Water-based aerosol products for indoor pest control

Abstract

We provide a water-based aerosol product suitable for controlling pests indoors. [Solution] An aqueous aerosol product for indoor pest control, comprising: a pressure-resistant container filled with an aerosol composition comprising an aerosol concentrate (L) containing (a) an insecticidal component, (b) a hydrocarbon solvent, (c) a surfactant, and (d) water, and a propellant (G); and a spray nozzle attached to the pressure-resistant container and having a nozzle for spraying the aerosol composition as spray particles, wherein the 50% particle size [D(50)] of the spray particles is set to be 18 to 70 μm at a position 30 cm away from the nozzle.

Description

Technical Field

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

Background Art

[0002] Conventionally, from the viewpoints of reducing the risk of fire and considering environmental problems, a pest control method using an aqueous aerosol product obtained by blending water in an aerosol stock solution has been proposed.

[0003] For example, in consideration of the difference in the design of aerosol products between indoor and outdoor use, an aerosol product composed of an insecticidal component, a solvent, a solubilizing agent, water, and a propellant is sprayed at a spray rate of 1.5 mL / second and an average particle diameter of spray particles at an injection distance of 1 to 3 m is 20 to 100 μm. An outdoor mosquito control method has been proposed (see Patent Document 1). According to this control method, in the control of mosquitoes outdoors, it is said that the insecticidal component can reach the gaps in the foliage or shadows of plants without being affected by the wind.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] However, as shown in the above Patent Document 1, conventionally, the design concept of aerosol products is different between indoor and outdoor use, and it is hard to say that the above outdoor aerosol product is suitable for indoor aerosol products that are greatly affected by obstacles to pest control.

[0006] In order to control pests such as cockroaches indoors, it is effective to attach spray particles to surfaces such as floors where the pests rest or roam. However, indoors, although the space to be controlled is smaller than outdoors, there are relatively large obstacles relative to the size of the space, such as tables, chairs, furniture, and ornamental plants. Therefore, indoor pest control is more difficult than outdoor pest control because the presence of obstacles greatly hinders the diffusion of spray particles, making it difficult to attach the spray particles over a wide area to surfaces such as floors, which may reduce the effectiveness of the spray. For this reason, in indoor pest control, it is necessary to prevent the spray particles from attaching to obstacles. On the other hand, it is necessary to ensure that the spray particles adhere sufficiently to surfaces such as floors.

[0007] This invention has been made in view of the above circumstances, and aims to provide an aqueous aerosol product for indoor pest control suitable for controlling pests indoors, a method for controlling indoor pests 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, which solves the above problems, is as follows: A water-based aerosol product for indoor pest control, for controlling pests indoors, A pressure-resistant container filled with an aerosol composition comprising (a) an insecticide component, (b) a hydrocarbon solvent, (c) a surfactant, and (d) water, and a propellant (G), A spray nozzle attached to the pressure vessel and having a nozzle for spraying the aerosol composition as atomized particles, Equipped with, The setting is such that the 50% particle size [D(50)] of the sprayed particles at a position 30 cm away from the nozzle is 18 to 70 μm.

[0009] According to this water-based aerosol product for indoor pest control, (a) the spray particles containing the insecticidal component are less likely to adhere to obstacles indoors, while they adhere easily to surfaces such as floors. Specifically, by setting the 50% particle size [D(50)] of the spray particles to be 18 μm or larger, it is possible to prevent the spray particles from becoming too fine and difficult to fall, thus allowing a sufficient amount of spray particles to adhere to surfaces such as indoor floors where pests may rest or wander. Furthermore, by setting the 50% particle size [D(50)] of the spray particles to be 70 μm or smaller, it is possible to suppress the adhesion of spray particles to obstacles, thereby allowing the spray particles to reach and adhere to the aforementioned surfaces over a wider area. As a result, the amount and range of adhesion of spray particles to surfaces can be increased, thereby enhancing the pest control effect. Therefore, this water-based aerosol product for indoor pest control is suitable for pest control indoors.

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

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

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

[0013] With this configuration of an aqueous aerosol product for indoor pest control, the ratio of relatively fine spray particles to relatively coarse spray particles in the total spray particles is appropriate. As a result, (a) the spray particles containing the insecticidal component are less likely to adhere to obstacles indoors, while being more likely to adhere to surfaces such as floors, thus the aqueous aerosol product for indoor pest control has an enhanced effect in controlling pests indoors.

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

[0015] With this configuration of an aqueous aerosol product for indoor pest control, the proportion of relatively coarse spray particles in the total spray particles is appropriate. As a result, (a) the spray particles containing the insecticidal component are less likely to adhere to obstacles indoors, while being more likely to adhere to surfaces such as floors, thus enhancing the pest control effect of this aqueous aerosol product for indoor pest control indoors.

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

[0017] With this configuration of an aqueous aerosol product for indoor pest control, the proportion of relatively fine spray particles in the total spray particles is appropriate. As a result, (a) the spray particles containing the insecticidal component are less likely to adhere to obstacles indoors, while being more likely to adhere to surfaces such as floors, thus the aqueous aerosol product for indoor pest control has an enhanced effect in controlling pests indoors.

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

[0019] According to the aqueous aerosol product for controlling indoor pests of this configuration, the particle diameter of the spray particles is adjusted to a more appropriate range. As a result, indoors, (a) it is possible to make the spray particles containing the insecticidal component less likely to adhere to obstacles and more likely to adhere to the adhesion target such as the floor. Therefore, the aqueous aerosol product for controlling indoor pests has an enhanced pest control effect indoors.

[0020] In the aqueous aerosol product for controlling indoor pests according to the present invention, The respective contents of (b) a hydrocarbon solvent, (c) a surfactant, and (d) water blended in the aerosol stock solution (L) have the following magnitude relationship: (b) Hydrocarbon solvent > (d) Water > (c) Surfactant It is preferably set to satisfy this.

[0021] According to the aqueous aerosol product for controlling indoor pests of this configuration, by setting the respective contents of (b) a hydrocarbon solvent, (c) a surfactant, and (d) water blended in the aerosol stock solution (L) to satisfy the magnitude relationship of (b) hydrocarbon solvent > (d) water > (c) surfactant, the effect of the present invention that the spray particles can reach and adhere to the adhesion target over a wide range while suppressing the adhesion of the spray particles to obstacles can be easily obtained.

[0022] In the aqueous aerosol product for controlling indoor pests according to the present invention, It is preferable that the pest is a cockroach.

[0023] Cockroaches have a habit of hiding in gaps in obstacles, such as on the floor. If the spray particles easily adhere to obstacles, the presence of these obstacles hinders the spray particles from reaching these gaps effectively, thus hindering their ability to control cockroaches. However, this water-based aerosol product for indoor pest control can suppress the adhesion of spray particles to obstacles indoors, allowing the spray particles to reach even the gaps where cockroaches hide. Therefore, the effectiveness of this water-based aerosol product for indoor pest control is particularly pronounced when the target pest is a cockroach.

[0024] The characteristic configuration of the indoor pest control method according to the present invention, which solves the above problems, is as follows: The method involves using the aforementioned aqueous aerosol product for indoor pest control to spray the aerosol composition as spray particles indoors.

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

[0026] The characteristic configuration of the method of use of the aqueous aerosol product for indoor pest control according to the present invention, which solves the above problems, is as follows: A pressure-resistant container filled with an aerosol composition comprising (a) an insecticide component, (b) a hydrocarbon solvent, (c) a surfactant, and (d) water, and a propellant (G), A spray nozzle attached to the pressure vessel and having a nozzle for spraying the aerosol composition as atomized particles, A method for using an indoor pest control water-based aerosol product equipped with the following: The objective is to spray the aqueous aerosol product for indoor pest control in an indoor space where obstacles are present on the floor, such that the sprayed particles preferentially adhere to the floor rather than the obstacles.

[0027] According to the method of use of this water-based aerosol product for indoor pest control, in indoor spaces where obstacles exist on the floor, the spray particles ejected from the water-based aerosol product for indoor pest control are sprayed in such a way that they preferentially adhere to the floor rather than the obstacles. Therefore, even if there are relatively large obstacles in the room relative to the size of the space, such as tables, chairs, furniture, and ornamental plants, pests such as cockroaches can be reliably brought into contact with the spray particles that adhere to the floor, thereby enhancing the pest control effect.

[0028] In the method of using the aqueous aerosol product for indoor pest control according to the present invention, It is preferable to spray the aforementioned aqueous aerosol product for indoor pest control into the space formed by the obstacle.

[0029] According to the method of use for this water-based aerosol product for indoor pest control, it is possible to more reliably control cockroaches and other pests lurking in spaces (including gaps) formed between obstacles or between obstacles and walls, in addition to directly spraying the water-based aerosol product for indoor pest control onto the target pests. [Modes for carrying out the invention]

[0030] The following describes embodiments of the present invention concerning the aqueous aerosol product for indoor pest control, the method for indoor pest control using the same, and the method for using the aqueous aerosol product for indoor pest control. However, the present invention is not intended to be limited to the configurations described in the embodiments below. In this specification, when there is a notation "~" indicating a numerical range, it means that the numerical values ​​enclosing the "~" are included as the upper and lower limits, and the numerical range may also be formed by appropriately combining the upper and lower limits. In this specification, the unit of content "w / v%" is synonymous with "g / 100mL". In addition, "spraying indoors" includes not only spraying the aqueous aerosol product for indoor pest control indoors when it is placed indoors, but also spraying the aqueous aerosol product for indoor pest control indoors from outdoors when it 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 for controlling pests indoors. This aqueous aerosol product for indoor pest control is made by filling a pressure-resistant container with an aerosol composition containing an aerosol concentrate (L) containing (a) an insecticide 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 from the nozzle opening as spray particles. As the pressure-resistant container (aerosol container), an aerosol can equipped with a spray valve (aerosol valve) can be used. As the spray nozzle, one provided on an actuator (spray member) that functions as an operating part for spraying the aerosol composition can be used, and it may be a spray nozzle with a switchable nozzle length or a normal spray nozzle with a constant nozzle length. The actuator is attached to the spray valve.

[0032] <(a) Insecticide ingredients> (a) The insecticidal components are not particularly limited, but include pyrethroid insecticidal components such as phenothrin, permethrin, cyphenothrin, cypermethrin, cyfluthrin, resmethrin, phthalthrin, monfluorothrin, allethrin, prallethrin, flamethrin, imiprothrin, transfluthrin, metofluthrin, profluthrin, fenpropatrin, etofenprox, pyrethrin I, pyrethrin II, synerin I, synerin II, jasmolin I, jasmolin II, and natural pyrethrins (a mixture of pyrethrin I, pyrethrin II, synerin I, synerin II, jasmolin I, and jasmolin II), silicon-based insecticidal components such as silafluofen, and organophosphate insecticidal components. Among these, pyrethroid insecticidal components and / or silicon-based insecticidal components are preferred in terms of efficacy and safety. If the above compound contains an asymmetric carbon or a double bond in its chemical structure, and optical isomers or geometric isomers based on this, then each of these isomers or any mixture thereof is also included in (a) the insecticidal component. (a) The insecticidal component can be used alone, but it can also be used as a mixture of two or more.

[0033] The amount of (a) insecticide component 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%. Alternatively, the amount of (a) insecticide component 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 0.1 to 1 w / v%. By ensuring the amount of (a) insecticide component in the aerosol concentrate (L) is within the above range, the amount of (a) insecticide component contained in the aerosol concentrate (L) and, consequently, in the spray particles, can be made more appropriate, thus enhancing the control effect of this water-based aerosol product for indoor pest control against pests such as cockroaches indoors.

[0034] (b) Hydrocarbon solvents (b) The hydrocarbon solvent is not particularly limited, but examples include aliphatic hydrocarbon solvents such as paraffinic hydrocarbons and naphthenic hydrocarbons. Among these, normal paraffin, isoparaffin, and liquid paraffin are preferred, and normal paraffin is more preferred. The number of carbon atoms in the hydrocarbon solvent is preferably 8 to 20, and 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, and commercially available products such as neothiozol (manufactured by Chuo Kasei Co., Ltd.) containing these components can also be used. Furthermore, examples of isoparaffins as described above include isooctane, isononane, isodecane, isoundecane, isododecane, isotridecane, isotetradecane, isopentadecane, isohexadecane, etc. Commercial products containing these components, such as Isopar M (manufactured by ExxonMobil), Isopar H (manufactured by ExxonMobil), Isopar L (manufactured by ExxonMobil), and IP Clean LX (manufactured by Idemitsu Kosan Co., Ltd.), can also be used. As for liquid paraffins as described above, commercial products such as liquid paraffin 40S can be used. (b) When the aerosol composition forms an aqueous emulsion, the hydrocarbon solvent becomes the oily component. (b) A single hydrocarbon solvent can be used, but a mixture of two or more can also be used.

[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%. By having the amount of (b) hydrocarbon solvent in the aerosol concentrate (L) within the above range, the amount of (b) hydrocarbon solvent in the aerosol concentrate (L) and, consequently, in the aerosol composition becomes more appropriate, making it more difficult for spray particles containing (a) insecticidal components to adhere to obstacles indoors, while making it easier for them to adhere to surfaces such as floors. As a result, the water-based aerosol product for indoor pest control has an enhanced effect in controlling pests indoors.

[0036] <(c) Surfactants> (c) The surfactant is not particularly limited, but examples include nonionic surfactants, anionic surfactants, cationic surfactants, and amphoteric surfactants, and among these, 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 alkyl ethers such as 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. (c) When the aerosol composition forms an aqueous emulsion, the surfactant functions as an emulsifier. (c) Surfactants can be used individually, but they can also be used as a mixture of two or more types.

[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%. Alternatively, the amount of surfactant (c) in the aerosol concentrate (L) may be 7 to 15 w / v%, or 9 to 15 w / v%. By having the amount of surfactant (c) in the aerosol concentrate (L) within the above range, the amount of surfactant (c) in the aerosol concentrate (L), and consequently in the aerosol composition, becomes more appropriate. This makes it more difficult for spray particles containing the insecticidal component (a) to adhere to obstacles indoors, while making them easier to adhere to surfaces such as floors. Therefore, the water-based aerosol product for indoor pest control has an enhanced effect in controlling pests indoors.

[0038] <(d)Water> (d) The water is not particularly limited, and for example, tap water, distilled water, purified water, deep-sea water, etc. can be used. (d) Water can be used alone, or as a mixture of two or more types. (d) If the aerosol composition forms an aqueous emulsion, water becomes the aqueous component.

[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%. Alternatively, 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 40 to 50 w / v%. By having the amount of (d) water in the aerosol concentrate (L) within the above range, the amount of (d) water in the aerosol concentrate (L), and consequently the aerosol composition, becomes more appropriate. This makes it more difficult for the spray particles containing (a) insecticidal components to adhere to obstacles indoors, while making them easier to adhere to surfaces such as floors. As a result, the water-based aerosol product for indoor pest control has an enhanced effect in controlling pests indoors.

[0040] The relative amounts of (b) hydrocarbon solvent, (c) surfactant, and (d) water contained in the aerosol concentrate (L) are as follows: (b) hydrocarbon solvents > (d) water > (c) surfactants It is preferable to set the parameters to satisfy this condition. By setting the content of each component blended in the aerosol concentrate (L) in such a relative order, the effects of the present invention, which allow spray particles to reach and adhere to a wide area of ​​the target object while suppressing the adhesion of spray particles to obstacles, can be easily obtained.

[0041] <Other components in the aerosol concentrate (L)> In addition to the components (a) to (d) above, the aerosol concentrate (L) may appropriately contain acaricides, fungicides targeting molds, fungi, etc., antibacterial agents, and fungicides. Examples of acaricides include 5-chloro-2-trifluoromethanesulfonamide methyl benzoate, phenyl salicylate, and 3-iodo-2-propynyl butylcarbamate. Examples of fungicides, antibacterial agents, or fungicides include 2-mercaptobenzothiazole, 2-(4-thiazolyl)bentimidazole, triforine, 3-methyl-4-isopropylphenol, and ortho-phenylphenol. Furthermore, the aerosol concentrate (L) may appropriately contain synergists, stabilizers, fragrances, excipients, etc.

[0042] <Propellant (G)> Examples of propellants (G) include liquefied petroleum gas (LPG) such as propane, n-butane, and isobutane; liquefied gases other than liquefied petroleum gas, such as n-pentane, isopentane, dimethyl ether (DME), and hydrofluoroolefins such as HFO1234ze; and compressed gases such as nitrogen gas, carbon dioxide, nitrous oxide, and compressed air. For ease of use, LPG-based propellants (G) are preferred. Propellant (G) can be used individually or as a mixture of two or more. The propellant (G) is preferably used with a gauge pressure (at 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 this range, the particle size of the sprayed particles is adjusted to a more appropriate range. As a result, (a) the spray particles containing the insecticidal component are less likely to adhere to obstacles indoors, while being more likely to adhere to surfaces such as floors, thus the water-based aerosol product for indoor pest control has an enhanced effect 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. By having the volume ratio (L / G) 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 sprayed particles is adjusted to a more appropriate range. As a result, indoors, (a) the sprayed particles containing the insecticidal component are less likely to adhere to obstacles, while being more likely to adhere to surfaces such as floors, thus the indoor pest control effect of the aqueous aerosol product is enhanced.

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

[0045] <Characteristics of water-based aerosol products for indoor pest control> In this water-based aerosol product for indoor pest control, the 50% particle size [D(50)] of the sprayed particles is set to be 18-70 μm at a distance of 30 cm from the nozzle. The 50% particle size [D(50)] of the sprayed particles is preferably 18-50 μm, and more preferably 18-40 μm. By setting the 50% particle size [D(50)] of the sprayed particles to be within the above range, (a) sprayed particles containing the insecticidal component are less likely to adhere to obstacles indoors, while they are more likely to adhere to surfaces such as floors. In other words, the sprayed particles will preferentially adhere to the floor rather than obstacles. Specifically, by setting the 50% particle size [D(50)] of the sprayed particles to be 18 μm or larger, it is possible to suppress the sprayed particles from becoming too fine and difficult to fall, thus allowing a sufficient amount of sprayed particles to adhere to surfaces such as indoor floors where pests may rest or wander. Furthermore, by setting the 50% particle diameter [D(50)] of the sprayed particles to be 70 μm or less, the adhesion of sprayed particles to obstacles can be suppressed, thereby allowing the sprayed particles to reach and adhere to the target objects over a wider area.

[0046] Furthermore, the reason (mechanism) why the adhesion of spray particles to obstacles can be suppressed when the 50% particle diameter [D(50)] of the sprayed particles is below a predetermined size (70 μm or less in this invention) is not yet fully understood, but one hypothesis is as follows.

[0047] Since the aerosol product of the present invention is an aqueous aerosol product, its spray particles exhibit different behavior 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 at the same time, (c) surfactant in particular is thought to affect the surfactant activity of the surface of the generated spray particles. The interfacial action of (c) surfactant generally acts in a direction that promotes adhesion to the surface. However, contrary to expectations, in the aqueous aerosol product for indoor pest control of the present invention, spray particles with a 50% particle diameter [D(50)] of 70 μm or less exhibit a unique property of being less likely to adhere to obstacles due to surfactant action with obstacle surfaces, compared to larger spray particles with a 50% particle diameter [D(50)] exceeding 70 μm, due to the movement speed caused by spraying. Furthermore, these unique properties (phenomena) are more pronounced when the spray particles flow along the surface of the gaps in the obstacle than when they are sprayed perpendicular to the obstacle.

[0048] Thus, with the water-based aerosol product for indoor pest control of the present invention, by setting the 50% particle size [D(50)] of the sprayed particles at a distance of 30 cm from the nozzle within an appropriate range, the amount and range of adhesion of sprayed particles to the target object can be increased, thereby enhancing the pest control effect. Therefore, this water-based aerosol product for indoor pest control is suitable for pest control indoors. Furthermore, by suppressing adhesion to obstacles, the possibility of contamination and staining of obstacles, and discoloration of furniture can also be suppressed.

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

[0050] In the aqueous aerosol product for indoor pest control, it is preferable that the ratio of the 90% particle size [D(90)] to the 10% particle size [D(10)] of the sprayed particles [D(90) / D(10)] at a distance of 30 cm from the nozzle is 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]. Furthermore, the ratio [D(90) / D(10)] may be between 3.5 and 5.0 [3.5 ≤ D(90) / D(10) ≤ 5.0]. By setting the ratio [D(90) / D(10)] to fall within the above range, the ratio of relatively fine spray particles to relatively coarse spray particles in the total spray particles becomes appropriate. As a result, (a) spray particles containing insecticidal components are less likely to adhere to obstacles indoors, while being more likely to adhere to surfaces such as floors, thus enhancing the pest control effect of the water-based aerosol product for indoor pest control indoors.

[0051] In the aqueous aerosol product for indoor pest control of this embodiment, it is preferable that the 90% particle size [D(90)] of the sprayed particles at a distance of 30 cm from the nozzle is set to 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. By setting the 90% particle size [D(90)] of the sprayed particles to fall within the above range, the proportion of relatively coarse sprayed particles in the total sprayed particles becomes appropriate. As a result, (a) sprayed particles containing insecticidal components are less likely to adhere to obstacles indoors, while being more likely to adhere to surfaces such as floors, thus the aqueous aerosol product for indoor pest control has an enhanced effect in controlling pests indoors.

[0052] In the aqueous aerosol product for indoor pest control of this embodiment, it is preferable that the 10% particle size [D(10)] of the sprayed particles at a distance of 30 cm from the nozzle is set to 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 sprayed particles to fall within the above range, the proportion of relatively fine sprayed particles in the total sprayed particles becomes appropriate. As a result, (a) sprayed particles containing insecticidal components are less likely to adhere to obstacles indoors, while being more likely to adhere to surfaces such as floors, thus the aqueous aerosol product for indoor pest control has an enhanced effect in controlling pests indoors.

[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 sprayed particles described above can be set to a desired range by appropriately setting (a) the type of insecticide component, (b) the hydrocarbon solvent, and (c) the surfactant, the amount of each component blended in the aerosol concentrate (L), the volume ratio (L / G) of the aerosol concentrate (L) to the propellant (G), and the spraying force.

[0054] As described above, with this water-based aerosol product for indoor pest control, the 50% particle size [D(50)] of the sprayed particles at a distance of 30 cm from the nozzle is set to be 18 to 70 μm. This means that indoors, (a) the sprayed particles containing the insecticidal component are less likely to adhere to obstacles, while they adhere easily to surfaces such as floors. This increases the amount and range of adhesion of the sprayed particles to surfaces, making this water-based 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 of spraying an aerosol composition as spray particles indoors using the above-described aqueous aerosol product for indoor pest control.

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

[0057] [Instructions for using water-based aerosol products for indoor pest control] The method of using the water-based aerosol product for indoor pest control according to this embodiment involves spraying the water-based aerosol product for indoor pest control in an indoor space where obstacles exist on the floor, such that the sprayed particles preferentially adhere to the floor rather than the obstacles.

[0058] According to the method of using the water-based aerosol product for indoor pest control of this embodiment, in addition to directly spraying the water-based aerosol product for indoor pest control onto the target pests, the product is sprayed in such a way that the spray particles preferentially adhere to the floor rather than the obstacles in an indoor space where obstacles exist on the floor. Therefore, even if there are relatively large obstacles in the room relative to the size of the space, such as tables, chairs, furniture, and ornamental plants, pests such as cockroaches can reliably come into contact with the spray particles that adhere to the floor, thereby enhancing the pest control effect. When implementing the method of using the water-based aerosol product for indoor pest control of this embodiment, it is preferable to spray the water-based aerosol product for indoor pest control into the space formed by the obstacles. By spraying an indoor pest control water-based aerosol product into spaces formed between obstacles (for example, the gap between two chests of drawers) or between an obstacle and a wall (for example, between a chest of drawers and a wall), it is possible to more reliably control cockroaches and other pests lurking in those spaces, just as if the product were sprayed directly at the target pest.

[0059] [Applicable space] The space to which the aqueous aerosol product and indoor pest control method of this embodiment are applied is not particularly limited as long as it is an indoor space, and examples include closets, cupboards, wardrobes, cupboards, toilets, bathrooms, storage rooms, living rooms, dining rooms, warehouses, car interiors, furniture, and the spaces between pieces of furniture.

[0060] [Pests targeted for control] In this embodiment, examples of pests targeted for control include cockroaches such as the German cockroach, American cockroach, Japanese cockroach, and brown cockroach; creeping insects such as spiders, centipedes, ants, house centipedes, millipedes, pill bugs, sowbugs, termites, caterpillars, mites, lice, ticks, and bed bugs; and flying insects such as mosquitoes, flies, moths, bees, stink bugs, carpet beetles, cigarette beetles, woodworms, clothes moths, and clothes moths. Among these, it can be suitably used against creeping insects that are particularly problematic indoors, and even more suitably used against cockroaches. Cockroaches have a habit of hiding in gaps in obstacles, such as on the floor. If the spray particles tend to adhere to obstacles, the presence of these obstacles can hinder the spray particles from reaching these gaps effectively, thus hindering their ability to control cockroaches. However, this water-based aerosol product and method for controlling indoor pests can suppress the adhesion of spray particles to obstacles indoors, allowing the spray particles to reach even the gaps where cockroaches hide. Therefore, the effectiveness of this embodiment is particularly evident when the target pest is a cockroach. [Examples]

[0061] 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, (a) 0.6 g of imiprothrin and 0.6 g of phenothrin as insecticide components, (b) 100 g of a C11-C14 normal paraffin hydrocarbon (neothiozol: manufactured by Chuo Kasei Co., Ltd.) as a hydrocarbon solvent, (c) 24 g of surfactant A (mainly composed of polyethylene glycol monooleate (polyethylene glycol oleate)) as a surfactant, and (d) water as the remainder were mixed to prepare 200 mL of aerosol stock (L). 60 mL of this aerosol stock (L) and 140 mL of liquefied petroleum gas (LPG) [0.34 MPa (20℃)] as a propellant (G) were pressurized and filled into an aerosol container (pressure-resistant container) equipped with an aerosol valve, so that the volume ratio (L / G) of aerosol stock (L) to propellant (G) was 30 / 70. Then, by attaching an actuator equipped with a spray nozzle to the aerosol valve, the aqueous aerosol product for indoor pest control of Example 1 was obtained.

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

[0064] [Table 1]

[0065] [Measurement of particle size of sprayed particles 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 sprayed particles were measured at a distance of 30 cm from the nozzle of the aqueous aerosol product for indoor pest control, according to the measurement method described above. In addition, the ratio [D(90) / D(10)] between the 90% particle size [D(90)] and the 10% particle size [D(10)] was calculated. As a result, the 50% particle size [D(50)] of the sprayed 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)] between the 90% particle size [D(90)] and 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 in Examples 2-8 and Comparative Examples 1-2, the 10% particle size [D(10)], 50% particle size [D(50)], and 90% particle size [D(90)] of the sprayed particles were measured, similar to the aqueous aerosol product for indoor pest control in 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 10% particle size [D(10)], 50% particle size [D(50)], and 90% particle size [D(90)] are the measurement results rounded to the first decimal place. The ratio [D(90) / D(10)] is calculated using the measurement results for 90% particle size [D(90)] and 10% particle size [D(10)] before rounding, and the calculated result is rounded to the second decimal place. Therefore, when calculating the ratio [D(90) / D(10)] using the values ​​for 90% particle size [D(90)] and 10% particle size [D(10)] shown in Table 2, there is a slight difference compared to the ratio [D(90) / D(10)] shown in Table 2, but such a slight difference falls within the range of equality.

[0068] [Test Example 1] Control effect against cockroaches The effectiveness of the aqueous aerosol products for indoor pest control described in Examples 1-8 and Comparative Examples 1-2, and the indoor pest control methods using these products, against cockroaches was investigated.

[0069] Three triangular prism-shaped hollow 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 were placed in each triangular shelter (a total of 10 cockroaches in each shelter), the openings at both ends were covered with gauze, and sugar water soaked in cotton wool was supplied from the outside. The shelters were then preserved for 24 hours at a temperature of 25±2°C to allow the German cockroaches to acclimate (shelter A).

[0070] After acclimatization, the gauze on one end of each shelter A was removed, and the three shelters A were combined so that their sides were in contact to form a trapezoid (15 males and 15 females of German cockroaches, i.e., a total of 30 cockroaches were used as test insects). These were then 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. In addition, three triangular shelters (shelters B) were formed by combining the three shelters A in the same way as the three shelters A, except that no test insects were released into them. The openings on one end of each of the three shelters B were placed in contact with the openings of the three shelters A inside the acrylic container. In other words, the three shelters A and the three shelters B facing each shelter A were each connected to each other.

[0071] Next, the aqueous aerosol product for indoor pest control from Example 1 was sprayed for 2 seconds from a distance of 40 cm from the opening on the front side (the side opposite to shelter A) of three shelters B. The knockdown rate (%) of the German cockroaches was then calculated 20 minutes after the end of spraying. Next, all test insects were transferred to a clean plastic container, given sugar water soaked in cotton wool, and stored at a temperature of 25±2℃. The mortality rate (%) of the German cockroaches was calculated by observing the survival status of each German cockroach 72 hours after the end of spraying. The obtained knockdown rate and mortality rate were both evaluated based on the following criteria. The same tests were performed for Examples 2-8 and Comparative Examples 1-2. The results are shown in Table 2.

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

[0073] [Test Example 2] Obstacle Adhesion Test The adhesion of spray particles to obstacles was investigated for the aqueous aerosol products for indoor pest control of Examples 1-8 and Comparative Examples 1-2, as well as the indoor pest control methods using these products.

[0074] Volume 25m 3 The room (area 10m²) 2Two chests of drawers, each measuring 1.0m deep x 1.0m wide x 1.5m high, were placed parallel to each other in the center of the room, with a 5cm gap between them. A 1.0m wide x 1.5m high test strip (ECGPAPER, manufactured by Kobayashi Recording Paper Co., Ltd.) was attached to each chest of drawers on opposite sides. Next, the aqueous aerosol product for indoor pest control of Example 1 was sprayed diagonally downwards for 2 seconds from a position 15cm away from the gap between the two chests of drawers (i.e., parallel to the opposite sides of the two chests) and at a height of 1.5m. The total area (S) of the discolored portion on the two test strips where the aerosol concentrate adhered was measured. In this preliminary experiment, the color of the test strip when the aerosol concentrate was dropped onto it was observed beforehand and used as the reference color. During the test, the portion of the test strip that became the same color as the reference color after spraying was judged to be the discolored portion. The adhesion to obstacles (adhesion to obstacles) was evaluated for the obtained area (S) according to the following criteria. The same tests were performed for Examples 2-8 and Comparative Examples 1-2. The results are shown in Table 2.

[0075] <Judgment criteria> A: Area (S) is 500cm 2 The following are (excellent): B: Area (S) is 500cm² 2 Super 1000cm 2 The following is (good): C: Area (S) is 1000 cm² 2 Extreme (bad)

[0076] [Table 2]

[0077] As shown in Table 2, Examples 1 to 8, in which the 50% particle size [D(50)] of the sprayed particles at a distance of 30 cm from the nozzle was set to 18 to 70 μm, all received an "A" or "B" rating ("B" or higher) for knockdown effect, lethal effect, and obstacle adhesion against pests (cockroaches), demonstrating excellent effectiveness.

[0078] In addition to the above, Examples 1 to 8 are set so that the 90% particle size [D(90)] of the sprayed particles is 38 to 200 μm, which can be said to result in a more reliable knockdown effect and lethal effect against pests (cockroaches), as well as superior adhesion to obstacles. The 10% particle size [D(10)] of the sprayed particles is set so that it is 9 to 30 μm, which can be said to result in a more reliable knockdown effect and lethal effect against pests (cockroaches), as well as superior 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 sprayed particles is set to 9 or less, which can be said to result in a more reliable knockdown effect and lethal effect against pests (cockroaches), as well as superior adhesion to obstacles.

[0079] A comparison of Examples 1-5, 7, and 8 with Example 6 shows that Examples 1-5, 7, and 8, where the ratio of the 90% particle size [D(90)] to the 10% particle size [D(10)] of the sprayed particles [D(90) / D(10)] is set to 8.0 or less, received an "A" rating for knockdown effect, lethal effect, and obstacle adhesion against pests (cockroaches) compared to Example 6, where this ratio is set to 8.0, demonstrating superior effectiveness. Setting the 50% particle size [D(50)] of the sprayed particles to 18-50 μm, and even 18-40 μm, can enhance the lethal effect and obstacle adhesion. Setting the 90% particle size [D(90)] of the sprayed particles to 38-100 μm can also enhance the lethal effect and obstacle adhesion. By setting the 10% particle size [D(10)] of the sprayed particles to be between 9 and 20 μm, it can be said that the lethal effect and adhesion to obstacles are enhanced.

[0080] On the other hand, Comparative Example 1, in which the 50% particle size [D(50)] of the sprayed particles was set to less than 18 μm, received a "C" rating for both the knockdown effect and the lethal effect against pests (cockroaches), indicating that these effects were insufficient. Furthermore, Comparative Example 2, in which the 50% particle size [D(50)] of the sprayed particles was set to more than 70 μm, received a "C" rating for both the lethal effect against pests (cockroaches) and the ability to adhere to obstacles, indicating that these effects were insufficient. [Industrial applicability]

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

Claims

1. A water-based aerosol product for indoor pest control, for controlling pests indoors, A pressure-resistant container filled with an aerosol composition comprising (a) an insecticide component, (b) a hydrocarbon solvent, (c) a surfactant, and (d) water, and a propellant (G), A spray nozzle attached to the pressure vessel and having a nozzle for spraying the aerosol composition as atomized particles, Equipped with, The amount of surfactant (c) in the aerosol concentrate (L) is 5 to 25 w / v%, An aqueous aerosol product for indoor pest control, wherein the 50% particle size [D(50)] of the sprayed particles is set to be 18 to 70 μm at a position 30 cm away from the nozzle.

2. A water-based aerosol product for indoor pest control, for controlling pests indoors, A pressure-resistant container filled with an aerosol composition comprising (a) an insecticide component, (b) a hydrocarbon solvent, (c) a surfactant, and (d) water, and a propellant (G), A spray nozzle attached to the pressure vessel and having a nozzle for spraying the aerosol composition as atomized particles, Equipped with, The amount of (b) hydrocarbon solvent in the aerosol concentrate (L) is 30 to 60 w / v%, An aqueous aerosol product for indoor pest control, wherein the 50% particle size [D(50)] of the sprayed particles is set to be 18 to 70 μm at a position 30 cm away from the nozzle.

3. A water-based aerosol product for indoor pest control, for controlling pests indoors, A pressure-resistant container filled with an aerosol composition comprising (a) an insecticide component, (b) a hydrocarbon solvent, (c) a surfactant, and (d) water, and a propellant (G), A spray nozzle attached to the pressure vessel and having a nozzle for spraying the aerosol composition as atomized particles, Equipped with, The amount of water (d) in the aerosol concentrate (L) is 3 to 90 w / v%, An aqueous aerosol product for indoor pest control, wherein the 50% particle size [D(50)] of the sprayed particles is set to be 18 to 70 μm at a position 30 cm away from the nozzle.

4. The aqueous aerosol product for indoor pest control according to any one of claims 1 to 3, wherein the 50% particle size [D(50)] of the sprayed particles is set to be 18 to 50 μm.

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