Classifications

• • 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
  • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
  • B32B7/02—Physical, chemical or physicochemical properties
• • 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
  • B29C55/28—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of blown tubular films, e.g. by inflation
• • 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
  • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
  • B29C48/001—Combinations of extrusion moulding with other shaping operations
  • B29C48/0018—Combinations of extrusion moulding with other shaping operations combined with shaping by orienting, stretching or shrinking, e.g. film blowing
• • 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
  • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
  • B29C48/001—Combinations of extrusion moulding with other shaping operations
  • B29C48/0019—Combinations of extrusion moulding with other shaping operations combined with shaping by flattening, folding or bending
• • 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
  • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
  • B29C48/001—Combinations of extrusion moulding with other shaping operations
  • B29C48/0022—Combinations of extrusion moulding with other shaping operations combined with cutting
• • 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
  • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
  • B29C48/022—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the choice of material
• • 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
  • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
  • B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
  • B29C48/09—Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels
  • B29C48/10—Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels flexible, e.g. blown foils
• • 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
  • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
  • B29C48/16—Articles comprising two or more components, e.g. co-extruded layers
  • B29C48/18—Articles comprising two or more components, e.g. co-extruded layers the components being layers
  • B29C48/21—Articles comprising two or more components, e.g. co-extruded layers the components being layers the layers being joined at their surfaces
• • 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
  • B29C55/023—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets using multilayered plates or sheets
• • 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
  • B29C55/04—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets uniaxial, e.g. oblique
  • B29C55/06—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets uniaxial, e.g. oblique parallel with the direction of feed
• • 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
  • B32B1/00—Layered products having a non-planar shape
  • B32B1/08—Tubular products
• • 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
  • B32B27/30—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers
  • B32B27/306—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers comprising vinyl acetate or vinyl alcohol (co)polymers
• • 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
  • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
  • B32B7/04—Interconnection of layers
  • B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
  • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
  • B65D65/00—Wrappers or flexible covers; Packaging materials of special type or form
  • B65D65/38—Packaging materials of special type or form
  • B65D65/40—Applications of laminates for particular packaging purposes
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
  • B29K2023/00—Use of polyalkenes or derivatives thereof as moulding material
  • B29K2023/04—Polymers of ethylene
  • B29K2023/06—PE, i.e. polyethylene
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
  • B29K2023/00—Use of polyalkenes or derivatives thereof as moulding material
  • B29K2023/04—Polymers of ethylene
  • B29K2023/08—Copolymers of ethylene
  • B29K2023/086—EVOH, i.e. ethylene vinyl alcohol copolymer
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
  • B29K2995/00—Properties of moulding materials, reinforcements, fillers, preformed parts or moulds
  • B29K2995/0037—Other properties
  • B29K2995/0065—Permeability to gases
  • B29K2995/0067—Permeability to gases non-permeable
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
  • B29L2031/00—Other particular articles
  • B29L2031/712—Containers; Packaging elements or accessories, Packages
• • 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
  • B32B2250/00—Layers arrangement
  • B32B2250/24—All layers being polymeric
• • 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
  • B32B2255/00—Coating on the layer surface
  • B32B2255/10—Coating on the layer surface on synthetic resin layer or on natural or synthetic rubber layer
• • 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
  • B32B2255/00—Coating on the layer surface
  • B32B2255/20—Inorganic coating
• • 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
  • B32B2255/00—Coating on the layer surface
  • B32B2255/20—Inorganic coating
  • B32B2255/205—Metallic coating
• • 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
  • B32B2255/00—Coating on the layer surface
  • B32B2255/26—Polymeric coating
• • 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
  • B32B2307/516—Oriented mono-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
  • B32B2307/70—Other properties
  • B32B2307/732—Dimensional properties
• • 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
  • B32B2553/00—Packaging equipment or accessories not otherwise provided for
• • 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
  • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
  • Y02W30/00—Technologies for solid waste management
  • Y02W30/50—Reuse, recycling or recovery technologies
  • Y02W30/80—Packaging reuse or recycling, e.g. of multilayer packaging

Definitions

• a resin composition layer containing an ethylene-vinyl alcohol copolymer is provided on the outermost layer, and a multilayer film stretched at least in the uniaxial direction, a method for producing the same, a vapor-deposited multilayer film using the multilayer film, and the multilayer film.
• the present invention relates to a multilayer structure using the vapor-deposited multilayer film and a packaging material having the multilayer structure.
• Ethylene-vinyl alcohol copolymer (hereinafter, may be abbreviated as "EVOH”) is excellent in transparency, gas barrier property, fragrance retention, solvent resistance, oil resistance, etc. It is used in a wide range of applications such as food packaging, pharmaceutical packaging, industrial chemical packaging, agricultural chemical packaging, and industrial films, agricultural films, floor heating pipes, and fuel containers.
• recycling post-consumer recycling
• packaging materials consumed in the market are collected and recycled due to environmental problems and waste problems.
• the number is increasing worldwide, and packaging materials with excellent recyclability are desired.
• Patent Document 1 describes that by providing an EVOH layer having a specific thickness on the outermost surface layer of a laminate, the heat sealing rate when used as a packaging film can be increased without impairing recyclability. There is. Further, it is described that by stretching the laminated body in the uniaxial direction, the transparency and the gas barrier property are excellent.
• the laminate described in Patent Document 1 is produced by inflation molding, if the EVOH layer is the outermost layer on the outer surface side, EVOH tends to adhere to the outer surface of the molten resin discharge port (die lip). (Deposition on the outer surface of the die lip.
• the components of the deposit include a polymerization catalyst residue, a low molecular weight polymer, a thermally decomposed deteriorated resin component, an antioxidant, an ultraviolet absorber, and an antioxidant that may be present in the resin composition.
• the present invention has been made to solve the above problems, and an object of the present invention is to maintain good gas barrier properties in a multilayer film having a layer containing EVOH on the outermost layer, and at the time of stretching after inflation molding. Also includes a multilayer film in which blocking between layers containing EVOH is suppressed, a method for producing the same, a vapor-deposited multilayer film using the multilayer film, the multilayer film or the multilayer structure using the vapor-deposited multilayer film, and the multilayer structure. It provides packaging materials.
• the above object is [1] More than ethylene-vinyl alcohol copolymer (a1) (hereinafter sometimes abbreviated as “EVOH (a1)”) and EVOH (a1) having an ethylene unit content of 20 mol% or more and 60 mol% or less.
• Resin composition (A) layer containing an ethylene-vinyl alcohol copolymer (a2) having a high ethylene unit content hereinafter, may be abbreviated as "EVOH (a2)
• EVOH (a2) ethylene-vinyl alcohol copolymer having a high ethylene unit content
• the resin composition (A) layer is provided on the outermost layer, A multilayer film stretched at least 3 times or more and 12 times or less in the uniaxial direction.
• the multilayer film of [1] further having an adhesive resin (C) layer;
• the mass ratio [a1 / a2] of the content of EVOH (a1) to the content of EVOH (a2) in the resin composition (A) layer is 2/98 or more and 98/2 or less [1].
• the thickness of the resin composition (A) layer is 0.5 to 20 ⁇ m, and the ratio of the thickness of the resin composition (A) layer to the thickness of all the layers of the multilayer film is 30% or less [1].
• Inorganic vapor deposition (D) layer (hereinafter sometimes referred to as "inorganic vapor deposition (D) layer”) on the exposed surface side of the resin composition (A) layer of the multilayer film of [1] to [10].
• thermoplastic resin (E) layer Adjacent to the vapor-deposited multilayer film; [12] A multilayer structure in which the vapor-deposited multilayer film of [11] is further provided with a thermoplastic resin (E) layer. ; [13] A multilayer structure in which the multilayer films of [1] to [10] are further provided with a thermoplastic resin (E) layer; [14] The multilayer structure of [12] or [13] in which both the thermoplastic resin (B) layer and the thermoplastic resin (E) layer are mainly composed of polyethylene resin; [15] A packaging material having a multilayer structure of [12] to [14]; [16] The method for producing a multilayer film according to [1] to [10].
• Manufacturing method including III) Is achieved by providing.
• a multilayer film in which blocking between layers containing EVOH is suppressed even during stretching after inflation molding while maintaining good gas barrier properties is produced.
• a method, a vapor-deposited multilayer film using the multilayer film, a multilayer structure using the multilayer film or the vapor-deposited multilayer film, and a packaging material including the multilayer structure can be provided.
• the performance of "suppressing blocking between layers containing EVOH even during stretching after inflation molding” may be simply expressed as "blocking resistance”.
• the multilayer film of the present invention has a resin composition (A) layer containing EVOH (a1) and EVOH (a2) and a thermoplastic resin (B) layer, and the resin composition (A) layer is provided on the outermost layer. , At least uniaxially stretched 3 times or more and 12 times or less.
• the multilayer film of the present invention tends to have good blocking resistance while maintaining gas barrier properties. Further, since the resin composition (A) layer has a good affinity with the inorganic vapor deposition (D) layer described later, the inorganic vapor deposition (D) layer is adjacent to the exposed surface of the resin composition (A) layer.
• the multilayer film exhibits good gas barrier properties, and tends to maintain gas barrier properties even when subjected to physical stress such as bending. From the viewpoint of producing such a thin-film vapor-deposited multilayer film, it is preferable to provide the resin composition (A) layer on the outermost layer.
• the blocking resistance of the multilayer film of the present invention tends to be excellent.
• a plurality of resin composition (A) layers may be provided, and when a plurality of resin composition (A) layers are provided, "the resin composition (A) layer is provided on the outermost layer” means at least one layer. It means that the resin composition (A) layer of the above is provided on the outermost layer.
• EVOH (a1) and EVOH (a2) can usually be obtained by saponifying an ethylene-vinyl ester copolymer.
• the ethylene-vinyl ester copolymer can be produced and saponified by a known method.
• Vinyl acetate is a typical vinyl ester, but other fatty acid vinyls such as vinyl formate, vinyl propionate, vinyl valerate, vinyl caprate, vinyl laurate, vinyl stearate, vinyl pivalate and vinyl versatic acid. It may be an ester.
• the ethylene unit content of EVOH (a1) is 20 mol% or more, preferably 22 mol% or more, more preferably 25 mol% or more, still more preferably 28 mol% or more.
• the ethylene unit content of EVOH (a1) is 60 mol% or less, preferably less than 40 mol%, more preferably 37 mol% or less, further preferably 34 mol% or less, even if it is 32 mol% or less. good.
• the melt moldability and the gas barrier property under high humidity tend to be good, and when the ethylene unit content is 60 mol% or less, it tends to be good.
• the gas barrier property tends to be good.
• the ethylene unit content of EVOH can be determined by a nuclear magnetic resonance (NMR) method.
• the ethylene unit content of EVOH (a2) is not particularly limited as long as it is higher than EVOH (a1), but may be, for example, 20 mol% or more and 60 mol% or less.
• the ethylene unit content of EVOH (a2) is preferably 40 mol% or more, more preferably 42 mol% or more.
• the ethylene unit content of EVOH (a2) is preferably 55 mol% or less, more preferably 50 mol% or less.
• the difference is not particularly limited, but from the viewpoint of maintaining gas barrier properties and further enhancing blocking resistance, EVOH (a2) and EVOH (
• the difference in ethylene unit content (a2-a1) from a1) is preferably 3 mol% or more, more preferably 6 mol% or more, still more preferably 8 mol% or more.
• the ethylene unit content difference (a2-a1) may be 30 mol% or less or 20 mol% or less.
• the multilayer film of the present invention has an ethylene unit content of EVOH (a1) of less than 40 mol% and an ethylene unit content of EVOH (a2) of 40 mol% or more in the resin composition (A) layer. It is preferable from the viewpoint of exhibiting the gas barrier property and the appearance characteristics after stretching (suppression of film surface roughness) in a well-balanced manner, the ethylene unit content of EVOH (a1) is less than 37 mol%, and the ethylene unit content of EVOH (a2) is contained. More preferably, the amount is 42 mol% or more.
• the saponification degree of the vinyl ester unit of EVOH (a1) and EVOH (a2) is preferably 90 mol% or more, more preferably 98 mol% or more, further preferably 99 mol% or more, and may be 100 mol%. ..
• the saponification degree of EVOH can be determined by a nuclear magnetic resonance (NMR) method.
• EVOH (a1) and EVOH (a2) may have units derived from a monomer other than ethylene, vinyl ester and a saponified product thereof, as long as the object of the present invention is not impaired.
• the content of each of the other monomeric units relative to each structural unit of EVOH (a1) and EVOH (a2) is , 30 mol% or less, more preferably 20 mol% or less, further preferably 10 mol% or less, and particularly preferably 5 mol% or less.
• the lower limit thereof may be 0.05 mol% or 0.10 mol%. ..
• Examples of the other monomer include alkenes such as propylene, butylene, penten, and hexene; 3-allyloxy-1-propene, 3-acyloxy-1-butene, 4-acyloxy-1-butene, 3,4-.
• vinyl silane compounds such as vinyl trimethoxysilane, vinyl triethoxysilane, vinyl tri ( ⁇ -methoxy-ethoxy) silane, ⁇ -methacryloxypropyl methoxysilane; alkyl vinyl ethers, vinyl ketone, N-vinylpyrrolidone, vinyl chloride , Vinylidene chloride and the like.
• EVOH (a1) and EVOH (a2) may be post-denatured by a method such as urethanization, acetalization, cyanoethylation, or oxyalkyleneization.
• the melt flow rate (MFR) at 210 ° C. and 2160 g load measured according to JIS K 7210: 2014 of EVOH (a1) is preferably 1.0 g / 10 minutes or more, more preferably 3.0 g / 10 minutes or more, and 6.0 g. / 10 minutes or more is more preferable.
• MFR of EVOH (a1) is at least the above lower limit, the fluidity of the resin during inflation molding is improved, and adhesion to the rheumatism of the die lip tends to be suppressed.
• the MFR of EVOH (a1) may be 30.0 g / 10 minutes or less, or 20.0 g / 10 minutes or less.
• the melt flow rate (MFR) at 210 ° C. and 2160 g load measured according to JIS K 7210: 2014 of EVOH (a2) is preferably 3.0 g / 10 minutes or more, more preferably 5.0 g / 10 minutes or more, and 7.0 g. / 10 minutes or more is more preferable, and 10.0 g / 10 minutes or more is particularly preferable.
• MFR of EVOH (a2) is at least the above lower limit, the fluidity of the resin during inflation molding is improved, and adhesion to the rheumatism of the die lip tends to be suppressed. Further, the MFR of EVOH (a2) may be 30.0 g / 10 minutes or less, or 20.0 g / 10 minutes or less.
• the MFR in the above is preferably 5 to 30 g / 10 minutes, more preferably 7 to 25 g / 10 minutes. Further, from the viewpoint of further suppressing adhesion to the rheumatism of the die lip, the MFR at 210 ° C.
• the mass ratio [a1 / a2] of EVOH (a1) to EVOH (a2) in the resin composition (A) layer is preferably 2/98 or more, more preferably 40/60 or more, still more preferably 57/43 or more. 70/30 or more is even more preferable, and 75/25 or more is particularly preferable.
• the mass ratio [a1 / a2] is preferably 98/2 or less, more preferably 96/4 or less, and even more preferably 92/8 or less.
• the mass ratio [a1 / a2] is 98/2 or less, the blocking resistance tends to be good.
• EVOH (a1) and EVOH (a2) may be used alone or may be contained in two or more types. Further, the resin composition (A) layer may further contain another EVOH having an ethylene unit content different from that of EVOH (a1) and EVOH (a2).
• the resin composition (A) layer is, for example, an antistatic agent, a processing aid, a resin other than EVOH (a1) and EVOH (a2), a carboxylic acid compound, and a phosphoric acid as long as the effect of the present invention is not impaired.
• the blocking inhibitor is an inorganic oxide, an inorganic nitride, or an inorganic oxide nitride selected from silicon, aluminum, magnesium, zirconium, cerium, tungsten, molybdenum, and the like. Among them, silicon oxide is desirable because of its availability. When the resin composition (A) layer contains a blocking inhibitor, the blocking resistance tends to be further enhanced.
• processing aid examples include fluorine-based processing aids such as Arkema's Kynar (trademark) and 3M's Dynamer (trademark).
• fluorine-based processing aids such as Arkema's Kynar (trademark) and 3M's Dynamer (trademark).
• resins other than EVOH (a1) and EVOH (a2) include polyolefins, polyamides, polyvinyl chlorides, polyvinylidene chlorides, polyesters, polystyrenes, epoxy resins, acrylic resins, urethane resins, polyester resins and the like. These resins may be acid-modified resins.
• the carboxylic acid may be a monocarboxylic acid, a polyvalent carboxylic acid, or a combination thereof. Further, the carboxylic acid may be an ion, and the carboxylic acid ion may form a salt with a metal ion.
• the resin composition (A) layer contains a phosphoric acid compound, it tends to be difficult to color during melt molding.
• the phosphoric acid compound is not particularly limited, and various acids such as phosphoric acid and phosphite and salts thereof can be used.
• the phosphate may be contained in any form of a first phosphate, a second phosphate, or a third phosphate, but the first phosphate is preferable.
• the cation species is also not particularly limited, but an alkali metal salt is preferable. Of these, sodium dihydrogen phosphate and potassium dihydrogen phosphate are preferable.
• the content of the phosphoric acid compound is preferably 5 to 200 ppm in terms of phosphoric acid root.
• the content of the phosphoric acid compound is 5 ppm or more, the color resistance during melt molding tends to be good.
• the content of the phosphoric acid compound is 200 ppm or less, the melt moldability tends to be good, and more preferably 160 ppm or less.
• the boron compound is not particularly limited, and examples thereof include boric acids, borate esters, borates, and boron hydrides.
• examples of boric acids include orthoboric acid, metaboric acid, tetraboric acid and the like
• examples of boric acid esters include triethyl borate, trimethyl borate and the like
• examples of borate salts include the above-mentioned various boric acids. Examples thereof include acid alkali metal salts, alkaline earth metal salts, and boric acid.
• orthoboric acid (hereinafter, may be simply referred to as boric acid) is preferable.
• the content of the boron compound is preferably 20 to 2000 ppm in terms of boron element.
• the torque fluctuation at the time of heating and melting tends to be suppressed, and more preferably 50 ppm or more.
• the content of the boron compound is 2000 ppm or less, the moldability tends to be good, and more preferably 1000 ppm or less.
• the resin composition (A) layer contains an alkali metal salt
• the resin composition (A) layer and another resin layer for example, a thermoplastic resin (B) layer or an adhesive resin (C)
• a thermoplastic resin (B) layer or an adhesive resin (C) are used in the multilayer film of the present invention.
• Layer tends to have good interlayer adhesion.
• the cationic species of the alkali metal salt is not particularly limited, but a sodium salt or a potassium salt is preferable.
• the anionic species of the alkali metal salt is also not particularly limited.
• the resin composition (A) layer contains an alkali metal salt
• the content of the alkali metal salt is preferably 10 to 500 ppm in terms of metal element.
• the content of the alkali metal salt is more preferably 50 ppm or more.
• the melt stability tends to be good, and more preferably 300 ppm or less.
• the cationic species of the alkaline earth metal salt is not particularly limited, but a magnesium salt or a calcium salt is preferable.
• the anionic species of the alkaline earth metal salt is also not particularly limited. It can be added as a carboxylate, a carbonate, a hydrogen carbonate, a phosphate, a hydrogen phosphate, a hydrochloride, a nitrate, a sulfate, a borate, a hydroxide and the like.
• Stabilizers for improving melt stability include hydrotalcite compounds, hindered phenol-based heat stabilizers, hindered amine-based heat stabilizers, and metal salts of higher aliphatic carboxylic acids (for example, calcium stearate and magnesium stearate). Etc.), etc., and when the resin composition (A) layer contains a stabilizer, the content thereof is preferably 0.001 to 1% by mass.
• Antioxidants include 2,5-di-t-butyl-hydroquinone, 2,6-di-t-butyl-p-cresol, 4,4'-thiobis- (6-t-butylphenol), 2,2. '-Methylene-bis- (4-methyl-6-t-butylphenol), octadecyl-3- (3', 5'-di-t-butyl-4'-hydroxyphenyl) propionate, 4,4'-thiobis- (6-t-Butylphenol) and the like can be mentioned.
• ultraviolet absorber examples include ethylene-2-cyano-3', 3'-diphenylacrylate, 2- (2'-hydroxy-5'-methylphenyl) benzotriazole, and 2- (2'-hydroxy-3'-t. -Butyl-5'-methylphenyl) 5-chlorobenzotriazole, 2-hydroxy-4-methoxybenzophenone, 2,2'-dihydroxy-4-methoxybenzophenone and the like can be mentioned.
• plasticizer examples include dimethyl phthalate, diethyl phthalate, dioctyl phthalate, wax, liquid paraffin, and phosphoric acid ester.
• antistatic agent examples include pentaerythlit monostearate, sorbitan monopalmitate, sulfated polyolefins, polyethylene oxide, carbowax and the like.
• lubricant examples include ethylene bisstearoamide and butyl stearate.
• colorant examples include carbon black, phthalocyanine, quinacridone, indoline, azo pigments, red iron oxide, and the like.
• filler examples include glass fiber, asbestos, ballast night, calcium silicate and the like.
• the ratio of EVOH (a1) and EVOH (a2) as the resin constituting the resin composition (A) layer is preferably 80% by mass or more, more preferably 90% by mass or more, further preferably 95% by mass or more. 98% by mass or more is particularly preferable, and the resin constituting the resin composition (A) layer may be substantially composed of EVOH (a1) and EVOH (a2) only, and EVOH (a1) and EVOH (a2). ) Only.
• the proportion of EVOH (a1) and EVOH (a2) in the resin composition (A) layer is preferably 80% by mass or more, more preferably 90% by mass or more, further preferably 95% by mass or more, and 98% by mass. % Or more is particularly preferable, and the resin composition (A) layer may be substantially composed of only EVOH (a1) and EVOH (a2), and may be composed of only EVOH (a1) and EVOH (a2). You may.
• the thickness of the resin composition (A) layer is preferably 0.5 ⁇ m or more, more preferably 0.8 ⁇ m or more, and may be 1 ⁇ m or more. When the thickness of the resin composition (A) layer is 0.5 ⁇ m or more, the gas barrier property tends to be improved.
• the thickness of the resin composition (A) layer is preferably 20 ⁇ m or less, more preferably 10 ⁇ m or less, and may be 5 ⁇ m or less. When the thickness of the resin composition (A) layer is 20 ⁇ m or less, the appearance characteristics (film surface) after stretching tend to be good.
• the suitable thickness of the resin composition (A) layer means the thickness after stretching.
• the ratio of the thickness of the resin composition (A) layer to the total thickness of all the layers of the multilayer film of the present invention is preferably 30% or less, more preferably 20% or less from the viewpoint of industrial productivity and mechanical properties. It may be less than% or less than 5%.
• the multilayer film of the present invention may have an EVOH layer different from the resin composition (A) layer from the viewpoint of further enhancing the gas barrier property, and the number of layers is not particularly limited.
• thermoplastic resin (B) layer By including the thermoplastic resin (B) layer, the multilayer film of the present invention can enhance the mechanical strength of the multilayer film of the present invention and the barrier property against water vapor. Further, by forming a film with the resin composition (A) layer in multiple layers, the film thickness of the resin composition (A) layer tends to be reduced, and as a result, the multilayer structure of the present invention described later is recycled. Tends to be easier. Further, characteristics such as heat sealability and mechanical strength can be imparted according to the type of the thermoplastic resin constituting the thermoplastic resin (B) layer.
• thermoplastic resin (B) layer examples include linear low-density polyethylene, low-density polyethylene, ultra-low-density polyethylene, medium-density polyethylene, high-density polyethylene and other polyethylenes, and ethylene-vinyl acetate copolymers.
• ethylene-propylene block or random copolymer, ethylene- (meth) acrylic acid copolymer, ethylene- (meth) acrylic acid ester copolymer, polypropylene, propylene- ⁇ -olefin copolymer, polybutene
• Polyolefins such as olefins such as polypentene alone or copolymers, or those obtained by graft-modifying them with unsaturated carboxylic acids or esters thereof; polyesters; polyamides (including copolymerized polyamides); polyvinyl chlorides; polyvinylidene chlorides; Acrylic resin; polystyrene; polyvinyl ester; polyester elastomer; polyurethane elastomer; chlorinated polystyrene; chlorinated polypropylene; aromatic polyketone or aliphatic polyketone, and polyalcohol obtained by reducing these; polyacetal; polycarbonate and the like can be mentioned.
• the thermoplastic resin (B) layer contains polyethylene as a main component.
• the "main component” means a component whose proportion in the thermoplastic resin (B) layer is more than 50% by mass.
• the proportion of polyethylene in the thermoplastic resin (B) layer is preferably 80% by mass or more, more preferably 90% by mass or more, and further preferably the thermoplastic resin (B) layer is composed of only polyethylene. Since polyethylene is widely used as a packaging material regardless of its gas barrier property, its recycling infrastructure is widely developed in each country.
• polyethylene is preferably used because it can be molded at a lower temperature than polypropylene and can be heat-sealed at a lower temperature and has excellent strength.
• the thermoplastic resin (B) layer contains polyethylene as a main component
• the polyethylene is preferably at least one selected from linear low-density polyethylene, low-density polyethylene, medium-density polyethylene, and high-density polyethylene.
• At least one selected from linear low-density polyethylene and low-density polyethylene, or a mixture of at least one selected from linear low-density polyethylene and low-density polyethylene and high-density polyethylene is more preferable. ..
• the proportion of the thermoplastic resin in the thermoplastic resin (B) layer is preferably 80% by mass or more, more preferably 90% by mass or more, further preferably 95% by mass or more, particularly preferably 98% by mass or more, and heat.
• the plastic resin (B) layer may be substantially composed of only the thermoplastic resin, or may be composed of only the thermoplastic resin.
• the melt flow rate (MFR) at 190 ° C. and 2160 g load measured according to JIS K 7210: 2014 of the thermoplastic resin constituting the thermoplastic resin (B) layer is preferably 0.10 to 10.0 g / 10 minutes, and 0. More preferably, 30 to 5.0 g / 10 minutes.
• MFR of the thermoplastic resin constituting the thermoplastic resin (B) layer is within the above range, the molding stability during inflation molding tends to be improved.
• the thickness of the thermoplastic resin (B) layer is preferably 7 to 100 ⁇ m, more preferably 10 to 50 ⁇ m, from the viewpoint of industrial productivity and mechanical properties.
• the suitable thickness of the thermoplastic resin (B) layer means the thickness after stretching. When a plurality of thermoplastic resin (B) layers are provided, the total thickness thereof is preferably in the above range.
• the thermoplastic resin (B) layer may be provided as one layer or a plurality of layers.
• thermoplastic resin (B) layers When a plurality of thermoplastic resin (B) layers are provided, and when the thermoplastic resin (B) layers provided with the same material are continuously laminated, they are regarded as one layer.
• thermoplastic resin (B) layer for a multilayer film of a thermoplastic resin (B) layer / a thermoplastic resin (B) layer / a thermoplastic resin (B) layer / an adhesive resin (C) layer / a resin composition (A) layer
• a thermoplastic resin When the materials of the B) layer are all the same, the multilayer film is regarded as a multilayer film of the thermoplastic resin (B) layer / adhesive resin (C) layer / resin composition (A) layer, and the thermoplastic resin (B) B)
• the thickness per layer is the total thickness of the three layers.
• the materials of the thermoplastic resin (B) layer are different in the above example, they are considered as independent layers.
• the "/" used in the configuration example of the multilayer film means that the layers on both sides thereof are directly laminated.
• the multilayer film of the present invention preferably has an adhesive resin (C) layer, and the resin composition (resin composition). It is more preferable that the A) layer and the thermoplastic resin (B) layer are laminated via the adhesive resin (C) layer. Further, when the multilayer structure of the present invention described later is recycled, if the adhesive resin (C) layer is present, the compatibility between the resin composition (A) layer and the thermoplastic resin (B) layer can be enhanced. Since the recyclability tends to be improved, it is preferable to have the adhesive resin (C) layer from that viewpoint as well.
• the adhesive resin constituting the adhesive resin (C) layer it is preferable to use a polyolefin having a carboxy group, a carboxylic acid anhydride group or an epoxy group, and it is more preferable to use a polyolefin having a carboxylic acid anhydride group. ..
• Such an adhesive resin is also excellent in adhesiveness to the resin composition (A) layer or the thermoplastic resin (B) layer.
• polyolefin containing a carboxy group examples include polyolefins copolymerized with acrylic acid and methacrylic acid. At this time, as represented by ionomer, all or part of the carboxyl groups contained in the polyolefin may be present in the form of a metal salt.
• the polyolefin having a carboxylic acid anhydride group examples include polyolefins graft-modified with maleic anhydride and itaconic acid.
• examples of the polyolefin having an epoxy group examples include a polyolefin copolymerized with glycidyl methacrylate. Among them, a polyolefin having a carboxylic acid anhydride group such as maleic anhydride is preferably used, and a polyethylene having a carboxylic acid anhydride group is particularly preferable.
• the melt flow rate (MFR) at 190 ° C. and 2160 g load measured according to JIS K 7210: 2014 of the adhesive resin constituting the adhesive resin (C) is preferably 0.1 to 20.0 g / 10 minutes, preferably 1.0. More preferably ⁇ 10.0 g / 10 minutes.
• MFR of the thermoplastic resin (C) is within the above range, the film-forming stability tends to be good during inflation molding.
• the thickness of the adhesive resin (C) layer is preferably 0.5 to 20 ⁇ m, more preferably 1 to 10 ⁇ m, from the viewpoint of industrial productivity and quality stability.
• the suitable thickness of the adhesive resin (C) layer means the thickness after stretching.
• the layer structure of the multilayer film of the present invention is not particularly limited as long as the outermost layer includes the resin composition (A) layer and the thermoplastic resin (B) layer.
• the resin composition (A) layer is referred to as "layer (A)”
• the thermoplastic resin (B) layer is referred to as “layer (B)”
• the adhesive resin (C) layer is referred to as "layer (C)”.
• the adhesive resin (C) layer may not be provided, but it is preferable to have the adhesive resin (C) layer from the viewpoint of quality stability and recyclability.
• "/" means that the layers on both sides thereof are directly laminated.
• the layer structure of the multilayer film of the present invention includes, for example, layer (B) / layer (C) / layer (A), layer (B) / layer (C) / layer (A) / layer (C) / layer ( A), layer (A) / layer (C) / layer (B) / layer (C) / layer (A), layer (B) / layer (C) / layer (A) / layer (C) / layer ( B) / layer (C) / layer (A) and the like can be mentioned, and among them, layer (B) / layer (C) / layer (A) is preferable from the viewpoint of industrial productivity.
• the overall thickness of the multilayer film of the present invention can be appropriately set according to the application.
• the total thickness is preferably 10 ⁇ m or more, more preferably 15 ⁇ m or more. When the total thickness is 10 ⁇ m or more, industrial productivity and mechanical properties tend to be improved.
• the total thickness is preferably 100 ⁇ m or less, more preferably 50 ⁇ m or less. When the total thickness is 100 ⁇ m or less, industrial productivity and economic efficiency tend to be improved.
• the suitable overall thickness of the multilayer film means the thickness after stretching.
• the method for producing the multilayer film of the present invention is not particularly limited, and in general, a conventional coextrusion method in which each resin is extruded from a separate die or a common die and laminated can be used.
• a conventional coextrusion method in which each resin is extruded from a separate die or a common die and laminated can be used.
• the die either an annular die or a T die can be used, and examples thereof include cast molding and inflation molding.
• the inflation molded body means a molded product that has been molded through inflation molding, and is obtained, for example, by undergoing secondary processing (for example, press molding) after being formed by inflation molding.
• Packaging containers and the like also fall under the category of inflation molded articles.
• the production method of the present invention is, for example, cast molding. It is preferable to include a step of stretching in a state where the resin composition (A) layers are in contact with each other, such as laminating and stretching the multilayer film obtained in the above manner so that the resin composition (A) layers are in contact with each other.
• inflation molding is used in producing the multilayer film of the present invention
• a known means can be used as the inflation molding method.
• the multilayer film of the present invention is stretched at least 3 times or more and 12 times or less in the uniaxial direction. If the lengthening of the multilayer film of the present invention is less than three times, the thickness unevenness due to the stretching tends to occur and the gas barrier property tends to decrease. On the other hand, if the multilayer film of the present invention is stretched more than 12 times, the film surface after stretching tends to be deteriorated.
• the multilayer film of the present invention is preferably stretched at least 4 times or more in the uniaxial direction, and more preferably 5 times or more. Further, the multilayer film of the present invention is preferably stretched at least 10 times or less in the uniaxial direction, and more preferably 8 times or less.
• the multilayer film of the present invention may be stretched uniaxially or biaxially, but from the viewpoint of economy, the multilayer film is easily torn (when used as a packaging material, the packaging material is opened. From the viewpoint of easy), uniaxial stretching is preferable, and longitudinal (MD direction) uniaxial stretching is particularly preferable. In this case, it is preferable that the material is not substantially stretched in the width direction (TD direction). Further, even when the multilayer film of the present invention is biaxially stretched, it is preferably stretched mainly in the longitudinal direction (MD direction), and the stretching ratio in the longitudinal direction (MD direction) and the width direction (TD direction).
• the draw ratio ratio (MD / TD) of is preferably 3 or more, more preferably 4 or more, and even more preferably 5 or more.
• the draw ratio ratio (MD / TD) may be 12 or less. If the stretching is less than 3 times, even if the resin composition (A) layers are stretched in contact with each other, blocking tends to be less likely to occur, so that the merit of applying the present invention is reduced.
• the method for stretching the multilayer film of the present invention is not particularly limited, and examples thereof include a tenter stretching method, a tubular stretching method, and a roll stretching method. From the viewpoint of manufacturing cost, uniaxial stretching by the roll stretching method is preferable. Further, when the multilayer film of the present invention is an inflation molded product, the roll stretching method is preferable from the viewpoint that the folded cylindrical multilayer film after inflation molding can be easily stretched in the uniaxial direction.
• the resin composition (A) layer and the thermoplastic resin (B) layer are provided by inflation molding, and the outermost layer on the inner surface side is the resin composition (A).
• the preferred production method of the present invention will be described in detail below, but the aspects of the present invention are not limited thereto.
• step (I) the resin composition containing EVOH (a1) and EVOH (a2) and the thermoplastic resin are melt-extruded from an annular die to form a cylindrical multilayer film.
• the resin composition (A) layer is used as the outermost layer on the inner surface side from the viewpoint of suppressing thermal deterioration of EVOH and adhesion to the rheumatism of the die lip.
• the resin composition (A) layer is used as the outermost layer on the outer surface side, the problem of blocking in the stretching step described later is eliminated, but there is a concern about thermal deterioration of EVOH due to the extension of the melting time due to the extension of the flow path.
• the resin composition (A) layer is the outermost layer on the inner surface side. Compared with the case of, the adhesion of the eye resin tends to increase.
• the melt-extruded cylindrical multilayer film is supplied with gas to the inner space and is expanded to a predetermined size by the internal pressure.
• the expanded cylindrical multilayer film is folded with a pair of nip rolls so that the inner surfaces are in contact with each other, and wound up with the roll.
• conditions such as a blow-up ratio indicating the degree of expansion and a take-up speed of winding with a roll are not particularly limited, and known conditions can be appropriately selected.
• step (II) the multilayer film folded in step (I) is stretched at least in the uniaxial direction.
• the temperature at the time of stretching is generally in the temperature range of 50 ° C to 130 ° C.
• the tenter stretching method is preferably used for biaxial stretching.
• simultaneous biaxial stretching when the temperature is in the temperature range of 70 ° C. to 100 ° C., a biaxially stretched film having few stretch spots can be obtained.
• sequential biaxial stretching a temperature range of 70 ° C. to 100 ° C. for stretching in the longitudinal direction of the roll and 80 ° C. to 120 ° C. for stretching in the width direction of the roll is adopted, so that there are few stretching spots.
• a shaft stretched film is obtained.
• step (III) at least a part of the stretched cylindrical multilayer film obtained in step (II) is cut to obtain a flat multilayer film.
• the multilayer film of the present invention obtained through the step (III) can be obtained from another layer (a layer) on the outermost layer of the resin composition (A) when, for example, a vapor-deposited multilayer film or a multilayer structure described later is produced.
• Inorganic vapor deposition (D) layer or thermoplastic resin (E) layer) tends to be easily laminated.
• a vapor-deposited multilayer film in which an inorganic vapor-deposited (D) layer is adjacent to the exposed surface side of the resin composition (A) layer of the multilayer film of the present invention is a preferred embodiment of the multilayer film.
• adjacent means that they are in direct contact with each other. Since the resin composition (A) layer has a good affinity with the inorganic vapor deposition (D) layer, the vapor-deposited multilayer film of the present invention has a high gas barrier property and is subjected to physical stress such as bending. Even in this case, there is a tendency that good gas barrier properties can be maintained.
• the inorganic thin-film (D) layer is usually a layer having a barrier property against oxygen and water vapor. Therefore, the thin-film vapor-deposited multilayer film of the present invention tends to have a good gas barrier property by containing the inorganic thin-film (D) layer.
• the inorganic vapor deposition (D) layer can be formed by depositing an inorganic substance. Inorganic substances include metals (eg, aluminum), metal oxides (eg, silicon oxide, aluminum oxide), metal nitrides (eg, silicon nitride), metal nitrides (eg, silicon nitride), or metal nitrides.
• the inorganic vapor deposition (D) layer formed of aluminum, aluminum oxide, silicon oxide, magnesium oxide, or silicon nitride is preferable from the viewpoint of industrial productivity, and the inorganic vapor deposition (D) layer formed of aluminum is more preferable. preferable. Even if it is a metal-deposited layer of aluminum, it is irreversibly oxidized and may partially contain aluminum oxide. When the metal vapor deposition layer partially contains aluminum oxide, the ratio (O mol / Al mol ) of the substance amount (O mol ) of the oxygen atom to the substance amount (Al mol ) of the aluminum atom constituting the metal vapor deposition layer is 0. It is preferably 5.5 or less, more preferably 0.3 or less, further preferably 0.1 or less, and particularly preferably 0.05 or less.
• the method for forming the inorganic vapor deposition (D) layer is not particularly limited, and physical vapor deposition such as vacuum vapor deposition (for example, resistance heating vapor deposition, electron beam deposition, molecular beam epitaxy method, etc.), sputtering method, ion plating method, etc. Methods; Thermochemical Vapor Deposition (eg, Catalytic Chemical Vapor Deposition), Photochemical Vapor Deposition, Plasma Chemical Vapor Deposition (eg, Capacitive Bonded Plasma, Induced Bonded Plasma, Surface Wave Plasma, Electron Cyclotron Resonance, Dual magnetron, atomic layer deposition method, etc.), chemical vapor deposition method such as organic metal vapor deposition method, etc. can be mentioned.
• vacuum vapor deposition for example, resistance heating vapor deposition, electron beam deposition, molecular beam epitaxy method, etc.
• sputtering method ion plating method, etc.
• ion plating method etc.
• the inorganic vapor deposition (D) layer is provided adjacent to the exposed surface side of the resin composition (A) layer of the multilayer film of the present invention.
• the average thickness of the inorganic thin-film (D) layer is preferably 150 nm or less, more preferably 120 nm or less, and even more preferably 100 nm or less.
• the average thickness of the inorganic thin-film (D) layer is preferably 10 nm or more, more preferably 15 nm or more, and even more preferably 20 nm or more.
• the average thickness of the inorganic thin-film (D) layer is an average value of the thickness at any 10 points of the inorganic vapor deposition (D) layer cross section measured by an electron microscope. From the viewpoint of reducing the coloring of the recovered composition of the multilayer structure, when the multilayer structure has a plurality of inorganic vapor deposition (D) layers, the total thickness of the inorganic vapor deposition (D) layers is preferably 1 ⁇ m or less.
• the layer structure of the vapor-deposited multilayer film of the present invention is not particularly limited as long as the inorganic vapor-deposited (D) layer is adjacent to the surface side of the resin composition (A) layer of the multilayer film of the present invention.
• the layer (B) / layer (C) / layer (A) / layer (D) is preferable.
• the multilayer film and the vapor-deposited multilayer film of the present invention may be a multilayer structure further including a thermoplastic resin (E) layer.
• the film thickness ratio of the resin composition (A) layer in the multilayer structure of the present invention tends to be reduced, and as a result, the thickness ratio of the resin composition (A) layer tends to be reduced.
• the multi-layer structure of the present invention which will be described later, tends to be easily recycled. Further, characteristics such as heat sealability and mechanical strength can be imparted according to the type of the thermoplastic resin constituting the thermoplastic resin (E) layer.
• thermoplastic resin (E) layer When the thermoplastic resin (E) layer is laminated on the vapor-deposited multilayer film of the present invention to obtain the multilayer structure of the present invention, the thermoplastic resin (E) is on the exposed surface side of the inorganic vapor-deposited (D) layer of the vapor-deposited multilayer film. ) Layer is provided, and it is more preferable that an adhesive layer is provided between the inorganic vapor deposition (D) layer and the thermoplastic resin (E) layer.
• thermoplastic resin (E) layer examples include linear low-density polyethylene, low-density polyethylene, ultra-low-density polyethylene, medium-density polyethylene, high-density polyethylene and other polyethylenes, and ethylene-vinyl acetate copolymers.
• ethylene-propylene block or random copolymer, ethylene- (meth) acrylic acid copolymer, ethylene- (meth) acrylic acid ester copolymer, polypropylene, propylene- ⁇ -olefin copolymer, polybutene
• Polyolefins such as olefins such as polypentene alone or copolymers, or those obtained by graft-modifying them with unsaturated carboxylic acids or esters thereof; polyesters; polyamides (including copolymerized polyamides); polyvinyl chlorides; polyvinylidene chlorides; Acrylic resin; polystyrene; polyvinyl ester; polyester elastomer; polyurethane elastomer; chlorinated polystyrene; chlorinated polypropylene; aromatic polyketone or aliphatic polyketone, and polyalcohol obtained by reducing these; polyacetal; polycarbonate and the like can be mentioned.
• the thermoplastic resin (E) layer contains polyethylene as a main component, and more preferably it is composed of only polyethylene. Since polyethylene is widely used as a packaging material regardless of its gas barrier property, its recycling infrastructure is widely developed in each country. Further, polyethylene is preferably used because it can be molded at a lower temperature than polypropylene and can be heat-sealed at a lower temperature and has excellent strength.
• the polyethylene is preferably at least one selected from linear low-density polyethylene, low-density polyethylene, medium-density polyethylene, and high-density polyethylene. It is more preferably at least one selected from linear low-density polyethylene and low-density polyethylene, or a mixture of at least one selected from linear low-density polyethylene and low-density polyethylene and high-density polyethylene. ..
• Examples of the configuration of the multilayer structure of the present invention include layer (E) // layer (B) / layer (C) / layer (A), layer (E) // layer (B) / layer (C) / layer.
• the layer (E) // layer (B) / layer (C) / layer (A) / layer (D) is particularly excellent in gas barrier property, and from the viewpoint of providing a layer for printing or a heat seal layer on the multilayer structure.
• Layer (E) or layer (B) / layer (C) / layer (A) / layer (D) // layer (E) is preferable.
• "//" used in the above-mentioned configuration example means that it was laminated via an adhesive layer.
• thermoplastic resin (E) layer As a manufacturing method for obtaining a multilayer structure by laminating a thermoplastic resin (E) layer on a multilayer film or a vapor-deposited multilayer film of the present invention, various known manufacturing methods can be adopted. Extrusion laminating method, coextrusion laminating method, solution coating method, etc. can be adopted. When laminating the thermoplastic resin (E) layer, an adhesive layer may be provided between the multilayer film or vapor-deposited multilayer film of the present invention and the thermoplastic resin (E) layer.
• a known laminating adhesive such as a two-component reaction type polyurethane adhesive that mixes and reacts a polyisocyanate component and a polyol component is preferably used.
• the multilayer film, the vapor-deposited multilayer film and the multilayer structure of the present invention may be provided with a vapor-deposited layer in addition to the inorganic vapor-deposited (D) layer.
• a thin-film deposition layer may be provided, for example, by using a thermoplastic resin (B) layer or a thermoplastic resin (E) layer as a base material. That is, a thin-film deposition layer may be provided on the thermoplastic resin (B) layer or the thermoplastic resin (E) layer.
• a component constituting such a thin-film deposition layer a known component used as the thin-film deposition layer can be appropriately used.
• the multilayer structure of the present invention is preferably excellent in recyclability.
• post-consumer recycling hereinafter, sometimes simply abbreviated as recycling
• packaging materials consumed in the market are collected and recycled due to environmental problems and waste problems.
• recycling a process is generally adopted in which the recovered packaging material is cut, separated and washed as necessary, and then melt-mixed using an extruder.
• a polyester film, a polyamide film, or the like is recovered and recycled, it is difficult to uniformly mix it with other components in the melting and mixing step, which is an obstacle to recycling.
• the thermoplastic resin (B) layer and / or the thermoplastic resin (E) layer does not contain polyester and polyamide.
• the multilayer film, vapor-deposited multilayer film and multilayer structure of the present invention are polyolefin-based such as polyethylene or polypropylene (the main component of the multilayer structure is polyolefin), and in particular, recycling infrastructure is widely developed in each country. From the viewpoint, it is particularly preferable that it is polyethylene-based.
• EVOH has a melting temperature close to that of polyolefin and is excellent in recyclability.
• the proportion of polyolefin in the multilayer structure of the present invention is preferably 80% by mass or more, more preferably 90% by mass or more, still more preferably 95% by mass or more.
• the proportion of polyethylene in the multilayer structure of the present invention is preferably 80% by mass or more, more preferably 90% by mass or more, still more preferably 95% by mass or more.
• the multilayer film, vapor-deposited multilayer film and multilayer structure of the present invention can be suitably used as materials for various packagings such as food packaging, pharmaceutical packaging, industrial chemical packaging, pesticide packaging, etc., and in particular, a packaging material comprising the multilayer structure of the present invention.
• a packaging material comprising the multilayer structure of the present invention.
• OTR oxygen permeation rate
• 4-1) OTR oxygen permeation rate
• the oxygen permeation rate was measured with the resin composition (A) layer on the oxygen supply side and the thermoplastic resin (B) layer on the carrier gas side.
• the temperature is 20 ° C.
• the humidity on the oxygen supply side is 65% RH
• the humidity on the carrier gas side is 65% RH
• oxygen oxygen.
• the oxygen transmission rate (unit: cc / (m 2 ⁇ day ⁇ atm)) under the conditions of carrier gas pressure 1 atm was measured.
• the carrier gas nitrogen gas containing 2% by volume of hydrogen gas was used. The results were evaluated in the following two stages, A and B.
• Criteria A 0.5cc / (m 2 ⁇ day ⁇ atm) or more, 2cc / (m 2 ⁇ day ⁇ atm) under B: 2cc / (m 2 ⁇ day ⁇ atm) or more (4-2) after deposition OTR (Oxygen Permeation Rate)
• OTR Oxygen Permeation Rate
• the temperature is 20 ° C.
• the humidity on the oxygen supply side is 65% RH
• the humidity on the carrier gas side is 65% RH
• oxygen. pressure 1 atm the oxygen transmission rate (unit: cc / (m 2 ⁇ day ⁇ atm)) under the conditions of carrier gas pressure 1 atm was measured.
• the carrier gas nitrogen gas containing 2% by volume of hydrogen gas was used. The results were evaluated on the following three stages, A to C.
• thermoplastic resin (B) layer is laminated with three layers having a thickness of 30 ⁇ m, and as a result, the thermoplastic resin (B) layer having a thickness of 90 ⁇ m is formed as one layer.
• ⁇ Conditions for Thermoplastic Resin B
• Layer Extruder 3> Extruder: 20 ⁇ single-screw extruder (manufactured by Dr Collin). Rotation speed: 70 rpm.
• Extrusion temperature: Supply unit / compression unit / measurement unit 170 ° C / 190 ° C / 210 ° C.
• ⁇ Conditions for adhesive resin (C) layer extruder> Extruder: 20 ⁇ single-screw extruder (manufactured by Dr Collin). Rotation speed: 70 rpm.
• the obtained cylindrical multilayer film is folded so that the resin composition (A) layers overlap, and using a stretching device (SDR-506WK) manufactured by Eto Co., Ltd., the film is 6 times uniaxial in the longitudinal direction (MD direction) at 120 ° C.
• the subsequent multilayer film was subjected to blocking evaluation and film surface evaluation after stretching according to the methods described in the above evaluation methods (1) and (3). The results are shown in Table 1.
• thermoplastic resin (E) layer Using the obtained pre-evaporation and post-stretched multilayer film and the 30 ⁇ m uniaxially stretched PE film (E-1) and 50 ⁇ m LLDPE film (E-2) as the thermoplastic resin (E) layer, two types of the following layer configurations are used.
• a multilayer structure was produced.
• One layer structure is a multilayer structure composed of a thermoplastic resin (B) layer / adhesive resin (C) layer / resin composition (A) layer / LLDPE film, and the other layer structure is a uniaxially stretched PE film / heat.
• a multilayer structure composed of a plastic resin (B) layer / an adhesive resin (C) layer / a resin composition (A) layer / an inorganic vapor deposition (D) layer / an LLDPE film was produced.
• a two-component urethane adhesive (“Takelac A-520” and “Takenate A-50” manufactured by Mitsui Chemicals, Inc.) is dried. It was coated so as to have a thickness of 2 ⁇ m, and laminated by a dry laminating method.
• Examples 2 to 15, Comparative Examples 1 to 2 A multilayer film, a vapor-deposited multilayer film, and a multilayer structure are produced in the same manner as in Example 1 except that the types and ratios (a1 / a2) of EVOH (a1) and EVOH (a2) are changed as shown in Table 1. And evaluated. The results are shown in Table 1.
• Example 1 and Comparative Examples 1 and 2 that the blocking resistance is improved by having two types of EVOH (A) having different ethylene unit contents. From the comparison of Examples 1 to 6 and 10, when the ratio of EVOH (A) (a1 / a2) is less than 97/3, the results of blocking resistance, post-stretch film surface stability and die lip adhesion evaluation are further improved. It can be read that the gas barrier property is further improved when the value exceeds 50/50. From Examples 7 and 9, the ethylene unit content of the ethylene-vinyl alcohol copolymer (a1) is less than 40 mol%, and the ethylene unit content of the ethylene-vinyl alcohol copolymer (a2) is 40 mol% or more.
• the film surface after stretching tends to be improved while maintaining the oxygen barrier property of the multilayer film. From Examples 9, 10 and 13, it can be seen that when the melt flow rate of at least one of the ethylene-vinyl alcohol copolymers is 5 to 30 g / 10 minutes, the adhesion of dilip tends to be reduced. From Examples 10, 11 and 15, the ethylene-vinyl alcohol copolymer (a1) has an ethylene unit content of more than 27 mol% and less than 35 mol%, so that the oxygen barrier property of the multilayer film is maintained, and after stretching. It can be seen that the film surface stability tends to be good, and the oxygen barrier after aluminum vapor deposition also tends to be excellent.
• each of the multilayer structures obtained in Example 1 was pulverized to a size of 4 mm square or less, and a single layer film was formed under the extrusion conditions shown below to form a single layer having a thickness of 20 ⁇ m. Obtained each film. No bumps or streaks were found on the obtained monolayer film.

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