Aqueous aerosol product for indoor pest control, indoor pest control method, and method of using the aqueous aerosol product for indoor pest control

Abstract

Provided is an indoor pest control water-based aerosol product that is suitable for performing pest control in an indoor space.　The present invention provides an indoor pest control water-based aerosol product for performing pest control in an indoor space, the indoor pest control water-based aerosol product including: a pressure-resistant container filled with an aerosol composition that contains a propellant (G) and an aerosol stock solution (L) containing (a) an insecticidal component, (b) a hydrocarbon solvent, (c) a surfactant, and (d) water; and a jetting nozzle that is attached to the pressure-resistant container and that has a nozzle hole from which the aerosol composition is jetted in the form of spray particles, wherein the 50% particle diameter [D(50)] of the spray particles is set so as to be 18-70 µm at a position separated from the nozzle hole by 30 cm.

Description

[Technical Field]

[0001] The present invention relates to an aqueous aerosol product for controlling indoor pests, a method for controlling indoor pests using the same, and a method for using the aqueous aerosol product for controlling indoor pests. [Background technology]

[0002] BACKGROUND ART Conventionally, from the viewpoint of reducing the risk of fire and taking environmental issues into consideration, pest control methods using aqueous aerosol products obtained by blending water into an aerosol concentrate have been proposed.

[0003] For example, taking into consideration the difference in design of aerosol products for indoor and outdoor use, a method for controlling mosquitoes outdoors has been proposed in which an aerosol product consisting of an insecticidal component, a solvent, a solubilizer, water, and a propellant is sprayed at a spray rate of 1.5 mL / sec so that the average particle diameter of the sprayed particles is 20 to 100 μm over a spray distance of 1 to 3 m (see Patent Document 1). This control method is said to enable the insecticidal component to reach gaps in thickets of plants or in the shade of objects without being affected by wind when controlling mosquitoes outdoors. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2000-178101 Summary of the Invention [Problem to be solved by the invention]

[0005] However, as shown in Patent Document 1, conventionally, the design concepts of aerosol products for indoor and outdoor use have differed, and it is difficult to say that the outdoor aerosol products are suitable for indoor use, where obstacles have a significant impact on pest control.

[0006] Here, in order to control pests such as cockroaches indoors, it is effective to attach spray particles to floors or other areas where pests reside or wander. However, although the space to be controlled indoors is smaller than outdoors, there are obstacles, such as tables, chairs, furniture, and ornamental plants, that are relatively large compared to the size of the space. For this reason, when controlling pests indoors, the presence of obstacles greatly hinders the diffusion of spray particles compared to when controlling pests outdoors, making it difficult to attach spray particles over a wide area to the target objects such as floors, and there is a risk that the control effect of the spray particles will be reduced. For this reason, when controlling pests indoors, it is necessary to prevent the spray particles from attaching to obstacles. On the other hand, it is necessary to sufficiently attach the spray particles to the target objects such as floors.

[0007] The present invention has been made in consideration of the above circumstances, and aims to provide an aqueous aerosol product for indoor pest control that is suitable for controlling pests indoors, an indoor pest control method using the same, and a method for using the aqueous aerosol product for indoor pest control. [Means for solving the problem]

[0008] The characteristic configuration of the aqueous aerosol product for indoor pest control according to the present invention for solving the above problems is as follows: An aqueous aerosol product for indoor pest control for controlling pests indoors, a pressure-resistant container filled with an aerosol composition containing an aerosol concentrate (L) containing (a) an insecticidal component, (b) a hydrocarbon solvent, (c) a surfactant, and (d) water, and a propellant (G); a spray nozzle attached to the pressure-resistant container and having a nozzle for spraying the aerosol composition as spray particles; Equipped with The 50% particle diameter [D(50)] of the spray particles is set to be 18 to 70 μm at a position 30 cm away from the nozzle.

[0009] According to the aqueous aerosol product for indoor pest control having this configuration, (a) spray particles containing an insecticidal component are less likely to adhere to obstacles indoors, but are more likely to adhere to targets such as floors. Specifically, by setting the 50% particle diameter [D(50)] of the spray particles to 18 μm or greater, the spray particles are prevented from becoming too fine and thus difficult to fall, allowing a sufficient amount of spray particles to adhere to targets such as indoor floors where pests may reside or roam. Furthermore, by setting the 50% particle diameter [D(50)] of the spray particles to 70 μm or less, the spray particles are prevented from adhering to obstacles, allowing the spray particles to reach and adhere to a wider range of targets. This increases the amount and range of adhesion of the spray particles to targets, thereby enhancing the pest control effect. Therefore, the aqueous aerosol product for indoor pest control is suitable for indoor pest control.

[0010] In the aqueous aerosol product for indoor pest control according to the present invention, It is preferable that the 50% particle diameter [D(50)] of the spray particles is set to be 18 to 50 μm.

[0011] According to the aqueous aerosol product for indoor pest control of this configuration, (a) spray particles containing an insecticidal component are less likely to adhere to obstacles indoors, while being more likely to adhere to objects such as floors, and therefore the aqueous aerosol product for indoor pest control has an improved effect of controlling pests indoors.

[0012] In the aqueous aerosol product for indoor pest control according to the present invention, It is preferable that the ratio [D(90) / D(10)] of the 90% particle diameter [D(90)] of the spray particles to the 10% particle diameter [D(10)] of the spray particles at a position 30 cm away from the nozzle be set to 8.0 or less.

[0013] The aqueous aerosol product for indoor pest control having this configuration has an appropriate ratio of relatively fine spray particles to relatively coarse spray particles among all spray particles, which makes it difficult for spray particles containing the insecticidal component (a) to adhere to obstacles indoors, while making it easier for them to adhere to objects such as floors, thereby improving the effectiveness of the aqueous aerosol product for indoor pest control against indoor pests.

[0014] In the aqueous aerosol product for indoor pest control according to the present invention, It is preferable that the 90% particle diameter [D(90)] of the spray particles is set to be 38 to 100 μm.

[0015] The aqueous aerosol product for indoor pest control having this configuration has an appropriate content ratio of relatively coarse spray particles among all spray particles, which makes it difficult for the spray particles containing the insecticidal component (a) to adhere to obstacles indoors, while making them more likely to adhere to objects such as floors, thereby improving the effectiveness of the aqueous aerosol product for indoor pest control against indoor pests.

[0016] In the aqueous aerosol product for indoor pest control according to the present invention, It is preferable that the 10% particle diameter [D(10)] of the spray particles is set to be 9 to 20 μm.

[0017] The aqueous aerosol product for indoor pest control having this configuration has an appropriate content ratio of relatively fine spray particles among all spray particles, which makes it possible to make the spray particles containing (a) the insecticidal component less likely to adhere to obstacles indoors and more likely to adhere to objects such as floors, thereby improving the effectiveness of the aqueous aerosol product for indoor pest control against indoor pests.

[0018] In the aqueous aerosol product for indoor pest control according to the present invention, The volume ratio (L / G) of the aerosol concentrate (L) to the propellant (G) is preferably 15 / 85 to 70 / 30.

[0019] The aqueous aerosol product for indoor pest control having this configuration has a spray particle diameter adjusted to a more appropriate range, which makes it more difficult for the spray particles containing the insecticidal component (a) to adhere to obstacles indoors, while making it easier for them to adhere to objects such as floors, thereby improving the effectiveness of the aqueous aerosol product for indoor pest control against indoor pests.

[0020] In the aqueous aerosol product for indoor pest control according to the present invention, The contents of (b) hydrocarbon solvent, (c) surfactant, and (d) water contained in the aerosol concentrate (L) are in the following order of magnitude: (b) Hydrocarbon solvent > (d) Water > (c) Surfactant It is preferable that the value is set so as to satisfy the following.

[0021] According to the aqueous aerosol product for indoor pest control of this configuration, the contents of (b) hydrocarbon solvent, (c) surfactant, and (d) water blended in the aerosol concentrate (L) are set so that the magnitude relationship of (b) hydrocarbon solvent > (d) water > (c) surfactant is satisfied, which makes it easier to achieve the effect of the present invention, that is, to suppress adhesion of spray particles to obstacles while allowing spray particles to reach and adhere to a wide range of target objects.

[0022] In the aqueous aerosol product for indoor pest control according to the present invention, Preferably, the pest is a cockroach.

[0023] Cockroaches have a habit of hiding in gaps between obstacles, such as on the floor, so if the spray particles are prone to adhering to the obstacles, the presence of the obstacles will get in the way, making it difficult for the spray particles to reach the gaps sufficiently, and ultimately making it difficult to fully exert the cockroach control effect. However, this aqueous aerosol product for indoor pest control can prevent the spray particles from adhering to obstacles indoors, allowing the spray particles to fully reach the gaps where cockroaches hide. Therefore, when the pest to be controlled is cockroaches, the effectiveness of this aqueous aerosol product for indoor pest control is particularly pronounced.

[0024] The characteristic configuration of the indoor pest control method according to the present invention for solving the above problems is as follows: The above-mentioned aqueous aerosol product for controlling indoor pests is used to spray the aerosol composition indoors as spray particles.

[0025] According to this indoor pest control method, when spray particles containing an insecticidal component (a) are sprayed from a nozzle indoors, the spray particles are less likely to adhere to obstacles but more likely to adhere to targets such as floors. This increases the amount and range of adhesion of the spray particles to the target, thereby improving the pest control effect. Therefore, this indoor pest control method is suitable for controlling pests indoors.

[0026] The method for using the aqueous aerosol product for indoor pest control according to the present invention to solve the above problems is characterized by the following features: a pressure-resistant container filled with an aerosol composition containing an aerosol concentrate (L) containing (a) an insecticidal component, (b) a hydrocarbon solvent, (c) a surfactant, and (d) water, and a propellant (G); a spray nozzle attached to the pressure-resistant container and having a nozzle for spraying the aerosol composition as spray particles; A method for using an aqueous aerosol product for indoor pest control, comprising: The aqueous aerosol product for indoor pest control is sprayed in an indoor space where an obstacle is present on the floor so that the spray particles adhere preferentially to the floor rather than to the obstacle.

[0027] According to the method of using the aqueous aerosol product for indoor pest control of this configuration, the aqueous aerosol product for indoor pest control is sprayed in an indoor space where there are obstacles on the floor so that the spray particles sprayed from the aqueous aerosol product for indoor pest control adhere preferentially to the floor rather than to the obstacles. Therefore, even if there are obstacles indoors that are relatively large compared to the size of the space, such as tables, chairs, furniture, or ornamental plants, pests such as cockroaches will reliably come into contact with the spray particles adhering to the floor, thereby enhancing the pest control effect.

[0028] In the method for using the aqueous aerosol product for indoor pest control according to the present invention, It is preferable that the aqueous aerosol product for indoor pest control is sprayed toward the space formed by the obstacle.

[0029] According to the method of using the aqueous aerosol product for indoor pest control of this configuration, the aqueous aerosol product for indoor pest control can be sprayed not only directly toward the target pest, but also toward spaces (including gaps) formed between obstacles or between an obstacle and a wall, thereby more reliably controlling pests such as cockroaches that lurk in those spaces. DETAILED DESCRIPTION OF THE INVENTION

[0030] Hereinafter, embodiments of the aqueous aerosol product for indoor pest control, the indoor pest control method using the same, and the method of using the aqueous aerosol product for indoor pest control of the present invention will be described. However, the present invention is not intended to be limited to the configurations described in the embodiments described below. In this specification, when a numerical range is indicated by "to", the numerical range includes the numerical values ​​between the "to" as upper and lower limits. The numerical range may also be formed by appropriately combining the upper and lower limits. Furthermore, in this specification, the content unit "w / v%" is synonymous with "g / 100 mL". Furthermore, "spraying indoors" includes not only spraying an aqueous aerosol product for indoor pest control indoors while the product is placed indoors, but also spraying an aqueous aerosol product for indoor pest control from outdoors to indoors while the product is placed outdoors.

[0031] [Water-based aerosol product for indoor pest control] The aqueous aerosol product for indoor pest control of this embodiment is an aqueous aerosol product for indoor pest control that controls pests indoors. This aqueous aerosol product for indoor pest control is prepared by filling a pressure-resistant container with an aerosol composition containing an aerosol concentrate (L) containing (a) an insecticidal component, (b) a hydrocarbon solvent, (c) a surfactant, and (d) water, and a propellant (G), and attaching a spray nozzle to the pressure-resistant container. The spray nozzle has a nozzle opening, and when the spray nozzle is operated, the aerosol composition is sprayed as spray particles from the nozzle opening. The pressure-resistant container (aerosol container) can be an aerosol can equipped with a spray valve (aerosol valve). The spray nozzle can be equipped with an actuator (spray member) that functions as an actuator for spraying the aerosol composition. The spray nozzle can be either a spray nozzle with a switchable nozzle length or a regular spray nozzle with a fixed nozzle length. The actuator is attached to the spray valve.

[0032] <(a) Insecticidal ingredient> (a) The insecticidal component is not particularly limited, but includes pyrethroid insecticidal components such as phenothrin, permethrin, cyphenothrin, cypermethrin, cyfluthrin, resmethrin, phthalthrin, momfluorothrin, allethrin, prallethrin, furamethrin, imiprothrin, transfluthrin, metofluthrin, profluthrin, fenpropathrin, etofenprox, pyrethrin I, pyrethrin II, cinerin I, cinerin II, jasmolin I, jasmolin II, natural pyrethrins (mixtures of pyrethrin I, pyrethrin II, cinerin I, cinerin II, jasmolin I, and jasmolin II), silicon-based insecticidal components such as silafluofen, organophosphorus insecticidal components, etc. Among these, pyrethroid insecticidal components and / or silicon-based insecticidal components are preferred in terms of efficacy and safety. When the above compounds contain asymmetric carbons or double bonds in their chemical structures and thus have optical isomers or geometric isomers based on these, these isomers or any mixtures of these isomers are also included in the (a) insecticidal component. The (a) insecticidal component can be used singly or as a mixture of two or more types.

[0033] The amount of the insecticidal component (a) in the aerosol concentrate (L) is preferably 0.01 to 20 w / v%, more preferably 0.05 to 15 w / v%, and even more preferably 0.1 to 10 w / v%. The amount of the insecticidal component (a) in the aerosol concentrate (L) may be 0.1 to 5 w / v%, 0.1 to 3 w / v%, 0.1 to 2 w / v%, or even 0.1 to 1 w / v%. By ensuring that the amount of the insecticidal component (a) in the aerosol concentrate (L) is within the above range, the content of the insecticidal component (a) in the aerosol concentrate (L) and, ultimately, in the spray particles can be made more appropriate, thereby improving the effectiveness of the aqueous aerosol product for indoor pest control against indoor pests such as cockroaches.

[0034] (b) Hydrocarbon solvents (b) The hydrocarbon solvent is not particularly limited, but examples thereof include aliphatic hydrocarbon solvents such as paraffinic hydrocarbons and naphthenic hydrocarbons. Among these, normal paraffin, isoparaffin, and liquid paraffin are preferred, with normal paraffin being more preferred. The hydrocarbon solvent preferably has 8 to 20 carbon atoms, more preferably 8 to 16. Examples of such normal paraffins include normal octane, normal nonane, normal decane, normal undecane, normal dodecane, normal tridecane, normal tetradecane, normal pentadecane, and normal hexadecane. Commercially available products containing these components, such as Neothiosol (manufactured by Chuo Kasei Co., Ltd.), can also be used. Examples of the isoparaffin include isooctane, isononane, isodecane, isoundecane, isododecane, isotridecane, isotetradecane, isopentadecane, and isohexadecane. Commercially available products containing these components, such as Isopar M (manufactured by Exxon Mobil Corp.), Isopar H (manufactured by Exxon Mobil Corp.), Isopar L (manufactured by Exxon Mobil Corp.), and IP Clean LX (manufactured by Idemitsu Kosan Co., Ltd.), can also be used. Commercially available liquid paraffins, such as Liquid Paraffin 40S, can be used. When the aerosol composition forms an aqueous emulsion, the (b) hydrocarbon solvent becomes its oily component. The (b) hydrocarbon solvent can be used alone or as a mixture of two or more.

[0035] The amount of (b) hydrocarbon solvent in the aerosol concentrate (L) is preferably 3 to 95 w / v%, more preferably 3 to 70 w / v%, more preferably 15 to 65 w / v%, and even more preferably 30 to 60 w / v%. Alternatively, the amount of (b) hydrocarbon solvent in the aerosol concentrate (L) may be 40 to 60 w / v%. When the amount of (b) hydrocarbon solvent in the aerosol concentrate (L) is within the above range, the amount of (b) hydrocarbon solvent in the aerosol concentrate (L) and, ultimately, in the aerosol composition is more appropriate. This makes it more difficult for spray particles containing the (a) insecticidal component to adhere to obstacles indoors, while making them more likely to adhere to objects such as floors. Therefore, the aqueous aerosol product for indoor pest control has improved indoor pest control efficacy.

[0036] <(c) Surfactant> The (c) surfactant is not particularly limited, but includes nonionic surfactants, anionic surfactants, cationic surfactants, and amphoteric surfactants, among which nonionic surfactants are preferred. Examples of such nonionic surfactants include sorbitan fatty acid esters such as sorbitan monolaurate, sorbitan monooleate, sorbitan sesquioleate, sorbitan trioleate, and sorbitan monostearate; polyoxyethylene polyoxypropylene cetyl ether, polyoxyethylene polyoxypropylene lauryl ether, polyoxyethylene polyoxypropylene stearyl ether, and polyoxyethylene polyoxypropylene decyltetradecyl ether; polyethylene glycol alkyl esters such as polyethylene glycol laurate, polyethylene glycol oleate, and polyethylene glycol stearate; and polyglycerin fatty acid esters such as diglyceryl monooleate and tetraglyceryl monooleate. The (c) surfactant functions as an emulsifier when the aerosol composition forms an aqueous emulsion. (c) The surfactants may be used singly or as a mixture of two or more kinds.

[0037] The amount of surfactant (c) in the aerosol concentrate (L) is preferably 0.5 to 25 w / v%, more preferably 1 to 20 w / v%, and even more preferably 5 to 15 w / v%. The amount of surfactant (c) in the aerosol concentrate (L) may be 7 to 15 w / v%, or even 9 to 15 w / v%. When the amount of surfactant (c) in the aerosol concentrate (L) is within the above range, the amount of surfactant (c) in the aerosol concentrate (L) and, ultimately, in the aerosol composition is more appropriate. This makes it more difficult for spray particles containing the insecticidal component (a) to adhere to obstacles indoors, while making them more likely to adhere to objects such as floors. Therefore, the aqueous aerosol product for indoor pest control has improved indoor pest control efficacy.

[0038] <(d)Water> (d) Water is not particularly limited, and examples thereof include tap water, distilled water, purified water, and deep-sea water. (d) Water may be used singly or as a mixture of two or more types. When the aerosol composition forms an aqueous emulsion, (d) Water is an aqueous component thereof.

[0039] The amount of (d) water in the aerosol concentrate (L) is preferably 3 to 90 w / v%, more preferably 5 to 70 w / v%, and even more preferably 10 to 50 w / v%. The amount of (d) water in the aerosol concentrate (L) may be 20 to 50 w / v%, 30 to 50 w / v%, 35 to 50 w / v%, or even 40 to 50 w / v%. When the amount of (d) water in the aerosol concentrate (L) is within the above range, the amount of (d) water in the aerosol concentrate (L) and, ultimately, the aerosol composition is more appropriate. This makes it more difficult for spray particles containing the (a) insecticidal component to adhere to obstacles indoors, while making them more likely to adhere to objects such as floors. Therefore, the aqueous aerosol product for indoor pest control has improved indoor pest control efficacy.

[0040] The contents of (b) hydrocarbon solvent, (c) surfactant, and (d) water contained in the aerosol concentrate (L) are in the following order of magnitude: (b) Hydrocarbon solvent > (d) Water > (c) Surfactant By setting the contents of the components blended in the aerosol concentrate (L) so as to satisfy this magnitude relationship, it becomes easier to achieve the effect of the present invention, which is to suppress adhesion of the spray particles to obstacles while allowing the spray particles to reach and adhere to a wide range of target objects.

[0041] <Other ingredients in the aerosol concentrate (L)> In addition to the components (a) to (d) above, the aerosol concentrate (L) may also contain a miticide, an antifungal agent for fungi, molds, and bacteria, as appropriate. Examples of miticides include methyl 5-chloro-2-trifluoromethanesulfonamidobenzoate, phenyl salicylate, and 3-iodo-2-propynyl butylcarbamate. Examples of antifungal agents, antifungal agents, and bacteria include 2-mercaptobenzothiazole, 2-(4-thiazolyl)benzimidazole, triforine, 3-methyl-4-isopropylphenol, and ortho-phenylphenol. In addition, the aerosol concentrate (L) may also contain a synergist, stabilizer, fragrance, excipient, and the like, as appropriate.

[0042] <Propellant (G)> Examples of the propellant (G) include liquefied petroleum gases (LPG) such as propane, normal butane, and isobutane; liquefied gases other than liquefied petroleum gases, such as normal pentane, isopentane, dimethyl ether (DME), and hydrofluoroolefins such as HFO1234ze; and compressed gases such as nitrogen gas, carbon dioxide gas, nitrous oxide, and compressed air. From the viewpoint of ease of use, propellants (G) containing LPG as the main component are preferred. The propellant (G) can be used alone or as a mixture of two or more types. The propellant (G) is preferably used with a gauge pressure (20°C) adjusted to 0.1 to 0.7 MPa, more preferably 0.1 to 0.5 MPa, and even more preferably 0.2 to 0.4 MPa. By keeping the gauge pressure within the above range, the particle size of the spray particles can be adjusted to a more appropriate range. This makes it more difficult for spray particles containing (a) insecticidal ingredients to adhere to obstacles indoors, while making them more likely to adhere to objects such as floors, thereby improving the effectiveness of the aqueous aerosol product for indoor pest control in controlling pests indoors.

[0043] The volume ratio (L / G) of the aerosol concentrate (L) to the propellant (G) is preferably 15 / 85 to 70 / 30, more preferably 20 / 80 to 70 / 30, and even more preferably 20 / 80 to 60 / 40. The volume ratio (L / G) may also be 20 / 80 to 50 / 50. When the volume ratio (L / G) is within the above range, the volume ratio (L / G) of the aerosol concentrate (L) to the propellant (G) becomes more appropriate, and the particle size of the spray particles is adjusted to a more appropriate range. This makes it more difficult for the spray particles containing the insecticidal component (a) to adhere to obstacles indoors, while making them more likely to adhere to objects such as floors, thereby improving the indoor pest control effect of the aqueous aerosol product.

[0044] <Preparation of aqueous aerosol products for indoor pest control> The aqueous aerosol product for indoor pest control is produced by filling an aerosol composition consisting of the above-mentioned aerosol concentrate (L) and propellant (G) into a pressure-resistant container for aerosols (such as an aerosol can), closing the opening with an aerosol valve, and attaching an actuator equipped with a spray nozzle having an outlet to the aerosol valve.

[0045] <Characteristics of water-based aerosol products for indoor pest control> In this aqueous aerosol product for indoor pest control, the 50% particle diameter [D(50)] of the spray particles is set to 18 to 70 μm at a position 30 cm away from the nozzle. The 50% particle diameter [D(50)] of the spray particles is preferably 18 to 50 μm, more preferably 18 to 40 μm. By setting the 50% particle diameter [D(50)] of the spray particles to be within the above range, indoors, spray particles containing (a) an insecticidal component are less likely to adhere to obstacles, but are more likely to adhere to targets such as floors. In other words, the spray particles preferentially adhere to floors rather than obstacles. In particular, by setting the 50% particle diameter [D(50)] of the spray particles to be 18 μm or more, it is possible to prevent the spray particles from becoming too fine and thus having difficulty falling, thereby enabling a sufficient amount of spray particles to adhere to targets such as indoor floors where pests reside or roam. Furthermore, by setting the 50% particle diameter [D(50)] of the spray particles to 70 μm or less, it is possible to prevent the spray particles from adhering to obstacles, and therefore the spray particles can reach and adhere to a wide range of the above-mentioned objects.

[0046] The reason (mechanism) why adhesion of spray particles to obstacles can be suppressed when the 50% particle diameter [D(50)] of the spray particles is equal to or less than a predetermined size (70 μm or less in the present invention) has not yet been fully elucidated, but one hypothesis can be considered as follows.

[0047] Because the aerosol product of the present invention is an aqueous aerosol product, its spray particles behave differently from those of oil-based aerosol products. In the aqueous aerosol product for indoor pest control of the present invention, among the components contained in the aerosol concentrate (L), (b) hydrocarbon solvent, (c) surfactant, and (d) water contribute to the solubility of (a) the insecticidal component, and (c) surfactant in particular is thought to affect the interfacial activity of the resulting spray particles. The interfacial action of (c) surfactant generally favors surface conformation. However, in the aqueous aerosol product for indoor pest control of the present invention, contrary to expectations, spray particles with a specific particle size of 50% particle size [D(50)] of 70 μm or less exhibit a unique property of being less likely to adhere to obstacles due to interfacial activity with the obstacle surface, compared to larger spray particles with a 50% particle size [D(50)] exceeding 70 μm, due to the movement speed caused by spraying. This unique property (phenomenon) is more pronounced when the spray particles flow along the surface of the gap between the obstacles than when the spray particles are sprayed perpendicular to the obstacles.

[0048] Thus, with the aqueous aerosol product for indoor pest control of the present invention, by setting the 50% particle diameter [D(50)] of the spray particles at a position 30 cm away from the nozzle within an appropriate range, the amount and range of adhesion of the spray particles to the target object can be increased, thereby improving the pest control effect. Therefore, this aqueous aerosol product for indoor pest control is suitable for controlling pests indoors. Furthermore, by suppressing adhesion to obstacles, the possibility of contamination and dirt on the obstacles and discoloration of furniture can be suppressed.

[0049] The 50% particle diameter [D(50)] of spray particles is the 50% particle diameter [D(50)] of spray particles based on the volume integral distribution, and refers to the 50% particle diameter [D(50)] measured by a particle size distribution analyzer and analyzed by an automatic processing device. Specifically, the 50% particle diameter [D(50)] is measured at 25°C using a laser particle size distribution analyzer (SPRAYTEC model STP5321, manufactured by Malvern) and the position of the indoor pest control aqueous aerosol product is adjusted so that the distance between the laser beam irradiated from the laser light emitter to the light receiver and the nozzle of the indoor pest control aqueous aerosol product is 30 cm, and the spray particles pass perpendicularly through the laser beam. Then, while the aerosol composition is being sprayed from the nozzle, measurements are taken during spraying, and the particle size distribution of the spray particles is analyzed by an automatic processing device, thereby obtaining the 50% particle diameter [D(50)] of spray particles based on the volume integral distribution. The 90% particle size [D(90)] of spray particles and the 10% particle size [D(10)] of spray particles, which will be described later, can also be obtained in a similar manner. As described above, the 10% particle size [D(10)], 50% particle size [D(50)], and 90% particle size [D(90)] of spray particles based on the volume integral distribution are measured as particle sizes corresponding to 10%, 50%, and 90% integrated volume, respectively, on a volume integral distribution curve showing the relationship between particle size (μm) and integrated (cumulative) volume (%) obtained by measurement with a particle size distribution analyzer.

[0050] In the aqueous aerosol product for indoor pest control, the ratio of the 90% particle diameter [D(90)] of the spray particles to the 10% particle diameter [D(10)] at a position 30 cm away from the nozzle, [D(90) / D(10)], is preferably set to 9 or less [D(90) / D(10)≦9], more preferably 8.0 or less [D(90) / D(10)≦8.0], even more preferably 3 to 8.0 [3≦D(90) / D(10)≦8.0], even more preferably 3 to 7 [3≦D(90) / D(10)≦7], even more preferably 3.5 to 6 [3.5≦D(90) / D(10)≦6], and even more preferably 3.5 to 5.5 [3.5≦D(90) / D(10)≦5.5]. The ratio [D(90) / D(10)] may be 3.5 to 5.0 [3.5≦D(90) / D(10)≦5.0]. By setting the ratio [D(90) / D(10)] within the above range, the content ratio of relatively fine spray particles to relatively coarse spray particles among all spray particles is appropriate. This makes it possible to make spray particles containing (a) the insecticidal component less likely to adhere to obstacles indoors, while making them more likely to adhere to target objects such as floors, thereby improving the indoor pest control effect of the aqueous aerosol product.

[0051] In the aqueous aerosol product for indoor pest control of this embodiment, the 90% particle diameter [D(90)] of the spray particles at a position 30 cm away from the nozzle is preferably set to be 38 to 200 μm, more preferably 38 to 100 μm, even more preferably 38 to 80 μm, and even more preferably 38 to 60 μm. Setting the 90% particle diameter [D(90)] of the spray particles to be within the above range ensures an appropriate proportion of relatively coarse spray particles among all spray particles. This makes it more difficult for spray particles containing (a) the insecticidal component to adhere to obstacles indoors, while making them more likely to adhere to objects such as floors, thereby improving the indoor pest control effect of the aqueous aerosol product for indoor pest control.

[0052] In the aqueous aerosol product for indoor pest control of this embodiment, the 10% particle size [D(10)] of the spray particles at a position 30 cm away from the nozzle is preferably set to be 9 to 30 μm, more preferably 9 to 25 μm, and even more preferably 9 to 20 μm. By setting the 10% particle size [D(10)] of the spray particles to be within the above range, the content ratio of relatively fine spray particles among all spray particles is appropriate. This makes it possible to make spray particles containing (a) the insecticidal component less likely to adhere to obstacles indoors while making them more likely to adhere to objects such as floors, thereby improving the indoor pest control effect of the aqueous aerosol product for indoor pest control.

[0053] The 50% particle size [D(50)], 90% particle size [D(90)], 10% particle size [D(10)], and ratio [D(90) / D(10)] of the spray particles described above can be set within the desired range by appropriately setting the types of (a) insecticidal component, (b) hydrocarbon solvent, and (c) surfactant, the amounts of these components in the aerosol concentrate (L), the volume ratio (L / G) of the aerosol concentrate (L) to the propellant (G), and the spray force.

[0054] As described above, the aqueous aerosol product for indoor pest control is designed so that the 50% particle diameter [D(50)] of the spray particles is 18 to 70 μm at a position 30 cm away from the nozzle, so that (a) the spray particles containing the insecticidal component are less likely to adhere to obstacles indoors, but are more likely to adhere to targets such as floors. This increases the amount and range of adhesion of the spray particles to targets, making the aqueous aerosol product for indoor pest control suitable for controlling pests indoors.

[0055] [Indoor pest control methods] The indoor pest control method of this embodiment is a method in which the above-described aqueous aerosol product for controlling indoor pests is used to spray the aerosol composition indoors as spray particles.

[0056] According to the indoor pest control method of this embodiment, the aqueous aerosol product for indoor pest control described above can be used to spray the aerosol composition as spray particles from a nozzle indoors. As described above, the aqueous aerosol product for indoor pest control is designed so that the 50% particle diameter [D(50)] of the spray particles is 18 to 70 μm at a position 30 cm away from the nozzle. Therefore, when spray particles containing (a) an insecticidal component are sprayed from the nozzle indoors, the spray particles are less likely to adhere to obstacles but more likely to adhere to objects such as floors, thereby increasing the amount and range of adhesion of the spray particles to the objects. Therefore, this indoor pest control method is suitable for controlling pests indoors.

[0057] [How to use water-based aerosol products for indoor pest control] The method of using the aqueous aerosol product for indoor pest control of this embodiment involves spraying the aqueous aerosol product for indoor pest control in an indoor space where there are obstacles on the floor so that the spray particles adhere preferentially to the floor rather than the obstacles.

[0058] According to the method for using the aqueous aerosol product for indoor pest control of this embodiment, not only is the aqueous aerosol product sprayed directly toward the target pests, but the aqueous aerosol product is also sprayed in an indoor space where there are obstacles on the floor so that the spray particles sprayed from the aqueous aerosol product for indoor pest control preferentially adhere to the floor rather than the obstacles, so that even if there are obstacles such as tables, chairs, furniture, or ornamental plants that are relatively large compared to the size of the space, pests such as cockroaches will reliably come into contact with the spray particles that have adhered to the floor, thereby enhancing the pest control effect. When carrying out the method for using the aqueous aerosol product for indoor pest control of this embodiment, it is preferable to spray the aqueous aerosol product for indoor pest control toward the space formed by the obstacles. By spraying an aqueous aerosol product for indoor pest control into spaces formed between obstacles (for example, the gap between two dressers) or between an obstacle and a wall (for example, between a dresser and a wall), pests such as cockroaches hiding in the space can be controlled more reliably, just as if the product were sprayed directly toward the target pest.

[0059] [Applicable space] The space to which the aqueous aerosol product for indoor pest control and the indoor pest control method of this embodiment can be applied is not particularly limited as long as it is an indoor space, and examples include closets, storage rooms, chests of drawers, cupboards, toilets, bathrooms, storage rooms, living rooms, dining rooms, warehouses, the inside of cars, furniture, and spaces between furniture.

[0060] [Pests to be controlled] Examples of pests to be controlled in this embodiment include cockroaches such as the Smoky Brown cockroach, German cockroach, Japanese cockroach, American cockroach, and Brown cockroach, spiders, centipedes, ants, house centipedes, millipedes, pill bugs, woodlice, termites, caterpillars, mites, lice, ticks, and bedbugs, as well as flying pests such as mosquitoes, flies, moths, wasps, stink bugs, dermestid beetles, beetles, wood beetles, burrs moths, and box moths. Among these, the agent can be suitably used against creeping pests that are particularly problematic indoors, and is even more suitably used against cockroaches. Cockroaches have a habit of hiding in gaps between obstacles, such as on the floor, so if the spray particles are prone to adhering to the obstacles, the presence of the obstacles will interfere, making it difficult for the spray particles to reach the gaps sufficiently, and ultimately making it difficult to fully exert the control effect against cockroaches. However, the aqueous aerosol product for indoor pest control and the indoor pest control method can prevent the spray particles from adhering to obstacles indoors, allowing the spray particles to fully reach the gaps where cockroaches hide. Therefore, when the pest to be controlled is cockroaches, the effect of this embodiment is particularly pronounced. [Example]

[0061] EXAMPLES The present invention will be described in more detail below with reference to examples and comparative examples, but the present invention is not limited to these examples.

[0062] [Example 1] As shown in Table 1, 200 mL of aerosol concentrate (L) was prepared by mixing (a) 0.6 g of imiprothrin and 0.6 g of fenothrin as insecticidal ingredients, (b) 100 g of a normal paraffinic hydrocarbon with 11 to 14 carbon atoms (Neothiosol, manufactured by Chuo Kasei Co., Ltd.) as a hydrocarbon solvent, (c) 24 g of surfactant A (based on polyethylene glycol monooleate (polyethylene glycol oleate)) as a surfactant, and (d) water as the remainder. 60 mL of this aerosol concentrate (L) and 140 mL of liquefied petroleum gas (LPG) [0.34 MPa (20°C)] as a propellant (G) were pressurized and filled into an aerosol container (pressure-resistant container) equipped with an aerosol valve, with a volume ratio of aerosol concentrate (L) to propellant (G) (L / G) of 30 / 70. An actuator equipped with a spray nozzle was then attached to the aerosol valve to obtain the aqueous aerosol product for indoor pest control of Example 1.

[0063] [Examples 2 to 8, Comparative Examples 1 and 2] Aqueous aerosol products for indoor pest control of Examples 2 to 8 and Comparative Examples 1 and 2 were obtained in the same manner as in Example 1, except that the aqueous aerosol products for indoor pest control were prepared according to the formulations shown in Table 1. In Table 1, surfactant B is primarily composed of sorbitan monolaurate (sorbitan monolaurate).

[0064] [Table 1]

[0065] [Measurement of spray particle size and calculation of particle size ratio] For the aqueous aerosol product for indoor pest control of Example 1, the 10% particle size [D(10)], 50% particle size [D(50)], and 90% particle size [D(90)] of the spray particles were measured at a position 30 cm away from the nozzle of this aqueous aerosol product for indoor pest control according to the measurement method described above. The ratio [D(90) / D(10)] of the 90% particle size [D(90)] and the 10% particle size [D(10)] was calculated using these values. As a result, the 50% particle size [D(50)] of the spray particles was 26 μm, the 90% particle size [D(90)] was 57 μm, the 10% particle size [D(10)] was 11 μm, and the ratio [D(90) / D(10)] of the 90% particle size [D(90)] to the 10% particle size [D(10)] was 5.3. The results are shown in Table 2.

[0066] Furthermore, for the aqueous aerosol products for indoor pest control of Examples 2 to 8 and Comparative Examples 1 and 2, the 10% particle size [D(10)], 50% particle size [D(50)], and 90% particle size [D(90)] of the spray particles were measured in the same manner as for the aqueous aerosol product for indoor pest control of Example 1, and the ratio [D(90) / D(10)] of the 90% particle size [D(90)] to the 10% particle size [D(10)] was calculated. The results are shown in Table 2.

[0067] In Table 2, the values ​​for the 10% particle size [D(10)], 50% particle size [D(50)], and 90% particle size [D(90)] are values ​​obtained by rounding the measurement results to the first decimal place, and the values ​​for the ratio [D(90) / D(10)] are values ​​calculated using the measurement results for the 90% particle size [D(90)] and 10% particle size [D(10)] before rounding, and then rounding the calculation results to the first decimal place. Therefore, when the ratio [D(90) / D(10)] is calculated using the 90% particle size [D(90)] and 10% particle size [D(10)] values ​​shown in Table 2, a slight difference occurs from the value of the ratio [D(90) / D(10)] shown in Table 2, but such a slight difference is within the range of equivalence.

[0068] [Test Example 1] Control effect against cockroaches The control effects against cockroaches of the aqueous aerosol products for indoor pest control of Examples 1 to 8 and Comparative Examples 1 and 2 and the indoor pest control methods using these products were examined.

[0069] Three hollow triangular shelters (triangular shelters) were prepared by joining the long sides of three rectangular plywood boards (short side: 3 cm, long side: 15 cm, thickness: 0.5 cm) so that both ends were open. Five male and five female German cockroaches (a total of 10 cockroaches per shelter) were placed in each shelter. The openings on both ends were covered with gauze, and the shelters were given sugar water soaked in absorbent cotton from the outside. The shelters were then stored at 25±2°C for one day and night to acclimate the German cockroaches (Shelter A).

[0070] After habituation, the gauze on one end of each shelter A was removed, and three shelters A were combined with their sides touching to form a trapezoid (30 test insects, 15 males and 15 females). These shelters were placed in an acrylic container measuring 70 cm deep, 40 cm wide, and 18 cm high, with a 1 cm gap between the gauze surface of each shelter A and the back wall of the container. Three shelters A were combined in the same way as the three shelters A, except that no test insects were released. Three triangular shelters (shelter B) were formed, and the openings on one end of the three shelters B were placed in contact with the openings of the three shelters A in the acrylic container. In other words, the three shelters A and the three shelters B facing each other were placed in communication with each other.

[0071] Next, the aqueous aerosol product for indoor pest control of Example 1 was sprayed for 2 seconds toward the opening on the front side (near side, i.e., the side opposite to Shelter A) of each of the three Shelters B from a distance of 40 cm from the opening. The knockdown rate (%) of German cockroaches was calculated 20 minutes after the end of the spraying. All test insects were then transferred to clean plastic containers, given sugar water soaked in absorbent cotton, and stored at 25±2°C. The mortality rate (%) of German cockroaches was calculated by observing whether each was alive or dead 72 hours after the end of the spraying. The knockdown rate and mortality rate were both evaluated according to the following criteria. Similar tests were also conducted for Examples 2 to 8 and Comparative Examples 1 and 2. The results are shown in Table 2.

[0072] <Judgment criteria> A: 85% or more and 100% or less (excellent) B: 70% or more but less than 85% (good) C: Less than 70% (poor)

[0073] [Test Example 2] Obstacle adhesion test The aqueous aerosol products for indoor pest control of Examples 1 to 8 and Comparative Examples 1 and 2, and the indoor pest control methods using these products, were examined for their adhesion to obstacles.

[0074] Volume 25m 3 Room (area 10m 2Two chests of drawers, each measuring 1.0 m deep, 1.0 m wide, and 1.5 m high, were placed parallel to each other with a 5 cm gap between them. Test papers (ECGPAPER, manufactured by Kobayashi Record Paper Co., Ltd.) measuring 1.0 m wide and 1.5 m high were attached to the opposing sides of each chest of drawers. Next, the aqueous aerosol product for indoor pest control of Example 1 was sprayed diagonally downward for 2 seconds from a position 15 cm forward of the gap between the two chests (i.e., parallel to the opposing sides of the two chests) and at a height of 1.5 m. The total area (S) of the discolored portions of the two test papers due to the aerosol concentrate was measured. In a preliminary experiment, the color of the test papers used was observed in advance when the aerosol concentrate was dropped onto them. This color was used as the reference color. During the test, the portions of the test papers that became a color equivalent to the reference color upon spraying were determined to be discolored. The obtained area (S) was evaluated for obstacle adhesion (adhesion to obstacles) according to the following criteria. The same test was also carried out for Examples 2 to 8 and Comparative Examples 1 and 2. The results are shown in Table 2.

[0075] <Judgment criteria> A: Area (S) is 500 cm 2 Below (Excellent) B: Area (S) is 500 cm 2 Super 1000cm 2 Below (good) C: Area (S) is 1000 cm 2 Super (bad)

[0076] [Table 2]

[0077] As shown in Table 2, Examples 1 to 8, in which the 50% particle diameter [D(50)] of the spray particles at a position 30 cm away from the nozzle is set to 18 to 70 μm, were rated "A" or "B" (or higher) in terms of knockdown effect and lethal effect on pests (cockroaches) and adhesion to obstacles, demonstrating excellent effectiveness.

[0078] In addition to the above, in Examples 1 to 8, the 90% particle size [D(90)] of the spray particles is set to 38 to 200 μm, which can be said to more reliably provide excellent knockdown and lethal effects on pests (cockroaches) and excellent adhesion to obstacles. The 10% particle size [D(10)] of the spray particles is set to 9 to 30 μm, which can be said to more reliably provide excellent knockdown and lethal effects on pests (cockroaches) and excellent adhesion to obstacles. The ratio [D(90) / D(10)] of the 90% particle size [D(90)] to the 10% particle size [D(10)] of the spray particles is set to 9 or less, which can be said to more reliably provide excellent knockdown and lethal effects on pests (cockroaches) and excellent adhesion to obstacles.

[0079] A comparison of Examples 1 to 5, 7, and 8 with Example 6 revealed that Examples 1 to 5, 7, and 8, in which the ratio [D(90)] / D(10)] of the 90% particle diameter [D(90)] to the 10% particle diameter [D(10)] of the spray particles was set to 8.0 or less, received an "A" rating in terms of knockdown effect against pests (cockroaches), lethal effect, and obstacle adhesion, demonstrating superior effectiveness compared to Example 6, in which this ratio was set to greater than 8.0. Setting the 50% particle diameter [D(50)] of the spray particles to 18 to 50 μm, or even 18 to 40 μm, can be said to enhance lethal effect and obstacle adhesion. Setting the 90% particle diameter [D(90)] of the spray particles to 38 to 100 μm can be said to enhance lethal effect and obstacle adhesion. By setting the 10% particle size [D(10)] of the spray particles to 9 to 20 μm, it can be said that the lethal effect and adhesion to obstacles can be improved.

[0080] On the other hand, Comparative Example 1, in which the 50% particle diameter [D(50)] of the spray particles is set to be less than 18 μm, received a "C" rating for both the knockdown effect and the lethal effect on pests (cockroaches), indicating that these were insufficient. Also, Comparative Example 2, in which the 50% particle diameter [D(50)] of the spray particles is set to be more than 70 μm, received a "C" rating for both the lethal effect on pests (cockroaches) and the adhesion to obstacles, indicating that these were insufficient. [Industrial Applicability]

[0081] The aqueous aerosol product for indoor pest control, the indoor pest control method, and the method for using the aqueous aerosol product for indoor pest control of the present invention can be used to control pests that live indoors, and are particularly suitable for controlling cockroaches among other pests.

Claims

1. An aqueous aerosol product for indoor pest control for controlling pests indoors, a pressure-resistant container filled with an aerosol composition containing an aerosol concentrate (L) containing (a) an insecticidal component, (b) a hydrocarbon solvent, (c) a surfactant, and (d) water, and a propellant (G); a spray nozzle attached to the pressure-resistant container and having a nozzle for spraying the aerosol composition as spray particles; Equipped with The amount of the insecticidal component (a) in the aerosol concentrate (L) is 0.1 to 1 w / v %, An aqueous aerosol product for indoor pest control, wherein the 50% particle diameter [D(50)] of the spray particles is set to be 18 to 70 μm at a position 30 cm away from the nozzle.

2. 2. The aqueous aerosol product for controlling indoor pests according to claim 1, wherein the amount of the surfactant (c) in the aerosol concentrate (L) is 5 to 25 w / v %.

3. An aqueous aerosol product for indoor pest control as described in Claim 1, wherein the amount of (b) hydrocarbon solvent in the aerosol concentrate (L) is 30 to 60 w / v%.

4. 2. The aqueous aerosol product for controlling indoor pests according to claim 1, wherein the amount of water (d) in the aerosol concentrate (L) is 3 to 90 w / v %.

5. The aqueous aerosol product for indoor pest control according to any one of claims 1 to 4, wherein the 50% particle diameter [D(50)] of the spray particles is set to be 18 to 50 μm.

6. 5. The aqueous aerosol product for indoor pest control according to any one of claims 1 to 4, wherein the ratio [D(90) / D(10)] of the 90% particle diameter [D(90)] of the spray particles to the 10% particle diameter [D(10)] of the spray particles is set to be 8.0 or less at a position 30 cm away from the nozzle.

7. 7. The aqueous aerosol product for indoor pest control according to claim 6, wherein the 90% particle diameter [D(90)] of the spray particles is set to be 38 to 100 μm.

8. The aqueous aerosol product for indoor pest control according to claim 6, wherein the 10% particle diameter [D(10)] of the spray particles is set to be 9 to 20 μm.

9. The aqueous aerosol product for indoor pest control according to any one of claims 1 to 4, wherein the volume ratio (L / G) of the aerosol concentrate (L) to the propellant (G) is 15 / 85 to 70 / 30.

10. The contents of (b) hydrocarbon solvent, (c) surfactant, and (d) water blended in the aerosol concentrate (L) have the following magnitude relationship: (b) Hydrocarbon solvents > (d) Water > (c) Surfactants The aqueous aerosol product for indoor pest control according to any one of claims 1 to 4, which is set to satisfy the following:

11. The aqueous aerosol product for controlling indoor pests according to any one of claims 1 to 4, wherein the pest is a cockroach.

12. An indoor pest control method using an aqueous aerosol product for indoor pest control according to any one of claims 1 to 4, which comprises spraying the aerosol composition indoors as spray particles.

13. A method for using the aqueous aerosol product for indoor pest control according to any one of claims 1 to 4, comprising: A method of using the aqueous aerosol product for indoor pest control, which comprises spraying the spray particles in an indoor space where an obstacle is present on the floor so that the spray particles adhere preferentially to the floor rather than to the obstacle.

14. The method for use according to claim 13, wherein the aqueous aerosol product for indoor pest control is sprayed toward the space formed by the obstacle.

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