WO2022071399A1 - ガスバリア積層体及び包装袋 - Google Patents

ガスバリア積層体及び包装袋 Download PDF

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Publication number
WO2022071399A1
WO2022071399A1 PCT/JP2021/035874 JP2021035874W WO2022071399A1 WO 2022071399 A1 WO2022071399 A1 WO 2022071399A1 JP 2021035874 W JP2021035874 W JP 2021035874W WO 2022071399 A1 WO2022071399 A1 WO 2022071399A1
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WIPO (PCT)
Prior art keywords
gas barrier
barrier laminate
paper substrate
less
paper
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/JP2021/035874
Other languages
English (en)
French (fr)
Japanese (ja)
Inventor
純一 神永
良樹 越山
裕美子 小島
里佳 石井
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Toppan Inc
Original Assignee
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 EP21875699.7A priority Critical patent/EP4209343A4/en
Priority to CN202180065876.2A priority patent/CN116323208A/zh
Priority to US18/246,923 priority patent/US12570439B2/en
Priority to JP2022554045A priority patent/JPWO2022071399A1/ja
Publication of WO2022071399A1 publication Critical patent/WO2022071399A1/ja
Anticipated expiration legal-status Critical
Priority to JP2025199267A priority patent/JP2026020286A/ja
Ceased legal-status Critical Current

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    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/30—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers
    • B32B27/306—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers comprising vinyl acetate or vinyl alcohol (co)polymers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • 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
    • B65D31/10—Bags or like containers made of paper and having structural provision for thickness of contents with gusseted sides
    • 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
    • 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
    • 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
    • D21H19/80—Paper comprising more than one coating
    • D21H19/82—Paper comprising more than one coating superposed
    • 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
    • D21H19/824—Paper comprising more than one coating superposed two superposed coatings, both being non-pigmented
    • 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
    • B65D2565/00—Wrappers or flexible covers; Packaging materials of special type or form
    • B65D2565/38—Packaging materials of special type or form
    • B65D2565/381—Details of packaging materials of special type or form
    • B65D2565/385—Details of packaging materials of special type or form especially suited for or with means facilitating recycling
    • 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
    • B65D2565/00—Wrappers or flexible covers; Packaging materials of special type or form
    • B65D2565/38—Packaging materials of special type or form
    • B65D2565/381—Details of packaging materials of special type or form
    • B65D2565/387—Materials used as gas barriers
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W30/00—Technologies for solid waste management
    • Y02W30/50—Reuse, recycling or recovery technologies
    • Y02W30/80—Packaging reuse or recycling, e.g. of multilayer packaging

Definitions

  • the present invention relates to a gas barrier laminate and a packaging bag.
  • packaging materials In many fields such as foods, beverages, pharmaceuticals and chemicals, packaging materials according to their contents are used.
  • the packaging material is required to have permeation prevention properties (gas barrier properties) such as oxygen and water vapor, which cause deterioration of the contents.
  • Patent Document 1 discloses a gas barrier laminate in which a barrier layer is laminated on paper.
  • paper Since paper has crease holding property (also called dead holding property), it has a feature that it is easy to process.
  • crease holding property also called dead holding property
  • the barrier layer is cracked and the gas barrier property is deteriorated. It turns out that there is still room for improvement.
  • the present invention has been made in view of the above circumstances, has crease retention characteristic of paper, has sufficient gas barrier property even after being folded, and contributes to reduction of the amount of plastic material used. It is an object of the present invention to provide a gas barrier laminate and a packaging bag containing the same.
  • the present invention is a gas barrier laminate comprising a paper substrate and a vapor-deposited layer, which can be sealed by heat sealing, and the weight of the paper substrate is 30 to 100 g / m 2 , and the temperature is 40 ° C., 90%.
  • the water vapor permeability at RH is 3 g / m 2 ⁇ day or less
  • the oxygen permeability at 30 ° C. and 70% RH is 2 cc / m 2 / d / atm or less
  • the paper substrate is turned outward and folded.
  • a roller weighing 2 kg was rotated once on it, and the creases were opened.
  • RH was 4 g / m 2 ⁇ day or less, and at 30 ° C. and 70% RH.
  • Oxygen permeability is 5 cc / m 2 / d / atm or less, folded with the paper substrate inside, and a roller weighing 2 kg is rotated once on it, and the creases are opened and measured at 40 ° C.
  • the water vapor permeability at 90% RH is 4 g / m 2 ⁇ day or less, the oxygen permeability at 30 ° C.
  • RH is 5 cc / m 2 / d / atm or less
  • 70% RH is 5 cc / m 2 / d / atm or less
  • the weight of the paper substrate is Provided is a gas barrier laminate having a content of 47% by mass or more based on the total amount of the gas barrier laminate.
  • the weight of the paper base material may be 60% by mass or more with respect to the total amount of the gas barrier laminate.
  • the present invention is also a gas barrier laminate comprising a paper substrate and a vapor-deposited layer, which can be sealed by heat sealing, and the paper substrate is weighed from 30 to 100 g / m 2 at 40 ° C. and 90 ° C.
  • the water vapor permeability at% RH is 3 g / m 2 ⁇ day or less
  • the oxygen permeability at 30 ° C. and 70% RH is 2 cc / m 2 / d / atm or less
  • the paper substrate is folded on the outside.
  • a roller weighing 2 kg was rotated once on it, and the creases were opened.
  • the oxygen permeability is 5 cc / m 2 / d / atm or less, fold it with the paper substrate inside, rotate a roller weighing 2 kg once on it, open the crease, and measure at 40 ° C.
  • the water vapor permeability at 90% RH is 4 g / m 2 ⁇ day or less
  • the oxygen permeability at 30 ° C. and 70% RH is 5 cc / m 2 / d / atm or less
  • the thickness of the paper substrate is Provided is a gas barrier laminate having a ratio of 60% or more with respect to the entire gas barrier laminate.
  • the thickness of the paper base material may be 70% or more of the thickness of the entire gas barrier laminate.
  • a layer containing a polyolefin having at least one selected from a carboxyl group, a salt of a carboxyl group, a carboxylic acid anhydride group, and a carboxylic acid ester may be provided on the surface of the vapor deposition layer opposite to the paper substrate.
  • a layer containing a polyvinyl alcohol-based resin may be provided between the paper base material and the thin-film deposition layer.
  • the present invention also provides a packaging bag containing the gas barrier laminate according to the present invention and having a heat seal strength of 3N / 15 mm or more.
  • the above packaging bag may have a bent portion.
  • a gas barrier laminate that has crease retention which is a characteristic of paper, has sufficient gas barrier properties even after being bent, and contributes to a reduction in the amount of plastic material used
  • a gas barrier laminate which contributes to a reduction in the amount of plastic material used.
  • a packaging bag containing can be provided.
  • the gas barrier laminate according to the present embodiment is a gas barrier laminate that includes a paper base material and a thin-film deposition layer, and can be sealed by heat sealing.
  • the gas barrier laminate 10 according to the present embodiment includes at least a paper base material 1, a layer 2 containing a polyvinyl alcohol-based resin, a thin-film deposition layer 3, and a layer 4 containing polyolefin. May be good.
  • a layer containing a polyolefin may be further provided between the paper substrate and the vapor-deposited layer, further, two or more layers may be provided as the vapor-deposited layer, and a layer containing the polyolefin and a polyvinyl alcohol-based resin may be provided. There may be two or more layers including the layer.
  • the paper base material is not particularly limited, and may be appropriately selected depending on the intended use of the packaging material to which the gas barrier laminate is applied. Specific examples of the paper base material include high-quality paper, special high-quality paper, coated paper, art paper, cast-coated paper, imitation paper and kraft paper, and glassin paper.
  • the weighing of the paper substrate is 30 to 100 g / m 2 , preferably 35 to 90 g / m 2 , and even more preferably 40 to 80 g / m 2 .
  • the physical strength and processability as a packaging bag are good and preferable, while when it is 100 g / m 2 or less, the flexibility and productivity as a packaging bag are good. Is good and preferable.
  • the weight of the paper base material is 47% by mass or more, preferably 50% by mass or more, more preferably 60% by mass or more, and 70% by mass or more or 80% by mass, based on the total amount of the gas barrier laminate. The above is more preferable. If the weight of the paper base material is 47% by mass or more based on the total amount of the gas barrier laminate, the amount of plastic used can be sufficiently reduced, and if it is 50% by mass or more, the entire gas barrier laminate is made of paper. It can be said that it is excellent in recyclability.
  • the upper limit of the weight of the paper base material is not particularly limited, and may be, for example, less than 100% by mass or 90% by mass or less.
  • the thickness of the paper base material is preferably, for example, 60% or more, more preferably 70% or more, based on the thickness of the entire gas barrier laminate. If the thickness of the paper base material is 60% or more of the thickness of the entire gas barrier laminate, the amount of plastic used can be sufficiently reduced, and it can be said that the entire gas barrier laminate is made of paper. At the same time, it has excellent recyclability.
  • the upper limit of the thickness of the paper substrate is not particularly limited, and may be, for example, less than 100% or 90% or less.
  • the thickness of the paper substrate may be, for example, 30 ⁇ m or more and 100 ⁇ m or less, and may be 35 ⁇ m or more and 80 ⁇ m or less.
  • the paper substrate may be provided with a coat layer at least on the side in contact with the vapor deposition layer described later.
  • a coat layer By providing the coat layer, it can serve as a seal to fill the unevenness of the paper, and the vapor-deposited layer can be uniformly formed without defects.
  • the binder resin include various copolymers such as polyolefin-based, styrene-butadiene-based, styrene / acrylic-based, ethylene-vinyl acetate-based, polyvinyl alcohol-based resin, cellulose-based resin, paraffin (WAX) and the like.
  • a filler for example, clay, kaolin, calcium carbonate, talc, mica and the like may be contained.
  • the thickness of the coat layer is not particularly limited, but may be, for example, 1 to 10 ⁇ m or 3 to 8 ⁇ m.
  • the thin-film deposition layer has a role of imparting a water vapor barrier property to the gas barrier laminate, and is a layer on which a metal or a metal oxide is vapor-deposited.
  • the thin-film vapor deposition layer may be obtained by vapor-filming aluminum, or may contain aluminum oxide (AlO x ), silicon oxide (SiO x ), or the like.
  • the thickness of the thin-film deposition layer may be appropriately set according to the intended use, but is preferably 10 nm or more, 30 nm or more, 50 nm or more, and may be 500 nm or less, 100 nm or less, 80 nm or less.
  • the thickness of the thin-film deposition layer 10 nm or more it is easy to make the continuity of the thin-film deposition layer sufficient, and by making it 500 nm or less, the occurrence of curls and cracks can be sufficiently suppressed, and sufficient gas barrier performance and flexibility are achieved. It's easy to do.
  • the thin-film deposition layer is preferably formed by a vacuum film-forming means from the viewpoint of gas barrier performance and film uniformity.
  • a vacuum film-forming means there are known methods such as a vacuum vapor deposition method, a sputtering method, and a chemical vapor phase growth method (CVD method), but the vacuum vapor deposition method is preferable because the film forming speed is high and the productivity is high.
  • the film forming means by electron beam heating is particularly effective because the film forming speed can be easily controlled by the irradiation area and the electron beam current, and the temperature of the vapor deposition material can be raised and lowered in a short time. Is.
  • thin-film vapor deposition layers When there are a plurality of thin-film vapor deposition layers, they may be thin-film deposition layers using the same kind of materials as each other, or may be thin-film deposition layers using different materials.
  • the layer containing the polyvinyl alcohol-based resin is provided on the surface of the paper base material, for example, to improve the adhesion between the paper base material and the vapor-deposited layer and to improve the gas barrier property (particularly the oxygen barrier property) of the gas barrier laminate. It is provided for this purpose.
  • the polyvinyl alcohol-based resin is, for example, a completely saponified polyvinyl alcohol resin, a partially saponified polyvinyl alcohol resin, a modified polyvinyl alcohol resin, an ethylene-vinyl alcohol copolymer resin, and the like.
  • the degree of polymerization of the polyvinyl alcohol-based resin is preferably 300 or more and 1500 or less.
  • the degree of polymerization is 300 or more, the barrier property and bending resistance of the gas barrier laminate are good, and when the degree of polymerization is 1500 or less, the viscosity of the polyvinyl alcohol-based resin coating liquid described later is low, and the coating property is good. Becomes good.
  • a method of providing a layer containing a polyvinyl alcohol-based resin for example, it can be obtained by applying a coating liquid containing the above-mentioned polyvinyl alcohol-based resin and a solvent on a paper substrate and drying it.
  • the solvent contained in the coating liquid include water, methyl alcohol, ethyl alcohol, isopropyl alcohol, n-propyl alcohol, n-butyl alcohol, n-pentyl alcohol, dimethyl sulfoxide, dimethyl formamide, dimethyl acetamide and the like.
  • a mixed solvent of water and an alcohol such as methyl alcohol, ethyl alcohol, or isopropyl alcohol is preferable.
  • the coating liquid may contain additives such as a surfactant, a preservative, a storage stabilizer, a silane coupling agent, an organic titanate, a polyolefin-based emulsion, and an antifoaming agent.
  • additives such as a surfactant, a preservative, a storage stabilizer, a silane coupling agent, an organic titanate, a polyolefin-based emulsion, and an antifoaming agent.
  • Such a layer containing a polyvinyl alcohol-based resin has excellent flexibility, can suppress cracking of the vapor-filmed layer after bending (after bending), and can suppress deterioration of gas barrier properties, and can also suppress deterioration of gas barrier properties, and the vapor-filmed layer and the polyvinyl alcohol-based resin. It is possible to improve the adhesion with the layer containing.
  • the thickness of the layer containing the polyvinyl alcohol-based resin may be, for example, 1 ⁇ m or more, 2 ⁇ m or more, or 5 ⁇ m or less.
  • the thickness is 1 ⁇ m or more, the above-mentioned unevenness of the paper substrate can be efficiently filled, and the thin-film deposition layer can be uniformly laminated. Further, when the thickness is 5 ⁇ m or less, the thin-film deposition layer can be uniformly laminated while keeping the cost down.
  • the gas barrier laminate according to the present embodiment has a layer containing a polyolefin, preferably a carboxyl group, a salt of a carboxyl group, and a carboxylic acid anhydride group on at least the surface of the vapor deposition layer opposite to the paper substrate. And a layer containing a polyolefin having at least one selected from carboxylic acid esters.
  • a layer containing a polyolefin By providing such a layer containing a polyolefin, the crystallinity of the polyolefin improves the water vapor barrier property, further improves the adhesion with the vapor-filmed layer, prevents the vapor-filmed layer from cracking due to bending, and is laminated with a gas barrier property. It is possible to impart heat-sealing properties to the body. By having various functions in this way, it is not necessary to separately provide an adhesive layer, a protective layer, and a heat-sealing resin layer, so that the amount of plastic used can be reduced.
  • the layer containing the polyolefin is preferably a coating of an aqueous emulsion and a dry film, and may contain a polyolefin emulsion having at least one selected from a carboxyl group, a salt of a carboxyl group, a carboxylic acid anhydride and a carboxylic acid ester. preferable.
  • the same kind of materials may be used or different materials may be used.
  • a method of providing a layer containing a polyolefin it can be obtained by applying a coating liquid containing the above-mentioned material constituting the resin layer and a solvent on the vapor-deposited layer and drying the layer.
  • the solvent contained in the coating liquid include water, methyl alcohol, ethyl alcohol, isopropyl alcohol, n-propyl alcohol, n-butyl alcohol, n-pentyl alcohol, dimethyl sulfoxide, dimethyl formamide, dimethyl acetamide and the like.
  • a mixed solvent of water and an alcohol such as methyl alcohol, ethyl alcohol, or isopropyl alcohol is preferable.
  • the coating liquid may contain additives such as a surfactant, a preservative, a storage stabilizer, a silane coupling agent, an organic titanate anti-blocking agent, a slip agent, and an antifoaming agent.
  • the film thickness of the layer containing the polyolefin may be, for example, 0.5 ⁇ m or more and 10 ⁇ m or less.
  • the film thickness is 0.5 ⁇ m or more, the heat seal strength and the barrier property improving effect can be sufficiently obtained, and when the film thickness is 10 ⁇ m or less, the cost can be suppressed and the paper of the gas barrier laminate according to the present embodiment can be suppressed.
  • the ratio of can be increased.
  • the gas barrier laminate according to the present embodiment can exhibit sufficient gas barrier properties even after being bent.
  • the gas barrier property means that the water vapor transmission rate and the oxygen permeability are sufficiently low.
  • the water vapor transmission rate of the gas barrier laminate according to the present embodiment is preferably 3 g / m 2 ⁇ day or less under the conditions of a temperature of 40 ° C. and a relative humidity of 90% RH, which is 2 g / m. 2. Day or less is more preferable.
  • the packaging bag using this gas barrier laminate can suppress deterioration of the contents due to moisture absorption and water evaporation for a long period of time.
  • the gas barrier laminate according to the present embodiment When the gas barrier laminate according to the present embodiment is folded with the paper base material on the outside, a roller weighing 2 kg is rotated once, the creases are opened, and the water vapor transmission rate is measured, the water vapor transmission rate is determined. Under the conditions of a temperature of 40 ° C. and a relative humidity of 90% RH, it is preferably 4 g / m 2 ⁇ day or less, and more preferably 3 g / m 2 ⁇ day or less.
  • the water vapor transmission rate is determined.
  • a temperature of 40 ° C. and a relative humidity of 90% RH it is preferably 4 g / m 2 ⁇ day or less, and more preferably 3 g / m 2 ⁇ day or less.
  • the water vapor transmission rate with creases is 4 g / m 2 ⁇ day or less, even in the case of packaging bags with creases such as pillow packaging, three-way seal packaging, gusset packaging, etc., the contents will deteriorate for a long time due to moisture absorption and moisture evaporation. Can be suppressed over.
  • the oxygen permeability of the gas barrier laminate according to this embodiment is 2 cc / m 2 / d / atm or less under the conditions of JIS K7126, B method (isopressure method), temperature 30 ° C. and relative humidity 70% RH. It is preferably 1 cc / m 2 / d / atm or less, and more preferably.
  • the oxygen permeability is 2 cc / m 2 / d / atm or less, the packaging bag using the present gas barrier laminate can suppress deterioration due to oxidation of the contents for a long period of time.
  • the gas barrier laminate according to the present embodiment is folded with the paper substrate on the outside, a roller weighing 2 kg is rotated once, and the creases are opened, and oxygen permeation at 30 ° C. and 70% RH is measured.
  • the degree is preferably 5 cc / m 2 / d / atm or less, and more preferably 3 cc / m 2 / d / atm or less.
  • the gas barrier laminate according to the present embodiment is folded with the paper substrate inside, a roller weighing 2 kg is rotated once, and the creases are opened, and oxygen permeation at 30 ° C. and 70% RH is measured.
  • the degree is preferably 5 cc / m 2 / d / atm or less, and more preferably 3 cc / m 2 / d / atm or less. Since the oxygen permeability with creases is 5 cc / m 2 / d / atm or less, even in the case of packaging bags with creases such as pillow packaging, three-way seal packaging, gusset packaging, etc., deterioration due to oxidation of the contents over a long period of time It can be suppressed.
  • FIG. 2 is a perspective view showing a gusset bag 20 made of a gas barrier laminated body 10.
  • a packaging bag is manufactured by sealing the opening at the top of the gusset bag 20.
  • the gusset bag 20 has a portion (bent portions B1 and B2) in which the gas barrier laminate 10 is bent.
  • the bent portion B1 is a portion where the gas barrier laminated body is valley-folded when viewed from the innermost layer side
  • the bent portion B2 is a portion where the gas barrier laminated body 10 is mountain-folded when viewed from the innermost layer side.
  • the packaging bag is formed into a bag shape by folding one gas barrier laminate in half so that the opposite sides of the paper base materials face each other, and then appropriately bending and heat-sealing the packaging bag so as to have a desired shape.
  • two gas barrier laminates may be stacked so that the opposite sides of the paper base materials face each other, and then heat-sealed to form a bag shape.
  • the heat seal strength may be 3N / 15 mm or more, and may be 4N / 15 mm or more.
  • the upper limit of the heat seal strength is not particularly limited, but may be, for example, 10 N / 15 mm or less.
  • the heat seal strength is 3N / 15 mm or more, the contents can be protected in various distribution processes until the packaging bag is opened.
  • the packaging bag can contain the contents such as foods and medicines as the contents. Especially suitable for storing sweets and the like as food.
  • the packaging bag according to the present embodiment can maintain high gas barrier properties even in a shape having a bent portion. Furthermore, the high proportion of paper has the potential to be recycled as recycled paper after use, reducing the amount of plastic waste discarded.
  • a gusset bag is mentioned as an example of a packaging bag, but a pillow bag, a three-way seal bag or a standing pouch may be manufactured by using the gas barrier laminate according to the present embodiment. ..
  • Examples 1 to 12 Comparative Example 1
  • a layer containing a polyvinyl alcohol resin, a vapor-deposited layer, and a layer containing polyolefin were formed in this order on the clay coat surface of the paper substrate to prepare a gas barrier laminate having the configurations shown in Tables 1 to 4 below.
  • the layer containing a polyvinyl alcohol-based resin and the layer containing a polyolefin were formed by applying a coating liquid with a bar coater and drying in an oven, and the thin-film deposition layer was formed by a vacuum vapor deposition method.
  • the materials used are as follows.
  • -Clay coated paper Paper thickness: 50 ⁇ m, Paper density: 0.8 g / cm 3 , Clay coated layer thickness: 5 ⁇ m, Clay coated layer density: 3 g / cm 3 , Weighing: 60 g / m 2 (Paper: 43.6 g / m 2 , clay coat layer: 16.4 g / m 2 ) -Clay coated paper: Paper thickness: 30 ⁇ m, Paper density: 0.8 g / cm 3 , Clay coated layer thickness: 5 ⁇ m, Clay coated layer density: 3 g / cm 3 , Weighing: 40 g / m 2 (Paper: 24.6 g / m 2 , clay coat layer: 15.4 g / m 2 ) Clay coated paper: Paper thickness: 100 ⁇ m, Paper density: 0.8 g / cm 3 , Clay coated layer thickness: 5 ⁇ m, Clay coated layer density: 3 g / cm 3 , Weighing: 100 g / m 2 (Paper: 84.2
  • Example 13 to 24, Comparative Examples 2 to 3 A layer containing polyolefin, a layer containing polyvinyl alcohol resin, a vapor-deposited layer, and a layer containing polyolefin are formed in this order on the clay coat surface of the paper substrate, and the gas barrier laminate having the configurations shown in Tables 5 to 8 below is formed.
  • the body was made.
  • the layer containing a polyvinyl alcohol-based resin and the layer containing a polyolefin were formed by applying a coating liquid with a bar coater and drying in an oven, and the thin-film deposition layer was formed by a vacuum vapor deposition method.
  • the materials used are as follows.
  • -Clay coated paper Paper thickness: 50 ⁇ m, Paper density: 0.8 g / cm 3 , Clay coated layer thickness: 5 ⁇ m, Clay coated layer density: 3 g / cm 3 , Weighing: 60 g / m 2 (Paper: 43.6 g / m 2 , clay coat layer: 16.4 g / m 2 ) -Clay coated paper: Paper thickness: 30 ⁇ m, Paper density: 0.8 g / cm 3 , Clay coated layer thickness: 5 ⁇ m, Clay coated layer density: 3 g / cm 3 , Weighing: 40 g / m 2 (Paper: 24.6 g / m 2 , clay coat layer: 15.4 g / m 2 ) Clay coated paper: Paper thickness: 100 ⁇ m, Paper density: 0.8 g / cm 3 , Clay coated layer thickness: 5 ⁇ m, Clay coated layer density: 3 g / cm 3 , Weighing: 100 g / m 2 (Paper: 84.2
  • Examples 25 to 32 A layer containing polyolefin, a vapor-deposited layer, a layer containing a polyvinyl alcohol-based resin, a vapor-deposited layer, and a layer containing polyolefin are formed in this order on the clay coat surface of the paper substrate, and the configurations shown in Tables 9 to 10 below are formed.
  • the layer containing a polyvinyl alcohol-based resin and the layer containing a polyolefin were formed by applying a coating liquid with a bar coater and drying in an oven, and the thin-film deposition layer was formed by a vacuum vapor deposition method.
  • the materials used are as follows.
  • -Clay coated paper Paper thickness: 50 ⁇ m, Paper density: 0.8 g / cm 3 , Clay coated layer thickness: 5 ⁇ m, Clay coated layer density: 3 g / cm 3 , Weighing: 60 g / m 2 (Paper: 43.6 g / m 2 , clay coat layer: 16.4 g / m 2 )
  • Polyvinyl alcohol Saponification degree 98%, polymerization degree 500 (manufactured by Kuraray) -Denatured polyvinyl alcohol: Exevar RS-4104 (manufactured by Kuraray)
  • Chemipearl S100 Polyolefin aqueous dispersion containing a salt of a carboxyl group (manufactured by Mitsui Chemicals)
  • -Chemipearl S500 Polyolefin aqueous dispersion containing a salt of a carboxyl group (manufactured by Mitsui Chemicals) ⁇ Chem
  • a coating liquid containing an amide alkyd resin is applied on the surface of paper (clay coated paper, paper thickness: 50 ⁇ m, clay coat layer thickness: 5 ⁇ m) with a bar coater, dried in an oven, and contains the amide alkyd resin. A layer was formed. The thickness of the layer was 4 ⁇ m. Subsequently, AL vapor deposition was performed on this layer. The thickness of the AL vapor deposition layer was 50 nm. Then, a coating liquid containing a polyvinyl alcohol resin and TEOS was applied onto the AL vapor-filmed layer with a bar coater and dried in an oven to form a layer containing the polyvinyl alcohol resin and TEOS.
  • the thickness of the layer was 0.4 ⁇ m.
  • a coating liquid containing a salt of a carboxyl group (trade name: Chemipearl S500, manufactured by Mitsui Chemicals) was applied with a bar coater and dried in an oven to form a layer containing polyolefin to obtain a gas barrier laminate.
  • the thickness of the layer containing the polyolefin was 3 ⁇ m.
  • the oxygen permeability of the gas barrier laminate according to Examples and Comparative Examples was measured by JIS K7126, B method (isopressure method).
  • the measuring device used was OXTRAN 2/20 manufactured by MOCON, and the measurement was performed at a temperature of 30 ° C. and a relative humidity of 70%.
  • the results are shown in Tables 1 to 11 in units [cc / m 2 / d / atm].

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Laminated Bodies (AREA)
  • Wrappers (AREA)
  • Bag Frames (AREA)
  • Paper (AREA)
PCT/JP2021/035874 2020-09-30 2021-09-29 ガスバリア積層体及び包装袋 Ceased WO2022071399A1 (ja)

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EP21875699.7A EP4209343A4 (en) 2020-09-30 2021-09-29 Gas-barrier multilayer body and packageing bag
CN202180065876.2A CN116323208A (zh) 2020-09-30 2021-09-29 气体阻隔层叠体及包装袋
US18/246,923 US12570439B2 (en) 2020-09-30 2021-09-29 Gas-barrier multilayer body and packaging bag
JP2022554045A JPWO2022071399A1 (https=) 2020-09-30 2021-09-29
JP2025199267A JP2026020286A (ja) 2020-09-30 2025-11-19 ガスバリア積層体及び包装袋

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EP4378681A4 (en) * 2021-08-12 2025-01-01 Toppan Inc. Gas barrier laminate and packaging

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US20240253853A1 (en) 2023-01-30 2024-08-01 Pratt Corrugated Holdings, Inc. Meal kit assembly
US12264006B1 (en) 2023-12-21 2025-04-01 Pratt Corrugated Holdings, Inc. Insulated packaging liner
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WO2024204251A1 (ja) * 2023-03-30 2024-10-03 Ｔｏｐｐａｎホールディングス株式会社 積層体及び包装袋

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US12570439B2 (en) 2026-03-10
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US20230365304A1 (en) 2023-11-16
EP4209343A1 (en) 2023-07-12
CN116323208A (zh) 2023-06-23

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