[go: up one dir, main page]

WO2024190610A1 - Papier résistant à l'huile, matériau d'emballage et emballage - Google Patents

Papier résistant à l'huile, matériau d'emballage et emballage Download PDF

Info

Publication number
WO2024190610A1
WO2024190610A1 PCT/JP2024/008795 JP2024008795W WO2024190610A1 WO 2024190610 A1 WO2024190610 A1 WO 2024190610A1 JP 2024008795 W JP2024008795 W JP 2024008795W WO 2024190610 A1 WO2024190610 A1 WO 2024190610A1
Authority
WO
WIPO (PCT)
Prior art keywords
paper
resistant
mass
grease
oil
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.)
Pending
Application number
PCT/JP2024/008795
Other languages
English (en)
Japanese (ja)
Inventor
達也 松本
一行 阿部
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.)
Oji Holdings Corp
Original Assignee
Oji Holdings Corp
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 Oji Holdings Corp filed Critical Oji Holdings Corp
Priority to JP2025506773A priority Critical patent/JPWO2024190610A1/ja
Publication of WO2024190610A1 publication Critical patent/WO2024190610A1/fr
Anticipated expiration legal-status Critical
Pending legal-status Critical Current

Links

Classifications

    • 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
    • D21H19/10—Coatings without pigments
    • 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

Definitions

  • the present invention relates to greaseproof paper, packaging materials and packages. This application claims priority based on Japanese Patent Application No. 2023-040776, filed on March 15, 2023, the contents of which are incorporated herein by reference.
  • Greaseproof paper which is made resistant to oil using an oil-resistant agent, is used for packaging food and other items.
  • fluorine-based greaseproof paper using fluorine-based greaseproof agents was widely used, but in recent years, with consideration for the environment and safety, non-fluorine-based greaseproof paper using non-fluorine-based greaseproof agents has come to be used.
  • Patent documents 1 and 2 propose greaseproof paper using hydrophobic starch.
  • Non-fluorine-based oil-resistant agents do not repel oil like fluorine-based oil-resistant agents, but form a coating layer on the paper to physically prevent oil from entering. Therefore, conventional non-fluorine-based grease-resistant papers generally have a high air permeability (air resistance) and cannot let steam escape, which makes them unsuitable for bags for fried foods.
  • the grease-resistant paper of Patent Document 1 also requires a large amount of coating to achieve sufficient oil resistance, which causes the same problem.
  • a coating layer is provided with a coating weight of 0.5 to 20 g/m 2 by using a combination of hydrophobized starch, a crosslinking agent, and a fatty acid.
  • the greaseproof paper in Patent Document 2 may not have sufficient oil resistance, particularly resistance to high-temperature (e.g., 180°C) oil (high-temperature oil resistance).
  • the present invention aims to provide greaseproof paper and packaging material with low air permeability and excellent high-temperature oil resistance, as well as packaging using this packaging material.
  • An oil-resistant paper having a paper base material mainly composed of pulp and an oil-resistant composition containing a hydrophobized starch adhered to the paper base material, wherein at least a part of the oil-resistant composition is impregnated into the paper base material;
  • the total content of the crosslinking agent, the fatty acid, the fatty acid salt and the modified fatty acid is 0.8% by mass or less based on the mass of the grease-resistant paper;
  • Grease-resistant paper having an air permeability of 30,000 seconds or less.
  • the oil-resistant paper according to any one of [1] to [7], wherein either or both of the paper base material and the oil-resistant composition contain the crosslinking agent.
  • a packaging material comprising the greaseproof paper according to any one of [1] to [9].
  • the present invention provides greaseproof paper and packaging material with low air permeability and excellent high-temperature oil resistance, as well as packaging using this packaging material.
  • the grease-resistant paper has a paper substrate and an grease-resistant composition attached to the paper substrate.
  • the paper substrate is mainly composed of pulp.
  • the grease-resistant composition includes hydrophobized starch.
  • the paper base material and the oil-proofing composition may each contain at least one selected from the group consisting of a crosslinking agent, a fatty acid, a fatty acid salt, and a modified fatty acid (hereinafter, these are collectively referred to as "additive A"). Additive A, the paper base material and the oil-proofing composition will be described in detail later.
  • the greaseproof paper at least a part of the greaseproofing composition is impregnated into the paper substrate. That is, at least a part of the greaseproofing composition is located inside the surface of the paper substrate. Although a part of the greaseproofing composition may be located on the surface of the paper substrate, not all of the greaseproofing composition is located on the surface of the paper substrate. If the entire oil-proofing composition is located on the surface of the paper substrate, the surface of the paper substrate would be covered with a layer of the oil-proofing composition, which could impair the low air permeability of the paper substrate. By impregnating at least a portion of the oil-proofing composition into the paper substrate, the low air permeability of the paper substrate is less likely to be impaired.
  • the greaseproof paper in which at least a part of the greaseproofing composition is impregnated into the paper substrate is typically obtained by applying a coating liquid containing the greaseproofing composition and water to the paper substrate, followed by drying. Details will be described later.
  • the oil-proofing composition corresponds to the solid content of the coating liquid and does not contain water.
  • the amount of the oil-resistant composition attached to the grease-resistant paper is preferably 1 to 20 g/ m2 , more preferably 1 to 10 g/ m2 , and even more preferably 2 to 6 g/ m2 , calculated as the mass of hydrophobized starch derived from the oil-resistant composition per m2 of the grease-resistant paper.
  • the amount of the oil-resistant composition attached in terms of hydrophobized starch is equal to or more than the above lower limit, the oil resistance improving effect of the oil-resistant composition is fully exhibited, and when it is equal to or less than the above upper limit, the low air permeability and high temperature oil resistance of the grease-resistant paper are more excellent.
  • the thickness of the oil-resistant composition adhered to the fiber surface of the paper substrate is thought to be about 5 ⁇ m or less, but is not particularly limited.
  • the thickness of the oil-resistant composition adhered to the fiber surface can be confirmed by microscopic observation of the fiber cross section.
  • the content of additive A in the grease-resistant paper i.e., the total content of the crosslinker, fatty acid, fatty acid salt and modified fatty acid, is 0.8% by mass or less, preferably 0.7% by mass or less, and more preferably 0.6% by mass or less, based on the mass of the grease-resistant paper.
  • the lower limit of the content of additive A is not particularly limited, and may be 0% by mass relative to the mass of the grease-resistant paper.
  • the content of additive A is preferably 0.1% by mass or more, more preferably 0.3% by mass or more, relative to the mass of the grease-resistant paper.
  • the upper limit and the lower limit can be appropriately combined, and may be, for example, 0.1 to 0.8 mass %, 0.3 to 0.7 mass %, or 0.3 to 0.6 mass %.
  • the content of the crosslinking agent in the additive A is preferably 0.70% by mass or less, more preferably 0.6% by mass or less, and even more preferably 0.5% by mass or less, based on the mass of the grease-resistant paper.
  • the lower limit of the content of the crosslinking agent is not particularly limited, and may be 0% by mass relative to the mass of the grease-resistant paper.
  • the content of the crosslinking agent is preferably 0.01% by mass or more, more preferably 0.1% by mass or more, relative to the mass of the grease-resistant paper.
  • the upper limit and the lower limit can be appropriately combined, and may be, for example, 0.01 to 0.70 mass %, 0.1 to 0.6 mass %, or 0.1 to 0.5 mass %.
  • the total content of the fatty acid, fatty acid salt and modified fatty acid in additive A is preferably 0.30% by mass or less, more preferably 0.25% by mass or less, even more preferably 0.20% by mass or less, and particularly preferably 0.09% by mass or less, based on the mass of the grease-resistant paper.
  • the total content of the fatty acid, fatty acid salt and modified fatty acid is equal to or less than the upper limit, the high-temperature grease resistance is excellent.
  • the surface of the grease-resistant paper is not slippery, and the grease-resistant paper or packaging body using the grease-resistant paper is not easily collapsed when multiple pieces of the grease-resistant paper or packaging body using the grease-resistant paper are stacked.
  • the lower limit of the total content of the fatty acid, fatty acid salt and modified fatty acid is not particularly limited, and may be 0% by mass relative to the mass of the grease-resistant paper.
  • the total content of the fatty acid, fatty acid salt and modified fatty acid is preferably 0.01% by mass or more, more preferably 0.05% by mass or more, relative to the mass of the grease-resistant paper.
  • the upper limit and the lower limit can be appropriately combined, and may be, for example, 0 to 0.30 mass%, 0.01 to 0.25 mass%, 0.05 to 0.20 mass%, or 0.05 to 0.09 mass%.
  • the ratio of additive A derived from the oil-resistant composition to 100 parts by mass of the paper substrate is preferably 0.01 to 5 parts by mass, more preferably 0.1 to 1 part by mass, and even more preferably 0.1 to 0.8 parts by mass.
  • the ratio of additive A derived from the oil-resistant composition is equal to or less than the above upper limit, the oil resistance tends to be excellent.
  • the air permeability of the grease-resistant paper is 30,000 seconds or less, preferably 20,000 seconds or less, more preferably 10,000 seconds or less, and even more preferably 5,000 seconds or less.
  • the air permeability of the paper substrate is lower than that of the grease-resistant paper.
  • the air permeability of the grease-resistant paper is below the upper limit, so that the air permeability of the paper substrate is low, so that the coating liquid containing the oil-resistant agent composition is likely to penetrate into the paper substrate. Therefore, a coating layer that significantly impairs the air permeability is unlikely to be formed on the surface of the paper substrate, and oil resistance can be imparted while ensuring low air permeability.
  • the air permeability of the grease-resistant paper is preferably 200 seconds or more, more preferably 500 seconds or more.
  • the upper limit and the lower limit can be appropriately combined.
  • the air permeability is measured in accordance with J. TAPPI Paper and Pulp Test Method No. 5-2:2000 (Paper and Paperboard-Smoothness and Air Permeability Test Method-Part 2: Oken Method).
  • the air permeability of the grease-resistant paper can be adjusted by the air permeability of the paper base material, the amount of the oil-resistant composition attached, the type of hydrophobized starch, etc. For example, the air permeability of the grease-resistant paper tends to be lower when the amount of the oil-resistant composition attached is smaller.
  • the basis weight of the grease-resistant paper is preferably 20 to 400 g/ m2 , more preferably 25 to 100 g/ m2 , and even more preferably 30 to 70 g/ m2 .
  • the basis weight of the grease-resistant paper is equal to or greater than the lower limit, the tear strength of the grease-resistant paper is high, and the paper is less likely to break during processing, improving its suitability for processing.
  • the basis weight of the grease-resistant paper is equal to or less than the upper limit, the paper base material is easily impregnated with the grease-resistant composition. In addition, the paper is easily folded and other processing is easily performed, improving its suitability for processing.
  • the basis weight of the greaseproof paper is measured in accordance with JIS P 8124:2011.
  • the Canadian Standard Freeness (hereinafter also referred to as "disintegrated freeness") of the pulp obtained by disintegrating the grease-resistant paper is preferably 150 to 500 mL, more preferably 200 to 400 mL, and even more preferably 250 to 350 mL.
  • disintegrated freeness is within the above range, the tear strength of the grease-resistant paper is high and the processing suitability is excellent.
  • disintegrated freeness is equal to or higher than the above lower limit, the coating liquid containing the oil-resistant agent composition easily penetrates into the paper substrate, and the high-temperature oil resistance tends to be better.
  • the defibration of the greaseproof paper is carried out in accordance with JIS P 8220-1:2012. Canadian standard freeness is measured in accordance with JIS P 8121-2:2012.
  • the disintegrated freeness can be adjusted by the degree of beating of the pulp.
  • the tear strength of the greaseproof paper is preferably 150 mN or more, more preferably 180 mN or more, and even more preferably 200 mN or more. The higher the tear strength, the better.
  • the upper limit is not particularly limited, but is, for example, 3000 mN. If the tear strength is equal to or greater than the lower limit, the greaseproof paper has excellent processing suitability.
  • the tear strength is measured in accordance with JIS P 8116:2000.
  • the tear strength of greaseproof paper can be adjusted by the tear strength of the paper base material, the components of the coating liquid, etc.
  • Greaseproof paper in which a paper base material is coated with a coating liquid containing hydrophobic starch tends to have a lower tear strength than the paper base material before coating.
  • Additive A is at least one selected from the group consisting of a crosslinking agent, a fatty acid, a fatty acid salt, and a modified fatty acid. Additive A contributes to improving oil resistance by being combined with hydrophobized starch.
  • fatty acids, fatty acid salts, and modified fatty acids are also collectively referred to as "fatty acids.”
  • the crosslinking agent crosslinks hydrophobized starch particles together or between the hydrophobized starch and the cellulose in the paper base material, thereby contributing to improving oil resistance and suppressing the elution of the hydrophobized starch into water.
  • the crosslinking agent is not particularly limited as long as it can crosslink the hydrophobized starch.
  • Examples of the crosslinking agent include polyamide epichlorohydrin resin, epichlorohydrin crosslinking agents such as epichlorohydrin, glyoxal, dialdehyde, polyacrolein, N-methylol urea, N-methylol melamine, activated vinyl compounds, various esters, diisocyanates, etc.
  • epichlorohydrin crosslinking agents are preferred from the viewpoints of economy and superior effect on food.
  • fatty acids examples include saturated fatty acids, unsaturated fatty acids, distilled fatty acids, and hardened fatty acids.
  • the fatty acids may be vegetable or animal fatty acids.
  • the number of carbon atoms of the fatty acids is, for example, 8 to 30.
  • the fatty acid salt include sodium salts and potassium salts.
  • modified fatty acid various fatty acids modified to provide functionality can be used, for example, fatty acids modified with epichlorohydrin-based agents (epichlorohydrin-based agent modified fatty acids), fatty acid amides, and fatty acid esters can be mentioned.
  • epichlorohydrin-based agent for example, epichlorohydrin can be mentioned.
  • modified with epichlorohydrin-based agents does not only mean that a structure derived from epichlorohydrin-based agents is simply introduced into fatty acids, but also includes cases where epichlorohydrin-based agents are added to fatty acids in some form, such as using epichlorohydrin-based agents as dispersants for fatty acids.
  • the fatty acid may be a fatty acid sizing agent.
  • the fatty acid sizing agent may be a fatty acid, a fatty acid salt, or a modified fatty acid to which a cationic fixing agent such as a polyamine-based agent has been added, or may be epoxidized with an epichlorohydrin-based agent. Any of these may be preferably used as the fatty acid.
  • epichlorohydrin-based chemical-modified fatty acids are preferred because they have superior oil resistance. Additive A may be used alone or in combination of two or more kinds.
  • the paper base material is mainly composed of pulp.
  • “mainly composed of pulp” means that the pulp content of the paper base material is 70% by mass or more.
  • the paper base material may be any commonly used paper, such as a paper base material whose main component is wood pulp.
  • Specific examples of the paper substrate include bleached kraft paper, unbleached kraft paper, wood-free paper, paperboard, liner paper, coated paper, one-sided glossy paper, glassine paper, and graphene paper. Among these, bleached kraft paper, unbleached kraft paper, coated paper, and one-sided glossy paper are preferred in terms of the heat sealability of the heat seal paper.
  • pulp examples include chemical pulps such as bleached hardwood kraft pulp (LBKP), bleached softwood kraft pulp (NBKP), bleached hardwood sulfite pulp (LBSP), and bleached softwood sulfite pulp (NBSP).
  • Other examples include unbleached pulp, semi-bleached pulp, and bleached pulp such as stone ground pulp (GP), pressurized stone ground pulp (PGW), refiner ground pulp (RGP), chemi-ground pulp (CGP), thermomechanical pulp (TMP), and chemi-thermomechanical pulp (CTMP).
  • GP stone ground pulp
  • PGW pressurized stone ground pulp
  • RGP refiner ground pulp
  • CGP chemi-ground pulp
  • TMP thermomechanical pulp
  • CTMP chemi-thermomechanical pulp
  • Other examples include sulfite pulp and recycled paper pulp.
  • the pulp preferably contains hardwood pulp such as bleached hardwood kraft pulp (LBKP) or bleached hardwood sulfite pulp (LBSP).
  • the content of hardwood pulp is preferably 50% by mass or more, more preferably 70% by mass or more, and may be 100% by mass, based on the total mass of the pulp.
  • the pulp contains softwood pulp such as softwood bleached kraft pulp (NBKP) or softwood bleached sulfite pulp (NBSP).
  • softwood pulp is preferably 10% by mass or more, more preferably 50% by mass or more, and may be 100% by mass, based on the total mass of the pulp.
  • Hardwood pulp and softwood pulp may be used in combination.
  • the hardwood pulp content is preferably 0 to 90 mass% and the softwood pulp content is preferably 10 to 100 mass% relative to the total mass of pulp, and more preferably the hardwood pulp content is 0 to 70 mass% and the softwood pulp content is 30 to 100 mass%.
  • the paper base material may contain additive A as an internal additive.
  • additive A in the paper base material is a crosslinking agent. Since the crosslinking agent functions as a wet strength enhancing agent, the wet strength of the paper base material can be increased by including the crosslinking agent in the paper base material. If the wet strength of the paper base material is low, the paper base material may be torn when the paper base material is impregnated with the oil-proofing composition.
  • the crosslinking agent in the paper base material an epichlorohydrin-based crosslinking agent is preferred, and a polyamide epichlorohydrin resin is more preferred.
  • the content of the crosslinking agent in the paper base material can be set appropriately as long as the content of Additive A in the grease-resistant paper does not exceed the above-mentioned upper limit value.
  • the content is preferably 0.1 to 0.7 parts by mass, and more preferably 0.2 to 0.6 parts by mass, per 100 parts by mass of pulp.
  • the crosslinking agent in the paper base material contains an epichlorohydrin-based crosslinking agent
  • the content of the epichlorohydrin-based crosslinking agent is preferably 50% by mass or more, more preferably 70% by mass or more, and may be 100% by mass, relative to the total mass of the crosslinking agent in the paper base material.
  • the paper substrate does not contain fatty acids.
  • the paper base material may further contain internal additives other than Additive A.
  • internal additives other than additive A include sizing agents, fillers, paper strength agents, retention aids, pH adjusters, drainage improvers, water resistance agents, softeners, antistatic agents, defoamers, slime control agents, dyes, and pigments.
  • the air permeability of the paper base material is set so that the air permeability of the greaseproof paper is 30,000 seconds or less. Since the air permeability increases when the oil-resistant composition is applied to the paper substrate, from the viewpoint of making the air permeability of the grease-resistant paper equal to or less than the upper limit value, the air permeability of the paper substrate is preferably equal to or less than 10,000 seconds, more preferably equal to or less than 5,000 seconds, more preferably equal to or less than 1,000 seconds, even more preferably equal to or less than 500 seconds, and is preferably equal to or more than 1 second, and more preferably equal to or more than 10 seconds.
  • the upper limit value and the lower limit value can be appropriately combined.
  • the air permeability of the paper base material can be adjusted by the freeness of the pulp forming the paper base material, the type and amount of internal additives, the basis weight, density, etc. of the paper base material. For example, the higher the freeness of the pulp, the lower the air permeability tends to be. When the paper base material does not contain a sizing agent, the air permeability tends to be lower than when it contains a sizing agent.
  • the paper substrate is preferably a so-called unsized paper that does not contain a sizing agent. If the paper substrate contains a sizing agent, the coating liquid does not easily penetrate when applied, so that a coating layer is formed on the surface of the paper and the air permeability is likely to be high. On the other hand, the coating liquid easily penetrates unsized paper when applied, so that the air permeability is not likely to be high.
  • the sizing agent for paper is at least one of a rosin-based sizing agent, an alkyl ketene dimer-based sizing agent, and an alkenyl succinic anhydride-based sizing agent. Therefore, the unsized paper may be paper that does not contain a rosin-based sizing agent, an alkyl ketene dimer-based sizing agent, or an alkenyl succinic anhydride-based sizing agent.
  • the basis weight of the paper substrate is set taking into consideration the basis weight of the greaseproof paper and the applied amount of the greaseproofing composition.
  • the basis weight of the paper base material is preferably 399 g/m2 or less , more preferably 99 g/m2 or less , and even more preferably 69 g/m2 or less , from the viewpoint of making the basis weight of the greaseproof paper equal to or less than the above upper limit. Also, from the viewpoint of increasing the tear strength of the greaseproof paper, it is preferably 18 g/ m2 or more, more preferably 20 g/m2 or more , even more preferably 25 g/m2 or more , and particularly preferably 30 g/m2 or more .
  • the above upper limit and the above lower limit can be appropriately combined.
  • the oil-proofing composition comprises a hydrophobized starch.
  • Hydrophobized starch is starch that has been subjected to a hydrophobization treatment (hydrophobic modification).
  • hydrophobization treatments include, but are not limited to, a treatment of contacting starch with an aqueous organosilane solution in the presence of an alkali aluminate or an alkali hydroxide, a treatment of derivatizing starch with silicone or alkenyl, a treatment of reacting starch with an organic acid anhydride such as octenylsuccinic anhydride or dodecenylsuccinic anhydride, a treatment of copolymerizing starch with a hydrophobic monomer such as acrylonitrile or a hydrophobic unsaturated monomer, a treatment of imparting a hydrophobic group containing a hydrocarbon group to starch by etherification or esterification, a treatment of converting starch into an alkyl
  • starches that can be hydrophobically treated include, but are not limited to, tapioca starch, potato starch, corn starch, wheat starch, and rice starch.
  • the hydrophobized starch may be used alone or in combination of two or more kinds.
  • the oil-resistant composition may contain additive A.
  • additive A contained in the paper substrate may be a crosslinking agent, may be a fatty acid, or may be both.
  • the crosslinking agent is preferably an epichlorohydrin-based crosslinking agent, and more preferably a polyamide-epichlorohydrin resin.
  • the content of the epichlorohydrin-based crosslinking agent is preferably 50 mass % or more, more preferably 70 mass % or more, and may be 100 mass %, based on the total mass of the crosslinking agents in the oil-resistant agent composition.
  • the oil-resistant composition contains additive A and additive A contains fatty acids
  • the fatty acids are preferably epichlorohydrin-based chemically modified fatty acids.
  • the content of the epichlorohydrin-based agent-modified fatty acid is preferably 50 mass% or more, more preferably 70 mass% or more, and may be 100 mass% based on the total mass of the fatty acids in the oil-resistant agent composition.
  • the total mass of fatty acids is the combined mass of fatty acids, fatty acid salts and modified fatty acids.
  • the oil-resistant composition contains hydrophobized starch and additive A, and additive A in the oil-resistant composition is a crosslinking agent.
  • additive A in the oil-resistant composition is a crosslinking agent
  • the high-temperature oil resistance tends to be better.
  • the inclusion of a crosslinking agent in the oil-resistant composition makes it easier for the hydrophobized starch to be crosslinked by the crosslinking agent, and thus the elution of the hydrophobized starch is suppressed.
  • Two or more types of crosslinking agents may be used in combination.
  • the oil-resistant composition contains hydrophobized starch and additive A, and additive A in the oil-resistant composition is a fatty acid. When additive A in the oil-resistant composition is a fatty acid, the long-term oil resistance tends to be more excellent. Two or more fatty acids may be used in combination.
  • the oil-proofing composition may further contain other components in addition to the hydrophobized starch and additive A, if necessary.
  • other components include antifoaming agents, thickeners, water retention agents, pigments, etc.
  • the ratio of additive A to 100 parts by mass of hydrophobized starch is preferably 0.5 to 10 parts by mass, more preferably 0.5 to 5 parts by mass, and even more preferably 1 to 3 parts by mass.
  • the ratio of additive A is equal to or greater than the lower limit, the effect of additive A is fully exerted, and when the ratio is equal to or less than the upper limit, high-temperature oil resistance is excellent.
  • the combined proportion of the hydrophobized starch and additive A to the total mass of the oil-resistant composition is preferably 50% by mass or more, more preferably 70% by mass or more, even more preferably 90% by mass or more, and may be 100% by mass.
  • the grease-resistant paper according to this embodiment can be produced, for example, by applying a coating liquid containing the grease-resistant composition and water to a paper substrate, and then drying the coating liquid.
  • the paper base and the oil-proofing composition are as described above.
  • the paper base material can be produced, for example, by making paper using various papermaking machines, forming a wet paper, and drying it.
  • various papermaking machines There are no particular limitations on the papermaking machine. Examples include a Fourdrinier papermaking machine, a gap former type papermaking machine, a cylinder papermaking machine, and a short wire papermaking machine. From the standpoint of economy, a papermaking machine equipped with an on-machine coater is preferred.
  • the pulp beating method is not particularly limited.
  • the preferred range of disintegration freeness which is an index of the degree of beating of the pulp, is as described above.
  • the beaten pulp may be mixed with an internal additive such as additive A as necessary and dispersed in water to prepare a pulp slurry of a concentration suitable for papermaking.
  • additive A an index of the degree of beating of the pulp
  • the wet paper obtained by the papermaking machine is preferably dried using a multi-stage cylinder dryer, an air dryer, or a Yankee dryer.
  • the coating liquid can be prepared by mixing the materials constituting the oil-proofing agent composition with water.
  • the coating method of the coating liquid is not particularly limited, and various commonly available coating machines can be used. Examples of coating machines include blade coaters, air knife coaters, roll coaters, reverse roll coaters, bar coaters, curtain coaters, slot die coaters, gravure coaters, champlex coaters, brush coaters, slide bead coaters, two-roll size press coaters, pound size press coaters, rod metering size press coaters, blade metering size press coaters, short dwell coaters, gate roll coaters, and nip coaters using a calendar. Among them, in terms of productivity, on-machine coating machines are preferred.
  • on-machine coating machines examples include blade coaters, bar coaters, gate roll coaters, rod metering size press coaters, blade metering size press coaters, and pound size press coaters.
  • the coating liquid may be applied to one or both sides of the paper substrate, although from the viewpoint of oil resistance, it is preferable to apply the coating liquid to both sides.
  • the amount of the coating solution to be applied is determined taking into consideration the amount of the oil-proofing agent composition to be applied.
  • the amount of the coating solution applied is preferably 1 to 20 g/ m2 , more preferably 1 to 10 g/ m2 , and even more preferably 2 to 6 g/ m2 , calculated as the mass of hydrophobized starch per m2 of the paper base material.
  • the coating amount of the coating fluid is preferably 0.01 to 5 parts by mass, more preferably 0.1 to 1 part by mass, and even more preferably 0.1 to 0.8 parts by mass, calculated as the ratio of Additive A in the oil-proofing composition to 100 parts by mass of the paper substrate.
  • the grease-resistant paper may be subjected to a smoothing treatment if necessary.
  • the smoothing treatment may be carried out on-machine or off-machine using a normal smoothing treatment device such as a super calendar, gloss calendar, or soft calendar.
  • a normal smoothing treatment device such as a super calendar, gloss calendar, or soft calendar.
  • the paper base material may be subjected to a smoothing treatment before the coating liquid is applied.
  • the resulting greaseproof paper is wound into a roll. Thereafter, in order to adjust the width of the greaseproof paper to the width of the processing machine in the subsequent process, portions at both ends of the roll may be removed using a slitter.
  • the uses of the greaseproof paper are not particularly limited, but examples include packaging materials and lining paper. In particular, it is suitable as a packaging material.
  • a packaging material comprises the greaseproof paper of the present invention.
  • the greaseproof paper may be used as a packaging material as it is, or may be processed into a packaging material.
  • a known processing method can be applied as the processing.
  • packaging materials made by processing the greaseproof paper include bags such as gusset bags, single-open bags, flat bags, and square-bottom bags, as well as various other containers.
  • Examples of items that can be packaged with the packaging material include foods such as fried foods, confectioneries, and bread, and desiccant materials. Among these, food is preferred, and oil-containing foods such as fried foods and bread are more preferred, with oil-containing foods that are packaged at high temperatures (e.g., 90 to 180°C) and oil-containing foods that are heated to high temperatures after packaging being particularly preferred.
  • foods such as fried foods, confectioneries, and bread, and desiccant materials.
  • food is preferred, and oil-containing foods such as fried foods and bread are more preferred, with oil-containing foods that are packaged at high temperatures (e.g., 90 to 180°C) and oil-containing foods that are heated to high temperatures after packaging being particularly preferred.
  • a package according to one embodiment of the present invention is an article packaged with the packaging material according to the present invention.
  • Examples of the article include the same as those described above.
  • As the packaging method a known packaging method can be applied.
  • Parts and “%” indicate “parts by mass” and “% by mass”, respectively.
  • Example 1 Pulp consisting of 60% by mass of LBKP and 40% by mass of NBKP was mixed with 0.4% of a paper strength agent (trade name: Polystron OFT-5, manufactured by Arakawa Chemical Industries, Ltd.) as an internal additive based on the bone dry mass of the pulp, 0.4% of a wet strength agent (epichlorohydrin-based crosslinking agent (polyamide epichlorohydrin resin), trade name: WS4024, manufactured by Seiko PMC Co., Ltd.) as a crosslinking agent based on the bone dry mass of the pulp, and 1% of aluminum sulfate based on the bone dry mass of the pulp, and the mixture was made into a paper base material having a basis weight of 40 g/ m2 using a papermaking machine. The degree of beating of the pulp was adjusted so that the resulting grease-resistant paper had a disintegration freeness of 220 mL. The basis weight was measured in accordance with JIS P 8124:2011
  • a coating liquid (solids concentration 15%) was prepared by dispersing hydrophobic starch (product name: Filmkote 370, manufactured by Ingredion) and a crosslinking agent (epichlorohydrin-based crosslinking agent (polyamide-epichlorohydrin resin), product name: WS4024, manufactured by Seiko PMC Corporation) in water at a solids ratio of 99:1.
  • hydrophobic starch product name: Filmkote 370, manufactured by Ingredion
  • a crosslinking agent epichlorohydrin-based crosslinking agent (polyamide-epichlorohydrin resin), product name: WS4024, manufactured by Seiko PMC Corporation
  • the coating liquid was applied to both sides of the paper base material so that the coating amount after drying (total of both sides) was 4.6 g/ m2 , and then dried to obtain greaseproof paper.
  • the amount of the coating solution applied after drying corresponds to the amount of the oil-proofing agent composition adhered in terms of solid content.
  • Example 2 Grease-resistant paper was obtained in the same manner as in Example 1, except that the preparation of the paper base material was changed as follows.
  • a paper base material was obtained by blending pulp consisting of 70% by mass of LBKP and 30% by mass of NBKP with 0.4% of a paper strength agent (trade name: Polystron TS-1, manufactured by Arakawa Chemical Industries, Ltd.) as an internal additive, 0.4% of a wet strength agent (trade name: WS4024, manufactured by Seiko PMC Co., Ltd.) as a crosslinking agent, and 1% of aluminum sulfate as a crosslinking agent, with a basis weight of 40 g/ m2 on a papermaking machine. The degree of beating of the pulp was adjusted so that the resulting grease-resistant paper had a disintegration freeness of 320 mL.
  • Example 3 Grease-resistant paper was obtained in the same manner as in Example 2, except that the preparation of the coating liquid was changed as follows.
  • a coating liquid (solids concentration 15%) was prepared by dispersing hydrophobic starch (product name: Fikmkote 370, manufactured by Ingredion) and fatty acids (fatty acids modified with epichlorohydrin-based agents, product name: PT8124, manufactured by Seiko PMC Corporation) in water at a solids ratio of 99:1.
  • Example 4 Grease-resistant paper was obtained in the same manner as in Example 3, except that the production of the paper base material was changed as follows, and the coating liquid was applied so that the coating amount after drying (total of both sides) was 5.0 g/ m2 .
  • Pulp consisting of 70% by mass of LBKP and 30% by mass of NBKP was mixed with 0.4% of a paper strength agent (trade name: Polystron TS-1, manufactured by Arakawa Chemical Industries, Ltd.) as an internal additive based on the bone dry mass of the pulp, 0.5% of a wet strength agent (trade name: WS4024, manufactured by Seiko PMC Corporation) as a crosslinking agent based on the bone dry mass of the pulp, and 1% of aluminum sulfate based on the bone dry mass of the pulp, and the mixture was made into a paper base material having a basis weight of 40 g/ m2 using a papermaking machine. The degree of beating of the pulp was adjusted so that the resulting grease-resistant paper
  • Example 5 Grease-resistant paper was obtained in the same manner as in Example 4, except that the preparation of the coating liquid was changed as follows.
  • a coating liquid (solids concentration 15%) was prepared by dispersing only hydrophobized starch (product name: Fikmkote 370, manufactured by Ingredion) in water.
  • Example 6 Grease-resistant paper was obtained in the same manner as in Example 5, except that the preparation of the paper base material was changed as follows.
  • a paper base material was obtained by blending a paper strength agent (product name: Polystron TS-1, manufactured by Arakawa Chemical Industries, Ltd.) as an internal additive at 0.4% based on the bone dry mass of the pulp and aluminum sulfate at 1% based on the bone dry mass of the pulp with a papermaking machine to give a basis weight of 40 g/ m2 .
  • the degree of beating of the pulp was adjusted so that the resulting grease-resistant paper had a disintegration freeness of 320 mL.
  • Example 2 Grease-resistant paper was obtained in the same manner as in Example 1, except that the preparation of the coating liquid was changed as follows.
  • a coating liquid solids concentration 15%
  • a coating liquid was prepared by dispersing hydrophobized starch (product name: Filmkote 370, manufactured by Ingredion), a crosslinking agent (product name: WS4024, manufactured by Seiko PMC Corporation), and a fatty acid (product name: PT8124, manufactured by Seiko PMC Corporation) in water at a solids ratio of 86.4:8.6:5.
  • the greaseproof paper was disintegrated in accordance with JIS P 8220-1, and the freeness (Canadian standard freeness) of the obtained pulp was measured in accordance with JIS P 8121-2:2012, and the value was taken as the disintegrated freeness.
  • the greaseproof papers of Examples 1 to 6 had low air permeability of 30,000 seconds or less. They also had excellent high-temperature oil resistance, good oil resistance at room temperature (kit) and good long-term oil resistance.
  • the greaseproof paper of Comparative Example 1 which used the same coating solution as in Examples 1 and 2 but changed the paper substrate to one with a size, had high air permeability.
  • the oil resistance (kit), high temperature oil resistance, and long-term oil resistance were also poor.
  • the paper base material was the same as in Example 1, but the oil-resistant paper of Comparative Example 2, in which the content of Additive A in the coating liquid was increased to more than 0.8 mass %, had poor high-temperature oil resistance.
  • the present invention provides greaseproof paper and packaging material with low air permeability and excellent high-temperature oil resistance, as well as packaging using this packaging material.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Paper (AREA)

Abstract

Un papier résistant à l'huile selon un mode de réalisation de la présente invention comporte un matériau de base en papier pour lequel la pâte est un composant principal, et une composition d'agent résistant à l'huile fixée au matériau de base en papier et contenant de l'amidon rendu hydrophobe, au moins une partie de la composition d'agent résistant à l'huile étant imprégnée dans le matériau de base en papier. La teneur totale en agent de réticulation, en acide gras, en sel d'acide gras et en acide gras modifié ne dépasse pas 0,8 % en masse par rapport à la masse du papier résistant à l'huile, et la perméabilité à l'air ne dépasse pas 30 000 secondes.
PCT/JP2024/008795 2023-03-15 2024-03-07 Papier résistant à l'huile, matériau d'emballage et emballage Pending WO2024190610A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2025506773A JPWO2024190610A1 (fr) 2023-03-15 2024-03-07

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2023040776 2023-03-15
JP2023-040776 2023-03-15

Publications (1)

Publication Number Publication Date
WO2024190610A1 true WO2024190610A1 (fr) 2024-09-19

Family

ID=92755711

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2024/008795 Pending WO2024190610A1 (fr) 2023-03-15 2024-03-07 Papier résistant à l'huile, matériau d'emballage et emballage

Country Status (2)

Country Link
JP (1) JPWO2024190610A1 (fr)
WO (1) WO2024190610A1 (fr)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2006117911A1 (fr) * 2005-04-27 2006-11-09 Tokushu Paper Mfg. Co., Ltd. Feuille de materiau resistant aux huiles
JP2010013792A (ja) * 2003-08-11 2010-01-21 Tokushu Paper Mfg Co Ltd 耐油性シート状物
JP2013237941A (ja) * 2012-05-14 2013-11-28 Oji Holdings Corp 耐油紙および耐油紙の製造方法
WO2021229451A1 (fr) * 2020-05-11 2021-11-18 Swm Luxembourg Article résistant à l'huile

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010013792A (ja) * 2003-08-11 2010-01-21 Tokushu Paper Mfg Co Ltd 耐油性シート状物
WO2006117911A1 (fr) * 2005-04-27 2006-11-09 Tokushu Paper Mfg. Co., Ltd. Feuille de materiau resistant aux huiles
JP2013237941A (ja) * 2012-05-14 2013-11-28 Oji Holdings Corp 耐油紙および耐油紙の製造方法
WO2021229451A1 (fr) * 2020-05-11 2021-11-18 Swm Luxembourg Article résistant à l'huile

Also Published As

Publication number Publication date
JPWO2024190610A1 (fr) 2024-09-19

Similar Documents

Publication Publication Date Title
CA2632237C (fr) Carton renfermant des particules de cellulose en microlamelles
US8790494B2 (en) Paper with improved stiffness and bulk and method for making same
FI123562B (fi) Menetelmä paperin valmistamiseksi käyttäen alkyyliketeenidimeeriä (AKD) ja akryylihappoa sisältävää materiaalia lisäineina
US7279071B2 (en) Paper articles exhibiting water resistance and method for making same
US7628885B2 (en) Uncoated paperboard for packages
US10006171B2 (en) Methods and compositions for enhancing sizing in papermaking process
JP2018053374A (ja) 耐油紙及びその製造方法
JP6003793B2 (ja) 耐油紙及び耐油紙の製造方法
WO2004027149A1 (fr) Papiers comprenant un compose contenant du bore et procede de fabrication correspondant
WO2023161351A1 (fr) Papier barrière à la graisse exempt de composés chimiques fluorés
JP6798479B2 (ja) 耐油紙
JP6459956B2 (ja) 耐油紙
WO2024190610A1 (fr) Papier résistant à l'huile, matériau d'emballage et emballage
JP5041505B2 (ja) 透明紙原紙
WO2024081557A1 (fr) Procédés pour conférer une résistance à l'huile et à la graisse à des produits en papier
JP2018178343A (ja) 熱転写紙用原紙および熱転写紙
JP6891785B2 (ja) 耐油紙
US20060254736A1 (en) Paper articles exhibiting water resistance and method for making same
JP5009698B2 (ja) 塗工紙の製造方法
JP4162137B2 (ja) 耐油性シート状物
JP2024165659A (ja) 耐油紙及びその製造方法
WO2024126892A1 (fr) Composition de taille de surface
JP2023006206A (ja) シート
AU2004236484B2 (en) A process for preparing sized paper and paperboard
Goose Creek et al. ZuraW et al.

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 24770716

Country of ref document: EP

Kind code of ref document: A1

WWE Wipo information: entry into national phase

Ref document number: 2025506773

Country of ref document: JP

WWE Wipo information: entry into national phase

Ref document number: 2501005928

Country of ref document: TH

NENP Non-entry into the national phase

Ref country code: DE