

[0061] The ethylene-based polymers (1) to (3) can be produced, for example, using a metallocene catalyst. As the metallocene catalyst, for example, an olefin polymerization catalyst using a transition metal compound having a group having a cyclopentadiene-type anion skeleton (hereinafter sometimes referred to as a "metallocene-based transition metal compound") is used.

[0062] Examples of the metallocene-based transition metal compound include compounds represented by the formula MLaXn-a (where M is a transition metal atom of Group 4 of the periodic table of elements or the lanthanide series. L is a group having a cyclopentadiene-type anion skeleton or a group containing a hetero atom, and at least one is a group having a cyclopentadiene-type anion skeleton. A plurality of Ls may be crosslinked to each other. X is a halogen atom, a hydrogen atom or a hydrocarbon group having 1 to 20 carbon atoms. n represents the valence of the transition metal atom, and a is an integer satisfying 0 < a ≦ n).

[0063] Examples of the metallocene transition metal compound represented by the above formula include bis(1,3-n-butylmethylcyclopentadienyl)zirconium dichloride, bis(1,3-n-propylmethylcyclopentadienyl)zirconium dichloride, bis(n-butylcyclopentadienyl)zirconium dichloride, bis(1,3-dimethylcyclopentadienyl)zirconium dichloride, bis(1,3-diethylcyclopentadienyl)zirconium dichloride, ethylene bis(indenyl)zirconium dichloride, ethylene bis(4-methyl-1-indenyl)zirconium dichloride, and ethylene bis(4,5,6,7-tetrahydro-1-indenyl)zirconium dichloride.

[0064] The metallocene transition metal compound is preferably used in contact with an activating cocatalyst. Examples of the activating cocatalyst include an alumoxane compound and an organoaluminum compound in combination with a boron compound such as trityl borate or anilinium borate. The metallocene transition metal compound may also be used in combination with a particulate carrier, such as an inorganic carrier such as SiO2 or Al2O3, or an organic carrier such as a polymer of ethylene or styrene.

[0065] In the film according to this embodiment, the content of the propylene polymer (1) is preferably 50% by mass or more and 84% by mass or less, more preferably 50% by mass or more and 79% by mass or less, based on 100% by mass of the total amount of the propylene polymer and the ethylene polymer. The total content of the ethylene polymers (1) to (3) is preferably 16% by mass or more and 50% by mass or less, more preferably 21% by mass or more and 50% by mass or less, based on 100% by mass of the total amount of the propylene polymer and the ethylene polymer. By making the total content of the ethylene polymers (1) to (3) 50% by mass or less, the transparency of the film becomes more excellent.

[0066] More specifically, the content of the ethylene polymer (1) is preferably from 1 to 49% by mass, more preferably from 1 to 29% by mass, based on 100% by mass of the total amount of the propylene polymer and the ethylene polymer. The content of the ethylene polymer (2) is preferably from 1 to 49% by mass, more preferably from 1 to 19% by mass, based on 100% by mass of the total amount of the propylene polymer and the ethylene polymer. The content of the ethylene polymer (3) is preferably from 0.01 to 20% by mass, more preferably from 0.01 to 9% by mass, based on 100% by mass of the total amount of the propylene polymer and the ethylene polymer.

[0067] In the film according to the present embodiment, when the film contains two or more propylene polymers (1), and at least one propylene polymer (1) is a propylene homopolymer and at least another propylene polymer (1) is a propylene random copolymer, the total content of the propylene polymers (1) is preferably 50% by mass to 84% by mass, and more preferably 50% by mass to 79% by mass, based on 100% by mass of the total amount of the propylene polymers and the ethylene polymers. The content of the propylene homopolymer is preferably 50% by mass to 84% by mass, and more preferably 50% by mass to 79% by mass, based on 100% by mass of the total amount of the propylene polymers and the ethylene polymers. The total content of the ethylene polymers (1) to (3) is preferably 16% by mass to 50% by mass, and more preferably 21% by mass to 50% by mass, based on 100% by mass of the total amount of the propylene polymers and the ethylene polymers.

[0068] The film according to the present embodiment may be produced using pellets prepared by melt-kneading the propylene polymer (1) and the ethylene polymers (1) to (3) before film formation, or may be produced using a mixture prepared by pellet blending in which the propylene polymer (1) and the ethylene polymers (1) to (3) are mixed in the pellet state without being melted. The propylene polymer (1) may be a single type or two or more types. When melt-kneading is performed, examples of the melt-kneading method include a method in which the propylene polymer (1) and the ethylene polymers (1) to (3) are heated, melted, and kneaded using a single-screw extruder, a multi-screw extruder such as a twin-screw extruder, a roll mixer, a kneader, a Brabender plastograph, or a Banbury mixer. Among these, a multi-screw extruder such as a single-screw extruder or a twin-screw extruder is preferred.

[0069] The temperature during the melt-kneading is preferably 180°C or higher and 350°C or lower, and more preferably 180°C or higher and 320°C or lower.

[0070] The film according to this embodiment may contain additives or other resins as needed. Examples of additives include antioxidants, neutralizing agents, UV absorbers, antistatic agents, lubricants, nucleating agents, adhesives, antifogging agents, antiblocking agents, and melt flow rate adjusters. Examples of antioxidants include phenolic antioxidants, phosphorus-based antioxidants, and sulfur-based antioxidants. Hybrid antioxidants containing units that combine both phenolic and phosphorus-based antioxidant mechanisms in a single molecule can also be used. Other resins include elastomers such as styrene-butadiene-styrene copolymers and styrene-isoprene-styrene copolymer rubbers obtained by hydrogenating styrene-isoprene-styrene copolymers.

[0071] The film according to this embodiment can be formed by melt-kneading, for example, the propylene polymer (1), the ethylene polymers (1) to (3), and, if necessary, various additives.

[0072] The melt-kneading method can be carried out using a conventionally known method and apparatus. For example, the above materials are mixed using a mixing apparatus such as a Henschel mixer, a ribbon blender, or a tumble mixer, and then melt-kneaded. Alternatively, the above materials are continuously fed at a constant rate using a constant feeder to obtain a homogeneous mixture, and then the mixture is melt-kneaded using a single-screw or twin-screw or more extruder, a Banbury mixer, a roll kneader, or the like.

[0073] The melt-kneading temperature is preferably 190°C or higher and 320°C or lower, and more preferably 210°C or higher and 280°C or lower.

[0074] The thickness of the film thus formed is preferably 10 μm or more and 100 μm or less, and more preferably 10 μm or more and 50 μm or less.

[0075] The film according to this embodiment can be used as a sealant film.

[0076] [Multi-layer film] The multilayer film according to the present embodiment includes the above-described film. For example, the multilayer film may be a multilayer film obtained by laminating the above-described film with another film, such as a substrate film. Examples of the substrate film include films made of biaxially oriented polyester resin, biaxially oriented polyamide resin, biaxial polyolefin resin, etc.

[0077] The multilayer film can be produced by known film production methods such as the T-die method and the tubular method, with the T-die method being preferred.

[0078] Methods for laminating each film include a method using a feedblock die, in which molten resin flowing into the die from multiple extruders is combined in layers within the die, and a method using a multi-manifold die, in which molten resin flowing into the die from multiple extruders is sent to separate manifolds and combined in layers just before the lip of the die.

[0079] When the multilayer film according to the present embodiment is used as a sealant film and laminated with a base film, the thickness of the sealant film is preferably 10% to 30%, more preferably 15% to 30%, and even more preferably 15% to 25%, of the thickness of the multilayer film as 100%. Furthermore, the thickness of the base film is preferably 70% to 90%, more preferably 70% to 85%, and even more preferably 75% to 85% of the thickness of the multilayer film as 100%. When the thicknesses of the sealant film and base film are within the above ranges, the multilayer film is less likely to peel between the base film and the sealant film, has excellent heat seal strength and bag drop strength, and is less likely to develop surface irregularities (orange peel) when heated.

[0080] The thickness of the multilayer film is preferably 5 μm or more and 500 μm or less, and more preferably 30 μm or more and 150 μm or less.

[0081] The multilayer film can be used for packaging purposes, specifically for packaging food, textiles, miscellaneous goods, etc. The multilayer film may also be used as a material for forming packaging bags.

[0082] [Resin composition] The resin composition according to the present embodiment comprises a propylene polymer (1) having a melt flow rate of 0.1 g / 10 min or more and 20 g / 10 min or less, measured at a temperature of 230°C under a load of 2.16 kg, and a propylene polymer (2) having a melt flow rate of 0.1 g / 10 min or more and 5 g / 10 min or less, measured at a temperature of 190°C under a load of 2.16 kg, and a density of 880 kg / m 3 More than 910kg / m 3 an ethylene polymer (1) having a melt flow rate of 1 g / 10 min or more and 20 g / 10 min or less, as measured at a temperature of 190°C under a load of 2.16 kg, and a density of 910 kg / m 3 Super 930kg / m 3 an ethylene polymer (2) having a melt flow rate of 0.1 g / 10 min or more and 20 g / 10 min or less, measured at a temperature of 190°C under a load of 2.16 kg, and a density of 930 kg / m 3 Super 970kg / m 3 and an ethylene-based polymer (3) below: That is, the resin composition according to this embodiment is a resin composition that constitutes the above-mentioned film.

[0083] The resin composition according to this embodiment preferably has a melt flow rate (MFR) measured at 230°C under a load of 2.16 kg of 1 g / 10 min to 30 g / 10 min, more preferably 2 g / 10 min to 30 g / 10 min, and even more preferably 2 g / 10 min to 25 g / 10 min. Examples of methods for adjusting the MFR include adjusting the MFR of the propylene polymer (1) or the ethylene polymers (1) to (3) contained in the resin composition, and preparing a resin composition by melt-kneading the propylene polymer (1) and the ethylene polymers (1) to (3) in the presence of an organic peroxide. Examples of organic peroxides include 2,5-dimethyl-2,5-di(tert-butylperoxy)hexane, 1,3-bis(tert-butylperoxyisopropyl)benzene, and 3,6,9-triethyl-3,6,9-trimethyl-1,4,7-triperoxonane.

[0084] The film, multilayer film, and resin composition according to the present embodiment are not limited to the above embodiment, and various modifications are possible without departing from the spirit of the present invention. In addition, the configurations, methods, etc. of embodiments other than those described above may be arbitrarily adopted and combined, and the configurations, methods, etc. of one embodiment described above may be applied to the configurations, methods, etc. of other embodiments described above. [Example]

[0085] The present invention will be described in more detail below with reference to examples, although the present invention is not limited to these examples.

[0086] The measured values ​​of each item in the examples and comparative examples were measured by the following methods.

[0087] The content of the propylene polymer in the propylene polymer composition was obtained from the mass balance during each polymerization.

[0088] <Content of structural units derived from ethylene in propylene-ethylene copolymer constituting propylene-based polymer composition (unit: mass%)> First, if necessary, when the propylene polymer component (A) constituting the propylene polymer composition was obtained, the propylene polymer component (A) was subjected to IR spectrum measurement to determine the content (unit: mass%) of structural units derived from ethylene in the propylene polymer component (A). Next, the IR spectrum of the propylene-based polymer composition was measured, and the content (unit: mass%) of structural units derived from ethylene in the propylene-based polymer composition was determined in accordance with "(ii) Method for block copolymers" described on page 616 of Polymer Analysis Handbook (published by Kinokuniya Shoten in 1995). Then, the content (unit: mass %) of structural units derived from ethylene in the propylene polymer component (B) was calculated using the following formula (11). EB = (ET × 100 - EA × Pa) / Pb (11) (In the formula, EB represents the content of structural units derived from ethylene in the propylene polymer component (B). ET represents the content of structural units derived from ethylene in the propylene polymer composition. Pa represents the content of the propylene polymer component (A) in the propylene polymer composition. Pb represents the content of the propylene polymer component (B) in the propylene polymer component. EA represents the content of structural units derived from ethylene in the propylene polymer component (A).)

[0089] <Melting point (Tm, unit: °C)> Using a differential scanning calorimeter (Discovery DSC 250 manufactured by TA Instruments), approximately 5 mg of the polymer was melted at 230°C under a nitrogen gas atmosphere (nitrogen gas flow rate 50 ml / min), held for 5 minutes, and cooled to 0°C at a rate of 5°C / min. Next, the temperature was held at 0°C for 5 minutes, and then heated at a rate of 5°C / min up to 230°C, and the measurement was performed. The temperature of the maximum peak of the obtained melting endothermic curve was taken as the melting temperature (Tm). Using the same differential scanning calorimeter, approximately 5 mg of indium (In) was held at 110°C for 2 minutes under a nitrogen gas atmosphere (nitrogen gas flow rate 50 ml / min), and then heated at a rate of 5°C / min up to 180°C.The temperature of the maximum peak of the obtained melting endothermic curve was measured as the melting temperature (Tm), which was 156.6°C.

[0090] <Melt flow rate (MFR, unit: g / 10 min)> The melt flow rates of the propylene polymer and the propylene polymer composition were measured at a temperature of 230° C. and a load of 2.16 kg in accordance with Method A specified in JIS K7210-1. The melt flow rate of the ethylene polymer was measured at a temperature of 190° C. and a load of 2.16 kg in accordance with Method A specified in JIS K7210-1.

[0091] Density of ethylene polymer (unit: kg / m 3 )> The density of the ethylene polymer was measured according to the method specified in JIS K7112-1980, Method A. The sample was subjected to annealing as specified in JIS K6760-1995.

[0092] <Transmission electron microscope> The film was embedded in resin and then stained with an aqueous ruthenium tetroxide solution. A cross section containing the MD and ND axes of the film was then cut using a cryomicrotome to prepare an ultrathin sample with a thickness of 200 nm or less. The ultrathin sample was then placed on an observation mesh and photographed using a transmission electron microscope (Hitachi High-Tech Corporation, H-7650) at an accelerating voltage of 100 kV and a magnification of 20,000x to obtain image 1, which included the region to be selected in step 2) of the image analysis described below. As an example, TEM images of the films of Example 2 and Comparative Example 1 are shown in Figures 1 and 2, respectively.

[0093] <Image analysis> The photographed images were analyzed, and the black areas at the time of completion of the following step 6) were determined to be the continuous phase of the sea-island type phase separation structure, and the white areas were determined to be the discontinuous phase of the sea-island type phase separation structure. 2 The number of discontinuous phases included in the cross section including the MD axis and the ND axis (206.9 μm 2 ), the ratio of the area occupied by the discontinuous phase: N2 (unit: %), the average area per discontinuous phase: A1 (unit: μm 2 ), the average circle equivalent diameter per discontinuous phase: L1 (unit: μm), and the average minor axis length per discontinuous phase: L2 (unit: μm) were calculated. Analysis was performed using image analysis software "NS2K-Pro" (manufactured by Nano Systems Co., Ltd.). Analysis of the captured images was performed according to the following procedure.

[0094] 1) Open Image 1, select "Scale", execute "Set Scale (from Image)", and set the scale appropriately. 2) Select "Area Setting" and execute "Square" to select a rectangular area within the film that is 15.94 μm long in the MD direction and 12.98 μm long in the ND direction. 3) Select "Color Extraction" and execute "Monochrome Conversion". 4) Select "Binarization" and execute "Discriminant Analysis (9 Divisions)". 5) Select "Binary Processing" and execute "Black and White Inversion". 6) Select "Binary Processing", select "Image Selection by Feature Quantity", select "Area", execute "8-Neighborhood", and remove the following noise images with 0.001 μm 2 7) Select "Measurement", execute "Area", and calculate the number of discontinuous phases N0 included in the cross-section 206.9 μm including the MD axis and the ND axis, the proportion N2 (unit: %) of the area occupied by the discontinuous phase in the cross-section (206.9 μm 2 ), and the average value A1 (unit: μm 2 ) of the area per discontinuous phase. Then, according to the following formula (12), the number N1 (unit: number / 100 μm 2 ) of discontinuous phases included in the cross-section 100 μm including the MD axis and the ND axis is obtained. 2 2 ) N1 = N0 / 2.069 (12) 8) Select "Measurement", execute "Equivalent Circle Diameter", and calculate the average value L1 (unit: μm) of the equivalent circle diameter per discontinuous phase in the cross-section (206.9 μm 2 ) including the MD axis and the ND axis. 9) Select "Measurement", execute "Minor Axis Length", and calculate the average value L2 (unit: μm) of the minor axis length per discontinuous phase in the cross-section (206.9 μm 2 ) including the MD axis and the ND axis.

[0095] <Young's Modulus in the MD Direction (unit: MPa)> A test piece with a length of 120 mm (MD direction) and a width of 20 mm (TD direction) was taken from the film. Using a tabletop tensile testing machine manufactured by A&D Company, Ltd., an S-S curve (stress-strain curve) was obtained under the conditions of a chuck interval of 60 mm and a tensile speed of 5 mm / min, and the initial elastic modulus in the MD direction (Young's modulus in the MD direction) was measured.

[0096] ​​ <Pendulum impact strength (unit: kJ / m)> Test pieces measuring 2,000 mm in length (MD) and 100 mm in width (TD) were cut from the film. The pendulum impact strength (pendulum impact strength) of the test pieces was measured using a thermostatic chamber-equipped film impact tester (Toyo Seiki Seisakusho Co., Ltd.) with a 15 mm diameter hemispherical impact head and a thermostatic chamber temperature of 0°C.

[0097] <Haze (unit: %)> A test piece measuring 50 mm in length (MD) and 50 mm in width (TD) was taken from the film, and the haze of the test piece was measured using a haze meter NDH2000 (manufactured by Nippon Denshoku Industries Co., Ltd.) in accordance with JIS K7105.

[0098] The components used in the examples and comparative examples are as follows.

[0099] [Ethylene polymer (E1)] Sumikathene E FV402 (trade name) (manufactured by Sumitomo Chemical Co., Ltd.) was used, which is an ethylene-1-hexene copolymer. The melt flow rate of Sumikathene E FV402 measured at 190 °C was 3.8 g / 10 min, and the density was 913 kg / m 3 It was.

[0100] [Ethylene polymer (E2)] Sumikathene E FV103 (trade name) (manufactured by Sumitomo Chemical Co., Ltd.) was used, which is an ethylene-1-hexene copolymer. The melt flow rate of Sumikathene E FV103 measured at 190°C was 1.2 g / 10 min, and the density was 903 kg / m 3 It was.

[0101] [Ethylene polymer (E3)] Sumikathene E FV405 (trade name) (manufactured by Sumitomo Chemical Co., Ltd.) was used, which is an ethylene-1-hexene copolymer. The melt flow rate of Sumikathene E FV405 measured at 190°C was 3.8 g / 10 min, and the density was 923 kg / m 3 It was.

[0102] [Ethylene polymer (E4)] An ethylene-propylene copolymer, G1900 (trade name) (manufactured by Keiyo Polyethylene Co., Ltd.), was used. The melt flow rate measured at 190°C was 17 g / min, and the density was 956 kg / m 3 was

[0103] [Propylene-based polymer composition (PP1)] Propylene was polymerized in the gas phase using a Ziegler-Natta catalyst to obtain a propylene homopolymer (propylene polymer (P1)). The resulting propylene polymer (P1) had a melting point of 164°C and a melting rate of 2 g / 10 min. 100 parts by mass of the resulting propylene polymer (P1) were mixed with 0.01 parts by mass of hydrotalcite (Kyowa Chemical Industry Co., Ltd.), 0.09 parts by mass of Irganox 1010 (BASF), and 0.05 parts by mass of Sumilizer GP (Sumitomo Chemical Co., Ltd.), followed by melt-kneading to obtain a propylene polymer composition (PP1). The melt flow rate of the propylene polymer composition (PP1) was 2.5 g / 10 min. The components of the propylene polymer composition (PP1) are listed in Table 1.

[0104] [Table 1]

[0105] [Propylene polymer (P2)] Propylene and ethylene were copolymerized in the gas phase using a Ziegler-Natta catalyst to obtain a propylene-ethylene copolymer (P2). The resulting propylene-based polymer (P2) had a content of ethylene-derived structural units of 4% by mass, a melt flow rate of 6 g / 10 min, and a melting point of 142°C.

[0106] [Propylene-based polymer composition (PP3)] Propylene was polymerized in the gas phase using a Ziegler-Natta catalyst to obtain a propylene homopolymer (propylene polymer (P3)). The resulting propylene polymer (P3) had a melt flow rate of 7 g / 10 min and a melting point of 163°C. 100 parts by mass of the resulting propylene polymer (P3) were mixed with 0.25 parts by mass of ethylene polymer (E4), 0.20 parts by mass of propylene polymer (P2), 0.04 parts by mass of calcium stearate (Sakai Chemical Industry Co., Ltd.), 0.10 parts by mass of Sumilizer GP (Sumitomo Chemical Co., Ltd.), 0.005 parts by mass of calcium hydroxide, 0.1 parts by mass of Sylysia 550 (Fuji Silysia Chemical Ltd.), and 0.10 parts by mass of erucic acid amide (Nippon Fine Chemical Co., Ltd.), followed by melt-kneading to obtain a propylene polymer composition (PP3). The melt flow rate of the propylene polymer composition (PP3) was 7 g / 10 min. Table 2 shows the components contained in the propylene polymer composition (PP3).

[0107] [Table 2]

[0108] [Propylene-based polymer composition (PP4)] In the first step, propylene was polymerized in the gas phase using a Ziegler-Natta catalyst, and then propylene and ethylene were copolymerized in the gas phase in the second step to obtain a multistage propylene polymer consisting of a propylene homopolymer (P4-1) and a propylene-ethylene copolymer (P4-2). The resulting multistage propylene polymer contained 84% by mass of propylene polymer (P4-1) and 16% by mass of propylene polymer (P4-2), and the content of ethylene-derived structural units in propylene polymer (P4-2) was 40% by mass. 100 parts by mass of the obtained propylene-based multistage polymer was mixed with 0.01 parts by mass of hydrotalcite (Kyowa Chemical Industry Co., Ltd.), 0.10 parts by mass of Sumilizer GP (Sumitomo Chemical Co., Ltd.), 0.10 parts by mass of Irgafos 168 (BASF), and 0.10 parts by mass of erucamide (Nippon Fine Chemicals Co., Ltd.), and then melt-kneaded to obtain a propylene-based polymer composition (PP4). The melt flow rate of the propylene-based polymer composition (PP4) was 7 g / 10 min. The components contained in the propylene-based polymer composition (PP4) are shown in Table 3.

[0109] [Table 3]

[0110] [Example 1] 75% by mass of a propylene-based polymer composition (PP3), 10% by mass of an ethylene-based polymer (E1), and 15% by mass of an ethylene-based polymer (E2) were pellet-blended. The resulting mixture was melt-kneaded in a single extruder and then introduced into a T-die (die width 400 mm, lip opening 0.8 mm) and melt-extruded at a die temperature of 250°C. The extruded molten film was cooled and solidified on a chill roll rotating at 30 m / min at a cooling temperature of 40°C to obtain a film with a thickness of 30 μm. Analysis of images taken with a transmission electron microscope showed that the resulting film had a sea-island structure consisting of a continuous phase and a discontinuous phase. The polymer components contained in the film are shown in Table 4.

[0111] The obtained film was analyzed using a transmission electron microscope, and Young's modulus and pendulum impact strength measurements were performed. The results are shown in Table 5.

[0112] [Example 2] A monolayer film was produced and evaluated in the same manner as in Example 1, except that a mixture obtained by pellet-blending 75 mass% of the propylene polymer composition (PP3), 15 mass% of the ethylene polymer (E1), and 10 mass% of the ethylene polymer (E2) was used. The results are shown in Tables 4 and 5. As shown in Figure 1, the obtained film had a sea-island structure, in which the area occupied by the discontinuous phase, which is the island portion, was relatively large and the size of each discontinuous phase was relatively small.

[0113] [Example 3] A film was produced and evaluated in the same manner as in Example 1, except that a mixture obtained by pellet-blending 70% by mass of the propylene-based polymer composition (PP3), 15% by mass of the ethylene-based polymer (E1), and 15% by mass of the ethylene-based polymer (E2) was used. The obtained film had a sea-island structure. The results are shown in Tables 4 and 5.

[0114] [Comparative Example 1] A film was produced and evaluated in the same manner as in Example 1, except that a mixture obtained by pellet blending 70 mass% of the propylene polymer composition (PP4), 20 mass% of the ethylene polymer (E2), and 10 mass% of the ethylene polymer (E4) was used. The results are shown in Tables 4 and 5. As shown in Figure 2, the obtained film had a sea-island structure, in which the area occupied by the discontinuous phase, which was the island portion, was relatively small and the size of each discontinuous phase was relatively large.

[0115] Comparative Example 2 A film was produced and evaluated in the same manner as in Example 1, except that a mixture obtained by pellet-blending 70% by mass of the propylene polymer composition (PP4), 20% by mass of the ethylene polymer (E3), and 10% by mass of the ethylene polymer (E4) was used. The obtained film had a sea-island structure. The results are shown in Tables 4 and 5.

[0116] Comparative Example 3 A film was produced and evaluated in the same manner as in Example 1, except that a mixture obtained by pellet-blending 85% by mass of the propylene-based polymer composition (PP3) and 15% by mass of the ethylene-based polymer (E1) was used. The obtained film had a sea-island structure. The results are shown in Tables 4 and 5.

[0117] Comparative Example 4 A film was produced and evaluated in the same manner as in Example 1, except that a mixture obtained by pellet-blending 70% by mass of the propylene-based polymer composition (PP3) and 30% by mass of the ethylene-based polymer (E2) was used. The obtained film had a sea-island structure. The results are shown in Tables 4 and 5.

[0118] Comparative Example 5 A film was produced and evaluated in the same manner as in Example 1, except that a mixture obtained by pellet-blending 80% by mass of the propylene-based polymer composition (PP3) and 20% by mass of the ethylene-based polymer (E2) was used. The obtained film had a sea-island structure. The results are shown in Tables 4 and 5.

[0119] Comparative Example 6 A film was produced and evaluated in the same manner as in Example 1, except that a mixture obtained by pellet-blending 85% by mass of the propylene-based polymer composition (PP1) and 15% by mass of the ethylene-based polymer (E1) was used. The obtained film had a sea-island structure. The results are shown in Tables 4 and 5.

[0120] [Table 4]

[0121] [Table 5]

[0122] As can be seen from the results in Table 5, the films of the examples that satisfy all the constituent elements of the present invention have a higher Young's modulus and therefore superior rigidity, and have a higher pendulum impact strength and therefore superior impact resistance, compared to the films of the comparative examples. In addition, the films of the examples have a lower haze value and therefore superior transparency.

Claims

1. A film containing at least one propylene-based polymer and at least one ethylene-based polymer, The cross section including the MD axis and the ND axis has an islands-in-a-sea type phase separation structure consisting of a continuous phase and a discontinuous phase, The following formulas (1) to (3) are satisfied: an ethylene polymer (1) having a melt flow rate of 0.1 g / 10 min or more and 5 g / 10 min or less, measured at a temperature of 190°C under a load of 2.16 kg, and a density of 880 kg / m 3 or more and 910 kg / m 3 or less; an ethylene polymer (2) having a melt flow rate of 1 g / 10 min or more and 20 g / 10 min or less, measured at a temperature of 190°C under a load of 2.16 kg, and a density of more than 910 kg / m 3 and 930 kg / m 3 or less; an ethylene polymer (3) having a melt flow rate of 0.1 g / 10 min or more and 20 g / 10 min or less, measured at a temperature of 190°C under a load of 2.16 kg, and a density of more than 930 kg / m 3 and 970 kg / m 3 or less, the content of the ethylene polymer (2) is 1% by mass or more and 19% by mass or less, relative to 100% by mass of the total amount of the propylene polymer and the ethylene polymer; 15≦N2 (1) (In the formula, N2 represents the ratio (%) of the area occupied by the discontinuous phase in a cross section including the MD axis and the ND axis.) A1≦0.25 (2) (In the formula, A1 is the average area (μm ) per discontinuous phase in a cross section including the MD axis and the ND axis. ２ ) indicates. L1≦0.195 (3) (In the formula, L1 represents the average value (μm) of the circle-equivalent diameter per discontinuous phase in a cross section including the MD axis and the ND axis.)

2. The film according to claim 1, which satisfies the following formula (1'): 15≦N2≦60 (1') (In the formula, N2 has the same meaning as above.)

3. The film according to claim 1 or 2, which satisfies the following formula (2'): 0.05≦A1≦0.25 (2′) (In the formula, A1 has the same meaning as above.)

4. The film according to any one of claims 1 to 3, which satisfies the following formula (3'): 0.135≦L1≦0.195 (3′) (In the formula, L1 has the same meaning as above.)

5. The film according to any one of claims 1 to 4, further satisfying the following formula (4): 160≦N1 (4) (wherein N1 is the cross section of 100 μm including the MD axis and the ND axis) ２ The number of discontinuous phases contained in ２ ) indicates.

6. The film according to claim 5, which satisfies the following formula (4'): 160≦N1≦400 (4') (In the formula, N1 has the same meaning as above.)

7. The film according to any one of claims 1 to 6, further satisfying the following formula (5): L2≦0.075 (5) (In the formula, L2 represents the average minor axis length (μm) per discontinuous phase in a cross section including the MD axis and the ND axis.)

8. The film according to any one of claims 1 to 7, which satisfies the following formula (5'): 0.050≦L2≦0.075 (5′) (In the formula, L2 has the same meaning as above.)

9. The film according to any one of claims 1 to 8, comprising a propylene polymer (1) having a melt flow rate measured at a temperature of 230°C under a load of 2.16 kg of 0.1 g / 10 min or more and 20 g / 10 min or less.

10. The film according to any one of claims 1 to 9, wherein the melt flow rate of the ethylene polymer (2) is 2 g / 10 min or more and 20 g / 10 min or less.

11. A multilayer film comprising the film of any one of claims 1 to 10.

12. a propylene-based polymer (1) having a melt flow rate of 0.1 g / 10 min or more and 20 g / 10 min or less, as measured at a temperature of 230°C under a load of 2.16 kg; The melt flow rate measured at a temperature of 190°C and a load of 2.16 kg is 0.1 g / 10 min or more and 5 g / 10 min or less, and the density is 880 kg / m ３ More than 910kg / m ３ an ethylene polymer (1) which is The melt flow rate measured at a temperature of 190°C and a load of 2.16 kg is 1 g / 10 min or more and 20 g / 10 min or less, and the density is 910 kg / m ３ Super 930kg / m ３ an ethylene polymer (2) which is The melt flow rate measured at a temperature of 190°C and a load of 2.16 kg is 0.1 g / 10 min or more and 20 g / 10 min or less, and the density is 930 kg / m ３ Super 970kg / m ３ and an ethylene polymer (3) which is: the content of the ethylene polymer (2) is 1% by mass or more and 19% by mass or less, relative to 100% by mass of the total amount of the propylene polymer and the ethylene polymer;

13. The resin composition according to claim 12, wherein the ethylene polymer (2) has a melt flow rate of 2 g / 10 min or more and 20 g / 10 min or less.

Images