WO2021153240A1 - 水性ヒートシール剤、紙容器用紙基材、紙容器、及び紙容器の製造方法 - Google Patents

水性ヒートシール剤、紙容器用紙基材、紙容器、及び紙容器の製造方法 Download PDF

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Publication number
WO2021153240A1
WO2021153240A1 PCT/JP2021/000944 JP2021000944W WO2021153240A1 WO 2021153240 A1 WO2021153240 A1 WO 2021153240A1 JP 2021000944 W JP2021000944 W JP 2021000944W WO 2021153240 A1 WO2021153240 A1 WO 2021153240A1
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Prior art keywords
paper
container
aqueous
base material
wax
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PCT/JP2021/000944
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English (en)
French (fr)
Japanese (ja)
Inventor
浩 菊池
榎本　肇
田中　克則
衛 越知
Original Assignee
Ｄｉｃグラフィックス株式会社
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Application filed by Ｄｉｃグラフィックス株式会社 filed Critical Ｄｉｃグラフィックス株式会社
Priority to CN202180006940.XA priority Critical patent/CN114729247A/zh
Priority to JP2021553859A priority patent/JP7014345B2/ja
Publication of WO2021153240A1 publication Critical patent/WO2021153240A1/ja
Priority to JP2021198354A priority patent/JP2022043123A/ja

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B1/00—Layered products having a non-planar shape
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B27/10—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of paper or cardboard
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B29/00—Layered products comprising a layer of paper or cardboard
    • 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
    • B65D3/00—Rigid or semi-rigid containers having bodies or peripheral walls of curved or partially-curved cross-section made by winding or bending paper without folding along defined lines
    • B65D3/22—Rigid or semi-rigid containers having bodies or peripheral walls of curved or partially-curved cross-section made by winding or bending paper without folding along defined lines with double walls; with walls incorporating air-chambers; with walls made of laminated material
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K5/00—Use of organic ingredients
    • C08K5/16—Nitrogen-containing compounds
    • C08K5/20—Carboxylic acid amides
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L91/00—Compositions of oils, fats or waxes; Compositions of derivatives thereof
    • C08L91/06—Waxes
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J11/00—Features of adhesives not provided for in group C09J9/00, e.g. additives
    • C09J11/02—Non-macromolecular additives
    • C09J11/06—Non-macromolecular additives organic
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J123/00—Adhesives based on homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Adhesives based on derivatives of such polymers
    • C09J123/02—Adhesives based on homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Adhesives based on derivatives of such polymers not modified by chemical after-treatment
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J133/00—Adhesives based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Adhesives based on derivatives of such polymers
    • C09J133/02—Homopolymers or copolymers of acids; Metal or ammonium salts thereof

Definitions

  • the present invention relates to a water-based sheet sealant used for a paper container, a paper container paper base material using the water-based heat sealant, a paper container, and a method for manufacturing a paper container.
  • Paper containers for food which were developed as ice cream containers in the olden days, have since spread vending machines, increased convenience stores and fast food stores, popularized outdoor leisure, and introduced tea dispensers at work. Along with social phenomena and changes in the living environment, various beverage paper cups have been improved and their demand has increased dramatically.
  • Japan the advantages of paper containers have been reviewed since the 1970s as a pollution control measure due to plastic disposal, and paper cups for tea and coffee have since been targeted for desserts such as yogurt, pudding and jelly, and natto and delicatessen.
  • the application is expanding.
  • the problem of marine plastic waste such as microplastics has been highlighted again, and as one of the materials with functions such as "reusable” and “biodegradable”, renewable resources
  • paper made from "wood”.
  • Paper cups which are one of the widely used paper containers for foods, are made of paper, but polyethylene film, which reduces recycling efficiency, is used as a part of the raw material.
  • a normal paper cup is obtained by sticking a polyethylene film, a polypropylene film, or the like obtained by extruding a polyethylene resin, a polypropylene resin, or the like melted by heat into a film shape to a paper base material.
  • the polyethylene film When the polyethylene film is molded into a paper cup, it acts as an adhesive by heat melting under indirect heating such as a burner or hot air, and since the polyethylene film exists inside the paper cup, it is waterproof without the paper base material coming into direct contact with the contents. Gender and strength are given.
  • the bonded polyethylene film does not dissolve in the alkaline solution used in the paper recycling process at the time of paper recycling, so it must be physically removed, which leads to a decrease in recycling efficiency.
  • marine pollution caused by the outflow of plastic waste into the ocean has become a global problem.
  • the target of the Sustainable Development Goals (SDGs) is "By 2025, prevent and significantly reduce all types of marine pollution, including marine debris and eutrophication, especially pollution from land activities.” It has become an important global theme, as it has been raised and it has been agreed to strengthen its efforts at the summit (summit of major countries). Therefore, there is a need for a polyethylene film substitute that can be applied to these applications and does not reduce the paper recycling efficiency. There is also a demand for paper containers that do not use plastic films.
  • a water-based heat sealant is known as an adhesive that acts as an adhesive when molding a paper cup.
  • an ethylene-based resin aqueous dispersion in which an olefin- ⁇ , ⁇ unsaturated carboxylic acid copolymer neutralized with ammonia or amine and an olefin-based thermoplastic resin other than the above are mixed and dispersed in a specific ratio. It is disclosed that the liquid can be applied as a heat sealant.
  • Patent Document 2 an aqueous dispersion containing a polyolefin resin composed of an unsaturated carboxylic acid unit, an ethylene-based hydrocarbon, and an acrylic acid ester or a methacrylic acid ester, a natural wax, and an aqueous medium in a specific ratio.
  • a heat sealant such as heat seal strength and blocking resistance
  • the desired heat seal function and cup inner surface coating as an alternative to the polyethylene film used for paper cups are disclosed. No description is given regarding the compatibility of waterproofness and strength desired for the agent, and recyclability.
  • the problem to be solved by the present invention is to achieve both a heat sealing function desired as a substitute for a polyethylene film used for a paper container such as a paper cup and a waterproofness and strength desired for a coating agent on the inner surface of the cup, and paper recycling. It is an object of the present invention to provide an aqueous heat sealant which can be recycled without sorting, and a paper container using the aqueous heat sealant.
  • the present invention provides an aqueous heat sealant containing an aqueous solvent, an olefin- ⁇ , ⁇ unsaturated carboxylic acid copolymer and a wax.
  • the present invention also provides a paper container paper base material having the aqueous heat sealant according to claim 1 or 2 on at least one side of the paper base material.
  • the present invention also provides a paper container using the paper container having the aqueous heat sealant according to claim 1 or 2 on at least one side of the paper base material.
  • the present invention is made of a paper base material in which a resin layer is provided at least on the inner surface of the container and the bonding surface when assembling the container, and the bonded surfaces at both ends of the paper base material are rolled and overlapped by heat welding.
  • Shaped body member (1) and Paper having at least a paper base material having a resin layer provided on the inner surface of the container and the bonding surface when assembling the container, and having a plate-shaped bottom member (2) heat-welded to the lower end of the body member (1). It ’s a container manufacturing method.
  • the resin layer comprises the dry coating film of the aqueous heat sealant described above.
  • the water-based heat-sealing agent of the present invention can achieve both the desired heat-sealing function as a substitute for the polyethylene film used for paper containers such as paper cups and the waterproofness and strength desired for the inner surface coating agent of the cup, and can be recycled from paper. Sometimes it can be recycled without sorting. Therefore, the aqueous heat sealant of the present invention is useful as a substitute for the polyethylene film in a paper container such as a paper cup.
  • the aqueous heat sealant of the present invention is characterized by containing an aqueous solvent, an olefin- ⁇ , ⁇ unsaturated carboxylic acid copolymer and a wax.
  • aqueous solvent As the aqueous solvent used in the present invention, water, a water-soluble organic solvent soluble in water, or the like can be used. As the water, pure water such as ion-exchanged water, ultra-filtered water, reverse osmosis water, distilled water, or ultrapure water can be used. Further, as the water, water sterilized by ultraviolet irradiation or addition of hydrogen peroxide can be used to prevent the growth of mold or bacteria when the aqueous pigment dispersion or the ink using the aqueous pigment dispersion is stored for a long period of time. It is suitable because it can be used.
  • water-soluble organic solvent examples include glycols such as ethylene glycol, diethylene glycol, triethylene glycol, tetraethylene glycol, propylene glycol, polyethylene glycol and polypropylene glycol; diols such as butanediol, pentanediol and hexanediol; propylene laurate.
  • glycols such as ethylene glycol, diethylene glycol, triethylene glycol, tetraethylene glycol, propylene glycol, polyethylene glycol and polypropylene glycol
  • diols such as butanediol, pentanediol and hexanediol
  • propylene laurate examples of the water-soluble organic solvent
  • Glycol esters such as glycols; diethylene glycol ethers such as diethylene glycol monoethyl, diethylene glycol monobutyl, diethylene glycol monohexyl, carbitol; glycol ethers such as cellosolves containing propylene glycol ethers, dipropylene glycol ethers, and triethylene glycol ethers; methanol , Ethanol, isopropyl alcohol, 1-propanol, 2-propanol, 1-butanol, 2-butanol, butyl alcohol, pentyl alcohol and other alcohols; sulfolane, ester, ketone, ⁇ -butyrolactone and other lactones, N- (2) Examples thereof include lactams such as -hydroxyethyl) pyrrolidone, and various other solvents known as aqueous organic solvents such as glycerin and its polyalkylene oxide adduct. These aqueous organic solvents can be used alone or in
  • the olefin- ⁇ , ⁇ -unsaturated carboxylic acid copolymer used in the present invention includes an olefin, a metal salt of ⁇ , ⁇ -unsaturated carboxylic acid, ⁇ , ⁇ -unsaturated carboxylic acid, and ⁇ , ⁇ -.
  • Examples thereof include a copolymer with at least one monomer selected from the group consisting of unsaturated carboxylic acid esters.
  • it is a metal salt of ⁇ , ⁇ -unsaturated carboxylic acid, ⁇ , ⁇ -unsaturated carboxylic acid or a copolymer of ⁇ , ⁇ -unsaturated carboxylic acid ester and olefin, and is olefin- ⁇ , ⁇ .
  • Unsaturated carboxylic acid copolymer ethylene-acrylic acid ester copolymer, ethylene-methacrylic acid copolymer, ethylene-methacrylic acid ester copolymer, ethylene-acrylic acid-maleic anhydride copolymer, ethylene-acrylic acid
  • Examples thereof include an ester-maleic anhydride copolymer, an ethylene-methacrylic anhydride-maleic anhydride copolymer, an ethylene-methacrylic anhydride-maleic anhydride copolymer, and a metal salt thereof. These copolymers may be used alone or as a mixture of two or more kinds.
  • olefin- ⁇ and ⁇ unsaturated carboxylic acid copolymers are preferable.
  • examples of the olefin- ⁇ , ⁇ -unsaturated carboxylic acid copolymer include a random copolymer of ethylene- and ⁇ , ⁇ -unsaturated carboxylic acid, or a block copolymer.
  • olefin examples include ethylene, propylene, 1-butene, 1-pentene, 1-hexene, 1-octene, 1-decene, 4-methyl-1-pentene, butadiene, dicyclopentadiene, 5-ethylidene-2- Norbornene and the like can be mentioned. Of these, ethylene is preferable.
  • Examples of the ⁇ , ⁇ -unsaturated carboxylic acid include acrylic acid, methacrylic acid, crotonic acid, maleic acid, fumaric acid, itaconic acid and the like. Among these, acrylic acid and methacrylic acid are preferably used. These ⁇ , ⁇ -unsaturated carboxylic acids may be used alone or in combination of two or more.
  • ⁇ , ⁇ -unsaturated carboxylic acid ester known acrylic acid or methacrylic acid alkyl esters, hydroxyalkyl esters, alkoxyalkyl esters and the like can be used without particular limitation.
  • the olefin- ⁇ , ⁇ unsaturated carboxylic acid copolymer can be produced by a known method, for example, radical copolymerization under high temperature and high pressure.
  • the content of ⁇ , ⁇ -unsaturated carboxylic acid in the above-mentioned olefin- ⁇ , ⁇ -unsaturated carboxylic acid copolymer is preferably 8 to 24% by weight, preferably 18 to 23% by weight.
  • the content of ⁇ , ⁇ -unsaturated carboxylic acid is less than 8% by weight, the dispersibility in an aqueous dispersion medium is poor due to the non-polar property derived from ethylene-unit, and excellent olefin- ⁇ , ⁇ -unsaturated. It may be difficult to obtain an aqueous dispersion of a carboxylic acid copolymer resin.
  • the content of ⁇ , ⁇ -unsaturated carboxylic acid exceeds 24% by weight, the blocking resistance of the obtained film may deteriorate.
  • the olefin- ⁇ , ⁇ unsaturated carboxylic acid copolymer used in the present invention is used as an aqueous dispersion dispersed in an aqueous solvent.
  • the method of dispersing in an aqueous solvent is not particularly limited, and a known method may be used.
  • a method of emulsifying with a surfactant and dispersing in an aqueous solvent a method of neutralizing an olefin- ⁇ , ⁇ unsaturated carboxylic acid copolymer with a basic compound and then dispersing in an aqueous solvent, and the like can be mentioned.
  • surfactant used for emulsification various known anionic, cationic, nonionic surfactants, or various water-soluble polymers can be used in combination as appropriate.
  • the basic compound used for neutralization examples include organic amines such as ammonia, methylamine, ethylamine, diethylamine, dimethylethanolamine, diethanolamine and triethanolamine, sodium hydroxide, potassium hydroxide and lithium hydroxide. Such as alkali metal hydroxides. These basic compounds may be used alone or in combination of two or more.
  • the degree of neutralization by the basic compound may be any degree as long as the degree of neutralization in which the olefin- ⁇ , ⁇ -unsaturated carboxylic acid copolymer is stably present in the aqueous solvent. For example, it may be 30 to 100 mol% of the carboxyl group of the copolymer, and more preferably 40 to 90 mol%.
  • a known method for example, as a dispersion device using media, a paint shaker, a ball mill, an attritor, a basket mill, a sand mill, a sand grinder, a dyno mill, a dispermat, an SC mill, a spike mill, an agitator mill and the like can be used. It can be used and can be dispersed by an ultrasonic homogenizer, a high-pressure homogenizer, a nanomizer, a resolver, a disper, a high-speed impeller disperser, or the like without using a medium.
  • the solid content of the aqueous dispersion of the olefin- ⁇ , ⁇ -unsaturated carboxylic acid copolymer used in the present invention is not particularly limited, and has a desired viscosity when applied as a heat sealant and after application of the heat sealant. It may be appropriately determined depending on the drying conditions, the film thickness, and the like. Generally, it is often applied in the range of solid content concentration of 10 to 40% by mass.
  • wax In the aqueous heat sealant of the present invention, blocking resistance can be maintained by adding wax.
  • the wax include fatty acid amide wax, carnauba wax, polyolefin wax, paraffin wax, Fisher Tropsch wax, mitsuro, microcrystallin wax, polyethylene oxide-wax, amide wax and other waxes, coconut oil fatty acid and soybean oil fatty acid. be able to. These may be used alone or in combination. Of these, fatty acid amide wax, carnauba wax, and Fisher Tropsch wax are preferably used, and fatty acid amide wax and carnauba wax are particularly preferable.
  • fatty acid amide wax examples include pelargonic acid amide, capric acid amide, undecyl acid amide, lauric acid amide, tridecyl acid amide, myristic acid amide, pentadecyl acid amide, palmitic acid amide, heptadecyl acid amide, and stearic acid amide.
  • Nonadecanic acid amide, araquinic acid amide bechenic acid amide, lignoseric acid amide, oleic acid amide, setreic acid amide, linoleic acid amide, linolenic acid amide, mixtures thereof, animal and vegetable fat and oil fatty acid amides and the like.
  • carnauba wax examples include MICROKLEAR 418 (manufactured by MicroPowerers, Inc.), purified carnauba wax No. 1 powder (Nippon Wax Co., Ltd.) and the like.
  • the total amount of the wax blended is preferably 1.5 to 20% by mass with respect to the total amount of the aqueous heat sealant solid content of 100% by mass. If the total amount of wax is 3% by mass or more with respect to the total amount of 100% solid content of the aqueous heat sealant, the blocking resistance tends to be maintained, and the total amount of wax is 15% by mass or less with respect to the total amount of 100% solid content of the aqueous heat sealant. If there is, there is a tendency that the heat sealability can be maintained.
  • the combined use of the fatty acid amide wax and the carnauba wax is more preferable because the blocking resistance is further improved.
  • the wax may be directly added to the aqueous dispersion of the olefin- ⁇ , ⁇ -unsaturated carboxylic acid copolymer and mixed and dispersed, or the olefin- ⁇ , ⁇ -unsaturated carboxylic acid copolymer may be used as an aqueous solvent. It may be added at the same time as the dispersion and mixed and dispersed.
  • the dispersion method the method used in the above-mentioned method for dispersing the olefin- ⁇ , ⁇ unsaturated carboxylic acid copolymer in an aqueous solvent can be appropriately used.
  • a plurality of types of waxes may be added at the same time, or may be added separately in a plurality of steps.
  • the second wax is added to the obtained first wax and the olefin- ⁇ .
  • the aqueous heat sealant of the present invention can be obtained by a method of further adding to an aqueous dispersion with a ⁇ -unsaturated carboxylic acid copolymer.
  • the heat sealant of the present invention includes silica, alumina, defoaming agent, viscosity regulator, leveling agent, tackifier, preservative, antibacterial agent, and antibacterial agent as long as the object of the present invention is not impaired. Additives such as rust agents, antioxidants, and silicone oils may be blended. Further, in the aqueous heat sealant of the present invention, a polymer-based defoaming agent, a silicone-based defoaming agent, and a fluorine-based defoaming agent are preferably used in order to prevent foaming when coating with various coaters. ..
  • both emulsified dispersion type and solubilized type can be used.
  • polymer-based defoamers are preferable.
  • the amount of the defoaming agent added is preferably 0.005% by weight to 0.1% by weight of the total amount of the aqueous heat sealant.
  • the water-based heat sealant of the present invention can be used as a heat sealant when manufacturing a paper container, and the coated portion other than the seal (adhesive) portion functions as a coating agent for imparting waterproofness to the paper. do.
  • the water-based heat sealant of the present invention can be easily softened by heating with a burner or hot air to bond papers or paper to other materials, and then cooled to solidify the bonded portion to solidify the papers or paper. And other materials can be firmly sealed.
  • Examples of the material that can be adhered (sealed) by the water-based heat sealant of the present invention include paper, non-woven fabric, and plastic, but paper is preferable.
  • the paper used in the present invention is produced by a known paper machine using natural fibers for papermaking such as wood pulp, but the papermaking conditions are not particularly specified.
  • Examples of natural fibers for papermaking include wood pulp such as softwood pulp and broadleaf pulp, non-wood pulp such as Manila hemp pulp, sisal hemp pulp, and flax pulp, and pulp obtained by chemically modifying these pulps.
  • thermomechanical pulp and the like obtained by a sulfate cooking method, an acidic / neutral / alkaline sulfite cooking method, a soda salt cooking method and the like can be used.
  • the type, thickness, and the like of the paper can be sequentially selected according to the purpose.
  • the paper base material for example, for burger wrap, it is about 20 g / m 2 for paper density, for paper cups it is 200 to 300 g / m 2 , and for paper plates, paper spoons, paper madler, etc., it is 50 to 500 for paper density.
  • Food base paper such as gram / m 2 cup base paper is preferred. From the viewpoint of recycling efficiency and cost reduction, it is preferable that these papers are not laminated with polyethylene-film, aluminum or the like.
  • the water-based heat sealant of the present invention has a function as an adhesive that adheres two parts of a paper base material in a superposed state. Specifically, at least one of the two parts of the paper substrate (which may be both parts) is coated with the aqueous heat sealant of the present invention and then softened by heating.
  • a known method can be used as the coating method of the aqueous heat sealant of the present invention.
  • Machines can be used.
  • a drying step may be provided in an oven or the like after coating.
  • a heat source such as a burner, hot air, electric heat, infrared rays, an electron beam, or other conventionally known means can be used. Specifically, depending on the method of heating with a burner or hot air, or the form of molding. A heat welding sealing method, an ultrasonic sealing method, or a high frequency sealing method is preferable.
  • the heating temperature at this time is preferably 200 to 500 ° C., and the heating time is preferably 0.1 to 3 seconds.
  • the water-based heat sealant of the present invention can be easily heated and softened even by non-contact heating, and to some extent even if it is separated from the heat source, in addition to the method of directly contacting with a heat source such as a heat seal bar to melt it.
  • the heat seal function lasts for a long time.
  • the base material is paper
  • the paper may be burnt if it is brought into direct contact with a heat source. It is particularly useful as a heat sealant for industrial production of paper containers that require line speed.
  • the thickness of the solid content after coating the aqueous heat sealant of the present invention may be a desired thickness.
  • the thickness is in the range of 2 to 12 g / m 2.
  • the effect of the invention can be sufficiently obtained. Above all, the range is more preferably 5 to 10 g / m 2.
  • the coated portion and the other portion are pressure-bonded in a superposed state.
  • the crimping method is not particularly limited, and a hot plate method, an ultrasonic seal, or a high frequency seal can be used.
  • the film thickness of the solid content after coating on the coated surface may be a desired film thickness, and is used, for example, in a paper container for food.
  • the effect of the present invention can be sufficiently obtained if the range is 2 to 12 g / m 2. Above all, the range is more preferably 5 to 10 g / m 2.
  • the aqueous heat sealant of the present invention When used as a coating agent for paper, it should be coated to a desired film thickness by the above-mentioned coating method, and then dried by a drying method such as heat drying or room temperature drying. Just do it.
  • Paper containers that can use the water-based heat sealant of the present invention include paper cups, cup noodles, various beverages, desserts such as ice cream, pudding, and jelly, snacks such as rice confectionery, potato chips, chocolate confectionery, and biscuits, hamburgers, and hot foods. It is widely used for wrapping paper in docks, take-out containers such as pizza, hot snack containers such as fried chicken and potatoes, and food paper containers such as cups for delicatessen such as natto.
  • a cylinder made of a paper base material in which a resin layer is provided at least on the inner surface of the container and the bonding surface when assembling the container, and the bonding surfaces at both ends of the paper base material are rolled and overlapped by heat welding.
  • Shaped body member (1) and Paper having at least a paper base material having a resin layer provided on the inner surface of the container and the bonding surface when assembling the container, and having a plate-shaped bottom member (2) heat-welded to the lower end of the body member (1). The method of manufacturing the container will be described.
  • Both the tubular body member (1) and the plate-shaped bottom member (2) are made by cutting out a paper base material provided with a resin layer into a desired shape, and the resin layer is heat-sealed according to the present invention. Use an agent.
  • the heat sealant of the present invention is applied to at least the bonded surface of the paper base material, preferably the entire surface.
  • the coating method the above-mentioned coating method can be appropriately used.
  • the aqueous solvent on the surface coated with the heat sealant is removed with a dryer or the like, and then printing is performed as necessary. Printing is often applied to the side opposite to the heat sealant.
  • the tubular body member (1) is cut out in a fan shape, and the plate-shaped bottom member (2) is cut out in a circular shape.
  • the bonded surfaces at both ends of the fan-shaped tubular body member (1) are heated with a heat source such as a burner or hot air to soften the heat sealant, and the bonded surfaces are overlapped and crimped.
  • the order of heating, superimposition, and crimping is not particularly limited.
  • the bonded surfaces may be heated with a heat source and then overlapped with each other, and then crimped, or the bonded surfaces may be overlapped with each other and then heated with a heat source. It may be crimped, or it may be heated by a heat source while crimping after overlapping the bonded surfaces.
  • a method in which the bonded surfaces are heated by a heat source, the surfaces are overlapped with each other, and then pressure-bonded is preferable because the heat sealant is surely heated and softened.
  • the heating temperature at this time is preferably 200 to 500 ° C., and the heating time is preferably 0.1 to 3 seconds.
  • a tubular body member having the heat sealant coated surface inside can be obtained.
  • a machine called a blanker that punches the paper base material into a fan shape may be used, and a blank (body portion) of the paper container can be produced.
  • the bottom member (2) cut out in a circular shape is installed inside the tubular body member so that the surface coated with the heat sealant is inside the cup, and then the bottom member and the body member come into contact with each other.
  • the portion is heated with a heat source to soften and bond the heat sealant on the bottom member side and the body member side in the same manner as described above.
  • the heat sealant softens and fills the gap between the bottom member and the body member, so that water leakage or the like does not occur.
  • a paper cup can be obtained by a known process, for example, a method in which the lower end of the bottom side of the body member is folded inward and crimped with a rotating circular mold to finish the bottom of the paper cup.
  • the heat-sealed portion may be heated by the above-mentioned heat source in order to strengthen the connection between the body member and the bottom member, if necessary.
  • the portion corresponding to the spout at the upper end of the body member is subjected to a molding process called curling, in which the tool is rolled around the outside of the paper cup as needed.
  • the paper container of the specific embodiment is mainly a cup-shaped container having a disk-shaped bottom member, but the shape is not limited to this, for example, a rectangular parallelepiped or polygonal bottom member having a rectangular plate shape. Alternatively, it may be a cube-shaped container. Further, if necessary, the container is sealed with a separately manufactured lid material or the like, and for example, when heating in a microwave oven or the like, the lid material is removed or a part of the container is opened and used. May be good.
  • ⁇ Method for producing olefin- ⁇ , ⁇ unsaturated carboxylic acid copolymer> (Manufacturing Example 1) 77.8 parts of ethylene, 11.1 parts of ethyl acrylate, and 11.2 parts of acrylic acid were synthesized by a conventional method to obtain an ethyl acrylate copolymer of ethylene acrylate. Twenty-five parts of the obtained copolymer, ammonia having a neutralization rate of 100% with respect to the acid value of the copolymer, and water as an aqueous solvent were charged and stirred to form both olefin- ⁇ and ⁇ unsaturated carboxylic acids. An aqueous dispersion (A1) of the copolymer was obtained.
  • the aqueous heat sealant of Example or Comparative Example was applied to a cup base paper (manufactured by Nippon Paper Industries, Ltd.) using bar coater # 16, and then dried at 100 ° C. for 30 seconds. After that, the coated paper was cut into 3.0 cm ⁇ 5.0 cm to obtain a test piece. Several sheets were placed on top of each other so that the coated surface and the non-coated surface of the test piece were in contact with each other, and a sample was taken from only the upper one, and the behavior of the test piece at that time was visually confirmed. 4: When the test pieces are stacked, the test pieces can be taken one by one. 3: There is a behavior that the lower test piece is attached to the upper test piece very slightly. 2: Occasionally, there is a behavior that the lower test piece is attached to the upper test piece. 1: The lower test piece is attached to the upper test piece.
  • Blocking resistance (Blocking resistance) (Blocking resistance)
  • the coated surface and the non-coated surface of the coated paper prepared by the evaluation of heat sealability are overlapped so as to be in contact with each other, a load of 10 kgf / cm 2 is applied, and the paper is allowed to pass for 48 hours in an environment of 40 ° C., and then coated after being taken out.
  • the degree of adhesion between the work surface and the uncoated surface was visually evaluated in the following four stages. (Evaluation criteria) 4: No blocking is seen. 3: Partial blocking is seen. 2: Partial blocking is seen. 1: Blocking is seen over the entire surface.
  • Tables 1 and 2 show the evaluation results of each of the laminated bodies of Examples 1 to 8 and Comparative Examples 1 to 7.
  • Styrene-acrylic resin Neocryl A-2095 (Kusumoto Kasei Co., Ltd.) Carnauba wax: MICROKLEAR 418 (Micro Powerers, Inc.) Fisher Trofish Wax (a): MP-22XF (Micro Powerers, Inc.) Fisher Trofish Wax (b): MP-28C (Micro Powerers, Inc.) Fine powder polyethylene: Frosen uF1.5N (Sumitomo Seika Chemical Co., Ltd.)

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  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Wrappers (AREA)
  • Adhesives Or Adhesive Processes (AREA)
  • Laminated Bodies (AREA)
  • Compositions Of Macromolecular Compounds (AREA)
PCT/JP2021/000944 2020-01-27 2021-01-14 水性ヒートシール剤、紙容器用紙基材、紙容器、及び紙容器の製造方法 WO2021153240A1 (ja)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2023058188A (ja) * 2021-10-13 2023-04-25 東洋インキＳｃホールディングス株式会社 ヒートシール積層体の製造方法
WO2023139981A1 (ja) * 2022-01-24 2023-07-27 サカタインクス株式会社 積層体の製造方法
JP2023135149A (ja) * 2022-03-15 2023-09-28 三井化学株式会社 分散体、接着剤組成物、積層体、および、分散体の製造方法

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2024095312A1 (ja) * 2022-10-31 2024-05-10 日本たばこ産業株式会社 カートリッジ及びこれを備えたエアロゾル生成装置

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5336528A (en) * 1993-01-15 1994-08-09 James River Paper Company, Inc. Heat sealable paper and method for its manufacture
JP2000007860A (ja) * 1998-06-23 2000-01-11 Sumitomo Seika Chem Co Ltd エチレン系樹脂水性分散液、およびその水性分散液から得られるエチレン系樹脂皮膜
JP2001122238A (ja) * 1999-10-28 2001-05-08 Goyo Paper Working Co Ltd 紙容器及びその製造方法
JP2006045313A (ja) * 2004-08-03 2006-02-16 Unitika Ltd 水性分散体および水性ヒートシール剤
JP6794089B1 (ja) * 2019-04-01 2020-12-02 Ｄｉｃグラフィックス株式会社 紙用オーバーコーティング用及び接着剤用組成物、並びに該組成物を用いた塗工物、耐水耐油紙積層体、紙ストロー及び紙製食器

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE746404A (fr) * 1969-02-24 1970-08-24 Du Pont Copolymeres d'ethylene pour emulsionner des dispersions aqueuses
JP2568583B2 (ja) * 1987-10-05 1997-01-08 中央理化工業株式会社 低温ヒートシール性積層シートの製造法
CN1215115C (zh) * 2001-01-15 2005-08-17 尤尼吉可株式会社 聚烯烃树脂水性分散体
JP2006131882A (ja) * 2004-10-06 2006-05-25 Unitika Ltd 水性分散体、塗膜および積層体
JP2007210640A (ja) * 2006-02-09 2007-08-23 Dainippon Printing Co Ltd プルタブ、該プルタブを有する紙容器および紙容器入り飲料
JP2007210639A (ja) * 2006-02-09 2007-08-23 Dainippon Printing Co Ltd 紙カップ
CN105722894A (zh) * 2013-12-04 2016-06-29 尤尼吉可株式会社 聚烯烃树脂水性分散体

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5336528A (en) * 1993-01-15 1994-08-09 James River Paper Company, Inc. Heat sealable paper and method for its manufacture
JP2000007860A (ja) * 1998-06-23 2000-01-11 Sumitomo Seika Chem Co Ltd エチレン系樹脂水性分散液、およびその水性分散液から得られるエチレン系樹脂皮膜
JP2001122238A (ja) * 1999-10-28 2001-05-08 Goyo Paper Working Co Ltd 紙容器及びその製造方法
JP2006045313A (ja) * 2004-08-03 2006-02-16 Unitika Ltd 水性分散体および水性ヒートシール剤
JP6794089B1 (ja) * 2019-04-01 2020-12-02 Ｄｉｃグラフィックス株式会社 紙用オーバーコーティング用及び接着剤用組成物、並びに該組成物を用いた塗工物、耐水耐油紙積層体、紙ストロー及び紙製食器

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2023058188A (ja) * 2021-10-13 2023-04-25 東洋インキＳｃホールディングス株式会社 ヒートシール積層体の製造方法
WO2023139981A1 (ja) * 2022-01-24 2023-07-27 サカタインクス株式会社 積層体の製造方法
JP2023135149A (ja) * 2022-03-15 2023-09-28 三井化学株式会社 分散体、接着剤組成物、積層体、および、分散体の製造方法

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