Classifications

• • 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
  • B29C55/14—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
  • 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
  • B29C48/022—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
  • B29C48/16—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
  • B29C55/005—Shaping by stretching, e.g. drawing through a die; Apparatus therefor characterised by the choice of materials
• • 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
  • B29C55/10—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
  • 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
  • B29C55/14—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets multiaxial biaxial successively
  • B29C55/143—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets multiaxial biaxial successively firstly parallel to the direction of feed and then transversely thereto
• • 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
  • B32—LAYERED PRODUCTS
  • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
  • B32B27/00—Layered products comprising a layer of synthetic resin
  • B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
  • B32B27/08—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
  • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
  • B32B27/00—Layered products comprising a layer of synthetic resin
  • B32B27/18—Layered products comprising a layer of synthetic resin characterised by the use of special additives
  • B32B27/20—Layered products comprising a layer of synthetic resin characterised by the use of special additives using fillers, pigments, thixotroping agents
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
  • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
  • B32B27/00—Layered products comprising a layer of synthetic resin
  • B32B27/34—Layered products comprising a layer of synthetic resin comprising polyamides
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
  • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
  • B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
  • B32B37/14—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers
  • B32B37/15—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers with at least one layer being manufactured and immediately laminated before reaching its stable state, e.g. in which a layer is extruded and laminated while in semi-molten state
  • B32B37/153—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers with at least one layer being manufactured and immediately laminated before reaching its stable state, e.g. in which a layer is extruded and laminated while in semi-molten state at least one layer is extruded and immediately laminated while in semi-molten state
• • 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
  • B32B38/00—Ancillary operations in connection with laminating processes
  • B32B38/0012—Mechanical treatment, e.g. roughening, deforming, stretching
• • 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
  • B29K2077/00—Use of PA, i.e. polyamides, e.g. polyesteramides or derivatives thereof, as moulding material
• • 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
  • B29L2007/00—Flat articles, e.g. films or sheets
• • 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
  • B29L2007/00—Flat articles, e.g. films or sheets
  • B29L2007/002—Panels; Plates; Sheets
• • 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
  • B29L2009/00—Layered 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
  • B32B38/00—Ancillary operations in connection with laminating processes
  • B32B38/0012—Mechanical treatment, e.g. roughening, deforming, stretching
  • B32B2038/0028—Stretching, elongating
• • 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
  • B32B2250/03—3 layers
• • 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
  • B32B2264/00—Composition or properties of particles which form a particulate layer or are present as additives
  • B32B2264/10—Inorganic particles
  • B32B2264/102—Oxide or hydroxide
  • B32B2264/1021—Silica
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
  • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
  • B32B2264/00—Composition or properties of particles which form a particulate layer or are present as additives
  • B32B2264/30—Particles characterised by physical dimension
  • B32B2264/303—Average diameter greater than 1µm
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
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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
  • B32—LAYERED PRODUCTS
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  • B32B2307/00—Properties of the layers or laminate
  • B32B2307/50—Properties of the layers or laminate having particular mechanical properties
  • B32B2307/514—Oriented
  • B32B2307/518—Oriented bi-axially
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
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  • B32B2307/00—Properties of the layers or laminate
  • B32B2307/50—Properties of the layers or laminate having particular mechanical properties
  • B32B2307/54—Yield strength; Tensile strength
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
  • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
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• • B—PERFORMING OPERATIONS; TRANSPORTING
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  • B32B2307/00—Properties of the layers or laminate
  • B32B2307/50—Properties of the layers or laminate having particular mechanical properties
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• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
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  • B32B2307/00—Properties of the layers or laminate
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• • B—PERFORMING OPERATIONS; TRANSPORTING
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• • B—PERFORMING OPERATIONS; TRANSPORTING
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• • B—PERFORMING OPERATIONS; TRANSPORTING
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• • B—PERFORMING OPERATIONS; TRANSPORTING
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• • B—PERFORMING OPERATIONS; TRANSPORTING
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  • B32B2553/00—Packaging equipment or accessories not otherwise provided for

Definitions

• the present invention relates to a biaxially stretched polyamide film having excellent adhesiveness.
• the present invention relates to a biaxially stretched polyamide film having excellent water resistance and adhesive strength with a sealant film.
• Biaxially stretched polyamide film is used as a packaging material, especially a material for food packaging, because it has excellent tensile strength, bending strength, pinhole resistance, oil resistance, oxygen gas barrier property, and the like.
• a biaxially stretched polyamide film is usually made by laminating (also called a laminate) a heat-sealable polyolefin film (also called a sealant film) such as polyethylene or polypropylene, and heat-sealing the edge of the bag to form a packaging bag or the like. used.
• Biaxially stretched polyamide films are widely used as food packaging materials.
• the polyamide 6/66 copolymer is less likely to be oriented and crystallized than the polyamide 6, the polyamide film containing a large amount of the polyamide 6/66 copolymer has a reduced mechanical strength even when the same stretching method is used. There is a problem that it ends up.
• a five-layer biaxially stretched polyamide film is proposed in which a layer containing polyamide 6 as a main component, a layer composed of polyamide 6 and polyamide 6/66, and a barrier layer containing an ethylene-vinyl acetate copolymer saponified product are laminated and extruded.
• a barrier layer containing an ethylene-vinyl acetate copolymer saponified product since it contains a barrier layer containing an ethylene-vinyl acetate copolymer saponified product, the film of the clip grip portion in the tenter cannot be recovered and reused.
• An object of the present invention is to solve the above-mentioned problems of a conventional biaxially stretched polyamide film, and not only has excellent adhesive strength, particularly water-resistant laminate strength, but also biaxial strength in which dots are less likely to come off during printing and mechanical strength is also excellent.
• An object of the present invention is to provide a stretched polyamide film at a low cost.
• the present inventors have laminated a substrate layer containing polyamide 6 as a main component with an easy-adhesive layer containing a polyamide 6 copolymer as a main component, and an easy-slip layer on the opposite side thereof. It has been found that the problem can be solved by a laminated stretched polyamide film formed under stretching conditions, and the present invention has been completed.
• a biaxially stretched film composed of at least three layers composed of a polyamide resin composition in the order of an easy-adhesion layer (B layer), a base material layer (A layer), and an easy-slip layer (C layer).
• a laminated stretched polyamide film characterized by satisfying (1) to (4).
• the layer A contains 10 to 50% by mass of the polyamide 6 copolymer having 50 to 90% by mass of polyamide 6 and 3 to 35% by mass of the copolymerization component in the copolymer.
• the B layer contains 60 to 100% by mass of the polyamide 6 copolymer and 0 to 40% by mass of the polyamide 6 in which the ratio of the copolymerization component in the copolymer is 3 to 35% by mass.
• the C layer contains 70% by mass or more of polyamide 6 and 0.05 to 1% by mass of fine particles having an average particle size of 0.1 to 10 ⁇ m.
• the tensile breaking strength in both the MD direction and the TD direction is 150 MPa or more.
• the laminate strength is 3.3 N / 15 mm or more.
• the polyamide 6 copolymer is a polyamide 6/66 copolymer.
• the thickness of the laminated stretched polyamide film is 5 to 30 ⁇ m, the thickness of the A layer is 4 ⁇ m or more, the thickness of the B layer is 0.5 ⁇ m or more, and the thickness of the C layer is 0.5 ⁇ m or more.
• the laminated stretched polyamide film according to the embodiment of the present invention has excellent tensile strength, impact strength, and bending strength of the biaxially stretched polyamide film due to the base material layer (layer A) containing 50 to 90% by mass of polyamide 6. Has pinhole resistance, oil resistance, and oxygen gas barrier resistance. Further, the easy-adhesion layer (B layer) can contribute to the above-mentioned excellent properties of the biaxially stretched polyamide film, and can extremely increase the lamination strength with the sealant film. In particular, the water resistant laminate strength can be significantly improved.
• the easy-slip layer can reduce the coefficient of friction by containing a predetermined amount of fine particles having an average particle diameter of 0.1 to 10 ⁇ m, and even when the laminated stretched polyamide film of the present invention is used as a bag. Since the bags have good slipperiness, the bags are excellent in transportability when filling the contents.
• the laminated stretched polyamide film of the present invention is a laminated polyamide film containing a layer containing a copolymerized polyamide that is difficult to be oriented and crystallized (difficult to increase the strength) by setting a specific plane orientation degree, but has mechanical strength. Excellent for.
• the laminated stretched polyamide film of the present invention has strong water-resistant laminate strength in addition to the excellent impact strength, pinhole resistance, oxygen gas barrier property, etc. of the biaxially stretched polyamide film. It is effective in preventing the packaging bag from breaking due to impact or vibration during transportation. Further, the laminated stretched polyamide film of the present invention has an advantage that the productivity is good and economical because the coating step for improving the adhesiveness can be omitted, and there are few defects such as scratches generated in the coating step. The laminated stretched polyamide film of the present invention has an advantage of being hygienic because the coating agent is not laminated.
• the ratio of the copolymerization component in the copolymer is 3 to 35% by mass on one surface of the base material layer (A layer) containing 50 to 90% by mass or more of polyamide 6.
• An easy-adhesion layer (B layer) containing 60 to 100% by mass and 0 to 40% by mass of a certain polyamide 6 copolymer, and fine particles having an average particle diameter of 0.1 to 10 ⁇ m on the surface opposite to the B layer.
• This is a laminated stretched polyamide film in which an easy-to-slip layer (C layer) containing 0.05 to 1% by mass of polyamide 6 as a main component is laminated.
• the total thickness of the laminated stretched polyamide film of the present invention is 5 to 30 ⁇ m.
• the thickness of the base material layer (layer A) of the laminated stretched polyamide film of the present invention is preferably 4.0 ⁇ m or more. More preferably, it is 4.5 ⁇ m or more. If the thickness of the base material layer (layer A) is thinner than 4.0 ⁇ m, the entire film may be too soft to be processed by a printing machine or a bag making machine.
• the thickness of the easy-adhesion layer (B layer) of the laminated stretched polyamide film of the present invention is preferably 0.5 ⁇ m or more.
• the thickness of the B layer is thinner than 0.5 ⁇ m, the water resistant laminate strength which is the object of the present invention cannot be obtained.
• the thickness of the B layer is thicker than 5 ⁇ m, the water-resistant laminate strength becomes saturated, while the strength of the entire film decreases, so 5 ⁇ m or less is preferable.
• the thickness of the slippery layer (C layer) of the laminated stretched polyamide film of the present invention is preferably 0.5 ⁇ m or more.
• the thickness of the C layer is thinner than 0.5 ⁇ m, the effect of improving the slipperiness is weakened. In addition, the thickness unevenness tends to increase.
• the base material layer (layer A) of the laminated stretched polyamide film of the present invention has a polyamide 6 ratio of 50 to 90% by mass.
• the amount of polyamide 6 is less than 50% by mass, sufficient impact strength, pinhole resistance, dimensional stability at high temperature, and transparency cannot be obtained.
• the polyamide 6 used for the base material layer (layer A) is usually produced by ring-opening polymerization of ⁇ -caprolactam.
• the polyamide 6 obtained by ring-opening polymerization is usually melt-extruded by an extruder after removing the ⁇ -caprolactam monomer with hot water and then drying.
• the relative viscosity of the polyamide 6 is preferably 1.8 to 4.5, more preferably 2.6 to 3.2. If the relative viscosity is less than 1.8, the impact strength of the film is insufficient. If it is larger than 4.5, the load on the extruder becomes large and it becomes difficult to obtain a sheet before stretching.
• the base material layer (layer A) contains 10 to 50% by mass of the polyamide 6 copolymer. By containing the polyamide 6 copolymer in the A layer, the adhesive strength between the A layer and the B layer can be increased.
• the polyamide 6 copolymer contained in the base material layer (A layer) preferably has the same copolymerization component as the polyamide 6 copolymer in the B layer.
• the layer A may contain 0.5 to 30% by mass of polyamide MXD6 (polymethaxylylene adipamide).
• polyamide MXD6 polymethaxylylene adipamide
• the layer A may contain 0.5 to 30% by mass of a polyamide elastomer or a polyolefin elastomer.
• a polyamide elastomer or a polyolefin elastomer By including a polyamide elastomer or a polyolefin elastomer, pinhole resistance can be improved.
• polyamide elastomer examples include a polyamide elastomer composed of a hard segment of nylon 12 and a soft segment of polytetramethylene glycol.
• Examples of the polyolefin elastomer used include block copolymers having polyolefin as a hard segment and various rubber components as soft segments.
• Examples of the polyolefin constituting the hard segment include ethylene, propylene, 1-butene, 1-pentene, 4-methyl-1-pentene, and the like.
• Examples of the rubber component constituting the soft segment include ethylene-propylene rubber (EPR), ethylene propylene diene rubber (EPDM), and polybutadiene.
• the easy-adhesion layer (B layer) of the laminated stretched polyamide film of the present invention contains 60 to 100% by mass of a polyamide 6 copolymer in which the ratio of the copolymerization component in the copolymer is 3 to 35% by mass. If the content of the polyamide 6 copolymer in the easy-adhesion layer (B layer) is less than 60% by mass, sufficient water-resistant laminate strength cannot be obtained.
• the ratio of the copolymerization component in the above-mentioned polyamide 6 copolymer is 3 to 35% by mass. If the ratio of the copolymerization component is less than 3% by mass, sufficient water resistant laminate strength cannot be obtained.
• the melting point of the polyamide 6 copolymer is preferably 170 to 220 ° C. More preferably, it is 175 to 215 ° C, and even more preferably 180 to 210 ° C. If the melting point of the polyamide 6 copolymer is higher than 215 ° C., sufficient water resistance and adhesiveness may not be obtained. If the melting point of the polyamide 6 copolymer is lower than 170 ° C., it may be difficult to handle when supplying the raw material.
• the polyamide 6 copolymer used for the easy-adhesion layer (B layer) is obtained by copolymerizing ⁇ -caprolactam or aminocaproic acid with a copolymerization component at a ratio of 3 to 35% by mass.
• the copolymerization ratio is mass% after removing the monomer remaining after the copolymerization with hot water or the like.
• a copolymerization component to ⁇ -caprolactam for example, it can be obtained by copolymerizing a salt of diamine with an amino acid other than ⁇ -caprolactam, an amino acid other than aminocaproic acid, or a dicarboxylic acid.
• Examples of the monomer copolymerized with ⁇ -caprolactam in the polymerization of the polyamide 6 copolymer include undecanelactam, lauryllactam, aminoundecanoic acid, aminolauric acid, adipic acid, pimeric acid, azelaic acid, sebacic acid, and terephthalic acid. , Isophthalic acid, hexamethylenediamine, nonanediamine, decanediamine, methylpentanediamine, metaxylylenediamine, trimethylhexamethylenediamine, and the like.
• polyamide 6 copolymer examples include a polyamide 6/66 copolymer, a polyamide 6/12 copolymer, a polyamide 6 / 6T copolymer, a polyamide 6/610 copolymer, and a polyamide 6/6 I copolymer. , Polyamide 6 / 9T copolymer, polyamide 6/11 copolymer, and the like.
• the polyamide 6/66 copolymer used for the easy-adhesion layer (B layer) can be obtained by a method of polymerizing from ⁇ -caprolactam and a hexamethylenediammonium adipate salt.
• Commercially available products such as Ultramid C3301 (manufactured by BASF) and Nylon 5023B (manufactured by Ube Industries, Ltd.) can also be used.
• the polyamide 6/66 copolymer which may be contained in the layer A in an amount of 0.5 to 30% by mass the above-mentioned one can be used.
• the copolymerization ratio of the polyamide 6 and the polyamide 66 in the polyamide 6/66 copolymer is such that the ratio of the polyamide 66 in the polyamide 6/66 copolymer is 3 to 35% by mass. It is preferably 5 to 30% by mass. More preferably, it is 5 to 25% by mass. When the ratio of the polyamide 66 in the polyamide 6/66 copolymer is less than 3% by mass, the easy adhesiveness which is the subject of the present invention is not exhibited. When the ratio of the polyamide 66 in the polyamide 6/66 copolymer is more than 35% by mass, the crystallinity of the copolymer becomes low and it may be difficult to handle.
• the relative viscosity of the polyamide 6/66 copolymer is preferably 1.8 to 4.5, more preferably 2.6 to 3.2.
• the polyamide 6/12 copolymer used for the easy-adhesion layer (B layer) can be obtained by a method of polymerizing from ⁇ -caprolactam and ⁇ -lauryl lactam. Commercially available products such as nylon resin 7024B (manufactured by Ube Industries, Ltd.) can also be used. As the polyamide 6/12 copolymer which may be contained in the layer A in an amount of 0.5 to 30% by mass, the above-mentioned one can be used.
• the ratio of the polyamide 12 in the polyamide 6/12 copolymer is 3 to 35% by mass. It is preferably 5 to 30% by mass. More preferably, it is 5 to 25% by mass.
• the ratio of the polyamide 12 in the polyamide 6/12 copolymer is less than 3% by mass, the easy adhesiveness which is the subject of the present invention is not exhibited.
• the ratio of the polyamide 12 in the polyamide 6/12 copolymer is more than 35% by mass, the crystallinity of the copolymer becomes low and it may be difficult to handle.
• the relative viscosity of the polyamide 6/12 copolymer is preferably 1.8 to 4.5, more preferably 2.5 to 4.0.
• An important point in the present invention is that the surface to be laminated with the sealant is laminated by laminating the easy-adhesion layer (B layer) containing the polyamide 6 copolymer on the surface of the base material layer (A layer) on the side to be laminated with the sealant.
• the point is that the degree of crystallinity is lowered and the adhesiveness is improved.
• the easy-to-slip layer (C layer) of the laminated stretched polyamide film of the present invention contains 70% by mass or more of polyamide 6 and 0.05 to 1% by mass of fine particles having an average particle size of 0.1 to 10 ⁇ m.
• the polyamide 6 in an amount of 70% by mass or more, the strength of the laminated stretched polyamide film can be maintained.
• minute protrusions are formed on the surface of the easy-to-slip layer (C layer), reducing contact between the laminated stretched film surfaces. Make the film slippery.
• the fine particles can be appropriately selected from inorganic lubricants such as silica, kaolin and zeolite, and polymer organic lubricants such as acrylic and polystyrene. From the viewpoint of transparency and slipperiness, it is preferable to use silica fine particles.
• the average particle size of the fine particles is preferably 0.5 to 5.0 ⁇ m, more preferably 1.0 to 3.0 ⁇ m. If the average particle size is less than 0.5 ⁇ m, a large amount of addition is required to obtain good slipperiness, and if it exceeds 5.0 ⁇ m, the surface roughness of the film becomes too large and the appearance deteriorates. It is not preferable because it does not satisfy the practical characteristics of.
• the range of the pore volume of the fine particles is preferably 0.5 to 2.0 ml / g, and more preferably 0.8 to 1.6 ml / g. If the pore volume is less than 0.5 ml / g, voids are likely to occur and the transparency of the film deteriorates, and if the pore volume exceeds 2.0 ml / g, surface protrusions due to fine particles are less likely to occur. This is not preferable because the slipperiness of the film deteriorates.
• the slippery layer (C layer) of the laminated stretched polyamide film of the present invention can contain fatty acid amide and / or fatty acid bisamide for the purpose of improving slipperiness.
• fatty acid amide and / or the fatty acid bisamide include erucic acid amide, stearic acid amide, ethylene bisstearic acid amide, ethylene bisbehenic acid amide, and ethylene bisoleic acid amide.
• the content of fatty acid amide and / or fatty acid bisamide in the polyamide polymer is preferably 0.01 to 0.40% by mass, and more preferably 0.05 to 0.30% by mass. If the content of fatty acid amide and / or fatty acid bisamide is less than the above range, the slipperiness is poor and the processability in printing, laminating, etc. is poor, and if it exceeds the above range, the surface is bleeded to the film surface over time. It may cause spots, which is not preferable in terms of quality.
• the base material layer (A layer), the easy-adhesive layer (B layer), and / or the easy-slip layer (C layer) of the laminated stretched polyamide film of the present invention are heat-resistant within a range that does not impair properties such as water-resistant laminate strength.
• Various additives such as stabilizers, antioxidants, antistatic agents, light-resistant agents, impact-resistant improvers, lubricants, and blocking inhibitors can be contained.
• the laminated stretched polyamide film of the present invention exhibits excellent bending fatigue resistance and impact resistance, and also has good processability such as laminating and bag making. Therefore, the laminated stretched polyamide film of the present invention has the following characteristics.
• the laminated stretched polyamide film of the present invention has a laminate strength of 3.3 N / 15 mm or more in both the MD direction and the TD direction, which is obtained by dry laminating the sealant film measured by the method described in Examples. Yes, it is preferably 3.5 N / 15 mm or more. When the laminate strength is 3.3 N / 15 mm or more, a packaging bag that is sufficiently hard to break can be obtained.
• the water-resistant lamination strength (lamination strength under water adhesion conditions) of the laminated stretched polyamide film of the present invention is preferably 2.0 N / 15 mm or more in both the MD direction and the TD direction, and more preferably 3.0 N / 15 mm or more. preferable. If the water resistant laminate strength is 2.0 N / 15 mm or more, it can be used for pickle bags and large water bags for business use.
• the tensile breaking strength of the laminated stretched polyamide film of the present invention is 150 MPa or more in both the MD direction and the TD direction, preferably 170 MPa or more. When the tensile breaking strength is 150 MPa or more, a packaging bag that is sufficiently difficult to break can be obtained.
• the impact strength of the laminated stretched polyamide film of the present invention is preferably 0.9 J / 15 ⁇ m or more, and more preferably 1.0 J / 15 ⁇ m or more. When the impact strength is 0.9 J / 15 ⁇ m or more, a packaging bag that is sufficiently hard to break can be obtained.
• the plane orientation ⁇ P measured by the method described in Examples of the laminated stretched polyamide film of the present invention is preferably 0.20 or more and 0.40 or less.
• the bending resistance pinhole resistance (the number of pinholes after the bending test) measured by the method described in the examples of the laminated stretched polyamide film of the present invention is preferably 20 or less, and more preferably 10 or less. If the number of pinholes after the bending test is 20 or less, the occurrence of pinholes can be suppressed against bending during transportation.
• the coefficient of dynamic friction measured by the method described in the examples of the laminated stretched polyamide film of the present invention is preferably 1.0 or less. 0.7 or less is more preferable. If the coefficient of kinetic friction is larger than 1.0, it becomes difficult to handle the film.
• the raw material resin is melt-extruded using an extruder, extruded into a film from a T-die, cast on a cooling roll and cooled to obtain an unstretched film.
• a method of laminating the easy-adhesion layer (B layer) and the easy-slip layer (C layer) on the base material layer (A layer) is preferable.
• a dry laminating method, an extrusion laminating method, or the like can also be selected.
• the relative viscosities of the polyamides used for the A layer, the B layer and the C layer are selected so that the difference in the melt viscosities of the A layer, the B layer and the C layer is small.
• the melting temperature of the resin is preferably 220 to 350 ° C. If it is less than the above, unmelted matter or the like may be generated, and appearance defects such as defects may occur. If it exceeds the above, deterioration of the resin or the like may be observed, and molecular weight or appearance may be deteriorated.
• the die temperature is preferably 250 to 350 ° C.
• the cooling roll temperature is preferably ⁇ 30 to 80 ° C., more preferably 0 to 50 ° C.
• a method using an air knife or an electrostatic adhesion method for imprinting an electrostatic charge is preferably applied. it can. In particular, the latter is preferably used.
• the opposite side of the cooling roll of the cast unstretched film It is also preferable to cool the opposite side of the cooling roll of the cast unstretched film.
• the unstretched film thus obtained is stretched in the biaxial direction to obtain the laminated stretched polyamide film of the present invention.
• the stretching method for obtaining the laminated stretched polyamide film of the present invention may be either a sequential biaxial stretching method or a simultaneous biaxial stretching method.
• the sequential biaxial stretching method is preferable because the film forming speed can be increased and it is advantageous in terms of manufacturing cost.
• a uniaxially stretched film obtained by a uniaxially stretched method may be used, and a uniaxially stretched polyamide film having good lamination strength can be obtained.
• the impact resistance and pinhole resistance of the biaxially stretched polyamide film are better.
• a normal sequential biaxial stretching device is used as the device.
• the manufacturing conditions are that the extrusion temperature is 200 ° C to 300 ° C, the stretching temperature in the longitudinal direction (which may be abbreviated as MD or MD direction), which is the flow direction of the device, is 50 to 100 ° C, and the stretching ratio in the longitudinal direction is 2.
• the stretching temperature in the width direction (may be abbreviated as TD or TD direction) of the device is 120 to 200 ° C., the stretching ratio in the width direction is 3 to 5 times, and the heat fixing temperature is in the range of 200 ° C. to 230 ° C. Is preferable.
• the stretching conditions in the longitudinal direction (MD) of the laminated stretched polyamide film of the present invention it is preferably stretched 3 times or more, more preferably 3.16 times or more, and most preferably 3.2 times or more. .. If the draw ratio in the longitudinal direction is smaller than 3 times, the degree of orientation of the film becomes small, and sufficient mechanical strength cannot be obtained.
• the stretch ratio in the longitudinal direction of the laminated polyamide film of the present invention is preferably 5 times or less, more preferably 4 times or less, and most preferably 3.5 times or less. If the draw ratio in the longitudinal direction is too high, not only the film formation becomes unstable, but also the orientation of the obtained film becomes too high, which may reduce the adhesiveness with the sealant film.
• the stretching conditions in the width direction (TD) of the laminated stretched polyamide film of the present invention are preferably 3.0 times or more, more preferably 3.2 times or more, and most preferably 3.5 times or more. If the draw ratio in the width direction is less than 3.0 times, not only the thickness unevenness of the film becomes worse, but also sufficient mechanical strength cannot be obtained.
• the draw ratio in the width direction of the laminated polyamide film of the present invention is preferably 5 times or less, more preferably 4.5 times or less, and most preferably 4.2 times or less. If the draw ratio in the width direction is too high, not only the film formation becomes unstable, but also the orientation of the obtained film becomes too high, which may reduce the adhesiveness with the sealant film.
• a coating layer may be provided between the layer containing the polyamide copolymer and the sealant layer.
• the coating agent is preferably water resistant in order to increase the water resistant laminate strength.
• corona treatment, flame treatment or the like may be performed.
• the present invention will be specifically described with reference to Examples, but the present invention is not limited to the Examples as long as the gist thereof is not exceeded.
• the film was evaluated based on the following measurement method. Unless otherwise specified, the measurement was carried out in a measurement room in an environment of 23 ° C. and 65% relative humidity.
• Film thickness Divide the film into 10 equal parts in the width direction (TD) of the film (for a narrow film, divide it so that the width that can measure the thickness can be secured), and divide the film into 10 pieces of 100 mm in the longitudinal direction.
• the film is cut out in layers and conditioned for 2 hours or more in an environment with a temperature of 23 ° C. and a relative humidity of 65%.
• the thickness at the center of each sample was measured with a thickness measuring device manufactured by Tester Sangyo, and the average value was taken as the thickness.
• the thickness of the base material layer (A layer), the easy-adhesive layer (B layer), and the easy-slip layer (C layer) is the total thickness of the laminated stretched polyamide film measured by the above method, and the base material layer measured at the time of film formation. It was calculated based on the ratio of the discharge amounts of each of the (A layer), the easy-adhesion layer (B layer), and the easy-slip layer (C layer).
• Pinhole resistance The number of pinholes was measured by the following method using a gelboflex tester BE1006 with a constant temperature bath manufactured by Tester Sangyo Co., Ltd. A polyester-based adhesive [a mixture of TM-569 (product name) and CAT-10L (product name) manufactured by Toyo Morton Co., Ltd. in a mass ratio of 7.2 / 1 (solid content concentration 23%)] was applied to the film. After coating so that the resin solid content after drying is 3.2 g / m 2 , a linear low-density polyethylene film (L-LDPE film: manufactured by Toyo Spinning Co., Ltd., Rix (registered trademark) L4102) 40 ⁇ m as a sealant film. Was dry-laminated and aged in an environment of 40 ° C. for 2 days to obtain a laminated film.
• L-LDPE film linear low-density polyethylene film
• the obtained dry laminate film was cut into a size of 28.0 cm ⁇ 24.0 cm, and the cut film was conditioned by leaving it at a temperature of 23 ° C. and a relative humidity of 50% for 6 hours or more. After that, the rectangular test film is wound to form a cylinder having a diameter of 8.9 cm. Then, one end of the cylindrical film is fixed to the outer circumference of the disk-shaped fixed head of the Gelboflex tester, and the other end of the cylindrical film is opposed to the fixed head at a distance of 19.4 cm from the disk-shaped movable head of the tester. Fixed on the outer circumference.
• the movable head is rotated 440 ° in the direction of the fixed head while approaching 7.6 cm along the axes of both heads facing each other in parallel, and subsequently, the movable head is rotated 6.4 cm straight without rotation, and then they are moved straight.
• a one-cycle bending test in which the movement was executed in the reverse direction to return the movable head to the initial position was continuously repeated for 1000 cycles at a speed of 40 cycles per minute. The implementation was carried out at 1 ° C. After that, the number of pinholes generated in the portion within 19.4 cm ⁇ 25.5 cm excluding the portion fixed to the outer periphery of the fixed head and the movable head of the tested film was measured (that is, the number of pinholes per 495 cm 2 was measured. Measured).
• Laminate strength A laminate film produced in the same manner as described in the description of pinhole resistance evaluation is cut into strips having a width of 15 mm and a length of 200 mm, and one end of the laminate film is lined with a biaxially stretched polyamide film. Peeled at the interface with the low-density polyethylene film, and used (manufactured by Shimadzu Corporation, Autograph) under the conditions of temperature 23 ° C, relative humidity 50%, tensile speed 200 mm / min, and peeling angle 90 °. The laminating strength of the strip-shaped laminating film was measured three times and evaluated by the average value.
• Example 1 Using a device consisting of one 60 mm caliber extruder for the A layer, two 25 mm caliber extruders for the B layer and C layer, and a 380 mm wide co-extruded T-die, polyamide as the base material layer (A layer). 6 (relative viscosity 2.8, melting point 220 ° C.) and polyamide 6/66 copolymer (polyamide 66 ratio 25% by mass, relative viscosity 2.8, melting point 198 ° C.) at a ratio of 70/30 by mass.
• polyamide 6 relative viscosity 2.8, melting point 220 ° C.
• polyamide 6/66 copolymer polyamide 66 ratio 25% by mass, relative viscosity 2.8, melting point 198 ° C.
• Polyamide 6 (relative viscosity 2.8, melting point 220 ° C.) and polyamide MXD6 are blended at a ratio of 95/5 by mass, and contains 0.54% by mass of silica fine particles and 0.15% by mass of ethylene bisstearic acid amide.
• the material added so as to be added is melt-extruded and laminated with a feed block into an easy-adhesion layer (B layer) / base material layer (A layer) / easy-slip layer (C layer) to form a sheet from a T die. It was extruded and brought into close contact with a cooling roll whose temperature was adjusted to 20 ° C. to obtain a 200 ⁇ m laminated unstretched sheet.
• the raw material used was dried so that the water content was 0.1% by mass before use. Further, as the silica fine particles, a pore volume of 1.6 ml / g and an average particle diameter of 3.9 ⁇ m were used.
• the obtained laminated unstretched sheet was guided to a roll-type stretching machine, stretched 1.7 times in the longitudinal direction at 70 ° C. using the difference in peripheral speeds of the rolls, and then further stretched 1.91 times at 70 ° C. (MD stretch ratio 3.25 times). Subsequently, this uniaxially stretched film was continuously led to a tenter type stretcher, preheated at 110 ° C., stretched 3.9 times at 130 ° C. in the width direction, heat-fixed at 210 ° C., and then at 210 ° C. A 5% relaxation treatment was carried out to obtain a laminated biaxially stretched polyamide film of 3 types and 3 layers laminated in the order of B layer / A layer / C layer.
• the total thickness of the laminated stretched polyamide film is 15 ⁇ m
• the thickness of the base material layer (A layer) is 12 ⁇ m
• the thicknesses of the front and back easy-adhesive layers (B layer) and easy-slip layer (C layer) are 1.
• the composition of the feed block and the discharge amount of the extruder were adjusted so as to be 5 ⁇ m each.
• Example 2 In the film forming method of Example 1 described above, a laminated biaxially stretched polyamide film was produced in the same manner as in Example 1 except that the resin ratio of each layer and the film forming conditions were changed to the conditions shown in Table 1.
• Example 7 Laminated biaxial as in Example 1 except that a polyamide 6/12 copolymer (7024B manufactured by Ube Industries, Ltd .: relative viscosity 2.6, melting point 201 ° C.) was used instead of the polyamide 6/66 copolymer. A stretched polyamide film was produced.
• a polyamide 6/12 copolymer 7024B manufactured by Ube Industries, Ltd .: relative viscosity 2.6, melting point 201 ° C.
• Example 8 to 12 In the film forming method of Example 7 described above, a laminated biaxially stretched polyamide film was produced in the same manner as in Example 1 except that the resin ratio of each layer and the film forming conditions were changed to the conditions shown in Table 1.
• the feed block is laminated on the surface layer (B layer) / base material layer (A layer) / surface layer (B layer), extruded into a sheet from the T die, and brought into close contact with a cooling roll whose temperature has been adjusted to 20 ° C.
• a 200 ⁇ m laminated unstretched sheet was obtained.
• the raw material used was dried so that the water content was 0.1% by mass before use. Further, as the silica fine particles, a pore volume of 1.6 ml / g and an average particle diameter of 3.9 ⁇ m were used.
• the obtained laminated unstretched sheet was formed into a film under the same conditions as in Example 1 to obtain a two-kind, three-layer laminated biaxially stretched polyamide film in which the B layer / A layer / B layer were laminated in this order.
• the material added so as to be contained is melt-extruded, laminated in a surface layer (C layer) / base material layer (A layer) / surface layer (C layer) configuration with a feed block, and extruded into a sheet from a T die.
• a 200 ⁇ m laminated unstretched sheet was obtained by adhering it to a cooling roll whose temperature was adjusted to ° C.
• the raw material used was dried so that the water content was 0.1% by mass before use. Further, as the silica fine particles, a pore volume of 1.6 ml / g and an average particle diameter of 3.9 ⁇ m were used.
• the obtained laminated unstretched sheet was formed into a film under the same conditions as in Example 1 to obtain a two-kind, three-layer laminated biaxially stretched polyamide film in which the C layer / A layer / C layer were laminated in this order.
• Tables 1 and 2 show the film forming conditions and the physical characteristics of the biaxially stretched polyamide films produced in Examples 1 to 12 and Comparative Examples 1 to 10.
• Comparative Example 1 since the content of the polyamide 6/66 copolymer in the base material layer (A layer) is small, the difference in the content of the polyamide 6/66 copolymer from the easy-adhesion layer (B layer) Since the adhesive strength between the layers is weak due to the large size, the lamination strength is lowered. Further, in Comparative Example 2, since the content of the polyamide 6/66 copolymer in the base material layer (A layer) was too large, the orientation due to stretching was weakened, and the tensile breaking strength was low.
• Comparative Example 3 since the content of the polyamide 6/66 copolymer in the easy-adhesion layer (B layer) was small, the adhesiveness between the sealant and the polyamide film was weak, and the lamination strength was weak.
• Comparative Example 4 since the draw ratio in the MD direction was low, the degree of surface orientation of the film was low, and the tensile breaking strength was low.
• Comparative Example 5 since the draw ratio in the MD direction was high, the degree of surface orientation was too high, and as a result, the adhesive strength between the B layer / A layer and the A layer / C layer was lowered, and the lamination strength was lowered.
• Comparative Example 6 since the heat fixing temperature was low, sufficient heat was not applied to improve the adhesiveness of the adhesive layer (B layer), so that the lamination strength was low. In addition, the heat shrinkage rate was high and the dimensional stability was poor.
• Comparative Example 7 since the heat fixing temperature was too high, the film became brittle and the tensile breaking strength decreased.
• Comparative Example 8 since the easy-slip layer (C layer) was not laminated, the friction coefficient was high and the slipperiness was insufficient. Further, since the ratio of the polyamide 6/66 copolymer in all the layers was increased, the orientation was difficult to be formed, and the tensile breaking strength was lowered.
• Comparative Example 9 since the surface layer did not contain the polyamide 6/66 copolymer, the water-resistant laminate strength was inferior. In Comparative Example 10, the adhesiveness could be improved by providing the coat layer, but the printability was inferior.
• the laminated stretched polyamide film of the present invention is excellent in heat resistance, impact resistance, pinhole resistance, and also excellent water resistance and adhesiveness (water resistance laminate strength). Therefore, it can be suitably used for applications of packaging materials such as liquid packaging.
• the laminated stretched polyamide film of the present invention can be applied to pickle bags, bags for large-sized water products for business use, and the like.

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• 2020
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