US20250198088A1 - Packaging material for aqueous content and packaging bag for aqueous content - Google Patents

Packaging material for aqueous content and packaging bag for aqueous content Download PDF

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Publication number
US20250198088A1
US20250198088A1 US18/846,425 US202318846425A US2025198088A1 US 20250198088 A1 US20250198088 A1 US 20250198088A1 US 202318846425 A US202318846425 A US 202318846425A US 2025198088 A1 US2025198088 A1 US 2025198088A1
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United States
Prior art keywords
layer
packaging material
thickness
vapor
anchor coat
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US18/846,425
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English (en)
Inventor
Rika ISHII
Junichi Kaminaga
Yoshiki Koshiyama
Yumiko KOJIMA
Hiroyuki Wakabayashi
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Toppan Holdings Inc
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Toppan Holdings Inc
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Assigned to TOPPAN HOLDINGS INC. reassignment TOPPAN HOLDINGS INC. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: ISHII, Rika, KOJIMA, Yumiko, KOSHIYAMA, YOSHIKI, KAMINAGA, JUNICHI, WAKABAYASHI, HIROYUKI
Publication of US20250198088A1 publication Critical patent/US20250198088A1/en
Pending legal-status Critical Current

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Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H27/00—Special paper not otherwise provided for, e.g. made by multi-step processes
    • D21H27/10—Packing paper
    • 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
    • B65D31/00—Bags or like containers made of paper and having structural provision for thickness of contents
    • 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
    • B65D65/42—Applications of coated or impregnated materials
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H19/00—Coated paper; Coating material
    • D21H19/02—Metal coatings
    • D21H19/08—Metal coatings applied as vapour, e.g. in vacuum
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H19/00—Coated paper; Coating material
    • D21H19/10—Coatings without pigments
    • D21H19/14—Coatings without pigments applied in a form other than the aqueous solution defined in group D21H19/12
    • D21H19/20—Coatings without pigments applied in a form other than the aqueous solution defined in group D21H19/12 comprising macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H19/00—Coated paper; Coating material
    • D21H19/10—Coatings without pigments
    • D21H19/14—Coatings without pigments applied in a form other than the aqueous solution defined in group D21H19/12
    • D21H19/20—Coatings without pigments applied in a form other than the aqueous solution defined in group D21H19/12 comprising macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
    • D21H19/22—Polyalkenes, e.g. polystyrene
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H19/00—Coated paper; Coating material
    • D21H19/36—Coatings with pigments
    • D21H19/38—Coatings with pigments characterised by the pigments
    • D21H19/385—Oxides, hydroxides or carbonates
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H19/00—Coated paper; Coating material
    • D21H19/36—Coatings with pigments
    • D21H19/38—Coatings with pigments characterised by the pigments
    • D21H19/40—Coatings with pigments characterised by the pigments siliceous, e.g. clays
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H19/00—Coated paper; Coating material
    • D21H19/36—Coatings with pigments
    • D21H19/44—Coatings with pigments characterised by the other ingredients, e.g. the binder or dispersing agent
    • D21H19/56—Macromolecular organic compounds or oligomers thereof obtained by reactions only involving carbon-to-carbon unsaturated bonds
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H19/00—Coated paper; Coating material
    • D21H19/36—Coatings with pigments
    • D21H19/44—Coatings with pigments characterised by the other ingredients, e.g. the binder or dispersing agent
    • D21H19/56—Macromolecular organic compounds or oligomers thereof obtained by reactions only involving carbon-to-carbon unsaturated bonds
    • D21H19/58—Polymers or oligomers of diolefins, aromatic vinyl monomers or unsaturated acids or derivatives thereof
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H19/00—Coated paper; Coating material
    • D21H19/80—Paper comprising more than one coating
    • D21H19/82—Paper comprising more than one coating superposed
    • 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
    • B65D31/00—Bags or like containers made of paper and having structural provision for thickness of contents
    • B65D31/02—Bags or like containers made of paper and having structural provision for thickness of contents with laminated walls

Definitions

  • the present disclosure relates to a packaging material for an aqueous content and a packaging bag for an aqueous content.
  • Patent Literature 1 discloses a gas barrier laminate having a barrier layer laminated on paper.
  • Paper has crease retention (also referred to as dead-holdability) and is thus easy to process.
  • crease retention also referred to as dead-holdability
  • the moisture barrier property is likely to deteriorate in the vicinity of the crease. Therefore, particularly in a case where a packaging bag accommodates an aqueous content, there is a demand for improvement in the moisture barrier property after bending.
  • One aspect of the present disclosure has been made in consideration of the above-described circumstance, and an objective of the present disclosure is to provide a packaging material and a packaging bag that have an excellent moisture barrier property even after being bent while reducing the amount of plastic materials used.
  • One aspect of the present disclosure is a packaging material including at least a gas barrier laminate having a paper base material, an anchor coat layer, a vapor-deposited layer and an overcoat layer laminated in this order, in which a mass of the paper base material is 50 mass % or more relative to a total mass of the gas barrier laminate, the vapor-deposited layer contains a metal or a metal oxide, the overcoat layer contains a polyolefin having a carboxylic acid base, and the overcoat layer has a thickness of more than 3 ⁇ m.
  • the anchor coat layer may contain a polyolefin having a carboxylic acid base.
  • a ratio of the thickness of the overcoat layer to a thickness of the anchor coat layer may be 1 to 20.
  • a sealant layer may be further provided on a side of the overcoat layer opposite to the vapor-deposited layer.
  • Another aspect of the present disclosure provides a packaging bag for an aqueous content obtained by making the packaging material for an aqueous content into a bag.
  • a packaging material and a packaging bag that have an excellent moisture barrier property even after being bent while reducing the amount of plastic materials used.
  • FIG. 1 is a schematic cross-sectional view showing a packaging material according to one embodiment of the present disclosure.
  • FIG. 2 is a schematic cross-sectional view showing a packaging material according to one embodiment of the present disclosure.
  • FIG. 3 is a perspective view showing a packaging bag according to one embodiment of the present disclosure.
  • FIG. 1 is a schematic cross-sectional view showing a packaging material according to one embodiment.
  • a packaging material 20 according to one embodiment is composed of a gas barrier laminate 10 having a paper base material 1 , an anchor coat layer 2 , a vapor-deposited layer 3 and an overcoat layer 4 laminated in this order.
  • the paper base material 1 is not particularly limited and is selected as appropriate depending on the use of a packaging bag to which the gas barrier laminate 10 is applied.
  • the paper base material 1 may be paper containing a plant-derived pulp as a main component. Specific examples of the paper base material 1 include high-quality paper, special-quality paper, coated paper, art paper, cast coated paper, vellum paper, kraft paper and glassine paper.
  • the thickness of the paper base material 1 may be, for example, 20 to 500 g/m 2 or 30 to 100 g/m 2 .
  • the thickness of the paper base material 1 may be, for example, 20 to 100 ⁇ m or 30 to 70 ⁇ m.
  • the paper base material 1 may be provided with a coat layer (not shown) on a side that comes into contact with the anchor coat layer 2 , which will be described below.
  • the coat layer provided on the side of the paper base material 1 that comes into contact with the anchor coat layer 2 makes it possible to prevent the anchor coat layer 2 from infiltrating into the paper base material 1 .
  • the coat layer plays a role of a filler that fills in the unevenness on the surface of the paper base material 1 , and it is possible to uniformly form the anchor coat layer 2 with no defects.
  • the coat layer may contain, for example, a variety of copolymers such as a styrene/butadiene-based copolymer, a styrene/acrylic copolymer and an ethylene/vinyl acetate-based copolymer; a polyvinyl alcohol-based resin, a cellulose-based resin, paraffin (wax) or the like as a binder resin and may contain clay, kaolin, calcium carbonate, tale, mica or the like as a filling material.
  • copolymers such as a styrene/butadiene-based copolymer, a styrene/acrylic copolymer and an ethylene/vinyl acetate-based copolymer
  • a polyvinyl alcohol-based resin such as a styrene/butadiene-based copolymer, a styrene/acrylic copolymer and an ethylene/vinyl acetate-
  • the thickness of the coat layer may be, for example, 1 to 10 ⁇ m or 3 to 8 ⁇ m.
  • the mass of the paper base material 1 is 50 mass % or more relative to the total mass of the packaging material 20 .
  • the mass of the paper base material 1 may be 60 mass % or more, 70 mass % or more or 75 mass % or more relative to the total mass of the packaging material 20 from the viewpoint of further reducing the amount of plastic materials used.
  • the anchor coat layer 2 is provided on a surface of the paper base material and is a layer provided for improvement in the adhesion between the paper base material 1 and the vapor-deposited layer 3 or improvement in the moisture barrier property of the gas barrier laminate 10 .
  • the anchor coat layer 2 may contain a polyolefin having a carboxylic acid base (a group obtained by substituting a hydrogen atom of a carboxyl group with a metal atom such as a sodium atom).
  • Such an anchor coat layer 2 has excellent flexibility, is capable of curbing the cracking of the vapor-deposited layer after being flexed (after being bent) and is capable of improving the adhesion between the anchor coat layer 2 and the vapor-deposited layer 3 .
  • the anchor coat layer 2 contains the polyolefin having a carboxylic acid base and thereby becomes a dense film due to the crystallinity of the polyolefin.
  • the anchor coat layer 2 contains the polyolefin having a carboxylic acid base and thereby makes the gas barrier property of the packaging material superior.
  • the polyolefin having a carboxylic acid base may be a salt of a copolymer of an olefin such as ethylene or propylene and an unsaturated carboxylic acid (an unsaturated compound having a carboxyl group such as acrylic acid, methacrylic acid or a maleic anhydride).
  • an unsaturated carboxylic acid an unsaturated compound having a carboxyl group such as acrylic acid, methacrylic acid or a maleic anhydride.
  • the salt include a sodium salt, a potassium salt and the like.
  • the anchor coat layer 2 may contain, in addition to the polyolefin having a carboxylic acid base, for example, a polyolefin other than the polyolefin having a carboxylic acid base, a silane coupling agent, an organic titanate, polyacrylic, polyester, polyurethane, polycarbonate, polyurea, polyamide, polyimide, melamine, phenol or the like.
  • the content of the polyolefin having a carboxylic acid base in the anchor coat layer 2 may be 50 mass % or more, 60 mass % or more, 70 mass % or more, 80 mass % or more, 90 mass % or more, 95 mass % or more or 100 mass % relative to the total mass of the anchor coat layer 2 from the viewpoint of the superior moisture barrier property of the packaging material.
  • the thickness of the anchor coat layer 2 may be, for example, 1 ⁇ m or more or 2 ⁇ m or more and may be 20 ⁇ m or less, 10 ⁇ m or less or 5 ⁇ m or less.
  • the thickness of the anchor coat layer 2 is 1 ⁇ m or more, it is easy to fill the unevenness on the surface of the paper base material 1 , and it is possible to uniformly laminate the vapor-deposited layer 3 .
  • the thickness of the anchor coat layer 2 is 20 ⁇ m or less, the thickness of the anchor coat layer 2 does not become too thick, it is less likely for cracks to be generated in the vapor-deposited layer on the anchor coat layer 2 due to flexing, and the moisture barrier property is less likely to deteriorate after the packaging material is bent.
  • the water resistance after the bending of the packaging material is excellent, and it is possible to uniformly laminate the vapor-deposited layer 3 while curbing the cost. Furthermore, when the thickness of the anchor coat layer is 20 ⁇ m or less, the amount of a coating liquid that is used to form the anchor coat layer 2 applied to the paper base material is prevented from becoming too large. Therefore, the coating suitability is excellent, and disadvantages such as the deterioration of the flatness of the coated surface and the generation of wrinkles on the base material can be curbed.
  • Examples of a solvent that is contained in the coating liquid of the anchor coat layer 2 include water, methyl alcohol, ethyl alcohol, isopropyl alcohol, n-propyl alcohol, n-butyl alcohol, n-pentyl alcohol, dimethyl sulfoxide, dimethylformamide, dimethylacetamide, toluene, hexane, heptane, cyclohexane, acetone, methyl ethyl ketone, diethyl ether, dioxane, tetrahydrofuran, ethyl acetate and butyl acetate.
  • One of these solvents may be used singly or two or more thereof may be jointly used.
  • the solvent that is contained in the coating liquid of the anchor coat layer 2 may contain at least one selected from the group consisting of methyl alcohol, ethyl alcohol, isopropyl alcohol, toluene, ethyl acetate, methyl ethyl ketone and water from the viewpoint of the features.
  • the solvent that is contained in the coating liquid of the anchor coat layer 2 may contain at least one selected from the group consisting of methyl alcohol, ethyl alcohol, isopropyl alcohol and water from the viewpoint of reducing the environmental load.
  • the anchor coat layer 2 can be laminated on the paper base material 1 by, for example, applying and drying the coating liquid containing the polyolefin having a carboxylic acid base and the solvent to and on the paper base material 1 .
  • the average particle diameter of the polyolefin having a carboxylic acid base in the coating liquid may be 1 ⁇ m or less, 0.7 ⁇ m or less or 0.5 ⁇ m or less from the viewpoint of making the dried coated surface flat, uniformly laminating the vapor-deposited layer 3 and improving the barrier property.
  • the vapor-deposited layer 3 is a layer obtained by vapor-depositing a metal or a metal oxide.
  • the vapor-deposited layer 3 may be a layer obtained by vapor-depositing aluminum or may contain aluminum oxide (AlO x ), silicon oxide (SiO x ) or the like.
  • the vapor-deposited layer 3 present between the anchor coat layer 2 and the overcoat layer 4 makes it possible to obtain a packaging material having a superior moisture barrier property.
  • the vapor-deposited layer 3 is a dense film compared with resin layers, and in a state where pin holes are excluded, the intervals between atoms are smaller than water molecules. Therefore, when the packaging material 20 has the vapor-deposited layer 3 , the packaging material 20 is excellent in term of not only the resistance to water, which is a liquid, (moisture barrier property) but also the resistance to water vapor (gas barrier property).
  • the thickness of the vapor-deposited layer 3 may be, for example, 10 to 300 nm or 30 to 100 nm. When the thickness of the vapor-deposited layer 3 is 10 nm or more, it becomes easy to uniformly form the vapor-deposited layer 3 . When the thickness of the vapor-deposited layer 3 is 300 nm or less, it is possible to sufficiently curb the curling of the vapor-deposited layer 3 and the generation of cracks in the vapor-deposited layer 3 , and the vapor-deposited layer 3 is likely to have a sufficient gas barrier property and sufficient flexibility.
  • the vapor-deposited layer 3 can be formed by a vacuum vapor deposition method, a sputtering method, a chemical vapor deposition method (CVD method) or the like.
  • the vapor-deposited layer 3 is preferably formed by vacuum film formation means from the viewpoint of the gas barrier property and the uniformity of the film.
  • the vapor-deposited layer 3 may be a vacuum vapor deposition method since the film formation rate is fast and the productivity is high.
  • film formation means by electron beam heating is preferable since the firm formation rate is easily controlled by the irradiation area, the electron beam current or the like and the temperature of a vapor deposition material can be increased and decreased within a short period of time.
  • the polyolefin having a carboxylic acid base that is contained in the overcoat layer 4 may be different from the polyolefin having a carboxylic acid base that is contained in the anchor coat layer 2 or may be the same as that from the viewpoint of ease of manufacturing.
  • the content of the polyolefin having a carboxylic acid base in the overcoat layer 4 may be 50 mass % or more, 60 mass % or more, 70 mass % or more, 80 mass % or more, 90 mass % or more, 95 mass % or more or 100 mass % relative to the total mass of the overcoat layer 4 from the viewpoint of the superior moisture barrier property of the packaging material.
  • Examples of a solvent that is contained in a coating liquid of the overcoat layer 4 include water, methyl alcohol, ethyl alcohol, isopropyl alcohol, n-propyl alcohol, n-butyl alcohol, n-pentyl alcohol, dimethyl sulfoxide, dimethylformamide, dimethylacetamide, toluene, hexane, heptane, cyclohexane, acetone, methyl ethyl ketone, diethyl ether, dioxane, tetrahydrofuran, ethyl acetate and butyl acetate.
  • One of these solvents may be used singly or two or more thereof may be jointly used.
  • the ratio of the thickness of the overcoat layer 4 to the thickness of the anchor coat layer 2 may be 1 or more, 1.5 or more or 1.8 or more from the viewpoint of the flexing resistance.
  • the ratio of the thickness of the overcoat layer 4 to the thickness of the anchor coat layer 2 may be 30 or less, 25 or less, 20 or less, 15 or less, 10 or less, 8 or less, 6 or less, 5 or less or 4 or less from the viewpoint of the coatability and the recyclability.
  • the total thickness of the anchor coat layer 2 and the overcoat layer 4 is preferably 50 ⁇ m or less, 40 ⁇ m or less, 30 ⁇ m or less, 25 ⁇ m or less, 21 ⁇ m or less, 20 ⁇ m or less, 18 ⁇ m or less, 15 ⁇ m or less or 12 ⁇ m or less from the viewpoint of making the recyclability superior by decreasing the amount of a resin material used relative to the paper base material.
  • FIG. 2 is a schematic cross-sectional view showing a packaging material according to another embodiment.
  • a packaging material 30 shown in FIG. 2 includes the gas barrier laminate 10 and a sealant layer 21 that is laminated on the gas barrier laminate 10 , and the overcoat layer 4 of the gas barrier laminate 10 and the sealant layer 21 are in contact with each other through an adhesive layer 22 .
  • the packaging material 30 includes the sealant layer 21 on a side of the overcoat layer 4 opposite to the vapor-deposited layer 3 .
  • the material of the sealant layer 21 may be a polyolefin to make the packaging material 30 a mono-material packaging material.
  • the material of the sealant layer 21 may be polypropylene like a base material layer of the packaging material.
  • the sealant layer 21 may be, for example, a stretched or unstretched polypropylene film.
  • the thickness of the sealant layer 21 may be, for example, 15 ⁇ m or more and may be 200 ⁇ m or less or 100 ⁇ m or less.
  • the adhesive layer 22 makes the gas barrier laminate 10 and the sealant layer 21 adhere to each other.
  • an adhesive that configures the adhesive layer 22 include polyurethane resins obtained by making a bi- or higher-functional isocyanate compound act on a main agent such as polyester polyol, polyether polyol, acrylic polyol or carbonate polyol and the like.
  • a main agent such as polyester polyol, polyether polyol, acrylic polyol or carbonate polyol and the like.
  • One of a variety of polyols may be used singly or two or more thereof may be jointly used.
  • the adhesive layer 22 may be obtained by blending a carbodiimide compound, an oxazoline compound, an epoxy compound, a phosphorus compound, a silane coupling agent or the like with the above-described polyurethane resin for the purpose of adhesion promotion.
  • the thickness of the adhesive layer may be, for example, 0.5 to 10 g/m 2 from the viewpoint of obtaining desired adhesive strength, followability, workability and the like.
  • a biomass-derived polymer or a biodegradable polymer may be used as a polymer component from the viewpoint of environmental consideration.
  • an adhesive having a barrier property may be used in the adhesive layer 22 .
  • the Cobb 300 value (initial) of the packaging material may be 0.3 g/m 2 or less, 0.2 g/m 2 or less or 0.1 g/m 2 or less from the viewpoint of an excellent moisture barrier property.
  • the Cobb 300 value (initial) means a Cobb 300 value measured at a portion other than the bent portions of the packaging material and is measured by a method to be described in the following examples.
  • FIG. 3 is a perspective view showing a gusset bag 40 composed of the gas barrier laminate 10 (packaging material 20 ).
  • a packaging bag is manufactured by sealing an opening portion in the upper part of the gusset bag 40 .
  • the gusset bag 40 has places where the gas barrier laminate 10 has been bent (bent portions B1 and B2).
  • the bent portions B1 are places where the gas barrier laminate 10 has been valley-folded when seen from the innermost layer side
  • the bent portions B2 are places where the gas barrier laminate 10 has been mountain-folded when seen from the innermost layer side.
  • the packaging bag may be provided with a bag shape by folding one gas barrier laminate in half so that the overcoat layer 4 faces each other, then, appropriately bending the gas barrier laminate into a desired shape and heat-sealing the gas barrier laminate or may be provided with a bag shape by overlapping two gas barrier laminates so that the overcoat layers 4 face each other and then heat-sealing the gas barrier laminates.
  • the packaging bag accommodates an aqueous content.
  • the aqueous content means a content containing at least water.
  • the packaging bag according to the present embodiment has an excellent moisture barrier property while having a shape with the bent portions and is capable of sufficiently curbing the seeping of the aqueous content.
  • the gusset bag had been described as one example of the packaging bag; however, for example, a pillow bag, a three-side seal bag or a standing pouch may be produced using the packaging material according to the present embodiment.
  • the present disclosure includes, for example, the following [1] to [5].
  • a packaging material for an aqueous content including at least a gas barrier laminate having a paper base material, an anchor coat layer, a vapor-deposited layer and an overcoat layer laminated in this order, in which
  • the packaging material for an aqueous content according to any one of [1] to [3], further including a sealant layer provided on a side of the overcoat layer opposite to the vapor-deposited layer.
  • a packaging bag for an aqueous content obtained by making the packaging material for an aqueous content according to any one of [1] to [4] into a bag.
  • a coating liquid containing a polyolefin having a carboxylic acid base (trade name: CHEMIPEARL S100, ionomer-based, average particle diameter: ⁇ 0.1 ⁇ m, solvent: water and IPA, manufactured by Mitsui Chemicals, Inc.) was applied onto a surface of a paper base material (coated paper, thickness of paper: 55 ⁇ m, 60 g/m 2 , thickness of clay coated layer: 5 ⁇ m) on the clay coated layer side with a bar coater and dried in an oven, thereby forming an anchor coat layer.
  • the thickness of the anchor coat layer was 2 ⁇ m.
  • AL vapor deposition was performed on the anchor coat layer by a vacuum vapor deposition method to form a vapor-deposited layer.
  • the thickness of the vapor-deposited layer was 50 ⁇ m.
  • a solution containing a polyolefin having a carboxylic acid base (trade name: CHEMIPEARL S100, ionomer-based, average particle diameter: less than 0.1 ⁇ m, solvent: water and IPA, manufactured by Mitsui Chemicals, Inc.) was applied onto the vapor-deposited layer with the bar coater and dried in the oven to form an overcoat layer, thereby obtaining a gas packaging material.
  • the thickness of the overcoat layer was 5 ⁇ m.
  • the content of the paper base material in the packaging material was 82 mass %.
  • a packaging material was obtained by the same operation as in Example 1 except that the thickness of the anchor coat layer was set to 3 ⁇ m and the thickness of the overcoat layer was set to 12 ⁇ m.
  • the content of the paper base material in the packaging material was 73 mass %.
  • a packaging material was obtained by the same operation as in Example 1 except that the thickness of the overcoat layer was set to 3.5 ⁇ m.
  • the content of the paper base material in the packaging material was 84 mass %.
  • Sodium polyacrylate was added as a dispersant to a pigment (engineered kaolin, Imerys S.A., BARRISURF HX, average particle diameter: 9.0 ⁇ m, aspect ratio: 80 to 100) (0.2% relative to the pigment) and dispersed with the Serie mixer to prepare a kaolin slurry having a solid content concentration of 55%.
  • a polyvinyl alcohol (manufactured by Kuraray Co., Ltd., PVA117) aqueous solution was prepared so that the solid content concentration reached 10%, and a PVA aqueous solution was obtained.
  • the coating liquid for forming an anchor coat layer was applied to a single surface of paper base paper (kraft paper, thickness of paper: 55 g/m 2 ) using a blade coater so that the coating amount reached 12 g/m 2 (thickness of anchor coat layer: 12 ⁇ m) in terms of the dry mass and dried, and the coating liquid for forming an overcoat layer was then applied onto a single surface of the dried coating liquid for forming an anchor coat layer using a roll coater so that the coating amount reached 3.0 g/m 2 (thickness of overcoat layer: 3 ⁇ m) in terms of the dry mass and dried, thereby obtaining a packaging material.
  • the content of the paper base material in the packaging material was 79 mass %.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Dispersion Chemistry (AREA)
  • Wrappers (AREA)
  • Laminated Bodies (AREA)
US18/846,425 2022-03-17 2023-02-28 Packaging material for aqueous content and packaging bag for aqueous content Pending US20250198088A1 (en)

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PCT/JP2023/007358 WO2023176432A1 (ja) 2022-03-17 2023-02-28 水系内容物用包装材及び水系内容物用包装袋

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JP7588264B1 (ja) * 2023-12-20 2024-11-21 サカタインクス株式会社 耐折曲剤および積層体
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JPS5662147A (en) * 1979-10-26 1981-05-27 Toyo Ink Mfg Co Packing material
JP2000037831A (ja) * 1998-07-24 2000-02-08 Nippon Polyolefin Kk ガスバリヤー性紙容器
RU2533128C2 (ru) * 2009-07-08 2014-11-20 Тетра Лаваль Холдингз Энд Файнэнс С.А. Высокобарьерный упаковочный ламинированный материал, способ изготовления упаковочного ламинированного материала и упаковочный контейнер
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EP3517291B1 (en) * 2018-01-24 2023-07-26 Tetra Laval Holdings & Finance S.A. Barrier film and laminated packaging material comprising the film and packaging container made therefrom
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JP6668576B1 (ja) 2018-10-26 2020-03-18 王子ホールディングス株式会社 ガスバリア性積層体
KR102582556B1 (ko) * 2019-03-01 2023-09-26 미츠이·다우 폴리케미칼 가부시키가이샤 적층체 및 포장 용기
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