Packaging material, packaging bag, and package

Abstract

To provide a packaging material capable of preventing the deterioration of an adhesive layer in a packaging bag when accommodating an article including a sterilizer or disinfectant in the packaging bag.SOLUTION: A packaging material for forming a packaging bag that accommodates an article including a sterilizer or disinfectant includes a substrate film, an adhesive layer, and a sealant layer in the stated order, satisfying at least one of following (1) and (2): (1) the sealant layer contains an inorganic pigment; and (2) a layer containing an inorganic pigment is disposed between the sealant layer and the adhesive layer.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present disclosure relates to packaging materials, packaging pouches, and packages. [Background technology]

[0002] Packaging bags are used to contain various products such as food, medical products, and drugs. The properties of the products contained are varied, such as solids, liquids, and semi-solids, and the properties of the products are also diverse. A common packaging material for forming packaging bags is a multi-layer film, and a well-known one has a base film, an adhesive layer, and a sealant layer in this order (Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent Publication No. 2020-117233 Summary of the Invention [Problem to be solved by the invention]

[0004] Here, an article containing a bactericide or disinfectant for the purpose of killing microorganisms such as bacteria, fungi, and viruses is known. According to the inventors' intensive research, when the bactericide or the bactericide contained in the article containing the bactericide is stored in a packaging bag, it was found that in the conventional packaging bag, the adhesive layer for bonding each layer in the packaging bag is deteriorated by the bactericide. When the adhesive deteriorates, each layer of the laminated film constituting the packaging bag may peel off, and the contents may not be stored properly. In addition, when the adhesive swells due to the action of the bactericide, the appearance of the packaging bag deteriorates.

[0005] The present disclosure has been made in consideration of the above circumstances, and aims to provide a packaging material that can suppress deterioration of an adhesive layer in a packaging bag when an article containing a bactericide or disinfectant is contained in the packaging bag. The present disclosure also aims to provide a packaging bag formed from such a packaging material, and a package including the packaging bag. [Means for solving the problem]

[0006] The present disclosure includes the following embodiments. [1] A packaging material for forming a packaging bag for containing an article containing a germicide or disinfectant, A substrate film, an adhesive layer, and a sealant layer are provided in this order, Packaging material that satisfies at least one of the following (1) and (2). (1) The sealant layer contains an inorganic pigment. (2) A layer containing an inorganic pigment is provided between the sealant layer and the adhesive layer. [2] A substrate film, an adhesive layer, and a sealant layer are provided in this order, 13. A packaging material, wherein the sealant layer comprises 5% by mass or more of an inorganic pigment based on the total mass of the sealant layer. [3] A substrate film, an adhesive layer, and a sealant layer are provided in this order, The packaging material, wherein the sealant layer is an outermost layer and contains an inorganic pigment. [4] A packaging material having a multilayer film in which a base film as an outermost layer, an adhesive layer, a layer containing an inorganic pigment, and a sealant layer are laminated in this order in direct contact with each other. [5] The film has, in this order, a substrate film as an outermost layer, an adhesive layer, a layer containing an inorganic pigment, and a sealant layer, The substrate film may have an inorganic oxide layer deposited on the adhesive side, A packaging material having no light-transmitting base film between the base film and the sealant layer. [6] A packaging material according to any one of [2] to [5] for forming a packaging bag for containing an article containing a germicide or disinfectant. [7] The packaging material according to any one of [1] to [6], wherein the inorganic pigment is at least one of a black pigment and a white pigment. [8] The packaging material according to any one of [1] to [7], wherein the inorganic pigment is at least one selected from the group consisting of silica, titanium oxide, carbon black, and layered minerals. [9] The packaging material according to any one of [1] to [8], wherein the sealant layer containing the inorganic pigment or the layer containing the inorganic pigment has light-shielding properties in the UV region.

[10] A packaging material for forming a packaging bag for containing an article containing a germicide or disinfectant, A substrate film, an adhesive layer, and a sealant layer are provided in this order, A packaging material having a layer containing an inorganic oxide at least either between the base film and the adhesive layer or between the sealant layer and the adhesive layer.

[11] The packaging material according to

[10] , wherein the layer containing an inorganic oxide is a vapor-deposited layer of an inorganic oxide.

[12] The packaging material according to

[10] or

[11] , wherein the inorganic oxide is silica.

[13] The packaging material according to any one of [1] to

[12] , further comprising a light-shielding layer between the base film and the adhesive layer.

[14] The packaging material according to any one of [1] to

[13] , wherein the sealant layer is multi-layered.

[15] The packaging material according to any one of [1] to

[14] , wherein the adhesive layer contains a polyurethane-based adhesive.

[16] A packaging bag formed from any one of the packaging materials [1] to

[15] .

[17] A package in which an article containing a germicide or disinfectant is contained within a packaging bag

[16] .

[18] A packaging bag in which, when a chlorine-based disinfectant having a free chlorine concentration of 200 mg / L or more is sealed in the packaging bag and stored at 40°C for three weeks, the free chlorine concentration of the chlorine-based disinfectant in the packaging bag is 100 mg / L or more. Effect of the Invention

[0007] According to the present disclosure, it is an object of the present disclosure to provide a packaging material capable of suppressing deterioration of an adhesive layer in a packaging bag when an article containing a bactericide or disinfectant is contained in the packaging bag. It is also an object of the present disclosure to provide a packaging bag formed from such a packaging material, and a package including the packaging bag. [Brief description of the drawings]

[0008] [Figure 1] FIG. 2 is a cross-sectional view of a packaging material according to an embodiment of the present disclosure. [Diagram 2] FIG. 2 is a cross-sectional view of a packaging material according to an embodiment of the present disclosure. [Diagram 3] FIG. 2 is a cross-sectional view of a packaging material according to an embodiment of the present disclosure. [Figure 4] 1 is a schematic diagram showing a packaging bag according to an embodiment of the present disclosure. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] (First embodiment) The packaging material of the present embodiment includes a base film, an adhesive layer, and a sealant layer in this order. At least one of the following (1) and (2) is satisfied. The layers (1) and (2) are considered to be capable of preventing the intrusion of free chlorine into the adhesive layer. (1) The sealant layer contains an inorganic pigment. (2) A layer containing an inorganic pigment is provided between the sealant layer and the adhesive layer. Such a packaging material may satisfy at least one of the following conditions (A) to (D). Condition (A): A packaging material comprising, in this order, a base film, an adhesive layer, a layer containing an inorganic pigment, and a sealant layer; a packaging material comprising, in this order, a base film, an adhesive layer, and a sealant layer, wherein the sealant layer contains 5% by mass or more of an inorganic pigment based on the total amount of the sealant layer. Condition (B): A base film, an adhesive layer, and a sealant layer are provided in this order, the sealant layer being the outermost layer and containing an inorganic pigment. Condition (C): A multilayer film is provided in which a base film as the outermost layer, an adhesive layer, a layer containing an inorganic pigment, and a sealant layer are laminated in this order in direct contact with each other. Condition (D): The film has, in this order, a base film as the outermost layer, an adhesive layer, a layer containing an inorganic pigment, and a sealant layer, and the base film may have a layer on which an inorganic oxide layer is vapor-deposited on the adhesive side, and no light-transmitting base film is present between the base film and the sealant layer. The packaging material is a film material (multilayer film material) used for packaging an article, and may be used to form a packaging bag. The packaging material of the present embodiment can be used to form a packaging bag for storing an article containing a bactericide or disinfectant.

[0010] Regarding condition (A), the content of the inorganic pigment in the sealant layer may be 5.3% by mass or more, 5.5% by mass or more, 5.8% by mass or more, 6.0% by mass or more, 6.3% by mass or more, 6.5% by mass or more, 7.0% by mass or more, 7.5% by mass or more, or 8.0% by mass or more based on the total amount of the sealant layer. Regarding condition (A), the content of the inorganic pigment in the sealant layer may be 12% by mass or less, or 10% by mass or less based on the total amount of the sealant layer. The content of the inorganic pigment contained in the sealant layer may be the blending amount of the inorganic pigment in the sealant layer, but it can also be measured by, for example, the method specified in JIS K7250-2:2002, by heating the sealant layer at a high temperature and measuring the weight of the ash remaining after all the organic components are burned.

[0011] In the case of condition (B), the sealant layer containing an inorganic pigment may be one of the outermost layers of the packaging material, and the material of the other outermost layer is not particularly limited. In the cases of conditions (C) and (D), the base film may be one of the outermost layers of the packaging material, and the material of the other outermost layer is not particularly limited. In addition, in the case of condition (D), if the base film has a layer on the adhesive side where an inorganic oxide layer is vapor-deposited, the inorganic oxide layer is regarded as a part of the base film, and is not regarded as a light-transmitting base film between the base film and the sealant layer.

[0012] The base film may be a flexible film. The base film may include one or both of film-like thermoplastic polymers. Examples of the flexible film include biaxially oriented polypropylene (BOPP), polyethylene terephthalate (PET), oriented polyamide (OPA), non-oriented polypropylene (CPP), linear low-density polyethylene (LLDPE), and low-density polyethylene (LDPE). The base film may be, for example, a deposition film (transparent deposition film) having a layer (a layer containing an inorganic oxide) in which an inorganic oxide such as silica is deposited on a PET film. The thickness of the base film may be 5 to 150 μm, 15 to 90 μm, or 20 to 80 μm. When the base film has a deposition layer, the deposition layer may be in contact with the adhesive layer.

[0013] The adhesive layer is not particularly limited, and examples thereof include polyurethane adhesives and polyacrylic adhesives. Examples of polyurethane adhesives include adhesives containing a cured product of a composition containing polyisocyanate and polyol. The polyol may be a polyester polyol. The composition for forming the polyurethane adhesive may further contain an epoxy resin.

[0014] The sealant layer is a layer having thermal adhesiveness. Examples of such layers include layers containing a thermoplastic resin. Specific examples of the thermoplastic resin include ethylene-based resins such as low-density polyethylene resin (LDPE), medium-density polyethylene resin (MDPE), linear low-density polyethylene resin (LLDPE), ethylene-vinyl acetate copolymer (EVA), ethylene-α-olefin copolymer, and ethylene-(meth)acrylic acid copolymer, and polyolefin-based resins such as blended resins of polyethylene and polybutene, and polypropylene-based resins such as propylene-ethylene random copolymer, propylene-ethylene block copolymer, and propylene-α-olefin copolymer. The LLDPE may be produced by a metallocene catalyst. The thickness of the sealant layer may be 5 to 150 μm, 15 to 90 μm, or 20 to 80 μm.

[0015] Fig. 1 shows a cross-sectional view of a packaging material (laminate) 10 according to this embodiment. In Fig. 1, the packaging material 10 includes a base film 1, an adhesive layer 2, and a sealant layer 3, in this order. In the packaging material of Fig. 1, the sealant layer 3 contains an inorganic pigment together with the thermoplastic resin. Such a packaging material 10 can be obtained by forming a layer of an adhesive composition (adhesive layer 2) on the base film 1 by a dry lamination method or the like, and laminating the sealant layer 3 on the adhesive layer.

[0016] When the sealant layer 3 contains an inorganic pigment, the sealant layer 3 may be formed of a material in which the inorganic pigment is kneaded into the above-mentioned thermoplastic resin. Examples of such a material include LLDPE kneaded with a white pigment, LLDPE kneaded with a black pigment, and the like.

[0017] The inorganic pigment is not particularly limited, but is preferably at least one of a black pigment and a white pigment. Examples of the white pigment include silica and titanium oxide. Examples of the black pigment include carbon black. Other examples of the inorganic pigment include layered minerals such as mica. One or more types of inorganic pigments may be used.

[0018] The sealant layer may be a multilayer film. Examples of such a multilayer film include a laminate of two or more layers containing an inorganic pigment and a thermoplastic resin, and a laminate of one or more layers containing an inorganic pigment and a thermoplastic resin and one or more layers containing no inorganic pigment and a thermoplastic resin. An example of a laminate of two or more layers containing an inorganic pigment and a thermoplastic resin is a laminate of LLDPE kneaded with a white pigment and LLDPE kneaded with a black pigment, in the order white-black-white.

[0019] A cross-sectional view of another example of the packaging material of the present embodiment is shown in Fig. 2. The packaging material 20 includes, in this order, a base film 1, an adhesive layer 2, a layer containing an inorganic pigment (inorganic pigment layer) 5, and a sealant layer 4. Such a packaging material 20 can be obtained by forming a layer of an adhesive composition (adhesive layer 2) on the base film 1 by a dry lamination method or the like, and laminating on the adhesive layer 2 the sealant layer 4 having the inorganic pigment layer 5 formed on its surface.

[0020] The layer 5 containing an inorganic pigment is not particularly limited, and may be a layer formed by applying an ink containing an inorganic pigment, a layer on which an inorganic pigment is vapor-deposited, or the like. The inorganic pigment is not particularly limited, but is preferably at least one of a black pigment and a white pigment. Examples of the white pigment include silica and titanium oxide. Examples of the black pigment include carbon black. One or more types of each of the white pigment and the black pigment may be used. In this specification, the layer containing an inorganic pigment does not need to be a heat-sealable layer, and may not include a sealant layer containing an inorganic pigment.

[0021] The ink containing an inorganic pigment may be an ink containing an inorganic pigment and a solvent.

[0022] In the packaging material 20, the sealant layer 4 does not need to contain an inorganic pigment, but may contain an inorganic pigment. When the sealant layer 4 contains an inorganic pigment, the sealant layer 4 may be any of the layers exemplified as the sealant layer 3 described above.

[0023] In the packaging material, it is preferable that the sealant layer containing an inorganic pigment or the layer containing an inorganic pigment has light-shielding properties in the ultraviolet (UV) region. Some bactericides or disinfectants are easily decomposed by UV irradiation. Therefore, by having the sealant layer containing an organic pigment or the layer containing an inorganic pigment have light-shielding properties in the ultraviolet region, the decomposition of the bactericide or disinfectant can be suppressed.

[0024] The packaging bag of this embodiment can be formed by placing the sealant layers of the packaging material face to face and heat sealing them. Fig. 4 shows an example of the packaging bag of this embodiment. The packaging bag 110 of Fig. 4 is formed by placing two packaging materials 60 and 62 face to face and heat sealing the three pieces. The packaging bag 110 has a storage section 102 surrounded by the heat-sealed parts of the three pieces. An article containing a germicide or disinfectant can be stored in the storage section. After storing an article containing a germicide or disinfectant in the storage section, the opening of the packaging bag can be sealed by heat sealing or the like to produce a package that stores an article containing a germicide or disinfectant in the packaging bag.

[0025] The bactericide or disinfectant is not particularly limited as long as it can reduce the population of at least one type of microorganism such as bacteria, fungi, and viruses.Specific examples of the bactericide or disinfectant include cationic bactericides, iodine bactericides, phenolic bactericides, biguanide bactericides, terpenoid bactericides, chlorine bactericides, amphoteric surfactant bactericides, aldehyde compounds, and alcohol compounds.Only one or more of these can be used.The bactericide or disinfectant may be in the form of a solution, particularly in the form of an aqueous solution.

[0026] Examples of chlorine-based disinfectants include hypochlorous acid, chlorous acid, and salts thereof. The chlorine-based disinfectant is not particularly limited as long as it is a disinfectant containing chlorine, and the salt may be, for example, a metal salt, or an alkali metal salt such as a sodium salt. The chlorine-based disinfectant may be in the form of a hypochlorous acid aqueous solution, a hypochlorous acid aqueous solution, or the like, or may be in the form of chlorous acid water described below. Examples of alcohol compounds include ethanol.

[0027] In this specification, chlorous acid water is an aqueous solution produced by the following reaction. First, an aqueous solution in which chloric acid or a chlorate is dissolved is prepared. The aqueous solution is obtained by adding hydrochloric acid to an aqueous solution in which sodium chloride is dissolved, and electrolysis is performed in a membrane-free electrolytic cell under acidic conditions (see formula A below), or by adding sulfuric acid to an aqueous solution of a chlorate to make it strongly acidic, thereby generating chloric acid (see formula B below). Next, hydrogen peroxide is added to cause a reduction reaction to generate chlorous acid (HClO2) in the aqueous solution (see formulas C and D below), thereby obtaining chlorous acid water. The chlorate may be sodium chlorate. When carrying out the reaction of formula B, sulfuric acid may be added so that the pH of the aqueous solution of chloric acid is maintained within the range of 2.3 to 3.4. Formula A: NaCl + 3H2O + 6e - →NaClO3+3H2↑ B formula: 2NaClO3+H2SO4→2HClO3+Na2SO4↓ C formula: 2HClO3+H2O2→2ClO2+2H2O+O2↑ D formula: 2ClO2+H2O2→2HClO2+O2↑

[0028] In order to stably maintain chlorous acid (HClO2) for a long period of time, the disinfectant or sanitizing agent may contain at least one compound selected from the group consisting of inorganic acids, inorganic acid salts, organic acids, and organic acid salts. Examples of inorganic acids include carbonic acid, phosphoric acid, boric acid, and sulfuric acid. Examples of inorganic acid salts include carbonates (including hydrogen carbonates), hydroxides, phosphates, and borates. Specifically, examples of carbonates include sodium carbonate, potassium carbonate, sodium hydrogen carbonate, and potassium hydrogen carbonate. Examples of hydroxides include sodium hydroxide and potassium hydroxide. Examples of phosphates include disodium hydrogen phosphate, sodium dihydrogen phosphate, trisodium phosphate, tripotassium phosphate, dipotassium hydrogen phosphate, and potassium dihydrogen phosphate. Examples of borates include sodium borate and potassium borate. Examples of organic acids include succinic acid, citric acid, malic acid, acetic acid, and lactic acid. Examples of organic acid salts include sodium succinate, potassium succinate, sodium citrate, potassium citrate, sodium malate, potassium malate, sodium acetate, potassium acetate, sodium lactate, potassium lactate, and calcium lactate.

[0029] The pH of the chlorous acid water may be 3.2 to 7.0.

[0030] The article containing a bactericide or disinfectant may be a solution (aqueous solution) of the bactericide or disinfectant, but may be, for example, a porous substrate, a fiber substrate, or other substrate impregnated with a bactericide or disinfectant in the form of a solution. Examples of the substrate material include sheets, films, patches, brushes, nonwoven fabrics, papers, cloth, absorbent cotton, sponges, etc. The substrate may contain a plurality of these materials.

[0031] Bactericides or disinfectants are sometimes sold as highly concentrated solutions (aqueous solutions). When using, an appropriate amount is taken out from a container containing hypochlorous acid water, and the concentration is adjusted as desired, making the operation complicated. Therefore, a bactericide or disinfectant solution (aqueous solution) of a concentration suitable for use may be divided into portions suitable for one use and stored in a packaging bag.

[0032] Second Embodiment The packaging material (laminate) of this embodiment is a packaging material for forming a packaging bag for containing an article containing a germicide or disinfectant, and includes a base film, an adhesive layer, and a sealant layer in this order, and has a layer containing an inorganic oxide between the base film and the adhesive layer and between the sealant layer and the adhesive layer. It is considered that the packaging material of this embodiment can prevent chlorous acid from penetrating into the adhesive layer by having a layer containing an inorganic oxide. In addition, the layer containing an inorganic oxide may be a gas barrier layer. In particular, when the layer containing an inorganic oxide is disposed between the base film and the adhesive layer, it is possible to prevent the volatile germicide or disinfectant from evaporating out of the packaging bag through the packaging bag. When the effect of the germicide or disinfectant on the adhesive is small, a sufficient preservation effect of the germicide or disinfectant can be obtained only from the layer containing an inorganic oxide disposed between the base film and the adhesive layer.

[0033] A cross-sectional view of a packaging material (laminate) according to this embodiment is shown in Fig. 3. In Fig. 3, a packaging material 30 includes a base film 1, an adhesive layer 2, a layer 6 containing an inorganic oxide, and a sealant layer 4 in this order.

[0034] In this embodiment, the materials of the base film, adhesive layer, and sealant layer may be those exemplified in the first embodiment. The sealant layer 4 may not contain an inorganic pigment, but may contain one. When the sealant layer 4 contains an inorganic pigment, the sealant layer 4 may be a layer exemplified as the sealant layer 3 described above. The sealant layer 4 may be multi-layered. The packaging material of this embodiment may have at least one of (1) the sealant layer containing an inorganic pigment and (2) the layer containing an inorganic pigment between the sealant layer and the adhesive layer in the first embodiment, together with the layer containing an inorganic oxide. Examples of packaging materials having such a layer structure include a base film, a layer containing an inorganic oxide, an adhesive layer, and a sealant layer containing an inorganic pigment, in this order, and a base film, a layer containing an inorganic oxide, an adhesive layer, a layer containing an inorganic pigment, and a sealant layer (the sealant layer may contain an inorganic pigment).

[0035] The layer 6 containing an inorganic oxide may be a vapor-deposited layer of an inorganic oxide, a layer formed from an ink containing an inorganic oxide, a layer in which an inorganic oxide is kneaded into a resin, a layer in which a thermosetting resin containing an inorganic oxide is cured, or the like. The inorganic oxide may be an inorganic pigment, or may be a light-transmitting material. Examples of inorganic oxides include silicon oxide (silica, etc.) and alumina.

[0036] The packaging material of this embodiment can be used to manufacture packaging bags and packages in the same manner as in the first embodiment.

[0037] The packaging material of the present embodiment preferably has a light-shielding layer. The light-shielding layer is preferably a layer having light-shielding properties in the UV region. By having the light-shielding layer, decomposition of the bactericide or disinfectant can be suppressed. The light-shielding layer may be disposed in the packaging material so as to be located outside the sealant layer when the packaging bag is made, and may be disposed outside the base film, between the base film and the adhesive layer, or between the adhesive layer and the layer containing an inorganic oxide.

[0038] In the packaging bag according to one embodiment of the present disclosure, when a chlorine-based disinfectant having a free chlorine concentration of 200 mg / L or more is enclosed in the packaging bag and stored at 40° C. for three weeks, the free chlorine concentration of the chlorine-based disinfectant in the packaging bag may be 100 mg / L or more. Such a packaging bag may be the packaging bag according to the first and second embodiments described above. The free chlorine concentration in the chlorine-based disinfectant is measured before the disinfectant is enclosed, and the disinfectant is promptly enclosed in the packaging bag after the measurement. The free chlorine concentration can be measured by JIS K 0102 33.4 (diethyl-p-phenylenediammonium (DPD) spectrophotometry) or a method conforming thereto. The free chlorine concentration after three weeks of storage (free chlorine concentration after storage) is measured by removing the chlorine-based disinfectant from the packaging bag. The packaging bag may be, for example, a three-sided bag of 10 cm×10 cm, and may be heat-sealed on all four sides when the disinfectant is enclosed. The chlorine-based disinfectant may be an aqueous solution of the chlorine-based disinfectant.

[0039] The free chlorine concentration after storage may be 150 mg / L or more, or 200 mg / L or more. The packaging bag may be, for example, a 10 cm x 10 cm three-sided bag, and the four sides may be heat-sealed when the chlorine-based disinfectant is sealed in the packaging bag. The free chlorine concentration (initial free chlorine concentration) of the chlorine-based disinfectant when the chlorine-based disinfectant is sealed in the packaging bag may be 200 to 300 mg / L.

[0040] The packaging bag according to the first and second embodiments may have a transmittance of 0.9% or less, 0.8% or less, 0.7% or less, or 0.6% or less for light with a wavelength of 400 to 700 nm. The packaging bag may have a light-shielding layer having a transmittance of 0.9% or less for light with a wavelength of 400 to 700 nm. The transmittance of the light-shielding layer for light with a wavelength of 400 to 700 nm may be 0.8% or less, 0.7% or less, or 0.6% or less. EXAMPLES

[0041] (Examples 1 to 3) An adhesive composition was prepared by blending an aliphatic polyester polyol (manufactured by Mitsui Chemicals, Inc., product name: Takelac A626) as a base material, a polyisocyanate (manufactured by Mitsui Chemicals, Inc., product name: Takenate A50) as a curing agent, and ethyl acetate as a solvent. The adhesive composition was applied to a substrate film GL-ARH (manufactured by Toppan Printing Co., Ltd., thickness: 12 μm, a film having an alumina deposition layer on a PET substrate) using a dry lamination device to form an adhesive layer. Next, an LLDPE film containing titanium oxide was laminated as a sealant layer. The laminate (packaging material) was obtained by curing at 40° C. for 3 days. The manufacturing method of the LLDPE used in the sealant layer and the content of titanium oxide in each example are shown in Table 1.

[0042] Example 4 The layers were laminated so as to have the following layer structure to obtain a laminate (packaging material).

[0043] Comparative Example 1 A laminate (packaging material) of Comparative Example 1 was obtained in the same manner as in Example 1, except that the sealant layer used was LLDPE that did not contain titanium oxide.

[0044] The layer structures of the packaging materials of Examples 1 to 4 and the Comparative Example are as follows. Example 1: GL-ARH / adhesive layer / LLDPE layer with titanium dioxide Example 2: GL-ARH / adhesive layer / LLDPE layer with titanium dioxide Example 3: GL-ARH / adhesive layer / LLDPE layer with titanium dioxide Example 4: Base film (PET) / light-shielding printing / adhesive layer / GL-RD / adhesive layer / LLDPE layer containing titanium oxide Comparative example 1: GL-ARH / adhesive layer / LLDPE layer GL-RD (a film having a silica vapor deposition layer on a PET substrate) is a barrier film manufactured by Toppan Printing Co., Ltd., and was laminated so that the vapor deposition layer faced the adhesive layer.

[0045] Two of the obtained packaging materials were stacked so that the sealant layers faced each other, and three pieces were heat sealed to prepare a three-sided bag of 10 cm x 10 cm. 20 ml of chlorous acid water (chlorine content 8000 mass ppm) was enclosed in the three-sided bag to prepare a package containing chlorous acid water.

[0046] (Measurement of free chlorine concentration) The chlorous acid water immediately before sealing in the three-sided bag and the package were stored at 40°C, and the free chlorine concentration in the chlorous acid water taken out of the package every month was measured by the method of JIS K 0102 33.4. The free chlorine concentration in the chlorous acid water immediately before sealing in the three-sided bag was 223 mass ppm. The measurement was performed for two samples each, and the average value was calculated. The results are shown in Table 1.

[0047] (Laminate strength measurement) The package was stored at 40°C, and the laminate strength of the laminate constituting the packaging bag was measured every month using the chlorine acid water in the bag according to the method of JIS K 6854. The results are shown in Table 1.

[0048] [Table 1]

[0049] Packages were manufactured in the same manner as in Example 4, except that the chlorous acid water in the three-sided bag was replaced with alcohol, hypochlorous acid water, and sodium hypochlorite aqueous solution. The packages were stored at 40°C, and the appearance and laminate strength were evaluated after two weeks and one month. The results are shown in Table 2. The laminate strength was measured for two samples (n1 and n2) and the average value was calculated.

[0050] [Table 2]

[0051] In Table 2, the fracture mode GL break (PE elongation) indicates that the GL-ARH substrate film broke during the measurement (the LLDPE in the sealant layer stretched without breaking). Also, the appearance "no change" indicates that no visible changes such as swelling or discoloration were observed in the adhesive layer. [Explanation of symbols]

[0052] Reference Signs List 1...base film, 2...adhesive layer, 3, 4...sealant layer, 5...layer containing inorganic pigment, 6...layer containing inorganic oxide, 10, 20, 30, 60, 62...packaging material (laminate), 110...packaging bag, 102...container.

Claims

1. A packaging material for forming a packaging bag for containing an article containing a germicide or disinfectant, A substrate film, an adhesive layer, and a sealant layer are provided in this order, A packaging material that satisfies at least one of the following (1) and (2). (1) The sealant layer contains an inorganic pigment. (2) A layer containing an inorganic pigment is provided between the sealant layer and the adhesive layer.

2. A substrate film, an adhesive layer, and a sealant layer are provided in this order, 13. A packaging material, wherein the sealant layer comprises 5% by mass or more of an inorganic pigment based on the total amount of the sealant layer.

3. A substrate film, an adhesive layer, and a sealant layer are provided in this order, The packaging material, wherein the sealant layer is an outermost layer and contains an inorganic pigment.

4. A packaging material having a multilayer film in which a base film as an outermost layer, an adhesive layer, a layer containing an inorganic pigment, and a sealant layer are laminated in this order in direct contact with each other.

5. The film has, in this order, a substrate film as an outermost layer, an adhesive layer, a layer containing an inorganic pigment, and a sealant layer, The substrate film may have an inorganic oxide layer deposited on the adhesive side, A packaging material having no light-transmitting base film between the base film and the sealant layer.

6. The packaging material according to any one of claims 1 to 5, wherein the inorganic pigment is at least one of a black pigment and a white pigment.

7. The packaging material according to any one of claims 1 to 5, wherein the inorganic pigment is at least one selected from the group consisting of silica, titanium oxide, carbon black, and layered minerals.

8. The packaging material according to any one of claims 1 to 5, wherein the sealant layer containing the inorganic pigment or the layer containing the inorganic pigment is light-blocking in the UV region.

9. A packaging material for forming a packaging bag for containing an article containing a germicide or disinfectant, A substrate film, an adhesive layer, and a sealant layer are provided in this order, A packaging material having a layer containing an inorganic oxide at least either between the base film and the adhesive layer or between the sealant layer and the adhesive layer.

10. The packaging material according to claim 9 , wherein the layer containing an inorganic oxide is a vapor-deposited layer of an inorganic oxide.

11. 11. The packaging material according to claim 9 or 10, wherein the inorganic oxide is silica.

12. The packaging material according to claim 5 , further comprising a light-shielding layer between the base film and the adhesive layer.

13. The packaging material according to any one of claims 1 to 5, 9 and 10, wherein the sealant layer is multi-layered.

14. The packaging material according to any one of claims 2 to 5, for forming a packaging bag for containing an article containing a germicide or disinfectant.

15. The packaging material according to any one of claims 1 to 5, 9 and 10, wherein the adhesive layer comprises a polyurethane-based adhesive.

16. A packaging bag formed from the packaging material according to any one of claims 1 to 5, 9 and 10.

17. A package comprising an article containing a germicide or disinfectant contained in the packaging bag according to claim 16.

18. A packaging bag, in which when a chlorine-based disinfectant having a free chlorine concentration of 200 mg / L or more is sealed in the packaging bag and stored at 40°C for three weeks, the free chlorine concentration of the chlorine-based disinfectant in the packaging bag is 100 mg / L or more.

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