Chemical volatilization sheet

Abstract

The purpose of the present invention is to provide a chemical volatilization sheet which is capable of preventing a repellent or an insecticide from sticking to a finger of a user even when the user touches the sheet and preventing a repellent or an insecticide from being transferred to the tongue of the user even when the user licks the sheet and which is capable of maintaining a shape that is not folded or rounded while being transformable even when contacting clothes. The purpose could be achieved by a chemical volatilization sheet comprising: a chemical holding layer (1) impregnated with at least one of a repellent or an insecticide; and a permeable layer (2) disposed on at least one side of the chemical holding layer (1) and having through-holes (21) through which the repellent and the insecticide permeate, wherein the bending strength is 1.0-15.0 MPa, and the ratio of the area of the through-holes (21) to the thickness of the permeable layer (2) satisfies the area of the through-holes (21) / thickness of the permeable layer (2)=0.3-40.　

Description

Chemical evaporating sheet

[0001] The present invention relates to a chemical volatilizing sheet that is worn by a user or placed in a clothing storage area to repel or exterminate harmful insects, such as mosquitoes and horseflies, in order to prevent damage to the human body or clothing from harmful insects, such as insect bites and eating of clothing.

[0002] Conventionally, pest repellent sheets and the like have been known which include a pest repellent layer containing a volatile compound with pest repellency in order to prevent damage from pests, such as by preventing insect bites by pests such as mosquitoes and horseflies, or by preventing pests such as brontosa beetles and burr moths from eating clothes.The pest repellent sheet is worn by the user or placed in a clothing storage location such as a clothes drawer or closet, and the compound active ingredient is gradually vaporized from the pest repellent layer, thereby preventing damage from pests by keeping pests away.

[0003] For example, Patent Document 1 discloses an example of such a chemical volatilizing sheet, which includes a chemical retention layer impregnated with at least one of a volatile repellent or insecticide, a barrier layer provided on one side of the chemical retention layer that is impermeable to the repellent or insecticide, and an adhesive layer provided on the barrier layer on the opposite side of the chemical retention layer that can adhere to an object to be adhered.

[0004] Japanese Patent Application Laid-Open No. 2019-137668

[0005] However, in the invention of Patent Document 1 relating to the drug volatilization sheet, the drug retention layer is exposed to the outside, so if the user comes into contact with the drug retention layer, there is a risk that, depending on the drug impregnated in it, it may cause symptoms of poisoning such as vomiting, diarrhea, headache, and tinnitus.

[0006] Even if a film that allows the pesticide to permeate is applied to the pesticide-retaining layer to prevent the above-mentioned poisoning symptoms on the skin that comes into contact with the pest, the sustained release of the pesticide is poor and sufficient pest control effect may not be achieved. Furthermore, there has been a demand for a pesticide that can be worn by the user, but can also be placed or hung in a wardrobe or closet, and can maintain its shape without folding or rolling up even when it comes into contact with clothing when taking clothes in and out.

[0007] Therefore, the present invention aims to provide a chemical volatilizing sheet that has a control effect of repelling and exterminating pests, such as mosquitoes and horseflies, and that can be worn by a user or placed in a clothing storage area such as a clothes drawer or closet in order to prevent damage from pests, such as preventing bites from these pests, and that easily volatilizes the repellent or insecticide, prevents the repellent or insecticide impregnated in the chemical retention layer from sticking to the user's fingers when the user touches the chemical volatilizing sheet with their fingers, and prevents the repellent or insecticide impregnated in the chemical retention layer from transferring to the user's tongue when the user licks the chemical volatilizing sheet with their tongue, and that can be deformed when it comes into contact with clothing, yet can maintain its shape without being folded or rolled up.

[0008] [1] That is, the present invention provides a chemical volatilizing sheet comprising a chemical retention layer (1) impregnated with at least one of a repellent and an insecticide, and a permeable layer (2) disposed on at least one side of the chemical retention layer (1) and having through holes (21) through which the repellent and the insecticide pass, the sheet having a bending strength of 1.0 to 15.0 MPa, and a ratio of the area of ​​the through holes (21) to the thickness of the permeable layer (2) of 0.3 to 40, where the area of ​​the through holes (21) is expressed as the area of ​​the through holes (21) / the thickness of the permeable layer (2).

[0009] [2] The drug volatilizing sheet according to [1] above is characterized in that the permeable layer (2) is disposed on both sides of the drug retention layer (1).

[0010] [3] The chemical volatilizing sheet according to [1] above is characterized in that the permeable layer (2) is disposed on one side of the chemical retention layer (1), and is provided with a barrier layer (4) on the other side of the chemical retention layer (1) that is impermeable to the repellent or insecticide, and an adhesive layer (5) on the barrier layer (4) that is adhered to an object to be adhered and is provided on the opposite side of the chemical retention layer (1).

[0011] [4] The drug volatilizing sheet according to [1] or [2] above is characterized in that it has a label (3) provided on the outer surface of the drug retention layer (1).

[0012] [5] The drug-evaporating sheet according to either [1] or [2] is characterized in that the drug-retaining layer (1) is formed from at least one of paper nonwoven fabric and woven fabric.

[0013] [6] The drug volatilizing sheet according to any one of [1] to [3], characterized in that the permeable layer (2) is formed from one selected from polyolefin, fluororesin, polyethylene terephthalate, and ethylene-vinyl alcohol copolymer.

[0014] The chemical volatilizing sheet of the present invention allows the repellent or insecticide to be easily volatilized, and prevents the repellent or insecticide impregnated in the chemical retention layer from sticking to the user's fingers when the user touches the chemical volatilizing sheet with their fingers, and prevents the repellent or insecticide impregnated in the chemical retention layer from transferring to the user's tongue when the user licks the chemical volatilizing sheet with their tongue.Furthermore, the sheet can be deformed when it comes into contact with clothing, but can maintain its shape without folding or rolling.

[0015] Fig. 1 is a plan view of a drug volatilization sheet in a first embodiment of the present invention. Fig. 2 is an exploded perspective view of a drug volatilization sheet in a first embodiment of the present invention. Fig. 3 is a plan view of a drug volatilization sheet in a second embodiment of the present invention. Fig. 4 is an exploded perspective view of a drug volatilization sheet in a second embodiment of the present invention.

[0016] Hereinafter, embodiments of the chemical volatilizing sheet of the present invention will be described in detail. Note that when the notation "to" is used in the description to indicate a range, the range includes both the upper and lower limits.

[0017] In the first embodiment shown in Figures 1 and 2, a chemical retention layer 1 is impregnated with a chemical such as a repellent or insecticide, and permeable layers 2 are disposed on both sides of the chemical retention layer 1. The device can be placed or hung in a wardrobe or closet, or worn by the user by attaching an attachment such as a clip or a lanyard. In the second embodiment shown in Figures 3 and 4, the permeable layer 2, barrier layer 4, and adhesive layer 5 are laminated on the chemical retention layer 1 impregnated with a chemical such as a repellent or insecticide. The device can be attached to the user's skin or clothing, or even to a flat wall surface or a corner between walls, so that it can be used indoors or outdoors. Instead of a repellent or insecticide, a disinfectant or fragrance can also be impregnated into the chemical retention layer 1.

[0018] The repellent in the present invention is a compound that gradually volatilizes at room temperature of about 15 to 40°C, which is the temperature in the usage environment, and is a liquid or solid active ingredient that repels pests such as mosquitoes and horseflies, preventing them from sucking blood, or a composition that contains such a compound as one of its components. In order to exert a repellent effect over time, it is preferable to use a repellent whose boiling point is higher than the above-mentioned room temperature. Note that pyrethroid compounds, which will be described later, can also be used as repellents.

[0019] Such repellents preferably contain essential oils as active ingredients. Specific examples of essential oils include those extracted from grapefruit, geranium, rosemary, anise, almoise, ylang-ylang, orange, cananga, chamomile, cardamom, cajeput, clary sage, clove, coriander, cypress, sandalwood, cedarwood, citronella, juniper berry, ginger, spearmint, sage, tea tree, nutmeg, neroli, pine needle, basil, patchouli, palmarosa, fennel, black pepper, petitgrain, vetiver, peppermint, bergamot, marjoram, mandarin, lemon eucalyptus, eucalyptus, copaiba, lime, lavender, lemon, lemongrass, rosewood, alpinia japonica leaf, cinnamon bark, and peppermint. Essential oils extracted from one of these plants or two or more of these plants can be used in combination.

[0020] The essential oils obtained from the above plants contain various volatile compounds, i.e., essential oil components. Grapefruit contains d-limonene, myrcene, α-pinene, etc. Geranium contains citronellol, geraniol, linalool, etc. Rosemary contains α-pinene, camphor, 1,8-cineole, etc. Anise contains (E)-anethole, limonene, anisaldehyde, etc. Almoise contains 1,8-cineole, thujone, borneol, camphor, pinene, artemisinin (sesquiterpene lactone), linalool, nerol, etc. Ylang-ylang contains linalool, β-potassium olefin, germacrene D, etc. Orange contains limonene, myrcene, β-bisabolene, etc. Cananga contains caryophyllene, geranyl acetate, terpineol, etc. Chamomile contains farnesene, chamazulene, α-bisabolol oxide B, etc. Cardamom contains 1,8-cineole, α-terpinyl acetate, limonene, etc. Cajeput contains 1,8-cineole, α-terpineol, para-cymene, etc. Clary sage contains linalyl acetate, linalool, germacrene D, etc. Cloves contain eugenol, β-caryophyllene, eugenyl acetate, etc. Coriander contains d-linalool, camphor, α-pinene, etc. Cypress contains α-pinene, δ-3-carene, etc. Sandalwood contains cis-α-santalol, cis-β-santalol, epi-β-santalol, etc. Cedarwood contains thujopsene, α-cedrene, cedrol, etc. Citronella contains geraniol, limonene, citronellol, camphene, citronellal, geranyl acetate, α-pinene, α-terpineol, etc. Juniper berries contain α-pinene, myrcene, β-farnesene, etc. Ginger contains ar-curcumene, α-zingiberene, β-sesquiphellandrene, etc.Spearmint contains (-)-carvone, dihydrocarvone, 1,8-cineole, etc. Sage contains α-thujone, β-thujone, camphor, etc. Tea tree contains terpinen-4-ol, γ-terpinene, α-terpinene, etc. Nutmeg contains α-pinene, sabinene, β-pinene, etc. Neroli contains linalool, limonene, β-pinene, etc. Pine needles contain α-pinene, β-pinene, myrcene, etc. Basil contains linalool, methyl chavicol, β-caryophyllene, etc. Patchouli contains patchouli alcohol, α-patulene, β-caryophyllene, etc. Palmarosa contains geraniol, geranyl acetate, linalool, etc. Fennel contains (E)-anethole, limonene, methyl chavicol, etc. Black pepper contains β-3-caryophyllene, δ-3-carene, limonene, etc. Petitgrain contains linalyl acetate, linalool, α-terpineol, etc. Vetiver contains vetiverol, vetiven, α-vetibol, etc. Bergamot contains limonene, linalyl acetate, linalool, etc. Marjoram contains terpinen-4-ol, cis-sabinene hydrate, para-cymene, etc. Mandarin contains limonene, γ-terpinene, β-pinene, etc. Lemon eucalyptus contains citronellal, citronellol, citral, etc. Eucalyptus contains 1,8-cineole, α-pinene, limonene, aromadendrene, p-cymene, t-pinocarveol, and globulol. Copaiba contains β-potassium olefin, α-humulene, α-copaene, t-α-bergamottene, germacrene D, cadinene, α-bisabolene, γ-mulolene, β-elemene, and σ-elemene. Lime contains limonene, γ-terpinene, and β-pinene. Lavender contains linalyl acetate, linalool, and (Z)-β-ocimene. Lemon contains limonene, β-pinene, and γ-terpinene.Lemongrass contains geranial, citral, elemol, etc. Rosewood contains linalool, α-terpineol, cis-linalool oxide, etc. Peppermint contains l-menthol, l-menthone, menthofuran, etc. Cinnamon bark contains cinnamaldehyde, t-2-methoxycinnamaldehyde, coumarin, etc. Shell ginger leaves contain 1,8-cineole, terpinen-4-ol, p-cymene, etc. Mint contains l-menthol, l-menthone, menthofuran, etc.

[0021] The insecticide of the present invention preferably contains a pyrethroid compound as an active ingredient. Pyrethroid compounds are insecticidal components contained in pyrethrum and their derivatives, and include both natural products obtained by extraction or other methods from plants, etc., and synthetic compounds synthesized by organic synthesis techniques. The use of pyrethroid compounds acts as an active ingredient, exerting a control effect on the nerves of pest insects such as mosquitoes and horseflies, thereby eliminating these pests. Furthermore, similar to repellents, it is preferable to use an insecticide with a boiling point higher than the above-mentioned room temperature in order to exert a control effect over time. The insecticide is either a pyrethroid compound itself or a composition containing the pyrethroid compound as one of its components.

[0022] Specific examples of pyrethroid compounds include natural pyrethroids such as pyrethrin I <(1R,3R)-2,2-dimethyl-3-(2-methyl-1-propenyl)cyclopropanecarboxylic acid (1S)-2-methyl-4-oxo-3-(2Z)-2,4-pentadienyl-2-cyclopenten-1-yl ester>, pyrethrin II <(1R,3R)-3-[(1E)-3-methoxy-2-methyl-3-oxo-1-propenyl]-2,2-dimethylcyclopropanecarboxylic acid (1S)-2-methyl-4-oxo-3-(2Z)-2,4-pentadienyl-2-cyclopenten-1-yl ester>, cinerin I <( 1R,3R)-2,2-dimethyl-3-(2-methyl-1-propenyl)cyclopropanecarboxylic acid (1S)-3-(2Z)-(2-butenyl)-2-methyl-4-oxo-2-cyclopenten-1-yl ester>, cinerin II <(1R,3R)-3-[(1E)-3-methoxy-2-methyl-3-oxo-1-propenyl]-2,2-dimethylcyclopropanecarboxylic acid (1S)-3-(2Z)-(2-butenyl)-2-methyl-4-oxo-2-cyclopenten-1-yl ester>, jasmolin I <(1R,3R)-2,2-dimethyl-3-(2-methyl-1-propenyl)cyclopropanecarboxylic acid (1S)-2-methyl-4-oxo-3-(2Z)-2-pentenyl-2-cyclopenten-1-yl ester>, Jasmolin II <(1R,3R)-3-[(1E)-3-methoxy-2-methyl-3-oxo-1-propenyl]-2,2-dimethylcyclopropanecarboxylic acid (1S)-2-methyl-4-oxo-3-(2Z)-2-pentenyl-2-cyclopenten-1-yl ester>, and synthetic pyrethroids such as allethrin I <2,2-dimethyl-3-(2-methyl-1-propenyl)cyclopropanecarboxylic acid 2-methyl-4-oxo-3-(2-propenyl)-2-cyclopenten-1-yl ester>, allethrin II <3-(3-methoxy-2-methyl-3-oxo-1-propenyl)-2,2-dimethylcyclopropanecarboxylic acid 2-methyl-4-oxo-3-(2-propenyl)-2-cyclopenten-1-yl ester>, and phthalthrin (also known asD-Tetramethrin) <(1,3-dioxo-4,5,6,7-tetrahydroisoindolin-2-yl)methyl 2,2-dimethyl-3-(2-methylprop-1-en-1-yl)cyclopropane-1-carboxylate>, Resmethrin <(5-benzyl-3-furyl)methyl 2,2-dimethyl-3-(2-methylprop-1-en-1-yl)cyclopropanecarboxylate>, Fenothrin <3-phenoxazole> Cybenzyl 2-dimethyl-3-(methylpropenyl)cyclopropanecarboxylate>, permethrin 3-phenoxybenzyl 3-(2,2-dichlorovinyl)-2,2-dimethylcyclopropanecarboxylate>, cyphenothrin cyano(3-phenoxyphenyl)methyl 2,2-dimethyl-3-(2-methylprop-1-en-1-yl)cyclopropanecarboxylate>, etofenprox 4 -(4-ethoxyphenyl)-4-methyl-1-(3-phenoxyphenyl)-2-oxapentane>, metofluthrin <2,2-dimethyl-3-(prop-1-en-1-yl)cyclopropanecarboxylic acid = 2,3,5,6-tetrafluoro-4-(methoxymethyl)benzyl>, profluthrin <(1R,3R)-2,2-dimethyl-3-[(Z)-1-propenyl]cyclopropanecarboxylic acid = 2,3,5,6-tetrafluoro-4-(methoxymethyl)benzyl> Preferred are tetrafluoro-4-methylbenzyl>, transfluthrin <(1R,3S)-3-[(E)-2,2-dichlorovinyl]-2,2-dimethylcyclopropanecarboxylic acid = 2,3,5,6-tetrafluorobenzyl>, cyfluthrin <cyano(4-fluoro-3-phenoxyphenyl)methyl = 3-(2,2-dichlorovinyl)-2,2-dimethylcyclopropane-1-carboxylate>, and empenthrin. Of the above, permethrin, fenothrin, allethrin, phthalthrin, restmethrin, metofluthrin, transfluthrin, profluthrin, and empenthrin are more preferred, and metofluthrin, transfluthrin, profluthrin, and empenthrin are most preferred. The above pyrethroid compounds can be used alone or in combination of two or more.

[0023] Some of the above-mentioned repellents and insecticides may have adverse effects on the human body, such as causing symptoms of poisoning such as vomiting, diarrhea, headaches, and tinnitus when users come into contact with them. Therefore, there is technical significance in providing a permeable layer 2, which will be described later, so that the repellent or insecticide impregnated in the drug retention layer 1 does not adhere to the user's fingers when the user touches the drug-evaporating sheet with their fingers, and so that the repellent or insecticide impregnated in the drug retention layer 1 does not transfer to the user's tongue when the user licks the drug-evaporating sheet with their tongue.

[0024] In addition to the essential oils and pyrethroid compounds that are the active ingredients of the repellents and insecticides, the solvents may include paraffinic hydrocarbons, glycol ethers, citrate esters, alcohols, and polyhydric alcohols with divalent or higher hydroxyl groups. Paraffinic hydrocarbons are saturated hydrocarbons with linear or branched chains containing approximately 10 to 30 carbon atoms, and multiple types can be used in combination. Furthermore, they are compatible with the drug retention layer 1, spreading evenly throughout the drug retention layer 1 and dissolving the essential oils and pyrethroid compounds well. Polyhydric alcohols have low volatility at room temperature, allowing them to remain in the drug retention layer 1 for a long time. They also dissolve essential oils and pyrethroid compounds, allowing them to gradually volatilize, thereby sustaining the pest control effect.

[0025] Preferred glycol ethers include diethylene glycol monohexyl ether, diethylene glycol mono-2-ethylhexyl ether, triethylene glycol monobutyl ether, ethylene glycol monophenyl ether, diethylene glycol dibutyl ether, dipropylene glycol mono-n-butyl ether, and tripropylene glycol mono-methyl ether. Preferred citrate esters include triethyl citrate, acetyl tributyl citrate, and acetyl triethyl citrate. Preferred alcohols include ethanol and isopropyl alcohol. Preferred polyhydric alcohols include propylene glycol, dipropylene glycol, 1,3-butylene glycol, sorbitol, glycerin, diglycerin, polyglycerin, and polyethylene glycol. The above alcohols and polyhydric alcohols can be used alone or in combination of two or more.

[0026] Furthermore, either the repellent or the insecticide can be impregnated and retained in the chemical retention layer 1 alone, or the repellent and the insecticide can be mixed in a predetermined ratio and then impregnated and retained in the chemical retention layer 1. According to the technology of the present invention, by impregnating the chemical retention layer 1 with an aromatic, a deodorizer, an anti-mold agent, or a bactericide instead of a repellent or an insecticide, the chemical retention layer 1 can be diverted to other uses.

[0027] The drug retention layer 1 is a substrate impregnated with at least one of a repellent or an insecticide. The drug retention layer 1 has a sheet-like shape with a thickness similar to that of a thin plate or paper. In order to maintain the pest control effect, the drug retention layer 1 is preferably formed from a material that does not chemically degrade with the repellent or insecticide over time.

[0028] Specifically, the drug retention layer 1 is preferably formed from a porous material having fine voids capable of retaining repellents or insecticides therein, such as nonwoven fabrics made of polyethylene or polypropylene, paper, woven fabrics, porous structures made of synthetic resins or inorganic materials, or composites thereof, with the voids communicating with the surface. Examples of the drug retention layer 1 include nonwoven fabrics made of polyethylene or polypropylene, and composites of polyethylene and paper blended in a polyethylene:paper weight ratio of 2-3:7-8. Resin plate members can also be used as long as they are impregnated with at least one of the repellent or insecticide. The drug retention layer 1 is dripped with the repellent or insecticide or immersed in the repellent or insecticide under normal or reduced pressure, and the penetration power of the agent fills and retains the fine voids, resulting in an impregnated state. Furthermore, in order to facilitate absorption of sunlight, promote a rise in the temperature of the drug retention layer 1, and facilitate the evaporation of the repellent or insecticide impregnated in the drug retention layer 1, the drug retention layer 1 can be colored black, purple, blue, green, etc. by kneading a coloring pigment into the material of the drug retention layer 1.

[0029] Furthermore, the drug retention layer 1 has a basis weight of 50 to 1000 g / m 2 The thickness is preferably 10 to 3000 μm, and the basis weight is 60 to 800 g / m 2 When the basis weight and thickness of the substantive substance retention layer 1 are within these ranges, it is possible to impregnate a predetermined amount of repellent or insecticide and have pores that are large enough to allow the repellent or insecticide to volatilize from the substantive substance retention layer 1 and diffuse to the outside.

[0030] The drug retention layer 1 preferably has a bending strength of 0.8 to 13.0 MPa. The bending strength is preferably measured in accordance with the method described in JIS K7171 or the like.

[0031] The permeable layer 2 is provided on at least one side of the chemical retention layer 1 and is a member that allows the repellent and insecticide to permeate. A plurality of through-holes 21 are formed in the permeable layer 2. By providing the permeable layer 2, the chemical volatilization sheet allows the repellent and insecticide to sufficiently volatilize while preventing the user from coming into contact with the chemical retention layer 1 containing the repellent and insecticide. As shown in FIGS. 1 to 4 , the permeable layer 2 is formed in a mesh-like shape, with a plurality of through-holes 21 formed as gaps in the mesh. In this embodiment, the shape of the through-holes 21 is rectangular or circular, but in other embodiments, they may be polygonal, such as triangular, pentagonal, or hexagonal, or may be a closed curve shape, such as an ellipse, oval, or semicircular. As in the first embodiment, in order to sandwich and integrate the drug retention layer 1 between the two permeation layers 2, methods such as applying ultrasound, high frequency, or a heat source to the outer peripheries of the two permeation layers 2 to melt and bond the permeation layer 2 and the drug retention layer 1 to encase and hold the drug retention layer 1 can be used, or as in the first and second embodiments, one or two permeation layers 2 can be bonded to the drug retention layer 1 with an adhesive. Of course, when the drug retention layer 1 is made of a material that does not easily melt with heat, such as paper, a thermosetting resin, or an inorganic material, it is possible to use a thermoplastic resin as the permeation layer 2, which can be melted by applying ultrasound, high frequency, or a heat source, and then entangled and bonded to the drug retention layer 1, as described below. Furthermore, in the first and second embodiments, the drug retention layer 1 and the permeation layer 2 can also be bonded using a spunbonding method, in which a resin such as polypropylene is melted at a high temperature into a filamentous form, which is then finely torn into fibers, and these fibers are placed between the drug retention layer 1 and the permeation layer 2 and heated. The area of ​​the through hole 21 is 0.01 to 40 mm 2 It is preferable that the thickness is 0.03 to 20 mm. 2It is more preferable that the thickness of the permeable layer 2 is 0.02 to 2 mm, and more preferably 0.04 to 1.8 mm. In particular, by having the thickness of the permeable layer 2 in this range, the chemical volatilizing sheet of the present invention can maintain its shape without being folded or curled up, even though it can be deformed when it comes into contact with clothing.

[0032] The ratio of the area of ​​the through holes 21 to the thickness of the permeation layer 2 is preferably 0.3 to 40, and more preferably 0.5 to 38, where the ratio of the area of ​​the through holes 21 to the thickness of the permeation layer 2 is 0.3 to 40, and when the ratio of the area of ​​the through holes 21 to the thickness of the permeation layer 2 is within this range, the repellent or insecticide is sufficiently volatilized, but even when a user touches the chemical volatilization sheet with their fingers, the repellent or insecticide impregnated in the chemical retention layer 1 does not adhere to the user's fingers via the permeation layer 2, and even when a user licks the chemical volatilization sheet with their tongue, the repellent or insecticide impregnated in the chemical retention layer 1 does not transfer to the tongue via the permeation layer 2.

[0033] Furthermore, the permeable layer 2 is preferably formed from polyolefins such as polyethylene and polypropylene, polyesters such as fluororesin, rayon, and polyethylene terephthalate, ethylene-vinyl alcohol copolymer (EVOH), etc. By forming the permeable layer 2 from these materials, the surface of the permeable layer 2 facing the drug retention layer 1, in particular, does not dissolve or swell when it comes into contact with a repellent or insecticide, and the repellent or insecticide impregnated in the drug retention layer 1 does not adhere to the user's fingers when the user touches the drug volatilizing sheet with their fingers, and the repellent or insecticide does not transfer to the user's tongue when the user licks the drug volatilizing sheet with their tongue.

[0034] Regarding the permeable layer 2, whether the repellent or insecticide can be sufficiently vaporized, and whether the permeable layer 2 can prevent the repellent or insecticide impregnated in the drug retention layer 1 from adhering to the user's fingers when the user touches the drug vaporization sheet with their fingers, and whether the repellent or insecticide will transfer to the user's tongue via saliva when the user licks the drug vaporization sheet with their tongue, was simulated and evaluated using various materials as shown below.

[0035] [Drug volatility test] Various mesh sheets that can be used as the permeation layer 2 were evaluated for their drug volatilization performance. Specifically, for various mesh sheets with rectangular through-holes, 50 mg of transfluthrin was impregnated into a paper drug retention layer 1 with a predetermined area and thickness, and then volatilized at 25 ° C for 24 hours. Then, the transfluthrin was ultrasonically extracted from the drug retention layer 1 with acetone, and analyzed by gas chromatography to confirm volatility. As a result, the drug that volatilized 5 mg or more was evaluated as ◎, the drug that volatilized 2 mg or more but less than 5 mg was evaluated as ○, the drug that volatilized 0.5 mg or more but less than 2 mg was evaluated as △, and the drug that volatilized less than 0.5 mg was evaluated as ×. Among these, the drug, especially the active ingredient, was volatilized, and ◎, ○ and △ were evaluated as good, and the volatilization amount was significantly low, and × was evaluated as bad. The thicknesses, areas of the through holes 21, and materials of the various mesh sheets are shown in Tables 1 and 2.

[0036] [Finger Non-Adhesion Test] Since it is preferable that the repellent or insecticide does not adhere to the fingers of users, particularly infants and young children, when they touch the chemical vaporization sheet with their fingers, various mesh sheets that can be used as the permeable layer 2 were placed on one side of the chemical retention layer 1, and the finger non-adhesion of black ink, which represented the chemical, was evaluated. Specifically, first, the chemical retention layer 1 coated with a predetermined amount of black ink was placed on an electronic balance, and various mesh sheets with rectangular through-holes were placed on the surface of the chemical retention layer 1. Then, a 1 cm square urethane, representing the user's skin, was placed on the various mesh sheets, and the urethane was pressed with a finger until the electronic balance showed a weight of 300 g or 500 g. The black ink adhering to the urethane was then visually confirmed. As a result, a sheet with no black ink adhering to the urethane was evaluated as ⊚, a sheet with almost no black ink adhering to the urethane was evaluated as ◯, a sheet with a small amount of black ink adhering to the urethane was evaluated as △, and a sheet with a considerable amount of black ink adhering to the urethane was evaluated as ×. Of these, ⊚ and ◯ were evaluated as good, indicating that the black ink acting as a drug was hardly adhered, and △ and × were evaluated as poor, indicating that the black ink was adhered. Note that the thickness, area of ​​the through holes 21, and material of the various mesh sheets were the same as those used in the drug volatilization test, and are shown in Tables 1 and 2.

[0037] [Oral non-administration test] Since it is preferable that the repellent or insecticide does not transfer when users, particularly infants, lick the drug sheet, various mesh sheets that can be used as the permeable layer 2 were placed on the other side of the drug retention layer 1, which is the surface side, and the user was licked with the tongue to evaluate whether the repellent or insecticide transfers to the tongue via saliva, that is, the oral non-administration test. 2 Drug retention layer 1 (thickness 350 μm, basis weight 120 g / m 2) was impregnated with 10 mg of transfluthrin, and after 5 minutes, 50 μL of artificial saliva was added onto the permeable layer 2, and a simulated tongue made of urethane was placed on top of it and brought back and forth 10 times in contact with the artificial saliva. After the test, the simulated tongue was extracted with acetone and analyzed by gas chromatography to evaluate the oral non-administration of the insecticide. When no peak of the insecticide was detected, it was determined that the insecticide had not been transferred to the tongue and was evaluated as ◯, and when the insecticide peak was detected, it was determined that the insecticide had been transferred to the tongue and was evaluated as ×.

[0038] The results of the finger non-adhesive test and the oral non-administrability test for various mesh sheets that can be used as the permeable layer 2 are shown in Tables 1 and 2.

[0039]

[0040]

[0041] As shown in Tables 1 and 2, in the mesh sheets of Reference Examples 1 to 6 and 8 to 18, the pesticide volatilized, but the black ink representing the pesticide did not adhere to the sheet, and the insecticide did not transfer to the simulated tongue. However, in the mesh sheets of Reference Examples 7 and 16 to 18, the black ink adhered, and the insecticide transferred to the simulated tongue. This shows that, as long as the permeable layer of the mesh sheet has a predetermined through-hole area and a predetermined permeable layer thickness, a pesticide volatilizing sheet equipped with such a sheet volatilizes the repellent or insecticide, and even if the user touches the pesticide volatilizing sheet with their fingers, the repellent or insecticide impregnated in the pesticide retention layer 1 does not adhere to the fingers, and the repellent or insecticide does not transfer to the tongue.

[0042] The marker 3 is fixed to the outer surface of the drug retention layer 1 with an adhesive or the like and serves as a marker that visually indicates to the user that the drug impregnated in the drug retention layer 1 has approximately evaporated. The marker 3 is composed of white or transparent particles such as silicon dioxide (refractive index 1.45), zeolite (refractive index 1.48), kaolin (refractive index 1.56), talc (refractive index 1.57), calcium carbonate (refractive index 1.58), polystyrene (refractive index 1.6), polyethylene (refractive index 1.53), and methyl methacrylate resin (refractive index 1.49), and is marked with the word "END" as shown in FIG. 2 . In other embodiments, the marker 3 can be Japanese characters such as "Please exchange" or "The end," or foreign language equivalents thereof, or symbols such as "x." It can also be configured by combining multiple of these characters, figures, and symbols. While the marker 3 is provided in this embodiment, it may or may not be provided depending on the intended use.

[0043] When the drug retention layer 1 is sufficiently impregnated with the drug, the refractive index of the drug is 1.4 to 1.6, which is the same value as the refractive index of the microparticles constituting the labeled portion 3. Therefore, when the microparticles constituting the labeled portion 3 come into contact with the drug and become wet, the drug and labeled portion 3 become assimilated, making it difficult for the user to see the labeled portion 3. On the other hand, when the drug retention layer 1 is hardly impregnated with the drug, the microparticles constituting the labeled portion 3 do not come into contact with the drug but come into contact with the surrounding air (refractive index 1.0), which increases the difference in refractive index between the microparticles constituting the labeled portion 3 and the air, making it easier for the user to see the labeled portion 3. Furthermore, to make the labeled portion 3 easier to see, it is preferable to make the color of the microparticles in the labeled portion 3 different from the color of the drug retention layer 1.

[0044] The barrier layer 4 is provided on the other side of the drug retention layer 1 and is a member that is impermeable to repellents or insecticides. Like the drug retention layer 1, the barrier layer 4 also has a sheet-like shape or the like and is made of a material that does not chemically degrade with the repellents or insecticides over time. By encasing or laminating the barrier layer 4 on another object, the repellent or insecticide impregnated in the drug retention layer 1 is prevented from seeping into the adhesive layer 5 or other objects, such as clothing attached to the adhesive layer 5, and causing physical or chemical degradation. Specifically, the barrier layer 4 is preferably a composite material in which polyolefins such as polyethylene and polypropylene, polyethylene terephthalate, metals such as aluminum, silica, or alumina are vapor-deposited on a plastic film. Note that methods such as welding by applying high frequency or heat can be used to integrate the barrier layer 4 and the drug retention layer 1.

[0045] The adhesive layer 5 is provided on the barrier layer 4 on the opposite side of the drug retention layer 1, and is a member that can be adhered to an object to be adhered. By providing the adhesive layer 5, it can be attached to the user's skin or clothing, etc., to prevent damage from pests when active outdoors, and can also be peeled off when no longer needed.

[0046] As the adhesive layer 5, various adhesives can be used, such as an acrylic resin-based adhesive obtained by polymerizing an acrylic monomer, or a urethane resin-based adhesive obtained by the reaction of an isocyanate group with a hydroxy group, and it is preferable that such an adhesive be formed in the form of a layer on one side surface of the barrier layer 4.

[0047] Although not shown, a release paper layer is preferably provided on the adhesive layer 5 on the side opposite the drug retention layer 1 and the barrier layer 4. The release paper layer prevents the adhesive layer 5 from adhering to unintended substrates when not in use and prevents dust and the like from adhering to the adhesive layer 5. The release paper layer is preferably attached to the adhesive layer 5 in advance, such as when the product is collected. The release paper layer may be attached individually to each pest control sheet according to its size, or a single release paper layer may be attached to all of a plurality of pest control sheets. Specifically, the release paper layer preferably has a base material such as high-quality paper or glassine paper, with a silicone resin applied to the surface that contacts the adhesive layer 5.

[0048] As described above, the chemical volatilizing sheet of the present invention is formed by disposing a chemical retention layer 1 impregnated with a chemical repellent or insecticide, and a permeable layer 2 on at least one side of the chemical retention layer 1. As shown in Figures 1 and 3, the chemical volatilizing sheet has a rectangular or circular shape, but in other embodiments, it may be a polygonal shape such as a triangle, square, pentagon, or hexagon, or a closed curved surface shape such as an ellipse or oval, or may be a rectangular, circular, or one of the above shapes folded into a V-shape or W-shape, or curved into a J-shape, U-shape, or O-shape, or may be in a roll shape that is stretched out when in use to volatilize a chemical such as a repellent or insecticide, or rolled up when unused and does not volatilize the chemical, or may be in various three-dimensional shapes other than a flat shape. In the drug volatilization sheet of the present invention, in order to prevent the permeation layer 2 from peeling off from its edge and detaching from the drug retention layer 1 during use, thereby exposing the drug retention layer 1, it is preferable to use a locking member that covers the outer peripheral side of the drug retention layer 1 and the outer peripheral side of the permeation layer 2 disposed on both sides thereof, and clamps and locks the edges of the drug retention layer 1 and the permeation layer 2, and has a cross section when cut along the thickness direction that is approximately C-shaped, approximately J-shaped, approximately U-shaped, or approximately V-shaped. Note that the locking member may be arranged continuously around the entire outer peripheral side of the drug retention layer 1 and the permeation layer 2 disposed on at least one side thereof, like a picture frame, or multiple locking members may be arranged intermittently at predetermined intervals. In this way, by locking the drug retention layer 1 and the permeation layer 2 with the locking member, it is not necessarily necessary to fix the drug retention layer 1 and the permeation layer 2 by means of fusion, adhesion, or the like. Furthermore, the pesticide-evaporating sheet of the present invention can be stored and used in a container that has holes that allow pesticides such as repellents or insecticides to pass through, and has insertion holes on the side that allow the pesticide-evaporating sheet of the present invention to be inserted and removed, or a container that has a container body and a lid that allow the pesticide-evaporating sheet of the present invention to be inserted and removed.

[0049] The flexural strength of the chemical volatilizing sheet of the present invention is preferably 1.0 to 15.0 MPa, more preferably 1.3 to 13.5 MPa, and most preferably 1.9 to 13.0 MPa. The flexural strength is preferably measured in accordance with the method described in JIS K7171 or the like. When the chemical volatilizing sheet has the flexural strength within the above range, the repellent or insecticide is easily volatilized, the user can be prevented from coming into contact with the chemical retention layer containing the repellent or insecticide, and the sheet can maintain a shape that does not fold or curl even when it comes into contact with clothing.

[0050] The chemical volatilizing sheet of the present invention will be specifically described below, but the present invention is not limited to the following examples.

[0051] [First embodiment] <Example 1> As the drug retention layer 1, a sheet having a thickness of 1.0 mm and a basis weight of 400 g / m2 was uniformly impregnated with 50 mg of transfluthrin. 2 A drug volatilization sheet was prepared by using a rectangular piece of paper (width: 55 mm, length: 85 mm) and fixing a mesh sheet of Reference Example 1, which has an area slightly larger than that of drug retention layer 1, to both sides of drug retention layer 1 with adhesive as a permeation layer 2.

[0052] Examples 2 to 6 Chemical volatilizing sheets were prepared in the same manner as in Example 1, except that the mesh sheets of Examples 2 to 5 and Reference Example 8 were used as the permeable layer 2, respectively.

[0053] Examples 7 to 12: As the drug retention layer 1, a sheet of 0.35 mm thick and 120 g / m2 was uniformly impregnated with 50 mg of transfluthrin. 2 A drug-evaporating sheet was prepared in the same manner as in Example 1, except that rectangular paper (width: 55 mm, length: 85 mm) was used and the mesh sheets of Reference Examples 1 to 5 and Reference Example 8 were used as the permeable layer 2.

[0054] Examples 13 to 15: As the drug retention layer 1, a sheet was prepared by uniformly impregnating 50 mg of transfluthrin, with a thickness of 1.0 mm and a basis weight of 380 g / m 2A drug-evaporating sheet was prepared in the same manner as in Example 1, except that a rectangular (width: 55 mm, length: 85 mm) composite material of paper and rayon (paper:rayon = 20 wt%:80 wt%) was used and the mesh sheets of Reference Examples 1, 5, and 8 were used as the permeable layer 2.

[0055] Examples 16 to 18: As the drug retention layer 1, a sheet of 0.60 mm thick and 180 g / m2 was uniformly impregnated with 50 mg of transfluthrin. 2 A drug-evaporating sheet was prepared in the same manner as in Example 1, except that a rectangular (width: 55 mm, length: 85 mm) composite material of paper and polyethylene (paper:polyethylene = 80% by weight:20% by weight) was used and the mesh sheets of Reference Examples 1, 5, and 8 were used as the permeable layer 2.

[0056] Comparative Example 1 A chemical volatilizing sheet was produced in the same manner as in Example 1, except that the mesh sheet of Reference Example 6 was used as the permeable layer 2 .

[0057] Comparative Examples 2 to 3 As in Examples 6 to 10, the drug retention layer 1 was a 0.35 mm thick sheet with a basis weight of 120 g / m2, which was uniformly impregnated with 50 mg of transfluthrin. 2 A drug volatilizing sheet was prepared in the same manner as in Example 1, except that a rectangular piece of paper (width: 55 mm, length: 85 mm) was used and the mesh sheet of Reference Example 6 was used as the permeable layer 2.

[0058] Comparative Example 4: As the drug retention layer 1, a sheet having a thickness of 1.0 mm and a basis weight of 380 g / m was uniformly impregnated with 50 mg of transfluthrin. 2 A drug-evaporating sheet was prepared in the same manner as in Example 1, using a rectangular (width: 55 mm, length: 85 mm) composite material of paper and rayon (paper:rayon = 20 wt%:80 wt%), and using the mesh sheet of Reference Example 6 as the permeable layer 2.

[0059] Comparative Examples 5 and 6: As the drug retention layer 1, a sheet was prepared by uniformly impregnating 50 mg of transfluthrin, with a thickness of 0.60 mm and a basis weight of 180 g / m 2A drug-evaporating sheet was prepared in the same manner as in Example 1, using a rectangular (width: 55 mm, length: 85 mm) composite material of paper and polyethylene (paper: polyethylene = 80 wt%: 20 wt%), and using the mesh sheets of Reference Examples 6 and 7, respectively, as the permeable layer 2.

[0060] [Second embodiment] <Example 19> As the drug retention layer 1, a sheet having a thickness of 0.35 mm and a basis weight of 120 g / m was uniformly impregnated with 50 mg of transfluthrin. 2 A rectangular piece of paper (width: 55 mm, length: 85 mm) was used, and the mesh sheet of Reference Example 8, which had approximately the same shape as drug retention layer 1, was fixed with adhesive to one side of drug retention layer 1 as permeation layer 2, and polyethylene (thickness: 0.02 mm) having approximately the same shape as drug retention layer 1 was fixed with adhesive to the other side of drug retention layer 1 as barrier layer 4, and an acrylic solvent-based adhesive layer 5 was attached to barrier layer 4 so that it had approximately the same shape as drug retention layer 1, to produce a drug volatilization sheet.

[0061] Example 20 A chemical volatilizing sheet was produced in the same manner as in Example 19, except that the mesh sheet of Reference Example 3 was used as the permeable layer 2 .

[0062] Examples 21 and 22: As the drug retention layer 1, a sheet was prepared, which was uniformly impregnated with 50 mg of transfluthrin, had a thickness of 0.05 mm, and a basis weight of 60 g / m 2 A drug-evaporating sheet was prepared in the same manner as in Example 19, except that rectangular paper (width: 55 mm, length: 85 mm) (paper:olefin = 35 wt%: 65 wt%) was used and the mesh sheets of Reference Example 3 and Reference Example 8 were used as the permeable layer 2.

[0063] Comparative Examples 7 and 8 Chemical volatilizing sheets were prepared in the same manner as in Example 19, except that the mesh sheets of Reference Examples 6 and 7 were used as the permeable layer 2, respectively.

[0064] Comparative Examples 9 and 10 Chemical volatilizing sheets were prepared in the same manner as in Example 21, except that the mesh sheets of Reference Examples 6 and 7 were used as the permeable layer 2, respectively.

[0065] The drug volatilization sheets thus produced were evaluated for shape retention and deformability. As a physical property of the drug volatilization sheets, bending strength was measured in accordance with the above-mentioned JIS test.

[0066] [Shape Retention] The drug volatilizing sheet was hung by fastening a hook-shaped protruding portion at one end to a rod-shaped member arranged horizontally above a closet. Then, multiple hangers holding clothes such as sweatshirts, shirts, suits, and coats were hung on the rod-shaped member so that they abutted against each other. At this time, one side of the drug volatilizing sheet abutted against the front of an adult men's dress shirt (all buttons fastened), and the other side of the drug volatilizing sheet abutted against the front of an adult men's suit (all buttons fastened). The hangers holding the dress shirt and suit were then removed from the rod-shaped member and re-hanged in the same location 50 times each. Each operation of removing the hanger from the rod-shaped member and re-hanging counted as one operation. The state of the drug volatilizing sheet abutting the dress shirt and suit was then visually observed. As a result, the chemical volatilizing sheet that maintained the exact same flat shape as before the test was evaluated as ○, the one that was partially rolled up, such as the lower part, compared to before the test was evaluated as △, and the one that was completely rolled up compared to before the test was evaluated as ×. Of these, ○ and △ were evaluated as good, as they were not rolled up even when in contact with clothing and were unlikely to reduce the pest control effect of the chemical volatilizing sheet, and × was evaluated as poor, as they were likely to roll up overall when in contact with clothing and reduce the pest control effect of the chemical volatilizing sheet.

[0067] [Deformability] The chemical volatilizing sheet was tested in the same manner as in the shape retention test described above. As a result, when the hanger on which the shirt and suit were hung was removed from the rod-shaped member, the chemical volatilizing sheet was evaluated as ○ if it was in contact with the shirt or suit but not pulled out together, △ if it was in contact with the shirt or suit to the extent that it was visible in a portion of the chemical volatilizing sheet, and × if it was in contact with the shirt or suit to the extent that it was visible in the entire chemical volatilizing sheet and pulled out together. Of these, ○ and △ were evaluated as good, as they deformed against the force of pulling out the clothing, thereby alleviating stress and making it less likely to damage the clothing, and × was evaluated as bad, as they could not deform against the force of pulling out the clothing and may damage the clothing.

[0068] The chemical volatilizing sheets of each Example and Comparative Example and the results of the performance evaluations carried out using these are shown in Tables 3 to 7.

[0069]

[0070]

[0071]

[0072]

[0073]

[0074] From the above results, it was found that each Example, in comparison with each Comparative Example, can be deformed when it comes into contact with clothing, but can maintain a shape that does not fold or roll, so that even if a large force is applied to the pesticide volatilization sheet, the pest control effect of the pesticide volatilization sheet is unlikely to be reduced and the clothing is unlikely to be damaged. Therefore, in a pesticide volatilization sheet having a pesticide retention layer 1 sandwiched between permeation layers 2, as long as it has a predetermined bending strength and the ratio of the area of ​​the through holes 21 provided in the permeation layer 2 to the thickness of the permeation layer 2 is within a predetermined range, it is possible to prevent the user from coming into contact with the pesticide retention layer containing the repellent or insecticide, and further, it can be deformed when it comes into contact with clothing, but can maintain a shape that does not fold or roll.

[0075] DESCRIPTION OF SYMBOLS 1: Drug retention layer 2: Permeable layer 21: Through-hole 3: Label portion 4: Barrier layer 5: Adhesive layer

Claims

1. A chemical volatilizing sheet comprising: a chemical retention layer impregnated with at least one of a repellent or an insecticide; and a permeable layer disposed on at least one side of the chemical retention layer and having through holes that allow the repellent and the insecticide to pass through, wherein the bending strength is 1.0 to 15.0 MPa, and the ratio of the area of the through holes to the thickness of the permeable layer is such that the area of the through holes / the thickness of the permeable layer = 0.3 to 40.

2. A drug volatilizing sheet as described in claim 1, characterized in that the permeable layer is disposed on both sides of the drug retention layer.

3. A chemical volatilizing sheet as described in claim 1, characterized in that the permeable layer is disposed on one side of the chemical retention layer, and the sheet is provided with a barrier layer on the other side of the chemical retention layer that is impermeable to the repellent or insecticide, and an adhesive layer on the barrier layer that is disposed on the opposite side of the chemical retention layer and can be adhered to an object to be adhered to.

4. A drug volatilizing sheet as described in claim 1 or claim 2, characterized in that it has a label portion provided on the outer surface of the drug retention layer.

5. A drug volatilizing sheet as described in any one of claims 1 to 3, characterized in that the drug retention layer is formed from at least one of paper, nonwoven fabric, and woven fabric.

6. A drug-evaporating sheet described in any one of claims 1 to 3, characterized in that the permeable layer is formed from one material selected from polyolefin, fluororesin, polyethylene terephthalate, and ethylene-vinyl alcohol copolymer.

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