Barrier laminates and transfer films

Abstract

The present invention provides a barrier laminate comprising a paper substrate that enables a balance between the slipperiness of the heat-seal layer surface, heat-seal strength, and barrier properties, and a transfer film for manufacturing the barrier laminate. [Solution] A barrier laminate comprising a paper substrate, an adhesive layer, a barrier layer, and a heat seal in this order, further comprising an anchor coat layer between the barrier layer as needed. The exposed surface on the sealing side of the heat seal layer has a dynamic friction coefficient of less than 0.7 against the SUS plate according to a predetermined test method. The heat seal layers are subjected to a temperature of 120°C for 0.5 seconds at 1 kgf / cm². 2 The seal strength at this pressure is 1.8 N / 15 mm width or more.

Description

Technical Field

[0001] The present invention relates to a barrier laminate provided with a paper base material, and a transfer film for producing the barrier laminate.

Background Art

[0002] From the viewpoint of reducing environmental load, it has been studied to improve recyclability by switching conventional packaging materials formed of a laminate obtained by laminating a plurality of plastic films to a configuration mainly composed of paper. Further, even for a configuration mainly composed of paper, since it is necessary to provide gas barrier properties against oxygen, water vapor and the like, barrier laminates using a paper base material have also been studied.

[0003] Patent Document 1 discloses a barrier laminate including a paper base material, an adhesive layer, an inorganic vapor-deposited film, and a heat seal layer, and optionally an anchor coat layer between the inorganic vapor-deposited film and the heat seal layer (Patent Document 1).

Prior Art Literature

Patent Literature

[0004]

Patent Document 1

Summary of the Invention

Problem to be Solved by the Invention

[0005] In a packaging bag formed of a barrier laminate mainly composed of a paper base material, slipperiness may be required on the surface of the heat seal layer (seal surface) depending on the packaging form and application. For example, depending on the content, slipperiness may be required when filling powder or solid into the packaging bag, and also when taking out the content from the package.

[0006] The heat seal layer described in Patent Document 1 is formed on a support substrate as a transfer film, and a barrier layer such as an inorganic vapor deposition layer is formed on the heat seal layer either directly or via an anchor coat layer. Therefore, in order to ensure the barrier properties of the inorganic vapor deposition layer, the heat seal layer is formed smoothly. As a result, it lacks sufficient slipperiness, and further investigation was necessary. [Means for solving the problem]

[0007] The inventors of the present invention conducted diligent research to solve the above problems and found that by adjusting the coefficient of friction on the sealing surface side of the heat seal layer, it is possible to achieve both heat sealability, slipperiness, and barrier properties in the heat seal layer, thus completing the present invention. Specifically, the present invention provides the following.

[0008] (1) Paper substrate and Adhesive layer, Barrier layer, Heat seal layer and A barrier laminate comprising the following in this order: The exposed surface on the sealing side of the heat seal layer has a dynamic friction coefficient of less than 0.7 against the SUS plate as determined by the following test method. The heat seal layers are subjected to a temperature of 120°C for 0.5 seconds at 1 kgf / cm². 2 The seal strength at the given pressure is 1.8 N / 15 mm width or more. Barrier laminate. <Testing Method> In accordance with JIS K7125:1999, under normal temperature and humidity conditions (23°C, 50%RH), a stainless steel table and a heat-sealed layer of a barrier laminate attached to a 200g plate-shaped stainless steel jig are placed facing each other, with the stainless steel jig acting as the load, positioned on the upper side, and the stainless steel jig is pulled at 100 mm / min to measure the frictional force between the stainless steel table and the heat-sealed layer of the barrier laminate.

[0009] (2) The barrier laminate according to (1), wherein the exposed surface on the sealing side of the heat seal layer has a static friction coefficient of less than 0.7 with respect to the SUS plate as determined by the following test method. <Testing Method> In accordance with JIS K7125:1999, under normal temperature and humidity conditions (23°C, 50%RH), a stainless steel table and a heat-sealed layer of a barrier laminate attached to a 200g plate-shaped stainless steel jig are placed facing each other, with the stainless steel jig acting as the load, positioned on the upper side, and the stainless steel jig is pulled at 100 mm / min to measure the frictional force between the stainless steel table and the heat-sealed layer of the barrier laminate.

[0010] (3) The water vapor transmission rate of the barrier laminate at 40°C and 90% RH is 2.5 g / m² 2 A barrier laminate as described in (1), which is less than or equal to 1 day.

[0011] (4) The oxygen permeability of the barrier laminate at 23°C and 90% RH is 2.5 cc / m² 2 A barrier laminate as described in (1), wherein the temperature is less than or equal to day·atm.

[0012] (5) The barrier laminate according to (1), wherein the surface roughness Ra of the exposed surface on the sealing side of the heat seal layer is 0.4 μm or more and 10 μm or less.

[0013] (6) The barrier laminate according to (1), wherein the surface roughness Ra of the surface opposite to the sealing surface of the heat seal layer is 1 nm or more and 400 nm or less.

[0014] (7) The heat seal layer is composed of two or more layers, The surface layer of the heat seal layer, including the exposed surface on the sealing side, is composed of a heat sealant containing a lubricant. The barrier laminate according to (1), wherein the back layer, including the surface opposite to the sealing surface of the heat seal layer, is composed of a heat sealant that does not contain a lubricant. (8) The barrier laminate according to (1), wherein the barrier layer is in contact with the heat seal layer. (9) The barrier laminate according to (1), wherein the barrier layer further comprises an anchor coat layer between itself and the heat seal layer, and the barrier layer and the anchor coat layer are in contact.

[0015] (10) A package in which the contents are packaged using the barrier laminates of (1) to (9), A packaging body in which the contents are sealed by heat sealing the heat-seal layers facing each other at least a portion of the peripheral edge of the barrier laminate.

[0016] (11) A package in which the contents are packaged using the barrier laminates of (1) to (9), A second heat seal layer, identical or different from the heat seal layer, is laminated on the paper substrate of the barrier laminate. A packaging body in which the contents are sealed by overlapping and heat-sealing the heat-seal layer and the second heat-seal layer at least a portion of the peripheral edge of the barrier laminate.

[0017] (12) Peelable support substrate and Heat seal layer and Barrier layer, A transfer film comprising the following in this order: The exposed surface on the sealing side of the heat seal layer has a dynamic friction coefficient of less than 0.7 against the SUS plate as determined by the following test method. The heat seal layers are subjected to a temperature of 120°C for 0.5 seconds at 1 kgf / cm². 2 The seal strength at the given pressure is 1.8 N / 15 mm width or more. Transfer film. <Testing Method> After transferring the transfer film to paper and peeling off the removable support substrate to create a barrier laminate, the frictional force between the SUS table and the heat-sealed layer of the barrier laminate, which is attached to a 200g plate-shaped SUS jig, is placed facing each other in a normal temperature and humidity environment (23°C, 50%RH) according to JIS K7125:1999, with the SUS jig acting as the load, and the SUS jig is pulled at 100 mm / min.

[0018] (13) A method for manufacturing a barrier laminate comprising a paper substrate, an adhesive layer, a barrier layer, a first heat seal layer, and a second heat seal layer in this order, A preparation step to prepare a transfer film in which a first heat seal layer and a barrier layer are provided on a support substrate in that order, A bonding step is to bond the paper substrate to the barrier layer side of the transfer film prepared in the above preparation step via the adhesive layer to form an intermediate laminate. A peeling step is performed to peel the support substrate from the intermediate laminate formed by the above bonding step to expose the first heat seal layer, A heat seal layer formation step involves applying a heat seal layer coating liquid to the surface of the exposed first heat seal layer, drying it, and forming a second heat seal layer. A method for manufacturing a barrier laminate comprising the features described above. [Effects of the Invention]

[0019] The barrier laminate comprising the paper substrate of the present invention provides a barrier laminate with excellent packaging suitability by achieving a balance between heat-sealing properties, slipperiness, and barrier properties in the heat-seal layer. [Brief explanation of the drawing]

[0020] [Figure 1] This is a diagram (cross-sectional view) showing an example of the layer structure of a barrier laminate. [Figure 2] This is a laminated structure diagram (cross-sectional view) showing another example of the layer configuration of a barrier laminate. [Figure 3] This is a laminated structure diagram (cross-sectional view) showing another example of the layer configuration of a barrier laminate. [Figure 4] This is a laminated structure diagram (cross-sectional view) showing an example of the layer structure of a transfer film. [Figure 5] This figure shows one embodiment of a packaging body formed using a barrier laminate. [Figure 6] This figure shows one embodiment of a packaging body formed using a barrier laminate. [Modes for carrying out the invention]

[0021] The following describes specific embodiments of the present invention in detail. However, the present invention is not limited to the following embodiments and can be implemented with appropriate modifications within the scope of the object of the present invention. In this specification, the notation "X~Y" (where X and Y are arbitrary numerical values) means "X or greater and Y or less".

[0022] <<An Embodiment of a Barrier Laminate>> In one embodiment, the barrier laminate of the present invention comprises a base material layer such as a paper substrate, an adhesive layer, a barrier layer, and a heat seal layer in this order in the thickness direction. In one embodiment, the barrier laminate of the present invention comprises a printed layer on the side of the paper substrate layer opposite to the adhesive layer. Furthermore, in one embodiment, the barrier laminate of the present invention includes a surface heat seal layer on the side of the paper substrate layer opposite to the adhesive layer, or on the side of the printed layer opposite to the substrate layer. Furthermore, in one embodiment, the barrier laminate of the present invention includes a protective layer between the barrier layer and the adhesive layer. Furthermore, in one embodiment, the barrier laminate of the present invention further comprises an anchor coat layer between the barrier layer and the heat seal layer. Here, the barrier layer and the heat seal layer or the anchor coat layer (if an anchor coat layer is provided) are in contact. In this embodiment, the barrier laminate does not have a release layer between the barrier layer and the heat seal layer.

[0023] Figure 1 shows an example of the layer structure of a barrier laminate, in a layered configuration diagram (cross-sectional view). The barrier laminate 1(1A) shown in Figure 1 consists of a printing layer 4, a substrate layer 2, an adhesive layer 3, a protective layer 14, a barrier layer 13, an anchor coat layer 12, and a heat seal layer 11, all laminated in this order in the thickness direction. Of the layers in the barrier laminate 1(1A) shown in Figure 1, the protective layer 14, the barrier layer 13, the anchor coat layer 12, and the heat seal layer 11 are configured as a transfer layer 10, which is bonded to the substrate layer 2 via the adhesive layer 3 by a method described later. The transfer film 30 having the transfer layer 10 will be described in detail later.

[0024] In one embodiment, the transfer layer 10 used in the barrier laminate 1 of the present invention does not have a release layer between the heat seal layer 11 and the barrier layer 13, resulting in high adhesion strength between these layers. Therefore, the barrier laminate 1A of one embodiment of the present invention suppresses the occurrence of delamination between layers during the manufacturing process and during use.

[0025] Here, the release layer is a layer typically provided as the surface layer on the transfer support side of the transfer layer in a conventional transfer film comprising a transfer support and a transfer layer, in order to improve the peelability of the transfer layer from the transfer support. That is, the transfer layer includes a release layer as the surface layer on the transfer support side.

[0026] A release layer is typically a layer containing a release agent. Examples of release agents include waxes such as silicone wax, silicone oil, silicone resins, fluororesins, and phosphate esters. In one embodiment, the release layer contains a resin component. Examples of resin components include polyolefin resins, vinyl resins, styrene resins, (meth)acrylic resins, polyester resins, polyurethane resins, polycarbonate resins, polyamide resins, polyimide resins, and cellulose resins.

[0027] Next, we will describe an example of each layer that makes up the layers of a barrier laminate.

[0028] <Base material layer 2> The base material layer 2 uses a paper base material. Here, paper refers to a material manufactured by bonding plant or other fibers together. Furthermore, from the viewpoint of recyclability, it is desirable not to include synthetic paper manufactured using synthetic polymers as a material. Examples of paper base materials include kraft paper, pure white roll paper, fine paper, medium-quality paper, glassine paper, Kent paper, processed paper, cardboard, and synthetic paper. As a paper base material, for example, a paper base material in which a sealing layer or resin layer is formed on one or both sides of the paper material may be used, such as clay-coated paper, lightly coated printing paper, coated printing paper (e.g., coated paper, cast-coated paper, and art paper), resin-coated paper, release paper, and double-sided coated release paper.

[0029] The paper substrate may contain additives. Examples of additives include sizing agents, lubricants, antioxidants, UV absorbers, light stabilizers, antistatic agents, fluorescent whitening agents, fluorescent decolorizing agents, fillers, reinforcing agents, pigments, and dyes. Additives can be added in any amount as needed, as long as they do not adversely affect other properties.

[0030] The surface of the substrate layer 2 on the adhesive layer 3 side may be pre-treated with physical surface treatments such as corona discharge treatment, ozone treatment, plasma treatment, glow discharge treatment, and sandblasting, as well as chemical surface treatments such as oxidation treatment using chemicals.

[0031] In one embodiment, the paper substrate comprises the paper material described above and a sealing layer or resin layer formed on the surface of the paper material facing the adhesive layer 3. The sealing layer has the function of suppressing the penetration of the adhesive constituting the adhesive layer 3 into the paper material and stabilizing the adhesive strength of the adhesive layer 3.

[0032] In one embodiment, the sealing layer or resin layer contains a resin component. Examples of resin components include polyolefin resins such as polyethylene and polypropylene, vinyl resins such as vinyl chloride resins and vinyl acetate resins, styrene resins such as styrene-butadiene copolymers, thermoplastic resins such as (meth)acrylic resins, polyester resins, polyamide resins, polyurethane resins, and cellulose resins; and cured products of thermosetting resins.

[0033] In one embodiment, the sealing layer or resin layer contains additives. Examples of additives include lubricants, antioxidants, ultraviolet absorbers, light stabilizers, antistatic agents, fluorescent whitening agents, fluorescent decolorizing agents, fillers, reinforcing agents, pigments, and dyes. The sealing layer or resin layer preferably contains fillers. Examples of fillers include clay, silica, calcium carbonate, titanium dioxide, and zinc oxide.

[0034] The sealing layer or resin layer can be formed, for example, by a coating method or an extrusion coating method. The thickness of the sealing layer or resin layer is, for example, 0.1 μm or more and 30 μm or less. The lower limit of the thickness of the sealing layer or resin layer is, for example, 0.1 μm or more. The upper limit of the thickness of the sealing layer or resin layer is, for example, 30 μm or less.

[0035] Generally, since the surface of paper is porous and uneven, it is sometimes preferable to form a sealing layer of 20 μm or more on the surface of the paper when directly forming a barrier layer by vapor deposition of inorganic material onto the paper. However, in the present invention, since barrier paper can be manufactured by the transfer method described later, it is not necessary to directly form a barrier layer (inorganic vapor deposition layer) on the paper. Therefore, it is not necessary to form such a thick sealing coat layer on the surface of the paper.

[0036] Furthermore, when forming a barrier layer (inorganic vapor deposition layer) by placing paper material in a vapor deposition apparatus and depositing inorganic material under reduced pressure, paper dust and moisture contained in the paper material can hinder the reduction of pressure inside the vapor deposition apparatus to a suitable atmospheric pressure for vapor deposition. In such cases, it is difficult to form a stable barrier layer (inorganic vapor deposition layer), which can easily result in insufficient adhesion between the formed barrier layer (inorganic vapor deposition layer) and the paper material, leading to unstable gas barrier properties. However, in this embodiment, since barrier paper can be manufactured by the transfer method described later, it is not necessary to place the paper material in the vapor deposition apparatus and directly form a barrier layer (inorganic vapor deposition layer) on the paper material. Therefore, the above-mentioned problems can be avoided.

[0037] As described above, in the present embodiment, as the paper base material, a base material that is made of a paper material and is not impregnated with a resin component, a clay material or the like can be used. Further, in the present embodiment, as the paper base material, a base material that is made of a paper material and includes none of a sealing layer, a resin layer and a clay coat layer can be used.

[0038] The base material layer 2 such as a paper base material may be constituted by one layer, or may be constituted by two or more multilayer layers made of the same or different base materials. The base materials may be laminated by any lamination means via a conventionally known adhesive layer.

[0039] The thickness of the base material layer 2 such as a paper base material is preferably 10 µm or more and 1500 µm or less, more preferably 15 µm or more and 1000 µm or less, and still more preferably 20 µm or more and 500 µm or less. The lower limit of the thickness of the base material layer 2 such as a paper base material is preferably 10 µm or more, more preferably 15 µm or more, and still more preferably 20 µm or more. The upper limit of the thickness of the base material layer 2 such as a paper base material is preferably 1500 µm or less, more preferably 1000 µm or less, and still more preferably 500 µm or less. The basis weight of the paper base material is preferably 15 g / m 2 or more and 1000 g / m 2 or less, more preferably 20 g / m 2 or more and 500 g / m 2 or less. The lower limit of the basis weight of the paper base material is preferably 15 g / m 2 or more, more preferably 20 g / m 2 or more. The upper limit of the basis weight of the paper base material is preferably 1000 g / m 2 or less, more preferably 500 g / m 2 or less. When the base material layer 2 is constituted by multiple layers, the thickness of the base material layer 2 means the total thickness of the multilayer base materials. The same applies to the basis weight.

[0040] With such thickness and / or basis weight, for example, appropriate strength and rigidity can be imparted to the barrier laminate 1. If the thickness and / or basis weight is above the lower limit, for example, curling and warping can be suppressed during the manufacturing of the barrier laminate 1. If the thickness and / or basis weight is below the upper limit, the strength and rigidity will be within an appropriate range, and a decrease in work efficiency can be suppressed. Furthermore, if the paper base layer is made of thin paper, that is, if the basis weight of the paper base layer is set to 100 g / m², 2 The following configuration allows for a reduction in the total thickness of the barrier laminate, and also enables sufficient heat transfer to the heat seal layer when heat is applied from the paper substrate layer side of the barrier laminate, thereby achieving sufficient heat seal strength.

[0041] <Print layer 4> In one embodiment of the present invention, the barrier laminate 1 has a printed layer 4 provided on the surface of the substrate layer 2, such as a paper substrate, that is opposite to the adhesive layer 3.

[0042] The printing layer 4 includes, for example, an image. Examples of images include letters, figures, symbols, pictures, patterns, and combinations thereof. The printing layer 4 is provided, for example, for indicating the contents of the packaging material, indicating the expiration date, indicating the manufacturer and seller, for decoration, and for adding an aesthetic appeal.

[0043] In one embodiment, the printed layer 4 is formed using a printing layer composition such as a thermoplastic resin composition, a thermosetting resin composition, and an active energy ray curable resin composition, each containing a colorant. Specifically, the printed layer 4 contains a thermoplastic resin, a cured product of a thermosetting resin, or a cured product of an active energy ray curable resin, and a colorant.

[0044] The thermoplastic resin composition contains a thermoplastic resin and a colorant. Examples of thermoplastic resins include polyolefin resins, vinyl resins, styrene resins, (meth)acrylic resins, polyester resins, polyurethane resins, polycarbonate resins, polyamide resins, polyimide resins, cellulose resins, petroleum resins, and fluororesins.

[0045] In this specification, the terms "polyolefin resin," etc., are used to include not only "polyolefin resins" but also copolymers that contain, for example, 50% or more (preferably 70% or more, more preferably 80% or more) of the polyolefin main chain, and in which a portion of the main chain is replaced by another main chain different from that of polyolefin. Furthermore, in this specification, the term "(meth)acrylic resin" is used to include both acrylic resins and methacrylic resins. The same applies to the term "(meth)acrylate compound."

[0046] Thermoplastic resin compositions may contain additives. Examples of additives include lubricants, antioxidants, UV absorbers, light stabilizers, antistatic agents, fluorescent whitening agents, fluorescent decolorizing agents, fillers, reinforcing agents, pigments and dyes, dispersants, dispersing aids, and surfactants.

[0047] A thermosetting resin composition is a composition that contains a thermosetting resin, a colorant, and optionally a curing agent, and hardens upon heating. In one embodiment, the thermosetting resin composition is a so-called thermosetting ink.

[0048] Examples of thermosetting resins include phenolic resins, melamine resins, urea resins, epoxy resins, unsaturated polyesters, thermosetting polyurethanes, silicone resins, and (meth)acrylic thermosetting resins. Examples of curing agents include epoxy curing agents and isocyanate curing agents.

[0049] The thermosetting resin composition may contain the same additives as those contained in the thermoplastic resin composition described above.

[0050] The active energy ray curable resin composition is a composition that contains a compound having an active energy ray curable functional group (hereinafter also referred to as "active energy ray curable compound") and a colorant, and is cured by irradiation with active energy rays. In one embodiment, the active energy ray curable resin composition is a so-called ultraviolet curable ink, and preferably a (meth)acrylic ultraviolet curable ink.

[0051] Examples of colorants include pigments and dyes. Specific examples of pigments include titanium dioxide, zinc oxide, carbon black, iron oxide, iron yellow, ultramarine, metallic pigments, pearl pigments, and fluorescent pigments. The printing layer 4 may also be a high-luminosity layer having a high metallic sheen.

[0052] Compositions for printing layers (thermoplastic resin compositions, thermosetting resin compositions, active energy ray curable resin compositions) may contain organic solvents and / or water from the viewpoint of improving coatability and other properties. Examples of organic solvents include hydrocarbon solvents such as toluene and xylene; ketone solvents such as acetone and methyl ethyl ketone; ester solvents such as ethyl acetate, cellosolve acetate and butyl cellosolve acetate; and alcohol solvents such as propanol.

[0053] For example, the printing layer composition may be applied to a substrate layer 2 such as a paper substrate and dried, and then, in the case of a thermosetting resin composition, it may be heated to the temperature required for curing, or in the case of an active energy ray curable resin composition, it may be irradiated with active energy rays to form the printing layer 4. If the printing layer composition does not contain organic solvents and / or water, drying is not necessary.

[0054] Methods for forming the printed layer 4 include, for example, letterpress printing, flexographic printing, gravure printing, offset printing, screen printing, inkjet printing, and thermal transfer printing. The printed layer may be applied to the entire surface of the substrate or to only a portion of it.

[0055] In one embodiment, the printed layer 4 contains a sublimation dye. The printed layer 4 in this embodiment can be formed, for example, by sublimation transfer printing using a thermal transfer sheet. The thickness of the printed layer 4 is preferably 0.01 μm or more and 30 μm or less, more preferably 0.01 μm or more and 10 μm or less, and even more preferably 0.01 μm or more and 5 μm or less. The lower limit of the thickness of the printed layer 4 is preferably 0.01 μm or more. The upper limit of the thickness of the printed layer 4 is preferably 30 μm or less, more preferably 10 μm or less, and even more preferably 5 μm or less.

[0056] <Adhesive layer 3> In one embodiment, the barrier laminate 1 of the present invention includes an adhesive layer 3 between a base layer 2 and a barrier layer 13. In the transfer method described later, the adhesive layer 3 is a layer for bonding a transfer object, such as a base layer 2 having a paper substrate, to a transfer film 30 (transfer layer 10, described later) which includes a support substrate 20, a heat seal layer 11, and a barrier layer 13.

[0057] In one embodiment, the adhesive layer 3 is a layer that contacts the protective layer 14 provided on the side of the barrier layer 13 opposite to the heat seal layer 11. In this embodiment, the adhesive layer 3 protects the barrier layer 13. For example, when a bending load is applied to the barrier laminate 1, the adhesive layer 3 suppresses the occurrence of cracks in the barrier layer 13, and even if minute cracks begin to appear in the barrier layer 13 after the bending load, it suppresses a decrease in gas barrier properties.

[0058] The thickness of the adhesive layer 3 after solvent drying is not particularly limited, but is preferably 0.5 μm or more and 20 μm or less, more preferably 1 μm or more and 15 μm or less. The lower limit of the thickness of the adhesive layer 3 after solvent drying is not particularly limited, but is preferably 0.5 μm or more, more preferably 1 μm or more. The upper limit of the thickness of the adhesive layer 3 after solvent drying is not particularly limited, but is preferably 20 μm or less, more preferably 15 μm or less. The amount of adhesive layer 3 applied after solvent drying is not particularly limited, but preferably 1 g / m². 2More than 20g / m 2 More preferably 2 g / m 2 More than 15g / m 2 The following applies: The lower limit of the amount of adhesive layer 3 applied after solvent drying is not particularly limited, but preferably 1 g / m². 2 More than 2g / m 2 That concludes the explanation. The upper limit of the amount of adhesive layer 3 applied after solvent drying is not particularly limited, but preferably 20 g / m². 2 More preferably 15g / m 2 The following applies:

[0059] The adhesive layer 3 can be formed using a conventionally known adhesive. The adhesive may be a one-component curing type, a two-component curing type, or a non-curing type adhesive. The adhesive may be a solvent-free adhesive or a solvent-based adhesive. The adhesive layer 3 may be formed, for example, by a non-solvent lamination method using a non-solvent adhesive, by a dry lamination method using a dry lamination adhesive, or by a wet lamination method using a wet lamination adhesive. An anchor coat layer may be formed first on the layer on which the adhesive layer 3 is formed, and then the adhesive layer 3 may be formed. The adhesive layer constituting the barrier laminate can be a non-solvent adhesive such as Takenate A-260 (manufactured by Mitsui Chemicals), Takelac A-242B / Takenate A-242A (manufactured by Mitsui Chemicals), Takelac A-244B / Takenate A-244A (manufactured by Mitsui Chemicals), Takelac A-695 / Takenate A-95 (manufactured by Mitsui Chemicals), Takelac A-666 / Takenate A-65 (manufactured by Mitsui Chemicals), Takelac A-670B / Takenate A-670A (manufactured by Mitsui Chemicals), RN-800 / HN-800 (manufactured by Rock Paint Co., Ltd.), RN-200 / HN-100 (manufactured by Rock Paint Co., Ltd.), or RN-230 / HN-230 (manufactured by Rock Paint Co., Ltd.). Furthermore, the adhesive layer constituting the barrier laminate can use polyester resins (e.g., Rock Paint's main component RU-77T / hardener H-7), polyester polyurethane resins (e.g., Rock Paint's main component RU-004 / hardener H-1), or ether resins (e.g., Rock Paint's main component RU-3600 / hardener H-689) as dry laminating adhesives.

[0060] Furthermore, the adhesive layer constituting the barrier laminate may be a hydrolyzable adhesive (wet laminating adhesive) containing at least a water-suspended polymer. The adhesive layer being a cured product of a water-soluble adhesive allows for the creation of a barrier laminate with excellent recyclability. A water-soluble adhesive is an adhesive containing at least a water-suspended polymer, and may also contain an aqueous medium containing water and a water-soluble organic solvent. Here, "water-suspendable polymer" refers to a polymer that is not water-soluble (specifically, has a solubility of 10 g / L or less in water at 25°C) but is finely dispersed in water, such as in an emulsion or suspension. Furthermore, "aqueous medium" refers to a medium containing 50% by mass or more of water, preferably 65% ​​by mass or more, and more preferably 80% by mass or more (upper limit: 100% by mass or less). The adhesive layer being a cured product of a water-soluble adhesive allows for a barrier laminate with excellent recyclability. Specifically, a barrier laminate comprising a paper substrate and an adhesive layer being a cured product of a water-soluble adhesive has a pulp recovery rate of 80% by mass or more, preferably 85% by mass or more, and more preferably 90% by mass or more, of the paper substrate according to the disintegration method of JIS P8220:2012. The barrier laminate of this disclosure has a pulp recovery rate of 80% by mass or more after redisintegration and exhibits excellent recyclability. The content of water-suspended polymers in the hydrolyzable adhesive is preferably 32% by mass or less, more preferably 30% by mass or less, from the viewpoint of recyclability, and preferably 2% by mass or more, more preferably 5% by mass or more, even more preferably 10% by mass or more, and even more preferably 15% by mass or more, from the viewpoint of improving adhesion to paper substrates and transfer films and further improving barrier properties. The adhesive layer and the hydrolyzable adhesive may contain additives. Examples of additives include dispersants, surfactants, antioxidants, UV absorbers, light stabilizers, antistatic agents, fluorescent whitening agents, fluorescent decolorizing agents, plasticizers, lubricants, mold release agents, fillers, reinforcing agents, antiblocking agents, flame retardants, crosslinking agents, pigments, and dyes. Examples of commercially available hydrolyzable adhesives include RC-1500, GHA-302S, DBA-137, DBA-155L, AC-60, PZ-804, PZ-905, PZ-907 (all manufactured by Saiden Chemical), and RAN-032-4A, AV-650Y-5LL, AV-880L (all manufactured by Nichiei Chemical).

[0061] <Heat seal layer 11> In one embodiment, the barrier laminate 1(1A) of the present invention includes a heat-seal layer 11. The heat-seal layer 11 functions as a heat-sealable sealant layer when the barrier laminate 1 is used as a packaging material, for example. Furthermore, when the barrier laminate 1, such as barrier paper, is manufactured by a transfer method described later, the heat-seal layer 11 also functions as a release layer from the support substrate 20 that constitutes the transfer film 30 described later.

[0062] The heat-seal layer 11 is a layer that has heat-seal properties, specifically a layer that can be bonded to an object by heating and pressing, or a layer that can be bonded by fusing heat-seal layers to each other by heating and pressing. It should be noted that there is no prejudice to using the transfer film 30 of the present invention for applications that do not require heat sealing.

[0063] Furthermore, in the barrier laminate 1(1A) of the present invention, the exposed surface on the sealing side of the heat seal layer has a dynamic friction coefficient of less than 0.7 against the SUS plate as determined by the following test method, and the heat seal layers are subjected to 1 kgf / cm² at 120°C for 0.5 seconds (hereinafter referred to as 120°C × 0.5 seconds). 2 It is characterized by having a sealing strength of 1.8 N / 15 mm width or more at a given pressure.

[0064] Here, the coefficient of dynamic friction with respect to the SUS plate can be determined in accordance with JIS K7125:1999 by placing a SUS table and a heat-sealing layer of a barrier laminate attached to a 200g plate-shaped SUS jig facing each other in a normal temperature and humidity environment (23°C, 50%RH), with the SUS jig positioned on the upper side so that it acts as a load, and pulling the SUS jig at 100 mm / min, while measuring the frictional force between the SUS table and the heat-sealing layer of the barrier laminate. It is preferable to measure the coefficient of dynamic friction five times using this method and calculate the average value.

[0065] In this way, by ensuring that the coefficient of dynamic friction between the exposed surface of the heat seal layer and the SUS plate, and the sealing strength between the heat seal layers are within a predetermined range, it is possible to achieve both heat sealing properties and slipperiness in the heat seal layer.

[0066] Furthermore, the coefficient of dynamic friction of the exposed surface on the sealing side of the heat seal layer with respect to the SUS plate is preferably less than 0.6, and more preferably less than 0.5. The lower limit of the coefficient of dynamic friction of the exposed surface on the sealing side of the heat seal layer with respect to the SUS plate is not particularly limited, but is preferably 0.01 or higher.

[0067] Heat sealing layers at 120°C for 0.5 seconds, 1 kgf / cm². 2 The seal strength at this pressure is preferably 1.9 N / 15 mm width or more, and more preferably 2.0 N / 15 mm width or more. 2The upper limit of the seal strength at the given pressure is not particularly limited, but it is preferably 30 N / 15 mm width or less. Additionally, the heat seal between the layers was 120°C for 0.3 seconds at 1 kgf / cm². 2 The sealing strength at the given pressure is preferably 1.5 N / 15 mm width or more, more preferably 1.7 N / 15 mm width or more, and even more preferably 1.8 N / 15 mm width or more. Note: 120°C × 0.1 seconds, 1 kgf / cm² 2 When heat-seal layers are bonded together by pressure, the seal strength is insufficient, and in the delamination state evaluation described later, delamination occurs between the heat-seal layers, which is undesirable.

[0068] Furthermore, the static friction coefficient of the exposed surface on the sealing side of the heat seal layer with respect to the SUS plate is preferably less than 0.7, more preferably less than 0.6, and even more preferably less than 0.5. The lower limit of the static friction coefficient of the exposed surface on the sealing side of the heat seal layer with respect to the SUS plate is not particularly limited, but is preferably 0.01 or higher.

[0069] Here, the static friction coefficient with respect to the SUS plate can be determined in accordance with JIS K7125:1999 by placing a SUS table and a heat-sealing layer of a barrier laminate attached to a 200g plate-shaped SUS jig facing each other in a normal temperature and humidity environment (23°C, 50%RH), with the SUS jig positioned on the upper side so that it acts as a load, and pulling the SUS jig at 100 mm / min, while measuring the frictional force between the SUS table and the heat-sealing layer of the barrier laminate. It is preferable to measure the static friction coefficient five times using this method and calculate the average value.

[0070] Furthermore, the surface roughness Ra of the exposed surface on the sealing side of the heat seal layer is preferably 0.4 μm or more and 10 μm or less, and more preferably 0.5 μm or more and 9 μm or less. The lower limit of the surface roughness Ra of the exposed surface on the sealing side of the heat seal layer is preferably 0.4 μm or more, and more preferably 0.5 μm or more. The upper limit of the surface roughness Ra of the exposed surface on the sealing side of the heat seal layer is preferably 10 μm or less, and more preferably 9 μm or less. Note that the surface roughness Ra of the exposed surface on the sealing side of the heat seal layer is the arithmetic mean roughness as defined in JIS-B0601.

[0071] If the surface roughness Ra of the exposed surface on the sealing side of the heat seal layer is less than 0.4 μm, the exposed surface on the sealing side of the heat seal layer becomes too flat, and when the barrier laminate 1 is used as a packaging material, the contents tend to adhere more closely to the heat seal layer. Also, if the surface roughness Ra of the exposed surface on the sealing side of the heat seal layer is greater than 10 μm, the contact area when the exposed surfaces of the heat seal layers come into contact with each other decreases, which tends to make it more difficult to achieve a relatively stable heat seal strength.

[0072] Furthermore, the surface roughness Ra of the surface of the heat seal layer opposite the sealing surface is preferably 1 nm to 400 nm, and more preferably 10 nm to 350 nm. The lower limit of the surface roughness Ra of the surface of the heat seal layer opposite the sealing surface is preferably 1 nm or more, and more preferably 10 nm or more. The upper limit of the surface roughness Ra of the surface of the heat seal layer opposite the sealing surface is preferably 400 nm or less, and more preferably 350 nm or less. Note that the surface roughness Ra of the surface of the heat seal layer opposite the sealing surface is the arithmetic mean roughness as defined in JIS-B0601. If the surface roughness Ra of the surface of the heat seal layer opposite the sealing surface is greater than 400 nm, thickness unevenness will occur in the barrier layer due to the surface roughness, and the barrier properties and stability of the barrier layer tend to decrease relatively. Furthermore, there is no particular limit to the lower limit of the surface roughness Ra of the surface of the heat seal layer opposite the sealing surface, but it is preferably about 1 nm or more.

[0073] The static friction coefficient, dynamic friction coefficient, surface roughness Ra, and friction between the heat seal layer 11 and the SUS plate on the opposite side of the seal surface are all measured at 120°C for 0.5 seconds and 1 kgf / cm². 2 The sealing strength at the given pressure can be controlled by adjusting the components of the coating agent used to form the heat seal layer (e.g., lubricant and resin components). Alternatively, commercially available products such as HYDRECT AD-1(A) (manufactured by DIC Corporation), used in the examples, can also be employed. Furthermore, as described later, the uneven surface (matte surface) of the support substrate can be transferred to the exposed surface to create the uneven surface.

[0074] In one embodiment, the heat seal layer 11 is formed by applying a heat seal coating liquid to the barrier layer or heat seal layer, and then drying the heat seal coating liquid. Examples of heat seal coating liquids include aqueous heat seal coating liquids containing water. It is preferable that the aqueous heat seal coating liquid is applied to the barrier layer or heat seal layer in a state where a heat-sealable resin or the like is dispersed in water (dispersion, suspension, or emulsion).

[0075] The resin component of the coating liquid for the heat seal layer can be, for example, a thermoplastic resin. Examples of thermoplastic resins include olefin resins and (meth)acrylic resins. Among these, (meth)acrylic resins are preferred. By including a (meth)acrylic resin, blocking of the resulting heat seal layer can be effectively suppressed.

[0076] As the olefin resin, polyethylene resins are preferred, such as high-density polyethylene, medium-density polyethylene, low-density polyethylene, linear low-density polyethylene and ultra-low-density polyethylene, ethylene-vinyl acetate copolymer resin, ethylene (meth)acrylic copolymer resin, ethylene-vinyl chloride copolymer resin, ethylene-vinyl acetate-vinyl chloride copolymer resin, and ethylene-vinyl acetate-acrylic copolymer resin. From the viewpoint of reducing environmental impact, biomass-derived polyethylene and / or recycled polyethylene may be used. The ethylene-vinyl acetate copolymer resin may contain other polymerization components such as acrylic acid esters or acrylic acid.

[0077] As the acrylic resin, for example, one obtained by addition polymerization of one or more acrylic monomers selected from acrylic acid, methacrylic acid, acrylic acid esters, and methacrylic acid esters can be used. The acrylic monomer may be a comonomer having functional groups such as hydroxyl groups, epoxy groups, and amino groups in its molecular structure. The acrylic resin may also be an ionomer.

[0078] Furthermore, as will be described later, when manufactured by a transfer method, it is preferable to form the heat seal layer using a heat seal layer coating solution containing a thermoplastic ionomer. Ionomers are a general term for synthetic resins in which polymers are aggregated using the cohesive force of metal ions.

[0079] Examples of the above-mentioned metal ions include alkali metal ions and alkaline earth metal ions, specifically sodium, potassium, calcium, magnesium, and zinc.

[0080] The heat seal layer is typically an unstretched layer. For example, a heat seal layer can be formed by applying and drying a coating agent containing a thermoplastic resin onto a support substrate, or by melt-extruding a resin composition containing an olefin polymer onto a support substrate.

[0081] Furthermore, the coating liquid for the heat seal layer (heat seal layer) may contain a lubricant. By including a lubricant in the heat sealant constituting the heat seal layer, the surface roughness Ra of the exposed surface on the sealing side of the heat seal layer can be increased. This makes it possible to adjust the static friction coefficient and dynamic friction coefficient of the exposed surface on the sealing side of the heat seal layer with respect to the SUS plate, as well as the sealing strength between the heat seal layers, to a desired range.

[0082] Examples of lubricants include pigments such as kaolin, talc, calcium bicarbonate, titanium dioxide, and silica; particles such as hollow beads or microcapsules; waxes; metal soaps; and fatty acid esters. Lubricants may be used individually or in combination of two or more.

[0083] The lubricant content in the heat seal layer is preferably 0.2 parts by mass or more and 35 parts by mass or less, more preferably 0.4 parts by mass or more and 30 parts by mass or less, and even more preferably 0.6 parts by mass or more and 25 parts by mass or less, per 100 parts by mass of resin contained in the heat seal layer. The lower limit of the lubricant content in the heat seal layer is preferably 0.2 parts by mass or more, more preferably 0.4 parts by mass or more, and even more preferably 0.6 parts by mass or more, per 100 parts by mass of resin contained in the heat seal layer. The upper limit of the lubricant content in the heat seal layer is preferably 35 parts by mass or less, more preferably 30 parts by mass or less, and even more preferably 25 parts by mass or less, per 100 parts by mass of resin contained in the heat seal layer.

[0084] Examples of solvents for the heat seal layer coating liquid include water; alcohol solvents such as methanol, ethanol, 2-propanol, and 1-butanol; ketone solvents such as acetone, methyl ethyl ketone, methyl isobutyl ketone, and cyclohexanone; glycol solvents such as ethylene glycol monomethyl ether, ethylene glycol monoethyl ether, ethylene glycol monobutyl ether, propylene glycol monomethyl ether, ethylene glycol monoethyl ether acetate, and propylene glycol monomethyl ether acetate; ester solvents such as methyl acetate, ethyl acetate, and butyl acetate; hydrocarbon solvents such as n-hexane, cyclohexane, benzene, toluene, and xylene; halogenated hydrocarbon solvents such as methylene chloride and chloroform; ether solvents such as dioxolane and tetrahydrofuran; nitrogen-containing solvents such as acetonitrile and N,N-dimethylformamide; and sulfur-containing solvents such as dimethyl sulfoxide.

[0085] For the preparation of the coating solution for the heat seal layer, it is preferable to use an ionomer emulsion, more preferable to use a self-emulsifying emulsion, and even more preferable to use a self-emulsifying emulsion of a metal salt of an ethylene-(meth)acrylic acid copolymer.

[0086] It is preferable to use an aqueous ionomer emulsion as the emulsion described above. Such emulsions allow for relatively low control of the coating amount and, since there are no VOE emissions, it is possible to obtain packaging materials with a low environmental impact.

[0087] Examples of commercially available coating liquids for heat seal layers include HYDRECT AD-1(A), HYDBAR99 (both manufactured by DIC Corporation), Chemipearl S120, Chemipearl S300, Chemipearl S500 (all manufactured by Mitsui Chemicals), and Joncryl HPB4110, Joncryl PDX7616A, Joncryl HSL9010, and Joncryl HSL9012 (manufactured by BASF Japan).

[0088] The thickness of the heat seal layer is not particularly limited, but is preferably 1 μm to 15 μm, more preferably 1.5 μm to 13 μm, and even more preferably 2 μm to 11 μm. The lower limit of the heat seal layer thickness is not particularly limited, but is preferably 1 μm or more, more preferably 1.5 μm or more, and even more preferably 2 μm or more. The upper limit of the heat seal layer thickness is not particularly limited, but is preferably 15 μm or less, more preferably 13 μm or less, and even more preferably 11 μm or less. The thickness of the heat seal layer may be appropriately changed depending on the strength of the heat seal layer, the processability of the transfer film, and the mass of the contents filled into the packaging material manufactured using the barrier laminate.

[0089] One embodiment of the heat seal layer 11 will be described using Figure 1. The heat seal layer of the barrier laminate 1 shown in Figure 1 is composed of two layers, a first heat seal layer 11a and a second heat seal layer 11b, in order from the anchor coat layer 12 side.

[0090] In the barrier laminate 1 shown in Figure 1, the first heat seal layer 11a, which is a back layer including the surface opposite to the sealing surface of the heat seal layer, is made of a heat sealant that does not contain a lubricant, and the second heat seal layer 11b, which is a surface layer including the exposed surface on the sealing surface side, is made of a heat sealant that contains a lubricant.

[0091] By including a lubricant in the heat sealant constituting the heat seal layer, the surface roughness Ra of the exposed surface on the sealing side of the heat seal layer can be increased. This allows the static friction coefficient and dynamic friction coefficient of the exposed surface on the sealing side of the heat seal layer with respect to the SUS plate, as well as the sealing strength between the heat seal layers, to be adjusted to a desired range.

[0092] Specifically, the second heat seal layer 11b, which is located on the sealing surface side (outermost) of the barrier laminate 1, contains a predetermined amount of lubricant, while the first heat seal layer 11a, which is located on the opposite side (inside) of the sealing surface of the second heat seal layer 11b, does not contain lubricant. By configuring the second heat seal layer 11b to contain a predetermined amount of lubricant, the coefficient of dynamic friction between the heat seal layer and the SUS plate on the exposed surface side of the sealing surface is kept within a predetermined range, while the friction between the heat seal layers is maintained at 120°C × 0.5 seconds, 1 kgf / cm². 2 The seal strength at the given pressure can be set to a predetermined range.

[0093] On the other hand, by configuring the first heat seal layer 11a, which is located on the opposite side (inside) of the sealing surface of the second heat seal layer 11b, to be lubricant-free and reducing the surface roughness Ra, it is possible to suppress the occurrence of thickness unevenness in other layers (e.g., barrier layer, anchor coat layer, etc.). For example, if the first heat seal layer 11a is configured to contain a lubricant, the surface roughness Ra of the surface on the opposite side of the sealing surface will increase, causing thickness unevenness in other layers such as the barrier layer and anchor coat layer, and tending to reduce the barrier properties of the barrier layer. In particular, when an inorganic vapor-deposited layer formed by depositing inorganic material is laminated as the barrier layer, if the first heat seal layer 11a is configured to contain a lubricant, it becomes difficult to laminate a uniform inorganic vapor-deposited layer during film formation, and the barrier properties of the inorganic vapor-deposited layer tend to decrease. By including a predetermined amount of lubricant in the second heat seal layer 11b, which is positioned on the sealing surface side (outermost), and not including or excluding lubricant in the first heat seal layer 11a, which is positioned on the opposite side (inside) of the second heat seal layer 11b (inside), it is possible to control the coefficient of dynamic friction on the exposed surface of the heat seal layer on the sealing surface side and the sealing strength between the heat seal layers to a desired range, while suppressing the occurrence of thickness unevenness in other layers (e.g., barrier layer, anchor coat layer, etc.).

[0094] The surface roughness Ra of the surface (barrier layer side) of the first heat seal layer 11a, which is located on the opposite side (inside) of the sealing surface of the second heat seal layer 11b, is preferably 1 nm or more and 400 nm or less, and more preferably 10 nm or more and 350 nm or less. The lower limit of the surface roughness Ra of the surface (barrier layer side) of the first heat seal layer 11a, which is located on the opposite side (inside) of the sealing surface of the second heat seal layer 11b, is preferably 1 nm or more, and more preferably 10 nm or more. The upper limit of the surface roughness Ra of the surface (barrier layer side) of the first heat seal layer 11a, which is located on the opposite side (inside) of the sealing surface of the second heat seal layer 11b, is preferably 400 nm or less, and more preferably 350 nm or less.

[0095] The surface roughness Ra of the exposed surface on the sealing side of the second heat seal layer 11b, which is located on the sealing side (outermost), is preferably 0.4 μm or more and 10 μm or less, and more preferably 0.5 μm or more and 9 μm or less. The lower limit of the surface roughness Ra of the exposed surface on the sealing side of the second heat seal layer 11b, which is located on the sealing side (outermost), is preferably 0.4 μm or more, and more preferably 0.5 μm or more. The upper limit of the surface roughness Ra of the exposed surface on the sealing side of the second heat seal layer 11b, which is located on the sealing side (outermost), is preferably 10 μm or less, and more preferably 9 μm or less.

[0096] <Anchor coat layer 12> In one embodiment, the barrier laminate 1(1A) of the present invention may further include an anchor coat layer 12 between the heat seal layer 11 and the barrier layer 13. By providing the anchor coat layer 12, the adhesion between the heat seal layer 11 and the barrier layer 13 can be improved, and the occurrence of delamination between these layers can be suppressed. The anchor coat layer 12 may, for example, be in contact with the barrier layer 13 on one side and in contact with the heat seal layer 11 on the other side.

[0097] In one embodiment, the anchor coat layer 12 contains a resin component. Examples of the resin component include thermoplastic resins such as polyolefin resins (e.g., polyethylene resins and polypropylene resins), vinyl resins, styrene resins, (meth)acrylic resins, polyester resins, polyurethane resins, and polyamide resins; and cured products of thermosetting resins such as phenolic resins, melamine resins, epoxy resins, alkyd resins, thermosetting (meth)acrylic resins, unsaturated polyester resins, and thermosetting polyurethane resins. When using a thermosetting resin, it is preferable to use a curing agent such as an amine compound, a phenolic compound, an isocyanate compound, and a carboxylic acid compound in combination.

[0098] As for the resin component, polyester resins are preferred, for example, from the viewpoint of adhesion. Examples of polyester resins include polymers synthesized by polycondensation of acidic components such as polycarboxylic acids, their esters and acid anhydrides with polyhydric alcohols, lactone ring-opening polymers, polyhydroxycarboxylic acid polymers, urea-modified polyesters, and urethane-modified polyesters. Urethane-modified polyesters are polyesters that have urethane bonds.

[0099] The thickness of the anchor coat layer is preferably 0.01 μm or more and 10 μm or less, more preferably 0.05 μm or more and 5 μm or less, and even more preferably 0.1 μm or more and 3 μm or less. The lower limit of the thickness of the anchor coat layer is preferably 0.01 μm or more, more preferably 0.05 μm or more, and even more preferably 0.1 μm or more. The upper limit of the thickness of the anchor coat layer is preferably 10 μm or less, more preferably 5 μm or less, and even more preferably 3 μm or less. If the thickness is above the lower limit, for example, sufficient adhesion strength can be obtained between the heat seal layer and the barrier layer. If the thickness is below the upper limit, for example, the anchor coat layer can be formed well on the heat seal layer.

[0100] <Barrier layer 13> The barrier laminate 1(1A) of the present invention comprises a barrier layer 13. Preferably, the barrier layer 13 is a layer formed directly on one side of the heat seal layer 11, or, if an anchor coat layer 12 is provided, on one side of the anchor coat layer 12.

[0101] The barrier layer 13 is a layer that suppresses the permeation of gases such as oxygen gas and water vapor. Therefore, for example, the barrier laminate 1 obtained by transferring the transfer layer 10 from the transfer film 30 (described later) to the object to be transferred has excellent gas barrier properties. If the barrier layer 13 is an opaque layer, the barrier layer 13 may also have light-shielding properties against sunlight and fragrance-retaining properties for the contents.

[0102] The barrier layer 13 may be, for example, a metal vapor-deposited film formed by depositing a metal, or a vapor-deposited film formed by depositing an inorganic compound. In this specification, a layer formed by depositing such an inorganic material is referred to as an inorganic vapor-deposited layer.

[0103] Examples of metals that can constitute the metal vapor deposition layer include aluminum, chromium, tin, nickel, copper, silver, gold, and platinum. Among these, aluminum is preferred. In other words, an aluminum vapor-deposited film is preferred.

[0104] Examples of inorganic compounds constituting the above-mentioned deposited film include metal oxides such as aluminum oxide and silicon oxide, metal nitrides and metal carbides, indium tin oxide (ITO), and SiO2. X C Y Examples of complex inorganic compounds include those listed above. Among these, metal oxides are preferred.

[0105] Examples of metallic elements that make up inorganic compounds include aluminum (Al), silicon (Si), magnesium (Mg), calcium (Ca), potassium (K), tin (Sn), sodium (Na), boron (B), titanium (Ti), lead (Pb), zirconium (Zr), yttrium (Y), zinc (Zn), vanadium (V), barium (Ba), and chromium (Cr).

[0106] The average composition of inorganic compounds is, for example, AlO x SiO x SiO x C y For example, MO x or MO x C y This is expressed as follows: In the formula, M represents the metal element mentioned above, and the values ​​of x and y differ in range depending on the metal element.

[0107] Among metal oxides, aluminum oxide, silicon oxide, magnesium oxide, calcium oxide, boron oxide, titanium oxide, zirconium oxide, and barium oxide are preferred, with aluminum oxide and silicon oxide being more preferred.

[0108] The inorganic vapor deposition layer may be formed from one metal or inorganic compound, or from a combination of two or more metals or inorganic compounds. The inorganic vapor deposition layer may consist of a single layer, or it may consist of two or more layers of the same or different compositions. Furthermore, the inorganic vapor deposition layer may be combined with the organic coating layer described later.

[0109] When the inorganic vapor deposition layer is multilayered, each layer can be deposited to have high gas barrier properties, thus achieving even higher gas barrier properties than a single layer. Furthermore, if the composition of each layer is different in a multilayered inorganic vapor deposition layer, the inorganic vapor deposition layer becomes a discontinuous layer, allowing for more efficient suppression of the permeation of oxygen gas and water vapor.

[0110] When an inorganic vapor-deposited layer is laminated as the barrier layer 13, the thickness of the inorganic vapor-deposited layer is preferably 3 nm to 300 nm, more preferably 4 nm to 250 nm, and even more preferably 5 nm to 200 nm. The lower limit of the thickness of the inorganic vapor-deposited layer is preferably 3 nm or more, more preferably 4 nm or more, and even more preferably 5 nm or more. The upper limit of the thickness of the inorganic vapor-deposited layer is preferably 300 nm or less, more preferably 250 nm or less, and even more preferably 200 nm or less. If the thickness is above the lower limit, for example, sufficient oxygen barrier properties and water vapor barrier properties can be obtained. If the thickness is below the upper limit, for example, the occurrence of cracks in the inorganic vapor-deposited layer can be suppressed.

[0111] Furthermore, the barrier layer 13 may be an organic coating layer formed by applying a coating agent containing a water-soluble polymer such as polyvinyl alcohol. The organic coating layer is formed, for example, by applying a coating solution containing a water-soluble polymer and at least one of one of a metal alkoxide and its hydrolysate, or tin chloride, or an aqueous solution or water / alcohol mixed solution. These may be formed on the inorganic vapor-deposited layer described above.

[0112] The organic coating layer preferably contains at least one component selected from the group consisting of hydroxyl group-containing polymer compounds, metal alkoxides, metal alkoxide hydrolysates, and metal alkoxide polymers. Examples of water-soluble polymers used in the organic coating layer include polyvinyl alcohol, polyvinylpyrrolidone, and starch, but the barrier properties of the organic coating layer are best when polyvinyl alcohol is used.

[0113] Examples of metal alkoxides include tetramethoxysilane (Si(OCH3)4), tetraethoxysilane (Si(OC2H5)4), tetrapropoxysilane (Si(OC3H7)4), and tetrabutoxysilane (Si(OC4H9)4).

[0114] It is preferable to use a silane coupling agent together with the above-mentioned metal alkoxide. As the silane coupling agent, known organic reactive group-containing organoalkoxysilanes can be used, and organoalkoxysilanes having an epoxy group are preferred. Examples of organoalkoxysilanes having an epoxy group include γ-glycidoxypropyltrimethoxysilane, γ-glycidoxypropylmethyldiethoxysilane, and β-(3,4-epoxycyclohexyl)ethyltrimethoxysilane. It is preferable to use the silane coupling agent in an amount of 1 to 20 parts by mass per 100 parts by mass of the metal alkoxide. It is preferable to use the silane coupling agent in an amount of 1 part by mass or more per 100 parts by mass of the metal alkoxide. It is preferable to use the silane coupling agent in an amount of 20 parts by mass or less per 100 parts by mass of the metal alkoxide.

[0115] Preferred water-soluble polymers are polyvinyl alcohol and ethylene-vinyl alcohol copolymer. Depending on the desired physical properties such as oxygen barrier properties, water vapor barrier properties, water resistance, and weather resistance, either polyvinyl alcohol or ethylene-vinyl alcohol copolymer may be used, or both may be used in combination. Alternatively, a gas barrier coating film obtained using polyvinyl alcohol and a gas barrier coating film obtained using ethylene-vinyl alcohol copolymer may be laminated.

[0116] When an organic coating layer is laminated as the barrier layer 13, its thickness is preferably 3 nm to 2000 nm, more preferably 4 nm to 1500 nm, and even more preferably 5 nm to 1000 nm. The lower limit of the thickness of the organic coating layer is preferably 3 nm or more, more preferably 4 nm or more, and even more preferably 5 nm or more. The upper limit of the thickness of the organic coating layer is preferably 2000 nm or less, more preferably 1500 nm or less, and even more preferably 1000 nm or less. If the thickness is above the lower limit, for example, sufficient oxygen barrier properties and water vapor barrier properties can be obtained. If the thickness is below the upper limit, for example, the occurrence of cracks in the inorganic vapor-deposited layer can be suppressed.

[0117] <Protective layer 14> The barrier laminate 1(1A) of the present invention may further include a protective layer 14 on the surface of the barrier layer 13 opposite to the surface facing the heat seal layer 11. This can, for example, suppress damage to the barrier layer 13.

[0118] In one embodiment, the protective layer 14 contains a resin component. Examples of resin components include polyethylene resins, polypropylene resins, polystyrene resins, vinyl chloride resins, polyester resins, (meth)acrylic resins, urethane resins, melamine resins, and epoxy resins. Urethane resin is preferred as the resin component.

[0119] The thickness of the protective layer 14 is preferably 0.01 μm or more and 5 μm or less, more preferably 0.05 μm or more and 3 μm or less, and even more preferably 0.1 μm or more and 1 μm or less. The lower limit of the thickness of the protective layer 14 is preferably 0.01 μm or more, more preferably 0.05 μm or more, and even more preferably 0.1 μm or more. The lower limit of the thickness of the protective layer 14 is preferably 5 μm or less, more preferably 3 μm or less, and even more preferably 1 μm or less.

[0120] For example, if the barrier layer 13 is an inorganic vapor-deposited layer composed of metal oxides such as aluminum oxide and silicon oxide, the transfer film may include a barrier coat layer as a protective layer 14 on the barrier layer. This can, for example, further improve the gas barrier properties of the barrier laminate.

[0121] In one embodiment, the barrier coating layer contains a gas barrier resin. Examples of gas barrier resins include ethylene-vinyl alcohol copolymer, polyvinyl alcohol, poly(meth)acrylonitrile; polyamides such as nylon 6, nylon 6,6 and polymethaxylylene adipamide (MXD6); polyester; polyurethane; and (meth)acrylic resin.

[0122] In another embodiment, the barrier coat layer is a gas barrier coating film formed by polycondensation treatment of a composition containing a metal alkoxide and a water-soluble polymer using a sol-gel method in the presence of a sol-gel catalyst, water, and an organic solvent. By providing such a barrier coat layer on an inorganic vapor-deposited layer, the gas barrier properties can be improved.

[0123] As the composition for forming such a barrier coating layer, the same type of coating liquid used for forming the organic coating layer described above can be used.

[0124] The thickness of the gas barrier coating film is preferably 0.01 μm to 100 μm, more preferably 0.1 μm to 50 μm. The lower limit of the thickness of the gas barrier coating film is preferably 0.01 μm or more, more preferably 0.1 μm or more. The upper limit of the thickness of the gas barrier coating film is preferably 100 μm or less, more preferably 50 μm or less. This allows for further improvement of the gas barrier properties of the barrier laminate. If the thickness is above the lower limit, for example, the gas barrier properties of the barrier laminate can be further improved, and the occurrence of cracks in the inorganic vapor-deposited layer can be suppressed. If the thickness is below the upper limit, for example, a barrier laminate suitable for use in the manufacture of monomaterial packaging containers can be obtained.

[0125] <Applications of Barrier Laminate 1 (1A)> Compared to gas barrier plastic films, the barrier paper (barrier laminate 1) of this embodiment has a paper base material, resulting in a high paper content and a low plastic content. This contributes to reducing plastic waste, facilitates recycling and biodegradation, does not damage incinerators, and reduces incineration residue.

[0126] The oxygen permeability of the barrier laminate 1 such as barrier paper in this embodiment is not particularly limited, but is 10 cc / m². 2 Preferably less than 5cc / m 2 Less than 3cc / m 2 More preferably less than or equal to atm·day, and 2.5cc / m 2 A value of less than or equal to atm·day is particularly preferred. The lower limit of oxygen permeability is, for example, 0.01 cc / m³. 2 •atm•day is also acceptable. Oxygen permeability is measured in accordance with JIS K7126 under conditions of 23°C and 90%RH.

[0127] The water vapor permeability of the barrier laminate 1, such as barrier paper, in this embodiment is not particularly limited, but is 20 g / m². 2 • Preferably less than 10 g / m² 2 • Less than 5 g / m² is preferable. 2• More preferably less than 2.5 g / m² 2 • Days below this are particularly preferable. The lower limit of water vapor transmission is, for example, 0.01 g / m³. 2 • Day is also acceptable. Water vapor transmission is measured in accordance with JIS K7129 under conditions of 40°C and 90%RH.

[0128] In one embodiment, the barrier laminate 1 of the present invention can be suitably used as a packaging material such as a packaging bag. As described above, the barrier laminate of this embodiment has excellent interlayer adhesion and suppresses delamination, so the packaging material equipped with the barrier laminate has suppressed so-called delamination during use.

[0129] In one embodiment, the packaging material of the present invention comprises the barrier laminate 1 described above. The packaging material of the present invention may further comprise, if necessary, layers having various functions together with the barrier laminate 1.

[0130] For example, packaging material can be manufactured by folding the barrier laminate 1 in half so that the base material layer 2, such as a paper substrate, is on the outside and the heat-seal layer 11 is on the inside, overlapping the layers, and then heat-sealing the edges. Alternatively, packaging material can be manufactured by overlapping multiple barrier laminates 1 so that the heat-seal layers 11 face each other, and then heat-sealing the edges. The entire packaging material may be composed of the barrier laminate 1, or only a portion of the packaging material may be composed of the barrier laminate.

[0131] Examples of heat sealing forms for packaging materials include side seals, two-side seals, three-side seals, four-side seals, envelope seals, gusset seals (pillow seals), pleated seals, flat-bottom seals, square-bottom seals, and gusset seals. Stand-up pouches are also possible. Examples of heat sealing methods include bar seals, rotary roll seals, belt seals, impulse seals, high-frequency seals, and ultrasonic seals.

[0132] Examples of contents to be filled into the packaging material include liquids, powders, and gels, and may be food or non-food items. After filling the packaging material with contents, the opening of the packaging material is heat-sealed to obtain the package.

[0133] The contents specifically include coffee beans, tea leaves; cheese, snacks, rice crackers, fresh and semi-fresh confectionery, nuts, vegetables, fruits, fish and meat products, processed fish products, dried fish, smoked foods, preserved foods, raw rice, cooked rice dishes, mochi, baby food, jam, mayonnaise, ketchup, cooking oil, dressings, sauces, spices, dairy products, and pet food; beverages such as beer, wine, fruit juice, green tea, and coffee; pharmaceuticals; cosmetics, shampoo, conditioner, and detergents; and metal and electronic components.

[0134] <<Manufacturing Method for Barrier Laminate 1>> The barrier laminate 1 of the present invention can be obtained, for example, by the transfer method described below. The method for producing the barrier laminate 1 by the above transfer method is as follows: A step of preparing a transfer object such as a paper component having a paper base material and the transfer film 30 of the present invention (details will be described later) (hereinafter also referred to as the "preparation step"), The process involves bonding the object to be transferred and the transfer film 30 via an adhesive layer 3, with the support substrate 20 of the transfer film 30 facing outwards and the barrier layer 13 facing inwards (towards the object to be transferred), to obtain an intermediate laminate (hereinafter also referred to as the "bonding process"). The process includes a step of peeling the support substrate 20 from the heat seal layer 11 of the intermediate laminate (hereinafter also referred to as the "peeling step").

[0135] Through the above-described bonding and peeling processes, a transfer layer 10 comprising a barrier layer 13 and a heat seal layer 11 in that order in the thickness direction can be transferred onto a transfer target including a base material layer 2 such as a paper member. The barrier layer 13 transferred onto the base material layer 2 by the transfer method is less contaminated, has higher adhesion between the barrier layer 13 and the adhesive layer 3, is more homogeneous and stable, and has superior gas barrier properties compared to a barrier layer directly formed on the paper substrate.

[0136] The manufacturing method according to this embodiment allows for the provision of a barrier layer 13 on a paper substrate, similar to the case where a resin substrate is used, thereby enabling the production of barrier paper that has excellent gas barrier properties and is environmentally friendly.

[0137] Furthermore, in a method in which a barrier layer is formed on a paper substrate and a heat-seal layer is formed by applying a heat-seal coating liquid to the barrier layer, the gas barrier properties of the barrier layer may decrease due to cracks or thermal damage to the barrier layer caused by tension or drying during the formation of the heat-seal layer. The manufacturing method according to this embodiment can avoid such a decrease. In addition, the heat-seal layer 11 can suppress deterioration of the barrier layer during the application process and during the peeling process when the support substrate is peeled off.

[0138] In the manufacturing method according to this embodiment, the deterioration of the barrier layer can be suppressed, and therefore, for example, when a barrier laminate is used as a packaging material, the degree of deterioration due to bending, folding, and heat seal damage can be reduced.

[0139] It should be noted that a reference barrier paper (hereinafter also referred to as "reference barrier paper") with a different layer structure from the barrier paper according to this embodiment may also be considered, having a layer structure of paper substrate / adhesive layer / barrier layer / release layer / primer layer / heat seal layer if necessary.

[0140] One example of a method for manufacturing the reference barrier paper is to bond a paper substrate and a transfer film comprising a transfer substrate, a release layer, and a barrier layer via an adhesive layer to form a laminate (1) having a layer structure of paper substrate / adhesive layer / barrier layer / release layer / transfer substrate; peel off the transfer substrate from the laminate (1) to form a laminate (2) having a layer structure of paper substrate / adhesive layer / barrier layer / release layer; and optionally form a primer layer and a heat seal layer on the release layer of the laminate (2) to obtain the reference barrier paper. Hereinafter, this manufacturing method will also be referred to as the "reference transfer method".

[0141] The reference transfer method has several advantages over barrier layers directly formed on paper substrates: the barrier layer transferred by the transfer method is less contaminated, has better adhesion between the barrier layer and the adhesive layer, is more homogeneous and stable, and has superior gas barrier properties.

[0142] However, since the reference barrier paper has a release layer between the heat seal layer and the barrier layer, the adhesion strength between these layers may not be sufficient. In addition, in the reference transfer method, after peeling off the transfer substrate, it is necessary to separately form a heat seal layer (heat sealable sealant layer) on the release layer, for example, when manufacturing packaging materials, which increases the number of manufacturing steps.

[0143] In contrast, the barrier paper according to this embodiment does not have a release layer between the heat seal layer 11 and the barrier layer 13, so the adhesion strength between these layers is sufficiently high. Furthermore, in the manufacturing method according to this embodiment, the heat seal layer 11 also serves as a release layer from the support substrate 20, and there is no need to separately form a heat seal layer (heat sealable sealant layer) after peeling off the support substrate 20, thus reducing the number of manufacturing steps.

[0144] Furthermore, in the manufacturing method according to this embodiment, in one embodiment, the heat seal layer 11 and the barrier layer 13 are pre-formed on the thin film support substrate 20. In the manufacturing of the transfer film 30, processing is possible in a wider and longer form than with a paper substrate, thus reducing the cost per unit area of ​​the barrier paper.

[0145] Thus, while both the reference barrier paper and the reference transfer method have excellent advantages, the barrier paper and its manufacturing method according to this embodiment are even superior in the points mentioned above and can be said to produce advantageous effects.

[0146] <Preparation process> In the preparation step, the object to be transferred, such as a paper component containing the base material layer 2, and the transfer film 30 are prepared. The paper component comprises a paper base material. The paper component may be a single sheet or a continuous sheet wound into a roll. The paper member may consist only of a paper substrate, or it may consist of a paper substrate and a printed layer 4 provided on the paper substrate. Preferably, the printed layer is provided on the side of the paper substrate opposite to the side on which the adhesive layer 3 is provided. In the preparation step, the paper member may be manufactured by forming the printed layer 4 on the paper substrate, or a paper member with the printed layer 4 already provided on the substrate layer 2 may be used. The printed layer may be formed between the bonding step and the peeling step, or after the peeling step, but from the viewpoint of suppressing a decrease in gas barrier properties, it is preferable to form the printed layer 4 before the bonding step.

[0147] The paper substrate may consist only of paper material, or it may consist of paper material and a sealing layer or resin layer formed on the paper material. By using a paper substrate with a sealing layer or resin layer on the paper material, the penetration of the adhesive into the paper material can be suppressed, and the adhesive strength of the adhesive layer can be stabilized. In the preparation step, the paper substrate may be made by forming the sealing layer or resin layer on the paper material, or a paper substrate that already has a sealing layer or resin layer on it, such as coated paper, may be used. In addition to forming the printed layer 4 described above, the paper substrate may be decorated on the side opposite to the side where the adhesive layer 3 is provided, for example, by foil stamping, embossing, and shaping. The paper member obtained in this way may be used. Decoration may be performed between the bonding process and the peeling process, or after the peeling process, but from the viewpoint of suppressing a decrease in gas barrier properties, it is preferable to perform the decoration before the bonding process.

[0148] Details of each element are as described above and will be omitted here. As the transfer target, the resin film described above may be used as the support substrate 20. Other substrates that are difficult to directly vapor-deposit (for example, wood) may also be used. In the preparation step, the transfer film according to this embodiment, which has been manufactured in advance, is prepared.

[0149] <Pasting process> In the bonding process, the transfer object, such as a paper member, and the transfer film 30 are bonded together via an adhesive layer 3, with the support substrate 20 of the transfer film 30 facing outwards and the barrier layer 13 (protective layer 14) facing inwards (towards the transfer object), to obtain an intermediate laminate. In one embodiment, by providing an adhesive layer 3 between the substrate layer 2 and the barrier layer 13 (protective layer 14), the barrier layer 13 can be stably bonded even if the surface of the paper substrate is rough.

[0150] In the bonding process, the adhesive layer 3 may be formed on either the transfer object or the transfer film 30, or on both. Adhesive may also be supplied between the transfer object and the transfer film to simultaneously form the adhesive layer 3 and bond the transfer object and the transfer film. In one embodiment, in the bonding process, the adhesive layer 3 is formed on the transfer object, and the transfer film is bonded to the adhesive layer 3. In one embodiment, it is preferable to form the adhesive layer 3 on the sealing layer or resin layer of the paper member.

[0151] In the application process, in one embodiment, an adhesive layer 3 is formed on the transfer film, and the object to be transferred is bonded to the adhesive layer 3. The adhesive layer 3 is formed on the side of the transfer film 30 opposite to the support substrate 20. In one embodiment, it is preferable to form the adhesive layer 3 on the barrier layer 13 of the transfer film 30. In the bonding process, in one embodiment, an adhesive layer 3 is formed on the object to be transferred, an adhesive layer 3 is formed on the transfer film 30, and the object to be transferred and the transfer film 30 are bonded together so that their adhesive layers 3 are in contact.

[0152] Specific methods for forming the adhesive layer 3 include, for example, a method of forming a coating layer by applying a liquid adhesive composition, a dry lamination method using a dry laminating adhesive, a non-solvent lamination method using a non-solvent adhesive, and a wet lamination method using a wet laminating adhesive.

[0153] Prior to forming the adhesive layer 3, the anchor coat layer 12 may be formed before forming the adhesive layer 3 to improve the adhesion of the adhesive layer. The anchor coat agent is preferably formed by coating and drying.

[0154] The bonding process can be carried out using generally known equipment, temperature, and pressure, depending on the type and characteristics of the adhesive and the method of forming the adhesive layer 3. For example, when forming the adhesive layer 3 by a dry lamination method, in one embodiment, a dry lamination adhesive is applied to the transfer object and / or transfer film to form the adhesive layer 3, the transfer object and the transfer film are overlapped via the adhesive layer 3, and then pressurized to obtain an intermediate laminate. Heating may be used as needed.

[0155] The method and pressure of pressing the intermediate laminate during the bonding process should preferably be selected and set in a way that minimizes damage to the barrier layer 13. The pressure during pressing is preferably between 0.1 MPa and 10 MPa. The lower limit of the pressure during pressing is preferably 0.1 MPa or higher. The upper limit of the pressure during pressing is preferably 10 MPa or lower. For example, the adhesive layer 3 may be softened by heating before bonding. Depending on the composition of the adhesive, the adhesive layer may be cured by heating after bonding.

[0156] <Peeling process> In the peeling process, the support substrate 20 is peeled from the heat-seal layer 11 of the intermediate laminate. For example, after sufficient adhesive strength has been achieved by the adhesive layer 3 between the object to be transferred and the transfer film, the support substrate 20 is peeled from the intermediate laminate. Peeling can be performed using known equipment and temperatures, depending on the type and characteristics of the adhesive layer 3 and the method of forming the adhesive layer 3. In one embodiment, the support substrate 20 of the transfer film 30 may be peeled off while the transfer object and the transfer film 30 are bonded together via the adhesive layer 3. In this way, a barrier laminate 1 such as barrier paper according to this embodiment is obtained. For example, if the intermediate laminate is a continuous sheet wound in a roll shape, a release roll may be used to continuously peel the support substrate 20 from the heat seal layer 11 of the intermediate laminate, and the barrier laminate 1 and the support substrate 20 may be wound up separately.

[0157] In this case, if the heat seal layer is composed of two layers, a first heat seal layer 11a and a second heat seal layer 11b, a barrier laminate 1 having a two-layer heat seal layer can be manufactured by going through the above-described process using a transfer film 30 having a support substrate 20, a second heat seal layer 11b, a first heat seal layer 11a, and a barrier layer 13 arranged in this order in the thickness direction. Alternatively, a barrier laminate can be manufactured using a transfer film in which only the first heat seal layer 11a is formed and the second heat seal layer 11b is not formed. Specifically, in the preparation step described above, a transfer film is prepared in which a support substrate 20, the first heat seal layer 11a, and the barrier layer 13 are arranged in this order in the thickness direction. Then, in the bonding step described above, the object to be transferred, such as a paper member, and the transfer film are bonded together via the adhesive layer 3 with the support substrate 20 of the transfer film facing outwards and the barrier layer 13 (protective layer 14) facing inwards (towards the object to be transferred) to obtain an intermediate laminate. Then, in the peeling step described above, the support substrate 20 is peeled off from the intermediate laminate to expose the first heat seal layer 11a. A coating liquid for the second heat seal layer is applied to the surface of the exposed first heat seal layer 11a and dried to form the second heat seal layer 11b (second heat seal layer formation step). This makes it possible to manufacture a barrier laminate 1 having a first heat seal layer 11a and a second heat seal layer 11b as shown in Figure 1. Examples of known coating methods for the second heat seal layer include gravure coating, reverse coating, air knife coating, comma coating, die coating, blade coating, roll coating, bar coating, curtain coating, spray coating, lip coating, and dipping. Methods for drying the applied heat-seal coating liquid include, for example, hot air drying, hot roll drying, and methods involving the application of heat such as infrared irradiation. The drying temperature is preferably 50°C to 150°C. The lower limit of the drying temperature is preferably 50°C or higher. The upper limit of the drying temperature is preferably 150°C or lower.

[0158] <<Other embodiments of barrier laminates>> Figure 2 is a laminate configuration diagram showing another example of the layer configuration of barrier laminate 1 (1B). In the description of Figure 2 and the barrier laminate 1B shown in Figure 2, the same reference numerals are used for components equivalent to those of barrier laminate 1A shown in Figure 1, and redundant explanations are omitted. The barrier laminate 1B shown in Figure 2 differs from the barrier laminate 1A shown in Figure 1 in that a surface heat seal layer 5 is provided on the printed layer 4 of the barrier laminate 1A shown in Figure 1.

[0159] The surface heat seal layer 5 is constructed in the same manner as the second heat seal layer 11b provided on the heat seal layer 11 described above. That is, the exposed surface of the surface heat seal layer has a dynamic friction coefficient of less than 0.7 against the SUS plate as determined by the following test method, and the heat seal layers are subjected to 120°C × 0.5 seconds and 1 kgf / cm². 2 The sealing strength at N pressure is 1.8 N / 15 mm width or more.

[0160] Similar to the barrier laminate 1A described above, the barrier laminate 1B according to this embodiment is provided with a sliding second heat seal layer 11b, so when used as a packaging material, it is possible to easily fill and remove contents from packaging bags, etc.

[0161] Furthermore, when the barrier laminate 1B is used as a packaging material, and the second heat seal layer 11b is placed on the inside to wrap the object to be packaged, the second heat seal layer 11b and the surface heat seal layer 5 can be joined at the edges of the packaging material (see Figure 6(b)).

[0162] Furthermore, since a surface heat seal layer 5 is provided on the surface of the printed layer 4, it protects the printed layer 4 provided on the barrier laminate 1B and also provides slipperiness to the surface of the barrier laminate 1B, thereby further suppressing defects such as sticking that may occur during the manufacturing process of the barrier laminate 1B.

[0163] The static friction coefficient, dynamic friction coefficient, surface roughness Ra, and friction coefficient between the exposed surface heat seal layer 5 and the SUS plate, as well as the friction coefficient between the surface heat seal layers 5 at 120°C for 0.5 seconds and 1 kgf / cm², are all determined. 2 The seal strength at pressure can be controlled by adjusting the components of the coating agent (e.g., lubricant and resin components) used to form the surface heat seal layer 5.

[0164] <<Further Embodiments of Barrier Laminates>> Figure 3 is a diagram showing another example of the layer configuration of barrier laminate 1(1C). In the description of Figure 3 and the barrier laminate 1C shown in Figure 3, the same reference numerals are used for components equivalent to those in barrier laminate 1A shown in Figure 1, and redundant explanations are omitted. The barrier laminate 1C shown in Figure 3 differs from the barrier laminate 1A shown in Figure 1 in that the heat seal layer 11 of the barrier laminate 1A shown in Figure 1 is composed of only one layer (heat seal layer 11c in Figure 3).

[0165] The heat seal layer 11c is constructed in the same manner as the second heat seal layer 11b shown in Figure 1 above. That is, the exposed surface on the sealing side of the heat seal layer 11c has a dynamic friction coefficient against the SUS plate of less than 0.7 according to the following test method, and the heat seal layers are heated to 120°C for 0.5 seconds at 1 kgf / cm². 2 The sealing strength at this pressure is 1.8 N / 15 mm width or more.

[0166] Similar to the barrier laminate 1A described above, the barrier laminate 1C of this embodiment is provided with a slippery heat-seal layer 11c, so when used as a packaging material, it is possible to easily fill and remove contents from packaging bags, etc.

[0167] Furthermore, since the barrier laminate 1C allows for a simpler layer configuration of the heat seal layer compared to the embodiments shown in Figures 1 and 2, the manufacturing process and cost of the transfer film can be reduced.

[0168] The preferred static friction coefficient, preferred dynamic friction coefficient, preferred surface roughness Ra, and the friction coefficient between the exposed surface of the heat seal layer 11c on the sealing side of the SUS plate, as well as the friction coefficient between the heat seal layers 11c at 120°C for 0.5 seconds and 1 kgf / cm². 2 The preferred seal strength at the pressure is the same as in the previously described embodiment.

[0169] In the above description, the barrier laminate 1C was described in an example where the heat seal layer 11c is configured in the same way as the second heat seal layer 11b shown in Figure 1. However, it is not limited to this, and for example, it may be configured in the same way as the first heat seal layer 11a. In this case, by providing a fine uneven shape on the heat seal layer 11c side of the support substrate 20 of the transfer film 30 to a predetermined surface roughness, the surface roughness Ra of the exposed surface can be set to a desired roughness by transferring the fine uneven shape to the sealing surface side of the heat seal layer 11c.

[0170] <<Layer structure of transfer film 30>> Figure 4 is a laminated diagram showing an example of the layer structure of a transfer film. The transfer film 30 according to this embodiment comprises a support substrate 20, a heat seal layer 11, and a barrier layer 13 in this order in the thickness direction. The transfer film 30 may further include an anchor coat layer 12 between the heat seal layer 11 and the barrier layer 13. The transfer film 30 may also further include a protective layer 14 on the side of the barrier layer 13 opposite to the heat seal layer 11.

[0171] Of the layers of the transfer film 30, the layers excluding the support substrate 20, namely the heat seal layer 11, anchor coat layer 12, barrier layer 13, and protective layer 14, constitute the transfer layer 10. That is, the transfer film 30 of this embodiment comprises a support substrate 20 and a transfer layer 10 provided on the support substrate 20, and the transfer layer 10 comprises the heat seal layer 11 and the barrier layer 13 in this order in the thickness direction. In one embodiment, the transfer layer 10 may further include an anchor coat layer 12 between the heat seal layer 11 and the barrier layer 13. Also, the transfer layer 10 may further include a protective layer 14 on the side of the barrier layer 13 opposite to the heat seal layer 11. The heat seal layer 11 is in contact with the support substrate 20 and is provided so as to be peelable from the support substrate 20.

[0172] In this case, in the transfer layer 10, the barrier layer 13 and the heat seal layer 11 (or the anchor coat layer 12 if an anchor coat layer 12 is provided) are in contact, or the transfer layer 10 does not have a release layer between the barrier layer 13 and the heat seal layer 11.

[0173] In one embodiment, the transfer film 30 includes a protective layer 14 on the barrier layer 13. In one embodiment, if the barrier layer 13 is an inorganic vapor-deposited layer composed of metal oxides such as aluminum oxide and silicon oxide, the transfer film 30 may also include an organic coating layer formed by applying a coating agent containing a water-soluble polymer such as polyvinyl alcohol to the barrier layer 13. The support substrate 20 as the transfer substrate, and therefore the transfer film 30, may be a single-sheet film or a continuous film wound in a roll.

[0174] <Support base material 20> The transfer film 30 according to this embodiment includes a support substrate 20 as a transfer substrate. The support substrate 20 is preferably a film made of resin (hereinafter also referred to as "resin film"). Examples of the resin include polyester resins such as polyethylene terephthalate (PET) and polybutylene terephthalate (PBT); polyamide resins such as various nylons, especially aromatic polyamides such as nylon MXD6; vinyl resins such as ethylene-vinyl acetate copolymer, ethylene-vinyl alcohol copolymer, and polyvinyl alcohol; polyolefin resins such as polyethylene resin, polypropylene resin, polybutene resin, and cyclic polyolefin; styrene resins such as styrene homopolymer, acrylonitrile-styrene copolymer (AS resin), and acrylonitrile-butadiene-styrene copolymer (ABS resin); (meth)acrylic resin, polycarbonate, polyimide resin, diarylphthalate resin, silicone resin, polysulfone resin, polyphenylene sulfide resin, polyethersulfone resin, polyurethane resin, cellulose resin, and fluororesin.

[0175] The resin film may consist of a single layer, or it may consist of two or more layers of the same or different compositions. The resin film may be an unstretched film, or a stretched film such as a uniaxially oriented film or a biaxially oriented film, but from the viewpoint of recyclability, it is desirable that it be composed of a single layer of the same composition.

[0176] The thickness of the support substrate 20 is preferably 3 μm or more and 200 μm or less, more preferably 5 μm or more and 100 μm or less, and even more preferably 6 μm or more and 80 μm or less. The lower limit of the thickness of the support substrate 20 is preferably 3 μm or more, more preferably 5 μm or more, and even more preferably 6 μm or more. The upper limit of the thickness of the support substrate 20 is preferably 200 μm or less, more preferably 100 μm or less, and even more preferably 80 μm or less.

[0177] Preferably, the support substrate 20 has the property of being able to form a heat seal layer 11 on the substrate and being able to be easily peeled off the substrate from the heat seal layer 11 in the peeling process. From this viewpoint, among resin films, films containing polyester resins and films containing polyamide resins are preferred, films containing polyester resins are more preferred, and films containing polyethylene terephthalate are even more preferred.

[0178] The support substrate 20 has excellent mechanical, physical, and chemical properties that can withstand the barrier layer formation process of the barrier layer 13, and it is particularly preferable that it has strength and heat resistance. Polyethylene terephthalate film is also preferable from this viewpoint.

[0179] Preferably, the resin film does not have a known easy-adhesion treatment applied to the surface in contact with the heat-seal layer 11, and it is also preferable that the surface in contact with the heat-seal layer 11 does not have a known easy-adhesion layer. With such a configuration, for example, the peelability between the support substrate 20 and the heat-seal layer 11 in the peeling process can be improved.

[0180] Furthermore, the surface of the support substrate 20 that contacts the heat seal layer 11 may be provided with a fine uneven surface to achieve a predetermined surface roughness (for example, Ra of 0.5 μm or more and 10 μm or less). This allows the fine uneven surface corresponding to the fine uneven surface of the support substrate 20 to be transferred and formed on the exposed surface of the heat seal layer 11 on the sealing side, making it possible to achieve a desired surface roughness on the exposed surface of the heat seal layer 11 on the sealing side.

[0181] <Heat seal layer 11> The transfer film 30 according to this embodiment includes a heat seal layer 11 as a surface layer on one side. In one embodiment, the heat seal layer 11 functions as a heat seal layer. For example, when the barrier laminate 1 is used as a packaging material, the heat seal layer 11 functions as a heat sealable sealant layer. Furthermore, when the barrier laminate is manufactured by the transfer method described above, the heat seal layer also functions as a release layer from the support substrate 20. Details of the heat seal layer 11 are as described above and will not be explained further in this section.

[0182] <Anchor coat layer 12> The transfer film 30 according to this embodiment may further include an anchor coat layer 12 between the heat seal layer 11 and the barrier layer 13. By providing the anchor coat layer 12, the adhesion between the heat seal layer 11 and the barrier layer 13 can be improved, and the occurrence of delamination between these layers can be suppressed. The anchor coat layer 12, for example, is in contact with the barrier layer 13 on one side and in contact with the heat seal layer 11 on the other side. Details of the anchor coat layer 12 are as described above and will not be explained further in this section.

[0183] <Barrier layer 13> The transfer film 30 according to this embodiment includes a barrier layer 13. Preferably, the barrier layer 13 is a layer directly formed on one side of the heat seal layer 11, or, if an anchor coat layer 12 is provided, on one side of the anchor coat layer 12. Details of the barrier layer 13 are as described above and will not be explained further in this section.

[0184] <Protective layer 14> The transfer film 30 of the present invention may include a protective layer 14 on the surface of the barrier layer 13 opposite to the surface facing the heat seal layer 11. This can, for example, suppress damage to the barrier layer 13. Details of the protective layer 14 are as described above and will not be explained further in this section.

[0185] [Method for manufacturing the transfer film 30] The method for manufacturing the transfer film 30 of the present invention may include the steps of forming a heat seal layer 11 on a support substrate 20 (hereinafter also referred to as the "heat seal layer formation step"), forming an anchor coat layer 12 on the heat seal layer 11 as needed (hereinafter also referred to as the "anchor coat layer formation step"), and forming a barrier layer 13 on the heat seal layer 11 or the anchor coat layer 12 (hereinafter also referred to as the "barrier layer formation step"). The above manufacturing method may also include the step of forming a protective layer 14 on the barrier layer 13 (hereinafter also referred to as the "protective layer formation step").

[0186] <Heat seal layer formation process> The heat seal layer 11 can be formed, for example, by applying a heat seal coating liquid to one surface of the support substrate 20 and drying it. It is preferable to provide the heat seal layer 11 on a surface of the support substrate 20 that has not been treated for easy adhesion, or on a surface where an easy adhesion layer has not been formed.

[0187] As the coating liquid for the heat seal layer, it is preferable to have a coating liquid that can form a coating film on the support substrate 20 and that can form a coating film that has excellent peelability from the support substrate 20 as well as heat sealability. Details of the coating liquid for the heat seal layer are as described above.

[0188] In one embodiment, a coating liquid for the heat seal layer is applied to the support substrate 20 and dried. Examples of known coating methods for the heat seal layer coating liquid include gravure coating, reverse coating, air knife coating, comma coating, die coating, blade coating, roll coating, bar coating, curtain coating, spray coating, lip coating, and dipping.

[0189] Methods for drying the applied heat-seal coating liquid include, for example, hot air drying, hot roll drying, and methods involving the application of heat such as infrared irradiation. The drying temperature is preferably 50°C to 150°C. The lower limit of the drying temperature is preferably 50°C or higher. The upper limit of the drying temperature is preferably 150°C or lower.

[0190] Furthermore, if the heat seal layer 11 has a two-layer structure consisting of a first heat seal layer 11a and a second heat seal layer 11b, the coating liquid for the second heat seal layer is applied to the support substrate 20 and dried to form the second heat seal layer 11b, and then the coating liquid for the first heat seal layer is applied to the second heat seal layer 11b and dried to form the first heat seal layer 11a. The same applies even if the heat seal layer 11 has a structure of three or more layers.

[0191] <Anchor coat layer formation process> The anchor coat layer 12 can be formed, for example, by applying a coating liquid for the anchor coat layer to the surface of the heat seal layer 11 and drying it. By providing the anchor coat layer 12 on the heat seal layer 11, the adhesion of the barrier layer 13 can be improved and the surface of the barrier layer can be smoothed. Depending on the required degree of gas barrier properties and the required interlayer strength, the anchor coat layer 12 may not be provided.

[0192] An anchor coating agent for forming an anchor coating layer can be prepared, for example, by mixing the above-mentioned resin component or its precursor resin (e.g., thermosetting resin), a curing agent as needed, an additive as needed, and a solvent. Details of these components are as described above, and the solvent can be the same as the solvent used for the coating liquid for the heat seal layer.

[0193] The anchor coat layer 12 can be formed, for example, by applying a coating liquid for the anchor coat layer onto the heat seal layer 11 and drying it. The known application methods described above are examples of methods for applying the coating liquid for the anchor coat layer. Methods for drying the applied coating liquid for the anchor coat layer include, for example, applying heat such as hot air drying, hot roll drying, and infrared irradiation. The drying temperature is preferably 50°C to 150°C. The lower limit of the drying temperature is preferably 50°C or higher. The upper limit of the drying temperature is preferably 150°C or lower.

[0194] <Barrier layer formation process> The barrier layer 13 can be formed, for example, by depositing an inorganic material onto the surface of the anchor coat layer 12, or by applying a coating agent and drying it. Preferably, the barrier layer 13 is a layer formed directly on one side of the heat seal layer 11 or the anchor coat layer 12. Details of the barrier layer 13 are as described above and will not be explained further in this section.

[0195] When stacking inorganic vapor-deposited layers formed by depositing inorganic materials as a barrier layer, methods for forming the inorganic vapor-deposited layers include, for example, physical vapor deposition (PVD) methods such as vacuum deposition, sputtering, ion plating, and cluster ion beam deposition, and chemical vapor deposition (CVD) methods such as plasma chemical vapor deposition, thermochemical vapor deposition, and photochemical vapor deposition. The inorganic vapor-deposited film may also be a composite film comprising two or more different layers formed by using both physical vapor deposition and chemical vapor deposition methods in combination. Examples of heating means include resistance heating, induction heating, and electron beam heating.

[0196] The gas pressure in the deposition chamber is 10 -8 mbar or more (10) -2 mbar or less (10 -3 A pressure of mPa or more and 1.0 Pa or less is preferred. The lower limit of the gas pressure in the deposition chamber is 10 -8 mbar or more (10 -3 mPa or higher is preferred. The upper limit of the gas pressure in the deposition chamber is 10 -2 A pressure of mbar or less (1.0 Pa or less) is preferred. When forming a barrier layer 13 composed of an inorganic compound, for example, oxygen gas, nitrogen gas, or carbon dioxide gas is introduced as a reaction gas. When forming a barrier layer 13 composed of a metal oxide, the gas pressure after introducing oxygen gas is 10 -6 mbar or more (10) -1 mbar or less (10 -1mPa or more and 10.0 Pa or less is preferred. The lower limit of the above gas pressure is 10 after the introduction of oxygen gas. -6 mbar or more (10 -1 (mPa or higher) is preferred. The upper limit of the above gas pressure is 10 mPa after the introduction of oxygen gas. -1 A value of mbar or less (10.0 Pa or less) is preferable.

[0197] The amount of reaction gas introduced varies depending on the size of the deposition machine, etc. Inert gases such as argon, helium, and nitrogen may be used as carrier gases for the reaction gases, such as oxygen, to the extent that they do not cause problems.

[0198] When a roll-shaped transfer substrate is used and an inorganic vapor deposition layer is formed continuously, the transport speed of the transfer substrate on which the heat seal layer 11 and optionally the anchor coat layer 12 are formed is, for example, 10 m / min or more and 1000 m / min or less. The lower limit of the transport speed of the transfer substrate on which the heat seal layer 11 and optionally the anchor coat layer 12 are formed is, for example, 10 m / min or more. The upper limit of the transport speed of the transfer substrate on which the heat seal layer 11 and optionally the anchor coat layer 12 are formed is, for example, 1000 m / min or less.

[0199] During the formation of the inorganic vapor-deposited layer, pretreatment using Ar gas, O2, or N2 can be used to clean the surface of the layer on which the inorganic vapor-deposited layer will be deposited, thereby generating polar groups or free radicals on the surface of the layer and improving the adhesion between the inorganic vapor-deposited layer and the layer.

[0200] In one embodiment, the PVD method uses, for example, a winding type deposition machine, where a substrate unwound from an unwinding roll is placed in a deposition chamber, where a deposition source heated in a crucible is evaporated, and an inorganic deposition layer is formed on the substrate on a cooled coating drum while blowing oxygen gas or the like from an oxygen gas outlet as needed, and then the substrate is wound onto a winding roll.

[0201] In one embodiment, the PE-CVD method involves introducing a mixed gas containing, for example, an organosilicon compound as a monomer gas, oxygen gas, and an inert gas into a deposition chamber, generating a plasma, and thereby forming an inorganic deposition layer composed of silicon oxide or the like on a substrate.

[0202] When laminating an organic coating layer formed by applying a coating agent containing a water-soluble polymer as a barrier layer, the coating agent (composition) for forming the organic coating layer can be prepared, for example, by mixing a water-soluble polymer with an aqueous solution or water / alcohol mixture containing at least one of one of the following: one or more metal alkoxides and hydrolysates, or tin chloride.

[0203] First, a metal alkoxide, a water-soluble polymer, a sol-gel catalyst, water, an organic solvent, and optionally a silane coupling agent are mixed to prepare a composition. A polycondensation reaction gradually proceeds within this composition.

[0204] Next, the composition is applied to the anchor coat layer 12 using the known application method described above and dried. This drying further promotes the polycondensation reaction between the metal alkoxide and the water-soluble polymer (and the silane coupling agent if the composition contains one), forming a composite polymer layer.

[0205] Next, the above composition is heated, preferably at a temperature of 20°C to 250°C, more preferably at 50°C to 220°C, for a period of 1 second to 10 minutes. This allows an organic coating layer to be formed.

[0206] The above substrate comprises a transfer substrate, a heat seal layer 11, and optionally an anchor coat layer 12. In this way, a transfer film is obtained having the transfer substrate, the heat seal layer 11, optionally an anchor coat layer 12, and a barrier layer 13 in this order in the thickness direction.

[0207] <Protective layer formation process> The protective layer 14 can be formed, for example, by applying a protective coating liquid onto the barrier layer 13 and drying it. The known application methods described above are examples of how the protective coating liquid can be applied. Methods for drying the applied protective coating liquid include, for example, applying heat such as hot air drying, hot roll drying, and infrared irradiation. The drying temperature is preferably 50°C to 200°C. The lower limit of the drying temperature is preferably 50°C or higher. The upper limit of the drying temperature is preferably 200°C or lower.

[0208] The protective layer coating liquid can be prepared, for example, by mixing the resin components described above with a curing agent as needed, an additive as needed, and a solvent. The details of these components are as described above, and the solvent can be the same as the solvent used for the heat seal layer coating liquid.

[0209] The barrier coat layer, which serves as the protective layer 14, can be formed, for example, by dissolving or dispersing a material such as a gas barrier resin in water or a suitable organic solvent, and then applying and drying the resulting coating solution onto the inorganic vapor-deposited layer. The barrier coat layer can also be formed, for example, by applying and drying a commercially available barrier coat agent.

[0210] In one embodiment, the barrier coating layer is the gas barrier coating film described above. The gas barrier coating film can be formed, for example, in the same manner as the organic coating layer described above.

[0211] <<Packaging 100 using barrier laminate 1A>> Next, we will describe a package 100 in which the contents P are packaged using the barrier laminate 1A (see Figure 1) described above.

[0212] Figure 5 shows one embodiment of a packaging body formed using a barrier laminate. Figure 5(a) shows a perspective view of the packaging body formed using a barrier laminate, and Figure 5(b) shows a cross-section of bb in Figure 5(a).

[0213] As shown in Figure 5, the packaging 100 comprises a top surface 101, a bottom surface 102, a right side surface 103, a left side surface 104, a front side surface 105, and a rear side surface 106, and is a rectangular parallelepiped-shaped packaging in which a rectangular barrier laminate 1A encloses a rectangular parallelepiped-shaped contents P.

[0214] The top surface 101, bottom surface 102, right side surface 103, and left side surface 104 of the packaging body 100 are formed by enclosing the side surfaces of the rectangular parallelepiped contents P with the heat-seal layer 11 of the rectangular barrier laminate 1A facing inwards.

[0215] Here, the edges of the barrier laminate 1A that are substantially parallel to the side surface of the contents P are heat-sealed by facing each other with the heat-seal layers 11 of one edge and the other edge, i.e., the inner surfaces of the barrier laminate 1A, as shown in Figure 5(b), and a seal portion 110 is formed on the upper surface 101. In addition, the edges of the barrier laminate 1A that are substantially perpendicular to the side surface of the contents P are folded and sealed as appropriate to form the front surface 105 and the rear surface 106.

[0216] The sealing portion 110 may be joined to the upper surface 101 as needed. In addition, although the above description describes an example in which the contents P are packaged using a barrier laminate 1A to form the packaging 100, the packaging 100 may also be formed using a barrier laminate 1C as shown in Figure 3.

[0217] <<Packaging 200 using barrier laminate 1B>> Next, we will describe the packaging 200 in which the contents P are packaged using the barrier laminate 1B (see Figure 2) described above.

[0218] Figure 6 shows one embodiment of a packaging body formed using a barrier laminate. Figure 6(a) shows a perspective view of the packaging body formed using a barrier laminate, and Figure 6(b) shows a cross-section of bb in Figure 6(a).

[0219] As shown in Figure 6, the packaging body 200 comprises a top surface 201, a bottom surface 202, a right side surface 203, a left side surface 204, a front side surface 205, and a rear side surface 206, and is a rectangular parallelepiped-shaped packaging body in which a rectangular barrier laminate 1C encloses a rectangular parallelepiped-shaped contents P.

[0220] As shown in Figure 6, the heat-seal layer 11 of the rectangular barrier laminate 1B becomes the inner surface and the surface heat-seal layer 5 becomes the outer surface, and by enclosing the side circumferential surface of the rectangular parallelepiped contents P, the top surface 201, bottom surface 202, right side surface 203, and left side surface 204 of the packaging body 200 are formed.

[0221] Here, the edges of the barrier laminate 1B, which are substantially parallel to the side surface of the contents P, are overlapped and heat-sealed, as shown in Figure 6(b), so that the heat-seal layer 11 of one edge and the surface heat-seal layer 5 of the other edge face each other, and a seal portion 210 is formed on the upper surface 201. In addition, the edges of the barrier laminate 1A, which are substantially perpendicular to the side surface of the contents P, are folded and sealed as appropriate to form the front side surface 205 and the rear side surface 206.

[0222] The packaging shown in Figures 5 and 6 is formed by using a bag-making device to create a barrier laminate in a bag shape while simultaneously sealing in the contents. In this process, the barrier laminate is formed into a bag shape as the sealing surface of the heat-seal layer slides and moves on a metal plate provided in the bag-making apparatus. Therefore, if the sealing surface of the heat-seal layer of the barrier laminate is not provided with sliding properties, the coefficient of dynamic friction between the sealing surface of the heat-seal layer and the metal plate of the bag-making apparatus will increase, resulting in tensile resistance between the heat-seal layer and the metal plate during transport. This can lead to problems such as the barrier laminate breaking, the heat-seal position of the formed bag shifting, or wrinkles appearing in parts of the bag. Therefore, since the barrier laminate of the present invention has slipperiness in the heat seal layer as described above, the above-mentioned problems can be significantly suppressed. If slipperiness is not imparted to the sealing surface of the heat seal layer, the coefficient of static friction between the sealing surface of the heat seal layer and the metal plate of the bag making apparatus increases, which causes a problem of increased resistance when unrolling the barrier laminate from the raw fabric. However, this is only a problem that occurs for the first moment when unrolling the paper barrier laminate, and it is more important to control the coefficient of kinetic friction which greatly affects the performance of the product. [Examples]

[0223] Hereinafter, the present invention will be described in further detail with reference to Examples, but the present invention is not limited in any way by these descriptions.

[0224] [Example 1: Production of transfer film 1] The following coating liquid 1 for a heat seal layer was applied by gravure coating to the non-corona-treated surface of a PET film (manufactured by Toyobo Co., Ltd., thickness 12 µm, one-side corona-treated product, corresponding to the support base material 20 in Fig. 4) and dried to form a heat seal layer with a thickness of 2 µm (corresponding to the second heat seal layer 11b in Fig. 4).

[0225] Then, the following coating liquid 2 for a heat seal layer was applied by gravure coating to the surface of the heat seal layer corresponding to the second heat seal layer 11b in Fig. 4 and dried to form a heat seal layer with a thickness of 3 µm (corresponding to the first heat seal layer 11a in Fig. 4).

[0226] Next, a coating liquid for an anchor coat layer was prepared by mixing polyester as a main agent (manufactured by Toyobo Co., Ltd., trade name: Byron (registered trademark) UR1700), XDI-based isocyanate as a curing agent (manufactured by Mitsui Chemicals, Inc., trade name: Takenate D110N), and nitrocellulose as an additive at a solid content mass ratio of main agent:curing agent:nitrocellulose = 1:1:1. Then, the coating liquid for an anchor coat layer was applied by gravure coating onto the heat seal layer corresponding to the first heat seal layer 11a in Fig. 4 and dried to form an anchor coat layer with a thickness of 500 nm (corresponding to the anchor coat layer 12 in Fig. 4).

[0227] Then, on the anchor coat layer corresponding to the anchor coat layer 12 in FIG. 4, a silica vapor deposition film having a thickness of 45 nm (corresponding to the barrier layer 13 in FIG. 4) was formed as an inorganic vapor deposition film by physical vapor deposition.

[0228] On the silica vapor deposition film corresponding to the barrier layer 13 in FIG. 4, a coating liquid for protective layer containing urethane resin and a silane coupling agent was applied by a gravure coating method and dried to form a protective layer having a thickness of 500 nm (corresponding to the protective layer 14 in FIG. 4). In this way, a transfer film 1 having a layer structure of PET film (supporting base material) / two heat seal layers / anchor coat layer / silica vapor deposition film (barrier layer) / protective layer was obtained.

[0229] [Example 2: Production of Transfer Film 2] In the transfer film of Example 1, a matting treatment was performed on the non-corona-treated surface of the PET film, and the following coating liquid 2 for a heat seal layer was applied to the matted surface by a gravure coating method and dried to form a heat seal layer having a thickness of 3 μm. By forming an anchor coat layer, a silica vapor deposition film (barrier layer), and a protective layer that are the same as those of the transfer film 1 of Example 1 on the surface of the formed heat seal layer opposite to the PET film, a transfer film 2 having a layer structure of PET film (supporting base material) / one heat seal layer / anchor coat layer / silica vapor deposition film (barrier layer) / protective layer was obtained.

[0230] [Examples 3 to 8, Comparative Example 1: Production of Transfer Film 3] In the transfer film of Example 1, on the non-corona-treated surface of the PET film (supporting base material), without forming a heat seal layer corresponding to the second heat seal layer 11b in FIG. 4, the following coating liquid 2 for a heat seal layer was applied by a gravure coating method and dried to form a heat seal layer having a thickness of 3 μm corresponding to the first heat seal layer 11a in FIG. 4. By forming an anchor coat layer, a silica vapor deposition film (barrier layer), and a protective layer that are the same as those of the transfer film 1 of Example 1 on the surface of the formed heat seal layer opposite to the PET film, a transfer film 3 having a layer structure of PET film (supporting base material) / one heat seal layer / anchor coat layer / silica vapor deposition film (barrier layer) / protective layer was obtained.

[0231] [Example 9: Preparation of Transfer Film 4] In the transfer film of Example 1, the following heat seal coating liquid 2 is applied to the non-corona treated surface of the PET film (support substrate) by gravure coating without forming a heat seal layer corresponding to the second heat seal layer 11b in Figure 4, and then dried to form a heat seal layer with a thickness of 3 μm corresponding to the first heat seal layer 11a in Figure 4. On the side of the formed heat seal layer opposite to the PET film, without providing an anchor coat layer, a silica vapor-deposited film (barrier layer) and a protective layer are formed, similar to the transfer film 1 of Example 1, thereby obtaining a transfer film 4 having a layer structure of PET film (support substrate) / 1 layer of heat seal layer / silica vapor-deposited film (barrier layer) / protective layer.

[0232] [Examples 10-11: Preparation of transfer film 5] In the transfer film of Example 1, the following heat seal layer coating liquid 2 is applied to the non-corona treated surface of the PET film (support substrate) by gravure coating without forming a heat seal layer corresponding to the second heat seal layer 11b in Figure 4, and then dried to form a heat seal layer with a thickness of 3 μm corresponding to the first heat seal layer 11a in Figure 4. An anchor coat layer, a silica vapor-deposited film (barrier layer), and a protective layer similar to those of the transfer film 1 in Example 1 are formed on the side of the formed heat seal layer opposite to the PET film, thereby obtaining a transfer film 5 having a layer structure of PET film (support substrate) / 1 layer heat seal layer / anchor coat layer / silica vapor-deposited film (barrier layer) / protective layer.

[0233] [Comparative Example 2: Preparation of Transfer Film 6] In the transfer film of Example 1, a release layer coating liquid 1 having the following composition is applied to the non-corona treated surface of the PET film by gravure coating and dried to form a heat seal layer with a thickness of 1 μm. An anchor coat layer, a silica vapor-deposited film (barrier layer), and a protective layer similar to those of the transfer film 1 of Example 1 are formed on the side of the formed heat seal layer opposite to the PET film to obtain a transfer film 6 having a layer structure of PET film (supporting substrate) / 1 layer of heat seal layer / anchor coat layer / silica vapor-deposited film (barrier layer) / protective layer.

[0234] [Comparative Example 3: Preparation of Transfer Film 7] In the transfer film of Example 1, the following heat seal coating liquid 2 was applied to the non-corona treated surface of the PET film (support substrate) by gravure coating without forming a heat seal layer corresponding to the second heat seal layer 11b in Figure 4, and dried to form a heat seal layer with a thickness of 3 μm corresponding to the first heat seal layer 11a in Figure 4. During the formation of this heat seal layer, by changing the drying conditions during heat seal coating, a heat seal layer was obtained in which the surface roughness Ra of the side of the heat seal layer opposite to the PET film was 1.1 μm. An anchor coat layer, a silica vapor-deposited film (barrier layer), and a protective layer similar to those of the transfer film 1 in Example 1 were formed on the side of the formed heat seal layer opposite to the PET film to obtain a transfer film 7 having a layer structure of PET film (support substrate) / 1 layer heat seal layer / anchor coat layer / silica vapor-deposited film (barrier layer) / protective layer.

[0235] [Comparative Example 4: Preparation of Transfer Film 8] In the transfer film of Example 1, the following heat seal layer coating liquid 2 is applied to the non-corona treated surface of the PET film (support substrate) by gravure coating and dried to form a heat seal layer with a thickness of 1 μm. An anchor coat layer, a silica vapor-deposited film (barrier layer), and a protective layer are formed on the side of the formed heat seal layer opposite to the PET film, similar to Example 1, to obtain a transfer film 8 having a layer structure of PET film (support substrate) / 1 layer of heat seal layer / anchor coat layer / silica vapor-deposited film (barrier layer) / protective layer.

[0236] [Coating liquid for heat seal layers] The coating liquid 1 for the heat seal layer is HYDRECT AD-1(A) (manufactured by DIC Corporation, an ethylene-acrylic acid polymer), and contains a lubricant. The coating liquid 2 for the heat seal layer is ChemiPearl (registered trademark) S120 (manufactured by Mitsui Chemicals, a metal salt of ethylene-methacrylic acid copolymer), and does not contain a lubricant. The coating liquid 3 for the heat seal layer is ChemiPearl (registered trademark) S300 (manufactured by Mitsui Chemicals, a metal salt of ethylene-methacrylic acid copolymer), and contains a lubricant. The coating liquid 4 for the heat seal layer is ChemiPearl (registered trademark) S500 (manufactured by Mitsui Chemicals, a metal salt of ethylene-methacrylic acid copolymer), and contains a lubricant.

[0237] [Coating liquid for release layer] The release layer coating liquid 1 is a silicone-modified acrylic polymer, which is a mold release agent.

[0238] [Fabrication of barrier laminates] Apply adhesive (manufactured by Rock Paint Co., Ltd., dry laminating adhesive, main component RU-004: hardener H-1 = 15:2 mass ratio) to the protective layer surface of transfer films 1-3 and 6-8, with a dry coating amount of 3.0 g / m². 2 The adhesive layer was formed by applying and drying the adhesive layer on transfer films 1-3 and 6-8. The adhesive layer surfaces of transfer films 1-3 and 6-8 were placed opposite the glossy surface of the paper substrate, and the two were bonded together. The film was then pressed at 0.5 MPa and aged at 40°C for 3 days. In this way, an intermediate laminate was obtained having a layer structure of paper substrate (glossy surface) / adhesive layer / protective layer / silica vapor-deposited film (barrier layer) / anchor coat layer / heat seal layer / PET film (support substrate). Subsequently, the PET film in the intermediate laminate was peeled off to obtain the barrier papers of Examples 1-8 and Comparative Examples 1-4. Here, the paper substrate used in Examples 1-3 was Daio Paper Corporation's Kinshachi, with a basis weight of 30 g / m². 2 Examples 4-6 use Nagoya Saraki Ryuo paper manufactured by Daio Paper Corporation, with a basis weight of 50 g / m². 2Example 7 uses Nagoya Sarashi Ryuo paper manufactured by Daio Paper Corporation, with a basis weight of 70 g / m². 2 Example 8 uses Nagoya Saraki Ryuo paper manufactured by Daio Paper Corporation, with a basis weight of 100 g / m². 2 The following was used. Furthermore, for Comparative Examples 1-4, the paper substrate was Nagoya Saraki Ryuo manufactured by Daio Paper Corporation, with a basis weight of 50 g / m². 2 I used it.

[0239] On the protective layer surface of transfer film 4, apply adhesive (manufactured by Rock Paint Co., Ltd., dry laminating adhesive, main component RU-004: hardener H-1 = 15:2 mass ratio), with a dry application amount of 3.0 g / m². 2 The adhesive layer was formed by applying and drying the material in the specified manner. The adhesive layer surface of the transfer film 4 and the glossy surface of the paper substrate were placed opposite each other, and the two were bonded together. The material was then pressed under pressure at 0.5 MPa and aged at 40°C for 3 days. In this way, an intermediate laminate was obtained having a layer structure of paper substrate (glossy surface) / adhesive layer / protective layer / silica vapor-deposited film (barrier layer) / heat seal layer / PET film (support substrate). Subsequently, the PET film in the intermediate laminate was peeled off to obtain the barrier paper of Example 9. In Example 9, the paper substrate was Nagoya Sarashi Ryuo manufactured by Daio Paper Corporation, with a basis weight of 50 g / m². 2 I used it.

[0240] The amount of wet laminating adhesive applied to the protective layer surface of transfer film 5 after drying is 3.0 g / m². 2 The adhesive was applied to the glossy surface of the paper substrate, and the two were bonded together and dried. Then, aging was performed at 40°C for 3 days. In this way, an intermediate laminate was obtained having a layer structure of paper substrate (glossy surface) / adhesive layer / protective layer / silica vapor-deposited film (barrier layer) / anchor coat layer / heat seal layer / PET film (support substrate). After that, the PET film in the intermediate laminate was peeled off to obtain the barrier papers of Examples 10 and 11. For wet laminating adhesive, Saibinol RC-1500 (acrylic-styrene copolymer) manufactured by Saiden Chemical was used in Example 10, and Saibinol DBA-137 (ethylene-vinyl acetate copolymer) manufactured by Saiden Chemical was used in Example 11. For paper substrate, Nagoya Sarashi Ryuo manufactured by Daio Paper Corporation was used in Example 10, with a basis weight of 50 g / m². 2For Example 10, we used Nagoya Saraki Ryuo paper manufactured by Daio Paper Corporation, with a basis weight of 70 g / m². 2 I used it.

[0241] In Examples 3-4, 7-11, and Comparative Example 3, the PET film (support substrate) in the intermediate laminate containing one heat-seal layer was peeled off, and the aforementioned heat-seal layer coating liquid 1 was applied to the surface of the heat-seal layer by gravure coating and dried to form a heat-seal layer with a thickness of 2 μm (corresponding to the second heat-seal layer 11b), thereby obtaining a barrier paper containing two heat-seal layers. In Example 5, the PET film (support substrate) in the intermediate laminate containing one heat-seal layer was peeled off, and the aforementioned heat-seal layer coating liquid 3 was applied to the surface of the heat-seal layer by gravure coating and dried to form a heat-seal layer with a thickness of 2 μm (corresponding to the second heat-seal layer 11b), thereby obtaining a barrier paper containing two heat-seal layers. Furthermore, in Example 6, the PET film (support substrate) in the intermediate laminate containing one heat-seal layer was peeled off, and the aforementioned heat-seal layer coating liquid 4 was applied to the surface of the heat-seal layer by gravure coating and dried to form a heat-seal layer with a thickness of 2 μm (corresponding to the second heat-seal layer 11b), thereby obtaining a barrier paper containing two heat-seal layers. In Comparative Example 2, the PET film (support substrate) in the intermediate laminate containing one heat-seal layer was peeled off, and the aforementioned heat-seal layer coating liquid 1 was applied to the surface of the heat-seal layer by gravure coating and dried to form a heat-seal layer with a thickness of 3 μm (corresponding to the second heat-seal layer 11b), thereby obtaining a barrier paper containing two heat-seal layers.

[0242] Tables 1 and 2 below summarize the evaluation results of the barrier paper (barrier laminate) for each example and comparative example.

[0243] [measurement] (Static friction coefficient) The coefficient of static friction was measured on the exposed surface on the seal surface side of the heat seal layer of the barrier papers of Examples and Comparative Examples. Specifically, in accordance with JIS K7125:1999, the barrier papers of Examples and Comparative Examples were tested in a normal temperature and normal humidity environment (23°C, 50%RH) using a Toyo Seiki Friction Tester TR-2. A SUS table and the heat seal layer of the barrier laminate attached to a 200 g plate-shaped SUS jig were placed facing each other, the SUS jig was arranged on the upper side so as to serve as a load, and the SUS jig was pulled at 100 mm / min. The frictional force between the SUS table and the heat seal layer of the barrier laminate was measured 5 times, and the average value was obtained. The SUS table and SUS jig used for the measurement were SUS304 plates that had been subjected to #400 polishing on one side.

[0244] (Coefficient of kinetic friction) The coefficient of kinetic friction was measured on the exposed surface on the seal surface side of the heat seal layer of the barrier papers of Examples and Comparative Examples. Specifically, in accordance with JIS K7125:1999, the barrier papers of Examples and Comparative Examples were tested in a normal temperature and normal humidity environment (23°C, 50%RH) using a Toyo Seiki Friction Tester TR-2. A SUS table and the heat seal layer of the barrier laminate attached to a 200 g plate-shaped SUS jig were placed facing each other, the SUS jig was arranged on the upper side so as to serve as a load, and the SUS jig was pulled at 100 mm / min. The frictional force between the SUS table and the heat seal layer of the barrier laminate was measured 5 times, and the average value was obtained. The SUS table and SUS jig used for the measurement were SUS304 plates that had been subjected to #400 polishing on one side.

[0245] (Seal strength) The seal strength between the heat-sealed layers of the barrier paper in the examples and comparative examples was measured. Specifically, the barrier paper in the examples and comparative examples was cut into 100 mm x 100 mm sections, the heat-sealed layers were overlapped, and a 10 mm x 100 mm area was heat-sealed using a heat seal tester (Tester Sangyo Co., Ltd.: TP-701-A) so that the ends were not heat-sealed and were split into two. The sections were then cut into strips with a width of 15 mm to prepare test pieces for measuring heat seal strength. Each of the two split ends of these test pieces was mounted on a tensile testing machine, and the heat-sealed portion was pulled to peel it off, and the heat seal strength (N / 15 mm width) was measured.

[0246] (Heat sealing conditions) Temperature: 120℃ Pressure: 1 kgf / cm² Time: 0.1 seconds, 0.3 seconds, 0.5 seconds, 1.0 seconds (Tensile strength test conditions) Test speed: 300 mm / min Delamination conditions: T-shaped delamination Load range: 50N

[0247] (Surface roughness Ra of the exposed surface on the sealing side of the heat seal layer) The surface roughness Ra of the exposed surface on the sealing side (the side opposite the barrier layer) of the heat-seal layer of the barrier paper in the examples and comparative examples was measured. Specifically, the arithmetic mean roughness Ra, as defined in JIS-B0601, was measured on the exposed surface on the sealing side of the heat-seal layer using a non-contact 3D surface roughness meter (NewView™7000, Zygo). Measurements were taken at 20 different locations with a field of view of 1 mm × 1 mm, and the arithmetic mean roughness (Ra) was calculated from the average value. For the barrier paper of Examples 1 and 3-11, and Comparative Examples 2 and 3, which have two heat-seal layers, the exposed surface on the sealing side of the heat-seal layer (i.e., the surface of the second heat-seal layer 11b (the side opposite the barrier layer)) was measured.

[0248] (Surface roughness Ra of the heat-sealed layer on the opposite side of the sealing surface) The surface roughness Ra of the barrier paper in the examples and comparative examples was measured on the surface opposite to the sealing surface of the heat seal layer (the barrier layer side of the heat seal layer). Specifically, it can be measured from a scanning electron microscope image (cross-sectional SEM image) of a cross-section perpendicular to the heat seal surface of the barrier laminate. The observation magnification of the cross-sectional SEM image is preferably 500 to 1000 times. After measuring the cross-sectional SEM image, the heat seal layer and the barrier layer adjacent to the heat seal layer are subjected to binarization. General image processing software can be used for binarization, for example, ImageJ, a free image analysis software developed by the National Institutes of Health (NIH). From the white areas of the obtained binarized image, only the white areas of the barrier layer adjacent to the heat seal layer are selected and retained as white areas, and the other white areas are converted to black areas. For each X coordinate of the image, the Y coordinate of the white pixel closest to the interface between the heat seal layer and the barrier layer adjacent to the heat seal layer is extracted, and the set of these is used as a curve representing the interface between the heat seal layer and the barrier layer adjacent to the heat seal layer. If the coordinates of a point on this curve are (Xi, f(Xi)) and b(x) is the function obtained by approximating f(Xi) with a linear curve, then the surface roughness Ra can be calculated as follows. Here, N is the number of pixels in the range for which Ra is calculated.

[0249]

number

[0250] The obtained Ra scale was converted from pixels to μm based on the imaging conditions of the electron microscope, and the surface roughness Ra was measured. For the barrier papers of Examples 1 and 3-11, and Comparative Examples 2 and 3, which have two heat-seal layers, the surface roughness Ra was measured on the surface opposite to the sealing surface of the heat-seal layer (i.e., the surface of the first heat-seal layer 11a (the barrier layer side)).

[0251] [evaluation] (Confirmation and evaluation of peeling condition) The peeling state of the packaging obtained using the barrier paper of the examples and comparative examples was confirmed. Specifically, packaging was prepared by heat-sealing the barrier paper of the examples and comparative examples with the heat-seal layers facing each other, and the peeling state was confirmed. (Evaluation Criteria) A: Material destruction or paper peeling B: Delamination had occurred between the heat-sealed layers.

[0252] (Suitability for bag-making machines) The suitability of the packaging materials obtained using the barrier paper of the examples and comparative examples for use in bag-making machines was confirmed. Specifically, the materials were subjected to bag-making machines under optimal conditions, and the presence or absence of wrinkle formation in the finished product was evaluated. (Evaluation Criteria) A: Create 10 and get 8 or more good quality items. B: Out of 10 produced, less than 8 were good quality.

[0253] (Barrier properties) The barrier properties (oxygen permeability and water vapor permeability) of the barrier laminates of the examples and comparative examples were evaluated. For oxygen permeability, a MOCON OX-TRAN 2 / 21 was used, with the oxygen supply side set to the paper substrate side and the detector side to the barrier layer side. The measurement conditions were 23°C and 90%RH, and the oxygen permeability (cc / m³) was measured in accordance with JIS K7126. 2 Water vapor transmission (g / m³) was measured. For water vapor transmission, a MOCON PERMATRAN 3 / 33 was used, with the water vapor supply side facing the paper substrate and the detector side facing the barrier layer. The measurement conditions were 40°C and 90%RH, and the water vapor transmission (g / m³) was measured in accordance with JIS K7129. 2 The measurement was taken on the day. The evaluation was conducted according to the following criteria. (Evaluation Criteria) • Oxygen permeability A: 0.5 cc / m 2 Less than ATM day B: 0.5 cc / m 2 ·atm·day or more, 2.5cc / m 2 Less than ATM day C: 2.5 cc / m 2 ·atm·day or more • Water vapor transmission A: 0.5g / m 2 Less than a day B: 0.5g / m 2 ·day or more, 2.5g / m 2 Less than a day C: 2.5g / m 2 • days or more

[0254] [Table 1]

[0255] [Table 2]

[0256] As can be seen from the table above, the coefficient of friction on the sealing surface side of the heat seal layer and the sealing strength between heat-seal layers It is adjusted to a predetermined range. Furthermore, the surface roughness Ra of the heat seal layer on the opposite side of the sealing surface is adjusted to a predetermined range. If a barrier laminate is used, it becomes possible to achieve both heat-sealing properties, slipperiness, and barrier properties in the heat-seal layer, resulting in a barrier laminate with excellent packaging suitability. Furthermore, in Comparative Example 3, the evaluation of barrier properties, i.e., the evaluation of oxygen permeability and water vapor permeability, both resulted in a "C" rating, confirming that it does not possess the barrier function of a barrier laminate. [Explanation of Symbols]

[0257] 1: Barrier laminate 2: Base material layer 3: Adhesive layer 4: Printing layer 5: Surface heat seal layer 10: Transfer layer 11: Heat seal layer 11a: First heat seal layer 11b: Second heat seal layer 12: Anchor coat layer 13: Barrier layer 14:Protective layer 20: Support base material 30: Transfer film 100, 200: Packaging 110, 210: Seal part

Claims

1. Paper substrate and Adhesive layer, A barrier layer which is a deposited film of a metal or inorganic compound, A heat seal layer composed of a heat sealant containing a thermoplastic resin and A barrier laminate comprising the following in this order: The exposed surface on the sealing side of the heat seal layer has a dynamic friction coefficient of less than 0.7 against the SUS plate as determined by the following test method. The sealing strength between the heat-seal layers at 120°C for 0.5 seconds and a pressure of 1 kgf / cm² is 1.8 N / 15 mm width or more. The surface roughness Ra of the exposed surface on the sealing side of the heat seal layer is 0.4 μm or more and 10 μm or less. The surface roughness Ra of the heat seal layer on the surface opposite to the sealing surface is 1 nm or more and 400 nm or less. The heat seal layer is composed of two or more layers, The surface layer of the heat seal layer, including the exposed surface on the sealing side, is composed of a heat sealant containing a lubricant. The back layer of the heat seal layer, including the surface opposite to the sealing surface, is composed of a heat sealant that does not contain a lubricant. Barrier laminate. <Testing Method> In accordance with JIS K7125:1999, under normal temperature and humidity conditions (23°C, 50% RH), a stainless steel table and a heat-sealed layer of a barrier laminate attached to a 200g plate-shaped stainless steel jig are placed facing each other, with the stainless steel jig positioned on top so that it acts as a load. The stainless steel jig is then pulled at 100 mm / min, and the frictional force between the stainless steel table and the heat-sealed layer of the barrier laminate is measured.

2. The barrier laminate according to claim 1, wherein the exposed surface on the sealing side of the heat seal layer has a static friction coefficient of less than 0.7 with respect to a SUS plate as determined by the following test method. <Testing Method> In accordance with JIS K7125:1999, under normal temperature and humidity conditions (23°C, 50% RH), a stainless steel table and a heat-sealed layer of a barrier laminate attached to a 200g plate-shaped stainless steel jig are placed facing each other, with the stainless steel jig positioned on top so that it acts as a load. The stainless steel jig is then pulled at 100 mm / min, and the frictional force between the stainless steel table and the heat-sealed layer of the barrier laminate is measured.

3. The barrier laminate according to claim 1, wherein the water vapor transmission rate of the barrier laminate at 40°C and 90% RH is 2.5 g / m²·day or less.

4. The barrier laminate according to claim 1, wherein the oxygen permeability of the barrier laminate at 23°C and 90% RH is 2.5 cc / m²·day·atm or less.

5. The barrier laminate according to claim 1, wherein the barrier layer is in contact with the heat seal layer.

6. The barrier laminate according to claim 1, wherein the barrier layer further comprises an anchor coat layer between itself and the heat seal layer, and the barrier layer and the anchor coat layer are in contact.

7. A packaging body in which the contents are packaged using a barrier laminate according to claims 1 to 6, A packaging body in which the contents are sealed by heat sealing the heat-seal layers facing each other at least a portion of the peripheral edge of the barrier laminate.

8. A packaging body in which the contents are packaged using a barrier laminate according to claims 1 to 6, A second heat seal layer, identical or different from the heat seal layer, is laminated on the paper substrate of the barrier laminate. A packaging body in which the contents are sealed by overlapping and heat-sealing the heat-seal layer and the second heat-seal layer at least a portion of the peripheral edge of the barrier laminate.

9. Peelable support substrate and A heat seal layer composed of a heat sealant containing a thermoplastic resin and A barrier layer which is a deposited film of a metal or inorganic compound, A transfer film comprising the following in this order: When the support substrate is peeled off, the exposed surface on the sealing side of the heat seal layer has a dynamic friction coefficient of less than 0.7 against the SUS plate as determined by the following test method. The sealing strength between the heat-seal layers at 120°C for 0.5 seconds and a pressure of 1 kgf / cm² is 1.8 N / 15 mm width or more. The surface roughness Ra of the exposed surface on the sealing side of the heat seal layer is 0.4 μm or more and 10 μm or less. The surface roughness Ra of the heat seal layer on the surface opposite to the sealing surface is 1 nm or more and 400 nm or less. The heat seal layer is composed of two or more layers, The surface layer of the heat seal layer, including the exposed surface on the sealing side, is composed of a heat sealant containing a lubricant. The back layer of the heat seal layer, including the surface opposite to the sealing surface, is composed of a heat sealant that does not contain a lubricant. Transfer film. <Testing Method> After transferring the transfer film to paper and peeling off the removable support substrate to create a barrier laminate, the frictional force between the SUS table and the heat-sealed layer of the barrier laminate, which is attached to a 200g plate-shaped SUS jig, is placed facing each other in a normal temperature and humidity environment (23°C, 50% RH) according to JIS K7125:1999, with the SUS jig acting as the load, and the SUS jig is pulled at 100 mm / min.

10. A method for manufacturing a barrier laminate according to claim 1, comprising a paper substrate, an adhesive layer, a barrier layer, a first heat seal layer, and a second heat seal layer in this order, The aforementioned surface layer is the second heat seal layer, The aforementioned back surface layer is the first heat seal layer, A preparation step to prepare a transfer film in which a first heat seal layer and a barrier layer are provided on a support substrate in that order, A bonding step is to bond the paper substrate to the barrier layer side of the transfer film prepared in the above preparation step via the adhesive layer to form an intermediate laminate. A peeling step is performed to peel the support substrate from the intermediate laminate formed by the above bonding step, thereby exposing the first heat seal layer. A heat seal layer formation step involves applying a heat seal layer coating liquid to the surface of the exposed first heat seal layer and drying it to form a second heat seal layer. A method for manufacturing a barrier laminate comprising the features described above.

Images