WO2021100584A1

WO2021100584A1 - Method for producing multilayer body, multilayer body and packaging material

Info

Publication number: WO2021100584A1
Application number: PCT/JP2020/042184
Authority: WO
Inventors: 正光新居; 武田　博之
Original assignee: Dic株式会社
Priority date: 2019-11-19
Filing date: 2020-11-12
Publication date: 2021-05-27
Also published as: JP7036283B2; JPWO2021100584A1

Abstract

The present invention provides: a multilayer body which has excellent gas barrier properties; and a packaging material which uses this multilayer body.　A method for producing a multilayer body which has a first base material, a sealant layer and a bonding layer that is arranged between the first base material and the sealant layer, said method comprising: a step wherein a two-pack type adhesive, which contains a polyol composition (I) containing a polyester polyol (A), a polyisocyanate composition (II) and an ester solvent, is applied onto the sealant layer; a step wherein the sealant layer is carried into a drying device and heated, so that the solvent is evaporated from the two-pack type adhesive; a step wherein the sealant layer and the first base material are bonded to each other; and a step wherein the two-pack type adhesive is cured, thereby forming the bonding layer.

Description

Laminate manufacturing method, laminate, packaging material

The present invention relates to a method for producing a laminate, a laminate obtained by using the method, and a packaging material obtained by using the packaging material.

Packaging materials for foods and beverages have not only functions such as strength, resistance to cracking, retort resistance, and heat resistance to protect the contents from various distribution, storage such as refrigeration, and treatment such as heat sterilization. A wide variety of functions such as excellent transparency are required so that the contents can be confirmed.
On the other hand, when the bag is sealed by heat sealing, an unstretched polyolefin film having excellent heat processability is indispensable, but the unstretched polyolefin film has many functions lacking as a packaging material.

For this reason, a composite flexible film in which different types of polymer materials are combined is widely used as the packaging material. Generally, the composite flexible film is composed of a thermoplastic plastic film layer or the like as an outer layer having various functions such as product protection and a thermoplastic plastic film layer or the like as a sealant layer. When visibility of the contents is required as well as a barrier function for maintaining the state of food, a film in which aluminum oxide is vapor-deposited on, for example, a polyethylene terephthalate film (PET film) or a stretched polypropylene film (OPP film) as a plastic film. It has been proposed to use (Patent Document 1).

Japanese Unexamined Patent Publication No. 2001-260266

Recently, as one of the efforts to reduce the environmental load, in order to extend the expiration date and expiration date of food and reduce food loss, packaging materials are required to further improve oxygen barrier property and water vapor barrier property. There is. The present invention has been made to solve at least a part of such a problem, and an object of the present invention is to provide a laminate having excellent gas barrier properties and a packaging material using the laminate.

The present invention is a method for producing a laminate having a first base material, a sealant layer, and an adhesive layer arranged between the first base material and the sealant layer, and is on the sealant layer. A step of applying a two-component adhesive containing a polyol composition (I) containing a polyester polyol (A), a polyisocyanate composition (II), and an ester-based solvent, and a drying apparatus for the sealant layer. The step of evaporating the solvent from the two-component adhesive, the step of bonding the sealant layer and the first base material, and the step of curing the two-component adhesive to the above. The present invention relates to a step of forming an adhesive layer and a method for producing a laminate including.

According to the method for producing a laminate of the present invention, it is possible to provide a laminate having excellent gas barrier properties and a packaging material using the laminate.

It is schematic cross-sectional view which shows one Embodiment of the laminated body manufactured by using the manufacturing method of this invention. It is a schematic block diagram which shows an example of the laminating apparatus used for manufacturing the laminated body of this invention. It is schematic cross-sectional view which shows one Embodiment of the laminated body manufactured by using the manufacturing method of this invention. It is schematic cross-sectional view which shows one Embodiment of the laminated body manufactured by using the manufacturing method of this invention. It is schematic cross-sectional view which shows one Embodiment of the laminated body manufactured by using the manufacturing method of this invention. It is schematic cross-sectional view which shows one Embodiment of the laminated body manufactured by using the manufacturing method of this invention. It is schematic cross-sectional view which shows one Embodiment of the laminated body manufactured by using the manufacturing method of this invention. It is schematic cross-sectional view which shows one Embodiment of the laminated body manufactured by using the manufacturing method of this invention. It is schematic cross-sectional view which shows one Embodiment of the laminated body manufactured by using the manufacturing method of this invention.

<Embodiment 1 of Laminated Body>
FIG. 1 is a schematic cross-sectional view showing an embodiment of a laminated body manufactured by using the manufacturing method of the present invention. The laminate 101 includes a first base material layer, an adhesive layer, an inorganic vapor deposition layer, and a sealant layer in this order, and the adhesive layer is arranged in contact with the first base material layer and the inorganic vapor deposition layer. Are pasted together.

The first base material layer can be used without particular limitation as long as it is a film or sheet having excellent chemical and physical strength (unless otherwise specified below, film is also a general term for film and sheet). Further, the base material may be a single-layer film or a multilayer laminated film. It can be appropriately selected according to the contents and type of the packaging material, which will be described later, and the conditions of use such as the presence or absence of heat treatment after filling the contents.

Specific examples of the base material include low-density polyethylene, medium-density polyethylene, high-density polyethylene, linear (linear) low-density polyethylene, polypropylene, polyvinyl chloride, polyvinyl alcohol, ethylene-vinyl acetate copolymer, ionomer, and ethylene-. (Meta) acrylic acid copolymer, ethylene- (meth) acrylic acid ester copolymer, ethylene-propylene copolymer, methylpentene, polyacrylonitrile, acrylonitrile-styrene copolymer, acrylonitrile-butadiene-styrene copolymer, Polypropylene, polyvinyl chloride (PVC), polyvinylidene chloride (PVDC), vinylidene fluoride (PVDF), ethylene-tetrafluoroethylene copolymer (ETFE), polytetrafluoroethylene (PTFE), polyethylene terephthalate (PET), poly Examples include, but are not limited to, resin films such as butylene terephthalate and polyethylene naphthalate, K-coated stretched polypropylene films, K-coated stretched nylon films, and composite films in which two or more of these films are laminated.

Among them, uniaxial or biaxially stretched polyester films such as polyethylene terephthalate and polyethylene naphthalate, uniaxially or biaxially stretched polyamide films such as nylon 6, nylon 66 and MXD6 (polymethoxylylen adipamide), and biaxially stretched polypropylene films. A biaxially stretched polyethylene film or the like can be preferably used.

The film thickness of the film is not particularly limited, and may be appropriately selected in the range of 1 to 300 μm from the viewpoint of moldability and transparency. It is preferably in the range of 1 to 100 μm. If it is less than 1 μm, the strength is insufficient, and if it exceeds 300 μm, the rigidity becomes too high, which may make processing difficult.

The base film used was some kind of surface treatment, such as corona discharge treatment, ozone treatment, low temperature plasma treatment using oxygen gas or nitrogen gas, physical treatment such as glow discharge treatment, or chemicals. It may be subjected to chemical treatment such as oxidation treatment or other treatment.

As the base film, for example, one or more selected from the above-mentioned resins are used, and the film is manufactured by a conventionally known film forming method such as an extrusion method, a cast molding method, a T-die method, a cutting method, and an inflation method. can do. Alternatively, it can be produced by a multi-layer coextrusion film forming method using two or more kinds of resins selected from the above-mentioned resins. From the viewpoint of film strength, dimensional stability, and heat resistance, the film may be stretched in the uniaxial or biaxial directions by using a tenter method, a tubular method, or the like.

The film as the base material may contain additives as needed. Specifically, improve workability, heat resistance, weather resistance, mechanical properties, dimensional stability, antioxidant properties, slipperiness, mold releasability, flame retardancy, antifungal properties, electrical properties, strength, etc. For the purpose of modification, plastic compounding agents such as lubricants, cross-linking agents, antioxidants, ultraviolet absorbers, light stabilizers, fillers, reinforcing agents, antistatic agents, pigments and the like can be added. The amount of additive added should be adjusted within a range that does not affect other performance.

The sealant layer is a heat-sealing resin layer that can be melted by heat and fused to each other. Suitable resins for the sealant layer include polyethylene, low density polyethylene, medium density polyethylene, high density polyethylene, linear (linear) low density polyethylene, polypropylene, ethylene-vinyl acetate copolymer, ionomer resin, ethylene- ( Olefin resins such as meta) acrylate copolymer, ethylene- (meth) ethyl acrylate copolymer, ethylene-propylene copolymer, methylpentene polymer, polyethylene or polypropylene can be used as acrylic acid, methacrylic acid, maleic anhydride, etc. Fumaric acid and other modified olefin resins modified with unsaturated carboxylic acid, ternary copolymer of ethylene- (meth) acrylic acid ester-unsaturated carboxylic acid, cyclic polyolefin, cyclic olefin copolymer, polyethylene terephthalate (PET), polyacrylonitrile (PAN) and the like. A resin film, sheet, or other coating film made of one or more of these resins can be used as the sealant layer.

As the film to be the sealant layer, any unstretched, uniaxially stretched, or biaxially stretched film can be used.

The stretched film stretched in the biaxial direction is vertically stretched 2 to 4 times by, for example, a roll stretching machine at 50 to 100 ° C., and further laterally stretched 3 to 5 times by a tenter stretching machine in an atmosphere of 90 to 150 ° C. Subsequently, it is obtained by heat treatment with a tenter stretching machine in an atmosphere of 100 to 240 ° C. Alternatively, simultaneous biaxial stretching and sequential biaxial stretching may be used.

An easily peelable sealant film (easy peel film) may be used for the sealant layer. As the easily peelable sealant film, any of the interfacial peeling type, the coagulation peeling type, and the delamination type can be applied, and can be appropriately selected according to the type of the packaging material and the required characteristics described later. The index of easy peelability is appropriately set according to the type of packaging material and the required characteristics, and as an example, the seal strength is 2 to 20 N / 15 mm. For example, easy peeling can be exhibited by a phase-separated polymer blend in which polypropylene is combined with high-density polyethylene, low-density polyethylene, an ethylene-vinyl acetate copolymer, or the like.

The film thickness of the sealant layer can be arbitrarily selected, but when applied to a packaging material described later, for example, it is selected in the range of 5 to 500 μm. It is more preferably 10 to 250 μm, and even more preferably 15 to 100 μm. If it is less than 5 μm, sufficient laminating strength as a packaging material cannot be obtained, and there is a risk that piercing resistance and the like will be lowered. If it exceeds 250 μm, the cost will increase and the film will become hard, resulting in reduced workability.

The inorganic vapor deposition layer can be provided directly on the film to be the sealant layer or via a layer formed by using an anchor coating agent or the like by a conventionally known method. Examples of the method for forming the inorganic vapor deposition layer include a physical vapor deposition method (PVD method) such as a vacuum vapor deposition method, a sputtering method, and an ion plating method, a plasma chemical vapor deposition method, and heat. Examples thereof include a chemical vapor deposition method (Chemical Vapor Deposition method (CVD method)) such as a chemical vapor deposition method and a photochemical vapor deposition method.

In the configuration of FIG. 1, the inorganic vapor deposition layer can be formed of any material such as various metals and their oxides. As an example, aluminum, alumina (aluminum oxide), silica (silicon oxide), a combination thereof (for example, silica and alumina) and the like are preferably used.

The film thickness of the inorganic vapor deposition layer is preferably 1 to 200 nm. When the inorganic vapor-deposited layer is an aluminum-deposited layer, the film thickness is more preferably 1 to 100 nm, and more preferably 15 to 60 nm. When the inorganic vapor deposition layer is silica, alumina, or a dual vapor deposition layer thereof, the film thickness is preferably 1 to 100 nm, more preferably 10 to 50 nm, and even more preferably 20 to 30 nm. ..

An anchor coat layer may be provided on the sealant film prior to the formation of the inorganic vapor deposition layer. The anchor coat layer can be formed by applying an anchor coat agent on a sealant film and drying it. As a result, the adhesion between the sealant layer and the inorganic vapor deposition layer can be improved, and the flatness of the formed surface of the inorganic vapor deposition layer can be improved by the leveling action of the anchor coating agent, and uniform inorganic vapor deposition with few film defects such as cracks can be achieved. Layers can be formed.

Examples of the anchor coating agent include solvent-soluble or water-soluble polyester resin, isocyanate resin, urethane resin, acrylic resin, vinyl alcohol resin, ethylene vinyl alcohol resin, vinyl modified resin, epoxy resin, oxazoline group-containing resin, and modified styrene. Examples thereof include those containing a resin, a modified silicon resin, an alkyl titanate and the like. These can be used alone or in combination of two or more.

The film thickness of the anchor coat layer is not particularly limited, but is preferably about 5 nm to 5 μm, and more preferably 10 nm to 1 μm. As a result, a uniform layer in which internal stress is suppressed can be formed on the sealant film.

When the anchor coat layer is provided, it is also preferable to perform a discharge treatment on the surface of the sealant film prior to forming the anchor coat layer in order to improve the coatability and adhesiveness of the anchor coat agent.

As a sealant film having an inorganic thin-film deposition layer, aluminum-deposited CPP, aluminum-deposited OPP, aluminum-deposited PE, transparent-deposited PET and the like are commercially available, and these can also be used in the production method of the present invention.

The adhesive layer is a cured coating film of a solvent-based two-component adhesive containing a polyester polyol (A)-containing polyol composition (I), a polyisocyanate composition (II), and an ester-based solvent.

The polyester polyol (A) is a reaction product of a polyvalent carboxylic acid and a polyhydric alcohol, and may be urethane-extended with polyisocyanate, and any structure can be used. Among them, a polyester polyol (A1) obtained by reacting a polyester polyol having three or more hydroxyl groups with a carboxylic acid anhydride or a polycarboxylic acid, a polyester polyol having a polymerizable carbon-carbon double bond (A2), and a glycerol skeleton. A polyester polyol (A3) having the above, a polyester polyol (A4) obtained by polycondensing an ortho-oriented polyvalent carboxylic acid with a polyhydric alcohol, and a polyester polyol (A5) having an isocyanul ring are preferably used. Only one kind of these polyester polyols (A) may be used, or two or more kinds thereof may be used in combination. Although details will be described later, these cured coating films of the polyester polyol (A) are particularly excellent in gas barrier properties and are particularly suitable for the production method of the present invention. In the present specification, the adhesive has a gas barrier property when ^{the cured coating film of the adhesive applied with 5 g / m 2} (solid content) of the adhesive has an oxygen barrier property of 300 cc / m ² / day / atm or less. Alternatively, it means that the water vapor barrier property satisfies at least one condition of ^{120 g / m 2 / day or less.}

The polyester polyol (A1) is obtained by reacting a polyester polyol (a1) having three or more hydroxyl groups with a carboxylic acid anhydride or a polyvalent carboxylic acid, and has at least one carboxyl group and two or more hydroxyl groups. Have. The polyester polyol (a1) can be obtained by making a part of the polyvalent carboxylic acid or polyhydric alcohol trivalent or higher.

The polyvalent carboxylic acid used for preparing the polyester polyol (A1) preferably contains at least one of orthophthalic acid and orthophthalic anhydride. Polyester polyols obtained by using these compounds as polyvalent carboxylic acids have excellent gas barrier properties and adhesiveness. It is presumed that the reason why the gas barrier property of the adhesive is excellent by using orthophthalic acid and orthophthalic anhydride is that the rotation of the polyester chain obtained by using orthophthalic acid and its acid anhydride is suppressed. It is presumed that the reason why the adhesiveness is excellent is that the polyester chain exhibits amorphousness due to the asymmetry, and sufficient substrate adhesion is imparted.

Examples of the trivalent or higher polyvalent carboxylic acid include trimellitic acid and its acid anhydride, pyromellitic acid and its acid anhydride. In order to prevent gelation during synthesis, it is preferable to use a trivalent carboxylic acid as a trivalent or higher polyvalent carboxylic acid.

Other polyvalent carboxylic acids may be copolymerized as long as the effects of the present invention are not impaired. Specifically, aliphatic polyvalent carboxylic acids such as succinic acid, adipic acid, azelaic acid, sebacic acid, and dodecandicarboxylic acid; unsaturated bond-containing polyvalent carboxylic acids such as maleic anhydride, maleic acid, and fumaric acid; , 3-Cyclopentanedicarboxylic acid, 1,4-cyclohexanedicarboxylic acid and other alicyclic polyvalent carboxylic acids; terephthalic acid, isophthalic acid, pyromellitic acid, trimellitic acid, 1,4-naphthalenedicarboxylic acid, 2,5 -Naphthalenedicarboxylic acid, 2,6-naphthalenedicarboxylic acid, naphthalic acid, biphenyldicarboxylic acid, 1,2-bis (phenoxy) ethane-p, p'-dicarboxylic acid and acid anhydrides or ester-forming derivatives of these dicarboxylic acids , P-Hydroxybenzoic acid, p- (2-hydroxyethoxy) benzoic acid and aromatic polyvalent carboxylic acids such as ester-forming derivatives of these dihydroxycarboxylic acids, and one or more are used in combination. be able to. Of these, succinic acid, 1,3-cyclopentanedicarboxylic acid, isophthalic acid and acid anhydrides thereof are preferable.

The polyhydric alcohol used for preparing the polyester polyol (A1) preferably contains at least one selected from the group consisting of ethylene glycol, propylene glycol, butylene glycol, neopentyl glycol, and cyclohexanedimethanol. It is presumed that the smaller the number of carbon atoms between oxygen atoms, the less flexible the molecular chain is and the more difficult it is for oxygen to permeate. Therefore, it is particularly preferable to use ethylene glycol.

Examples of the trihydric or higher polyhydric alcohol include glycerin, trimethylolpropane, trimethylolethane, tris (2-hydroxyethyl) isocyanurate, 1,2,4-butanetriol, pentaerythritol, dipentaerythritol and the like. Be done. In order to prevent gelation during synthesis, it is preferable to use a trihydric alcohol as a trihydric or higher polyhydric alcohol.

Other polyhydric alcohols may be copolymerized as long as the effects of the present invention are not impaired. Specifically, 1,5-pentanediol, 3-methyl-1,5-pentanediol, 1,6-hexanediol, methylpentanediol, dimethylbutanediol, butylethylpropanediol, diethylene glycol, triethylene glycol, tetra. Aliper diols such as ethylene glycol, dipropylene glycol and tripropylene glycol; hydroquinone, resorcinol, catechol, naphthalenediol, biphenol, bisphenol A, hisphenol F, tetramethylbiphenol, these ethylene oxide extensions and hydrolyzed fats. Aromatic polyvalent phenols such as ring group can be exemplified.

The polyester polyol (A1) reacts the polyvalent carboxylic acid or its acid anhydride with the polyester polyol (a1) having three or more hydroxyl groups, which is a reaction product of the above-mentioned polyvalent carboxylic acid and polyhydric alcohol. It can be obtained by. The ratio of the hydroxyl group to be reacted with the polyvalent carboxylic acid is preferably 1/3 or less of the hydroxyl group contained in the polyester polyol (a1). The polyvalent carboxylic acid or its acid anhydride to be reacted with the polyester polyol (a1) is preferably divalent or trivalent. Succinic anhydride, maleic anhydride, 1,2-cyclohexanedicarboxylic acid anhydride, 4-cyclohexene-1,2-dicarboxylic acid anhydride, 5-norbornene-2,3-dicarboxylic acid anhydride, phthalic anhydride, 2, Examples thereof include, but are not limited to, 3-naphthalenedicarboxylic acid anhydride and trimellitic acid anhydride.

The polyester polyol (A2) having a polymerizable carbon-carbon double bond can be obtained by using a component having a polymerizable carbon-carbon double bond as a polyvalent carboxylic acid and a polyhydric alcohol.

Maleic anhydride, maleic acid, fumaric acid, 4-cyclohexene-1,2-dicarboxylic acid and its acid anhydride, 3-methyl-4-cyclohexene-1, as polyvalent carboxylic acids having a polymerizable carbon-carbon double bond. , 2-Dicarboxylic acid and its acid anhydride and the like. Of these, maleic anhydride, maleic acid, and fumaric acid are preferable because it is presumed that the smaller the number of carbon atoms, the less flexible the molecular chain is and the more difficult it is for oxygen to permeate.

Other polyvalent carboxylic acids may be copolymerized as long as the effects of the present invention are not impaired. Specifically, aliphatic polyvalent carboxylic acids such as succinic acid, adipic acid, azelaic acid, sebacic acid, and dodecanedicarboxylic acid; alicyclic groups such as 1,3-cyclopentanedicarboxylic acid and 1,4-cyclohexanedicarboxylic acid. Polyvalent carboxylic acid; orthophthalic acid, terephthalic acid, isophthalic acid, pyromellitic acid, trimellitic acid, 1,4-naphthalenedicarboxylic acid, 2,5-naphthalenedicarboxylic acid, 2,6-naphthalenedicarboxylic acid, naphthalic acid, biphenyl Dicarboxylic acid, 1,2-bis (phenoxy) ethane-p, p'-dicarboxylic acid and acid anhydride or ester-forming derivative of these dicarboxylic acids, p-hydroxybenzoic acid, p- (2-hydroxyethoxy) benzoic acid Examples thereof include aromatic polyvalent carboxylic acids such as ester-forming derivatives of these dihydroxycarboxylic acids, and one or more of them can be used in combination. Moreover, these acid anhydrides can also be used. Of these, succinic acid, 1,3-cyclopentanedicarboxylic acid, orthophthalic acid, acid anhydrides of orthophthalic acid, and isophthalic acid are preferable, and orthophthalic acid and its acid anhydride are more preferable, in order to obtain gas barrier properties.

Examples of the polyhydric alcohol having a polymerizable carbon-carbon double bond include 2-butene-1,4-diol and the like.

Other polyhydric alcohols may be copolymerized as long as the effects of the present invention are not impaired. Specifically, ethylene glycol, propylene glycol, butylene glycol, neopentyl glycol, cyclohexanedimethanol, 1,5-pentanediol, 3-methyl-1,5-pentanediol, 1,6-hexanediol, methylpentanediol. , Dimethylbutanediol, butylethylpropanediol, diethylene glycol, triethylene glycol, tetraethylene glycol, dipropylene glycol, tripropylene glycol and other aliphatic diols; hydroquinone, resorcinol, catechol, naphthalenediol, biphenol, bisphenol A, hisphenol F , Tetramethylbiphenol, these ethylene oxide extenders, aromatic polyvalent phenols such as hydrogenated alicyclic group, and the like can be exemplified. Among them, it is presumed that the smaller the number of carbon atoms between oxygen atoms, the less flexible the molecular chain is and the more difficult it is for oxygen to permeate. Therefore, ethylene glycol, propylene glycol, butylene glycol, neopentyl glycol, and cyclohexanedim Methanol is preferred, and ethylene glycol is more preferred.

The polyester polyol (A2) having a polymerizable carbon-carbon double bond is a reaction product of a polyester polyol (a2) having a hydroxyl group and a carboxylic acid having a polymerizable double bond or a carboxylic acid anhydride. You may. Examples of the carboxylic acid having a polymerizable double bond or an acid anhydride thereof include a carboxylic acid having a polymerizable double bond such as maleic acid, maleic anhydride, or fumaric acid, and unsaturated fatty acids such as oleic acid and sorbic acid. Can be mentioned. The polyester polyol (a2) preferably has three or more hydroxyl groups. When the polyester polyol (a2) has two or less hydroxyl groups, the number of hydroxyl groups contained in the polyester polyol (A2) is 0 to 1, and molecular elongation is unlikely to occur during the reaction with the polyisocyanate composition (II) described later. As a result, the adhesive strength and the like may decrease.

The polyester polyol (A2) preferably has a double bond component ratio of 5 to 60% by mass. If it is less than 5% by mass, the number of cross-linking points between the polymerizable double bonds is reduced, and it becomes difficult to obtain gas barrier properties. If it exceeds 60% by mass, the number of cross-linking points increases, and the flexibility of the cured coating film may decrease, making it difficult to obtain adhesive strength. In this specification, the ratio of double bond components in the polyester polyol (A2) is calculated using the following formula (a). In the following formula, the monomer refers to a polyvalent carboxylic acid and a polyhydric alcohol used in the synthesis of polyester polyol (A2).

Further, as the polyester polyol (A2), a drying oil or a semi-drying oil can be mentioned. Examples of the drying oil or semi-drying oil include known and commonly used drying oils and semi-drying oils having a carbon-carbon double bond.

The polyester polyol (A3) having a glycerol skeleton has a glycerol skeleton represented by the following general formula (1).

(In the general formula (1), R ₁ to R ₃ are independently hydrogen atoms or the following general formula (2). However, at least one of _{R 1} to R _{3 is the following general formula (2).} ) Represents a group represented by.)

(In the general formula (2), n represents an integer of 1 to 5, and X is a 1,2-phenylene group, a 1,2-naphthylene group, a 2,3-naphthylene group which may have a substituent. It represents an arylene group selected from the group consisting of a 2,3-anthraquinonediyl group and a 2,3-anthracenediyl group, and Y represents an alkylene group having 2 to 6 carbon atoms.)

Polyester polyol (A3) is _a compound any one of R 1, _{R 2} and _{R 3} is a group represented by the general formula _(2), R 1, _{R 2} and one of _{R 3} 2 two generally formula A mixture of two or more compounds of the compound represented by (2) and the compound represented by the general formula (2) in which all of _{R 1} , R ₂ and R _{3 are represented by the general formula (2).} May be. It is more preferable that all of R ₁ to R ₃ are groups represented by the general formula (2).

In the general formula (2), when X is substituted with a substituent, it may be substituted with one or more substituents, and the substituent is any carbon atom on X different from the free radical. Is bound to. Examples of the substituent include a chloro group, a bromo group, a methyl group, an ethyl group, an i-propyl group, a hydroxyl group, a methoxy group, an ethoxy group, a phenoxy group, a methylthio group, a phenylthio group, a cyano group, a nitro group and an amino group. Examples thereof include a phthalimide group, a carboxyl group, a carbamoyl group, an N-ethylcarbamoyl group, a phenyl group or a naphthyl group.

Specific examples of Y in the general formula (2) include an ethylene group, a propylene group, a butylene group, a neopentylene group, a 1,5-pentylene group, a 3-methyl-1,5-pentylene group, and a 1,6-hexylene group. It is an alkylene group having 2 to 6 carbon atoms, such as a methylpentylene group and a dimethylbutylene group. A propylene group and an ethylene group are preferable, and an ethylene group is more preferable.

The polyester polyol (A3) is obtained by reacting glycerol, an aromatic polyvalent carboxylic acid in which the carboxylic acid is substituted at the ortho position or an acid anhydride thereof, and a polyhydric alcohol as essential components.

Examples of the aromatic polyvalent carboxylic acid in which the carboxylic acid is substituted at the ortho position or an acid anhydride thereof include orthophthalic acid or an acid anhydride thereof, naphthalene 2,3-dicarboxylic acid or an acid anhydride thereof, and naphthalene 1,2-dicarboxylic acid. Examples thereof include an acid or an acid anhydride thereof, anthraquinone 2,3-dicarboxylic acid or an acid anhydride thereof, and 2,3-anthracenecarboxylic acid or an acid anhydride thereof. These compounds may have a substituent on any carbon atom of the aromatic ring. Examples of the substituent include a chloro group, a bromo group, a methyl group, an ethyl group, an i-propyl group, a hydroxyl group, a methoxy group, an ethoxy group, a phenoxy group, a methylthio group, a phenylthio group, a cyano group, a nitro group and an amino group. Examples thereof include a phthalimide group, a carboxyl group, a carbamoyl group, an N-ethylcarbamoyl group, a phenyl group or a naphthyl group.

As the polyvalent carboxylic acid, another polyvalent carboxylic acid may be copolymerized as long as the effect of the present invention is not impaired. Specifically, aliphatic polyvalent carboxylic acids such as succinic acid, adipic acid, azelaic acid, sebacic acid, and dodecandicarboxylic acid; unsaturated bond-containing polyvalent carboxylic acids such as maleic anhydride, maleic acid, and fumaric acid; , 3-Cyclopentanedicarboxylic acid, 1,4-cyclohexanedicarboxylic acid and other alicyclic polyvalent carboxylic acids; terephthalic acid, isophthalic acid, pyromellitic acid, trimellitic acid, 1,4-naphthalenedicarboxylic acid, 2,5 -Naphthalenedicarboxylic acid, 2,6-naphthalenedicarboxylic acid, naphthalic acid, biphenyldicarboxylic acid, diphenic acid and its acid anhydride, 1,2-bis (phenoxy) ethane-p, p'-dicarboxylic acid and these dicarboxylic acids Examples thereof include aromatic polyvalent carboxylic acids such as acid anhydrides or ester-forming derivatives, p-hydroxybenzoic acid, p- (2-hydroxyethoxy) benzoic acid and ester-forming derivatives of these dihydroxycarboxylic acids. Species or two or more species can be used together. Of these, succinic acid, 1,3-cyclopentanedicarboxylic acid, isophthalic acid, 2,6-naphthalenedicarboxylic acid, 1,8-naphthalic acid, and diphenic acid are preferable.

Examples of the polyhydric alcohol include an alkylene diol having 2 to 6 carbon atoms. For example, diols such as ethylene glycol, propylene glycol, butylene glycol, neopentyl glycol, 1,5-pentanediol, 3-methyl-1,5-pentanediol, 1,6-hexanediol, methylpentanediol, and dimethylbutanediol. Can be exemplified.

Further, a polyhydric alcohol other than glycerol and an alkylene diol having 2 to 6 carbon atoms may be copolymerized as long as the effect of the present invention is not impaired. Specifically, aliphatic polyhydric alcohols such as erythritol, pentaerythol, dipentaerythritol, diethylene glycol, triethylene glycol, tetraethylene glycol, dipropylene glycol, tripropylene glycol, tetraethylene glycol and tripropylene glycol, cyclohexanedi. Aliphatic polyhydric alcohols such as methanol and tricyclodecanedimethanol, aromatic polyhydric phenols such as hydroquinone, resorcinol, catechol, naphthalenediol, biphenol, bisphenol A, hisphenol F, tetramethylbiphenol, or ethylene oxide thereof. Elongates and hydrolyzed aliphatic ring groups can be exemplified.

When the polyol composition (A) contains the polyester polyol (A3) as a main component, the content of the glycerol residue contained in the polyester polyol (A3) in the solid content of the gas barrier adhesive is 5% by mass or more. preferable. The glycerol residue refers to a residue (C ₃ H ₅ O ₃ _{= 89.07) excluding R 1} to R ₃ in the general formula (1), and is calculated using the following formula (b).

In the above formula (b), P refers to the polyester polyol (A3). The resin solid content mass of the gas barrier adhesive is determined from the total mass of the polyol composition (I) and the polyisocyanate composition (II) to be used, as well as the diluting solvent, the volatile component contained in the polyisocyanate composition (II), and the inorganic component. The mass is the mass excluding the mass.

The polyester polyol (A4) obtained by polycondensing an ortho-oriented polyvalent carboxylic acid and a polyhydric alcohol is a polyvalent carboxylic acid containing at least one orthophthalic acid and its acid anhydride, ethylene glycol, and propylene. It consists of a polyhydric alcohol containing at least one selected from the group consisting of glycols, butylene glycols, neopentyl glycols, and cyclohexanedimethanol. In particular, a polyester polyol in which the usage rate of the orthophthalic acid and its acid anhydride with respect to the total amount of the polyvalent carboxylic acid is 70 to 100% by mass is preferable.

The polyvalent carboxylic acid requires either orthophthalic acid or an acid anhydride thereof, but other polyvalent carboxylic acids may be copolymerized as long as the effects of the present invention are not impaired. Specifically, the aliphatic polyvalent carboxylic acid includes succinic acid, adipic acid, azelaic acid, sebacic acid, dodecandicarboxylic acid and the like, and the unsaturated bond-containing polyvalent carboxylic acid includes maleic anhydride and maleic acid. Fumaric acid and the like, 1,3-cyclopentanedicarboxylic acid, 1,4-cyclohexanedicarboxylic acid and the like as the alicyclic polyvalent carboxylic acid, and terephthalic acid, isophthalic acid and frangicarboxylic acid as the aromatic polyvalent carboxylic acid. Acid, pyromellitic acid, trimellitic acid, 1,4-naphthalenedicarboxylic acid, 2,5-naphthalenedicarboxylic acid, 2,6-naphthalenedicarboxylic acid, naphthalic acid, biphenyldicarboxylic acid, 1,2-bis (phenoxy) ethane -P, p'-dicarboxylic acids and acid anhydrides or ester-forming derivatives of these dicarboxylic acids; p-hydroxybenzoic acid, p- (2-hydroxyethoxy) benzoic acid and ester-forming derivatives of these dihydroxycarboxylic acids, etc. The polybasic acids of can be used alone or in admixture of two or more. Of these, succinic acid, 1,3-cyclopentanedicarboxylic acid, and isophthalic acid are preferable.

The polyhydric alcohol includes at least one selected from the group consisting of ethylene glycol, propylene glycol, butylene glycol, neopentyl glycol, and cyclohexanedimethanol, but other polyhydric alcohols can be used as long as the effects of the present invention are not impaired. It may be copolymerized. Specifically, 1,5-pentanediol, 3-methyl-1,5-pentanediol, 1,6-hexanediol, methylpentanediol, dimethylbutanediol, butylethylpropanediol, diethylene glycol, triethylene glycol, tetra. Aliper diols such as ethylene glycol, dipropylene glycol and tripropylene glycol; hydroquinone, resorcinol, catechol, naphthalenediol, biphenol, bisphenol A, hisphenol F, tetramethylbiphenol and their ethylene oxide extensions, hydrogenated Aromatic polyhydric phenols such as alicyclic groups can be exemplified.

The polyester polyol (A5) having an isocyanul ring is represented by the following general formula (3).

(In the general formula (3), R ₁ to R ₃ are independently represented by − (CH ₂ ) _n1 −OH (where _n1 represents an integer of 2 to 4) or the following general formula (4). However _{, at least one of R 1} , R ₂ and R ₃ is a group represented by the general formula (4).)

(In the general formula (4), n2 represents an integer of 2 to 4, n3 represents an integer of 1 to 5, and X is a 1,2-phenylene group, a 1,2-naphthylene group, and a 2,3-naphthylene group. , 2,3-anthraquinonediyl group, and 2,3-anthracendiyl group selected from the group and may have a substituent, Y represents an alkylene group having 2 to 6 carbon atoms. Represent.)

Polyester polyol (A5) _includes a compound any one of R 1, _{R 2} and _{R 3} is a group represented by the general formula _(4), R 1, _{R 2} and one of _{R 3} 2 two generally formula A mixture of two or more compounds of the compound represented by (4) and the compound represented by the general formula (4) in which all of _{R 1} , R ₂ and R _{3 are represented by the general formula (4).} May be. It is more preferable that all of R ₁ to R ₃ are groups represented by the general formula (4).

In the general formula (3), the _{alkylene group represented by − (CH2) n1} − may be linear or branched. Of these, n1 is preferably 2 or 3, and most preferably 2.

In the general formula (4), when X is substituted with a substituent, it may be substituted with one or more substituents, and the substituent is any carbon atom on X different from the free radical. Is bound to. Examples of the substituent include a chloro group, a bromo group, a methyl group, an ethyl group, an i-propyl group, a hydroxyl group, a methoxy group, an ethoxy group, a phenoxy group, a methylthio group, a phenylthio group, a cyano group, a nitro group and an amino group. Examples thereof include a phthalimide group, a carboxyl group, a carbamoyl group, an N-ethylcarbamoyl group, a phenyl group or a naphthyl group.

The substituent of X is preferably a hydroxyl group, a cyano group, a nitro group, an amino group, a phthalimide group, a carbamoyl group, an N-ethylcarbamoyl group or a phenyl group, preferably a hydroxyl group, a phenoxy group, a cyano group, a nitro group or a phthalimide group. A phenyl group is more preferred.

Specific examples of Y in the general formula (4) include an ethylene group, a propylene group, a butylene group, a neopentylene group, a 1,5-pentylene group, a 3-methyl-1,5-pentylene group, and a 1,6-hexylene group. It is an alkylene group having 2 to 6 carbon atoms, such as a methylpentylene group and a dimethylbutylene group. A propylene group and an ethylene group are preferable, and an ethylene group is more preferable.

The polyester polyol (A5) is obtained by reacting a triol having an isocyanul ring, an aromatic polyvalent carboxylic acid in which the carboxylic acid is substituted at the ortho position or an acid anhydride thereof, and a polyhydric alcohol as essential components.

Examples of triols having an isocyanuric ring include alkylene oxide adducts of isocyanuric acid such as 1,3,5-tris (2-hydroxyethyl) isocyanuric acid and 1,3,5-tris (2-hydroxypropyl) isocyanuric acid. And so on.

Polyhydric alcohols include alkylene diols having 2 to 6 carbon atoms, specifically ethylene glycol, propylene glycol, butylene glycol, neopentyl glycol, 1,5-pentanediol, 3-methyl-1,5-pentanediol, Examples thereof include diols such as 1,6-hexanediol, methylpentanediol, and dimethylbutanediol.

Among them, 1,3,5-tris (2-hydroxyethyl) isocyanuric acid or 1,3,5-tris (2-hydroxypropyl) isocyanuric acid is used as the triol compound having an isocyanul ring, and the carboxylic acid is in the ortho position. A polyester polyol (A5) having an isocyanul ring using an aromatic polyvalent carboxylic acid substituted with or using orthophthalic anhydride as the acid anhydride and ethylene glycol as the polyhydric alcohol has improved gas barrier properties and adhesiveness. Excellent and preferable.

The isocyanul ring is highly polar and does not form hydrogen bonds. Generally, as a method for improving adhesiveness, a method of blending highly polar functional groups such as a hydroxyl group, a urethane bond, a ureido bond, and an amide bond is known, and a resin having these bonds forms an intermolecular hydrogen bond. It is easy and may impair the solubility in solvents such as ethyl acetate and 2-butanone, which are often used for solvent-based adhesives, but polyester resins having an isocyanul ring do not impair the solubility, so that the solubility is easily impaired. It can be diluted.

Further, since the isocyanul ring is trifunctional, a polyester polyol compound having the isocyanul ring as the center of the resin skeleton and a polyester skeleton having a specific structure in the branched chain can obtain a high crosslink density. It is presumed that by increasing the crosslink density, the gap through which a gas such as oxygen passes can be reduced. As described above, it is presumed that the isocyanul ring has high polarity and a high crosslink density without forming an intermolecular hydrogen bond, so that gas barrier properties and adhesiveness can be ensured.

From this point of view, when the polyol composition (A) contains the polyester polyol (A5) as a main component, the content of the isocyanul ring contained in the polyester polyol (A5) in the solid content of the gas barrier adhesive is 5% by mass. The above is preferable. The isocyanul ring refers to the residue (C ₃ N ₃ O ₃ _{= 126.05) excluding R 1} to R ₃ in the general formula (3), and is calculated using the following formula (b).

In the above formula (c), P refers to a polyester polyol (A5). The resin solid content mass of the gas barrier adhesive is determined from the total mass of the polyol composition (I) and the polyisocyanate composition (II) to be used, the diluting solvent, the volatile component contained in the polyisocyanate composition (II), and the inorganic component. The mass is the mass excluding the mass.

The hydroxyl value of the polyester polyol is preferably 20 mgKOH / g or more and 250 mgKOH / g or less. When the hydroxyl value is smaller than 20 mgKOH / g, the viscosity of the polyol composition (I) becomes high because the molecular weight is too large, and good coating suitability cannot be obtained. When the hydroxyl value exceeds 250 mgKOH / g, the molecular weight is too small and the crosslink density of the cured coating film becomes too high, so that good adhesive strength cannot be obtained.

When the polyester polyol has an acid group, the acid value is preferably 200 mgKOH / g or less. When the acid value exceeds 200 mgKOH / g, the reaction between the polyol composition (I) and the polyisocyanate composition (II) becomes too fast, and good coating suitability cannot be obtained. The lower limit of the acid value of the polyester polyol is not particularly limited, but as an example, it is 20 mgKOH / g or more. When the acid value is 20 mgKOH / g or more, good gas barrier properties and initial cohesive force can be obtained by intermolecular interaction. The hydroxyl value of the polyester polyol can be measured by the hydroxyl value measuring method described in JIS-K0070, and the acid value can be measured by the acid value measuring method described in JIS-K0070.

It is particularly preferable that the number average molecular weight of the polyester polyol as described above is 300 to 5000 because a crosslink density having an excellent balance between adhesiveness and gas barrier property can be obtained. More preferably, the number average molecular weight is 350 to 3000. If the molecular weight is less than 300, the cohesive force of the adhesive at the time of coating becomes too small, and there is a possibility that the film may be displaced at the time of laminating or the bonded film may be lifted. On the other hand, if the molecular weight is higher than 5000, the viscosity at the time of coating becomes too high and the coating cannot be performed, or the adhesiveness is low and the lamination cannot be performed. The number average molecular weight is calculated from the obtained hydroxyl value and the number of functional groups of the designed hydroxyl group.

The glass transition temperature of the polyester polyol is preferably −30 ° C. or higher and 80 ° C. or lower, more preferably 0 ° C. or higher and 60 ° C. or lower, and further preferably 25 ° C. or higher and 60 ° C. or lower. If the glass transition temperature exceeds 80 ° C., the flexibility of the polyester polyol at around room temperature is low, so that the adhesion to the substrate is poor and the adhesiveness may be lowered. On the other hand, if the temperature is lower than -30 ° C, the molecular motion of the polyester polyol at around room temperature is intense, so that sufficient gas barrier properties may not be obtained.

The polyester polyol may be a polyester polyurethane polyol having a number average molecular weight of 1000 to 15000 by urethane elongation of polyester polyols (A1) to (A5) by reaction with a diisocyanate compound. Since the urethane-extended polyester polyol has a molecular weight component of a certain level or more and a urethane bond, it has an excellent gas barrier property, an excellent initial cohesive force, and an excellent adhesive for laminating.

The polyisocyanate composition (II), which is one component of the two-component adhesive, contains an isocyanate compound. As the isocyanate compound, conventionally known compounds can be used without particular limitation, and tetramethylene diisocyanate, hexamethylene diisocyanate, toluene diisocyanate, diphenylmethane diisocyanate, hydride diphenylmethane diisocyanate, xylylene diisocyanate, hydride xylylene diisocyanate, isophorone diisocyanate or Dimeric and trimeric of these isocyanate compounds, and excess amounts of these isocyanate compounds, such as ethylene glycol, propylene glycol, metaxylylene alcohol, 1,3-bishydroxyethylbenzene, 1,4-bishydroxyethylbenzene. , Trimethylol propane, glycerol, pentaerythritol, erythritol, sorbitol, ethylenediamine, monoethanolamine, diethanolamine, triethanolamine, metaxylylene diisocyanate and other low molecular weight active hydrogen compounds and their alkylene oxide adducts, various polyester resins, poly Examples thereof include adducts obtained by reacting with ether polyols, high molecular weight active hydrogen compounds of polyamides, and the like. Polyester polyisocyanate obtained by reacting polyester polyols (A1) to (A5) with a diisocyanate compound in an excess ratio of hydroxyl groups and isocyanate groups may be used. These can be used alone or in combination of two or more.

Further, blocked isocyanate may be used as the isocyanate compound. Examples of the isocyanate blocking agent include phenols such as phenol, thiophenol, methylthiophenol, ethylthiophenol, cresol, xylenol, resorcinol, nitrophenol, and chlorophenol, acetoxime, methylethylketooxime, cyclohexanone oxime, and methanol. Alcohols such as ethanol, propanol and butanol, ethylene chlorohydrin, 1,3-dichloro-2-
Examples thereof include halogen-substituted alcohols such as propanol, tertiary alcohols such as t-butanol and t-pentanol, and lactams such as ε-caprolactam, δ-valerolactam, γ-butyrolactam and β-propyrrolactam. In addition, active methylene compounds such as aromatic amines, imides, acetylacetones, acetoacetate esters, and malonic acid ethyl esters, mercaptans, imines, ureas, diaryl compounds, sodium disulfide and the like can also be mentioned. The blocked isocyanate is obtained by subjecting the above-mentioned isocyanate compound and an isocyanate blocking agent to an addition reaction by a known and commonly used appropriate method.

Of these, xylylene diisocyanate, hydrogenated xylylene diisocyanate, toluene diisocyanate, and diphenylmethane diisocyanate are preferable because good gas barrier properties can be obtained, and isocyanate compounds having a metaxylene skeleton such as metaxylylene diisocyanate and metahydrogenated xylylene diisocyanate are preferable. Is more preferable to use.

Examples of the isocyanate compound having a metaxylene skeleton include a trimer of xylene diisocyanate, a burette compound synthesized by reaction with an amine, and an adduct compound formed by reacting with an alcohol. When the adhesive is a solvent type, it is preferable to use an adduct body because the solubility in the organic solvent used for the solvent type adhesive is better than that of the trimer body and the burette body. As the adduct, an adduct formed by reacting with an alcohol appropriately selected from the above low molecular weight active hydrogen compounds can be used, and among them, ethylene oxide adducts of trimethylolpropane, glycerol, triethanolamine, and metaxylylenediamine can be used. An adduct body with an object is preferable.

When a composition containing a polyester polyol having a carboxylic acid group remaining, such as the polyester polyol (A1), is used as the polyol composition (I), the polyisocyanate composition (II) contains an epoxy compound. You may be. Examples of the epoxy compound include bisphenol A diglycidyl ether and its oligomer, hydride bisphenol A diglycidyl ether and its oligomer, orthophthalic acid diglycidyl ester, isophthalic acid diglycidyl ester, terephthalic acid diglycidyl ester, and p-oxybenzoic acid di. Glycidyl ester, tetrahydrophthalic acid diglycidyl ester, hexahydrophthalic acid diglycidyl ester, succinic acid diglycidyl ester, adipate diglycidyl ester, sebacic acid diglycidyl ester, ethylene glycol diglycidyl ether, propylene glycol diglycidyl ether, 1 , 4-Butanediol diglycidyl ether, 1,6-hexanediol diglycidyl ether and polyalkylene glycol diglycidyl ethers, trimeric acid triglycidyl ester, triglycidyl isocyanurate, 1,4-diglycidyloxybenzene, diglycidyl Examples thereof include propylene urea, glycerol triglycidyl ether, trimethylol ethane triglycidyl ether, trimethylol propane triglycidyl ether, pentaerythritol tetraglycidyl ether, and triglycidyl ether as a glycerol alkylene oxide adduct.

When an epoxy compound is used, a widely known epoxy curing accelerator may be appropriately added for the purpose of accelerating curing as long as the object of the present invention is not impaired.

When a composition containing a polyol having a polymerizable carbon-carbon double bond such as the polyester polyol (A2) is used as the polyol composition (I), in order to promote the polymerization of the carbon-carbon double bond, A known polymerization catalyst can be used in combination, and a transition metal complex is mentioned as an example. The transition metal complex is not particularly limited as long as it is a compound having an ability to oxidatively polymerize a polymerizable double bond. For example, metals such as cobalt, manganese, lead, calcium, cerium, zirconium, zinc, iron, copper, octyl acid, naphthenic acid, neodecanoic acid, stearic acid, resin acid, tall oil fatty acid, tung oil fatty acid, linseed oil fatty acid, Salts with soybean oil fatty acids and the like can be used. The blending amount of the transition metal complex is preferably 0 to 10 parts by mass, more preferably 0 to 3 parts by mass with respect to the resin solid content contained in the polyol composition (I).

The equivalent ratio of the hydroxyl group contained in the polyol composition (I) to the isocyanate group contained in the polyisocyanate composition (II) of the polyol composition (I) and the polyisocyanate composition (II) is 1/0. It is preferably blended so as to be 5 to 1/10, and more preferably to be blended so as to be 1/1 to 1/5. When the isocyanate compound is excessive, the excess isocyanate compound remaining in the cured coating film of the adhesive may bleed out from the adhesive layer. On the other hand, if the reactive functional groups contained in the polyisocyanate composition (II) are insufficient, the adhesive strength may be insufficient.

Various additives may be added to the adhesive as long as the adhesiveness and gas barrier property (when the adhesive has gas barrier property) are not impaired.

An inorganic filler may be used as such an additive. Examples of the inorganic filler include silica, alumina, aluminum flakes, glass flakes and the like. In particular, it is preferable to use a plate-shaped inorganic compound as the inorganic filler because the adhesive strength, gas barrier property, light-shielding property and the like are improved. Plate-like inorganic compounds include hydrous silicates (phyllocate minerals, etc.), kaolinite-serpentine clay minerals (haloisite, kaolinite, enderite, dikite, nacrite, etc., antigolite, chrysotile, etc.), pyrophyllium. Light-Tark (pyrophyllite, talc, kerolai, etc.), smectite clay minerals (montmorillonite, biderite, nontronite, saponite, hectrite, saconite, stivuncite, etc.), vermiculite clay minerals (vermiculite, etc.), mica or Mica clay minerals (white mica, gold mica, etc., margarite, tetracylic mica, teniolite, etc.), green mudstones (cookate, sudowite, clinochloa, chamosite, nimite, etc.), hydrotalcite, plate sulfate Examples thereof include barium, boehmite and aluminum polyphosphate. These minerals may be natural clay minerals or synthetic clay minerals. The plate-like inorganic compound may be used alone or in combination of two or more.

The plate-like inorganic compound may be an ionic compound having an electric charge between layers, or a nonionic compound having no electric charge. The presence or absence of electric charge between layers does not directly affect the gas barrier property of the adhesive layer. However, ionic plate-like inorganic compounds and inorganic compounds that have swelling properties with respect to water are inferior in dispersibility in solvent-type adhesives, and when the amount added is increased, they become thicker with the adhesives or become chyso-friendly. As a result, the coating suitability may decrease. Therefore, the plate-like inorganic compound is preferably nonionic without interlayer electrification.

The average particle size of the plate-shaped inorganic compound is not particularly limited, but as an example, it is preferably 0.1 μm or more, and more preferably 1 μm or more. If it is smaller than 0.1 μm, the detour route of oxygen molecules will not be long, and improvement of gas barrier property cannot be expected sufficiently. The upper limit of the average particle size is not particularly limited, but if the particle size is too large, defects such as streaks may occur on the coated surface depending on the coating method. Therefore, as an example, the average particle size is preferably 100 μm or less, and preferably 20 μm or less. In the present specification, the average particle size of the plate-shaped inorganic compound means the particle size that appears most frequently when the particle size distribution of the plate-shaped inorganic compound is measured by a light scattering type measuring device.

The aspect ratio of the plate-like inorganic compound is preferably high in order to improve the gas barrier property due to the maze effect of oxygen. Specifically, it is preferably 3 or more, more preferably 10 or more, and most preferably 40 or more.

The blending amount of the plate-shaped inorganic compound is arbitrary, but as an example, when the total solid content of the polyol composition (I), the polyisocyanate composition (II), and the plate-shaped inorganic compound is 100 mass, the plate-shaped inorganic compound is formed. The blending amount of the inorganic compound is 5 to 50 parts by mass.

The adhesive may contain an adhesion promoter. Examples of the adhesion accelerator include silane coupling agents such as hydrolyzable alkoxysilane compounds, titanate-based coupling agents, aluminum-based coupling agents, and epoxy resins. Silane coupling agents and titanate-based coupling agents can be expected to have the effect of improving the adhesiveness to various film materials.

If the adhesive layer requires acid resistance, the adhesive may contain a known acid anhydride. Examples of the acid anhydride include phthalic acid anhydride, succinic acid anhydride, het acid anhydride, hymic acid anhydride, maleic acid anhydride, tetrahydrophthalic acid anhydride, hexahydraphthalic acid anhydride, and tetrapromphthalic acid. Anhydride, tetrachlorphthalic anhydride, trimellitic anhydride, pyromellitic anhydride, benzophenotetracarboxylic acid anhydride, 2,3,6,7-naphthalintetracarboxylic acid dianhydride, 5- (2) , 5-Oxotetrahydrofuryl) -3-methyl-3-cyclohexene-1,2-dicarboxylic acid anhydride, maleic anhydride copolymer, and the like.

If necessary, a compound or the like having an oxygen trapping function may be further added. Examples of the compound having an oxygen trapping function include low molecular weight organic compounds that react with oxygen such as hindered phenols, vitamin C, vitamin E, organic phosphorus compounds, gallic acid, and pyrogallol, cobalt, manganese, nickel, iron, and the like. Examples thereof include transition metal compounds such as copper.

In order to improve the adhesiveness to various film materials immediately after application, a tackifier such as xylene resin, terpene resin, phenol resin, rosin resin may be added as needed. When these are added, the blending amount thereof is preferably in the range of 0.01 to 5 parts by mass with respect to 100 parts by mass of the total solid content of the polyol composition (I) and the polyisocyanate composition (II).

When the polyol composition (I) contains a polyester polyol (A2), active energy rays can also be used as a method for reacting the polymerizable carbon-carbon double bond. A known technique can be used as the active energy ray, and it can be cured by irradiating it with ionizing radiation such as electron beam, ultraviolet ray, or γ ray. When curing with ultraviolet rays, a known ultraviolet irradiation device equipped with a high-pressure mercury lamp, an excimer lamp, a metal halide lamp, or the like can be used.

When curing by irradiating with ultraviolet rays, if necessary, 0.1 to 20 parts by mass of a light (polymerization) initiator that generates radicals or the like by irradiation with ultraviolet rays with respect to 100 parts by mass of polyester polyol (A2). It is preferable to add to some extent.

Radical-generating photo (polymerization) initiators include hydrogen abstraction types such as benzyl, benzophenone, Michler's ketone, 2-chlorothioxanthone, and 2,4-diethylthioxanthone, benzoin ethyl ether, diethoxyacetophenone, benzylmethyl ketal, and hydroxy. Examples thereof include photocleavable types such as cyclohexylphenyl ketone and 2-hydroxy-2-methylphenyl ketone. Among these, one can be used alone or a plurality of them can be used in combination.

In addition, the adhesive may contain stabilizers (antioxidants, heat stabilizers, UV absorbers, etc.), plasticizers, antistatic agents, lubricants, blocking inhibitors, colorants, crystal nucleating agents, and the like. These various additives may be added to either or both of the polyol composition (I) and the polyisocyanate composition (II) in advance, or the polyol composition (I) and the polyisocyanate composition ( It may be added when mixing with II).

The adhesive used in the present invention is a solvent-based adhesive, and at least one of the polyol composition (I) and the polyisocyanate composition (II) contains a diluting solvent. The diluting solvent used is toluene, xylene, methylene chloride, tetrahydrofuran, methyl acetate, ethyl acetate, n-propyl acetate, n-butyl acetate, acetone, methyl ethyl ketone (MEK), cyclohexanone, toluol, xylol, n-hexane, cyclohexane. And so on. The solvent used as a reaction medium in the production of the constituent components of the polyol composition (I) or the polyisocyanate composition (II) may be further used as a diluting solvent in coating.

Hereinafter, the method for producing the laminate of the present invention will be described by taking the laminate 101 having such a configuration as an example.

<Manufacturing method of laminated body>
FIG. 2 is a schematic configuration diagram showing an example of a laminating apparatus 10 used for manufacturing the laminated body of the present invention. The laminating device 10 includes film feeding devices 1 and 2, a coating device 3, a drying device 4, a bonding device 5, and a winding device 6.

The film supply device 1 is a device that unwinds the first film W1 from the winding R1 and continuously sends it to the coating device 3. The film supply device 2 is a device that unwinds the second film W2 from the take-up R2 and continuously sends it to the bonding device 5.

Unlike usual, in the production method of the present invention, the sealant film having the inorganic vapor deposition layer is the first film W1 and is set in the take-up R1. The first base material layer is the second film W2 and is set on the take-up R2.

The coating device 3 is a device that applies an adhesive to the first film W1. The coating device 3 includes, for example, an adhesive transfer roll 3a, an impression cylinder 3b, an adhesive tank 3c, a doctor blade 3d, and a smoothing roll 3e. A chamber doctor may be used instead of the adhesive tank 3c and the doctor blade 3d. The adhesive G contained in the adhesive tank 3c is transferred to the first film W1 via the adhesive transfer roll 3a. At this time, the excess adhesive G adhering to the adhesive transfer roll 3a is scraped off by the doctor blade 3d. The impression cylinder 3b is a rotating body that presses the first film W1 with the adhesive transfer roll 3a while winding the first film W1 to attach the adhesive G attached to the adhesive transfer roll 3a to the first film W1. .. The smoothing roll 3e is a rotating body that smoothes the coated surface of the adhesive G transferred to the first film W1 and rotates in a direction opposite to the traveling direction of the film.

The transport speed of the first film W1 and the second film W2 is arbitrarily set, but as an example, it is 80 m / min or more and 300 m / min. It is preferably 100 m / min or more, more preferably 150 m / min or more, preferably 250 m / min or less, and more preferably 200 m / min or less.

The adhesive G contained in the adhesive tank 3c is a mixture of a polyol composition (I) containing a polyester polyol (A), a polyisocyanate composition (II), and a two-component adhesive containing an ester solvent. It is a solvent. The amount of the adhesive G applied is appropriately adjusted, but as an example, the solid content is 1 g / m ² or more and 10 g / m ² or less, preferably 1 g / m ² or more and 5 g / m ² or less.

Subsequently, the first film W1 is conveyed to the drying device 4. The drying device 4 is a device for evaporating the diluting solvent in the adhesive transferred to the first film W1 by heating. As a heating method, a hot air blowing method is widely used. Further, the drying device 4 generally includes a plurality of drying furnaces. When the drying apparatus 4 includes a plurality of drying furnaces, the drying furnaces may be set to the same temperature or may be set to different temperatures.

When a plurality of drying furnaces are provided and the temperatures are set to be different from each other, the temperature of the drying furnace is gradually increased from the drying furnace located on the upstream side to the drying furnace located on the downstream side with respect to the transport direction of the first film W1. Is preferably high. The temperature of the drying furnace is preferably 50 ° C. or higher and 100 ° C. or lower.

The first film W1 that has passed through the drying device 4 is conveyed to the bonding device 5 and bonded to the second film W2 via the adhesive G. The bonding device 5 includes a pair of nip rolls 5a and 5b, and presses and bonds the first film W1 and the second film W2 between the nip rolls 5a and 5b. The nip roll 5a is a rubber roll, and the nip roll 5b is a metal roll. The nip roll 5b includes a heating device (not shown) that regulates the temperature of the adhesive G. The laminated body W3 bonded by the nip rolls 5a and 5b is sent to the winding device 6 through the cooling roll 5c.

Further, the bonding device 5 may be provided with a cooling roll 5c. The cooling roll 5c is arranged between the nip rolls 5a and 5b and the winding device 6, and includes a mechanism for cooling the roll. Examples of the cooling mechanism include a method of passing water through the inside of the roll. After the laminated body W3 is cooled by the cooling roll 5c, tension is applied by the winding device 6 to wind the laminated body W3. As a result, the laminated body W3 is prevented from being wound tightly and curled. The wound laminate W3 is aged at room temperature to 80 ° C. for 12 to 240 hours to obtain the laminate of the present invention.

The production method of the present invention can be applied to the production of various laminates, but is suitable when the first base material is a polyolefin film such as a biaxially stretched polypropylene film or a biaxially stretched polyethylene. Recently, in order to reduce the environmental load, recycling of plastic (an attempt to recycle used plastic as a raw material) is being studied. However, it is difficult to recycle a packaging material composed of a laminate of different types of films such as PET film and OPP film. Therefore, it is being studied to manufacture all the films used for manufacturing the laminate using the same material. Taking the laminate 101 as an example, if an OPP film is used as the first base material layer and an aluminum-deposited CPP is used as the sealant layer having an inorganic vapor-deposited layer, most of the laminate is made of polypropylene, so that it can be recycled more than before. Expected to be easier.

However, as a result of diligent studies by the present inventors on such a laminate, in the production of a laminate using a polyolefin film, the adhesive layer using a solvent-based two-component adhesive containing a polyester polyol is a polyolefin film or a polyolefin film. It was found that the organic solvent remained in the adhesive layer when it came into contact with the printing layer provided above. When the amount of residual solvent in the adhesive layer exceeds a certain standard, the organic solvent remaining in the adhesive layer may migrate to the inside of the packaging material and cause an effect on the human body, changes in the taste and aroma of the contents. Is not acceptable as a laminate for food packaging.

However, according to the production method of the present invention, the amount of residual solvent in the adhesive layer is extremely small even when a polyolefin film such as a polypropylene film or a polyethylene film is used as the first base material layer. Can be done. Therefore, it is possible to provide a laminate that is easy to recycle and has excellent gas barrier properties. The production method of the present invention is particularly effective for an adhesive containing an ester solvent such as methyl acetate, ethyl acetate, n-propyl acetate and n-butyl acetate.

When a sealant layer having an inorganic vapor deposition layer is used as the first film W1, it is preferable to set the tension between the film supply device 1 and the coating device 3 to 25 to 50 N (the width of the first film W1 is 800 mm). For ~ 1000 mm).

Further, when a sealant layer having an inorganic thin-film vapor deposition layer is used as the first film W1, the sealant layer is deformed and cracked in the inorganic thin-film deposition layer while being conveyed through a plurality of rolls or passing through the drying device 4. However, according to the production method of the present invention, the adhesive G having a gas barrier property fills the cracks generated in the inorganic vapor deposition layer, so that the sealant film is laminated with excellent gas barrier properties. Body W3 can be provided.

<Laminated body and other embodiments>
Hereinafter, other laminates that can be produced by using the production method of the present invention will be described, but the present invention is not limited thereto.
FIG. 3 is a schematic cross-sectional view showing another embodiment of the laminate manufactured by using the manufacturing method of the present invention. The laminate 102 includes a first base material layer, a printing layer, an adhesive layer, an inorganic vapor deposition layer, and a sealant layer in this order, and the adhesive layer is arranged in contact with the printing layer and the inorganic vapor deposition layer. It is pasted together. In the laminated body 102, the inorganic vapor deposition layer is vapor-deposited on the sealant layer, and these correspond to the first film W1 in the above-mentioned production method. The first base material layer including the print layer corresponds to the second film W2 in the above-mentioned production method. The adhesive layer is a cured coating film of the above-mentioned adhesive. The laminated body 102 corresponds to the above-mentioned laminated body W3.

As the first base material layer, the same one as that of the laminated body 101 can be used. The printing layer is directly on the first base material layer by various printing inks such as gravure ink, flexo ink, offset ink, stencil ink, and inkjet ink by a general printing method conventionally used for printing on a polymer film. Alternatively, it is formed via another layer (such as a primer layer that improves the adhesion between the base material layer and the printing layer). As the inorganic vapor deposition layer and the sealant layer, the same ones as those of the laminated body 101 can be used.

FIG. 4 is a schematic cross-sectional view showing another embodiment of the laminate manufactured by using the manufacturing method of the present invention. The laminate 103 includes a first base material layer, an adhesive layer, and a sealant layer in this order, and the adhesive layer is arranged in contact with the first base material layer and the sealant layer, and these are bonded together. In the laminated body 103, the sealant layer corresponds to the first film W1 in the above-mentioned production method, and the first base material layer corresponds to the second film W2.

FIG. 5 is a schematic cross-sectional view showing another embodiment of the laminate manufactured by using the manufacturing method of the present invention. The laminate 104 includes a first base material layer, a printing layer, an adhesive layer, and a sealant layer in this order, and the adhesive layer is arranged in contact with the printing layer and the sealant layer, and these are bonded together. In the laminated body 104, the sealant layer corresponds to the first film W1 in the above-mentioned production method, and the first base material layer including the printing layer corresponds to the second film W2. The first base material layer and the sealant layer in the laminate 104 can be the same as those in the laminate 101, and the print layer can be formed in the same manner as in the laminate 102.

FIG. 6 is a schematic cross-sectional view showing another embodiment of the laminate manufactured by using the manufacturing method of the present invention. The laminate 105 includes a first base material layer, an inorganic vapor deposition layer, an adhesive layer, and a sealant layer in this order, and the adhesive layer is arranged in contact with the inorganic vapor deposition layer and the sealant layer, and these are bonded together. .. In the laminated body 105, the inorganic vapor deposition layer is vapor-deposited on the first base material layer. In the laminate 10, the sealant layer corresponds to the first film W1 in the above-mentioned production method, and the first base material layer including the inorganic vapor-deposited layer corresponds to the second film W2 in the above-mentioned production method. As the first base material layer and sealant layer, the same ones as those of the laminated body 101 can be used. The inorganic vapor deposition layer can be provided on the first base material layer in the same manner as the laminated body 101.

FIG. 7 is a schematic cross-sectional view showing another embodiment of the laminate manufactured by using the manufacturing method of the present invention. The laminate 106 includes a first base material layer, an inorganic vapor deposition layer, a printing layer, an adhesive layer, and a sealant layer in this order, and the adhesive layer is arranged in contact with the printing layer and the sealant layer, and these are attached. I'm matching. In the laminated body 106, the sealant layer corresponds to the first film W1 in the above-mentioned production method, and the film provided with the inorganic vapor deposition layer and the printing layer on the first base material layer corresponds to the second film W2.

FIG. 8 is a schematic cross-sectional view showing another embodiment of the laminate manufactured by using the manufacturing method of the present invention. The laminate 107 includes a first base material layer, a first adhesive layer, an inorganic thin-film deposition layer, a second base material layer, a second adhesive layer, and a sealant layer in this order. Adhesion is arranged in contact with the first base material layer and the inorganic thin-film deposition layer, and these are bonded together. In the laminated body 107, the second base material layer having the inorganic vapor deposition layer corresponds to the first film W1 in the above-mentioned production method, and the first base material layer corresponds to the second film W2. As the second base material layer, the same one as the first base material layer exemplified in the laminated body 101 can be used. The second adhesive layer may be the same as or different from the first adhesive layer.

FIG. 9 is a schematic cross-sectional view showing another embodiment of the laminate manufactured by using the manufacturing method of the present invention. The laminate 108 includes a first base material layer, a printing layer, a first adhesive layer, an inorganic thin-film deposition layer, a second base material layer, a second adhesive layer, and a sealant layer in this order. , The first adhesion is arranged in contact with the printing layer and the inorganic vapor deposition layer, and these are bonded together. In the laminated body 108, the second base material layer having the inorganic vapor deposition layer corresponds to the first film W1 in the above-mentioned production method, and the first base material layer having the printed layer corresponds to the second film W2. ..

<Packaging material>
The laminate produced by the production method of the present invention can be used as a multi-layer packaging material for the purpose of protecting foods, pharmaceuticals and the like. When used as a multi-layer packaging material, its layer structure may change depending on the contents, usage environment, and usage pattern.

The packaging material of the present invention is obtained by using a laminate manufactured by the production method of the present invention, laminating the surfaces of the sealant films of the laminate facing each other, and then heat-sealing the peripheral end portions thereof. As a bag-making method, the laminate of the present invention is bent or overlapped so that the inner layer surface (the surface of the sealant film) faces each other, and the peripheral end thereof is, for example, a side seal type or a two-way seal type. Three-way seal type, four-way seal type, envelope-attached seal type, gassho-attached seal type (vertical pillow, horizontal pillow), fold-attached seal type, flat-bottom seal type, square-bottom seal type, gusset type, and other heat-seal types There is a method of heat-sealing. The packaging material of the present invention can take various forms depending on the contents, the environment of use, and the form of use. Self-supporting packaging materials (standing pouches), etc. are also possible. As a heat sealing method, a known method such as a bar seal, a rotary roll seal, a belt seal, an impulse seal, a high frequency seal, and an ultrasonic seal can be used.

After filling the packaging material of the present invention with the contents from the opening, the opening is heat-sealed to manufacture a product using the packaging material of the present invention. The contents to be filled include rice confectionery, bean confectionery, nuts, biscuits / cookies, wafer confectionery, marshmallows, pies, half-baked cakes, candy, snack confectionery and other confectionery, bread, snack noodles, instant noodles, dried noodles, pasta. , Sterile packaged rice, elephant, porridge, packaged rice, staples such as cereal foods, pickles, boiled beans, natto, miso, frozen tofu, tofu, licked mushrooms, konjac, processed wild vegetables, jams, peanut cream, salads, frozen Agricultural processed products such as vegetables and potato processed products, hams, bacon, sausages, chicken processed products, livestock processed products such as confectionery, fish meat hams and sausages, marine products, kamaboko, glue, boiled vegetables, sardines, salted spicy, Processed marine products such as smoked salmon and spicy cod roe, peaches, tangerines, pineapples, apples, pears, cherries and other fruit meats, corn, asparagus, mushrooms, onions, carrots, radishes, potatoes and other vegetables, hamburgers, meats Prepared foods such as balls, fried fishery products, gyoza, croquette and other frozen side dishes, chilled side dishes, butter, margarine, cheese, cream, instant creamy powder, dairy products such as baby-prepared powdered milk, liquid seasonings, retorts Examples include foods such as curry and pet food. In addition, the packaging material of the present invention can also be used as a packaging material for pharmaceuticals such as tobacco, disposable body warmers, infusion packs, cosmetics, and vacuum heat insulating materials.

Alternatively, the packaging material of the present invention may be a lid material using the laminate of the present invention.

Hereinafter, the present invention will be described with reference to Examples and Comparative Examples, but the present invention is not limited thereto. The composition and other values are based on mass unless otherwise specified.

<Adhesive adjustment>
(Adjustment of polyol composition)
92.09 parts of glycerol, 444.36 parts of phthalic anhydride, 186.21 parts of ethylene glycol, and 0.07 of titanium tetraisopropoxide in a polyester reaction vessel equipped with a stirrer, a nitrogen gas introduction tube, a snyder tube, and a condenser. The portion was charged and gradually heated so that the temperature of the upper part of the rectification tube did not exceed 100 ° C. to maintain the internal temperature at 220 ° C. The esterification reaction was terminated when the acid value became 1 mgKOH / g or less to obtain a polyester polyol having a number average molecular weight of 668.60, a hydroxyl value of 250 mgKOH / g, and an acid value of 0.5 mgKOH / g.

70 parts of the polyester polyol synthesized above was placed in a container equipped with a stirrer and heated and stirred at 90 ° C. so that the polyol maintained sufficient fluidity. While stirring, 30 parts of HM6025 (manufactured by HENGHAO, natural mica / non-swellable, plate-shaped, average particle size 10 μm, aspect ratio 100 or more) was added, and the mixture was stirred at 90 ° C. until uniform. This cooled product was used as a polyol composition.

(Preparation of polyisocyanate composition)
Mitsui Chemicals "Takenate D-110N" (trimethylolpropane adduct of metaxylylene diisocyanate non-volatile component 75.0% NCO% 11.5%) and Mitsui Chemicals "Takenate 500" (methoxylylene diisocyanate non-volatile content> 99 %, NCO% 44.6%) was mixed at a ratio of 50/50 (mass ratio) and used as a polyisocyanate composition. The non-volatile content of the polyisocyanate composition is 87.5%, and the NCO% is 28.05%.

(Adhesive adjustment)
100 parts of the polyol composition, 28 parts of the polyisocyanate composition, and 140 parts of ethyl acetate were well stirred to prepare an adhesive.

<Manufacturing of laminate>
(Example 1)
The laminate of Example 1 was produced using a DL-600DX dry laminator (manufactured by Orient Sogyo Co., Ltd.). An aluminum-deposited CPP (manufactured by Toray Film Processing Co., Ltd., VM-CPP, 2203 # 25) having a film thickness of 25 μm was used as the first film W1, and an OPP film having a film thickness of 30 μm (manufactured by Toyobo Co., Ltd., Pyrene P2161) was used as the second film. A finale R794 white G3 coated on top was used so that the film thickness of the dry coating film was 1 μm. The transport speed of the first film W1 and the second film W2 is 120 m / min, the temperature of the drying furnace is 60 ° C., 70 ° C., 80 ° C. from the upstream side in the transport direction of the first film W1, respectively, and the adhesive is applied. The amount (solid content) was set to be ^{3.5 g / m 2.}

(Example 2)
The laminate of Example 2 was produced in the same manner as in Example 1 except that a non-printed film was used as the second film.

(Example 3)
Example 1 except that as the second film W2, a PET film having a film thickness of 12 μm (manufactured by Toyobo Co., Ltd., E5102) coated with Finato R794 white G3 so as to have a film thickness of 1 μm was used. The laminate of Example 3 was produced in the same manner as in the above.

(Example 4)
The laminate of Example 4 was produced in the same manner as in Example 3 except that the second film W2, which was not printed, was used.

(Comparative Example 1) to (Comparative Example 4)
Laminates of Comparative Examples 1 to 4 were produced in the same manner as in Examples 1 to 4 except that the first film W1 and the second film W2 were reversed.

<Evaluation>
(Oxygen permeability)
The aging-finished laminate is adjusted to a size of 10 cm x 10 cm, and OX-TRAN2 / 21 (manufactured by Mocon Co., Ltd .: oxygen permeability measuring device) is used, and according to JIS-K7126 (isopressure method), 23 ° C. 90% RH. Oxygen permeability (OTR) was measured in the atmosphere of. The unit is cc / m ² , day, atm. Note that RH represents humidity. The results are summarized in Tables 1 and 2.

(Measuring method of residual solvent amount)
The obtained laminate was placed in a 500 cc flask and heated at 80 ° C. for 30 minutes. The gas in the flask was measured by gas chromatography and converted into the amount of solvent (mg / m ² ^{) per 1 m 2 of the laminate.} The results are summarized in Tables 1 and 2.

As is clear from Examples and Comparative Examples, the laminate of the present invention has a low oxygen permeability, is excellent in barrier properties, and can also suppress the amount of residual solvent. On the other hand, the laminates of Comparative Examples 1 to 4 are slightly inferior in gas barrier property to the laminates of Examples 1 to 4, and the amount of residual solvent increases remarkably depending on the layer structure of the laminate.

1, 2: Film supply device, 3: Coating device, 3a: Adhesive transfer roll, 3b: Impressor, 3c: Adhesive tank, 3d: Doctor blade, 3e: Smoothing roll, 4: Drying device, 5: Lamination Equipment, 5a: Nip roll (rubber roll), 5b: Nip roll (metal roll), 5c: Cooling roll, 6: Winding equipment, 10: Laminating equipment, W1: First film, W2: Second film, W3: Laminating Body, R1, R2: Winding

Claims

A method for producing a laminate having a first base material, a sealant layer, and an adhesive layer arranged between the first base material and the sealant layer.
A step of applying a two-component adhesive containing a polyester polyol (A)-containing polyol composition (I), a polyisocyanate composition (II), and an ester-based solvent onto the sealant layer.
A step of transporting the sealant layer to a drying device and heating it to evaporate the solvent from the two-component adhesive.
The step of bonding the sealant layer and the first base material, and
A method for producing a laminate, which comprises a step of curing the two-component adhesive to form the adhesive layer.
A laminate manufactured by the manufacturing method according to claim 1.
A packaging material made of the laminate according to claim 2.