WO2023176214A1 - 二軸配向ポリアミドフィルム - Google Patents

二軸配向ポリアミドフィルム Download PDF

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Publication number
WO2023176214A1
WO2023176214A1 PCT/JP2023/004183 JP2023004183W WO2023176214A1 WO 2023176214 A1 WO2023176214 A1 WO 2023176214A1 JP 2023004183 W JP2023004183 W JP 2023004183W WO 2023176214 A1 WO2023176214 A1 WO 2023176214A1
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Prior art keywords
film
stretching
biaxially oriented
stress
polyamide
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Ceased
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PCT/JP2023/004183
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English (en)
French (fr)
Japanese (ja)
Inventor
考道 後藤
和茂 上田
彩芽 鳥居
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Toyobo Co Ltd
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Toyobo Co Ltd
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Application filed by Toyobo Co Ltd filed Critical Toyobo Co Ltd
Priority to CN202380026484.4A priority Critical patent/CN118843537A/zh
Priority to KR1020247028699A priority patent/KR20240164500A/ko
Priority to US18/845,616 priority patent/US20250187306A1/en
Priority to EP23770175.0A priority patent/EP4494847A4/en
Priority to JP2024507580A priority patent/JPWO2023176214A1/ja
Publication of WO2023176214A1 publication Critical patent/WO2023176214A1/ja
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B15/00—Layered products comprising a layer of metal
    • B32B15/04—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B15/08—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
    • B32B15/088—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin comprising polyamides
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C55/00—Shaping by stretching, e.g. drawing through a die; Apparatus therefor
    • B29C55/02—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets
    • B29C55/10—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets multiaxial
    • B29C55/12—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets multiaxial biaxial
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B15/00—Layered products comprising a layer of metal
    • B32B15/04—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B15/08—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
    • B32B15/085—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin comprising polyolefins
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B15/00—Layered products comprising a layer of metal
    • B32B15/20—Layered products comprising a layer of metal comprising aluminium or copper
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B27/08—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/18—Layered products comprising a layer of synthetic resin characterised by the use of special additives
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/18—Layered products comprising a layer of synthetic resin characterised by the use of special additives
    • B32B27/20—Layered products comprising a layer of synthetic resin characterised by the use of special additives using fillers, pigments, thixotroping agents
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/34—Layered products comprising a layer of synthetic resin comprising polyamides
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/36—Layered products comprising a layer of synthetic resin comprising polyesters
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
    • C08J5/18—Manufacture of films or sheets
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/116—Primary casings; Jackets or wrappings characterised by the material
    • H01M50/121—Organic material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2264/00—Composition or properties of particles which form a particulate layer or are present as additives
    • B32B2264/10—Inorganic particles
    • B32B2264/102—Oxide or hydroxide
    • B32B2264/1021—Silica
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/30—Properties of the layers or laminate having particular thermal properties
    • B32B2307/308—Heat stability
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/50—Properties of the layers or laminate having particular mechanical properties
    • B32B2307/514—Oriented
    • B32B2307/518—Oriented bi-axially
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/50—Properties of the layers or laminate having particular mechanical properties
    • B32B2307/54—Yield strength; Tensile strength
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/50—Properties of the layers or laminate having particular mechanical properties
    • B32B2307/58—Cuttability
    • B32B2307/581—Resistant to cut
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/70—Other properties
    • B32B2307/724—Permeability to gases, adsorption
    • B32B2307/7242—Non-permeable
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/70—Other properties
    • B32B2307/724—Permeability to gases, adsorption
    • B32B2307/7242—Non-permeable
    • B32B2307/7246—Water vapor barrier
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2457/00—Electrical equipment
    • B32B2457/10—Batteries
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2377/00—Characterised by the use of polyamides obtained by reactions forming a carboxylic amide link in the main chain; Derivatives of such polymers
    • C08J2377/02—Polyamides derived from omega-amino carboxylic acids or from lactams thereof
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

Definitions

  • the present invention relates to a polyamide film, which has excellent cold formability and is particularly suitable for use in applications where metal foil is laminated and then molded, such as for battery exteriors and pharmaceutical packaging.
  • Biaxially oriented polyamide films have excellent mechanical properties, thermal properties, and gas barrier properties, and are therefore widely used as packaging materials for various foods.
  • laminate-type lithium-ion battery exterior materials, press-through packs, and the like have been obtained by cold forming laminates made of resin films and metal foils.
  • the laminate for performing the above-mentioned cold forming generally has a structure such as polyethylene terephthalate film/biaxially stretched nylon film/aluminum foil/polypropylene film. (For example, see Patent Document 1)
  • the flexibility of the resin film is a factor that affects the moldability during cold forming. If the resin film has low flexibility, a strong load will be applied during elongation during cold forming, and pinholes and delamination may occur. On the other hand, if the resin film has too high flexibility, the effect of protecting the laminate containing metal foil as a base material will be weakened, and the resulting laminate will have poor physical properties. For this reason, it is important that the resin film has flexibility that is neither too high nor too low.
  • Patent Document 2 it is made of a laminate in which at least a base material layer, an adhesive layer, a metal layer, and a sealant layer are sequentially laminated, and the base material layer is arranged in the MD direction.
  • the sum (A+B) of stress at 50% elongation/stress value A at 5% elongation in the TD direction and stress value B at 50% elongation/5% elongation in the TD direction is set as a specific range. It is disclosed that good moldability can be obtained by this method.
  • biaxially oriented polyamide films produced by a biaxial stretching method tend to have physical properties that vary in the width direction of the film.
  • One of the causes of this variation in physical properties in the width direction is thought to be the bowing phenomenon.
  • the bowing phenomenon refers to the phenomenon that occurs during the heat setting process when high temperatures occur and shrinkage stress in the longitudinal direction occurs. While both ends of the film are held by the clips and restrained, the center of the film has weaker restraining force and shrinks. This is considered to be a phenomenon in which the main axis of orientation is tilted in an arcuate manner in the width direction.
  • the principal axes (angles showing the largest values) of physical property values such as thermal shrinkage rate, rate of dimensional change due to moisture absorption, and refractive index differ in the width direction of the film.
  • differences in physical property values such as diagonal heat shrinkage rate and dimensional change rate due to moisture absorption become large. That is, when cold forming is performed using a laminate using biaxially oriented polyamide films obtained by conventional methods, the main axis direction of orientation differs depending on the position in the width direction of the film, resulting in differences in formability.
  • stable moldability could not be obtained.
  • An object of the present invention is to provide a polyamide film that not only has excellent cold formability regardless of the position in the width direction of the film, but also has low dimensional accuracy after forming due to springback and excellent warpage resistance. There is a particular thing.
  • the present invention consists of the following configuration.
  • (Section 1) A biaxially oriented polyamide film containing 60% by mass or more of polyamide 6 and satisfying the following (a) to (c).
  • Puncture strength measured according to JIS Z 7102 is 0.5 N/ ⁇ m or more and 1.0 N/ ⁇ m or less
  • (b) Heat shrinkage rate at 160°C is 3.0 in both MD and TD directions % or less
  • Stress attenuation rate (%) 100 ⁇ ( ⁇ 0- ⁇ 1)/ ⁇ 0
  • ⁇ 0 represents the tensile stress value immediately after the 50% tensile strain is applied by applying a tensile force to the film at a tensile speed of 200 mm/min
  • ⁇ 1 represents the 50% tensile strain from ⁇ 0.
  • a laminate comprising the biaxially oriented polyamide film according to any one of Items 1 to 4, a gas barrier layer, and a sealant layer.
  • the laminate according to item 6 wherein the gas barrier layer includes metal foil.
  • the laminate according to item 6 wherein the gas barrier layer includes metal foil.
  • the battery exterior material comprising the laminate according to item 5 or 6.
  • the metal foil can appropriately follow the shape of the mold during molding, which not only suppresses the occurrence of pinholes and cracks, but also Since it has excellent springback and warpage resistance after molding, it has excellent dimensional accuracy in molding and can also contribute to improved productivity.
  • FIG. 2 is a schematic diagram showing a method of multi-stage stretching in the TD direction in a film manufacturing process.
  • the biaxially oriented polyamide film of the present invention is preferably formed from a polyamide resin composition containing 60% by mass or more of polyamide 6, more preferably 80% by mass or more of polyamide 6, still more preferably 90% by mass of polyamide 6. Contains % or more. By containing polyamide 6 in an amount of 60% by mass or more, excellent mechanical strength such as impact strength and gas barrier properties can be obtained.
  • Polyamide 6 used in the present invention is usually produced by ring-opening polymerization of ⁇ -caprolactam. Polyamide 6 obtained by ring-opening polymerization is usually removed with hot water to remove the lactam monomer, dried, and then melt-extruded using an extruder.
  • the relative viscosity of polyamide 6 is preferably 1.8 to 4.5, more preferably 2.6 to 3.2. If the relative viscosity is less than 1.8, the impact strength of the film may be insufficient. When it is larger than 4.5, the load on the extruder increases and it may be difficult to obtain an unstretched film before stretching.
  • polyamide 6 in the present invention those commercially available from Ube Industries, Ltd., BASF, etc. may be used. Particularly preferred is polyamide 6, which is commercially available for film use, has the above-mentioned relative viscosity, has a residual lactam monomer content of 1% by mass or less, and is end-blocked or end-modified and is less likely to produce lactam monomers when melted.
  • polyamide 6 chemically recycled from waste polyamide 6 products such as waste plastic products, waste tire rubber, fibers, and fishing nets can also be used.
  • waste polyamide 6 products such as waste plastic products, waste tire rubber, fibers, and fishing nets
  • depolymerization is performed to obtain ⁇ -caprolactam, which is purified and then polyamide 6 is obtained.
  • a method of polymerization can be used.
  • polyamide 6 which is obtained by mechanically recycling waste materials from the polyamide film manufacturing process, can be used in combination.
  • Mechanically recycled polyamide 6 is produced by collecting scrap materials such as non-standard and unshippable films produced during the production of biaxially oriented polyamide films and cut scraps (edge trims), and then melt-extruding or compression molding them. This is the raw material made into pellets.
  • the biaxially oriented polyamide film of the present invention may contain other thermoplastic resins in addition to polyamide 6, which is the main component, for the purpose of improving stretchability, pinhole resistance, ease of cutting, and the like. It may also contain small amounts of additives such as anti-blocking agents, lubricants, antistatic agents, heat stabilizers, and light stabilizers.
  • thermoplastic resins other than polyamide 6 used in the present invention include polyamide resins, polyester resins, polyolefin resins, acrylic resins, polycarbonate resins, polyvinyl resins, and urethane resins. Examples include polymers and copolymers.
  • the biaxially oriented polyamide film may include polyamide MXD6 and/or polyamide 6I to improve stretchability during film formation.
  • the content of these polyamides is preferably 20% by mass or less, more preferably 10% by mass or less, and even more preferably 5% by mass or less, based on the resin composition forming the biaxially oriented polyamide film.
  • the biaxially oriented polyamide film may contain a polyamide elastomer, a polyester elastomer, a polyolefin elastomer, etc. to improve pinhole resistance.
  • the biaxially oriented polyamide film may contain inorganic fine particles such as silica, kaolin, and zeolite, and crosslinked polymer fine particles such as acrylic and polystyrene as anti-blocking agents or lubricants. From the viewpoint of transparency and slipperiness, fine silica particles can be suitably used.
  • the biaxially oriented polyamide film may contain an organic lubricant having an effect of lowering surface energy as a lubricant within a range that does not cause problems in adhesiveness or wettability.
  • organic lubricants include ethylene bisstearamide (EBS). It is preferable to use the above-mentioned anti-blocking agent and lubricant in combination, since it is possible to impart excellent slipperiness and transparency to the film at the same time.
  • the method for obtaining the biaxially oriented polyamide film of the present invention is not particularly limited, and can be appropriately selected such as the T-die method or the inflation method.
  • the T-die method consists of (1) melt-extruding a polyamide resin composition into a sheet, cooling it on a cooling roll to form an unstretched sheet, and (2) moving the formed unstretched sheet in the MD direction (longitudinal direction). ) and a stretching step of stretching in the TD direction (width direction) perpendicular to the MD direction, (3) a heat setting step of heating and crystallizing the film after the stretching, (4) a heat setting step of heating and crystallizing the film after the above stretching. It includes a thermal relaxation step (sometimes referred to as a relaxing step) for removing residual strain, and (5) a cooling step for cooling the film after thermal relaxation.
  • the film of the present invention may have a single layer structure of at least one layer, or may have a laminated structure of two or more layers. There may be two layers, three layers, four layers, or five layers.
  • One embodiment for obtaining the biaxially oriented polyamide film of the present invention preferably includes a step of pre-stretching an unstretched sheet at a low magnification in the MD direction, and then main stretching it at a high magnification in the MD direction.
  • the MD preliminary stretching is preferably performed in one or two stages.
  • the total stretching ratio multiplied by each stretching ratio of MD preliminary stretching is preferably 1.005 times or more and 1.15 times or less. If the stretching ratio in the MD preliminary stretching is too low, it is difficult to obtain the effect of improving hygroscopic distortion, which will be described later. On the other hand, by setting the preliminary stretching ratio to 1.15 times or less, the progress of oriented crystallization is prevented, and the stretching stress in the subsequent MD main drawing becomes too high and breakage occurs during the main drawing or TD drawing. Can be suppressed.
  • the temperature of the MD preliminary stretching is [glass transition temperature of the polyamide resin composition (unit: °C, hereinafter abbreviated as Tg) + 20] °C or higher, [low-temperature crystallization temperature of the polyamide resin composition (unit: °C, hereafter abbreviated as Tc)] It is preferable to carry out the reaction at a temperature of +20]°C or lower.
  • Tg and Tc are values obtained by measurement by the method described in Examples.
  • stretching at a temperature of (Tc+20)°C or lower it is possible to prevent thermal crystallization from proceeding and suppress breakage in the TD stretching process.
  • a more preferable stretching temperature is (Tg+30)°C or higher and (Tc+10)°C or lower.
  • known longitudinal stretching methods such as hot roll stretching and infrared radiation stretching can be used.
  • the MD main stretching is preferably performed in two or more stages.
  • the magnification of the first stage MD main stretching is preferably 1.1 times or more and 2.9 times or less. If the stretching ratio in the first stage of main longitudinal stretching is too low, no stretching effect can be obtained. On the other hand, by setting the first stage stretching ratio to 2.9 times or less, progress of oriented crystallization can be prevented.
  • the first stage stretching temperature in the above MD main stretching is preferably carried out at a temperature of (Tg+20)°C or higher and (Tc+20)°C or lower. If the stretching temperature is less than (Tg + 20)°C, the stretching stress will be high and it will be easy to break during TD stretching, and if it exceeds (Tc + 20)°C, there is a risk that thickness unevenness will become large. More preferably, the temperature is at least (Tg+25)°C and at most (Tc+10)°C.
  • a known MD stretching method such as hot roll stretching or infrared radiation stretching can be used.
  • the magnification of MD main stretching in the second and subsequent stages can be set so that the total stretching ratio multiplied by each stretching ratio including the MD preliminary stretching ratio is 2.8 times or more and 5.0 times or less. It is preferably 3.0 times or more and 3.8 times or less, and still more preferably 3.0 times or more and 3.6 times or less. If it is less than 2.8 times, the variation in the physical properties of the biaxially oriented film in the width direction will be reduced, but the strength in the longitudinal direction may be reduced. If the total longitudinal stretching ratio becomes too large, the effect of reducing the variation in the physical properties of the biaxially oriented film in the width direction may not be achieved.
  • the second stage stretching temperature in the MD main stretching is preferably (Tg+20)°C or higher and (Tc+20)°C or lower, more preferably (Tg+25)°C or higher and (Tc+10)°C or lower. If the stretching temperature is less than (Tg+20)°C, the stretching stress may be high and the film may be easily broken during TD stretching, and if it exceeds (Tc+20)°C, thickness unevenness may become large.
  • the second stage of MD main stretching is preferably a hot roll stretching method.
  • the heat roll it is preferable to use a ceramic roll having a surface roughness Ra of 0.2 ⁇ m or less. If a roll with Ra larger than 0.2 ⁇ m is used, there is a risk that the film will be stretched while slipping on the roll, which is not preferable as it will cause scratches on the film surface. Further, since the stretching start point on the rolls becomes non-uniform in the width direction or varies, there is a possibility that thickness unevenness may occur.
  • Ra refers to center line average roughness, which is the average height of unevenness (unit: ⁇ m), and is a value specified by JIS B 0601.
  • the stretching process it is preferable that there is a relaxing process in the MD direction (hereinafter also referred to as MD relaxing) between the stretching process in the MD direction and the subsequent stretching process in the TD direction.
  • the lower limit of the MD relaxation rate is preferably 1%, more preferably 3%, particularly preferably 5%.
  • the upper limit of the MD relaxation rate is preferably 10%, more preferably 8%, particularly preferably 6%.
  • the method of MD relaxing is not particularly limited, but for example, a method of heating with a hot air heater and then performing a relaxing treatment using a speed difference between rolls may be mentioned.
  • the lower limit of the stretching temperature in the TD direction is preferably 90°C, more preferably 100°C, particularly preferably 110°C. When the temperature is 90° C. or higher, stretching stress can be lowered, so springback and curling after molding can be suppressed.
  • the upper limit of the stretching temperature in the TD direction is preferably 140°C, more preferably 130°C, particularly preferably 120°C. When the stretching temperature in the TD direction exceeds 140° C., not only the film formability deteriorates, but also the orientation of the obtained film in the TD direction becomes weak, so that the moldability may deteriorate.
  • the lower limit of the stretching ratio in the TD direction is preferably 2.5 times, more preferably 3.0 times, particularly preferably 3.5 times. When it is 2.5 times or more, not only the mechanical strength and thickness unevenness of the film are improved, but also the moldability is improved.
  • the upper limit of the stretching ratio in the TD direction is preferably 5.0 times, more preferably 4.5 times, particularly preferably 4.0 times. By making it 5.0 times or less, it is possible to suppress the increase in orientation in the TD direction, and to suppress the occurrence of springback and curling after molding.
  • Multi-stage stretching is the process of applying two or more stretching steps to the normal one-stage stretching, that is, a linear stretching pattern, as shown in an example in Figure 1, and reduces the stretching stress applied during stretching in the TD direction. can do. As a result, even at the same stretching ratio, it is possible to prevent the orientation in the TD direction from becoming too high, and it is possible to suppress springback and curling after molding.
  • the multi-stage stretching in the TD direction is preferably from 2 stages to 5 stages.
  • Multi-stage stretching is preferable because it is possible to change the stretching temperature and the stretching stress for each stretching, and it is possible to lower the stretching stress during stretching in the TD direction. If the stretching is two or more stages, the stretching stress can be lowered, and even if the stretching ratio is the same, the orientation in the TD direction can be prevented from becoming too high, and springback and curling after molding can be suppressed. . When the stretching is five stages or less, it is possible to prevent the equipment from becoming too large. In multistage stretching, it is preferable to use a temperature pattern in which a temperature difference of 2° C.
  • a zone having a constant length can be appropriately provided after each stretching stage.
  • the internal stress generated during stretching is alleviated in the constant length zone, making it possible to further reduce the stretching stress during the next stretching. Even if there is, it is possible to prevent the orientation in the TD direction from becoming too high, and it is possible to suppress springback and curling after molding.
  • the lower limit of the heat setting temperature in the heat setting step is preferably 170°C, more preferably 180°C, particularly preferably 190°C. When the temperature is 170°C or higher, the thermal shrinkage rate can be reduced.
  • the upper limit of the heat setting temperature is preferably 230°C, more preferably 220°C, particularly preferably 210°C. When the temperature is 230° C. or lower, a decrease in mechanical strength due to the biaxially oriented polyamide film becoming brittle can be suppressed.
  • the lower limit of the relaxation rate in the TD direction in the thermal relaxation step is preferably 0.5%, more preferably 1.0%, particularly preferably 2.0%. When it is 0.5% or more, the heat shrinkage rate in the TD direction can be kept low.
  • the upper limit of the relaxation rate in the TD direction is preferably 10%, more preferably 8%, particularly preferably 6%. If it is 10% or less, it is possible to prevent the occurrence of slack, etc., and improve flatness.
  • the biaxially oriented polyamide film of the present invention can also be subjected to corona treatment, coating treatment, flame treatment, etc. in order to further improve adhesiveness and wettability.
  • the above treatment can also be carried out during the manufacturing process of the biaxially oriented polyamide film.
  • a mill roll or a slit roll may be unwound and processed.
  • the lower limit of the thickness of the biaxially oriented polyamide film of the present invention is preferably 5 ⁇ m, more preferably 10 ⁇ m. When the thickness is 5 ⁇ m or more, good mechanical properties and moldability can be obtained.
  • the upper limit of the thickness of the biaxially oriented polyamide film of the present invention is preferably 100 ⁇ m, more preferably 70 ⁇ m, particularly preferably 40 ⁇ m.
  • the lower limit of the puncture strength of the biaxially oriented polyamide film of the present invention is preferably 0.5 N/ ⁇ m, more preferably 0.6 N/ ⁇ m. Good moldability can be obtained when the puncture strength is 0.5 N/ ⁇ m or more.
  • the upper limit of the puncture strength of the biaxially oriented polyamide film of the present invention is not particularly limited, but is preferably 1.0 N/ ⁇ m or less. If it exceeds 1.0 N/ ⁇ m, the moldability improvement effect may be saturated.
  • the puncture strength (unit: N/ ⁇ m) in the present invention refers to the strength (unit: N ) divided by the film thickness (unit: ⁇ m).
  • the lower limit of the heat shrinkage rate in the MD direction and TD direction of the biaxially oriented polyamide film of the present invention is preferably 0.5%, more preferably 0.8%, and particularly preferably 1.0%.
  • the upper limit of the heat shrinkage rate in the MD direction and the TD direction is preferably 3.0%, more preferably 2.5%, particularly preferably 2.0%. When the content is 3.0% or less, it is possible to suppress dimensional changes when heated in a secondary processing step and reduce the occurrence of wrinkles.
  • the molded product is created by pushing the film into a mold of a predetermined shape, holding it in the pressed state for a certain period of time, and then pulling up the mold.
  • a force that tries to return the film to its original shape will act, increasing springback and causing the molded product to collapse.
  • dimensional accuracy may be reduced.
  • the present inventors have found that in a tensile stress relaxation test of the obtained biaxially oriented polyamide film, the springback can be reduced by controlling the stress reduction rate after holding for 2 seconds within a specific range.
  • the stress attenuation rate expressed by the following formula (1) is preferably 12% or more in both the MD direction and the TD direction, and 14 % or more is more preferable.
  • ⁇ 0 represents the value of the tensile stress of the film immediately after the 50% tensile strain is applied by applying a tensile force to the film at a pulling speed of 200 mm/min
  • ⁇ 1 50% from ⁇ 0. % tensile strain is held for 2 seconds.
  • the biaxially oriented polyamide film of the present invention has a stress at 30% elongation in the MD direction (F30 value) of the film at 25°C, and a stress at 30% elongation in the TD direction (F30 value) of Y(TD). ), it is preferable that the following formulas (2) and (3) are satisfied.
  • Formula (2) 100MPa ⁇ Y(MD) ⁇ 150MPa
  • Formula (3) 110MPa ⁇ Y(TD) ⁇ 200MPa
  • Excellent moldability can be obtained by setting the value of Y (MD) to 100 MPa or more.
  • the value of Y (MD) by setting the value of Y (MD) to 150 MPa or less, the stress of the film after molding is suppressed from becoming too large, and the springback and warping resistance after molding are reduced, resulting in good moldability.
  • excellent moldability can be obtained by setting the value of Y (TD) to 110 MPa or more.
  • By setting the value of Y (TD) to 200 MPa or less it is possible to suppress stress in the film after molding from becoming too large, reduce springback and warpage resistance after molding, and obtain good moldability. I can do it.
  • the biaxially oriented polyamide film of the present invention has a stress at 3% elongation in the MD direction (F3 value) of the film at 25°C, and a stress at 3% elongation in the TD direction (F3 value) of ), and when the value of Y(MD)/X(MD) is Z(MD) and the value of Y(TD)/X(TD) is Z(TD), the following formulas (4) and (5) It is preferable to satisfy the following.
  • Formula (4) 1.4 ⁇ Z(MD) ⁇ 2.2
  • the biaxially oriented polyamide film of the present invention preferably has a hygroscopic strain of 1.3% or less as measured by the measurement method shown in the Examples below. More preferably it is 1.1% or less. If the hygroscopic strain is greater than 1.3%, the direction of orientation of the main axis will differ depending on the position of the film, so stable moldability may not be obtained.
  • a printed layer may be laminated on the biaxially oriented polyamide film of the present invention.
  • aqueous and solvent-based resin-containing printing inks can be preferably used.
  • resins used in the printing ink include acrylic resins, urethane resins, polyester resins, vinyl chloride resins, vinyl acetate copolymer resins, and mixtures thereof.
  • Printing inks contain known additives such as antistatic agents, light blocking agents, ultraviolet absorbers, plasticizers, lubricants, fillers, colorants, stabilizers, lubricants, antifoaming agents, crosslinking agents, antiblocking agents, and antioxidants. The agent may also be included.
  • the printing method for providing the printing layer is not particularly limited, and known printing methods such as offset printing, gravure printing, and screen printing can be used.
  • known drying methods such as hot air drying, hot roll drying, and infrared drying can be used.
  • the present invention further provides a laminate in which a biaxially oriented polyamide film is provided with a gas barrier layer such as an inorganic thin film layer or a metal foil.
  • the inorganic thin film layer is a thin film made of metal or inorganic oxide.
  • the material forming the inorganic thin film layer is not particularly limited as long as it can be made into a thin film, but from the viewpoint of gas barrier properties, inorganic materials such as aluminum, silicon oxide (silica), aluminum oxide (alumina), and a mixture of silicon oxide and aluminum oxide are used. Oxides are preferred. In particular, a composite oxide of silicon oxide and aluminum oxide is preferred from the standpoint of achieving both flexibility and denseness of the thin film layer.
  • the mixing ratio of silicon oxide and aluminum oxide is preferably such that Al is in the range of 20 to 70% by mass of the metal component.
  • the inorganic thin film layer can be made soft, and it is possible to prevent the thin film from being destroyed and the gas barrier properties from being deteriorated during secondary processing such as printing or lamination.
  • silicon oxide herein refers to various silicon oxides such as SiO and SiO 2 or mixtures thereof
  • aluminum oxide refers to various aluminum oxides such as AlO and AL 2 O 3 or mixtures thereof.
  • the thickness of the inorganic thin film layer is usually 1 to 100 nm, preferably 5 to 50 nm. When the thickness of the inorganic thin film layer is 1 nm or less, more satisfactory gas barrier properties can be easily obtained. On the other hand, a thickness of 100 nm or less is advantageous in terms of bending resistance and manufacturing cost.
  • the method for forming the inorganic thin film layer there are no particular limitations on the method for forming the inorganic thin film layer, and for example, known vapor deposition methods such as vacuum evaporation, sputtering, physical vapor deposition (PVD) such as ion plating, or chemical vapor deposition (CVD) may be used. Laws may be adopted as appropriate.
  • a typical method for forming an inorganic thin film layer will be explained using a silicon oxide/aluminum oxide thin film as an example.
  • a mixture of SiO 2 and Al 2 O 3 or a mixture of SiO 2 and Al is preferably used as the evaporation raw material.
  • Particles are usually used as these vapor deposition raw materials, and the size of each particle is preferably such that the pressure during vapor deposition does not change, and the preferable particle size is 1 to 5 mm.
  • heating methods such as resistance heating, high frequency induction heating, electron beam heating, laser heating, etc. can be adopted. It is also possible to introduce oxygen, nitrogen, hydrogen, argon, carbon dioxide, water vapor, etc. as a reactive gas, or to adopt reactive vapor deposition using means such as ozone addition or ion assist.
  • the film forming conditions can also be changed arbitrarily, such as by applying a bias to the object to be deposited (the laminated film to be subjected to vapor deposition), heating or cooling the object to be deposited.
  • the evaporation material, reaction gas, bias of the evaporation target, heating/cooling, etc. can be similarly changed when sputtering or CVD is employed.
  • a printed layer may be laminated on the inorganic thin film layer.
  • the gas barrier layer made of metal oxide is not a completely dense film, but is dotted with minute defects.
  • the resin in the protective compatible resin composition penetrates into the defective parts of the metal oxide layer, As a result, the effect of stabilizing gas barrier properties can be obtained.
  • the gas barrier performance of the laminated film can be greatly improved.
  • Examples of the protective layer include urethane-based, polyester-based, acrylic-based, titanium-based, isocyanate-based, imine-based, polybutadiene-based resins, etc., to which curing agents such as epoxy-based, isocyanate-based, and melamine-based resins are added.
  • Examples of solvents used in forming the protective layer include aromatic solvents such as benzene and toluene; alcohol solvents such as methanol and ethanol; ketone solvents such as acetone and methyl ethyl ketone; ethyl acetate and butyl acetate. and polyhydric alcohol derivatives such as ethylene glycol monomethyl ether.
  • the metal foil used for the gas barrier layer various metal foils such as aluminum and stainless steel can be used, and aluminum foil is preferable from the viewpoints of moisture resistance, workability such as spreadability, and cost.
  • the aluminum foil a general soft aluminum foil can be used. Among these, aluminum foil containing iron is preferred because it has excellent pinhole resistance and spreadability during molding.
  • the iron content in the iron-containing aluminum foil (100% by mass) is preferably 0.1 to 9.0% by mass, more preferably 0.5 to 2.0% by mass. If the iron content is at least the lower limit, pinhole resistance and spreadability will be excellent. If the iron content is 9.0% by mass or less, it has excellent flexibility.
  • the thickness of the metal foil is preferably 9 to 200 ⁇ m, more preferably 15 to 100 ⁇ m, from the viewpoint of barrier properties, pinhole resistance, and workability.
  • Layers of other materials may be laminated on the laminate of the present invention.
  • a method of bonding a biaxially oriented polyamide film and a biaxially oriented polyester film together after film formation, or a method of bonding them together during film formation can be adopted.
  • the laminate of the present invention can be used as a packaging material for cold forming by further forming a heat-sealable resin layer called a sealant (also referred to as a sealant layer) on the biaxially oriented polyamide film and the gas barrier layer.
  • a heat-sealable resin layer called a sealant is further formed on the biaxially oriented polyester film, the biaxially oriented polyamide film, and the gas barrier layer, and the film is used as a packaging material for cold forming. can be used.
  • the sealant layer is usually formed by extrusion lamination or dry lamination.
  • the sealant layer examples include a resin film made of a polyolefin resin or an acid-modified polyolefin resin obtained by graft-modifying a polyolefin resin with an acid such as maleic anhydride.
  • the polyolefin resin include low-density, medium-density, and high-density polyethylene; ethylene- ⁇ -olefin copolymer; homo, block, or random polypropylene; propylene- ⁇ -olefin copolymer, and the like. These polyolefin resins may be used alone or in combination of two or more.
  • the sealant layer may be a single layer film or a multilayer film, and may be selected depending on the required function. For example, in terms of imparting moisture resistance, a multilayer film in which a resin such as ethylene-cyclic olefin copolymer or polymethylpentene is interposed can be used.
  • the sealant layer may also contain various additives such as flame retardants, slip agents, anti-blocking agents, antioxidants, light stabilizers, and tackifiers.
  • the thickness of the sealant layer is preferably 10 to 100 ⁇ m, more preferably 20 to 60 ⁇ m.
  • the laminate of the present invention can be formed between a biaxially oriented polyamide film and a biaxially oriented polyester film, between a biaxially oriented polyamide film and a gas barrier layer, between a biaxially oriented polyester film and a gas barrier layer, and/or between a gas barrier layer and a sealant.
  • a laminate can also be constructed by providing an adhesive layer, a printed layer, etc. between the layers.
  • the present invention provides a battery exterior material including a laminate including a biaxially oriented polyamide film, a gas barrier layer, and a sealant layer.
  • the present invention provides a battery exterior material that includes a laminate including a biaxially oriented polyester film, a biaxially oriented polyamide film, a gas barrier layer, and a sealant layer.
  • it is suitably used for battery exterior materials for laminated lithium ion batteries.
  • the invention provides a pharmaceutical packaging material.
  • the films and laminates were evaluated using the following measurement method. Unless otherwise specified, measurements were performed in a measurement room at 23° C. and 65% relative humidity.
  • Heat shrinkage rate of film Thermal shrinkage was measured using a dimensional change test method in accordance with JIS-C-2318, except that the test temperature was 160°C and the heating time was 10 minutes. Samples were cut out from the MD direction and from the TD direction and measured.
  • Stress decay rate of biaxially oriented film A test sample with a width of 15 mm and a length of 100 mm was cut out in the MD direction of the film. Using a tensile testing machine (Autograph AG-I manufactured by Shimadzu Corporation), 50% tensile strain was applied under the conditions of a gauge distance of 50 mm and a tensile speed of 200 mm/min. The tensile strain was maintained for 100 seconds after application, and changes in stress during that time were recorded. From the obtained holding time-stress graph, the stress value after 2 seconds of holding immediately after the application of 50% strain was read, and the stress attenuation rate after 2 seconds of holding was determined using the following formula (1).
  • ⁇ 0 represents the tensile stress of the film immediately after the 50% tensile strain is applied by applying a tensile force to the film at a pulling speed of 200 mm/min
  • ⁇ 1 represents the tensile stress of 50% from ⁇ 0. The stress value when tensile strain is maintained for 2 seconds is shown.
  • biaxially oriented polyester film//biaxially oriented polyamide film//aluminum foil//sealant layer were laminated in this order to produce a laminate.
  • the obtained laminate was placed in a die set mold (convex shape: 90 mm x 50 mm), and was pressurized at 23° C. with a press to perform drawing forming.
  • the drawing depth during molding was increased in 0.2 mm increments, and the maximum depth at which the laminate did not break was taken as the drawing depth, and the evaluation was made as follows.
  • B The drawing depth is between 6mm and less than 8mm.
  • C The drawing depth is between 4mm and less than 6mm.
  • D Drawing depth is less than 4mm
  • the sample that could be molded without breakage in the cold formability evaluation was placed on a horizontal table with the convex portion facing upward.
  • the average value of the height at which the four corners of the test piece after molding rose from the stand as the starting point was used as the average value of the warp height, and evaluation was performed according to the following criteria.
  • C The average warpage height is 5 mm or more and less than 10 mm.
  • D The average warpage height is 10 mm or more.
  • Polyamide 6 A polyamide 6 resin having an RV of 2.9 and a melting point (Tm) of 220°C was used.
  • Polyamide MXD6 A polyamide MDX6 resin having an RV of 2.2 and a melting point (Tm) of 238°C was used.
  • the relative viscosity, glass transition temperature, cold crystallization temperature, and melting point of the resin were measured by the following methods.
  • Relative viscosity The relative viscosity of a polyamide solution prepared by dissolving 0.25 g of the above raw material polyamide in 96% sulfuric acid to a concentration of 1.0 g/dl in a 25 ml volumetric flask was measured at 20°C.
  • Glass transition temperature Tg, cold crystallization temperature Tc and melting point Tm According to JIS K7121, a pan containing 10 mg of unstretched polyamide film was heated from 30°C to 280°C at a heating rate of 20°C/min in a nitrogen atmosphere using a DSC-60 differential scanning calorimeter manufactured by Shimadzu Corporation. The melting point Tm was measured during the process of heating up to °C, and after reaching 280°C, the pan containing the sample was immersed in liquid nitrogen to rapidly cool it, and then the pan was heated from 0°C to 280°C at a heating rate of 10°C/min. The temperature was raised to .degree. C., and the glass transition temperature Tg and cold crystallization temperature Tc during the heating process were measured.
  • Example 1 The raw materials were blended to contain 85% by mass of polyamide 6, 3% by mass of polyamide MXD6, and 12% by mass of a masterbatch of silica fine particles and ethylene bisamide. After adjusting the moisture content of the blended raw materials to 0.1% by mass, they were extruded as a molten film through a T-die using an extruder at a temperature of 260°C, and placed on a metal roll cooled to 30°C under a direct current high voltage. They were brought into close contact electrostatically by applying a load and cooled and solidified to obtain an unstretched film with a thickness of 200 ⁇ m. This unstretched film had a Tg of 41°C and a Tc of 69°C.
  • This unstretched film was stretched to 1.03 times using a roll stretching machine at a stretching temperature of 80°C as the first stage of MD pre-stretching, and then at a stretching temperature of 80°C as the second stage of MD pre-stretching. It was stretched 1.03 times.
  • the film was stretched to 2.1 times at 85°C, and further, as the second stage MD main stretching, it was stretched to 1.53 times at a stretching temperature of 70°C.
  • This MD stretched film was continuously introduced into a tenter, stretched 4.0 times in the TD direction at 130°C, heat-set at 210°C, and further subjected to 5.0% relaxation treatment in the TD direction at 210°C. went.
  • the film was cooled at 100° C., and one side of the film was subjected to corona treatment, and then the tenter clip gripping portions at both ends were trimmed to a width of 150 mm to obtain a mill roll of biaxially oriented polyamide film having a thickness of 15 ⁇ m and a width of 6000 mm.
  • Table 1 shows the evaluation results of the obtained film.
  • Example 2-3 A polyamide film was obtained in the same manner as in the example except that the temperature and magnification of MD preliminary stretching and the magnification of MD main stretching were changed as shown in Table 1.
  • Example 4 The raw materials were blended to contain 85% by mass of polyamide 6, 3% by mass of polyamide MXD6, and 12% by mass of a masterbatch of silica fine particles and ethylene bisamide. After adjusting the moisture content of the blended raw materials to 0.1% by mass, they were extruded as a molten film through a T-die using an extruder at a temperature of 260°C, and a DC high voltage was applied onto a metal roll cooled to 30°C. They were brought into close contact electrostatically with a load and cooled and solidified to obtain an unstretched film with a thickness of 200 ⁇ m. This unstretched film had a Tg of 41°C and a Tc of 69°C.
  • This unstretched film was stretched 1.07 times at a stretching temperature of 85° C. as MD preliminary stretching using a roll stretching machine.
  • the film was stretched to 2.0 times at 85°C
  • the second stage MD main stretching it was stretched to 2.0 times at a stretching temperature of 70°C.
  • the film immediately after MD stretching was passed through a heating furnace set at 85° C. using a hot air heater, and a 5% relaxation treatment was performed in the MD direction using the speed difference between the rolls at the entrance and exit of the heating furnace.
  • This MD stretched film was continuously introduced into a tenter and stretched 4.0 times in the TD direction at 130°C.
  • Heat setting treatment was performed at 210°C, and further relaxation treatment was performed at 210°C by 5.0% in the TD direction. Subsequently, the film was cooled at 100° C., and one side of the film was subjected to corona treatment, and then the tenter clip gripping portions at both ends were trimmed to a width of 150 mm to obtain a mill roll of biaxially oriented polyamide film having a thickness of 15 ⁇ m and a width of 6000 mm. Table 1 shows the evaluation results of the obtained film.
  • Example 5 The raw materials were blended to contain 85% by mass of polyamide 6, 3% by mass of polyamide MXD6, and 12% by mass of a masterbatch of silica fine particles and ethylene bisamide. After adjusting the moisture content of the blended raw materials to 0.1% by mass, they were extruded as a molten film through a T-die using an extruder at a temperature of 260°C, and a DC high voltage was applied onto a metal roll cooled to 30°C. They were brought into close contact electrostatically with a load and cooled and solidified to obtain an unstretched film with a thickness of 200 ⁇ m. This unstretched film had a Tg of 41°C and a Tc of 69°C.
  • This unstretched film was stretched by 1.03 times using a roll stretching machine at a stretching temperature of 80°C as the first stage of MD pre-stretching, and then at a stretching temperature of 80°C as the second stage of MD pre-stretching. Stretching was performed by 1.03 times at °C.
  • the film was stretched to 2.1 times at 85°C, and further, as the second stage MD main stretching, it was stretched to 1.53 times at a temperature of 70°C.
  • This MD stretched film was continuously guided to a tenter, and the stretching method in the tenter was set to three stages, with a fixed length area of 1 m between the first stage and second stage, and between the second stage and third stage. It was stretched in the TD direction.
  • Heat setting treatment was performed at 210°C, and further relaxation treatment was performed at 210°C by 5.0% in the TD direction. Subsequently, the film was cooled at 100° C., and one side of the film was subjected to corona treatment, and then the tenter clip gripping portions at both ends were trimmed to a width of 150 mm to obtain a mill roll of biaxially oriented polyamide film having a thickness of 15 ⁇ m and a width of 6000 mm. Table 1 shows the evaluation results of the obtained film.
  • Example 8 A biaxially oriented polyamide film was obtained in the same manner as in Example 1, except that MD preliminary stretching was not performed as shown in Table 2, and MD main stretching was performed in one stage at the temperature and magnification shown in Table 2. .

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