Laminates, packaging

Abstract

To provide a laminate and a package excellent in rectilinear propagation cut properties even when paper is used therein.SOLUTION: A laminate 10 includes: a paper substrate layer 11; a sealant layer 12; and an adhesive layer 14 disposed between the paper substrate layer 11 and the sealant layer 12. A relation of 0.8≤R≤5.0 is satisfied if a first direction is a presumable cut direction in an in-plane direction of the paper substrate layer 11, a second direction is a direction orthogonal to the first direction, R1 is a tensile elongation (%) of a single body of the paper substrate layer 11 in the first direction, R2 is a tensile elongation (%) of a single body of the paper substrate layer 11 in the second direction, and R=R1 / R2.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present disclosure relates to a laminate and a package using the laminate. [Background technology]

[0002] In order to design packaging for food products, daily necessities, and the like with consideration for the environment, it has been proposed to use paper, which is a renewable material (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent Publication No. 2021-130470 Summary of the Invention [Problem to be solved by the invention]

[0004] However, paper packaging has the problem of being difficult to open compared to packages using only plastic film. More specifically, when opening the packaging, the cut mark cannot be cut at the desired position and is curved, making it difficult to cut in a straight line, and fuzzing is often noticeable at the cut mark.

[0005] An object of the present disclosure is to provide a laminate and a package that have good straight-cutting properties even when using paper. [Means for solving the problem]

[0006] The present disclosure solves the above-mentioned problems by the following means: For ease of understanding, the following description will be given with reference numerals corresponding to the embodiments of the present disclosure, but the present disclosure is not limited to these.

[0007] The first disclosure is a laminate (10) comprising a paper base layer (11), a sealant layer (12), and an adhesive layer (14) provided between the paper base layer (11) and the sealant layer (12), wherein the intended cutting direction in the in-plane direction of the paper base layer (11) is defined as a first direction (D1), the direction perpendicular to the first direction (D1) is defined as a second direction (D2), the tensile elongation (%) of the paper base layer (11) alone in the first direction (D1) is defined as R1, and the tensile elongation (%) of the paper base layer (11) alone in the second direction (D2) is defined as R2, and when R=R1 / R2, the relationship of 0.8≦R≦5.0 is satisfied.

[0008] The second disclosure is the laminate (10) according to the first disclosure, which satisfies 5%≦R1≦30%.

[0009] A third disclosure is the laminate (10) according to the first or second disclosure, wherein, when the tear strength of the entire laminate (10) in the first direction (D1) is r1, the tear strength of the entire laminate (10) in the second direction (D2) is r2, and r=r2 / r1, the laminate (10) satisfies r≧1.6.

[0010] A fourth disclosure is the laminate (10) according to any one of the first to third disclosures, wherein the basis weight of the paper base layer (11) is 20 g / m 2 More than 150g / m 2 The laminate (10) is as follows:

[0011] A fifth disclosure is a package (1) that includes at least a portion of the laminate (10) described in any one of the first to fourth disclosures.

[0012] The sixth disclosure is the packaging body (1) described in the fifth disclosure, which is provided with a notch portion that serves as a trigger for cutting a part of the packaging body (1), and the notch portion is cut in a direction along the first direction (D1).

[0013] The seventh disclosure is a packaging body (1) described in the fifth or sixth disclosure, in which the weight ratio of paper in the entire packaging body (1) is the largest among the materials constituting the packaging body (1). [Effects of the Invention]

[0014] According to the present disclosure, it is possible to provide a laminate and a package that have good straight cutability even when made of paper. [Brief explanation of the drawings]

[0015] [Figure 1] 1A and 1B show examples of cross-sectional views of laminates according to the present disclosure. [Figure 2] 1 is a diagram showing a package using the laminate of the present embodiment. FIG. [Figure 3] 10A and 10B are diagrams showing another example of a package using the laminate of the present embodiment. [Figure 4] 10A and 10B are diagrams showing another example of a package using the laminate of the present embodiment. [Figure 5] 10A and 10B are diagrams showing another example of a package using the laminate of the present embodiment. [Figure 6] FIG. 1 is a diagram showing layer configurations and straightness evaluation results of examples and comparative examples. DETAILED DESCRIPTION OF THE INVENTION

[0016] Hereinafter, the best mode for carrying out the present disclosure will be described with reference to the drawings and the like.

[0017] (First embodiment) FIG. 1 is a diagram showing an example of a cross-sectional view of a laminate according to the present disclosure. Note that the figures shown below, including Figure 1, are schematic diagrams, and the size and shape of each part are exaggerated or omitted as appropriate to make them easier to understand. In the following description, specific numerical values, shapes, materials, etc. are given, but these can be changed as appropriate.

[0018] <Laminate of the embodiment> The laminate 10 is a packaging material used, for example, to package food and the like. As shown in Fig. 1 , the laminate 10 according to an embodiment of the present disclosure includes a paper substrate layer 11, a sealant layer 12 having a vapor deposition layer 13 provided on one side of the paper substrate layer 11, and an adhesive layer 14 that bonds the vapor deposition layer 13 to the paper substrate layer 11. That is, the laminate 10 includes the paper substrate layer 11, the adhesive layer 14, the vapor deposition layer 13, and the sealant layer 12 laminated in this order. Each layer constituting the laminate 10 will be described below.

[0019] (Paper base layer) The paper substrate layer 11 is a substrate layer that supports the sealant layer 12 having the vapor deposition layer 13, and is a flexible paper substrate that constitutes so-called soft paper packaging. Specifically, the paper substrate layer has a basis weight of 20 g / m 2 More than 150g / m 2 Preferably, it is 30 g / m or less. 2 More than 120g / m 2 More preferably, it is 40 g / m or less. 2 More than 100g / m 2 It is even more preferable that the weight is less than 100g. The reason why the above range is preferable is that if the basis weight is less than the above range, the strength of the packaging material will be weak, and it will be difficult to design a package with a paper ratio of more than 50%, which is the weight ratio of paper to the entire package. Also, if the basis weight is more than the above range, the insulating properties of the paper will deteriorate its processing suitability (suitability for filling machines and bag making) and its cuttability will also deteriorate. The paper base layer 11 can be selected from general-purpose papers used for packaging applications, such as kraft paper, fine paper, pure white paper, coated paper, tissue paper, waterproof paper, barrier paper, crepe paper, Clupak paper, etc. Crepe paper and Clupak paper are particularly desirable in order to set the tensile elongation ratio R, which will be described later, within a suitable range. Crepe paper is a highly elastic paper that has been wrinkled through a process called creping, and is used as a filter for extracting coffee. Clupak paper is also processed using a process called Clupak processing, which makes it less prone to wrinkling than crepe paper but highly elastic, and is used for rice bags, cement bags, etc.

[0020] It is desirable for the paper base layer 11 to have a large difference in tensile elongation (%) between two orthogonal in-plane directions. More specifically, the intended cutting direction in the in-plane direction of the paper base layer 11 is defined as the first direction, and the direction orthogonal to the first direction is defined as the second direction. The tensile elongation (%) of the paper base layer 11 alone in the first direction is defined as R1, and the tensile elongation (%) of the paper base layer 11 alone in the second direction is defined as R2, with the tensile elongation ratio R = R1 / R2. Here, it is desirable for the tensile elongation ratio R to satisfy the relationship 0.8≦R≦5.0. This is because, based on the comparison results of the examples described below, a ratio of 0.8≦R ensures good straight-cutting properties. Furthermore, if R exceeds 5.0, the paper base layer 11 is likely to stretch significantly in the first direction, making it difficult to align the pattern during printing and causing significant curling during lamination, making processing difficult.

[0021] It is also desirable that the tensile elongation R1 of the paper base layer 11 alone in the first direction satisfies the following relationship. 5%≦R1≦30% If R1 is less than 5%, the sheet will be more likely to tear in the second direction, reducing its ability to cut straight. If R1 is more than 30%, the sheet will be more likely to stretch in the first direction, making it difficult to align the image during printing and causing significant curling during lamination, making it difficult to process.

[0022] The paper base layer 11 is usually produced by being continuously transported in a long form, and therefore has an MD (machine direction) (transport direction, flow direction) and a TD (transverse direction) (width direction, vertical direction) perpendicular to the transport direction. In many papers, it is often desirable that the first direction coincides with the MD and the second direction coincides with the TD. However, it is desirable to determine whether the intended cutting direction is the MD or the TD based on the tensile elongation ratio R.

[0023] By ensuring that the tensile elongation ratio R satisfies the above relationship, it is possible to improve straight-line cutting ability when manually tearing and opening the package in the first direction. The reason for this is that the paper base layer 11 stretches in the first direction, meaning that even if force is applied from the second direction, the paper stretches in the first direction and absorbs it, making it difficult to tear in the second direction. And because it is difficult to tear in the second direction but can tear in the first direction, it is thought that straight-line cutting ability is improved when cutting in the first direction. Therefore, when forming the laminate as a package, it is desirable to set the orientation of the laminate so that the direction in which you want the laminate to go straight when cut upon opening (the direction in which you want the user to cut) is the first direction.

[0024] Here, on the surface of the paper substrate layer 11 opposite to the adhesive layer 14, a design layer and a surface layer may be provided in this order as required. (Picture layer) The picture layer is a printed layer on which a picture is printed, and is provided on the surface of the paper base layer 11 opposite the adhesive layer 14. Here, the picture refers to various recording objects that can be recorded or printed on the paper base layer 11, and is not particularly limited and broadly includes figures, letters, designs, patterns, symbols, patterns, marks, etc. In particular, when the laminate 10 is used for packaging such as packaging bags intended to contain food, the picture used may be a picture of the contents or letters indicating information such as the product name, expiration date, production date, and production number of the contents. The picture layer is applied by, for example, gravure printing, flexographic printing, inkjet printing, screen printing, etc.

[0025] (Surface layer) The surface layer is a layer provided on the pattern layer, and is the layer located furthest outward from the container when the laminate 10 is used in a package such as a packaging bag. The surface layer is formed, for example, from overprint varnish (OP varnish), and can prevent the pattern layer from being lost due to rubbing or the like, and can prevent the pattern from being tampered with. In the above description, an example has been described in which a design layer and a surface layer are sequentially provided on the paper base layer 11, but the design layer and the surface layer may be omitted as appropriate, if necessary.

[0026] Furthermore, in order to improve the strength of the package formed, a base material layer may be provided on the adhesive layer 14 side of the paper base material layer 11 or on the side opposite to the adhesive layer 14. Examples of the base material layer include a PET (polyethylene terephthalate) resin layer, a polyamide resin layer, a PP (polypropylene) resin layer, and an aluminum foil layer.

[0027] (sealant layer) The sealant layer 12 is a layer that appears on the surface of the laminate 10 opposite to the paper base layer 11. When the laminate 10 is used to form a package such as a packaging bag, the sealant layer 12 is the innermost layer and has heat-sealing properties that allow it to adhere when heated. The sealant layer 12 may also have a vapor-deposited layer 13 on the paper base layer 11 side, and this embodiment illustrates an example in which the vapor-deposited layer 13 is provided. Details of the vapor-deposited layer 13 will be described later.

[0028] Films made of polyolefin resins such as polyethylene resins and polypropylene resins, ethylene-vinyl acetate copolymers, ethylene-propylene block copolymers, and other polyolefin resins, as well as conventionally known easy-peel films, can be used as the sealant layer 12. The sealant layer 12 may be configured as a single layer using films made of these materials, or may be configured as multiple layers.

[0029] Furthermore, when the packaging body is used as a container for a microwave oven, heat resistance is required, so it is preferable that the sealant layer 12 has a non-oriented polypropylene layer (CPP layer) mainly containing non-oriented polypropylene (CPP) or a linear low-density polyethylene layer (LLDPE layer) mainly containing linear low-density polyethylene (LLDPE).

[0030] When the sealant layer 12 is formed of a polyethylene-based resin, the polyethylene-based resin means at least an ethylene homopolymer or a copolymer with ethylene as a comonomer, and more specifically, includes polyethylene or a copolymer of ethylene and an α-olefin. For example, the sealant layer 12 may be composed solely of polyethylene, or may be composed solely of a copolymer of ethylene and an α-olefin. Alternatively, the sealant layer 12 may be composed solely of a material that is a mixture of polyethylene and a copolymer of ethylene and an α-olefin.

[0031] Polyethylene is classified into, for example, low-density polyethylene (LDPE), medium-density polyethylene (MDPE), and high-density polyethylene (HDPE). LDPE has a density of 0.910 g / cm 3 or more and 0.925g / cm 3 The following polyethylene: MDPE has a density of 0.926 g / cm 3 or more and 0.940g / cm 3 HDPE is polyethylene with a density of 0.941 g / cm 3 or more and 0.965g / cm 3 The following polyethylenes are available. LDPE is obtained by polymerizing ethylene at a high pressure, for example, of 1000 atmospheres or more and less than 2000 atmospheres. MDPE and HDPE are obtained by polymerizing ethylene at a medium or low pressure, for example, of 1 atmosphere or more and less than 1000 atmospheres. MDPE and HDPE may partially contain a copolymer of ethylene and an α-olefin.

[0032] An example of a copolymer of ethylene and an α-olefin is linear low-density polyethylene (LLDPE). LLDPE is obtained by copolymerizing an α-olefin with a linear polymer obtained by polymerizing ethylene under medium or low pressure to introduce short-chain branches. Examples of α-olefins include butene-1 (C4), hexene-1 (C6), 4-methylpentene (C6), and octene-1 (C8). The density of LLDPE is, for example, 0.915 g / cm. 3or greater than 0.945 g / cm 3 The following is the result.

[0033] When the sealant layer 12 is formed of a polypropylene-based resin, the polypropylene-based resin means at least a propylene homopolymer or a copolymer containing propylene as a comonomer, and may be one or more of homopolypropylene, random copolymer polypropylene, and block copolymer polypropylene. Random copolymer polypropylene is particularly preferred. Random copolymer polypropylene is a random copolymer containing propylene and an α-olefin other than propylene. For example, it may contain ethylene, butene-1, 4-methyl-1-pentene, etc. in addition to propylene. Specific examples include ethylene-propylene random copolymers.

[0034] The polypropylene-based resin may be blended with the polyethylene-based resin described above. The mass ratio of the polyethylene-based resin in the sealant layer 12 may be 1% or more, 5% or more, or 10% or more. The mass ratio of polyethylene in the sealant layer 12 may be 30% or less, 25% or less, or 20% or less.

[0035] The sealant layer 12 may be a single layer having a predetermined density, or may include multiple layers. For example, the sealant layer 12 may include, in order from the vapor deposition layer 13 side, a first layer, a second layer, and a third layer.

[0036] Of the first, second, and third layers, two adjacent layers may have different densities or structures. Preferably, the layer located furthest from the vapor-deposited layer 13, i.e., the layer that will be the innermost layer when the package is formed (here, the third layer), may have a lower density than the other layers. For example, in the case of a polyethylene-based resin, the third layer may be LDPE, LLDPE, or a mixed resin of LDPE and LLDPE. In the case of a polypropylene-based resin, the third layer may be a layer in which the polyethylene-based resin is blended with the random copolymer polypropylene.

[0037] The thickness of the sealant layer 12 is preferably 10 μm or more, more preferably 15 μm or more, and even more preferably 20 μm or more. If the thickness of the sealant layer 12 is thinner than the above range, the sealing strength of the packaging material will be reduced, resulting in poor packaging suitability. Furthermore, the thickness of the sealant layer 12 is preferably 80 μm or less, more preferably 60 μm or less, and even more preferably 40 μm or less, because if the thickness of the sealant layer 12 is greater than the above range, the amount of plastic increases, which increases the environmental load.

[0038] (deposited layer) The vapor-deposited layer 13 is a barrier layer provided to suppress the transmission of oxygen and water vapor through the laminate 10. As described above, the vapor-deposited layer 13 of this embodiment is provided on the surface of the sealant layer 12 facing the paper substrate layer 11, and is formed of a metal or an inorganic oxide. In the present disclosure, the vapor-deposited layer refers to a film formed by a vapor deposition method in a broad sense, and includes not only films formed by vacuum deposition but also films formed by sputtering or the like. The vapor-deposited layer 13 does not need to be formed separately when using a commercially available sealant layer 12 in which the vapor-deposited layer 13 is already provided, but may be formed by the method described below. Also, the vapor-deposited layer 13 may be omitted.

[0039] Here, examples of metals that can be used for the vapor-deposited layer 13 include aluminum (Al), magnesium (Mg), tin (Sn), sodium (Na), titanium (Ti), lead (Pb), zirconium (Zr), yttrium (Y), gold (Au), and chromium (Cr). In particular, for packaging, it is preferable to have an aluminum vapor-deposited film.

[0040] Examples of inorganic oxides used for the vapor-deposited layer 13 include metal oxides of the above metals such as aluminum oxide and titanium oxide, as well as silica, which is an oxide of silicon (Si). In particular, for packaging, it is preferable to provide a vapor-deposited film of aluminum oxide.

[0041] The thickness of the vapor-deposited layer 13 varies depending on the type of metal used, but is preferably selected from the range of 50 to 2000 Å, and more preferably 100 to 1000 Å. More specifically, in the case of an aluminum vapor-deposited film, the thickness is preferably 50 to 600 Å, and even more preferably 100 to 450 Å.

[0042] Examples of methods for forming the deposition layer 13 include physical vapor deposition (PVD) methods such as vacuum deposition, sputtering, and ion plating, and chemical vapor deposition (CVD) methods such as plasma chemical vapor deposition, thermal chemical vapor deposition, and photochemical vapor deposition.

[0043] The vapor deposition layer 13 can be formed by, for example, applying the above-mentioned metal or inorganic oxide directly to the sealant layer 12 by the above-mentioned vacuum vapor deposition method or the like. When the vapor deposition layer 13 is provided directly on the sealant layer 12 as described above, the surface of the sealant layer 12 can be pretreated as necessary. Specifically, the surface of the sealant layer 12 can be pretreated by physical treatments such as corona discharge treatment, ozone treatment, low-temperature plasma treatment using oxygen gas or nitrogen gas, or glow discharge treatment, or by chemical treatments such as oxidation treatment using chemicals. The sealant layer 12 including the vapor deposition layer 13 is not limited to the above-described form, and for example, an intermediate layer serving as an anchor layer that strengthens the adhesion between the sealant layer 12 and the vapor deposition layer 13 may be further provided between the sealant layer 12 and the vapor deposition layer 13. Also, for example, instead of providing a vapor deposition layer, a second substrate layer may be provided between the sealant layer and the adhesive layer.

[0044] (adhesive layer) The adhesive layer 14 can be made of a general film laminating adhesive (ether-based, ester-based, etc.), or low-density PE (polyethylene), LLDPE (linear low-density polyethylene), EMAA (ethylene and methacrylic acid copolymer resin), etc., which are used in extrusion lamination.

[0045] Examples of ether-based adhesives include polyether polyurethane. Polyether polyurethane is produced by reacting polyether polyol with isocyanate. Examples of isocyanate that can be used include aromatic isocyanates such as tolylene diisocyanate (TDI) and xylylene diisocyanate (XDI), aliphatic isocyanates such as hexamethylene diisocyanate (HMDI), and alicyclic isocyanates such as isophorone diisocyanate (IPDI), as well as isocyanate compounds such as adducts or polymers of the above-mentioned various isocyanate compounds.

[0046] Examples of ester-based adhesives include polyester polyurethane. Polyester polyurethane is produced by the reaction of polyester polyol with isocyanate. Examples of isocyanate are the same as those for the ether-based adhesives described above.

[0047] Furthermore, a barrier adhesive may be used as the adhesive layer 14 to further suppress the amount of oxygen and water vapor that permeates the laminate and that cannot be suppressed by the vapor deposition layer 13 described above. Specifically, fine irregularities are formed on the surface of the vapor-deposited layer 13, and at the fine level, the thickness of the vapor-deposited layer 13 is not uniform, with the barrier properties being lower in the thinner parts and resulting in non-uniform barrier properties overall. However, when the adhesive layer 14 made of a barrier adhesive comes into contact with the vapor-deposited layer 13, the irregularities are filled in and flattened, thereby making the barrier properties uniform and further increasing the effect of inhibiting the permeation of oxygen and water vapor.

[0048] The barrier adhesive is preferably a urethane-based adhesive having urethane bonds, which is a cured product of a resin composition containing a resin (polyol) having two or more hydroxyl groups per molecule and an isocyanate compound (polyisocyanate) having two or more isocyanate groups per molecule. The urethane-based adhesive is preferably a two-component curing type. Examples of methods for imparting barrier properties to the resin composition include a method of introducing a skeleton having barrier properties into the resin constituting the resin composition (barrier organic adhesive), a method of incorporating a phosphate-modified compound into the resin composition, and a method of incorporating a plate-like inorganic compound into the resin composition (barrier inorganic adhesive), and one or more of these methods can be combined.

[0049] As a method for introducing a skeleton having barrier properties into the resin constituting the above-mentioned resin composition, it is preferable that the main skeleton of the resin (polyol) is polyester or polyester polyurethane, and that the polyester-constituting monomer component contains an ortho-oriented aromatic dicarboxylic acid or its anhydride.

[0050] The resin has two or more hydroxyl groups in one molecule and a main skeleton of a polyester structure or a polyester polyurethane structure. The polyester portion of the main skeleton structure is obtained by polycondensation reaction of a polycarboxylic acid and a polyhydric alcohol by a known, commonly used method. Examples of polycarboxylic acids include aliphatic polycarboxylic acids and aromatic polycarboxylic acids. Specific examples of the aliphatic polycarboxylic acids include succinic acid, adipic acid, azelaic acid, sebacic acid, dodecanedicarboxylic acid, and 1,4-cyclohexanedicarboxylic acid.

[0051] Specific examples of aromatic polycarboxylic acids include orthophthalic acid, terephthalic acid, isophthalic acid, pyromellitic acid, trimellitic acid, 1,2-naphthalenedicarboxylic acid, 1,8-naphthalenedicarboxylic acid, 2,3-naphthalenedicarboxylic acid, 1,4-naphthalenedicarboxylic acid, 2,5-naphthalenedicarboxylic acid, 2,6-naphthalenedicarboxylic acid, naphthalic acid, biphenyldicarboxylic acid, 1,2-bis(phenoxy)ethane-p,p'-dicarboxylic acid, and anhydrides of these dicarboxylic acids; polybasic acids such as p-hydroxybenzoic acid and p-(2-hydroxyethoxy)benzoic acid. These polycarboxylic acids can be used alone or in combination of two or more.

[0052] In the present disclosure, as a component having barrier properties, it is preferable that the polycarboxylic acid contains an ortho-oriented aromatic dicarboxylic acid or an anhydride thereof.The content of the ortho-oriented aromatic dicarboxylic acid or an anhydride thereof is preferably 70 to 100 mass% relative to the total polycarboxylic acid components of the polyester-constituting monomer components.

[0053] Specific examples of the ortho-oriented aromatic dicarboxylic acid include orthophthalic acid, 1,2-naphthalenedicarboxylic acid, 1,8-naphthalenedicarboxylic acid, 2,3-naphthalenedicarboxylic acid, and anhydrides of these dicarboxylic acids.

[0054] Examples of the polyhydric alcohol include aliphatic polyhydric alcohols and aromatic polyhydric phenols. Specific examples of the aliphatic polyhydric alcohol include ethylene glycol, propylene glycol, butylene glycol, neopentyl glycol, cyclohexanedimethanol, 1,5-pentanediol, 3-methyl-1,5-pentanediol, 1,6-hexanediol, methylpentanediol, dimethylbutanediol, butylethylpropanediol, diethylene glycol, triethylene glycol, tetraethylene glycol, dipropylene glycol, and tripropylene glycol.

[0055] Specific examples of aromatic polyhydric phenols include hydroquinone, resorcinol, catechol, naphthalenediol, biphenol, bisphenol A, bisphenol F, tetramethylbiphenol, and ethylene oxide-extended products and hydrogenated alicyclic phenols thereof.

[0056] The isocyanate compound (polyisocyanate) has two or more isocyanate groups in the molecule, and may be either aromatic or aliphatic, and may be either a low-molecular-weight compound or a high-molecular-weight compound, and known compounds such as diisocyanate compounds with two isocyanate groups or polyisocyanate compounds with three or more isocyanate groups can be used. The isocyanate compound may be a blocked isocyanate compound obtained by addition reaction using a known isocyanate blocking agent by an appropriate known and commonly used method.

[0057] Among these, polyisocyanate compounds are preferred from the viewpoint of adhesiveness and retort resistance, and those having an aromatic ring are preferred from the viewpoint of imparting oxygen barrier properties, and isocyanate compounds containing a metaxylene skeleton are particularly preferred.

[0058] Specific examples of the isocyanate compound include adducts, biuret compounds, and allophanate compounds obtained by reacting an excess amount of these isocyanate compounds with low-molecular-weight active hydrogen compounds such as ethylene glycol, propylene glycol, meta-xylylene alcohol, 1,3-bishydroxyethylbenzene, 1,4-bishydroxyethylbenzene, trimethylolpropane, glycerol, pentaerythritol, erythritol, sorbitol, ethylenediamine, monoethanolamine, diethanolamine, triethanolamine, and meta-xylylenediamine, and alkylene oxide adducts thereof, various polyester resins, polyether polyols, and high-molecular-weight active hydrogen compounds such as polyamides.

[0059] (Phosphate-modified compounds) The resin composition may contain, in addition to the above resins, a phosphate-modified compound, which has the effect of improving adhesive strength to inorganic members, and any known or commonly used phosphate-modified compound can be used.

[0060] Specific examples include phosphoric acid, pyrophosphoric acid, triphosphoric acid, methyl acid phosphate, ethyl acid phosphate, butyl acid phosphate, dibutyl phosphate, 2-ethylhexyl acid phosphate, bis(2-ethylhexyl) phosphate, isododecyl acid phosphate, butoxyethyl acid phosphate, oleyl acid phosphate, tetracosyl acid phosphate, 2-hydroxyethyl methacrylate acid phosphate, polyoxyethylene alkyl ether phosphate, and the like, and one or more of these can be used.

[0061] (plate-like inorganic compound) In addition to the above resins, the resin composition may contain a plate-like inorganic compound, which has the effect of improving the lamination strength and oxygen barrier properties of the laminate via the barrier adhesive. Specific examples of the plate-like inorganic compound (M) include kaolinite-serpentine group clay minerals (halloysite, kaolinite, endelite, dickite, nacrite, etc., antigorite, chrysotile, etc.), pyrophyllite-talc group (pyrophyllite, talc, kerola, etc.), etc., and one or more of these can be used.

[0062] The thickness of the barrier adhesive is 0.5 to 8.0 μm, preferably 1.0 to 5.0 μm, and more preferably 2.0 to 4.5 μm. If the thickness is thinner than the above range, the gas barrier property is likely to be insufficient, and if the thickness is thicker than the above range, the bending resistance is likely to be poor, which is likely to lead to a decrease in the gas barrier property after bending.

[0063] The barrier adhesive may be a solvent-based adhesive or a solventless (non-solvent) adhesive. When a solvent-based adhesive is used as the barrier adhesive, for example, PASLIM VM001 / 108CP, a barrier organic adhesive manufactured by DIC Corporation, can be used, and the paper base layer 11 and the sealant layer 12 including the vapor-deposited layer 13 can be bonded by a dry lamination method. When a solventless adhesive is used as the barrier adhesive, for example, PASLIM NSRD011 / NSRD006, a barrier organic adhesive manufactured by DIC Corporation, can be used, and the paper base layer 11 and the sealant layer 12 including the vapor-deposited layer 13 can be bonded by a non-solvent lamination method. Another example of an organic barrier adhesive that can be used is "Maxieve (registered trademark)," which is disclosed in Japanese Patent Application Laid-Open Nos. 2003-300271 and 2010-012769, and is an adhesive that uses a non-bisphenol A polyepoxy resin as a base component and a polyamine as a curing agent, and is marketed by Mitsubishi Gas Chemical Company, Inc. as a gas barrier adhesive.

[0064] The laminate having the above configuration preferably satisfies the relationship r≧1.6, where r1 is the tear strength of the entire laminate in the first direction D1, r2 is the tear strength of the entire laminate in the second direction D2, and r=r2 / r1. As shown in the comparison results of the examples described below, satisfying the relationship r≧1.6 throughout the entire laminate improves the straight cutability when cut in the direction along the first direction D1. On the other hand, if r<1.6, the straight cutability is impaired, and the ease of opening is reduced.

[0065] (Packaging using laminate) Fig. 2 is a diagram showing a package using the laminate of this embodiment. Fig. 2(A) is a diagram showing a packaging bag 1A which is an example of a package using the laminate 10 of this embodiment, and Fig. 2(B) is a diagram showing a packaging bag 1B which is another example of a package using the laminate 10 of this embodiment. Fig. 3 is a diagram showing another example of a package using the laminate of this embodiment. Fig. 3(A) is a plan view showing a packaging bag 1C, which is an example of a package using the laminate 10 of this embodiment, and Fig. 3(B) is a cross-sectional view of part B of Fig. 3(A). Fig. 4 shows another example of a package using the laminate of this embodiment. Fig. 4(A) is a plan view showing a packaging bag 1D, which is an example of a package using the laminate 10 of this embodiment, and Fig. 4(B) is a cross-sectional view of part B in Fig. 4(A). FIG. 5 is a diagram showing another example of a package using the laminate of this embodiment, and is a diagram showing a box-shaped packaging bag 1E, which is an example of a package using the laminate 10.

[0066] The laminate 10 of this embodiment can be applied to, for example, a pillow-type packaging bag 1A shown in FIG. 2(A) or a flat pouch-type packaging bag 1B shown in FIG. 2(B). The pillow-shaped packaging bag 1A shown in Figure 2(A) is produced by heat-sealing the sealant layers 12 on a pair of opposing sides of a single rectangular laminate 10 to form a spine seal portion 2, thereby forming a cylindrical shape, and then heat-sealing the top and bottom openings of the cylindrical shape to form an upper seal portion 3 and a lower seal portion 4. 2(A) is provided with opening notch portions N formed by cutting out portions of the upper seal portion 3 and the lower seal portion 4 at both the top and bottom ends of the packaging bag 1A. With this configuration, the packaging bag 1A can be opened by cutting off a portion of the laminate 10 from the main body of the packaging bag 1A using the notch portions N. As shown by the arrows in the figure, the first direction D1 is the direction in which the upper seal portion 3 and the lower seal portion 4 face each other (the up-down direction), and the second direction D2 is the direction perpendicular to the first direction D1 (the left-right direction). Therefore, the notch portion N is cut in a direction along the first direction. The laminate 10 has high straight-line cuttability in the first direction D1, and therefore, with the above configuration, when opening the packaging bag 1A, it can be cut in a straight line substantially along the cutting line CL indicated by the two-dot chain line with little fuzzing by simply cutting it by hand starting from the notch N. Note that the cutting line CL is shown for illustrative purposes, and the cutting line CL may or may not actually be indicated on the packaging bag 1A by printing or the like (the same applies to other packaging bags).

[0067] In addition, the packaging bag 1B shown in Figure 2 (B) is produced by folding a single rectangular laminate 10 in half with the sealant layers 12 facing each other, and heat-sealing the three sides other than the fold line 5 to form the seal portion 6. 2(B), notch portions N for opening are provided by cutting out portions of the seal portions 6 on both the left and right ends of the packaging bag 1B. With this configuration, the packaging bag 1B can be opened by cutting off a portion of the laminate 10 from the main body of the packaging bag 1B using the notch portions N. As shown by the arrows in the figure, the first direction D1 is the direction in which the sealed portions 6 at both the left and right ends face each other (the left-right direction), and the second direction D2 is the direction perpendicular to the first direction D1 (the up-down direction in which the fold line 5 faces the upper sealed portion 6). Therefore, the notch N is cut in a direction along the first direction D1. The laminate 10 has high straight-line cutting ability in the first direction D1, and therefore, with the above configuration, when opening the packaging bag 1B, it can be cut in a straight line approximately along the cutting line CL indicated by the dotted line with little fuzzing by simply cutting it by hand using the notch portion N as a starting point.

[0068] Furthermore, the packaging bag 1C shown in Fig. 3 is a packaging bag in which a zipper-operated opening / closing portion is provided at the opening portion of the flat pouch-type packaging bag shown in Fig. 2(B). Specifically, as shown in Fig. 3(A), a zipper portion 24 is provided on the inside of the vicinity of the top seal portion 21 of the packaging bag 1C so as to follow the top seal portion 21. As shown in Fig. 3(B), the zipper portion 24 is made up of, for example, a male member 24A and a female member 24B that can fit together, with the male member 24A being disposed on the inner surface of the laminate on the front side of the packaging bag 1C and the female member 24B being disposed on the inner surface of the laminate on the opposing back side, and the zipper portion 24 is in a closed state when they fit together. Furthermore, notch portions N for opening are provided by cutting out portions of the side seal portions 22, 23 at both ends of the packaging bag 1C between the top seal portion 21 and the zipper portion 24. With this configuration, the packaging bag 1C can be opened and closed freely using the zipper portion 24 after the top seal portion 21 is separated from the main body of the packaging bag 1C by the notch portions N and opened. As shown by the arrows in the figure, the first direction D1 is set in the direction in which the side seal portions 22 and 23 at both left and right ends face each other (the left-right direction parallel to the zipper portion 24), and the second direction D2 is set in a direction perpendicular to the first direction D1 (the up-down direction in which the side seal portions 22, 23 extend). Therefore, the notch portion N is cut in a direction along the first direction D1. The laminate 10 has high straight-line cutting ability in the first direction D1, and therefore, with the above configuration, when opening the packaging bag 1B, it can be cut in a straight line approximately along the cutting line CL indicated by the dotted line with little fuzzing by simply cutting it by hand using the notch portion N as a starting point.

[0069] The laminate of this embodiment can also be used for a stand-up pouch-type packaging bag 1D, as shown in Fig. 4. The packaging bag 1D shown in Fig. 4 is formed by stacking two rectangular laminates 10A and 10B with their sealant layers 12 facing each other, and heat-sealing the top and both sides. The bottom side is formed by sandwiching a laminate 10C folded in half between the two laminates 10A and 10B with their sealant layers 12 facing each other, and then heat-sealing the outer edge of the laminate 10C to the laminates 10A and 10B. This configuration allows the packaging bag 1D filled with contents to become a self-standing pouch, with the laminate 10C serving as the bottom. Furthermore, a notch N for opening is provided by cutting out a portion of the side seals 22, 23 at both ends of the packaging bag 1D between the top seal 21 and the zipper 24. With this configuration, the packaging bag 1D can be opened and closed freely by the zipper 24 after the top seal 21 is separated from the main body of the packaging bag 1C by the notch N and opened. As shown by the arrows in the figure, the first direction D1 is set in the direction in which the side seal portions 22 and 23 at both left and right ends face each other (the left-right direction parallel to the zipper portion 24), and the second direction D2 is set in a direction perpendicular to the first direction D1 (the up-down direction in which the side seal portions 22, 23 extend). Therefore, the notch portion N is cut in a direction along the first direction D1. The laminates 10A and 10B have high straight-line cutting properties in the first direction D1, and therefore, with the above configuration, when opening the packaging bag 1B, it can be cut in a straight line approximately along the cutting line CL indicated by the dotted line with little fuzzing by simply cutting it by hand using the notch portion N as a starting point.

[0070] The laminate 10 of this embodiment can also be applied to a box-shaped packaging bag 1E, as shown in Fig. 5. The packaging bag 1E shown in Fig. 5 is a box-shaped packaging bag made up of five laminates 10, and is formed from laminate 10A forming the bottom, laminates 10B and 10C forming the front and back portions, respectively, and laminates 10D and 10E forming the sides. The box-shaped packaging bag 1E is formed by joining the edges of adjacent laminates by heat sealing, with the sealant layer 12 on the inside of the packaging bag 1E. In addition, the packaging bag 1E shown in Figure 5 has its top and upper side edges directly heat-sealed to laminate 10B, which forms the front portion, and laminate 10C, which forms the back portion, to form top seal portion 41 and side seal portions 42, 43, and is formed in a shape that is tapered at the top side compared to the bottom side. Furthermore, packaging bag 1E is provided with an openable zipper 44 along top seal 41, and a notch 45 for opening packaging bag 1E, which is provided in part of side seals 42, 43 between zipper 44 and top seal 41. As a result, after top seal 41 is separated from the main body of packaging bag 1E by notch 45 and opened, zipper 44 can be used to open and close the bag. As shown by the arrows in the figure, the first direction D1 is set in the direction in which the side seal portions 42 and 43 at both left and right ends face each other (the left-right direction parallel to the zipper portion 44), and the second direction D2 is set in a direction perpendicular to the first direction D1 (the up-down direction in which the side seal portions 42, 43 extend). Therefore, the notch portion N is cut in a direction along the first direction D1. The laminates 10B and 10C have high straight-line cutting properties in the first direction D1, and therefore, with the above configuration, when opening the packaging bag 1B, it can be cut in a straight line approximately along the cutting line CL indicated by the dotted line with little fuzzing by simply cutting it by hand using the notch portion N as a starting point.

[0071] In addition, in any of the above-mentioned exemplary packaging forms, it is desirable that the weight ratio of paper in the entire packaging be the largest among the materials constituting the packaging. This increases the proportion of recyclable materials in the packaging, thereby reducing the environmental impact. In the packaging of this embodiment, the materials constituting the packaging include "paper," "resin," and "metal."

[0072] The shape of the packaging bag is not limited to the above-mentioned shape, and may be a gusset-type packaging bag or the like. Furthermore, the term "packaging body" in the present disclosure is a general term for cases where the laminate of the present disclosure is used as a packaging material, and includes not only packaging bags but also container-shaped objects, and even components that constitute part of a packaging container, such as lid materials, are within the scope of the term "packaging body." [Example]

[0073] The present disclosure will be described in further detail below based on examples. In the paper base layer used in the following examples, the first direction D1 coincides with the MD direction, and the second direction D2 coincides with the TD direction. FIG. 6 is a diagram showing the layer structures of the examples and comparative examples and the results of evaluation of straightness. The tensile elongation was measured using JIS-Z-1707. The test conditions were as follows: First, a test specimen was cut from the laminate 10 into a strip shape with a width of 15 mm in the direction perpendicular to the direction of measurement and a length of 150 mm in the direction of measurement. Both ends of the test specimen were clamped with chucks in a tensile tester with a chuck distance of 10 mm. The specimen was then pulled vertically at a rate of 50 mm / min until it broke, and the percentage of elongation until it broke was recorded. The average of 10 trials was used as the tensile elongation of the laminate. As the tensile tester, for example, Tensilon STA-115 manufactured by A&D Corporation can be used. The tear strength was measured using JIS-K-7128 Method B (Elmendorf method). Four sheets were tested, and the average of the maximum tear loads over 10 trials was recorded as the tear strength. Specifically, an Elmendorf tear tester S-01 manufactured by Toyo Seiki Seisakusho Co., Ltd. was used. The straight cutability was evaluated by sensory evaluation when the package was actually opened by hand. A very good straight cutability was rated as "A," a good straight cutability was rated as "B," and a poor straight cutability was rated as "C." In addition, the following abbreviations are used in Figure 6: Coffee filter: Light brown coffee filter (mix) PASLIM:VM001 / 108CP PET: Polyethylene terephthalate

[0074] Example 1 The laminate of Example 1 was made of a paper base layer of crepe paper (light brown coffee filter (MIX): manufactured by Tenma Special Paper Co., Ltd., basis weight 53.1 g / m) having a tensile elongation rate R1 in the first direction of the paper alone of 15.9%, a tensile elongation rate R2 in the second direction of 4%, and a ratio R of the tensile elongation rates in the first direction and the second direction of 4.0. 2 , thickness 0.201mm, paper density 0.264g / cm 3 ) was used. In addition to the paper base layer, a sealant film was prepared. The sealant film of Example 1 was a sealant layer having a vapor deposition layer, and aluminum-deposited CPP (non-oriented polypropylene) (CP-VR manufactured by Reiko Co., Ltd., thickness 40 μm) was used. A solvent-based barrier adhesive (PASLIM VM001 / 108CP: manufactured by DIC Corporation) was applied to the vapor-deposited layer of the sealant film to a dry thickness of 3 μm to form an adhesive layer as a barrier adhesive layer, which was then bonded to the surface of the paper substrate opposite the printed layer and aged at 40°C for 3 days to obtain a laminate. Using this laminate, a stand-up pouch type package (see Figure 4) with a width of 120 mm, a height of 150 mm, and a bottom gusset of 34 mm was produced. In the laminate of Example 1, the tear strength r1 in the first direction was 710 (mN), the tear strength r2 in the second direction was 1749 (mN), and the ratio r of the tear strength in the second direction to the tear strength in the first direction was 2.463. The sensory evaluation of the straight cuttability of the package showed that the straight cuttability when opened was very good, earning a rating of "A."

[0075] <Example 2> The laminate and packaging body of Example 2 were the same as those of Example 1, except that they were aged for one day at 25°C using an ether-based adhesive (RU3600 / H-689 (dry thickness 3 μm): manufactured by Rock Paint Co., Ltd.). In the laminate of Example 2, the tear strength r1 in the first direction was 640 (mN), the tear strength r2 in the second direction was 1638 (mN), and the ratio r of the tear strength in the second direction to the tear strength in the first direction was 2.559. The sensory evaluation of the straight cuttability of the package showed that the straight cuttability when opened was very good, earning a rating of "A."

[0076] Example 3 The laminate and packaging body of Example 3 were the same as those of Example 1, except that an ester-based adhesive (RU77T / H-7 (dry thickness 3 μm): manufactured by Rock Paint Co., Ltd.) was used. In the laminate of Example 3, the tear strength r1 in the first direction was 721 (mN), the tear strength r2 in the second direction was 1753 (mN), and the ratio r of the tear strength in the second direction to the tear strength in the first direction was 2.431. The sensory evaluation of the straight cuttability of the package showed that the straight cuttability when opened was very good, earning a rating of "A."

[0077] Example 4 The laminate and packaging body of Example 4 were the same as those of Example 1, except that the sealant layer was made of CPP (non-oriented polypropylene) GLC (thickness 40 μm) manufactured by Mitsui Chemicals Tohcello Inc. In the laminate of Example 4, the tear strength r1 in the first direction was 635 (mN), the tear strength r2 in the second direction was 1672 (mN), and the ratio r of the tear strength in the second direction to the tear strength in the first direction was 2.633. The sensory evaluation of the straight cuttability of the package showed that the straight cuttability when opened was very good, earning a rating of "A."

[0078] <Example 5> The laminate and package of Example 5 were the same as those of Example 1, except that the sealant layer was made of LLDPE (low density polyethylene) TUX-MCS (thickness 40 μm) manufactured by Mitsui Chemicals Tohcello Inc. In the laminate of Example 5, the tear strength r1 in the first direction was 627 (mN), the tear strength r2 in the second direction was 1418 (mN), and the ratio r of the tear strength in the second direction to the tear strength in the first direction was 2.262. The sensory evaluation of the straight cuttability of the package showed that the straight cuttability when opened was very good, earning a rating of "A."

[0079] Example 6 The laminate and packaging body of Example 6 are the same as those of Example 1, except that the sealant layer is CPP (non-oriented polypropylene) GLC (thickness 40 μm): manufactured by Mitsui Chemicals Tohcello Co., Ltd., the second base layer is PET (polyethylene terephthalate) (E5102 (thickness 12 μm): manufactured by Toyobo Co., Ltd.), and the adhesive is RU3600 / H-689 (dry thickness 3 μm): manufactured by Rock Paint Co., Ltd. In the laminate of Example 6, the tear strength r1 in the first direction was 1691 (mN), the tear strength r2 in the second direction was 4120 (mN), and the ratio r of the tear strength in the second direction to the tear strength in the first direction was 2.436. The sensory evaluation of the straight cuttability of the package showed that the straight cuttability when opened was very good, earning a rating of "A."

[0080] Example 7 The laminate and package of Example 7 are the same as those of Example 1, except that the sealant layer is TUX-MCS (thickness 40 μm) made of LLDPE (low-density polyethylene) manufactured by Mitsui Chemicals Tohcello Co., Ltd., the second substrate layer is aluminum foil (8021 material (thickness 7 μm) manufactured by Toyo Aluminum K.K.), and the adhesive is RU77T / H-7 (dry thickness 3 μm) manufactured by Rock Paint Co., Ltd. In the laminate of Example 7, the tear strength r1 in the first direction was 1530 (mN), the tear strength r2 in the second direction was 3762 (mN), and the ratio r of the tear strength in the second direction to the tear strength in the first direction was 2.459. The sensory evaluation of the straight cuttability of the package showed that the straight cuttability when opened was very good, earning a rating of "A."

[0081] Example 8 The laminate and packaging body of Example 8 were made of Clupak paper (TKS, manufactured by Tokushu Tokai Paper Co., Ltd., basis weight 50 g / m) as a paper base layer. The paper alone had a tensile elongation rate R1 in the first direction of 6.3%, a tensile elongation rate R2 in the second direction of 6.9%, and a ratio R of the tensile elongation rates in the first direction and the second direction of 0.9. 2 , thickness 0.115mm, paper density 0.633g / cm 3 ) was used in the same manner as in Example 1. In the laminate of Example 8, the tear strength r1 in the first direction was 635 (mN), the tear strength r2 in the second direction was 1130 (mN), and the ratio r of the tear strength in the second direction to the tear strength in the first direction was 1.780. The sensory evaluation of the straight cuttability of the package showed that the straight cuttability when opened was good, earning a rating of "B."

[0082] <Comparative Example 1> The laminate and packaging body of Comparative Example 1 were made of a paper base layer of unbleached kraft paper (Tokai Kraft C: manufactured by Tokushu Tokai Paper Co., Ltd., basis weight 50 g / m) with a tensile elongation rate R1 of 1.5% in the first direction, a tensile elongation rate R2 of 5.2% in the second direction, and a ratio R of the tensile elongation rates in the first direction and the second direction of 0.3. 2 , thickness 0.077mm, paper density 0.653g / cm 3 ) was used in the same manner as in Example 1. In the laminate of Comparative Example 1, the tear strength r1 in the first direction was 804 (mN), the tear strength r2 in the second direction was 922 (mN), and the ratio r of the tear strength in the second direction to the tear strength in the first direction was 1.147. The sensory evaluation of the straight cuttability of the package showed poor straight cuttability when opened, resulting in a rating of "C."

[0083] <Comparative Example 2> The laminate and packaging body of Comparative Example 2 were made of a paper base layer of unbleached one-sided glossy kraft paper (Gintake, manufactured by Nippon Paper Industries Co., Ltd., basis weight 51 g / m) with a tensile elongation rate R1 of 1.8% in the first direction, a tensile elongation rate R2 of 2.3% in the second direction, and a ratio R of the tensile elongation rates in the first direction and the second direction of 0.8. 2 , thickness 0.078mm, paper density 0.654g / cm 3 ) was used in the same manner as in Example 1. In the laminate of Comparative Example 2, the tear strength r1 in the first direction was 546 (mN), the tear strength r2 in the second direction was 834 (mN), and the ratio r of the tear strength in the second direction to the tear strength in the first direction was 1.527. The sensory evaluation of the straight cuttability of the package showed poor straight cuttability when opened, resulting in a rating of "C."

[0084] As described above, the laminate and packaging body of this embodiment can be made to have excellent straight cutability by satisfying the relationship 0.8≦R≦5.0. Furthermore, by satisfying the relationship r≧1.6, the laminate and packaging body of this embodiment can be made to have excellent straight cuttability more reliably. The present disclosure is not limited to the above-described embodiments, and various modifications and variations are possible, and these are also within the scope of the present disclosure. [Explanation of symbols]

[0085] 1(1A, 1B, 1C, 1D, 1E) Packaging bag (packaging body) 10 Laminate 11 Paper base layer 12 Sealant Layer 13 Deposited layer 14 Adhesive layer

Claims

1. A paper base layer; a sealant layer; an adhesive layer provided between the paper substrate layer and the sealant layer; Equipped with When the intended cutting direction in the in-plane direction of the paper base layer is defined as a first direction, the direction perpendicular to the first direction is defined as a second direction, the tensile elongation (%) of the paper base layer alone in the first direction is defined as R1, and the tensile elongation (%) of the paper base layer alone in the second direction is defined as R2, and R = R1 / R2, 0.8≦R≦5.0 Fulfilling the relationship, When the tear strength of the entire laminate in the first direction is r1, the tear strength of the entire laminate in the second direction is r2, and r = r2 / r1, r≧1.6 Meet the laminate.

2. The laminate according to claim 1 , 5%≦R1≦30% Meet the laminate.

3. The laminate according to claim 1 or 2, The basis weight of the paper base layer is 20 g / m ２ 150g / m or more ２ The laminate is as follows:

4. A package comprising at least a portion of the laminate according to any one of claims 1 to 3.

5. The package according to claim 4, A notch portion is provided to trigger cutting of a part of the packaging body, The packaging body, wherein the notch portion is cut in a direction along the first direction.

6. The packaging body according to claim 4 or claim 5, The weight ratio of paper to the entire packaging is the largest among the materials that make up the packaging.

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