JP2014028798A - Microcapsules - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide novel microcapsules in which photodecomposition of an agrochemical active component is suppressed.SOLUTION: The microcapsules contain (a) an agrochemical active component, a survival rate of which after irradiation with xenon light of intensity of 0.68 W/mat 340 nm with a cutoff at 290nm for 8 hours is 50% or more, and that for 56 hours is 40% or more and 60% or less and (b) a hydrophobic organic solvent. A weight ratio of the agrochemical active component and the hydrophobic organic solvent is 5:95 to 70:30.

Description

  The present invention relates to a microcapsule in which photodegradation of an agrochemical active ingredient is suppressed.

  So far, various studies have been made for the purpose of suppressing the photodegradation of pesticidal active ingredients which are unstable to light, and pesticidal active ingredients and UV protective agents such as titanium dioxide and zinc oxide are used as organic solvents. A microcapsule that is contained is known (see, for example, Patent Document 1).

Japanese National Patent Publication No. 11-504030

  An object of the present invention is to provide a new microcapsule in which photodegradation of an agrochemical active ingredient is suppressed.

As a result of investigations to find microcapsules in which photodegradation of the pesticidal active ingredient was suppressed, the present inventors (a) after irradiating xenon light with a cutoff of 290 nm at an intensity of 0.68 W / m ² at 340 nm for 8 hours. Agrochemical active ingredient (hereinafter sometimes referred to as component a) having a residual ratio of 50% or more and a residual ratio of 40% or more and 60% or less after irradiation for 56 hours, and (b) a hydrophobic organic solvent In a microcapsule containing (hereinafter sometimes referred to as component b), it was found that photodecomposition of component a can be suppressed when the weight ratio of component a and component b is in a specific range. .
That is, the present invention is as follows.
[1] (a) The residual rate after irradiating xenon light with a cutoff of 290 nm at an intensity of 0.68 W / m ² at 340 nm for 8 hours is 50% or more, and the residual rate after irradiating for 56 hours is 40% or more 60 Agrochemical active ingredient that is less than
And (b) a microcapsule containing a hydrophobic organic solvent, wherein the weight ratio of the pesticidal active ingredient to the hydrophobic organic solvent is 5:95 to 70:30.
[2] The microcapsule according to [1], having an average particle size of 5 to 60 μm.
[3] The microcapsule according to [1] or [2], wherein the pesticidal active ingredient is a solid pesticidal active ingredient at room temperature.
[4] In any one of [1] to [3], the hydrophobic organic solvent is one or more hydrophobic organic solvents selected from the group consisting of esters, ketones, aromatic hydrocarbons, and paraffins. The microcapsule described.
[5] An aqueous suspended agricultural chemical composition in which the microcapsules according to any one of [1] to [4] are suspended in a water continuous phase.

  According to the present invention, photodegradation of an agrochemical active ingredient can be suppressed.

  The microcapsule of the present invention (hereinafter referred to as the present invention microcapsule) is a microcapsule containing a pesticidal active ingredient that is unstable to light like component a, and is effective in photodegradation of the pesticidal active ingredient. It is an agrochemical-containing microcapsule that can be suppressed.

Here, xenon light means a light source in which the gas filled in the tube is xenon. Normally, xenon light shows the same spectrum uniquely. The xenon light having a cutoff of 290 nm means xenon light having a wavelength range of 290 nm or more, and this corresponds to xenon light that has passed through a borosilicate filter.
More specifically, the method for calculating the residual ratio of the pesticidal active ingredient as defined above is such that, first, 250 mg of the pesticidal active ingredient can be sufficiently dissolved in the pesticidal active ingredient such as acetone and has high volatility. Dissolve in 50 mL of solvent, add 1 mL of the solution to a glass petri dish having a diameter of 6 cm with a whole pipette, spread the whole, and then air dry at room temperature. A weather resistance tester (trade name: Q-SUN xenon accelerated weather resistance) in which the petri dish is covered with a quartz glass lid and a borosilicate filter (trade name: Daylight-BB Optical filter, manufactured by Q-Lab) is attached. Installed in a tester model Xe-3 (manufactured by Q-Lab), with xenon light specified under conditions of an intensity of 0.68 W / m ^{2 at} 340 nm and a temperature of 35 ° C. (35 ° C. with a heat insulating black panel thermometer). After irradiating for hours, the pesticidal active ingredient remaining in the petri dish is quantified by, for example, a known quantitative method such as high performance liquid chromatography, and calculated as a weight percentage with respect to 5 mg of the pesticidal active ingredient used above. The survival rate can be obtained.

The agrochemical active ingredient used in the microcapsules of the present invention may be any of an insecticidal active ingredient, a bactericidal active ingredient, and a herbicidal active ingredient, and is not particularly limited, but the use of a solid agrochemical active ingredient at room temperature (25 ° C.) Is preferred. As such an agrochemical active ingredient, for example, the residual rate after irradiation with xenon light having a cutoff of 290 nm obtained by the above calculation method at an intensity of 0.68 W / m ² at 340 nm for 8 hours is 93.1% and 56 hours. 2-[(2,5-dimethylphenoxy) methyl] -α-methoxy-N-methyl-benzeneacetamide (CAS registry number 173662-97-0), which has a residual rate after irradiation of 50.3%. .

  The microcapsules of the present invention contain component a in a total amount, usually 1 to 80% by weight, preferably 10 to 70% by weight, based on the total amount of the microcapsules of the present invention.

  In the microcapsule of the present invention, component b means an organic solvent that is liquid at room temperature (25 ° C.) and immiscible with water. Specifically, an organic solvent having a water solubility at 25 ° C. of 20% by weight or less is used. Examples of the hydrophobic organic solvent include hydrophobic organic solvents such as vegetable oils, esters, ketones, aromatic hydrocarbons, and paraffins, and examples thereof include the following hydrophobic organic solvents.

  Vegetable oil: rapeseed oil, soybean oil, linseed oil, corn oil and olive oil

  Esters: diisobutyl adipate, diisodecyl adipate, dialkyl phthalate (such as didecyl phthalate), octyl oleate, lauryl oleate, octyldodecyl oleate and isopropyl myristate

  Ketones: methyl isobutyl ketone, heptanone, octanone, nonanone, cyclohexanone and acetophenone

Aromatic hydrocarbons: toluene, xylene, phenylxylylethane, 1-phenyl-1-ethylphenylethane, methylnaphthalene, dimethylnaphthalene, triisopropylbiphenyl and dimethylisopropylnaphthalene In the present invention, aromatic hydrocarbons are commercially available. Aromatic hydrocarbon solvents that are used can be used. Examples of such commercially available aromatic hydrocarbon solvents include Hysol SAS-296 (a mixture of 1-phenyl-1-xylylethane and 1-phenyl-1-ethylphenylethane, JX Nippon Oil & Energy Corporation trade name). ), Hysol SAS-LH (trade name of JX Nippon Oil & Energy Corporation), Cactus solvent HP-MN (80% methylnaphthalene, trade name of JX Nippon Oil & Energy Corporation), Cactus solvent HP-DMN (80% dimethylnaphthalene) , JX Nippon Oil & Energy Corporation trade name), Cactus solvent P-180 (Methyl naphthalene and dimethyl naphthalene mixture, JX Nippon Oil & Energy Corporation trade name), Cactus solvent P-200 (methyl naphthalene and dimethyl naphthalene Mixture, JX Nippon Oil & Energy Cactus solvent P-220 (mixture of methylnaphthalene and dimethylnaphthalene, JX Nippon Oil & Energy Corporation product name), Cactus solvent PAD-1 (dimethyl monoisopropyl naphthalene, JX Nippon Oil & Energy Corporation) Product Name), Solvesso 100 (Aromatic Hydrocarbon, ExxonMobil Chemical Co., Ltd.), Solvesso 150 (Aromatic Hydrocarbon, ExxonMobil Chemical Co., Ltd.), Solvesso 200 (Aromatic Hydrocarbon, ExxonMobil Chemical Co., Ltd.) Company product name), Solvesso 150ND (aromatic hydrocarbon, ExxonMobil Chemical Co., Ltd. product name), Solvesso 200ND (aromatic hydrocarbon, ExxonMobil Chemical Co., Ltd. product name), Ruetasolv BP 4302 (manufactured by RKS GmbH), Nikanol Fudow Ltd. trade name), Swasol 100 (toluene, Maruzen Petrochemical Co., Ltd. trade name) and Swasol 200 (xylene, Maruzen Petrochemical Co., Ltd. trade name).

Paraffins: normal paraffin, isoparaffin, cycloparaffin and liquid paraffin In the present invention, a commercially available paraffin solvent can be used as paraffins. Examples of such commercially available paraffin solvents include NORPER 13 (normal paraffin, ExxonMobil Chemical Co., Ltd., trade name), NORPER 15 (Normal Paraffin, ExxonMobil Chemical Co., Ltd., trade name), and ISOPAR E (isoparaffin, ExxonMobil Chemical). Product name), Isopar G (Isoparaffin, ExxonMobil Chemical Co., Ltd.), Isopar L (Isoparaffin, ExxonMobil Chemical Co., Ltd.), Isopar H (Isoparaffin, ExxonMobil Chemical Co., Ltd.), Isopar M (Isoparaffin, ExxonMobil Chemical Co., Ltd. trade name), Moresco White P-40 (liquid paraffin, MORESCO trade name), Moresco White P-70 (liquid paraffin, MORESCO trade name), Resco White P-200 (liquid paraffin, trade name of MORESCO, Inc.), Exol D110 (mixture of paraffin and cycloparaffin, trade name of ExxonMobil Chemical), Exol D130 (mixture of paraffin and cycloparaffin, ExxonMobil Chemical) Trade name), Exol D160 (mixture of paraffin and cycloparaffin, trade name of ExxonMobil Chemical Co., Ltd.).

  Component b used in the microcapsules of the present invention is not particularly limited, and in particular, use of one or more hydrophobic organic solvents selected from the group consisting of esters, ketones, aromatic hydrocarbons, and paraffins is possible. preferable.

  In the microcapsule of the present invention, the weight ratio of component a to component b is 5:95 to 70:30, preferably 30:70 to 70:30. Moreover, this invention microcapsule contains 20 to 95 weight% normally with respect to this invention microcapsule whole quantity with the total amount of component b, Preferably it contains 30 to 90 weight%.

The microcapsules of the present invention preferably further contain one or more UV protection agents. Examples of such UV protective agents include benzophenone-based UV absorbers such as 2,4-dihydroxybenzophenone, 2-hydroxy-4-methoxybenzophenone, 2-hydroxy-4-n-octyl-benzophenone, 2- (2-hydroxy- 5-methylphenyl) benzotriazole, 2- [2-hydroxy-3- (3,4,5,6-tetrahydrophthalimido-methyl) -5-methylphenyl] benzotriazole, 2- (3-tert-butyl-2 -Hydroxy-5-methylphenyl) -5-chlorobenzotriazole, 2- (2-hydroxy-5-tert-octylphenyl) benztriazole, 2- (2-hydroxy-3,5-di-tert-pentylphenyl) Benzotriazole UV absorbers such as benzotriazole, , 4-Di-tert-butylphenyl benzoate UV absorbers such as 3,5-di-tert-butyl-4-hydroxybenzoate, 2- (2hydroxy-4- [1-octyloxycarbonylethoxy] phenyl)- Hydroxyphenyltriazine-based ultraviolet absorbers such as 4,6-bis (4-phenylphenyl) -1,3,5-triazine, non-sulfonated lignin (for example, trade name INDULIN AT, manufactured by Mead Westbeco), hindered amine Examples thereof include a light stabilizer such as a light stabilizer (HALS) and an inorganic ultraviolet shielding agent such as titanium oxide.
Although the ultraviolet protective agent used for the microcapsule of the present invention is not particularly limited, it is particularly preferable to use an ultraviolet protective agent that is miscible with component b.

  When the microcapsules of the present invention contain an ultraviolet protective agent (hereinafter sometimes referred to as component c), the total content is usually 1 to 50% by weight, preferably 3%, based on the total amount of the microcapsules of the present invention. -35% by weight.

  The microcapsule of the present invention is a microcapsule in which droplets containing component a, component b, and more preferably component c are coated with a resin. Component a is suspended or dissolved in component b. When component c is contained, component c is suspended or dissolved in component b.

The film in the microcapsule of the present invention is formed from a resin. Examples of such resins include thermosetting resins such as polyurethane resins, polyurea resins, urea formalin resins, melamine urea resins, and phenol formalin resins.
Of these, use of a polyurethane resin or a polyurea resin is preferable.

  The polyurethane resin or polyurea resin preferably used as the resin for forming the film of the microcapsule of the present invention is usually a resin obtained by reacting polyisocyanate with polyol or polyamine.

Examples of such polyisocyanates include hexamethylene diisocyanate, an adduct of hexamethylene diisocyanate and trimethylolpropane, a biuret condensate of hexamethylene diisocyanate three molecules, an adduct of tolylene diisocyanate and trimethylolpropane, and an isocyanate of tolylene diisocyanate. Nurate condensate, isocyanurate condensate of hexamethylene diisocyanate, isocyanurate condensate of isophorone diisocyanate, one isocyanate part of hexamethylene diisocyanate forms an isocyanurate body with two molecules of tolylene diisocyanate, and the other isocyanate part has two molecules Isocyanate prepolymers that constitute isocyanurates with other hexamethylene diisocyanates, 4,4 ′ -Methylenebis (cyclohexyl isocyanate) and trimethylhexamethylene diisocyanate are mentioned.
The amount of polyisocyanate used in the present invention is usually determined according to the amount of the microcapsule film obtained. The amount of the microcapsule film obtained is usually 0.1 to 40% by weight, preferably 0.2 to 30% by weight, based on the total amount of the microcapsules obtained. The amount of polyisocyanate used in the present invention is usually 25 to 95% by weight, preferably 50 to 90% by weight, based on the amount of the microcapsule film.

Examples of such polyols include ethylene glycol, propylene glycol, butylene glycol, and cyclopropylene glycol.
Examples of such polyamines include ethylenediamine, hexamethylenediamine, diethylenetriamine, and triethylenetetramine.
The amount of the polyol or polyamine used in the present invention is usually determined according to the amount of the microcapsule film obtained. The amount of polyol used in the present invention is usually 1 to 80% by weight, preferably 3 to 60% by weight, based on the amount of the microcapsule coating. The amount of polyamine used in the present invention is usually 1 to 40% by weight, preferably 3 to 20% by weight, based on the amount of the microcapsule coating.

  Although the manufacturing method (henceforth this manufacturing method) of this invention microcapsule is demonstrated, this manufacturing method is not limited only to the following method.

  This manufacturing method includes the following first to third steps.

The first step of the production method is a step of preparing a suspension or solution of component a by suspending or dissolving component a in component b.
Component a is suspended or dissolved in component b.
When the component a is a solid component a (hereinafter referred to as the solid component a) at room temperature (25 ° C.), the solubility of the solid component a in the component b and the weight ratio of the solid component a to the component b are It can take the form of a suspension (hereinafter referred to as the present suspension a). This suspension a can be prepared by, for example, using a wet pulverizer such as a bead mill and finely pulverizing the solid component a in the component b. Further, for example, it can be prepared by using a dry pulverizer such as a jet mill and adding the component a to the component b after pulverizing the solid component a as it is or adding other components.
A solution in which component a is dissolved in component b can be prepared by dissolving component a in component b.

  When the solid component a is dispersed in the form of fine particles in the component b, that is, suspended, the average particle size of the fine particles is usually 15 μm or less, preferably 1 to 10 μm, more preferably 1 to 5 μm. is there.

When the microcapsule of the present invention contains component c, the first step includes a step of suspending or dissolving component a and component c in component b to prepare a suspension or solution of component a and component c, respectively. .
In the suspension or solution of the component a and the component c, the component a and the component c are in any one of the following (1) to (4).
(1) Component a and component c are both suspended in component b.
(2) Component c is dissolved in component b, and component a is suspended in component b in which component c is dissolved.
(3) Component a is dissolved in component b, and component c is suspended in component b in which component a is dissolved.
(4) Component a and component c are both dissolved in component b.
In the case of the solid component a, the state (1) or (2) can be taken depending on the solubility of the solid component a in the component b and the weight ratio of the solid component a to the component b. When component c is solid component c (hereinafter referred to as solid component c) at room temperature (25 ° C.), the solubility of solid component c in component b and the weight ratio of solid component c to component b The state (1) or (3) can be taken.

The suspensions (1) to (3) can be prepared by the same operation as the method for preparing the suspension a. When preparing the suspension of (1) above, in the preparation method of the main suspension a, the solid component a and the solid component c may be simultaneously pulverized by a wet pulverizer or a dry pulverizer, The suspension a and the suspension in which the solid component c is suspended in the component b may be separately prepared and then mixed. When preparing the suspension of (2) above, the component c is usually dissolved in the component b, and then the solid component a is added to the solution. When preparing the suspension of (3) above, the component a is usually dissolved in the component b, and then the solid component c is added to the solution.
The solution (4) can be prepared by dissolving component a and component c in component b.

When the resin for forming the film is a polyurethane resin or a polyurea resin, polyisocyanate is usually added in advance to the suspension or solution obtained in the first step.
The suspension obtained by suspending or dissolving the component a obtained in the first step and the component c added as necessary in the component b can be used immediately in the next step. preferable.

  The second step of the production method is a step of preparing droplets by mixing the suspension or solution obtained in the first step and water.

The weight of water used in the second step is usually in the range of 0.8 to 2 times the weight of the suspension or solution obtained in the first step. As the water used in the second step, deionized water is preferably used, and a thickener may be added as necessary.
Such thickeners include, for example, natural polysaccharides such as gum arabic, xanthan gum, rhamzan gum, locust bean gum, guar gum, carrageenan, welan gum, alginic acid, alginates, tragacanth gum; polyvinyl alcohol, polyvinyl pyrrolidone, vinyl acetate copolymer, poly Vinyl polymers such as sodium acrylate, synthetic polymers such as polyoxyalkylene; semi-synthetic polymers such as carboxymethylcellulose; minerals such as aluminum silicate, magnesium aluminum silicate, smectite, bentonite, hectorite, synthetic hydrous silicic acid, dry silica And powdered alumina; and alumina sol. Commercial products can be used as they are as the thickeners. Examples of such commercially available products include Kelzan S (CP Kelco Co., Ltd.), which is Xanthan Gum, Bee Gum Granule (Vanderbilt Co., Ltd.), which is aluminum silicate, and Aerosil 200 (Evonik Degussa Co., Ltd.), which is a dry silica. ).

  In the second step, the method for preparing droplets in water includes, for example, a method of adding the suspension or solution obtained in the first step to water and then stirring with a stirrer. Examples of the stirrer used at this time include a propeller stirrer, a turbine stirrer, and a high-speed shear stirrer. Specific examples of the stirrer include T.M. manufactured by PRIMIX Corporation. K. Homomixer, T.M. K. Homomic line flow, T.W. K. Pipeline homomixers and T.W. K. Examples include: Fillmix; CLEAMIX manufactured by M Technique Co., Ltd .; Polytron homogenizer and Megatron homogenizer manufactured by KINEMATICA AG; and Supraton manufactured by Tsukishima Kikai Co., Ltd.

  In the second step, the polyol or polyamine is usually added after preparing the droplets in water. When a polyol is added, a microcapsule with a film made of a polyurethane resin is obtained. When polyamine is added, microcapsules with a coating made of polyurea resin can be obtained. The polyol or polyamine may be added before preparing the droplets in water, but is preferably added after the preparation in order to prevent the reaction between the polyisocyanate being prepared and the polyol or polyamine.

  The third step is a step of forming a resin film around the droplets obtained in the second step. In the droplets present in the water obtained in the second step, the polyisocyanate is dissolved in component b. For this reason, the polyisocyanate contained in the droplet and the polyol or polyamine present in the water are polymerized at the interface of the droplet. As a result, a polyurethane or polyurea film is formed around the droplets, and microcapsules are obtained as an aqueous suspension.

  When the resin that forms the film is a polyurethane resin, for example, the aqueous dispersion of the droplets obtained in the second step is heated to 40 to 80 ° C. with stirring and held for about 0.5 to 48 hours. A polyurethane resin film is formed around the droplets. When the resin that forms the film is a polyurea resin, for example, by adjusting the liquidity of the aqueous dispersion of droplets to neutral to weakly alkaline and holding at 0 to 60 ° C. for about 0.5 to 48 hours, A polyurea resin film is formed around the droplets.

  The average particle size of the microcapsules of the present invention is substantially the same as the average particle size of the droplets prepared in the second step. The average particle size of the droplets prepared in the second step and the average particle size of the microcapsules of the present invention are usually 5 to 60 μm, preferably 10 to 45 μm.

  In the present invention, the average particle diameter means a volume median diameter. The volume median diameter refers to a particle diameter that is 50% in cumulative frequency in a volume-based frequency distribution, and can be obtained by wet measurement using, for example, a laser diffraction particle size distribution measuring apparatus. More specifically, the measurement is performed using the apparatus in which droplets or microcapsules are dispersed in water. An example of such a laser diffraction particle size distribution analyzer is Mastersizer 2000 (manufactured by Malvern).

By this production method, the microcapsules of the present invention are obtained as an aqueous suspension composition.
The microcapsules of the present invention obtained by this production method can be used as a powder preparation of microcapsules from an aqueous suspension composition by centrifugation, filtration, spray drying or the like.

  In addition, the microcapsule of the present invention is continuously added to the aqueous suspension composition of the microcapsule of the present invention obtained by the present production method by further adding an agrochemical adjuvant used in an ordinary aqueous suspension pesticide composition. It can be used as an aqueous suspension agricultural chemical composition (hereinafter referred to as the present invention composition) suspended in a phase. In this case, the microcapsules of the present invention obtained by the production method are used, for example, as an aqueous suspended agricultural chemical composition containing 0.5 to 25% by weight of component a in the total amount of the composition of the present invention.

  Examples of the agrochemical adjuvant that may be contained in the composition of the present invention include surfactants, thickeners, antifoaming agents, preservatives, antifreezing agents, and pH adjusters.

Examples of such surfactants include nonionic surfactants, cationic surfactants, anionic surfactants, and amphoteric surfactants. Nonionic surfactants include, for example, polyoxyethylene alkyl ether, polyoxyethylene alkyl aryl ether, polyoxyethylene lanolin alcohol, polyoxyethylene alkylphenol formalin condensate, polyoxyethylene sorbitan fatty acid ester, polyoxyethylene glyceryl mono fatty acid. Ester, polyoxypropylene glycol monofatty acid ester, polyoxyethylene sorbitol fatty acid ester, polyoxyethylene castor oil derivative, polyoxyethylene fatty acid ester, higher fatty acid glycerin ester, sorbitan fatty acid ester, sucrose fatty acid ester, polyoxyethylene polyoxypropylene Block polymer, polyoxyethylene fatty acid amide, alkylolamide, polyoxyethylene Down alkylamines, and polyoxyethylene alkane diol.
Examples of the cationic surfactant include alkylamine hydrochlorides such as dodecylamine hydrochloride; dodecyltrimethylammonium salt, alkyldimethylbenzylammonium salt, alkylpyridinium salt, alkylisoquinolinium salt, dialkylmorpholinium salt and the like. Examples include alkyl quaternary ammonium salts; benzethonium chloride, and polyalkylvinylpyridinium salts.
Examples of the anionic surfactant include fatty acid sodium such as sodium palmitate; sodium ether carboxylate such as sodium polyoxyethylene lauryl ether carboxylate; amino acid condensate of higher fatty acid such as sodium lauroyl sarcosine and sodium N-lauroyl glutamate Higher fatty acid ester sulfonates such as higher alkyl sulfonates and lauric acid ester sulfonates; dialkyl sulfosuccinates such as dioctyl sulfosuccinate; higher fatty acid amide sulfonates such as oleic acid amide sulfonic acid; dodecylbenzene sulfone Alkylaryl sulfonates such as sodium acid and diisopropylnaphthalene sulfonate; formalin condensate of alkylaryl sulfonate, pentadecane-2-sulfate Polyoxyethylene alkyl phosphoric acid esters such as di-polyoxyethylene dodecyl ether phosphate; higher alcohol sulfuric acid ester salts and the like styrene - maleic acid copolymer; lignin sulfonate salts.
Examples of amphoteric surfactants include N-laurylalanine, N, N, N-trimethylaminopropionic acid, N, N, N-trihydroxyethylaminopropionic acid, N-hexyl-N, N-dimethylaminoacetic acid, Examples include 1- (2-carboxyethyl) pyrimidinium betaine, and lecithin.
When this invention composition contains surfactant, the total content is 0.1-20 weight% normally with respect to this invention composition whole quantity, Preferably it is 0.5-10 weight%.

Examples of the thickener include those exemplified above.
When this invention composition contains a thickener, the total content is 0.01 to 10 weight% normally with respect to this invention composition whole quantity, Preferably it is 0.1 to 5 weight%.

Examples of such antifoaming agents include Antifoam C emulsion (trade name of Toray Dow Corning Co., Ltd.), Antifoam CE (trade name of Toray Dow Corning Co., Ltd.), TSA730 (trade name of Momentive Performance Materials Japan GK). ), TSA731 (product name of Momentive Performance Materials Japan LLC), TSA732 (product name of Momentive Performance Materials Japan LLC), YMA6509 (product name of Momentive Performance Materials Japan LLC) Fluoro-based antifoaming agents such as antifoaming agents; and Fluorowet PL80 (trade name of Clariant).
When this invention composition contains an antifoamer, the total content is 0.01-3 weight% normally with respect to this invention composition whole quantity, Preferably it is 0.05-1 weight%.

Examples of such preservatives include p-hydroxybenzoic acid ester, salicylic acid derivative, proxel (1,2-benzisothiazolin-3-one) and isothiazoline-3-one derivative (for example, Biohope L (Kay Eye Chemical Co., Ltd. product). Name)).
When this invention composition contains antiseptic | preservative, the total content is 0.01 to 5 weight% normally with respect to this invention composition whole quantity, Preferably it is 0.05 to 3 weight%.

Examples of such antifreezing agents include water-soluble glycols such as ethylene glycol and propylene glycol.
When this invention composition contains a cryoprotectant, the total content is 0.5-30 weight% normally with respect to this invention composition whole quantity, Preferably it is 1-20 weight%.

Examples of the pH adjuster include citric acid monohydrate, sorbic acid, potassium sorbate and the like, disodium hydrogen phosphate, dipotassium hydrogen phosphate, and sodium hydroxide.
When this invention composition contains a pH adjuster, the total content is 0.01 to 5 weight% normally with respect to this invention composition whole quantity, Preferably it is 0.5 to 3 weight%.

  The water used for the composition of the present invention is not particularly limited, and water used for ordinary aqueous suspension pesticide compositions such as tap water, well water and deionized water can be used.

  The composition of the present invention contains 40 to 95% by weight, preferably 45 to 90% by weight of water based on the total amount of the composition of the present invention.

The composition of the present invention can be applied to places such as paddy fields, upland fields, orchards, lawns, and non-agricultural lands in the same manner as ordinary aqueous suspended agricultural chemical compositions. The composition of the present invention can be applied by a method such as diluting the composition of the present invention with water as desired, and spraying the obtained water-diluted solution on plants growing in the place or soil in the place. Examples of the method for spraying the water dilution include spraying the surface of the water dilution with a known sprayer or the like, spraying foliage, and the like.
Moreover, this water dilution liquid can also be used for seed treatment, seedling box treatment, and the like.

  The composition of the present invention can be applied as it is without diluting with water. For example, a method of spraying the composition of the present invention from the shore of a flooded sewage paddy field along the shore of the paddy can be mentioned. Before spraying, the container containing the composition of the present invention is usually shaken lightly to mix the composition of the present invention.

  EXAMPLES Next, although an Example demonstrates this invention still in detail, this invention is not limited only to these examples.

  First, a manufacture example and a comparative manufacture example are shown.

Production Example 1
2-[(2,5-dimethylphenoxy) methyl] -α-methoxy-N-methyl-benzeneacetamide (hereinafter referred to as Compound A) was converted into a vertical jet mill (JOM-0101 type jet mill, Seisin Co., Ltd.). Compound A fine powder having an average particle size of 10 μm or less was prepared by dry pulverization by a company). 10 parts by weight of Compound A fine powder obtained, 0.2 parts by weight of polyisocyanate (trade name: Sumidur L-75, manufactured by Sumika Bayer Urethane Co., Ltd.) and aromatic hydrocarbons (trade name: Solvesso 200ND, ExxonMobil) (Chemical Co., Ltd.) 19.8 parts by weight were mixed to obtain a compound A suspension. 30 parts by weight of the suspension was added to 33 parts by weight of an aqueous solution of 5% by weight polyvinyl alcohol (trade name: Gohsenol GH-17, manufactured by Nippon Synthetic Chemical Industry Co., Ltd.). This mixture was stirred with a rotor-stator type homogenizer (trade name: Polytron homogenizer, manufactured by KINEMATICA AG) to suspend the Compound A suspension in an aqueous polyvinyl alcohol solution to obtain a Compound A emulsion. To the obtained emulsion, 2 parts by weight of a 1.2 wt% aqueous solution of diethylenetriamine (manufactured by Wako Pure Chemical Industries, Ltd.) was added and stirred at 60 ° C. for 3 to 4 hours. A composition was obtained.
To 14.2 parts by weight of deionized water, 0.4 part by weight of magnesium aluminum silicate (trade name: Beegum Granule, manufactured by Vanderbilt) was added and stirred at room temperature for 15 minutes. To this was added 0.2 parts by weight of xanthan gum (trade name: Kelzan S, CP Kelco) and 5 parts by weight of propylene glycol. The mixture was stirred at 60 ° C. for 60 minutes. After cooling the obtained dispersion to room temperature, 0.2 parts by weight of a preservative (trade name: Proxel GXL, manufactured by Arch Chemicals) was added to the dispersion to prepare a viscosity adjusting liquid. 20 parts by weight of the viscosity adjusting liquid, 15 parts by weight of water and 65 parts by weight of the aqueous suspension composition were mixed to obtain the present composition (1) containing 10% by weight of Compound A. The average particle size of the microcapsules containing Compound A was 31.8 μm.

Production Example 2
Same as Production Example 1 except that 10 parts by weight of Compound A fine powder prepared in Production Example 1 is 2.5 parts by weight and 19.8 parts by weight of aromatic hydrocarbon (same as above) is 27.3 parts by weight. The present composition (2) containing 2.5% by weight of compound A was obtained. The average particle size of the microcapsules containing Compound A was 39.9 μm.

Production Example 3
Compound A was prepared in the same manner as in Production Example 1 except that the average particle size 31.8 μm of the microcapsules containing Compound A was adjusted to 9.9 μm by adjusting the stirring force with a rotor-stator type homogenizer (same as above). This invention composition (3) which contains 10weight% was obtained.

Production Example 4
Compound A was prepared in the same manner as in Production Example 1 except that the average particle size of 31.8 μm of the microcapsules containing Compound A was changed to 3.7 μm by adjusting the stirring force with a rotor-stator homogenizer (same as above). This invention composition (4) containing 10 weight% was obtained.

  Next, test examples are shown.

Test example 1
The compositions (1) to (4) of the present invention were diluted with water so that the active ingredient concentration was 1120 ppm. 100 μL of each diluted solution was added to a glass petri dish having a diameter of 6 cm and spread uniformly, and then air-dried at room temperature. A weather resistance tester (trade name: Q-SUN xenon accelerated weather resistance) in which the petri dish is covered with a quartz glass lid and a borosilicate filter (trade name: Daylight-BB Optical filter, manufactured by Q-Lab) is attached. It is installed in a tester model Xe-3 (manufactured by Q-Lab), and the xenon light is 168 under the conditions of an intensity of 0.68 W / m ^{2 at} 340 nm and a temperature of 34 ° C. (34 ° C. with a heat insulating black panel thermometer). Irradiated for hours. After irradiation, compound A remaining in the petri dish was extracted with acetone, analyzed and quantified by high performance liquid chromatography, and calculated as a percentage by weight with respect to the amount of compound A before irradiation, to determine the residual rate.
The results are shown in Table 1.

Claims (5)

(A) The residual rate after irradiating xenon light with a cutoff of 290 nm at an intensity of 0.68 W / m ² at 340 nm for 8 hours is 50% or more, and the residual rate after irradiating for 56 hours is 40% or more and 60% or less. An agrochemical active ingredient,
And (b) a microcapsule containing a hydrophobic organic solvent, wherein the weight ratio of the pesticidal active ingredient to the hydrophobic organic solvent is 5:95 to 70:30. The microcapsule according to claim 1, having an average particle diameter of 5 to 60 µm. The microcapsule according to claim 1 or 2, wherein the pesticidal active ingredient is a pesticidal active ingredient that is solid at room temperature. The microcapsule according to any one of claims 1 to 3, wherein the hydrophobic organic solvent is at least one hydrophobic organic solvent selected from the group consisting of esters, ketones, aromatic hydrocarbons, and paraffins. An aqueous suspended agricultural chemical composition in which the microcapsules according to any one of claims 1 to 4 are suspended in a water continuous phase.