JPS645563B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to a liquid agricultural chemical with improved fluidity, and the object thereof is to provide a new formulation of the agricultural chemical that can be sprayed as is or at a low dilution ratio, that is, at a high concentration of the active ingredient. Conventional pesticide formulations can be broadly divided into four types: powders, powders, granules, wettable powders, and emulsions. Powders contain about 2 to 5% of agricultural chemical active ingredients, are mixed with, adhered to, and adsorbed with inorganic carriers such as talc, clay, kaolin, diatomaceous earth, pentonite, calcium carbonate, and white carbon, and are usually sprayed as they are. Powder is made by granulating a powder using a binder such as polyvinyl alcohol, carboxymethyl cellulose, starch, or sodium lignin sulfonate, and has a particle size of about 50 to 200 microns. Wettable powders contain about 20 to 50% of agricultural chemical active ingredients and are composed of inorganic carriers and dispersants used in powders, and are dispersed and diluted in water before being sprayed. The emulsion contains about 20-50% of the active ingredient of pesticides, xylene,
It consists of organic solvents such as hexane and mineral oil, and emulsifiers, etc., and is emulsified and diluted in water before being sprayed. The biggest drawback of such formulations of pesticides is that they produce dust during handling and spraying, and drift is noticeable not only during normal spraying but also during aerial spraying by aircraft, and their use has been drastically reduced in recent years. Powder was developed to prevent this drift, and although it is in practical use, it is expensive, and its low concentration of active ingredients makes aerial spraying less efficient. Usage has been stagnant in recent years. Since the wettable powder contains a large amount of inorganic carrier, the diluted dispersion is unstable and may cause sedimentation, which may clog the nozzle of the sprayer and the atomizer. Furthermore, if the dilution ratio is low, the resulting slurry becomes highly viscous or paste-like, which often causes problems when spraying small amounts of liquid by aircraft. Emulsions are excellent in terms of workability, but the biggest problem is contamination and damage to coatings caused by the organic solvents they contain. Furthermore, carpamate drugs, which are major insecticides, are poorly soluble or insoluble in many organic solvents, making it difficult to emulsify them.
It is about 15%. Aerial spraying of pesticides has changed from the era of solid pesticide spraying, mainly powder, to the era of liquid pesticide spraying.
And there is a sudden shift to spraying small amounts of liquid. In view of this current situation, the present inventors have developed an inorganic carrier,
Contains active ingredients at high concentrations without containing organic solvents,
In addition, we conducted extensive research into formulations that exhibit low viscosity and excellent fluidity, and can be applied as is or diluted at low magnifications to spray small amounts or small amounts of liquid. As a result, when active agricultural ingredients are dispersed and stabilized using an aqueous dispersion in which solid particles made of a polymer obtained by polymerizing monomers are colloidally dispersed in the presence of a hydrophilic polymer, the viscosity is low. Excellent fluidity,
Furthermore, the inventors have discovered that a new formulation of agricultural chemicals can be obtained that contains active ingredients at high concentrations and is easily diluted, thus completing the present invention. That is, the present invention provides, in the presence of a hydrophilic polymer,
This is a liquid agricultural chemical in which an agricultural chemical active ingredient is dispersed in an aqueous dispersion of particles made of a polymer obtained by polymerizing a hydrophobic monomer. The agrochemical active ingredient that can be used in the present invention described above may be in either powder or liquid form. The particle size of the powder is preferably 200μ or less; if the particle size is too large, the dispersion stability will be poor and sedimentation and deposition will easily occur, which is not preferred. There are a wide variety of pesticide active ingredients, but examples include:
It is as follows. The symbol or name in front of ( ) or [ ] is the common name of the agricultural chemical substance, and the symbol or name in parentheses ( ) or [ ] represents its chemical name. That is, CYAP (0-p-cyanophenyl thiophosphate = 0,0-dimethyl) is an effective phosphorus insecticide.
MEP (0,0-dimethyl thiophosphate = 0-4-nitro-m-tolyl), ECP (0-2, thiophosphate
4-dichlorophenyl=0,0-diethyl), diazinon (0,0-diethyl thiophosphate=0-
2-isopropyl-4-methyl-6-pyrimidinyl), pyridafenethione (thiophosphoric acid 0-2,
3-dihydro-3-oxo-2-phenyl-6-
pyridazinyl = 0,0-diethyl), Marathon [S-1,2-bis(ethoxycarbonyl)ethyl dithiophosphate = 0,0-dimethyl], Dimethoate [0,0-dimethyl dithiophosphate = S-(N
-methylcarbamoylmethyl), isothioate [S-2-(isopropylthio)ethyl dithiophosphate = 0,0-dimethyl], DMTP (S-2-methoxy-5-oxo-1,3,4-thiadiazolin-4 dithiophosphate) -ylmethyl=0,0-dimethyl), DDVP(2,2-dichlorovinyl phosphate=
dimethyl), EPN (phenylphosphonothionic acid 0
Carbamate insecticides such as NAC (1-naphthyl methylcarbamate), MTMC (methylcarbamate m
-tolyl), BPMC (methyl carbamic acid 0-sec
natural insecticides such as pyrethrin, rotenone, etc. As an acaricide, CPCBS (p-chlorobenzenesulfonic acid p-
chlorophenyl), chlorpropylate (p,
p'-isopropyl dichlorobenzilate), fenisopromolate (p,p'-isopropyl dibromobenzilate), BPPS [2-(p-tert-butylphenoxy)cyclohexyl propynyl sulfite],
Amitraz [N-methyl-bis(2,4-xylyliminomethyl)amine], etc., as a nematocide
EDB (1,2-dibromoethane), EDC (1,2-
dichloroethane), DCIP [bis(2-chloro-1
-methyl ethyl) ether], maneb [ethylene bis(dithiocarbamic acid) manganese], polycarbamate [bis(dimethyl dithiocarbamic acid) ethylene bis(dithiocarbamic acid) dizinc], thiram [bis(dimethyl thiocarbamoyl) disulfide], TPN (tetrachloroisophthalonitrile) as an organic chlorine disinfectant, fusaride (4,5,6,7-tetrachlorophthalide), etc., IBP as an organic phosphorus disinfectant
(S-benzyl thiophosphate = 0,0-diisopropyl), EDDP (0-ethyl dithiophosphate = S, S
- Diphenyl), PCNB as other fungicide
(pentachloronitrobenzene), eclomesol (5-ethoxy-3-trichloromethyl-1,2,
4-thiadiazole), captan [N-(trichloromethylthio)-4-cyclohexene-1,2
-dicarboximide], phenazine oxide (phenazine 5-oxide), CNA (2,6-dichloro-4-nitroaniline), anilazine [2,4
-dichloro-6-(0-chloroanilino)-1,
3,5-triazine], thiophanate methyl [4,4'-0-phenylenebis(3-thioallophanoic acid) dimethyl], isoprothiolane (1,3
-dithiolane-2-ylidenemalonate diisopropyl), fluorimide [N-(P-fluorophenyl)-dichloromaleimide], etc., as herbicides,
MCP (4-chloro-0-tolyloxyacetic acid ethyl ester), DNBP (2-sec-butyl-4,6-
dinitrophenol), NIP (2,4-dichlorophenyl P-nitrophenyl ether), MCC
(methyl 3,4-dichlorocarbanilide), vernalate (S-propyl dipropylthiocarbamate), molinate (S-ethyl hexahydro-1H-azepine-1-carbothioate), DCPA (3',
4'-dichloropropionanilide), butachlor [2-chloro-2',6'-diethyl-N-(butoxymethyl)acetanilide, DCMU [3-(3,
4-dichlorophenyl)-1,1-dimethylurea], simazine [2-chloro-4,6-bis(ethylamino)-1,3,5-triazine], terbacil (3-tert-butyl-5- chloro-6-methyluracil), DBN (2,6-dichlorobenzonitrile), MDBA (3,6-dichloro-2-methoxybenzoic acid dimethylamine salt), ACN (2-amino-3-chloro-1,4 -naphthoquinone), acephenone (4'-tert-butyl-2', 6'-dimethyl-3', 5'-dinitroacetophenone), etc.; -hydroxycoumarin], bisthiosemi [1,1'-methylenebis(thiosemicarbazide)], indolebutyric acid [4-(3-indolyl)butyric acid], α-naphthylacetamide (1-naphthaleneacetamide), 6
-(N-benzylamino)purine, etc., β-naphthol, cycloheximide, as a repellent and attractant,
Tetrahydrothiophene, diallyl sulfide,
Eugenol (4-allyl-2-methoxyphenol), etc., and can be widely applied to carbamate systems, etc., which have conventionally been difficult to emulsify. These pesticide active ingredients can be applied alone or in combination of two or more. The aqueous dispersion of particles made of the polymer used in the liquid agricultural chemical of the present invention is obtained by polymerizing a hydrophobic monomer in a hydrophilic polymer solution. This is an aqueous dispersion of a fine particulate polymer of a hydrophobic monomer obtained by polymerizing the hydrophobic monomer in an aqueous medium in which the monomer is dissolved or suspended in a finely dispersed state. The particle size of particles made of such polymers is approximately that of
It is preferable that 80% or more is 0.3μ or less, especially
It is preferably in the range of 0.15 to 0.05μ. Aqueous dispersions containing a large amount of particles with a particle size of more than 0.3μ may initially disperse agricultural chemical active ingredients, but their retention stability is not as good as shown above, especially when using powdered agricultural chemical active ingredients. In this case, particles tend to settle, accumulate, or float in a relatively short period of time. Furthermore, when a so-called water-soluble polymer solution (generally with a particle size of 0.005μ or less), in which the polymer is completely dissolved in water at the molecular level, is applied to agricultural chemicals, the dispersibility is extremely poor and the solution becomes paste or pudding-like. Pesticides with favorable fluidity cannot be obtained. The hydrophilic polymer in the present invention exhibits protective colloidal properties and surface activity when a hydrophobic monomer is polymerized in the presence of the hydrophilic polymer, thereby stabilizing the polymerization system.
There are no particular limitations on the composition, manufacturing method, etc., as long as it provides the desired colloidal aqueous dispersion of fine polymer particles. Here, a hydrophilic polymer is a polymer that has an affinity for water, and is preferably a water-soluble polymer that can be dissolved in water. It may be in a so-called hydrosol state. The general composition of such hydrophilic polymers is a carboxyl group and its salt as an anionic group,
Sulfonic groups and their salts, sulfuric acid ester groups, phosphoric acid ester groups, etc. Nonionic groups such as hydroxyl groups, ether groups, amide groups, etc. Cationic groups such as amino groups, imino groups, tertiary amino groups, quaternary ammonium groups It has one or more types of hydrophilic groups such as,
If necessary, it has a hydrophobic group such as an alkyl group, phenyl group, or alkylphenyl group, and has a molecular weight of 1000 to 100000.
Applicable to some extent. Preferred hydrophilic polymers include alkali-neutralized salts of copolymers obtained by copolymerizing unsaturated carboxylic acids with other monomers; 1 such as acrylic acid, methacrylic acid, maleic acid, fumaric acid, itaconic acid, crotonic acid, etc.
Acrylic acid alkyl ester, methacrylic acid alkyl ester, acrylic acid hydroxyalkyl ester, methacrylic acid hydroxyalkyl ester, vinyl sulfonic acid, allyl sulfonic acid, methallyl sulfonic acid, styrene sulfonic acid, acrylamide-2-methylpropanesulfone acid, acrylamide, methacrylamide, dimethylacrylamide, N-methylol acrylamide, diacedon acrylamide, styrene,
A copolymer with one or more copolymerizable monomers such as vinyltoluene, vinylpyrrolidone, vinyl ether, vinyl acetate, vinyl chloride, vinylidene chloride, ethylene, propylene, butadiene, and isobutylene, ammonium hydroxide, sodium hydroxide, etc. It is a copolymer made water-soluble by neutralizing it with an inorganic alkali such as potassium hydroxide, or an organic amine such as dimethylamine, monoethanolamine, or morpholine. The copolymerization ratio of the above-mentioned unsaturated carboxylic acid and other monomers varies depending on the type of monomer, but the former is generally about 7 to 60 mol%. It can give activation. Although these are normally called water-soluble polymers, they do not necessarily need to have complete solubility at the molecular level depending on their composition, manufacturing method, etc., and are so-called hydrosols that are dispersed in colloidal form by dissociation of carboxyl groups. As mentioned above, it may be possible to be in the state of . In addition, examples of hydrophilic polymers that can be used in the present invention include hydrochlorides such as dimethylaminoethyl acrylate and dimethylaminoethyl methacrylate;
Tertiary salts such as sulfates, nitrates, acetates, and methyl chloride, ethyl chloride, methyl bromide, benzyl chloride, etc.4
Examples include homopolymers of polyester salts, copolymers with copolymerizable monomers, monopolymers or copolymers of vinylpyridine, and cationic hydrophilic polymers such as polyethyleneimine. In addition, nonionic hydrophilic polymers such as acrylamide, vinylpyrrolidone allyl alcohol, methallyl alcohol alone or as copolymers, polyvinyl alcohol, polypropylene glycol, polyoxyethylene polyoxypropylene block polymer, naphthalene sulfonic acid formalin condensate, lignin Sulfonic acid, etc., cellulose derivatives such as carboxymethyl cellulose, methyl cellulose, hydroxyethyl cellulose, hydroxypropyl cellulose, gums such as guar gum, locust bean gum, xanthan gum, casein,
Examples include sodium alginate. In addition to the above-mentioned hydrophilic polymers, polyethylene glycol can be mentioned as a particularly preferred hydrophilic polymer from the viewpoint of the fluidity of the obtained liquid agricultural chemical, the wide applicable PH range, and economic efficiency. The molecular weight of such polyethylene glycol is preferably 1000~
100,000, particularly preferably about 5,000 to 30,000. Similarly to polyethylene glycol, particularly preferred hydrophilic polymers include modified polyvinyl alcohols modified by the introduction of sulfone groups and/or carboxyl groups. The above-mentioned modified polyvinyl alcohol may contain a sulfone group and/or a carboxyl group, and may form an aqueous liquid due to its hydrophilicity, and there are no particular limitations on its copolymerization composition, polymerization method, manufacturing method, etc. A method for introducing a sulfone group into polyvinyl alcohol by copolymerizing a monomer having a sulfone group is simple and preferable. Examples of such monomers include vinyl sulfonic acid, allyl sulfonic acid,
Examples include metaallylsulfonic acid, styrenesulfonic acid, acrylamide-2-methylpropanesulfonic acid, and alkali salts thereof, such as sodium salt, potassium salt, and lithium salt. Particularly preferred are sodium salts. The copolymerization ratio of these sulfone group-containing monomers is preferably 0.5 to 20 mol%, and particularly preferably 1 to 10 mol%. In order to produce modified polyvinyl alcohol, a method of copolymerizing the above-mentioned sulfone group-containing monomer and vinyl acetate and saponifying the copolymer by a conventional method is industrially advantageous and preferred. There are no particular restrictions on the degree of saponification of modified polyvinyl alcohol; partial saponification,
Either complete saponification is acceptable, but saponification degree is usually 70.
Particularly preferred are mol % or more, preferably 80 mol % or more. The preferred degree of polymerization range is the same as that for polyethylene glycol. Modified polyvinyl alcohol having a sulfone group can also be copolymerized with a hydrophobic monomer within a range that does not impair hydrophilicity. Examples of the hydrophobic monomer include acrylic acid alkyl ester, methacrylic acid alkyl ester, styrene, vinyltoluene,
Examples include acrylonitrile, vinyl chloride, vinylidene chloride, and olefins such as ethylene, propylene, butadiene, and isobutylene. Furthermore, hydrophilic monomers having hydroxyl groups, carboxyl groups, ether groups, amide groups, etc. can also be used. As the polymerization method, solvent-free polymerization or solution polymerization using alcohol or the like is simple and preferred. For example, JP-A-51-
It can also be produced by the method disclosed in No. 3383, No. 56-98205. For introducing carboxyl groups into polyvinyl alcohol, a method of copolymerizing monomers having carboxyl groups is simple and preferred. Such monomers include the aforementioned unsaturated carboxylic acids, such as acrylic acid, methacrylic acid, maleic acid, fumaric acid, itaconic acid, crotonic acid, etc., and their alkali salts, such as sodium salts, potassium salts, lithium salts, etc. . Particularly preferred are sodium salts. The preferred ranges of the copolymerization ratio of these monomers having a carboxyl group, the degree of saponification of vinyl acetate, and the degree of polymerization are the same as those for the modified polyvinyl alcohol having a sulfone group. In addition, other monomers can be introduced by copolymerization, as is the case with modified polyvinyl alcohol having a sulfone group, but especially fatty acid vinyl esters having 6 or more carbon atoms, alkyl vinyl ethers having 6 or more carbon atoms, and carbon atoms Copolymerization of α-olefins having an α-olefin of 6 or more is preferable in order to stably produce an aqueous colloidal dispersion of the polymer. The manufacturing method can be easily carried out by the method disclosed in Japanese Patent Application Laid-Open No. 54-135882. A hydrophobic monomer is added to the hydrophilic polymer solution as described above and polymerized to form an aqueous dispersion of colloidal solid particles. Hydrophilic polymers are grafted and adsorbed onto the outer side of the polymer, the so-called shell part, and are stabilized by steric repulsion by the polymer chains. It is thought that In order to bring about this steric repulsion, it is desirable that the hydrophilic polymer has a somewhat large molecular weight.
It is 1000 or more, preferably 5000 or more. If the molecular weight is larger than necessary, the viscosity of the hydrophilic polymer solution will increase, making it difficult to continue the polymerization stably, which is not preferable. Since the monomer added later is thought to form the core of the colloid through polymerization, it is necessary that the monomer itself is hydrophobic. There are no particular limitations on the hydrophobic monomer, but specific examples include alkyl acrylate, alkyl methacrylate, dimethylacrylamide, n-butoxyacrylamide, acrylonitrile, styrene, vinyltoluene, vinyl acetate, vinyl chloride, and chloride. Examples include vinylidene, ethylene, propylene, butadiene, and isobutylene.
Furthermore, a small amount of water-soluble monomers such as unsaturated carboxylic acids and their salts such as acrylic acid and methacrylic acid, acrylamide, methacrylamide, and hydroxyethyl acrylate may be copolymerized within a range that does not impair the stability of the system. . An outline of the production of a colloidal aqueous dispersion of polymer particles will be described below. A hydrophilic polymer solution is prepared to a concentration of 5 to 50% by weight.
The viscosity at this time is preferably about 2000 CPS or less. If the viscosity of the system is high, mixing will be non-uniform, and if a monomer is added later and polymerized, a coagulated product will be formed, making it impossible to continue the polymerization stably. In order to maintain the stability of the polymerization system, a small amount of anionic, nonionic, or cationic emulsifier may be used in combination. In addition, methanol, ethanol,
A small amount of a hydrophilic solvent such as isopropyl alcohol or acetone may be present. The temperature at which the hydrophilic polymer solution is polymerized (usually 40~
100℃). While stirring, monomers mainly consisting of hydrophobic monomers and a polymerization initiator are added to initiate and continue polymerization. The weight ratio of the hydrophilic polymer to the monomer to be polymerized later is preferably about 1/10 to 10/1, more preferably 1/3 to 3/1. If the amount of hydrophilic polymer used is small, the retention stability of the agricultural chemical active ingredient in the colloidal dispersion produced will decrease, and if it is too large, even if the agricultural chemical active ingredient is dispersed, the viscosity will be high or it will become paste-like. This results in poor liquidity. The polymerization initiator may be one for radical polymerization, and water-soluble potassium persulfate, ammonium persulfate, tert-butyl hydroperoxide, azobiscyanovaleric acid, and the like are preferably used. After initiation of polymerization, a colloidal aqueous dispersion is obtained by continuing and treating in a conventional manner. The aqueous dispersion thus obtained is considered to form a hydration layer having hydrophilic groups in the shell portion, as described above. It is inferred that active pesticide ingredients are adsorbed and attached to this hydration layer with steric repulsion, and move smoothly through the system together with colloidal particles, resulting in a pesticide with excellent fluidity and low viscosity. Ru. The outline of the method for producing the agricultural chemical of the present invention will be described below. 10 to 50% of the colloidal aqueous dispersion of the polymer of the present invention.
Adjust to weight % concentration. If restrictions on viscosity are acceptable during work, it may be 50% by weight or more. The viscosity at this time is 10~10000cps, especially 10~
A viscosity of 1000 cps is preferred in terms of workability. If there is a preferable PH range in terms of stability depending on the type of agricultural chemical active ingredient to be dispersed, the PH of the colloidal aqueous dispersion of the polymer is adjusted in advance to a predetermined PH range with an acid or alkali. Among the hydrophilic polymers, the aforementioned polyethylene glycol and modified polyvinyl alcohol having a sulfone group and/or a carboxyl group are particularly preferred in terms of maintaining a stable colloidal aqueous dispersion over a wide pH range. Pesticide active ingredients can be applied in either solid or liquid form, but in the case of solids, it is preferable to crush them into powder.
The particle size should be 200μ or less. 100 parts of the colloidal aqueous dispersion (parts by weight:
(same below) is efficiently stirred and the pesticide active ingredient is 20~
Gradually add 300 parts, preferably 20 to 150 parts, and continue stirring until uniform mixing is achieved. In this case, an antifoaming agent may be added to the colloidal aqueous dispersion in advance, if necessary. Agrochemicals with excellent fluidity of 50 to 10,000 cps can be obtained by stirring for about 30 minutes to 1 hour. If the viscosity is too high, adjust the concentration and amount of the colloidal aqueous dispersion and the amount of the pesticide active ingredient to reduce the viscosity. Despite the high concentration of 15 to 60% by weight, the resulting pesticide exhibits excellent fluidity, good storage stability, and is easy to dilute with water. To improve the storage stability of pesticides, we use sodium polyacrylate, ammonium polyacrylate, carboxyl methyl cellulose, hydroxyethyl cellulose, methyl cellulose, sodium lignin sulfonate, polyvinyl alcohol, polyethylene glycol, polypropylene glycol, gelatin, starch, casein, A small amount of water-soluble polymers such as sodium alginate, guar gum, locust bean gum, and xanthan gum may be added. If the amount added is too large, the stability of the system will be impaired, so care must be taken in this regard. Furthermore, a small amount of a surfactant, a polymer emulsion, and an organic solvent may be mixed if necessary. According to the present invention, it is possible to spray small or small amounts of carbamate pesticides, etc., which were conventionally difficult to emulsify, avoid problems caused by organic solvents in emulsions, and have good adhesion to plants. It is possible to obtain a new form of pesticide, and it can be said that its industrial value is extremely large. Next, the present invention will be specifically explained by showing experimental examples, examples, and comparative examples. Experimental example 1 kg of the hydrophilic polymer aqueous liquid shown in Table 1 below was placed in a stirrer, a reflux condenser, a polymerization initiator aqueous solution dropping tube,
It was placed in a glass round bottom flask equipped with a monomer feed tube. After raising the temperature to 80°C, 20 g of a 5% by weight aqueous ammonium persulfate solution containing the monomer composition shown in Table 1 was added dropwise under stirring to initiate polymerization, and the continuous addition was completed in 2 hours. After the addition was completed, the internal temperature was maintained at 80° C. for another hour to consume the remaining monomer. After cooling to room temperature, coagulated matter and impurities were removed using a 100-mesh nylon net to obtain a pale yellow, transparent white colloidal aqueous dispersion (dispersion of the present invention). The properties of the obtained colloidal aqueous dispersion are also shown in Table 1.

【table】

[Table] Example 1 706g of colloidal aqueous dispersion A shown in Table-1
was transferred to 3 beakers and water was added to make 1 kg. The concentration of the prepared aqueous solution will be 25%. Stirring was carried out at a rotation speed of 300 rpm using a stirrer equipped with 4 blades 7 cm long. While stirring, 800 g of NAC (1-naphthyl methylcarbamate) powder was gradually added over 3 minutes.
The NAC powder was dispersed and mixed smoothly, and the mixture became almost homogeneous 10 minutes after the addition was completed. Stirring was further continued for 30 minutes after the addition was completed to obtain a white homogeneous liquid pesticide. Although this pesticide contained a high NAC concentration of 44.4%, it had a low viscosity of 1700 cps and had good workability. water dilutable,
The stability (see note in Table 2) was also good, making it suitable as an aerial spraying pesticide. Examples 2-24 Agrochemicals were produced according to Example 1 with the compositions shown in Table-2. When an antifoaming agent was added, the foam disappeared and the mixture could be mixed more smoothly. Various types of liquid and powder,
A pesticide that can be applied as an active ingredient of pesticides and has excellent low viscosity and fluidity was obtained. All had good water dilutability and stability, and were suitable as agricultural chemicals for aerial spraying.

【table】

[Table] Comparative Examples 1 to 6 A test according to Example 1 was conducted using the liquid shown in Table 3 as a liquid for dissolving or mixing an agricultural chemical active ingredient. The results are shown in Table-3.

[Table] Notes on Table-3)
1) ANa: Sodium acrylate
2) ANH ₄ : Ammonium acrylate
3) MLANa: Sodium maleate The following can be said from this Table-3. (1) Even when the agrochemical active ingredient is dispersed and mixed using a completely dissolved aqueous polymer solution (Comparative Examples 1 to 4), the viscosity increases during preparation, loses fluidity, and solidifies into a paste or pudding. And then the next day,
It was found that solidification progressed and it was unsuitable as an agricultural chemical. (2) In Comparative Example 5, in which the pesticide active ingredient was added to the emulsion, the dispersion had a low viscosity and good miscibility, and became a uniform white dispersion immediately after stirring, but the retention was poor and the NAC was reduced the next day. It is difficult to say that it is ideal because it has settled and accumulated. (3) When a nonionic surfactant is used (Comparative Example 6), it solidifies the next day, similarly to Comparative Examples 1 to 4, and is inappropriate.

Claims (1)

[Claims] 1. A liquid agrochemical in which an agrochemical active ingredient is dispersed in an aqueous dispersion of particles made of a polymer obtained by polymerizing a hydrophobic monomer in the presence of a hydrophilic polymer.