Odour-absorbing laminated film

Abstract

To provide an odour-absorbing laminated film that allows ease of manufacture and exhibits excellent film properties while achieving superior absorption of odours selected from ammonia odour and amine odour.SOLUTION: An odour-absorbing laminated film comprising, in this order, a base layer, an odour-absorbing layer, and a sealant layer, wherein the odour-absorbing layer contains nanozeolite and is used for absorbing odours selected from ammonia odour and amine odour.SELECTED DRAWING: None

Description

[Technical Field]

[0001] The present invention relates to an odor-absorbing laminate film that is used, for example, in packaging bags and is used to absorb odors selected from ammonia odors and amine odors. [Background technology]

[0002] Supplements containing fish-derived ingredients such as fish oil and collagen may develop an amine odor due to oxidation, while animal-derived foods may develop an ammonia odor due to the breakdown of nitrogen compounds such as proteins and free amino acids through heat sterilization or deterioration over time.

[0003] Therefore, attempts have been made to impart the property of absorbing ammonia odors and amine odors to the films that make up the packaging bags for these supplements, foods, etc.

[0004] For example, Patent Document 1 discloses a deodorizing composition containing an aluminum silicate compound powder and a magnesium oxide powder, and explains that the composition is effective as a deodorizing agent for ammonia, trimethylamine, etc., and can be applied to food packaging.

[0005] Furthermore, Patent Document 2 discloses an odor-trapping adhesive resin composition containing zinc oxide, and explains that by using this to bond together films that make up packaging bags for retort foods, the packaging bags can be made to exhibit deodorizing functions. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Japanese Patent Application Laid-Open No. 2000-189790 [Patent Document 2] Japanese Patent Publication No. 2020-164587 Summary of the Invention [Problem to be solved by the invention]

[0007] Incorporating a deodorizing composition such as that described in Patent Document 1 into any of the layers constituting a laminated film for packaging bags is thought to be an effective means for adsorbing and eliminating odors. However, this method requires kneading the deodorizing composition into a resin to produce a deodorizing film. Therefore, packaging bags containing this deodorizing film have problems such as a complicated manufacturing process and a lack of versatility in the produced deodorizing film.

[0008] In contrast, as in Patent Document 2, a method in which an adhesive containing a deodorizer is prepared, the adhesive is used to manufacture a laminated film for packaging bags, and a deodorizing adhesive layer is formed between the layers is simple and is thought to not impair the versatility of the film that constitutes the laminated film.

[0009] However, deodorizers that can be used in packaging bags are generally commercially available as large particles. Therefore, adding a commercially available deodorizer to an adhesive results in insufficient coating properties, and the resulting deodorizing adhesive layer lacks smoothness, resulting in poor adhesion to adjacent layers and poor appearance of the packaging bag. Furthermore, layers containing large particles lose transparency, resulting in poor visibility of the contents of packaging bags containing such layers. Furthermore, the zinc oxide disclosed in Patent Document 2 has insufficient absorption of nitrogen compound odors such as ammonia odor and amine odor.

[0010] Therefore, an object of the present invention is to provide a laminated film that is easy to produce, has excellent film properties, and has excellent odor absorption properties selected from ammonia odor and amine odor. [Means for solving the problem]

[0011] The present invention is as follows.

[0012] Aspect 1: A device including a substrate layer, an odor absorbing layer, and a sealant layer in this order, The odor absorbing layer comprises nano zeolite, Used to absorb odors selected from ammonia odor and amine odor, Laminated film for absorbing odors. <<Aspect 2>> The average particle size of the nano zeolite is 5 nm or more and 500 nm or less, The average particle size is a particle size at which the cumulative mass ratio is 50% in a particle size distribution obtained by a laser diffraction method measured in accordance with JIS Z8825:2022. The laminate film according to embodiment 1. Aspect 3: The laminate film according to aspect 1, wherein the nanozeolite has an SAR of 20 or less. Aspect 4: The laminate film according to aspect 2, wherein the nanozeolite has an SAR of 20 or less. Aspect 5: The laminated film according to aspect 1, wherein the nanozeolite is a nanozeolite doped with a transition metal. Aspect 6: The laminated film according to aspect 2, wherein the nanozeolite is a nanozeolite doped with a transition metal. Aspect 7: The laminate film according to aspect 5 or 6, wherein the transition metal is one or more transition metals selected from Ag, Cu, and Zn. Aspect 8: The laminate film according to aspect 7, wherein the transition metal is Cu. Aspect 9: The laminate film according to any one of aspects 1 to 6, wherein the odor absorbing layer is an adhesive layer containing the nanozeolite. Aspect 10: The laminate film according to any one of aspects 1 to 6, wherein the odor absorbing layer is a printed layer containing the nanozeolite. Aspect 11: The laminate film of any one of aspects 1 to 6, further comprising one or two layers selected from a barrier layer and a reinforcing layer between the substrate layer and the odor absorbing layer. Aspect 12: An odor-absorbing packaging bag comprising the laminate film according to any one of aspects 1 to 6. Aspect 13: A packaging bag according to aspect 12, for packaging supplements. <<Aspect 14>> A packaging bag containing contents, comprising the packaging bag described in Aspect 12 and its contents. <<Aspect 15>> A packaging bag containing contents as described in Aspect 14, wherein the contents are supplements. Aspect 16 includes nano zeolite and an adhesive, Used to absorb odors selected from ammonia odor and amine odor, Odor absorbing adhesive. Aspect 17: A composition comprising nanozeolite and a resin, Used to absorb odors selected from ammonia odor and amine odor, Odor absorbing ink. [Effects of the Invention]

[0013] According to the present invention, there is provided an odor-absorbing laminate film that is easy to produce, has excellent film properties, and excels in properties such as deodorizing properties for ammonia odor and amine odor, and is used to absorb odors selected from ammonia odor and amine odor. DETAILED DESCRIPTION OF THE INVENTION

[0014] The laminated film of the present invention is a substrate layer, an odor absorbing layer, and a sealant layer in this order; The odor absorbing layer contains nano zeolite, Used to absorb odors selected from ammonia odor and amine odor, It is a laminated film for absorbing odors.

[0015] In the present invention, nanozeolite is used as a deodorizer for ammonia odor and amine odor.

[0016] Nanozeolite has excellent adsorption properties for ammonia odors and amine odors. Furthermore, because nanozeolite has a small particle size, odor-absorbing layers containing nanozeolite have excellent smoothness and can be made thin. The odor-absorbing laminate film of the present invention, which includes such an odor-absorbing layer, can be suitably used for packaging bags for contents that may emit odors selected from ammonia odors and amine odors, without impairing the properties of the laminate film.

[0017] In the present invention, the nanozeolite may be a nanozeolite doped with a transition metal. The nanozeolite doped with a transition metal has an extremely high affinity with polar compounds and an expanded pore size, and therefore is preferable because it has even better adsorption properties for ammonia and amines.

[0018] The odor-absorbing laminate film of the present invention comprises a substrate layer, an odor-absorbing layer, and a sealant layer in this order, and may further comprise one or two layers selected from a barrier layer and a reinforcing layer between the substrate layer and the odor-absorbing layer.

[0019] Each element constituting the odor absorbing laminate film of the present invention will be described below in order.

[0020] Odor absorbing layer The odor absorbing layer is a layer containing nano-zeolite. This odor absorbing layer may be an adhesive layer containing nano-zeolite or a printed layer containing nano-zeolite.

[0021] <Nano Zeolite> The zeolite contained in the odor absorbing layer is nano-zeolite with a small particle size. The average particle size of the nano-zeolite may be, for example, 5 nm or more, 10 nm or more, 20 nm or more, 25 nm or more, 30 nm or more, 35 nm or more, or 40 nm or more, and may be, for example, 500 nm or less, 400 nm or less, 300 nm or less, 250 nm or less, 200 nm or less, 150 nm or less, 100 nm or less, or 80 nm or less.

[0022] The above average particle size is a particle size at which the cumulative mass percentage is 50% in the particle size distribution obtained by laser diffraction method measured in accordance with JIS Z8825:2022.

[0023] The nanozeolite contained in the odor absorbing layer may be a hydrophilic nanozeolite. The hydrophilicity of a zeolite is indicated by the silica-alumina ratio (SAR, SiO2 / Al2O3 molar ratio), with the smaller this value, the higher the hydrophilicity, and the higher this value, the higher the hydrophobicity. The SAR of the nanozeolite of the present invention may be 20 or less, 15 or less, 10 or less, 8.0 or less, 5.0 or less, 3.0 or less, or 2.0 or less. There is no lower limit for the SAR, but generally, zeolites with excessively low SAR are difficult to synthesize. From this perspective, the SAR of the nanozeolite contained in the odor absorbing layer of the present invention may be 0.8 or more, 0.9 or more, or 1.0 or more.

[0024] The nanozeolite contained in the odor absorbing layer may have pores defined by eight-membered rings, and its framework structure may be, for example, AEI, AFT, AFX, CHA, DDR, ERI, ITE, ITW, KFI, LEV, LTA, MER, PAU, RHO, UFI, etc.

[0025] The nano-zeolite contained in the odor absorbing layer may be a nano-zeolite doped with a transition metal. Transition-metal-doped zeolite has an extremely high affinity for polar compounds and an expanded pore size, making it particularly excellent at adsorbing ammonia and amines.

[0026] The transition metal doped in the nanozeolite may be, for example, V, Cr, Mn, Fe, Co, Ni, Cu, Nb, Mo, Ru, Rh, Pd, Ag, Ce, Zn, etc., and may particularly be one or more selected from Ag, Cu, and Zn. The transition metal doped in the nanozeolite may particularly be Cu.

[0027] The doping amount of the transition metal may be, for example, 10 mol% or more, 15 mol% or more, 20 mol% or more, 25 mol% or more, 30 mol% or more, 40 mol% or more, 50 mol% or more, or 55 mol% or more, or may be less than 100 mol%, 95 mol% or less, 90 mol% or less, 80 mol% or less, 70 mol% or less, 60 mol% or less, 55 mol% or less, 50 mol% or less, or 45 mol% or less, relative to the Al atoms contained in the nanozeolite.

[0028] When the transition metal is Ag, the doping amount may be, for example, 20 mol% or more or 25 mol% or more, and, for example, 60 mol% or less, or 55 mol% or less, relative to the Al atoms contained in the nanozeolite. When the transition metal is Cu, the doping amount may be, for example, 50 mol% or more or 55 mol% or more, and, for example, less than 100 mol% or 95 mol% or less, relative to the Al atoms contained in the nanozeolite. When the transition metal is Zn, the doping amount may be, for example, 10 mol% or more or 15 mol% or more, and, for example, 50 mol% or less, or 45 mol% or less, relative to the Al atoms contained in the nanozeolite.

[0029] Doping of the nanozeolite with a transition metal may be carried out, for example, by known ion exchange methods.

[0030] <Odor absorbing layer, which is an adhesive layer containing nano-zeolite> As mentioned above, the odor absorbing layer in the present invention may be an adhesive layer containing nanozeolite or a printed layer containing nanozeolite.

[0031] The content of nanozeolite in the odor absorbing layer, which is an adhesive layer, may be, for example, 1.0 mass% or more, 2.0 mass% or more, 3.0 mass% or more, or 4.0 mass% or more, based on the total mass of the odor absorbing layer, and may be 15.0 mass% or less, 12.0 mass% or less, 10.0 mass% or less, 8.0 mass% or less, 6.0 mass% or less, or 5.0 mass% or less.

[0032] The odor absorbing layer, which is an adhesive layer containing nano zeolite, may contain optional components other than nano zeolite. The optional components contained in the odor absorbing layer, which is an adhesive layer, may be, for example, an adhesive and other optional components. Commercially available adhesives often contain solvents. However, even in such cases, the solvent in the adhesive is removed after the odor absorbing laminate film is produced. Therefore, the odor absorbing layer, which is an adhesive layer, is substantially solvent-free.

[0033] The adhesive contained in the odor absorbing layer, which is an adhesive layer, may be appropriately selected from adhesives known for packaging bags, particularly dry lamination adhesives. The adhesive may be selected from, for example, ester-based adhesives, ether-based adhesives, etc. The adhesive contained in the odor absorbing layer may particularly be a two-component ester-based adhesive. Two-component ester-based adhesives have high heat resistance and are applicable, for example, when heat sterilization of the contents is required.

[0034] The adhesive content in the odor absorbing layer may be, for example, 75% by weight or more, 80% by weight or more, 85% by weight or more, 88% by weight or more, or 90% by weight or more, based on the total weight of the odor absorbing layer, and may be, for example, 99% by weight or less, 97% by weight or less, 95% by weight or less, 93% by weight or less, or 90% by weight or less.

[0035] The odor absorbing layer, which is an adhesive layer, contains nano zeolite and may contain an adhesive. This odor absorbing layer may also contain other optional components, such as fillers, colorants, antifoaming agents, and antioxidants.

[0036] The odor absorbing layer, which is an adhesive layer, in the odor absorbing laminate film of the present invention is a thin layer, but has excellent ability to adsorb odors selected from ammonia and amines.

[0037] The coating amount of the odor absorbing layer, which is an adhesive layer, is, for example, 0.7 g / m as a mass per unit area. 2 More than 0.8g / m 2 More than 1.0g / m 2More than 2.0g / m 2 or more, or 3.0 g / m 2 or more, for example, 10.0 g / m 2 Below 8.0g / m 2 Below 5.0g / m 2 Below 4.0g / m 2 Below 3.0g / m 2 Below 2.0g / m 2 or less, or 1.5 g / m 2 It may be the following:

[0038] The thickness of the odor absorbing layer, which is an adhesive layer, may be generally 0.1 μm or more, or 1 μm or more, and may be 5 μm or less, or 10 μm or less.

[0039] <Odor absorbing layer, a printed layer containing nano-zeolite> The odor absorbing layer, which is a printed layer containing nanozeolite, may contain optional components other than nanozeolite. The optional components contained in the odor absorbing layer, which is a printed layer, may be, for example, resins and other optional components. Commercially available inks often contain solvents. However, even in such cases, the solvent in the ink is removed after the odor absorbing laminate film is produced. Therefore, the odor absorbing layer, which is a printed layer, is substantially solvent-free.

[0040] The content of nanozeolite in the odor absorbing layer, which is a printed layer, may be, for example, 15% by mass or more, 20% by mass or more, 25% by mass or more, or 30% by mass or more, based on the total mass of the odor absorbing layer, and may be 70% by mass or less, 60% by mass or less, 50% by mass or less, 45% by mass or less, 40% by mass or less, or 35% by mass or less.

[0041] The resin contained in the odor absorbing layer, which is a printed layer, has the function of maintaining the layer structure of the odor absorbing layer and dispersing and retaining the nano zeolite.

[0042] The resin may be one or more selected from, for example, polyurethane resin, (meth)acrylic resin, polyamide resin, nitrocellulose resin, chlorinated polyolefin resin, vinyl chloride-vinyl acetate copolymer resin, and the like.

[0043] The resin content in the odor absorbing layer may be, for example, 30% by mass or more, 40% by mass or more, 50% by mass or more, 55% by mass or more, 60% by mass or more, or 65% by mass or more, based on the total mass of the odor absorbing layer, and may be, for example, 85% by mass or less, 80% by mass or less, 75% by mass or less, or 70% by mass or less.

[0044] The odor absorbing layer, which is a printed layer, contains nanozeolite and may contain a resin. The odor absorbing layer may also contain other optional components. The other optional components in the odor absorbing layer, which is a printed layer, may be, for example, a filler, a colorant, a defoaming agent, an antioxidant, etc.

[0045] The odor absorbing layer, which is a printed layer, in the odor absorbing laminate film of the present invention is an absorbing layer that has excellent ammonia and amine adsorption properties despite being a thin layer.

[0046] The coating amount of the odor absorbing layer, which is a printed layer, is, for example, 0.3 g / m as a mass per unit area. 2 More than 0.5g / m 2 More than 0.7g / m 2 or more, or 0.8 g / m 2 or more, for example, 15.0 g / m 2 Below, 12.0g / m 2 Below, 10.0g / m 2 Below 8.0g / m 2 Below 5.0g / m 2 Below 4.0g / m 2 Below 3.0g / m 2 Below 2.0g / m 2 or less, or 1.5 g / m 2 It may be the following:

[0047] The thickness of the odor absorbing layer, which is a printed layer, may be generally 0.1 μm or more, or 1 μm or more, and may be 5 μm or less, or 10 μm or less.

[0048] Advantages of the odor absorbing layer of the present invention In conventional technologies, when a deodorant is contained in an adhesive layer or a printed layer, the deodorant adsorbs the organic solvent contained as a solvent in the adhesive or ink, blocking the adsorption sites for unpleasant odors. As a result, in conventional technologies, packaging bags obtained by incorporating a deodorant in an adhesive layer or a printed layer were unable to exhibit the desired deodorizing function and had insufficient deodorizing properties.

[0049] The zeolite used as a deodorizer in the present invention may have a low SAR and be hydrophilic. In this case, the nanozeolite maintains its deodorizing performance without being affected by the organic solvent contained in the adhesive or ink. Therefore, the adhesive layer or printed layer of this embodiment can be easily formed by a conventional coating method, yet has excellent absorption properties for odors selected from ammonia odor and amine odor.

[0050] 《Base material layer》 The substrate layer may be made of a material appropriately selected from materials that can exhibit the required physical properties when made into a packaging bag, such as one or more materials selected from polyethylene terephthalate, polypropylene, nylon, paper, aluminum foil, etc.

[0051] The thickness of the substrate layer may be appropriately set depending on the type of material constituting the substrate layer, the purpose of the packaging bag to which the odor-absorbing laminate film of the present invention is applied, etc. The thickness of the substrate layer may be, for example, 5 μm or more, 7 μm or more, 10 μm or more, or 12 μm or more, and may be 50 μm or less, 40 μm or less, 30 μm or less, 20 μm or less, or 15 μm or less.

[0052] <Sealant layer> The sealant layer has heat-sealing properties and functions to form and maintain the shape of the packaging bag and seal the contents. The sealant layer may be made of, for example, polyolefin. When the odor-absorbing laminate film of the present invention is intended to heat-treat the contents, the sealant layer is preferably made of unstretched polypropylene, which has excellent heat-sealing properties and heat resistance. On the other hand, when the odor-absorbing laminate film of the present invention is not intended to heat-treat the contents, there are no limitations on the sealant layer in terms of heat resistance, and general polyolefins such as LDPE, LLDPE, polypropylene, etc. can be used.

[0053] The thickness of the sealant layer may be appropriately set depending on the type of material constituting the sealant layer, the purpose of the packaging bag to which the odor-absorbing laminate film of the present invention is applied, etc. The thickness of the sealant layer may be, for example, 10 μm or more, 20 μm or more, 30 μm or more, or 40 μm or more, and may be 120 μm or less, 100 μm or less, 80 μm or less, 60 μm or less, or 50 μm or less.

[0054] Barrier Layer The barrier layer has the role of protecting the contents of the packaging bag from the environment outside the bag, and may have the function of blocking, for example, oxygen, moisture, light, etc. The barrier layer may be made of, for example, aluminum foil, metal-deposited nylon film, silica-deposited nylon film, metal-deposited polyethylene terephthalate film, silica-deposited polyethylene terephthalate film, etc.

[0055] The thickness of the barrier layer may be appropriately set depending on the type of material constituting the barrier layer, the purpose of the packaging bag to which the odor-absorbing laminate film of the present invention is applied, etc. For example, when the barrier layer is an aluminum foil, the thickness may be, for example, 3 μm or more, 4 μm or more, 5 μm or more, or 7 μm or more, and may be 20 μm or less, 18 μm or less, 15 μm or less, 12 μm or less, or 10 μm or less.

[0056] Reinforcement Layer The reinforcing layer has the role of imparting strength, durability, etc. to the packaging bag. The reinforcing layer may be made of, for example, nylon, polypropylene, polyethylene terephthalate, etc. Stretched products of these materials may also be used as the reinforcing layer in the present invention.

[0057] The thickness of the reinforcing layer may be appropriately set depending on the type of material constituting the reinforcing layer, the purpose of the packaging bag to which the odor-absorbing laminate film of the present invention is applied, etc. The thickness of the reinforcing layer may be, for example, 5 μm or more, 7 μm or more, 10 μm or more, or 12 μm or more, and may be 50 μm or less, 40 μm or less, 30 μm or less, 20 μm or less, or 15 μm or less.

[0058] <Layer structure of odor absorbing laminated film> The odor-absorbing laminate film of the present invention comprises at least the above-described substrate layer, odor-absorbing layer, and sealant layer in this order.

[0059] The odor absorbing laminate film of the present invention may further include one or two layers selected from a barrier layer and a reinforcing layer between the substrate layer and the odor absorbing layer. In this case, the laminate film may have the following layering order, for example: a base layer, a barrier layer, a reinforcing layer, an odor absorbing layer, and a sealant layer in this order; The order may be a substrate layer, a barrier layer, an odor absorbing layer, a reinforcing layer, and a sealant layer.

[0060] A laminated film comprising a base layer, a barrier layer, a reinforcing layer, an odor absorbing layer, and a sealant layer in this order has extremely high absorption capacity for odors selected from ammonia odors and amine odors, since the odor absorbing layer and the contents are in contact only through the sealant layer (and the laminate adhesive layer).

[0061] On the other hand, a laminate film comprising a base layer, a barrier layer, an odor absorbing layer, a reinforcing layer, and a sealant layer in this order can be produced by a simple manufacturing process when the odor absorbing layer is a printed layer, and has a sufficiently high ability to absorb odors selected from ammonia odors and amine odors.

[0062] <<Method for manufacturing odor-absorbing laminated film>> The odor-absorbing laminate film of the present invention may be produced by any method as long as it has the above-described structure. Typical production methods will be described below for the cases where the odor-absorbing layer is an adhesive layer and the case where the odor-absorbing layer is a printed layer.

[0063] <Manufacturing method when odor absorbing layer is adhesive layer> An odor-absorbing laminate film in which the odor-absorbing layer is an adhesive layer may be produced by a method including dry laminating a sealant layer and another layer using an odor-absorbing adhesive described below to form an odor-absorbing layer that is an adhesive layer between the sealant layer and the other layer.

[0064] For example, a laminated film including a substrate layer, a barrier layer, a reinforcing layer, an odor absorbing layer, and a sealant layer in this order can be Dry laminating the substrate layer, the barrier layer, and the reinforcing layer using an appropriate dry lamination adhesive to obtain a three-layer laminate; The surface of the resulting three-layer laminate on the side of the reinforcing layer and the sealant layer are dry-laminated using an odor-absorbing adhesive to form an odor-absorbing adhesive layer between the reinforcing layer and the sealant layer. It may be produced by a method comprising:

[0065] Dry lamination using an odor-absorbing adhesive may be carried out by a known dry lamination method or a method with appropriate modifications made by a person skilled in the art, except that an odor-absorbing adhesive is used as the dry lamination adhesive.

[0066] (Odor-absorbing adhesive) In accordance with another aspect of the present invention, an odor absorbing adhesive is provided.

[0067] The odor-absorbing adhesive of the present invention comprises nano-zeolite and an adhesive, and is used to absorb odors selected from ammonia odors and amine odors. The odor-absorbing adhesive may contain optional components other than the nano-zeolite and the adhesive. The optional components contained in the odor-absorbing adhesive may be, for example, a solvent and other optional components.

[0068] The nanozeolite and adhesive contained in the odor absorbing adhesive of the present invention may be selected appropriately depending on the type of nanozeolite and adhesive in the odor absorbing layer of the odor absorbing laminate film. The proportions of these components in the odor absorbing adhesive may also be set appropriately depending on the desired form of the odor absorbing layer.

[0069] The odor-absorbing adhesive may contain a solvent. This solvent may be an organic solvent, such as one or more selected from esters, alcohols, ketones, ethers, hydrocarbons, and the like.

[0070] Examples of esters include ethyl acetate, n-propyl acetate, isopropyl acetate, n-butyl acetate, isobutyl acetate, and isoamyl acetate; Examples of alcohols include methanol, ethanol, n-propanol, and isopropanol; Examples of ketones include acetone, methyl ethyl ketone, methyl-n-butyl ketone, and methylcyclohexanone; Examples of ethers include diethyl ether, tetrahydrofuran, ethylene glycol monomethyl ether, ethylene glycol monoethyl ether, and ethylene glycol monoethyl ether acetate; Examples of hydrocarbons include toluene, xylene, and n-hexane; Examples of each can be given.

[0071] The amount of solvent may be appropriately determined by a person skilled in the art depending on the coating method used so that the odor-absorbing adhesive has an appropriate viscosity. The amount of solvent may be, for example, 50% by mass or more, 60% by mass or more, 65% by mass or more, or 70% by mass or more, and may be, for example, 95% by mass or less, 90% by mass or less, 85% by mass or less, or 80% by mass or less, based on the total mass of the odor-absorbing adhesive.

[0072] The optional components contained in the odor-absorbing adhesive may be those contained in the desired odor-absorbing layer as well as components typically contained in adhesives, such as dispersants, plasticizers, tackifiers, fillers, thickeners, colorants, pH adjusters, antioxidants, and preservatives.

[0073] <Manufacturing method when odor absorbing layer is a printed layer> The odor absorbing laminate film in which the odor absorbing layer is a printed layer is, for example, An odor absorbing ink, as described below, is applied to the inner surface of the sealant layer (the surface that comes into contact with other layers when the laminated film is formed) or the sealant layer side surface of another layer that comes into contact with the sealant layer when the laminated film is formed, to form an odor absorbing layer, which is a printed layer, on the surface. Dry lamination is performed between the sealant layer and other layers using an appropriate dry lamination adhesive. It may be produced by a method comprising:

[0074] A laminated film including a substrate layer, a barrier layer, a reinforcing layer, an odor absorbing layer, and a sealant layer in this order can be, for example, dry laminating the base layer, the barrier layer, and the reinforcing layer using an appropriate dry lamination adhesive to obtain a three-layer laminate; Applying an odor absorbing ink to the surface of the resulting three-layer laminate on the reinforcing layer side to form an odor absorbing layer, which is a printed layer, on that surface; and The reinforcing layer on which the odor absorbing layer is formed is dry laminated to the sealant layer using an appropriate dry lamination adhesive. It may be produced by a method comprising:

[0075] A laminated film comprising a substrate layer, a barrier layer, an odor absorbing layer, a reinforcing layer, and a sealant layer in this order may be produced, for example, by the following method.

[0076] laminating a barrier layer on one surface of the base layer to obtain a first laminate having a two-layer structure; applying an odor absorbing ink onto one surface of the reinforcing layer and forming an odor absorbing layer, which is a printed layer, on that surface to obtain a second laminate having a two-layer structure; A dry lamination adhesive is applied to the barrier layer side of the first laminate, and the dry lamination is then performed on the odor absorbing layer side of the second laminate to obtain a four-layer laminate including a base layer, a barrier layer, an odor absorbing layer, and a reinforcing layer in this order; and A sealant layer is dry laminated onto the reinforcing layer side of the resulting four-layer laminate using a dry lamination adhesive. This method has the advantage that the odor-absorbing laminate film obtained has reduced residual solvent in the printed layer because no dry lamination adhesive is applied to the odor-absorbing layer, which is a printed layer.

[0077] Here, when obtaining the first laminate, lamination of the barrier layer on one surface of the base layer may be carried out by an appropriate method such as dry lamination or vapor deposition.

[0078] The coating using the odor absorbing ink may be carried out by a known coating method or a method with appropriate modifications made by a person skilled in the art, except that the odor absorbing ink is used as the ink.

[0079] (Odor absorbing ink) In accordance with another aspect of the present invention, an odor absorbing ink is provided.

[0080] The odor absorbing ink of the present invention contains nano zeolite and a resin and is used to absorb odors selected from ammonia odors and amine odors. The odor absorbing ink may contain optional components other than the nano zeolite and the resin. The optional components contained in the odor absorbing ink may be, for example, a solvent and other optional components.

[0081] The nanozeolite and resin contained in the odor absorbing ink of the present invention may be selected appropriately depending on the type of nanozeolite and resin in the odor absorbing layer of the desired odor absorbing laminate film. The proportions of these components in the odor absorbing ink may also be set appropriately depending on the desired form of the odor absorbing layer.

[0082] The solvent contained in the odor absorbing ink is not particularly limited as long as it can disperse the nanozeolite and dissolve the resin. The solvent may be, for example, one or more selected from esters, alcohols, ketones, ethers, hydrocarbons, etc.

[0083] Examples of esters include ethyl acetate, n-propyl acetate, isopropyl acetate, n-butyl acetate, isobutyl acetate, and isoamyl acetate; Examples of alcohols include methanol, ethanol, n-propanol, and isopropanol; Examples of ketones include acetone, methyl ethyl ketone, methyl-n-butyl ketone, and methylcyclohexanone; Examples of ethers include diethyl ether, tetrahydrofuran, ethylene glycol monomethyl ether, ethylene glycol monoethyl ether, and ethylene glycol monoethyl ether acetate; Examples of hydrocarbons include toluene, xylene, and n-hexane; Examples of each can be given.

[0084] The amount of solvent may be appropriately determined by those skilled in the art so that the odor absorbing ink has an appropriate viscosity depending on the printing method used. The amount of solvent may be, for example, 50% by mass or more, 60% by mass or more, 70% by mass or more, 75% by mass or more, 80% by mass or more, or 85% by mass or more, relative to the total mass of the odor absorbing ink, and may be, for example, 98% by mass or less, 95% by mass or less, 93% by mass or less, or 90% by mass or less.

[0085] The optional components contained in the odor absorbing ink may be those contained in the desired odor absorbing layer as well as components normally contained in inks, such as penetrating agents, anti-drying agents, pH adjusters, preservatives, etc.

[0086] Odor-absorbing packaging bags In accordance with yet another aspect of the present invention, an odor-absorbing packaging bag is provided.

[0087] The odor-absorbing packaging bag of the present invention includes the odor-absorbing laminate film of the present invention. The packaging bag of the present invention may be formed into a bag shape, such as a triangular pack shape, with the sealant layer side of the odor-absorbing laminate film of the present invention facing inward.

[0088] The odor-absorbing packaging bag of the present invention is, for example, Folding one sheet of odor absorbing laminated film with the sealant layer side facing inward and sealing the edges other than the folded part. Two laminated odor absorbing films are placed with the sealant layers facing each other and the edges are sealed; or One odor absorbing laminate film and another packaging bag forming laminate film are placed so that the sealant layer sides of each film face each other, and the edges are sealed. It can be produced by the following method.

[0089] The above-mentioned "other laminate film for forming packaging bags" may be appropriately selected from known laminate films for forming packaging bags having a sealant layer on at least one of the outermost surfaces, depending on the intended use of the packaging bag, etc.

[0090] In producing the odor-absorbing packaging bag of the present invention, the edges may be sealed by a known method such as heat sealing, ultrasonic sealing, or high-frequency sealing.

[0091] The odor-absorbing packaging bag of the present invention may be, for example, a packaging bag for supplements, food, etc. Because the odor-absorbing packaging bag of the present invention includes the odor-absorbing laminate film of the present invention, it has excellent absorption properties for odors selected from ammonia odors and amine odors. Therefore, the odor-absorbing packaging bag of the present invention is suitable as a packaging bag for supplements, foods, etc. that emit odors selected from amine odors and ammonia odors due to oxidation, heat sterilization, deterioration over time, etc.

[0092] <Packaging bag containing contents> According to yet another aspect of the present invention, a packaged bag containing an item is provided.

[0093] The packaging bag containing the contents of the present invention includes the odor-absorbing packaging bag of the present invention and the contents therein.

[0094] The contents in the content-containing packaging bag of the present invention may be, for example, supplements, food, etc., and in particular, supplements, food, etc. that emit an odor selected from an amine odor or an ammonia odor due to oxidation, heat sterilization treatment, deterioration over time, etc. [Example]

[0095] In the following Examples and Comparative Examples, the following deodorants and laminated film raw materials were used, respectively.

[0096] Deodorant <Zeolite> Nano ZSM-5: Pulverized and classified ZSM-5, SAR=200, MFI type, average particle size 50nm Zeoal-4A: Na-A type zeolite, SAR=2, LTA type, average particle size 50 nm Abscents 3000: Trade name, high silica zeolite manufactured by Resonac Universal Co., Ltd., SAR = 400 to 800, MFI type, average particle size 3 to 5 μm (3,000 to 5,000 nm) 4A: Na-A type zeolite, SAR=2, LTA type, average particle size 3-5 μm (3,000-5,000 nm)

[0097] <Transition metal doped zeolite> Zeoal-Ag: Nakamura Choukou Co., Ltd., "Zeoal (registered trademark) Ag", Ag-nano zeolite, Na-A type zeolite + 30-50 mol% of the ions are Ag + Ion-exchanged zeolite, SAR=2, LTA type, average particle size 50nm Zeoal-Cu: Nakamura Choukou Co., Ltd., "Zeoal (registered trademark) Cu", Cu-nano zeolite, Na-A type zeolite + 60 to 90 mol% of the ions are Cu 2+ Ion-exchanged zeolite, SAR=2, LTA type, average particle size 50nm Zeoal-Zn: Nakamura Choukou Co., Ltd., "Zeoal (registered trademark) Zn", Zn-nano zeolite, Na-A type zeolite + 20 to 40 mol% of the ions are Zn 2+ Ion-exchanged zeolite, SAR=2, LTA type, average particle size 50nm

[0098] <Other metal oxides> Zinc oxide: Zinc oxide particles, manufactured by Sakai Chemical Industry Co., Ltd., product name "Fine Zinc Oxide", average particle size 200-300nm

[0099] The above average particle size is a particle size at which the cumulative mass percentage is 50% in the particle size distribution obtained by laser diffraction method measured in accordance with JIS Z8825:2022.

[0100] <Laminated film raw material> <Base material layer> PET(12): Polyethylene terephthalate film, thickness 12 μm

[0101] <Barrier layer> AL(9): Aluminum foil, thickness 9 μm

[0102] <Reinforcing layer> Ny(15): Nylon film, thickness 15 μm,

[0103] <Sealant layer> LLDPE(50): Linear low-density polyethylene film, thickness 50 μm

[0104] <Laminating adhesive> Mitsui Chemicals ester-based two-component adhesive Main ingredient: Takelac (registered trademark) A-525, solid content 50% by mass Hardener: Takenate (registered trademark) A-52, solid content 75% by weight

[0105] In each of Examples 1 to 5 and Comparative Examples 1 to 4, an odor-absorbing adhesive was prepared, and the deodorizing properties of the laminated film produced using the odor-absorbing adhesive were examined.

[0106] Example 1 1. Preparation of Odor-Absorbing Adhesive An odor-absorbing adhesive was prepared by mixing 9 parts by weight of "Takelac A-525," an aliphatic ester-based two-component adhesive, 1 part by weight of "Takenate A-52," a curing agent, 14 parts by weight of ethyl acetate as a dilution solvent, and 0.5 parts by weight of Zeoal-Ag as a deodorizing agent (zeolite). The content of the deodorizing agent (zeolite) in the resulting odor-absorbing adhesive was 2.0% by weight.

[0107] 2. Manufacturing of laminated film A laminated film having the following layer structure was produced by dry lamination. The odor-absorbing adhesive prepared above was used to bond Ny (15) and LLDPE (50) to form an odor-absorbing layer. The odor-absorbing adhesive had a coating weight of 3.5 g / m2 after solvent removal. 2 (Deodorant amount: 0.30g / m 2For bonding between the other layers, the above-mentioned laminating adhesive was used to form a laminating adhesive layer that did not contain a deodorant. PET(12) / / AL(9) / / Ny(15) / Odor absorbing layer / LLDPE(50)

[0108] Here, " / / " indicates a laminating adhesive layer in a dry laminate.

[0109] In the above, the coating suitability of the odor absorbing adhesive when applied was visually inspected and evaluated according to the following criteria. A: When the coating layer is smooth C: When the coating layer is not smooth

[0110] 3. Evaluation The obtained laminated film was heat-sealed with the LLDPE (50) side facing inward to form a three-sided sealed bag with internal dimensions of 100 mm x 110 mm, and then the remaining side was heat-sealed so that the bag had a triangular pack shape (a tetrahedron with each side being a triangle) to produce a packaging bag with a capacity of approximately 170 mL.

[0111] 300 μL of saturated vapor pressure gas of a 10 mass % aqueous solution of ammonia (ammonia concentration: approximately 290,000 ppm (29 mass %)) was poured into the resulting packaging bag.

[0112] After gas injection, the packaging bag was stored for 7 days (168 hours) in an environment of 23°C. After storage, the ammonia concentration inside the bag was measured using a Gastec Corporation short-term detector tube "Amines No. 180." The average value of n=3 repeated measurements was 1.5 ppm, demonstrating excellent odor absorption properties.

[0113] Examples 2 to 5 and Comparative Examples 1 to 4 Except for changing the type of deodorant as shown in Table 1, odor-absorbing adhesives were prepared and evaluated in the same manner as in Example 1. In Comparative Example 1, evaluation was performed using an adhesive containing no deodorant instead of the odor-absorbing adhesive. The results are shown in Table 1.

[0114] [Table 1]

[0115] In Examples 6 to 10 and Comparative Examples 5 to 8, inks for absorbing odors selected from ammonia odor and amine odor were prepared, and the deodorizing properties of laminated films produced using the inks were examined.

[0116] Example 6 1. Preparation of ink for absorbing odors selected from ammonia odor and amine odor An ink for absorbing odors selected from ammonia odors and amine odors was prepared by mixing 100 parts by weight of "Lio Alpha SX-R Medium" manufactured by Toyo Ink Co., Ltd. with 40 parts by weight of ethyl acetate, 20 parts by weight of isopropanol, and 20 parts by weight of methyl ethyl ketone as diluents, and further mixing in 7.0 parts by weight of Zeoal-Ag as a deodorant (zeolite). The content of the deodorant (zeolite) in the resulting ink was 3.7% by weight. "Lio Alpha SX-R Medium" is a medium with a solids concentration of 15% by weight and contains a urethane resin.

[0117] 2. Manufacturing of laminated film A laminate with a layer structure of PET(12) / / AL(9) / / Ny(15) was produced by the dry lamination method. At this time, the laminate adhesive described above was used to bond the layers together, forming a laminate adhesive layer that did not contain a deodorant.

[0118] The odor absorbing ink selected from ammonia odor and amine odor obtained above was applied to the Ny (15) side of the obtained laminate to form an odor absorbing layer. Here, the ink for absorbing odors selected from ammonia odor and amine odor was applied in an amount of 1.0 g / m after solvent removal. 2 (Deodorant amount: 0.32g / m 2 ) was applied.

[0119] At this time, the coating suitability when an ink for absorbing an odor selected from ammonia odor and amine odor was applied was visually examined and evaluated according to the following criteria. A: When the coating layer is smooth C: When the coating layer is not smooth

[0120] Next, LLDPE (50) was dry laminated onto the ink-coated surface using the above-mentioned laminating adhesive to produce a laminated film having the following layer structure. PET(12) / / AL(9) / / Ny(15) / Odor absorbing layer / LLDPE(50)

[0121] In the above, " / / " indicates a laminating adhesive layer in a dry laminate. 3. Evaluation The obtained laminated film was evaluated in the same manner as in Example 1. The results are shown in Table 2.

[0122] Examples 7 to 10 and Comparative Examples 5 to 8 Except for changing the type of deodorant as shown in Table 2, inks for absorbing odors selected from ammonia odor and amine odor were prepared and evaluated in the same manner as in Example 6. In Comparative Example 5, LLDPE (50) was dry laminated onto the Ny (15) surface without coating the ink for absorbing odors selected from ammonia odor and amine odor, and a laminated film was produced and evaluated. The results are shown in Table 2.

[0123] [Table 2]

[0124] The following can be seen from Tables 1 and 2.

[0125] In the laminated films of Comparative Examples 1 and 5, in which no deodorant was used, the ammonia concentration after storage decreased from the initial value, but was 14.5 ppm (Comparative Example 1) to 15.0 ppm (Comparative Example 5), and remained at a high concentration that could be detected by olfactory sense.

[0126] Furthermore, the laminated films of Comparative Examples 2 to 4 and 6 to 8, which used conventional deodorants, had ammonia concentrations after storage that were not significantly different from those of the laminated films of Comparative Examples 1 and 5, which did not use deodorants.

[0127] In contrast, the ammonia concentration after storage was reduced in the laminate films of Examples 1 to 10, which used nanozeolite as a deodorant. In particular, the ammonia concentration after storage was low in the laminate films of Examples 1 to 3, 5 to 8, and 10, which used nanozeolite with a low SAR, and the ammonia concentration after storage was particularly low in the laminate films of Examples 1 to 3 and 6 to 8, which used transition metal-doped nanozeolite as a deodorant.

Claims

1. a substrate layer, an odor absorbing layer, and a sealant layer in this order; The odor absorbing layer comprises nano zeolite, Used to absorb odors selected from ammonia odor and amine odor, Odor absorbing laminated film

2. The average particle size of the nano zeolite is 5 nm or more and 500 nm or less, The average particle size is a particle size at which a cumulative mass percentage is 50% in a particle size distribution obtained by a laser diffraction method measured in accordance with JIS Z8825:2022. The laminated film according to claim 1 .

3. The laminated film according to claim 1, wherein the nanozeolite has an SAR of 20 or less.

4. The laminated film according to claim 2 , wherein the nanozeolite has an SAR of 20 or less.

5. The laminated film according to claim 1 , wherein the nanozeolite is a transition metal-doped nanozeolite.

6. The laminated film according to claim 2 , wherein the nanozeolite is a transition metal-doped nanozeolite.

7. The laminated film according to claim 5 or 6, wherein the transition metal is one or more transition metals selected from Ag, Cu, and Zn.

8. The laminated film according to claim 7 , wherein the transition metal is Cu.

9. The laminated film according to any one of claims 1 to 6, wherein the odor absorbing layer is an adhesive layer containing the nano zeolite.

10. The laminate film according to any one of claims 1 to 6, wherein the odor absorbing layer is a printed layer containing the nano zeolite.

11. The laminate film according to any one of claims 1 to 6, further comprising one or two layers selected from a barrier layer and a reinforcing layer between the substrate layer and the odor absorbing layer.

12. An odor-absorbing packaging bag comprising the laminated film according to any one of claims 1 to 6.

13. The packaging bag according to claim 12, which is for packaging supplements.

14. A packaging bag containing a content, comprising the packaging bag according to claim 12 and the content thereof.

15. The packaging bag containing the contents according to claim 14, wherein the contents are supplements.

16. nano zeolite and an adhesive, Used to absorb odors selected from ammonia odor and amine odor, Odor absorbing adhesive.

17. Contains nano zeolite and resin, Used to absorb odors selected from ammonia odor and amine odor, Odor absorbing ink.

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