JP2000044402A - Granular agrochemical composition and its production - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a granular agrochemical composition having the floating property that floats in a short time with finely keeping the water surface spreading property and the disintegration by including an agrochemical active component, a water-soluble carrier, a specific substance, a surfactant and thiourea. SOLUTION: The objective composition is obtained by mixing (A) an agrochemical active component, e.g. a microbicide, an insecticide, a herbicide or the like, (B) 20-99.8 wt.% of a water-soluble carrier, (C) 0.01-30 wt.% of a film-forming material having a slower solubility rate in water than the component B, (D) 0.1-30 wt.% of a surfactant and (E) 0.5-20 wt.% of thiourea. As the component B, potassium chloride or the like is preferably used. As the favorable component C, a heteropolysaccharide gum, preferably xanthan gum, rhamzan gum, wellan gum or the like, is illustrated. As the component D, sodium dioctylsulfosuccinate, sodium salt of an alkylnaphthalene sulfonic acid formalin condensate or the like is favorable.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to paddy fields, rush fields,
The present invention relates to a water-surfacing particulate pesticidal composition that efficiently controls pests, weeds, and the like that mainly occur in places where water is present, such as wetlands, by applying it to the surface of water. More specifically, the present invention relates to a water-surfacing pesticidal particulate composition which can improve the floating property and can be dispersed more widely and uniformly.

[0002]

2. Description of the Related Art A buoyant composition which releases an active ingredient while spreading a water surface is disclosed in Japanese Patent Publication No. Sho 63-30281. Here, a water-soluble suspension and a water-surface floating collapsible composition in which a film-forming substance having a lower dissolution rate in water than the water-soluble carrier is formed in a granular form together with the active ingredient are shown.
When applied, they are once submerged in water, then float on the surface of the water, disintegrate while spreading, and release small particles containing the active ingredient. However, the collapsed particle diameter is large, and the spreadability and levitation are insufficient, and improvement has been demanded. JP-A-10-17410 discloses a method of extending an active ingredient by adding a sulfosuccinic acid alkyl ester salt or a naphthalene sulfonate condensate. However, there is a problem that if the amount of these additives is increased in order to improve the spreadability, the buoyancy deteriorates. In addition, there was a problem that the levitation property deteriorated by enlarging the manufacturing scale.

[0003]

SUMMARY OF THE INVENTION Accordingly, the present inventors
A method for producing a water-surfacing pesticide granular composition that floats in a short time while maintaining good water-surface spreadability and disintegratability, and a method for producing a water-surfacing pesticide granular composition that has a small change in buoyancy due to differences in production scale. It was intended to be developed.

[0004]

Means for Solving the Problems As a result of intensive studies to solve the above problems, the pesticidal granular composition having the following composition and the floating property of the pesticidal granular composition produced by the production method are improved. The present invention has been completed. [1] A pesticidal granular composition containing the following components (a), (b), (c), (d) and (e).

(A) Agrochemical active ingredient (b) Water-soluble carrier (c) Film-forming substance whose dissolution rate in water is lower than that of water-soluble carrier (b) (d) Surfactant (e) Thiourea [2] ] A pesticide package preparation obtained by packaging the granular pesticide composition according to [1] with a water-soluble film. [3] The following components (a), (b), (c) and (d)
A kneaded product obtained by mixing a part of the components other than (c) and (c), adding water, kneading the mixture uniformly, adding the remaining components and kneading the mixture again when producing the pesticidal granular composition containing A method for producing a pesticidal granular composition, comprising forming a granule into a granular form and drying.

(A) Agrochemical active ingredient (b) Water-soluble carrier (c) Film-forming substance whose dissolution rate in water is lower than that of water-soluble carrier (b) (d) Surfactant [4] (b) and (C) is mixed, water is added and uniformly kneaded, (a), (d) and, if necessary, other auxiliaries are added, and the kneaded material is again kneaded, and then granulated and dried. [3] The method for producing a pesticidal granular composition according to [3]. [5] A method for producing an agricultural chemical package preparation, which comprises producing the agricultural chemical particulate composition by the production method according to [3] or [4], and then packaging the agricultural chemical particulate composition with a water-soluble film.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION The pesticidal active ingredient (a) used in the pesticidal granular composition of the present invention is preferably a poorly water-soluble or water-insoluble one. It may be solid or liquid as long as it has an activity of controlling pests by water application. One or more pesticidal active ingredients such as fungicides, insecticides and herbicides can be contained.

Examples of herbicides include pyrazosulfuron ethyl (pyrazosulfuron ethyl / generic name), halosulfuron methyl (halosulfuron methyl / generic name), bensulfuron methyl (bensulfuron methyl / generic name), imazosulfuron (imazosulfuron / generic name), Azimsulfuron (azimsulfuron / generic name), cinosulfuron (cinosu
lfuron / generic name), cyclosulfa
muron / generic name) and ethoxysulfuron
furon (generic name), sulfonylurea herbicides, esprocarb (generic name), benthiocarb (ben)
carbamate herbicides such as thiocarb / generic name, molinate / generic name, dimepiperate / generic name and pyributicarb / pyributicarb / generic name, mefenacet (mefenacet / generic name), butachlor (butachlor / generic name) ), Pretilachlor (pretilachlor / generic name), tenylchlor (thenylchlor / generic name), bromobutide
Acid amide herbicides, such as ethobenzanide (generic name) and etobenzanid (generic name); urea herbicides, such as dimron (dymron / generic name) and cumyluron (cumyluron / generic name); bentazone (bentazone / generic name) And diazine herbicides such as bentazone, 2,4-D
(Generic name), 2,4-D salt, 2,4-D ester,
MCP (generic name), salt of MCP, ester of MCP, M
Phenoxy acid herbicides such as CPB (generic name), MCPB salt, MCPB ester, phenothiol (MCPA-thioethyl / generic name), clomeprop (clomeprop / generic name) and naproanilide (naproanilide / generic name), oxadiazon ( oxadiazon / generic name, pyrazolate (pyrazolate / generic name), pyrazoxifene (pyra
zoxyfen / generic name), benzofenap /
Diazole herbicides such as oxadiargyl (generic name) and oxadiargyl (generic name);
triazine herbicides such as thametryn / generic name and simetryn / generic name, piperophos
os / general name), anilofos (anilofos / generic name), butamifos (butamifos / generic name) and benzulide (bensu)
lide / generic name) and dithiopyr (di)
thiopyr / common name) and pyriminobac-methyl (p
aromatic carboxylic acid herbicides such as yriminobac methyl (generic name), CNP (generic name), chloromethoxynil (chlorm)
ethoxynil / generic name, cyhalofop
diphenyl ether herbicides such as butyl / bifenox / bifenox / generic name, and cafenstrole / cafenstrole / generic name, pentoxazone / pentoxazone / generic name, indanofan
an / generic name), oxaziclomefone /
Generic name), fentrazamide (generic name), butenachlor (butenachlor / generic name), AC
Other herbicides such as N (generic name), benzobicyclon (benzobicyclon / test name), benfresate (benfuresate / generic name) and cymmethylin (cimmethylin / generic name).

As the insecticide, for example, MPP (generic name),
MEP (generic name), pirimiphos methyl
hyl / common name), diazinon (diazinon / common name),
Pyridafenthion (pyridaphenthion / generic name), chlorpyrifosmethyl (chlorpyrifos methyl / generic name), bamidothion (vamidothion / generic name), marathon (malathion / generic name), PAP (generic name), dimethoate (dimethoate / generic name), ethylthiomethone ( di
sulfoton / generic name), PMP (generic name), monocrotophos (generic name), BRP (generic name), C
VMP (generic name), dimethylvinpho
s / general name), propaphos (propaphos / generic name), DE
Organophosphorus pesticides such as P (generic name) and EPN (generic name), NAC (generic name), MTMC (generic name), MIP
C (generic name), BPMC (generic name), PHC (generic name), XMC (generic name), methomil (methomyl / generic name), thiodicarb (thiodicarb / generic name), bendiocarb (bendiocarb / generic name), Carbosulfan (common name) and benfracalp (benfu
carbamate insecticides such as racarb / generic name; nereistoxin insecticides such as cartap / generic name, thiocyclam / bensultap / generic name; buprofezin
ezin / generic name) and tebufenozide /
Insect growth regulators such as ethofenprox (generic name) and cycloprothrin (cyc
Examples include pyrethroid insecticides such as loprothrin / generic name and other insecticides such as fipronil / generic name and imidacloprid.

Examples of the germicide include copper germicides such as inorganic copper agents, organochlorine germicides such as fthalide (generic name), and organophosphorus germicides such as IBP (generic name) and EDDP (generic name). , Fungicides such as dicarboximides such as iprodione (generic name), mepronil (meprnil)
onil / generic name, flutolanil (flutolanil / generic name), teclophthalam (tecloftalam / generic name), penciclone (pencycuron / generic name), metalaxyl (meta
acid amide fungicides such as laxyl / generic name, thifluzamide (thifluzamide / generic name), diclocymet (dicrocymet / generic name), flametopil (furametpyr / generic name) and carpropamide (carpropamide / generic name), blasticidin S ( blasticidin S / generic name, kasugamycin / generic name, polyoxin (polyo
xins / generic name), antibiotic fungicides such as validamycin A / generic name and spinosad (generic name), azoxystrobin (azoxystrobin / generic name), kresoxim methyl / metominostrobin Methoxyacrylate fungicides such as (metominostrobin / generic name), acetamipride (ac
etamiprid / common name) and clothianidin (chlothian)
Nitromethylene fungicides such as idine / generic name) and organic arsenicals, diclomezine / diclomezine,
Ferimzone (ferimzone / generic name), probenazole (probenazole / generic name), isoprothiolane (isoprot
hiolane / generic name), tricyclazole
/ Generic name), pyroquilon (pyroquilon / generic name), iminoctadine acetate (guazatine / generic name), chlorfenapyr (chlorfenapyr / generic name), mepanipyrim (mepa
nipyrim / generic name), oxolinic acid
/ Generic name) and acibenzolar-S-methyl (CG-213)
/ Generic name) and the like.

[0011] Examples of plant growth regulators include, for example, uniconazole (uniconazole / common name) and inabenfide (i
nabenfide / common name) and the like.

It has been found that the pesticidal granular composition of the present invention contains thiourea (e) to improve the floating property. The effect of improving the buoyancy of thiourea is a powerful effect that is not found in, for example, urea, which is a related compound. In this case, the addition amount of thiourea is usually 0.5 to 20% by weight, preferably 0.5 to 10% by weight of the pesticidal granular composition.

Specific examples of the water-soluble carrier (b) that can be used in the granular pesticidal composition of the present invention include ammonium sulfate, ammonium nitrate, ammonium chloride, potassium chloride, ammonium bicarbonate, sodium sulfate, sodium borate, sodium carbonate, and modified starch. And powders such as sugar, and these may be used alone or in combination.
It is not limited to these as long as it is a water-soluble powder.
Preferred water-soluble carriers include potassium chloride. These are usually from 20 to 99.% based on the pesticidal granular composition.
8% by weight, preferably 50-98% by weight, is used.

Specific examples of the film-forming substance (c) which can be used in the pesticidal granular composition of the present invention include heteropolysaccharide gums such as xanthan gum, lanthanum gum and welan gum, gum arabic, dextrin, sodium salt of carboxymethyl cellulose, sodium alginate, Examples include, but are not limited to, modified starch, polyvinyl alcohol, polyethylene oxide, sodium silicate, potassium silicate, and sodium polyacrylate, and one or more of these can be used. From the viewpoint of improving the floating property of the pesticidal granular composition, preferred film-forming substances include heteropolysaccharide gums, more preferably xanthan gum, lanthanum gum and welan gum, and still more preferably lanthanum gum. These are usually 0.01 to 30% by weight based on the pesticidal granular composition,
Preferably, 0.1 to 10% by weight is used.

In the present invention, the surfactant (d) for improving the disintegration and dispersibility of the granular pesticidal composition on the water surface is not particularly limited. Examples of the nonionic surfactant include polyoxyethylene alkyl (C _12). to ₁₈₎ ether, ethylene oxide adducts of alkyl naphthol, polyoxyethylene (mono or di) alkyl (C ₈ ~ ₁₂₎ phenyl ether, polyoxyethylene (mono or di) alkyl (C ₈ ~ ₁₂₎ phenyl ether formalin Condensate, polyoxyethylene (mono, di or tri) phenyl phenyl ether, polyoxyethylene (mono, di or tri) benzyl phenyl ether, polyoxypropylene (mono, di or tri) benzyl phenyl ether, polyoxyethylene (mono) , Di or tri) styryl phenyle Ter, polyoxypropylene (mono, di or tri) styryl phenyl ether, polymer of polyoxyethylene (mono, di or tri) styryl phenyl ether, polyoxyethylene polyoxypropylene block polymer, polyoxyethylene polyoxypropylene alkyl (C _12-18) ether, polyoxyethylene polyoxypropylene alkyl (C ₈ ~ ₁₂₎ phenyl ether, polyoxyethylene polyoxypropylene fatty acid (C _12-18) esters, polyoxyethylene bisphenyl ether, polyoxyethylene resin acid esters , polyoxyethylene fatty acid (C ₁₂ ~ ₁₈₎ monoesters, polyoxyethylene fatty acid (C ₁₂ ~ ₁₈₎ diesters, polyoxyethylene sorbitan fatty acid (C ₁₂ ~ ₁₈₎
Esters, glycerol fatty acid ester ethylene oxide adduct, castor oil ethylene oxide adduct, hydrogenated castor oil ethylene oxide adduct, alkyl (C ₁₂ ~
₁₈ ) Amine ethylene oxide adduct and fatty acid (C
₁₂ to ₁₈ ) Polyethylene glycol type surfactants such as amide ethylene oxide adducts, for example, glycerol fatty acid ester, polyglycerin fatty acid ester, pentaerythritol fatty acid ester, sorbitol fatty acid (C
_12-18) ester, sorbitan fatty acid (C _12-18) ester, sucrose fatty acid esters, polyhydric alcohol type surfactants such as polyhydric alcohol alkyl ethers and fatty acid alkanolamides, such as acetylene glycol, acetylene alcohol, acetylene glycol Examples include acetylene-based surfactants such as ethylene oxide adducts and ethylene oxide adducts of acetylene alcohol, and alkyl glycosides.

Examples of the anionic surfactant include, for example,
Polyacrylate, polymethacrylate, polymale
Phosphates, maleic acid and olefins (eg isobutylene
And diisobutylene, etc.), acrylic
Salt of copolymer of acid and itaconic acid, methacrylic acid and ita
Salt of copolymer of conic acid, copolymer of maleic acid and styrene
Salt, a salt of a copolymer of acrylic acid and methacrylic acid,
Of copolymers of acrylic acid and methyl acrylate
Salt, salt of copolymer of acrylic acid and vinyl acetate,
Salt of copolymer of luic acid and maleic acid, N-methyl-fatty acid
(C₁₂~₁₈) Sarcosinates, resinates and fatty acids
(C₁₂~₁₈) Salts such as salts such as alkyl (C
₁₂~₁₈) Sulfate, polyoxyethylene alkyl
(C₁₂~₁₈) Ethersulfate, polyoxyethylene
Len (mono or di) alkyl (C ₈~₁₂) Phenyle
-Sulfuric acid ester salt, polyoxyethylene (mono or
Is di) alkyl (C₈~₁₂) Phenyl ether polymer
-Sulfuric ester, polyoxyethylene (mono, di-
Or tri) phenylphenyl ether sulfate,
Polyoxyethylene (mono, di or tri) benzyl
Phenyl ether sulfate, polyoxyethylene
(Mono, di or tri) styryl phenyl ether sulfate
Ester salts, polyoxyethylene (mono, di or tri-
Ii) Estersulfate of polymers of styrylphenyl ether
Salt, polyoxyethylene polyoxypropylene block
Sulfates of sulfated polymers, sulfated oils, sulfated fatty acids
Sulfur such as esters, sulfated fatty acids and sulfated olefins
Acid ester salts such as paraffin (C ₁₂~_{twenty two}) Sulfone
Acid salts, alkyl (C₈~₁₂) Benzene sulfonate, a
Lequil (C₈~₁₂) Formalin condensation of benzenesulfonic acid
Of the compound, formalin condensate of cresolsulfonic acid
Salt, α-olefin (C₁₄~₁₆) Sulfonate, dial
Kill (C₈~₁₂) Sulfosuccinate, lignin sulfone
Acid salt, polyoxyethylene (mono or di) alkyl
(C₈~₁₂) Phenyl ether sulfonate, polyoxy
Cyethylene alkyl (C₁₂~₁₈) Ether sulfo
Acid half ester, naphthalene sulfonate,
Or di) alkyl (C₁~₆) Naphthalene sulfonate,
Salt of formalin condensate of naphthalenesulfonic acid, (mono
Or di) alkyl (C₁~₆) Of naphthalenesulfonic acid
Formalin condensate salt, creosote oil sulfonic acid e
Salt of rumarin condensate, alkyl (C₈~₁₂) Diphenyl
Ether disulfonate, Igepon T (trade name), Poly
Styrene sulfonic acid salt and styrene sulfonic acid and meta
Sulfonates such as salts of acrylic acid copolymers, and
For example, alkyl (C₈~₁₂) Phosphate salt, polyoxy
Cyethylene alkyl (C_{1 Two}~₁₈) Ether phosphate ester
Salt, polyoxyethylene (mono or di) alkyl (C
₈~₁₂) Phenyl ether phosphate salt, polyoxy
Ethylene (mono, di or tri) alkyl (C₈~₁₂)
Phosphoric acid ester salt of phenyl ether polymer, polio
Xyethylene (mono, di or tri) phenylphenyl
Ether phosphate salts, polyoxyethylene (mono,
Di or tri) benzyl phenyl ether phosphate
Salt, polyoxyethylene (mono, di or tri) stille
Phenyl ether phosphate, polyoxyethylene
Of (mono, di or tri) styryl phenyl ether
Polymer phosphate salt, polyoxyethylene polio
Phosphate ester salts of xypropylene block polymers, e
Sphatidylcholine, phosphatidylethanolimine
And phosphorus such as condensed phosphate (eg, tripolyphosphate)
Acid ester salts. As the salt here, a
Lucari metal (lithium, sodium and potassium
Etc.), alkaline earth metals (calcium and magnesium)
), Ammonium and various amines (eg,
Luamine, cycloalkylamine and alkanol alcohol
And the like).

Examples of the cationic surfactant include an alkylamine salt and an alkyl quaternary ammonium salt.

Examples of the amphoteric surfactant include betaine type and amino acid type.

Other surfactants include silicone-based surfactants and fluorine-based surfactants.

Among the above surfactants, preferred are sodium alkylnaphthalenesulfonate, sodium ligninsulfonate, sodium dioctylsulfosuccinate and sodium salts of alkylnaphthalenesulfonate formalin condensates, more preferably. Sodium dioctyl sulfosuccinate and sodium salts of alkyl naphthalene sulfonic acid formalin condensates are mentioned. The amount of the surfactant added is not particularly limited, but is usually 0.1 to 30% by weight, preferably 0.5 to 10% by weight, based on the granular agricultural chemical composition.

The granular pesticidal composition of the present invention may contain, if necessary, an organic solvent, an anti-decomposition agent, an antioxidant, a coloring agent and a mineral carrier as other auxiliaries.

Further, the granular composition of the present invention may be packaged in a water-soluble film in a unit of 20 to 200 g, preferably in a unit of 30 to 100 g, for convenience in spraying. Examples of the water-soluble film include polyvinyl alcohol, modified polyvinyl alcohol, carboxymethylcellulose, starch, gelatin, polyvinylpyrrolidone, and mixtures of one or more of polyacrylic acid and salts thereof. Films are preferred.

Next, a preferred method for producing the pesticidal granular composition according to the present invention will be described. First, water is added to some of the components other than the film-forming substance (c) and the component (c) having a lower water dissolution rate than the water-soluble carrier, and the mixture is kneaded. Next, the remaining components are added thereto, and if necessary, water is further added and kneaded again, and the mixture is granulated by a usual granulation method such as extrusion granulation and tumbling granulation, and dried, if necessary. After sieving, the desired pesticidal granular composition is obtained. Part of the components other than (c) to be added first includes the pesticidal active ingredient, the water-soluble carrier, the surfactant,
It may be thiourea or any of the other adjuvants mentioned above, but preferably contains a water-soluble carrier. In addition, a part may be the total amount of one or more specific components or a part of a specific component. If the total amount of the components to be added first is too small, kneading is difficult, and if it is too large, it is difficult to exert the effect of improving the floating property. 20% to 95% by weight of the amount, preferably 50% to 85%
More preferably, it is% by weight.

When thiourea is contained in the pesticidal granular composition, good buoyancy can be obtained by the production according to the above-mentioned method. It is possible to obtain a pesticidal granular composition having excellent levitation and disintegration properties that can sufficiently withstand practical use even if all the raw materials are mixed and kneaded together by a granulation method, for example, and then granulated by a usual granulation method.

[0025]

EXAMPLES Next, examples and test examples of the present invention will be specifically described. However, the present invention is not limited to only these examples and test examples. The following parts all represent parts by weight.

Example 1 Pyrazosulfuron-ethyl 1
5 parts, lanthanum 1 part, dioctyl sodium sulfosuccinate 1 part, thiourea 2 parts, potassium chloride 8
One part was mixed with a universal mixer (manufactured by Dalton), and an appropriate amount of water was mixed and kneaded. This was granulated using an extrusion-type granulator equipped with a screen having a diameter of 1.0 mm.
To obtain a granular composition.

Example 2 Pyrazosulfuron-ethyl 1
5 parts, lanthanum 0.75 parts, sodium dioctylsulfosuccinate 2 parts, sodium salt of alkylnaphthalenesulfonic acid formalin condensate 3 parts, thiourea
2 parts and 77.25 parts of potassium chloride were mixed with a universal mixer (manufactured by Dalton), and an appropriate amount of water was mixed and kneaded. This was granulated using an extrusion granulator equipped with a screen having a diameter of 1.0 mm, and dried at 50 ° C. to obtain a granular composition.

[Example 3] 0.75 parts of lanthanum,
77.25 parts of potassium chloride were mixed with a universal mixer (manufactured by Dalton), and an appropriate amount of water was added and kneaded. 15 parts of pyrazosulfuron-ethyl, 2 parts of sodium dioctylsulfosuccinate, 3 parts of sodium salt of alkylnaphthalenesulfonic acid formalin condensate, and 2 parts of thiourea were added, and the mixture was further kneaded with a universal mixer (manufactured by Dalton). This was granulated using an extrusion granulator equipped with a screen having a diameter of 1.0 mm, and dried at 50 ° C. to obtain a granular composition.

Comparative Example 1 Pyrazosulfuron-ethyl 1
5 parts, 1 part of lanthanum, 1 part of sodium dioctylsulfosuccinate and 83 parts of potassium chloride were mixed with a universal mixer (made by Dalton), and an appropriate amount of water was mixed and kneaded. This was granulated using an extrusion granulator equipped with a screen having a diameter of 1.0 mm, and dried at 50 ° C. to obtain a granular composition.

Comparative Example 2 Pyrazosulfuron-ethyl 1
5 parts, 1 part of lanthanum and 84 parts of potassium chloride were mixed with a universal mixer (made by Dalton), and an appropriate amount of water was added and kneaded. This was granulated using an extrusion granulator equipped with a screen having a diameter of 1.0 mm, and dried at 50 ° C. to obtain a granular composition.

Comparative Example 3 Pyrazosulfuron-ethyl 1
5 parts, lanthanum 0.75 parts, sodium dioctyl sulfosuccinate 2 parts, sodium salt of alkylnaphthalenesulfonic acid formalin condensate 3 parts, urea 2
And 77.25 parts of potassium chloride were mixed with a universal mixer (manufactured by Dalton), an appropriate amount of water was added and kneaded.
This was granulated using an extrusion granulator equipped with a screen having a diameter of 1.0 mm, and dried at 50 ° C. to obtain a granular composition.

Test Example 1 Water Surface Levitation and Diffusivity Test 200 mg of the granular compositions of Examples and Comparative Examples were placed in a square bag made of a water-soluble film made of polyvinyl alcohol, and heat-sealed to produce a package preparation. On the other hand, radius 50c
Then, water was poured into a water tank having a depth of 4 cm into the water tank, and the package preparation was charged therein, and the floating property on the water surface after 2 hours was examined. The floating property of the granular composition on the water surface was evaluated by a floating rate two hours after the loading (floating rate = number of particles of the floating granular composition / number of particles of the granular composition charged × 100). Also,
The water surface collapse dispersibility of the floating granules was evaluated according to the evaluation criteria shown in Table 1. The results are shown in Table 2.

[0033]

[Table 1] Table 1 ────────────────────────────── Evaluation Water surface collapse 2 hours after the introduction of chemicals Diffusivity ────────────────────────────── ◎ 90% or more of the levitated particles collapsed into microparticles and diffused ○ Levitated 50-90% of the particles are broken down into fine particles and diffused. × Less than 50% of the floating particles are broken down into fine particles and diffused. ────────

[0034]

[Table 2] Table 2 ────────────────────── Test area Flotation rate Water surface collapse and diffusion 性───────── Example 1 100% Example 2 100% Example 3 100% 比較 Comparative Example 1 80% Comparative Example 2 80% × Comparative Example 3 50% ───── ───── ─────────────────As described above, all of the pesticidal granular compositions of the present invention floated completely and were excellent in water surface collapse and diffusion properties.

Test Example 2 Water Surface Levitation Test 50 g of the granular composition of the example was placed in a square bag made of a water-soluble film made of polyvinyl alcohol, and heat-sealed to produce a package preparation. On the other hand, water is poured into a water tank having a radius of 50 cm so as to have a water depth of 4 cm, the package preparation is charged therein, and the time required for all of the supplied pesticide particulate composition to float (referred to as total floating time). evaluated. The results are shown in Table 3.

[0036]

[Table 3] Table 3 ──────────────────────────────── Test area Mixing and kneading method Production scale Total ascent time ─ ─────────────────────────────── Example 2 1 stage 100 g 1.5 hours Example 2 1 stage 3 kg 10 hours Example 3 Two-stage 100 g for 1 hour Example 3 Two-stage 3 kg 3.5 hours As described above, the manufacturing method of Example 3 in which the mixing and kneading is performed in two stages, compared with the manufacturing method of Example 2, reduces the total floating time, improves the floating property, and increases the manufacturing scale. The decrease in levitation was suppressed.

Claims (5)

[Claims] 1. The following components (a), (b), (c),
A pesticidal granular composition containing (d) and (e). (A) Agrochemical active ingredient (b) Water-soluble carrier (c) Film-forming substance whose dissolution rate in water is lower than that of water-soluble carrier (b) (d) Surfactant (e) Thiourea 2. A pesticide package preparation comprising the granular pesticide composition according to claim 1 packaged in a water-soluble film. 3. In producing a pesticidal granular composition containing the following components (a), (b), (c) and (d):
A part of the components other than (c) and (c) are mixed, water is added and uniformly kneaded, the remaining components are added, and the kneaded product is kneaded again, and then formed into granules and dried. Of producing a granular pesticide composition. (A) Agrochemical active ingredient (b) Water-soluble carrier (c) Film-forming substance whose dissolution rate in water is lower than that of water-soluble carrier (b) (d) Surfactant 4. A kneaded product obtained by mixing (b) and (c), adding water and uniformly kneading the mixture, adding (a), (d) and, if necessary, other auxiliaries, and kneading the mixture again. 4. The method for producing a pesticidal granular composition according to claim 3, wherein the composition is formed into a granular form and dried. 5. A method for producing an agricultural chemical package preparation, comprising: producing a granular agricultural chemical composition by the production method according to claim 3 or 4; and packaging the agricultural chemical granular composition with a water-soluble film. .