Laminate

Abstract

This invention provides a technology that, when a laminate containing at least one of polypropylene resin and polyethylene resin as a base layer is used as a packaging bag, reduces the amount of residual solvent and makes the contents less transparent. [Solution] The laminate 10 of the present invention comprises, in this order, a first base layer 1 containing at least one of polypropylene resin and polyethylene resin, a pattern layer 2, a white printing layer 3, an intermediate layer 5 containing a metal vapor deposition layer 51 and a second base layer 52, and a sealant layer 7. The white printing layer 3 contains a white pigment and a binder resin, the ratio M2 / M1 of the mass of the white pigment to the mass M1 of the binder resin is 1.5 or more, and the thickness of the white printing layer 3 is in the range of 1 μm to 5 μm.

Description

[Technical Field]

[0001] This invention relates to a laminate. [Background technology]

[0002] Laminated materials used in packaging bags require various characteristics, such as aesthetic appeal, depending on their intended use. For example, Patent Document 1 describes a laminate film with increased whiteness of the base printing layer. This laminate film increases apparent whiteness by lowering the opacity of the base printing layer, thereby blending the silvery-white color of the metal vapor-deposited film adjacent to the base printing layer with the faint white color of the base printing layer.

[0003] Furthermore, as shown in Patent Document 1, for example, polypropylene may be used as the base material for the laminate. [Prior art documents] [Patent Documents]

[0004] [Patent Document 1] Japanese Utility Model Publication No. 56-168338 [Overview of the project] [Problems that the invention aims to solve]

[0005] The present invention aims to provide a technology that, when a laminate containing at least one of polypropylene resin and polyethylene resin as a base layer is used as a packaging bag, reduces the amount of residual solvent and makes the contents less transparent. [Means for solving the problem]

[0006] According to one aspect of the present invention, a laminate is provided comprising, in this order, a first base layer containing at least one of polypropylene resin and polyethylene resin, a pattern layer, a white printing layer, an intermediate layer containing a metal vapor deposition layer and a second base layer, and a sealant layer, wherein the white printing layer contains a white pigment and a binder resin, the ratio M2 / M1 of the mass of the white pigment to the mass M1 of the binder resin is 1.5 or more, and the thickness of the white printing layer is in the range of 1 μm to 5 μm.

[0007] According to another aspect of the present invention, a laminate relating to the above aspect is provided, in which each of the second substrate layer and the sealant layer comprises at least one of a polypropylene resin and a polyethylene resin.

[0008] According to yet another aspect of the present invention, a laminate is provided in which the first substrate layer comprises the polypropylene resin and the first substrate layer is stretched according to any of the above aspects.

[0009] According to yet another aspect of the present invention, the metal vapor deposition layer is provided as a laminate relating to any of the above-mentioned sides facing the sealant layer with the second substrate layer in between.

[0010] According to yet another aspect of the present invention, a laminate is provided relating to any of the above aspects, wherein the white printed layer and the metal vapor deposition layer each have a first opening and a second opening, and at least a portion of the first opening and at least a portion of the second opening overlap.

[0011] According to yet another aspect of the present invention, a packaging bag is provided which includes a laminate relating to any of the above aspects.

[0012] According to yet another aspect of the present invention, a packaged article is provided which includes a packaging bag relating to the above aspect and contents contained therein. [Effects of the Invention]

[0013] According to the present invention, when a laminate containing at least one of a polypropylene resin and a polyethylene resin as a base material layer is used as a packaging bag, there is provided a technique that makes it possible to reduce the amount of residual solvent and make contents less likely to show through. [BRIEF DESCRIPTION OF DRAWINGS]

[0014] [Figure 1] Figure 1 is a cross-sectional view schematically showing a laminate according to a first embodiment of the present invention. [Figure 2] Figure 2 is a view schematically showing a packaged article according to a second embodiment of the present invention. [Figure 3] Figure 3 is a view schematically showing a packaged article according to a third embodiment of the present invention. [MODE FOR CARRYING OUT THE INVENTION]

[0015] Hereinafter, embodiments of the present invention will be described with reference to the drawings. The embodiments described below are more specific examples of any of the above aspects. The matters described below can be incorporated into each of the above aspects alone or in combination of two or more.

[0016] Further, the following embodiments exemplify configurations for embodying the technical idea of the present invention, and the technical idea of the present invention is not limited by the materials, shapes, structures and the like of the constituent members described below. Various modifications can be made to the technical idea of the present invention within the technical scope defined by the claims set forth in the claims.

[0017] Elements having the same or similar functions are denoted by the same reference numerals in the drawings referred to below, and duplicate descriptions are omitted. Therefore, matters mentioned in one embodiment can be applied to other embodiments unless otherwise specified. In addition, the drawings are schematic, and the relationship between dimensions in one direction and dimensions in another direction, the relationship between the dimension of one member and the dimension of another member, and the like may differ from actual ones.

[0018] <First Embodiment> FIG. 1 is a cross-sectional view schematically showing the laminate according to the first embodiment of the present invention. The laminate 10 shown in FIG. 1 includes a first base material layer 1, a pattern layer 2, a white printing layer 3, an adhesive layer 4, an intermediate layer 5, an adhesive layer 6, and a sealant layer 7.

[0019] The first base material layer has light transmittance. The first base material layer is preferably transparent. The first base material layer contains at least one of a polypropylene resin and a polyethylene resin. The polypropylene resin may be homopolypropylene, may be a copolymer such as a random copolymer or a block copolymer, or may be a mixture of the foregoing.

[0020] The resin constituting the first base material layer 1 may be a recycled resin. The recycled resin is at least one of a resin regenerated by mechanical recycling and a resin regenerated by chemical recycling. In mechanical recycling, after pulverizing a resin product or semi-finished product, the pulverized resin product is washed to remove surface stains and foreign substances. Thereafter, the resin is exposed to a high temperature to remove contaminants remaining inside the resin. In chemical recycling, after pulverizing a resin product, the pulverized resin product is washed to remove surface stains and foreign substances. Thereafter, the resin is depolymerized back to an intermediate raw material, the intermediate raw material is purified, and then repolymerized to produce a polymer.

[0021] The polyethylene resin may be a homopolymer of ethylene, or may be a copolymer of ethylene and another monomer.

[0022] Other monomers include, for example, α-olefins. Examples of α-olefins include propylene, 1-butene, 1-pentene, 1-hexene, 1-octene, 1-decene, 1-dodecene, 1-tetradecene, 1-hexadecene, 1-octadecene, 1-eicosene, 3-methyl-1-butene, 4-methyl-1-pentene, or 6-methyl-1-heptene. Polyethylene may also be a copolymer of ethylene with one of vinyl acetate or acrylic acid esters.

[0023] Polyethylene resins include, for example, high-density polyethylene (HDPE), medium-density polyethylene (MDPE), low-density polyethylene (LDPE), linear low-density polyethylene (LLDPE), or very low-density polyethylene (VLDPE).

[0024] Here, high-density polyethylene has a density of 0.942 g / cm³. 3 In summary, medium-density polyethylene has a density of 0.930 g / cm³. 3 More than 0.942g / cm 3 It is less than 0.910 g / cm³, and low-density polyethylene has a density of 0.910 g / cm³. 3 More than 0.930g / cm 3 The density of linear low-density polyethylene is less than 0.910 g / cm³. 3 Above 0.930cm 3 Ultra-low density polyethylene has a density of less than 0.910 g / cm³. 3 It is less than. The density is a value obtained using a method compliant with JIS K7112:1999.

[0025] The melting point of the first substrate layer 1 is preferably in the range of 125°C to 170°C, and more preferably in the range of 130°C to 165°C. The melting point is a value obtained by a method in accordance with JIS K7121-1987.

[0026] The first substrate layer 1 may be an unstretched film or a stretched film. It is preferable that the first substrate layer 1 be a stretched film. When the first substrate layer 1 is a stretched film, it exhibits superior strength. Furthermore, because the first substrate layer 1 is less prone to stretching, its printability is improved. In this specification, the term "film" does not include the concept of thickness.

[0027] When the first base layer 1 is a stretched film, the first base layer 1 may be a uniaxially oriented film or a biaxially oriented film. Preferably, the first base layer 1 is a biaxially oriented polypropylene film. In this case, a laminate 10 with excellent strength, such as tensile strength, can be obtained.

[0028] The pattern layer 2 is a layer formed by printing a pattern onto the first substrate layer 1 using ink. The pattern layer 2 includes, for example, a binder. As the binder, for example, nitrated cotton, cellulose, vinyl chloride-vinyl acetate copolymer, polyvinyl butyral, polyurethane, acrylic, polyesters, or modified versions thereof can be used individually or in combination. The binder may be water-based, solvent-based, or emulsion type, and may be a one-component type or a two-component type using a curing agent. The pattern layer 2 may also be formed by curing a layer formed with a curable ink by irradiation with ultraviolet light or electron beams. The most common method is to use a urethane-based ink and cure it with isocyanate. In addition to the binder, the ink used to form the pattern layer 2 may further contain, for example, pigments, dyes and other colorants, extender pigments, solvents, and various additives that are normally found in inks. Examples of highly versatile pigments include condensed azo, insoluble azo, quinacridone, isoindoline, anthraquinone, imidazolon, cobalt, phthalocyanine, carbon, titanium dioxide, iron oxide, mica, and other pearl pigments.

[0029] The white printing layer 3 comprises a white pigment and a binder resin. The white pigment is, for example, titanium dioxide or zinc oxide. Titanium dioxide is preferred as the white pigment.

[0030] The average particle size of the white pigment is preferably in the range of 50 nm to 1000 nm, and more preferably in the range of 200 nm to 400 nm. As will be described later, although the white printing layer 3 contains a large amount of white pigment, a particularly smooth white printing layer 3 can be obtained when the average particle size of the white pigment is within the above range.

[0031] Here, the average particle size is the median diameter (D50) measured by a laser diffraction / scattering particle size distribution analyzer. The average particle size of the white pigment can be obtained by cross-sectional observation of the white printed layer 3, measuring the particle sizes of multiple particles, and averaging the result. The value obtained in this way is substantially the same as the median diameter (D50) measured by a laser diffraction / scattering particle size distribution analyzer. Therefore, the range of average particle size described above can also be interpreted as the range of average particle size of the white pigment.

[0032] The binder resin is, for example, polyurethane resin, polyester resin, acrylic resin, or nitrate. Polyurethane resin is preferred as the binder resin. When polyurethane resin is used as the binder resin, the adhesive properties are particularly excellent.

[0033] The ratio M2 / M1 of the mass of white pigment to the mass M1 of binder resin is 1.5 or greater. Preferably, the ratio M2 / M1 is in the range of 1.6 to 3.0, and more preferably in the range of 1.7 to 2.3. When the ratio M2 / M1 is within the above range, a packaged article is obtained in which the contents are particularly difficult to see through.

[0034] The thickness of the white printing layer 3 is within the range of 1 μm to 5 μm. Preferably, the thickness of the white printing layer 3 is within the range of 2 μm to 4 μm. When the thickness of the white printing layer 3 is within the above range, a laminate with a particularly low amount of residual solvent can be obtained. If the white printing layer 3 is too thin, the adhesion is not good. Also, it is difficult to obtain a smooth white printing layer 3. If the white printing layer 3 is too thick, the amount of residual solvent increases. Also, it is difficult to dry the white printing layer 3 sufficiently, resulting in poor adhesion.

[0035] The adhesive layer 4 is made of an adhesive that provides the necessary bonding strength, selected appropriately according to the material of the layer to be bonded through it. The adhesive can be selected from materials such as acrylic, polyester, and polyurethane. Usually, due to its cohesive strength, a two-component curing type urethane material that utilizes the reaction of isocyanate and polyol is preferable.

[0036] The intermediate layer 5 is a laminate containing a metal vapor deposition layer 51 and a second substrate layer 52. The metal vapor deposition layer 51 is provided on the second substrate layer 52. The metal vapor deposition layer 51 is made of, for example, aluminum.

[0037] The thickness of the metal deposition layer 51 is preferably in the range of 10 nm to 100 nm, and more preferably in the range of 30 nm to 80 nm.

[0038] It is preferable that the metal vapor deposition layer 51 faces the sealant layer 7 with the second substrate layer 52 in between. In this case, when an observer observes the laminate 10 from the first substrate layer side, the light reflected from the surface of the metal vapor deposition layer 51 is easily perceived by the observer.

[0039] The second base layer 52 is light-transmitting. Preferably, the second base layer 52 is transparent. The second base layer 52 contains, for example, a polyolefin resin. Preferably, the second base layer 52 contains at least one of a polypropylene resin and a polyethylene resin. The polypropylene resin and polyethylene resin contained in the first base layer 1 can be used as the polypropylene resin and polyethylene resin, respectively. Preferably, the material of the second base layer 52 is the same as the material of the first base layer 1. For example, the materials of the first base layer 1 and the second base layer 52 each contain a polypropylene resin.

[0040] The second base layer 52 may be an unstretched film or a stretched film. If the second base layer 52 is a stretched film, it may be a uniaxially oriented film or a biaxially oriented film. Preferably, the second base layer 52 is a biaxially oriented polypropylene film. In this case, a laminate 10 with excellent strength, such as tensile strength, can be obtained.

[0041] The thickness of the second substrate layer 52 is preferably in the range of 5 μm to 60 μm, and more preferably in the range of 12 μm to 40 μm.

[0042] The adhesive layer 6 is the same as the adhesive layer 4 described above.

[0043] The sealant layer 7 includes, for example, a polyolefin resin. Preferably, the sealant layer 7 includes at least one of a polypropylene resin and a polyethylene resin. The polypropylene resin and polyethylene resin included in the first base layer 1 can be used as the polypropylene resin and polyethylene resin, respectively. In one example, the sealant layer 7 is a uniaxially oriented polypropylene film. In another example, the sealant layer 7 is a linear low-density polyethylene film.

[0044] The resin constituting the sealant layer 7 may be recycled resin. The recycled resin is at least one of resin regenerated by mechanical recycling and resin regenerated by chemical recycling. In mechanical recycling, after crushing the resin product or semi-finished product, the crushed resin product is washed to remove surface dirt and foreign matter. Then, the resin is exposed to high temperatures to remove contaminants remaining inside the resin. In chemical recycling, after crushing the resin product, the crushed resin product is washed to remove surface dirt and foreign matter. Then, the resin is returned to the intermediate raw material by depolymerization, and after purifying the intermediate raw material, it is repolymerized to produce a polymer.

[0045] The amount of residual solvent in the laminate 10 is 2.0 mg / m 2 It is preferably less than 1.5 mg / m 2 more preferably less than. The amount of residual solvent is, for example, 0 mg / m 2 more than 0.001 mg / m 2 or more, and 1.0 mg / m 2 or more.

[0046] Each of the second base material layer 52 and the sealant layer preferably contains a polyolefin resin. In this case, a monomaterial laminate 10 can be obtained. The monomaterial laminate 10 has high recyclability. According to one example, the laminate 10 contains a polypropylene resin as the material for each of the first base material layer, the second base material layer 52 and the sealant layer 7. According to another example, the laminate 10 contains a polyethylene resin as the material for each of the first base material layer 1, the second base material layer 52 and the sealant layer 7. These laminates 10 have particularly high recyclability.

[0047] Each of the white print layer 3 and the metal vapor deposition layer 51 may have an opening. At least a part of the opening provided in the white print layer 3 and at least a part of the opening provided in the metal vapor deposition layer 51 overlap each other. In this case, in the packaging bag described later, the contents can be easily checked from the outside of the packaging bag. In addition to the white print layer 3 and the metal vapor deposition layer 51, the pattern layer 2 may also have an opening. In this case, at least a part of the opening provided in the pattern layer 2, at least a part of the opening provided in the white print layer 3, and at least a part of the opening provided in the metal vapor deposition layer 51 overlap each other. In this case, the contents can be particularly easily checked from the outside of the packaging bag.

[0048] The surface of the metal vapor-deposited layer 51 may have an uneven surface structure. In this case, the metal vapor-deposited layer 51 can be given light-scattering properties. When the metal vapor-deposited layer 51 has light-scattering properties, the contents are particularly difficult to see through when the laminate 10 is observed from the first substrate layer 1 side. For example, an uneven surface structure can be formed on the surface of the metal vapor-deposited layer 51 by providing an uneven surface structure on the surface of the second substrate layer 52, and then forming a metal vapor-deposited layer 51 conforming to the uneven surface structure. For another example, an uneven surface structure can be formed on the surface of the metal vapor-deposited layer 51 by providing fine particles on the surface of the metal vapor-deposited layer 51.

[0049] Furthermore, adhesive layers 4 and 6 can be omitted if sufficient adhesive strength can be obtained between the two layers bonded via them. Additionally, by using a layer containing fine particles as adhesive layer 4, light scattering properties may be imparted to the laminate 10.

[0050] <Method for manufacturing laminates> The laminate 10 described above can be manufactured, for example, by the following method. First, a first substrate layer 1 is prepared. Next, a pattern layer 2 is printed on the first substrate layer 1. Then, a coating film is formed on the pattern layer 2, consisting of an ink containing a white pigment, a binder resin, and a solvent. The ratio of the solvent's mass to the ink's mass is, for example, within the range of 40% by mass to 70% by mass.

[0051] Next, the solvent contained in this coating film is evaporated to form the white printed layer 3. This process is carried out, for example, at room temperature.

[0052] Next, an intermediate layer 5 containing a metal vapor deposition layer 51 and a second substrate layer 52 is prepared. Then, the white printing layer 3 and the metal vapor deposition layer 51 are bonded together via an adhesive layer 4.

[0053] Next, prepare the sealant layer 7. Then, bond the sealant layer 7 to the second substrate layer 52 via the adhesive layer 6. The above describes one example of a method for manufacturing the laminate 10.

[0054] <Effects> Packaging bags are sometimes required to have properties that make it difficult to see the contents. One way to meet this requirement is to make the white printed layer thicker, but making the white printed layer thicker tends to increase the amount of residual solvent in the laminate 10. In this case, it may be necessary to improve the working environment. Although it is possible to volatilize the residual solvent by heating the laminate at a high temperature, the inventors have found that when the laminate is heated at a high temperature, shrinkage of the base material layer occurs when materials with low heat resistance, such as polypropylene resin and polyethylene resin, are used as the base layer.

[0055] The laminate 10 described above comprises the white printing layer 3 and the metal vapor deposition layer 51. Therefore, the packaging bag obtained using the laminate 10 has a small amount of residual solvent and the contents are not easily visible. Furthermore, the laminate 10 described above makes it possible to reduce the amount of residual solvent without causing shrinkage of the base layer. In addition, the laminate 10 described above has excellent design because the metal vapor deposition layer 51 assists in the color development of the pattern layer 2.

[0056] <Second Embodiment> Figure 2 is a schematic diagram showing a packaged article according to a second embodiment of the present invention. The packaged article 100A shown in Figure 2 includes a packaging bag 110A and its contents. The contents may be liquid, solid, or a mixture thereof. The contents may be, for example, food or medicine.

[0057] The packaging bag 110A is a standing pouch. The packaging bag 110A includes a pair of main film and bottom film, each of which is made from the laminate 10 described above or cut from it.

[0058] The pair of main films are overlapped so that their sealant layers 7 face each other, and their periphery is heat-sealed to each other except for one end and the area near it. The bottom film is folded in half so that it forms a mountain fold when viewed from the sealant layer 7 side, and at the position of the one end, it is sandwiched between the pair of main films so that the mountain fold faces the other end of the main film. The bottom film is heat-sealed to the pair of main films except for its central part. In addition, the outer surfaces of the bottom film are bonded together at both sides of the bottom of the packaging bag 110A.

[0059] The packaging bag 110A is provided with a notch as an easy-open structure in the portion where the main film parts are heat-sealed. The easy-open structure may be provided so that when the packaged article 100A is opened, the upper corner can be used as the opening. Alternatively, the packaged article 100A may further include an opening member and a lid, which will be described later in the third embodiment.

[0060] <Third Embodiment> Figure 3 is a schematic diagram showing a packaged article according to a third embodiment of the present invention.

[0061] The packaged article 100B shown in Figure 3 includes a packaging bag 110B and its contents. The contents are, for example, the same as those described for packaged article 100A.

[0062] The packaging bag 110B is a gusseted pouch. The packaging bag 110B includes a container body 110B1, a mouthpiece 110B2, and a lid 110B3.

[0063] The container body 110B1 includes a pair of main body films and a pair of side films.

[0064] The pair of main body films are overlapped so that their sealant layers 7 face each other and sandwich a portion of the mouth member 110B2 at one end. The peripheral edges of these main body films are heat-sealed to the mouth member 110B2 at one end and are also heat-sealed to each other in the vicinity. Furthermore, the peripheral edges of these main body films are heat-sealed to each other at the opposite ends, except for the areas on both sides.

[0065] Each of the side films is folded in half so that it forms a mountain fold when viewed from the sealant layer 7 side. These side films are sandwiched between the pair of main films on both sides, with the mountain folds facing each other. A portion of the periphery of each side film is heat-sealed to one side of the main film, and the remaining portion of the periphery is heat-sealed to the other side of the main film. In addition, the outer surfaces of each side film are bonded together at the top and bottom of the packaging bag 110B, respectively. The container body 110B1 may also include a bottom film.

[0066] As described above, the mouth member 110B2 is sandwiched between the main body film and includes a portion that is heat-sealed. The mouth member 110B2 further includes a mouth portion that protrudes outward from the container body 110B1. The mouth portion has a substantially cylindrical shape and is provided with male threads on the outer surface of its side wall. The lid 110B3 has a bottomed cylindrical shape. The lid 110B3 is provided with female threads on the inner surface of its side wall and is screwed into the mouth portion of the mouth member 110B2. [Examples]

[0067] The tests conducted in connection with the present invention are described below.

[0068] <1> Manufacturing of packaging materials (Example 1) First, the laminate 10 shown in Figure 1 was fabricated by the following method. First, a biaxially oriented polypropylene film with a thickness of 20 μm was prepared as the first base material layer 1. Next, a pattern layer 2 was formed on this first base material layer 1. Then, a coating film was formed on the pattern layer 2 consisting of an ink containing 65 parts by mass of white pigment, 35 parts by mass of binder resin, and solvent (NTP-103, manufactured by Toyo Ink Co., Ltd.). Titanium dioxide was used as the white pigment, and urethane resin was used as the binder resin. In this way, a white printing layer 3 was obtained. The thickness of the white printing layer 3 was 3 μm. In this way, an intermediate was obtained in which a pattern layer and a white printing layer were formed on the first base material layer.

[0069] Next, a laminate was prepared as the intermediate layer 5, comprising a biaxially oriented polypropylene film and an aluminum vapor-deposited layer provided on this film. The thicknesses of the biaxially oriented polypropylene film and the aluminum vapor-deposited layer were 18 μm and 60 nm, respectively.

[0070] Next, the white printing layer 3 and the metal vapor deposition layer 51 were bonded together via the adhesive layer 4. Then, a film made of linear low-density polyethylene was prepared as the sealant layer 7. Next, the sealant layer 7 and the intermediate layer 5 were bonded together via the adhesive layer 6. The same adhesive layer 6 was used as the adhesive layer 4. As described above, the laminate according to Example 1 was fabricated.

[0071] Next, a packaged item was prepared using the resulting laminate. A red liquid was used as the contents.

[0072] (Comparative Example 1) A packaged article according to Comparative Example 1 was prepared in the same manner as in Example 1, except that the mass of the white pigment and the mass of the binder resin in the white printing layer were changed to 50 parts by mass.

[0073] (Comparative Example 2) A packaged article according to Comparative Example 2 was prepared in the same manner as in Example 1, except that the metal vapor deposition layer 51 was omitted.

[0074] (Comparative Example 3) A packaged article according to Comparative Example 3 was prepared using the same method as in Example 1, except that the thickness of the white printing layer 3 was changed from 3 μm to 6 μm.

[0075] <2> evaluation (2.1) Appearance The appearance of each packaged article in Example 1 and Comparative Examples 1 to 3 was evaluated according to the following criteria. A: Neither the color of the contents nor the liquid level could be confirmed. B: Although the color of the contents could not be confirmed, the liquid level could be confirmed. C: The color of the contents was visible through the material.

[0076] (2.2) Residual solvent The amount of residual solvent was measured for the intermediates related to Example 1 and Comparative Examples 1 to 3. Specifically, first, a rectangular fragment with a short side dimension of 50 mm and a long side dimension of 100 mm was cut from the intermediate. Next, the obtained fragment was sealed in a 20 mL vial and the vial was heated at 80°C for 20 minutes. Next, the gas in the headspace was collected using a gas-tight syringe. Then, the collected gas was analyzed by gas chromatography-mass spectrometry.

[0077] The results of the above evaluation are summarized in Table 1 below.

[0078] [Table 1]

[0079] In the "Metal Vapor Deposition Layer" column of Table 1, "Y" indicates the presence of a metal vapor deposition layer, and "N" indicates the absence of a metal vapor deposition layer. Furthermore, in the "Residual Solvent" column, "A" indicates a residual solvent amount of 2.0 mg / m². 2 This indicates that the amount was less than 2.0 mg / m², and "B" means that the amount of residual solvent was 2.0 mg / m². 2 This indicates that the above was the case. [Explanation of Symbols]

[0080] 1...First base material layer, 2...Pattern layer, 3...White printing layer, 4...Adhesive layer, 5...Intermediate layer, 6...Adhesive layer, 7...Sealant layer, 10...Laminate, 51...Metal vapor deposition layer, 52...Second base material layer, 100A...Packaging article, 100B...Packaging article, 110A...Packaging bag, 110B...Packaging bag, 110B1...Container body, 110B2...Opening member, 110B3...Lid.

Claims

1. The material comprises, in this order, a first base layer containing at least one of polypropylene resin and polyethylene resin, a pattern layer, a white printing layer, an intermediate layer containing a metal vapor deposition layer and a second base layer, and a sealant layer. The white printing layer comprises a white pigment and a binder resin, and the ratio M2 / M1 of the mass of the white pigment to the mass M1 of the binder resin is 1.5 or more. The laminate has a white printed layer thickness ranging from 1 μm to 5 μm.

2. The laminate according to claim 1, wherein each of the second substrate layer and the sealant layer comprises at least one of a polypropylene resin and a polyethylene resin.

3. The laminate according to claim 1, wherein the first base layer contains the polypropylene resin and the first base layer is stretched.

4. The laminate according to claim 1, wherein the metal vapor deposition layer faces the sealant layer with the second substrate layer in between.

5. The laminate according to claim 1, wherein the white printing layer and the metal vapor deposition layer each have a first opening and a second opening, and at least a portion of the first opening and at least a portion of the second opening overlap.

6. A packaging bag comprising the laminate according to any one of claims 1 to 5.

7. A packaged article comprising the packaging bag described in claim 6 and the contents contained therein.

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