JPH07233002A - Agrochemical formulation - Google Patents

Abstract

PURPOSE:To provide agrochemical granules or tablets capable of disintegrating while spreading all over a water surface and uniformly distributing agrochemical components all over a paddy field by only locally throwing them in the paddy field. CONSTITUTION:Agrochemical granules or tablets comprising uniformly dispersed (A) agrochemical active components above all herbicides, insecticides or germicides effective in use in a paddy field, (B) a base powder material having a specific gravity of <=1, preferably of 0.5-1, preferably glassy hollow particles having a particle diameter of 100-600mum and (C) a surfactant having a strong activity lowering a surface tension, preferably anion-based and nonion-based surfactants capable of lowering the water surface tension to <=25-35dyne/cm at 25 deg.C and further, if needed, (D) a binder. A mixing ratio of each component is preferably A=0.5-30%, B=40-90%, C=2-10% and D=2-5%. This formulation is especially effective for agrochemical components which are scarcely soluble in water and strongly adsorbed to soil, thus, not able to fully express their agrochemical effectiveness caused by difficulty to disperse in water in usual granules which disintegrate on the surface of a soil after sinking to the bottom of the water.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water surface disintegration and dispersion type pesticide grain or tablet and a method for producing the same.

[0002]

2. Description of the Related Art In recent years, labor saving in pesticide spraying has been demanded, and there has been a demand for the development of a pesticide formulation capable of controlling the entire paddy field by throwing it from the shore without entering the paddy field. BACKGROUND ART Heretofore, granules, tablets, etc. have been tested in which a foaming agent is contained in a preparation to improve the diffusion of a pesticide component in water by utilizing foaming when dropped in water. Also disclosed is a method of dissolving or dispersing an agrochemical active ingredient in an organic solvent having a specific gravity of 1 or less, and further imparting water-spreadability with a surfactant to retain it on a solid material such as granules ( (See JP-A-63-17802, JP-A-5-78204, JP-A-5-155703, and JP-A-5-163102). However, when a foaming agent is used, diffusion of the active ingredient is insufficient, or when a poorly water-soluble organic solvent is used, its developing performance is insufficient,
Even if it is developed, it has a drawback that the pesticide component is insufficiently dispersed from the water surface to the water. Therefore, there is a demand for the development of a new technique for a throw-in formulation for evenly and uniformly distributing pesticide components over the entire paddy field.

[0003]

DISCLOSURE OF THE INVENTION The present invention is to disperse and disperse while spreading over the entire water surface by throwing it locally in the paddy field, and as a result, pesticide grains or tablets that can evenly spread the pesticide ingredient over the entire surface of the paddy field. And a method for producing the same.

[0004]

Means for Solving the Problems As a result of diligent research in view of the above situation, the present inventors have found that the pesticide active ingredient and the specific gravity are 1
By uniformly dispersing the following powder bases and surfactants with high ability to reduce interfacial tension in formulation, the pesticide granules themselves can have the function of disintegrating and dispersing while moving on the water surface. Succeeded in evenly distributing the pesticide components throughout. The present inventors have completed the present invention as a result of further research based on the above findings.

The present invention provides (1) an agrochemical active ingredient, a powder base having a specific gravity of 1 or less, and an agrochemical granule or tablet in which a surfactant having a large interfacial tension reducing ability is uniformly dispersed, and (2) an agrochemical active ingredient. A method for producing pesticide granules or tablets, which comprises uniformly dispersing a powder base having a specific gravity of 1 or less and a surfactant having a large interfacial tension lowering ability for formulation.

As the active ingredient of the solid agricultural chemical composition used in the present invention, any of those generally used as agricultural chemicals can be used. For example, herbicides, insecticides, fungicides and the like are used. To be Above all, herbicides, insecticides and fungicides effective in water surface application are preferably used. The above-mentioned active ingredients can be used alone or in admixture of two or more. Also, acaricides (eg, chlorbenzilate, etc.), plant growth regulators (eg, paclobutrazol, etc.), nematicides (eg, benomyl, etc.), synergists (eg, piperonyl butoxide) Etc.), an attractant (eg, eugenol, etc.), a repellent (eg, creosote, etc.), a pigment (eg, Food Blue No. 1, etc.), a fertilizer (eg, urea etc.), etc. may be mixed. Here, water surface application means
It means to put it on the surface of water such as paddy field, and the place where the main drug shows its activity is not limited to the surface of water.

As an effective herbicide for surface application,
For example, the following (i) to (xiv) are used. (i) Phenoxy herbicides ... For example, 2,4-D, M
CPA, MCPCA, MCPB, Chromprop (chlom
eprop), naproanilide, etc. (ii) Diphenyl ether herbicides ... for example, chlornitrofen, chlormethoxynil
(chlormethoxynil), bifenox, etc. (iii) Carbamate-based herbicides ... for example, suep
(swep), thiobencarb (thiobencarb), esprocarb (esprocarb), molinate (molinate), dimepiperate (dimepiperate), pyributycarb (pyributycarb), etc. (iv) Acid amide herbicides ... For example, propanil (pro
panil), butachlor, pretilachlor
(pretilachlor), bromobutide, mefenacet, HW-52 (2 ', 3'-dichloro-4-)
(Ethoxymethoxybenzanilide), etc. (v) Urea-based herbicides ... For example, dymron
Etc. (vi) Sulfonylurea herbicides ... For example, bensulfuron-methyl, imazosulfuron (N- (2-chloroimidazo [1,2-a] pyridin-3-ylsulfonyl) -N ' -(4,6-dimethoxy-2-pyrimidinyl) urea),
Pyrazosulfuron-ethyl, Cinosulfuron, DPX-47 (Dupont, general name is
Applying for registration as "Azimsulfuron"), DPX-8
4 (Bensulfuron), etc. (vii) Triazine herbicides ... For example, cimetrine
(simetryn), promethrin (prometryn), dimethametrin (dimethametryn), etc. (viii) diazine herbicide ... For example, bentazone
(Bentazone) etc. (ix) Diazole type herbicide ... For example, oxadiazon, pyrazolate, pyrazoxifene, benzophenap.
ap) etc. (x) Dinitroaniline herbicides ... For example, trifluralin (xi) Fatty acid herbicides ... For example, dalapo
n) etc. (xii) Organophosphorus herbicides ... For example, piperofos (pi
(xiii) nitrile herbicides such as chlorthiamid (xiv) Other herbicides such as dithiopyr
iopyr) etc.

Further, as the insecticides and bactericides which are effective in water surface application, for example, (i) to (xiii) are used. (i) Organophosphorus insecticides ... For example, fenthion (fe
nthion), fenitrothion, pirimiphos-methyl, diazinone
n), quinalphos, isoxathion
ion), pyridaphenthion, chlorpyrifos-methyl, vamidothione
(vamidothion), marathon, fentoate
(phenthoate), dimethoate, disulfoton, monocrotophos, tetrachlorvinphos, chlorfenvinphos, propaphos
s), acephate, salithion
n), trichlorphon, EPN, etc. (ii) Carbamate insecticides ... For example, carbaryl
(carbaryl), metolcarb, isoprocarb (MIPC), BPMC, propoxur
(propoxur), xylylcarb (xylylcarb), XMC, carbosulfan, benfurcarb
acarb), methomyl, thiodicar
b) etc. (iii) Synthetic pyrethroid insecticides ... For example, cycloprothrin, etofenprox
(ethofenprox), etc. (iv) Other insecticides ... For example, cartap
p), thiocyclam, bensultap (bensu)
ltap), buprofezin, carbofuran (ca
rbofuran), furathiocarb, cyanofenphos, etc. (v) Polyhaloalkylthio fungicides ... For example, captan (captan), etc. (vi) Organochlorine fungicides ... for example, TPN, fusaride (fthalide), monguard, etc. (vii) Organophosphorus fungicides, eg, edifenphos, IBP (iprobenfos), etc. (viii) Benzimidazole fungicides, eg, thiophanate-methyl (thiophanate) -methyl), benomyl
(benomyl), etc. (ix) Carboxamide-based fungicide ... For example, mepronil (mepronil), flutolanil (flutolanil), tecloftalam (tecloftalam), penciclone (pencycuron), etc. (x) Acylalanine-based fungicide ... (Xi) N-heterocyclic ergosterol inhibitors (eg, metalaxyl), such as triflumizole (xii) Antibiotic fungicides, such as kasugamycin, validamycin A (xii) validamycin A), etc. (xiii) Other fungicides, eg probenazole
(probenazole), isoprothiolane,
Tricyclazole, pyroquiron
lon), oxolinic acid, ferimzon, iprodione, etc.

Especially when the agrochemical composition of the present invention uses, for example, the above-mentioned herbicide, specifically, a sulfonylurea herbicide such as bensulzosulfuron-methyl or imazosulfuron as a main ingredient, for example, paddy field weeds (for example, Tainubie, Tamagawai, Inuhotarui, Konagi, Urikawa, Pine bye, Mizugaya, Kurogwai,
It is especially effective in controlling scabbard, stupid mosquitoes, taiwan yamai, azena, yellow cypress, hirshiroshiro, cloves, mizochabe, etc.). When the above insecticide, specifically, an insecticide such as cartap is used as a main drug, it exerts a particular effect when insecticidal, for example, Nikameichu. Further, when the above-mentioned bactericide, specifically, an organic phosphorus bactericide such as IBP (iprobenfos) is used as a main drug, it exerts a remarkable effect on, for example, blast disease.

As the pesticidal active ingredient, in particular, granules which are usually insoluble in water and strongly adsorbed to soil and which are normally immersed in the bottom of the water and disintegrate on the surface of the soil are difficult to disperse in water. Insecticide that cannot be exerted its medicinal effect and must be added to the formulation more than necessary in order to exert its effect.
Fungicides and herbicides are preferred.

The powder base used in the present invention has a specific gravity of 1 or less. Preferably, those having a specific gravity of 1 to 0.3, and more preferably 1 to 0.5 are used. The powder base has a particle size of 600
It is preferably μ or less, preferably 600 to 10 μ, and more preferably 600 to 100 μ. In the case of an inorganic substance, natural glassy material is fired to have one or more independent bubbles therein. Perlite made of pearlite or obsidian, Shirasu balloon made of shirasu (trade name), vermiculite made of vermiculite, or the like, which is a micro hollow philite obtained by the same firing process using an aluminosilicate (trade name) ) And the like. Examples of organic substances include higher fatty acids such as stearic acid and palmitic acid, which are generally called waxy substances, which are solid at room temperature, higher alcohols such as stearyl alcohol, and paraffin wax, but these waxy substances are water repellent. Therefore, it is difficult for water to permeate, and the pesticide component may be trapped in the waxy substance forever and may be difficult to disperse in water. Therefore, it is preferable to use the mixture with the glassy hollow body.

As the surfactant having a large ability to reduce the interfacial tension used in the present invention, one having a lower interfacial tension which lowers the surface tension of water to 35 dyne / cm or less at 25 ° C. is used. And preferably 35 to 15
Those which reduce to dyne / cm, more preferably 35 to 2
The one that reduces to 5 dyne / cm is used. Examples of the surfactant include anionic surfactants and nonionic surfactants, and specific examples thereof include alkylbenzene sulfonate, polyoxyethylene alkyl ether, polyoxyethylene alkylphenyl ether, and polyoxyethylene alkylphenyl ether. Oxyethylene alkyl phenyl ether sulfate, alkyl sulfosuccinate salt, Surfynol 104, 104A, 10
4E, 104H, TG, TG-E, PC, 61, 82,
Examples include acetylene glycol-based surfactants known by trade names such as 40 and 465 (all manufactured by Air Products Co., Ltd.), but are not limited thereto.
You may use individually or in mixture of 2 or more types in arbitrary ratios as needed. Of these, dioctyl sulfosuccinate is particularly preferable. In addition to the surfactant, sodium lignin sulfonate, sodium naphthalene sulfonate formalin condensate, sodium alkyl naphthalene sulfonate, sodium polyacrylate and the like may be added to the formulation as a dispersant. The amount is 0.1-2
It is 0% by weight, preferably 0.5 to 10% by weight, more preferably 1 to 5% by weight.

Upon molding, a binder may be added if necessary, and the binder is preferably water-soluble so that the particles or tablets can be easily disintegrated on the water surface. Examples thereof include dextrin, sodium salt of carboxymethyl cellulose, polyvinylpyrrolidone, sodium polyacrylate, polyvinyl alcohol, sodium lignin sulfonate, and the like. In addition, since the amount added to the formulation is determined by the relationship between the moldability and its disintegration property, the dissolution rate in water is high, and the disintegration property of the formulation is easily adjusted. Dextrin having an average molecular weight of 10,000 to 20,000 (eg, commercial products More preferable is dextrin ND-S Nitto Kagaku Co., Ltd. or sodium lignin sulfonate that can be used as a dispersant. The above-mentioned binders may be used alone, or two or more kinds may be used in combination if necessary in order to obtain the optimum range of disintegrating property for uniform diffusion of the drug into the paddy field. .

Further, if desired, an appropriate amount of an extender may be added within a range that the apparent specific gravity of the granule is 1 or less.
The extender is preferably one that does not promote or hinder the dispersion of the active ingredient in water, and therefore it is necessary to be water-soluble or water-dispersible. For example, water-soluble fertilizers such as urea, ammonium sulfate, ammonium chloride and potassium chloride, soluble sugars such as lactose and glucose, inorganic salts such as calcium carbonate and sodium bicarbonate, mineral substances such as bentonite, sieglite, acid clay and diatomaceous earth. Fine powders may be mentioned, but not limited to these.

Further, the preparation of the present invention has a unit of 20 to 200 g, and more preferably 3 so that it can be easily sprayed.
You may package in a water-soluble film by the unit of 0-100g. Examples of the water-soluble film include polyvinyl alcohol (PVA), carboxymethyl cellulose, starch, gelatin, polyvinylpyrrolidone, polyacrylic acid and its salts, pullulan (trade name; starch-based polysaccharide,
Hayashibara Shoji Co., Ltd.), Paogen (trade name; thermoplastic water-soluble polymer, Daiichi Kogyo Seiyaku Co., Ltd.), or a mixture of two or more species, and a mixture of wood pulp may be used, but the dissolution or dispersion in water is fast. It is better to choose a film.

In the preparation of the present invention, first, a pesticidal active ingredient, a powder base having a specific gravity of 1 or less, a surfactant having a large interfacial tension lowering ability, a binder if necessary, and optionally a bulking agent are mixed, and these are mixed. Produce a uniformly dispersed product.
The term “uniformly dispersed” means that the above-mentioned constituents are equally present in the inside and the vicinity of the surface of each particle or tablet in the same proportion. In order to produce uniformly dispersed granules, for example, the above-mentioned constituents are put into a commonly used mixer, for example, a ribbon blender or a V-type mixer in the same manner as in a usual wet method, and well mixed. After that, the mixture is transferred to a kneader, water is added and kneaded, and then granulated by an extrusion granulator to obtain a granule having a particle diameter of 0.5 to 5 mm.

The amount ratio of the pesticidal active ingredient, the powder base, the surfactant and the binder used for uniform dispersion must be adjusted so that the apparent specific gravity is 1 or less as a whole preparation, but the ingredients are 0 0.01-70%, preferably 0.1-50%, more preferably 0.5-30
%, The components are generally 20-98%, preferably 40
˜90%, more preferably 50 to 90%, the components are generally 0.1 to 30%, preferably 0.5 to 20%, more preferably 2 to 10%, generally 0.5. ~ 2
0%, preferably 1-10%, more preferably 2-5
%.

In order to produce uniformly dispersed tablets, the above granules may be used as they are, or an excipient or the like may be added and the mixture may be molded with a tablet molding machine or the like. The excipient may be any as long as it does not prevent the disintegration of particles or tablets on the water surface, and examples thereof include cellulose and its derivatives, starch and its derivatives, polyethylene glycol, lactose, calcium phosphate, and the like. Examples thereof include crystalline cellulose, which is also used as an agent, low-substituted hydroxypropyl cellulose, hydroxypropyl starch and the like.

The pesticidal preparation of the present invention produced in this manner has substantially no phytotoxicity to plants, and it is also harmless to animals or seafood during or after application, and can be used safely. . As the method of using the pesticide granules or tablets of the present invention, the pesticide granules or tablets may be directly grasped by hand and thrown into the paddy field from the ridge, or may be thrown in a water-soluble bag in units of about 20 to 200 g. good. At that time, 1
The active ingredient content is adjusted so that the number of thrown pieces per 0a is 5 to 30 bags. Moreover, when water is introduced into the paddy field, a necessary amount of granules may be thrown into the water mouth as it is according to the size of the paddy field (water mouth treatment). The formulation of the present invention can spread the active ingredient over the entire paddy field in a short time, and the formulation can control the entire paddy field only by throwing the active ingredient locally.

When the granules according to the present invention are dropped on the surface of water, they do not sink because they have an apparent specific gravity of 1 or less, but since they contain a surfactant having a large ability to reduce interfacial tension, the granules can be quickly watered. At the same time as entering, the activator begins to melt, the surface tension of the water around the particles decreases, the particles are pulled on the water surface to the outside of the dropping point, the distance between the particles widens, and at the same time it begins to collapse, but Due to the uniform production of the surfactant inside the formulation, it continues to spread and disintegrate on the water surface until it becomes primary particles, and pesticide active ingredients with specific gravity of 1 or more are dispersed in water. At the end, only the powder base having a specific gravity of 1 or less remains on the water surface. At this time, it is necessary to adjust the hardness of the granule so that it has a disintegrating property such that it disintegrates due to the difference in surface tension. Thus, the pesticide active ingredient will be evenly distributed throughout the paddy field. Since such spreading, disintegration, and dispersion of the granules on the water surface occur very instantly, there is no fear of the active ingredient being biased in the paddy field due to the influence of the wind at the time of spraying, or the chemical damage.

The characteristics of the preparation of the present invention are as follows. (a) Compared with conventional granules, etc., it is possible to control a wide range of paddy fields by simply throwing it into several places from the ridge without entering the paddy fields and requiring a special sprayer. Saves money. (b) Compared to other water-borne formulations, in the manufacturing process, the main drug is suspended or dissolved in a poorly water-soluble or insoluble organic solvent, and the suspended or dissolved product is coated or impregnated into the grain core. It does not require a special process such as a step, and can be manufactured simply and inexpensively. (c) The formulation of the present invention, after being applied to the water surface, rapidly disintegrates and spreads.Therefore, there is a risk of biased effects caused by being blown away by the wind, and there is also concern about drug damage at the dropping point, which was a problem with effervescent formulations. Absent.

Further, in the above-mentioned JP-A-5-163102, granules having a general particle size are prepared by a conventional granule formulation method using an agrochemical component whose water surface spreadability and water dispersibility are adjusted and imparted. A method of filling a bag of a water-soluble film such as polyvinyl alcohol is described, but in order to impart water surface spreadability and dispersibility in water, an organic solvent is used, or an agrochemical component is finely pulverized or / and water repellent. It is claimed that the dispersibility in water is adjusted with a surfactant by mixing with an agent, and (1) using a powder base having a specific gravity of 1 or less, such as the formulation of the present invention, (2) further It has not been shown that the pesticide component and the surfactant are uniformly present in the formulation formed into granules or tablets using (3) and that the formulation is easily disintegrated when dropped on the water surface.

Further, in the present invention, only the surfactant having a high interfacial tension lowering ability imparts the water surface spreadability and the water dispersibility of the pesticide component, and the pesticide component is separated from the dropping point of the paddy field. The particles that are transported to the place are because the particles containing the pesticide component expand and disintegrate due to the surface tension of water, and because they dissolve or disperse in the organic solvent and adhere to the water repellent. This is essentially different from the technique disclosed in JP-A-5-163102. On the other hand, in the present invention, the disintegration speed is adjusted so that the disintegration of the particles is not too fast and the drug is not biased to the dropping point, and it does not disintegrate and floats on the water surface and is blown by the wind so that the effect is not biased. There is a need. Specifically, the time until the particles disintegrate into single particles after being dropped on the water surface is adjusted to 1 minute or more and 1 hour or less.

[0024]

EXAMPLES The present invention will be described in more detail below with reference to examples and test examples, but the present invention is not limited thereto.

Example 1 Components of the following [Table 1]:

[Table 1] (“Add. 100” indicates that the ingredients are added to make 100%. The same applies to the following.) 60 parts of water is added to 100 parts of the formulation, and the mixture is kneaded and granulated by an extrusion granulator , Dried,
It was sieved to obtain a granule having a particle size of 2 mm and a particle length of 4 to 8 mm. This granule (50 g) was wrapped in a PVA film.

Example 2 The following components of [Table 2]:

[Table 2] After adding 65 parts of water to 100 parts of the formulation and kneading, granulating with an extrusion granulator, drying and sieving to obtain a particle size of 5 mm and a particle length of 10 to 10.
15 mm granules were obtained. This granule was packaged in a PVA film.

Example 3 Components of the following [Table 3]:

[Table 3] After adding 70 parts of water to 100 parts of the formulation and kneading, granulate with an extrusion granulator, dry and sieve to have a particle size of 2 mm and a particle length of 4 to 8
mm granules were obtained. This granule (50 g) was wrapped in a PVA film.

Example 4 Components of the following [Table 4]:

[Table 4] After adding 70 parts of water to 100 parts of the formulation and kneading, granulating with an extrusion granulator, drying and sieving to obtain a particle size of 5 mm and a particle length of 10 to 10.
15 mm granules were obtained. This granule was packaged in a PVA film.

Example 5 The following ingredients in Table 5:

[Table 5] After adding 70 parts of water to 100 parts of the formulation and kneading, granulate with an extrusion granulator, dry and sieve to have a particle size of 1 mm and a particle length of 2 to 4
mm granules were obtained. This granule was packaged in a PVA film.

Example 6 Components of the following [Table 6]:

[Table 6] After adding 60 parts of water to 100 parts of the preparation and kneading, granulate with an extrusion granulator, dry and sieve to have a particle size of 2 mm and a particle length of 4 to 8
mm granules were obtained. A predetermined amount of this granule was wrapped in a PVA film.

Example 7 The following ingredients in Table 7:

[Table 7] After adding 55 parts of water to 100 parts of the formulation and kneading, granulate with an extrusion granulator, dry and sieve to have a particle size of 1 mm and a particle length of 1 to 4
mm granules were obtained. A predetermined amount of this granule was wrapped in a PVA film.

Example 8 The following ingredients in Table 8:

[Table 8] Granules were produced in the same manner as in Example 3. This granule (50 g) was wrapped in a PVA film.

Example 9 The following ingredients in Table 9:

[Table 9] Granules were produced in the same manner as in Example 3. This granule (25 g) was wrapped in a PVA film.

Reference Example 1 Components of the following [Table 10]:

[Table 10] After adding 70 parts of water to 100 parts of the formulation and kneading, granulate with an extrusion granulator, dry and sieve to have a particle size of 2 mm and a particle length of 4 to 8
mm granules were obtained. A predetermined amount of this granule was wrapped in a PVA film.

Test Example 1 The preparations obtained in Examples 3 to 5 and Reference Example 1 were subjected to a diffusivity test. That is, as shown in FIG. 1, 50 liters of water was placed in a polypropylene vat having a length of 114 cm and a width of 74 cm (water depth of about 6 cm). Next, 1 g each of the preparations obtained in Examples 3 to 5 and Reference Example 1 was dropped at the dropping points shown in FIG. 1, and the points A, B, C, D, and E shown in FIG. A certain amount of water was collected over time, the concentration of the pesticide active ingredient in the collected water was measured, and the diffusivity was compared. The results are shown in [Table 11] to [Table 14].
Shown in. The values in the table are the values (unit:%) obtained by dividing the concentration in the water sample by the concentration dropped. [Table 11] shows the result of the preparation of Example 3, [Table 12] shows the result of the preparation of Example 4, [Table 13] shows the result of the preparation of Example 5, and [Table 14] shows the reference example 1. The results of each of the formulations are shown below. In addition, [Table 11]-
In Table 14, imazo, dime and mefena represent imazosulfuron, dimeron and mefenacet, respectively.

[Table 11]

[Table 12]

[Table 13]

[Table 14] As is clear from [Table 14], in the preparation of Reference Example 1, the concentration of the main drug in water at the locations (B, C, E) away from the dropping point was lower than that in Examples 4 to 6, and diffusion was insufficient. And
In a biological test in an actual field, it has the drawbacks that the herbicidal effect may be reduced and that the chemical damage at the dropping point may occur.
However, as is clear from [Table 11] to [Table 13], the formulation of the present invention can spread the active ingredient over the entire paddy field in a short time. It is considered that this does not cause phytotoxicity and fully exerts the effect. Therefore, this formulation has an excellent property that it can control the entire paddy field by throwing it into the paddy field locally.

Test Example 2 (diffusion test method) Further, in order to more accurately grasp the degree of diffusion from the dropping point, the diffusivity was evaluated by the following test method. The formulation wrapped in the PVA film obtained in Examples 3, 8 and 9 is dropped in the center of a polypropylene vat containing 50 liters of water as in Test Example 1. In order to fix the drug product at the dropping point in advance, [Fig. 2]
Put a 200ml poly cup with the upper part cut out as in the above. Two hours after the dropping, a fixed amount of water was sampled from the dropping point and the positions of A, B, C and D shown in [Fig. 3],
High-performance liquid chromatography (HP
Quantify by LC). Then, the diffusivity is evaluated by the average concentration of each main drug at points A to D and the concentration at the dropping point. The obtained results are shown in [Table 15]. The concentrations in the table are numerical values (unit:%) obtained by dividing the concentration in the water sample by the concentration dropped.

[Table 15] As is clear from [Table 15], the granules of Example 3, 8 or 9 were sufficiently diffused from the dropping point, and the residue at the dropping point was small. Therefore, this formulation can control the entire paddy field simply by throwing it into the paddy field locally.

[0037]

EFFECT OF THE INVENTION Since the formulation of the present invention can spread the active ingredient over the entire paddy field in a short time, the formulation can control the entire paddy field only by throwing it into the paddy field locally.

[Brief description of drawings]

FIG. 1 is a schematic view of a dropping point of a dispersibility test in Test Example 1.

FIG. 2 shows a diagram of the cup used in Test Example 2. Cut out so that the position of Z in the figure is lower than the water depth.

FIG. 3 is a schematic diagram of a dropping point and a water sampling point of a diffusion test in Test Example 2.

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[Procedure amendment]

[Submission date] March 23, 1995

[Procedure Amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0007

[Correction method] Change

[Correction content]

As an effective herbicide for surface application,
For example, the following (i) to (xiv) are used. (i) Phenoxy herbicides ... For example, 2,4-D, M
CPA, MCPCA, MCPB, Chromprop (chlom
eprop), naproanilide, etc. (ii) Diphenyl ether herbicides ... for example, chlornitrofen, chlormethoxynil
(chlormethoxynil), bifenox, etc. (iii) Carbamate-based herbicides ... for example, suep
(swep), thiobencarb (thiobencarb), esprocarb (esprocarb), molinate (molinate), dimepiperate (dimepiperate), pyributycarb (pyributycarb), etc. (iv) Acid amide herbicides ... For example, propanil (pro
panil), butachlor, pretilachlor
(pretilachlor), bromobutide, mefenacet, HW-52 (2 ', 3'-dichloro-4-)
(Ethoxymethoxybenzanilide), etc. (v) Urea-based herbicides ... For example, dymron
Etc. (vi) Sulfonylurea herbicides: For example, bensulfuron-methyl, imazosulfuron (N- (2-chloroimidazo [1,2-a] pyridin-3-ylsulfonyl) -N ' -(4,6-dimethoxy-2-pyrimidinyl) urea),
Pyrazosulfuron-ethyl, Cinosulfuron, DPX-47 (Dupont, general name is
(Application for registration as "azim-sulfuron" ) etc. (vii) Triazine herbicides ... For example, cimetrin
(simetryn), promethrin (prometryn), dimethametrin (dimethametryn), etc. (viii) diazine herbicide ... For example, bentazone
(bentazone) etc. (ix) Diazole herbicide ... For example, oxadiazon, pyrazolate, pyrazoxifene, benzophenap.
ap) etc. (x) Dinitroaniline herbicides ... For example, trifluralin (xi) Fatty acid herbicides ... For example, dalapo
n) etc. (xii) Organophosphorus herbicides ... For example, piperofos (pi
(xiii) nitrile herbicides such as chlorthiamid (xiv) Other herbicides such as dithiopyr
iopyr) etc.

[Procedure Amendment 2]

[Document name to be amended] Statement

[Name of item to be corrected] 0029

[Correction method] Change

[Correction content]

Example 5 The following ingredients in Table 5:

[Table 5] After adding 70 parts of water to 100 parts of the formulation and kneading, granulate with an extrusion granulator, dry and sieve to have a particle size of 1 mm and a particle length of 2 to 4
mm granules were obtained. This granule was packaged in a PVA film.

[Procedure 3]

[Document name to be amended] Statement

[Correction target item name] 0035

[Correction method] Change

[Correction content]

Test Example 1 The preparations obtained in Examples 3 to 5 and Reference Example 1 were subjected to a diffusivity test. That is, as shown in FIG. 1, 50 liters of water was placed in a polypropylene vat having a length of 114 cm and a width of 74 cm (water depth of about 6 cm). Next, 1 g each of the preparations obtained in Examples 3 to 5 and Reference Example 1 was dropped at the dropping points shown in FIG. 1, and the points A, B, C, D, and E shown in FIG. A certain amount of water was collected over time, the concentration of the pesticide active ingredient in the collected water was measured, and the diffusivity was compared. The results are shown in [Table 11] to [Table 14].
Shown in. The values in the table are the values (unit:%) obtained by dividing the concentration in the water sample by the concentration dropped. [Table 11] shows the result of the preparation of Example 3, [Table 12] shows the result of the preparation of Example 4, [Table 13] shows the result of the preparation of Example 5, and [Table 14] shows the reference example 1. The results of each of the formulations are shown below. In addition, [Table 11]-
In Table 14, imazo, dime and mefena represent imazosulfuron, dimeron and mefenacet, respectively.

[Table 11]

[Table 12]

[Table 13]

[Table 14] As is clear from [Table 14], in the formulation of Reference Example 1, the concentration of the main drug in water at the locations (B, C, E) away from the dropping point was lower than that in Examples 3 to 5 , and diffusion was insufficient. And
In a biological test in an actual field, it has the drawbacks that the herbicidal effect may be reduced and that the chemical damage at the dropping point may occur.
However, as is clear from [Table 11] to [Table 13], the formulation of the present invention can spread the active ingredient over the entire paddy field in a short time. It is considered that this does not cause phytotoxicity and fully exerts the effect. Therefore, this formulation has an excellent property that it can control the entire paddy field by throwing it into the paddy field locally.

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Claims (6)

[Claims] 1. A pesticide grain or tablet in which a pesticide active ingredient, a powder base having a specific gravity of 1 or less, and a surfactant having a large interfacial tension reducing ability are uniformly dispersed. 2. A surfactant having a large ability to reduce interfacial tension reduces the interfacial tension by reducing the surface tension of water at 25 ° C. to 35 dyne / cm.
The pesticide granule or tablet according to claim 1, which is a surfactant that reduces the amount to the following. 3. The binder according to claim 1, wherein the binder is uniformly dispersed.
Pesticide grain or tablet as described. 4. The pesticide grain or tablet according to claim 1, which is packaged in a water-soluble film in an amount of 20 to 200 g. 5. A method for producing pesticide granules or tablets, which comprises uniformly dispersing a pesticidal active ingredient, a powder base having a specific gravity of 1 or less, and a surfactant having a large interfacial tension reducing ability for formulation. 6. The method for producing pesticide granules or tablets according to claim 5, wherein the binder is further uniformly dispersed to prepare a formulation.