WO2023176432A1 - 水系内容物用包装材及び水系内容物用包装袋 - Google Patents

水系内容物用包装材及び水系内容物用包装袋 Download PDF

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Publication number
WO2023176432A1
WO2023176432A1 PCT/JP2023/007358 JP2023007358W WO2023176432A1 WO 2023176432 A1 WO2023176432 A1 WO 2023176432A1 JP 2023007358 W JP2023007358 W JP 2023007358W WO 2023176432 A1 WO2023176432 A1 WO 2023176432A1
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WO
WIPO (PCT)
Prior art keywords
layer
packaging material
mass
thickness
anchor coat
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2023/007358
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English (en)
French (fr)
Japanese (ja)
Inventor
里佳 石井
純一 神永
良樹 越山
裕美子 小島
寛之 若林
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Toppan Inc
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Toppan Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Toppan Inc filed Critical Toppan Inc
Priority to JP2024507696A priority Critical patent/JPWO2023176432A1/ja
Priority to AU2023235611A priority patent/AU2023235611A1/en
Priority to EP23770390.5A priority patent/EP4480699A4/en
Priority to US18/846,425 priority patent/US20250198088A1/en
Publication of WO2023176432A1 publication Critical patent/WO2023176432A1/ja
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • 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
    • 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
    • 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
    • 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 aqueous contents and a packaging bag for aqueous contents.
  • Patent Document 1 listed below discloses a gas barrier laminate in which a barrier layer is laminated on paper.
  • Paper has the characteristic of being easy to process because it has crease retention properties (also referred to as dead-hold properties).
  • crease retention properties also referred to as dead-hold properties.
  • packaging bags with creases tend to have poor moisture barrier properties near the creases. Therefore, especially when packaging bags contain aqueous contents, there is a demand for improved moisture barrier properties after folding.
  • One aspect of the present disclosure has been made in view of the above circumstances, and provides a packaging material and packaging bag that reduces the amount of plastic material used and has excellent moisture barrier properties even after being folded.
  • the purpose is to
  • One aspect of the present disclosure is a packaging material including at least a gas barrier laminate in which a paper base material, an anchor coat layer, a vapor deposition layer, and an overcoat layer are laminated in this order, is 50% by mass or more based on the 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 group, and the thickness of the overcoat layer Provided is a packaging material for aqueous contents having a diameter of more than 3 ⁇ m.
  • the anchor coat layer may contain a polyolefin having a carboxylic acid group.
  • the ratio of the thickness of the overcoat layer to the thickness of the anchor coat may be 1 to 20.
  • the above packaging material for water-based contents may further include a sealant layer on the side of the overcoat layer opposite to the vapor deposited layer.
  • Another aspect of the present disclosure provides a packaging bag for aqueous contents formed by bag-making the above-mentioned packaging material for aqueous contents.
  • a packaging material and a packaging bag that have excellent moisture barrier properties even after being folded, while reducing the amount of plastic material used.
  • FIG. 1 is a schematic cross-sectional view showing a packaging material according to an embodiment of the present disclosure.
  • FIG. 1 is a schematic cross-sectional view showing a packaging material according to an embodiment of the present disclosure.
  • FIG. 1 is a perspective view showing a packaging bag according to an embodiment of the present disclosure.
  • FIG. 1 is a schematic cross-sectional view showing a packaging material according to one embodiment.
  • the packaging material 20 includes a gas barrier laminate 10 in which a paper base material 1, an anchor coat layer 2, a vapor deposition layer 3, and an overcoat layer 4 are laminated in this order.
  • the paper base material 1 is not particularly limited, and is appropriately selected depending on the use of the packaging bag to which the gas barrier laminate 10 is applied.
  • the paper base material 1 may be paper whose main component is pulp derived from plants. Specific examples of the paper base material 1 include wood-free paper, special wood-free paper, coated paper, art paper, cast-coated paper, imitation paper and 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 the side in contact with the anchor coat layer 2 described below.
  • a coat layer (not shown) on the side in contact with the anchor coat layer 2 described below.
  • the coat layer plays the role of filling in the unevenness of the surface of the paper base material 1, and the anchor coat layer 2 is uniformly formed without defects. It can be formed into a film.
  • the coating layer includes, for example, various copolymers such as styrene/butadiene, styrene/acrylic, and ethylene/vinyl acetate as binder resin; polyvinyl alcohol resin, cellulose resin, paraffin (WAX), etc. Clay, kaolin, calcium carbonate, talc, mica, etc. may be included as fillers.
  • the thickness of the coating layer may be, for example, 1 to 10 ⁇ m or 3 to 8 ⁇ m.
  • the mass of the paper base material 1 is 50% by mass or more with respect to the total mass of the packaging material 20. If the mass of the paper base material 1 is 50 mass% or more with respect to the total mass of the packaging material 20, the amount of plastic material used can be sufficiently reduced. Such packaging material 20 has excellent recyclability.
  • the mass of the paper base material 1 may be 60 mass% or more, 70 mass% or more, or 75 mass% or more with respect to the total mass of the packaging material 20, from the viewpoint of further reducing the amount of plastic material used. .
  • the anchor coat layer 2 is a layer provided on the surface of the paper base material to improve the adhesion between the paper base material 1 and the vapor deposition layer 3 and to improve the moisture barrier properties of the gas barrier laminate 10. be.
  • the anchor coat layer 2 may contain a polyolefin having a carboxylic acid group (a group in which a hydrogen atom of a carboxyl group is substituted with a metal atom such as a sodium atom).
  • Such an anchor coat layer 2 has excellent flexibility and can suppress cracking of the vapor deposited layer after bending (bending), and can improve the adhesion between the anchor coat layer 2 and the vapor deposited layer 3. can.
  • the anchor coat layer 2 contains a polyolefin having a carboxylic acid group, and becomes a dense film due to the crystallinity of the polyolefin. Further, since the anchor coat layer 2 contains a polyolefin having a carboxylic acid group, the moisture barrier properties of the packaging material are further improved.
  • a polyolefin having a carboxylic acid group is 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 maleic anhydride). good.
  • the salt include sodium salt, potassium salt, and the like.
  • the anchor coat layer 2 includes, for example, a polyolefin other than the polyolefin having a carboxylic acid group, a silane coupling agent, an organic titanate, a polyacrylic, a polyester, a polyurethane, a polycarbonate, a polyurea, a polyamide, a polyimide. , melamine, phenol, etc.
  • the content of the polyolefin having a carboxylic acid group in the anchor coat layer 2 is 50% by mass or more, 60% by mass or more, 70% by mass or more based on the total mass of the anchor coat layer 2, from the viewpoint of improving the moisture barrier properties of the packaging material. It may be at least 80% by mass, at least 90% by mass, at least 95% by mass, or at least 100% by mass.
  • the thickness of the anchor coat layer 2 may be, for example, 1 ⁇ m or more, or 2 ⁇ m or more, or 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, unevenness on the surface of the paper base material 1 can be easily filled, and the vapor deposition layer 3 can be uniformly laminated.
  • 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, and the vapor deposited layer on the anchor coat layer 2 is less likely to crack due to bending.
  • the moisture barrier property is less likely to deteriorate after bending, it is possible to have excellent water resistance after bending and to uniformly stack the vapor deposited layer 3 while keeping costs down. Furthermore, since the thickness of the anchor coat layer is 20 ⁇ m or less, it prevents the coating amount of the coating liquid that forms the anchor coat layer 2 from becoming too large on the paper base material, resulting in excellent coating suitability. Problems such as deterioration of smoothness and generation of wrinkles on the base material can be suppressed. In addition, since the deterioration of the smoothness of the coated surface can be suppressed, the barrier properties may be lowered due to the vapor deposited layer 3 not being stacked uniformly, and the vapor deposited layer may become non-uniform. It is possible to suppress the occurrence of cracks, and the deterioration of the barrier properties after bending due to the generation of cracks.
  • Examples of the solvent contained in the coating liquid for anchor coat layer 2 include water, methyl alcohol, ethyl alcohol, isopropyl alcohol, n-propyl alcohol, n-butyl alcohol, n-pentyl alcohol, dimethyl sulfoxide, dimethylformamide, and dimethylacetamide. , toluene, hexane, heptane, cyclohexane, acetone, methyl ethyl ketone, diethyl ether, dioxane, tetrahydrofuran, ethyl acetate, and butyl acetate. These solvents may be used alone or in combination of two or more.
  • the solvent contained in the coating liquid of the anchor coat layer 2 contains at least one selected from the group consisting of methyl alcohol, ethyl alcohol, isopropyl alcohol, toluene, ethyl acetate, methyl ethyl ketone, and water. Good too.
  • the solvent 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 load on the environment.
  • the anchor coat layer 2 can be laminated on the paper base material 1 by, for example, applying a coating liquid containing a polyolefin having a carboxylic acid group and a solvent onto the paper base material 1 and drying it.
  • the average particle size of the polyolefin having a carboxylic acid group in the coating solution is 1 ⁇ m or less, 0.7 ⁇ m or less, from the viewpoint of smoothing the coated surface after drying, uniformly laminating the vapor deposited layer 3, and improving barrier properties. Alternatively, it may be 0.5 ⁇ m or less.
  • the vapor deposited layer 3 is a layer in which metal or metal oxide is vapor deposited.
  • the vapor deposited layer 3 may be a layer in which aluminum is vapor deposited, or may contain aluminum oxide (AlO x ), silicon oxide (SiO x ), or the like.
  • the packaging material 20 has the vapor deposited layer 3, the packaging material 20 has excellent resistance not only to liquid water (moisture barrier properties) but also to water vapor (gas barrier properties).
  • 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 deposition layer 3 is 10 nm or more, the vapor deposition layer 3 can be easily formed uniformly. When the thickness of the vapor deposited layer 3 is 300 nm or less, curling of the vapor deposited layer 3 and generation of cracks in the vapor deposited layer 3 can be sufficiently suppressed, and the vapor deposited layer 3 has sufficient gas barrier performance and flexibility. easy to have.
  • the vapor deposition layer 3 can be formed by a vacuum evaporation method, a sputtering method, a chemical vapor deposition method (CVD method), or the like.
  • the vapor deposition layer 3 is preferably formed by vacuum film formation from the viewpoint of gas barrier properties and film uniformity.
  • the vapor deposition layer 3 may be formed by vacuum vapor deposition because the film formation rate is fast and productivity is high.
  • vacuum evaporation methods film formation by electron beam heating is preferable because the film formation rate can be easily controlled by the irradiation area, electron beam current, etc., and the temperature of the evaporation material can be raised and lowered in a short time.
  • the overcoat layer 4 is a layer provided on the surface of the vapor deposition layer 3 so as to be in contact with the vapor deposition layer 3, and contains a polyolefin having a carboxylic acid group. Since the overcoat layer 4 contains a polyolefin having a carboxylic acid group, the packaging material 20 has excellent moisture barrier properties even after being folded. Examples of the polyolefin having a carboxylic acid group include the polyolefin having a carboxylic acid group contained in the anchor coat layer 2 described above. The polyolefin having a carboxylic acid group contained in the overcoat layer 4 may be different from the polyolefin having a carboxylic acid group contained in the anchor coat layer 2, or may be the same from the viewpoint of ease of manufacture.
  • the overcoat layer 4 contains polyolefin having a carboxylic acid group, it has excellent flexibility and can suppress cracking of the vapor deposited layer 3 after bending (after bending). It is possible to improve the adhesion with. Since the overcoat layer 4 contains polyolefin having a carboxylic acid group, it becomes a dense film due to the crystallinity of the polyolefin. Further, since the overcoat layer 4 contains polyolefin having a carboxylic acid group, it can also serve as a heat-sealing layer, so that bags can be manufactured without providing a heat-sealing layer.
  • the overcoat layer 4 contains, for example, a coupling agent such as a silane coupling agent; polyacrylic, polyester, polyurethane, polycarbonate, polyurea, polyamide, polyolefin emulsion, polyimide, melamine, It may contain resin such as phenol; organic titanate, etc.
  • a coupling agent such as a silane coupling agent
  • the content of the polyolefin having a carboxylic acid group in the overcoat layer 4 is 50% by mass or more, 60% by mass or more, 70% by mass or more based on the total mass of the overcoat layer 4, from the viewpoint of improving the moisture barrier properties of the packaging material. It may be at least 80% by mass, at least 90% by mass, at least 95% by mass, or at least 100% by mass.
  • the thickness of the overcoat layer 4 is over 3 ⁇ m. Since the thickness of the overcoat layer 4 is more than 3 ⁇ m, the packaging material 20 has excellent moisture barrier properties even after being folded.
  • the thickness of the overcoat layer 4 may be 3.5 ⁇ m or more, 4 ⁇ m or more, 4.5 ⁇ m or more, or 5 ⁇ m or more. As the thickness of the overcoat layer 4 becomes thicker, the proportion of the paper base material decreases, and thus the recyclability decreases. Therefore, the thickness of the overcoat layer 4 is 20 ⁇ m or less, less than 20 ⁇ m, from the viewpoint of maintaining recyclability, suppressing costs, having excellent adhesion with the vapor deposited layer 3, and fully exhibiting moisture barrier properties.
  • the thickness of the overcoat layer 4 may be 10 ⁇ m or less, 8 ⁇ m or less, 6 ⁇ m or less, or 5 ⁇ m or less.
  • Examples of the solvent contained in the coating liquid for overcoat layer 4 include water, methyl alcohol, ethyl alcohol, isopropyl alcohol, n-propyl alcohol, n-butyl alcohol, n-pentyl alcohol, dimethyl sulfoxide, dimethylformamide, and dimethylacetamide. , toluene, hexane, heptane, cyclohexane, acetone, methyl ethyl ketone, diethyl ether, dioxane, tetrahydrofuran, ethyl acetate, and butyl acetate. These solvents may be used alone or in combination of two or more.
  • the solvent contained in the coating liquid of the anchor coat layer 2 contains at least one selected from the group consisting of methyl alcohol, ethyl alcohol, isopropyl alcohol, toluene, ethyl acetate, methyl ethyl ketone, and water. Good too.
  • the solvent 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 load on the environment.
  • the overcoat layer 4 can be laminated on the vapor deposited layer 3 by, for example, applying a coating liquid containing a polyolefin having a carboxylic acid group and a solvent onto the vapor deposited layer 3 and drying the coating liquid.
  • the average particle size of the polyolefin having a carboxylic acid group in the coating liquid is 1 ⁇ m or less, 0.7 ⁇ m or less, or 0.7 ⁇ m or less, from the viewpoint of increasing the rising temperature during heat sealing and preventing blocking during transportation of the packaging material. It may be 5 ⁇ m or less.
  • the ratio of the thickness of overcoat layer 4 to the thickness of anchor coat layer 2 is 1 or more and 1.5 or more from the viewpoint of bending resistance. , or 1.8 or more. From the viewpoint of coatability and recyclability, the ratio of the thickness of the overcoat layer 4 to the thickness of the anchor coat layer 2 is 30 or less, 25 or less, 20 or less, 15 or less, 10 or less, 8 or less, 6 or less, It may be 5 or less, or 4 or less.
  • the total thickness of the anchor coat layer 2 and overcoat layer 4 is 50 ⁇ m or less, 40 ⁇ m or less, 30 ⁇ m or less, 25 ⁇ m or less, It is preferably 21 ⁇ m or less, 20 ⁇ m or less, 18 ⁇ m or less, 15 ⁇ m or less, or 12 ⁇ m or less.
  • FIG. 2 is a schematic cross-sectional view showing a packaging material according to another embodiment.
  • the packaging material 30 shown in FIG. 2 includes a gas barrier laminate 10 and a sealant layer 21 laminated on the gas barrier laminate 10, and the overcoat layer 4 of the gas barrier laminate 10 and the sealant layer 21 are bonded together as an adhesive layer It is bonded via 22.
  • the packaging material 30 includes the sealant layer 21 on the side of the overcoat layer 4 opposite to the vapor deposited layer 3.
  • the material of the sealant layer 21 may be polyolefin.
  • the material of the sealant layer 21 may be polypropylene similarly to the 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, 200 ⁇ m or less, or 100 ⁇ m or less.
  • the adhesive layer 22 is for bonding the gas barrier laminate 10 and the sealant layer 21 together.
  • the adhesive constituting the adhesive layer 22 include polyurethane resins in which a difunctional or higher-functional isocyanate compound is applied to a base material such as polyester polyol, polyether polyol, acrylic polyol, or carbonate polyol.
  • a base material such as polyester polyol, polyether polyol, acrylic polyol, or carbonate polyol.
  • Various polyols may be used alone or in combination of two or more.
  • a carbodiimide compound, an oxazoline compound, an epoxy compound, a phosphorus compound, a silane coupling agent, etc. may be blended with the above-mentioned polyurethane resin for the purpose of promoting adhesion.
  • 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, trackability, processability, etc.
  • a material whose polymer component is derived from biomass or a material having biodegradability may be used.
  • an adhesive having barrier properties may be used for the adhesive layer 22.
  • the Cobb300 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 excellent moisture barrier properties.
  • the Cobb300 value (initial) means the Cobb300 value measured at a portion other than the folded portion of the packaging material, and is measured by the method described in the Examples below.
  • FIG. 3 is a perspective view showing a gusset bag 40 made of the gas barrier laminate 10 (packaging material 20).
  • a packaging bag is manufactured by sealing the upper opening of the gusset bag 40.
  • the gusset bag 40 has portions where the gas barrier laminate 10 is bent (bent portions B1 and B2).
  • the folded portion B1 is a portion where the gas barrier laminate 10 is valley-folded when viewed from the innermost layer side
  • the bent portion B2 is a portion where the gas barrier laminate 10 is mountain-folded when viewed from the innermost layer side.
  • the packaging bag may be formed into a bag shape by folding one gas barrier laminate in half so that the overcoat layer 4 faces each other, then bending it appropriately to obtain the desired shape, and heat-sealing it.
  • two gas barrier laminates may be stacked so that the overcoat layer 4 faces each other, and then heat-sealed to form a bag shape.
  • the packaging bag contains aqueous contents.
  • the aqueous content means a content containing at least water.
  • the packaging bag according to the present embodiment has excellent moisture barrier properties even if it has a bent portion, and can sufficiently suppress the aqueous contents from seeping out.
  • a gusset bag is cited as an example of a packaging bag, but the packaging material according to this embodiment may be used to produce, for example, a pillow bag, a three-sided seal bag, or a standing pouch.
  • a packaging material comprising at least a gas barrier laminate in which a paper base material, an anchor coat layer, a vapor deposition layer, and an overcoat layer are laminated in this order,
  • the mass of the paper base material is 50% by mass or more with respect to the total mass of the packaging material
  • the vapor deposited layer contains a metal or a metal oxide
  • the overcoat layer contains a polyolefin having a carboxylic acid group
  • Example 1 A coating liquid containing a polyolefin having a carboxylic acid group (product Chemipearl S100, ionomer system, average particle size: ⁇ 0.1 ⁇ m, solvent: water, IPA, manufactured by Mitsui Chemicals) was coated with a bar coater and dried in an oven to form an anchor coat layer. The thickness of the anchor coat layer was 2 ⁇ m. Next, AL was deposited on the anchor coat layer by a vacuum deposition method to form a deposited layer. The thickness of the deposited layer was 50 nm.
  • a polyolefin having a carboxylic acid group product Chemipearl S100, ionomer system, average particle size: ⁇ 0.1 ⁇ m, solvent: water, IPA, manufactured by Mitsui Chemicals
  • a solution containing a polyolefin having a carboxylic acid group (trade name: Chemipearl S100, ionomer type, average particle size: less than 0.1 ⁇ m, solvent: water, IPA, manufactured by Mitsui Chemicals) was applied on the vapor deposition layer using a bar coater.
  • the mixture was dried in an oven to form an overcoat layer to obtain a gas packaging material.
  • the thickness of the overcoat layer was 5 ⁇ m.
  • the content of paper base material in the packaging material was 82% by mass.
  • Example 2 A packaging material was obtained in the same manner as in Example 1 except that the thickness of the overcoat layer was 10 ⁇ m. The content of paper base material in the packaging material was 76% by mass.
  • Example 3 A packaging material was obtained by the same operation as in Example 1, except that the thickness of the anchor coat layer was 3 ⁇ m and the thickness of the overcoat layer was 12 ⁇ m. The content of paper base material in the packaging material was 73% by mass.
  • Example 4 A packaging material was obtained in the same manner as in Example 1 except that the thickness of the overcoat layer was 3.5 ⁇ m. The content of paper base material in the packaging material was 84% by mass.
  • Example 5 A packaging material was obtained by the same operation as in Example 1, except that the thickness of the anchor coat layer was 1 ⁇ m and the thickness of the overcoat layer was 20 ⁇ m. The content of paper base material in the packaging material was 68% by mass.
  • Example 1 A packaging material was obtained in the same manner as in Example 1 except that the thickness of the overcoat layer was 0.5 ⁇ m. The content of paper base material in the packaging material was 88% by mass.
  • Example 2 A packaging material was obtained in the same manner as in Example 1 except that the thickness of the overcoat layer was 2 ⁇ m. The content of paper base material in the packaging material was 86% by mass.
  • the anchor coat layer is made of urethane, which is a cured product of acrylic polyol (acrylic polyol is a polymer of acrylic acid derivative monomers, or a polymer of acrylic acid derivative monomers and other monomers, and has a hydroxyl group at the end) and polyisocyanate.
  • the thickness of the anchor coat layer was 3 ⁇ m
  • the overcoat layer was made of a mixture of PVA and TEOS hydrolyzate
  • the thickness of the overcoat layer was 3.5 ⁇ m.
  • a packaging material was obtained by the same operation as in Example 1 except for the above.
  • the content of paper base material in the packaging material was 85% by mass.
  • Sodium polyacrylate was added as a dispersant to pigment (engineered kaolin, manufactured by Imerys, Varisurf HX, average particle size 9.0 ⁇ m, aspect ratio 80-100) (0.2% to pigment) and dispersed with a Serie mixer.
  • a kaolin slurry having a solid content concentration of 55% was prepared.
  • 100 parts (solid content) of styrene-butadiene latex manufactured by Nippon Zeon Co., Ltd., PNT7868
  • a coating solution for forming an anchor coat layer having a concentration of 50% was obtained.
  • Sodium polyacrylate was added as a dispersant to pigment (engineered kaolin, manufactured by Imerys, Varisurf HX, average particle size 9.0 ⁇ m, aspect ratio 80-100) (0.2% to pigment) and dispersed with a Serie mixer.
  • a kaolin slurry having a solid content concentration of 55% was prepared.
  • a polyvinyl alcohol (manufactured by Kuraray Co., Ltd., PVA117) aqueous solution was prepared to have a solid content concentration of 10% to obtain a PVA aqueous solution.
  • the coating liquid for forming an anchor coat layer was applied in a dry weight amount of 12 g/m 2 (anchor coat layer thickness: 12 ⁇ m). After coating on one side using a blade coater and drying, apply a coating liquid for overcoat layer formation on it in a dry weight of 3.0 g/m 2 (thickness of overcoat layer: 3 ⁇ m). It was coated on one side using a roll coater and dried to obtain a packaging material. The content of paper base material in the packaging material was 79% by mass.
  • a water-absorbing paper was placed on the measurement sample, and a smooth metal roller with a width of 200 mm, a diameter of 90 mm, and a weight of 10 kg was moved over the paper once to wipe off excess water remaining on the measurement sample after water absorption. .
  • the Cobb300 value (g/m 2 ) at a water absorption time of 300 seconds was calculated by multiplying the mass difference by 100.
  • the recyclability of the packaging material was evaluated.
  • the recyclability of the packaging material was evaluated based on the content of paper base material in the packaging material.
  • the evaluation results are shown in Table 1.
  • C The content of paper base material in the packaging material is less than 50% by 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)
PCT/JP2023/007358 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 Ceased WO2023176432A1 (ja)

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JP2024507696A JPWO2023176432A1 (https=) 2022-03-17 2023-02-28
AU2023235611A AU2023235611A1 (en) 2022-03-17 2023-02-28 Packaging material for aqueous content and packaging bag for aqueous content
EP23770390.5A EP4480699A4 (en) 2022-03-17 2023-02-28 Packaging material for aqueous content and packaging bag for aqueous content
US18/846,425 US20250198088A1 (en) 2022-03-17 2023-02-28 Packaging material for aqueous content and packaging bag for aqueous content

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JP7716559B1 (ja) * 2024-11-08 2025-07-31 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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JP7716559B1 (ja) * 2024-11-08 2025-07-31 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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US20250198088A1 (en) 2025-06-19

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