JPH0952810A - Herbicide composition - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a herbicide composition of an aqueous emulsion extremely excellent in storage stability by preparing an emulsion of pyributicarb using a specific emulsifier, a specific emulsion stabilizer, a specific organic solvent and water. SOLUTION: This composition is obtained by compounding (a) O-3-tert- butylphenyl-6-methoxy-2-pyridyl (methyl) thiocarbamate (pyributicarb) as an active component with (b) an emulsifier such as polyoxyethylene tristyrylphenyl ether, (c) an emulsion stabilizer such as a polyoxyethylene alkylamino ether of a surfactant, (d) an aromatic compound (an organic solvent) and (e) water. The compounding ratios of (a):(b):(c):(d):(e) are 1-20:1-15:0.5-10:3-60:10-90 in terms of wt.%, respectively. The organic solvent (d) is preferably an aromatic compound having a boiling point in the range of 160-330 deg.C. The composition is physically stable even in a long storage or under a condition where the temperature changes severely, and it does not have troubles on practical use under these conditions.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to O-3-tert.
-Butylphenyl-6-methoxy-2-pyridyl (methyl) thiocarbamate (hereinafter referred to as pyributycarb)
The present invention relates to a herbicidal composition in the form of a stabilized aqueous emulsion, which comprises as a herbicidal active ingredient.

[0002]

BACKGROUND OF THE INVENTION Pyributycarb, an active ingredient of the herbicide of the present invention, is a selective herbicide for controlling weeds such as millet in an agricultural land where general broad-leaved crops such as soybeans and especially rice crops such as rice grow. It is disclosed in Japanese Examined Patent Publication No. 62-54424 as useful as. The present active ingredient is generally used by formulating it into an emulsion, a wettable powder, a granule and the like. For example, Japanese Patent Application Laid-Open No. 4-5204 discloses a wettable powder, and a water-suspended composition (flowable formulation) has a special feature. It is disclosed in Japanese Patent Laid-Open No. 5-139904.
Further, although various emulsions have been conventionally known as aqueous emulsion formulations, no aqueous emulsion formulations using pilibricarb are known at all.

[0003]

Aqueous emulsion formulations are a new alternative to emulsions and have the disadvantages of other formulations.
For example, it can solve the problem of dusting when using a wettable powder, the problem of flammability at the time of production, transportation, and storage of emulsion, but it is thermodynamically unstable, and a long time elapses after preparation. As a result, various problems occur with respect to the physical stability of the drug product, such as the emulsion particles once dispersed and the separation of the aqueous phase, and further improvement is required for the stability especially under severe temperature changes. It was

[0004]

Means for Solving the Problems As a result of intensive studies to solve the above problems, the present inventors have found that an aqueous emulsion prepared by adjusting pyributycarb with a specific emulsifier, a specific emulsion stabilizer, a specific organic solvent and water. A herbicide composition in the form of
The inventors have found that they have excellent physical stability even under conditions of long-term storage and severe temperature changes, and have no practical problems, and have completed the present invention. That is, the present invention provides (a) an active ingredient of a herbicide, O-3-tert-butylphenyl-6-methoxy-2-pyridyl (methyl) thiocarbamate,
(B) one or more emulsifiers selected from the group consisting of polyoxyethylene tristyryl phenyl ether, polyoxyethylene / polyoxypropylene block polymer or a derivative thereof as the emulsifier, and (c) an emulsifying stabilizer containing polyoxyethylene One selected from the group consisting of ethylene alkyl amino ether, silicone glycol, polyalkylene glycol ether of polyethylene polyamine, polyoxyethylene arylphenyl ether phosphate ester salt, polyoxyethylene arylphenyl ether sulfate ester salt, and higher alcohol. The present invention relates to a herbicidal composition in the form of an aqueous emulsion, which comprises the above surfactant, (d) an organic solvent as an organic solvent, and (e) water.

The herbicidal active ingredient used in the present invention is O-3-tert-butylphenyl-6-methoxy-2-pyridyl (methyl) thiocarbamate, which is generally called pyributycarb. Pyributicarb is already sold as a herbicide and is practically water insoluble.

The emulsifier (b) used in the present invention is polyoxyethylene tristyryl phenyl ether, polyoxyethylene / polyoxypropylene block polymer or a derivative thereof, and these may be used alone or in combination. . The polyoxyethylene tristyryl phenyl ether is preferably polyoxyethylene (5
Up to 40 mol) of tristyryl phenyl ether and the like, for example, polyoxyethylene (16 mol) tristyryl phenyl ether, SOPROPHOR BSU
(Registered trademark: manufactured by Rhone Poulin Co., Ltd.) and the like are preferable.

The polyoxyethylene / polyoxypropylene block polymer preferably has a molecular weight of 50.
0 to 20,000, more preferably 1,000 to 10,000
And the like. The ratio of polyoxyethylene in the block polymer is preferably 5 to 70%, more preferably 20 to 65%. More specifically, for example, polyoxyethylene / polyoxypropylene block polymer having a molecular weight of about 5,000 and a polyoxyethylene ratio of about 50%, Newcargen 5050PB (registered trademark: manufactured by Takemoto Yushi Co., Ltd.), SORPOL 7695E.
(Registered trademark: manufactured by Toho Chemical Industry Co., Ltd.) and the like are preferable.

The polyoxyethylene / polyoxypropylene block polymer derivative is preferably one obtained by esterifying the terminal hydroxyl group of the above block polymer with an unsaturated or saturated fatty acid, or etherified with a higher alcohol or tristyrylphenol. The ones that have been done are listed. Examples of the unsaturated or saturated fatty acid used herein include fatty acids having 5 to 20 carbon atoms, more preferably 10 to 18 carbon atoms, and examples of higher alcohols having 5 to 20 carbon atoms.
More preferably, 10-18 aliphatic alcohol is mentioned. More specifically, the block polymer derivative is, for example, polyoxyethylene / polyoxypropylene block polymer monooleate having a molecular weight of about 3000 and a polyoxyethylene ratio of about 35%; Polyoxyethylene / polyoxypropylene block polymer monolauryl ether, polyoxyethylene / polyoxypropylene tristyrylphenyl ether, SPO with a ratio of about 40%
Suitable examples include ROPHOR 796 / P (registered trademark: manufactured by Rhone Poulenc Co., Ltd.) and Brian P-3035-OL (registered trademark: manufactured by Matsumoto Yushi Co., Ltd.).

As the emulsion stabilizer (c) used in the present invention, polyoxyethylene alkylamino ether, silicon glycol, polyalkylene glycol ether of polyethylene polyamine, polyoxyethylene arylphenyl ether phosphate ester salt, poly These are oxyethylene arylphenyl ether sulfate ester salts, decyl alcohol, oleyl alcohol, and higher alcohols, and one or more of these can be used.

As the polyoxyethylene alkylamino ether, those having an alkyl group having 6 to 18 carbon atoms are preferable, and those having a polymerization degree of 5 to 20 are preferable. Preferable examples include polyoxyethylene (12 mol) lauryl amino ether and ADJ-4 (manufactured by Takemoto Yushi Co., Ltd.).

As the silicone glycol, for example,
Preferable examples include Dow Corning X2-5309 (manufactured by Toray Dow Corning Silicone Co., Ltd.). Preferred examples of the polyalkylene glycol ether of polyethylene polyamine include those having an alkylene group having 2 to 18 carbon atoms. Further, those having a molecular weight of 2 to 100,000 are preferable. For example, New Kargen D302
0 (registered trademark: manufactured by Takemoto Yushi Co., Ltd.) and the like are preferable.

As the polyoxyethylene arylphenyl ether phosphate esterified salt, those having an aryl group such as a phenyl group, a naphthyl group and a styryl group are preferable, and those having a polymerization degree of 5 to 20 are preferable. For example, polyoxyethylene (12 mol) styryl phenyl ether phosphate ester salt, SOPROPH
OR FLK (registered trademark: manufactured by Rhone Poulin),
Newcalgen FS-3 (registered trademark: Takemoto Yushi Co., Ltd.)
Manufactured) and the like. Examples of the salt here include sodium, potassium, magnesium, calcium,
Examples thereof include ammonium, ethanolamine, diethanolamine, triethanolamine and the like.

As the polyoxyethylene arylphenyl ether sulfate esterified salt, those having an aryl group such as a phenyl group, a naphthyl group and a styryl group are preferable, and those having a polymerization degree of 7 to 25 are preferable. For example, polyoxyethylene (17 mol) tristyryl phenyl ether sulfate ester salt, SORPOL
7695E (registered trademark: manufactured by Toho Chemical Industry Co., Ltd.) and the like are preferable. Examples of the salt here include sodium, potassium, magnesium, calcium, ammonium, ethanolamine, diethanolamine, triethanolamine and the like.

As the higher alcohol, a linear or branched aliphatic alcohol having 3 to 25 carbon atoms is preferable, and for example, decyl alcohol, oleyl alcohol, isostearyl alcohol and the like are preferable.

The organic solvent (d) used in the present invention is an aromatic compound, and the distillation temperature is preferably 16
Aromatic compounds in the range of 0 to 330 ° C. may be mentioned. Such a compound is preferably, for example, Solvesso 10
0, Solvesso 150 or Solvesso 200 (Solvesso is a registered trademark of Exxon Chemical Co., Ltd.), methylnaphthalene, dimethylmonoisopropylnaphthalene,
Examples thereof include mono-, di-, tri- or tetra-alkylnaphthalene having an alkyl group having 1 to 5 carbon atoms such as dimethyldiisopropylnaphthalene. The alkyl group in the alkylnaphthalene may be linear or branched, and when it has two or more alkyl groups, it may have not only the same kind but different kinds of alkyl groups.

In addition to these, the composition of the present invention requires water (e) as an essential component. In the present invention, a surfactant other than the emulsion stabilizer (c) may be added within a range that does not impair the intended purpose. Examples of the surfactant include polyoxyethylene alkyl phenyl ethers, polyoxyethylene aryl phenyl ethers, polyoxyethylene castor oil ethers, polyoxyethylene sorbitan esters, polyglycerin fatty acid esters, and sorbitan fatty acid esters. A nonionic surfactant is mentioned. In addition, if necessary, a small amount of an anionic surfactant that is usually used in agricultural chemical formulations can be added within a range that does not impair the effects of the present invention.

Further, in the present invention, an organic solvent other than the organic solvent (d) may be added within a range not impairing the intended purpose. Examples of the organic solvent include ketones, fatty acid esters, phthalic acid esters, vegetable oil and the like. The herbicidal composition of the present invention may contain additives such as an antifoaming agent and an antifreezing agent, if necessary, in addition to the above components. As the antifoaming agent, for example, a silicon-based defoaming agent, and as the antifreezing agent, for example, diols such as ethylene glycol and diethylene glycol, glycol ethers,
Urea or the like is preferably used.

The herbicidal composition in the form of an aqueous emulsion of the present invention may be prepared by a known method for preparing an aqueous emulsion. That is, a mixture of the herbicide active ingredient (a), the emulsifier (b), the emulsion stabilizer (c), and the organic solvent (d) is prepared and then added to water (e) and stirred. Further, fine particles may be formed by using a high speed homogenizer or a high pressure emulsifying machine. Generally, the blending ratio of the herbicidal active ingredient (a) in the aqueous emulsion composition of the present invention is set within a range that does not cause a problem in solubility in the organic solvent (d) or use of pesticides. The emulsifier (b) is the herbicide active ingredient (a).
And the total amount of the organic solvent (d) are 1:20 by weight ratio.
The emulsion stabilizer (c) is added at a weight ratio of about 1:10 to 1: 1 with respect to the emulsifier (b), and the organic solvent (d) is added as a herbicide active ingredient ( It is added so that the weight ratio to a) is about 3: 1 to 6: 1.
A composition having the following composition is preferable.

1 to 20% by weight of the active ingredient substance (a), more preferably 5 to 15% by weight, and an emulsifier (b) 0.5 to 15%
% By weight, more preferably 2-8% by weight, emulsion stabilizer (c) 0.1-10% by weight, more preferably 0.5-5.
%, Organic solvent (d) 3 to 60% by weight, more preferably 3 to 40% by weight, water (e) 10 to 90% by weight, more preferably 30 to 80% by weight.

[0020]

BEST MODE FOR CARRYING OUT THE INVENTION The herbicidal composition of the present invention comprises the above-mentioned herbicidal active ingredient (a), emulsifier (b), emulsion stabilizer (c), organic solvent (d) and water (e). Which is a stable aqueous emulsion type. The herbicidal composition is
Preferably, the herbicide active ingredient (a) is 1 to 20% by weight, the emulsifier (b) is 1 to 15% by weight, the emulsion stabilizer (c) is 0.5 to 10% by weight, and the organic solvent (d) is 3%. ~ 60% by weight
Sequentially mix and prepare by adding water to 10 to 90% by weight. The manufactured herbicide composition can be sprayed as it is to a field that has been weeded without dilution, as in the case of a conventional emulsion. The herbicidal composition has effective herbicidal activity,
Has little harm to users, is easy to spray, and has excellent storage stability.

[0021]

EXAMPLES The present invention is described in more detail below by showing Examples and Comparative Examples of the present invention, but these do not limit the scope of the present invention in any way. The physical properties in the examples and comparative examples of the present invention were measured under the following conditions. Storage stability (conditions): storage at room temperature (20 ° C) for 30 days storage at 50 ° C for 30 days storage at -5 ° C for 30 days 40 ° C for 3 days, -5 ° C for 4 days as one cycle Stored for 4 cycles ・ Average particle size: Coulter LS230 ・ Viscosity: B type viscometer (30 rpm / 20 ° C) ・ Crystal precipitation: Optical microscope (× 400)

[Example 1] 12.5 parts by weight of pyributicarb, polyoxyethylene / polyoxypropylene block polymer as an emulsifier: Newcargen 5050PB
(Takemoto Yushi Co., Ltd.) 4 parts by weight and silicone glycol as an emulsion stabilizer: Dow Corning X2-53
09 (manufactured by Toray Dow Corning Silicone Co., Ltd.) and 39.5 parts by weight of Solvesso 200 (registered trademark of Exxon Chemical Co., Ltd.) as an organic solvent were melt mixed at 50 ° C., and then 5 parts by weight of ethylene glycol. Was gradually added to a solution prepared by dissolving 34 parts by weight of water with stirring to obtain 100 parts by weight of an aqueous emulsion, and stirred at 10,000 rpm for 10 minutes. The resulting aqueous emulsion had the following properties. -Average particle size: 1.4 m-Viscosity: 196 mPa-s-Storage stability: A stable aqueous emulsion form was retained under each of the storage conditions. Crystal precipitation: Crystal precipitation of the herbicide active ingredient was not observed under each of the above storage conditions.

[Example 2] 12.5 parts by weight of pyributicarb, polyoxyethylene / polyoxypropylene block polymer as an emulsifier: Newcargen 5050PB
(Same as above) 4 parts by weight are melt-mixed at 50 ° C. and then, as an emulsion stabilizer, a polyalkylene glycol ether derivative of polyethylene polyamine: Newkalgen D3020
(Takemoto Yushi Co., Ltd.) 1 part by weight, Solvesso 200 (same as above) 39.5 parts by weight as an organic solvent, and 5 parts by weight of ethylene glycol were dissolved in 38 parts by weight of water and gradually added to the solution with stirring. Then, 100 parts by weight of the aqueous emulsion was obtained and stirred at 10,000 rpm for 10 minutes. The resulting aqueous emulsion had the following properties.・ Average particle size: 1.5 μm ・ Viscosity: 125 mPa · s ・ Storage stability: A stable aqueous emulsion form was retained under each of the storage conditions. Crystal precipitation: Crystal precipitation of the herbicide active ingredient was not observed under each of the above storage conditions.

[Example 3] 12.5 parts by weight of pyributicarb and Solvesso 200 (same as above) 39.5 as an organic solvent
After 3 parts by weight of polyoxyethylene tristyryl phenyl ether: SOPROPHOR BSU (registered trademark of Rhone Poulenc Co., Ltd.) as an emulsifier was melt mixed at 50 ° C., polyoxyethylene tristyryl phenyl ether phosphorus was used as an emulsion stabilizer. Acid esterified salt: SO
0.5 parts by weight of PROPHOR FLK (registered trademark of Rhone Poulenc Co., Ltd.) and 6 parts by weight of ethylene glycol were gradually added to a solution of 38.5 parts by weight with stirring to obtain 100 parts by weight of an aqueous emulsion. 10,000r
Stirred at pm for 10 minutes. The resulting aqueous emulsion had the following properties. -Average particle size: 1.2 m-Viscosity: 236 mPa-s-Storage stability: A stable aqueous emulsion form was retained under each of the storage conditions. Crystal precipitation: Crystal precipitation of the herbicide active ingredient was not observed under each of the above storage conditions.

Example 4 12.5 parts by weight of pyributicarb, Solvesso 200 (same as above) 39.5 as an organic solvent
By weight, as an emulsifier, polyoxyethylene polyoxypropylene tristyryl phenyl ether: SOPROP
HOR 796 / P (registered trademark of Rhone Poulin)
After melt-mixing 2.5 parts by weight at 50 ° C., polyoxyethylene tristyrylphenyl ether phosphate ester salt: SOPROPHOR FLK as an emulsion stabilizer
(Same as above) 0.5 parts by weight and 6 parts by weight of ethylene glycol were gradually added to a solution prepared by dissolving 39.0 parts by weight of water with stirring to obtain 100 parts by weight of an aqueous emulsion.
Stir at 0 rpm for 10 minutes. The resulting aqueous emulsion had the following properties. -Average particle size: 2.0 μm-Viscosity: 444 mPa-s-Storage stability: A stable aqueous emulsion form was retained under each of the storage conditions. Crystal precipitation: Crystal precipitation of the herbicide active ingredient was not observed under each of the above storage conditions.

[Example 5] 12.5 parts by weight of pyributicarb and 39.5 as an organic solvent Solvesso 200 (same as above)
Parts by weight, polyoxyethylene / polyoxypropylene block polymer as an emulsifier: Newkalgen 5050
After melt-mixing 1.5 parts by weight of PB (same as above) at 50 ° C., polyoxyethylene alkylamino ether as an emulsion stabilizer: ADJ-4 (manufactured by Takemoto Yushi Co., Ltd.) 1.5
Parts by weight, polyoxyethylene arylphenyl ether phosphate ester salt: 1 part by weight of Newcargen FS-3 (registered trademark of Takemoto Yushi Co., Ltd.), 2 parts by weight of oleyl alcohol, and 6 parts by weight of ethylene glycol, 36 parts by weight of water. The solution dissolved in was gradually added with stirring to obtain 100 parts by weight of an aqueous emulsion, and the mixture was stirred at 10,000 rpm for 10 minutes. The resulting aqueous emulsion had the following properties. -Average particle size: 2.2 μm-Viscosity: 294 mPa-s-Storage stability: A stable aqueous emulsion form was retained under each of the storage conditions. Crystal precipitation: Crystal precipitation of the herbicide active ingredient was not observed under each of the above storage conditions.

[Example 6] 12.5 parts by weight of pyributicarb and Solvesso 200 (same as above) 39.5 as an organic solvent
3 parts by weight of polyoxyethylene / polyoxypropylene block polymer, polyoxyethylene styryl phenyl ether sulfate ester mixture: SORPOL 7695E (registered trademark of Toho Chemical Industry Co., Ltd.) at 50 ° C. as parts by weight, emulsifier and emulsion stabilizer. After being melt-mixed with, a polyalkylene glycol ether derivative of polyethylene polyamine as an emulsion stabilizer: 5 parts by weight of Newcargen D3020 (registered trademark of Takemoto Yushi Co., Ltd.), 5 parts by weight of decyl alcohol and 6 parts by weight of ethylene glycol are added to water. To a solution dissolved in 29 parts by weight is gradually added with stirring to obtain 100 parts by weight of an aqueous emulsion.
Stirred at pm for 10 minutes. The resulting aqueous emulsion had the following properties. -Average particle diameter: 6.6 m-Viscosity: 293 mPa-s-Storage stability: A stable aqueous emulsion form was retained under each of the storage conditions. Crystal precipitation: Crystal precipitation of the herbicide active ingredient was not observed under each of the above storage conditions.

[Example 7] 10.0 parts by weight of pyributicarb and Solvesso 200 (same as above) 39.5 as an organic solvent
Parts by weight, polyoxyethylene / polyoxypropylene block polymer as an emulsifier: Newkalgen 5050
After melt-mixing 1.5 parts by weight of PB (same as above) at 50 ° C., polyoxyethylene alkylamino ether as an emulsion stabilizer: ADJ-4 (same as above) 1.5 parts by weight, polyoxyethylene arylphenyl ether phosphorus Acid esterified salt: Aqueous emulsion obtained by gradually adding 1 part by weight of Newcalgen FS-3 (same as above), 2 parts by weight of oleyl alcohol and 6 parts by weight of ethylene glycol to 38.5 parts by weight of water while stirring, and stirring. Obtain 100 parts by weight, 10
The mixture was stirred at 000 rpm for 10 minutes. The resulting aqueous emulsion had the following properties. -Average particle size: 1.3 μm-Viscosity: 154 mPa-s-Storage stability: A stable aqueous emulsion form was retained under each of the storage conditions. Crystal precipitation: Crystal precipitation of the herbicide active ingredient was not observed under each of the above storage conditions.

[Example 8] 13.0 parts by weight of pyributicarb and Solvesso 200 (same as above) 39.5 as an organic solvent
Parts by weight, polyoxyethylene / polyoxypropylene block polymer monooleate as emulsifier: Brian P-3035-OL (registered trademark of Matsumoto Yushi Co., Ltd.) 1.5
After melt-mixing 1 part by weight at 50 ° C., 1 part by weight of polyoxyethylene arylphenyl ether phosphate ester salt: Newkalgen FS-3 (same as above) as an emulsifier, polyoxyethylene alkylamino ether: ADJ-4
(Same as above) 1.5 parts by weight, 2 parts by weight of oleyl alcohol and 6 parts by weight of ethylene glycol were dissolved in 35.5 parts by weight of water and gradually added with stirring to obtain 100 parts by weight of aqueous emulsion, 10,000 rpm. It was stirred for 10 minutes. The resulting aqueous emulsion had the following properties.・ Average particle size 0.8 μm ・ Viscosity: 242 mPa · s ・ Storage stability: A stable aqueous emulsion form was retained under each of the storage conditions. Crystal precipitation: Crystal precipitation of the herbicide active ingredient was not observed under each of the above storage conditions.

[Example 9] 8.0 parts by weight of pyributycarb and Solvesso 200 (same as above) 39.5 as an organic solvent
Parts by weight, polyoxyethylene / polyoxypropylene block polymer as an emulsifier: Newkalgen 5050
After melt-mixing 2.5 parts by weight of PB (same as above) at 50 ° C., 1.5 parts by weight of polyoxyethylene alkylamino ether as an emulsion stabilizer: ADJ-4 (same as above), 2 parts by weight of oleyl alcohol and ethylene. To a solution prepared by dissolving 6 parts by weight of glycol in 40.5 parts by weight of water was added gradually with stirring to obtain 100 parts by weight of an aqueous emulsion.
Stir at 0 rpm for 10 minutes. The resulting aqueous emulsion had the following properties.・ Average particle size: 0.7 μm ・ Viscosity: 87 mPa · s ・ Storage stability: A stable aqueous emulsion form was retained under each of the storage conditions. Crystal precipitation: Crystal precipitation of the herbicide active ingredient was not observed under each of the above storage conditions.

[Example 10] 12.5 parts by weight of pyributicarb, Solvesso 200 (same as above) as an organic solvent 39.
5 parts by weight, polyoxyethylene / polyoxypropylene block polymer as an emulsifier: Newkalgen 505
After melt-mixing 2.0 parts by weight of 0PB (same as above) at 50 ° C., polyoxyethylene arylphenyl ether phosphate ester salt as a emulsion stabilizer: Newkalgen F
S-3 (same as above) 0.5 parts by weight, decyl alcohol 4 parts by weight, silicone glycol: Dow Corning X2-530
9 (same as above) 4 parts by weight and 6 parts by weight of ethylene glycol were dissolved in 31.5 parts by weight of water and gradually added with stirring to obtain 100 parts by weight of an aqueous emulsion.
Stir at rpm for 10 minutes. The resulting aqueous emulsion had the following properties. -Average particle diameter: 0.8 μm-Viscosity: 414 mPa-s-Storage stability: A stable aqueous emulsion form was retained under each of the storage conditions. Crystal precipitation: Crystal precipitation of the herbicide active ingredient was not observed under each of the above storage conditions.

[Comparative Example 1] 12.5 parts by weight of pyributicarb and Solvesso 200 (same as above) 39.5 as an organic solvent.
Parts by weight, polyoxyethylene / polyoxypropylene block polymer as an emulsifier: Newkalgen 5050
After 4 parts by weight of PB (same as above) were melt-mixed at 50 ° C., 5 parts by weight of ethylene glycol was dissolved in 39 parts by weight of water and gradually added to the solution with stirring to obtain an aqueous emulsion 100.
A part by weight was obtained and stirred at 10,000 rpm for 10 minutes.
The resulting aqueous emulsion had the following properties. -Average particle size: 1.8 μm-Viscosity: 196 mPa-s-Storage stability: A stable aqueous emulsion form was retained under each of the storage conditions. The layers were separated under each storage condition of. Crystal precipitation: Crystal precipitation of the herbicide active ingredient was not observed under each of the above storage conditions.

[Comparative Example 2] 12.5 parts by weight of pyributicarb and Solvesso 200 (same as above) 39.5 as an organic solvent.
By weight, 5 parts by weight of polyoxyethylene tristyryl phenyl ether: SOPLOPHOR BSU (same as above) as an emulsifier were melt-mixed at 50 ° C., and then 5 parts by weight of ethylene glycol were dissolved in 38 parts by weight of water and gradually stirred. To obtain 100 parts by weight of an aqueous emulsion, and the mixture was stirred at 10,000 rpm for 10 minutes. The resulting aqueous emulsion had the following properties. -Average particle size: 1.9 μm-Viscosity: 71 mPa-s-Storage stability: A stable aqueous emulsion form was retained under each of the storage conditions. The layers were separated under each storage condition of. Crystal precipitation: Crystal precipitation of the herbicide active ingredient was not observed under each of the above storage conditions.

[Comparative Example 3] 12.5 parts by weight of pyributycarb and Solvesso 200 (same as above) 39.5 as an organic solvent.
5 parts by weight of polyoxyethylene castor oil ether: Newcalgen D-230 (registered trademark of Takemoto Yushi Co., Ltd.) as an emulsifier was melt mixed at 50 ° C., and then 5 parts by weight of ethylene glycol was added to 38 parts by weight of water. The solution was gradually added to the dissolved solution under stirring to obtain 100 parts by weight of an aqueous emulsion, and stirred at 10,000 rpm for 10 minutes. The resulting aqueous emulsion had the following properties. -Average particle size: 2.4 μm-Viscosity: 184 mPa-s-Storage stability: The layers were separated under each of the storage conditions. -Crystal precipitation: Crystal precipitation of the herbicide active ingredient was observed under each of the above storage conditions.

[Comparative Example 4] 12.5 parts by weight of pyributycarb and Solvesso 200 (same as above) 39.5 as an organic solvent.
By weight, as an emulsifier, polyoxyethylene styryl phenyl ether phosphate ester salt: SORPOL767
5 parts by weight of 8 (registered trademark of Toho Chemical Industry Co., Ltd.) were melt mixed at 50 ° C., and then 6 parts by weight of ethylene glycol were added to water 3 parts.
The solution dissolved in 7 parts by weight was gradually added with stirring to obtain 100 parts by weight of an aqueous emulsion, and the mixture was stirred at 10,000 rpm for 10 minutes. The resulting aqueous emulsion had the following properties.・ Average particle size: 8.4 μm ・ Viscosity: 71 mPa · s ・ Storage stability: The layers were separated under each of the storage conditions. -Crystal precipitation: Crystal precipitation of the herbicide active ingredient was observed under each of the above storage conditions.

[Comparative Example 5] 10.0 parts by weight of pyributycarb and Solvesso 200 (same as above) 39.5 as an organic solvent.
5 parts by weight of polyoxyalkylene aryl phenyl ether: Newcalgen FS-1 (registered trademark of Takemoto Yushi Co., Ltd.) as an emulsifier was melt-mixed at 50 ° C., and then 6 parts by weight of ethylene glycol was added 39.5 parts by weight of water. The solution dissolved in 1 part was gradually added with stirring to obtain 100 parts by weight of an aqueous emulsion, and the mixture was stirred at 10,000 rpm for 10 minutes. The resulting aqueous emulsion had the following properties.・ Average particle size: 2.8 μm ・ Viscosity: 186 mPa · s ・ Storage stability: The layers were separated under each of the storage conditions. -Crystal precipitation: Crystal precipitation of the herbicide active ingredient was observed under each of the above storage conditions.

[0037]

Since the herbicidal composition of the present invention is extremely excellent in storage stability, the herbicidal active ingredient and the like are separated, precipitated, and crystal-grown even under long-term storage or under severe temperature changes. Moreover, it is highly safe for the environment and users.

Claims (3)

[Claims] 1. (a) O-3- as an active ingredient of a herbicide
tert-butylphenyl-6-methoxy-2-pyridyl (methyl) thiocarbamate, (b) emulsifier selected from the group consisting of polyoxyethylene tristyryl phenyl ether, polyoxyethylene / polyoxypropylene block polymer or derivative thereof. Done 1
(C) as an emulsion stabilizer, polyoxyethylene alkylamino ether, silicon glycol, polyalkylene glycol ether of polyethylene polyamine, polyoxyethylene arylphenyl ether phosphate ester salt, polyoxyethylene arylphenyl ether One or more surfactants selected from the group consisting of sulfated salts and higher alcohols,
(D) As an organic solvent, an aromatic compound, and (e)
A herbicidal composition in the form of an aqueous emulsion, which comprises water. 2. A herbicide active ingredient (a) in an amount of 1 to 20% by weight,
1 to 15% by weight of the emulsifier (b), 0.5 to 10% by weight of the emulsion stabilizer (c), 3 to 60% by weight of the organic solvent (d), and 10 to 90% by weight of water (e). The herbicidal composition according to claim 1, which comprises: 3. The organic solvent (d) has a distillation temperature of 160 to 3
The herbicidal composition according to any one of claims 1 to 3, which is an aromatic compound in the range of 30 ° C.