JP2023065180A - laminate, package - Google Patents

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

The present disclosure relates to a laminate and a package using this laminate.

The use of paper, which is a recyclable material, has been proposed in order to design packages for foods, daily necessities, and the like in an environmentally friendly manner (see, for example, Patent Document 1).

Japanese Patent Application Laid-Open No. 2021-130470

However, a paper-based package has a problem of poor openability compared to a package using only a plastic film. More specifically, when the package is opened, the cut mark cannot be cut at a desired position and is bent, making it difficult to cut in a straight line.

An object of the present disclosure is to provide a laminate and a package that have good straight cutting properties even when paper is used.

The present disclosure solves the above problems with the following solutions. In order to facilitate understanding, reference numerals corresponding to the embodiments of the present disclosure will be used for description, but the present disclosure is not limited thereto.

A first disclosure comprises a paper substrate layer (11), a sealant layer (12), and an adhesive layer (14) provided between the paper substrate layer (11) and the sealant layer (12). and a direction to be cut in the in-plane direction of the paper base layer (11) is set as a first direction (D1), and a direction perpendicular to the first direction (D1) is set as a second direction (D2), Let R1 be the tensile elongation rate (%) of the paper base layer (11) alone in the first direction (D1), and the tensile elongation of the paper base layer (11) alone in the second direction (D2). The laminate (10) satisfies the relationship of 0.8≦R≦5.0, where R=R1/R2, where R2 is the rate (%).

A second disclosure is a laminate (10) that satisfies 5%≦R1≦30% in the laminate (10) according to the first disclosure.

A third disclosure is that in the laminate (10) according to the first disclosure or the second disclosure, the tear strength of the entire laminate (10) in the first direction (D1) is r1, and the The laminate (10) satisfies r≧1.6 when the tear strength of the laminate (10) as a whole in two directions (D2) is r2 and r=r2/r1.

A fourth disclosure is the laminate (10) according to any one of the first disclosure to the third disclosure, wherein the basis weight of the paper base layer (11) is 20 g/m ² or more and 150 g/m ² or less, the laminate (10).

A fifth disclosure is a package (1) at least partially including the laminate (10) according to any one of the first disclosure to the fourth disclosure.

A sixth disclosure is the package (1) according to the fifth disclosure, which includes a notch portion that serves as a trigger for cutting a part of the package (1), and the notch portion is arranged in the first direction ( A package (1) cut in the direction along D1).

The seventh disclosure is that in the package (1) described in the fifth disclosure or the sixth disclosure, the weight ratio of paper in the entire package (1) is the material constituting the package (1) is the largest package (1).

Advantageous Effects of Invention According to the present disclosure, it is possible to provide a laminate and a package that have good straight cutting properties even when paper is used.

FIG. 3 illustrates an example cross-sectional view of a laminate according to the present disclosure; It is a figure which shows the package using the laminated body of this embodiment. It is a figure which shows the other example of the package using the laminated body of this embodiment. It is a figure which shows the other example of the package using the laminated body of this embodiment. It is a figure which shows the other example of the package using the laminated body of this embodiment. It is a figure which shows the layer structure of an Example and a comparative example, and the result of linearity evaluation.

BEST MODE FOR CARRYING OUT THE INVENTION The best mode for carrying out the present disclosure will be described below with reference to the drawings.

(First embodiment)
FIG. 1 is a diagram illustrating an example of a cross-sectional view of a laminate according to the present disclosure.
Each figure shown below, including FIG. 1, is a schematic diagram, and the size and shape of each part are exaggerated or omitted as appropriate to facilitate understanding. ing.
Also, in the following description, specific numerical values, shapes, materials, and the like are shown and described, but these can be changed as appropriate.

<Laminate of Embodiment>
The laminate 10 is, for example, a packaging material used for packaging food and the like. As shown in FIG. 1 , the laminate 10 of the embodiment, which is an example of the present disclosure, includes a paper base layer 11 and a vapor deposition layer 13 provided on one side of the paper base layer 11. A sealant layer 12 and an adhesive layer 14 that joins the vapor deposition layer 13 and the paper base layer 11 . That is, the laminated body 10 is formed by laminating a paper substrate layer 11, an adhesive layer 14, a deposition layer 13, and a sealant layer 12 in this order.
Each layer constituting the laminate 10 will be described below.

(Paper base layer)
The paper substrate layer 11 is a substrate layer that supports the sealant layer 12 having the deposition layer 13, and is a flexible paper substrate that constitutes so-called flexible paper packaging. Specifically, the basis weight of the paper base layer is preferably 20 g/m ² or more and 150 g/m ² or less, more preferably 30 g/m ² or more and 120 g/m ² or less, and 40 g/m ² . More preferably, it is at least 100 g/m ² or less. 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 becomes weak, and it becomes difficult to design a package with a paper ratio exceeding 50%, which is the weight ratio of paper in the entire package. be. Also, if the basis weight is greater than the above range, the heat insulating properties of the paper deteriorate processing suitability (suitability for filling machines and suitability for bag making), and cuttability also deteriorates.
The paper base layer 11 can be selected from general-purpose paper used for packaging, such as kraft paper, fine paper, pure white paper, coated paper, thin paper, water-resistant paper, barrier paper, crepe paper, and Clupak paper. . In particular, crepe paper and Clupak paper are desirable in order to keep the ratio R of tensile elongation rate, which will be described later, in a suitable range.
Crepe paper is a highly stretchable paper that has undergone a process called creping to form wrinkles, and is used as a filter for extracting coffee.
Clupak paper is also subjected to a process called Clupak processing, which has less wrinkles than crepe paper, but is highly stretchable paper, and is used for rice bags, cement bags, and the like.

It is desirable that the paper base layer 11 has a large difference in tensile elongation (%) in two directions perpendicular to each other in the in-plane direction. More specifically, the planned cutting direction in the in-plane direction of the paper base material layer 11 is defined as the first direction, and the direction orthogonal to the first direction is defined as the second direction. Then, the tensile elongation rate (%) of the paper base layer 11 alone in the first direction is R1, the tensile elongation rate (%) of the paper base layer 11 alone in the second direction is R2, and the tensile elongation rate is Let the ratio R=R1/R2. Here, it is desirable that the ratio R of the tensile elongation rate satisfies the relationship of 0.8≦R≦5.0. This is because, according to the comparison results of the examples described later, if 0.8≦R, the straight cutting performance can be improved. On the other hand, if the R exceeds 5.0, it tends to be stretched greatly in the first direction, which makes it difficult to match the pattern registration during printing, and curling becomes large during lamination processing, making processing difficult.

Moreover, it is desirable that the tensile elongation rate R1 of the paper base layer 11 alone in the first direction satisfies the following relationship.
5%≤R1≤30%
This is because if R1 is less than 5%, cutting is likely to occur in the second direction as well, resulting in reduced straight cutting performance. On the other hand, if the R1 exceeds 30%, it tends to stretch greatly in the first direction, making it difficult to register the pattern during printing, and curling becomes large during lamination processing, making processing difficult.

In addition, since the paper base layer 11 is usually manufactured by being continuously transported in a long form, the MD (machine direction) direction (transport direction, flow direction) and the TD (transport direction) perpendicular to the transport direction transverse direction) (width direction, vertical direction). In many papers, it is often desirable for the first direction to match the MD direction and the second direction to match the TD direction. However, it is desirable to determine whether the planned cutting direction is the MD direction or the TD direction, depending on the ratio R of the tensile elongation.

To improve the straight cutability when cutting in a direction along the first direction when manually tearing and opening the package by making the ratio R of the tensile elongation satisfy the above relationship. can be done. The reason for this is that the paper substrate layer 11 stretches in the first direction, that is, even if a force is applied from the second direction, the paper stretches in the first direction and is absorbed. It may be difficult to cut. Further, since it is difficult to cut in the second direction and can be cut in the first direction, it is considered that straight cutability is improved when cutting in the first direction.
Therefore, when the laminate is formed as a package, the orientation of the laminate should be set so that the first direction is the direction in which the package should be cut when unsealed (the direction in which the user wants the user to cut the package). is desirable.

Here, a pattern layer and a surface layer may be sequentially provided on the surface of the paper substrate layer 11 opposite to the adhesive layer 14 as necessary.
(picture layer)
The pattern layer is provided on the surface of the paper substrate layer 11 opposite to the adhesive layer 14, and is a printed layer on which a pattern is printed. Here, the pattern is a recording object of various forms that can be recorded or printed on the paper base layer 11, and is not particularly limited, and includes drawings, letters, patterns, patterns, symbols, designs, marks, and the like. broadly includes In particular, when the laminate 10 is used for a packaging body such as a packaging bag intended to contain food, the design may include a diagram of the contents, the product name of the contents, the expiration date, the production date, and the production number. Characters indicating information such as are used. The pattern layer is applied by, for example, gravure printing, flexographic printing, inkjet printing, screen printing, or the like.

(Surface layer)
The surface layer is a layer provided on the pattern layer, and when the laminate 10 is used for a packaging body such as a packaging bag, the surface layer is the layer located on the outermost side of the container. The surface layer is formed of, for example, an overprint varnish (OP varnish), and can suppress disappearance of the pattern layer due to rubbing or the like, and suppress falsification of the pattern.
In the above description, an example in which the pattern layer and the surface layer are sequentially provided on the paper base material layer 11 has been described, but the pattern layer and the surface layer may be omitted as appropriate.

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

(sealant layer)
The sealant layer 12 is a layer exposed on the surface of the laminate 10 opposite to the paper base layer 11 . The sealant layer 12 is the innermost layer when a package such as a packaging bag is formed using the laminate 10, and has a heat-sealing property with an adhesive property by heating. Moreover, the sealant layer 12 may provide the vapor deposition layer 13 in the paper base material layer 11 side, and the example which provided the vapor deposition layer 13 is illustrated in this embodiment. Details of the vapor deposition layer 13 will be described later.

As the sealant layer 12, polyolefin resins such as polyethylene resins and polypropylene resins, films made of polyolefin resins such as ethylene-vinyl acetate copolymers and ethylene-propylene block copolymers, and conventionally known easy peel films. A film or the like can be used. The sealant layer 12 may be configured as a single layer of films made of these materials, or the sealant layer 12 may be configured as multiple layers.

Further, when the package is used as a container for a microwave oven, heat resistance is required, so the sealant layer 12 is mainly an unstretched polypropylene layer (CPP layer) containing unstretched polypropylene (CPP), or It is preferred to have a linear low density polyethylene layer (LLDPE layer) comprising linear low density polyethylene (LLDPE).

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 containing ethylene as a comonomer. More specifically, polyethylene, Alternatively, it contains a copolymer of ethylene and α-olefin. For example, the sealant layer 12 may be composed only of polyethylene, or may be composed only of a copolymer of ethylene and α-olefin. Alternatively, the sealant layer 12 may be composed only of a material obtained by mixing polyethylene and a copolymer of ethylene and α-olefin.

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

Copolymers of ethylene and α-olefins are, for example, linear low density polyethylene (LLDPE). LLDPE is obtained by copolymerizing an α-olefin into a linear polymer obtained by polymerizing ethylene at medium or low pressure to introduce short chain branches. Examples of α-olefins include butene-1 (C4), hexene-1 (C6), 4-methylpentene (C6), octene-1 (C8) and the like. The density of LLDPE is, for example, 0.915 g/cm ³ or more and 0.945 g/cm ³ or less.

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 having propylene as a comonomer. Any one or more block copolymerized polypropylene may be used. Among them, random copolymerized polypropylene is preferred. Random copolymer polypropylene is a random copolymer containing propylene and an α-olefin other than propylene. For example, in addition to propylene, it can include ethylene, butene-1, 4-methyl-1-pentene, and the like. Specific examples include ethylene-propylene random copolymers.

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.

Sealant layer 12 may be a single layer having a predetermined density. Alternatively, sealant layer 12 may include multiple layers. For example, the sealant layer 12 may include a first layer, a second layer and a third layer in order from the deposition layer 13 side.

Adjacent two layers of the first, second and third layers may have different densities or structures. Preferably, the layer located farthest from the deposited layer 13, that is, the layer that will be the innermost layer when the package is formed (here, the third layer) has a lower density than the other layers. may For example, in the case of 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 layer may be a layer in which a polyethylene-based resin is blended with the random copolymerized polypropylene.

The thickness of the sealant layer 12 is desirably 10 μm or more, more desirably 15 μm or more, and even more desirably 20 μm or more. If the thickness of the sealant layer 12 is less than the above range, the seal strength of the packaging material will be reduced, resulting in poor packaging suitability.
Also, the thickness of the sealant layer 12 is desirably 80 μm or less, more desirably 60 μm or less, and even more desirably 40 μm or less. This is because if the thickness of the sealant layer 12 is thicker than the above range, the amount of plastic increases and the environmental load increases.

(evaporation layer)
The vapor deposition layer 13 is a barrier layer provided for suppressing permeation of oxygen and water vapor passing through the laminate 10 . As described above, the vapor deposition layer 13 of the present embodiment is provided on the surface of the sealant layer 12 on the paper base layer 11 side, and is made of metal or inorganic oxide. A vapor deposition layer in the present disclosure means a film formed by a vapor deposition method in a broad sense, and includes not only a vacuum vapor deposition method but also a film formed by sputtering or the like.
The vapor deposition layer 13 need not be formed separately when using a commercially available product in which the sealant layer 12 is provided with the vapor deposition layer 13 in advance, but may be formed by the method described below. Also, the deposition layer 13 may be omitted.

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

Examples of the inorganic oxide applied to the deposition layer 13 include aluminum oxide, titanium oxide, etc., which are metal oxides of the above metals, and silica, which is an oxide of silicon (Si). In particular, for packages, it is preferable to have a vapor-deposited film of aluminum oxide.

Although the film thickness of the vapor deposition layer 13 varies depending on the type of metal used, it is desirable to select and form it within the range of, for example, 50 Å or more and 2000 Å or less, preferably 100 Å or more and 1000 Å or less. More specifically, in the case of a deposited aluminum film, the film thickness is preferably 50 Å or more and 600 Å or less, more preferably 100 Å or more and 450 Å or less.

As a method for forming the deposited layer 13, for example, a physical vapor deposition method (Physical Vapor Deposition method, PVD method) such as a vacuum deposition method, a sputtering method, and an ion plating method, or a plasma chemical vapor deposition method, a thermal A chemical vapor deposition method (Chemical Vapor Deposition method, CVD method) such as a chemical vapor deposition method and a photochemical vapor deposition method can be used.

The deposition layer 13 can be formed, for example, by directly applying the above-described metal or inorganic oxide to the sealant layer 12 by the above-described vacuum 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, corona discharge treatment and ozone treatment. , physical treatment such as low-temperature plasma treatment using oxygen gas or nitrogen gas, glow discharge treatment, etc., or chemical treatment such as oxidation treatment using chemicals or the like may be performed.
In addition, the sealant layer 12 including the vapor deposition layer 13 is not limited to the above-described form. For example, it serves as an anchor layer between the sealant layer 12 and the vapor deposition layer 13 that strengthens the adhesion between both layers. An intermediate layer may also be provided. Also, for example, instead of providing the deposition layer, a second base material layer may be provided between the sealant layer and the adhesive layer.

(adhesive layer)
As the adhesive layer 14, general film laminating adhesives (ether-based, ester-based, etc.), low-density PE (polyethylene) used in extrusion lamination, LLDPE (linear low-density polyethylene), EMAA (ethylene and methacrylic acid) and the like can be used.

Examples of ether-based adhesives include polyether polyurethane and the like. Polyether polyurethanes are produced by the reaction of polyether polyols and isocyanates. Examples of isocyanates 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). or adducts or polymers of the various isocyanate compounds described above.

Examples of ester-based adhesives include polyester polyurethane and the like. A polyester polyurethane is produced by reacting a polyester polyol and an isocyanate. Examples of isocyanates are the same as for the ether-based adhesives described above.

In addition, as the adhesive layer 14, a barrier adhesive may be used to further suppress oxygen permeating through the laminate and water vapor that cannot be suppressed by the vapor deposition layer 13 described above.
Specifically, the surface of the vapor deposition layer 13 is formed with a fine uneven shape, and at a fine level, the thickness of the vapor deposition layer 13 is not uniform, and the barrier properties of relatively thin portions are low. Although the barrier property becomes non-uniform, when the adhesive layer 14 made of the barrier adhesive is in contact with the deposited layer 13, the irregularities are filled and flattened, so that the barrier property is made uniform and oxygen and The effect of suppressing permeation of water vapor can be further enhanced.

The barrier adhesive is a cured product of a resin composition containing a resin (polyol) having two or more hydroxyl groups in one molecule and an isocyanate compound (polyisocyanate) having two or more isocyanate groups in one molecule. A urethane-based adhesive having a urethane bond is preferable. The urethane-based adhesive is preferably of a two-liquid curing type. Examples of the configuration 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), and a method of adding a phosphoric acid-modified compound to the resin composition. A method of including a plate-like inorganic compound in the resin composition (barrier inorganic adhesive), and the like can be mentioned, and one or more of these can be combined.

As a method for introducing a skeleton having a barrier property into the resin constituting the resin composition, the main skeleton of the resin (polyol) is polyester or polyester polyurethane, and the polyester-constituting monomer component is an ortho-oriented aromatic dicarboxylic acid or its Those containing anhydrides are preferred.

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

Specific aromatic polycarboxylic acids include orthophthalic acid, terephthalic acid, isophthalic acid, pyromellitic acid, trimellitic acid, 1,2-naphthalenedicarboxylic acid, 1,8-naphthalenedicarboxylic acid, and 2,3-naphthalene. Dicarboxylic 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 acids and anhydrides of these dicarboxylic acids; and polybasic acids such as p-hydroxybenzoic acid and p-(2-hydroxyethoxy)benzoic acid. These polyvalent carboxylic acids can be used alone or in combination of two or more.

In the present disclosure, it is preferable that an ortho-oriented aromatic dicarboxylic acid or an anhydride thereof is included as a polyvalent carboxylic acid as a configuration having barrier properties. The ortho-oriented aromatic dicarboxylic acid or its anhydride has a content of 70 to 100% by mass of the ortho-oriented aromatic dicarboxylic acid or its anhydride with respect to all the polyvalent carboxylic acid components of the polyester-constituting monomer component. preferable.

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

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

Specific examples of aromatic polyhydric phenols include hydroquinone, resorcinol, catechol, naphthalenediol, biphenol, bisphenol A, hisphenol F, tetramethylbiphenol, ethylene oxide extension products thereof, and hydrogenated alicyclic etc. can be exemplified.

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

Among them, polyisocyanate compounds are preferred from the viewpoint of adhesion and retort resistance, and those having an aromatic ring are preferred from the viewpoint of imparting oxygen barrier properties, and isocyanate compounds containing a meta-xylene skeleton are particularly preferred.

Specific isocyanate compounds include, for example, tetramethylene diisocyanate, hexamethylene diisocyanate, toluene diisocyanate, diphenylmethane diisocyanate, hydrogenated diphenylmethane diisocyanate, meta-xylylene diisocyanate, hydrogenated xylylene diisocyanate, isophorone diisocyanate, or isocyanate compounds thereof. Trimers and excess amounts of these isocyanate compounds, such as ethylene glycol, propylene glycol, metaxylylene alcohol, 1,3-bishydroxyethylbenzene, 1,4-bishydroxyethylbenzene, trimethylolpropane, glycerol, pentaerythritol , erythritol, sorbitol, ethylenediamine, monoethanolamine, diethanolamine, triethanolamine, metaxylylenediamine and other low-molecular-weight active hydrogen compounds and their alkylene oxide adducts, various polyester resins, polyether polyols, and polyamides. Examples include adducts, burettes, allophanates, etc. obtained by reacting with active hydrogen compounds and the like.

(Phosphate modified compound)
The resin composition may contain a phosphoric acid-modified compound in addition to the above resins. The phosphoric acid-modified compound has the effect of improving the adhesive strength to inorganic members, and known and commonly used compounds can be used.

Specifically, 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 phosphoric acid, etc., and one or more of these can be used.

(plate-like inorganic compound)
The resin composition may contain a plate-like inorganic compound in addition to the above resins. The plate-like inorganic compound 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 clay minerals (halloysite, kaolinite, enderite, dickite, nacrite, etc., antigorite, chrysotile, etc.), pyrophyllite-talc group (pyrophyllite, talc, kerorai, etc.), etc., and one or more of these can be used.

The thickness of the barrier adhesive is 0.5-8.0 μm, preferably 1.0-5.0 μm, more preferably 2.0-4.5 μm. If it is thinner than the above range, the gas barrier properties tend to be insufficient, and if it is thicker than the above range, the bending resistance tends to be inferior, which tends to lead to a decrease in the gas barrier properties after bending.

The barrier adhesive may be composed of a solvent-based adhesive, or may be composed of a solvent-free (non-solvent) adhesive. When a solvent-based adhesive is used as the barrier adhesive, for example, PASLIM VM001/108CP manufactured by DIC Corporation, which is an organic barrier adhesive, can be applied. Layer 12 can be joined by a dry lamination method. When a solvent-free adhesive is used as the barrier adhesive, for example, PASLIM NSRD011/NSRD006 manufactured by DIC, which is an organic barrier adhesive, can be applied, and has a paper base layer 11 and a vapor deposition layer 13. The sealant layer 12 can be bonded by a non-solvent lamination method.
Further, as other barrier organic adhesives, disclosed in JP-A-2003-300271 and JP-A-2010-012769, an adhesive based on a non-bisphenol A polyepoxy resin and a polyamine as a curing agent. "Maxieve (registered trademark)" marketed by Mitsubishi Gas Chemical Co., Ltd. as a gas barrier adhesive can also be used.

In the laminate having the above configuration, the tear strength of the entire laminate in the first direction D1 is r1, the tear strength of the entire laminate in the second direction D2 is r2, and when r=r2/r1, r It is desirable to satisfy the relationship ≧1.6. As shown in the comparison results of the examples described later, by satisfying the relationship r≧1.6 for the entire laminate, the straight cutting property when cutting in the direction along the first direction D1 is good. becomes. On the other hand, when r<1.6, straight cutability is impaired and unsealability is deteriorated.

(Package 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 as an example of a package using the laminate 10 of the present embodiment, and FIG. 2(B) is a package using the laminate 10 of the present embodiment. FIG. 10 is a diagram showing a packaging bag 1B that is another example of a body;
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 the present embodiment, and FIG. 3(B) is a cross-sectional view of part B in FIG. 3(A). is.
FIG. 4 is a diagram showing another example of a package using the laminate of this embodiment. FIG. 4(A) is a plan view showing a packaging bag 1D as an example of a package using the laminate 10 of the present embodiment, and FIG. 4(B) is a cross-sectional view of part B in FIG. 4(A) is.
FIG. 5 is a view showing another example of a package using the layered product of the present embodiment, and is a view showing a box-type packaging bag 1E as an example of a package using the layered product 10. As shown in FIG.

The laminate 10 of the present embodiment can be applied to, for example, a pillow-type packaging bag 1A shown in FIG. 2(A) and a flat pouch-type packaging bag 1B shown in FIG. 2(B).
A pillow-type packaging bag 1A shown in FIG. 2A is formed by heat-sealing sealant layers 12 on a pair of opposing sides of a rectangular laminate 10 to form a back seal portion 2, thereby forming a cylinder. The upper and lower seal portions 3 and 4 are formed by heat-sealing the upper and lower openings of the tubular shape, respectively.
In addition, the packaging bag 1A shown in FIG. 2A is provided with opening notch portions N obtained by notching portions of the upper sealing portion 3 and the lower sealing portion 4 at both upper and lower ends of the packaging bag 1A. With this configuration, the packaging bag 1A can be opened by separating a part of the laminate 10 from the main body of the packaging bag 1A by the notch portion N.
Here, as indicated by an arrow in the drawing, the first direction D1 is provided in the direction (vertical direction) in which the upper seal portion 3 and the lower seal portion 4 face each other, and is perpendicular to the first direction D1. A second direction D2 is provided in the direction (horizontal direction). Therefore, the notch portion N is cut along the first direction.
Since the laminate 10 has a high straight cutting property in the first direction D1, due to the above configuration, when the packaging bag 1A is opened, it can be cut only by hand using the notch portion N as a trigger, resulting in less fluffing. It can be cut linearly substantially along the cutting line CL. The cutting line CL is illustrated for explanation, and the cutting line CL may or may not actually be shown by printing or the like on the packaging bag 1A (other The same applies to the packaging bag of ).

In addition, the packaging bag 1B shown in FIG. 2B is obtained by folding one rectangular laminate 10 in half so that the sealant layer 12 faces each other, and heat-sealing the three sides other than the folding line 5 to seal. It is made by forming part 6 .
Moreover, the packaging bag 1B shown in FIG. 2B is provided with opening notch portions N obtained by notching a part of the seal portions 6 at both left and right ends of the packaging bag 1B. With this configuration, the packaging bag 1B can be opened by separating a part of the laminate 10 from the main body of the packaging bag 1B by the notch portion N.
Here, as indicated by arrows in the drawing, the first direction D1 is provided in the direction (horizontal direction) in which the seal portions 6 on both the left and right ends face each other, and the direction perpendicular to the first direction D1 (folding line A second direction D2 is provided in the up-down direction in which 5 and the upper seal portion 6 face each other. Therefore, the notch portion N is cut along the first direction D1.
Since the laminate 10 has a high straight cutting property in the first direction D1, due to the above configuration, when the packaging bag 1B is opened, it is only cut by hand using the notch portion N as a trigger, and there is little fluffing. It can be cut linearly substantially along the cutting line CL.

A packaging bag 1C shown in FIG. 3 is a packaging bag obtained by providing an opening/closing portion with a chuck at the unsealing portion of the flat pouch type packaging bag shown in FIG. 2(B). Specifically, as shown in FIG. 3A, a chuck portion 24 is provided along the upper seal portion 21 inside the packaging bag 1C near the upper seal portion 21 . As shown in FIG. 3B, the chuck portion 24 is composed of, for example, a male member 24A and a female member 24B that can be fitted to each other. A female die member 24B is arranged on the inner surface of the laminate on the back side facing the member 24A, and by fitting them together, the chuck portion 24 is closed.
Between the upper seal portion 21 and the chuck portion 24, a notch portion N for unsealing is provided by notching a part of the side seal portions 22 and 23 at both ends of the packaging bag 1C. With this configuration, the packaging bag 1C can be opened and closed by the chuck portion 24 after the upper seal portion 21 is separated from the main body of the packaging bag 1C by the notch portion N and opened.
Here, as indicated by arrows in the figure, the first direction D1 is provided in the direction in which the side seal portions 22 and 23 at the left and right ends face each other (horizontal direction parallel to the chuck portion 24). A second direction D2 is provided in a direction perpendicular to the first direction D1 (vertical direction in which the side seal portions 22 and 23 extend). Therefore, the notch portion N is cut along the first direction D1.
Since the laminate 10 has a high straight cutting property in the first direction D1, due to the above configuration, when the packaging bag 1B is opened, it is only cut by hand using the notch portion N as a trigger, and there is little fluffing. It can be cut linearly substantially along the cutting line CL.

As shown in FIG. 4, the laminate of this embodiment can also be used for a stand pouch type packaging bag 1D. A packaging bag 1D shown in FIG. 4 is formed by stacking two rectangular laminates 10A and 10B so that the sealant layers 12 face each other, and heat-sealing the top and both sides. In addition, the laminated body 10C folded in two on the lower side is sandwiched between the two laminated bodies 10A and 10B so that the sealant layer 12 faces each other, and the outer peripheral edge of the laminated body 10C and the laminated body 10A, 10B by heat sealing. By adopting such a form, the packaging bag 1D filled with the contents becomes a so-called standing pouch that can stand on its own with the laminate 10C serving as the bottom surface.
Between the upper seal portion 21 and the chuck portion 24, a notch portion N for unsealing is provided by notching a part of the side seal portions 22 and 23 at both ends of the packaging bag 1D. With this configuration, the packaging bag 1D can be opened and closed by the chuck portion 24 after the upper seal portion 21 is separated from the main body of the packaging bag 1C by the notch portion N and opened.
Here, as indicated by arrows in the figure, the first direction D1 is provided in the direction in which the side seal portions 22 and 23 at the left and right ends face each other (horizontal direction parallel to the chuck portion 24). A second direction D2 is provided in a direction perpendicular to the first direction D1 (vertical direction in which the side seal portions 22 and 23 extend). Therefore, the notch portion N is cut along the first direction D1.
Since the laminates 10A and 10B have a high straight cutting property in the first direction D1, with the above configuration, when the packaging bag 1B is opened, it can be cut only by hand using the notch portion N as a trigger. It can be cut linearly substantially along the cutting line CL indicated by .

As shown in FIG. 5, the laminate 10 of this embodiment can also be applied to a box-type packaging bag 1E. A packaging bag 1E shown in FIG. 5 is a box-shaped package composed of five laminates 10, and includes a laminate 10A forming a bottom portion and laminates 10B and 10C forming a front portion and a rear portion, respectively. and laminates 10D and 10E forming the sides. The sealant layer 12 of each laminate is placed inside the packaging bag 1E, and the edges of adjacent laminates are heat-sealed to form a box-shaped packaging bag 1E.
Moreover, in the packaging bag 1E shown in FIG. , side sealing portions 42 and 43 are formed, and the top side is tapered compared to the bottom side.
The packaging bag 1E has a zipper part 44 that can be opened and closed and a notch part 45 for opening the packaging bag 1E along the upper seal part 41. are provided in part of the side seal portions 42 and 43 of the . As a result, after the upper seal portion 41 is separated from the main body of the packaging bag 1E by the notch portion 45 and opened, the zipper portion 44 can be used to freely open and close.
Here, as indicated by arrows in the figure, the first direction D1 is provided in the direction in which the side seal portions 42 and 43 at both left and right ends face each other (horizontal direction parallel to the chuck portion 44). A second direction D2 is provided in a direction perpendicular to the first direction D1 (vertical direction in which the side seal portions 42 and 43 extend). Therefore, the notch portion N is cut along the first direction D1.
Since the laminates 10B and 10C have a high straight cutting property in the first direction D1, when the packaging bag 1B is opened, when the packaging bag 1B is opened, it can be cut by hand only with the notch portion N as a trigger. It can be cut linearly substantially along the cutting line CL indicated by .

In addition, in any form of the package exemplified above, it is desirable that the ratio of the weight of paper to the entire package is the largest among the materials constituting the package. This is because the proportion of recyclable materials in the package is increased, and the environmental load can be reduced. In addition, in the package of this embodiment, "paper", "resin", and "metal" correspond to the material constituting the package.

The form of the packaging bag is not limited to the form described above, and may be a gusset type or the like.
In addition, the "packaging body" in the present disclosure is a general term for the case where the laminate of the present disclosure is used as a packaging material, and includes not only packaging bags but also container-shaped ones, such as lids. Even if it is a member that constitutes a part of the packaging container, it is within the scope of "packaging body".

The present disclosure will be described in more detail below based on examples.
In addition, in the paper substrate layers 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 structure and straightness evaluation results of Examples and Comparative Examples.
Tensile elongation was measured using JIS-Z-1707. As for the test conditions, first, a strip-shaped test piece having a width of 15 mm in a direction perpendicular to the direction to be measured and a length of 150 mm in the direction to be measured is cut out of the laminate 10 . Both ends of the test piece are clamped by chucks in a tensile tester so that the distance between the chucks is 10 mm. Then, it is pulled in the vertical direction at 50 mm/min until it breaks, and the rate of elongation until it breaks is recorded. The average of 10 trials was taken as the tensile elongation of the laminate.
As a tensile tester, for example, Tensilon STA-115 manufactured by A&D Co., Ltd. can be used.
The tear strength was measured using the JIS-K-7128 B method (Elmendorf method). The number of test sheets was 4, and the average of the maximum tear load of 10 trials was recorded as the tear strength. Specifically, Elmendorf Tear Tester S-01 manufactured by Toyo Seiki Seisakusho Co., Ltd. was used.
The straight cutting performance was evaluated by sensory evaluation when the package was actually opened by hand. A case in which the straight cuttability was very good was rated as "A", a case in which the straight cuttability was inferior to "A" but good was rated as "B", and a case in which the straight cuttability was poor was rated as "C".
Also, in FIG. 6, the following abbreviations are used.
Coffee filter: coffee filter light brown (MIX)
PASLIM: VM001/108CP
PET: polyethylene terephthalate

<Example 1>
In the laminate of Example 1, the paper substrate layer had a tensile elongation rate R1 of 15.9% in the first direction and a tensile elongation rate R2 of 4% in the second direction. Crepe paper with a ratio R of tensile elongation in two directions of 4.0 (coffee filter light brown (MIX): manufactured by Tenma Tokushu Paper Co., Ltd., basis weight 53.1 g/m ² , thickness 0.201 mm, paper density 0.201 mm. 264 g/cm ³ ) was used.
A sealant film was prepared separately from the paper base layer. The sealant film of Example 1 is a sealant layer having a vapor deposition layer, and aluminum vapor deposition CPP (unstretched polypropylene) (CP-VR manufactured by Reiko Co., Ltd., thickness 40 μm) was used.
After applying a solvent-based barrier adhesive (PASLIM VM001/108CP: manufactured by DIC Corporation) to the vapor-deposited layer of the sealant film so as to have a dry thickness of 3 μm, a barrier adhesive layer was formed as an adhesive layer. , and the surface of the paper substrate opposite to the printed layer, and aged at 40°C for 3 days to obtain a laminate.
Using this laminate, a standing pouch type package (see FIG. 4) having 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 of the tear strengths in the second direction to the first direction r was 2.463. As for the results of the sensory evaluation of the straight cutting property of the package, the straight cutting property at the time of opening was very good, and the evaluation was "A".

<Example 2>
The laminate and package of Example 2 were aged at 25° C. for 1 day using an ether-based adhesive (RU3600/H-689 (dry thickness: 3 μm): manufactured by Rock Paint Co., Ltd.). are the same as in Example 1.
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 of the tear strengths in the second direction to the first direction r was 2.559. As for the results of the sensory evaluation of the straight cutting property of the package, the straight cutting property at the time of opening was very good, and the evaluation was "A".

<Example 3>
The laminate and package of Example 3 are the same as those of Example 1 except that they are an ester-based adhesive (RU77T/H-7 (dry thickness: 3 μm): manufactured by Rock Paint Co., Ltd.).
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 of the tear strengths in the second direction to the first direction r was 2.431. As for the results of the sensory evaluation of the straight cutting property of the package, the straight cutting property at the time of opening was very good, and the evaluation was "A".

<Example 4>
The laminate and package of Example 4 are the same as those of Example 1, except that the sealant layer is CPP (unstretched 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 of the tear strengths in the second direction to the first direction r was 2.633. As for the results of the sensory evaluation of the straight cutting property of the package, the straight cutting property at the time of opening was very good, and the evaluation was "A".

<Example 5>
The laminate and package of Example 5 are the same as those of Example 1, except that the sealant layer is 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 of the tear strengths in the second direction to the first direction r was 2.262. As for the results of the sensory evaluation of the straight cutting property of the package, the straight cutting property at the time of opening was very good, and the evaluation was "A".

<Example 6>
In the laminate and package of Example 6, the sealant layer is CPP (unstretched polypropylene) GLC (thickness 40 μm): manufactured by Mitsui Chemicals Tohcello Co., Ltd., and 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. Same as Example 1.
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 of the tear strengths in the second direction to the first direction r was 2.436. As for the results of the sensory evaluation of the straight cutting property of the package, the straight cutting property at the time of opening was very good, and the evaluation was "A".

<Example 7>
In the laminate and package of Example 7, the sealant layer is LLDPE (low density polyethylene) TUX-MCS (thickness 40 μm): manufactured by Mitsui Chemicals Tohcello, Inc., and aluminum foil (8021 material ( Thickness 7 μm): manufactured by Toyo Aluminum Co., Ltd.), and the adhesive is RU77T/H-7 (dry thickness 3 μm): manufactured by Rock Paint Co., Ltd. The same as Example 1.
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 of the tear strengths in the second direction to the first direction r was 2.459. As for the results of the sensory evaluation of the straight cutting property of the package, the straight cutting property at the time of opening was very good, and the evaluation was "A".

<Example 8>
In the laminate and package of Example 8, the paper substrate layer had a tensile elongation rate R1 of 6.3% in the first direction, a tensile elongation rate R2 of 6.9% in the second direction, and Clupak paper having a tensile elongation ratio R of 0.9 between the direction and the second direction (TKS: Tokushu Tokai Paper Co., Ltd., basis weight 50 g/m ² , thickness 0.115 mm, paper density 0.633 g/cm ³ ) It is the same as Example 1 except that .
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 of the tear strengths in the second direction to the first direction r was 1.780. As for the results of the sensory evaluation of the straight cutting property of the package, the straight cutting property at the time of opening was good, and the evaluation was "B".

<Comparative Example 1>
In the laminate and package of Comparative Example 1, the paper substrate layer has a tensile elongation rate R1 of 1.5% in the first direction, a tensile elongation rate R2 in the second direction of 5.2%, and the first Double unbleached kraft paper with a tensile elongation ratio R of 0.3 in the direction and the second direction (Tokai Kraft C: manufactured by Tokushu Tokai Paper Co., Ltd., basis weight 50 g / m ² , thickness 0.077 mm, paper density 0 .653 g/cm ³ ) was used.
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 of the tear strengths in the second direction and the first direction was r was 1.147. As for the sensory evaluation result of the straight cutting property of the package, the straight cutting property at the time of opening was poor, and the evaluation was "C".

<Comparative Example 2>
In the laminate and package of Comparative Example 2, the paper base layer has 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 Single-glazed unbleached kraft paper with a tensile elongation ratio R of 0.8 in the direction and the second direction (Gintake: manufactured by Nippon Paper Industries Co., Ltd., basis weight 51 g / m ² , thickness 0.078 mm, paper density 0.654 g /cm ³ ) is the same 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 of the tear strengths in the second direction and the first direction was r was 1.527. As for the sensory evaluation result of the straight cutting property of the package, the straight cutting property at the time of opening was poor, and the evaluation was "C".

As described above, the laminate and the package according to the present embodiment can be a laminate and the package having excellent straight cutting properties by satisfying the relationship of 0.8≦R≦5.0.
Further, by satisfying the relationship of r≧1.6, the laminate and the package of the present embodiment can more reliably provide the laminate and the package with excellent straight cutting properties.
Various modifications and changes are possible without being limited to the embodiments described above, and they are also within the scope of the present disclosure.

1 (1A, 1B, 1C, 1D, 1E) packaging bag (package)
REFERENCE SIGNS LIST 10 Laminate 11 Paper Base Layer 12 Sealant Layer 13 Vapor Deposition Layer 14 Adhesive Layer

Claims (7)

a paper base layer;
a sealant layer;
an adhesive layer provided between the paper base layer and the sealant layer;
with
The intended cutting direction in the in-plane direction of the paper base layer is the first direction, the direction perpendicular to the first direction is the second direction, and the tensile elongation rate of the paper base layer alone in the first direction ( %) is R1, the tensile elongation rate (%) of the paper base layer alone in the second direction is R2, and R=R1/R2,
0.8≤R≤5.0
A laminate that satisfies the relationship of In the laminate according to claim 1,
5%≤R1≤30%
A laminate that satisfies In the laminate according to claim 1 or claim 2,
When the tear strength of the entire laminate in the first direction is r1, the tear strength of the laminate as a whole in the second direction is r2, and r=r2/r1,
r≧1.6
A laminate that satisfies In the laminate according to any one of claims 1 to 3,
The laminate, wherein the basis weight of the paper base layer is 20 g/m ² or more and 150 g/m ² or less. A package comprising at least a part of the laminate according to any one of claims 1 to 4. In the package according to claim 5,
Equipped with a notch that serves as a trigger for cutting a part of the package,
The package, wherein the notch portion is cut along the first direction. In the package according to claim 5 or claim 6,
A package in which the weight ratio of paper in the whole package is the largest among the materials constituting the package.

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