WO2023190269A1 - ガスバリア性積層体及びその製造方法 - Google Patents

ガスバリア性積層体及びその製造方法 Download PDF

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Publication number
WO2023190269A1
WO2023190269A1 PCT/JP2023/012060 JP2023012060W WO2023190269A1 WO 2023190269 A1 WO2023190269 A1 WO 2023190269A1 JP 2023012060 W JP2023012060 W JP 2023012060W WO 2023190269 A1 WO2023190269 A1 WO 2023190269A1
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WIPO (PCT)
Prior art keywords
gas barrier
metal
layer
barrier laminate
barrier layer
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
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PCT/JP2023/012060
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English (en)
French (fr)
Japanese (ja)
Inventor
宏 芦原
悟郎 荒木
淳 前原
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Unitika Ltd
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Unitika Ltd
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Publication date
Application filed by Unitika Ltd filed Critical Unitika Ltd
Priority to CN202380012281.XA priority Critical patent/CN117500665A/zh
Priority to US18/726,197 priority patent/US12479195B2/en
Priority to JP2023547501A priority patent/JP7357422B1/ja
Priority to CN202510203453.2A priority patent/CN120003123A/zh
Publication of WO2023190269A1 publication Critical patent/WO2023190269A1/ja
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
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    • 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
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    • 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
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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    • 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
    • B29C55/14—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets multiaxial biaxial successively
    • 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
    • B29C55/16—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets multiaxial biaxial simultaneously
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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    • C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
    • C08J5/18—Manufacture of films or sheets
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    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
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    • C08J7/048—Forming gas barrier coatings
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D123/00—Coating compositions based on homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Coating compositions based on derivatives of such polymers
    • C09D123/02—Coating compositions based on homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Coating compositions based on derivatives of such polymers not modified by chemical after-treatment
    • C09D123/04—Homopolymers or copolymers of ethene
    • C09D123/08—Copolymers of ethene
    • C09D123/0846—Copolymers of ethene with unsaturated hydrocarbons containing other atoms than carbon or hydrogen atoms
    • C09D123/0869—Acids or derivatives thereof
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    • B32B2255/10—Coating on the layer surface on synthetic resin layer or on natural or synthetic rubber layer
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    • B32B2255/00—Coating on the layer surface
    • B32B2255/26—Polymeric coating
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    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/30—Properties of the layers or laminate having particular thermal properties
    • B32B2307/306—Resistant to heat
    • B—PERFORMING OPERATIONS; TRANSPORTING
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    • B32B2307/724—Permeability to gases, adsorption
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    • B—PERFORMING OPERATIONS; TRANSPORTING
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Definitions

  • the present invention relates to a gas barrier laminate and a method for manufacturing the same.
  • the present invention relates to a gas barrier laminate that has excellent gas barrier properties even under high temperature and high humidity conditions.
  • Plastic films such as polyamide films have excellent strength, transparency, and moldability, and are therefore used in a wide range of applications as packaging materials. These plastic films have high permeability to gases such as oxygen, so when used for packaging general foods, retort-processed foods, cosmetics, medical supplies, agricultural chemicals, etc., oxygen and other gases that permeate through the film during long-term storage will pass through the film. Gas may cause deterioration of the contents.
  • gases such as oxygen
  • plastic films used in these packaging applications are required to have gas barrier properties, and in packaging foods containing moisture, gas barrier properties are also required under high humidity conditions.
  • a method of imparting gas barrier properties to a plastic film a method of laminating a gas barrier layer on the film has been proposed. Specifically, it is known to use a gas barrier layer composed of a polycarboxylic acid polymer, a polyalcohol polymer, and a metal compound.
  • Patent Documents 1 to 3 as a method for manufacturing a gas barrier laminate having gas barrier properties even under high humidity, a gas barrier layer containing a polycarboxylic acid ( A gas barrier laminate comprising II) is disclosed.
  • the gas barrier laminates disclosed in Patent Documents 1 to 3 cannot be used in an environment close to room temperature (for example, a temperature of 20°C and a humidity of 60% RH, a temperature of 20°C and a humidity of 90% RH, a temperature of 30°C and a humidity of 80% RH, etc.). ), but there is still room for improvement in the gas barrier performance under a high temperature/high humidity environment of, for example, a temperature of 40° C. and a humidity of 90% RH.
  • one way to improve gas barrier properties in high-temperature, high-humidity environments is to make the film thicker.
  • the main object of the present invention is to provide a gas barrier laminate that can exhibit excellent gas barrier properties even under high temperature and high humidity environments, even though it is a thinner film.
  • a gas barrier laminate having a total thickness of 100 ⁇ m or less comprising a plastic base material (I) and a gas barrier layer (II) laminated on the plastic base material, (1)
  • the plastic base material (I) includes a metal-containing layer containing at least one of metals and metal compounds and a resin component, (2) the total content of metals and metal compounds in the metal-containing layer is 0.1 to 70% by mass, (3) the gas barrier layer (II) contains polycarboxylic acid, (4)
  • the metal-containing layer and the gas barrier layer are laminated so as to be in direct contact with each other, (5) After the gas barrier laminate is treated with hot water for 30 minutes at a temperature of 95°C, the oxygen permeability in an environment of a temperature of 40°C and a humidity of 90% RH is 300 ml/( m2 ⁇ day ⁇ MPa) or less is,
  • the gas barrier laminate according to item 1 wherein the plastic substrate (I) is composed of a multilayer film.
  • the gas barrier laminate according to Item 1 or 2 wherein the metal-containing layer contains a polyamide resin or a polyester resin as a resin component.
  • 4. The gas barrier laminate according to any one of items 1 to 3 above, wherein the gas barrier layer (II) contains polyalcohol. 5.
  • the gas barrier laminate according to any one of items 1 to 4 which contains at least one of magnesium, calcium, and zinc as the metal or metal compound. 6.
  • a method of manufacturing a gas barrier laminate comprising: (1) A step of preparing a gas barrier layer forming coating solution by passing a raw material solution containing polycarboxylic acid through a filter with a filtration accuracy of 1.0 to 10.0 ⁇ m, and (2) at least one of a metal and a metal compound.
  • a method for producing a gas barrier laminate comprising a step of applying the coating liquid on at least the surface of the metal-containing layer of a plastic substrate (I) that includes a metal-containing layer containing a seed and a resin component. . 7. 7. The production method according to item 6, wherein the coating liquid for forming a gas barrier layer contains an antifoaming agent having an average particle size of 0.1 to 5.0 ⁇ m. 8. 8.
  • the gas barrier laminate according to any one of items 6 to 8 further comprising the step of subjecting the laminate coated with the gas barrier layer forming coating liquid to simultaneous biaxial stretching or sequential biaxial stretching. Production method. 10.
  • the main object of the present invention is to provide a gas barrier laminate that is a thinner film but can exhibit excellent gas barrier properties even in high temperature and high humidity environments.
  • the gas barrier laminate of the present invention has a gas barrier layer formed by a coating liquid that has undergone a specific filtration process, so even if the total thickness is 100 ⁇ m or less, it can withstand harsh conditions such as high temperature and high humidity. It can exhibit high gas barrier properties even under certain conditions.
  • the gas barrier laminate of the present invention is composed of thin materials with a total thickness of 100 ⁇ m or less, it exhibits excellent bag-making properties (thermal adhesive properties, etc.) when producing bags. In addition, it can also contribute to making products lighter, reducing the volume of materials, and lowering production costs.
  • the gas barrier laminate of the present invention can be manufactured by simply adding a metal or a metal compound to the raw material of the plastic base material, so that it is possible to produce the plastic base material including the metal-containing layer from the viewpoint of productivity, cost, etc. It also has great industrial benefits.
  • FIG. 1 is a diagram showing an example of the layer structure of the gas barrier laminate of the present invention.
  • FIG. 2 is a diagram showing another example of the layer structure of the gas barrier laminate of the present invention.
  • the gas barrier laminate of the present invention includes a plastic base material (I) and a gas barrier layer (II) laminated on the plastic base material, and has a total thickness of 100 ⁇ m or less.
  • a laminate (1)
  • the plastic base material (I) includes a metal-containing layer containing at least one of metals and metal compounds and a resin component, (2) the total content of metals and metal compounds in the metal-containing layer is 0.1 to 70% by mass, (3) the gas barrier layer (II) contains polycarboxylic acid, (4)
  • the metal-containing layer and the gas barrier layer are laminated so as to be in direct contact with each other, (5) After the gas barrier laminate is treated with hot water for 30 minutes at a temperature of 95°C, the oxygen permeability in an environment of a temperature of 40°C and a humidity of 90% RH is 300 ml/( m2 ⁇ day ⁇ MPa) or less is, It is characterized by
  • FIG. 1 shows an example of the layer structure of the laminate of the present invention.
  • the plastic base material 11 is composed of a single metal-containing layer 11a containing a metal or a metal compound (hereinafter, unless otherwise specified, both are collectively referred to as "metal component").
  • a gas barrier layer 12 is laminated on the surface of the metal-containing layer 11a. In this way, when the metal-containing layer 11a and the gas barrier layer 12 come into direct contact with each other, the metal component contained in the metal-containing layer 11a and the polycarboxylic acid contained in the gas barrier layer 12 react with each other. It can exhibit excellent gas barrier properties.
  • the plastic base material 11 includes a metal-containing layer 11a that includes a resin component and a metal component, and a resin-containing layer that does not include a metal component (hereinafter also referred to as "another resin-containing layer").
  • 11b and 11c of which a gas barrier layer 12 is laminated on the surface of the metal-containing layer 11a.
  • direct contact between the metal-containing layer 11a and the gas barrier layer 12 causes the metal component contained in the metal-containing layer 11a to react with the polycarboxylic acid contained in the gas barrier layer 12, resulting in better performance. It can exhibit excellent gas barrier properties.
  • the other resin layers are two layers in FIG. 1A, they may be one or more layers.
  • the plastic base material 11 is composed of a single layer of a metal-containing layer 11a containing a metal component, and gas barrier layers 12 are laminated on both surfaces of the metal-containing layer 11a. ing. In this case as well, direct contact between the metal-containing layer 11a and the gas barrier layer 12 causes the metal component contained in the metal-containing layer 11a to react with the polycarboxylic acid contained in the gas barrier layer 12, resulting in better performance. It can exhibit excellent gas barrier properties.
  • the plastic base material 11 is composed of a multilayer structure in which a metal-containing layer 11a containing a metal component is laminated on both sides of another resin-containing layer 11b.
  • a gas barrier layer 12 is laminated on each. That is, a layer structure in which another resin-containing layer 11b is sandwiched between two metal-containing layers is also included in the present invention.
  • the gas barrier layer (II) is laminated on at least one side of the plastic substrate (I)
  • the gas barrier layer (II) or another barrier layer may also be provided on the opposite side.
  • the present invention also includes a laminate having three or more metal-containing layers on one or both sides of a plastic base material.
  • the plastic base material serves as a supply source for supplying metal components to the gas barrier layer.
  • the plastic base material includes a metal-containing layer (layer containing a metal element) containing at least one of metals and metal compounds and a resin component. Therefore, the plastic base material may be a single layer consisting of one metal-containing layer, or may be a multilayer including a metal-containing layer and another layer.
  • the metal-containing layer may have two or more layers.
  • metals include, but are not limited to, monovalent metals such as lithium, sodium, potassium, rubidium, and cesium; magnesium, calcium, zirconium, zinc, copper, cobalt, iron, nickel, and aluminum; Metals having a valence of two or more are preferred from the viewpoint of gas barrier properties. Among these, metals with a high ionization tendency are preferred from the viewpoint of being easy to react with carboxylic acids. Specifically, it is preferably at least one of lithium, sodium, potassium, magnesium, calcium, and zinc, and particularly preferably at least one of magnesium, calcium, and zinc.
  • the metals constituting the metal compound are not particularly limited, but include monovalent metals such as lithium, sodium, potassium, rubidium, and cesium, and divalent metals such as magnesium, calcium, zirconium, zinc, copper, cobalt, iron, nickel, and aluminum.
  • Metals having a higher valence or higher are preferable from the viewpoint of gas barrier properties.
  • metals with a high ionization tendency are preferred from the viewpoint of being easy to react with carboxylic acids.
  • it is preferably at least one of lithium, sodium, potassium, magnesium, calcium, and zinc, and particularly preferably at least one of magnesium, calcium, and zinc.
  • the type of metal is not limited to one type, and two or more types may be used.
  • the metal compound may be any compound containing the above-mentioned metals, such as oxides, hydroxides, halides, carbonates, hydrogen carbonates, phosphates, inorganic salts such as sulfates, acetates, formates, etc.
  • examples include organic acid salts such as carboxylates such as stearate, citrate, malate, and maleate, and sulfonate.
  • Examples of the above metal compounds include lithium carbonate, sodium hydrogen carbonate, magnesium oxide, magnesium carbonate, magnesium hydroxide, magnesium acetate, calcium oxide, calcium carbonate, calcium hydroxide, calcium chloride, calcium phosphate, calcium sulfate, calcium acetate, and acetic acid. At least one of zinc, zinc oxide, zinc carbonate, etc. can be suitably used. In the present invention, at least one of oxides, hydroxides, carbonates, hydrogen carbonates, acetates and the like is particularly preferred.
  • magnesium salts such as magnesium oxide, magnesium carbonate, magnesium hydroxide, and magnesium acetate
  • calcium salts such as calcium carbonate and calcium acetate
  • divalent metals such as zinc salts such as zinc oxide and zinc acetate.
  • monovalent metal compounds such as lithium carbonate and sodium hydrogen carbonate
  • magnesium compounds such as magnesium oxide, magnesium carbonate, and magnesium hydroxide are preferable. . These can be used alone or in combination of two or more. Among these, at least one of oxides and carbonates is particularly preferred.
  • the form of the metal component is not limited, but it is usually preferable to be in the form of powder, and the average particle size thereof is not particularly limited, but it is usually sufficient as long as it is within the range of about 0.001 to 10.0 ⁇ m. In particular, it is more preferably 0.005 to 5.0 ⁇ m, even more preferably 0.01 to 2.0 ⁇ m, and most preferably 0.05 to 1.0 ⁇ m. In terms of improving the transparency of the plastic base material (I), it is preferable that the metal component has a small average particle diameter. On the other hand, metal components with an average particle diameter of less than 0.001 ⁇ m have a large surface area and therefore tend to aggregate, and coarse aggregates may be scattered in the film, which may deteriorate the mechanical properties of the base material.
  • the plastic base material (I) containing a metal component with an average particle size of more than 10.0 ⁇ m tends to break more frequently during film formation, resulting in lower productivity.
  • the average particle diameter exceeds 10.0 ⁇ m, it may be unsuitable when the plastic base material (I) is thin.
  • the particles of the metal component can be improved or improved in dispersibility, weather resistance, wettability with thermoplastic resin, heat resistance, transparency, etc. by subjecting them to surface treatment such as inorganic treatment or organic treatment.
  • surface treatment such as inorganic treatment or organic treatment.
  • the inorganic treatment include alumina treatment, silica treatment, titania treatment, zirconia treatment, tin oxide treatment, antimony oxide treatment, zinc oxide treatment, and the like.
  • organic treatments include treatments using fatty acid compounds, polyol compounds such as pentaerythritol and trimethylolpropane, amine compounds such as triethanolamine and trimethylolamine, silicone resins, and silicone compounds such as alkylchlorosilanes. Can be mentioned. These can be used alone or in combination of two or more.
  • the content of the metal component (total content of metal and metal compound) in the metal-containing layer is usually 0.1 to 70% by mass, preferably 0.1 to 50% by mass, and more preferably 0.1 to 50% by mass. It is more preferably 2 to 20% by mass, and most preferably 0.2 to 5% by mass. From the viewpoint of haze (transparency), it is preferably less than 5% by mass.
  • the content of the metal component in the metal-containing layer is less than 0.1% by mass, the crosslinked structure formed by reaction with the polycarboxylic acid of the gas barrier layer (II) will be reduced, and the resulting gas barrier laminate will be , gas barrier properties deteriorate.
  • a metal-containing layer in which the content of metal components exceeds 70% by mass is likely to break during stretching during film formation, resulting in a decrease in productivity and a decrease in mechanical properties.
  • the method for incorporating the metal component into the metal-containing layer is not particularly limited, and the metal component can be incorporated at any point in the manufacturing process.
  • a method of adding a metal component when polymerizing the thermoplastic resin constituting the metal-containing layer a method of kneading the thermoplastic resin and the metal component in an extruder, and a method of kneading the metal component in a high concentration.
  • examples include a method of manufacturing a masterbatch and adding it to a thermoplastic resin to dilute it (masterbatch method).
  • masterbatch method is preferably employed from the viewpoint of work efficiency.
  • the resin component constituting the metal-containing layer is not particularly limited, but usually one or more thermoplastic resins can be used.
  • thermoplastic resins include polyolefin resins such as polyethylene, polypropylene, and ionomers, polyamide resins such as nylon 6, nylon 66, nylon 46, nylon MXD6, and nylon 9T, polyethylene terephthalate, polyethylene isophthalate, polyethylene naphthalate, and polytrimethylene.
  • Polyester resins such as terephthalate, polytrimethylene naphthalate, polybutylene terephthalate, polybutylene naphthalate, polylactic acid, vinyl chloride, polystyrene resin, polycarbonate resin, polyarylate resin, ethylene-vinyl acetate copolymer, ethylene-vinyl alcohol copolymer At least one kind of polymer etc. is mentioned.
  • thermoplastic resins at least one of polyamide resins and polyester resins is preferred.
  • polyamide resin particularly nylon 6
  • polyester resin especially polyethylene terephthalate
  • polyester resin is more preferable in terms of excellent heat resistance and economical efficiency. Therefore, these resin components can be appropriately selected depending on the intended use of the laminate of the present invention.
  • the thermoplastic resin constituting the metal-containing layer may be a biomass-derived component, a chemically recycled resin component polymerized using recycled monomers or oligomers obtained by depolymerizing resin waste, etc. as a starting material, or a chemically recycled resin component polymerized using recycled oligomers as starting materials. Any component such as a recycled resin component, or a plurality of these components, is obtained by crushing the edge trimming waste, slit waste, etc., or melting and pelletizing the waste or defective film again. May be included.
  • the content of the resin component in the metal-containing layer is usually the balance excluding the metal component and additives added as necessary. Therefore, for example, it can be set to 99.9 to 30% by mass, it can also be set to 99.9 to 50% by mass, it can also be set to 99.8 to 80% by mass, and even 99.8 to 95% by mass. It is also possible to set it as mass %.
  • the metal-containing layer may contain a heat stabilizer, an antioxidant, a reinforcing material, and a pigment, as necessary, within a range that does not impede the effects of the present invention and does not adversely affect the performance of the plastic base material (I). , a deterioration inhibitor, a weathering agent, a flame retardant, a plasticizer, a preservative, an ultraviolet absorber, an antistatic agent, an antiblocking agent, and the like.
  • an inorganic lubricant or an organic lubricant other than the metal component may be added to the metal-containing layer for the purpose of improving the slip properties of the plastic base material (I), and it is particularly preferable to add silica. preferable.
  • the total content of these additives is usually about 5% by mass or less in the metal-containing layer, but is not limited thereto.
  • these additives also correspond to "at least one kind of metal and metal compound" in the metal-containing layer, the content of the additive is the content of "at least one kind of metal and metal compound”. shall be counted as.
  • the thickness of the metal-containing layer is not limited, but from the viewpoint of controlling the thickness, reactivity with the gas barrier layer, etc., it can usually be set appropriately within the range of about 5 to 95 ⁇ m, but in particular it should be set to 10 to 30 ⁇ m. is preferred. Therefore, the thickness can be set to 12 to 25 ⁇ m, for example.
  • the plastic base material (I) may be composed of a single metal-containing layer, or it may be composed of a multilayer consisting of a metal-containing layer and one or more other resin-containing layers. It's okay.
  • the other resin-containing layer may be a layer containing a thermoplastic resin.
  • the thermoplastic resin include at least one of the above thermoplastic resins that can be used in the metal-containing layer.
  • the thermoplastic resin contained in the metal-containing layer and the thermoplastic resin contained in the other resin-containing layer may be the same or different.
  • other resin-containing layers may contain at least one of the above additives that can be used in metal-containing layers, within a range that does not impede the effects of the present invention.
  • the total content of the additives may normally be about 5% by mass or less in the other resin-containing layers (in each layer if there is one or more other resin-containing layers), but is not limited thereto.
  • the other resin-containing layer may be a layer containing a metal component or a layer not containing a metal component, but a layer not containing a metal component can also be particularly preferably employed.
  • the content of the resin component in the other resin-containing layer is usually the remainder excluding the above-mentioned additives. Therefore, it can be set to, for example, about 95 to 100% by mass, but is not limited to this.
  • the plastic base material (I) may be composed of only a metal-containing layer, or may be a multilayer structure including another resin-containing layer. That is, the plastic base material in the laminate of the present invention includes (a) one or more metal-containing layers, and (b) one or more metal-containing layers, and one layer. Alternatively, it may be composed of two or more other resin-containing layers.
  • the thickness composition ratio of the metal-containing layer (M) and the other resin-containing layer (R) is not particularly limited, and is determined by the total thickness (Mt) of the metal-containing layer (M) and the other resin-containing layer.
  • the ratio [(Rt)/(Mt)] of the total thickness (Rt) of the containing layer (R) is preferably 1/1000 to 1000/1, and since it is easy to control the thickness of each layer, /100 to 100/1 is more preferable, and even more preferably 1/10 to 10/1.
  • the other resin-containing layer (R) may be simply referred to as a "resin layer (R)" below.
  • the thickness of the plastic base material (I) can be appropriately selected depending on the mechanical strength required of the resulting gas barrier laminate. In particular, for reasons of mechanical strength and ease of handling, the thickness of the plastic base material (I) can be set as appropriate within the range of usually about 5 to 99.95 ⁇ m, particularly 5 to 50 ⁇ m. The thickness is preferably 5 to 40 ⁇ m, more preferably 5 to 40 ⁇ m, and most preferably 10 to 30 ⁇ m. When the thickness of the plastic base material (I) is less than 5 ⁇ m, sufficient mechanical strength cannot be obtained, and the puncture strength tends to decrease.
  • Gas barrier layer (II) The gas barrier layer (II) constituting the laminate of the present invention contains polycarboxylic acid.
  • the polycarboxylic acid in the gas barrier layer (II) can exhibit desired gas barrier properties by reacting with the metal component in the plastic base material (I).
  • the polycarboxylic acid may be any compound (including a polymer) having two or more carboxyl groups in the molecule. Further, these carboxyl groups may form an anhydride structure.
  • polycarboxylic acids include 1,2,3,4-butanetetracarboxylic acid, polyacrylic acid, polymethacrylic acid, acrylic acid-methacrylic acid copolymer, acrylic acid-maleic acid copolymer, and polymaleic acid.
  • examples include olefin-maleic acid copolymers such as ethylene-maleic acid copolymers, polysaccharides having carboxyl groups in side chains such as alginic acid, carboxyl group-containing polyamides, and polyesters.
  • the above polycarboxylic acids can be used alone or in combination of two or more.
  • the polycarboxylic acid is a polymer
  • its weight average molecular weight is not limited, but it is usually about 1,000 to 1,000,000, and more preferably 10,000 to 150,000. Among these, the most preferable range is 15,000 to 110,000. If the weight average molecular weight of the polycarboxylic acid is too low, the resulting gas barrier layer (II) will become brittle. On the other hand, if the weight average molecular weight of the polycarboxylic acid is too high, handling properties may be impaired, and in some cases, the polycarboxylic acid may aggregate in the coating solution for forming the gas barrier layer (II) described below, resulting in a gas barrier layer ( II) may result in loss of gas barrier properties.
  • polyacrylic acid acrylic acid-maleic acid copolymer
  • olefin-maleic acid copolymer ethylene-maleic acid copolymer
  • EMA ethylene-maleic acid copolymer
  • EMA can be obtained, for example, by polymerizing maleic anhydride and ethylene using a known method such as solution radical polymerization.
  • the maleic acid unit in the olefin-maleic acid copolymer tends to form a maleic anhydride structure in which adjacent carboxyl groups are dehydrated and cyclized in a dry state, and when wet or in an aqueous solution, the maleic acid unit opens to form a maleic acid structure. Therefore, in the present invention, maleic acid units and maleic anhydride units are collectively referred to as "maleic acid units" unless otherwise specified.
  • the maleic acid unit in EMA is not limited, but it is usually preferably 5 mol% or more, particularly preferably 20 mol% or more, and even more preferably 30 mol% or more. Among these, the most preferred is 35 mol% or more.
  • the upper limit of the maleic acid unit is not particularly limited, but is usually 90 mol% or less, and preferably 80 mol% or less.
  • the weight average molecular weight of EMA is not limited, it is usually preferably about 1,000 to 1,000,000, more preferably 3,000 to 500,000, particularly 7 ,000 to 300,000, and most preferably 10,000 to 200,000.
  • the gas barrier layer (II) may contain 100% by mass of polycarboxylic acid or less (for example, 50 to 80% by mass, or 60 to 75% by mass), but may also contain other components. In the present invention, it is particularly preferable to contain polyalcohol.
  • polyalcohol By containing polyalcohol, the polycarboxylic acid in the gas barrier layer (II) not only reacts with the metal component in the plastic base material (I) but also reacts with the polyalcohol, thereby further enhancing gas barrier properties. I can do it. Therefore, in the gas barrier layer, the polyalcohol can be contained in an amount of, for example, about 20 to 50% by mass, preferably 25 to 40% by mass.
  • the polyalcohol is not limited, and includes, for example, a compound having two or more hydroxyl groups in the molecule. These compounds may be either low-molecular compounds or high-molecular compounds.
  • Examples of the above-mentioned low molecular weight compounds include sugar alcohols such as glycerin and pentaerythritol, monosaccharides such as glucose, disaccharides such as maltose, and oligosaccharides such as galactooligosaccharides. At least one kind of these can be used.
  • polysaccharides such as starch. At least one kind of these can be used.
  • degree of saponification of the polyvinyl alcohol, ethylene-vinyl alcohol copolymer, etc. is, although not limited, preferably 95 mol% or more, particularly preferably 98 mol% or more.
  • the average degree of polymerization of the polyvinyl alcohol, ethylene-vinyl alcohol copolymer, etc. is not particularly limited, but it is usually preferably about 50 to 2,000, particularly preferably 200 to 1,000. preferable.
  • these polyalcohols can be used alone or in combination of two or more.
  • polyvinyl alcohol can be particularly preferably used.
  • the ratio of polycarboxylic acid to polyalcohol in the gas barrier layer (II) is not limited as long as the desired effect can be obtained, but the molar ratio of OH groups to COOH groups (OH group/COOH group) is usually 0.01 to 0.01. It is preferably 20, more preferably 0.01 to 10, particularly preferably 0.02 to 5, and most preferably 0.04 to 2.
  • the gas barrier layer (II) can contain polyacrylamide, polymethacrylamide, or polyamine. By containing these compounds, the polycarboxylic acid in the gas barrier layer (II) not only reacts with the metal component in the plastic base material (I) but also reacts with these compounds, improving gas barrier properties. can be improved.
  • polyacrylamide polymethacrylamide, or polyamine
  • polyamine known or commercially available ones can be used.
  • polyamines having two or more amino groups of at least one type selected from primary and secondary amino groups in the molecule can be used.
  • Specific examples include polysaccharides that have amino groups in their side chains such as polyallylamine, polyvinylamine, branched polyethyleneimine, linear polyethyleneimine, polylysine, and chitosan, and polysaccharides that have amino groups in their side chains such as polyarginine.
  • polyamides The weight average molecular weight of the polyamine is not particularly limited, but it is usually preferably about 5,000 to 150,000.
  • the resulting gas barrier layer (II) may become brittle.
  • the weight average molecular weight of the polyamine is too high, handling properties may be impaired, and in some cases, it may aggregate in the coating solution for forming the gas barrier layer (II) described below, resulting in a gas barrier layer ( II) may impair gas barrier properties.
  • the mass ratio of polyamine to polycarboxylic acid (polyamine/polycarboxylic acid) in the gas barrier layer (II) is not particularly limited, but is usually about 12.5/87.5 to 27.5/72.5. It is preferable. If the content of polyamine is too low, crosslinking of the carboxyl groups of the polycarboxylic acid may become insufficient. If the content of polyamine is too high, crosslinking of the amino groups of the polyamine may become insufficient. Therefore, in either case, the resulting gas barrier laminate may have poor gas barrier properties.
  • the gas barrier layer (II) may contain a crosslinking agent. By containing a crosslinking agent, gas barrier properties can be further improved.
  • the content of the crosslinking agent in the gas barrier layer (II) is preferably 0.1 to 30 parts by weight, more preferably 1 to 20 parts by weight, based on 100 parts by weight of the polycarboxylic acid.
  • the crosslinking agent include a) a compound having self-crosslinking properties, and b) a compound having a plurality of functional groups in the molecule that react with a carboxyl group.
  • the gas barrier layer (II) contains polyalcohol, it may be a compound having a plurality of functional groups that react with hydroxyl groups in the molecule.
  • Preferred crosslinking agents include at least one of isocyanate compounds, melamine compounds, urea compounds, epoxy compounds, carbodiimide compounds, zirconium salt compounds such as zirconium ammonium carbonate, and metal alkoxides.
  • a metal alkoxide is a compound containing a metal to which an alkoxy group is bonded, and in place of some of the alkoxy groups, an alkyl group substituted with a functional group having reactivity with a halogen or a carboxyl group may be bonded.
  • examples of the metal in the metal alkoxide include at least one type of atoms such as Si, Al, Ti, and Zr. Note that the metal in the present invention also includes semimetals such as Si.
  • Examples of the halogen include at least one of chlorine, iodine, and bromine.
  • Examples of the functional group having reactivity with the carboxyl group include at least one of an epoxy group, an amino group, an isocyanate group, and a ureido group.
  • examples of the alkyl group include at least one of a methyl group, an ethyl group, an n-propyl group, an iso-propyl group, an n-butyl group, an iso-butyl group, and the like.
  • metal alkoxides include tetramethoxysilane, tetraethoxysilane, chlorotriethoxysilane, 3-glycidoxypropyltrimethoxysilane, 3-glycidoxypropyltriethoxysilane, and 3-aminopropyltrimethoxysilane.
  • alkoxysilane compounds such as 3-aminopropyltriethoxysilane, 3-ureidopropyltriethoxysilane, and 3-isocyanatepropyltriethoxysilane
  • alkoxytitanium compounds such as tetraisopropoxytitanium and tetraethoxytitanium, triisopropoxyaluminum, etc.
  • alkoxyaluminum compound an alkoxyzirconium compound such as tetraisopropoxyzirconium, and the like.
  • metal alkoxides may be partially or completely hydrolyzed, partially hydrolyzed or condensed, completely hydrolyzed and partially condensed, or a combination of these. You can also do it.
  • any method used in a known sol-gel method can be applied.
  • the gas barrier layer (II) may contain, for example, a heat stabilizer, an antioxidant, a reinforcing material, a pigment, an anti-deterioration agent, a weathering agent, and a hardening agent, as long as they do not significantly impair gas barrier properties and adhesion to the plastic substrate (I).
  • Additives such as a repellent, a plasticizer, a mold release agent, a lubricant, a preservative, a wetting agent, a viscosity modifier, and an antifoaming agent may be included.
  • the heat stabilizer, antioxidant, or deterioration inhibitor include hindered phenols, phosphorus compounds, hindered amines, sulfur compounds, copper compounds, and alkali metal halides. These can be used alone or in combination of two or more.
  • reinforcing materials include clay, talc, wollastonite, silica, alumina, calcium silicate, sodium aluminate, sodium aluminosilicate, magnesium silicate, glass balloon, carbon black, zeolite, montmorillonite, hydrotalcite, fluorinated mica. , metal fibers, metal whiskers, ceramic whiskers, potassium titanate whiskers, boron nitride, graphite, glass fibers, carbon fibers, fullerenes (C60, C70, etc.), carbon nanotubes, and the like.
  • the total content of these additives is usually about 5% by mass or less in the metal-containing layer, but is not limited thereto.
  • its content in the gas barrier layer (II) is approximately 0.01 to 1.00% by mass, preferably 0.10 to 0.50% by mass. .
  • the thickness of the gas barrier layer (II) laminated on the plastic base material (I) is not limited, but from the viewpoint of sufficiently increasing the gas barrier properties of the gas barrier laminate, the thickness is preferably 0.05 ⁇ m or more. It is preferably thick, particularly preferably 0.10 ⁇ m or more, and most preferably 0.15 ⁇ m or more. Further, from the economic point of view, it is preferably thinner than 5.00 ⁇ m, particularly preferably 1.00 ⁇ m or less, and most preferably 0.50 ⁇ m or less. Therefore, the thickness can be set, for example, in the range of 0.06 to 4.50 ⁇ m, or, for example, in the range of 0.20 to 0.40 ⁇ m.
  • the basic structure of the laminate of the present invention includes a plastic base material (I) containing a metal-containing layer and a gas barrier layer (II). ) and the gas barrier layer (II) may each be composed of one layer or two or more layers as described above, as long as they are in contact with each other.
  • examples of the structure of the laminate of the present invention include "(R)/(M)/(II)", “(M)/( R)/(M)/(II)", “(II)/(M)/(R)/(II)”, “(II)/(M)/(R)/(M)/(II) ” etc.
  • the gas barrier layer (II) and the metal-containing layer (M) are in contact with each other, and the polycarboxylic acid in the gas barrier layer (II) and the metal component in the metal-containing layer (M) tend to react. Gas barrier properties can be efficiently obtained.
  • the configuration of "(R)/(M)/(II)” is preferable in consideration of manufacturing equipment, operability, etc.
  • the laminate of the present invention has an oxygen permeability of 300 ml/( m2 ⁇ day ⁇ MPa) measured at a temperature of 40°C and a humidity of 90% RH after subjecting the laminate to hot water treatment at a temperature of 95°C for 30 minutes. ) can exhibit the following characteristics. Thereby, the laminate of the present invention can exhibit excellent gas barrier properties.
  • the laminate after the above hot water treatment has (a) a temperature of 20°C and a humidity of 65% RH, (b) a temperature of 20°C and a humidity of 90% RH, (c) a temperature of 30°C and a humidity of 80% RH, and (d)
  • the oxygen permeability measured at a temperature of 40° C. and a humidity of 90% RH is preferably 300 ml/(m 2 ⁇ day ⁇ MPa) or less.
  • the oxygen permeability after hot water treatment should be particularly 200 ml/( m2 ⁇ day ⁇ MPa) or less under any of the conditions (a) to (d) above.
  • the lower limit of the oxygen permeability in (a) above is preferably closer to 0 ml/(m 2 ⁇ day ⁇ MPa), and can be set to, for example, 1 ml/(m 2 ⁇ day ⁇ MPa), but is not limited thereto.
  • the lower limit of the oxygen permeability in the above (b) is preferably closer to 0 ml/(m 2 ⁇ day ⁇ MPa), and can be set to, for example, 1 ml/(m 2 ⁇ day ⁇ MPa), but is not limited to this.
  • the lower limit of the oxygen permeability in (c) above is preferably closer to 0 ml/(m 2 ⁇ day ⁇ MPa), and can be set to, for example, 1 ml/(m 2 ⁇ day ⁇ MPa), but is not limited thereto.
  • the lower limit of the oxygen permeability in (d) above is preferably closer to 0 ml/(m 2 ⁇ day ⁇ MPa), and can be set to, for example, 20 ml/(m 2 ⁇ day ⁇ MPa), but is not limited thereto.
  • the laminate of the present invention preferably has a tensile strength of 150 MPa or more, particularly preferably 180 MPa or more, in a tensile test measured at a temperature of 23°C and a humidity of 50% RH in accordance with the Japanese Industrial Standard JIS K7127. . If the tensile strength is less than 150 MPa, the mechanical strength will not be sufficient and the puncture strength will tend to decrease. Therefore, it can be set to, for example, about 150 to 300 MPa, but is not limited to this.
  • the tensile elongation in a tensile test measured at a temperature of 23°C and a humidity of 50% RH according to JIS K7127 is preferably 60% or more, more preferably 80% or more, from the same viewpoint as the tensile strength. preferable. Therefore, it can be set to, for example, about 60 to 95%, but is not limited to this.
  • the number of pinholes generated in a bending fatigue test repeated 500 times in a 5° C. atmosphere is 100 or less, and particularly preferably 20 or less.
  • the above pinhole resistance is determined by measuring the number of pinholes after bending 500 times at 5°C using a Gelbo Flex Tester (manufactured by Tester Sangyo Co., Ltd., for example) in accordance with ASTM F392. It was evaluated.
  • the lower limit of the number of pinholes is preferably as close to 0 as possible, and can be set to 0, for example, but is not limited thereto.
  • the haze measured in accordance with Japanese Industrial Standard JIS K7136 at a temperature of 23°C and a humidity of 50% RH is preferably 70% or less, more preferably 50% or less. , more preferably 30% or less, particularly preferably 15% or less, and most preferably 10% or less.
  • transparency may not be required, so this is not the case.
  • the total thickness of the laminate of the present invention needs to be 100 ⁇ m or less, and can be appropriately set within this range depending on the intended use.
  • the total thickness of the laminate is preferably thinner, particularly preferably 50 ⁇ m or less, and most preferably 30 ⁇ m or less.
  • the layer thickness of the laminate is preferably thicker, particularly preferably 5 ⁇ m or more, and more preferably 10 ⁇ m or more. Therefore, the thickness can be set, for example, in the range of 6 to 40 ⁇ m, or, for example, in the range of 12 to 25 ⁇ m.
  • the gas barrier laminate of the present invention can be produced by any method as long as it has the characteristics described above, but in particular the following method: A method of manufacturing a gas barrier laminate, the method comprising: (1) A step of preparing a coating solution for gas barrier layer formation by passing a raw material solution containing polycarboxylic acid through a filter with a filtration accuracy of 1.0 to 10.0 ⁇ m (coating solution preparation step), and (2) A step of applying the coating liquid on at least the surface of the metal-containing layer of the plastic base material (I) including a metal-containing layer containing at least one metal and a metal compound and a resin component (coating liquid application step) It can be suitably manufactured by a manufacturing method characterized by including.
  • Coating liquid preparation step a gas barrier layer forming coating liquid is prepared by passing a raw material liquid containing polycarboxylic acid through a filter with a filtration accuracy of 1.0 to 10.0 ⁇ m.
  • the raw material solution containing polycarboxylic acid is preferably aqueous from the viewpoint of workability. Therefore, the polycarboxylic acid and optional components such as polyalcohol and polyamine are preferably water-soluble or water-dispersible, and particularly preferably water-soluble.
  • polycarboxylic acid As the polycarboxylic acid, the various polycarboxylic acids listed above in "1. Gas barrier laminate" can be used.
  • an aqueous solution or aqueous dispersion of polycarboxylic acid obtained by mixing polycarboxylic acid and water can be used.
  • concentration of polycarboxylic acid in this case is not limited, and can be set, for example, within a range of about 5 to 30% by mass.
  • the type of polyalcohol used, the ratio of polycarboxylic acid to polyalcohol, additives, etc. are as described in "1. Gas barrier laminate" above.
  • the alkali compound it is preferable to add the alkali compound in an amount of 0.1 to 20 equivalent % based on the carboxyl group of the polycarboxylic acid. Since polycarboxylic acid becomes highly hydrophilic when the content of carboxyl groups is high, it can be made into an aqueous solution without adding an alkali compound. In this case, by adding an appropriate amount of an alkali compound, the gas barrier properties of the resulting gas barrier laminate can be significantly improved.
  • the alkali compound may be any one as long as it can neutralize the carboxyl group of polycarboxylic acid, for example, at least one of sodium hydroxide, potassium hydroxide, calcium hydroxide, sodium carbonate, aqueous ammonia, sodium bicarbonate, etc. can be mentioned.
  • the amount of the alkali compound added is usually preferably 0.1 to 20% by mole based on the carboxyl group of the polycarboxylic acid.
  • aqueous coating solution when preparing an aqueous coating solution by mixing a polycarboxylic acid and a polyamine, it is preferable to add a base to the polycarboxylic acid in order to suppress gelation.
  • the base may be any base as long as it does not inhibit the gas barrier properties of the gas barrier laminate obtained, and examples thereof include inorganic compounds such as sodium hydroxide and calcium hydroxide, and organic compounds such as ammonia, methylamine, and diethanolamine. These can be used alone or in combination of two or more. Among these, ammonia is preferred because it easily volatizes during drying and heat treatment.
  • the amount of the base added is usually preferably 0.6 equivalent or more, particularly preferably 0.7 equivalent or more, and especially 0.8 equivalent or more based on the carboxyl group of the polycarboxylic acid. is most preferable. If the amount of base added is small, the coating liquid may gel during coating, making it difficult to form the gas barrier layer (II) on the plastic substrate (I).
  • a raw material liquid can be prepared by mixing these components.
  • mixing can be carried out using a melting pot or the like equipped with a stirrer.
  • the mixing procedure is not limited, it is particularly preferable to separately form aqueous solutions of polycarboxylic acid and polyalcohol and mix them before coating. At this time, if the alkali compound is added to the aqueous solution of polycarboxylic acid, the stability of the aqueous solution can be improved.
  • additives may be included in the raw material liquid within a range that does not impede the effects of the present invention.
  • examples of the additive include the various additives listed above in "1. Gas barrier laminate".
  • an antifoaming agent from the viewpoint of suppressing foaming of the raw material liquid or promoting the breaking of already generated foam.
  • the type of antifoaming agent is not particularly limited, but any of mineral oil type, vegetable oil type, aqueous emulsion type, silicone type, etc. can be used, and can be selected as appropriate depending on the purpose. Known or commercially available ones can also be used. Further, the antifoaming agent may be either solid or liquid.
  • the average particle diameter of the antifoaming agent is not particularly limited, but from the viewpoint of improving the antifoaming effect and suppressing coating removal, it is preferably 0.10 to 5.00 ⁇ m, particularly 0.15 to 3.00 ⁇ m. is more preferable, and among these, 0.20 to 1.00 ⁇ m is most preferable.
  • the average particle size is preferably 0.10 to 5.00 ⁇ m, particularly 0.15 to 3.00 ⁇ m. is more preferable, and among these, 0.20 to 1.00 ⁇ m is most preferable.
  • the average particle size indicates the droplet diameter when the antifoaming agent is a liquid or when used as a liquid.
  • Methods for adjusting the average particle diameter of the antifoaming agent to the above-mentioned preferred range are not particularly limited, and include, for example, rotational stirring with a disper, ultrasonic stirring with a homogenizer, and appropriate filtration by applying pressure with a pump. In addition to methods such as passing through a precision filter, there are methods that combine two or more of these methods.
  • the content of the antifoaming agent is preferably 0.001% by mass to 0.100% by mass, particularly 0.010% to 0.00% by mass, based on the total amount of the raw material liquid containing water, from the viewpoint of improving the defoaming effect or suppressing coating removal. More preferably, the content is .050% by mass.
  • the antifoaming agent content is 0.001% by mass or more, the antifoaming effect is exhibited, and when the content is 0.100% by mass or less, coating removal can be suppressed, and gas barrier properties are improved especially in high temperature and high humidity environments. The decrease can be suppressed.
  • a coating solution for forming a gas barrier layer is prepared by passing the raw material liquid thus obtained through a filter with a filtration accuracy (absolute filtration accuracy) of 1.0 to 10.0 ⁇ m.
  • a filtration accuracy absolute filtration accuracy
  • the cause has not yet been clarified, but according to post hoc speculation, it is thought to be as follows.
  • By passing through a filter not only can air bubbles contained in the raw material liquid be removed or finely divided, but also coarse particles in the raw material liquid can be removed.
  • a film can be formed that is entirely homogeneous and substantially free of defects such as pores and cracks.
  • a filter with a filtration accuracy of 1.0 to 10.0 ⁇ m is used, and a filter with a filtration accuracy of 2.0 to 5.0 ⁇ m is particularly preferred. If a filter with a filtration accuracy of less than 1.0 ⁇ m is used, the antifoaming agent particle size after passing through the filter will become too small when using the antifoaming agent shown below, and a sufficient antifoaming effect will not be obtained. It may cause the coat to come off.
  • the filter in order to improve filtration efficiency and filtration performance, it is preferable to pass the raw material liquid through the filter while pressurizing it.
  • the pressure may normally be in the range of 0.1 to 0.3 MPa, particularly preferably 0.15 to 0.25 MPa. If the pressure is less than 0.1 MPa, the filtration efficiency is low and the effect of the filter on turning the antifoaming agent into fine particles is small. On the other hand, if it is higher than 0.3 MPa, there is a concern that the filter may be destroyed.
  • a normal pressurizing device such as a pump
  • the filter device is not particularly limited as long as the filtration accuracy is within the range of 1.0 to 10.0 ⁇ m, and includes, for example, (a) a filter housing, (b) a filter installed in the filter housing, (c) A filter device including a pump for injecting the raw material liquid into the filter under pressure can be used.
  • any type of filter such as a metal mesh, filter cloth, nonwoven fabric laminate, resin molded body, ceramic molded body, etc. can be suitably used.
  • the shape is not limited either, and for example, a cylindrical (chikuwa-shaped) filter can be used.
  • the size can be about 50 to 100 mm in outer diameter, about 10 to 30 mm in inner diameter, and about 200 to 1000 mm in length, but is not limited thereto.
  • Known or commercially available devices can also be used as these devices.
  • the processing method using a filter may be either a continuous type or a circulation type. Further, the number of times of passing through the filter may be one, or two or more times (multistage type). Therefore, for example, after passing through a first filter whose filtration accuracy is within the range of 1.0 to 10.0 ⁇ m, a filter whose filtration accuracy is within the range of 1.0 to 10.0 ⁇ m and smaller than the first filter is passed. It is also possible to adopt a method of passing the signal through a second filter having high accuracy.
  • the viscosity of the raw material liquid when passing through the filter is not particularly limited, but the viscosity when measured at a liquid temperature of 25°C using a B-type viscometer is about 5.0 to 50.0 mPa ⁇ s. It is preferably within the range. Therefore, it can be set within the range of 10.0 to 40.0 mPa ⁇ s, for example.
  • the liquid viscosity before passing through the filter is within the above range, it is possible to further promote the division of bubbles and to further improve the accuracy of controlling the particle size of the antifoaming agent.
  • the effect of promoting fragmentation of aggregates of polycarboxylic acid and/or polyalcohol can also be expected. Therefore, if the viscosity of the coating liquid before passing through the filter is outside the above range, the viscosity of the coating liquid can be adjusted as necessary.
  • the gas barrier layer is applied on at least the surface of the metal-containing layer of the plastic substrate (I) including the metal-containing layer containing at least one of metals and metal compounds and a resin component. Apply the forming coating liquid.
  • the plastic base material (I) can have the configuration described in "1. Gas barrier laminate" above, and can use, for example, a film preformed from a resin-containing raw material. Furthermore, the method for producing the plastic base material (I) is not particularly limited, and for example, a plastic base material (I) produced as follows can also be used.
  • plastic base material (I) consisting of a single-layer film
  • a thermoplastic resin mixed with a metal component is heated and melted in an extruder and extruded into a film form from a T-die, using an air knife casting method or electrostatic application.
  • the film is cooled and solidified on a rotating cooling drum by a known casting method such as a casting method to obtain an unstretched film. This can be used as the plastic base material (I).
  • the plastic base material (I) consisting of a film with a multilayer structure
  • a thermoplastic resin mixed with a metal component is heated and melted in extruder A, and the thermoplastic resin is heated and melted in extruder B.
  • the two molten resins are superimposed in a die, and a film that can have a two-layer structure of, for example, a metal-containing layer (M)/resin layer (R) is extruded from a T-die, and is cooled and solidified in the same manner as above. It can be obtained as a stretched film.
  • the film thus obtained can be used as the plastic substrate (I).
  • the method of applying the gas barrier layer (II) forming coating liquid to the plastic substrate (I) is not particularly limited, and examples thereof include an air knife coater, a kiss roll coater, a metering bar coater, a gravure roll coater, a reverse roll coater, It is possible to employ a method such as a dip coater, a die coater, etc., or a combination of two or more thereof.
  • a drying step of drying the coating film can be carried out as necessary.
  • the drying method is not particularly limited, and examples include a) a method in which heat treatment is performed immediately after application, and formation of a dry film and heat treatment are performed at the same time; b) after application, moisture is removed by blowing hot air with a dryer, etc., infrared irradiation, etc. Examples include a method in which a dry film is formed by evaporating and then heat treatment is performed.
  • the heat treatment method is not particularly limited, and examples thereof include a method of performing heat treatment in a dry atmosphere such as an oven. In view of shortening the process, it is preferable to stretch the plastic substrate (I) after applying the coating liquid for forming the gas barrier layer (II). In any of the above cases, it is preferable that the plastic substrate (I) on which the gas barrier layer (II) is formed is subjected to heat treatment for 5 minutes or less in a heated atmosphere of 100° C. or higher.
  • the coating liquid may be affected by their ratio, the presence or absence of additive components, the content of additives, etc.
  • the heat treatment temperature after coating cannot be limited, but it is usually preferably about 100 to 300°C, more preferably 120 to 250°C, even more preferably 140 to 240°C, and Among these, a temperature of 160 to 220°C is most preferable. If the heat treatment temperature is less than 100°C, the crosslinking reaction between the polycarboxylic acid and the polyalcohol may not proceed sufficiently, and it may be difficult to obtain a laminate with sufficient gas barrier properties. If the heat treatment temperature exceeds 300°C, there is a risk that the gas barrier layer (II) etc. will become brittle.
  • the heat treatment time is usually preferably 5 minutes or less, more preferably 1 second to 5 minutes, even more preferably 3 seconds to 2 minutes, and among them, 5 seconds to 1 minute. Most preferred. If the heat treatment time is too short, the crosslinking reaction cannot proceed sufficiently, making it difficult to obtain a laminate having gas barrier properties, while if the heat treatment time is too long, productivity will decrease.
  • the coating liquid (coating film) for forming the gas barrier layer (II) applied to the plastic substrate (I) may be exposed to ultraviolet rays, X-rays, electron beams, etc., as necessary, before and/or after the above-mentioned drying.
  • High energy ray irradiation treatment may be performed.
  • a component that is crosslinked or polymerized by high-energy ray irradiation may be included.
  • the stretching step preferably further includes a step of subjecting the laminate coated with the gas barrier layer forming coating liquid to simultaneous biaxial stretching or sequential biaxial stretching.
  • the stretching method may be either simultaneous biaxial stretching or sequential biaxial stretching, but it is particularly preferable to use the simultaneous biaxial stretching method.
  • the simultaneous biaxial stretching method can generally provide practical properties such as mechanical properties, optical properties, thermal dimensional stability, and pinhole resistance.
  • orientation crystallization of the film progresses during longitudinal stretching and the stretchability of the thermoplastic resin during horizontal stretching decreases, resulting in a reduction in the blending of metal components.
  • the frequency of film breakage tends to increase. For this reason, in the present invention, it is preferable to perform water absorption treatment and adopt a simultaneous biaxial stretching method.
  • simultaneous biaxial stretching for example, after coating the plastic substrate (I) with a coating liquid for forming a gas barrier layer (II) to form a gas barrier layer (II), using a tenter type simultaneous biaxial stretching machine, By performing simultaneous biaxial stretching in the machine direction (MD) and transverse direction (TD), a simultaneously biaxially stretched gas barrier laminate can be obtained.
  • MD machine direction
  • TD transverse direction
  • sequential biaxial stretching for example, after stretching the obtained unstretched film in the machine direction (MD), the coating liquid for forming the gas barrier layer (II) is applied by the method described above to form the gas barrier layer (II).
  • TD transverse direction
  • the stretchability may be reduced in a subsequent step, so it is preferable that the unstretched film is substantially amorphous and unoriented.
  • the unstretched film is transferred to a water tank whose temperature is controlled not to exceed 80°C, subjected to water immersion treatment within 5 minutes, and treated with moisture absorption of 0.5 to 15%. It is preferable to do so.
  • the stretching ratio of the film is preferably 1.5 times or more in the case of uniaxial stretching, and preferably 1.5 times or more in each of the longitudinal and lateral directions also in the case of biaxial stretching.
  • the area magnification is usually preferably 3 times or more, particularly preferably 6 to 20 times, and most preferably 6.5 to 13 times. When the stretching ratio is within this range, it becomes possible to obtain a gas barrier laminate with better mechanical properties.
  • the stretching temperature is also not limited, and can be carried out, for example, within the range of 40 to 220°C.
  • the stretching in the MD direction be carried out at 40 to 80°C and the stretching in the TD direction to be carried out at 80 to 150°C.
  • the temperature is preferably 160 to 220°C.
  • the film that has undergone the stretching process can also be subjected to a heat setting process, a relaxing process, etc., if necessary.
  • the temperature in the heat setting step can be set appropriately within the range of usually about 150 to 300°C, and can also be set to 200 to 230°C, for example.
  • the time of the heat setting step can be changed depending on the temperature etc., usually within a range of about 1 to 30 seconds, and can be set to, for example, 1 to 5 seconds, but is not limited thereto.
  • the relaxing step it is sufficient to relax in the longitudinal direction and/or the lateral direction, usually within the range of a relaxation rate of about 0 to 10% (preferably 2 to 6%).
  • the temperature in the relaxation process can be set as appropriate within the range of about 150 to 300°C, similar to the heat setting process, but in order to more reliably reduce the heat shrinkage rate, it should be set higher than the maximum temperature of the heat setting process. It is desirable to perform this at a low temperature. It is preferable that the heat-setting step and the relaxing step are performed in succession, for example, after heat-setting in a tenter in which a stretching treatment has been performed.
  • the gas barrier laminate of the present invention can also be treated in a humidified atmosphere after producing the laminate, especially for the purpose of improving gas barrier properties.
  • the humidification treatment can further promote the interaction between the metal component of the plastic base material (I) and the polycarboxylic acid of the gas barrier layer (II).
  • Such humidification treatment may be performed by leaving the laminate in an atmosphere of high temperature and high humidity, or by directly contacting the laminate with high-temperature water.
  • Humidification treatment conditions vary depending on the purpose, etc., but when left in a high temperature and high humidity atmosphere, a temperature of 30 to 130° C. and a humidity of 50 to 100% RH are preferred. Even when contacting with high temperature water, the temperature is preferably about 30 to 130°C (at 100°C or higher, under pressure).
  • the humidification treatment time varies depending on the treatment conditions, etc., but can generally be set appropriately in the range of several seconds to several hundred hours.
  • the gas barrier laminate of the present invention may be subjected to surface treatment such as corona discharge treatment, if necessary. These processing methods themselves can be carried out according to known methods.
  • the laminate of the present invention can be used as it is, or may be further laminated with other layers as long as the effects of the present invention are not impaired.
  • Other layers are not particularly limited, and include, for example, a base material layer of polyester, polyamide, etc., a sealant layer, a barrier layer, an antistatic layer, a release layer, a printed layer, and the like. These can be used alone or in combination of two or more.
  • the resin used as the sealant layer examples include low density polyethylene, medium density polyethylene, high density polyethylene, linear low density polyethylene, polypropylene, polyethylene/polypropylene copolymer, ethylene-vinyl acetate copolymer, ionomer resin, ethylene-acrylic.
  • examples include at least one of acid/methacrylic acid copolymers, ethylene-acrylic acid/methacrylic acid ester copolymers, and polyvinyl acetate resins.
  • at least one type of polyolefin resin such as polyethylene, polypropylene, polyethylene/polypropylene copolymer, etc., which has high heat seal strength or high strength of the material itself, is preferred.
  • Methods for forming the sealant layer on the gas barrier laminate are not limited, and include, for example, a method of laminating a film or sheet made of a sealant resin onto the gas barrier laminate via an adhesive, a method of forming the sealant resin on the gas barrier laminate, Examples include a method of extrusion lamination into a laminate.
  • the film or sheet made of the sealant resin may be in an unstretched state or in a stretched state at a low magnification, but for practical purposes, it is preferably in an unstretched state.
  • the thickness of the sealant layer is not particularly limited, and can be set appropriately within the range of usually about 20 to 95 ⁇ m, but it is particularly preferably 40 to 70 ⁇ m.
  • barrier layers employed in known films can be used.
  • a polyvinylidene chloride copolymer layer or the like can be used as the barrier layer.
  • the laminate of the present invention can be used in various applications that take advantage of its characteristics, but is particularly suitable for packaging that is subjected to heat sterilization treatment using hot water or steam, such as boiling treatment, retort treatment, etc. for food packaging. It can be suitably used as a material.
  • the laminate of the present invention can be more preferably used as a packaging bag, and further preferably used as a packaging bag for sealing the contents inside the packaging bag.
  • Such packaging bags are suitable for, for example, food and beverages, fruits, juices, drinking water, alcohol, cooked foods, seafood paste products, frozen foods, meat products, boiled foods, bamboo shoots, corn, pickles, pickles, rice cakes, and liquid soups. It is possible to fill and package various liquid and/or solid contents such as various foods and beverages such as soups, seasonings, etc., liquid detergents, cosmetics, and chemical products.
  • a packaging bag When used as a packaging bag, its form is not limited, and examples include two-sided bags, three-sided bags, three-sided zippered bags, gassho bags, gusset bags, bottom gusset bags, stand bags, stand zipper bags, two-sided bags, and four-sided pillar bags. It can be applied to flat bottom gusset bags, side seal bags, bottom seal bags, etc.
  • the laminate of the present invention can be used not only as a packaging material for packaging contents such as foods as described above, but also as a lid material for cup containers (cup products) such as jelly, pudding, etc., squeeze packaging, etc. can also be suitably used.
  • the raw materials used in the examples and comparative examples are as follows.
  • Plastic base material (I) Thermoplastic resin for composition - PA6: Nylon 6 resin (manufactured by Unitika A1030BRF, relative viscosity 3.0)
  • PET Polyethylene terephthalate resin (UT-CBR manufactured by Unitika, intrinsic viscosity 0.62)
  • Metal or metal compound for plastic base material (I) composition MgO: Magnesium oxide (manufactured by Tateho Chemical Industry Co., Ltd.
  • MgO-2 Magnesium oxide (TATEHO MAG #H-10, average particle size 4.9 ⁇ m, manufactured by Tateho Chemical Industry Co., Ltd.)
  • MgCO 3 Magnesium carbonate (manufactured by Kamishima Chemical Industry Co., Ltd.
  • MSS average particle size 1.2 ⁇ m) ⁇ CaCO 3 Calcium carbonate (Vigot15, manufactured by Shiraishi Kogyo Co., Ltd., average particle size 0.5 ⁇ m) ⁇ ZnO: Zinc oxide (FINEX-50, manufactured by Sakai Chemical Industry Co., Ltd., average particle size 0.02 ⁇ m) (3) Polycarboxylic acid component/EMA aqueous solution of coating liquid for forming gas barrier layer (II): EMA (weight average molecular weight 60,000) and sodium hydroxide were added to water, dissolved by heating, and then cooled to room temperature to prepare a solid product in which 10 mol% of the carboxyl groups of EMA were neutralized with sodium hydroxide.
  • EMA weight average molecular weight 60,000
  • aqueous EMA solution 15% by weight aqueous EMA solution.
  • ⁇ PAA aqueous solution Prepared using polyacrylic acid (A10H manufactured by Toagosei Co., Ltd., number average molecular weight 200,000, solid content 25% by mass aqueous solution) and sodium hydroxide, 10 mol% of the carboxyl groups of polyacrylic acid was sodium hydroxide.
  • PAA polyacrylic acid
  • ALDRICH weight average molecular weight 3,000, solid content 50% by mass
  • Other resin components of coating liquid for gas barrier layer (II) formation/PVA aqueous solution Polyvinyl alcohol with a solid content of 15% by mass, prepared by adding poly
  • ⁇ EVOH aqueous solution An ethylene-vinyl alcohol copolymer (EVOH) aqueous solution with a solid content of 10% by mass in which an ethylene-vinyl alcohol copolymer (Exeval AQ-4105 manufactured by Kuraray Co., Ltd.) is dissolved.
  • ⁇ Starch Soluble starch (manufactured by Wako Pure Chemical Industries, Ltd.)
  • PAM Polyacrylamide (manufactured by Kishida Chemical Co., Ltd., reagent, weight average molecular weight 9 million to 10 million, degree of polymerization 127,000 to 141,000).
  • Antifoaming agent The following antifoaming agent was used in the coating solution for forming the gas barrier layer (II).
  • ⁇ Mineral oil-based antifoaming agent 1 AGITAN282 manufactured by MUNZING CHEMIE GmbH
  • ⁇ Mineral oil defoaming agent 2 SN Deformer 154S manufactured by Sannopco ⁇ Polyether antifoaming agent: SN Deformer 180 manufactured by Sannopco ⁇ Acetylene glycol antifoaming agent: Olfine AF-103 manufactured by Nissin Chemical Industries, Ltd.
  • ⁇ Vegetable oil-based antifoaming agent AGITAN271 manufactured by MUNZING CHEMIE GmbH
  • Aqueous emulsion defoaming agent AGITAN170 manufactured by MUNZING CHEMIE GmbH
  • ⁇ Silicone antifoaming agent 1 95 ANTIFOAM EMULSION manufactured by Dow Corning Toray Co., Ltd.
  • ⁇ Silicone antifoaming agent 2 AK350 manufactured by Asahi Kasei Wacker Silicone Co., Ltd.
  • Example 1 PA6 and MgO were mixed so that the MgO content was 0.5% by mass. This mixture was put into an extruder and melted in a cylinder at 270°C. The melt was extruded into a sheet form through a T-die orifice, brought into close contact with a rotating drum cooled to 10° C., and rapidly cooled to obtain an unstretched plastic substrate (I) film with a thickness of 150 ⁇ m. The obtained unstretched film was sent to a 50° C. hot water bath and subjected to water immersion treatment for 2 minutes. This plastic substrate (I) film is composed of a single layer of metal-containing layer (M).
  • M metal-containing layer
  • a raw material liquid was prepared by adding 0.020% by mass of agent 1).
  • the viscosity of this raw material liquid was 15 mPa ⁇ s as measured by a B-type viscometer at a liquid temperature of 25°C.
  • this raw material liquid was passed through a cartridge filter with a filtration accuracy of 1.0 ⁇ m while applying a pressure of 0.10 MPa with a pump to obtain a coating liquid for forming a gas barrier layer (II) having a solid content of 10% by mass.
  • the resulting coating solution was applied to one side of an unstretched film that had been subjected to water immersion treatment, and then dried.
  • the ends of this unstretched film were held in clips of a tenter-type simultaneous biaxial stretching machine, and stretched to 3.3 times in the MD and TD at 180°C. Thereafter, it was heat-set at 210° C. for 4 seconds, then heat-relaxed by 5% in the TD direction, and slowly cooled to room temperature.
  • the gas barrier layer (II) with a thickness of 0.3 ⁇ m was laminated on the plastic substrate (I) with a thickness of 15 ⁇ m (that is, the single layer of the metal-containing layer (M)) (M)/( A gas barrier laminate (total thickness: 15.3 ⁇ m) having the configuration II) was obtained.
  • Examples 2-7, 10-26, 31-35, Comparative Examples 1-7, 9 The composition of the base material layer, the type and mass ratio of polyalcohol and polycarboxylic acid, the metal component content, the main component of the antifoaming agent in the coating liquid, the filtration accuracy and pump pressure of the filter are shown in Tables 1 to 3.
  • a gas barrier laminate having the (M)/(II) configuration was obtained in the same manner as in Example 1, except for the following changes.
  • the liquid viscosity of the raw material liquid before passing through the filter was 15 mPa ⁇ s as measured by a B-type viscometer at a liquid temperature of 25°C.
  • M metal-containing layer
  • R refin layer
  • the obtained unstretched multilayer film was sent to a 50° C. hot water tank and subjected to a water immersion treatment for 2 minutes.
  • a coating solution prepared in the same manner as in Example 1 was applied to the metal-containing layer of the unstretched multilayer film, except that the pump pressure, filter filtration accuracy, and mass ratio of PVA and EMA were changed as shown in Table 1.
  • the liquid viscosity of the raw material liquid before passing through the filter was 35 mPa ⁇ s as measured by a B-type viscometer at a liquid temperature of 25°C.
  • Example 9 PET and MgO were mixed so that the MgO content was 0.5% by mass. This mixture was put into an extruder and melted in a cylinder at 280°C. The melt was extruded into a sheet form through a T-die orifice, brought into close contact with a rotating drum cooled to 20° C., and rapidly cooled to obtain an unstretched plastic substrate (I) film with a thickness of 150 ⁇ m. Next, a coating solution prepared in the same manner as in Example 1 except that the pump pressure and filter filtration accuracy were changed as shown in Table 1 was applied to one side of the unstretched film, and then dried.
  • the liquid viscosity of the raw material liquid before passing through the filter was 15 mPa ⁇ s as measured by a B-type viscometer at a liquid temperature of 25°C.
  • the ends of the film were held in clips of a tenter-type simultaneous biaxial stretching machine, and stretched to 3.3 times in the MD and TD at 100°C. Thereafter, a heat setting process was performed at 220°C for 4 seconds, followed by a 5% heat relaxation process in the TD direction, and slowly cooled to room temperature.
  • a gas barrier laminate having a (M)/(II) configuration in which a 3 ⁇ m gas barrier layer (II) was laminated was obtained.
  • Example 27 After melt-extruding into a sheet through a T-die and rapidly cooling and solidifying it with a cooling drum to obtain an unstretched sheet, the sheet was MD-stretched to 3.3 times using a roll stretching machine at 60°C without water immersion treatment. A coating solution prepared in the same manner as in Example 1, except that the pressure and filter filtration accuracy were changed as shown in Table 2, was applied to one side of the MD stretched film and dried. The liquid viscosity of the raw material liquid before passing through the filter was 15 mPa ⁇ s as measured by a B-type viscometer at a liquid temperature of 25°C.
  • Example 2 the same method as in Example 1 was carried out, except that TD stretching was carried out to 3.3 times at 100 °C using a tenter type stretching machine, heat setting treatment was performed at 205 °C, and then 5% heat relaxation treatment was carried out. A gas barrier laminate having the (M)/(II) configuration was obtained.
  • Example 28 Comparative Example 10 On the unstretched film that has been coated with a gas barrier layer (II) forming coating liquid and dried, apply the same coating liquid to the opposite side to which the gas barrier layer (II) forming coating liquid was applied. (II )/(M)/(II) A gas barrier laminate having the configuration was obtained. The liquid viscosity of the raw material liquid before passing through the filter was 15 mPa ⁇ s as measured by a B-type viscometer at a liquid temperature of 25°C.
  • Example 29 Comparative Example 11
  • a coating liquid consisting of (“Saran Latex L536B" manufactured by Asahi Kasei Co., Ltd., solid content concentration 49% by mass) was applied, dried, and a PVDC layer with a thickness of 1.5 ⁇ m was laminated, pump pressure, and filter filtration accuracy.
  • a gas barrier laminate having a PVDC/(M)/(II) configuration was obtained in the same manner as in Example 1 except for the changes shown in Tables 2 to 3.
  • the liquid viscosity of the raw material liquid before passing through the filter was 15 mPa ⁇ s as measured by a B-type viscometer at a liquid temperature of 25°C.
  • Example 30 A gas barrier laminate having the (M)/(II) configuration was prepared in the same manner as in Example 1, except that no antifoaming agent was added and the filter filtration accuracy and pump pressure were changed as shown in Table 2. I got it.
  • the liquid viscosity of the raw material liquid before passing through the filter was 15 mPa ⁇ s as measured by a B-type viscometer at a liquid temperature of 25°C.
  • Comparative example 8 The gas barrier property of the (M)/(II) configuration was prepared in the same manner as in Example 1, except that the mass ratio of PVA and EMA in the coating liquid, the filtration accuracy of the filter, and the pump pressure were changed as shown in Table 3. A laminate was obtained. The liquid viscosity of the raw material liquid before passing through the filter was 95 mPa ⁇ s as measured by a B-type viscometer at a liquid temperature of 25°C.
  • Comparative examples 14 to 16 Except that no antifoaming agent was added, no filter filtration was performed, and the content of metal components, the thickness of the metal-containing layer (M), and the thickness of the gas barrier layer (II) were changed as shown in Table 3.
  • a gas barrier laminate having the (M)/(II) configuration was obtained in the same manner as in Example 1.
  • the liquid viscosity of the raw material liquid was 15 mPa ⁇ s as measured by a B-type viscometer at a liquid temperature of 25°C.
  • Comparative examples 17-18 A gas barrier laminate having the (M)/(II) configuration was obtained in the same manner as in Example 1, except that no filter filtration was performed and the content of metal components was changed as shown in Table 3. Ta.
  • the liquid viscosity of the raw material liquid was 15 mPa ⁇ s as measured by a B-type viscometer at a liquid temperature of 25°C.
  • Comparative Examples 19-21 The same procedure as in Example 1 was carried out, except that no filter filtration was performed, and the content of metal components, the thickness of the metal-containing layer (M), and the thickness of the gas barrier layer (II) were changed as shown in Table 3.
  • a gas barrier laminate having the (M)/(II) configuration was obtained by the method.
  • the liquid viscosity of the raw material liquid was 15 mPa ⁇ s as measured by a B-type viscometer at a liquid temperature of 25°C.
  • Comparative example 25 Example 8 except that the structure of the base layer, the metal component content, and the mass ratio of PVA and EMA were changed as shown in Table 3, and that no antifoaming agent was added and no filter filtration was performed.
  • a gas barrier laminate having the (R)/(M)/(II) configuration was obtained in the same manner.
  • the liquid viscosity of the raw material liquid was 15 mPa ⁇ s as measured by a B-type viscometer at a liquid temperature of 25°C.
  • Test example 1 The following characteristics of the gas barrier laminates obtained in each of the Examples and Comparative Examples were evaluated. The results are shown in Tables 4 to 6.
  • Average particle size of metal or metal compound The cumulative percentage value of 50% in the particle size distribution (volume distribution) curve measured with a laser particle size analyzer "Microtrac HRA" (manufactured by Nikkiso Co., Ltd.) was determined. A sample for measuring the average particle size was prepared by adding 50 g of isopropyl alcohol (IPA) to 0.5 g of the metal or metal compound and performing ultrasonic dispersion treatment for 3 minutes.
  • IPA isopropyl alcohol
  • the particle size of the antifoaming agent was measured using a coating liquid for forming a gas barrier layer (II) immediately before being applied to an unstretched film that had been subjected to water immersion treatment, and using a laser manufactured by Shimadzu Corporation. It was measured using a diffraction particle size distribution analyzer (SALD-2300), and the median diameter (D50) was defined as the average particle diameter.
  • SALD-2300 diffraction particle size distribution analyzer
  • the obtained gas barrier laminate was left in an environment with a temperature of 23°C and a humidity of 50% RH for 2 hours or more before treatment with hot water, and then the oxygen permeability measuring device manufactured by Mocon Co., Ltd. (OX -TRAN 2/22L) was used to measure the oxygen permeability in an environment with a temperature of 40° C. and a humidity of 90% RH.
  • the obtained gas barrier laminate was treated with hot water at a temperature of 95°C for 30 minutes, and then left in an environment of a temperature of 23°C and a humidity of 50% RH for more than 2 hours.
  • Liquid viscosity was measured using a BROOKFIELD Viscometer DV2T (digital rotational viscometer (B-type viscometer)) using the raw material liquid of the coating liquid for gas barrier layer (II) formation immediately before filtering as a measurement sample.
  • the liquid viscosity at a temperature of 25°C was measured.
  • a model circulation constant temperature bath equipped with an MPC controller manufactured by HUBER Co., Ltd. was used to control the liquid temperature.
  • gas barrier laminates of Examples 1 to 35 all have excellent gas barrier properties in high temperature and high humidity environments by being treated with hot water.
  • the gas barrier layer was formed using a gas barrier layer forming coating solution that was not subjected to the filter filtration process, so the gas barrier layer was formed in a high temperature and high humidity environment. Gas barrier properties were not developed at the bottom.
  • the total thickness of the laminates exceeds 100 ⁇ m, but the oxygen permeability at a temperature of 40°C and a humidity of 90% RH is 549 and 328 ml/( m2 ⁇ day ⁇ MPa), respectively. ).
  • the desired gas barrier properties cannot be obtained even if the total thickness exceeds 100 ⁇ m. I understand that.
  • gas barrier laminates described in Comparative Examples 3 to 7 have a filtration accuracy of 1.0 to 10.0 ⁇ m, which is outside the range of 1.0 to 10.0 ⁇ m. Desired gas barrier properties were not exhibited in a high humidity environment.
  • Comparative Example 9 could not be stretched because the content of the metal compound in the plastic base material (I) was outside the range defined by the present invention.
  • Comparative Examples 22 to 25 are laminates corresponding to Patent Document 2. Although these have good gas barrier properties at 20°C x 65% RH, their oxygen permeability exceeds 500ml/( m2 ⁇ day ⁇ MPa) at 40°C x 95%RH, which is a high temperature and high humidity environment. It can be seen that the desired gas barrier properties cannot be obtained.
  • Example 1 Example 4, Comparative Example 15, Comparative Example 25
  • the test results at 40°C x 95% RH are different.
  • the oxygen permeability has increased in both cases.
  • Comparative Examples 15 and 25 the degree of increase from 30°C x 80% RH to 40°C x 95% RH is 100 times or more compared to the degree of increase from 20°C x 65% RH to 30°C x 80% RH. It can be seen that the conditions of 40° C. and 95% RH are quite severe.

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  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Wood Science & Technology (AREA)
  • Laminated Bodies (AREA)
  • Wrappers (AREA)
  • Shaping By String And By Release Of Stress In Plastics And The Like (AREA)
PCT/JP2023/012060 2022-03-29 2023-03-25 ガスバリア性積層体及びその製造方法 Ceased WO2023190269A1 (ja)

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JP2023547501A JP7357422B1 (ja) 2022-03-29 2023-03-25 ガスバリア性積層体及びその製造方法
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WO2025070584A1 (ja) * 2023-09-27 2025-04-03 ユニチカ株式会社 ガスバリア性積層体及びその製造方法
EP4618266A4 (en) * 2022-12-19 2026-03-04 Lg Energy Solution Ltd SOFT BAG FILM LAMINATE AND SECONDARY BATTERY

Citations (3)

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Publication number Priority date Publication date Assignee Title
WO2014042133A1 (ja) * 2012-09-11 2014-03-20 ユニチカ株式会社 ガスバリア性積層体
JP2017185652A (ja) * 2016-04-04 2017-10-12 ユニチカ株式会社 ガスバリア性積層体
JP2018058280A (ja) * 2016-10-06 2018-04-12 東洋製罐グループホールディングス株式会社 ガスバリア性積層体及びその製造方法

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JP4940739B2 (ja) 2006-04-12 2012-05-30 凸版印刷株式会社 延伸成形用シート、その製造方法ならびにガスバリア性延伸成形体
JP7105472B2 (ja) 2018-03-04 2022-07-25 ユニチカ株式会社 ガスバリア性積層体

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Publication number Priority date Publication date Assignee Title
WO2014042133A1 (ja) * 2012-09-11 2014-03-20 ユニチカ株式会社 ガスバリア性積層体
JP2017185652A (ja) * 2016-04-04 2017-10-12 ユニチカ株式会社 ガスバリア性積層体
JP2018058280A (ja) * 2016-10-06 2018-04-12 東洋製罐グループホールディングス株式会社 ガスバリア性積層体及びその製造方法

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP4618266A4 (en) * 2022-12-19 2026-03-04 Lg Energy Solution Ltd SOFT BAG FILM LAMINATE AND SECONDARY BATTERY
WO2025070584A1 (ja) * 2023-09-27 2025-04-03 ユニチカ株式会社 ガスバリア性積層体及びその製造方法

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