Composition and method for insect pest control

Abstract

Provided is a composition containing natural pyrethrin, a radical chain inhibitor, a peroxide decomposer, and a solvent. The ratio (V2 / V1) of the viscosity V2 (mPa・s) of the composition after storage at 90°C for 3 weeks to the viscosity V1 (mPa・s) of the initial composition is 1-5.

Description

Composition and pest control method

[0001] The present invention relates to a composition and a pest control method. This patent application claims the priority and benefits under the Paris Convention based on Japanese Patent Application No. 2024-230254 (filed on December 26, 2024), and by incorporating it herein, the entire content described in the above application is incorporated into this specification.

[0002] Due to the increasing natural orientation of consumers, natural pyrethrin has attracted attention (for example, Patent Document 1). Natural pyrethrin is suitably used for pest control, etc., but due to the instability of its chemical structure, the pest control effect may decrease over time or when exposed to high temperatures.

[0003] International Publication No. 2022 / 220294

[0004] An object of the present invention is to provide a composition and a pest control method having an excellent pest control effect.

[0005] As a result of investigations to find a composition having an excellent pest control effect, the present inventor found that a composition containing natural pyrethrin, a radical chain inhibitor, a peroxide decomposer, and a solvent, and the ratio (V2 / V1) of the viscosity V2 (mPa·s) after storage at 90°C for 3 weeks to the initial viscosity V1 (mPa·s) of the composition is 1 to 5 has an excellent pest control effect.

[0006] The present invention includes the following [1] to

[12] : [1] A composition comprising a natural pyrethrin, a radical chain inhibitor, a peroxide decomposer, and a solvent, wherein the ratio (V2 / V1) of the viscosity V2 (mPa·s) after storage at 90°C for 3 weeks to the viscosity V1 (mPa·s) of the initial composition is 1 to 5 (hereinafter sometimes referred to as the present invention composition). [2] The composition according to [1], wherein the viscosity V1 of the initial composition is in the range of 2 to 40 mPa·s. [3] The composition according to [1] or [2], wherein the content of the natural pyrethrin is in the range of 10 to 75% by mass. [4] The composition according to any one of [1] to [3], wherein the radical chain inhibitor comprises at least one selected from the group consisting of dibutylhydroxytoluene and butylhydroxyanisole. [5] The composition according to any one of [1] to [4], wherein the peroxide decomposing agent comprises at least one selected from the group consisting of triphenyl phosphite, tetraphenyldipropylene glycol diphosphite, diphenyl mono(2-ethylhexyl) phosphite, di-n-decylphenyl phosphite, 4,4'-butylidenebis(3-methyl-6-t-butylphenyl ditridecyl phosphite), 2-tert-butyl-6-methyl-4-{3-[(2,4,8,10-tetra-tert-butyldibenzo[d,f][1,3,2]dioxaphosphine-6-yl)oxy]propyl}phenol, tetra(C12-15 alkyl)-4,4'-isopropylidenediphenyl diphosphite, and triisodecyl phosphite. [6] The composition according to any one of [1] to [4], wherein the peroxide decomposing agent comprises at least one selected from the group consisting of triphenyl phosphite and 4,4'-butylidenebis(3-methyl-6-t-butylphenyl ditridecyl phosphite). [7] The composition according to any one of [1] to [6], wherein the mass ratio of the radical chain inhibitor to the peroxide decomposing agent is 1:0.017 to 1:7.5. [8] A heat vaporization insecticide comprising the composition according to any one of [1] to [7] and a solvent for dilution. [9] A heat vaporization insecticide device comprising a liquid bottle filled with the heat vaporization insecticide according to [8], a liquid absorption wick, and a heating element.A method for controlling pests, comprising the step of vaporizing natural pyrethrin into the air using a heat vaporization type insecticide device described in

[10] and [9]. A pest control mat comprising the composition described in any of [1] to [7] and a solid carrier. A method for controlling pests, comprising the step of heating the pest control mat described in

[11] to vaporize natural pyrethrin into the air.

[0007] The composition and pest control method of the present invention have excellent pest control effects.

[0008] Figure 1 is a cross-sectional view of a heat vaporization type insecticide device using a liquid insecticide bottle. Figure 2 is a perspective view of a heat vaporization type insecticide device using an insect control mat.

[0009] The composition of the present invention comprises natural pyrethrin, a radical chain inhibitor, a peroxide decomposer, and a solvent.

[0010] <Natural Pyrethrins> The natural pyrethrins used in this invention contain six compounds as active ingredients: pyrethrin I, pyrethrin II, cinerin I, cinerin II, jasmoline I, and jasmoline II. Natural pyrethrins can typically be obtained as an extract or dried pyrethrin powder, obtained by extracting the active ingredients from a powder made by collecting, drying, and grinding only the calyx of the flower of chrysanthemum (Tanacetum cinerariifolium or Chrysanthemum cinerariaefolium) using a suitable solvent (also called a solvent), such as an organic solvent like methanol. In addition to the six compounds mentioned above, natural pyrethrins may also contain plant-derived impurities (such as fatty acids and flavonoids).In addition to the aforementioned Chrysanthemum cinerariaefolium, other plants from which natural pyrethrins can be obtained include Calendula officinalis, Chrysanthemum coccinum, Tagetes erecta, Tagetes minuta, Zinnia elegans, and Zinnia linnearis (References 1: Adnane. H. Alain, C. & Chantal, B. 2000. The Production of Pyrethrins by Plant Cell and Tissue Cultures of Chrysanthemum cinerariaefolium and Tagetes Species. Critical Reviews in Plant Sciences, 19(1):69-89; Reference 2: Kudakasseril, GJ and Staba, EJ 1988. Insecticidal phytochemicals. In: Cell Culture and Somatic Cell Genetics of Plants. pp. 537-552. Constabel, F. and Vasil, IK, Eds., Academic Press, New York, Reference 3: John E. Casida, Gary B. Quistad. 1995. PYRETHRUM FLOWERS, Production, Chemistry, Toxicology, and Uses. pp. 123-125, Oxford University Press.).

[0011] The plant species and varieties that serve as the source of natural pyrethrins used in this invention are not limited to those mentioned above. The cultivation methods, cultivation conditions (weather, origin, soil type, etc.), harvest time, harvest part, harvesting method, washing method, extraction method, and purification method of the plants are not particularly limited. Natural pyrethrins used in this invention also include, for example, natural pyrethrins obtained using a vector into which a gene encoding a pyrethrin biosynthesis enzyme is incorporated.

[0012] The mass ratios of the six compounds used in the natural pyrethrins of the present invention—pyrethrin I, pyrethrin II, synerin I, synerin II, jasmolin I, and jasmolin II—are not particularly limited. Any mass ratio can be set for each compound in the range of 0.001 to 99% by mass relative to the total amount of natural pyrethrins. Typically, however, the natural pyrethrins are contained in the following mass ratios: pyrethrin I at 10 to 70% by mass, pyrethrin II at 10 to 70% by mass, synerin I at 1 to 20% by mass, synerin II at 1 to 20% by mass, jasmolin I at 1 to 20% by mass, and jasmolin II at 1 to 20% by mass, relative to the total amount of natural pyrethrins. As a specific example of a mixing ratio (mass ratio), [Pyrethrin I: Synerin I: Jasmolin I: Pyrethrin II: Synerin II: Jasmolin II] = 38.0:7.3:4.0:35.0:11.7:4.0 (Reference 3).

[0013] Examples of natural pyrethrins used in the present invention include pyrethrin I (total amount of pyrethrin I, synerin I, and jasmolin I) and pyrethrin II (total amount of pyrethrin II, synerin II, and jasmolin II), with pyrethrin I at 20 to 40% by mass and pyrethrin II at 12 to 31% by mass relative to the total amount of natural pyrethrin. The total amount of pyrethrin I and pyrethrin II in the natural pyrethrin is usually 10 to 99% by mass, preferably 15 to 90% by mass, and more preferably 20 to 85% by mass, relative to the total amount of natural pyrethrin.

[0014] In one embodiment of the present invention, the content of natural pyrethrins in the composition (as the total amount of pyrethrin I, synerin I, jasmolin I, pyrethrin II, synerin II, and jasmolin II) is preferably 10 to 75% by mass, more preferably 20 to 55% by mass, and even more preferably 30 to 50% by mass, based on the total amount of the composition. Specific examples of natural pyrethrin content include 10% by mass, 15% by mass, 20% by mass, 25% by mass, 30% by mass, 35% by mass, 40% by mass, 45% by mass, 50% by mass, 55% by mass, 60% by mass, 65% by mass, 70% by mass, and 75% by mass. These content can also be expressed as "approximately." "Approximately" means plus or minus 10%, for example, "approximately 10% by mass" means 9% to 11% by mass.

[0015] <Radical Chain Inhibitors> The radical chain inhibitors used in the present invention will now be described. In the present invention, a radical chain inhibitor means a compound that has the effect of stopping a chain reaction caused by free radicals by reacting with free radicals to produce stable molecules. Examples of radical chain inhibitors include dibutylhydroxytoluene (hereinafter sometimes abbreviated as BHT) and butylhydroxyanisole (hereinafter sometimes abbreviated as BHA). BHT and BHA may be used in combination as radical chain inhibitors. BHT and BHA are commercially available, for example, from Kanto Chemical Co., Ltd. In one embodiment of the present invention, the content of the radical chain inhibitor in the composition is preferably 4 to 60% by mass, more preferably 5 to 55% by mass, and even more preferably 7 to 50% by mass, based on the total amount of the composition. Specific radical chain inhibitor contentes include 4% by mass, 5% by mass, 6% by mass, 7% by mass, 8% by mass, 9% by mass, 10% by mass, 11% by mass, 12% by mass, 13% by mass, 14% by mass, 15% by mass, 16% by mass, 17% by mass, 18% by mass, 19% by mass, 20% by mass, 25% by mass, 30% by mass, 35% by mass, 40% by mass, 45% by mass, 50% by mass, 55% by mass, and 60% by mass.

[0016] The mass ratio of natural pyrethrin to radical chain inhibitor contained in the composition of the present invention is preferably 1:0.05 to 1:6, more preferably 1:0.09 to 1:2.8, and even more preferably 1:0.14 to 1:1.7. Specific mass ratios include 1:0.05, 1:0.06, 1:0.07, 1:0.08, 1:0.09, 1:0.10, 1:0.11, 1:0.12, 1:0.13, 1:0.14, 1:0.15, 1:0.16, 1:0.17, 1:0.18, 1:0.19, 1:0.2, 1:0.3, 1:0.4, 1:0. Examples of mass ratios include 0.5, 1:0.6, 1:0.7, 1:0.8, 1:0.9, 1:1, 1:1.1, 1:1.2, 1:1.3, 1:1.4, 1:1.5, 1:1.6, 1:1.7, 1:1.8, 1:1.9, 1:2, 1:2.5, 1:3, 1:3.5, 1:4, 1:4.5, 1:5, 1:5.5, and 1:6. These mass ratios can also be expressed as "approximately." "Approximately" means plus or minus 10%, so for example, "approximately 1:2" means 1:1.8 to 1:2.2.

[0017] <Peroxide Decomposing Agents> The peroxide decomposing agents used in the present invention will now be described. In the present invention, a peroxide decomposing agent means a compound that has the effect of decomposing peroxides and converting them into more stable compounds. Peroxide inhibitors include phosphorus-based antioxidants and sulfur-based antioxidants. Phosphorus-based antioxidants can be suitably used as peroxide decomposing agents. Furthermore, multiple peroxide decomposing agents may be used in combination. Specific peroxide decomposing agents include, for example, triphenyl phosphite, tetraphenyldipropylene glycol diphosphite, diphenyl mono(2-ethylhexyl) phosphite, di-n-decylphenyl phosphite, 4,4'-butylidenebis(3-methyl-6-t-butylphenyl ditridecyl phosphite), 2-tert-butyl-6-methyl-4-{3-[(2,4,8,10-tetra-tert-butyldibenzo[d,f][1,3,2]dioxaphosphine-6-yl)oxy]propyl}phenol, tetra(C12-15 alkyl)-4,4'-isopropylidenediphenyl diphosphite, and triisodecyl phosphite. Among these, triphenyl phosphite, tetraphenyldipropylene glycol diphosphite, diphenyl mono(2-ethylhexyl) phosphite, di-n-decylphenyl phosphite, 4,4'-butylidenebis(3-methyl-6-t-butylphenyl ditridecyl phosphite), and tetra(C12-15 alkyl)-4,4'-isopropylidenediphenyl diphosphite are preferred, with triphenyl phosphite and 4,4'-butylidenebis(3-methyl-6-t-butylphenyl ditridecyl phosphite) being more preferred. Triphenyl phosphite (CAS registration number: 101-02-0) is commercially available, for example, as triphenyl phosphite (manufactured by Tokyo Chemical Industry Co., Ltd.) or ADEKA stub TPP (manufactured by ADEKA). Tetraphenyldipropylene glycol diphosphite (CAS registration number: 80584-85-6) is commercially available, for example, under the trade name JPP-100 (manufactured by Johoku Chemical Industry Co., Ltd.). Diphenyl mono(2-ethylhexyl) phosphite (CAS registration number: 15647-08-2) is commercially available, for example, under the trade name JPM-308 (manufactured by Johoku Chemical Industry Co., Ltd.).Di-n-decylphenyl phosphite (CAS registration number: 1254-78-0) is commercially available from many suppliers (e.g., Shaanxi Dideu Medichem). 4,4'-Butylidenebis(3-methyl-6-t-butylphenyl ditridecyl phosphite) (CAS registration number: 13003-12-8) is commercially available, for example, as JPH-1200 (manufactured by Johoku Chemical Industry). 2-tert-butyl-6-methyl-4-{3-[(2,4,8,10-tetra-tert-butyldibenzo[d,f][1,3,2]dioxaphosphine-6-yl)oxy]propyl}phenol (CAS registration number: 203255-81-6) is commercially available, for example, as SUMILIZER® GP (manufactured by Sumitomo Chemical Co., Ltd.). Tetra(C12-15 alkyl)-4,4'-isopropylidenediphenyl diphosphite (CAS registration number: 96152-48-6) is commercially available, for example, as Adeka Stab 1500 (manufactured by ADEKA). Triisodecyl phosphite (CAS registration number: 25448-25-3) is commercially available, for example, as Adeka Stab 3010 (manufactured by ADEKA). In one embodiment of the present invention, the content of the peroxide decomposing agent in the composition is preferably 1 to 30% by mass, more preferably 5 to 30% by mass, and even more preferably 10 to 20% by mass, based on the total amount of the composition. The specific content of the peroxide decomposer is 1% by mass, 2% by mass, 3% by mass, 4% by mass, 5% by mass, 6% by mass, 7% by mass, 8% by mass, 9% by mass, 10% by mass, 11% by mass, 12% by mass, 13% by mass, 14% by mass, 15% by mass. %, 16% by mass, 17% by mass, 18% by mass, 19% by mass, 20% by mass, 21% by mass, 22% by mass, 23% by mass, 24% by mass, 25% by mass, 26% by mass, 27% by mass, 28% by mass, 29% by mass, and 30% by mass.

[0018] The mass ratio of natural pyrethrin to peroxide decomposing agent contained in the composition of the present invention is preferably 1:0.013 to 1:3, more preferably 1:0.09 to 1:1.5, and even more preferably 1:0.33 to 1:0.67. Specific mass ratios include 1:0.02, 1:0.03, 1:0.04, 1:0.05, 1:0.06, 1:0.07, 1:0.08, 1:0.09, 1:0.1, 1:0.2, 1:0.3, 1:0.4, 1:0.5, 1:0.6, 1:0.7, 1:0.8, 1:0.9, 1:1, 1:1.5, 1:2, 1:2.5, and 1:3.

[0019] The mass ratio of the radical chain inhibitor to the peroxide decomposing agent contained in the composition of the present invention is preferably 1:0.017 to 1:7.5, more preferably 1:0.09 to 1:6, and even more preferably 1:0.20 to 1:2.9. Specific ratios include 1:0.02, 1:0.03, 1:0.04, 1:0.05, 1:0.06, 1:0.07, 1:0.08, 1:0.09, 1:0.1, 1:0.2, 1:0.3, 1:0.4, 1:0.5, 1:0.6, 1:0.7, 1:0.8, 1:0.9, 1:1, 1:1.5, 1:2, 1:2.5, 1:3, 1:3.5, 1:4, 1:4.5, 1:5, 1:5.5, 1:6, 1:6.5, 1:7, and 1:7.5.

[0020] <Solvents> Examples of solvents (also called solvents) used in the present invention include ester-based solvents and hydrocarbon-based solvents. Specific examples of ester-based solvents include diisodecyl phthalate, di-2-ethylhexyl phthalate, diisopropyl adipate, diisobutyl adipate, diisodecyl adipate, di-n-octyl sebacate, diisononyl adipate, di-2-ethylhexyl sebacate, di-2-ethylhexyl azelate, di-n-hexyl azelate, di-2-ethylhexyl dodecanoate, dibutoxyethoxyethyl adipate, isopropyl palmitate, dioctyl adipate, di-n-butyl sebacate, acetyl tributyl citrate, di-2-ethylhexyl malate, isopropyl myristate, benzyl acetate, sucrose fatty acid esters, and sorbitan fatty acid esters. Examples of hydrocarbon solvents include n-paraffinic solvents, isoparaffinic solvents, and naphthenic solvents. Specific examples of n-paraffinic solvents include dodecane, tridecane, tetradecane, pentadecane, Norper 13 (trade name, manufactured by ExxonMobil Chemicals Ltd.), Norper 15 (trade name, manufactured by ExxonMobil Chemicals Ltd.), n-paraffin grade M (trade name, manufactured by Nippon Oil Corporation), n-paraffin grade H (trade name, manufactured by Nippon Oil Corporation), and Neothiosol (trade name, manufactured by Chuo Chemical Co., Ltd.). Specific examples of isoparaffinic solvents include Isopar M (trade name, manufactured by ExxonMobil), Isopar V (trade name, manufactured by ExxonMobil), IP Solvent 2028 (trade name, manufactured by Idemitsu Kosan Co., Ltd.), IP Solvent 2835 (trade name, manufactured by Idemitsu Kosan Co., Ltd.), and Shellsol™ (trade name, manufactured by Shell Chemicals Japan Co., Ltd.). Specific naphthenic solvents include, for example, Exsol D80 (trade name, manufactured by ExxonMobil), Exsol D110 (trade name, manufactured by ExxonMobil), and Exsol D130 (trade name, manufactured by ExxonMobil). Kerosene can also be used. Mineral spirits (CAS registration number: 64742-47-8) can also be suitably used.Other solvents include, for example, isopropanol, ethanol, propylene carbonate, 1,3-butylene glycol, polyoxyethylene hydrogenated castor oil, and olive oil. Two or more of the above solvents may be used in combination, and solvents with different properties such as polarity can be combined. When using solvents with different properties in this way, one of them can be used as an auxiliary solvent. For example, when an n-paraffinic solvent, an isoparaffinic solvent, or a naphthenic solvent is used as the solvent, diisopropyl adipate or isopropyl myristate can be used as an auxiliary solvent.

[0021] In one embodiment of the present invention, the solvent content in the composition (including the amount of auxiliary solvent if further containing auxiliary solvents) is preferably 10 to 75% by mass, more preferably 20 to 55% by mass, and even more preferably 30 to 55% by mass, based on the total amount of the composition of the present invention. Specific solvent content examples include 10% by mass, 15% by mass, 20% by mass, 25% by mass, 30% by mass, 35% by mass, 40% by mass, 45% by mass, 50% by mass, 55% by mass, 60% by mass, 65% by mass, 70% by mass, and 75% by mass.

[0022] <Viscosity> The composition of the present invention has a specific ratio (V2 / V1) of viscosity V2 (mPa·s) after storage at 90°C for 3 weeks to the initial viscosity V1 (mPa·s). By formulating a composition containing natural pyrethrin, a radical chain inhibitor, a peroxide decomposer, and a solvent, the viscosity V1 (mPa·s) of the initial composition and the viscosity V2 (mPa·s) of the composition after storage at 90°C for 3 weeks can be adjusted.

[0023] In this invention, viscosity refers to viscosity (mPa·s) measured using a rheometer. For example, a Modular Compact Rheometer MCR302 (manufactured by Anton Paar) can be used as the rheometer. In this case, the measurement can be performed under the following conditions: rotor: No. CP50-0.5, gap distance between rotor and sample surface: 0.2 mm, measurement temperature: 25°C, and shear rate: 10⁷ (1 / s). The initial viscosity V1 (mPa·s) of the composition is the viscosity measured using the rheometer after the composition has been prepared and without being exposed to high temperatures (e.g., 40°C or higher). The viscosity V2 (mPa·s) of the composition after storage at 90°C for 3 weeks is the viscosity measured using the rheometer after the composition has been prepared and left to stand for 3 weeks in a constant temperature oven set to 90°C.

[0024] In one embodiment of the present invention, the ratio of the viscosity of the composition after storage at 90°C for three weeks to the initial viscosity of the composition V1 (mPa·s) (V2 / V1) is usually 1 to 5, preferably 1 to 4, and more preferably 1 to 3. Specific values ​​of V2 / V1 include 1.0, 1.1, 1.2, 1.3, 1.4, 1.5, 1.6, 1.7, 1.8, 1.9, 2.0, 2.1, 2.2, 2.3, 2.4, 2.5, 2.6, 2.7, 2.8, 2.9, 3.0, 3.1, 3.2, 3.3, 3.4, 3.5, 3.6, 3.7, 3.8, 3.9, 4.0, 4.1, 4.2, 4.3, 4.4, 4.5, 4.6, 4.7, 4.8, 4.9, and 5.0. In one embodiment of the present invention, the initial composition viscosity V1 (mPa·s) is preferably 2 to 40, more preferably 2 to 30, and even more preferably 2 to 20. Specific initial composition viscosities (V1) include 2 mPa·s, 3 mPa·s, 4 mPa·s, 5 mPa·s, 6 mPa·s, 7 mPa·s, 8 mPa·s, 9 mPa·s, 10 mPa·s, 11 mPa·s, 12 mPa·s, 13 mPa·s, 14 mPa·s, 15 mPa·s, 16 mPa·s, 17 mPa·s, 18 mPa·s, 19 mPa·s, 20 mPa·s, Examples include 21 mPa·s, 22 mPa·s, 23 mPa·s, 24 mPa·s, 25 mPa·s, 26 mPa·s, 27 mPa·s, 28 mPa·s, 29 mPa·s, 30 mPa·s, 31 mPa·s, 32 mPa·s, 33 mPa·s, 34 mPa·s, 35 mPa·s, 36 mPa·s, 37 mPa·s, 38 mPa·s, 39 mPa·s, and 40 mPa·s.

[0025] <Manufacturing Use Product> The composition of the present invention may be a manufacturing use product for manufacturing industrial products such as pest control agents. In this specification, the manufacturing use product may be referred to as a Manufacturing Use Product (hereinafter sometimes abbreviated as MUP).

[0026] In one embodiment of the present invention, a composition comprising a natural pyrethrin, a radical chain inhibitor, a peroxide decomposer, and a solvent, wherein the ratio of the viscosity V2 (mPa·s) after storage at 90°C for 3 weeks to the initial viscosity V1 (mPa·s) of the composition (V2 / V1) is 1 to 5, is used as an MUP.

[0027] In another embodiment of the present invention, a composition comprising a natural pyrethrin, a radical chain inhibitor, a peroxide decomposer, and a solvent, wherein the ratio of the viscosity V2 (mPa·s) after storage at 90°C for 3 weeks to the viscosity V1 (mPa·s) of the initial composition (V2 / V1) is 1 to 5, is used as an MUP for the manufacture of a heat-evaporative insecticide. In this case, the composition may be mixed with a diluent solvent.

[0028] In yet another embodiment of the present invention, a composition comprising a natural pyrethrin, a radical chain inhibitor, a peroxide decomposer, and a solvent, wherein the ratio of the viscosity V2 (mPa·s) after storage at 90°C for 3 weeks to the viscosity V1 (mPa·s) of the initial composition (V2 / V1) is 1 to 5, is used as a MUP for the production of pest control mats. In this case, the composition may be mixed with a solid carrier or added to a mat material.

[0029] <Heat-Vaporized Insecticide> The heat-vaporized insecticide according to one embodiment of the present invention is a formulation that can be used in a heat-vaporized insecticide device 100, such as the one shown in Figure 1. The heat-vaporized insecticide (solution 1) is filled into a liquid bottle 4. A portion of the liquid-absorbing wick 3 is immersed in the solution 1, and the liquid-absorbing wick is made to absorb the heat-vaporized insecticide, and the upper part of the liquid-absorbing wick can be heated by a heating element 2 (the heating element is also called a heat-generating element). By indirectly heating the upper part of the liquid-absorbing wick to a temperature of about 60°C to about 150°C with the heating element 2, the natural pyrethrin contained in the heat-vaporized insecticide absorbed by the liquid-absorbing wick is vaporized into the atmosphere, thereby controlling pests. The heat-vaporized insecticide according to one embodiment of the present invention is not limited to the device shown in Figure 1, but can be applied to conventionally known heat-vaporized insecticide devices, and both can produce excellent effects. A heat-vaporation type insecticide apparatus to which the heat-vaporation insecticide formulation of the present invention can be applied is also described in, for example, Japanese Patent Publication No. 52-12106, Japanese Utility Model Publication No. 58-45670, and Japanese Patent Publication No. 2012-176947.

[0030] While heating elements (heating element 2) that generate heat when electricity is applied are commonly used as heating elements (heating element 2) in heat vaporization type insecticide devices, the device is not limited to these, and any known heating element such as an air oxidation heating element or a heating element utilizing a platinum catalyst can be used.

[0031] The liquid-absorbing core 3 is generally classified into fired cores, porous ceramic cores, resin cores, felt cores, braided cores, and adhesive cores. In the present invention, fired cores, porous ceramic cores, resin cores, and felt cores are preferably used, and fired cores or porous ceramic cores are more preferably used. The material of the fired core is not particularly limited, as long as it is stable to heat-evaporative insect control formulations and capable of absorbing the solution by capillary action. The fired core is obtained by firing a mixture containing (a) an inorganic substance (inorganic powder, inorganic binder, etc.), or preferably (b) an organic substance (carbonaceous powder, organic binder, etc.) at 600 to 2000°C. Here, there are also fired cores that consist almost entirely of (a) with a small amount of (b), and such fired cores are sometimes called porous ceramic cores. The inorganic substance contains inorganic powder as an essential component, but may also contain an inorganic binder as an auxiliary component as needed. Examples of inorganic powders include steatite, alumina, silica, talc, calcite, perlite, mullite, cordierite, mica, zirconia, diatomaceous earth, gypsum, acid clay, fiberglass, and asbestos. Examples of inorganic binders include various clays such as clay (kaolin clay), bentonite, and halosite, as well as tar pitch and water glass. Of these, clay is a preferred material because of its excellent binding properties. The above inorganic binders may be used individually or in a mixture of multiple types. Examples of organic substances include carbonaceous powders such as wood flour, activated carbon, charcoal, diatomaceous earth, graphite, carbon black, and coke, or organic binders such as carboxymethylcellulose (CMC), acrylic resin, polyolefin resin, starch (pregelatinized starch, etc.), gum arabic, gelatin, and polyvinyl alcohol. The resin core is formed by covering the outer surface of the core material with a sheath material for absorbing and vaporizing a heat-dispersing insect control agent. For example, it can be formed from thermoplastic and / or thermosetting synthetic resins having a heat resistance of 130°C or higher, such as synthetic fibers like polyester and nylon, inorganic fibers, or plastic materials like polyethylene, polypropylene, polyvinyl chloride, polyacrylic, and phenolic resin.The sheath material that forms the inside of the core material is usually formed as a fiber aggregate, and the fibers that make up this include felt, cotton, pulp, nonwoven fabric, asbestos, inorganic molded products, as well as synthetic fibers such as polyester and highly absorbent wood. The liquid-absorbing core may also contain dyes, preservatives, or antioxidants as appropriate, for example, by mixing them during the bonding of the inorganic powder and the adhesive. Commercially available liquid-absorbing cores can be used, and examples of such commercially available liquid-absorbing cores include Fuji-Chem HK-100 (manufactured by Fuji Chemical Co., Ltd.) and Rauschert Steatite 45% (manufactured by Rauschert).

[0032] When the composition of the present invention is applied to a heat-evaporative insecticide formulation, it may be used in combination with a diluent. The diluent may be the same as the solvent exemplified for the composition of the present invention described above, or a different solvent may be used.

[0033] When the composition of the present invention is applied to a heat-evaporative insecticide formulation, the content of natural pyrethrin is preferably 0.3 to 1.8% by mass, more preferably 0.4 to 1.5% by mass, based on the total amount of the heat-evaporative insecticide formulation. Even more preferably, it is 0.6 to 1.5% by mass. Specific natural pyrethrin content includes 0.3% by mass, 0.4% by mass, 0.5% by mass, 0.6% by mass, 0.7% by mass, 0.8% by mass, 0.9% by mass, 1.0% by mass, 1.1% by mass, 1.2% by mass, 1.3% by mass, 1.4% by mass, 1.5% by mass, 1.6% by mass, 1.7% by mass, and 1.8% by mass.

[0034] When the composition of the present invention is applied to a heat-evaporative insecticide formulation, the content of the radical chain inhibitor is preferably 0.1 to 10% by mass, more preferably 0.2 to 8.0% by mass, and even more preferably 0.25 to 6.0% by mass, based on the total amount of the heat-evaporative insecticide formulation. Specific radical chain inhibitor contentes include 0.15% by mass, 0.2% by mass, 0.3% by mass, 0.4% by mass, 0.5% by mass, 0.6% by mass, 0.7% by mass, 0.8% by mass, 0.9% by mass, 1.0% by mass, 2.0% by mass, 3.0% by mass, 4.0% by mass, 5.0% by mass, 6.0% by mass, 7.0% by mass, 8.0% by mass, and 9.0% by mass.

[0035] When the composition of the present invention is applied to a heat-evaporative insecticide formulation, the content of the peroxide decomposing agent is preferably 0.1 to 2.0% by mass, more preferably 0.2 to 1.0% by mass, and even more preferably 0.2 to 0.6% by mass, based on the total amount of the heat-evaporative insecticide formulation. Specific peroxide decomposing agent contentes include 0.1% by mass, 0.2% by mass, 0.3% by mass, 0.4% by mass, 0.5% by mass, 0.6% by mass, 0.7% by mass, 0.8% by mass, 0.9% by mass, 1.0% by mass, 1.1% by mass, 1.2% by mass, 1.3% by mass, 1.4% by mass, 1.5% by mass, 1.6% by mass, 1.7% by mass, 1.8% by mass, 1.9% by mass, and 2.0% by mass.

[0036] When the composition of the present invention is applied to a heat-evaporative insecticide formulation, the solvent (including the amounts of auxiliary solvents and diluents if applicable) is preferably 60 to 99.5% by mass, and more preferably 70 to 99% by mass, of the total amount of the composition of the present invention. Specific solvent content (including the amounts of auxiliary solvents and diluents if applicable) can be found to be 61% by mass, 62% by mass, 63% by mass, 64% by mass, 65% by mass, 66% by mass, 67% by mass, 68% by mass, 69% by mass, 70% by mass, 71% by mass, 72% by mass, 73% by mass, 74% by mass, 75% by mass, 76% by mass, 77% by mass, 78% by mass, 79% by mass, 80% by mass, 81% by mass, 82% by mass, 83% by mass, 84% by mass, 85% by mass, 86% by mass, 87% by mass, 88% by mass, 89% by mass, 90% by mass, 91% by mass, 92% by mass, 93% by mass, 94% by mass, 95% by mass, 96% by mass, 97% by mass, 98% by mass, and 99% by mass.

[0037] When the composition of the present invention is applied to a heat-evaporative insecticide formulation, other ingredients such as other insecticidal active ingredients, thickeners, surfactants, stabilizers, preservatives, essential oils, or synergists may be included as formulation aids.

[0038] In one embodiment, the heat vaporization insect control formulation of the present invention is obtained by mixing a composition containing natural pyrethrin, a radical chain inhibitor, a peroxide decomposer, and a solvent, a dilution solvent, and a formulation aid added as needed, until homogeneous.

[0039] In one embodiment, the heat vaporization insect control formulation of the present invention is obtained by mixing each component of "a composition comprising a natural pyrethrin, a radical chain inhibitor, a peroxide decomposer, and a solvent, wherein the ratio of the viscosity V2 (mPa·s) after storage at 90°C for 3 weeks to the initial viscosity V1 (mPa·s) of the composition (V2 / V1) is 1 to 5" with a dilution solvent and a formulation aid added as needed until uniform.

[0040] One embodiment of the present invention is a method for controlling pests, comprising the step of vaporizing natural pyrethrin into space using a heat vaporization type insecticide device equipped with a liquid medicine bottle filled with the heat vaporization insecticide, a liquid-absorbing wick, and a heating element. Another embodiment of the present invention is a method for controlling pests, comprising the step of vaporizing natural pyrethrin into space by heating the heat vaporization insecticide by using a heat vaporization type insecticide device equipped with a liquid medicine bottle filled with the heat vaporization insecticide, a liquid-absorbing wick, and a heating element. Another embodiment of the present invention is a method for controlling pests, wherein the heating of the heat vaporization insecticide is performed by having a liquid-absorbing wick absorb the heat vaporization insecticide and heating the upper part of the liquid-absorbing wick with a heating element. Another embodiment of the present invention is a method of controlling pests, wherein the upper part of the liquid-absorbing wick is heated with a heating element, thereby indirectly heating the upper part of the liquid-absorbing wick to a temperature of about 60°C to about 150°C (for example, 60°C, 70°C, 80°C, 90°C, 100°C, 110°C, 120°C, 130°C, 140°C, 150°C). Yet another embodiment of the present invention is a method of controlling pests, wherein the space from which the natural pyrethrin is evaporated includes at least one selected from entrances, corridors, toilets, washrooms, bathrooms, changing rooms, verandas, balconies, attics, stairs, garages, warehouses, attic storage, pantries, libraries, closets, storage rooms, living rooms, bedrooms, dining rooms, and outdoors (for example, gardens, yards, campgrounds, sports fields, forests).

[0041] The pest control targets in the present invention include various harmful insects and arthropods such as mites. Specific pest control targets include harmful flying pests, such as mosquitoes like Aedes aegypti, Aedes albopictus, Culex tritaeniorhynchus, and Ochlerotatus togoi, midges like Simulium rugglesi and Simulium vittatum, black flies like Simulium nagasakiense, midges, house flies like Musca domestica, Musca autumnalis, and Fannia canicularis, blow flies, flesh flies, Drosophila flies, butterfly flies, biting flies, horse flies, snipe flies, and tsetse flies. Among them, mosquitoes such as mosquitoes, midges, and black flies are preferred pest control targets. In the present invention, it is also effective against mosquitoes, flies, fleas, bed bugs, house dust mites, cockroaches, ticks, etc., which are classified as sanitary pests that cause human diseases by transmitting diseases, and these sanitary pests are also listed as pest control targets.

[0042] Another embodiment of the present invention is a method in which the pest control method is a method for controlling sanitary pests. As used herein, "control" is a concept that includes extermination, repellency, and prevention. "Extermination" represents a concept that includes killing, knocking down, driving away, or not attracting pest control target pests, and it is preferable to kill or knock down the pests.

[0043] <Insect Control Mat> One embodiment of the present invention is an insect control mat containing the composition of the present invention and a solid carrier. The insect control mat may also be referred to as an electric mosquito trap mat. In this specification, the insect control mat formulation means a composition for manufacturing an insect control mat. In this case, it is preferable that each component, such as natural pyrethroid, is supported on the solid carrier. As one embodiment of the present invention, the insect control mat according to the present invention can be manufactured by molding and processing the insect control mat formulation into an insect control mat of a desired shape. Another embodiment of the present invention is an insect control mat in which each component, such as natural pyrethroid, is impregnated or adsorbed onto the blank mat material, where the solid carrier is a blank mat material composed of a fibrous carrier or a porous carrier. When the composition of the present invention is applied to an insect control mat, it is preferable that the composition of the present invention is supported on the solid carrier. The solid carrier is not particularly limited as long as it does not impair the effects of the present invention, but examples of solid carriers include the following.Inorganic materials: Minerals (natural silicates, marble, pumice, limestone, rare earth minerals, cryolite, activated clay, lime, activated carbon, talc, attapulgite, sodium montmorillonite, calcium montmorillonite, kaolinite, calcite, dolomite, diatomite, bentonite, zeolite, sepiolite, pyrophyllite, vermiculite, crystalline silica, amorphous silica, etc.), silicon dioxide, calcium sulfate, magnesium sulfate, barium sulfate, magnesium oxide, aluminum oxide, ammonium sulfate, ammonium phosphate, ammonium nitrate, calcium phosphate, sulfur, calcium carbonate, sodium bicarbonate, sodium carbonate, synthetic silicates, and their pulverized products; Organic materials: grain powders (rice bran, rice flour, corn flour, wheat flour, etc.), sugars (cellulose, starch, lactose, glucose, fructose, sucrose, etc.), plant-derived powders (nut shell powders (coconut, walnut, peanut, etc.), tree-derived powders (bark powder, sawdust, etc.), other plant powders (tobacco stems, soybeans, cottonseed husks, etc.)), lignin, wax, seashells, urea, polyethylene, polypropylene, polyvinyl alcohol, polycarbonate, polyester, polyamide, polyurethane, polyvinyl chloride, polyvinyl acetate, ethylene-vinyl acetate copolymer, ethylene-methyl methacrylate copolymer, polyvinylpyrrolidone-methacrylic acid copolymer, polyvinylpyrrolidone-vinyl acetate copolymer, cellulose derivatives, phenolic resins, melamine resins, epoxy resins. The above solid carriers may also be used as adsorbent carriers.

[0044] In one embodiment of the present invention, the solid carrier may be one or more solid carriers selected from the group consisting of minerals, silicon dioxide, calcium sulfate, magnesium sulfate, barium sulfate, magnesium oxide, aluminum oxide, ammonium sulfate, ammonium phosphate, ammonium nitrate, calcium phosphate, sulfur, calcium carbonate, sodium bicarbonate, sodium carbonate, synthetic silicates, grain powders, sugars, plant-derived powders, tree-derived powders, other plant pulverized materials, lignin, wax, seashells, urea, polyethylene, polypropylene, polyvinyl alcohol, polycarbonate, polyester, polyamide, polyurethane, polyvinyl chloride, polyvinyl acetate, ethylene-vinyl acetate copolymer, ethylene-methyl methacrylate copolymer, polyvinylpyrrolidone-methacrylic acid copolymer, polyvinylpyrrolidone-vinyl acetate copolymer, cellulose derivatives, phenolic resins, melamine resins, and epoxy resins.

[0045] In another embodiment of the present invention, the solid carrier may be a blank mat material composed of a fibrous carrier or a porous carrier. Examples of such fibrous carriers include natural fibers such as pulp, cotton linters, cellulose, and cotton; synthetic fibers such as polyester and acrylic; and inorganic fibers such as glass fibers and asbestos. Examples of porous carriers include those made by bonding inorganic powders such as clay, talc, kaolin, silica, calcite, diatomaceous earth, gypsum, perlite, bentonite, acid clay, glass fiber, or asbestos with an adhesive such as carboxymethylcellulose, starch, gum arabic, gelatin, or polyvinyl alcohol and forming them into a mat; or those made by solidifying inorganic substances such as clay, talc, bentonite, alumina, silica, or calcite into a mat and firing it; or those made by molding and processing resin into a mat; or those made by bundling glass fibers into a mat. The blank mat material may also appropriately contain pigments, preservatives, fragrances, etc. During the bonding of the inorganic powder and the adhesive, the various components described above or below can be mixed and molded into a mat to retain the various components. The solid carriers are all known solid carriers, and each can be manufactured or obtained by manufacturing according to known methods or in accordance with known methods, or by obtaining commercially available products. In one embodiment, the components of the present invention may be supported on the solid carrier by adsorbing the composition of the present invention and other components selected as desired onto the solid carrier. Alternatively, the components may be supported on the solid carrier by impregnating the solid carrier with the composition of the present invention and other components selected as desired. In the above manufacturing method, the composition of the present invention and other components selected as desired can be pre-mixed, or each component can be supported on the solid carrier simultaneously or separately without pre-mixing. In this case, it is preferable to pre-mix each component before supporting it on the solid carrier, and it is more preferable to pre-mix each component into a homogeneous solution before supporting it on the solid carrier. The methods and conditions for mixing and / or supporting each of the above components onto a solid carrier can be those of known methods and conditions.In one embodiment, the pest control mat according to the present invention can be produced by molding and processing a composition containing the composition of the present invention, other components optionally selected, and a solid carrier into a pest control mat having a desired shape. In one embodiment, a composition containing "natural pyrethrin, a radical chain inhibitor, a peroxide decomposer, and a solvent, wherein the ratio (V2 / V1) of the viscosity V2 (mPa·s) after storage at 90°C for 3 weeks to the viscosity V1 (mPa·s) of the initial composition of the composition is 1 to 5", other components optionally selected, and a solid carrier is molded and processed into a pest control mat having a desired shape to produce the pest control mat according to the present invention. Another embodiment of the present invention is a pest control mat in which the composition of the present invention and other components optionally selected are impregnated or adsorbed on the blank mat material when the solid carrier is a blank mat material composed of a fibrous carrier or a porous carrier. Another embodiment of the present invention is a pest control mat in which the components constituting the "composition containing natural pyrethrin, a radical chain inhibitor, a peroxide decomposer, and a solvent, wherein the ratio (V2 / V1) of the viscosity V2 (mPa·s) after storage at 90°C for 3 weeks to the viscosity V1 (mPa·s) of the initial composition of the composition is 1 to 5", and other components optionally selected are impregnated or adsorbed on the blank mat material when the solid carrier is a blank mat material composed of a fibrous carrier or a porous carrier.

[0046] The size of the blank mat material composed of a fibrous carrier or a porous carrier used in one embodiment of the present invention is the apparent volume before impregnating or adsorbing and holding the composition of the present invention and other components optionally selected, and is usually 2.0 to 4.0 cm 3 (for example, 2.2 cm × 3.5 cm × 0.28 cm (about 2.2 cm 3 ), 3.8 cm × 4.8 cm × 0.20 cm (about 3.6 cm 3 ) and can be in the range of about).

[0047] In the pest control mat of one embodiment of the present invention, the blank mat material is 2.2 cm 3In this case, the total amount of the composition of the present invention and other optionally selected components can typically be held in a quantity of 20 to 1600 mg. In another embodiment of the present invention, a pest control mat is made by impregnating or adsorbing the composition of the present invention and other optionally selected components onto a blank mat material of a different size than the apparent volume of the blank mat material exemplified above, and holding the blank mat material in a quantity of 2.2 cm. 3 The composition of the present invention can be manufactured by molding and processing it to a desired size such that the total amount of the composition and other components selected as desired is typically 20 to 1600 mg per unit.

[0048] Another embodiment of the present invention provides a pest control mat formulation containing the composition of the present invention, other components optionally selected, and a solid carrier, applied to a 2.2 cm pest control mat. 3 The present invention can be manufactured by molding and processing the blank mat into an insect control mat such that the total amount of the present invention composition and other optionally selected components is typically 20 to 1600 mg per mat. The methods for impregnating or adsorbing the present invention composition and other optionally selected components into the blank mat material, and for molding and processing it into a desired shape and size, can each be carried out by applying known methods.

[0049] Furthermore, a method for molding and processing a formulation for pest control mats containing the composition of the present invention, other components selected as desired, and a solid carrier into a desired pest control mat can be carried out by applying known methods. For example, such a pest control mat can be manufactured in a manner similar to that of a substrate used in an air treatment apparatus described in JP 2009-526056. JP 2009-526056 discloses a substrate having a pore network structure formed by adhering granular particles, and capable of supporting air treatment chemicals such as natural pyrethrins within these pores. Such a substrate can be attached to an air treatment apparatus described in JP 2009-526056 and heated to release air treatment chemicals such as natural pyrethrins from the substrate. That is, similar to the substrate in JP 2009-526056, a pest control mat can be manufactured by solidifying a formulation for pest control mats containing the composition of the present invention, other components selected as desired, and a solid carrier into a predetermined shape. In one embodiment of the present invention, the insect control mat can appropriately contain other insect control active compounds, repellents, etc., which is expected to further improve its effectiveness.

[0050] When the composition of the present invention is applied to an insect control mat, the mass ratio of natural pyrethrin to solid carrier contained in the insect control mat is preferably 1:3.5 to 1:70, more preferably 1:4.7 to 1:47, and even more preferably 1:5.8 to 1:35. Specific mass ratios of natural pyrethrin to solid carrier include 1:4, 1:5, 1:6, 1:7, 1:8, 1:9, 1:10, 1:15, 1:20, 1:25, 1:30, 1:35, 1:40, 1:45, 1:50, 1:55, 1:60, and 1:65.

[0051] When the composition of the present invention is applied to an insect control mat, other components such as thickeners, surfactants, stabilizers, preservatives, or synergists may be included as formulation aids.

[0052] One embodiment of the present invention is an insect control mat 11 used in a heat vaporization type insecticide device 200, as shown in Figure 2. In the heat vaporization type insecticide device 200 of Figure 2, the insect control mat 11 is placed on a hot plate 10, and the hot plate is heated to approximately 140 to 200°C, thereby vaporizing natural pyrethrins and the like held in the insect control mat into the atmosphere, and thus controlling insects.

[0053] Furthermore, one embodiment of the present invention is a formulation for pest control mats that can be used to manufacture pest control mats used in the heat vaporization type insecticide device described in Japanese Patent Publication No. 11-510055. In the heat vaporization type insecticide device described in Japanese Patent Publication No. 11-510055, pests can be controlled by burning a fuel such as butane gas to heat the pest control mat to about 120 to 200°C, thereby vaporizing natural pyrethrins and the like that held in the pest control mat into the atmosphere. That is, while the heat vaporization type insecticide device 200 shown in Figure 2 heats the hot plate 10 by electric heating, the heat vaporization type insecticide device described in Japanese Patent Publication No. 11-510055 heats the hot plate inside the device by burning a fuel such as butane gas. Although there are differences in the heat source and heating temperature between the two, the principle of vaporizing natural pyrethrins and the like that held in the pest control mat into the atmosphere by heating is the same.

[0054] The insect control mat formulation of one embodiment of the present invention can be molded and processed to take the shape of a conventionally known insect control mat, and is not limited to the apparatus shown in Figure 2, but can be applied to a heat vaporization type insecticide apparatus that uses a conventionally known insect control mat, and both can exhibit excellent effects. In one embodiment of the present invention, the insect control mat contains the composition of the present invention, a mat material as a solid carrier, and may also contain a solvent (also called a solvent), a dye, a stabilizer, a fragrance, etc. as appropriate.

[0055] Further solvents that can be used in the pest control mat include those exemplified in the composition of the present invention described above. The pest control mat may contain one or more of these solvents as further solvents.

[0056] When the composition of the present invention is applied to an insect control mat, the content of natural pyrethrin is preferably 1 to 20% by mass, more preferably 1 to 10% by mass, based on the total amount of the insect control mat. Even more preferably, it is 1.5 to 7% by mass. Specific natural pyrethrin content includes 1% by mass, 1.5% by mass, 2% by mass, 2.5% by mass, 3% by mass, 4% by mass, 5% by mass, 6% by mass, 7% by mass, 8% by mass, 9% by mass, 10% by mass, 11% by mass, 12% by mass, 13% by mass, 14% by mass, 15% by mass, 16% by mass, 17% by mass, 18% by mass, 19% by mass, and 20% by mass.

[0057] When the composition of the present invention is applied to an insect control mat, the content of the peroxide decomposing agent is preferably 1 to 10% by mass, more preferably 1 to 5% by mass, and even more preferably 1 to 2% by mass, based on the total amount of the insect control mat. Specific content of the radical chain inhibitor includes 1% by mass, 1.5% by mass, 2% by mass, 2.5% by mass, 3% by mass, 4% by mass, 5% by mass, 6% by mass, 7% by mass, 8% by mass, 9% by mass, and 10% by mass.

[0058] When the composition of the present invention is applied to an insect control mat, the content of the radical chain inhibitor is preferably 1 to 20% by mass, more preferably 1 to 15% by mass, and even more preferably 2 to 10% by mass, based on the total amount of the insect control mat. Specific peroxide decomposing agent content includes 1% by mass, 2% by mass, 3% by mass, 4% by mass, 5% by mass, 6% by mass, 7% by mass, 8% by mass, 9% by mass, 10% by mass, 11% by mass, 12% by mass, 13% by mass, 14% by mass, 15% by mass, 16% by mass, 17% by mass, 18% by mass, 19% by mass, and 20% by mass.

[0059] When the composition of the present invention is applied to an insect control mat, the content of the solid carrier is preferably 30 to 60% by mass, more preferably 35 to 55% by mass, and even more preferably 40 to 50% by mass, based on the total amount of the insect control mat. Specific solid carrier contents include 30%, 35%, 40%, 45%, 50%, 55%, and 60% by mass.

[0060] When the composition of the present invention is applied to an insect control mat, the content of the solvent (including the amount of auxiliary solvents and further solvents if any are included) is preferably 20 to 65% by mass, more preferably 30 to 60% by mass, and even more preferably 40 to 50% by mass, based on the total amount of the insect control mat. Specific solvent content examples include 20% by mass, 25% by mass, 30% by mass, 35% by mass, 40% by mass, 45% by mass, 50% by mass, 55% by mass, 60% by mass, 65% by mass, and 70% by mass.

[0061] One embodiment of the present invention is a method for controlling pests, which includes the step of heating the pest control mat to vaporize natural pyrethrins into the air.

[0062] Another embodiment of the present invention is a method of controlling pests in which heating of the pest control mat is performed by placing the pest control mat on a hot plate and heating the pest control mat with the heated hot plate. Yet another embodiment of the present invention is a method of controlling pests in which heating with the hot plate is performed by heating the hot plate to a temperature of approximately 140 to 200°C (for example, 140°C, 150°C, 160°C, 170°C, 180°C, 190°C, 200°C) by electric heating. Yet another embodiment of the present invention is a method of controlling pests in which heating with the hot plate is performed by heating the hot plate to a temperature of approximately 120 to 200°C (for example, 120°C, 130°C, 140°C, 150°C, 160°C, 170°C, 180°C, 190°C, 200°C) by burning fuel.

[0063] A further embodiment of the present invention is a method of controlling pests, wherein the space from which the natural pyrethrin is evaporated includes at least one selected from entrances, corridors, toilets, washrooms, bathrooms, changing rooms, verandas, balconies, attics, stairs, garages, warehouses, attic storage, pantries, libraries, closets, cupboards, living rooms, bedrooms, dining rooms, and outdoors (e.g., gardens, yards, campgrounds, sports fields, forests).

[0064] The pests that can be controlled by the composition and pest control method of the present invention include various harmful insects and arthropods such as mites. Specifically, the pests that can be controlled include harmful flying insects such as Culex pipiens, Culex tritaeniorhynchus, Culex aeruginosa, and Culex pipiens; Aedes mosquitoes such as Aedes aegypti and Aedes albopictus; Anopheles mosquitoes such as Anopheles sinensis; midges; houseflies such as Muscicapa japonica, Muscicapa fuscipes, and Muscicapa japonica; blowflies, flesh flies, Drosophila, moth flies, phorid flies, horseflies, gnats, stable flies, and biting midges. Among these, mosquitoes such as Culex pipiens, Aedes mosquitoes, and Anopheles mosquitoes are particularly suitable as pests to be controlled. Furthermore, the composition of the present invention and the pest control method of the present invention are also effective against mosquitoes, flies, fleas, bed bugs, house dust mites, indoor dust mites, cockroaches, ticks, etc., which are classified as sanitary pests that transmit diseases and cause illness in humans, and these sanitary pests can also be listed as target pests for control. Another embodiment of the present invention is a method in which the above-mentioned pest control method is a method for exterminating sanitary pests. In this specification, "control" is a concept that includes extermination, repellent and prevention. "Extermination" is a concept that includes killing, knocking down, driving away or keeping away target pests, and it is preferable to kill or knock down the pests.

[0065] The present invention will be described in more detail below with reference to examples such as manufacturing examples and test examples, but the present invention is not limited to these examples.

[0066] Manufacturing Examples 1, 2, and Comparative Manufacturing Example 1 (MUP Manufacturing) Each component was mixed to obtain the composition shown in Table 1 to prepare MUPs for Manufacturing Examples 1, 2, and Comparative Manufacturing Example 1 (hereinafter sometimes referred to as MUP1, MUP2, and Comparative MUP1).

[0067] In the table, radical chain inhibitor 1 is represented as BHT; radical chain inhibitor 2 as BHA; peroxide decomposer 1 as 4,4'-butylidenebis(3-methyl-6-t-butylphenyl ditridecyl phosphite) (JPH-1200 (manufactured by Johoku Chemical Industry)); peroxide decomposer 2 as triphenyl phosphite (ADEKA TPP (manufactured by ADEKA)); solvent 1 as mineral spirits; solvent 2 as isoparaffinic solvent (Isopar M (manufactured by ExxonMobil)).

[0068] Test Example 1 (Viscosity Measurement) The viscosity of MUP1, MUP2, and Comparative MUP1 prepared in Production Example 1, Production Example 2, and Comparative Production Example 1 was measured using an Anton Paar rheometer (Modular Compact Rheometer MCR302). The viscosity measurement conditions were as follows: Rotor: No. CP50-0.5; Gap distance between rotor and sample surface: 0.2 mm; Measurement temperature: 25°C; Shear rate: 10⁷ (1 / s) The results are shown in Table 2.

[0069]

[0070] Manufacturing Examples 3 and 4 (Manufacturing of Insect Control Mats) 34.8 parts by mass of MUP (MUP1) from Manufacturing Example 1, after being stored at 90°C for 3 weeks, was mixed with an isoparaffinic solvent (Isopar M (manufactured by ExxonMobil)) to prepare 100 parts by volume to make Insect Control Mat Solution 1. In addition, Insect Control Mat Solution 2 was prepared by diluting Insect Control Mat Solution 1 twice with an isoparaffinic solvent (Isopar M (manufactured by ExxonMobil)). The prepared insecticide solution 1 or 2 for pest control mats was spread at a rate of 0.75 mL per blank mat material (made of pulp and cotton linters, 0.21 cm thick, 3.5 cm long side, 2.2 cm short side, mass 695 mg), yielding insect control mat 1 (production example 3) containing 100 mg of natural pyrethrin per mat, and insect control mat 2 (production example 4) containing 50 mg of natural pyrethrin per mat.

[0071] Test Example 2 (Efficacy Test of Pest Control Mat) Ten female adult Culex pipiens pallens mosquitoes were placed in a glass tube with a diameter of 4.5 cm and a height of 12 cm, and the openings at the top and bottom of the glass tube were covered with nylon netting to trap them. The same procedure was repeated to prepare two glass tubes containing 10 female adult Culex pipiens mosquitoes each. A metal cylinder with a diameter of 22 cm and a height of 83 cm was set upright. The two glass tubes containing the Culex pipiens mosquitoes were fixed vertically above the metal cylinder so that the lower end of the glass tubes was at the height of the upper opening of the metal cylinder. Pest control mat 1, which had been preheated for a predetermined period (no heating (0 hours), 11 hours), was set in the heated vaporization type insecticide device (heater temperature: 150°C) shown in Figure 2. The heated vaporization type insecticide device was placed at the bottom inside the metal cylinder, and the knockdown rate after 10 minutes was recorded. The same procedure was performed on pest control mat 2. The knockdown rate (hereinafter referred to as the KD rate) can be calculated using the following formula: KD rate (%) = (number of knocked-down insects / number of test insects) × 100. The results are shown in Table 3.

[0072] It has been confirmed that pest control mats prepared using MUP belonging to the present invention exhibit stable and excellent pest control effects even when heated for a long period of time.

[0073] Manufacturing Example 5 and Comparative Manufacturing Example 2 (Manufacturing of Heat-Dispersed Insecticide) Manufacturing Example 5 was prepared by mixing 1.98 parts by mass of MUP (MUP2) from Manufacturing Example 2 after storage at 90°C for 3 weeks, 15.0 parts by mass of diisopropyl adipate, and 83.0 parts by mass of isoparaffinic solvent (Isopar M (manufactured by ExxonMobil)). Comparative Heat-Dispersed Insecticide 1 (Comparative Manufacturing Example 2) was prepared by mixing 1.98 parts by mass of MUP (Comparative MUP1) from Comparative Manufacturing Example 1 after storage at 90°C for 3 weeks, 15.0 parts by mass of diisopropyl adipate, and 83.0 parts by mass of isoparaffinic solvent (Isopar M (manufactured by ExxonMobil)).

[0074] Test Example 3 (Efficacy Test of Heat-Vaporized Insecticide) Ten female adult Culex pipiens pallens mosquitoes were placed in a glass tube with a diameter of 4.5 cm and a height of 12 cm, and the openings at the top and bottom of the glass tube were covered with nylon netting to trap them. The same procedure was repeated to prepare two glass tubes containing 10 female adult Culex pipiens mosquitoes each. A metal cylinder with a diameter of 22 cm and a height of 83 cm was set upright. The two glass tubes were fixed vertically above the metal cylinder so that the lower end of the glass tubes containing the Culex pipiens mosquitoes was at the height of the upper opening of the metal cylinder. The heat-vaporized insecticide 1 (filled in a bottle and with a liquid-absorbing wick (made of ceramic (manufactured by Raushert, equivalent to 45% porosity))) which had been preheated for a predetermined period (4 hours, 92 hours) was set in the heat-vaporized insecticide device (heater temperature: 140°C) shown in Figure 1. The heat vaporization insecticide device was installed at the bottom inside a metal cylinder, and the knockdown (KD) rate was recorded after 5 minutes of being powered on (heating). The same procedure was performed for comparative heat vaporization insecticide formulation 1. The knockdown rate (hereinafter referred to as the KD rate) can be calculated using the following formula: KD rate (%) = (number of knocked-down insects / number of test insects) × 100. The results are shown in Table 4.

[0075] A heat-dispersing insecticide preparation prepared using MUP belonging to the present invention was confirmed to exhibit stable and excellent insecticide control effects even after prolonged heating. On the other hand, a comparative heat-dispersing insecticide preparation prepared using MUP not belonging to the present invention showed a decrease in efficacy. These results suggest that MUP belonging to the present invention can be used in the production of formulations that exhibit excellent efficacy even after long-term storage.

[0076] The present invention provides a composition and a method for controlling pests that have excellent pest control effects.

[0077] 1. Heat vaporization insecticide formulation 2. Heating element 3. Liquid absorption wick 4. Liquid solution bottle 10. Hot plate 11. Insecticide mat 12. Power switch 13. Housing

Claims

1. A composition comprising a natural pyrethrin, a radical chain inhibitor, a peroxide decomposer, and a solvent, wherein the ratio (V2 / V1) of the viscosity V2 (mPa·s) after storage at 90°C for 3 weeks to the initial viscosity V1 (mPa·s) of the composition is 1 to 5.

2. The composition according to claim 1, wherein the viscosity V1 of the initial composition is in the range of 2 to 40 mPa·s.

3. The composition according to claim 1, wherein the content of natural pyrethrins is in the range of 10 to 75% by mass.

4. The composition according to claim 1, wherein the radical chain inhibitor comprises at least one selected from the group consisting of dibutylhydroxytoluene and butylhydroxyanisole.

5. The composition according to claim 1, wherein the peroxide decomposing agent comprises at least one selected from the group consisting of triphenyl phosphite, tetraphenyldipropylene glycol diphosphite, diphenyl mono(2-ethylhexyl) phosphite, di-n-decylphenyl phosphite, 4,4'-butylidenebis(3-methyl-6-t-butylphenyl ditridecyl phosphite), 2-tert-butyl-6-methyl-4-{3-[(2,4,8,10-tetra-tert-butyldibenzo[d,f][1,3,2]dioxaphosphine-6-yl)oxy]propyl}phenol, tetra(C12-15 alkyl)-4,4'-isopropylidenediphenyl diphosphite, and triisodecyl phosphite.

6. The composition according to claim 1, wherein the peroxide decomposing agent comprises at least one selected from the group consisting of triphenyl phosphite and 4,4'-butylidenebis(3-methyl-6-t-butylphenyl ditridecyl phosphite).

7. The composition according to claim 1, wherein the mass ratio of the radical chain inhibitor to the peroxide decomposition agent is 1:0.017 to 1:7.

5.

8. A heat-evaporative insecticide comprising the composition according to any one of claims 1 to 7 and a solvent for dilution.

9. A heat vaporization type insecticide device comprising a liquid medicine bottle filled with the heat vaporization insecticide formulation described in claim 8, a liquid absorption wick, and a heating element.

10. A method for controlling pests, comprising the step of vaporizing natural pyrethrins into space using the heat vaporization insecticide device described in claim 9.

11. A pest control mat comprising the composition according to any one of claims 1 to 7 and a solid carrier.

12. A method for controlling pests, comprising the step of heating the pest control mat described in claim 11 to vaporize natural pyrethrins into the air.

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