Laminate for packaging

Abstract

To provide a laminate for packaging having at least a paper substrate and a vapor-deposited layer, and suppressed in degradation of the vapor-deposited layer and deterioration of adhesion of the vapor-deposited layer to an adjacent layer in preservation in a high-temperature and high-humidity environment.SOLUTION: A laminate for packaging comprises: a paper substrate; a coating layer of one or two or more layers on at least one surface of the paper substrate; and a vapor-deposited layer only in the outside of the coating layer and on the one surface of the paper substrate on the basis of the paper substrate. The laminate for packaging is configured such that the paper substrate contains 0.1 mass% or more and 2 mass% or less of aluminum sulfate based on the paper substrate; the coating layer contains at least a water dispersible high polymer; a Bekk smoothness in a surface at a side having no vapor-deposited layer is 20 seconds or more and 700 seconds or less on the basis of the paper substrate of the laminate for packaging; and a water soluble chloride ion concentration in the laminate for packaging is 300 mg / Kg or less.SELECTED DRAWING: None

Description

[Technical Field]

[0001] The present invention relates to a packaging laminate having a vapor-deposited layer. [Background technology]

[0002] Conventionally, various packaging materials have been developed and proposed as packaging materials for constituting packaged products in which various items such as foods and beverages, pharmaceuticals, chemicals, electronic components, cosmetics, sanitary products, daily necessities, etc. One example of such packaging materials is a packaging laminate having a plastic film as a support and a vapor deposition layer.

[0003] On the other hand, metallized paper, which uses paper as a support, has attracted attention from the viewpoints of reducing plastic consumption and facilitating resource recycling. Taking advantage of its gloss and durability, metallized paper is widely used for posters, calendars, catalogs, POP displays, labels, packaging, etc.

[0004] Patent Document 1 discloses a metal working sheet that can be used as a base sheet when manufacturing a metal working sheet having a metal layer provided on the surface of a base sheet, as a metal working sheet that can be used to manufacture a metal working sheet that is resistant to deterioration of the metal layer over time and has excellent storage stability. The metal working sheet contains a fiber sheet and one or more specific anions selected from the group consisting of nitrate ions, acetate ions, sulfate ions, phosphate ions, monohydrogen phosphate ions, and dihydrogen phosphate ions, and the total concentration of the specific anions eluted when 5 g of the bone-dry weight of the metal working sheet is immersed in distilled water at a liquid temperature of 20°C for 24 hours, as measured in accordance with ion chromatography method JIS K-0127:2013, is 1600 ppm or more relative to the bone-dry weight of the metal working sheet. Patent document 2 discloses aluminum vapor-deposited paper that has been improved so that when a synthetic resin overcoat is applied to the vapor-deposited layer of aluminum vapor-deposited paper that has been stored in a rolled state during the manufacturing process, the synthetic resin and the vapor-deposited layer exhibit good adhesion to each other.The aluminum vapor-deposited paper has an electron beam cured resin layer and an aluminum vapor-deposited layer formed sequentially on at least one surface of a paper base, and is characterized in that the Oken smoothness of the surface of the aluminum vapor-deposited layer after aluminum vapor deposition is 10,000 seconds or more, and the Oken smoothness of the surface opposite the aluminum vapor-deposited layer of the paper base is 50 to 1,000 seconds. Patent Document 3 discloses an aluminum vapor-deposited paper that has been improved so that when a synthetic resin overcoat is applied to the vapor-deposited layer of aluminum vapor-deposited paper that has been stored in a rolled state during the manufacturing process, the synthetic resin and the vapor-deposited layer exhibit good adhesion.The metal vapor-deposited paper is formed by forming an undercoat layer mainly composed of a synthetic resin directly on the base paper or after forming an aqueous coating composition on the base paper, and then forming a metal vapor-deposited layer on top of it, and is characterized in that the amount of chlorine in organic chlorine compounds in the base paper is 400 ppm or less. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Patent Publication No. 2021-070890 [Patent Document 2] Japanese Patent Application Publication No. 09-059894 [Patent Document 2] Japanese Patent Application Publication No. 05-195487 Summary of the Invention [Problem to be solved by the invention]

[0006] The present inventors have found that conventional metallized paper has problems in that the metallized layer deteriorates and the adhesion of the metallized layer to adjacent layers decreases when stored in a high-temperature, high-humidity environment. Deterioration of the metallized layer and / or a decrease in the adhesion of the metallized layer in metallized paper can lead to a decrease in the gas barrier property and water vapor barrier property of the metallized paper, which is problematic when the metallized paper is used as a packaging material.

[0007] An object of the present invention is to provide a packaging laminate having at least a paper support and a vapor-deposited layer, which is capable of suppressing deterioration of the vapor-deposited layer and a decrease in adhesion of the vapor-deposited layer to adjacent layers when stored in a high-temperature, high-humidity environment. [Means for solving the problem]

[0008] Specific means for solving the above problems are as follows. Embodiments of the present invention include packaging laminates having the following aspects. [1] A packaging laminate having a paper substrate, one or more coating layers on at least one side of the paper substrate, and a vapor deposition layer on the outer side of the coating layer relative to the paper substrate and only on one side of the paper substrate, the paper support contains aluminum sulfate in an amount of 0.1% by mass or more and 2% by mass or less based on the paper support, the coating layer contains at least a water-dispersible polymer, the Beck smoothness of the packaging laminate on the side not having the vapor deposition layer, based on the paper support, is 20 seconds or more and 700 seconds or less; The water-soluble chloride ion concentration in the packaging laminate is 300 mg / Kg or less. Packaging laminate. [2] The coating amount of the coating layer is 2 g / m 2 More than 45g / m 2 The packaging laminate according to [1] above, which is: [3] The coating layer comprises one coating layer adjacent to the paper support, the one coating layer mainly contains a water-dispersible polymer and a pigment; The packaging laminate according to [1] or [2] above. [4] The coating layer comprises a first coating layer adjacent to the paper support and a second coating layer located outside the first coating layer relative to the paper support; the first coating layer mainly contains a water-dispersible polymer and a pigment, The second coating layer mainly contains a water-dispersible polymer. The packaging laminate according to [1] or [2] above. [Effects of the Invention]

[0009] According to an embodiment of the present invention, there is provided a packaging laminate having at least a paper support and a vapor-deposited layer, which is capable of suppressing deterioration of the vapor-deposited layer and a decrease in adhesion of the vapor-deposited layer to adjacent layers during storage in a high-temperature, high-humidity environment. The packaging laminate of this embodiment also reduces the amount of plastic used and facilitates resource recycling compared to packaging laminates using a plastic film as a support. DETAILED DESCRIPTION OF THE INVENTION

[0010] In this specification, the suppression of deterioration of the vapor-deposited layer and reduction in adhesion of the vapor-deposited layer to adjacent layers during storage of the packaging laminate in a high-temperature, high-humidity environment is also referred to as "the packaging laminate having good storage stability."

[0011] [Packaging laminate] One embodiment of the present invention provides a packaging laminate comprising a paper substrate, one or more coating layers on at least one side of the paper substrate, and a vapor-deposited layer on the outer side of the coating layer and on only one side of the paper substrate. In this embodiment, the paper substrate contains aluminum sulfate at a ratio of 0.1% to 2% by mass, based on the paper substrate. The coating layer contains at least a water-dispersible polymer. The Beck smoothness of the packaging laminate on the side of the paper substrate that does not have the vapor-deposited layer is 20 seconds to 700 seconds, and the water-soluble chloride ion concentration of the packaging laminate is 300 mg / kg or less. This embodiment provides a packaging laminate comprising at least a paper substrate and a vapor-deposited layer, which is inhibited from deteriorating and from losing adhesion of the vapor-deposited layer to adjacent layers when stored in a high-temperature, high-humidity environment.

[0012] ·Paper support The paper substrate is base paper made by a conventionally known papermaking method under acidic, neutral or alkaline conditions from a paper stock prepared by dispersing wood pulp and / or non-wood pulp in a medium such as water to which various additives such as fillers, sizing agents, binders, fixing agents, retention agents and paper strength agents are added as needed; plain paper obtained by treating the base paper with a size press liquid; plain paper obtained by treating the surface of the base paper with a surface treatment liquid; or high-quality paper obtained by calendering the base paper or plain paper. Furthermore, one or more additives selected from pigment dispersants, bulking agents, thickeners, flow improvers, pitch control agents, defoamers, foam inhibitors, release agents, foaming agents, penetrating agents, humectants, preservatives, mildew inhibitors, water-resistant agents, wet strength agents, and dry strength agents may be added to the paper stock as appropriate within a range that does not impair the desired effects of the present invention.

[0013] Wood pulp is well known in the papermaking field, and examples of wood pulp include chemical pulps such as leaf bleached kraft pulp (LBKP), leaf unbleached kraft pulp (LUKP), needle bleached kraft pulp (NBKP), and needle unbleached kraft pulp (NUKP), mechanical pulps such as groundwood pulp (GP), pressure groundwood pulp (PGW), refiner mechanical pulp (RMP), thermomechanical pulp (TMP), chemithermomechanical pulp (CTMP), chemimechanical pulp (CMP), and chemigroundwood pulp (CGP), and recycled paper pulp such as deinked pulp (DIP). Non-wood pulp is pulp made from non-wood fibers conventionally known in the papermaking field. Examples of raw materials for non-wood fibers include woody bast such as paper mulberry, Mitsumata, and gampi, herbaceous bast such as flax, hemp, and kenaf, leaf fibers such as Manila hemp, abaca, and sisal, grasses such as rice straw, wheat straw, sugarcane bacillus, bamboo, and esparto, and seed hairs such as cotton and linter. The wood pulp and / or non-wood pulp is one or more selected from the group consisting of the above-mentioned wood pulps and non-wood pulps.

[0014] The filler is a pigment conventionally known in the papermaking field. Examples of the pigment include inorganic pigments such as light calcium carbonate, heavy calcium carbonate, various kaolins, talc, barium sulfate, titanium dioxide, zinc oxide, zinc sulfide, zinc carbonate, satin white, silica, aluminum silicate (e.g., bentonite), potassium aluminum silicate (e.g., mica), diatomaceous earth, activated clay, alumina, alumina hydrate, aluminum hydroxide, lithopone, zeolite, magnesium carbonate, and magnesium hydroxide. Further examples include organic pigments such as styrene-based plastic pigments, acrylic-based plastic pigments, polyethylene-based plastic pigments, urea resins, melamine resins, and microcapsules. The filler is one or more selected from the group consisting of the inorganic pigments and organic pigments described above.

[0015] The sizing agent is an internal sizing agent conventionally known in the papermaking field, and examples of the internal sizing agent include rosin-based sizing agents for acidic paper, and alkenyl succinic anhydride, alkyl ketene dimer, neutral rosin-based sizing agents, and cationic styrene acrylic sizing agents for neutral paper. The surface sizing agent used in the size press liquid is one that has been conventionally known in the papermaking field, and examples of the surface sizing agent include starch-based sizing agents, cellulose-based sizing agents, polyvinyl alcohol-based sizing agents, styrene-acrylic sizing agents, olefin-based sizing agents, styrene-maleic acid-based sizing agents, and acrylamide-based sizing agents. The 30-second Cobb sizing degree specified in JIS P8140:1998 "Paper and paperboard - Water absorption test method - Cobb method" for paper substrates is 1 to 100 g / m 2 This range is preferable from the viewpoint of stability when forming a coating layer, which will be described later.

[0016] Papermaking is carried out by adjusting the paper stock to an acidic, neutral or alkaline state using a conventionally known paper machine, such as a Fourdrinier paper machine, a twin-wire paper machine, a combination paper machine, a cylinder paper machine or a Yankee paper machine. Calendering is a process for equalizing the smoothness and thickness of paper by passing it between rolls, and is carried out using a conventionally known calendering device, such as a machine calender, a soft-nip calender, a super calender, a multi-stage calender, or a multi-nip calender. The size press can be performed using a size press device conventionally known in the papermaking field, such as an inclined size press, a horizontal size press, a film transfer type rod metering size press, a roll metering size press, or a blade metering size press, a rod metering size press such as a shim sizer, an Optisizer, or a speed sizer, or a roll metering size press such as a gate roll coater, a bill blade coater, a twin blade coater, a Belbapa coater, a tab size press, or a calendar size press.

[0017] In this embodiment, the paper substrate contains aluminum sulfate in a proportion of 0.1% by mass to 2% by mass, preferably 0.3% by mass to 1.5% by mass, based on the weight of the paper substrate. This allows for a packaging laminate with good shelf life. A paper substrate containing aluminum sulfate in the above proportion can be obtained, for example, by incorporating aluminum sulfate into the pulp slurry in the paper substrate manufacturing method described above, or by coating the paper substrate obtained by the above manufacturing method with an aqueous solution containing aluminum sulfate and drying it. Examples of coating devices include film press coaters, rod coaters, air knife coaters, rod blade coaters, bar coaters, blade coaters, gravure coaters, curtain coaters, E-bar coaters, and film transfer coaters. Examples of drying devices include various drying devices such as hot air dryers such as linear tunnel dryers, arch dryers, air loop dryers, and sine-curve air float dryers, infrared heating dryers, and dryers using microwaves, etc.

[0018] In some embodiments, the paper substrate is preferably kraft paper, which generally refers to paper made from pulp produced by the kraft process.

[0019] The basis weight of the paper support is not particularly limited. In some embodiments, the basis weight of the paper support is, for example, 20 g / m 2 More than 200g / m 2 The density of the paper support is not particularly limited. In some embodiments, the density of the paper support is, for example, 0.5 to 1.2 g / cm. 3 It could be.

[0020] Coating layer The packaging laminate of this embodiment has one or more coating layers on at least one side of the paper substrate. The coating layer contains at least a water-dispersible polymer. The water-dispersible polymer is a polymer that is not water-soluble and can be stably dispersed in water, and any polymer known in the field of coated paper can be used. In this specification, the term "not water-soluble" for a water-dispersible polymer means that the solubility in water at 25°C is less than 10 g / L. Examples of water-dispersible polymers include polyolefin resins such as polyethylene and polypropylene; modified polyolefin resins such as ethylene-acrylic acid copolymer, ethylene-methacrylic acid copolymer, ethylene-vinyl acetate copolymer, and ethylene-vinyl alcohol copolymer; styrene resins such as polystyrene, acrylonitrile styrene, and acrylonitrile butadiene styrene; conjugated diene resins such as styrene-butadiene copolymer and acrylonitrile butadiene copolymer; acrylic resins such as acrylic acid ester or methacrylic acid ester polymers or methyl methacrylate butadiene copolymer; styrene-acrylic resins such as styrene-acrylic copolymer or styrene-methacrylic copolymer; polyurethane resins; chlorine-based resins such as polyvinyl chloride and polyvinylidene chloride; alkyd resins; polyester resins; biodegradable resins such as polylactic acid and polybutylene succinate; modified epoxy resins; functional group-modified resins of these copolymers using functional group-containing monomers such as carboxyl groups; ionomer resins in which the above resins are crosslinked with metal ions; thermosetting synthetic resins such as melamine resin and urea resin; and natural rubber.

[0021] Commercially available water-dispersible polymers may be used. Examples of commercially available water-dispersible polymers include conjugated diene resins, acrylic resins, or styrene-acrylic resins sold by BASF; conjugated diene resins sold by Asahi Kasei Corporation; conjugated diene resins sold by Nippon A&L Co., Ltd.; conjugated diene resins sold by Nippon Zeon Co., Ltd.; modified polyolefin resins or modified polyolefin ionomer resins sold by Mitsui Chemicals, Inc.; modified polyolefin resins sold by Sumitomo Seika Chemicals Co., Ltd.; polyurethane resins sold by Mitsui Chemicals, Inc.; polyurethane resins sold by DIC Corporation; polyurethane resins sold by Dainichiseika Color & Chemicals Mfg. Co., Ltd.; polyester resins sold by Unitika Ltd.; biodegradable resins sold by Miyoshi Oil & Fats Co., Ltd.; acrylic resins sold by Seiko PMC Co., Ltd.; chlorine-based resins sold by Solvay; chlorine-based resins sold by Nissin Chemical Industry Co., Ltd., but are not limited thereto.

[0022] In one embodiment, the packaging laminate has one or more coating layers on one side of the paper support. In another embodiment, the packaging laminate has one or more coating layers on both sides of the paper support.

[0023] In some embodiments, the coating layer contains, in addition to the water-dispersible polymer, a pigment conventionally known in the field of coated paper. Examples of pigments include, but are not limited to, inorganic pigments such as various kaolins, precipitated calcium carbonate, ground calcium carbonate, talc, barium sulfate, titanium dioxide, zinc oxide, zinc sulfide, zinc carbonate, satin white, silica, aluminum silicate (e.g., bentonite), potassium aluminum silicate (e.g., mica), diatomaceous earth, activated clay, alumina, alumina hydrate, aluminum hydroxide, lithopone, zeolite, magnesium carbonate, and magnesium hydroxide. Kaolin is industrially refined and processed from naturally occurring kaolin ores such as kaolinite, nacrite, dickite, halloysite, and hydrated halloysite, and is produced by processes such as crushing, washing, iron removal, and classification. Kaolin also includes highly processable kaolin, such as delaminated kaolin, which is made into thin plates by applying shear force to improve the aspect ratio, engineered kaolin, which has been adjusted to have a sharp particle size distribution, and calcined kaolin, which has improved cohesion. Further examples of pigments include organic pigments such as styrene-based plastic pigments, acrylic-based plastic pigments, polyethylene-based plastic pigments, urea resins, melamine resins, and microcapsules. In some embodiments, the pigment in the coating layer is an inorganic pigment because this improves shelf life. The particle size of the pigment is preferably in the range of 0.05 to 30 μm, as this allows for uniformity when forming a coating layer. Pigments can have various known shapes, such as spherical, lumpy, amorphous, tabular, or acicular, and various shapes can be employed. The aspect ratio of the pigment is preferably 1 to 50. It is also possible to mix pigments with different particle size distributions or different shapes, for example, by mixing a pigment with an average particle size of 1 μm or less with a pigment with an average particle size of 1 μm or more. When the coating layer contains a pigment, the mass ratio of the water-dispersible polymer to the pigment in the coating layer is preferably water-dispersible polymer:pigment=25:75 to 80:20, and more preferably water-dispersible polymer:pigment=30:70 to 60:40. In at least one embodiment, when the coating layer contains a pigment, the pigment is an inorganic pigment, and the ratio of the water-dispersible polymer to the inorganic pigment in the coating layer, in mass ratio, is preferably water-dispersible polymer:pigment=25:75 to 80:20, and more preferably water-dispersible polymer:pigment=30:70 to 60:40.

[0024] In addition to the water-dispersible polymer, the coating layer may optionally contain various additives conventionally known in the field of coated paper. Examples of additives include, but are not limited to, water-soluble polymers, surfactants, dispersants, thickeners, water-retention agents, antifoaming agents, colorants, lubricants such as wax, water-resistant agents, and rust inhibitors. The water-soluble polymer may be a water-soluble polymer conventionally known as a water-soluble binder, such as starches, cellulose derivatives such as carboxymethyl cellulose and hydroxyethyl cellulose, natural polymer resins or derivatives thereof such as casein, gelatin, and soy protein, polyvinylpyrrolidone, polyvinyl alcohol and various modified polyvinyl alcohols thereof, polypropylene glycol, and polyethylene glycol. Examples of starches include starch, oxidized starch, enzyme-modified starch, etherified starch, cationic starch, amphoteric starch, dialdehyde starch, esterified starches such as phosphate-esterified starch and urea-phosphate-esterified starch, hydroxyethylated starch, and hydroxybutylated starch. In this specification, the term "water-soluble" for a water-soluble polymer means that the solubility in water at 25° C. is 10 g / L or more. Examples of the wax include natural waxes such as waxes derived from animals or plants (e.g., beeswax, carnauba wax, etc.), mineral waxes (e.g., microcrystalline wax, etc.), and petroleum wax; and synthetic waxes such as polyolefin wax, paraffin wax, and polyester wax.

[0025] In one embodiment, the coating amount of the coating layer is 2 g / m in terms of dry solid content. 2 More than 45g / m 2 Preferably, it is 2 g / m or less. 2 More than 30g / m 2 More preferably, it is:

[0026] In one aspect, the packaging laminate of the present embodiment preferably has one coating layer on at least one side of the paper support, and the one coating layer preferably contains mainly a water-dispersible polymer and a pigment. In some embodiments, the coating layer comprises a single coating layer adjacent to the support, and the single coating layer mainly contains a water-dispersible polymer and a pigment. In this specification, "a single coating layer mainly contains a water-dispersible polymer and a pigment" means that the total content of the water-dispersible polymer and the pigment in the single coating layer is, for example, 70 to 100% by mass, preferably 80 to 100% by mass, and more preferably 90 to 100% by mass, relative to the single coating layer.

[0027] In one aspect, the packaging laminate of this embodiment preferably has two or more coating layers on at least one side of the paper support, and more preferably has two coating layers. In this specification, of the two coating layers, the coating layer adjacent to the paper support is referred to as the first coating layer, and the coating layer located outside the first coating layer relative to the paper support is referred to as the second coating layer. In some embodiments, the coating layer comprises a first coating layer adjacent to the paper substrate and a second coating layer located outside the first coating layer relative to the paper substrate, the first coating layer primarily containing a water-dispersible polymer and a pigment, and the second coating layer primarily containing a water-dispersible polymer.

[0028] In some embodiments, the first coating layer mainly contains a water-dispersible polymer and a pigment. In this specification, the phrase "the first coating layer mainly contains a water-dispersible polymer and a pigment" means that the total content of the water-dispersible polymer and the pigment in the first coating layer is, for example, 70 to 100% by mass, preferably 80 to 100% by mass, and more preferably 90 to 100% by mass, relative to the mass of the first coating layer. The water-dispersible polymer in the first coating layer may be any of the water-dispersible polymers described above. In one embodiment, the water-dispersible polymer in the first coating layer is preferably a modified polyolefin resin such as an ethylene-acrylic acid copolymer, an ethylene-methacrylic acid copolymer, an ethylene-vinyl acetate copolymer, or an ethylene-vinyl alcohol copolymer; an acrylic resin such as an acrylic acid ester or methacrylic acid ester polymer or a methyl methacrylate-butadiene copolymer; a conjugated diene resin such as a styrene-butadiene copolymer or an acrylonitrile-butadiene copolymer; a styrene-acrylic resin such as a styrene-acrylic copolymer or a styrene-methacrylic copolymer; a polyurethane resin; or an ionomer resin obtained by crosslinking the above resins with metal ions, more preferably a modified polyolefin resin, a conjugated diene resin, or a styrene-acrylic resin, and even more preferably a modified polyolefin resin, a styrene-butadiene copolymer, or a styrene-acrylic resin. The water-dispersible polymer used in the first coating layer may be a commercially available product. Examples of commercially available water-dispersible polymers include, but are not limited to, conjugated diene resins, acrylic resins, or styrene-acrylic resins sold by BASF, conjugated diene resins sold by Asahi Kasei Corporation, conjugated diene resins sold by Nippon A&L Inc., conjugated diene resins sold by Nippon Zeon Co., Ltd., modified polyolefin resins or modified polyolefin ionomer resins sold by Mitsui Chemicals, Inc., and modified polyolefin resins sold by Sumitomo Seika Chemicals Co., Ltd. The pigment in the first coating layer may be any of the pigments described above. In one embodiment, the pigment in the first coating layer is preferably kaolin, precipitated calcium carbonate, ground calcium carbonate, talc, bentonite, or mica. The particle size of the pigment in the first coating layer is preferably in the range of 0.05 to 30 μm in order to obtain a uniform layer. The pigment can have various known shapes such as spherical, lumpy, irregular, and flat, and various shapes can be adopted for the pigment. The pigment preferably has an aspect ratio of 1 to 50. It is also possible to mix pigments with different particle size distributions or different shapes, for example, by mixing a pigment with an average particle size of 1 μm or less with a pigment with an average particle size of 1 μm or more. The mass ratio of the water-dispersible polymer to the pigment in the first coating layer is preferably water-dispersible polymer:pigment=25:75 to 80:20, more preferably water-dispersible polymer:pigment=30:70 to 60:40, and even more preferably 35:65 to 50:50. In some embodiments, the coating weight of the first coating layer is, for example, 1 g / m2 in terms of dry solids. 2 More than 44g / m 2 may be less than or equal to 1 g / m 2 More than 20g / m 2 The following is the result. In addition to the water-dispersible polymer, the first coating layer may optionally contain various additives conventionally known in the field of coated paper. Examples of additives include, but are not limited to, water-soluble polymers, surfactants, dispersants, thickeners, water retention agents, antifoaming agents, colorants, lubricants such as wax, and water-resistant agents. The water-soluble polymers described above can be used. The higher the smoothness of the first coating layer, the more preferable it is in order to make the second coating layer and the vapor deposition layer uniform layers. The Beck smoothness of the first coating layer is, for example, 70 seconds or more, and preferably 300 seconds or more.

[0029] In some embodiments, the second coating layer primarily contains a water-dispersible polymer. As used herein, "the second coating layer primarily contains a water-dispersible polymer" means that the content of the water-dispersible polymer in the second coating layer is, for example, 70 to 100% by mass, preferably 80 to 100% by mass, and more preferably 90 to 100% by mass, relative to the mass of the second coating layer. In one embodiment, the second coating layer contains a water-dispersible polymer but does not contain a pigment. In another embodiment, the second coating layer contains a water-dispersible polymer and a pigment. The water-dispersible polymer in the second coating layer may be any of the water-dispersible polymers described above. The water-dispersible polymer in the second coating layer is preferably a modified polyolefin resin such as an ethylene-acrylic acid copolymer, an ethylene-methacrylic acid copolymer, an ethylene-vinyl acetate copolymer, or an ethylene-vinyl alcohol copolymer; a polyurethane resin; a chlorine-based resin such as polyvinyl chloride or polyvinylidene chloride; an acrylic resin such as an acrylic acid ester or methacrylic acid ester polymer or a methyl methacrylate butadiene copolymer; an alkyd resin; or a polyester resin, more preferably a modified polyolefin resin, a polyurethane resin, a polyester resin, or a chlorine-based resin, and even more preferably a modified polyolefin resin, a polyurethane resin, a polyester resin, or a polyvinylidene chloride. The water-dispersible polymer in the second coating layer may be a commercially available product. Examples of commercially available water-dispersible polymers include modified polyolefin resins or modified polyolefin ionomer resins sold by Mitsui Chemicals, Inc., modified polyolefin resins sold by Sumitomo Seika Chemicals, Inc., polyurethane resins sold by Mitsui Chemicals, Inc., polyurethane resins sold by DIC Corporation, polyurethane resins sold by Dainichiseika Color & Chemicals Mfg. Co., Ltd., polyester resins sold by Unitika Ltd., biodegradable resins sold by Miyoshi Oil & Fats Co., Ltd., acrylic resins sold by Seiko PMC Corporation, chlorine-based resins sold by Solvay, and chlorine-based resins sold by Nissin Chemical Industry Co., Ltd., but are not limited to these. The pigment in the second coating layer may be any of the pigments described above. In one embodiment, the pigment in the second coating layer is preferably kaolin, light calcium carbonate, ground calcium carbonate, talc, bentonite, or mica. The particle size of the pigment in the second coating layer is preferably in the range of 0.05 to 10 μm in order to obtain a uniform layer. The pigment can have various known shapes, such as spherical, lumpy, irregular, or tabular, and various shapes can be used for the pigment. The pigment preferably has an aspect ratio of 1 to 50. It is also possible to mix pigments with different particle size distributions or different shapes, for example, by mixing a pigment with an average particle size of 1 μm or less with a pigment with an average particle size of 1 μm or more. The mass ratio of the water-dispersible polymer to the pigment in the second coating layer is preferably water-dispersible polymer:pigment=60:40 to 100:0, more preferably water-dispersible polymer:pigment=70:30 to 100:0, and even more preferably 80:20 to 100:0. In some embodiments, the coating weight of the second coating layer is 1 g / m2 in terms of dry solids. 2 More than 10g / m 2 It can be the following: In addition to the water-dispersible polymer, the second coating layer may optionally contain various additives conventionally known in the field of coated paper. Examples of additives include, but are not limited to, water-soluble polymers, surfactants, dispersants, thickeners, water retention agents, antifoaming agents, colorants, lubricants such as wax, water-resistant agents, and rust inhibitors. The water-soluble polymers described above can be used. A higher smoothness of the second coating layer is preferable in order to form a uniform vapor-deposited layer. The Beck smoothness of the second coating layer is, for example, 70 seconds or more, preferably 300 seconds or more.

[0030] In some embodiments, it is preferred that the amount of pigment in the first coating layer is greater than the amount of pigment in the second coating layer.

[0031] In one embodiment, the total coating amount of the first coating layer and the second coating layer is 2 g / m in terms of dry solid content. 2 More than 45g / m 2Preferably, it is 2 g / m or less. 2 More than 30g / m 2 More preferably, it is:

[0032] ·Vapour-deposited layer The packaging laminate of this embodiment has a vapor-deposited layer on the outer side of the coating layer relative to the paper substrate and on only one side of the paper substrate. The vapor-deposited layer is preferably a metal vapor-deposited layer, and examples of metals for the vapor-deposited layer include, but are not limited to, aluminum, gold, silver, copper, zinc, and titanium. The metals may be used alone or in combination of two or more. In one embodiment, the vapor-deposited layer is an aluminum vapor-deposited layer. The vapor deposition layer can be formed by a known vapor deposition method such as vacuum vapor deposition or chemical vapor deposition. The thickness of the vapor-deposited layer is not particularly limited and may be, for example, 1 nm or more and 1000 nm or less, for example, 5 nm or more and 500 nm or less, or for example, 10 nm or more and 100 nm or less. The smoothness of the vapor-deposited layer usually depends on the smoothness of the second coating layer.

[0033] In some aspects, the packaging laminate of this embodiment has a paper substrate, one or more coating layers on only one side of the paper substrate, and a vapor deposition layer on the outer side of the coating layer relative to the paper substrate and on only one side of the paper substrate. In some embodiments, the packaging laminate of this embodiment has a paper substrate, one or more coating layers on both sides of the paper substrate, and a vapor deposition layer on the outer side of the coating layers relative to the paper substrate and on only one side of the paper substrate.

[0034] Beck smoothness In the packaging laminate of this embodiment, the Beck smoothness of the surface of the packaging laminate that does not have a vapor-deposited layer relative to the paper substrate is 20 seconds or more and 700 seconds or less, preferably 30 seconds or more and 700 seconds or less, and more preferably 40 seconds or more and 500 seconds or less. This results in a packaging laminate with good storage stability. In this specification, Beck smoothness is a value used to evaluate the surface roughness of paper, measured using a method conforming to JIS P8119:1998 "Paper and paperboard - Smoothness test method using a Beck surface roughness tester." It is the time (unit: seconds) required for a certain amount of atmospheric air to flow between a test piece and a ring-shaped flat surface that are in contact under specific conditions under a specific initial pressure differential. Beck smoothness is also sometimes referred to as Beck surface roughness.

[0035] In this specification, the measurement of Beck smoothness is carried out in accordance with the following conditions (1) and (2): (1) When the packaging laminate does not have a coating layer or a printing coating layer (described later) on the side of the paper support that does not have a vapor deposition layer, the Beck smoothness is measured on the side of the paper support that does not have a vapor deposition layer. (2) When the packaging laminate has a coating layer and / or a printing coating layer, etc., as described below, on the side that does not have a vapor deposition layer relative to the paper support of the packaging laminate, the Beck smoothness is measured on the side that has the coating layer and / or printing coating layer, etc. The Beck smoothness can be adjusted by controlling the calendering conditions for the paper support, the coating layer and / or the printing coating layer.

[0036] Water-soluble chloride ion concentration In the packaging laminate of this embodiment, the water-soluble chloride ion concentration in the packaging laminate is 300 mg / kg or less, for example, 10 mg / kg or more and 300 mg / kg or less, preferably 20 mg / kg or more and 300 mg / kg or less, more preferably 30 mg / kg or more and 200 mg / kg or less, and even more preferably 30 mg / kg or more and 150 mg / kg or less. This allows for a packaging laminate with good storage stability to be obtained. In this specification, the concentration of water-soluble chloride ions in the packaging laminate can be determined in accordance with JIS P8144:2006 "Paper, paperboard and pulp - Determination of water-soluble chlorides." The principle of this method is to extract a sample with cold water (room temperature) using a disintegrator, filter the resulting suspension, collect a portion of the filtrate, and measure the chloride ion content by ion chromatography. The concentration of water-soluble chloride ions in the packaging laminate can be adjusted, for example, by adjusting the chloride content in the paper support and / or coating layer.

[0037] Vapor deposition protective layer The packaging laminate of this embodiment may have a vapor-deposited protective layer on the vapor-deposited layer. The vapor-deposited protective layer is a layer for protecting the vapor-deposited layer and may be a known protective layer. The vapor-deposited protective layer is, for example, a layer containing a water-dispersible polymer that can be used in the coating layer, a water-soluble polymer that can be used in the coating layer, or a combination thereof. The vapor-deposited protective layer may contain additives such as surfactants, pigments, antioxidants, antistatic agents, dyes, plasticizers, lubricants such as wax, release agents, and rust inhibitors. The coating amount of the vapor-deposited protective layer is, for example, 0.1 g / m2 in terms of dry solid content. 2 More than 10g / m 2 The thickness of the vapor-deposited protective layer may be, for example, 0.1 μm or more and 10 μm or less.

[0038] Heat seal layer The packaging laminate of this embodiment may have a heat-sealing layer on the vapor-deposited layer or the vapor-deposited protective layer. In this specification, the heat-sealing layer refers to a layer having heat-sealing properties. The heat-sealing layer can be provided by a known method, such as (1) a method of applying a heat-sealing layer coating liquid containing a heat-sealing resin and an aqueous medium such as water to the vapor-deposited layer or the vapor-deposited protective layer of the packaging laminate and drying the applied liquid; (2) a method of laminating a heat-sealing resin to the vapor-deposited layer or the vapor-deposited protective layer of the packaging laminate by a dry lamination method (including a non-solvent dry lamination method) or an extrusion lamination method; or (3) a method of laminating a laminate having a heat-sealing layer on the vapor-deposited layer or the vapor-deposited protective layer of the packaging laminate.

[0039] Examples of heat-sealable resins used in method (1) include conjugated diene resins such as styrene-butadiene copolymers and acrylonitrile-butadiene copolymers; biodegradable resins such as polylactic acid and polybutylene succinate; polyolefin resins such as polyethylene and polypropylene; modified polyolefin resins such as ethylene-acrylic acid copolymers, ethylene-methacrylic acid copolymers, ethylene-vinyl acetate copolymers, and ethylene-vinyl alcohol copolymers; acrylic resins such as acrylic acid ester or methacrylic acid ester polymers or methyl methacrylate-butadiene copolymers; styrene-acrylic resins such as styrene-acrylic copolymers and styrene-methacrylic copolymers; and ionomer resins obtained by crosslinking the above resins with metal ions. Furthermore, commercially available heat-sealable resins can be used as the heat-sealable resins used in method (1). Examples of commercially available heat-sealable resins include, but are not limited to, AQUENCE (registered trademark) EPIX (registered trademark) BC900F and AQUENCE EPIX BC9210 (styrene-acrylic resins, acrylic resins, or modified polyolefin resins sold by Henkel), Chemipearl S100, Chemipearl S-300, and Chemipearl S-500 (modified polyolefin ionomer resins sold by Mitsui Chemicals, Inc.); ZAIKXEN AC (modified polyolefin resin sold by Sumitomo Seika Chemicals Co., Ltd.); HYDRECT (registered trademark) HS (modified olefin resin sold by DIC Corporation); Michem (registered trademark) Flex HS-100, Michem Flex HS-333, and Michem Prime 498345N (acrylic resins sold by Michelman); and AQUATEX (registered trademark) EC1200 and AQUATEX EC3500 (modified polyolefin resins sold by Japan Coating Resins). The heat seal layer formed by the method (1) may contain additives such as surfactants, pigments, antioxidants, antistatic agents, dyes, plasticizers, lubricants such as wax, release agents, and rust inhibitors. The coating amount of the heat seal layer is, for example, 1 g / m2 in terms of dry solid content. 2 More than 20g / m 2The thickness of the heat seal layer may be, for example, 0.5 μm or more and 25 μm or less.

[0040] Known thermoplastic resins can be used as the heat-sealable resin used in method (2). Examples of heat-sealable resins used in method (2) include ethylene-based resins such as low-density polyethylene resin (LDPE), medium-density polyethylene resin (MDPE), linear low-density polyethylene resin (LLDPE), ethylene-vinyl acetate copolymer (EVA), ethylene-α-olefin copolymer, and ethylene-(meth)acrylic acid copolymer; blends of polyethylene and polybutene; polypropylene-based resins such as homopolypropylene resin (PP), propylene-ethylene random copolymer, propylene-ethylene block copolymer, and propylene-α-olefin copolymer; polylactic acid (PLA), polybutylene succinate (PBS), polybutylene succinate adipate (PBSA), and 3-hydroxybutanoic acid-3-hydroxyhexanoic acid copolymer (PHBH). For processing reasons, the melt flow rate (MFR) of the heat-sealable resin used in method (2) is preferably 0.1 to 50 g / 10 min. The heat-sealable resin used in method (2) can also be a biomass-derived resin. For example, 5 to 60 mass% of the heat-sealable resin in the heat-sealable layer can be a biomass-derived heat-sealable resin. The heat-sealable layer provided in method (2) may also contain known resins and / or additives other than the heat-sealable resin. The additives are not particularly limited, but examples thereof include antioxidants, lubricants, antiblocking agents, flame retardants, ultraviolet absorbers, light stabilizers, antistatic agents, colorants, and crosslinking agents. When providing a heat seal layer, lamination can be performed using an adhesive. The adhesive to be used is not particularly limited, and may be any of a solventless adhesive, an organic solvent adhesive, a water-based adhesive, etc. From the viewpoint of odor and environmental considerations, it is preferable to use a solventless adhesive or a water-based adhesive. Furthermore, the adhesive may be used alone or in combination of two or more types.

[0041] When a heat seal layer is provided by method (3), lamination can be performed using an adhesive in the same manner as in method (2) above. As a laminate having a heat seal layer, for example, a known laminate in which a heat seal layer is provided on one or both sides of cellophane or OPP film can be used.

[0042] When the packaging laminate of this embodiment has a heat seal layer, the heat seal strength is preferably 2 N / 15 mm or more, more preferably 3.5 N / 15 mm or more. Although it depends on the thickness of the packaging laminate and the structure of the heat sealer, the heat seal temperature is preferably 60 to 180°C, more preferably 80 to 130°C. Furthermore, when heat sealing, patterns such as horizontal grain seals, vertical grain seals, and matting can also be used.

[0043] Printing coating layer The packaging laminate of this embodiment may have a printing coating layer for various printing methods, such as gravure printing, offset printing, screen printing, flexographic printing, inkjet printing, UV printing, and EB printing, on the side of the paper support that does not have the vapor deposition layer. This improves the printability of the packaging laminate. The printing coating layer is, for example, a layer that primarily contains a pigment, a water-dispersible polymer, and / or a water-soluble polymer. In this specification, the phrase "the printing coating layer primarily contains a pigment, a water-dispersible polymer, and / or a water-soluble polymer" means that the total content of the pigment, water-dispersible polymer, and / or binder in the printing coating layer is, for example, 70 to 100% by mass, preferably 80 to 100% by mass, and more preferably 90 to 100% by mass, based on the printing coating layer. Examples of pigments include, but are not limited to, inorganic pigments such as various kaolins, light calcium carbonate, heavy calcium carbonate, talc, barium sulfate, titanium dioxide, zinc oxide, zinc sulfide, zinc carbonate, satin white, silica, aluminum silicate (e.g., bentonite), potassium aluminum silicate (e.g., mica), diatomaceous earth, activated clay, alumina, alumina hydrate, aluminum hydroxide, lithopone, zeolite, magnesium carbonate, and magnesium hydroxide. In one embodiment, the pigment in the printing coating layer is preferably various kaolins, light calcium carbonate, heavy calcium carbonate, or a combination thereof. In one embodiment, the amount of pigment in the printing coating layer can be 50 to 90% by mass of the printing coating layer. Examples of water-dispersible polymers include polyolefin resins such as polyethylene and polypropylene; modified polyolefin resins such as ethylene-acrylic acid copolymer, ethylene-methacrylic acid copolymer, ethylene-vinyl acetate copolymer, and ethylene-vinyl alcohol copolymer; styrene resins such as polystyrene, acrylonitrile styrene, and acrylonitrile butadiene styrene; conjugated diene resins such as styrene-butadiene copolymer and acrylonitrile butadiene copolymer; acrylic resins such as acrylic acid ester or methacrylic acid ester polymers or methyl methacrylate butadiene copolymer; styrene-acrylic resins such as styrene-acrylic copolymer and styrene-methacrylic copolymer; polyurethane resins; chlorine-based resins such as polyvinyl chloride and polyvinylidene chloride; alkyd resins; polyester resins; or functional group-modified resins of these copolymers using functional group-containing monomers such as carboxyl groups; ionomer resins obtained by crosslinking the above resins with metal ions; thermosetting synthetic resins such as melamine resin and urea resin; biodegradable resins such as polylactic acid and polybutylene succinate; and natural rubber. In one embodiment, the water-dispersible polymer in the printing coating layer is preferably a styrene-acrylic resin or a conjugated diene resin, more preferably a styrene-butadiene copolymer resin, and the amount of the water-dispersible polymer in the printing coating layer may be 9 to 40% by mass relative to the printing coating layer. The water-soluble polymer may be any conventionally known water-soluble polymer, examples of which include starches, cellulose derivatives such as carboxymethyl cellulose and hydroxyethyl cellulose, natural polymer resins or derivatives thereof such as casein, gelatin, and soy protein, polyvinylpyrrolidone, polyvinyl alcohol and various modified polyvinyl alcohols thereof, polypropylene glycol, and polyethylene glycol. Examples of starches include starch, oxidized starch, enzyme-modified starch, etherified starch, cationic starch, amphoteric starch, dialdehyde starch, esterified starches such as phosphate-esterified starch and urea-phosphate-esterified starch, hydroxyethylated starch, and hydroxybutylated starch. In one embodiment, the amount of water-soluble polymer in the printing coating layer may be 1 to 20% by mass of the printing coating layer. The printing coating layer may contain any additives such as dispersants, lubricants, thickeners, flow improvers, antifoaming agents, foaming agents, penetrating agents, color pigments, color dyes, fluorescent brighteners, ultraviolet absorbers, antioxidants, preservatives, and mildew inhibitors. The coating weight of the printing coating layer can be appropriately set depending on the application of the packaging laminate. In one embodiment, the coating weight of the printing coating layer is 1 g / m2 in terms of dry solid content. 2 More than 20g / m 2 may be less than or equal to 3 g / m 2 More than 10g / m 2 The following is the result.

[0044] [Method of manufacturing packaging laminate] Packaging laminates can be produced by providing a coating layer on a paper support, providing a vapor-deposited layer on the coating layer, and optionally providing a vapor-deposited protective layer, a heat-sealing layer, and a printing coating layer. The method for providing the coating layer, vapor-deposited protective layer, heat-sealing layer, and printing coating layer is not particularly limited. For example, a method using a coating device and a drying device conventionally known in the papermaking field can be used to apply and dry the coating liquids for forming the coating layer, vapor-deposited protective layer, the heat-sealing layer corresponding to method (1) above, and the printing coating layer to the target object. The medium for the coating liquid is preferably an aqueous medium such as water or alcohol water, with water being more preferred. Examples of coating devices include a film press coater, a rod coater, an air knife coater, a rod blade coater, a bar coater, a blade coater, a gravure coater, a curtain coater, an E-bar coater, and a film transfer coater. Examples of the drying apparatus include various drying apparatuses such as hot air dryers such as a linear tunnel dryer, an arch dryer, an air loop dryer, and a sine curve air float dryer, an infrared heating dryer, a dryer that uses microwaves, etc. The vapor deposition layer can be formed by a known vapor deposition method such as a vacuum deposition method or a chemical vapor deposition method.

[0045] The packaging laminate of this embodiment can be used with various conventionally known printing methods such as gravure printing, offset printing, screen printing, flexographic printing, inkjet printing, UV printing, EB printing, etc. Packaging laminates that have been printed are also included in the packaging laminate of this embodiment.

[0046] The packaging laminate of this embodiment preferably has a tensile strength of 1 to 10 kN / m as specified in JIS P8113:2006, and a tensile strength ratio in the machine direction / cross direction of 5 / 1 to 1 / 5. The packaging laminate of this embodiment preferably has a tear strength of 100 to 2000 mN as specified in JIS P8116:2000, and a tear strength ratio in the machine direction / cross direction of 5 / 1 to 1 / 5. The density of the packaging laminate of this embodiment is not particularly limited. In some embodiments, the density of the paper support is 0.5 to 1.3 g / cm.3 It could be.

[0047] [Applications of packaging laminates] The packaging laminate of this embodiment can be suitably used as a packaging material for constituting packaged products in which various items such as food and drink, pharmaceuticals, chemicals, electronic components, cosmetics, sanitary products, daily necessities, etc. One embodiment of the present invention is a packaging material made of the packaging laminate of the above embodiment. The packaging laminate of this embodiment can be made into bags of known shapes, such as vertical pillow packaging bags, horizontal pillow packaging bags, side seal bags, two-sided seal bags, three-sided seal bags, gusset bags, bottom gusset bags, and stand-up bags, and can be used. [Example]

[0048] The present invention will be described in more detail below with reference to examples. However, the present invention is not limited to these examples. Here, unless otherwise specified, "parts by mass" and "% by mass" represent the amount of dry solids or the amount of substantial components, respectively. Furthermore, the coating amount represents the quantity of dry solids. The "front surface" and "back surface" of the packaging laminate or paper support are denoted for convenience, with the "front surface" referring to the side having the vapor-deposited layer and the "back surface" referring to the side not having the vapor-deposited layer.

[0049] [Manufacturing of packaging laminates] Example 1 <Paper support> The following paper stock was prepared using ion-exchanged water as a medium. LBKP (freeness 350~480mlcsf) 50 parts by mass NBKP (Freeness 350~480mlcsf) 50 parts by mass Rosin sizing agent (CC1404, Seiko PMC Co., Ltd.) 0.4 parts by mass Paper strength agent 0.9 parts by mass

[0050] The paper stock with the above composition was made into paper using a Fourdrinier paper machine, and oxidized starch was added as a surface sizing agent using a size press at 1 g / m per side. 2 After washing with ion-exchanged water, the surface is coated with a 50g / m2 2A paper support of 1000 ppm was obtained.

[0051] <Application of sodium chloride and aluminum sulfate> A sodium chloride and aluminum sulfate aqueous solution 1 having the following composition was applied to the backside of the paper support using an air knife coater in an amount of 20 g / m 2 The coating was carried out so that the thickness was 100 μm and then dried in a hot air dryer.

[0052] <Sodium chloride and aluminum sulfate aqueous solution 1> Ion-exchanged water 199.31090kg Sodium chloride 0.18910kg Aluminum sulfate 0.50000Kg

[0053] <Coating of the first coating layer, coating of the second coating layer> The first coating layer coating solution 1 having the following composition was applied to the surface of the paper support using an air knife coater in an amount of 10 g / m 2 Then, the second coating layer coating solution 1 having the following composition was applied to the undercoat layer with an air knife coater in an amount of 5 g / m 2 The coating was carried out so that the thickness was 100 μm and then dried in a hot air dryer.

[0054] <First coating layer coating liquid 1> Using ion-exchanged water as a medium, a first coating layer coating solution 1 was prepared having the following composition. Kaolin 150 parts by mass Styrene butadiene copolymer 150 parts by mass

[0055] <Second coating layer coating liquid 1> The following second coating layer coating solution 1 was prepared using ion-exchanged water as a medium. Polyurethane resin 100 parts by mass

[0056] After drying, the paper support coated with the first and second coating layers was subjected to a calendering treatment using a supercalender, whereby the calendering conditions were controlled to adjust the Beck smoothness on the back side of the paper support as required in accordance with JIS P8119:1998.

[0057] <Vapor deposition> Using a vacuum heating vapor deposition apparatus, an aluminum vapor-deposited layer (50 nm thick) was formed on the second coating layer to obtain a packaging laminate 1 having a coating layer and a vapor-deposited layer. The Beck smoothness of the back surface of the packaging laminate 1, as determined in accordance with JIS P8119:1998, was 70 seconds. The aluminum sulfate concentration in the paper support of the packaging laminate 1 was 0.1% by mass, and the water-soluble chloride ion concentration in the packaging laminate 1 was 300 mg / kg.

[0058] Example 2 A packaging laminate 2 was obtained in the same manner as in Example 1, except that a sodium chloride and aluminum sulfate aqueous solution 2 having the following composition was used instead of the sodium chloride and aluminum sulfate aqueous solution 1 of Example 1. Here, the concentration of aluminum sulfate in the paper support of packaging laminate 2 was 0.3 mass %, and the concentration of water-soluble chloride ions in packaging laminate 2 was 300 mg / kg.

[0059] <Sodium chloride and aluminum sulfate aqueous solution 2> Ion-exchanged water 198.31060kg Sodium chloride 0.18940Kg Aluminum sulfate 1.50000Kg

[0060] Example 3 A packaging laminate 3 was obtained in the same manner as in Example 1, except that a sodium chloride and aluminum sulfate aqueous solution 3 having the following composition was used instead of the sodium chloride and aluminum sulfate aqueous solution 1 of Example 1. Here, the concentration of aluminum sulfate in the paper support of packaging laminate 3 was 1.5 mass %, and the concentration of water-soluble chloride ions in packaging laminate 3 was 300 mg / kg.

[0061] <Sodium chloride and aluminum sulfate aqueous solution 3> Ion-exchanged water 192.68800kg Sodium chloride 0.19120 kg Aluminum sulfate 7.64000kg

[0062] Example 4 A packaging laminate 4 was obtained in the same manner as in Example 1, except that an aqueous solution of sodium chloride and aluminum sulfate 4 having the following composition was used instead of the aqueous solution of sodium chloride and aluminum sulfate 1 of Example 1. Here, the concentration of aluminum sulfate in the paper support of packaging laminate 4 was 2.0 mass %, and the concentration of water-soluble chloride ions in packaging laminate 4 was 300 mg / Kg.

[0063] <Sodium chloride and aluminum sulfate aqueous solution 4> Ion-exchanged water 189.60810kg Sodium chloride 0.19190kg Aluminum sulfate 10.20000kg

[0064] Example 5 A packaging laminate 5 was obtained in the same manner as in Example 1, except that a sodium chloride and aluminum sulfate aqueous solution 5 having the following composition was used instead of the sodium chloride and aluminum sulfate aqueous solution 1 of Example 1. Here, the concentration of aluminum sulfate in the paper support of packaging laminate 5 was 1.0 mass %, and the concentration of water-soluble chloride ions in packaging laminate 5 was 30 mg / kg.

[0065] <Sodium chloride and aluminum sulfate aqueous solution 5> Ion-exchanged water 194.93690kg Sodium chloride 0.01310Kg Aluminum sulfate 5.05000Kg

[0066] Example 6 A packaging laminate 6 was obtained in the same manner as in Example 1, except that a sodium chloride and aluminum sulfate aqueous solution 6 having the following composition was used instead of the sodium chloride and aluminum sulfate aqueous solution 1 of Example 1. Here, the concentration of aluminum sulfate in the paper support of the packaging laminate 6 was 1.0 mass %, and the concentration of water-soluble chloride ions in the packaging laminate 6 was 50 mg / Kg.

[0067] <Sodium chloride and aluminum sulfate aqueous solution 6> Ion-exchanged water 194.92374 kg Sodium chloride 0.02626 kg Aluminum sulfate 5.05000Kg

[0068] Example 7 Packaging laminate 7 was obtained in the same manner as in Example 1, except that sodium chloride and aluminum sulfate aqueous solution 7 having the following composition was used instead of sodium chloride and aluminum sulfate aqueous solution 1 of Example 1. Here, the concentration of aluminum sulfate in the paper support of packaging laminate 7 was 1.0 mass %, and the concentration of water-soluble chloride ions in packaging laminate 7 was 70 mg / kg.

[0069] <Sodium chloride and aluminum sulfate aqueous solution 7> Ion-exchanged water 194.91061kg Sodium chloride 0.03939 kg Aluminum sulfate 5.05000Kg

[0070] Example 8 A packaging laminate 8 was obtained in the same manner as in Example 1, except that an aqueous solution of sodium chloride and aluminum sulfate 8 having the following composition was used instead of the aqueous solution of sodium chloride and aluminum sulfate 1 of Example 1. Here, the concentration of aluminum sulfate in the paper support of packaging laminate 8 was 1.0 mass %, and the concentration of water-soluble chloride ions in packaging laminate 8 was 150 mg / Kg.

[0071] <Sodium chloride and aluminum sulfate aqueous solution 8> Ion-exchanged water 194.85809 kg Sodium chloride 0.09191kg Aluminum sulfate 5.05000Kg

[0072] Example 9 A packaging laminate 9 was obtained in the same manner as in Example 1, except that a sodium chloride and aluminum sulfate aqueous solution 9 having the following composition was used instead of the sodium chloride and aluminum sulfate aqueous solution 1 of Example 1. Here, the concentration of aluminum sulfate in the paper support of packaging laminate 9 was 1.0 mass %, and the concentration of water-soluble chloride ions in packaging laminate 9 was 300 mg / Kg.

[0073] <Sodium chloride and aluminum sulfate aqueous solution 9> Ion-exchanged water 194.6360 kg Sodium chloride 0.19040kg Aluminum sulfate 5.05000Kg

[0074] Example 10 A packaging laminate 10 was obtained in the same manner as in Example 7, except that the calendering conditions were controlled for the paper substrate coated with the first and second coating layers in Example 7 to change the Beck smoothness on the back surface of the paper substrate as determined in accordance with JIS P8119:1998. Here, the Beck smoothness on the back surface of the packaging laminate 10 as determined in accordance with JIS P8119:1998 was 20 seconds.

[0075] Example 11 A packaging laminate 11 was obtained in the same manner as in Example 7, except that the calendering conditions were controlled for the paper support coated with the first and second coating layers in Example 7 to change the Beck smoothness on the back surface of the paper support as determined in accordance with JIS P8119:1998. Here, the Beck smoothness on the back surface of the packaging laminate 11 as determined in accordance with JIS P8119:1998 was 30 seconds.

[0076] Example 12 A packaging laminate 12 was obtained in the same manner as in Example 7, except that the calendering conditions were controlled for the paper support coated with the first and second coating layers in Example 7 to change the Beck smoothness on the back surface of the paper support as determined in accordance with JIS P8119:1998. Here, the Beck smoothness on the back surface of the packaging laminate 12 as determined in accordance with JIS P8119:1998 was 40 seconds.

[0077] Example 13 A packaging laminate 13 was obtained in the same manner as in Example 7, except that the calendering conditions were controlled for the paper support coated with the first and second coating layers in Example 7 to change the Beck smoothness on the back surface of the paper support as determined in accordance with JIS P8119:1998. Here, the Beck smoothness on the back surface of the packaging laminate 13 as determined in accordance with JIS P8119:1998 was 250 seconds.

[0078] Example 14 Instead of the sodium chloride and aluminum sulfate aqueous solution 7 in Example 7, a sodium chloride and aluminum sulfate aqueous solution 10 having the following composition was used, and after coating and drying the surface of the paper support, a printing coating layer coating solution 1 having the following composition was applied to the back of the paper support using an air knife coater in an amount of 5 g / m 2 The packaging laminate 14 was obtained in the same manner as in Example 7, except that the coating was carried out so that the coating became as shown in Table 1, the coating was dried in a hot air dryer, and then calendared. Here, the Beck smoothness of the back surface of the packaging laminate 14, as determined in accordance with JIS P8119:1998, was 500 seconds, the concentration of aluminum sulfate in the paper support of the packaging laminate 14 was 1.0 mass%, and the concentration of water-soluble chloride ions in the packaging laminate 14 was 70 mg / Kg. there were.

[0079] <Sodium chloride and aluminum sulfate aqueous solution 10> Ion-exchanged water 194.91061kg Sodium chloride 0.03939 kg Aluminum sulfate 5.05000Kg

[0080] <Printing coating layer coating liquid 1> The following printing coating layer coating solution 1 was prepared using ion-exchanged water as a medium. Kaolin 70 parts by mass Phosphate esterified starch 3 parts by mass Styrene butadiene copolymer 24 parts by mass

[0081] Example 15 A packaging laminate 15 was obtained in the same manner as in Example 14, except that the calendering conditions for the coated paper support of Example 14 were controlled to change the Beck smoothness of the printing coating layer surface determined in accordance with JIS P8119:1998. The Beck smoothness of the back surface of the packaging laminate 15 determined in accordance with JIS P8119:1998 was 700 seconds.

[0082] Example 16 Instead of the aqueous solution of sodium chloride and aluminum sulfate 7 in Example 7, an aqueous solution of sodium chloride and aluminum sulfate 11 having the following composition was used, and the coating amount of the first coating layer coating solution 1 was 1 g / m 2 and the coating amount of the second coating layer coating liquid 1 is 1 g / m 2 A packaging laminate 16 was obtained in the same manner as in Example 7, except that the aluminum sulfate concentration in the paper support of the packaging laminate 16 was 1.0 mass %, and the water-soluble chloride ion concentration in the packaging laminate 16 was 70 mg / Kg.

[0083] <Sodium chloride and aluminum sulfate aqueous solution 11> Ion-exchanged water 194.91841 kg Sodium chloride 0.03159 kg Aluminum sulfate 5.05000Kg

[0084] Example 17 Instead of the aqueous solution of sodium chloride and aluminum sulfate 7 in Example 7, an aqueous solution of sodium chloride and aluminum sulfate 12 having the following composition was used, and the coating amount of the first coating layer coating solution 1 was set to 3 g / m 2 and the coating amount of the second coating layer coating liquid 1 is 1 g / m 2 A packaging laminate 17 was obtained in the same manner as in Example 7, except that the aluminum sulfate concentration in the paper support of the packaging laminate 17 was 1.0 mass %, and the water-soluble chloride ion concentration in the packaging laminate 17 was 70 mg / Kg.

[0085] <Sodium chloride and aluminum sulfate aqueous solution 12> Ion-exchanged water 194.91271kg Sodium chloride 0.03729 kg Aluminum sulfate 5.05000Kg

[0086] Example 18 Instead of the aqueous solution of sodium chloride and aluminum sulfate 7 in Example 7, an aqueous solution of sodium chloride and aluminum sulfate 13 having the following composition was used, and the coating amount of the first coating layer coating solution 1 was 8 g / m 2 and the coating amount of the second coating layer coating liquid 1 is 2 g / m 2 A packaging laminate 18 was obtained in the same manner as in Example 7, except that the aluminum sulfate concentration in the paper support of the packaging laminate 18 was 1.0 mass %, and the water-soluble chloride ion concentration in the packaging laminate 18 was 70 mg / Kg.

[0087] <Sodium chloride and aluminum sulfate aqueous solution 13> Ion-exchanged water 194.91360kg Sodium chloride 0.03640Kg Aluminum sulfate 5.05000Kg

[0088] Example 19 Instead of the aqueous solution of sodium chloride and aluminum sulfate 7 in Example 7, an aqueous solution of sodium chloride and aluminum sulfate 14 having the following composition was used, and the coating amount of the first coating layer coating solution 1 was 20 g / m 2 and the coating amount of the second coating layer coating liquid 1 is 10 g / m 2 A packaging laminate 19 was obtained in the same manner as in Example 7, except that the aluminum sulfate concentration in the paper support of the packaging laminate 19 was 1.0 mass %, and the water-soluble chloride ion concentration in the packaging laminate 19 was 70 mg / Kg.

[0089] <Sodium chloride and aluminum sulfate aqueous solution 14> Ion-exchanged water 194.90161kg Sodium chloride 0.04839 kg Aluminum sulfate 5.05000Kg

[0090] Example 20 Instead of the aqueous solution of sodium chloride and aluminum sulfate 7 in Example 7, an aqueous solution of sodium chloride and aluminum sulfate 15 having the following composition was used, and the coating amount of the first coating layer coating solution 1 was 45 g / m 2 and the coating amount of the second coating layer coating liquid 1 is 0 g / m 2 A packaging laminate 20 was obtained in the same manner as in Example 7, except that the aluminum sulfate concentration in the paper support of the packaging laminate 20 was 1.0 mass %, and the water-soluble chloride ion concentration in the packaging laminate 20 was 70 mg / Kg.

[0091] <Sodium chloride and aluminum sulfate aqueous solution 15> Ion-exchanged water 194.89261 kg Sodium chloride 0.05739 kg Aluminum sulfate 5.05000Kg

[0092] Example 21 A packaging laminate 21 was obtained in the same manner as in Example 7, except that a first coating layer coating solution 2 having the following formulation was used instead of the first coating layer coating solution 1 of Example 7. Here, the concentration of aluminum sulfate in the paper support of the packaging laminate 21 was 1.0 mass %, and the concentration of water-soluble chloride ions in the packaging laminate 21 was 70 mg / Kg.

[0093] <First coating layer coating liquid 2> The following first coating layer coating liquid 2 was prepared using ion-exchanged water as a medium. Kaolin 150 parts by mass Styrene acrylic resin 100 parts by mass

[0094] Example 22 A packaging laminate 22 was obtained in the same manner as in Example 7, except that a second coating layer coating solution 2 having the following formulation was used instead of the second coating layer 1 of Example 7. Here, the concentration of aluminum sulfate in the paper support of the packaging laminate 22 was 1.0 mass %, and the concentration of water-soluble chloride ions in the packaging laminate 22 was 70 mg / Kg.

[0095] <Second coating layer coating liquid 2> The following second coating layer coating solution 2 was prepared using ion-exchanged water as a medium. Polyvinylidene chloride 100 parts by mass

[0096] Example 23 A packaging laminate 23 was obtained in the same manner as in Example 7, except that a potassium chloride and aluminum sulfate aqueous solution 16 having the following composition was used instead of the sodium chloride and aluminum sulfate aqueous solution 7 of Example 7. Here, the concentration of aluminum sulfate in the paper support of packaging laminate 23 was 1.0 mass %, and the concentration of water-soluble chloride ions in packaging laminate 23 was 70 mg / Kg.

[0097] <Potassium chloride and aluminum sulfate aqueous solution 16> Ion-exchanged water 194.89975 kg Potassium chloride 0.05025 kg Aluminum sulfate 5.05000Kg

[0098] Example 24 Instead of the aqueous solution of sodium chloride and aluminum sulfate 7 in Example 7, an aqueous solution of sodium chloride and aluminum sulfate 17 having the following composition was used, and after deposition, a heat seal layer coating solution 1 having the following composition was applied to the surface of the deposited layer using an air knife coater in an amount of 10 g / m 2 and then dried in a hot air dryer, to obtain a packaging laminate 24 in the same manner as in Example 7. Here, the concentration of aluminum sulfate in the paper support of the packaging laminate 24 was 1.0 mass %, and the concentration of water-soluble chloride ions in the packaging laminate 24 was 70 mg / Kg.

[0099] <Potassium chloride and aluminum sulfate aqueous solution 17> Ion-exchanged water 194.90461kg Sodium chloride 0.04539 kg Aluminum sulfate 5.05000Kg

[0100] <Heat seal layer coating liquid 1> The following heat seal layer coating solution 1 was prepared using ion-exchanged water as a medium. Ionomer resin 100 parts by mass

[0101] Example 25 A packaging laminate 25 was prepared in the same manner as in Example 7, except that an aqueous solution 18 of sodium chloride and aluminum sulfate having the following composition was used instead of the aqueous solution 7 of sodium chloride and aluminum sulfate in Example 7. Next, a water-based adhesive (modified polyolefin adhesive) was applied to a thickness of 0.5 g / m on the vapor-deposited surface of the packaging laminate 25. 2 The laminate was then coated with LLDPE (MFR 2.3 g / 10 min, density 0.914 g / cm) using a T-die melt extrusion laminator. 3 ) was laminated onto the vapor-deposited layer surface to a thickness of 20 μm to produce a packaging laminate 25 having a heat-seal layer. Here, the concentration of aluminum sulfate in the paper support of packaging laminate 25 was 1.0 mass %, and the concentration of water-soluble chloride ions in packaging laminate 25 was 70 mg / Kg.

[0102] <Potassium chloride and aluminum sulfate aqueous solution 18> Ion-exchanged water 194.89964 kg Sodium chloride 0.05036 kg Aluminum sulfate 5.05000Kg

[0103] Comparative Example 1 A packaging laminate 26 was obtained in the same manner as in Example 1, except that an aqueous solution of sodium chloride and aluminum sulfate 19 having the following composition was used instead of the aqueous solution of sodium chloride and aluminum sulfate 1 of Example 1. Here, the concentration of aluminum sulfate in the paper support of packaging laminate 27 was 0.0 mass %, and the concentration of water-soluble chloride ions in packaging laminate 26 was 300 mg / Kg.

[0104] <Sodium chloride and aluminum sulfate aqueous solution 19> Ion-exchanged water 199.81110kg Sodium chloride 0.18890kg

[0105] Comparative Example 2 A packaging laminate 27 was obtained in the same manner as in Example 1, except that an aqueous solution of sodium chloride and aluminum sulfate 20 having the following composition was used instead of the aqueous solution of sodium chloride and aluminum sulfate 1 of Example 1. Here, the concentration of aluminum sulfate in the paper support of packaging laminate 27 was 3.0 mass %, and the concentration of water-soluble chloride ions in packaging laminate 27 was 300 mg / Kg.

[0106] <Sodium chloride and aluminum sulfate aqueous solution 20> Ion-exchanged water 184.34660kg Sodium chloride 0.19340Kg Aluminum sulfate 15.46000kg

[0107] Comparative Example 3 In Example 7, the first coating layer coating liquid 3 having the following composition was used instead of the first coating layer coating liquid 1, and the coating amount of the first coating layer coating liquid 3 was 15 g / m 2 , and the coating amount of the second coating layer coating liquid 1 is 0 g / m 2 Packaging laminate 28 was obtained in the same manner as in Example 7, except that the aluminum sulfate concentration in the paper support of packaging laminate 28 was 1.0 mass %, and the water-soluble chloride ion concentration in packaging laminate 28 was 70 mg / Kg.

[0108] <First coating layer coating liquid 2> The following first coating layer coating solution 1 was prepared using ion-exchanged water as a medium. Kaolin 150 parts by mass

[0109] Comparative Example 4 A packaging laminate 29 was obtained in the same manner as in Example 1, except that an aqueous solution of sodium chloride and aluminum sulfate 21 having the following composition was used instead of the aqueous solution of sodium chloride and aluminum sulfate 1 of Example 1. Here, the concentration of aluminum sulfate in the paper support of packaging laminate 29 was 1.0 mass %, and the concentration of water-soluble chloride ions in packaging laminate 29 was 500 mg / Kg.

[0110] <Sodium chloride and aluminum sulfate aqueous solution 21> Ion-exchanged water 194.62820kg Sodium chloride 0.32180kg Aluminum sulfate 5.05000Kg

[0111] Comparative Example 5 A packaging laminate 31 was obtained in the same manner as in Example 7, except that the calendering conditions were controlled for the paper support coated with the first and second coating layers of Example 7 to change the Beck smoothness on the back surface of the packaging laminate determined in accordance with JIS P8119:1998. Here, the Beck smoothness on the back surface of the packaging laminate 30 determined in accordance with JIS P8119:1998 was 10 seconds.

[0112] Comparative Example 6 In Example 15, the following sodium chloride and aluminum sulfate aqueous solution 22 was used, and the coating amount of the printing coating layer was 15 g / m 2 A packaging laminate 31 was obtained in the same manner as in Example 15, except that the calendering conditions were controlled to change the Beck smoothness of the printing coating layer surface as determined in accordance with JIS P8119:1998. The Beck smoothness of the back surface of the packaging laminate 31 as determined in accordance with JIS P8119:1998 was 1000 seconds. The aluminum sulfate concentration in the paper support of the packaging laminate 31 was 1.0 mass%, and the water-soluble chloride ion concentration in the packaging laminate 31 was 70 mg / kg.

[0113] <Sodium chloride and aluminum sulfate aqueous solution 22> Ion-exchanged water 194.90162kg Sodium chloride 0.04838 kg Aluminum sulfate 5.05000Kg

[0114] The water-soluble chloride ion concentration and Beck smoothness of the back surface of the obtained packaging laminate were determined by the following methods. The results are shown in Table 1 together with the aluminum sulfate concentration in the paper support.

[0115] <Water-soluble chloride ion concentration> The concentration of water-soluble chloride ions in the packaging laminate was quantified in accordance with JIS P8144:2006 "Paper, paperboard and pulp - Determination of water-soluble chlorides."

[0116] <Beck smoothness> The Beck smoothness of the back surface of the packaging laminate was measured in accordance with JIS P8119:1998 "Paper and paperboard - Test method for smoothness using a Beck surface roughness tester."

[0117] The obtained packaging laminate was evaluated for adhesion of the vapor-deposited layer and storage stability under high-temperature and high-humidity conditions. The results are shown in Table 1.

[0118] <Adhesion of vapor deposition layer> The adhesion of the vapor-deposited layer of the packaging laminate was evaluated by measuring the resistance of the vapor-deposited layer to peeling. The resistance was measured in accordance with JIS K5600-5-6:1999 "General test methods for paints - Part 5: Mechanical properties of coatings - Section 6: Adhesion (cross-cut method)." The evaluation results were shown as "Test result classifications 0 to 5" specified in JIS K5600-5-6:1999. In the present invention, if the classification is 0 or 1, the packaging laminate is considered to have adhesion.

[0119] <Storability> The storage stability of the packaging laminate was evaluated from two perspectives: the change in surface resistivity of the packaging laminate surface and the change in adhesion of the vapor-deposited layer of the packaging laminate before and after storage. The storage conditions were a temperature of 60°C and a humidity of 90% RH for 30 days.

[0120] <Change in surface resistivity> Each of the resulting packaging laminates was stored for 30 days in an environment at a temperature of 60°C and a humidity of 90% RH. The surface resistivity of each packaging laminate before and after storage was measured. The surface resistivity of the packaging laminate was determined in accordance with JIS K7194:1994, "Testing method for resistivity of conductive plastics by the four-probe method." The greater the difference in surface resistivity of the packaging laminate before and after storage, the more degradation of the vapor-deposited layer occurs, leading to a deterioration in the storage stability of the packaging laminate. In the present invention, a packaging laminate rated A, B, C, or D is deemed to be unlikely to deteriorate in storage stability. A: The surface resistivity after storage is 1.5 times or less compared to the surface resistivity before storage. B: The value of surface resistivity after storage is different from the value of surface resistivity before storage. Inferior to A, less than twice the quality. C: The value of surface resistivity after storage is different from the value of surface resistivity before storage. Inferior to B, less than 3 times. D: The value of surface resistivity after storage is different from the value of surface resistivity before storage. Inferior to C, less than 5 times. E: The surface resistivity after storage is more than 5 times the surface resistivity before storage.

[0121] <Changes in adhesion of vapor deposition layer> Each packaging laminate obtained was stored for 30 days in an environment with a temperature of 60°C and a humidity of 90% RH. The adhesion of the vapor-deposited layer before and after storage was measured as the resistance of the vapor-deposited layer to peeling in accordance with JIS K5600-5-6:1999, "General Test Methods for Paints—Part 5: Mechanical Properties of Coatings—Section 6: Adhesion (Cross-Cut Method)." The test results were classified into categories 0 to 5 according to JIS K5600-5-6:1999. The resulting classification was calculated as "[Classification Number After Storage] - [Classification Number Before Storage]." The larger this value, the more degradation of the vapor-deposited layer occurred, leading to a deterioration in the shelf life of the packaging laminate. In the present invention, a packaging laminate rated A or B is deemed to be less susceptible to deterioration in shelf life. A: The value is 0. B: The value is 1. C: The value is 2 or 3. D: The value is 4 or 5.

[0122] [Table 1]

[0123] From Table 1, it can be seen that the packaging laminates of Examples 1 to 25, which satisfy the constitution of the present invention, have adhesiveness of the vapor deposition layer and are less likely to deteriorate in storage stability when stored in a high-temperature, high-humidity environment. On the other hand, it can be seen that the packaging laminates of Comparative Examples 1 to 6, which do not satisfy the constitution of the present invention, do not satisfy at least one of the above effects. In Comparative Example 3, a good coating layer could not be obtained, and as a result, evaluation was not possible. [Industrial Applicability]

[0124] The present invention relates to a packaging laminate having at least a paper support and a vapor-deposited layer, which is capable of suppressing deterioration of the vapor-deposited layer and a decrease in adhesion of the vapor-deposited layer to adjacent layers during storage in a high-temperature, high-humidity environment. The packaging laminate is particularly useful as a packaging material for constituting packaged products in which various items such as food and beverages, pharmaceuticals, chemicals, electronic components, cosmetics, sanitary products, daily necessities, and the like are filled and packaged. Furthermore, since the packaging laminate of the present invention is made of a paper support, it can reduce the amount of plastic used and make it easier to recycle resources compared to packaging laminates that use a plastic sheet as a support.

Claims

1. A packaging laminate comprising a paper support, one or more coating layers on at least one side of the paper support, and a vapor deposition layer on the outer side of the coating layer relative to the paper support and on only one side of the paper support, the paper support contains aluminum sulfate in an amount of 0.1% by mass or more and 2% by mass or less based on the paper support, the coating layer contains at least a water-dispersible polymer, the Beck smoothness of the packaging laminate on the side not having the vapor deposition layer, based on the paper support, is 20 seconds or more and 700 seconds or less; The water-soluble chloride ion concentration in the packaging laminate is 300 mg / Kg or less. Packaging laminate.

2. The coating amount of the coating layer is 2 g / m ２ 45g / m or more ２ 2. The packaging laminate of claim 1, wherein:

3. the coating layer comprises one coating layer adjacent to the paper support, the one coating layer mainly contains a water-dispersible polymer and a pigment; The packaging laminate according to claim 1 or 2.

4. the coating layer comprises a first coating layer adjacent to the paper support and a second coating layer located outside the first coating layer relative to the paper support; the first coating layer mainly contains a water-dispersible polymer and a pigment, the second coating layer mainly contains a water-dispersible polymer; The packaging laminate according to claim 1 or 2.

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