Packaging material, light-shielding material, packaging bag, and package

Abstract

To provide a packaging material which can suppress deterioration caused by light of a chlorous acid.SOLUTION: A packaging material for forming a packaging bag for storing chlorous acid water or an article containing chlorous acid water has transmittance to light at a wavelength of 200 to 700 nm of 1% or less.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present disclosure relates to a packaging material, a light-shielding material, a packaging bag, and a package. [Background technology]

[0002] Packaging bags are used to contain a variety of products, including food, medical supplies, drugs, etc. The properties of the products contained are diverse, including solids, liquids, and semi-solids, and their characteristics are also diverse. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2020-117233 A Summary of the Invention [Problem to be solved by the invention]

[0004] Here, hypochlorous acid water is a drug that is frequently used as a disinfectant, and is usually sold as a high-concentration aqueous solution.When using, an appropriate amount of hypochlorous acid water is taken out from a container that contains hypochlorous acid water, and the concentration is adjusted as desired, so that the operation is complicated when using.Therefore, the present inventors have come up with the idea of ​​dividing hypochlorous acid water of a concentration suitable for use into a suitable amount of packaging bag, and when they make such a package, they have found that the hypochlorous acid in the package is easily deteriorated by light.

[0005] The present disclosure has been made in consideration of the above circumstances, and aims to provide a packaging material or light-shielding material capable of suppressing deterioration of chlorous acid due to light. 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 packaging material of the present disclosure is a packaging material for forming a packaging bag for storing chlorous acid water or an article containing chlorous acid water, and has a transmittance of 1% or less for light with a wavelength of 200 to 700 nm.

[0007] It is preferable that the packaging material further has a gas barrier layer.

[0008] It is preferable that the packaging material further includes a sealant layer.

[0009] The packaging material preferably includes a light-shielding layer having heat-sealing properties.

[0010] The light-shielding layer preferably contains an inorganic pigment.

[0011] The inorganic pigment is preferably at least one of a black pigment and a white pigment.

[0012] The inorganic pigment is preferably at least one of silica, titanium oxide, alumina, carbon black, and layered minerals.

[0013] The light-shielding layer preferably has a transmittance of 1% or less for light with a wavelength of 200 to 700 nm.

[0014] The packaging material may be a packaging material for forming a packaging bag for containing chlorous acid water.

[0015] The light-shielding material of the present embodiment is a film-like light-shielding material for shading chlorous acid water or an article containing chlorous acid water, and has a transmittance of 1% or less for light having a wavelength of 200 to 700 nm. The packaging material of the present disclosure may contain such a light-shielding material.

[0016] The packaging bag of the present disclosure is formed from the above-described packaging material.

[0017] The package of the present disclosure has chlorous acid water or an article containing chlorous acid water contained in the above-mentioned packaging bag. Effect of the Invention

[0018] According to the present disclosure, it is possible to provide a packaging material or a light-shielding material capable of suppressing deterioration of chlorous acid due to light. In addition, the present disclosure can provide a packaging bag formed from such a packaging material, and a package including the packaging bag. [Brief description of the drawings]

[0019] [Figure 1] FIG. 1 is a cross-sectional view of a light-blocking 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] FIG. 2 is a cross-sectional view of a packaging material according to an embodiment of the present disclosure. [Diagram 5] 1 is a schematic diagram showing a packaging bag according to an embodiment of the present disclosure. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0020] The light-shielding material of the present embodiment is a film-like light-shielding material for shading chlorous acid water or an article containing chlorous acid water, and has a transmittance of 1% or less for light having a wavelength of 200 to 700 nm. With such a light-shielding material, deterioration of chlorous acid due to light can be suppressed.

[0021] It is known that chlorous acid is decomposed by ultraviolet irradiation.However, according to the inventor's intensive research, it has been found that the deterioration of chlorous acid cannot be sufficiently suppressed by simply blocking the ultraviolet rays that are irradiated to chlorous acid water or the article that contains chlorous acid water.That is, chlorous acid is decomposed not only by ultraviolet rays but also by visible light, so in order to store chlorous acid water or the article that contains chlorous acid water for a long period of time, it is also necessary to block visible light.

[0022] 1 shows a cross-sectional view of a light-shielding material 100 according to this embodiment. The light-shielding material 100 has a film (light-shielding layer) that is light-shielding to visible light. The light-shielding material 100 may be composed of only the light-shielding film (light-shielding layer) 101, or may further include other layers.

[0023] The light-shielding layer may be a layer containing an inorganic pigment. 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, titanium oxide, alumina, etc. Examples of the black pigment include carbon black, etc. Other examples of the inorganic pigment include layered minerals such as mica.

[0024] The light-shielding layer may be, for example, a layer having an inorganic pigment and a thermoplastic resin. Such a layer may also function as a heat-fusible layer (sealant layer). The layer having an inorganic pigment and a thermoplastic resin is a layer in which the inorganic pigment is contained within the sealant layer.

[0025] Specific examples of thermoplastic resins 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 blend resins of polyethylene and polybutene, and polypropylene-based resins such as propylene-ethylene random copolymer, propylene-ethylene block copolymer, and propylene-α-olefin copolymer.

[0026] The layer containing an inorganic pigment and a thermoplastic resin may be a film obtained by forming a material in which an inorganic pigment is kneaded into a thermoplastic resin, or a coating film obtained by applying and drying an inorganic ink containing an inorganic pigment, a thermoplastic resin, and a solvent, or the like.

[0027] The light-shielding material may have a plurality of light-shielding layers. For example, the light-shielding material may have a multi-layer structure in which two or more light-shielding layers are laminated. An example of a laminate of two or more layers containing an inorganic pigment and a thermoplastic resin is a laminate of an LLDPE layer (white layer) kneaded with a white pigment and an LLDPE layer (black layer) kneaded with a black pigment, laminated in this order of white-black-white.

[0028] The thickness of the light-shielding layer may be 5 to 150 μm, 15 to 90 μm, or 20 to 80 μm.

[0029] The light-shielding material may have a sealant layer in addition to the light-shielding layer. When the light-shielding material has a sealant layer, the light-shielding material can also be used as a packaging material. The thickness of the sealant layer may be 5 to 150 μm, 15 to 90 μm, or 20 to 80 μm. Examples of materials for the sealant layer include the above-mentioned thermoplastic resins.

[0030] The light-shielding material may have a gas barrier layer. The gas barrier layer is not particularly limited, and may be a layer (vapor deposition layer) on which a metal or an inorganic compound is vapor-deposited. The vapor-deposited layer may be obtained by vapor-depositing aluminum, and aluminum oxide (AlO x ), silicon oxide (SiO x ) (x is, for example, 1.0 to 2.0), and from the viewpoint of resistance to chlorous acid or a salt thereof, the vapor deposition layer may be a layer containing an oxide. When the light-shielding material has a gas barrier layer, it is possible to suppress a decrease in concentration due to the dissipation of chlorous acid.

[0031] The thickness of the vapor-deposited layer may be appropriately set depending on the intended use, but is preferably 30 nm or more, 50 nm or more, and 100 nm or less, 80 nm or less. By setting the thickness of the vapor-deposited layer to 30 nm or more, the continuity of the vapor-deposited layer is easily ensured, and by setting the thickness to 100 nm or less, the occurrence of curling or cracking can be sufficiently suppressed, and sufficient gas barrier performance and flexibility can be easily achieved.

[0032] The light shielding material may have a base film. The base film may be a flexible film. The base film may include, for example, a film-like thermoplastic polymer. 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 thickness of the base film may be 5 to 150 μm, 15 to 90 μm, or 20 to 80 μm.

[0033] The transmittance of the light-shielding material for light with a wavelength of 200 to 700 nm may be 0.9% or less, 0.8% or less, 0.7% or less, or 0.6% or less. Also, the transmittance of the light-shielding layer in the light-shielding material for light with a wavelength of 200 to 700 nm may be 0.9% or less, 0.8% or less, 0.7% or less, or 0.6% or less.

[0034] The light-shielding material may be light-shielding against ultraviolet rays. The transmittance of the light-shielding material for wavelengths of 200 nm or more and less than 400 nm may be 0.5% or less, 0.3% or less, 0.2% or less, 0.1% or less, or substantially 0%. The transmittance of the light-shielding layer in the light-shielding material for light with wavelengths of 200 nm or more and less than 400 nm may be 0.5% or less, 0.3% or less, 0.2% or less, 0.1% or less, or substantially 0%.

[0035] The light-shielding material of this embodiment can be used to shield the hypochlorous acid water or the article containing hypochlorous acid water in the container by wrapping it around the container after the hypochlorous acid water or the article containing hypochlorous acid water is contained in the container. After wrapping the light-shielding material around the container, the wrapped state may be fixed with an adhesive, adhesive tape, or the like. The container is not particularly limited as long as it can contain hypochlorous acid water or the article containing hypochlorous acid water, and may be made of any material such as glass, resin, or metal such as stainless steel. The container may be sealed with a lid such as a screw cap, or the opening may be sealed by welding after the hypochlorous acid water or the article containing hypochlorous acid water is placed in the container.

[0036] The light-shielding material of the present embodiment may be included in the packaging material. That is, the packaging material may be formed from the light-shielding material, and may additionally have other layers. In the case of the packaging material, it may be made into a packaging bag by bagging.

[0037] The packaging material (which may be a light-shielding material) according to this embodiment is a packaging material for forming a packaging bag for containing hypochlorous acid water or an article containing hypochlorous acid water, and may include the above-mentioned light-shielding layer. The packaging material may have a sealant layer and a base film in addition to the light-shielding layer, and the sealant layer may be the outermost layer of the packaging material so as to constitute the innermost layer when the packaging bag is made. The outermost layer on the opposite side to the sealant layer may be a base film. The packaging material may further have a gas barrier layer.

[0038] Fig. 2 shows a cross-sectional view of a packaging material (which may be a light-shielding material) 10 according to this embodiment. In Fig. 2, 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. 2, the sealant layer 3 contains an inorganic pigment together with the thermoplastic resin. In other words, the sealant layer also functions as a light-shielding layer. 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.

[0039] 3 shows a cross-sectional view of another example of the packaging material (which may be a light-shielding material) of this embodiment. The packaging material 20 includes, in this order, a base film 1, an adhesive layer 2, a light-shielding 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 the sealant layer 4 having the light-shielding layer 5 formed on the surface thereof on the adhesive layer 2.

[0040] A cross-sectional view of a packaging material (which may be a light-shielding material) according to this embodiment is shown in Fig. 4. In Fig. 4, a packaging material 30 includes a base film 1, a gas barrier layer 7, an adhesive layer 2, a light-shielding layer 6, and a sealant layer 4, in this order.

[0041] 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. 5 shows an example of the packaging bag of this embodiment. The packaging bag 110 of FIG. 5 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. The storage section can store hypochlorous acid water or an article containing hypochlorous acid water. After storing hypochlorous acid water or an article containing hypochlorous acid water 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 hypochlorous acid water or an article containing hypochlorous acid water in the packaging bag.

[0042] 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↑

[0043] In order to stably maintain chlorous acid (HClO2) for a long period of time, the chlorous acid water 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.

[0044] The pH of the chlorous acid water may be 3.2 to 7.0.

[0045] Examples of articles containing chlorous acid water include porous substrates, fiber substrates, and other substrates impregnated with chlorous acid water. Examples of substrate materials include sheets, films, patches, brushes, nonwoven fabrics, paper, cloth, absorbent cotton, sponges, and the like. The substrate may contain a plurality of these materials.

[0046] In the packaging bag according to one embodiment of the present disclosure, when chlorous acid water 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 chlorous acid water 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 chlorous acid water is measured before sealing, and the chlorous acid water is promptly sealed 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 chlorous acid water 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 sealed.

[0047] Specific examples of the light-shielding material or packaging material include the following. The adhesive sheet has a base film, an adhesive layer, and a sealant layer in this order, and 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. (3) A layer containing an inorganic oxide is provided at least either between the substrate film and the adhesive layer or between the sealant layer and the adhesive layer. In the case of (3), a light-shielding layer may further be provided.

[0048] The present disclosure includes the following exemplary embodiments. [1] A packaging material for forming a packaging bag for containing chlorous acid water or an article containing chlorous acid water, the packaging material having a transmittance of 1% or less for light with a wavelength of 200 to 700 nm. [2] The packaging material of [1] having a gas barrier layer. [3] Packaging material of [1] or [2] including a sealant layer. [4] A packaging material according to any one of [1] to [3], comprising a heat-sealable light-shielding layer. [5] The packaging material according to [4], wherein the light-shielding layer contains an inorganic pigment. [6] The packaging material according to [5], wherein the inorganic pigment is at least one of a black pigment and a white pigment. [7] The packaging material according to [5], wherein the inorganic pigment is at least one of silica, titanium oxide, alumina, carbon black, and layered minerals. [8] The packaging material according to any one of [4] to [7], wherein the light-shielding layer has a transmittance of 1% or less for light having a wavelength of 200 to 700 nm. [9] A packaging material according to any one of [1] to [8] for forming a packaging bag for containing hypochlorous acid water.

[10] A film-like light-shielding material for shading hypochlorous acid water or an article containing hypochlorous acid water, the light-shielding material having a transmittance of 1% or less for light with a wavelength of 200 to 700 nm.

[11] The packaging material of

[10] , comprising the light-shielding material.

[12] A packaging bag formed from any one of the packaging materials described in [1] to [9] and

[11] .

[13] A package in which hypochlorous acid water or an article containing hypochlorous acid water is contained in the packaging bag described in

[12] . EXAMPLES

[0049] (Examples A1 to A5, Comparative Example A1) The following light-shielding materials were prepared as Examples A1 to A5 and Comparative Example A1. Example A1: Takeda Sangyo Co., Ltd., product name: WBW-R (a multi-layer film in which LLDPE with pigments kneaded into it is layered in the order of white (titanium oxide) - black (carbon black) - white (titanium oxide)) Example A2: Milky white LL (Idemitsu Unitech Co., Ltd., Unicrest MS-530CW, thickness: 50 μm, contains titanium oxide as a white pigment) Example A3: White-white LL (a two-layer white ink (Sakata Inx Corporation, Bellcolor 120R White, containing titanium oxide as a white pigment) layer formed on an LLDPE film (thickness 50 μm). Example A4: Black and white LL (a black ink (Riogran ink, manufactured by Toyo Ink Co., Ltd., containing carbon black as a black pigment) layer and a white ink (Bellcolor 120R white, manufactured by Sakata Inx Corporation) layer were formed in this order on an LLDPE film (thickness 50 μm). Example A5: White-white sepia / PET (PET (manufactured by Toray Industries, Inc., product name: Lumirror P60, thickness 12 μm) on which a light-shielding sepia (manufactured by Toyo Ink Co., Ltd., Fine Star Light-shielding Sepia) and two layers of white ink are formed in this order) Comparative Example A1: PET (manufactured by Toray Industries, Inc., product name: Lumirror P60, thickness 12 μm)

[0050] (Measurement of transmittance in the ultraviolet-visible region) The transmittance was measured using a spectrophotometer U-3010 manufactured by Hitachi, Ltd., in accordance with the test method for total light transmittance of plastic transparent materials JIS K 7361-1.

[0051] (Measurement of free chlorine concentration) The chlorous acid water was poured into a 50 ml glass vial with a screw cap and then plugged. The glass vial containing the chlorous acid water was entirely covered with the light-shielding materials of Examples A1 to A5 and Comparative Example A1, and was stored at room temperature (25°C) for three weeks while being irradiated with a light source (Panasonic Corporation, germicidal lamp G15, LED straight tube fluorescent lamp 15 type). The free chlorine concentration of the chlorous acid water immediately before being poured into the glass vial and after three weeks of storage was measured by the method of JIS K 0102 33.4. The results are shown in Table 1.

[0052] [Table 1]

[0053] Example B1 Example 1 An adhesive composition was prepared by mixing an aliphatic polyester polyol (manufactured by Mitsui Chemicals, Inc., product name: Takelac A626) as a base agent, 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 PET film as a base film using a dry laminating device to form an adhesive layer. Next, the above-mentioned WBW-R was laminated as a sealant layer, and the laminate was aged at 40°C for 2 days to obtain a laminate (packaging material). The transmittance of the laminate was measured. The results are shown in Table 2.

[0054] The obtained packaging material was stacked in two so that the sealant layers faced each other, and three pieces were heat sealed to prepare a three-sided bag with a size of 10 cm x 10 cm. 10 ml of chlorous acid water was sealed in the three-sided bag to prepare a package containing chlorous acid water. The free chlorine concentration of the chlorous acid water just before sealing in the three-sided bag and the chlorous acid water taken out of the package after storing the package at 40 ° C for 3 weeks was measured by the method of JIS K 0102 33.4. The results are shown in Table 2.

[0055] (Example B2) A package was produced in the same manner as in Example B1, except that the base film was changed to GL-ARH (manufactured by Toppan Printing Co., Ltd., thickness: 12 μm, film having an alumina deposition layer on a PET base material), and various measurements were carried out. The results are shown in Table 2. The GL-ARH was placed so that the deposition layer faced the adhesive layer.

[0056] (Example B3) A package was produced in the same manner as in Example B2, except that the sealant layer was changed to the milky white LL, and various measurements were carried out. The results are shown in Table 2.

[0057] (Example B4) A package was produced in the same manner as in Example B1, except that the base film was changed to GL-AECF (a film having an alumina deposition layer on a PET base material, manufactured by Toppan Printing Co., Ltd.) and WBW-R was changed to the above-mentioned white-white LLDPE, and various measurements were carried out. The results are shown in Table 2. The GL-AECF was placed so that the deposition layer faced the adhesive layer.

[0058] (Example B5) A package was produced in the same manner as in Example B4, except that the white-white LLDPE was changed to the black-and-white LLDPE, and various measurements were carried out. The results are shown in Table 2.

[0059] Comparative Example 1 A package was prepared in the same manner as in Example B1, except that the sealant layer was changed to LLDPE, and various measurements were carried out. The results are shown in Table 2.

[0060] Comparative Example 2 A package was produced in the same manner as in Comparative Example B1, except that the base film was changed to GL-AECF, and various measurements were carried out. The results are shown in Table 2.

[0061] [Table 2] [Explanation of symbols]

[0062] Reference Signs List 1...base film, 2...adhesive layer, 3, 4...sealant layer, 5...light-shielding layer, 6...light-shielding layer, 7...gas barrier layer, 10, 20, 30, 60, 62...packaging material (light-shielding material), 100...light-shielding material, 101...light-shielding layer, 110...packaging bag, 102...container section.

Claims

1. A packaging material for forming a packaging bag for containing chlorous acid water or an article containing chlorous acid water, A packaging material having a transmittance of 1% or less for light having a wavelength of 200 to 700 nm.

2. The packaging material according to claim 1 , further comprising a gas barrier layer.

3. The packaging material of claim 1 or 2, further comprising a sealant layer.

4. The packaging material according to claim 1 or 2, comprising a light-shielding layer having thermal adhesive properties.

5. The packaging material of claim 4 , wherein the light-shielding layer comprises an inorganic pigment.

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

7. 6. The packaging material according to claim 5, wherein the inorganic pigment is at least one of silica, titanium oxide, alumina, carbon black, and layered minerals.

8. The packaging material according to claim 4, wherein the light-shielding layer has a transmittance of 1% or less for light having a wavelength of 200 to 700 nm.

9. The packaging material according to claim 1 or 2, for forming a packaging bag for containing chlorous acid water.

10. A film-like light-shielding material for shading chlorous acid water or an article containing chlorous acid water, A light-shielding material having a transmittance of 1% or less for light with wavelengths of 200 to 700 nm.

11. The packaging material of claim 10 comprising said light blocking material.

12. A packaging bag formed from the packaging material according to claim 1 or 2.

13. A package in which chlorous acid water or an article containing chlorous acid water is contained in the packaging bag described in claim 12.

Images