CN116761718A - Laminate and package using laminate - Google Patents

Laminate and package using laminate Download PDF

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Publication number
CN116761718A
CN116761718A CN202280010427.2A CN202280010427A CN116761718A CN 116761718 A CN116761718 A CN 116761718A CN 202280010427 A CN202280010427 A CN 202280010427A CN 116761718 A CN116761718 A CN 116761718A
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CN
China
Prior art keywords
heat
laminate
layer
copolymer
acrylate
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CN202280010427.2A
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Chinese (zh)
Inventor
榎本肇
菊池�浩
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DIC Graphics Corp
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DIC Graphics Corp
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Publication of CN116761718A publication Critical patent/CN116761718A/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B27/08—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/30—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • 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
    • B65D75/00—Packages comprising articles or materials partially or wholly enclosed in strips, sheets, blanks, tubes, or webs of flexible sheet material, e.g. in folded wrappers
    • B65D75/28—Articles or materials wholly enclosed in composite wrappers, i.e. wrappers formed by associating or interconnecting two or more sheets or blanks
    • B65D75/30—Articles or materials enclosed between two opposed sheets or blanks having their margins united, e.g. by pressure-sensitive adhesive, crimping, heat-sealing, or welding
    • B65D75/32—Articles or materials enclosed between two opposed sheets or blanks having their margins united, e.g. by pressure-sensitive adhesive, crimping, heat-sealing, or welding one or both sheets or blanks being recessed to accommodate contents
    • B65D75/36—Articles or materials enclosed between two opposed sheets or blanks having their margins united, e.g. by pressure-sensitive adhesive, crimping, heat-sealing, or welding one or both sheets or blanks being recessed to accommodate contents one sheet or blank being recessed and the other formed of relatively stiff flat sheet material, e.g. blister packages, the recess or recesses being preformed

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  • Chemical & Material Sciences (AREA)
  • Composite Materials (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Laminated Bodies (AREA)

Abstract

The present invention is a laminate comprising a substrate, a release layer and a heat-seal layer laminated in this order, wherein the substrate is selected from paper and nonwoven fabric, the release layer is a coating film of a homo-or copolymer of (meth) acrylic acid ester, the particles are contained in an amount of 25 mass% or less relative to the total amount of the coating film, and the heat-seal layer is a coating film of an olefin-alpha, beta-unsaturated carboxylic acid copolymer. According to the present invention, a laminate having both excellent clean peelability and heat seal layer and a package using the laminate can be provided.

Description

Laminate and package using laminate
Technical Field
The present invention relates to a laminate and a package using the laminate.
Background
In a medical field or the like, medical devices such as syringes and surgical gloves used therein are packaged in a sterilized state inside a package. As a sterilization method, after a medical device or the like as an object to be sterilized is enclosed in a package, gas sterilization using Ethylene Oxide Gas (EOG) or the like and irradiation sterilization using gamma rays or the like are performed, and since it is necessary to permeate gas, the package for EOG sterilization is constituted by overlapping nonwoven fabric or paper with a plastic film and heat-sealing between peripheral edges. Such a package for sterilization is required to have gas permeability and easy-to-open property when taking out the sealed article, in addition to the heat sealing strength between the nonwoven fabric or paper and the plastic base material, and conventionally, a resin such as an ethylene-vinyl acetate copolymer has been used as a heat sealing agent (see patent document 1).
Further, as a property required for the medical packaging body, it is important that the peelability is good when taking out the sealed material such as the medical device at the time of use, that is, that the fiber is not peeled off from the paper or nonwoven fabric at the time of unsealing, and that the peeling can be cleanly performed (cleanly peelability). Thus, a method of preventing the fiber from falling off by providing a release layer and a heat seal layer on paper or nonwoven fabric and peeling at the interface between the release layer and the heat seal layer is known (see patent document 2).
Prior art literature
Patent literature
Patent document 1: japanese patent laid-open No. 63-216571
Patent document 2: japanese patent laid-open No. 2000-107268
Disclosure of Invention
Problems to be solved by the invention
However, if the peeling of the fibers during opening is to be prevented, the heat seal strength, which is a fundamental property of the package, is impaired. On the other hand, if the heat seal strength is to be maintained, sufficient clean peelability cannot be obtained. As described above, it is difficult to achieve both of the clean peelability and the heat seal strength because of the relationship therebetween.
For example, there is a method of increasing the thickness of the heat-seal layer in order to prevent the peeling of fibers between the layers of the heat-seal layer while maintaining the adhesion. However, this method is difficult to control the heat seal strength, and requires equipment for applying the heat sealing agent to a large thickness, which makes the production difficult. Further, since the conventional heat sealing agent uses a volatile organic solvent (VOC), the VOC emission increases as the thickness of the heat sealing layer increases, and there are problems such as deterioration of air pollution due to VOC, global warming, and the like. From the viewpoint of sustainability against such an increase in environmental pollution, it is desired to change the solvent to an aqueous solvent in which the organic solvent is replaced with water on a worldwide scale.
On the other hand, the method described in patent document 2 uses an aqueous dispersion containing a pigment in a coating material for a release layer, but since a large amount of pigment is contained in the release layer, the viscosity of a solid component decreases when the dispersion is adjusted to an appropriate viscosity at the time of printing, and there is a problem that coatability decreases or even coating is impossible. In addition, when the peeling layer and the heat seal layer are peeled off at the time of unsealing, there is a possibility that the pigment may be peeled off from the peeling layer.
Thus, it is desired to be able to easily manufacture a package body that combines clean peelability and heat seal strength with a simple apparatus and with reduced environmental load.
Accordingly, an object of the present invention is to provide a laminate which can be produced by a simple facility and is excellent in both clean peelability and heat-seal layer while reducing environmental load, and a package using the laminate.
Means for solving the problems
Specifically, the present invention is a laminate comprising a substrate, a release layer and a heat-seal layer laminated in this order, wherein the substrate is selected from paper and nonwoven fabric, the release layer is a coating film of a homo-or copolymer of a (meth) acrylic acid ester, the particles are contained in an amount of 5 mass% or less relative to the total amount of the coating film, and the heat-seal layer is a coating film of an olefin- α, β -unsaturated carboxylic acid copolymer.
The present invention also provides a package using the laminate.
Effects of the invention
The laminate of the present invention can realize a laminate having both excellent clean peelability and a heat-seal layer by using a configuration in which 2 layers, i.e., a specific peeling layer and a specific heat-seal layer, are provided on a substrate selected from paper and nonwoven fabrics. In addition, the laminate of the present invention can be easily manufactured by a simple apparatus, and the heat seal strength can be easily controlled. In addition, since the release layer and the heat-sealing layer of the present invention can use an aqueous solvent, the environmental load can be reduced by reducing VOC. The package using the laminate of the present invention is particularly suitable for use in medical fields because of its excellent clean peelability and heat seal strength.
Detailed Description
The laminate of the present invention is laminated with a base material selected from paper and nonwoven fabric, a release layer, and a heat seal layer in this order.
In the present invention, (meth) acrylic acid ester means a generic term of acrylic acid ester and methacrylic acid ester, and (meth) acrylic acid means a generic term of acrylic acid and methacrylic acid.
[ Release layer ]
The release layer is provided on a substrate made of paper or nonwoven fabric. In the laminate of the present invention, by providing the release layer between the base material and the heat seal layer, excellent clean peelability can be obtained when unsealing the heat seal portion of the package using the laminate.
The release layer is a coating film of a homo-or copolymer of (meth) acrylate. The coating film of the release layer is formed of a composition (release coating agent) containing at least a homo-or copolymer of (meth) acrylate and an aqueous solvent.
< composition for Forming Release layer (Release coating agent) >)
(homo-or copolymers of methacrylates)
The homo-or copolymer of the (meth) acrylic acid ester is not particularly limited, and examples of the copolymer include a copolymer obtained by copolymerizing a (meth) acrylic acid ester with a copolymerizable vinyl monomer. In addition, a copolymer having an acid value is preferable from the viewpoint of imparting water dispersibility and water solubility.
The (meth) acrylate used as a constituent component of the homo-or copolymer of the (meth) acrylate is not particularly limited, but among them, an acrylate having an alkyl group having 1 to 20 carbon atoms is preferable, and from the viewpoint of exhibiting a lower glass transition temperature, an acrylate having an alkyl group having 1 to 20 carbon atoms is preferable as a main component, and an acrylate having an alkyl group having 1 to 12 carbon atoms is preferable as a main component. Examples of the acrylic acid ester having an alkyl group having 1 to 12 carbon atoms include methyl acrylate, ethyl acrylate, isopropyl acrylate, allyl acrylate, n-butyl acrylate, isobutyl acrylate, sec-butyl (meth) acrylate, t-butyl acrylate, n-pentyl acrylate, isopentyl acrylate, n-hexyl acrylate, n-octyl acrylate, 2-ethylhexyl acrylate, and n-lauryl (meth) acrylate.
Examples of the other (meth) acrylate and the vinyl monomer copolymerizable with the (meth) acrylate include aromatic (meth) acrylates such as benzyl (meth) acrylate; hydroxy-containing monomers such as 2-hydroxyethyl (meth) acrylate and 2-hydroxypropyl (meth) acrylate; alkyl polyalkylene glycol mono (meth) acrylates such as methoxypolyethylene glycol mono (meth) acrylate and methoxypolypropylene glycol mono (meth) acrylate; fluorine-based (meth) acrylates such as perfluoroalkyl ethyl (meth) acrylate; aromatic vinyl compounds such as styrene, styrene derivatives (p-dimethylsilyl styrene, (p-vinylphenyl) methyl sulfide, p-hexynyl styrene, p-methoxystyrene, p-t-butyldimethylsilyloxy styrene, o-methylstyrene, p-t-butylstyrene, and α -methylstyrene), vinyl naphthalene, vinyl anthracene, and 1, 1-diphenylethylene; glycidyl (meth) acrylate, epoxy (meth) acrylate, ethylene glycol di (meth) acrylate, diethylene glycol di (meth) acrylate, trimethylolpropane tri (meth) acrylate, 1, 4-butanediol tetra (meth) acrylate, 2-hydroxy-1, 3-diacryloyloxypropane, 2-bis [4- (acryloyloxymethoxy) phenyl ] propane, 2-bis [4- (acryloyloxyethoxy) phenyl ] propane, dicyclopentadiene (meth) acrylate, tricyclodecyl (meth) acrylate, tris (acryloyloxyethyl) isocyanurate, urethane (meth) acrylate, and the like; (meth) acrylic esters having an alkylamino group such as dimethylaminoethyl (meth) acrylate, diethylaminoethyl (meth) acrylate, dimethylaminopropyl (meth) acrylate and the like; vinyl pyridine compounds such as 2-vinyl pyridine, 4-vinyl pyridine and naphthylvinyl pyridine; conjugated dienes such as 1, 3-butadiene, 2-methyl-1, 3-butadiene, 2, 3-dimethyl-1, 3-butadiene, 1, 3-pentadiene, 1, 3-hexadiene, and 1, 3-cyclohexadiene. These monomers may be used in an amount of 1 or 2 or more.
Further, for the purpose of introducing at least 1 acid group selected from the group consisting of a carboxyl group and a carboxylate group obtained by neutralizing the carboxyl group with a basic compound, (meth) acrylic acid, crotonic acid, itaconic acid, maleic acid, fumaric acid, β - (meth) acryloyloxyethyl hydrogen succinate, β - (meth) acryloyloxyethyl hydrogen phthalate and other (meth) acrylic monomers having a carboxyl group are copolymerized, whereby a copolymer having an acid value can be obtained.
When an acidic group is introduced, the amount of the monomer is preferably appropriately adjusted so that the acid value is within a desired range.
The homo-or copolymer of (meth) acrylic acid ester can be produced, for example, by polymerizing 1 or 2 or more monomers in the presence of a polymerization initiator at a temperature ranging from 50℃to 180℃and more preferably at a temperature ranging from 80℃to 150 ℃. Examples of the polymerization method include bulk polymerization, solution polymerization, suspension polymerization, and emulsion polymerization. Examples of the polymerization form include random copolymers, block copolymers, and graft copolymers. The copolymer may be of a core-shell type.
(microparticles)
The release layer preferably contains no microparticles, but may also contain microparticles. When the fine particles are contained, the content of the fine particles is 25 mass% or less relative to the release layer. By setting the proportion of fine particles in the release layer to 25 mass% or less, the coatability at the time of printing is improved. Therefore, the release layer can be easily adjusted to a desired film thickness. In addition, excellent clean peelability can be obtained, and in addition, heat seal strength can be improved. In addition, the particles can be prevented from sliding down during peeling. The proportion of the fine particles in the release layer may be 25% by mass or less, preferably 20% by mass or less, preferably 15% by mass or less, preferably 10% by mass or less, more preferably 5% by mass or less, more preferably 3% by mass or less, preferably 1% by mass or less, more preferably 0.5% by mass or less, more preferably 0.1% by mass or less. The release layer preferably contains no fine particles, that is, preferably 0% or less.
In the composition (release coating agent) for forming the release layer, the content of the fine particles may be adjusted so that the content of the fine particles is 25 mass% or less with respect to the total amount of the finally formed coating film, and for example, 10 mass% or less, preferably 5 mass% or less, preferably 3 mass% or less, preferably 1 mass% or less, preferably 0.5 mass% or less, preferably 0.1 mass% or less, and preferably 0 mass% or less with respect to the total amount of the composition.
The type of the fine particles is not particularly limited, and any of organic fine particles, inorganic fine particles, and organic-inorganic composite fine particles may be used.
Examples of the organic fine particles include various resin beads such as polyolefin-based resins, (meth) acrylate-based resins, polystyrene resins, melamine resins, amide-based resins, and urethane-based resins. Examples of the inorganic fine particles include carbon black, titanium oxide, zinc sulfide, barium sulfate, calcium carbonate, chromium oxide, silica, iron oxide red, aluminum hydroxide, mica (mica), clay, talc, and kaolin. Among them, inorganic fine particles such as clay, talc and kaolin are preferable. Examples of the organic-inorganic composite particles include acrylic-silicone particles and silicone particles. The type of the fine particles may be 1, or a plurality of kinds may be used.
The particle diameter of the fine particles is not particularly limited, but from the viewpoint of dispersibility, the average particle diameter (D50) is preferably 40 μm or less, more preferably 30 μm or less.
In order to uniformly disperse the fine particles, it is preferable to grind (Japanese: meat) using a medium or to mix the fine particles after producing a wax-made dispersion. The polishing method can be carried out by a known method.
(aqueous solvent)
As the release coating agent, water, a water-soluble organic solvent dissolved in water, or the like can be used. As the water, pure water such as ion-exchanged water, ultrafiltration water, reverse osmosis water, distilled water, or ultrapure water may be used. In addition, in the case of storing the composition for a long period of time, water sterilized by ultraviolet irradiation, hydrogen peroxide addition, or the like is suitably used as the water in order to prevent the generation of mold or bacteria.
Examples of the water-soluble organic solvent include glycols such as ethylene glycol, diethylene glycol, triethylene glycol, tetraethylene glycol, propylene glycol, polyethylene glycol, and polypropylene glycol; diols such as butanediol, pentanediol, and hexanediol; glycol esters such as propylene glycol laurate; diethylene glycol ethers such as diethylene glycol monoethyl ether, diethylene glycol monobutyl ether, diethylene glycol monohexyl ether, and carbitol; glycol ethers such as cellosolve including propylene glycol ether, dipropylene glycol ether and triethylene glycol ether; alcohols such as methanol, ethanol, isopropanol, 1-propanol, 2-propanol, 1-butanol, 2-butanol, and pentanol; and various other solvents known as aqueous organic solvents, such as lactones, e.g., sulfolane, ester, ketone, and γ -butyrolactone, lactams, e.g., N- (2-hydroxyethyl) pyrrolidone, glycerin, and polyalkylene oxide adducts thereof. These aqueous organic solvents may be used singly or in combination of 2 or more. Of these, water is most preferred.
(other additives)
The release coating agent may contain additives such as wax, defoamer, leveling agent, thickener, preservative, antibacterial agent, and rust inhibitor in addition to the above components in a range that does not hinder the object of the present invention. Further, other resins than homopolymers or copolymers of (meth) acrylic acid esters may be blended.
The type of leveling agent is not particularly limited, but an alkyne-based surfactant is preferably used. Specific examples of the alkyne-based surfactant include 2, 5-dimethyl-3-hexyne-2, 5-diol, 3, 6-dimethyl-4-octyne-3, 6-diol, 2,4,7, 9-tetramethyl-5-decyne-4, 7-diol, 3, 5-dimethyl-1-hexyne-3-ol, 3-methyl-1-butyne-3-ol, 3-methyl-1-pentyne-3-ol, 3-hexyne-2, 5-diol, and 2-butyne-1, 4-diol. Examples of the commercial Products include non-alkylene oxide-modified acetylenic diol surfactants such as Surfynol 61, 82 and 104 (all manufactured by Air Products Co., ltd.), surfynol 420, 440, 465, 485, TG, 2502, dynol 604 and 607 (all manufactured by Air Products Co., ltd.), surfynol SE, MD-20, OLFINE (Japanese: chalcon) E1004, E1010, PD-004, EXP4300, PD-501, PD-502 and SPC (all manufactured by Japanese chemical industries Co., ltd.), and alkylene oxide-modified acetylenic diol surfactants such as Acetylenol EH, E40, E60, E81, E100 and E200 (all manufactured by Sichuan fine chemical Co., ltd.).
The amount of the leveling agent to be added is preferably 0.01 to 0.1% by mass based on the total amount of the composition for forming the release layer.
In order to prevent foaming of the composition when the release coating agent is applied to paper, the release layer of the present invention preferably contains a polymer-based antifoaming agent, a silicon-based antifoaming agent, and a fluorine-based antifoaming agent. As these antifoaming agents, any of emulsion dispersion type, solubilizing type, and the like can be used. Among them, polymer-based antifoaming agents are preferable. The amount of the defoaming agent added is preferably 0.005 to 0.1% by weight based on the total amount of the release coating agent.
< method for Forming Release layer >
The release layer of the present invention is preferably formed using a release coating agent containing a (meth) acrylate homopolymer or copolymer and an aqueous solvent, and optionally containing fine particles and other additives. The release layer may be provided by, for example, using paper or nonwoven fabric as a substrate and coating the substrate with the release layer.
As a method for applying the release coating agent to the substrate, a known method can be used. For example, any one or a combination of two or more of a comma type knife coater, a roll coater, a reverse roll coater, a direct slot roll coater, a reverse slot roll coater, a compensating slot roll coater, a roll licking coater, a contact reverse roll coater, a contact slot roll coater, a contact reverse slot roll coater, an air knife coater, a bar coater, a wire bar coater, a die coater, a lip coater, a dip coater, a blade coater, a brush coater, a curtain coater, a slot coater, an offset printer, a screen printer, and the like may be used.
In addition, the release layer may be provided on the substrate by immersing the substrate in the release coating agent. In the case of dipping, a separate dipping machine is required, but in the case of coating, the coating method is more preferable because the dipping machine can be easily manufactured by printing using a general-purpose printer as described above. In addition, in the case of dipping, it is difficult to control the thickness (amount) of the release layer, and in addition, the drying step takes a longer time than in the case of coating, and there are cases where deformation such as bending of the substrate occurs due to drying, so that coating is preferable.
In addition, a drying step of drying in an oven or the like may be provided after the application.
The amount of the release layer at the time of coating is preferably, for example, 1.0 to 8.0g/m 2 Is not limited in terms of the range of (a). When the amount is within this range, the effects of the present invention can be sufficiently obtained. Of these, more preferably 2 to 6g/m 2 Is not limited in terms of the range of (a).
[ Heat seal layer ]
In the laminate, a heat seal layer is provided on the release layer. The heat-seal layer of the present invention forms a package by bonding an adherend to a laminate by a heat-seal function.
The heat-sealing layer is a coating film of an olefin-alpha, beta unsaturated carboxylic acid copolymer. The coating film of the heat-seal layer is formed using a composition (coating agent) containing at least an olefin- α, β -unsaturated carboxylic acid copolymer and an aqueous solvent.
< composition for Forming Heat seal layer (Water-based Heat sealing agent) >)
(olefin-alpha, beta unsaturated carboxylic acid copolymer)
Examples of the olefin- α, β -unsaturated carboxylic acid copolymer used in the heat-sealing layer include copolymers of an olefin and at least 1 monomer selected from the group consisting of α, β -unsaturated carboxylic acids, metal salts of α, β -unsaturated carboxylic acids, and esters of α, β -unsaturated carboxylic acids. Specifically, examples of the copolymer of α, β -unsaturated carboxylic acid, a metal salt of α, β -unsaturated carboxylic acid, or α, β -unsaturated carboxylic acid ester and olefin include olefin- α, β -unsaturated carboxylic acid copolymer, ethylene-acrylic acid ester copolymer, ethylene-methacrylic acid ester copolymer, ethylene-acrylic acid-maleic anhydride copolymer, ethylene-acrylic acid ester-maleic anhydride copolymer, ethylene-methacrylic acid ester-maleic anhydride copolymer, and metal salts thereof. These copolymers may be 1 kind alone or a mixture of 2 or more kinds.
Among them, olefin- α, β unsaturated carboxylic acid copolymers are preferable. Examples of the olefin- α, β -unsaturated carboxylic acid copolymer include random copolymers or block copolymers of ethylene and α, β -unsaturated carboxylic acid.
Examples of the olefin include ethylene, propylene, 1-butene, 1-pentene, 1-hexene, 1-octene, 1-decene, 4-methyl-1-pentene, butadiene, dicyclopentadiene, and 5-ethylidene-2-norbornene. Among them, ethylene is preferable.
Examples of the α, β -unsaturated carboxylic acid include acrylic acid, methacrylic acid, crotonic acid, maleic acid, fumaric acid, itaconic acid, and the like. Among them, acrylic acid and methacrylic acid can be suitably used. These α, β -unsaturated carboxylic acids may be used singly or in combination of 2 or more.
The α, β -unsaturated carboxylic acid esters are not particularly limited, and known alkyl esters, hydroxyalkyl esters, alkoxyalkyl esters, and the like of acrylic acid or methacrylic acid can be used. Specific examples thereof include acrylic esters such as methyl acrylate, ethyl acrylate, isopropyl acrylate, n-propyl acrylate, n-butyl acrylate, isobutyl acrylate, 2-ethylhexyl acrylate, isooctyl acrylate, n-octyl acrylate, 2-hydroxyethyl acrylate, 2-methoxyethyl acrylate, methyl methacrylate, ethyl methacrylate, isopropyl methacrylate, n-propyl methacrylate, n-butyl methacrylate, isobutyl methacrylate, n-hexyl methacrylate, 2-ethylhexyl methacrylate, n-lauryl methacrylate, 2-hydroxyethyl methacrylate, and 2-ethoxyethyl methacrylate. They may be used in 1 kind or in combination of more than 2 kinds.
The olefin- α, β unsaturated carboxylic acid copolymer can be produced by a known method, for example, radical copolymerization at high temperature and high pressure.
The content of the α, β -unsaturated carboxylic acid in the above-mentioned olefin- α, β -unsaturated carboxylic acid copolymer is desirably 8 to 24% by weight, preferably 18 to 23% by weight. In the case where the content of α, β -unsaturated carboxylic acid is less than 8% by weight, the dispersibility to an aqueous dispersion medium is poor due to the nonpolar nature derived from ethylene units, and it may be difficult to obtain an excellent aqueous dispersion of the olefin- α, β -unsaturated carboxylic acid copolymer resin. In addition, when the content of α, β -unsaturated carboxylic acid is more than 24% by weight, the blocking resistance of the obtained film may be deteriorated.
The olefin- α, β unsaturated carboxylic acid copolymer used in the heat sealing agent is used in the form of an aqueous dispersion dispersed in an aqueous solvent. The method of dispersing in the aqueous solvent is not particularly limited, and may be carried out by a known method. Examples of the method include a method of dispersing an olefin- α, β unsaturated carboxylic acid copolymer in an aqueous solvent by emulsifying the copolymer with a surfactant, and a method of neutralizing the copolymer with a basic compound and dispersing the neutralized copolymer in an aqueous solvent.
The surfactant used in the emulsification may be any of various known anionic, cationic, nonionic surfactants, and various water-soluble polymers.
Examples of the basic compound used in the neutralization include organic amines such as ammonia, methylamine, ethylamine, diethylamine, dimethylethanolamine, diethanolamine, and triethanolamine, and alkali metal hydroxides such as sodium hydroxide, potassium hydroxide, and lithium hydroxide. These basic compounds may be used alone or in combination of 2 or more.
The degree of neutralization by the basic compound may be any degree as long as the olefin- α, β -unsaturated carboxylic acid copolymer is stably present in the aqueous solvent. For example, the carboxyl group of the copolymer may be 30 to 100 mol%, and more preferably 40 to 90 mol%.
As the dispersion method, a known method can be used, for example, as a dispersion device using a medium, a paint stirrer, a ball mill, an attritor, a basket mill, a sand mill (sand mill), a DYNO-MILL, DISPERMAT, SC mill, a nail crusher, a stirring mill, or the like can be used, and as a dispersion device not using a medium, dispersion can be performed using an ultrasonic homogenizer, a high-pressure homogenizer, a nano mill (nanomizer), a dissolver (distolver), a disperser, a high-speed impeller disperser, or the like.
The solid content of the aqueous dispersion of the olefin- α, β unsaturated carboxylic acid copolymer used in the present invention is not particularly limited, as long as it is appropriately determined according to the desired viscosity when applied as a heat sealing agent, the drying condition after application of the heat sealing agent, the film thickness of the coating film, and the like. Generally, the solid content concentration is often used in the range of 10 to 40 mass%.
(aqueous solvent)
As the aqueous solvent, the same aqueous solvent as that used in the composition used in the release layer described above can be used.
(wax)
The heat-sealing agent preferably contains wax. By containing wax, blocking resistance can be ensured. Examples of the wax (W1) include fatty acid amide waxes, carnauba waxes (carnauba wax), polyolefin waxes, paraffin waxes, fischer-tropsch waxes, beeswax, microcrystalline waxes, oxidized polyethylene waxes, amide waxes and other waxes, coconut oil fatty acids, soybean oil fatty acids and the like. They may be used alone or in combination.
Among these, polyolefin wax, fatty acid amide wax, carnauba wax, and Fischer-Tropsch wax are preferably used, and polyolefin wax, fatty acid amide wax, and carnauba wax are particularly preferably used.
Specific examples of the fatty acid amide wax include pelargonic acid amide, capric acid amide, undecanoic acid amide, lauric acid amide, tridecanoic acid amide, myristic acid amide, pentadecanoic acid amide, palmitic acid amide, margaric acid amide, stearic acid amide, nonadecanoic acid amide, arachic acid amide, behenic acid amide, lignoceric acid amide, oleic acid amide, behenic acid amide, linoleic acid amide, linolenic acid amide, and mixtures thereof, and animal and vegetable fat fatty acid amide.
Specific examples of the carnauba wax include MICROKLEAR 418 (manufactured by MicroPowrers, inc.), refined carnauba wax No. 1 powder (manufactured by Japan wax Co., ltd.), and the like.
Examples of the polyolefin wax include polyethylene wax and polypropylene wax.
The amount of the wax to be blended is preferably 1.5 to 25% by mass based on 100% by mass of the solid content of the heat-sealing agent. When the total amount of the wax is 1.5 mass% or more relative to 100% of the total solid content of the heat-sealing agent, the blocking resistance tends to be maintained, and when the total amount of the wax (W1) is 25 mass% or less relative to 100% of the total solid content of the heat-sealing agent, the heat-sealing property tends to be maintained.
The amount of the wax to be added is preferably 1 to 5% by mass based on the total amount of the heat-seal layer-forming composition.
Among the waxes, the use of the fatty acid amide wax and the carnauba wax in combination is more preferable because the blocking resistance is further improved. In the case of the combination, the ratio is not particularly limited, but the fatty acid amide wax is preferably in the range of 1:1 to 1:10, more preferably in the range of 1:1 to 1:5.
The wax may be directly added to the aqueous dispersion of the olefin- α, β unsaturated carboxylic acid copolymer and mixed and dispersed, or may be simultaneously added to the aqueous solvent and mixed and dispersed when the olefin- α, β unsaturated carboxylic acid copolymer is dispersed in the aqueous solvent. The dispersion method can be suitably applied to the method used in the above-mentioned method for dispersing the olefin- α, β -unsaturated carboxylic acid copolymer in an aqueous solvent.
When a plurality of waxes are used in combination, the plurality of waxes may be added simultaneously or may be added in a plurality of steps. For example, a heat-sealing agent containing a wax can be obtained by adding a first wax to disperse the above-mentioned olefin- α, β unsaturated carboxylic acid copolymer in an aqueous solvent, and then adding a second wax to the aqueous dispersion of the obtained first wax and the above-mentioned olefin- α, β unsaturated carboxylic acid copolymer. The amount and type of the leveling agent may be the same as those used in the release coating agent.
(leveling agent)
The heat-sealing agent preferably contains a leveling agent. By containing the leveling agent, pinholes in the coating film can be prevented from occurring. The type of the leveling agent is not particularly limited, and the same leveling agent as exemplified as the leveling agent that can be used for the release layer described above can be used. The amount of the leveling agent to be added is preferably 0.01 to 0.1% by weight based on the total amount of the composition for forming the release layer.
The heat sealing agent may contain additives such as silica, alumina, an antifoaming agent, a viscosity adjuster, a thickener, a preservative, an antibacterial agent, an antirust agent, an antioxidant, and silicone oil in addition to the above components in a range that does not hinder the object of the present invention.
In addition, in the heat sealing agent, in order to prevent foaming when coating using various coating machines, a polymer-based antifoaming agent, a silicon-based antifoaming agent, and a fluorine-based antifoaming agent are preferably used. As these antifoaming agents, any of emulsion dispersion type, solubilizing type, and the like can be used. Among them, polymer-based antifoaming agents are preferable. The amount of the defoaming agent is preferably 0.005 to 0.1% by weight based on the total amount of the aqueous heat sealing agent.
< method of Forming Heat seal layer >
The heat-sealing layer is provided by using the heat-sealing agent described above, for example, by coating on the release layer. As a coating method in the case of coating, a known method can be used. For example, roll coaters, slot roll coaters, flexographic coaters, air knife coaters, blade coaters, air knife coaters, extrusion coaters, dip coaters, transfer roll coaters, kiss coaters, curtain coaters, cast coaters, spray coaters, curtain coaters, offset printers, screen printers, and the like can be used. In addition, a drying step of drying in an oven or the like may be provided after the application.
The amount of the heat-sealing layer to be applied is preferably, for example, 1.0 to 8.0g/m 2 Is not limited in terms of the range of (a). An amount in the heat seal layer of less than 1.0g/m 2 Is the case of (1)The heat seal strength is liable to be deteriorated. On the other hand, the amount in the heat-sealing layer is more than 5.0g/m 2 In the case of (a), when the heat-sealed portion serving as the bonded portion is peeled off, a part of the paper or nonwoven fabric substrate is easily peeled off, and cleanly peelability is impaired. Of these, more preferably 1.5 to 6g/m 2 In the range of 3 to 5g/m 2 Is not limited in terms of the range of (a). By adjusting the amount of the heat-seal layer, it is possible to easily adjust the heat-seal strength to a desired heat-seal strength.
The heat-sealing agent has a function as an adhesive by applying an aqueous heat-sealing agent to a substrate and bonding the substrate and an adherend in a state of being overlapped with each other via the heat-sealing agent. Specifically, the heat sealing agent is applied to the release layer provided on the substrate, and then softened by heating. The heat sealing agent can be easily softened by heating with a burner or hot air, and the base material and the adherend can be bonded together, and thereafter, the bonded portion can be solidified by cooling, so that the base material and the adherend can be firmly sealed.
As the heating method, a conventionally known method such as a heat source such as a burner, hot air, electric heat, infrared light, or electron beam can be used, and specifically, a method of heating by a burner or hot air, a thermal welding sealing method selected according to a molding form, an ultrasonic sealing method, or a high-frequency sealing method is preferable. The heating temperature in this case is preferably 120 to 500℃and the heating time is preferably 0.1 to 3 seconds. The heat-seal layer of the present invention can obtain a heat-seal strength of 4N/15mm or more sufficient for use as a medical packaging material even at a relatively low temperature of 120 ℃ or more. In addition, since heat sealing can be performed in a large temperature range, the heat sealing strength can be easily adjusted and manufacturing can be easily performed. The heat sealing is preferably performed in the range of 120 to 200 ℃, more preferably in the range of 130 to 180 ℃, from the viewpoints of heat sealing strength and ease of manufacture.
In addition, in addition to the method of melting the heat-sealing agent by contact with a direct heat source such as a heat-sealing bar, the heat-sealing agent is easily softened by heating without contact, and the heat-sealing function is continued for a certain period of time even when the heat source is removed. In the case where the base material is paper, the paper may be burned when in contact with a direct heat source, but the heat sealing agent of the present invention is particularly useful as a heat sealing agent for industrial production of paper containers requiring a high line speed because the heat sealing function is exhibited by non-contact heating and the function is continued.
The heat-sealing agent can be used as a heat-sealing agent by applying the heat-sealing agent and heat-softening the applied portion, and then pressing the applied portion against the adherend in a superimposed state. The pressure bonding method is not particularly limited, and may be performed by a hot plate method, ultrasonic sealing, or high-frequency sealing.
[ substrate ]
The base paper of the present invention is selected from paper or nonwoven fabric.
The paper base material is made of natural fibers for paper making such as wood pulp, and paper sheets are not particularly limited by using a known paper machine. Examples of the natural fibers for paper production include wood pulp such as conifer pulp and hardwood pulp, non-wood pulp such as abaca pulp, sisal pulp and flax pulp, and pulp obtained by chemically modifying these pulps. As the kind of pulp, chemical pulp, grinding pulp, chemical grinding pulp, thermal mechanical pulp, and the like based on sulfate hydrolysis, acid/neutral/alkaline sulfite hydrolysis, sodium salt hydrolysis, and the like can be used. In addition, various commercially available advanced papers, coated papers, interleaving papers, impregnated papers, corrugated papers, cardboard papers, and the like may be used.
As the nonwoven fabric, a nonwoven fabric obtained by thermally fusing fibers of a thermoplastic resin such as a fibrous polyolefin can be used.
The base material may be selected from the types, thicknesses, and the like of papers and nonwoven fabrics in order according to the purpose. For example, in the case where it is necessary to sterilize a medical packaging material with gas, the packaging material may be appropriately selected from the viewpoint of proper gas permeability and strength as a base material, and specifically, 30 to 300g/m is preferable in terms of square meter gram weight 2 Preferably 40 to 200g/m 2 Preferably 50 to 100g/m 2 . On the other hand, in the case of using the laminate of the present invention as a container such as paper cup, paper tray, paper packaging material, etc., the laminate is squareThe weight of the rice is preferably 200-350 g/m 2 More preferably 200 to 300g/m 2 。
The base material of the paper or nonwoven fabric may have a printed layer.
[ packaging body ]
The laminate of the present invention can be processed into boxes, bags, and containers by heat-sealing using heat-sealable coating portions.
Examples of the package include a bag for packaging, a paper bag, a cardboard box, corrugated paper, wrapping paper, an envelope, a sleeve, and a lid. Examples of the container include a paper container, a paper tray, a cup holder, and a paper cup. The water-resistant paper of the present invention can be used for foods, sundries, living goods, etc. which require water resistance and moisture resistance. Examples thereof include cups and caps for desserts such as cupboards, ice creams, puddings and jellies, snack bags and boxes, hamburgers, hot dog wrappers, packaging containers for pizza and the like, containers for hot snack foods such as dry fried foods and potatoes, paper containers for food such as cups and the like for food such as parafood such as natto, and bags and boxes for sanitary products such as detergents and sanitary products. The release layer and the heat seal layer may be provided on the inner side surface of the packaging material or the container, or may be provided on the outer side surface, or may be provided on both sides of the base material, depending on the application.
When a paper cup is produced using the laminate of the present invention, the paper cup can be produced by providing a heat-seal layer on the inner surface of the container and the bonding surface at the time of assembling the container, and bonding the heat-seal layer. That is, the paper cup has a main body member (1) and a plate-shaped bottom member (2), and at least a heat seal layer is provided in an adhesion portion, wherein the main body member (1) is obtained by adhering adhesion surfaces of both end portions of a wound paper base material to each other using the laminate of the present invention, and the plate-shaped bottom member (2) is adhered to a lower end of the main body member (1). The heat seal layer may be provided only in the adhesive portion or may be provided in the entire paper base material.
Similarly, cartons, paper bags, and the like can be produced using the laminate of the present invention with the heat seal layer as the adhesive portion.
The laminate of the present invention can be used preferably as an easily openable package, and is preferably used as a medical packaging material for packaging a medical sterilizer, because it can achieve both excellent heat sealability and clean peelability.
In the case of using the above-described package, the package may be formed into a bag, a box, or a packaging paper by sealing the heat-sealable coating portion by using the laminate alone, or may be formed by bonding the laminate and the adherend via a heat-seal layer after the laminate is overlapped.
When used as a medical packaging material, it is preferable to heat-seal the laminate at the peripheral edge portion by overlapping the laminate with an adherend such as a plastic film. The release layer and the heat seal layer may be provided at least in the heat seal portion of the base material. Therefore, the release layer and the heat seal layer may be provided only locally at the heat-sealed portion, or may be provided over the entire surface of at least one surface of the base material.
In the package, when the laminate is heat-sealed with the adherend, the adherend is not particularly limited, and various substrates such as paper, nonwoven fabric, and plastic film can be used. The material of the plastic film is not particularly limited. Typical plastic film substrates include films containing polyamide resins such as nylon 6, nylon 66, and nylon 46, thermoplastic resins such as polyethylene terephthalate (hereinafter sometimes referred to as PET), polyethylene naphthalate, polypropylene terephthalate, polypropylene naphthalate, polyester resins such as polybutylene terephthalate and polybutylene naphthalate, biodegradable resins such as polyhydroxycarboxylic acid such as polylactic acid, aliphatic polyester resins such as poly (ethylene succinate) and poly (butylene succinate), polyolefin resins such as polypropylene and polyethylene, polyimide resins, polyarylate resins, or mixtures thereof, and laminates thereof, and films containing PET, polyester, polyamide, polyethylene, and polypropylene can be suitably used. These base films may be unstretched films or stretched films, and the production method thereof is not limited. The thickness of the base film is not particularly limited, and is usually in the range of 1 to 500. Mu.m. In addition, the surface may be corona treated.
The heat seal strength of the package of the present invention is preferably in the range of 4N/15mm to 10N/1.5 mm. When the heat seal strength is within the above range, the heat seal strength and the easy-to-open property can be sufficiently achieved.
The package of the present invention is unsealed by peeling the heat-sealed portion at the time of unsealing. In this case, the interface between the release layer and the heat seal layer or interlayer peeling in the release layer occurs to open the package, so that peeling of the paper or nonwoven fabric can be prevented. Further, since the release layer does not contain fine particles, even if the release layer contains fine particles in an amount of 25 mass% or less, the release layer can be ensured in coating property and the release layer can be prevented from being detached from the release layer, and further excellent clean release property can be obtained.
The present invention will be described in detail with reference to examples, but the technical scope of the present invention is not limited to these embodiments.
Examples
In the following examples, "parts" means "parts by mass" and "%" means "% by mass".
< method for producing olefin-alpha, beta unsaturated carboxylic acid copolymer >
Production example 1
77.8 parts of ethylene, 11.1 parts of ethyl acrylate and 11.2 parts of acrylic acid are synthesized by a conventional method to obtain an ethylene-ethyl acrylate-acrylic acid copolymer.
25 parts of the obtained copolymer, ammonia having a neutralization rate of 100% relative to the acid value of the copolymer, and water as an aqueous solvent were added and stirred to obtain an aqueous dispersion (A1) of an olefin- α, β -unsaturated carboxylic acid copolymer.
Production example 2
77.8 parts of ethylene, 11.1 parts of ethyl acrylate and 11.2 parts of acrylic acid are synthesized by a conventional method to obtain an ethylene-ethyl acrylate-acrylic acid copolymer.
25 parts of the copolymer obtained, ammonia having a neutralization rate of 100% relative to the acid value of the copolymer, water as an aqueous solvent, and 1.5 parts of a fatty acid amide wax as a wax were added and stirred to obtain an aqueous dispersion (A2) of an olefin- α, β -unsaturated carboxylic acid copolymer and a fatty acid amide wax.
< preparation of Heat sealing agent >
Examples 1 to 12 and comparative examples 1 to 4
Using the aqueous dispersion (A1) or (A2) obtained in production example 1 or production example 2, heat-sealing agents of examples or comparative examples were obtained in accordance with the compositions of Table 1 or 2.
The polyethylene wax was used as the wax 1 in the table.
In addition, ethylene glycol-based surfactant was used as the leveling agent in the table.
In comparative example 1, a commercially available aqueous acrylic emulsion was used as the aqueous acrylic heat sealing agent.
In comparative example 2, a coating liquid obtained by dispersing 100 parts by mass of an ethylene-vinyl acetate copolymer in 10 parts by mass of ion-exchanged water was used as the aqueous EVA heat sealing agent.
In comparative example 3, a coating liquid obtained by dissolving 20 parts by mass of an ethylene-vinyl acetate copolymer in 75 parts by mass of toluene and 5 parts by mass of isopropyl alcohol was used as a solvent-based EVA heat sealing agent.
< preparation of Release agent >
Examples 1 to 12 and comparative example 4
An aqueous acrylic emulsion (chemipearil (registered trademark) manufactured by mitsunobu chemical company) was used as a homopolymer or copolymer of the (meth) acrylic ester.
As clay in the table, kaolin clay (ASP-170 (BASF corporation)) was used.
In table 1, the blending ratio of the acrylic resin emulsion used in the stripper composition and the aqueous dispersions (A1) and (A2) used in the heat sealing agent composition indicates the ratio of the resin solid components.
< preparation of laminate >
Examples 1 to 12 and comparative examples 1 to 4
The release coating agent of the example or comparative example was applied to a nonwoven fabric (Asahi-Dupont Flash Spun Products Co., ltd., high-density polyethylene nonwoven fabric (trade name: tyvek 1073B, gram weight per unit area 75 g/m) using a bar coater #16 2 ) Thereafter, the resultant mixture was dried at 150℃for 20 seconds to form a release layer. Next to this, the process is carried out,the heat-sealing agent of example or comparative example was applied to the release layer using a bar coater #16, and then dried at 150℃for 20 seconds, to prepare laminates of examples 1 to 12 and comparative example 4, respectively.
In comparative examples 1 to 3, the heat-sealing agents of comparative examples 1 to 3 were applied to the nonwoven fabric used in example 1 by using a bar coater #16, and then dried at 150℃for 20 seconds, whereby laminates of comparative examples 1 to 3 were produced, respectively.
The coating amounts of the release coating layer and the heat-seal layer were set to the respective coating amounts shown in tables 1 and 2.
< evaluation >
(Heat seal Strength)
The laminate of examples 1 to 12 and comparative examples 1 to 4 was cut to 3.0cm×5.0cm, the coated surface of the laminate and a polyethylene/polyester laminate film (thickness 60 μm) as an adherend were overlapped so that the polyethylene side surface of the film faced the heat seal layer, and after heating at each temperature of 130 to 170 ℃ shown in the table, heat sealing was performed immediately using a heat sealer under a pressure of 0.3MPa and a sealing condition of 1.5 seconds, thereby providing a heat seal portion.
The laminate provided with the heat-sealed portion was cut out to a width of 15mm, and the peel strength was measured when peeled off rapidly under conditions of a stretching speed of 200 mm/min and 180 degrees peeling. The determination criteria are as follows.
(evaluation)
5: the sealing strength is more than 6N/15mm;
4: the sealing strength is more than 5N/15mm and less than 6N/15mm;
3: the sealing strength is more than 4N/15mm and less than 5N/15mm;
2: the sealing strength is more than 3N/15mm and less than 4N/15mm;
1: the sealing strength is less than 3N/15mm.
(clean peelability)
In the evaluation of the heat sealability, the surface state of the heat sealed portion after rapid peeling under the conditions of a stretching speed of 200 mm/min and 180 degree peeling was evaluated according to the peeling and breaking occurrence condition of the nonwoven fabric.
(evaluation)
O: the coating layer (release coating agent) remained on the nonwoven fabric (interlayer peeling of the coating layer), and peeling and breakage of the nonwoven fabric did not occur.
Delta: there is a portion where a part of the coating layer (release coating agent) is peeled off, and peeling and breaking of the nonwoven fabric occur.
X: the coating layer (release coating agent) was peeled at 30% or more, and the nonwoven fabric was peeled and broken in a wide range.
(blocking resistance)
The coated surfaces of the laminates of examples 1 to 12 and comparative examples 1 to 4 were overlapped with each other and applied with 10kgf/cm so as to be in contact with the non-coated surface (the surface opposite to the coated surface) 2 After 48 hours at 40 ℃, the coated surface and the non-coated surface were visually evaluated for adhesion according to the following 4 grades.
(evaluation)
And (3) the following materials: no blocking was observed at all.
O: slight blocking was observed in part.
Delta: blocking was partially observed.
X: blocking was observed across the entire face.
TABLE 1
/>
TABLE 2
TABLE 3
According to examples 1 to 12, the laminate of the present invention having a release layer and a heat-seal layer can achieve both heat sealability and clean releasability at the same level as the solvent-based EVA heat-sealing agent used in comparative example 3. Examples 1 to 12 use an aqueous solvent, so that environmental load can be reduced, and also, since the heat seal layer does not need to be applied thickly, the heat seal layer can be produced by a simple apparatus. Further, the blocking property can be improved as compared with comparative example 3.
In addition, comparative example 1 using the aqueous acrylic heat sealing agent gave a result of poor heat sealability at 130 to 170 ℃, however, the laminate of the present invention was excellent in heat sealability at a relatively low temperature of 130 to 170 ℃ and was able to exhibit excellent heat sealability in a wide temperature range.
In comparative example 4, in which 15 mass% of clay was contained in the stripping agent-forming composition, the viscosity of the solid content was lowered when the viscosity was adjusted to the adaptive viscosity at the time of printing, and coating was not performed.

Claims (9)

1. A laminate comprising a substrate, a release layer and a heat seal layer laminated in this order,
The substrate is selected from the group consisting of paper and nonwoven,
the release layer is a coating film of a homo-or copolymer of a (meth) acrylic acid ester, contains fine particles in a proportion of 25 mass% or less relative to the total amount of the coating film,
the heat sealing layer is a coating film of an olefin-alpha, beta unsaturated carboxylic acid copolymer.
2. The laminate according to claim 1, wherein,
the heat seal layer contains wax and/or a leveling agent.
3. The laminate according to claim 1 or 2, wherein,
the amount of the heat-seal layer was 1.0g/m 2 ～8.0g/m 2 。
4. The laminate according to any one of claim 1 to 3, wherein,
the amount of the peeling layer was 1.0g/m 2 ～8.0g/m 2 。
5. The laminate according to any one of claims 1 to 4, wherein,
the laminated body is sterilized paper or sterilized non-woven fabric.
6. A package obtained by bonding the laminate according to any one of claims 1 to 5 to an adherend via a heat seal layer provided on the laminate.
7. The package according to claim 6, wherein,
the heat-seal layer is provided at a peripheral edge portion of the laminate, and heat-seals the adherend at the peripheral edge portion.
8. The package according to claim 6 or 7, wherein,
the adherend is a plastic film.
9. The package according to any one of claims 6 to 8, wherein,
the adhesive strength between the laminate and the adherend is in the range of 4N/15mm to 10N/1.5 mm.
CN202280010427.2A 2021-03-04 2022-02-17 Laminate and package using laminate Pending CN116761718A (en)

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Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59176526U (en) * 1983-05-13 1984-11-26 大日本印刷株式会社 Blister packaging paper
JPS6118836U (en) * 1984-07-06 1986-02-03 大日本印刷株式会社 Sterile packaging paper
JPH09202355A (en) * 1996-01-23 1997-08-05 Toppan Printing Co Ltd Sterilizing blister packaging cardboard and blister package
JP2000107268A (en) * 1998-10-01 2000-04-18 Tomoegawa Paper Co Ltd Packaging bag for sterilization
JP2004293004A (en) * 2003-03-28 2004-10-21 Lintec Corp Sterilizing paper and sterilizing vessel
JP6118836B2 (en) 2015-03-31 2017-04-19 本田技研工業株式会社 Body frame of saddle riding type vehicle
JP5920958B1 (en) * 2015-08-18 2016-05-24 香川県 PAPER COATING, PAPER PRODUCT WITH HEAT SEALING, PAPER PACKAGING CONTAINER, AND METHOD FOR PRODUCING PAPER PRODUCT

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