Pest control composition and method for suppressing adsorption to packaging material

Abstract

To provide a pest control composition capable of suppressing adsorption on a linear low density polyethylene in which a specific pyrethroid compound that is an effective ingredient of a pest control composition is the most-inner layer of a packaging material, thereby capable of suppressing decrease of a quantity of an effective component.SOLUTION: There is provided a pest control composition containing a pyrethroid compound with a phenoxybenzyl group, a water-soluble polymer compound, and water, which is filled in a packaging material made of linear low-density polyethylene as the innermost layer. The method includes adding a water-soluble polymer compound to a pest control composition containing a pyrethroid compound with a phenoxybenzyl group and water, to suppress the adsorption of the pyrethroid compound with a phenoxybenzyl group to the packaging material made of linear low-density polyethylene.SELECTED DRAWING: None

Description

Technical Field

[0001] The present invention relates to a pest control composition and a method for suppressing adsorption to a packaging material.

Background Art

[0002] Conventionally, in ordinary households, in order to control or prevent pests, a hand spray has been used in which a pest control composition is contained in a spray-type bottle container for easy use. For example, Patent Document 1 describes that an aqueous insecticide preparation containing an insecticidal component such as an organophosphorus-based compound and a surfactant was sprayed with a hand spray to control the larvae of the rice leaf beetle.

[0003] On the other hand, for the purpose of reducing the environmental load by reusing the container, the bottle container is reused and only the contents are refilled and used, so that sales in the form of so-called standing pouches have been widely carried out. Standing pouches are required to be easily foldable after use and to be easily disposed of without taking up much space. Therefore, a packaging material that is flexible and thinner than a bottle container is often used.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] When accommodating a pest control composition in the standing pouch as described above, depending on the thickness and material of the packaging material, etc., the concentration of the active ingredient in the pest control composition may decrease, and the desired effect may not be obtained. The present inventors have found that in a pest control composition containing a specific pyrethroid compound as an active ingredient, when a packaging material having a linear low-density polyethylene as the innermost layer is used, there is a problem that the pyrethroid compound is adsorbed to the innermost layer, and the concentration of the pyrethroid compound in the pest control composition decreases.

[0006] The present invention has been made to solve the above problems, and suppresses adsorption of a specific pyrethroid compound, which is an active ingredient of a pest control composition, to linear low-density polyethylene, which is the innermost layer of a packaging material, and suppresses a decrease in the concentration of the pyrethroid compound in the pest control composition. An object of the present invention is to provide a pest control composition and a method for suppressing adsorption of a specific pyrethroid compound to a packaging material.

Means for Solving the Problems

[0007] That is, the present invention relates to the following. [1] A pest control composition containing a pyrethroid compound having a phenoxybenzyl group, a water-soluble polymer compound, and water, which is filled in a packaging material having a linear low-density polyethylene as the innermost layer. A pest control composition filled in a packaging material having a linear low-density polyethylene as the innermost layer. [2] The pest control composition according to [1], further containing a solvent having a LogKow of 2 or more. [3] The pest control composition according to [1] or [2], wherein the water-soluble polymer compound is at least one selected from polyvinyl-based polymer compounds, cellulose-based polymer compounds, polyacrylic-based polymer compounds, naphthalene sulfonic acid condensates, polyalkylene oxides, and thickening polysaccharides. [4] Adding a water-soluble polymer compound to a pest control composition containing a pyrethroid compound having a phenoxybenzyl group and water. A method for suppressing the adsorption of a pyrethroid compound having a phenoxybenzyl group to a packaging material whose innermost layer is made of linear low-density polyethylene.

Advantages of the Invention

[0008] According to the pest control composition of the present invention and the method for suppressing adsorption to a packaging material, adsorption of a specific pyrethroid compound, which is an active ingredient of the pest control composition, to linear low-density polyethylene, which is the innermost layer of the packaging material, can be suppressed, and thereby a decrease in the concentration of the pyrethroid compound in the pest control composition can be suppressed.

Embodiments for Carrying Out the Invention

[0009] Hereinafter, the pest control composition according to the present invention and the method for suppressing adsorption to a packaging material will be described based on embodiments, but the present invention is not limited to these embodiments. Unless otherwise specified, the symbol "~" represents a numerical range including the numbers before and after.

[0010] The pest control composition of the present embodiment contains (A) a pyrethroid compound having a phenoxybenzyl group, (B) a water-soluble polymer compound, and water, and is characterized by being filled in a packaging material whose innermost layer is made of linear low-density polyethylene.

[0011] And the pest control composition of the present embodiment contains (B) a water-soluble polymer compound, thereby effectively suppressing the adsorption of (A) a pyrethroid compound having a phenoxybenzyl group to linear low-density polyethylene, which is the innermost layer of the packaging material.

[0012] 〔(A) Pyrethroid Compound Having a Phenoxybenzyl Group〕 In the pest control composition of the present embodiment, the (A) pyrethroid compound having a phenoxybenzyl group (hereinafter also referred to as the (A) active ingredient) acts as an active ingredient of the pest control composition and is a component that exhibits a controlling and / or repellent effect against pests.

[0013] The phenoxybenzyl group of this embodiment includes a phenoxybenzyl group and a phenoxybenzyl group in which a part of the hydrogen atoms thereof is substituted. The phenoxybenzyl group is usually a 3-phenoxybenzyl group represented by the following structural formula (a) and a group in which a part of the hydrogen atoms of the structural formula (a) is substituted. In the structural formula (a), R1 is a hydrogen atom or a fluorine atom, and R2 is a hydrogen atom or a cyano group.

[0014] [Chemical formula]

[0015] In the pest control composition of this embodiment, examples of the (A) pyrethroid compound having a phenoxybenzyl group (hereinafter also simply referred to as the "(A) pyrethroid compound") include phenothrin, cyphenothrin, permethrin, cypermethrin, cyfluthrin, fenpropathrin, tralomethrin, deltamethrin, etofenprox, silafluofen, etc., and etofenprox, permethrin, fenpropathrin, cyfluthrin, phenothrin are particularly preferred.

[0016] These pyrethroid compounds can use commercially available products or synthetic products by known methods. In the acid part or alcohol part of the pyrethroid compound, when there are optical isomers or geometric isomers based on asymmetric carbon, each of them or any mixture is also included in this embodiment. The (A) pyrethroid compound may be used alone or in combination of two or more.

[0017] In the pest control composition of this embodiment, the content of the (A) pyrethroid compound is preferably 0.001 to 10% by mass, more preferably 0.003 to 5% by mass, and even more preferably 0.005 to 3% by mass based on the total amount of the pest control composition.

[0018] [(B) Water-soluble polymer compound] In the pest control composition of the present embodiment, the (B) water-soluble polymer compound is a component that suppresses the adsorption of the (A) pyrethroid compound to a predetermined material constituting the packaging material. As the (B) water-soluble polymer compound, in one aspect, it is preferably at least one selected from polyvinyl-based polymer compounds, cellulose-based polymer compounds, polyacrylic-based polymer compounds, naphthalene sulfonic acid condensates, polyalkylene oxides, and thickening polysaccharides. The (B) water-soluble polymer compound may be used alone or in combination of two or more.

[0019] Examples of the polyvinyl-based polymer compound include polyvinyl alcohol, polyvinyl pyrrolidone, carboxyvinyl polymer, polyvinyl methyl ether, and the like.

[0020] In the pest control composition of the present embodiment, when polyvinyl alcohol is used as the polyvinyl-based polymer, the saponification degree of polyvinyl alcohol is preferably 70% or more in terms of molar percentage. By setting the saponification degree of polyvinyl alcohol within the above range, while maintaining good handleability of the pest control composition, the adsorption of the active ingredient to the innermost layer of the packaging material can be further suppressed.

[0021] In the pest control composition of the present embodiment, when polyvinyl alcohol is used as the polyvinyl-based polymer, the degree of polymerization of polyvinyl alcohol is preferably 50 or more, more preferably 100 or more. Further, the degree of polymerization is preferably 30000 or less, more preferably 20000 or less. By setting the degree of polymerization of polyvinyl alcohol within the above range, while maintaining good handleability of the pest control composition, the adsorption of the active ingredient to the innermost layer of the packaging material can be further suppressed.

[0022] In the pest control composition of the present embodiment, when polyvinylpyrrolidone is used as the polyvinyl-based polymer, the K value of polyvinylpyrrolidone is preferably 10 or more, more preferably 15 or more, and still more preferably 20 or more. Also, the K value is preferably 120 or less, more preferably 110 or less, and still more preferably 100 or less. By setting the K value of polyvinylpyrrolidone within the above range, it is possible to further suppress the adsorption of the active ingredient to the innermost layer of the packaging material while maintaining good handleability of the pest control composition.

[0023] The K value is a viscosity characteristic value correlated with the molecular weight, and is a value calculated by applying the relative viscosity value (25 ° C) measured with a capillary viscometer to the following Fikentscher's formula. K=(1.5logη rel -1) / (0.15+0.003c)+(300clogη rel +(c+1.5clogη rel ) 2 ) 1 / 2 / (0.15c+0.003c 2 ) η rel : Relative viscosity of the polyvinylpyrrolidone aqueous solution with respect to water c: Concentration of polyvinylpyrrolidone in the polyvinylpyrrolidone aqueous solution (%)

[0024] The cellulose-based polymer compound is cellulose or a compound in which a hydroxy group of cellulose is replaced with another functional group. Examples of the cellulose-based polymer compound include methylcellulose, ethylcellulose, hydroxyethylcellulose, hydroxymethylcellulose, hydroxypropylcellulose, hydroxypropylmethylcellulose, hydrophobized hydroxypropylmethylcellulose, carboxymethylcellulose, carboxyethylcellulose, or salts thereof.

[0025] The weight-average molecular weight of the cellulose-based polymer compound is preferably 5000 or more, more preferably 10000 or more, and still more preferably 30000 or more. Further, the weight-average molecular weight of the cellulose-based polymer compound is preferably 5000000 or less, more preferably 4000000 or less, and still more preferably 3000000 or less.

[0026] Examples of the polyacrylic polymer compound include polyacrylic acid, sodium polyacrylate, ammonium polyacrylate, polyacrylamide, and the like.

[0027] Examples of the naphthalene sulfonic acid condensate include naphthalene sulfonic acid formalin condensate or its salt, alkyl naphthalene sulfonic acid formalin condensate or its salt, and the like.

[0028] Examples of the polyalkylene oxide include polyethylene oxide, polypropylene oxide, and polybutylene oxide.

[0029] The viscosity-average molecular weight of the polyalkylene oxide is preferably 30000 or more, more preferably 50000 or more, and still more preferably 100000 or more. Further, the viscosity-average molecular weight of the polyalkylene oxide is preferably 10000000 or less, more preferably 8000000 or less, and still more preferably 6000000 or less.

[0030] Examples of the thickening polysaccharide include gellan gum, guar gum, carrageenan, xanthan gum, gum arabic, pectin, mucopolysaccharide, alginic acid or its salt.

[0031] In the pest control composition of the present embodiment, the content of the (B) water-soluble polymer compound (total content of the water-soluble polymer compound) is preferably 0.0001% by mass or more, more preferably 0.001% by mass or more, still more preferably 0.01% by mass or more, based on the total amount of the pest control composition. By setting the content of the (B) water-soluble polymer compound to 0.0001% by mass or more, an excellent adsorption suppression effect can be exhibited. The content of the (B) water-soluble polymer compound in the pest control composition of the present embodiment is preferably 9% by mass or less, more preferably 5% by mass or less, still more preferably 3% by mass or less, particularly preferably 1% by mass or less, and most preferably 0.6% by mass or less, based on the total amount of the pest control composition. By setting the content of the (B) water-soluble polymer compound to 9% by mass or less, the adsorption of the active ingredient to the innermost layer of the packaging material can be further suppressed while maintaining good handleability of the pest control composition.

[0032] In the pest control composition of the present embodiment, the ratio (mass ratio) [(B) / (A)] of the content of the (B) water-soluble polymer compound to the content of the (A) pyrethroid compound is preferably 0.001 or more and 5000 or less, more preferably 0.01 or more and 3000 or less, still more preferably 0.1 or more and 1000 or less, from the viewpoint of further enhancing the adsorption suppression effect of the active ingredient to the innermost layer of the packaging material.

[0033] In the pest control composition of the present embodiment, regarding the mechanism by which the (B) water-soluble polymer compound suppresses the adsorption to linear low-density polyethylene, for the (A) pyrethroid compound emulsified or solubilized in the pest control composition, it is presumed that the (B) water-soluble polymer compound contributes to the improvement or stabilization of the emulsifying or solubilizing ability, or the (B) water-soluble polymer compound forms a polymer network structure and exhibits an effect such as suppressing the movement of the (A) pyrethroid compound, thereby exerting an adsorption suppression effect.

[0034] [(C) Solvent] The pest control composition of this embodiment preferably further contains (C) a solvent. The (C) solvent is a component that improves the dispersibility of the (A) pyrethroid compound in the pest control composition and prevents the precipitation of the (A) pyrethroid compound. In the pest control composition of this embodiment, water is not included in the (C) solvent. The (C) solvent may be used alone or in combination of two or more.

[0035] In one aspect, the pest control composition of this embodiment preferably further contains a solvent with a LogKow of 2 or more as the (C) solvent. The LogKow of the solvent is more preferably 2.5 or more, and even more preferably 2.8 or more. The larger the LogKow of the solvent, the higher the affinity for the organic solvent and the higher the lipophilicity, so the adsorption suppression effect can be enhanced more.

[0036] Note that LogKow is a scale representing the logarithmic values of the substance concentration in 1-octanol and the substance concentration in water when a substance is added to two solvent phases of 1-octanol and water and reaches an equilibrium state, and is defined as in the following formula (2). LogKow = log([Mo] / [Mw]) …(2) [In formula (2), [Mo] is the number of moles of the substance in the 1-octanol phase, and [Mw] is the number of moles of the substance in the water phase.]

[0037] In the present invention, the measurement of LogKow is calculated as an estimated value using "EPI Suite v4.11" published by the US Environmental Protection Agency.

[0038] Examples of solvents with a LogKow of 2 or more include the following. · 2-Heptanol (LogKow: 2.24) · 1-Octanol (LogKow: 2.81) · 1-Decanol (LogKow: 3.79) · Normal paraffin (C11~15) (LogKow: 5.74) · Isopropyl myristate (LogKow: 7.17) · Xylene (LogKow: 3.09) · Ethylbenzene (LogKow: 3.03) · Anisole (LogKow: 2.07) · Dialkyl (C 10 ~C 13 ) phthalate (LogKow: 11.37) · Toluene (LogKow: 2.54)

[0039] The pest control composition of this embodiment can further suppress the adsorption of the active ingredient to the innermost layer of the packaging material by containing a solvent having a LogKow of 2 or more as the (C) solvent. It is presumed that the solvent having a LogKow of 2 or more interacts with both the (A) pyrethroid compound and the (B) water-soluble polymer compound, and enhances the effect of the (B) water-soluble polymer compound, thereby exerting an adsorption suppression effect.

[0040] In the pest control composition of this embodiment, the content of the (C) solvent is preferably 0.01% by mass or more, more preferably 0.1% by mass or more, and still more preferably 0.2% by mass or more, based on the total amount of the pest control composition. Also, the content of the (C) solvent is preferably 10% by mass or less, more preferably 7% by mass or less, and still more preferably 5% by mass or less, based on the total amount of the pest control composition. By setting the content of the (C) solvent within the above range, an excellent adsorption suppression effect can be exerted.

[0041] In the pest control composition of this embodiment, the ratio (mass ratio) [(C) / (B)] of the content of the (C) solvent to the content of the (B) water-soluble polymer compound is preferably 0.001 or more and 10000 or less, more preferably 0.005 or more and 5000 or less, and still more preferably 0.01 or more and 1000 or less, from the viewpoint of further enhancing the adsorption suppression effect of the active ingredient to the innermost layer of the packaging material.

[0042] 〔Other components〕 The pest control composition of this embodiment may further contain other components in addition to (A) a pyrethroid compound, (B) a water-soluble polymer compound, (C) a solvent, and water. Examples of other components include, for example, pest control components other than pyrethroid compounds having a phenoxybenzyl group, fungicides, acaricides, herbicides, plant growth regulators, pH adjusters, spreading agents, and the like.

[0043] Examples of pest control components other than pyrethroid compounds having a phenoxybenzyl group include, for example, pyrethroid compounds having no phenoxybenzyl group, neonicotinoid compounds, carbamate compounds, organophosphorus compounds, oxadiazole compounds, and phenylpyrazole compounds. Examples of pyrethroid compounds having no phenoxybenzyl group include, for example, imiprothrin, resmethrin, transfluthrin, metofluthrin, profuthrin, terallethrin, flumethrin, monofluorothrin, dimefluthrin, meperfluthrin, heptafluthrin, allethrin, phthalthrin, prallethrin, natural pyrethrin (a mixture of pyrethrin I, pyrethrin II, cinerin I, cinerin II, jasmolin I, and jasmolin II), and the like. Examples of neonicotinoid compounds include, for example, dinotefuran, imidacloprid, acetamiprid, clothianidin, and the like. Examples of carbamate compounds include, for example, propoxur, carbaryl, and the like. Examples of organophosphorus compounds include, for example, fenitrothion, DDVP, and the like. Examples of oxadiazole compounds include, for example, methoxadiazone, and the like. Examples of phenylpyrazole compounds include, for example, fipronil, and the like.

[0044] Examples of fungicides include, for example, sulfur-based dithane, maneb, benzimidazole-based benomyl, dicarboximide-based vinclozolin, iprodione, procymidone, triazine, triflumizole, metalaxyl, penthiopyrad, organic copper, cupric hydroxide, antibiotic-based fungicides (for example, streptomycin-based, tetracycline-based, polyoxin-based, nucleoside-based, kasugamycin-based, validamycin-based), and the like.

[0045] Examples of acaricides include, for example, milbemectin, CPCBS, fenisobromolate, hexythiazox, tetradifon, phenothiocarb, fenpyroximate, amitraz, and the like.

[0046] Examples of herbicides include, for example, acid amide-based stam, urea-based DCMU, linuron, bipyridinium-based paraquat, diquat, diazin-based bromacil, S-triazine-based simazine, simetryn, nitrile-based DBN, dinitroaniline-based trifluralin, carbamate-based benthiocarb, MCC, diphenyl ether-based NIP, phenol-based PCP, benzoic acid-based MDBA, phenoxy-based sodium 2,4-D, mapica, mecoprop or its salts, mecoprop P or its salts, amino acid-based glyphosate, bilanafos, glufosinate, aliphatic-based sodium TCA, and the like.

[0047] Examples of plant growth regulators include, for example, indolebutyric acid, ethephon, benzylaminopurine, forchlorfenuron, gibberellin, decyl alcohol, ethephon, and the like.

[0048] The pH adjuster is a component that adjusts the pH of the pest control composition to an appropriate range. Examples of pH adjusters include, for example, citric acid, sodium citrate, sodium hydrogen carbonate, triethanolamine, ammonia, potassium hydroxide, sodium hydroxide, and the like.

[0049] The spreading agent is a component that enhances the spreading properties of each component in the pest control composition on plants and insect bodies. Examples of spreading agents include glycerin fatty acid esters, polyglycerin fatty acid esters, sorbitan fatty acid esters, polyoxyethylene sorbitan fatty acid esters, polyoxyethylene fatty acid esters, sucrose fatty acid esters, propylene glycol fatty acid esters, polyethylene glycol fatty acid esters, lecithin, polyoxyethylene alkyl ethers, polyoxyethylene alkyl phenyl ethers, polyoxyethylene castor oil, polyoxyethylene hydrogenated castor oil, modified silicone oil, and the like.

[0050] 〔Viscosity〕 The viscosity of the pest control composition of the present embodiment at 20°C is preferably 0.5 mPa·s or more, more preferably 1 mPa·s or more, and even more preferably 1.3 mPa·s or more. The viscosity is preferably 50 mPa·s or less, more preferably 30 mPa·s or less, and even more preferably 10 mPa·s or less. When the viscosity of the pest control composition is 0.5 mPa·s or more, the adsorption inhibitory effect of the active ingredient on the innermost layer of the packaging material made of linear low-density polyethylene can be enhanced. When the viscosity of the pest control composition is 50 mPa·s or less, the viscosity does not become too high, and good handleability can be maintained. The viscosity of the pest control composition is a value measured with a tuning fork vibration type viscometer. When measuring, the natural vibration frequency of the detector of the tuning fork vibration type viscometer is set to 30 Hz, and the liquid temperature is set to any temperature between 18 and 22°C.

[0051] In one aspect, the viscosity of the pest control composition of the present embodiment can be adjusted by the content of the (B) water-soluble polymer compound, the degree of polymerization of the (B) water-soluble polymer compound, the degree of saponification and the degree of polymerization when the polyvinyl-based polymer compound contained as the (B) water-soluble polymer compound is polyvinyl alcohol, the K value when the polyvinyl-based polymer compound contained as the (B) water-soluble polymer compound is polyvinylpyrrolidone, the degree of etherification of the cellulose-based polymer contained as the (B) water-soluble polymer compound, and the like.

[0052] 〔Method for producing pest control composition〕 The pest control composition of this embodiment can be obtained by mixing the (A) pyrethroid compound, the (B) water-soluble polymer compound, and, if necessary, the (C) solvent and water. The method for producing the pest control composition of this embodiment is not particularly limited, but preferably includes the following steps x1) to x4).

[0053] x1) First, add the (B) water-soluble polymer compound to water (purified water), and stir while heating if necessary to dissolve it. The temperature of the mixture of water and the (B) water-soluble polymer compound at this time is, for example, 70°C or higher and 95°C or lower. When using the (C) solvent, after cooling the heated mixture of water and the (B) water-soluble polymer compound, add the (C) solvent and stir. In order to uniformly mix the mixture after adding the (C) solvent, it is preferable to use a high-speed emulsifying and dispersing machine for mixing. The rotation speed and stirring time in this case are, for example, preferably 500 rpm or higher and 5000 rpm or lower, and preferably about 15 minutes or longer and 60 minutes or shorter. x2) Separately from the (B) water-soluble polymer compound and the (C) solvent, the (A) pyrethroid compound is mixed and stirred with water (purified water) to obtain a dispersion. x3) While stirring, add the mixture containing water, the (B) water-soluble polymer compound, and, if necessary, the (C) solvent obtained in x1) to the dispersion obtained in x2) to obtain a pest control composition. x4) Fill the pest control composition obtained in x3) into a packaging material whose innermost layer is made of linear low-density polyethylene.

[0054] 〔Packaging Material〕 The packaging material in this embodiment has an innermost layer made of linear low-density polyethylene. Linear low-density polyethylene has a higher adsorbability of the (A) pyrethroid compound than high-density polyethylene, and the effects of the present invention can be obtained significantly. The packaging material may have an outermost layer and an intermediate layer between the innermost layer and the outermost layer in addition to the innermost layer made of linear low-density polyethylene.

[0055] Linear low-density polyethylene is a polyethylene with a substantially linear molecular structure without long-chain branching, and is a copolymer obtained by copolymerizing ethylene as the main component with a small amount of α-olefin. Linear low-density polyethylene has a density preferably of 3 850 kg / m 3 or more and 940 kg / m 3 or less, more preferably 900 kg / m 3 or more and 925 kg / m

[0056] The outermost layer of the packaging material is made of, for example, resins such as polyethylene terephthalate, linear low-density polyethylene (LLDPE), polyethylene, nylon, etc., those obtained by vapor-depositing a metal such as aluminum or a metal oxide such as aluminum oxide or an inorganic oxide such as silicon oxide on the resin, paper, etc. The intermediate layer may be a single layer or laminated, and is preferably composed of at least one selected from layers made of resins such as polyethylene terephthalate, linear low-density polyethylene (LLDPE), polyethylene, polypropylene, ethylene-propylene copolymer, nylon, etc., layers obtained by vapor-depositing a metal such as aluminum or a metal oxide such as aluminum oxide or an inorganic oxide such as silicon oxide on the resin, layers made of a metal such as aluminum foil, and layers made of paper, etc.

[0057] The packaging material of this embodiment is preferably a standing pouch having a spout portion protruding obliquely upward from the shoulder of the container. According to this standing pouch, by pinching the spout portion with a finger and tearing it along a linear groove that obliquely crosses the entire width of the spout portion, the spout portion can be easily opened to form a spout, and it is possible to easily refill a bottle-type spray container. The spout portion may have a spout (inlet) whose two parts can be detached by a screw or the like. Also, the standing pouch preferably has a bottom surface, whereby the standing pouch can be stably self-standing.

[0058] In addition, the packaging material of this embodiment has a spout (inlet) to which a lid can be attached or detached with a screw or the like, and similar to the case of using a conventional bottle-type spray container, the spout (inlet) and a trigger-type spray gun can be connected and used as a spray container for spraying a pest control composition.

[0059] 〔Adsorption rate〕 The pest control composition of this embodiment preferably has an adsorption rate represented by the following formula (3) of 30% or less, more preferably 20% or less, and even more preferably 15% or less when contained in a packaging material whose innermost layer is made of linear low-density polyethylene. Adsorption rate (%) = [1 - {concentration of (A) pyrethroid compound after standing for 10 days / initial concentration of (A) pyrethroid compound}] × 100 …(3)

[0060] In the above formula (3), the "concentration of (A) pyrethroid compound after standing for 10 days" is the concentration of the (A) pyrethroid compound contained in the pest control composition in the packaging material after the pest control composition of the embodiment is contained in a packaging material whose innermost layer is made of linear low-density polyethylene and allowed to stand at 50°C for 10 days.

[0061] In the above formula (3), the "initial concentration of (A) pyrethroid compound" is the concentration of the (A) pyrethroid compound immediately after the pest control composition of the embodiment is contained in a packaging material whose innermost layer is made of linear low-density polyethylene, and is the concentration of the (A) pyrethroid compound contained in the pest control composition before being contained in the packaging material.

[0062] 〔Adsorption inhibition rate〕 The pest control composition of this embodiment preferably has an adsorption inhibition rate represented by the following formula (4) of 30% or more, more preferably 40% or more, and even more preferably 50% or more when contained in a packaging material whose innermost layer is made of linear low-density polyethylene. Adsorption inhibition rate (%) = [1 - {adsorption rate (%) when containing a water-soluble polymer compound / adsorption rate (%) when not containing a water-soluble polymer compound}] × 100 …(4)

[0063] In the above formula (4), the "adsorption rate when containing a water-soluble polymer compound" is the adsorption rate determined by formula (3) after the pest control composition of the embodiment is stored in a packaging material whose innermost layer is made of linear low-density polyethylene and left standing at 50 °C for 10 days.

[0064] In the above formula (4), the "adsorption rate when not containing a water-soluble polymer compound" is the adsorption rate determined by formula (3) when the pest control composition of the embodiment used to determine the "adsorption rate when containing a water-soluble polymer compound" is replaced with a pest control composition having the same formulation except for not containing a water-soluble polymer compound.

[0065] 〔Method for suppressing adsorption to packaging material〕 The method of this embodiment is a method for suppressing the adsorption of (A) pyrethroid compounds to a packaging material whose innermost layer is made of linear low-density polyethylene, and is characterized by including adding (B) a water-soluble polymer compound to a pest control composition containing (A) a pyrethroid compound and water.

[0066] Specifically, the method of this embodiment preferably includes the following steps y1) and y2). y1) Add (B) a water-soluble polymer compound to a pest control composition containing (A) a pyrethroid compound and water to prepare a pest control composition. y2) Fill the pest control composition prepared in y1) into a packaging material whose innermost layer is made of linear low-density polyethylene.

[0067] According to the method of this embodiment, in particular, although the (A) pyrethroid compound having a phenoxybenzyl group can increase the adsorptivity to linear low-density polyethylene, by adding (B) a water-soluble polymer compound to the pest control composition, an excellent adsorption suppressing effect of the active ingredient on a packaging material whose innermost layer is made of linear low-density polyethylene can be achieved.

Example

[0068] Next, examples will be described. The present invention is not limited to the following examples.

[0069] The reagents (trade names) used in the test examples and their manufacturing company names are as follows. Ethofenprox Premix: Trebon (registered trademark) emulsion [Mitsui Chemicals Crop & Life Solutions, Inc.] Fenpropathrin Premix: Rodeo (registered trademark) emulsion [Sumitomo Chemical Co., Ltd.] Permethrin Premix: Adion (registered trademark) emulsion [Sumitomo Chemical Co., Ltd.] Phenothrin Premix: Kintoki Sumithrin (registered trademark) emulsion [Dainippon Jochugiku Co., Ltd.] Cyfluthrin Premix: Kansho Baisroid (registered trademark) EW [Agro Kanesho Co., Ltd.] Phthalothrin Premix: Kintoki SNP emulsion A [Dainippon Jochugiku Co., Ltd.] Partially saponified polyvinyl alcohol: Gosenol (registered trademark) KL-05 [Mitsubishi Chemical Corporation] Sodium carboxymethyl cellulose: CMC Daicel 1120 [Daicel Miraiz Co., Ltd.] Hydroxyethyl cellulose: HEC Daicel SP200 [Daicel Miraiz Co., Ltd.] Hydroxypropyl methylcellulose: Methocel (registered trademark) 60SH-50 [Shin-Etsu Chemical Co., Ltd.] Polyvinylpyrrolidone: PVP K-90 [Nippon Catalyst Co., Ltd.] Carboxyvinyl polymer: AQUPEC HV-801EG [Sumitomo Seika Chemicals Co., Ltd.] Xanthan gum: Neosoft XC [Taiyo Kagaku Co., Ltd.] Gellan gum: Neosoft J [Taiyo Kagaku Co., Ltd.] Carrageenan: Sankara No. 1057 [Taiyo Kagaku Co., Ltd.] Polyacrylic acid: 25% aqueous polyacrylic acid solution [FUJIFILM Wako Pure Chemical Corporation] Sodium polyacrylate: Aron (registered trademark) T-50 [Toagosei Co., Ltd.] Ammonium polyacrylate: Aron (registered trademark) A-30SL [Toagosei Co., Ltd.] Polyacrylamide: Soragum (registered trademark) SH210 [SEPPIC S.A.] Sodium salt of β-naphthalenesulfonic acid formalin condensate: Demol (registered trademark) N [Kao Corporation] Polyethylene oxide: PEO1 [Sumitomo Seika Chemicals Co., Ltd.] Dialkyl (C 10 ~C 13 ) phthalate: Vinizer (registered trademark) 124N (LogKow: 11.37) [Kao Corporation] Isopropyl myristate: IPM-S (LogKow: 7.17) [Mitsubishi Chemical Industries, Ltd.] Normal paraffin: Normal paraffin MA (LogKow: 5.74) [ENEOS Corporation] 1-Decanol: 1-Decanol (LogKow: 3.79) [Tokyo Chemical Industry Co., Ltd.] 1-Octanol: 1-Octanol (LogKow: 2.81) [Tokyo Chemical Industry Co., Ltd.] 2-Heptanol: 2-Heptanol (LogKow: 2.24) [Tokyo Chemical Industry Co., Ltd.] Anisole: Anisole (LogKow: 2.07) [Tokyo Chemical Industry Co., Ltd.]

[0070] [Test Example 1] Preparation and Evaluation of Pest Control Composition Specimens (Preparation of Pest Control Composition Specimens) Using each component shown in Table 1 in the amounts shown in Table 1, specimens of pest control compositions for Examples and Comparative Examples were prepared as follows. First, partially saponified polyvinyl alcohol [Gosenol (registered trademark) KL-05, manufactured by Mitsubishi Chemical Corporation, saponification degree: 78.5 - 82.0, degree of polymerization: 500] as (B) water-soluble polymer compound was added to purified water and stirred to dissolve. During this stirring, heating was performed to 90 °C as necessary. Next, after bringing the mixture of water and (B) water-soluble polymer compound to 40 °C or lower, dialkyl (C 10 ~C 13Phthalate [Vinizer (registered trademark) 124N, manufactured by Kao Corporation] was added and stirred using a high-speed emulsifying and dispersing machine [T.K. Robomix f model, manufactured by Tokushu Kika Kogyo Co., Ltd.]. The rotational speed and stirring time at this time were 4500 rpm for 40 minutes. Separately from (B) the water-soluble polymer compound and (C) the solvent, (A) the pyrethroid compound was mixed with purified water and stirred to obtain a dispersion.

[0071] (A) As the pyrethroid compound, 0.1% by mass of Trebon (registered trademark) emulsion [manufactured by Mitsui Chemicals Crop & Life Solutions, Inc.] was blended so as to have the blending amount of etofenprox shown in Table 1. To the obtained dispersion of (A) the pyrethroid compound, a mixture containing water, (B) the water-soluble polymer compound, and (C) the solvent, and other components were added while stirring to make a total of 100% by mass, and specimens of the pest control compositions of each example were obtained.

[0072] (Evaluation of adsorption rate) Using the specimens of the pest control compositions of each example obtained above, the adsorption rate was evaluated as follows. By high-performance liquid chromatography (HPLC), the concentration of etofenprox (the concentration of the initial (A) pyrethroid compound) in the specimen of each example was quantified. Next, 850 mL of the specimen was filled into a packaging material and sealed, and then left standing at 50°C for 10 days. After 10 days had passed, the specimen was collected from the packaging material, and the concentration of etofenprox (the concentration of the (A) pyrethroid compound after standing for 10 days) in the specimen was quantified by HPLC.

[0073] From the following formula (3), the adsorption rate of the (A) pyrethroid compound was calculated. The results are shown in Table 1. Adsorption rate (%) = [1 - {concentration of (A) pyrethroid compound after standing for 10 days / concentration of initial (A) pyrethroid compound}] × 100 …(3)

[0074] The packaging material used for evaluating the adsorption rate was a standing pouch with a full capacity of 1400 mL. The structure of the standing pouch was such that the innermost layer was a linear low-density polyethylene layer (LLDPE, thickness 120 μm), and as intermediate layers, from the inside, it had a nylon layer (NY, thickness 15 μm) and an aluminum foil (AL, thickness 7 μm), and the outermost layer was a polyethylene terephthalate layer (PET, thickness 12 μm). The dimensions of the standing pouch were width 180 mm × height 255 mm × bottom folding reciprocation 100 mm.

[0075] Also, the adsorption inhibition rate was calculated from the following formula (4). Adsorption inhibition rate (%) = [1 - {adsorption rate (%) when containing a water-soluble polymer compound / adsorption rate (%) when not containing a water-soluble polymer compound}] × 100 …(4)

[0076]

Table 1

[0077] As shown in Table 1, in Examples 1-1 to 1-9, the adsorption rate of etofenprox was lower than that in Comparative Example 1-1, and it was found that etofenprox [(A) pyrethroid compound], which is the active ingredient of the pest control composition, was suppressed from being adsorbed by the linear low-density polyethylene that is the innermost layer of the standing pouch container, and the decrease in the amount of the active ingredient could be effectively suppressed.

[0078] Also, from the results of Examples 1-3 and 1-5 to 1-9, the effect of enhancing the adsorption inhibition of the active ingredient by including dialkyl (C 10 ~C 13 ) phthalate, which is a solvent with a LogKow of 2 or more as the solvent (C) in the pest control composition, reaches its upper limit when the content of dialkyl (C 10 ~C 13 ) phthalate is around 0.5 mass%.

[0079] [Test Example 2] Examination of the active ingredient (A) The adsorption inhibition effect was examined when the type of pyrethroid compound was changed. Each component shown in Table 2 was used in the amounts shown in each table, and each specimen of the pest control compositions of the examples and comparative examples was prepared in the same manner as in Test Example 1, and the adsorption rate and adsorption inhibition rate were evaluated. As the (A) pyrethroid compound, in order to obtain the blending amounts shown in Table 2, for fenpropathrin, Rodeo (registered trademark) emulsion [manufactured by Sumitomo Chemical Co., Ltd.], for permethrin, Adion (registered trademark) emulsion [manufactured by Sumitomo Chemical Co., Ltd.], for phenothrin, Kintoki Sumithrin (registered trademark) emulsion [manufactured by Dainippon Jochugiku Co., Ltd.], for cyfluthrin, Kanesho Bisroid (registered trademark) EW [manufactured by Agro Kanesho Co., Ltd.], and for phthalthrin, Kintoki SNP emulsion A [manufactured by Dainippon Jochugiku Co., Ltd.] were each blended. The results are shown in Table 2.

[0080]

Table 2

[0081] From the results shown in Table 2, it was also found that when a pyrethroid compound having a phenoxybenzyl group other than etofenprox used in Test Example 1 was used as the active ingredient, adsorption of the active ingredient to the pouch occurred at a problematic level, and an adsorption inhibition effect was obtained by containing a water-soluble polymer compound. Comparative Examples 2-5 are examples using a pyrethroid compound having no phenoxybenzyl group as the active ingredient, and no problematic level of adsorption occurred even when the water-soluble polymer compound was not blended.

[0082] [Test Example 3] Test Using HDPE Containers and PET Containers Regarding the adsorbability of the active ingredient to the polyethylene that constitutes the innermost layer of the standing pouch container, a test was conducted using containers made of HDPE (high-density polyethylene), LLDPE (linear low-density polyethylene), and PET (polyethylene terephthalate) to determine whether there are differences depending on the type of polyethylene. Each component shown in Table 3 was used in the amounts shown in each table, and each specimen of the pest control composition was prepared in the same manner as in Test Example 1. The adsorption rate and decomposition rate were evaluated using the containers shown in Table 3. (A) As pyrethroid compounds, to obtain the compounding amounts shown in Table 3, for etofenprox, Trebon (registered trademark) emulsion [manufactured by Mitsui Chemical Crop & Life Solutions Co., Ltd.] was compounded, and for fenpropathrin, Rodee (registered trademark) emulsion [manufactured by Sumitomo Chemical Co., Ltd.] was compounded. The results are shown in Table 3.

[0083] In Table 3, as the HDPE container, an HDPE bottle (filled volume: 1100 mL) was used, as the LLDPE container, the same one as in Test Example 1 was used, and as the PET container, a PET bottle (filled volume: 1200 mL) was used.

[0084]

Table 3

[0085] It was found that adsorption of the active ingredient occurs at a level where it becomes a problem in the case of LLDPE containers. Although it is known that almost no adsorption occurs with PET, when evaluated using PET containers, the decrease in the active ingredient was slight. From these results, it was confirmed that the decrease in the active ingredient when using LLDPE containers is due to adsorption of the active ingredient to LLDPE, rather than decomposition of the active ingredient.

[0086] [Test Example 4] (B) Examination of the compounding amount of the water-soluble polymer compound Using each of the components shown in Table 4 in the amounts shown in each table, specimens of the pest control compositions of the examples and comparative examples were prepared in the same manner as in Test Example 1, and the adsorption rate and adsorption inhibition rate were evaluated. (A) As pyrethroid compounds, for etofenprox, Trebon (registered trademark) emulsion [manufactured by Mitsui Chemicals Crop & Life Solutions Co., Ltd.] and for fenpropathrin, Rodee (registered trademark) emulsion [manufactured by Sumitomo Chemical Co., Ltd.] were each blended so as to obtain the blending amounts shown in Table 4. The results are shown in Table 4.

[0087]

Table 4

[0088] As shown in Table 4, it was found that even when the amount of the water-soluble polymer compound (B) was changed, a sufficient adsorption inhibition effect of the active ingredient was obtained.

[0089] [Test Example 5] Test using a cellulose-based polymer compound as the water-soluble polymer compound Using a cellulose-based polymer compound as the water-soluble polymer compound, the adsorption inhibition effect was examined. Using each of the components shown in Table 5A and Table 5B in the amounts shown in each table, specimens of the pest control compositions of the examples and comparative examples were prepared in the same manner as in Test Example 1, and the adsorption rate and adsorption inhibition rate were evaluated. (A) As pyrethroid compounds, for etofenprox, Trebon (registered trademark) emulsion [manufactured by Mitsui Chemicals Crop & Life Solutions Co., Ltd.] and for fenpropathrin, Rodee (registered trademark) emulsion [manufactured by Sumitomo Chemical Co., Ltd.] were each blended so as to obtain the blending amounts shown in Table 5A and Table 5B. The results are shown in Table 5A and Table 5B.

[0090]

Table 5A

[0091]

Table 5B

[0092] As shown in Table 5A and Table 5B, it was found that by containing a cellulose-based polymer compound as the (B) water-soluble polymer compound, a sufficient adsorption inhibitory effect on the active ingredient can be obtained.

[0093] [Test Example 6] Test Using a Polyvinyl-Based Polymer Compound as the Water-Soluble Polymer Compound The adsorption inhibitory effect was examined when a polyvinyl-based polymer compound was used as the water-soluble polymer compound. Each component shown in Table 6A and Table 6B was used in the amounts shown in each table, and specimens of the pest control compositions of the examples and comparative examples were prepared in the same manner as in Test Example 1, and the adsorption rate and adsorption inhibition rate were evaluated. As the (A) pyrethroid compound, for etofenprox, Trebon (registered trademark) emulsion [manufactured by Mitsui Chemical Crop & Life Solutions Co., Ltd.] and for fenpropathrin, Rodey (registered trademark) emulsion [manufactured by Sumitomo Chemical Co., Ltd.] were respectively blended so as to obtain the blending amounts shown in Table 6A and Table 6B. The results are shown in Table 6A and Table 6B.

[0094]

Table 6A

[0095]

Table 6B

[0096] As shown in Table 6A and Table 6B, it was found that by containing a polyvinyl-based polymer compound as the (B) water-soluble polymer compound, a sufficient adsorption inhibitory effect on the active ingredient can be obtained.

[0097] [Test Example 7] Test Using a Viscous Polysaccharide as the Water-Soluble Polymer Compound The adsorption inhibitory effect was examined when a thickening polysaccharide was used as the water-soluble polymer compound. Each component shown in Tables 7A and 7B was used in the amounts shown in each table, and specimens of the pest control compositions of the examples and comparative examples were prepared in the same manner as in Test Example 1, and the adsorption rate and adsorption inhibition rate were evaluated. (A) As pyrethroid compounds, for etofenprox, Trebon (registered trademark) emulsion [manufactured by Mitsui Chemical Crop & Life Solutions, Inc.] and for fenpropathrin, Rodey (registered trademark) emulsion [manufactured by Sumitomo Chemical Co., Ltd.] were each blended so as to obtain the blending amounts shown in Tables 7A and 7B. The results are shown in Tables 7A and 7B.

[0098] [Table 7A]

[0099] [Table 7B]

[0100] As shown in Tables 7A and 7B, it was found that by containing a thickening polysaccharide as the water-soluble polymer compound, a sufficient adsorption inhibitory effect of the active ingredient can be obtained.

[0101] [Test Example 8] Test using a polyacrylic polymer compound as the water-soluble polymer compound The adsorption inhibition effect was examined when a polyacrylic polymer compound was used as the water-soluble polymer compound. Each component shown in Table 8A and Table 8B was used in the amounts shown in each table, and specimens of the pest control compositions of the examples and comparative examples were prepared in the same manner as in Test Example 1, and the adsorption rate and adsorption inhibition rate were evaluated. (A) As the pyrethroid compound, for etofenprox, Trebon (registered trademark) emulsion [manufactured by Mitsui Chemical Crop & Life Solutions Co., Ltd.] and for fenpropathrin, Rodey (registered trademark) emulsion [manufactured by Sumitomo Chemical Co., Ltd.] were blended so as to have the blending amounts shown in Table 8A and Table 8B, respectively. (B) As the water-soluble polymer compound, for polyacrylic acid, a 25% aqueous polyacrylic acid solution [manufactured by Fujifilm Wako Pure Chemical Corporation], for sodium polyacrylate, Aron (registered trademark) T-50 [manufactured by Toagosei Co., Ltd.], for ammonium polyacrylate, Aron (registered trademark) A-30SL [manufactured by Toagosei Co., Ltd.], and for polyacrylamide, Solagum (registered trademark) SH210 [manufactured by SEPPIC S.A.] were blended so as to have the blending amounts shown in Table 8A and Table 8B, respectively. The results are shown in Table 8A and Table 8B.

[0102]

Table 8A

[0103]

Table 8B

[0104] As shown in Table 8A and Table 8B, it was found that by containing a polyacrylic polymer compound as the water-soluble polymer compound (B), a sufficient adsorption inhibition effect of the active ingredient was obtained.

[0105] [Test Example 9] Test using a naphthalene sulfonic acid condensate or a polyalkylene oxide as the water-soluble polymer compound The adsorption inhibition effect was examined when a naphthalene sulfonic acid condensate or a polyalkylene oxide was used as the water-soluble polymer compound. Each component shown in Tables 9A and 9B was used in the amounts shown in each table, and specimens of the pest control compositions of the examples and comparative examples were prepared in the same manner as in Test Example 1, and the adsorption rate and the adsorption inhibition rate were evaluated. (A) As pyrethroid compounds, for etofenprox, Trebon (registered trademark) emulsion [manufactured by Mitsui Chemicals Crop & Life Solutions, Inc.], and for fenpropathrin, Rodeo (registered trademark) emulsion [manufactured by Sumitomo Chemical Co., Ltd.] were blended so as to have the blending amounts shown in Tables 9A and 9B. The results are shown in Tables 9A and 9B.

[0106]

Table 9A

[0107]

Table 9B

[0108] As shown in Tables 9A and 9B, it was found that by containing a naphthalene sulfonic acid condensate or a polyalkylene oxide as the water-soluble polymer compound (B), a sufficient adsorption inhibition effect of the active ingredient can be obtained.

[0109] [Test Example 10] Tests using various solvents The adsorption inhibition effect was examined when the type of solvent was changed. Each component shown in Tables 10A and 10B was used in the amounts shown in each table, and specimens of the pest control compositions of the examples and comparative examples were prepared in the same manner as in Test Example 1, and the adsorption rate and the adsorption inhibition rate were evaluated. (A) As pyrethroid compounds, for etofenprox, Trebon (registered trademark) emulsion [manufactured by Mitsui Chemicals Crop & Life Solutions, Inc.], and for fenpropathrin, Rodeo (registered trademark) emulsion [manufactured by Sumitomo Chemical Co., Ltd.] were blended so as to have the blending amounts shown in Tables 10A and 10B. The results are shown in Tables 10A and 10B.

[0110] The LogKow of the (C) solvents described in Table 10A and Table 10B is as follows. Isopropyl myristate: LogKow 7.17 Normal paraffin (C11 - 15): LogKow 5.74 1 - Decanol: LogKow 3.79 1 - Octanol: LogKow 2.81 2 - Heptanol: LogKow 2.24 Anisole: LogKow 2.07

[0111]

Table 10A

[0112]

Table 10B

[0113] As shown in Table 10A and Table 10B, it was found that by containing a solvent with a LogKow of 2 or more, the adsorption inhibition effect of the active ingredient can be further enhanced.

Claims

1. A pest control composition containing a pyrethroid compound having a phenoxybenzyl group, a water-soluble polymer compound, and water, wherein the pest control composition is filled in a packaging material whose innermost layer is made of linear low-density polyethylene.

2. The pest control composition according to claim 1, further containing a solvent having a LogKow of 2 or more.

3. The pest control composition according to claim 1 or 2, wherein the water-soluble polymer compound is at least one selected from polyvinyl-based polymer compounds, cellulose-based polymer compounds, polyacrylic-based polymer compounds, naphthalenesulfonic acid condensates, polyalkylene oxides, and thickening polysaccharides.

4. A method for suppressing the adsorption of a pyrethroid compound having a phenoxybenzyl group to a packaging material whose innermost layer is made of linear low-density polyethylene, the method including adding a water-soluble polymer compound to a pest control composition containing a pyrethroid compound having a phenoxybenzyl group and water.

5. The method according to claim 4, wherein the water-soluble polymer compound is at least one selected from polyvinyl-based polymer compounds, cellulose-based polymer compounds, polyacrylic-based polymer compounds, naphthalenesulfonic acid condensates, polyalkylene oxides, and thickening polysaccharides.

Images