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
  • 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
  • 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
  • D21H15/00—Pulp or paper, comprising fibres or web-forming material characterised by features other than their chemical constitution
  • D21H15/02—Pulp or paper, comprising fibres or web-forming material characterised by features other than their chemical constitution characterised by configuration
• • 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
  • D21H19/36—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
  • D21H19/80—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
  • D21H19/84—Paper comprising more than one coating on both sides of the substrate
• • 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
  • D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
  • D21H21/14—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties characterised by function or properties in or on the paper
  • D21H21/18—Reinforcing agents
• • 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

Definitions

• LLKP hardwood bleached kraft pulp
• NKP softwood bleached kraft pulp
• a numerical range represented by "X to Y” means a numerical range including X as the lower limit and Y as the upper limit.
• X to Y means a numerical range including X as the lower limit and Y as the upper limit.
• Y means a numerical range including X as the lower limit and Y as the upper limit.
• (meth)acrylic is a generic term including both acrylic and methacrylic.
• the pulp raw material constituting the paper base material contains at least one selected from the group consisting of LBKP and NBKP, it is more preferable that it contains at least LBKP and further contains NBKP, and it is even more preferable that LBKP and NBKP are used in combination.
• wet strength agent examples include polyamide polyamine epichlorohydrin resin (PAE), melamine-formaldehyde resin, and urea-formaldehyde resin, and among these, polyamide polyamine epichlorohydrin resin is preferred.
• PAE polyamide polyamine epichlorohydrin resin
• melamine-formaldehyde resin melamine-formaldehyde resin
• urea-formaldehyde resin examples include polyamide polyamine epichlorohydrin resin (PAE), melamine-formaldehyde resin, and urea-formaldehyde resin, and among these, polyamide polyamine epichlorohydrin resin is preferred.
• PAE polyamide polyamine epichlorohydrin resin
• melamine-formaldehyde resin melamine-formaldehyde resin
• urea-formaldehyde resin urea-formaldehyde resin
• the wet strength agent may be contained in some of the layers
• the content of the alkyl ketene dimer in the internal sizing agent is preferably 10% by mass or less, more preferably 7% by mass or less, even more preferably 4% by mass or less, and even more preferably 0% by mass.
• the content of the internal sizing agent relative to 100 parts by mass of the raw material pulp is preferably 0.1 part by mass or more and 5 parts by mass or less, more preferably 0.3 part by mass or more, even more preferably 0.5 part by mass or more, and more preferably 3 parts by mass or less, even more preferably 1 part by mass or less.
• Papermaking from the stock can be carried out by a standard method.
• the stock can be cast onto a wire or the like, dehydrated to obtain a wet paper, and multiple wet papers can be stacked as necessary, and this single-layer or multi-layer wet paper can be pressed and dried.
• this single-layer or multi-layer wet paper can be pressed and dried.
• an adhesive can be applied to the surface of the wet paper (the surface on which other wet papers are stacked).
• the obtained paper base material may have a difference in smoothness between one side and the other side, and in this embodiment, from the viewpoint of obtaining a waterproof paper with excellent water resistance, air permeability, and oil resistance, it is preferable to provide the undercoat layer 1 and the waterproof layer 1 in that order on the smoother side of the paper base material to serve as the liquid-contacting surface (surface).
• the waterproof paper of this embodiment has an undercoat layer 1 and a waterproof layer 1 in this order from the paper substrate side on one side of the paper substrate, for example, the liquid-contacting surface (front surface).
• the liquid-contacting surface is the surface that comes into contact with a liquid, and for example, when the waterproof paper is used for a packaging container, it means the surface that comes into contact with the contents. In this case, the contents may be either liquid or non-liquid.
• the undercoat layer 1 preferably contains latex and a pigment.
• the waterproof paper of this embodiment may have at least one of an undercoat layer 2 and a water-resistant layer 2 on the other surface of the paper substrate, for example the surface opposite to the liquid-contacting surface (printing surface, back surface), and may have an undercoat layer 2 and a water-resistant layer 2 in this order from the paper substrate side, or may have the water-resistant layer 2 without an undercoat layer 2.
• the paper substrate may be exposed on the other surface of the paper substrate.
• the undercoat layer 1 By having the undercoat layer 1 on the surface, water-resistant paper with better water resistance can be obtained. In addition, when the back surface has the undercoat layer 2, the printability is improved. On the surface, the undercoat layer 1 is provided between the paper substrate and the water-resistant layer 1. When the back surface has the undercoat layer 2, the water-resistant layer 2 may be laminated on the undercoat layer 2, or the water-resistant layer 2 may not be laminated. In addition, the water-resistant paper of this embodiment only needs to have the undercoat layer 1 on at least one surface (liquid-contacting surface), and the other surface (printing surface, back surface) may not have the undercoat layer 2.
• the latex are not particularly limited as long as the effects of the present invention are exhibited, and include, for example, conjugated diene polymers such as styrene-butadiene copolymers and acrylonitrile-butadiene copolymers; acrylic polymers such as homopolymers of (meth)acrylic acid esters and copolymers of monomers copolymerizable therewith (for example, styrene-acrylic copolymers, methyl methacrylate-butadiene copolymers); vinyl polymers such as ethylene-vinyl acetate copolymers and vinyl chloride-vinyl acetate; polyurethane resins; and natural rubber. These may be used alone or in combination of two or more.
• conjugated diene polymers such as styrene-butadiene copolymers and acrylonitrile-butadiene copolymers
• acrylic polymers such as homopolymers of (meth)acrylic acid esters and copo
• the glass transition temperature of the latex is not particularly limited, but from the viewpoint of the adhesive strength between the water-resistant layer and the undercoat layer, it is preferably -50°C or higher and 60°C or lower, more preferably -20°C or higher, even more preferably 0°C or higher, and more preferably 40°C or lower.
• the glass transition temperature of the latex is measured by differential scanning calorimetry (DSC).
• the mass ratio of calcium carbonate to kaolin is not particularly limited, but is preferably 50/50 or more and 90/10 or less, more preferably 60/40 or more and 80/20 or less.
• the undercoat layer may further contain components other than the latex and pigment.
• other components include adhesives, dispersants, thickeners, water retention agents, defoamers, water-resistant agents, colorants, surfactants, etc.
• adhesives include proteins such as casein, soy protein, and synthetic protein; starches such as oxidized starch, cationic starch, urea phosphate esterified starch, etherified starch such as hydroxyethyl etherified starch, and dextrin; and cellulose derivatives such as carboxymethyl cellulose, hydroxyethyl cellulose, and hydroxymethyl cellulose.
• the basis weight of the laminate of the paper base material and the undercoat layer (hereinafter also referred to as "undercoat paper") is not particularly limited, but for example, for packaging containers, preferably paper cups, it is preferably 200 g/m 2 or more and 450 g/m 2 or less, more preferably 220 g/m 2 or more, even more preferably 240 g/m 2 or more, more preferably 400 g/m 2 or less, even more preferably 350 g/m 2 or less, and even more preferably 300 g/m 2 or less.
• the waterproof paper of this embodiment has a waterproof layer 1 on one surface (eg, the liquid-contacting surface) of a paper substrate.
• the waterproof layer 1 is formed on the paper base material via the undercoat layer 1.
• the waterproof layer is preferably provided as the uppermost layer on at least one surface of the paper base material, and more preferably provided as the uppermost layer on at least the liquid-contacting surface.
• the waterproof paper of this embodiment has one or more waterproof layers on at least one side of the paper base material, and may have two or more waterproof layers on at least one side. From the viewpoint of productivity, it is preferable that the waterproof layer is one layer, and from the viewpoint of improving the waterproofness, it is preferable that the waterproof layer is two or more layers.
• the water-resistant layer needs to be provided at least on the liquid-contacting surface (hereinafter, the liquid-contacting surface is also referred to as the front surface), and may also be provided on the opposite surface, that is, the back surface, via the paper base material.
• the outer surface (the surface opposite to the liquid-contacting surface, also called the back surface or the printed surface) has one or more water-resistant layers, and it may have two or more layers. That is, the water-resistant paper of this embodiment preferably has water-resistant layers on both sides of the paper base material, and preferably has water-resistant layer 2 on the other surface of the paper base material.
• the composition and coating amount of each water-resistant layer may be the same or different, and when the paper base material has water-resistant layers on one side and the other side, the composition and coating amount of each water-resistant layer may be the same or different.
• water-resistant layer 1 or “water-resistant layer 2" refers collectively to the water-resistant layer 1 and the water-resistant layer 2.
• the water-resistant layer preferably contains a water-based resin.
• water-based resin is meant a resin that can be dispersed or suspended in water.
• the aqueous resin include polyolefin resins and acrylic resins, and examples thereof include ethylene-(meth)acrylic acid copolymers, styrene-acrylic copolymers, and ethylene- ⁇ -olefin copolymers.
• the carbon number of the ⁇ -olefin is preferably 4 or more and 20 or less, more preferably 6 or more and 16 or less, and even more preferably 6 or more and 12 or less.
• aqueous resins may be used alone or in combination of two or more kinds.
• the water-resistant layers on both surfaces contain the same type of aqueous resin.
• the aqueous resins on the front surface and the back surface are the same type, the heat sealability tends to be improved. Therefore, for example, when the water-resistant layer on the front side contains an ethylene-(meth)acrylic acid copolymer as an aqueous resin and the back side has a water-resistant layer, it is preferable that the water-resistant layer on the back side contains an ethylene-(meth)acrylic acid copolymer as an aqueous resin.
• the water-resistant layers on both sides may contain different types of water-based resins, but from the viewpoint of heat sealability, it is preferable that the polarities of the resins are similar.
• the ethylene-(meth)acrylic acid copolymer may be an ethylene-acrylic acid copolymer or an ethylene-methacrylic acid copolymer
• the styrene-acrylic copolymer may be a styrene-(meth)acrylic acid alkyl ester copolymer.
• water-based resin commercially available products may be used, for example, AQUENCE EPIX BC 9220HS manufactured by Henkel Japan Ltd., MP498345N, MP4983R, MP4990R, 201103PX manufactured by Michaelman Japan LLC.
• Examples of such a surfactant include S, MFHS1279, ZAIKXEN (registered trademark) A and ZAIKXEN (registered trademark) AC manufactured by Sumitomo Seika Chemicals Co., Ltd., the Chemipearl series (S100, S300, S500) manufactured by Mitsui Chemicals, Inc., MYE-30ER and MYE-30MAZ manufactured by Maruyoshi Chemical Co., Ltd., the Surlyn series manufactured by DuPont, the Hi-Milan series manufactured by Mitsui-Dow Polychemicals Co., Ltd., HYPOD2000, RHOBAR R320, and RHOBAR R325 manufactured by Dow Chemical Japan Co., Ltd., Hi-Tec SC-100 manufactured by Toho Chemical Industry Co., Ltd., AQUATEX AC-3100 manufactured by Chuo Rika Kogyo Co., Ltd., AQUENCE EPIX BC900F, BC905F, and BC910F manufactured by Henkel Japan, and Jon
• the ethylene-(meth)acrylic acid copolymer blended in the coating liquid for the water-resistant layer may be in the form of an ionomer.
• the ionomer is a copolymer neutralized with a cation.
• ethylene-methacrylic acid copolymers and synthetic resins obtained by neutralizing ethylene-acrylic acid copolymers with a cation all fall under the category of ionomers.
• the ionomers may be used alone or in combination of two or more types. Examples of cations include metal ions such as sodium ions, potassium ions, calcium ions, and magnesium ions, ammonium ions (NH 4 + ), and organic ammonium ions.
• the method for applying the coating solution for the water-resistant layer is not particularly limited, and may be appropriately selected from commonly used coating devices, such as an air knife coater, a blade coater, a gravure coater, a rod blade coater, a roll coater, a reverse roll coater, a bar coater, a curtain coater, a die slot coater, a champlex coater, a metering blade type size press coater, a short dwell coater, a spray coater, a gate roll coater, and a lip coater.
• an air knife coater from the viewpoint of improving the quality of the water-resistant layer.
• the coating amount of the water-resistant layer 1 is preferably 5 g/ m2 or more and 20 g/ m2 or less, more preferably 6 g/ m2 or more, even more preferably 7 g/ m2 or more, and more preferably 15 g/ m2 or less, even more preferably 12 g/ m2 or less.
• the coating amount of the water-resistant layer 1 is preferably equal to or more than the above-mentioned lower limit from the viewpoint of improving water resistance and oil resistance, and is preferably equal to or less than the above-mentioned upper limit from the viewpoints of formability, cost, and recyclability.
• the coating amount of the water-resistant layer 1 refers to the total coating amount thereof.
• the total coating amount of the water-resistant layers 1 and 2 i.e., the total coating amount of the water-resistant layers on the front and back sides, is, from the viewpoints of water resistance, air permeability, and oil resistance, preferably from 6 g/m2 to 20 g/ m2 , more preferably from 7 g/ m2 or more, even more preferably from 7.5 g/ m2 or more, and more preferably from 17 g/ m2 or less, even more preferably from 14 g/ m2 or less.
• the waterproof paper of this embodiment is used for a packaging container (preferably a food container, e.g., a paper cup), and has a water-resistant layer on both sides (the liquid-contacting side and the printed side), it is preferable that the total coating amount of the waterproof layer on the liquid-contacting side and the total coating amount of the waterproof layer on the printed side are each within the above range, and it is also preferable that the total coating amount of the waterproof layer on both sides is within the above range.
• the water-resistant paper of the present embodiment may have other layers in addition to the above undercoat layer and water-resistant layer.
• Examples of other layers include a printed layer, a water vapor barrier layer, an oxygen barrier layer, an oxygen absorbing layer, and an adhesion-imparting layer.
• the printed layer may be formed using a known ink such as an oil-based ink, a water-based ink, or a biomass ink.
• the printed layer may be formed on one side of the water-resistant paper, or on a part of the surface. That is, the water-resistant paper of the present embodiment may be printed on all or part of at least one side (e.g., the printed surface).
• the printed content may be a pattern, a design, or information (ingredients, expiration date, QR code (registered trademark), etc.).
• the water-resistant layer 1 may be provided on one side (liquid-contacting surface) of the paper substrate, and the paper substrate may be exposed on the other side (printed surface, back surface) of the paper substrate, but the heat sealability (side sealability) may be poor when forming the body of the paper cup. Therefore, from the viewpoint of improving heat sealability (side sealability), an adhesion-imparting layer may be provided on the other surface (printed surface, back surface) of the paper substrate.
• the adhesion-imparting layer can be formed using a known resin such as an olefin resin, a vinyl alcohol-based resin, an amide-based resin, or an amine-based resin.
• the water-resistant paper of this embodiment preferably has, on at least one side of the paper substrate, one or more layers (preferably only one layer) of undercoat layer provided so as to be in direct contact with the paper substrate, and one or more layers (preferably only one layer) of water-resistant layer provided so as to be in direct contact with the undercoat layer, in this order, and more preferably is composed of only the paper substrate, undercoat layer, and water-resistant layer.
• the other side is not particularly limited, but for example, in the case of a paper cup for cold beverages, it is preferable to have, in this order, one or more layers (preferably only one layer) of undercoat layer provided so as to be in direct contact with the paper substrate, and one or more layers (preferably only one layer) of water-resistant layer provided so as to be in direct contact with the undercoat layer, and in the case of a paper cup for hot beverages, it may have one or more layers (preferably only one layer) of undercoat layer provided so as to be in direct contact with the paper substrate.
• the basis weight of the waterproof paper is not particularly limited, but for example, in the case of applications such as packaging containers, preferably food containers, and more preferably paper cups, it is preferably 220 g/ m2 or more and 500 g/ m2 or less, more preferably 240 g/ m2 or more, even more preferably 250 g/ m2 or more, and more preferably 450 g/ m2 or less, even more preferably 400 g/ m2 or less, still more preferably 350 g/ m2 or less, and even more preferably 300 g/ m2 or less.
• the density of the waterproof paper is not particularly limited, but for example, in the case of a packaging container, preferably a paper cup, from the viewpoint of obtaining paper strength as a packaging container and flexibility during molding, it is preferably 0.4 g/ cm3 or more and 1.1 g/ cm3 or less, more preferably 0.6 g/ cm3 or more, even more preferably 0.7 g/ cm3 or more, and more preferably 1.0 g/ cm3 or less, even more preferably 0.95 g/ cm3 or less.
• the density of the waterproof paper is calculated from the basis weight and thickness of the waterproof paper obtained by the above-mentioned measurement method.
• the edge wick value in water at 20°C after a contact time of 60 minutes is preferably 0.70 g/1000 mm2 or less, more preferably 0.60 g/1000 mm2 or less, even more preferably 0.50 g/1000 mm2 or less, and even more preferably 0.40 g/1000 mm2 or less .
• the lower limit of the edge wick value in water at 20°C is not particularly limited, but from the viewpoint of ease of production, it is, for example, 0.10 g/1000 mm2 or more .
• the edge wick value in cold water can be adjusted within a desired range depending on the type and amount of sizing agent, the type and amount of wet paper strength agent, and the like.
• the edge wick value is a value measured in accordance with JIS P 8118:2014.
• the edge wick value in hot water can be adjusted within a desired range depending on the type and amount of sizing agent, the type and amount of wet paper strength agent, etc.
• the edge wick value is adopted as a value measured in accordance with JIS P 8118: 2014.
• the water-resistant paper of this embodiment has a kit value of 10 or more, preferably 11 or more (maximum value 12) on the side having the water-resistant layer 1, measured according to JAPAN TAPPI No. 41 (kit method).
• kit method JAPAN TAPPI No. 41
• the larger the kit value the better the oil resistance. If the kit value is 10 or more, it can be suitably used for food packaging applications.
• the kit value of the water-resistant paper can be adjusted within a desired range by the average Runkel ratio of the pulp constituting the paper base material, the type of resin used in the water-resistant layer 1 and the coating amount of the water-resistant layer 1, the type of pigment used in the undercoat layer 1 and the amount of latex, the coating amount of the undercoat layer 1, etc.
• the Oken smoothness is 80 seconds or more, preferably 90 seconds or more, and more preferably 100 seconds or more on the side having the waterproof layer 1.
• the Oken smoothness of the surface of the water-resistant paper having the water-resistant layer 1 can be adjusted within a desired range by the average Runkel ratio of the pulp constituting the paper base material, the type of resin used in the water-resistant layer 1 and the coating amount of the water-resistant layer 1, the type of pigment and the amount of latex used in the undercoat layer 1, the coating amount of the undercoat layer 1, etc.
• the Oken smoothness of the water-resistant paper is a value measured in accordance with JIS P 8155:2010.
• the Oken air permeability can be adjusted within a desired range by the average Runkel ratio of the pulp constituting the paper base material, the type of resin used in the water-resistant layer 1 and the coating amount of the water-resistant layer 1, the type of pigment used in the undercoat layer 1 and the amount of latex, the coating amount of the undercoat layer 1, and the like.
• the Oken air permeability is a value measured in accordance with JIS P 8117:2009.
• Example 6 A waterproof paper was obtained in the same manner as in Example 1, except that the coating liquids for the waterproof layers 1 and 2 were changed to the coating liquid C.

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• Chemical Kinetics & Catalysis (AREA)
• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
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• Laminated Bodies (AREA)

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Citations (5)

• 2023
  • 2023-12-26 JP JP2024567881A patent/JPWO2024143392A1/ja active Pending
  • 2023-12-26 WO PCT/JP2023/046720 patent/WO2024143392A1/ja not_active Ceased

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